Initial commit

Blog3000.sln

@@ -0,0 +1,37 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30011.22
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Blog3000.Shared", "Blog3000\Shared\Blog3000.Shared.csproj", "{63465B40-6DB2-4AD4-87FD-E36285CBA87B}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Blog3000.Server", "Blog3000\Server\Blog3000.Server.csproj", "{BE0FC579-82AD-4E9D-A417-BE093F05CB50}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Blog3000.Client", "Blog3000\Client\Blog3000.Client.csproj", "{3BD237CB-928A-4611-8B00-0EBD0A79E9A0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{63465B40-6DB2-4AD4-87FD-E36285CBA87B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{63465B40-6DB2-4AD4-87FD-E36285CBA87B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{63465B40-6DB2-4AD4-87FD-E36285CBA87B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{63465B40-6DB2-4AD4-87FD-E36285CBA87B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BE0FC579-82AD-4E9D-A417-BE093F05CB50}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BE0FC579-82AD-4E9D-A417-BE093F05CB50}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BE0FC579-82AD-4E9D-A417-BE093F05CB50}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BE0FC579-82AD-4E9D-A417-BE093F05CB50}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3BD237CB-928A-4611-8B00-0EBD0A79E9A0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3BD237CB-928A-4611-8B00-0EBD0A79E9A0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3BD237CB-928A-4611-8B00-0EBD0A79E9A0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3BD237CB-928A-4611-8B00-0EBD0A79E9A0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {585CF7CC-6E5D-44AA-8DA1-E10C11A8479D}
+	EndGlobalSection
+EndGlobal

Blog3000/Client/App.razor

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+<Router AppAssembly="@typeof(Program).Assembly">
+    <Found Context="routeData">        
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+    </Found>
+    <NotFound>
+        <LayoutView Layout="@typeof(MainLayout)">
+            <p>Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>

Blog3000/Client/Blog3000.Client.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <RazorLangVersion>3.0</RazorLangVersion>
+    <ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
+    <AssemblyVersion>1.0.0.0</AssemblyVersion>
+    <PackageId>Blog3000.Client</PackageId>
+    <Authors>Blog3000.Client</Authors>
+    <Product>Blog3000.Client</Product>
+	
+	<ServiceWorkerCacheVersion>1</ServiceWorkerCacheVersion>
+	<ServiceWorkerForce>true</ServiceWorkerForce>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Resources\**" />
+    <Content Remove="Resources\**" />
+    <EmbeddedResource Remove="Resources\**" />
+    <None Remove="Resources\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="Services\BlogDb.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Blazored.LocalStorage" Version="3.0.0" />
+    <PackageReference Include="Markdig" Version="0.20.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="3.2.1" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Build" Version="3.2.1" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="3.2.1" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.AspNetCore.Blazor.HttpClient" Version="3.2.0-preview2.20160.5" />
+    <PackageReference Include="System.Linq.Async" Version="4.1.1" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Shared\Blog3000.Shared.csproj" />
+  </ItemGroup>
+
+  <!-- When publishing, swap service-worker.published.js in place of service-worker.js -->
+  <ItemGroup Condition="'$(DesignTimeBuild)' != 'true'">
+    <Content Remove="wwwroot\service-worker.js" />
+    <Content Update="wwwroot\service-worker.published.js" Link="wwwroot\service-worker.js" />
+  </ItemGroup>
+  <Target Name="PreBuild" BeforeTargets="PreBuildEvent">
+    <Exec Command="cmd.exe /c echo namespace Blog3000.Client  { &gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;&#xD;&#xA;cmd.exe /c echo public static class BuildVersion { &gt;&gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;&#xD;&#xA;cmd.exe /c echo public static string BUILD_DATE=&quot;%25date%25 %25time%25&quot;; &gt;&gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;&#xD;&#xA;cmd.exe /c echo }  }&gt;&gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;" />
+  </Target>
+  <ProjectExtensions><VisualStudio><UserProperties wwwroot_4manifest_1json__JsonSchema="" /></VisualStudio></ProjectExtensions>
+
+</Project>

Blog3000/Client/Blog3000.Client.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <DebuggerFlavor>ProjectDebugger</DebuggerFlavor>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ActiveDebugProfile>Blog3000</ActiveDebugProfile>
+    <ShowAllFiles>false</ShowAllFiles>
+  </PropertyGroup>
+</Project>

Blog3000/Client/BuildVersion.cs

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+namespace Blog3000.Client  { 
+public static class BuildVersion { 
+public static string BUILD_DATE="03.10.2020 20:24:05,60"; 
+}  }

Blog3000/Client/MainConfig.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client
+{
+    public class MainConfig
+    {
+        public string Title { get; set; }
+
+        public string DefaultMailAddress { get; set; }
+
+        public string[] TopTopics { get; set; }
+
+        public Dictionary<string, string> SocialLinks { get; set; }
+    }
+}

Blog3000/Client/Pages/Counter.razor

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+@page "/counterXXXX"
+
+<h1>Counter</h1>
+
+<p>Current count: @currentCount</p>
+
+<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
+
+@code {
+    private int currentCount = 0;
+
+    private void IncrementCount()
+    {
+        currentCount++;
+    }
+}

Blog3000/Client/Pages/Index.razor

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+@page "/"
+@using Blog3000.Shared
+
+
+<PostFinder @ref="postFinder" />
+
+<div class="top-topics index-page">
+    <hr />
+    <TopTopics OnTopicClick="TopicClickHandler" />
+</div>
+
+
+<div class="topic-cloud index-page">
+    <hr />
+    <TopicCloud OnTopicClick="TopicClickHandler"/>
+</div>
+
+@code {
+
+
+}

Blog3000/Client/Pages/Index.razor.cs

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+
+
+using Microsoft.AspNetCore.Components;
+using Blog3000.Client.Shared;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Pages
+{
+    public partial class Index
+    {
+
+        [Parameter]
+        public int StartIdx {get;set ;}
+
+        private PostFinder postFinder;
+
+        protected override void OnInitialized()
+        {           
+         
+        }
+
+
+        private void TopicClickHandler(string topic)
+        {
+            //System.Diagnostics.Debug.WriteLine($"Got {topic} ");
+            postFinder.StartSearch(topic);
+        }
+
+
+    }
+}

Blog3000/Client/Pages/PublicDl.razor

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+@page "/PublicDl/{Filename}"
+@inject IJSRuntime jsRuntime
+
+ <div>
+     @if (FinalUrl == null) {
+        <h3>Preparing @Filename...</h3>
+     }
+     else
+     {
+         <h3>Downloading <a href="@FinalUrl">@Filename</a> ...</h3>
+     }
+ </div>
+
+
+
+    @code {
+
+      
+    }

Blog3000/Client/Pages/PublicDl.razor.cs

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+using Microsoft.AspNetCore.Components;
+using Microsoft.JSInterop;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Pages
+{
+    public partial class PublicDl
+    {
+
+        /* Download within the url-space the blog
+         * Authors can Download from /PublicDl/myfile
+         * Server will be asked for actual url and the
+         * and the download will be initiated from this url.
+         * Server may anonymously count downloads, or create
+         * one-time-urls for protected DLs.
+         * Download-counting could be readlized with <a href.... ping=myserver" as well
+         * 
+         * The download-server should have another domain than the blog currently,
+         * since otherwise the blogs router may take over and display a not found.
+         * 
+         * Otherwise we would need a own javascript based downloader, which may
+         * be excessive work currently
+         * 
+         */ 
+
+        [Parameter]
+        public string Filename
+        {
+            get; set;
+        }
+
+        public string FinalUrl;
+
+        [Inject]
+        private HttpClient HttpClient { get; set; }
+
+        protected override async Task OnInitializedAsync()
+        {
+            FinalUrl = await HttpClient.GetStringAsync($"PublicDl/{Filename}/getredirurl");
+            this.StateHasChanged();
+
+            await jsRuntime.InvokeVoidAsync("downloadURI", $"{FinalUrl}", ""); ;
+        }
+    }
+}

Blog3000/Client/Pages/Viewer.razor

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+@page "/viewer/{Id}"
+
+<html>
+<head>
+    <title>@CurrentPost?.Title</title>
+</head>
+<body>
+    <div class="viewer">
+        <h1>@CurrentPost?.Title&nbsp</h1>
+        @if (CurrentPost?.Abstract != null)
+        {
+            <hr />
+            <i>Abstract: @CurrentPost?.Abstract</i>
+            <hr />
+        }
+        @if (CurrentPost == null)
+        {
+            <p>@Status...</p>
+        }
+        else
+        {
+            <MarkdownViewer Markdown="@CurrentPost.Text" ImgRefRewriter="@imgRefRewriter" />
+        }
+        <hr />
+        @{
+            var x = CurrentPost?.Revisions?.LastOrDefault();
+            var ca = x?.ChangedAt.ToString() ?? "Unknown";
+        }
+    <div>
+        @if (@viewCount > 25)
+        {
+            <span>Last update: @ca UTC by @x?.Author (@x?.Description), ~@viewCount view(s)</span>
+        }
+        else
+        {
+            <span>Last update: @ca UTC by @x?.Author (@x?.Description)</span>
+        }
+    </div>
+    </div>
+</body>
+</html>
+
+@code {
+
+}

Blog3000/Client/Pages/Viewer.razor.cs

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+using Microsoft.AspNetCore.Components;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Pages
+{
+    public partial class Viewer: IDisposable
+    {
+
+       
+
+        [Parameter]
+        public string Id
+        {
+            get { return _id; }
+            set
+            {
+                if (_id != value)
+                {
+                    _id = value;
+                    idChanged?.Invoke(this, EventArgs.Empty);
+                }
+            }
+        }
+        private string _id;
+
+        [Inject]
+        private BlogDb BlogDb { get; set; }
+
+
+        [Inject]
+        private ViewStats ViewStats { get; set; }
+
+        private BlogPost CurrentPost { get; set; }
+
+        private string Status { get; set; }
+
+        private int viewCount = 0;
+
+        private event EventHandler idChanged;
+
+        private Shared.MarkdownViewer.ImgRefRewriterDelegate imgRefRewriter;
+
+
+        public void Dispose()
+        {
+            idChanged -= Viewer_idChanged;
+        }
+
+
+        protected override async Task OnInitializedAsync()
+        {
+            await RefreshData();
+            idChanged += Viewer_idChanged;
+        }
+
+
+        private async void Viewer_idChanged(object sender, EventArgs e)
+        {
+            await RefreshData();
+            this.StateHasChanged();
+        }
+
+        private async Task RefreshData() { 
+            imgRefRewriter = (a, b) => {
+                System.Diagnostics.Debug.WriteLine($"Rewrting {a}/{b}");
+                try
+                {
+                    //var s = blogDb.FetchImage(Id, a);
+                    //return "data:image/jpeg;base64, " + s;
+                    return $"BlogPosts/{Id}/imgref/{a}";
+                }
+                catch(IOException ex)
+                {
+                    System.Diagnostics.Debug.WriteLine($"Error rewriting url {a}/{b}", ex);
+                }
+                return "";
+              };
+
+            Status = "Loading...";
+            var (post, res) = await BlogDb.GetCachedPostAsync(Id, true, true);
+            
+            if (res == BlogDb.FetchStatus.OK)
+            {
+                try
+                {
+                    viewCount = await ViewStats.GetPostViewCount(Id);
+                }
+                catch(Exception ex)
+                {
+                    System.Diagnostics.Debug.WriteLine($"Can't get viewCount: ${ex.ToString()}");
+                    viewCount = -1;
+
+                }
+
+                _ = ViewStats.AddPostView(Id);
+
+                CurrentPost = post;
+                Status = "";
+            }
+            else
+            {
+                CurrentPost = null;
+                Status = res switch
+                {
+                    BlogDb.FetchStatus.NotFound => "Not found",
+                    BlogDb.FetchStatus.NetError => "network error",
+                    BlogDb.FetchStatus.Offline => "not cached local and network offline",
+                    _ => "Unknown error"
+                };
+                Status = "Cannot view requested document: " + Status;               
+            }            
+        }
+
+ 
+    }
+}

Blog3000/Client/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using System.Text;
+using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+using Blazored.LocalStorage;
+using Ganss.XSS;
+using Blog3000.Client.Services;
+using System.Net.Http;
+
+namespace Blog3000.Client
+{
+    public class Program
+    {
+        public static async Task Main(string[] args)
+        {
+            var builder = WebAssemblyHostBuilder.CreateDefault(args);
+            builder.RootComponents.Add<App>("app");            
+            
+            builder.Services.AddScoped<HttpClient, HttpClient>(x => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
+            builder.Services.AddBlazoredLocalStorage();
+            
+            builder.Services.AddScoped<IHtmlSanitizer, HtmlSanitizer>(x =>
+            {
+                var s = new HtmlSanitizer();
+                s.AllowedAttributes.Add("class");                
+                return s;
+            });
+
+            builder.Services.AddScoped<NetworkStatus>();
+            builder.Services.AddScoped<ImgCacheStorage>();
+            builder.Services.AddScoped<Config>();            
+            builder.Services.AddScoped<BlogDb>();
+            builder.Services.AddScoped<ViewStats>();
+            
+
+            await builder.Build().RunAsync();
+        }
+    }
+}

Blog3000/Client/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:57461",
+      "sslPort": 44396
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Blog3000": {
+      "commandName": "Project",
+      "commandLineArgs": "--allow-search-devbot --visible-url-prefix=https://localhost:5001 --public-dl-uri=https://cdn.mh3000.net/blogdl",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "https://localhost:5001;http://localhost:5000"
+    }
+  }
+}

Blog3000/Client/Services/BlogDb.cs

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+using Microsoft.AspNetCore.Components;
+using Blazored.LocalStorage;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Net.Http;
+using Markdig.Extensions.Tables;
+using Blog3000.Client.Services;
+using System.Security.Cryptography;
+using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Blog3000.Client
+{
+    /// <summary>
+    /// TODO: Add all localStorage Ops regarding BlogsPosts here
+    /// - Updater
+    /// - Topic-Fetcher
+    /// - ...
+    /// </summary>
+    public class BlogDb: IDisposable
+    {        
+        public static string DBKEY_PREFIX_HDR = "blogdbhdr-";
+        public static string DBKEY_PREFIX_CONF = "blogdbconf-";
+        public static string DBKEY_PREFIX_BLOGCACHE = "blogcache-";
+        public static string DBKEY_PREFIX_IMGCACHE = "imgcached-";
+
+        public event EventHandler BlogPostsChanged;
+
+        private readonly ILocalStorageService localStorage;
+        private readonly ISyncLocalStorageService syncLocalStorage;
+        private readonly NetworkStatus networkStatus;
+        private readonly HttpClient httpClient;
+        private readonly ImgCacheStorage cache;
+
+
+
+        public BlogDb(ILocalStorageService ls, ISyncLocalStorageService sls, ImgCacheStorage cache, NetworkStatus ns, HttpClient http)
+        {
+            this.localStorage = ls;
+            this.syncLocalStorage = sls;
+            this.networkStatus = ns;
+            this.cache = cache;
+            this.httpClient = http;
+
+            localStorage.Changed += LocalStorage_Changed;
+        }
+
+        
+        public void Dispose()
+        {
+            localStorage.Changed -= LocalStorage_Changed;
+        }
+
+
+        public enum FetchStatus
+        {
+            OK,
+            NotFound,
+            NetError,
+            Offline
+        }
+
+        
+
+        private bool? _isEagerLoading = null;
+
+        public async Task<bool> IsEagerLoading()
+        {
+            if (_isEagerLoading != null) return _isEagerLoading == true;
+            _isEagerLoading = await localStorage.GetItemAsync<bool?>($"{DBKEY_PREFIX_CONF}IsEagerLoading") == true;
+            return _isEagerLoading == true;
+        }
+
+
+        public void SetEagerLoading(bool enabled)
+        {
+            _isEagerLoading = enabled;
+            localStorage.SetItemAsync<bool?>($"{DBKEY_PREFIX_CONF}IsEagerLoading", enabled);
+        }
+
+
+        public async Task<bool> AreImagesCached(string postId)
+        {
+            var imgsLoaded = await localStorage.GetItemAsync<bool?>($"{DBKEY_PREFIX_IMGCACHE}{postId}");
+            
+            if (imgsLoaded != null && true == imgsLoaded)
+            {
+                // Seems to have loaded once, check if still in cache
+                var bh = await GetHeaderAsync(postId);
+                if (bh == null) return false; // Should not occur but in case                
+                if (bh.ImageRefs != null) {
+                    var urls = new List<string>();
+                    foreach (var img in bh.ImageRefs)
+                    {
+                        // Images are cached by their id                    
+                        var url = $"BlogPosts/{postId}/imgref/{img.Key}";
+                        urls.Add(url);                        
+                    }
+                    var s = await cache.AreCached(urls.ToArray());                    
+                    System.Diagnostics.Debug.WriteLine($"ImageCacheCheck: Found {s} for {postId}");
+                    // Not in cache (anymore)?
+                    if (!s) return false;
+                }
+                return true;
+            }
+            return false;
+        }
+
+
+
+        /// <summary>
+        /// Get headers of all posts available (previously copied to localStorage)
+        /// </summary>
+        /// <returns></returns>
+        public async IAsyncEnumerable<BlogPostHeader> GetHeadersAsync()
+        {
+            var res = await localStorage.GetItemAsync<List<BlogPostHeader>>(BlogDb.DBKEY_PREFIX_HDR + "remotePosts");
+            if (res != null)
+            {
+                foreach (var b in res)
+                {
+                    yield return b;
+                }
+            }
+        }
+
+
+        /// <summary>
+        /// Get a header of posts available (previously copied to localStorage)
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        public async Task<BlogPostHeader> GetHeaderAsync(string id)
+        {
+            if (id != null)
+            {
+                var res = await localStorage.GetItemAsync<List<BlogPostHeader>>(BlogDb.DBKEY_PREFIX_HDR + "remotePosts");
+                if (res != null)
+                {
+                    foreach (var b in res)
+                    {
+                        if (id.Equals(b.Id)) return b;
+                    }
+                }
+            }
+            return null;
+        }
+
+
+        /// <summary>
+        /// Get headers from locally cached posts
+        /// </summary>
+        /// <returns></returns>
+        public async IAsyncEnumerable<BlogPostHeader> GetHeadersFromCachedPostsAsync()
+        {
+            int n = await localStorage.LengthAsync();
+            for (int i = 0; i < n; i++)
+            {
+                var key = await localStorage.KeyAsync(i);
+                if (key != null && key.StartsWith(BlogDb.DBKEY_PREFIX_BLOGCACHE))
+                {
+                    var bpt = await localStorage.GetItemAsync<BlogPost>(key);
+                    if (bpt != null)
+                    {
+                        var bp = bpt.ToBlogPost();
+                        yield return bp;
+                    }
+                }
+            }
+        }
+
+
+
+
+        /// <summary>
+        /// Get a locally cached post. Optionally fetch images from remote.  Optionally fetch post from remote. 
+        /// </summary>
+        /// <param name="postId"></param>
+        /// <param name="tryCacheImgs"></param>
+        /// <param name="tryRemote">when true try loading uncached post, or in non-eager-loading mode refresh cached post, which has been changed TBD!! </param>
+        /// <returns></returns>
+        public async Task<(BlogPost, FetchStatus)> GetCachedPostAsync(string postId, bool tryCacheImgs, bool tryRemote = false)
+        {
+            var res = await localStorage.GetItemAsync<BlogPost>($"{DBKEY_PREFIX_BLOGCACHE}{postId}");
+            bool needsSync = false;
+
+            if (!(await IsEagerLoading()) && tryRemote && res != null && networkStatus.IsOnline /* makes no sense if offline */)
+            {
+                var bph = await GetHeaderAsync(postId);
+                if (bph != null)
+                {
+                    if (! String.Equals(bph.Checksum, res.Checksum))
+                    {
+                        // Invalidate the result 
+                        System.Diagnostics.Debug.WriteLine("Post has been changed, and not refresh via auto-eagerloading, so forceing sync");
+                        needsSync = true;
+                    }
+                }
+
+            }
+
+
+            if (!needsSync)
+            {
+                //
+                // This check is only needed, when the post is cached, since syncing
+                // includeds the images anyway if tryCacheImgs==true
+                //
+                var imgsLoaded = await AreImagesCached(postId);
+                if (!imgsLoaded && tryCacheImgs)
+                {
+                    if (networkStatus.IsOnline)
+                    {
+                        System.Diagnostics.Debug.WriteLine("Images not chached, forcing sync");
+                        needsSync = true;
+                    }
+                    else
+                    {
+                        System.Diagnostics.Debug.WriteLine("Images not chached, but offline, so not forcing sync");
+                    }
+                }
+            }
+
+            var status = FetchStatus.OK;
+
+            if (needsSync || res == null)
+            {
+                if (!tryRemote)
+                {
+                    status = FetchStatus.NotFound;
+                }
+                else
+                {
+                    var (sb, sres) = await SyncPost(postId, tryCacheImgs, false);
+                    switch (sres)
+                    {
+                        case SyncStatus.OK: res = sb; break;
+                        case SyncStatus.NetError: status = FetchStatus.NetError; break;
+                        case SyncStatus.Offline: status = FetchStatus.Offline; break;
+                        case SyncStatus.NotFound: status = FetchStatus.NotFound; break;
+                        default:
+                            throw new InvalidOperationException("unknown result");
+                    }
+
+                    if (status == FetchStatus.NotFound)
+                    {
+                        // When remote say not-found, ensure we won't handout cached data anymore
+                        res = null;
+                    }
+                    else if (status != FetchStatus.OK && res != null)
+                    {
+                        // We can use the cached version, so return a Offline-Status event in Net-Error-case
+                        status = FetchStatus.Offline; 
+                    }
+                }
+            }
+
+            return (res, status);
+        }
+
+
+        /// <summary>
+        /// Get locally cached posts withText
+        /// </summary>
+        /// <returns></returns>
+        public async IAsyncEnumerable<BlogPost> GetCachedPostsAsync()
+        {
+            int n = await localStorage.LengthAsync();
+            for (int i = 0; i < n; i++)
+            {
+                var key = await localStorage.KeyAsync(i);
+                if (key != null && key.StartsWith(BlogDb.DBKEY_PREFIX_BLOGCACHE))
+                {
+                    var bpt = await localStorage.GetItemAsync<BlogPost>(key);
+                    yield return bpt;                    
+                }
+            }
+        }
+
+
+        public enum SyncStatus
+        {
+            OK,
+            Offline,
+            NotFound,
+            NetError
+        }
+
+
+
+        /// <summary>
+        /// Sync a remote post with the local cache        
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="includeImgs"></param>
+        /// <param name="removeOld"></param>
+        /// <returns></returns>
+        public async Task<(BlogPost, SyncStatus)> SyncPost(string id, bool includeImgs, bool removeOld=true)
+        {
+            var status = SyncStatus.OK;
+            BlogPost res = null;
+
+            if (networkStatus.IsOnline)
+            {
+                try
+                {
+                    if (removeOld)
+                    {
+                        //var oldPost = await localStorage.GetItemAsync<BlogPostWithText>($"{DBKEY_PREFIX}{id}");
+                        //if (oldPost != null)
+                        //{
+
+                        //    if (oldPost.ImageRefs != null)
+                        //    {
+                        //        foreach (var k in oldPost.ImageRefs.Keys)
+                        //        {
+                        //            await localStorage.RemoveItemAsync($"{DBKEY_IMG_PREFIX}{id}-{k}");
+                        //        }
+                        //    }
+                        //}
+
+                        var urls = await cache.MatchAll($"BlogPosts/{id}/imgref");
+                        if (urls != null)
+                        {
+                            foreach (var u in urls)
+                            {
+                                await cache.Delete(u);
+                            }
+                        }
+                        await Task.Yield();
+                        await localStorage.RemoveItemAsync($"{DBKEY_PREFIX_IMGCACHE}{id}");
+                        await localStorage.RemoveItemAsync($"{DBKEY_PREFIX_BLOGCACHE}{id}");
+                    }
+
+                    System.Diagnostics.Debug.WriteLine($"Syncing post {id}");
+                    var newPost = await httpClient.GetJsonAsync<BlogPost>($"BlogPosts/{id}");
+                    await Task.Yield(); // Any effect after non-localhost-network-awaits?
+                    if (newPost != null)
+                    {                        
+                        if (includeImgs)
+                        {
+                            if ((newPost.ImageRefs?.Count ?? 0) > 0)
+                            {
+
+                                //foreach (var k in newPost.ImageRefs.Keys)
+                                //{
+                                //    try
+                                //    {
+                                //        System.Diagnostics.Debug.WriteLine($"Fetching {k} for {id}");
+                                //        var f = await httpClient.GetByteArrayAsync($"BlogPosts/{id}/imgref/{k}");
+                                //        await localStorage.SetItemAsync($"{BlogDb.DBKEY_IMG_PREFIX}{id}-{k}", f);
+                                //    }
+                                //    catch (HttpRequestException ex)
+                                //    {
+                                //        System.Diagnostics.Debug.WriteLine($"BlogPosts: error fetching img {ex.GetStatusCode()} from remote");
+                                //    }                                
+                                //}
+
+                                var urls = new List<string>();
+                                foreach (var k in newPost.ImageRefs.Keys)
+                                {
+                                    var u = $"BlogPosts/{id}/imgref/{k}";                                                                        
+                                    urls.Add(u);
+                                }
+                                System.Diagnostics.Debug.WriteLine($"BlogPosts: caching  {urls.Count} imgs from remote... ");
+                                await cache.AddAll(urls.ToArray());
+                                await Task.Yield();
+                                System.Diagnostics.Debug.WriteLine($".... done");
+                            }
+                            else
+                            {
+                                System.Diagnostics.Debug.WriteLine($"BlogPosts: no images to cache done");
+                            }                            
+                            await localStorage.SetItemAsync($"{BlogDb.DBKEY_PREFIX_IMGCACHE}{id}", true);                            
+                        }
+                       
+                        await localStorage.SetItemAsync(BlogDb.DBKEY_PREFIX_BLOGCACHE + id, newPost);
+                        System.Diagnostics.Debug.WriteLine($"BlogPosts: fetched {id} from remote");
+                        res= newPost;
+                    }
+                    else
+                    {
+                        status = SyncStatus.NotFound;
+                    }
+                }
+                catch (HttpRequestException ex)
+                {
+                    System.Diagnostics.Debug.WriteLine($"BlogPosts: error fetching {ex.GetStatusCode()} from remote");
+                    // TODO: Find better way to extract statuscode
+                    if (("" + ex.ToString()).Contains("404")) status = SyncStatus.NotFound;
+                    else status = SyncStatus.NetError;
+                }
+            }
+            else
+            {
+                status = SyncStatus.Offline;
+            }
+
+            return (res, status);
+        }
+
+
+        private void LocalStorage_Changed(object sender, ChangedEventArgs e)
+        {
+            // Notify if a cached posts were changed
+            if (e.Key.StartsWith(BlogDb.DBKEY_PREFIX_BLOGCACHE)) Task.Run(() => {
+                System.Diagnostics.Debug.WriteLine("LocalStorage CachedPosts updated event -> emitting blogDbChanged Event");
+                BlogPostsChanged?.Invoke(this, EventArgs.Empty);
+            });
+
+
+            // Notify if header-list was changed
+            if (e.Key.StartsWith(BlogDb.DBKEY_PREFIX_HDR)) Task.Run(() =>
+            {
+                System.Diagnostics.Debug.WriteLine("LocalStorage Headers updated event -> emitting blogDbChanged Event");
+                BlogPostsChanged?.Invoke(this, EventArgs.Empty);
+            });
+
+        }
+
+    }
+
+
+
+
+
+}

Blog3000/Client/Services/CacheStorage.cs

@@ -0,0 +1,92 @@
+using Microsoft.JSInterop;
+using Blog3000.Client.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client
+{
+    public abstract class CacheStorage
+    {        
+        private readonly string cacheId;
+        private readonly IJSRuntime jsRuntime;
+        private Task<bool> initedTask;
+
+
+        public CacheStorage(IJSRuntime jsRuntime)
+        {
+            this.jsRuntime = jsRuntime;
+            this.cacheId = GetCacheId();
+
+            initedTask = jsRuntime.InvokePromise<bool>($"MyCacheStorage.Create", new object[] { cacheId });
+            System.Diagnostics.Debug.WriteLine("CacheStorage init started");
+        }
+
+
+        public async Task Add(string url)
+        {
+            try
+            {                
+                await initedTask;
+                await Task.Yield(); // Migitate 'Entry not found' problem?
+                await jsRuntime.InvokePromiseAsync<bool>($"{cacheId}.Add", url);
+                System.Diagnostics.Debug.WriteLine("Cache.Add done");
+            }
+            catch(Exception ex)
+            {
+                if (!ex.ToString().Contains("Entry was not found"))
+                {
+                    throw ex;
+                }
+                else System.Diagnostics.Debug.WriteLine("Cache.Add: Ignoring Entry not found problem!");
+            }
+        }
+
+
+        public async Task AddAll(string[] urls)
+        {
+            // Work around bug in edge erroreneuosly reporting "Entry was not found" sometimge
+            // although successful, Therefore we must request each file single
+                        
+            foreach (var u in urls)
+            {
+                await Task.Yield();
+                await Add(u);             
+            }
+            
+            //await Task.Yield();
+            //await jsRuntime.InvokePromiseAsync<bool>($"{cacheId}.AddAll", urls);
+            //System.Diagnostics.Debug.WriteLine("Cache.AddAll done");
+
+        }
+
+
+        public async Task Delete(string url)
+        {
+            await initedTask;
+            await jsRuntime.InvokePromiseAsync<bool>($"{cacheId}.Delete", url);
+            System.Diagnostics.Debug.WriteLine("Cache.Delete done");
+        }
+
+
+        public async Task<bool> AreCached(string[] filters)
+        {
+            await initedTask;
+            var res = await jsRuntime.InvokePromiseAsync<bool>($"{cacheId}.AreCached", filters);
+            System.Diagnostics.Debug.WriteLine($"Cache.AreCached {res} done");
+            return res;
+        }
+
+        public async Task<string[]> MatchAll(string filter)
+        {
+            await initedTask;
+            var res = await jsRuntime.InvokePromiseAsync<string[]>($"{cacheId}.MatchAll", filter);
+            System.Diagnostics.Debug.WriteLine($"Cache.MatchAll {res?.Length ?? -1} done");
+            return res;
+        }
+
+        protected abstract string GetCacheId();
+
+    }
+}

Blog3000/Client/Services/Config.cs

@@ -0,0 +1,99 @@
+using Microsoft.AspNetCore.Components;
+using Blazored.LocalStorage;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Net.Http;
+using System.Text.Json;
+
+namespace Blog3000.Client
+{
+    
+    public class Config: IDisposable    
+    {
+        public static string DBKEY_PREFIX="config-";
+
+        public MainConfig Main { get; private set; }
+
+        public event EventHandler ConfigChanged;
+        
+        private readonly NetworkStatus networkStatus;
+        private readonly ILocalStorageService localStorage;
+        private readonly HttpClient httpClient;
+
+        private bool configLoadedOnce = false;
+
+        public Config(ILocalStorageService ls, NetworkStatus networkStatus, HttpClient http)
+        {
+            this.localStorage = ls;
+            this.networkStatus = networkStatus;
+            this.httpClient = http;
+
+         
+        }
+
+
+        public void Dispose()
+        {
+            networkStatus.StatusChanged -= NetworkStatus_StatusChanged;
+        }
+
+
+        public async Task FetchAsync()
+        {
+            var config = await localStorage.GetItemAsync<MainConfig>($"{DBKEY_PREFIX}main.json");
+            if (config == null)
+            {
+                await ReloadConfigFromRemote();
+            }
+            else
+            {
+                System.Diagnostics.Debug.WriteLine("Using cached config");
+                Main = config;                
+                ConfigChanged?.Invoke(this, EventArgs.Empty);
+                configLoadedOnce = false;
+                _ = ReloadConfigFromRemote();                
+            }
+
+            if (Main == null) throw new Exception("Can't load config");            
+        }
+
+
+
+        private void NetworkStatus_StatusChanged(object sender, EventArgs e)
+        {
+            if (!configLoadedOnce && networkStatus.IsOnline)
+            {
+                // Ensure config will be reloaded event when started offline!
+                _ = ReloadConfigFromRemote();
+            }
+        }
+
+
+        private async Task ReloadConfigFromRemote()
+        {
+            if (networkStatus.IsOnline)
+            {
+                var json = await httpClient.GetStringAsync("config.json?" + DateTime.Now.Ticks);
+                //Log += json;
+                if (String.IsNullOrEmpty(json)) throw new Exception("Can't load config from server");
+                
+                var res = System.Text.Json.JsonSerializer.Deserialize<MainConfig>(json, new JsonSerializerOptions() { PropertyNameCaseInsensitive = true });
+                await localStorage.SetItemAsync($"{DBKEY_PREFIX}main.json", res);
+                Main = res;
+                configLoadedOnce = true;
+                ConfigChanged?.Invoke(this, EventArgs.Empty);
+                System.Diagnostics.Debug.WriteLine($"Config reloaded from server");
+                //System.Diagnostics.Debug.WriteLine(res.Title);
+            }
+            else
+            {
+                System.Diagnostics.Debug.WriteLine("Config not reloading, offline");
+            }
+        }
+
+      
+    }
+}

Blog3000/Client/Services/ImgCacheStorage.cs

@@ -0,0 +1,16 @@
+using Microsoft.JSInterop;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Transactions;
+
+namespace Blog3000.Client.Services
+{
+    public class ImgCacheStorage : CacheStorage
+    {      
+        public ImgCacheStorage(IJSRuntime j) : base(j) { }
+
+        protected override string GetCacheId() => "ImgCache";        
+    }
+}

Blog3000/Client/Services/NetworkStatus.cs

@@ -0,0 +1,32 @@
+using Microsoft.JSInterop;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client
+{
+    public class NetworkStatus
+    {
+        public event EventHandler StatusChanged;
+
+
+        public NetworkStatus(IJSRuntime jsRuntime)
+            => jsRuntime.InvokeVoidAsync("Network.Init", DotNetObjectReference.Create(this));
+
+
+        [JSInvokable("Network.StatusChanged")]
+        public void OnStatusChanged(bool isOnline)
+        {
+            if (IsOnline != isOnline)
+            {
+                System.Diagnostics.Debug.WriteLine($"New net state ${isOnline}");
+                IsOnline = isOnline;
+                StatusChanged ?.Invoke(this,EventArgs.Empty);
+            }
+        }
+
+
+        public bool IsOnline { get; protected set; } = true;
+    }
+}

Blog3000/Client/Services/ViewStats.cs

@@ -0,0 +1,137 @@
+using Microsoft.AspNetCore.Components;
+using Blazored.LocalStorage;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Net.Http;
+using Markdig.Extensions.Tables;
+using Blog3000.Client.Services;
+using System.Security.Cryptography;
+using System.ComponentModel;
+using System.Data;
+using System.Net.Security;
+
+namespace Blog3000.Client
+{
+    /// <summary>
+    /// TODO: Add all localStorage Ops regarding BlogsPosts here
+    /// - Updater
+    /// - Topic-Fetcher
+    /// - ...
+    /// </summary>
+    public class ViewStats : IDisposable
+    {
+        public static string DBKEY_PREFIX = "viewstats-";
+        
+        private readonly ILocalStorageService localStorage;
+        private readonly NetworkStatus networkStatus;
+        private readonly HttpClient httpClient;
+
+        public ViewStats(ILocalStorageService ls, NetworkStatus ns, HttpClient http)
+        {
+            this.localStorage = ls;
+            this.networkStatus = ns;
+            this.httpClient = http;
+
+            localStorage.Changed += LocalStorage_Changed;
+        }
+
+
+        public void Dispose()
+        {
+            localStorage.Changed -= LocalStorage_Changed;
+        }
+
+
+        public async Task AddPostView(string postId)
+        {
+            var unsentStats = await localStorage.GetItemAsync<Dictionary<string, int>>($"{DBKEY_PREFIX}local");
+            unsentStats ??= new Dictionary<string, int>();
+            unsentStats.Remove(postId);
+            unsentStats.Add(postId, 1);
+            await localStorage.SetItemAsync($"{DBKEY_PREFIX}local", unsentStats);
+            _ = SyncViewStats();
+        }
+
+        public async Task<int> GetPostViewCount(string postId)
+        {
+            var remoteStats = await localStorage.GetItemAsync<Dictionary<string, int>>($"{DBKEY_PREFIX}remote");
+            var unsentStats = await localStorage.GetItemAsync<Dictionary<string, int>>($"{DBKEY_PREFIX}local");
+
+            int remoteCount = 0;
+            remoteStats?.TryGetValue(postId, out remoteCount);
+            int localCount = 0;
+            unsentStats?.TryGetValue(postId, out localCount);
+
+            return localCount + remoteCount;
+        }
+
+        /// <summary>
+        /// Fetch a locally cached post. Optionally fetch images from remote.  Optionally fetch post from remote. 
+        /// </summary>
+        /// <param name="postId"></param>
+        /// <param name="tryCacheImgs"></param>
+        /// <param name="tryRemote"></param>
+        /// <returns></returns>
+        public async Task<bool> SyncViewStats()
+        {
+            if (!networkStatus.IsOnline)
+            {
+                System.Diagnostics.Debug.WriteLine("SyncViewStats: Offline, not syncing");
+                return false;
+            }
+
+            var unsentStats = await localStorage.GetItemAsync<Dictionary<string, int>>($"{DBKEY_PREFIX}local");
+            if ((unsentStats?.Count ?? 0) > 0)
+            {
+                try
+                {
+                    var newData = await httpClient.PostJsonAsync<Dictionary<string, int>>($"ViewStats", unsentStats);
+                    await localStorage.RemoveItemAsync($"{DBKEY_PREFIX}local");
+                    await localStorage.SetItemAsync<Dictionary<string, int>>($"{DBKEY_PREFIX}remote", newData);
+                    System.Diagnostics.Debug.WriteLine("SyncViewStats: Stats synced");
+                    return true;
+                }
+                catch (Exception ex)
+                {
+                    System.Diagnostics.Debug.WriteLine($"SyncViewStats: Sync failed: {ex.ToString()}");
+                }
+            }
+            else
+            {
+                System.Diagnostics.Debug.WriteLine("SyncViewStats: UnsetStats empty, not sending, only fetching");
+            }
+            
+            try
+            {
+                var newData = await httpClient.GetJsonAsync<Dictionary<string, int>>($"ViewStats");
+                await localStorage.SetItemAsync<Dictionary<string, int>>($"{DBKEY_PREFIX}remote", newData);
+                System.Diagnostics.Debug.WriteLine("SyncViewStats: Stats fetched");
+                return true;
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"SyncViewStats: Fetch failed: {ex.ToString()}");
+            }
+
+
+            return false;
+        }
+
+
+        private void LocalStorage_Changed(object sender, ChangedEventArgs e)
+        {
+            if (e.Key.StartsWith(ViewStats.DBKEY_PREFIX)) Task.Run(() => {  
+                //
+            });
+        }
+
+    }
+
+
+
+
+
+}

Blog3000/Client/Shared/MainLayout.razor

@@ -0,0 +1,78 @@
+@using Blog3000.Client.Shared
+@inherits LayoutComponentBase
+@implements IDisposable
+@inject Config CurrConfig
+@inject IJSRuntime JSRuntime 
+
+
+<div class="sidebar">
+    <NavMenu />
+</div>
+
+
+
+<div class="main">
+    <!-- div class="top-row px-4">
+        <a href="http://blazor.net" target="_blank" class="ml-md-auto">About</a>
+    </div-->
+    <div class="updater">
+        <span><Updater /></span>
+    </div>
+
+    <div class="content px-4">
+        @Body
+    </div>
+    <hr />
+
+    @if (defaultMailAddress != null)
+    {
+        <div class="blog-contact"><a href="@defaultMailAddress">@defaultMailAddressTxt</a></div>
+    }
+    <div class="blog-powered-by">Powered by blog3000 (C) M. Höß, Version 0.1 PreAlpha Build @build, powered by C#, ASP.NetCore, Blazor and Gentoo-Linux :)</div>
+
+</div>
+
+
+@code {
+
+    private string build;
+    private string defaultMailAddress;
+    private string defaultMailAddressTxt;
+
+    public void Dispose()
+    {
+        CurrConfig.ConfigChanged -= ConfigChanged;
+    }
+
+    protected override void OnInitialized()
+    {
+        build = Blog3000.Client.BuildVersion.BUILD_DATE;
+
+        CurrConfig.ConfigChanged += ConfigChanged;
+        _ = CurrConfig.FetchAsync();
+        Refresh();
+
+    }
+
+    private void ConfigChanged(object sender, EventArgs e)
+    {
+        Refresh();
+    }
+
+    private void Refresh()
+    {
+        defaultMailAddress = CurrConfig?.Main?.DefaultMailAddress != null ? $"mailto:{CurrConfig.Main.DefaultMailAddress}" : null;
+        defaultMailAddressTxt = CurrConfig?.Main?.DefaultMailAddress != null ? $"Send a comment to {CurrConfig.Main.DefaultMailAddress}" : null;
+
+        if (CurrConfig?.Main?.Title != null)
+        {
+            JSRuntime.InvokeVoidAsync("window.setTitle", CurrConfig.Main.Title);
+        }
+
+
+        StateHasChanged();
+    }
+
+}
+
+

Blog3000/Client/Shared/MarkdownViewer.razor

@@ -0,0 +1,17 @@
+
+
+@if (HtmlContent.Value == null)
+{
+    <span>Please wait while rendering...</span>
+}
+else
+{
+    <article class="markdown-body">
+        @HtmlContent
+    </article>
+}
+
+
+@code {
+
+}

Blog3000/Client/Shared/MarkdownViewer.razor.cs

@@ -0,0 +1,120 @@
+using Ganss.XSS;
+using Markdig;
+using Markdig.Syntax;
+using Microsoft.AspNetCore.Components;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Shared
+{
+    public partial class MarkdownViewer: IDisposable
+    {
+
+        public delegate string ImgRefRewriterDelegate(string imgKey, string currentUrl);
+        
+        [Parameter]
+        public string Markdown
+        {
+            get
+            {
+                return _markdown;
+            }
+            set
+            {
+                _markdown = value;
+                MarkdownChanged?.Invoke(this, EventArgs.Empty);
+            }
+        }
+
+        private string _markdown;
+        
+
+
+        [Parameter]
+        public ImgRefRewriterDelegate ImgRefRewriter{ get; set; }
+
+
+        [Inject]
+        private IHtmlSanitizer htmlSanitizer { get; set; }
+
+        private MarkupString HtmlContent { get; set; }
+
+        private event EventHandler MarkdownChanged;
+
+        public void Dispose()
+        {
+            MarkdownChanged -= MarkdownViewer_MarkdownChanged;
+        }
+
+        protected override async Task OnInitializedAsync()
+        {
+            await Task.Run(() =>
+            {
+               
+            });
+            HtmlContent = await FromMarkdown(Markdown);
+            MarkdownChanged += MarkdownViewer_MarkdownChanged;
+        }
+
+        private async void MarkdownViewer_MarkdownChanged(object sender, EventArgs e)
+        {
+            HtmlContent = await FromMarkdown(Markdown);
+            StateHasChanged();
+        }
+
+        private async Task<MarkupString> FromMarkdown(string markdown)
+        {
+            var mdPipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+
+            var mdoc = Markdig.Markdown.Parse(markdown, mdPipeline);
+
+
+            Dictionary<string, string> imgGeysByUrls = null;
+            if (ImgRefRewriter != null)
+            {
+                System.Diagnostics.Debug.WriteLine($"*** Rewriter active");
+                imgGeysByUrls ??= new Dictionary<string, string>();
+                foreach (var r in mdoc.GetLinkReferenceDefinitions().Links)
+                {
+                    System.Diagnostics.Debug.WriteLine($"Found {r.Key} => {r.Value.Url}");
+                    if (r.Value != null && r.Value.Url != null)
+                    {
+                        imgGeysByUrls.Add(r.Value.Url, r.Key);
+                    }
+                }
+            }
+
+            
+            //var html = Markdig.Markdown.ToHtml(markdown, mdPipeline);
+
+            var writer = new StringWriter();            
+            var renderer = new Markdig.Renderers.HtmlRenderer(writer);
+            if (ImgRefRewriter != null)
+            {
+                renderer.LinkRewriter += (a) =>
+                {                    
+                    string imgKey;
+                    if (imgGeysByUrls.TryGetValue(a, out imgKey))
+                    {
+                        return ImgRefRewriter(imgKey, a);                                               
+                    }
+                    return a;
+                };
+            }
+            mdPipeline.Setup(renderer);            
+            renderer.Render(mdoc);
+            var html = writer.ToString();
+            //System.Diagnostics.Debug.WriteLine(html);
+            html = htmlSanitizer.Sanitize(html);            
+            return new MarkupString(html);
+
+        }
+
+     
+    }   
+}

Blog3000/Client/Shared/NavMenu.razor

@@ -0,0 +1,66 @@
+@inject Config config
+
+<div class="top-row pl-4 navbar navbar-dark">
+    <a class="navbar-brand" href="">@{var t = config?.Main?.Title ?? "Blog3000 instance";}@t</a>
+
+    <div class="social-links">        
+        @if (config?.Main?.SocialLinks != null)
+        {
+            @foreach (var item in config.Main.SocialLinks)
+            {
+                <div class="social-link">
+                    <svg alt="More" width="1em" height="1em" viewBox="0 0 16 16" class="bi bi-arrow-right-short" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
+                        <path fill-rule="evenodd" d="M4 8a.5.5 0 0 1 .5-.5h5.793L8.146 5.354a.5.5 0 1 1 .708-.708l3 3a.5.5 0 0 1 0 .708l-3 3a.5.5 0 0 1-.708-.708L10.293 8.5H4.5A.5.5 0 0 1 4 8z" />
+                    </svg><a class=".btn-link" href="@item.Value">@item.Key</a>
+                </div>
+            }           
+        }
+    </div>
+
+    <button class="navbar-toggler" @onclick="ToggleNavMenu">
+        <span class="navbar-toggler-icon"></span>
+    </button>
+    </div>
+
+<div class="@NavMenuCssClass" @onclick="ToggleNavMenu">
+    <ul class="nav flex-column">
+        <li class="nav-item px-3">
+            <NavLink class="nav-link" href="" Match="NavLinkMatch.All">
+                <span class="oi oi-home" aria-hidden="true"></span> Home
+            </NavLink>
+        </li>
+        <StickyNavLinks />
+        <!-- li class="nav-item px-3">
+            <NavLink class="nav-link" href="/legal" Match="NavLinkMatch.All">
+                <span class="oi oi-eject" aria-hidden="true"></span>Impressum, DSGVO
+            </NavLink>
+        </li>
+        <li class="nav-item px-3">
+            <NavLink class="nav-link" href="fetchdata">
+                <span class="oi oi-list-rich" aria-hidden="true"></span> Fetch data
+            </NavLink>
+        </li -->
+
+    </ul>
+    
+</div>
+
+
+@code {
+
+    
+    protected override void OnInitialized() {
+        config.ConfigChanged += (s, e) => {
+            this.StateHasChanged();
+        };        
+    }
+
+    private bool collapseNavMenu = true;
+
+    private string NavMenuCssClass => collapseNavMenu ? "collapse" : null;
+
+    private void ToggleNavMenu()
+    {
+        collapseNavMenu = !collapseNavMenu;
+    }
+}

Blog3000/Client/Shared/PostFinder.razor

@@ -0,0 +1,62 @@
+@using Blog3000.Shared;
+
+
+    <div class="post-finder" >
+        <div class="searchbox"  @ref="ScrollAnchorElement">
+            <input type="text" id="SearchBox" class="form-control search" maxlength="32" @bind="SearchText" placeholder="Search...">
+            <button type="button" class="searchbut btn btn-primary oi oi-arrow-right" @onclick="UpdateSearch" title="Start search" />
+            <button type="button" class="searchbut btn btn-primary oi oi-x" @onclick="ClearSearch" title="Clear search" />
+
+        </div>
+
+
+        @if (errorMsg != null)
+        {
+            <div class="error-msg">@errorMsg</div>
+        }
+
+        <div class="section-title">Showing result for: "@dispMode"</div>
+        <div class="navbar">
+            <button type="button" alt="First" title="Goto first result" @onclick="GotoFirst" class="first btn btn-primary oi oi-media-step-backward"></button>
+            <button type="button" alt="Go back" title="Go back one page" @onclick="GotoPrev" class="second btn btn-primary oi oi-caret-left"></button>
+            <span class="showing">Showing @PageInfo</span>
+            <button type="button" alt="Next" title="Goto next page" @onclick="GotoNext" class="third btn btn-primary oi oi-caret-right"></button>
+        </div>
+        <ul>
+            @foreach (var b in selectedPosts)
+            {
+                var x = "viewer/" + @b.Id;
+
+                <li style="text-wrap: none">
+
+                    @{
+                        var r = b.Revisions?.Latest();
+                        var a = r?.Author ?? b.Author;
+                        var t = (r?.ChangedAt?.ToShortDateString() ?? "???")
+                                         + ", "
+                                         + (r?.ChangedAt?.ToShortTimeString() ?? "???");
+                    }
+
+                    <NavLink class="nav-link" href="@x">
+                        @b.Title
+                        <abstract>@b.Abstract</abstract>
+                        <small>(@a, @t UTC)</small>
+                    </NavLink>
+
+                </li>
+
+            }
+        </ul>
+        <div class="navbar">
+            <button type="button" alt="First" @onclick="GotoFirst" class="first btn btn-primary oi oi-media-step-backward"></button>
+            <button type="button" alt="Go back" @onclick="GotoPrev" class="second btn btn-primary oi oi-caret-left"></button>
+            <span class="showing">Showing @PageInfo</span>
+            <button type="button" alt="Next" @onclick="GotoNext" class="third btn btn-primary oi oi-caret-right"></button>
+        </div>
+    </div>
+
+
+
+@code {
+
+}

Blog3000/Client/Shared/PostFinder.razor.cs

@@ -0,0 +1,265 @@
+using Microsoft.AspNetCore.Components;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Net.Http;
+using Microsoft.JSInterop;
+
+namespace Blog3000.Client.Shared
+{
+    public partial class PostFinder : IDisposable
+    {
+
+        public class State
+        {
+            public int StartIdx;
+            public string Search;
+        }
+
+        /// <summary>
+        /// Could be use with dict/startIdKey for use on different pages
+        /// </summary>
+        private static State CurrentState = new State();
+
+
+
+        [Inject]
+        private BlogDb BlogDb { get; set; }
+
+        [Inject]
+        private NetworkStatus NetworkStatus { get; set; }
+
+        [Inject]
+        private HttpClient Http { get; set; }
+
+        [Inject]
+        private IJSRuntime JSRuntime { get; set; }
+
+        private string errorMsg { get; set; }
+        private string dispMode { get; set; }
+
+        private string PageInfo
+        {
+            get
+            {
+                var res = $"{StartIdx + 1}-{StartIdx + 0 + pageSize} ";
+                if (totalPostsFound != null)
+                {
+                    if (totalPostsFound == 1)
+                    {
+                        res += $"(of 1)";
+                    }
+                    else if (totalPostsFound > 1)
+                    {
+                        res += $"(of {totalPostsFound})";
+                    }
+                }
+                return res;
+            }
+        }
+
+        private ElementReference ScrollAnchorElement;
+
+        private string SearchText { get; set; }
+
+        private int StartIdx
+        {
+            get
+            {
+                return startIdx;
+            }
+            set
+            {
+                startIdx = value;
+                OnStartIdxChanged();
+            }
+        }
+        private int startIdx = 0;
+
+        private int pageSize = 6;
+
+        private int pageMaxSize = 6;
+
+        private int? totalPostsFound = null;
+
+        private List<BlogPostHeader> selectedPosts = new List<BlogPostHeader>();
+
+
+        public void Dispose()
+        {
+            BlogDb.BlogPostsChanged -= BlogDb_BlogPostsChanged;
+
+        }
+
+
+        public async void StartSearch(string searchString)
+        {
+            System.Diagnostics.Debug.WriteLine($"Got searchstring {searchString}");
+            SearchText = searchString;
+            //            await SelectPosts();
+            //            StateHasChanged();
+            UpdateSearch();
+        }
+
+        protected override async Task OnInitializedAsync()
+        {
+
+            StartIdx = CurrentState.StartIdx;
+            SearchText = CurrentState.Search;
+
+            BlogDb.BlogPostsChanged += BlogDb_BlogPostsChanged;
+
+            await SelectPosts();
+        }
+
+        private async void BlogDb_BlogPostsChanged(object sender, EventArgs e)
+        {
+            await SelectPosts();
+            this.StateHasChanged();
+        }
+
+        private void GotoFirst()
+        {
+            System.Diagnostics.Debug.WriteLine("Goto first");
+            StartIdx = 0;
+        }
+
+        private void GotoNext()
+        {
+            StartIdx += pageMaxSize;
+        }
+
+        private void GotoPrev()
+        {
+            StartIdx -= pageMaxSize;
+        }
+
+
+        private async void ClearSearch()
+        {
+            errorMsg = null;
+            SearchText = "";
+            startIdx = 0;
+            totalPostsFound = null;
+            await SelectPosts();
+            StateHasChanged();
+            CurrentState.StartIdx = StartIdx;
+            CurrentState.Search = "";
+        }
+
+        private async void UpdateSearch()
+        {
+            errorMsg = null;
+            startIdx = 0;
+            totalPostsFound = null;
+            await SelectPosts();
+            StateHasChanged();
+            CurrentState.StartIdx = StartIdx;
+            CurrentState.Search = SearchText;
+            _ =  JSRuntime.InvokeVoidAsync("scrollElmIntoView", ScrollAnchorElement);
+        }
+
+
+        private async void OnStartIdxChanged()
+        {
+            if (startIdx < 0) startIdx = 0;
+            await SelectPosts();
+            if (selectedPosts.Count == 0 && startIdx > 0)
+            {
+                // Too far, go back one page
+                StartIdx -= pageMaxSize;
+                await SelectPosts();
+
+                // Bad input? instruct DB to find last page
+                if (selectedPosts.Count == 0 && startIdx > 0)
+                {
+                    await SelectPosts(true);
+                }
+            }
+            StateHasChanged();
+            CurrentState.StartIdx = StartIdx;
+        }
+
+
+
+
+        private async Task SelectPosts(bool findLastPage = false)
+        {
+
+            bool fulltextIsLocallyAvail = await BlogDb.IsEagerLoading();
+            bool isOnline = NetworkStatus.IsOnline;
+
+            var bps = new BlogPostSearch(() => BlogDb.GetCachedPostsAsync(), () => BlogDb.GetHeadersAsync(), SearchText);
+
+            if (!bps.IsNonEmptyTerm)
+            {
+                dispMode = "Last posts";
+            }
+            else
+            {
+                // Brutal fulltext search.. Should be good for the first 100 articles or so...
+                dispMode = "Search";
+            }
+
+            if (!bps.IsNonEmptyTerm)
+            {
+                var res = await bps.ExecAsync(startIdx, pageMaxSize, findLastPage);
+                pageSize = res.Count;
+                totalPostsFound = await BlogDb.GetHeadersAsync()
+                    .Where(a => "PUBLIC".Equals(a.Access))
+                    .Where(p => (p.StickyMenuPos ?? -1) < 0)
+                    .CountAsync();
+
+                selectedPosts = res;
+            }
+            else
+            {
+                bool needsFullText = bps.RequiresFullText;
+             
+                if (!fulltextIsLocallyAvail && needsFullText)
+                {
+                    if (!isOnline)
+                    {
+                        errorMsg = "Offline, search not possible";
+                        return;
+                    }
+                    else
+                    {
+                        try
+                        {
+                            var url = $"/BlogPosts/search?searchTerm={System.Net.WebUtility.UrlEncode(SearchText)}&startIdx={startIdx}&pageMaxSize={pageMaxSize}&findLastPage={findLastPage}";
+                            var ids = await Http.GetJsonAsync<List<String>>(url);
+                            var res = new List<BlogPostHeader>();
+                            foreach (var id in ids)
+                            {
+                                var bp = await BlogDb.GetHeaderAsync(id);
+                                if (bp != null)
+                                {
+                                    res.Add(bp);
+                                }
+                                await Task.Yield();
+                            }
+                            pageSize = res.Count;
+                            selectedPosts = res;
+                        }
+                        catch (Exception ex)
+                        {
+                            System.Diagnostics.Debug.WriteLine($"Exception during search: {ex}");
+                            errorMsg = $"Error during search: {ex.Message}";
+                        }
+                    }
+                }
+                else
+                {
+                    var efetch = BlogDb.GetCachedPostsAsync();
+                    var res = await bps.ExecAsync(startIdx, pageMaxSize, findLastPage);
+                    pageSize = res.Count;
+                    selectedPosts = res;
+                }
+            }
+        }
+    }
+}
+

Blog3000/Client/Shared/StickyNavLinks.razor

@@ -0,0 +1,13 @@
+@using Blog3000.Shared;
+
+@foreach (var b in @selectedPosts)
+{
+    var x = "viewer/" + @b.Id;
+
+    <li class="nav-item px-3">
+        <NavLink class="nav-link" href="@x" Match="NavLinkMatch.All">
+            @b.Title
+        </NavLink>
+    </li>
+}
+

Blog3000/Client/Shared/StickyNavLinks.razor.cs

@@ -0,0 +1,50 @@
+using Microsoft.AspNetCore.Components;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Shared
+{
+    public partial class StickyNavLinks: IDisposable
+    {
+
+        [Inject]
+        private BlogDb BlogDb { get; set; }
+
+    
+        private List<BlogPostHeader> selectedPosts = new List<BlogPostHeader>();
+
+
+        public void Dispose()
+        {
+            BlogDb.BlogPostsChanged -= BlogDb_BlogPostsChanged;
+        }
+
+        private async void BlogDb_BlogPostsChanged(object sender, EventArgs e)
+        {
+            selectedPosts = await SelectPosts();
+            StateHasChanged();
+        }
+
+        protected override async Task OnInitializedAsync()
+        {
+            BlogDb.BlogPostsChanged += BlogDb_BlogPostsChanged;
+            selectedPosts = await SelectPosts();
+        }
+
+
+
+        private async Task<List<BlogPostHeader>> SelectPosts()
+        {
+            var r = await BlogDb.GetHeadersAsync()
+                .Where(c => (c.StickyMenuPos ?? -1) >= 0)
+                .OrderBy(c => c.StickyMenuPos)
+                .ToListAsync();
+                
+            
+            return r;
+        }
+    }
+}

Blog3000/Client/Shared/TopTopics.razor

@@ -0,0 +1,13 @@
+
+
+<h3 class="section-title">Top-Topics</h3>
+
+@foreach (var t in topics.OrderBy(c => c.DispId))
+{    
+    <TopicContent Topic="@t" Owner="@this"/>
+}
+
+
+@code {
+
+}

Blog3000/Client/Shared/TopTopics.razor.cs

@@ -0,0 +1,98 @@
+using Microsoft.AspNetCore.Components;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Shared
+{
+    public partial class TopTopics: IDisposable
+    {
+
+        [Parameter]
+        public EventCallback<string> OnTopicClick { get; set; }
+
+
+        [Inject]
+        private BlogDb BlogDb { get; set; }
+
+        [Inject]
+        private Config Config { get; set; }
+
+        public class Topic {
+            public string DispId;
+            public List<BlogPostHeader> Posts = new List<BlogPostHeader>();
+        }
+
+      
+        private List<Topic> topics = new List<Topic>();
+
+        public void Dispose()
+        {
+            BlogDb.BlogPostsChanged -= BlogDb_BlogPostsChanged;
+            Config.ConfigChanged -= Config_ConfigChanged;
+        }
+
+        protected override async Task OnInitializedAsync()
+        {
+            topics = await UpdateTopicsAsync();
+            BlogDb.BlogPostsChanged += BlogDb_BlogPostsChanged;
+            Config.ConfigChanged += Config_ConfigChanged; ;
+        }
+
+        
+        private async void BlogDb_BlogPostsChanged(object sender, EventArgs e)
+        {
+            await RefreshAsync();
+        }
+
+
+        private async void Config_ConfigChanged(object sender, EventArgs e)
+        {
+            await RefreshAsync();
+        }
+
+
+        private async Task RefreshAsync()
+        {
+            topics = new List<Topic>(); // Clear to force rebuild
+            StateHasChanged();
+            topics = await UpdateTopicsAsync();
+            StateHasChanged();
+        }
+
+
+        private async Task<List<Topic>> UpdateTopicsAsync()
+        {
+            var dict = new Dictionary<string, Topic>();
+
+            foreach (var bp in await BlogDb.GetHeadersAsync().ToListAsync()) /*FromCachedPosts*/
+            {
+                if (bp != null && bp.Topics != null)
+                {
+                    foreach (var t in bp.Topics)
+                    {                        
+                        foreach (var tt in Config?.Main?.TopTopics ?? new string[] { })
+                        {                     
+                            if (String.Equals(tt, t))
+                            {
+                                Topic tp;
+                                if (!dict.TryGetValue(t, out tp))
+                                {
+                                    tp = new Topic();
+                                    tp.DispId = t;
+                                    dict.Add(tp.DispId, tp);
+                                }
+                                tp.Posts.Add(bp);
+                            }
+                        }
+                    }
+                }
+            }
+
+            return new List<Topic>(dict.Values);
+        }
+
+    }
+}

Blog3000/Client/Shared/TopicCloud.razor

@@ -0,0 +1,11 @@
+<h3 class="section-title">Topic-Overview</h3>
+
+<div class="topic-cloud">
+@foreach (var t in topics)
+{
+    <span class="topic-items topic-quick-link" @onclick="@(e => TopicClicked(t.DispId))">
+       <span>@t.DispId</span><span>(@t.Count)</span>
+    </span>
+}
+</div>
+

Blog3000/Client/Shared/TopicCloud.razor.cs

@@ -0,0 +1,82 @@
+using Microsoft.AspNetCore.Components;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Shared
+{
+    public partial class TopicCloud: IDisposable
+    {
+        public class Topic
+        {
+            public string DispId;
+            public int Count;
+        }
+
+
+        [Inject]
+        private BlogDb BlogDb { get; set; }
+
+        private List<Topic> topics = new List<Topic>();
+
+
+        [Parameter]
+        public EventCallback<string> OnTopicClick { get; set; }
+
+        public void Dispose()
+        {
+            BlogDb.BlogPostsChanged -= BlogDb_BlogPostsChanged;
+        }
+
+
+        protected override async Task OnInitializedAsync()
+        {
+            topics = await UpdateTopicsAsync();
+            BlogDb.BlogPostsChanged += BlogDb_BlogPostsChanged;
+        }
+
+
+        private async void BlogDb_BlogPostsChanged(object sender, EventArgs e)
+        {
+            topics = await UpdateTopicsAsync();
+            StateHasChanged();
+        }
+
+        private void TopicClicked(string topic)
+        {
+            //System.Diagnostics.Debug.WriteLine(topic);
+            OnTopicClick.InvokeAsync(topic);
+        }
+
+
+        private async Task<List<Topic>> UpdateTopicsAsync()
+        {
+            var dict = new Dictionary<string, Topic>();
+
+            foreach (var bp in await BlogDb.GetHeadersAsync().ToListAsync())
+            {
+                if (bp != null && bp.Topics != null)
+                {
+                    foreach (var t in bp.Topics)
+                    {
+                        Topic tp;
+                        if (!dict.TryGetValue(t, out tp))
+                        {
+                            tp = new Topic();
+                            tp.DispId = t;
+                            dict.Add(tp.DispId, tp);
+                        }
+                        tp.Count++;
+                    }
+                }
+            }
+
+            return new List<Topic>(dict.Values
+                .OrderByDescending(t => t.Count)
+                .OrderBy(t => t.DispId)
+                );
+        }
+    }
+}
+

Blog3000/Client/Shared/TopicContent.razor

@@ -0,0 +1,34 @@
+@using Blog3000.Shared;
+
+    <div class="card topic-content">
+
+            <div class="card-title"><span class="topic-quick-link" @onclick="@(e => TopicClicked(Topic.DispId))">@Topic.DispId</span></div>
+            <div class="card-body">
+                <ul>
+                    @foreach (var i in sortedPosts)
+                    {
+                        var x = "viewer/" + @i.Id;
+
+                        <li style="text-wrap: none">
+                            <NavLink class="nav-link" href="@x">
+                                @i.Title <small>
+                                (@{
+                                    var r = i.Revisions?.Latest();
+                                    var a = r?.Author ?? i.Author;
+                                    var t = (r?.ChangedAt?.ToShortDateString() ?? "???")
+                                        + ", "
+                                        + (r?.ChangedAt?.ToShortTimeString() ?? "???");
+                                }@a, @t UTC)
+                            </small>
+                        </NavLink>
+                    </li>
+                }
+                </ul>
+            </div>
+
+
+    </div>
+
+@code {
+
+}

Blog3000/Client/Shared/TopicContent.razor.cs

@@ -0,0 +1,40 @@
+using Microsoft.AspNetCore.Components;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+namespace Blog3000.Client.Shared
+{
+    public partial class TopicContent
+    {
+
+        [Parameter]
+        public TopTopics.Topic Topic { get; set; }
+
+
+         [Parameter]
+        public TopTopics Owner { get; set; }
+
+
+        private List<BlogPostHeader> sortedPosts;
+
+
+
+        protected override void OnInitialized()
+        {
+            var s = new List<BlogPostHeader>(Topic?.Posts);
+            s.Sort((a, b) => DateTime.Compare(
+                b.Revisions?.Latest()?.ChangedAt ?? DateTime.MinValue,
+                a.Revisions?.Latest()?.ChangedAt ?? DateTime.MinValue));
+            sortedPosts = s.Take(5).ToList();
+        }
+
+
+        private void TopicClicked(string topic)
+        {
+            //System.Diagnostics.Debug.WriteLine(topic);
+            Owner?.OnTopicClick.InvokeAsync(topic);
+        }
+
+    }
+}

Blog3000/Client/Shared/Updater.razor

@@ -0,0 +1,28 @@
+@inject HttpClient Http
+@inject Blazored.LocalStorage.ILocalStorageService localStorage
+
+    <div>
+        Updater
+        <span>
+            <a href="#" class="oi oi-reload" title="Force update" @onclick="ForceUpdate"></a>|<span title="Networkstatus">@netStatus</span>|Install|
+                                                                                              <span class="lnk" title="Offline Caching" @onclick="ToggleLoadingMode"><span>OfflineCache:</span>
+                                                                                                  @if (isEagerLoading)
+                                                                                                  {
+                                                                                                      <span>ON</span>
+                                                                                                  }
+                                                                                                  else
+                                                                                                  {
+                                                                                                      <span>OFF</span>
+                                                                                                  }
+                                                                                              </span>
+</span>
+        <!--span>
+            <input type="checkbox" class="custom-control-input" id="eagerImgLoad">
+            <label class="custom-control-label" for="eagerImgLoad">Preload imgs</label>
+        <span -->
+        <div>Status: @Status</div>
+    </div>
+
+@code {
+    
+}

Blog3000/Client/Shared/Updater.razor.cs

@@ -0,0 +1,225 @@
+using Microsoft.AspNetCore.Components;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Shared
+{
+    public partial class Updater
+    {
+
+        [Inject]
+        public NetworkStatus NetworkStatus { get; set; }
+
+        [Inject]
+        private BlogDb BlogDb { get; set; }
+
+
+        [Inject]
+        private Config Config{ get; set; }
+
+        [Inject]
+        private ViewStats ViewStats { get; set; }
+
+        [Inject]
+        private Services.ImgCacheStorage Cache { get; set; }
+
+        private int postsLoaded = 0;
+
+        private string _status;
+        private string Status {
+            get { return _status; }
+            set { _status = value; StateHasChanged(); }
+        }
+
+        private string netStatus = "";
+
+        private bool isEagerLoading = false;
+        private bool isUpdating = false;
+        private bool updateRequested = false;
+        private System.Timers.Timer updateTimer;
+
+        public void Dispose()
+        {
+            updateTimer?.Dispose();
+            updateTimer = null;
+        }
+
+        protected override async Task OnInitializedAsync()
+        {
+            updateRequested = true;
+            NetworkStatus.StatusChanged += NetworkStatus_Changed;
+            NetworkStatus_Changed(this, EventArgs.Empty);
+            // Already run by NetworkStatusChanged! await RunUpdateAsync();
+
+            //await Cache.Add("/");
+
+            isEagerLoading = await BlogDb.IsEagerLoading();
+            
+            updateTimer = new System.Timers.Timer(900 * 1000);
+            updateTimer.AutoReset = true;
+            updateTimer.Elapsed += Timer_Elapsed;
+            updateTimer.Start();
+        }
+
+       
+
+        /// <summary>
+        /// Forces update. If offline update will be delayed until it comes online
+        /// </summary>
+        private void ForceUpdate()
+        {
+            updateRequested = true;
+            _ = RunUpdateAsync();
+            //_ = Config.FetchAsync();
+        }
+
+
+        private void ToggleLoadingMode()
+        {
+            isEagerLoading = !isEagerLoading;
+            BlogDb.SetEagerLoading(isEagerLoading);
+            if (isEagerLoading) ForceUpdate();
+            StateHasChanged();
+        }
+
+
+        private void NetworkStatus_Changed(object sender, EventArgs e)
+        {
+            if (NetworkStatus.IsOnline && updateRequested)
+            {
+                Task.Run(async () =>
+                {
+                    System.Diagnostics.Debug.WriteLine("Network came online");
+                    try
+                    {
+                        await RunUpdateAsync();
+                    }
+                    finally
+                    {
+                        updateRequested = false;
+                    }
+                });
+            }
+
+            var ns = NetworkStatus.IsOnline ? "Online" : "Offline";
+            if (!ns.Equals(netStatus))
+            {
+                netStatus = ns;
+                this.StateHasChanged();
+            }
+       
+        }
+
+        private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
+        {
+            System.Diagnostics.Debug.WriteLine("Update timer elappsed");
+            ForceUpdate() ;
+        }
+
+        private async Task<bool> RunUpdateAsync()
+        {
+            // TODO: Move most to this to BlogDb
+
+            if (this.isUpdating)
+            {
+                System.Diagnostics.Debug.WriteLine("Udpdater: already running, abort");
+                return false;
+            }
+            else
+            {
+                System.Diagnostics.Debug.WriteLine("Updater: start");
+                this.isUpdating = true;
+
+                if (!NetworkStatus.IsOnline)
+                {
+                    Status = "Updater: Network offline";
+                    return false;
+                }
+
+                try
+                {
+                    Status = "Syncing stats...";
+                    System.Diagnostics.Debug.WriteLine($"Updater: Syncing stats...");
+                    await ViewStats.SyncViewStats();
+
+                    int changes = 0;                   
+                    BlogPostHeader[] blogPosts = await Http.GetJsonAsync<BlogPostHeader[]>("BlogPosts");
+                    postsLoaded = blogPosts.Length;
+
+                    System.Diagnostics.Debug.WriteLine($"Updater: Total remote blogPosts: {blogPosts.Length}");
+                    Status = $"{blogPosts.Length} verfügbar";
+
+                    await localStorage.SetItemAsync(BlogDb.DBKEY_PREFIX_HDR + "remotePosts", blogPosts);
+
+                    var dict = new Dictionary<string, bool>();
+                    
+                    foreach (var b in blogPosts)
+                    {
+                        dict.Add(b.Id, true);
+                        if (isEagerLoading)
+                        {
+                            var storedPost = await localStorage.GetItemAsync<BlogPost>(BlogDb.DBKEY_PREFIX_BLOGCACHE + b.Id);
+
+                            bool forceSync = false;
+                            if (/* TODO: eagerCaching || isInstalled */storedPost != null && (storedPost.ImageRefs?.Count ?? 0) > 0)
+                            {
+                                forceSync = !await BlogDb.AreImagesCached(b.Id);
+                                if (forceSync) System.Diagnostics.Debug.WriteLine($"BlogPosts: forcing sync of {b.Id} due to missing img");
+                            }
+
+                            if ((forceSync) || (storedPost == null) || !((b.Checksum ?? "").Equals(storedPost.Checksum)))
+                            {
+                                Status = $"Hole '{b.Title}'...";
+                                await BlogDb.SyncPost(b.Id, true);
+                                System.Diagnostics.Debug.WriteLine($"BlogPosts: 1 neuer geholt {b.Id}, Update of {storedPost?.Id ?? "new"}");
+                                changes++;
+                            }
+                            await Task.Delay(50);
+                        }                        
+                    }
+
+                    int storedN = await localStorage.LengthAsync();
+                    for (var i = 0; i < storedN; i++)
+                    {
+                        string id = await localStorage.KeyAsync(i);
+                        if (id != null && id.StartsWith(BlogDb.DBKEY_PREFIX_BLOGCACHE))
+                        {
+                            var oid = id.Substring(BlogDb.DBKEY_PREFIX_BLOGCACHE.Length);
+                            if (!dict.ContainsKey(oid))
+                            {
+                                Status = $"Entferne {oid}...";
+                                this.StateHasChanged();
+                                await localStorage.RemoveItemAsync(id);
+                                System.Diagnostics.Debug.WriteLine($"BlogPosts: 1 alter entfernt: {oid}");
+                                changes++;
+                            }
+                        }
+                        await Task.Yield();
+                    }
+
+
+                    Status = $"{DateTime.Now}: {dict.Count} post(s) in store, {changes} changes";
+
+                    return true;
+                }
+                catch (Exception ex)
+                {
+                    System.Diagnostics.Debug.WriteLine("Error updating blogPots", ex);
+                    Status = $"Updater failed {ex.Message}";
+                }
+                finally
+                {
+                    System.Diagnostics.Debug.WriteLine("Updater end");
+                    this.isUpdating = false;
+                }
+                return false;
+            }
+        }
+
+    }
+}

Blog3000/Client/Utils/PromiseInvoker.cs

@@ -0,0 +1,65 @@
+using Microsoft.JSInterop;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Client.Utils
+{
+    /// <summary>
+    /// See this for more infos on await promises:
+    /// https://toddlittlejohn.com/2019/09/15/blazor-javascript-interoperability/
+    /// </summary>
+    public static class PromiseInvoker
+    {
+        public class PromiseInvokerCallback<T>
+        {
+            public readonly TaskCompletionSource<T> tcs = new TaskCompletionSource<T>();
+            
+            [JSInvokable("SetResult")]
+            public void SetResult(T o)
+            {                
+                tcs.SetResult(o);
+            }
+
+
+            [JSInvokable("SetException")]
+            public void SetException(string s)
+            {
+                tcs.SetException(new InvalidOperationException(s));
+            }
+        }
+
+
+        public static async Task<T> InvokePromiseAsync<T>(this IJSRuntime jsRuntime, string funcName, params object[] prms)
+        {
+            var cb = new PromiseInvokerCallback<T>();
+            object[] fp = new object[(prms?.Length ?? 0) + 1];
+            fp[0] = DotNetObjectReference.Create(cb);
+            if (prms != null && prms.Length > 0)
+            {
+                Array.Copy(prms, 0, fp, 1, prms.Length);
+            }
+            _ = jsRuntime.InvokeAsync<T>(funcName, fp);
+            return await cb.tcs.Task;
+
+            //return await InvokePromise<T>(jsRuntime, funcName, prms);
+        }
+
+
+        public static Task<T> InvokePromise<T>(this IJSRuntime jsRuntime, string funcName, params object[] prms)
+        {
+            var cb = new PromiseInvokerCallback<T>();
+            object[] fp = new object[(prms?.Length ?? 0) + 1];
+            fp[0] = DotNetObjectReference.Create(cb);
+            if (prms != null && prms.Length > 0)
+            {
+                Array.Copy(prms, 0, fp, 1, prms.Length);
+            }
+            jsRuntime.InvokeAsync<T>(funcName, fp);
+            return cb.tcs.Task;
+        }
+
+
+    }
+}

Blog3000/Client/_Imports.razor

@@ -0,0 +1,7 @@
+@using System.Net.Http
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.AspNetCore.Components.Web
+@using Microsoft.JSInterop
+@using Blog3000.Client
+@using Blog3000.Client.Shared

Blog3000/Client/wwwroot/css/fonts/source-code-pro.css

@@ -0,0 +1,111 @@
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 200;
+    font-style: normal;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-ExtraLight.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-ExtraLight.otf.woff') format('woff'), url('./OTF/SourceCodePro-ExtraLight.otf') format('opentype'), url('./TTF/SourceCodePro-ExtraLight.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 200;
+    font-style: italic;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-ExtraLightIt.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-ExtraLightIt.otf.woff') format('woff'), url('./OTF/SourceCodePro-ExtraLightIt.otf') format('opentype'), url('./TTF/SourceCodePro-ExtraLightIt.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 300;
+    font-style: normal;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-Light.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-Light.otf.woff') format('woff'), url('./OTF/SourceCodePro-Light.otf') format('opentype'), url('./TTF/SourceCodePro-Light.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 300;
+    font-style: italic;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-LightIt.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-LightIt.otf.woff') format('woff'), url('./OTF/SourceCodePro-LightIt.otf') format('opentype'), url('./TTF/SourceCodePro-LightIt.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 400;
+    font-style: normal;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-Regular.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-Regular.otf.woff') format('woff'), url('./OTF/SourceCodePro-Regular.otf') format('opentype'), url('./TTF/SourceCodePro-Regular.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 400;
+    font-style: italic;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-It.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-It.otf.woff') format('woff'), url('./OTF/SourceCodePro-It.otf') format('opentype'), url('./TTF/SourceCodePro-It.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 500;
+    font-style: normal;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-Medium.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-Medium.otf.woff') format('woff'), url('./OTF/SourceCodePro-Medium.otf') format('opentype'), url('./TTF/SourceCodePro-Medium.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 500;
+    font-style: italic;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-MediumIt.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-MediumIt.otf.woff') format('woff'), url('./OTF/SourceCodePro-MediumIt.otf') format('opentype'), url('./TTF/SourceCodePro-MediumIt.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 600;
+    font-style: normal;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-Semibold.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-Semibold.otf.woff') format('woff'), url('./OTF/SourceCodePro-Semibold.otf') format('opentype'), url('./TTF/SourceCodePro-Semibold.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 600;
+    font-style: italic;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-SemiboldIt.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-SemiboldIt.otf.woff') format('woff'), url('./OTF/SourceCodePro-SemiboldIt.otf') format('opentype'), url('./TTF/SourceCodePro-SemiboldIt.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 700;
+    font-style: normal;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-Bold.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-Bold.otf.woff') format('woff'), url('./OTF/SourceCodePro-Bold.otf') format('opentype'), url('./TTF/SourceCodePro-Bold.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 700;
+    font-style: italic;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-BoldIt.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-BoldIt.otf.woff') format('woff'), url('./OTF/SourceCodePro-BoldIt.otf') format('opentype'), url('./TTF/SourceCodePro-BoldIt.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 900;
+    font-style: normal;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-Black.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-Black.otf.woff') format('woff'), url('./OTF/SourceCodePro-Black.otf') format('opentype'), url('./TTF/SourceCodePro-Black.ttf') format('truetype');
+}
+
+@font-face {
+    font-family: 'Source Code Pro';
+    font-weight: 900;
+    font-style: italic;
+    font-stretch: normal;
+    src: url('./WOFF2/TTF/SourceCodePro-BlackIt.ttf.woff2') format('woff2'), url('./WOFF/OTF/SourceCodePro-BlackIt.otf.woff') format('woff'), url('./OTF/SourceCodePro-BlackIt.otf') format('opentype'), url('./TTF/SourceCodePro-BlackIt.ttf') format('truetype');
+}

Blog3000/Client/wwwroot/css/open-iconic/FONT-LICENSE

@@ -0,0 +1,86 @@
+SIL OPEN FONT LICENSE Version 1.1
+
+Copyright (c) 2014 Waybury
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

Blog3000/Client/wwwroot/css/open-iconic/ICON-LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Waybury
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

Blog3000/Client/wwwroot/css/open-iconic/README.md

@@ -0,0 +1,114 @@
+[Open Iconic v1.1.1](http://useiconic.com/open)
+===========
+
+### Open Iconic is the open source sibling of [Iconic](http://useiconic.com). It is a hyper-legible collection of 223 icons with a tiny footprint—ready to use with Bootstrap and Foundation. [View the collection](http://useiconic.com/open#icons)
+
+
+
+## What's in Open Iconic?
+
+* 223 icons designed to be legible down to 8 pixels
+* Super-light SVG files - 61.8 for the entire set 
+* SVG sprite—the modern replacement for icon fonts
+* Webfont (EOT, OTF, SVG, TTF, WOFF), PNG and WebP formats
+* Webfont stylesheets (including versions for Bootstrap and Foundation) in CSS, LESS, SCSS and Stylus formats
+* PNG and WebP raster images in 8px, 16px, 24px, 32px, 48px and 64px.
+
+
+## Getting Started
+
+#### For code samples and everything else you need to get started with Open Iconic, check out our [Icons](http://useiconic.com/open#icons) and [Reference](http://useiconic.com/open#reference) sections.
+
+### General Usage
+
+#### Using Open Iconic's SVGs
+
+We like SVGs and we think they're the way to display icons on the web. Since Open Iconic are just basic SVGs, we suggest you display them like you would any other image (don't forget the `alt` attribute).
+
+```
+<img src="/open-iconic/svg/icon-name.svg" alt="icon name">
+```
+
+#### Using Open Iconic's SVG Sprite
+
+Open Iconic also comes in a SVG sprite which allows you to display all the icons in the set with a single request. It's like an icon font, without being a hack.
+
+Adding an icon from an SVG sprite is a little different than what you're used to, but it's still a piece of cake. *Tip: To make your icons easily style able, we suggest adding a general class to the* `<svg>` *tag and a unique class name for each different icon in the* `<use>` *tag.*  
+
+```
+<svg class="icon">
+  <use xlink:href="open-iconic.svg#account-login" class="icon-account-login"></use>
+</svg>
+```
+
+Sizing icons only needs basic CSS. All the icons are in a square format, so just set the `<svg>` tag with equal width and height dimensions.
+
+```
+.icon {
+  width: 16px;
+  height: 16px;
+}
+```
+
+Coloring icons is even easier. All you need to do is set the `fill` rule on the `<use>` tag.
+
+```
+.icon-account-login {
+  fill: #f00;
+}
+```
+
+To learn more about SVG Sprites, read [Chris Coyier's guide](http://css-tricks.com/svg-sprites-use-better-icon-fonts/).
+
+#### Using Open Iconic's Icon Font...
+
+
+##### …with Bootstrap
+
+You can find our Bootstrap stylesheets in `font/css/open-iconic-bootstrap.{css, less, scss, styl}`
+
+
+```
+<link href="/open-iconic/font/css/open-iconic-bootstrap.css" rel="stylesheet">
+```
+
+
+```
+<span class="oi oi-icon-name" title="icon name" aria-hidden="true"></span>
+```
+
+##### …with Foundation
+
+You can find our Foundation stylesheets in `font/css/open-iconic-foundation.{css, less, scss, styl}`
+
+```
+<link href="/open-iconic/font/css/open-iconic-foundation.css" rel="stylesheet">
+```
+
+
+```
+<span class="fi-icon-name" title="icon name" aria-hidden="true"></span>
+```
+
+##### …on its own
+
+You can find our default stylesheets in `font/css/open-iconic.{css, less, scss, styl}`
+
+```
+<link href="/open-iconic/font/css/open-iconic.css" rel="stylesheet">
+```
+
+```
+<span class="oi" data-glyph="icon-name" title="icon name" aria-hidden="true"></span>
+```
+
+
+## License
+
+### Icons
+
+All code (including SVG markup) is under the [MIT License](http://opensource.org/licenses/MIT).
+
+### Fonts
+
+All fonts are under the [SIL Licensed](http://scripts.sil.org/cms/scripts/page.php?item_id=OFL_web).

Blog3000/Client/wwwroot/css/open-iconic/font/fonts/open-iconic.svg

@@ -0,0 +1,543 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
+<!--
+2014-7-1: Created.
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+<metadata>
+Created by FontForge 20120731 at Tue Jul  1 20:39:22 2014
+ By P.J. Onori
+Created by P.J. Onori with FontForge 2.0 (http://fontforge.sf.net)
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+    <glyph glyph-name="d6" unicode="&#xe0d6;" horiz-adv-x="600" 
+d="M334 800h66v-800h-66l-134 200h-200v400h200zM500 500l25 -3c44 -11 75 -51 75 -97s-32 -86 -75 -97l-25 -3v200z" />
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+  </font>
+</defs></svg>

Blog3000/Client/wwwroot/css/site.css

@@ -0,0 +1,561 @@
+@import url('open-iconic/font/css/open-iconic-bootstrap.min.css');
+
+@import url('fonts/source-code-pro.css');
+
+:root {
+    --back-color: black;
+    --back-box-color: #080b3e;
+    --text-color: lightgreen;
+    --text-hi-color: yellow;
+    --sub-text-color: #149d14;
+    --status-text-color: #0a810a;
+    --error--text-color: red;
+    --link-color: #8eceff;
+    --link--hov-color: #7e7dff;
+    --input-color: #e07b00;
+    --input-back-color: #042d57;
+    --input-back-focus-color: #255d98;
+    --toggle-width: 768px;
+}
+
+@font-face {
+    font-family: 'clacon';
+    src: url('./fonts/Inconsolata-VariableFont_ww.ttf')  format("truetype-variations");
+    font-weight: 400 999;
+    font-stretch: 75% 200%;
+}
+
+html, body {
+    //font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
+    //font-family: 'Source Code Pro', Courier, monospace;
+    font-family: clacon, Consolas, Courier, monospace;
+    //font-family: Georgia, 'Times New Roman', Times, serif;
+    //zoom: 1.00; /* For Times New Roman, consolas */
+
+    background: var(--back-color);
+    color: var(--text-color);
+    font-weight: 500;
+}
+
+
+
+
+a, .btn-link {
+    color: var(--link-color);
+}
+
+a:hover, .btn-link:hover {
+    color: var(--link--hov-color);    
+}
+
+.btn-primary {
+    color: #fff;
+    background-color: #1b6ec2;
+    border-color: #1861ac;
+}
+
+
+.searchbox > input.search {    
+    color: var(--input-color);    
+    background: var(--input-back-color);
+    border-color: transparent;
+}
+
+
+    .searchbox > input.search:focus {
+        background: var(--input-back-focus-color);
+    }
+
+app {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+.top-row {
+    min-height: 3.5rem;
+    display: flex;
+    align-items: center;
+}
+
+.main {
+    flex: 1;
+}
+
+    .main .top-row {
+        background-color: #f7f7f7;
+        border-bottom: 1px solid #d6d5d5;
+        justify-content: flex-end;
+    }
+
+        .main .top-row > a, .main .top-row .btn-link {
+            white-space: nowrap;
+            margin-left: 1.5rem;
+        }
+
+        .main .top-row a:first-child {
+            overflow: hidden;
+            text-overflow: ellipsis;
+        }
+
+.sidebar {
+    //background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+    background-color: var(--back-box-color);
+    color: var(--text-hi-color);
+}
+
+    .sidebar .top-row {
+        //background-color: rgba(0,0,0,0.4);
+        background-color: var(--back-box-color);
+        border-bottom-color: yellow;
+        border-bottom-width: 1px;
+        border-bottom-style: dotted;
+    }
+
+    .sidebar .navbar-brand {
+        font-size: 1.3rem;
+        color: var(--text-hi-color);
+    }
+
+    .sidebar .oi {
+        width: 2rem;
+        font-size: 1.3rem;
+        vertical-align: text-top;
+        top: -2px;
+    }
+
+    .sidebar .nav-item {
+        font-size: 1.1rem;
+        padding-bottom: 0.5rem;
+    }
+
+        .sidebar .nav-item:first-of-type {
+            padding-top: 1rem;
+        }
+
+        .sidebar .nav-item:last-of-type {
+            padding-bottom: 1rem;
+        }
+
+        .sidebar .nav-item a {
+            color: var(--text-hi-color);
+            border-radius: 4px;
+            height: 3rem;
+            display: flex;
+            align-items: center;
+            line-height: 3rem;
+        }
+
+            .sidebar .nav-item a.active {
+                background-color: rgba(255,255,255,0.25);
+                //color: white;
+                color: var(--text-hi-color);
+            }
+
+            .sidebar .nav-item a:hover {
+                background-color: rgba(255,255,255,0.1);
+                //color: white;
+                color: var(--text-hi-color);
+            }
+
+.content {
+    padding-top: 1.1rem;
+    padding-left: 0.6rem !important;
+    padding-right: 0.6rem !important;
+}
+
+.navbar-toggler {
+    background-color: rgba(255, 255, 255, 0.1);
+}
+
+.navbar .social-links {
+    font-size: 87%;
+}
+
+.navbar .social-link {    
+    display: inline-block;
+}
+
+.navbar .social-link a {
+    text-decoration: none;
+}
+
+
+    .navbar .social-link > * {
+        display: inline;
+    }
+
+
+@media (min-width: 768px) {
+    .navbar .social-link {
+        display: block;
+    }
+}
+
+
+@media (max-width: 767px) {
+    .navbar .social-link {
+        display: inline;        
+    }
+
+    .navbar .social-links {
+        margin-left: auto;
+        margin-right: 0.7rem;
+        font-stretch: condensed;
+    }    
+}
+
+
+
+.valid.modified:not([type=checkbox]) {
+    outline: 1px solid #26b050;
+}
+
+    .invalid {
+        outline: 1px solid red;
+    }
+
+    .validation-message {
+        color: red;
+    }
+
+    #blazor-error-ui {
+        background: lightyellow;
+        bottom: 0;
+        box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
+        display: none;
+        left: 0;
+        padding: 0.6rem 1.25rem 0.7rem 1.25rem;
+        position: fixed;
+        width: 100%;
+        z-index: 1000;
+    }
+
+        #blazor-error-ui .dismiss {
+            cursor: pointer;
+            position: absolute;
+            right: 0.75rem;
+            top: 0.5rem;
+        }
+
+
+    /* own styles */
+    .updater {
+        display: flex;
+        align-items: center;
+        height: 3.2em;
+        color: var(--status-text-color);
+        background: var(--back-box-color);
+        font-size: 0.85em;
+        padding-left: 0.6rem;
+        padding-right: 0.6rem;
+        padding-top: 0.2em;
+    }
+
+        .updater .lnk {
+            text-decoration: underline;
+            color: var(--link-color);
+            font-style: italic;
+            cursor: pointer;
+        }
+
+    h3.section-title {
+        font-size: 1.6em;
+        font-weight: bold
+    }
+
+
+    /* index page */
+    @media (max-width: 30em) {
+        .topic-list.index-page {
+            visibility: hidden;
+            display: none;
+        }
+    }
+
+    .top-topics.index-page {
+        margin-top: 1em;
+    }
+
+    .top-cloud.index-page {
+        margin-top: 1em;
+    }
+
+    /* post-finder */
+
+    .post-finder {
+        font-size: 14pt;
+    }
+
+
+        .post-finder .searchbox {
+            width: 100%;
+            display: flex;
+            flex-direction: row;
+        }
+
+            .post-finder .searchbox > input {
+                margin-right: 0.25em;
+            }
+
+            .post-finder .searchbox .searchbut {
+                margin-left: 0.25em;
+            }
+
+            .post-finder .searchbox > * {
+                display: inline-block;
+            }
+
+        .post-finder .error-msg {
+            color: var(--error--text-color);
+            display: block;
+        }
+
+
+        .post-finder .section-title {
+            font-weight: bold;
+            margin-top: 1em;
+        }
+
+        .post-finder .navbar {
+            font-size: 90%;
+            display: block;
+            width: 100%;
+            padding: 0;
+            color: yellow;
+            margin-top: 0.7em;
+            margin-bottom: 0.9em;
+            display: flex;
+            align-items: flex-end;
+        }
+
+            .post-finder .navbar .showing {
+                background-color: blue;
+                flex-grow: 1;
+                margin-right: 0.3em;
+                padding-top: 0.3rem;
+                padding-left: 0.2rem;
+                font-stretch: semi-condensed;
+            }
+
+            .post-finder .navbar button.btn-primary {
+                cursor: pointer;
+                margin-right: 0.3em;
+                width: 3em;
+            }
+
+
+        .post-finder ul {
+            line-height: initial;
+        }
+
+        .post-finder li {
+            margin-top: 0.85rem;
+        }
+
+            .post-finder li .nav-link > * {
+                color: var(--sub-text-color);
+            }
+
+            .post-finder li abstract {
+                font-size: 75%;
+                display: block;
+                clear: left;
+                margin-left: 1rem;
+                //margin-top: 0.2rem;
+            }
+
+
+
+            .post-finder li small {
+                font-size: 75%;
+                font-style: italic;
+                display: block;
+                clear: left;
+                margin-left: 1rem;
+                //margin-top: -0.3rem;
+            }
+
+        .post-finder ul {
+            padding-inline-start: 20px;
+        }
+
+        .post-finder .nav-link {
+            padding: 0;
+        }
+
+
+    .topic-quick-link {
+        text-decoration: underline;
+        color: var(--link-color);
+        font-style: italic;
+        cursor: pointer;
+    }
+
+    .topic-cloud {
+        font-size: 1.0em;
+        margin-top: 2rem;
+    }
+
+
+        .topic-cloud .topic-items {
+            margin-right: 0.5em;
+            padding: 0.5em;
+            background-color: var(--back-box-color);
+            border-radius: 0.5em;
+            margin-right: 0.5em;
+            margin-bottom: 0.5em;
+            padding: 0.5em;
+            display: inline-block;
+        }
+
+
+    /* top-topics-list / topic-content */
+
+
+    .topic-content {
+        font-size: 0.99em;
+        line-height: initial;
+        display: inline-block;
+        background: var(--back-box-color);
+        margin: 0.5rem;
+        margin-top: 1em;
+        margin-bottom: 1em;
+        width: 19em;
+        vertical-align: top
+    }
+
+        .topic-content small {
+            font-size: 0.85em;
+            font-style: italic;
+            display: block;
+            clear: left;
+        }
+
+        .topic-content .card-title {
+            font-weight: bold;
+            margin-bottom: 0.4em;
+        }
+
+        .topic-content .card-body {
+            padding: 0.15rem;
+        }
+
+        .topic-content ul {
+            padding-inline-start: 20px;
+        }
+
+        .topic-content li {
+            margin-top: 0.6em;
+        }
+
+            .topic-content li small {
+                margin-top: 0.1rem;
+                color: var(--sub-text-color);
+            }
+
+        .topic-content .nav-link {
+            padding: 0;
+        }
+
+
+
+    .viewer {
+        background: black;
+        color: lightgreen;
+        padding: 3px;
+        // Would be cool https://css-tricks.com/old-timey-terminal-styling/
+    }
+
+        .viewer h1 {
+            font-stretch: condensed;
+            font-weight: 600;
+            word-break: break-word;
+        }
+
+        . viewer h2 {
+            font-weight: 600;
+            font-stretch: condensed;
+        }
+
+        .viewer img {
+            overflow-x: scroll;
+            max-width: 100%;
+        }
+
+    .blog-powered-by {
+        font-size: 80%;
+        font-style: italic;
+        text-align: right;
+        width: 100%;
+        padding-left: 0.3em;
+        padding-right: 0.3em;
+        color: var(--status-text-color)
+    }
+
+
+    .blog-contact {
+        font-size: 90%;
+        font-style: italic;
+        text-align: right;
+        width: 100%;
+        padding-left: 0.3em;
+        padding-right: 0.3em;
+        color: var(--status-text-color)
+    }
+
+
+
+    /* media dependant styles */
+
+
+    @media (max-width: 767.98px) {
+        .main .top-row:not(.auth) {
+            display: none;
+        }
+
+        .main .top-row.auth {
+            justify-content: space-between;
+        }
+
+        .main .top-row a, .main .top-row .btn-link {
+            margin-left: 0;
+        }
+
+        .updater {
+            font-stretch: condensed;
+        }
+    }
+
+    @media (min-width: 768px) {
+        app {
+            flex-direction: row;
+        }
+
+        .sidebar {
+            width: 250px;
+            height: 100vh;
+            position: sticky;
+            top: 0;
+        }
+
+        .main .top-row {
+            position: sticky;
+            top: 0;
+        }
+
+        .main > div {
+            padding-left: 2rem !important;
+            padding-right: 1.5rem !important;
+        }
+
+        .navbar-toggler {
+            display: none;
+        }
+
+        .sidebar .collapse {
+            /* Never collapse the sidebar for wide screens */
+            display: block;
+        }
+    }
+

Blog3000/Client/wwwroot/index.html

@@ -0,0 +1,253 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width" />
+    <title>blog3000 powered blog</title>
+    <base href="/" />
+    <link href="css/bootstrap/bootstrap.min.css" rel="stylesheet" />
+    <link href="css/site.css" rel="stylesheet" />
+    <link href="css/github-stylesheet.css" rel="stylesheet" />
+    <link href="manifest.json" rel="manifest" />
+</head>
+
+
+<body>
+    <app>Loading page (blazor-app, modern browser required for this to work)...</app>
+
+    <div id="blazor-error-ui">
+        An unhandled error has occurred.
+        <a href="" class="reload">Reload</a>
+        <a class="dismiss">🗙</a>
+    </div>
+    <script src="_framework/blazor.webassembly.js"></script>
+    <script>navigator.serviceWorker.register('service-worker.js');</script>
+    <script>
+    window.Network = {
+            Init: function (interop) {
+                function handler() {
+                    interop.invokeMethodAsync("Network.StatusChanged", navigator.onLine);
+                }
+
+                window.addEventListener('online', handler);
+                window.addEventListener('offline', handler);
+
+                if (!navigator.onLine) {
+                    handler(navigator.onLine);
+                }
+            }
+        };
+
+
+        class MyCacheStorage {
+
+            // TODO: Improve SetException, pass object instead of string?
+
+            static async Create(cbObject, cacheId) {
+                try {
+                    let i = new MyCacheStorage();
+                    i.cacheId = cacheId;
+                    i.myCache = await caches.open(cacheId);                   
+                    window[cacheId] = i;
+                    if (!await caches.has(cacheId)) {
+                        //Should not occurr on a healthy system, was probably a red herring during debugging 
+                        /*                        
+                        console.warn("Cache NOT " + cacheId + " created, retry in 1000ms");
+                        setTimeout(() => {
+                            caches.open(cacheId).then((c) => {
+                                caches.has(cacheId).then((b) => {
+                                    if (!b) {
+                                        console.warn("Cache NOT " + cacheId + "created, giving up");
+                                        cbObject.invokeMethodAsync("SetResult", false);
+                                    }
+                                    else {
+                                        console.log("Cache: " + cacheId + " created");
+                                        cbObject.invokeMethodAsync("SetResult", true);
+                                    }
+                                })                                   
+                            });
+                        }, 1000);*/
+                        console.log("Cache" + cacheId + " NOT created");
+                        cbObject.invokeMethodAsync("SetResult", false);
+                    }
+                    else {
+                        console.log("Cache: " + cacheId + " created");
+                        cbObject.invokeMethodAsync("SetResult", true);
+                    }
+                }
+                catch (e) {
+                    console.warn(e);
+                    cbObject.invokeMethodAsync("SetException", "" + e);
+                }
+            }
+
+            async CheckCache() {
+                if (!await caches.has(this.cacheId)) {
+                    // Should only occur on cache reset e.g. during debugging!
+                    console.log("Cache" + this.cacheId + "  NOT found, reopening");
+                    this.myCache = await caches.open(this.cacheId);     
+                    if (!await caches.has(this.cacheId)) {
+                        console.log("Cache " + this.cacheId + " still NOT found, failing");
+                        throw new ("Cache " + this.cacheId + " not openable/creatable");
+                    }
+                }
+            }
+
+            async Add(cbObject, url) {
+                try {
+                    await this.CheckCache();
+                    await this.myCache.add(url);
+                    //console.log("my-cache added to", url);
+                    cbObject.invokeMethodAsync("SetResult", true);
+                }
+                catch (e) {
+                    console.warn(e);
+                    cbObject.invokeMethodAsync("SetException", "" + e);
+                }
+            }
+
+            async AddAll(cbObject, urls) {
+                try {
+                    if (typeof (urls) === "string") urls = [urls];                    
+
+                    await this.CheckCache();
+                    await this.myCache.addAll(urls);
+                    //console.log("my-cache added all to", urls);
+                    cbObject.invokeMethodAsync("SetResult", true);
+                }
+                catch (e) {
+                    console.warn(e, urls);
+                    cbObject.invokeMethodAsync("SetException", "" + e);
+                }
+            }
+
+            async Delete(cbObject, url) {
+                try {
+                    await this.CheckCache();
+                    await this.myCache.delete(url);
+                    //console.log("my-cache added to");
+                    cbObject.invokeMethodAsync("SetResult", true);
+                }
+                catch (e) {
+                    console.warn(e);
+                    cbObject.invokeMethodAsync("SetException", "" + e);
+                }
+            }
+
+
+            async MatchAll(cbObject, filter) {
+                try {
+                    // filter does not do contains-match, uri in cache
+                    // includes host-part etc, therefore built in filtering can't be used
+                    await this.CheckCache();
+                    var responses = await this.myCache.matchAll(/*filter*/);
+                    var matches = [];
+                    responses.forEach(function (element, index, array) {
+                        if (element.url.includes(filter)) {
+                            matches.push(element.url);
+                        }
+                    });
+
+                    //console.log(filter, matches);
+                    cbObject.invokeMethodAsync("SetResult", matches);
+                }
+                catch (e) {
+                    console.warn(e);
+                    cbObject.invokeMethodAsync("SetException", "" + e);
+                }
+            }
+
+
+            /**
+             * check if all given "filters" are in cache
+             * @param cbObject
+             * @param filters
+             */
+            async AreCached(cbObject, filters) {
+                try {
+                    if (typeof (filters) === "string") filters = [filters];
+
+                    // filter does not do contains-match, uri in cache
+                    // includes host-part etc, therefore built in filtering can't be used
+                    
+                    let res = true;                    
+                    await this.CheckCache();
+                    var responses = await this.myCache.matchAll(/*filter*/);
+                    if (responses && filters) {
+                        let match = null;
+                        filters.forEach(f => {
+                            responses.forEach(function (element, index, array) {
+                                if (element.url.includes(f)) {
+                                    match = element.url;
+                                    return;
+                                }
+                            });
+                            if (!match) {
+                                res = false;
+                                return;
+                            }
+                        });                        
+                    }
+                
+                    console.log(filters, res);
+                    cbObject.invokeMethodAsync("SetResult", res);
+                }
+                catch (e) {
+                    console.warn(e);
+                    cbObject.invokeMethodAsync("SetException", "" + e);
+                }
+            }
+        }
+
+
+        window.MyCacheStorage = MyCacheStorage;
+
+
+    </script>
+
+    <script>
+        /**
+         * 
+         * @param uri
+         * @param name optional, only works for same-origin attributes, otherwise server will override
+         */
+        window.downloadURI = function (uri, name) {
+            console.log("Preparing download of " + uri);
+            setTimeout(() => {
+                var link = document.createElement("a");
+                // If you don't know the name or want to use
+                // the webserver default set name = ''
+                if (name) {
+                    link.setAttribute('download', name);
+                }
+                link.href = uri;
+                document.body.appendChild(link);
+                link.click();
+                link.remove();
+            }, 1000);
+        }
+
+
+        window.scrollElmIntoView = function (element) {
+            //console.log("YY", element);
+            if (element) {
+                var rect = element.getBoundingClientRect();
+
+                // Scroll only when not in view!
+                if  (!(
+                    rect.top >= 0 &&
+                    rect.left >= 0 &&
+                    rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
+                    rect.right <= (window.innerWidth || document.documentElement.clientWidth)
+                )) element.scrollIntoView();
+            }
+        }
+
+        window.setTitle = function(txt) {
+            document.title = txt;
+        }
+    </script>
+</body>
+
+</html>

Blog3000/Client/wwwroot/manifest.json

@@ -0,0 +1,15 @@
+{
+  "name": "mh's-Blog",
+  "short_name": "blog.mh3000.net",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#03173d",
+  "icons": [
+    {
+      "src": "icon2.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ]
+}

Blog3000/Client/wwwroot/service-worker.js

@@ -0,0 +1,4 @@
+// In development, always fetch from the network and do not enable offline support.
+// This is because caching would make development more difficult (changes would not
+// be reflected on the first load after each change).
+self.addEventListener('fetch', () => { });

Blog3000/Client/wwwroot/service-worker.published.js

@@ -0,0 +1,49 @@
+// Caution! Be sure you understand the caveats before publishing an application with
+// offline support. See https://aka.ms/blazor-offline-considerations
+
+self.importScripts('./service-worker-assets.js');
+self.addEventListener('install', event => event.waitUntil(onInstall(event)));
+self.addEventListener('activate', event => event.waitUntil(onActivate(event)));
+self.addEventListener('fetch', event => event.respondWith(onFetch(event)));
+
+
+const cacheNamePrefix = 'offline-cache-';
+const cacheName = `${cacheNamePrefix}${self.assetsManifest.version}`;
+const offlineAssetsInclude = [ /\.dll$/, /\.pdb$/, /\.wasm/, /\.html/, /\.js$/, /\.json$/, /\.css$/, /\.woff$/, /\.png$/, /\.jpe?g$/, /\.gif$/, /\.ico$/ ];
+const offlineAssetsExclude = [/^service-worker\.js$/, /config\.json/];
+
+async function onInstall(event) {
+    console.info('Service worker: Install');
+
+    // Fetch and cache all matching items from the assets manifest
+    const assetsRequests = self.assetsManifest.assets
+        .filter(asset => offlineAssetsInclude.some(pattern => pattern.test(asset.url)))
+        .filter(asset => !offlineAssetsExclude.some(pattern => pattern.test(asset.url)))
+        .map(asset => new Request(asset.url, { integrity: asset.hash }));
+    await caches.open(cacheName).then(cache => cache.addAll(assetsRequests));
+}
+
+async function onActivate(event) {
+    console.info('Service worker: Activate');
+
+    // Delete unused caches
+    const cacheKeys = await caches.keys();
+    await Promise.all(cacheKeys
+        .filter(key => key.startsWith(cacheNamePrefix) && key !== cacheName)
+        .map(key => caches.delete(key)));
+}
+
+async function onFetch(event) {
+    let cachedResponse = null;
+    if (event.request.method === 'GET') {
+        // For all navigation requests, try to serve index.html from cache
+        // If you need some URLs to be server-rendered, edit the following check to exclude those URLs
+        const shouldServeIndexHtml = event.request.mode === 'navigate';
+
+        const request = shouldServeIndexHtml ? 'index.html' : event.request;
+        const cache = await caches.open(cacheName);
+        cachedResponse = await cache.match(request);
+    }
+
+    return cachedResponse || fetch(event.request);
+}

Blog3000/Server/.config/dotnet-tools.json

@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-ef": {
+      "version": "3.1.3",
+      "commands": [
+        "dotnet-ef"
+      ]
+    }
+  }
+}

Blog3000/Server/Blog3000.Server.csproj

@@ -0,0 +1,51 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <DisableImplicitComponentsAnalyzers>true</DisableImplicitComponentsAnalyzers>
+    <PackageId>Blog3000.Server</PackageId>
+    <Authors>Blog3000.Server</Authors>
+    <Product>Blog3000.Server</Product>
+    <StartupObject></StartupObject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Remove="app_data\hello-world.md" />
+    <None Remove="app_data\posts\mh\legal.md" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AspNetCoreRateLimit" Version="3.0.5" />
+    <PackageReference Include="Markdig" Version="0.20.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Server" Version="3.2.1" />
+    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.4" />
+    <PackageReference Include="Syslog.Framework.Logging" Version="2.2.0" />
+    <PackageReference Include="TweetinviAPI" Version="5.0.0-alpha-6" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Client\Blog3000.Client.csproj" />
+    <ProjectReference Include="..\Shared\Blog3000.Shared.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="app_data\posts\mh\legal.md">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="app_data\posts\mh\hello-world.md">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="wwwroot\-config.json" />
+  </ItemGroup>
+
+  <Target Name="PreBuild" BeforeTargets="PreBuildEvent">
+    <Exec Command="cmd.exe /c echo namespace Blog3000.Server  { &gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;&#xD;&#xA;cmd.exe /c echo public static class BuildVersion { &gt;&gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;&#xD;&#xA;cmd.exe /c echo public static string BUILD_DATE=&quot;%25date%25 %25time%25&quot;; &gt;&gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;&#xD;&#xA;cmd.exe /c echo }} &gt;&gt; &quot;$(ProjectDir)\BuildVersion.cs&quot;" />
+  </Target>
+
+  <ProjectExtensions><VisualStudio><UserProperties /></VisualStudio></ProjectExtensions>
+
+
+</Project>

Blog3000/Server/BlogEnv.cs

@@ -0,0 +1,164 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Server
+{
+    public class BlogEnv
+    {
+        private readonly IWebHostEnvironment env;
+        private readonly ILogger logger;
+
+        public BlogEnv(ILogger<BlogEnv> logger, IWebHostEnvironment env)
+        {
+            this.env = env;
+            this.logger = logger;
+
+            // Determin path, set in AppDomain-var (for legacy)
+            AppDataPath = BuildAppDataPath();
+
+            System.AppDomain.CurrentDomain.SetData("AppDataPath", AppDataPath);
+
+            logger.LogInformation($"Set AppDataPath={AppDataPath}");
+        }
+
+
+        public string AppDataPath { get; private set; }
+
+
+        private BlogConfigJson _configJson;
+        public BlogConfigJson BlogConfig
+        {
+            get
+            {
+                if (_configJson == null)
+                {
+                    try
+                    {
+                        //var path = env.WebRootFileProvider.GetFileInfo("config.json")?.PhysicalPath;
+                        _configJson = LoadConfig();
+                    }
+                    catch (Exception ex)
+                    {
+                        //logger.LogWarning($"Error reading wwwroot/config.json {ex}");
+                        logger.LogWarning($"Error reading blogconfig.json {ex}");
+                    }
+                }
+
+                return _configJson;
+            }
+        }
+
+
+        public static BlogConfigJson LoadConfig()
+        {
+            Console.WriteLine($"Loading blogconfig.json {GetCfgFilePath()}");
+            var txt = System.IO.File.ReadAllText(GetCfgFilePath());            
+            return JsonConvert.DeserializeObject<BlogConfigJson>(txt);
+        }
+
+
+        public static void SaveConfig(BlogConfigJson c)
+        {
+            var txt = JsonConvert.SerializeObject(c, Formatting.Indented);
+            System.IO.File.WriteAllText(GetCfgFilePath(), txt);
+        }
+
+
+        private static string BuildAppDataPath()
+        {
+            // Determin path, set in AppDomain-var (for legacy)
+            if (Program.blogDataPath == null)
+            {
+                //logger.LogInformation($"CurrentDir->{Environment.CurrentDirectory}");
+                //AppDataPath = System.IO.Path.Combine(env.ContentRootPath, "app_data");
+                return System.IO.Path.Combine(Environment.CurrentDirectory, "app_data");
+            }
+            else
+            {
+                return Program.blogDataPath;
+            }
+        }
+
+
+        private static string GetCfgFilePath()
+        {
+            return System.IO.Path.Combine(BuildAppDataPath(), "blogconfig.json");
+        }
+
+
+        public class BlogConfigJson: ClientConfigJson
+        {
+            public ClientConfigJson ToClientConfig()
+            {
+                return new ClientConfigJson
+                {
+                    Title = Title,
+                    DefaultEMailAddress = DefaultEMailAddress,
+                    AuthorFullnames = AuthorFullnames,
+                    TopTopics = TopTopics,
+                    SocialLinks = SocialLinks
+                };
+            }
+
+            //
+
+            public bool AllowSearchBots { get; set; }
+
+            public bool AllowSearchDevBot { get; set; }
+
+            public string SyslogAppName { get; set; }
+
+            public string PublicDlUri { get; set; }
+
+            public int? ListenPort { get; set; }
+
+            public string VisibleUrlPrefix { get; set; }
+
+            //
+
+            public ProtectedConfig Protected { get; set; }
+
+            public bool TwitterEnabled { get; set; }
+
+            public bool TwitterTestMode { get; set; }
+
+
+            public override string ToString()
+            {
+                return JsonConvert.SerializeObject(this, Formatting.Indented);
+
+            }
+        }
+
+
+
+        public class ProtectedConfig
+        {
+            public string TwitterAPIKey { get; set; }
+            public string TwitterAPISecret { get; set; }
+            public string TwitterAccessToken { get; set; }
+            public string TwitterAccessSecret { get; set; }
+
+        }
+
+
+        public class ClientConfigJson
+        {
+            public string Title { get; set; }
+            public string DefaultEMailAddress { get; set; }
+
+            public Dictionary<string, string> AuthorFullnames { get; set; }
+
+            public Dictionary<string, string> SocialLinks { get; set; }
+
+            public string[] TopTopics { get; set; }
+
+        }
+
+    }
+}

Blog3000/Server/BlogPostRepo.cs

@@ -0,0 +1,711 @@
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.Logging;
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using System.IO;
+using Blog3000.Server.MiddleWares;
+using System.Text.Json;
+using Microsoft.CodeAnalysis.CSharp;
+
+namespace Blog3000.Server
+{
+    public class BlogPostRepo
+    {
+        public event EventHandler BlogPostsChanged;
+
+        private static object updateLock = new object();
+        private static object idLock = new object();
+        private static long lastUsedTs;
+
+        private static int CACHETIMEOUTMINS = 5;
+        private static string BLOGPOSTKEY = "blog-posts-cache-key";
+        private static string BLOGPOSTUPDTIMEKEY = "blog-posts-upd-time-keycache-key";
+
+        private bool forceCacheUpdate = false;
+
+        private Dictionary<string, string> checksumsById = null;
+
+        private readonly string _blogPostPath;
+        private readonly string checksumCacheFile;
+
+        private readonly ILogger<BlogPostRepo> logger;
+        private readonly IMemoryCache cache;
+
+        public BlogPostRepo(ILogger<BlogPostRepo> logger, BlogEnv config, IMemoryCache cache)
+        {
+            this.logger = logger;
+            this.cache = cache;
+
+            this._blogPostPath = System.IO.Path.Combine(
+              //(string)AppDomain.CurrentDomain.GetData("AppDataPath"),
+              config.AppDataPath,
+              "posts");
+
+            this.checksumCacheFile = System.IO.Path.Combine(
+                //(string)AppDomain.CurrentDomain.GetData("AppDataPath"),
+                config.AppDataPath,
+                "checksumcache.json");
+
+            UpdateCache();
+        }
+
+
+        public string BlogPostRoot { get { return _blogPostPath; } }
+    
+
+
+
+        /// <summary>
+        /// CreateId based on timestamp + author.
+        /// - Time no allowed to go backwards, especially when Service not running
+        /// - Not multiinstance/multihosts aware       
+        /// </summary>
+        public static void CreateId(BlogPostHeader b)
+        {
+            if (String.IsNullOrEmpty(b.Id) && !String.IsNullOrEmpty(b.Author))
+            {
+                lock (idLock)
+                {
+                    var span = DateTime.UtcNow - new DateTime(2001, 1, 1);                    
+                    long ts = (long)(span.TotalMilliseconds / 10); // 1/10ms resolution
+                    if (ts <= lastUsedTs) // Time went backwards
+                    {
+                        ts = lastUsedTs + 1;
+                    }
+                    lastUsedTs = ts;
+                    b.Id = CreateId(b.Author, ts);
+                    System.Threading.Thread.Sleep(10);
+                }
+            }
+            else
+            {
+                throw new InvalidOperationException("Id already set or author missing");
+            }
+        }
+
+        public void ClearCache()
+        {
+            forceCacheUpdate = true;
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns>cached list of posts</returns>
+        public List<BlogPostHeader> GetHeaders()
+        {
+            List<BlogPostHeader> res = GetHeaderFromCache();
+            if (res == null)
+            {
+                res = UpdateCache();
+            }
+
+            return res;
+        }
+
+
+        public string GetSafeFilePath(BlogPostHeader b)
+        {
+            return GetSafeFilePath(b.Author, b.Filename);
+        }
+
+
+
+        public DateTime? GetFileModDate(BlogPostHeader b)
+        {
+            try
+            {
+                var p = GetSafeFilePath(b);
+                var res = System.IO.File.GetLastWriteTimeUtc(p);
+                return res;
+            }
+            catch (IOException ioex)
+            {
+                logger.LogWarning("Error gettime writetime of file", ioex);
+            }
+            return null;
+        }
+
+        
+        public string GetText(BlogPostHeader b)
+        {
+            var p = GetSafeFilePath(b);
+            var sb = new StringBuilder();
+            
+            bool skipMode = true;
+            try
+            {
+                foreach (var s in System.IO.File.ReadAllLines(p))
+                {
+                    if (skipMode && !s.StartsWith("@")) skipMode = false;
+                    if (!skipMode)
+                    {
+                        sb.AppendLine(s);
+                    }
+                }
+            }
+            catch (System.IO.IOException fex)
+            {
+                logger.LogWarning("Error reading file", fex);
+                return null;
+            }
+
+
+            return sb
+                .Replace("$PUBLICDL$", "PublicDl")
+                .ToString();
+        }
+
+        /// <summary>
+        /// Images for a given blogfn.md must reside in folder "blogfn-without-ext/fn"
+        /// </summary>
+        /// <param name="b"></param>
+        /// <param name="imgRef"></param>
+        /// <returns></returns>
+        public string GetImgPath(BlogPostHeader b, string imgRef)
+        {
+            string imgRelPath = null;
+            if (b.ImageRefs == null || !b.ImageRefs.TryGetValue(imgRef, out imgRelPath))
+            {
+                return null;
+            }
+
+            var p = GetSafeImgFilePath(b.Author, b.Filename, System.IO.Path.GetFileName(imgRelPath));
+            try
+            {
+                //var bytes = System.IO.File.ReadAllBytes(p);
+                //return bytes;
+                if (System.IO.File.Exists(p)) 
+                {
+                    return p;
+                }
+            }
+            catch (System.IO.IOException fex)
+            {
+                logger.LogWarning("Error reading file", fex);
+             
+            }
+            return null;
+        }
+
+
+        private BlogPostHeader FromFile(string f)
+        {
+            BlogPostHeader res = null;
+            
+            if (f != null)
+            {
+                bool isDraft = false;
+
+                using (var stream = System.IO.File.OpenText(f))
+                {
+                    string s = null;
+                    
+                    while ((s = stream.ReadLine()) != null)
+                    {
+                        if (s.StartsWith("@")) // Meta-headers without parameter 
+                        {
+                            var parts = s.Split(':', 2);
+                            if (parts.Length == 1)
+                            {
+                                switch (parts[0])
+                                {
+                                    case "@Draft":
+                                        isDraft = true;
+                                        break;
+                                    case "@NoSocialMediaInfo":
+                                        res.NoSocialMediaInfo = true;
+                                        break;
+                                }
+                            }
+                            else if (parts.Length == 2) // Meta-Headers with parameters
+                            {
+                                if (res == null) res = new BlogPostHeader();
+                                res.Filename = System.IO.Path.GetFileName(f);
+
+                                switch (parts[0])
+                                {
+                                    case "@Draft":
+                                        isDraft = true;
+                                        break;
+                                    case "@Id":
+                                        res.Id = parts[1];
+                                        break;
+                                    case "@Lang":
+                                        var rr = parts[1];
+                                        if (!String.IsNullOrEmpty(rr))
+                                        {
+                                            res.Lang = rr.ToLowerInvariant();
+                                        }
+                                        break;
+                                    case "@Title":
+                                        res.Title = parts[1];
+                                        break;
+                                    case "@Author":
+                                        res.Author = parts[1];
+                                        break;
+                                    case "@Abstract":
+                                        res.Abstract = parts[1];
+                                        break;
+                                    case "@Access":
+                                        res.Access = parts[1];
+                                        break;
+                                    case "@StickyMenuPos":
+                                        int pos;
+                                        if (Int32.TryParse(parts[1], out pos))
+                                        {
+                                            res.StickyMenuPos = pos;
+                                        }
+                                        break;
+                                    case "@Topics":
+                                        res.Topics = new List<string>((parts[1] ?? "").Split("|"));
+                                        break;
+                                    case "@Revision":
+                                        var p = (parts[1] ?? "").Split("|");
+                                        try
+                                        {
+                                            Revision r = new Revision();
+                                            if (p.Length >= 1)
+                                            {
+                                                DateTime dt;
+                                                if (DateTime.TryParse(p[0], out dt))
+                                                {
+                                                    r.ChangedAt = dt;
+                                                }
+                                            }
+                                            r.Description = p.Length > 1 ? p[1] : null;
+                                            r.Author = p.Length > 2 ? p[2] : null;
+                                            res.Revisions ??= new List<Revision>();
+                                            res.Revisions.Add(r);
+                                        }
+                                        catch (Exception)
+                                        {
+                                            logger.LogWarning($"Error parsing Revision on file {f}");
+                                        }
+
+                                        break;
+                                }
+                            }
+                        }
+                        else if (s.StartsWith("[")) // ImageRefs
+                        {
+                            var match = Regex.Match(s, @"\[(.+)\]:(.+)");
+                            if (match.Success && match.Groups.Count > 2)
+                            {
+                                res.ImageRefs ??= new Dictionary<String, String>();
+                                res.ImageRefs.Add(match.Groups[1].Value.Trim(), match.Groups[2].Value.Trim());
+                            }
+                            //
+                        }
+                        else if (!String.IsNullOrWhiteSpace(s)) // Non-empty string
+                        {
+                            // End of header+imagerefs
+                            break;
+                        }
+                    }
+                }
+
+                if (!isDraft)
+                {
+                    bool rewriteRevisions = false;
+                    if ((res.Revisions?.Count ?? 0) == 0)
+                    {
+                        res.Revisions ??= new List<Revision>();
+                        var r = new Revision();
+                        r.Description = "Initial";
+                        res.Revisions.Add(r);
+                    }
+
+                    foreach (var r in res.Revisions)
+                    {
+                        if (String.IsNullOrWhiteSpace(r.Author) && (!String.IsNullOrWhiteSpace(res.Author)))
+                        {
+                            r.Author = res.Author;
+                            rewriteRevisions = true;
+                        }
+
+                        if (r.ChangedAt == null)
+                        {
+                            r.ChangedAt ??= DateTime.UtcNow;
+                            rewriteRevisions = true;
+                        }
+                    }
+
+
+                    bool rewriteId = false;
+                    if (String.IsNullOrEmpty(res.Id) && !String.IsNullOrWhiteSpace(res.Author))
+                    {
+                        CreateId(res);
+                        rewriteId = true;
+                    }
+
+                    if (rewriteId || rewriteRevisions)
+                    {
+                        var lines = new List<string>(System.IO.File.ReadAllLines(f));
+                        var outlines = new List<string>();
+                        outlines.Add($"@Id:{res.Id}");
+                        foreach (var r in res.Revisions)
+                        {
+                            outlines.Add($"@Revision:{r.ChangedAt}|{r.Description}|{r.Author}");
+                        }
+                        bool outOfHeader = false;
+                        foreach (var ln in lines)
+                        {
+                            if (!outOfHeader)
+                            {
+                                if (ln.StartsWith("@Id") || (ln.StartsWith("@Revision"))) continue;
+                                if (!ln.StartsWith("@")) outOfHeader = true;
+                            }
+                            outlines.Add(ln);
+                        }
+                        System.IO.File.WriteAllLines(f, outlines, Encoding.UTF8);
+                    }
+                }
+
+
+                if (!isDraft && BlogPostHeader.IsUsable(res))
+                {
+                    res.Checksum = CalcCheckSum(res);
+                }
+                else
+                {
+                    res = null;
+                }
+            }
+
+            return res;
+        }
+
+
+        #region Caching stuff 
+
+
+        /// <summary>
+        /// Returns content of cache, updates cache if required
+        /// </summary>        
+        private List<BlogPostHeader> GetHeaderFromCache()
+        {
+            List<BlogPostHeader> res = null;
+            
+            if (forceCacheUpdate)
+            {
+                lock(updateLock)
+                {
+                    if (forceCacheUpdate) // Cache still needs update?
+                    {
+                        UpdateCache();
+                    }
+                }
+            }
+
+            if (cache.TryGetValue(BLOGPOSTKEY, out res))
+            {
+                if (IsCacheExpired())
+                {
+                    lock (updateLock)
+                    {
+                        // Recheck if cache is still expired after we acquired lock
+                        if (IsCacheExpired())
+                        {
+                            res = UpdateCache();
+                        }
+                    }
+                }
+            }
+
+            return res;
+        }
+
+
+        private bool IsCacheExpired()
+        {
+            DateTime dt;
+            if (cache.TryGetValue(BLOGPOSTUPDTIMEKEY, out dt))
+            {
+                if (dt != null && dt.AddMinutes(CACHETIMEOUTMINS).CompareTo(DateTime.UtcNow) < 0)
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns>The new data</returns>
+        internal List<BlogPostHeader> UpdateCache()
+        {
+            lock (updateLock)
+            {
+                logger.LogWarning($"Updating BlogPostCache");
+                var res = new List<BlogPostHeader>();                
+
+                foreach (var s in System.IO.Directory.GetFiles(
+                    BlogPostRoot,
+                    "*.md",
+                    System.IO.SearchOption.AllDirectories)
+                    )
+                {
+                    var be = FromFile(s);
+                    if (be != null)
+                    {
+                        res.Add(be);
+                    }
+                    else
+                    {
+                        logger.LogWarning($"Post {s} not usable");
+                    }
+                }
+
+
+                cache.Set(BLOGPOSTKEY, res);
+                cache.Set(BLOGPOSTUPDTIMEKEY, DateTime.UtcNow);
+                forceCacheUpdate = false;
+
+                // Compare with cached checksum for changes
+                bool hasChanges = false;
+                bool newChache = false;
+
+                if (checksumsById == null)
+                {
+                    checksumsById = LoadCheckSumsById();
+                    if (checksumsById == null)
+                    {
+                        checksumsById = new Dictionary<string, string>();
+                        newChache = true;
+                    }
+                }
+
+                var dcCopy = new Dictionary<string, string>(checksumsById ?? new Dictionary<string, string>());
+                foreach (var bp in res)
+                {
+                    string cs = null;
+                    if (dcCopy.TryGetValue(bp.Id, out cs))
+                    {
+                        if (!String.Equals(cs, bp.Checksum))
+                        {
+                            hasChanges = true;
+                            break;
+                        }
+                        dcCopy.Remove(bp.Id);
+                    }
+                    else
+                    {
+                        hasChanges = true;
+                        break;
+                    }
+                }
+                if (dcCopy.Count > 0)
+                {
+                    hasChanges = true;
+                }
+
+                // Write new id/checksum dict
+                var dc = new Dictionary<string, string>();
+                foreach (var bp in res)
+                {
+                    dc.Add(bp.Id, bp.Checksum);
+                }
+                checksumsById = dc;
+                SaveCheckSumsById(checksumsById);
+
+                // Notify listenera about changes
+                if (hasChanges)
+                {
+                    if (newChache)
+                    {
+                        logger.LogWarning("BlogPosts changed, but new or bad cache, not notifying listeners");
+                    }
+                    else
+                    {
+                        logger.LogInformation("BlogPosts changed, notifying listeners");
+                        BlogPostsChanged?.Invoke(this, EventArgs.Empty);
+                    }
+                }
+                else
+                {
+                    logger.LogInformation("BlogPosts not changed, not notifying listeners");
+                }
+
+                return res;
+            }
+        }
+
+
+        #endregion
+
+
+        #region File+Path utils
+
+        private string GetSafeFilePath(string author, string filename)
+        {
+           
+            var at = CheckPathPart(author);
+            var fn = CheckPathPart(filename);
+
+            return System.IO.Path.Combine(BlogPostRoot, at, fn);
+        }
+
+        private string GetSafeImgFilePath(string author, string blogFilenmame, string imgFilename)
+        {           
+            var at = CheckPathPart(author);
+            var bt = System.IO.Path.GetFileNameWithoutExtension(CheckPathPart(blogFilenmame));
+            var it = CheckPathPart(imgFilename);
+
+            return System.IO.Path.Combine(BlogPostRoot, at, bt, it);
+        }
+
+
+        private static string CheckPathPart(string part)
+        {
+            if (String.IsNullOrWhiteSpace(part))
+            {
+                throw new ArgumentException($"null or empty?");
+            }
+
+            var pt = System.IO.Path.GetFileName(part.Trim());
+            if (!String.Equals(part, pt))
+            {
+                throw new ArgumentException($"contains invalid path-information?");
+            }
+            return pt;
+        }
+
+
+        #endregion
+
+
+
+        private string CalcCheckSum(BlogPostHeader b)
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.Append(b.Id ?? "");
+            sb.Append("|");
+            sb.Append(b.Filename ?? "");
+            sb.Append("|");
+            //sb.Append(res.Title ?? "");
+            //sb.Append("|");
+            //sb.Append(res.Author ?? "");
+            //sb.Append("|");
+            //sb.Append(res.Access ?? "");
+            //sb.Append("|");
+            //res.Topics.ForEach(t => sb.Append(t + ","));
+            //sb.Append(res.Revisions?.Count ?? 0);
+            //sb.Append("|");
+            //sb.Append(res.Abstract ?? "");
+            //sb.Append("|");
+            //sb.Append(res.StickyMenuPos ?? -1);
+            //sb.Append("|");
+            if (b.ImageRefs != null)
+            {
+                foreach (var fn in b.ImageRefs.Values.OrderBy(s => s))
+                {
+                    var fno = System.IO.Path.GetFileName(fn);
+                    var rfp = GetSafeImgFilePath(b.Author, b.Filename, fno);
+                    var bytes = new byte[] { };
+                    try
+                    {
+                        bytes = System.IO.File.ReadAllBytes(rfp);
+                    }
+                    catch (System.IO.IOException ex)
+                    {
+                        logger.LogWarning($"ImgFile {rfp} not readable");
+                    }
+                    var sha = System.Convert.ToBase64String(
+                        System.Security.Cryptography.SHA256.Create().ComputeHash(bytes)
+                        );
+                    sb.Append(sha);
+                    sb.Append(";");
+                }
+            }
+
+            var f = GetSafeFilePath(b.Author, b.Filename);
+            sb.Append(System.IO.File.ReadAllText(f));
+
+            return
+                System.Convert.ToBase64String(
+                    System.Security.Cryptography.SHA256.Create().ComputeHash(
+                       System.Text.Encoding.UTF8.GetBytes(sb.ToString())
+                    )
+                ); ;
+        }
+
+
+        private Dictionary<string, string> LoadCheckSumsById()
+        {
+            Dictionary<string, string> res = null;
+            try
+            {
+                if (System.IO.File.Exists(checksumCacheFile))
+                {
+                    var text = System.IO.File.ReadAllText(checksumCacheFile);
+                    res = JsonSerializer.Deserialize<Dictionary<string, string>>(text);
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, $"Error reading checksumcache file ${checksumCacheFile}");
+            }
+
+            return res;
+
+        }
+
+
+        private bool SaveCheckSumsById(Dictionary<string, string> cbcById)
+        {
+            cbcById ??= new Dictionary<string, string>();
+
+            try
+            {
+                var text = JsonSerializer.Serialize(cbcById);
+                System.IO.File.WriteAllText(checksumCacheFile, text);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, $"Error writing checksumCache file ${checksumCacheFile}");
+            }
+
+            return false;
+        }
+
+
+        private static string CreateId(string author, long ts)
+        {
+            const string radixChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefhijklmnopqrstuvwxyz";
+
+          
+            string res = "";
+
+            void radixer(long l, ref string res)
+            {                
+                do
+                {
+                    var r = l % radixChars.Length;
+                    res = radixChars[(int)r] + res;
+                    l = (l - r) / radixChars.Length;
+
+                }
+                while (l > 0);
+            }
+            
+            radixer(ts, ref res);
+            
+            var authorPrefixBytes = System.Text.Encoding.UTF8.GetBytes(author);
+            foreach (var b in authorPrefixBytes)
+            {
+                radixer(b, ref res);
+            }
+
+            return res;
+        }
+
+    }
+}

Blog3000/Server/BuildVersion.cs

@@ -0,0 +1,4 @@
+namespace Blog3000.Server  { 
+public static class BuildVersion { 
+public static string BUILD_DATE="03.10.2020 20:24:15,77"; 
+}} 

Blog3000/Server/Controllers/BlogPostsController.cs

@@ -0,0 +1,161 @@
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Caching.Memory;
+using System.Text;
+using System.IO;
+using Microsoft.AspNetCore.StaticFiles;
+
+namespace Blog3000.Server.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class BlogPostsController : ControllerBase
+    {
+    
+        private readonly ILogger<BlogPostsController> logger;     
+        private readonly BlogPostRepo blogPostRepo;
+
+        public BlogPostsController(ILogger<BlogPostsController> logger, BlogPostRepo blogPostRepo)
+        {
+            this.logger = logger;
+            this.blogPostRepo = blogPostRepo;            
+        }
+
+
+
+
+        [HttpGet]
+        public ActionResult<IEnumerable<BlogPostHeader>> GetHeaders()
+        {
+            logger.LogInformation($"BlogPosts|{HttpContext.Connection.RemoteIpAddress}|GetHeaders");
+
+            var res = blogPostRepo.GetHeaders();
+
+            return new ActionResult<IEnumerable<BlogPostHeader>>(res.Where(s => "PUBLIC".Equals(s.Access)));
+        }
+
+
+
+        [HttpGet("{id}")]
+        public ActionResult<BlogPost> GetPost(String id)
+        {
+            logger.LogInformation($"BlogPosts|{HttpContext.Connection.RemoteIpAddress}|GetHeader|{id}");
+
+            if (String.IsNullOrWhiteSpace(id))
+            {
+                return BadRequest("id");
+            }
+            var posts = blogPostRepo.GetHeaders();
+
+            // Check accessibilty
+            var post = posts
+                .Where(s => "PUBLIC".Equals(s.Access))
+                .Where(s => id.Equals(s.Id))
+                .FirstOrDefault();
+
+            if (post == null)
+            {
+                return NotFound("id");
+            }
+
+            var res = blogPostRepo.GetText(post);
+            if (res == null)
+            {
+                return NotFound("id/text");
+            }
+
+            var bpt = BlogPost.FromBlogPost(post);
+            bpt.Text = res;
+
+            return bpt;
+        }
+
+
+
+
+
+        [HttpGet("{id}/imgref/{imgRef}")]
+        public ActionResult<byte[]> GetImage(String id, String imgRef)
+        {
+            logger.LogInformation($"BlogPosts|{HttpContext.Connection.RemoteIpAddress}|GetImage|{id}|{imgRef}");
+
+            if (String.IsNullOrWhiteSpace(id))
+            {
+                return BadRequest("id");
+            }
+
+            if (String.IsNullOrWhiteSpace(imgRef))
+            {
+                return BadRequest("imgRef");
+            }
+            var posts = blogPostRepo.GetHeaders();
+
+            // Check accessibilty
+            var post = posts
+                .Where(s => "PUBLIC".Equals(s.Access))
+                .Where(s => id.Equals(s.Id))
+                .FirstOrDefault();
+
+            if (post == null)
+            {
+                return NotFound("id");
+            }
+
+            var pp = blogPostRepo.GetImgPath(post, imgRef);
+
+            if (pp == null)
+            {
+                return NotFound("id/ref");
+            }
+            var fn = System.IO.Path.GetFileName(pp)?.ToLowerInvariant();
+            //sring mimeType = MimeMapping.GetMimeMapping(fileName) ?? "image/jpeg";
+            string mime;
+            new FileExtensionContentTypeProvider().TryGetContentType(fn, out mime);
+
+            //var ext = System.IO.Path.GetExtension(pp)?.ToLowerInvariant();
+            //var mime = "image/jpeg";
+            //if ((ext != null) && !(".jpg".Equals(ext))) {
+            //    mime = "image/"+ext.Substring(1);
+            //}
+            return PhysicalFile(pp, $"{mime}");
+        }
+
+
+
+        [HttpGet("search")]
+        public async Task<ActionResult<List<string>>> SearchAsync(string searchTerm, int startIdx=0, int pageMaxSize=20, bool findLastPage=false)
+        {
+            logger.LogInformation($"BlogPosts|{HttpContext.Connection.RemoteIpAddress}|Search|{searchTerm}");
+
+            async IAsyncEnumerable<BlogPostHeader>  GetHeaders()
+            {
+                foreach(var p in blogPostRepo.GetHeaders())
+                {
+                    await Task.Yield();
+                    yield return p;
+                }
+            }
+
+            async IAsyncEnumerable<BlogPost> GetPosts()
+            {
+                foreach (var p in blogPostRepo.GetHeaders())
+                {
+                    
+                    await Task.Yield();
+                    var bt = BlogPost.FromBlogPost(p);
+                    bt.Text = blogPostRepo.GetText(p);
+                    yield return bt;
+                }
+            }
+
+            var bps = new BlogPostSearch(() => GetPosts(), () => GetHeaders(), searchTerm);
+            var posts = await bps.ExecAsync(startIdx, pageMaxSize, findLastPage);
+            return posts.Select(c => c.Id).ToList();            
+        }
+    }
+}

Blog3000/Server/Controllers/ConfigController.cs

@@ -0,0 +1,45 @@
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Caching.Memory;
+using System.Text;
+using System.IO;
+using Microsoft.AspNetCore.StaticFiles;
+using static Blog3000.Server.BlogEnv;
+
+namespace Blog3000.Server.Controllers
+{
+    [ApiController]
+    [Route("/config.json")]
+    public class ConfigController : ControllerBase
+    {
+
+        private readonly ILogger<BlogPostsController> logger;
+        private readonly BlogEnv config;
+
+        public ConfigController(ILogger<BlogPostsController> logger, BlogEnv config)
+        {
+            this.logger = logger;
+            this.config = config;
+        }
+
+
+
+
+        [HttpGet]
+        public ActionResult<ClientConfigJson> Get()
+        {
+            logger.LogInformation($"Config|{HttpContext.Connection.RemoteIpAddress}|Get");
+
+            var r= config.BlogConfig.ToClientConfig();
+            return r;
+        }
+
+    }
+
+
+}

Blog3000/Server/Controllers/PublicDlController.cs

@@ -0,0 +1,133 @@
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Caching.Memory;
+using System.Text;
+using System.IO;
+using Microsoft.AspNetCore.StaticFiles;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Blog3000.Client;
+using System.Text.Json;
+using System.Xml.Linq;
+using System.Threading;
+
+namespace Blog3000.Server.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class PublicDlController : ControllerBase
+    {
+
+        private readonly ILogger<BlogEnv> blogEnv;
+        private readonly ILogger<BlogPostsController> logger;
+
+        private readonly string redirectPrefix;
+        //private readonly string dlPath;
+
+        private static readonly SemaphoreSlim myLock = new SemaphoreSlim(1);
+        
+        public PublicDlController(ILogger<BlogPostsController> logger, BlogEnv blogEnv)
+        {
+            this.logger = logger;
+
+            if (!String.IsNullOrWhiteSpace(blogEnv.BlogConfig.PublicDlUri))
+            {
+                try
+                {
+                    Uri u = new Uri(blogEnv.BlogConfig.PublicDlUri);
+                    //if ("file".Equals(u.Scheme))
+                    //{
+                    //    dlPath = u.AbsolutePath;
+                    //}
+                    //else
+                    {
+                        redirectPrefix = blogEnv.BlogConfig.PublicDlUri;
+                    }
+                }
+                catch(Exception ex)
+                {
+                    logger.LogWarning("Error parsing Program.publicDlUrl: " + ex.ToString());
+                }
+            }
+        }
+
+
+        [HttpGet("{file}")]
+        public async Task<ActionResult<Dictionary<string, int>>> GetAsync(string file)
+        {
+            logger.LogInformation($"PublicDl|{HttpContext.Connection.RemoteIpAddress}|GetAsync|{file}");
+
+            // TODO: Implmenent download counter            
+
+            try
+            {
+                var fn = System.IO.Path.GetFileName(file);
+
+                if (!String.IsNullOrWhiteSpace(redirectPrefix))
+                {
+                    // TODO: How to prevent logging bad file requests (logging unknown files, etc)
+                    // -> Check if in Db, otherwise probe target url (range-dl 1 byte, modified?)
+                    return Redirect($"{redirectPrefix}/{fn}");
+                }
+                //else if (!String.IsNullOrWhiteSpace(dlPath))
+                //{
+                //    var path = System.IO.Path.Combine(dlPath, fn);
+                //    var stream = System.IO.File.OpenRead(path);
+                //    // File exists, can be logged
+
+                //    return new FileStreamResult(stream, "application/octect-stream")
+                //    {
+                //        FileDownloadName = fn
+                //    };
+                //}
+                else
+                {
+                    logger.LogWarning($"PublicDl|{HttpContext.Connection.RemoteIpAddress}|Local download not ^configured");
+                    return StatusCode(500);
+                }
+            }
+            catch(IOException ioex)
+            {
+                logger.LogWarning($"PublicDl|{HttpContext.Connection.RemoteIpAddress}|{ioex.Message}");
+                return StatusCode(400);
+            }                        
+        }
+
+
+
+        [HttpGet("{file}/getredirurl")]
+        public ActionResult<string> Get(string file)
+        {
+            logger.LogInformation($"PublicDlGetUrl|{HttpContext.Connection.RemoteIpAddress}|GetAsync|{file}");
+
+            // TODO: Implmenent download counter
+
+            try
+            {
+               
+                if (!String.IsNullOrWhiteSpace(redirectPrefix))
+                {
+                    // TODO: How to prevent logging bad file requests (logging unknown files, etc)
+                    // -> Check if in Db, otherwise probe target url (range-dl 1 byte, modified?)
+                    var fn = System.IO.Path.GetFileName(file);
+                    return $"{redirectPrefix}/{fn}";
+
+                }               
+                else
+                {
+                    logger.LogWarning($"PublicDlGetUrl|{HttpContext.Connection.RemoteIpAddress}|Local download not ^configured");
+                    return StatusCode(500);
+                }
+            }
+            catch (IOException ioex)
+            {
+                logger.LogWarning($"PublicDlGetUrl|{HttpContext.Connection.RemoteIpAddress}|{ioex.Message}");
+                return StatusCode(400);
+            }
+        }
+    }
+}

Blog3000/Server/Controllers/ViewStatsController.cs

@@ -0,0 +1,136 @@
+using Blog3000.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Caching.Memory;
+using System.Text;
+using System.IO;
+using Microsoft.AspNetCore.StaticFiles;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Blog3000.Client;
+using System.Text.Json;
+using System.Xml.Linq;
+using System.Threading;
+
+namespace Blog3000.Server.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class ViewStatsController : ControllerBase
+    {
+    
+        private readonly ILogger<BlogPostsController> logger;     
+        private readonly BlogPostRepo blogPostRepo;        
+
+        private readonly string statsFile;
+
+        private static readonly SemaphoreSlim myLock = new SemaphoreSlim(1);
+        
+        public ViewStatsController(ILogger<BlogPostsController> logger, BlogPostRepo blogPostRepo)
+        {
+            this.logger = logger;
+            this.blogPostRepo = blogPostRepo;            
+
+            statsFile = System.IO.Path.Combine(
+              (string)AppDomain.CurrentDomain.GetData("AppDataPath"),
+              "stats.json");
+        }
+
+
+        [HttpGet]
+        public async Task<ActionResult<Dictionary<string, int>>> GetAsync()
+        {
+            logger.LogInformation($"ViewStats|{HttpContext.Connection.RemoteIpAddress}|GetAsync");
+
+            await myLock.WaitAsync();
+            try 
+            {
+                var res = await LoadAsync();
+                return res;
+            }
+            finally
+            {
+                myLock.Release();
+            }
+        }
+
+
+        [HttpPost]
+        public async Task <ActionResult<Dictionary<string, int>>> PostAsync(Dictionary<string, int> newStats)
+        {
+            // Only add 1 view for each read post to prevent user manipulating stats to much
+            // Ignoew unknwon posts
+
+            logger.LogInformation($"ViewStats|{HttpContext.Connection.RemoteIpAddress}|PostAsync");
+            await myLock.WaitAsync();
+            try
+            {
+                var stats = await LoadAsync();
+                foreach (var k in newStats.Keys)
+                {
+                    if (blogPostRepo.GetHeaders().FirstOrDefault(p => p.Id.Equals(k)) != null)
+                    {
+                        int nv;
+                        stats.TryGetValue(k, out nv);
+                        nv++;
+                        stats.Remove(k);
+                        stats.Add(k, nv);
+                    }
+                }
+                await SaveAsync(stats);
+                return stats;
+            }
+            finally
+            {
+                myLock.Release();
+            }
+        }
+
+        private async Task<Dictionary<String, int>> LoadAsync()
+        {
+            Dictionary<string, int> res = null;
+
+            try
+            {
+                if (System.IO.File.Exists(statsFile))
+                {
+                    var text = await System.IO.File.ReadAllTextAsync(statsFile);
+                    res = JsonSerializer.Deserialize<Dictionary<string, int>>(text);
+                }
+            }
+            catch(Exception ex)
+            {
+                logger.LogWarning(ex, $"Error reading stats file ${statsFile}");
+            }
+
+            return res ?? new Dictionary<string, int>();
+
+        }
+
+
+        private async Task<bool> SaveAsync(Dictionary<string, int> stats)
+        {
+            stats ??= new Dictionary<string, int>();
+
+            try
+            {
+                var text = JsonSerializer.Serialize(stats);
+                await System.IO.File.WriteAllTextAsync(statsFile, text);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, $"Error writing stats file ${statsFile}");
+            }
+
+            return false;
+        }
+
+
+
+
+    }
+}

Blog3000/Server/Controllers/WeatherForecastController.cs

@@ -0,0 +1,40 @@
+//using NanoBlog.Shared;
+//using System;
+//using System.Collections.Generic;
+//using System.Linq;
+//using System.Threading.Tasks;
+//using Microsoft.AspNetCore.Mvc;
+//using Microsoft.Extensions.Logging;
+
+//namespace NanoBlog.Server.Controllers
+//{
+//    [ApiController]
+//    [Route("[controller]")]
+//    public class WeatherForecastController : ControllerBase
+//    {
+//        private static readonly string[] Summaries = new[]
+//        {
+//            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+//        };
+
+//        private readonly ILogger<WeatherForecastController> logger;
+
+//        public WeatherForecastController(ILogger<WeatherForecastController> logger)
+//        {
+//            this.logger = logger;
+//        }
+
+//        [HttpGet]
+//        public IEnumerable<WeatherForecast> Get()
+//        {
+//            var rng = new Random();
+//            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
+//            {
+//                Date = DateTime.Now.AddDays(index),
+//                TemperatureC = rng.Next(-20, 55),
+//                Summary = Summaries[rng.Next(Summaries.Length)]
+//            })
+//            .ToArray();
+//        }
+//    }
+//}

Blog3000/Server/MiddleWares/BlogPostRepoUpdater.cs

@@ -0,0 +1,61 @@
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Blog3000.Server
+{
+      
+
+    internal class BlogPostRepoUpdater : IHostedService, IDisposable
+    {
+
+        private readonly ILogger logger;
+        private readonly BlogPostRepo repo;
+
+        private Timer timer;
+
+        public BlogPostRepoUpdater(ILogger<BlogPostRepoUpdater> logger, BlogPostRepo repo)
+        {
+            this.logger = logger;
+            this.repo = repo;
+
+        }
+
+        public void Dispose()
+        {
+            timer?.Dispose();
+        }
+
+
+        public Task StartAsync(CancellationToken cancellationToken)
+        {
+            logger.LogInformation("BlogPostRepoUpdater Service starting...");
+
+            // Time so cache should never be expired, when a request comes in
+            timer = new Timer(DoWork, null, TimeSpan.Zero, TimeSpan.FromSeconds(5*60-30));
+
+            return Task.CompletedTask;
+        }
+
+        public Task StopAsync(CancellationToken cancellationToken)
+        {
+            logger.LogInformation("BlogPostRepoUpdater Service stopping."); 
+
+            timer?.Dispose();
+            timer = null;
+
+            return Task.CompletedTask;
+        }
+
+        private void DoWork(object state)
+        {
+            logger.LogInformation("BlogPostRepoUpdater updating BlogPostRepo");
+
+            repo.UpdateCache();
+        }
+    }
+}

Blog3000/Server/MiddleWares/NoCacheHeaderAdder.cs

@@ -0,0 +1,41 @@
+using Microsoft.AspNetCore.Http;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Server.MiddleWares
+{
+    public class NoCacheHeaderAdder
+    {
+        private string[] urls;
+
+        public NoCacheHeaderAdder(string[] urls)
+        {
+            this.urls = urls;
+        }
+
+        public void Process(HttpContext context)
+        {
+            var p = context.Request.Path.ToString().ToLowerInvariant();
+
+            bool noCache = false;
+            foreach (var u in urls)
+            {
+                if (p.StartsWith(u))
+                {
+                    noCache = true;
+                    break;
+                }
+            }
+
+            if (noCache)
+            {
+                context.Response.Headers.Add("Pragma", "no-cache"); // HTTP1.0
+                context.Response.Headers.Add("Cache-Control", "no-cache, must-revalidate"); // HTTP1.1
+            }
+
+
+        }
+    }
+}

Blog3000/Server/MiddleWares/SEOMgr.cs

@@ -0,0 +1,360 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Primitives;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Net;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Ganss.XSS;
+using System.IO;
+using Markdig;
+using Markdig.Syntax;
+using Blog3000.Shared;
+using Microsoft.Extensions.Logging;
+using AngleSharp;
+using System.Net.Http;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Blog3000.Client;
+
+namespace Blog3000.Server.MiddleWares
+{
+    public class SEOMgr: IDisposable
+    {        
+        private readonly ILogger logger;
+        private readonly BlogEnv blogEnv;
+        private readonly BlogPostRepo blogPostRepo;
+        
+        private readonly string urlPrefix;
+
+        private readonly static object siteMapLock = new object();
+        private readonly string sitemapCacheFile;
+        private string siteMapCache;
+
+        //
+        // Update when SEO-Output changes
+        //
+        private static DateTime MINSEODATE = new DateTime(2020, 07, 03);
+
+        public SEOMgr(ILogger<SEOMgr> logger, BlogEnv blogEnv, BlogPostRepo blogPostRepo)
+        {
+            this.logger = logger;
+            this.blogEnv = blogEnv;
+            this.blogPostRepo = blogPostRepo;
+            this.urlPrefix = blogEnv.BlogConfig.VisibleUrlPrefix;
+
+            this.sitemapCacheFile = System.IO.Path.Combine(
+                (string)AppDomain.CurrentDomain.GetData("AppDataPath"),
+                "sitemapcache.xml");
+
+            blogPostRepo.BlogPostsChanged += BlogPostRepo_BlogPostsChanged;
+            BlogPostRepo_BlogPostsChanged(null, null);
+        }
+
+
+        public void Dispose()
+        {
+            blogPostRepo.BlogPostsChanged -= BlogPostRepo_BlogPostsChanged;            
+        }
+
+
+        public string GetSiteMap()
+        {
+            if (siteMapCache == null)
+            {
+                UpdateSiteMap();
+            }
+
+            return siteMapCache;
+        }
+
+
+        public StringBuilder BuildBlogPostOutput(BlogPostHeader bp)
+        {
+            string markdown = blogPostRepo.GetText(bp);
+            
+            var title =  InputSanitizer.Default.SanitizeText(bp.Title, true);
+            var keywords = "";
+            if (bp.Topics != null)
+            {
+                foreach (var t in bp.Topics)
+                {
+                    keywords += (t.Replace("'", "").Replace("#", "")) + ","; // TODO
+                }
+            }
+            keywords = InputSanitizer.Default.SanitizeText(keywords);
+
+            var abstr = "" + bp.Abstract;
+            abstr = InputSanitizer.Default.SanitizeText(abstr, true).Replace("'", "");  // TODO
+
+            string author = null;
+            if (!String.IsNullOrEmpty(bp.Author))
+            {
+                blogEnv.BlogConfig?.AuthorFullnames?.TryGetValue(bp.Author, out author);
+                author = InputSanitizer.Default.SanitizeText(author, true);
+            }
+
+
+            var mdPipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+            var mdoc = Markdig.Markdown.Parse(markdown, mdPipeline);
+
+
+            // Extract imagerefs for rewriting
+            Dictionary<string, string> imgGeysByUrls = new Dictionary<string, string>();
+            foreach (var r in mdoc.GetLinkReferenceDefinitions().Links)
+            {
+                if (r.Value != null && r.Value.Url != null)
+                {
+                    imgGeysByUrls.Add(r.Value.Url, r.Key);
+                }
+            }
+
+
+            // Render markdown, rewrite image-urls
+            var writer = new StringWriter();
+            var renderer = new Markdig.Renderers.HtmlRenderer(writer);
+            renderer.LinkRewriter += (a) =>
+            {
+                string imgKey;
+                if (imgGeysByUrls.TryGetValue(a, out imgKey))
+                {
+                    return $"BlogPosts/{bp.Id}/imgref/{a}";
+                }
+                return a;
+            };
+            mdPipeline.Setup(renderer);
+            renderer.Render(mdoc);
+
+            // Create sanitzed html
+            var html = writer.ToString();            
+            html = InputSanitizer.Default.SanitizeHtml(html);
+
+            var lang = "en";
+            if (!String.IsNullOrEmpty(bp.Lang))
+            {
+                lang = InputSanitizer.Default.SanitizeText(bp.Lang);
+            }
+
+            // Build final document
+            StringBuilder sb = new StringBuilder();
+            sb.AppendLine("");
+            sb.AppendLine($"<html lang='{lang}'>");
+            sb.AppendLine("<head>");
+            sb.AppendLine($"<title>{title}</title>");
+            sb.AppendLine("<meta charset='UTF-8'/>");
+            sb.AppendLine("<meta name='viewport' content='width=device-width, initial-scale=1.0'>");
+            sb.AppendLine($"<meta name='generator' content='blog3000 build:{BuildVersion.BUILD_DATE}'>");
+            sb.AppendLine($"<meta name='description' content='{abstr}'></meta>");
+            sb.AppendLine($"<meta name='keywords' content='{keywords}'></meta>");
+            if (!String.IsNullOrEmpty(author))
+            {
+                sb.AppendLine($"<meta name='author' content='{author}'></meta>");
+            }
+            sb.AppendLine("</head>");
+            sb.AppendLine("<body>");
+            sb.AppendLine($"<h1>{title}</h1>");
+            sb.AppendLine($"<hr/>");
+            sb.AppendLine($"<div><i>Abstract: {abstr}</i></div>");
+            if (!String.IsNullOrEmpty(author))
+            {
+                sb.AppendLine($"<div><i>Author: {author}</i></div>");
+            }
+            sb.AppendLine("<hr/>");
+            sb.AppendLine(html);            
+            sb.AppendLine("</body></html>");
+
+            return sb;
+        }
+
+
+
+
+        private string CreateSitemap()
+        {
+            // Create list with blogpost-links
+            StringBuilder sb = new StringBuilder();
+            sb.AppendLine("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
+            sb.AppendLine("<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">");
+
+            DateTime? latestTime = null;
+            
+            // Articles
+            foreach (var p in blogPostRepo.GetHeaders().Where(x => "PUBLIC".Equals(x.Access)).OrderBy(x => x.Id))
+            {
+                sb.AppendLine("  <url>");
+                sb.AppendLine($"   <loc>{urlPrefix}/viewer/{p.Id}</loc>");
+                var dt = blogPostRepo.GetFileModDate(p);
+                if (dt != null)
+                {
+                    if (MINSEODATE.CompareTo(dt) > 0) dt = MINSEODATE;
+                    sb.AppendLine($"   <lastmod>{((DateTime)dt).ToString("o")}</lastmod>");
+                    if (latestTime == null) latestTime = dt;
+                    else if (dt.Value.CompareTo(latestTime) > 0) latestTime = dt;
+                }
+
+                sb.AppendLine("   <changefreq>weekly</changefreq>");
+                sb.AppendLine("  </url>");
+            }
+
+            // Index page
+            sb.AppendLine("  <url>");
+            sb.AppendLine($"   <loc>{urlPrefix}/</loc>");
+            sb.AppendLine("   <changefreq>weekly</changefreq>");
+            sb.AppendLine("   <priority>0.1</priority>");
+            if (latestTime != null)
+            {
+                sb.AppendLine($"   <lastmod>{((DateTime)latestTime).ToString("o")}</lastmod>");
+            }
+            sb.AppendLine("  </url>");
+
+
+            // Done
+            sb.AppendLine("</urlset>");
+            return sb.ToString();
+        }
+
+
+        private bool isUpdatingSitemap = false;
+        private void UpdateSiteMap()
+        {
+            lock (siteMapLock)
+            {
+                // Check if this thread is already rebuilding the sidemap and skip.
+                // (Most importang skips dual-notifiy of crawlers)
+                // C#-lock can be reentered by the thread keeping the lock.
+                // This may occurr here, when the BlogPostRepo calls changed, which
+                // is triggered by accessing the BlogPostRepo during the
+                // Sitemap-creation.
+                if (!isUpdatingSitemap)
+                {
+                    isUpdatingSitemap = true;
+                    try
+                    {
+                        var oldSm = siteMapCache;
+                        if (String.IsNullOrEmpty(oldSm))
+                        {
+                            oldSm = LoadSitemapCache();
+                        }
+
+                        logger.LogInformation("Rebuilding Sitemap");
+                        var sm = CreateSitemap();
+                        siteMapCache = sm;
+                        SaveSitemapCache(sm);
+
+                        if (!String.Equals(sm, oldSm))
+                        {
+                            logger.LogInformation("Sitemap changed");
+                            Task.Run(async () =>
+                            {
+                                await PingCrawlersAsync();
+                            });
+                        }
+                        else
+                        {
+                            logger.LogInformation("Sitemap not changed");
+                        }
+                    }
+                    finally
+                    {
+                        isUpdatingSitemap = false;
+                    }
+                }
+                else
+                {
+                    logger.LogInformation("Already rebuilding Sitemap. Skip");
+                }
+            }
+        }
+
+
+      
+
+        private async Task<bool> PingCrawlersAsync()
+        {
+            if (blogEnv.BlogConfig.AllowSearchBots || blogEnv.BlogConfig.AllowSearchDevBot)
+            {
+                // Notify google
+                var n1 = Task.Run(async () =>
+                {
+                    using (var httpClient = new HttpClient())
+                    {
+                        /*WebUtility.UrlEncode*/
+                        var u = Uri.EscapeUriString($"http://www.google.com/ping?sitemap={(urlPrefix + "/sitemap.xml")}");
+                        logger.LogInformation($"Notifying crawlers: Google ({u})");
+                        using (var response = httpClient.GetAsync(u))
+                        {
+                            string code = response.Result.StatusCode.ToString();
+                            string apiResponse = await response.Result.Content.ReadAsStringAsync();
+                            logger.LogInformation($"Google responded: {code} / {apiResponse}");
+                        }
+                    }
+                });
+
+                // Notify bing
+                var n2 = Task.Run(async () =>
+                {
+                    using (var httpClient = new HttpClient())
+                    {
+                        /*WebUtility.UrlEncode*/
+                        var u = Uri.EscapeUriString($"http://www.bing.com/ping?sitemap={(urlPrefix + "/sitemap.xml")}");
+                        logger.LogInformation($"Notifying crawlers: Bing ({u})");
+                        using (var response = httpClient.GetAsync(u))
+                        {
+                            string code = response.Result.StatusCode.ToString();
+                            string apiResponse = await response.Result.Content.ReadAsStringAsync();
+                            logger.LogInformation($"Bing responded: {code} / {apiResponse}");
+                        }
+                    }
+                });
+
+                await Task.WhenAll(n1, n2);
+                return true;
+            }
+            return false;
+        }
+
+
+        private string LoadSitemapCache()
+        {
+            try
+            {
+                if (System.IO.File.Exists(sitemapCacheFile))
+                {
+                    return System.IO.File.ReadAllText(sitemapCacheFile);
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, $"Error reading sitemapCacheFile ${sitemapCacheFile}");
+            }
+
+            return null;
+        }
+
+
+
+        private bool SaveSitemapCache(string sitemap)
+        {
+            try
+            {                
+                System.IO.File.WriteAllText(sitemapCacheFile, sitemap);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, $"Error writing sitemapCacheFile file ${sitemapCacheFile}");
+            }
+
+            return false;
+        }
+
+
+
+        private void BlogPostRepo_BlogPostsChanged(object sender, EventArgs e)
+        {            
+            UpdateSiteMap();            
+        }
+              
+    }
+}

Blog3000/Server/MiddleWares/SearchBotHandler.cs

@@ -0,0 +1,230 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Primitives;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Ganss.XSS;
+using System.IO;
+using Markdig;
+using Markdig.Syntax;
+using Blog3000.Shared;
+using Microsoft.Extensions.Logging;
+
+namespace Blog3000.Server.MiddleWares
+{
+    public class SearchBotHandler
+    {
+        /// <summary>
+        /// Default no SEO is allowed. 
+        /// Two-Folded strategy: Prohibit via static robots.txt and http headers
+        /// On valid bots indexing may be allowed. The synthetics index + blosts are created, which
+        /// match the uri-scheme of the blazor-viewer on the client
+        /// </summary>        
+        /// <param name="allowIndexing">allow valid bots like bing+google</param>
+        /// <param name="allowDevBot">allow a dev-test-box 'xx-testbot-xx'</param>
+        /// <returns></returns>
+
+        private readonly string blogName;
+        private readonly bool allowIndexing;
+        private readonly bool allowDevBot;
+
+        private readonly ILogger logger;
+        private readonly SEOMgr seoMgr;
+
+        public SearchBotHandler(ILogger<SearchBotHandler> logger, BlogEnv blogEnv, SEOMgr seoMgr)
+        {
+            this.logger = logger;
+            this.seoMgr = seoMgr;
+            this.blogName = blogEnv?.BlogConfig?.Title ?? "Blog3000 Instance";
+            this.allowIndexing = blogEnv.BlogConfig.AllowSearchBots;
+            this.allowDevBot = blogEnv.BlogConfig.AllowSearchDevBot;
+        }
+
+
+        public async Task<bool> Process(HttpContext context)
+        {            
+            string robotsTag = "noindex, nofollow";
+            StringValues uas;
+            bool isAllowedRobot = false;
+            bool allowForAll = false;
+            bool res = false; // Allow passing the pipeline
+
+            // Check if it an allowed robot first
+            if (context.Request.Headers.TryGetValue("User-Agent", out uas))
+            {
+                //logger.LogInformation($"User-Agent|{uas}");
+
+                foreach (var ua in uas)
+                {
+                    var lua = ua?.ToLowerInvariant() ?? "";
+                    if ((allowIndexing) && (lua.Contains("googlebot"))
+                    || ((allowIndexing) && (lua.Contains("bingbot")))
+                    || ((allowDevBot) && (lua.Contains("xx-testbot-xx")))
+                    )
+                    {
+                        logger.LogInformation($"Robot detected|{context.Connection.RemoteIpAddress}|{lua}");
+                        robotsTag = "noarchive, noimageindex, max-image-preview:none, max-snippet:50";
+                        isAllowedRobot = true;
+                    }
+                }
+            }
+
+            //if (context.Request.Path.ToString().Equals("/sitemap.xml"))
+            //{
+            //    logger.LogInformation($"Sitemap request|{context.Connection.RemoteIpAddress}|Allowing for all useragents, now: {uas}");
+            //    allowForAll = true;
+            //}
+
+            if (!isAllowedRobot && !allowForAll)
+            {
+
+                //if ((allowIndexing || allowDevBot) && (context.Request.Path.ToString().Equals("/")))
+                //{
+                //    logger.LogInformation($"Allow index for / for all UA |{context.Connection.RemoteIpAddress}|Useragent {uas}");
+                //    res = false;
+                //}
+                //else if ((allowIndexing || allowDevBot) && (context.Request.Path.ToString().Equals("/robots.txt")))
+                //{
+                //    logger.LogInformation($"Suppressing negative robots for all UA|{context.Connection.RemoteIpAddress}|Useragent {uas}");
+                //    context.Response.StatusCode = 404;
+                //    res = true;
+                //}
+                //else
+                {
+                    context.Response.Headers.Add("X-Robots-Tag", robotsTag);
+                    res = false;
+                }                
+            }
+            else
+            {
+                if (context.Request.Path.ToString().StartsWith("/robots.txt"))
+                {
+                    logger.LogInformation($"Robot robots.txt output|{context.Connection.RemoteIpAddress}");
+                    StringBuilder sb = new StringBuilder();
+                    sb.AppendLine("User-Agent: *"); // Can be wildcard, since we create this only for allowed robots anyway
+                    sb.AppendLine("Allow: *");
+
+                    // TODO: Use from Program.visibleUrlPrefix?
+                    sb.AppendLine($"Sitemap: {(context.Request.IsHttps ? "https" : "http")}://{context.Request.Host}/sitemap.xml");
+
+                    context.Response.ContentType = "text/xml";
+                    context.Response.Headers.Add("Encoding", "UTF-8");
+                    context.Response.StatusCode = 200;
+
+                    await context.Response.WriteAsync(sb.ToString());
+                    //context.Response.StatusCode = 404;
+                    res = true;
+                }
+                else if (context.Request.Path.ToString().Equals("/"))
+                {
+                    // TODO: Move to SEOMgr
+                    
+                    logger.LogInformation($"Robot index output|{context.Connection.RemoteIpAddress}");
+
+                    //// Dont index syntetic start page 
+                    // robotsTag = "noindex";
+
+                    context.Response.ContentType = "text/html";
+                    context.Response.Headers.Add("Encoding", "UTF-8");
+                    context.Response.Headers.Add("X-Robots-Tag", robotsTag);
+                    context.Response.StatusCode = 200;
+
+                    var repo = context.RequestServices.GetService<BlogPostRepo>();
+
+                    // Create list with blogpost-links
+
+                    
+                    StringBuilder csb = new StringBuilder();
+
+                    //
+                    // Stick items first, may contain important legal stuff
+                    // Which should no be seen by enduser but who knows
+                    //
+                    foreach (var p in repo.GetHeaders().Where(x => "PUBLIC".Equals(x.Access))
+                        .Where(x => x.StickyMenuPos >= 0)
+                        .OrderBy(c => c.StickyMenuPos)
+                        .ThenBy(c => c.Title))
+                    {
+                        csb.AppendLine($"<li><a href='viewer/{p.Id}'>{InputSanitizer.Default.SanitizeText(p.Title, true)}</a>");
+                    }
+
+                    //
+                    // Now the articles them selfes
+                    //
+                    foreach (var p in repo.GetHeaders().Where(x => "PUBLIC".Equals(x.Access)).OrderBy(c => c.Title))
+                    {
+                        csb.AppendLine($"<li><a href='viewer/{p.Id}'>{InputSanitizer.Default.SanitizeText(p.Title, true)}</a>");
+                    }
+
+                    var htmlSanitizer = new HtmlSanitizer();
+
+                    StringBuilder sb = new StringBuilder();
+                    sb.AppendLine("");
+                    sb.AppendLine("");
+                    sb.AppendLine("<html>");
+                    sb.AppendLine("<head>");
+                    sb.AppendLine($"<title>{blogName} - Mainpage</title>");
+                    sb.AppendLine($"<meta name='description' content='Index page of blog'></meta>");
+                    sb.AppendLine($"<meta name='keywords' content='MainPage,Index,Content'></meta>");
+                    sb.AppendLine("</head>");
+                    sb.AppendLine("<body><h1>Welcome to my blog</h1><hr>Site contents / current articles:<ul>");
+                    sb.AppendLine(htmlSanitizer.Sanitize(csb.ToString()));
+                    sb.AppendLine("</ul></body>");
+                    sb.AppendLine("</html>");
+
+                    // Create final output                    
+                    await context.Response.WriteAsync(sb.ToString());
+                    res = true;
+                }
+                else if (context.Request.Path.ToString().Equals("/sitemap.xml"))
+                {
+                    // Dont index syntetic start page
+                    logger.LogInformation($"Robot sitemap.xml|{context.Connection.RemoteIpAddress}");
+                    robotsTag = "";
+
+                    context.Response.ContentType = "text/xml";
+                    context.Response.Headers.Add("Encoding", "UTF-8");
+                    //context.Response.Headers.Add("X-Robots-Tag", robotsTag);
+                    context.Response.StatusCode = 200;
+
+                    var sm = seoMgr.GetSiteMap();
+
+
+                    await context.Response.WriteAsync(sm);
+                    res = true;
+                }
+                else if (context.Request.Path.ToString().StartsWith("/viewer/"))
+                {                    
+                    var repo = context.RequestServices.GetService<BlogPostRepo>();
+                    var id = context.Request.Path.ToString().Split("/").Last();
+
+                    logger.LogInformation($"Robot post output|{context.Connection.RemoteIpAddress}|{id}");
+
+                    var bp = repo.GetHeaders().Where(x => "PUBLIC".Equals(x.Access) && String.Equals(id, x.Id)).FirstOrDefault();
+                    if (bp == null)
+                    {
+                        // Not found or no access
+                        context.Response.StatusCode = 404;
+                    }
+                    else
+                    {
+                        context.Response.Headers.Add("X-Robots-Tag", robotsTag);
+                        context.Response.StatusCode = 200;
+                        context.Response.ContentType = "text/html";
+                        context.Response.Headers.Add("Encoding", "UTF-8");
+                        
+                        StringBuilder sb = seoMgr.BuildBlogPostOutput(bp);
+                        await context.Response.WriteAsync(sb.ToString());
+                    }
+                    res = true;
+                }
+            }
+
+            return res;
+        }
+
+    }
+}

Blog3000/Server/MiddleWares/UpdateTweeter.cs

@@ -0,0 +1,445 @@
+using AngleSharp.Css.Dom;
+using Blog3000.Server.Utils;
+using Blog3000.Shared;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Data.Common;
+using System.Linq;
+using System.Runtime.InteropServices.ComTypes;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using Tweetinvi;
+using Tweetinvi.Core.Models;
+using Tweetinvi.Exceptions;
+using Tweetinvi.Models;
+
+namespace Blog3000.Server
+{
+
+
+    internal class UpdateTweeter : IHostedService, IDisposable
+    {
+
+        private readonly ILogger logger;
+        private readonly BlogPostRepo repo;
+        
+        private readonly string tweetStatusFn;        
+        private readonly SemaphoreSlim sema = new SemaphoreSlim(1);
+
+        private readonly string uriPrefix;
+        private readonly bool enabled;
+        private readonly bool testMode;
+        private readonly string apiKey;
+        private readonly string apiSecret;
+        private readonly string accessToken;
+        private readonly string accessTokenSecret;
+
+        private bool needsRescan = true;
+        private Timer timer;
+        private Dictionary<string, TweetStatus> tweetStati;
+
+        public UpdateTweeter(ILogger<UpdateTweeter> logger, BlogPostRepo repo, BlogEnv blogEnv)
+        {
+            this.logger = logger;
+            this.repo = repo;
+
+            this.enabled = blogEnv.BlogConfig.TwitterEnabled;
+            this.uriPrefix = blogEnv.BlogConfig.VisibleUrlPrefix;
+            this.testMode = blogEnv.BlogConfig.TwitterTestMode;
+            this.apiKey = DataProtect.Static.Unprotect(blogEnv.BlogConfig.Protected.TwitterAPIKey);
+            this.apiSecret = DataProtect.Static.Unprotect(blogEnv.BlogConfig.Protected.TwitterAPISecret);
+            this.accessToken = DataProtect.Static.Unprotect(blogEnv.BlogConfig.Protected.TwitterAccessToken);
+            this.accessTokenSecret= DataProtect.Static.Unprotect(blogEnv.BlogConfig.Protected.TwitterAccessSecret);
+
+            tweetStatusFn = System.IO.Path.Combine(
+              (string)AppDomain.CurrentDomain.GetData("AppDataPath"),
+              "tweetstatus.json");
+        }
+
+
+
+        public void Dispose()
+        {
+            timer?.Dispose();
+            repo.BlogPostsChanged -= Repo_BlogPostsChanged;
+        }
+
+
+        public Task StartAsync(CancellationToken cancellationToken)
+        {
+            if (enabled) {
+                logger.LogInformation("Service starting...");
+
+
+                timer = new Timer(RunSenderAsync, null, TimeSpan.Zero, TimeSpan.FromSeconds(1 * 60 * (testMode ? 2 : 1)));
+                repo.BlogPostsChanged += Repo_BlogPostsChanged;
+            }
+            else
+            {
+                logger.LogInformation("Twitter not enabled...");
+            }
+
+            return Task.CompletedTask;
+        }
+
+
+        public Task StopAsync(CancellationToken cancellationToken)
+        {
+            logger.LogInformation("Service stopping.");
+
+            timer?.Dispose();
+            timer = null;
+
+            repo.BlogPostsChanged -= Repo_BlogPostsChanged;
+
+            return Task.CompletedTask;
+        }
+
+
+        private void Repo_BlogPostsChanged(object sender, EventArgs e)
+        {
+            try
+            {
+                DoRescan();
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning($"Error while rescanning blogpots from event: {ex}");
+            }
+        }
+
+
+        private async void RunSenderAsync(object state)
+        {
+            if (needsRescan)
+            {
+                try
+                {
+                    DoRescan();
+                }
+                catch (Exception ex)
+                {
+                    logger.LogWarning($"Error while rescanning blogpots from sender-task: {ex}");
+                }
+                needsRescan = false;
+            }
+
+            if (sema.Wait(2000))
+            {
+                try
+                {
+                    foreach (var e in tweetStati.Values.OrderBy(c => c.ErrCount).ThenBy(c => c.PostId))
+                    {
+                        if (e.NeedsUpdate || e.NeedsDeletion)
+                        {
+                            logger.LogInformation($"Tweeting for {e.PostId} on update, new={e.InitialTweetId == null}");
+                            try
+                            {
+                                if (e.NeedsDeletion)
+                                {
+                                    logger.LogInformation($"Deleting tweets for removed posts {e.PostId}");
+
+                                    if (e.InitialTweetId != null)
+                                    {
+                                        await DeleteAsync((long)e.InitialTweetId);
+                                    }
+
+                                    if (e.UpdateTweetId != null)
+                                    {
+                                        await DeleteAsync((long)e.UpdateTweetId);
+                                    }
+
+                                    e.InitialTweetId = null;
+                                    e.UpdateTweetId = null;
+                                    e.NeedsDeletion = false;
+                                    tweetStati.Remove(e.PostId);
+                                }
+                                else if (e.NeedsUpdate)
+                                {
+                                    var bp = repo.GetHeaders().Where(p => Object.Equals(p.Id, e.PostId)).FirstOrDefault();
+                                    if (bp == null)
+                                    {
+                                        logger.LogInformation($"{e.PostId} not found in repo!");
+                                        e.NeedsUpdate = false;
+                                    }
+                                    else
+                                    {
+                                        if (e.InitialTweetId == null)
+                                        {
+                                            string txt = BuildTweet(bp, true);
+                                            logger.LogInformation($"Tweeting about new post {e.PostId}: {txt}");
+
+                                            // Initial post
+                                            var tweet = await PostAsync(txt);
+                                            e.InitialTweetId = tweet.Id;
+                                        }
+                                        else
+                                        {
+                                            if (e.UpdateTweetId != null)
+                                            {
+                                                logger.LogInformation($"Deleting old tweet for for {e.PostId}");
+                                                await DeleteAsync((long)e.UpdateTweetId);
+                                            }
+
+                                            string txt = BuildTweet(bp, false);
+                                            logger.LogInformation($"Tweeting about updated post {e.PostId}: {txt}");
+
+                                            // Update post
+                                            var tweet = await PostAsync(txt);
+                                            e.UpdateTweetId = tweet.Id;
+                                        }
+                                        e.LastPostChecksum = bp.Checksum;
+                                        e.TweetTime = DateTime.UtcNow;
+                                        e.NeedsUpdate = false;
+                                    }
+                                    // e.TweetTime = DateTime.UTCNow;
+                                }
+                                e.ErrCount = 0;
+                                e.LastErr = null;
+                            }
+                            catch(Exception twx)
+                            {
+                                e.LastErr = twx.ToString();
+                                e.ErrCount++;
+                            }
+                            Save(tweetStati);
+                            break;
+                        }
+                    }
+                }
+                finally
+                {
+                    sema.Release();
+                }
+            }
+        }
+
+
+        private void DoRescan()
+        {
+            needsRescan = true;
+            try
+            {
+                if (sema.Wait(1000))
+                {
+                    try
+                    {
+                        logger.LogInformation("Rescanning for changed posts");
+                        bool hasChanges = false;
+
+                        tweetStati ??= Load();
+
+                        var existingPostId = new Dictionary<string, bool>();
+                        foreach (var p in repo.GetHeaders())
+                        {
+                            if (p.NoSocialMediaInfo)
+                            {
+                                continue;
+                            }
+
+                            existingPostId[p.Id] = true;
+                            TweetStatus ts;
+                            if (!tweetStati.TryGetValue(p.Id, out ts))
+                            {
+                                ts = new TweetStatus();
+                                ts.PostId = p.Id;
+                                ts.NeedsUpdate = true;
+                                tweetStati[p.Id] = ts;
+                                hasChanges = true;
+                            }
+                            else
+                            {
+                                if (ts.LastPostChecksum == null || (String.Compare(ts.LastPostChecksum, p.Checksum) != 0))
+                                {
+                                    bool lastUpdateLongEnoughAgo = ts.TweetTime.HasValue && ts.TweetTime.Value.AddHours(18).CompareTo(DateTime.UtcNow) < 0;
+                                    bool newRevisionSinceLastUpdate = (p.Revisions?.Latest()?.ChangedAt?.CompareTo(ts.TweetTime.GetValueOrDefault(DateTime.MinValue)) ?? 0) > 0;
+
+                                    if (/* Not yet tweeted yet */
+                                        (ts.InitialTweetId == null) ||
+
+                                        /* Update required because new revision, and long enough since last tweet */
+                                        (ts.InitialTweetId != null && lastUpdateLongEnoughAgo && newRevisionSinceLastUpdate)
+                                        )
+                                    {
+                                        ts.NeedsUpdate = true;
+                                        hasChanges = true;
+                                    }
+                                }
+                            }
+                        }
+
+                        foreach (var ts in tweetStati.Values)
+                        {
+                            if (ts.PostId != null)
+                            {
+                                if (!existingPostId.ContainsKey(ts.PostId))
+                                {
+                                    ts.NeedsDeletion = true;
+                                    hasChanges = true;
+                                }
+                            }                           
+                        }
+
+                        if (Program.xCleanTweets)
+                        {
+                            foreach (var ts in tweetStati.Values)
+                            {
+                                ts.NeedsDeletion = true;
+                                hasChanges = true;
+                            }
+                        }
+
+                        if (hasChanges)
+                        {
+                            logger.LogInformation("Posts detected for tweet-updates...");
+                            Save(tweetStati);
+                        }
+                    }
+                    finally
+                    {
+                        sema.Release();
+                    }
+                }
+            }
+            finally
+            {
+                needsRescan = false;
+            }
+        }
+
+
+        #region TweetTextBuilder
+
+
+        private string BuildTweet(BlogPostHeader bh, bool isNew)
+        {
+            const int maxLen = 280;
+
+            string hdr = (testMode ? "[TEST!]": "") + (isNew ? "New post: " : "Post updated: ");
+            string url = $"{uriPrefix}/viewer/{bh.Id}";
+            string tags = "";
+            string tit = bh.Title;
+
+
+            if (bh.Topics != null)
+            {
+                foreach (var t in bh.Topics)
+                {
+                    tags += t + " ";
+                    if (tags.Length > 80) break;
+                }
+            }
+                                  
+            int clen = tit.Length + hdr.Length + url.Length + tags.Length + 2 + 2; // spaces + ""
+            int remain = maxLen - clen;
+            if (remain < 0)
+            {
+                tit = tit.Substring(0, tit.Length - remain - "...".Length)+"...";
+            }
+            return $"{hdr}'{tit}' {tags}{url}";
+        }
+
+        #endregion
+
+
+        #region StatusData + Persistence 
+
+        protected class TweetStatus
+        {
+            public string PostId { get; set; }
+            public string LastPostChecksum { get; set; }
+            public DateTime? TweetTime { get; set; }
+            public long? InitialTweetId { get; set; }
+            public long? UpdateTweetId { get; set; }
+            public bool NeedsDeletion { get; set; } = false;
+            public bool NeedsUpdate { get; set; } = false;
+            public string LastErr { get; set; }
+            public int ErrCount { get; set; } = 0;
+        }
+
+        private Dictionary<string, TweetStatus> Load()
+        {
+            Dictionary<string, TweetStatus> res = null;
+
+            try
+            {
+                if (System.IO.File.Exists(tweetStatusFn))
+                {
+                    var text = System.IO.File.ReadAllText(tweetStatusFn);
+                    res = JsonSerializer.Deserialize<Dictionary<string, TweetStatus>>(text);
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, $"Error reading tweetstatus file ${tweetStatusFn}");
+            }
+
+            return res ?? new Dictionary<string, TweetStatus>();
+
+        }
+
+
+        private bool Save(Dictionary<string, TweetStatus> tweetStati)
+        {
+            tweetStati ??= new Dictionary<string, TweetStatus>();
+
+            try
+            {
+                var text = JsonSerializer.Serialize(tweetStati);
+                System.IO.File.WriteAllText(tweetStatusFn, text);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, $"Error writing tweetstatus file ${tweetStatusFn}");
+            }
+
+            return false;
+        }
+
+        #endregion
+
+
+        #region Auth-Config
+
+
+        public async Task<ITweet> PostAsync(string txt)
+        {
+            // Get a AuthenticatedUser from a specific set of credentials
+            var creds = new TwitterCredentials(apiKey, apiSecret, accessToken, accessTokenSecret);
+            var cln = new TwitterClient(creds);
+            return await cln.Tweets.PublishTweetAsync(txt);
+        }
+
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="tweetId"></param>
+        /// <returns></returns>
+        public async Task<bool> DeleteAsync(long tweetId)
+        {
+            // Get a AuthenticatedUser from a specific set of credentials
+            try
+            {
+                var creds = new TwitterCredentials(apiKey, apiSecret, accessToken, accessTokenSecret);
+                var cln = new TwitterClient(creds);
+                await cln.Tweets.DestroyTweetAsync(tweetId);
+                return true;
+            }
+            catch(Exception ex)
+            {
+                logger.LogWarning(ex, $"Error deleteing ${tweetId}");
+                return false;
+            }
+        }
+
+
+        #endregion
+    }
+}

Blog3000/Server/Program.cs

@@ -0,0 +1,239 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using AspNetCoreRateLimit;
+using Blog3000.Client;
+using Blog3000.Server.Utils;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Syslog.Framework.Logging;
+
+namespace Blog3000.Server
+{
+    public class Program
+    {
+
+        public static string blogDataPath = null;
+
+  
+        public static bool xCleanTweets = false;
+
+        private static string syslogAppName;
+
+        public static async Task Main(string[] args)
+        {
+            Console.WriteLine($"Blog3000 0.1 Build {Blog3000.Server.BuildVersion.BUILD_DATE}");
+
+            //if (args.Length == 0)
+            //{
+            //    ShowHelp();
+            //    Environment.Exit(1);
+            //}
+
+            foreach (var a in args)
+            {
+                Console.WriteLine($"Processing parameter {a}");
+
+                if (a.StartsWith("--help") || a.StartsWith("-h") || a.StartsWith("-?") || a.StartsWith("(/h") || a.StartsWith("/?"))
+                {
+                    ShowHelp();
+                    Environment.Exit(0);
+                }
+                /*if (a.StartsWith("--port="))
+                {
+                    revProxyMode = a.Substring("--port=".Length);
+                }
+                else if (a.StartsWith("--visible-url-prefix="))
+                {
+                    visibleUrlPrefix= a.Substring("--visible-url-prefix=".Length);
+                }
+
+                else*/ if (a.StartsWith("--blog-data-path="))
+                {
+                    blogDataPath = a.Substring("--blog-data-path=".Length);
+                }
+                /*else if (a.StartsWith("--public-dl-uri="))
+                {
+                    publicDlUri = a.Substring("--public-dl-uri=".Length);
+                }
+                else if (a.StartsWith("--allow-search-bots"))
+                {
+                    allowSearchBots = true;
+                }
+                else if (a.StartsWith("--allow-search-devbot"))
+                {
+                    allowSearchDevBot = true;
+                }
+                else if (a.StartsWith("--x-clean-tweets"))
+                {
+                    xCleanTweets = true;
+                }*/
+            }
+
+            Console.WriteLine($"Active parameters");
+            /*Console.WriteLine($"- Blog data path:       {blogDataPath}");
+            Console.WriteLine($"- PublicDlUri:          {publicDlUri}");
+            Console.WriteLine($"- Vislble url-prefix:   {visibleUrlPrefix}");
+            Console.WriteLine($"- Using port:           {revProxyMode}");
+            Console.WriteLine($"- Allow search bots:    {allowSearchBots}");
+            Console.WriteLine($"- Allow  search-devbot: {allowSearchDevBot} ('xx-testbot-xx')");
+            Console.WriteLine("");
+            Console.WriteLine($"- Clean tweets/disable: {xCleanTweets} ");*/
+
+
+            foreach (var a in args)
+            {
+                if (a.StartsWith("--set-protected="))
+                {
+                    SetConfig(a.Substring("--set-protected=".Length), true);
+                }
+            }
+
+ 
+            //if (String.IsNullOrWhiteSpace(visibleUrlPrefix))
+            //{
+            //    Console.Error.WriteLine("Paramter --visible-url-prefix missing. Abort");
+            //    Environment.Exit(1);
+            //}
+
+            var env = BlogEnv.LoadConfig();
+            if (String.IsNullOrWhiteSpace(env.VisibleUrlPrefix))
+            {
+                Console.Error.WriteLine("Parameter VisibleUrlPrefix missing in blogconfig.json. Abort");
+                Environment.Exit(1);
+            }
+
+
+            syslogAppName = env.SyslogAppName;
+
+            //Console.WriteLine(env.ToString());
+            Console.WriteLine($"- Blog data path:       {blogDataPath ?? "<AppDataPath>"}");
+            Console.WriteLine($"- PublicDlUri:          {env.PublicDlUri}");
+            Console.WriteLine($"- Vislble url-prefix:   {env.VisibleUrlPrefix}");
+            Console.WriteLine($"- Using port:           {env.ListenPort ?? 5001}{(env.ListenPort != null ? "NonSSL" : "SSL")}");
+            Console.WriteLine($"- Allow search bots:    {env.AllowSearchBots}");
+            Console.WriteLine($"- Allow search-devbot:  {env.AllowSearchDevBot} ('xx-testbot-xx')");           
+            Console.WriteLine($"- Log to syslog:        {env.SyslogAppName ?? "<disabled>"}");
+
+
+            Console.WriteLine("Starting ASP.Net webhost...");
+
+            var webHost = CreateHostBuilder(args).Build();
+
+            // For IP RateLimiting
+            using (var scope = webHost.Services.CreateScope())
+            {
+                // get the IpPolicyStore instance
+                var ipPolicyStore = scope.ServiceProvider.GetRequiredService<IIpPolicyStore>();
+
+                // seed IP data from appsettings
+                await ipPolicyStore.SeedAsync();
+            }
+
+            webHost.Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                 .ConfigureLogging((hostingContext, logging) =>
+                 {
+                     logging.ClearProviders();
+                     if (syslogAppName == null || System.Diagnostics.Debugger.IsAttached)
+                     {
+                         logging.AddConsole(options => options.IncludeScopes = false);
+                     }
+
+                     //logging.AddDebug();
+                     if (syslogAppName != null)
+                     {
+                         var settings = new SyslogLoggerSettings();
+                         settings.FacilityType = FacilityType.Local0;
+                         settings.HeaderType = SyslogHeaderType.Rfc5424v1;                         
+                         settings.MessageTransportProtocol = Syslog.Framework.Logging.TransportProtocols.TransportProtocol.UnixSocket;
+                         //logging.AddSyslog(new ILoggingBuilder( settings);
+                         logging.AddProvider(new MySyslogLoggerProvider(settings, syslogAppName, System.Environment.MachineName, LogLevel.Debug));
+                     }
+                 })
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    var cfg = BlogEnv.LoadConfig();
+
+                    webBuilder
+                    //.UseUrls(revProxyMode != null ? $"http://127.0.0.1:{revProxyMode}" : "https://0.0.0.0:5001")
+                    .UseUrls(cfg?.ListenPort != null ? $"http://127.0.0.1:{cfg.ListenPort}" : "https://0.0.0.0:5001")
+                    .UseStartup<Startup>();
+                });
+
+
+
+        private static void SetConfig(string parm, bool prot)
+        {
+            Console.WriteLine("Set Config");
+            var bg = BlogEnv.LoadConfig();
+            bg.Protected ??= new BlogEnv.ProtectedConfig(); 
+            if (prot)
+            {
+                if ("twitter-api-key".Equals(parm))
+                {
+                    Console.Write("Twitter API-Key> ");
+                    var s = Console.ReadLine();
+                    bg.Protected.TwitterAPIKey = Utils.DataProtect.Static.Protect(s);
+                }
+                else if ("twitter-api-secret".Equals(parm))
+                {
+                    Console.Write("Twitter API-Secret> ");
+                    var s = Console.ReadLine();
+                    bg.Protected.TwitterAPISecret = Utils.DataProtect.Static.Protect(s);
+                }
+                else if ("twitter-access-token".Equals(parm))
+                {
+                    Console.Write("Twitter Access-Token> ");
+                    var s = Console.ReadLine();
+                    bg.Protected.TwitterAccessToken = Utils.DataProtect.Static.Protect(s);
+                }
+                else if ("twitter-access-secret".Equals(parm))
+                {
+                    Console.Write("Twitter Access-Secret> ");
+                    var s = Console.ReadLine();
+                    bg.Protected.TwitterAccessSecret = Utils.DataProtect.Static.Protect(s);
+                }
+                else
+                {
+                    Console.WriteLine("Bad params");
+                    Environment.Exit(1);
+                }
+                BlogEnv.SaveConfig(bg);
+                Environment.Exit(0);
+            }
+
+            Console.WriteLine("Bad params");
+            Environment.Exit(1);
+        }
+
+
+        private static void ShowHelp()
+        {
+            Console.WriteLine($"Available Parameters: ");
+            Console.WriteLine($"  --blog-data-path= [default app-data-path]");
+            //Console.WriteLine($"  --visible-url-prefix=https://mydemoblog.com (prefix for blogpost-links e.g in sitemap");
+            //Console.WriteLine($"  --port= [default 5001]");
+       
+            //Console.WriteLine($"  --public-dl-uri= [default null]");
+            //Console.WriteLine($"  --allow-search-bots [default false]");
+            //Console.WriteLine($"  --allow-search-devbot [default false]");
+            //Console.WriteLine();
+            //Console.WriteLine($"  --x-clean-tweets [default false], ");
+            //Console.WriteLine("     tweets reappear on false if was true (user-annoyance)!");
+            Console.WriteLine("");
+            Console.WriteLine("Special interactive ops: ");
+            Console.WriteLine("  --set-protected=");
+            Console.WriteLine("      twitter-api-key,twitter-api-secret,");
+            Console.WriteLine("      twitter-access-token,twitter-access-key");
+
+        }
+    }
+}

Blog3000/Server/Properties/PublishProfiles/FolderProfile.pubxml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Diese Datei wird vom Veröffentlichungs-/Paketierungsprozess Ihres Webprojekts verwendet. Sie können das Verhalten dieses Prozesses anpassen,
+indem Sie diese MSBuild-Datei bearbeiten. Weitere Informationen hierzu finden Sie unter https://go.microsoft.com/fwlink/?LinkID=208121. 
+-->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <WebPublishMethod>FileSystem</WebPublishMethod>
+    <PublishProvider>FileSystem</PublishProvider>
+    <LastUsedBuildConfiguration>Release</LastUsedBuildConfiguration>
+    <LastUsedPlatform>Any CPU</LastUsedPlatform>
+    <SiteUrlToLaunchAfterPublish />
+    <LaunchSiteAfterPublish>True</LaunchSiteAfterPublish>
+    <ExcludeApp_Data>False</ExcludeApp_Data>
+    <ProjectGuid>552ab8ae-71cf-4167-8313-7c2a7193725c</ProjectGuid>
+    <publishUrl>bin\Release\netcoreapp3.1\publish\</publishUrl>
+    <DeleteExistingFiles>False</DeleteExistingFiles>
+  </PropertyGroup>
+</Project>

Blog3000/Server/Properties/PublishProfiles/FolderProfile1.pubxml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Diese Datei wird vom Veröffentlichungs-/Paketierungsprozess Ihres Webprojekts verwendet. Sie können das Verhalten dieses Prozesses anpassen,
+indem Sie diese MSBuild-Datei bearbeiten. Weitere Informationen hierzu finden Sie unter https://go.microsoft.com/fwlink/?LinkID=208121. 
+-->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <WebPublishMethod>FileSystem</WebPublishMethod>
+    <PublishProvider>FileSystem</PublishProvider>
+    <LastUsedBuildConfiguration>Release</LastUsedBuildConfiguration>
+    <LastUsedPlatform>Any CPU</LastUsedPlatform>
+    <SiteUrlToLaunchAfterPublish />
+    <LaunchSiteAfterPublish>True</LaunchSiteAfterPublish>
+    <ExcludeApp_Data>False</ExcludeApp_Data>
+    <ProjectGuid>552ab8ae-71cf-4167-8313-7c2a7193725c</ProjectGuid>
+    <publishUrl>\\ZEUS\blog_mh3000_net\exe</publishUrl>
+    <DeleteExistingFiles>True</DeleteExistingFiles>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <SelfContained>false</SelfContained>
+  </PropertyGroup>
+</Project>

Blog3000/Server/Properties/launchSettings.json

@@ -0,0 +1,29 @@
+{
+  "XuseWebAssemblyDebugging": true,
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:57461",
+      "sslPort": 44396
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Blog3000.Server": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "XinspectUri": "{wsProtocol}://{url.hostname}:{url.port}/_framework/debug/ws-proxy?browser={browserInspectUri}"
+    }
+  }
+}

Blog3000/Server/README.md

@@ -0,0 +1,133 @@
+# Blog3000
+
+_Alpha Prototype software_
+
+Simple blog software with(out) following features
+
+- Written in .Net core
+- Using blazor on the client (C# instead of javascript!!!!)
+- Using ASP.NEt Core on server
+- Caches all blog-data in the browser for offline use. 
+- Installable PWA
+- Simple view-stats
+- Serverside Search-Robot-Support for bing/google
+- BlogPosts are stored as MarkDown. Images are supported. Can
+  be edited by blogger directly on server. Markdown is enahanced
+  with tags in the first lines "@" providing metadata and id
+
+#### Install / Configure
+
+TODO
+
+#### Markdown header format
+
+TODO
+
+### Parameters
+
+Start Server without parameters to get a parameter list/help 
+
+
+
+### Runing on Linux (Gentoo)
+
+#### Config
+
+Use blogconfig.json from www-root as template and copy to your blog-data-path.
+Modify as neeed. To Set value in protected start server without parameters
+to see commandline-parameters therefore.
+
+
+#### Init-script
+
+```
+#!/sbin/openrc-run
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+depend() {
+        need net
+        use dns logger
+        after apache2
+}
+
+configtest() {
+        ebegin "Checking ${SVCNAME} configuration"
+        eend $?
+}
+
+start() {
+        ebegin "Starting ${SVCNAME}"
+
+        nohup -- su -s /bin/bash blogmh3000 -c "(cd /var/www/blog-mh3000-net/server/exe && /opt/dotnet31/dotnet Blog3000.Server.dll  --blog-data-path=/var/www/blog-mh3000-net/server/data  | logger -t blogmh3000 )" > /dev/null &
+
+        eend ${retval}
+}
+
+stop() {
+        ebegin "Stopping ${SVCNAME}"
+        kill  `ps ax | grep Blog3000 | grep " /opt/dotnet31" | grep -v "bash" | cut -b 1-5` || exit ß
+}
+```
+
+### Syslog-ng
+
+Add this somewhere before the log(message)-lines.
+
+```
+# Blog
+filter f_blogmh3000 { program(blogmh3000); };
+destination dest_blog3000 { file("/var/log/blogmh3000.log"); };
+log { source(src); filter(f_blogmh3000); destination(dest_blog3000); flags(final);};
+```
+
+Rename according to your own names. Note: the `program()` filter equals the `| logger -t [PROGRAM]` in the initscript above.
+
+### Logrotate
+
+Add as /etc/logrotate.d/blogmh3000:
+```
+/var/log/blogmh3000.log {
+  missingok
+  notifempty
+  sharedscripts
+  postrotate
+        /etc/init.d/syslog-ng reload > /dev/null 2>&1 || true
+  endscript
+}
+```
+
+As before, rename according to your own names.
+
+
+## Further notes
+
+#### Downloads
+
+Currently a _very rough_ feature for offering downloads from the blog is available:
+The authors can put files on a cdn/ftp/public website, and reference them via
+the "/PublicDl". The server then is called with the filename and returns the actual
+url to the actual download site. This would allow download-counting or one-time url
+for protected downlodas in the future. 
+
+No sub-folder are supported at the moment.
+
+Downloads may not reside in the same domain, otherwise router-module of the blog-app
+may take over and return 404.
+
+Perhabs in the future a javascript base downloader may resolve this issue and allow
+file living in the blogs url-space for more easness.
+
+#### Testing SEO output
+
+with testbox enabled e.g. use wget
+
+```
+wget -O - --header="User-Agent: xx-testbot-xx" --no-check-certificate https://local-ip:5001/
+```
+
+
+_(C) 2020 Michael Hoess, MIT-License_
+
+
+

Blog3000/Server/Startup.cs

@@ -0,0 +1,151 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.ResponseCompression;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System.Linq;
+using System;
+using Microsoft.Extensions.Primitives;
+using System.Buffers;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.DataProtection.Repositories;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Razor.Language;
+using Blog3000.Server.MiddleWares;
+using Microsoft.Extensions.Logging;
+using Microsoft.AspNetCore.HttpOverrides;
+using AspNetCoreRateLimit;
+using Blog3000.Server.Controllers;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Blog3000.Server
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddOptions(); // Read from appsettings.json, ForRateLimit
+            services.AddControllersWithViews();
+            services.AddMemoryCache(); // For BlogPostRepo, RateLimit
+            services.AddDataProtection(); // ASP.Net-Core variant of DPAPI
+
+            // Next block sole for IP-Rate-Limiter    
+
+            //load rules from appsettings.json
+            services.Configure<IpRateLimitOptions>(Configuration.GetSection("IpRateLimiting"));
+            services.Configure<IpRateLimitPolicies>(Configuration.GetSection("IpRateLimitPolicies"));
+            // inject counter and rules stores
+            services.AddSingleton<IIpPolicyStore, MemoryCacheIpPolicyStore>();
+            services.AddSingleton<IRateLimitCounterStore, MemoryCacheRateLimitCounterStore>();
+            // https://github.com/aspnet/Hosting/issues/793
+            // the IHttpContextAccessor service is not registered by default.
+            // the clientId/clientIp resolvers use it.
+            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
+            // configuration (resolvers, counter key builders)
+            services.AddSingleton<IRateLimitConfiguration, RateLimitConfiguration>();
+
+
+            // Now add own services
+
+            services.AddSingleton(typeof(BlogEnv));
+            services.AddSingleton(typeof(BlogPostRepo));
+            services.AddHostedService<BlogPostRepoUpdater>();
+            services.AddHostedService<UpdateTweeter>();
+            services.AddSingleton<SEOMgr>();
+            services.AddSingleton(typeof(SearchBotHandler));
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+
+            app.UseIpRateLimiting();
+
+
+            app.UseForwardedHeaders(new ForwardedHeadersOptions
+            {
+                //ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
+                ForwardedHeaders = ForwardedHeaders.All
+            });
+
+
+            // Add our custom headers
+            app.Use(async (context, next) =>
+            {
+                // ForwardedHeaders won't set this even for X-Forward-For: https//... ?
+                // (because of proxied to http://localhost ??)                
+                // Therefore force to true now. So it won't break url-generation in sitemap etc..
+                // Perhaps make this configurable like "--publicUrl=...."
+                context.Request.IsHttps = true;
+
+
+                context.Response.Headers.Add("X-Blog3000-Build", Blog3000.Server.BuildVersion.BUILD_DATE);
+                await next.Invoke();
+            });
+
+
+            // No Cache
+            var cp = new NoCacheHeaderAdder(new string[] { "/robots.txt", "/config.json", "/manifest.json", "/favicon.ico" });
+            app.Use(async (context, next) =>
+            {
+                cp.Process(context);
+                await next.Invoke();
+            });
+
+
+            // Handle SearchBot requests
+            app.Use(async (context, next) =>
+            {
+
+                var sbh = context.RequestServices.GetService<SearchBotHandler>();
+                var res = await sbh.Process(context);
+                if (res) return; // Request completly handling by SEO
+
+                await next.Invoke();
+            });
+
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+                app.UseWebAssemblyDebugging();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Error");
+                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+                // app.UseHsts();
+            }
+
+
+            //app.UseHttpsRedirection();
+            app.UseBlazorFrameworkFiles();            
+            app.UseRouting();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllerRoute(
+                        name: "config",
+                        pattern: "/config.json",
+                        defaults: new { controller = "Config", action = "Get" }
+                        );
+                endpoints.MapControllers();
+                endpoints.MapFallbackToFile("index.html");
+            });
+
+            app.UseStaticFiles();
+
+
+        }
+    }
+}

Blog3000/Server/TODO.txt

@@ -0,0 +1,40 @@
+
+X Non-offlien-mode: check if cached article has changed since last download on view, download before view if online
+X Cache problem
+X Search article count includes articles not in list
+
+- Show Articles TOPICS in Viewer
+
+- MarkDown with source codes looks upgly
+- Fixed with fonts? Blocksatz?
+
+
+- add storage to top-topics
+
+- Log - Console Output auch nach SysLog wenn enabled
+
+- Twitter Url unten anzeigen
+
+- Abbruch ohne DataPath und nicht vorhanden, vor config-set
+
+
+
+- "$IMAGES$"
+- User-notify on new articles
+- AppSettings-Feature instad on config.json (config should not be override by deployment!)
+- File-Change-Date in Revision?
+
+- DlCounter/Checker
+
+VNext:
+- Config/ConfigJson reread after 1 min
+- Install improvement / Offline-Mode / Search auch remote
+- Login
+  - Private articles
+  - Edit-articlesöö
+- Comments 
+  - Nur wenn online edit + view
+  - Manuelles freischalten
+ 
+- Houdglass  bei Postfinder?
+

Blog3000/Server/Utils/DataProtect.cs

@@ -0,0 +1,52 @@
+using Microsoft.AspNetCore.DataProtection;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Blog3000.Server.Utils
+{
+    public class DataProtect
+    {
+        private static DataProtect _static;
+
+        public static DataProtect Static
+        {
+            get
+            {
+                if (_static == null)
+                {
+                    var serviceCollection = new ServiceCollection();
+                    serviceCollection.AddDataProtection();
+                    var services = serviceCollection.BuildServiceProvider();
+
+                    // create an instance of MyClass using the service provider
+                    _static = ActivatorUtilities.CreateInstance<DataProtect>(services);
+
+                }
+                return _static;
+            }
+        }
+
+        private readonly IDataProtector protector;
+        private readonly IDataProtectionProvider provider;
+
+        public DataProtect(IDataProtectionProvider provider)
+        {
+            this.provider = provider;
+            this.protector = provider.CreateProtector(this.GetType().FullName + "$GLOBAL");
+        }
+
+        public string Protect(string value)
+        {
+            return protector.Protect(value);                        
+        }
+
+        public string Unprotect(string pv)
+        {
+            var r = protector.Unprotect(pv);
+            return r;
+        }
+    }
+}

Blog3000/Server/Utils/MySyslog5424v1Logger.cs

@@ -0,0 +1,58 @@
+using Microsoft.Extensions.Logging;
+
+using Syslog.Framework.Logging;
+using Syslog.Framework.Logging.TransportProtocols;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Transactions;
+
+namespace Blog3000.Server.Utils
+{
+    public class MySyslog5424v1Logger: Syslog5424v1Logger		
+    {
+
+		private readonly string appName;
+		private readonly SyslogLoggerSettings settings;
+
+		public MySyslog5424v1Logger(string name, SyslogLoggerSettings settings, string appName, string host, LogLevel lvl, IMessageSender messageSender)
+			: base(name, settings, host, lvl, messageSender)
+		{
+			this.settings = settings;
+			this.appName = appName;
+		}
+
+		// Duplicated due to visibility limitations
+		internal enum SeverityType { Emergency, Alert, Critical, Error, Warning, Notice, Informational, Debug };
+
+		protected override string FormatMessage(int priority, DateTime now, string host, string name, int? procid, int msgid, string message)
+		{
+
+			int level = priority - ((int)settings.FacilityType * 8);
+			string flag = "-";
+			switch(level)
+            {
+				case (int)SeverityType.Alert:
+				case (int)SeverityType.Critical:
+				case (int)SeverityType.Error:
+					flag = "!";
+					break;
+				case (int)SeverityType.Warning:
+					flag = "?";
+					break;
+				case (int)SeverityType.Notice:
+					flag = "*";
+					break;
+				case (int)SeverityType.Debug:
+				case (int)SeverityType.Informational:
+					flag = "-";
+					break;
+			}
+
+
+			//System.IO.File.AppendAllText("/tmp/D", $"....{message}....\n");
+			return base.FormatMessage(priority, now, host, appName, procid, msgid, $"{flag} {(name??"").Replace("Blog3000.Server.", "")}: {message}"/* message*/);			
+		}
+	}
+}

Blog3000/Server/Utils/MySyslogLoggerProvider.cs

@@ -0,0 +1,44 @@
+using Microsoft.Extensions.Logging;
+using Syslog.Framework.Logging;
+using Syslog.Framework.Logging.TransportProtocols;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+
+namespace Blog3000.Server.Utils
+{
+    public class MySyslogLoggerProvider: ILoggerProvider
+    {
+		private readonly SyslogLoggerSettings _settings;
+		private readonly string _appName;
+		private readonly string _hostName;
+		private readonly LogLevel _logLevel;
+		private readonly IDictionary<string, ILogger> _loggers;
+		private readonly IMessageSender _messageSender;
+
+		public MySyslogLoggerProvider(SyslogLoggerSettings settings, string appName, string hostName, LogLevel logLevel)
+		{
+			_appName = appName;
+			_settings = settings;
+			_hostName = hostName;
+			_logLevel = logLevel;
+			_messageSender = settings.CustomMessageSender ?? new Syslog.Framework.Logging.TransportProtocols.UnixSockets.UnixSocketMessageSender(settings.UnixSocketPath);
+			_loggers = new Dictionary<string, ILogger>();
+		}
+
+		public ILogger CreateLogger(string name)
+		{
+			if (!_loggers.ContainsKey(name))
+				_loggers[name] = new MySyslog5424v1Logger(name, _settings, _appName, _hostName, _logLevel, _messageSender);
+
+			return _loggers[name];
+		}
+
+		public void Dispose()
+		{
+			_loggers.Clear();
+		}
+	}
+}

Blog3000/Server/app_data/blogconfig.json

@@ -0,0 +1,32 @@
+{
+  "Protected": {
+    "TwitterAPIKey": "CfDJ8Lcd8ISBjudOkVhTjUBVmCpHmof5a6dBh8hYk6qwVvTpIX4Rp1CwBAEXQhsahtX_YlG6YA-zx1ZjfV9N4umwS89WhXCV7gvwnWt72mWyJhjNx7M1pHutyy8eBo_W_Pa74qfKERhtfT_AYbSFFXQO4QU",
+    "TwitterAPISecret": "CfDJ8Lcd8ISBjudOkVhTjUBVmCrk_bMRGTPr6sTOgbC2yjwwpdnIMLk5I75nmCLCwthMa1xCjJp3m4CT1qqEodS91Z2h1blcalvv_J7XBLz7E57Se0IxTHLEjFsHK6ilPr7rsOYdskZknSz7iVkcNMnH2J3X_nnH0veusO0FLQV_iBdzperRZqv99MrYB239-e0k6A",
+    "TwitterAccessToken": "CfDJ8Lcd8ISBjudOkVhTjUBVmCpGlciAw4J99-w-SJxNrSrnahyTHsv7p2qsXYYhE2kTSluZh5jlY5rY_uCUdNfHCwaYxddfV656_OlyQz1SRnMHn0DuGaoqtL2BNec9cP3-EHflpljqGsAyH-jOMOOw7flWct9IE_Dl6x-c1NUgQ4WF14yu1ffJ-jm6vTfAuZaJIw",
+    "TwitterAccessSecret": "CfDJ8Lcd8ISBjudOkVhTjUBVmCpn-7jMaHfrY9bLYS_Uq_JGW6O08FKXEwuexr1W45bSVvCsHozPJoMbMfkazchYKRxzyPbC3j6RujShD1USz82m8ZurniJD13WudkxwXkgW0xK0S5GnrLi_x9bVvCfwy0voMujGvVuhlvyAW7Azxz6Y"
+  },
+  "TwitterEnabled": false,
+  "TwitterTestMode": false,
+  "EnableSyslog": false,
+  "PublicDlUri": "https://cdn.mh3000.net/blogdl",
+  "AllowSearchBots": false,
+  "AllowSearchDevBot": true,
+  "VisibleUrlPrefix": "https://localhost:5001",
+  "XListenPort": 5001,
+  "Title": "blog.mh3000.net",
+  "DefaultEMailAddress": "hoess@gmx.net",
+  "AuthorFullnames": {
+    "mh": "Michael Höß"
+  },
+  "SocialLinks": {
+    "My Git": "https://gitea.mh3000.net"
+  },
+  "TopTopics": [
+    "#BLOG",
+    "#LINUX",
+    "#NETCORE",
+    "#NETWORK",
+    "#WINDOWS",
+    "#VOIP"
+  ]
+}

Blog3000/Server/app_data/checksumcache.json

@@ -0,0 +1 @@
+{"1i1n1BMmusP":"RR8PT2neqSJeCclX7aigPcvVNge6ZI8Wurwret5vCFQ=","1i1n1BMmusS":"kHpDUuPSbtAEYuDxkw8NHfz4roC7Nn6vMTqjHgnPCCg=","1i1n1BMmusU":"/qoqCfqgr36blV\u002B1xhgeQCvuUgD\u002BqHgTbQpRvhNXhVw=","1i1n1BMmusW":"W5e3YmPG/YgHnvW3g1PQ8vrwUhSy7JWHoC8d\u002BSARPSY=","1i1n1BMmusY":"OihKAPm\u002Bma7T2MJ0YRrJeWUS/1FGkFaFCnMH/YRa8Wc=","1i1n1BMmusa":"trux1I548o6M0fzmVbhAPyOFdkDshVzOHuR3I4bnWZE=","1i1n1BMmusc":"a2ZCKKBV\u002BwLcRrySVEv1uYYXmyedDXfTQvg0Zsr3Hy0=","1i1n1BMmuse":"ZGUy0vCDVzmIYtzsYcDlh/SQhWjhUuJU97XURl/1BzQ=","1i1n1BMmush":"tRb0s3OwKdgyus7n23f41NaWlLNx61wCTPtdpWT5KZk=","1i1n1BMmusj":"bvZpleYzMtWGz1QLlmUTSdrDfgqyTCtI31W/0E54qpY=","1i1n1BMmusl":"0yzW6JVA61SAXVSU8jpBGnkgSEIc3mdMadZAWfIyd9A=","1i1n1BMmusn":"k6XL\u002BnNh3f6yNS6GeGq73aBY\u002BRisyyN4jNyig/R5C24=","1i1n1BMmusp":"10r86/NdGinjNtn/MsbZLkpw60uz9bxDDXbaMRCV6kY=","1i1n1BMmusr":"hrAnrFdVi6X8Nqp74MByQyglgDySa\u002B8I1Q4mSq/3n5k=","1i1n1BMmust":"CR8ICQJG715x\u002BctDDXDB8XvBmAmmIYZ0nSk1IGJxUJs=","1i1n1BDwtO6":"G\u002Bf6WXFouQnSDCEF47vpGzJDm6itTuOl6huh3D/eR24=","1i1n1BKuvCw":"x04AQ\u002BPxTDvun07NFtnIWd10x7nBWi\u002BVb81pjqCMUtI="}

Blog3000/Server/app_data/posts/mh/00template.md

@@ -0,0 +1,9 @@
+@Id:1i1n1BKuejL
+@Revision:19.05.2020 19:09:37|Desc|mh
+@Author:mh
+@Title:Hello world!!
+@Abstract:
+@Access:
+@Topics:#
+@StickMenuPos:-1
+@Draft

Blog3000/Server/app_data/posts/mh/a1.md

@@ -0,0 +1,7 @@
+@Id:1i1n1BMmusP
+@Revision:19.05.2020 19:04:30|Initial|mh
+@Author:mh
+@Title:A1
+@Abstract:A1
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR

Blog3000/Server/app_data/posts/mh/a10.md

@@ -0,0 +1,7 @@
+@Id:1i1n1BMmusS
+@Revision:19.05.2020 19:04:30|Initial|mh
+@Author:mh
+@Title:A10
+@Abstract:A10
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR

Blog3000/Server/app_data/posts/mh/a11.md

@@ -0,0 +1,7 @@
+@Id:1i1n1BMmusU
+@Revision:19.05.2020 19:04:30|Initial|mh
+@Author:mh
+@Title:A11
+@Abstract:A11
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR

Blog3000/Server/app_data/posts/mh/a12.md

@@ -0,0 +1,7 @@
+@Id:1i1n1BMmusW
+@Revision:19.05.2020 19:04:30|Initial|mh
+@Author:mh
+@Title:A12
+@Abstract:A12
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR

Blog3000/Server/app_data/posts/mh/a13.md

@@ -0,0 +1,11 @@
+@Id:1i1n1BMmusY
+@Revision:19.05.2020 19:04:30|Initial|mh
+@Author:mh
+@Title:A13
+@Abstract:A13
+@Lang:de
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR
+
+
+Update2!!!

Blog3000/Server/app_data/posts/mh/a14.md

@@ -0,0 +1,7 @@
+@Id:1i1n1BMmusa
+@Revision:19.05.2020 19:04:30|Initial|mh
+@Author:mh
+@Title:A14DFXX
+@Abstract:A14
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR

Blog3000/Server/app_data/posts/mh/a15.md

@@ -0,0 +1,7 @@
+@Id:1i1n1BMmusc
+@Revision:19.05.2020 19:04:30|Initial|mh
+@Author:mh
+@Title:A15
+@Abstract:A15
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR

Blog3000/Server/app_data/posts/mh/a2.md

@@ -0,0 +1,13 @@
+@Id:1i1n1BMmuse
+@Revision:19.05.2020 19:05:47|Initial|mh
+@Revision:19.05.2020 19:09:37|Desc|mh
+@Author:mh
+@Title:A2
+@Abstract:A2 Abstract lorem ipsum
+@Access:PUBLIC
+@Topics:#BLOG|#GENTOO|#NETCORE|#BLAZOR
+
+
+# Lorem
+
+Lorem ipsum