From fe8fa736921c17aa5a1cb04fbfae569b5add40a4 Mon Sep 17 00:00:00 2001
From: Michal Vrba <m.vrba@retailsoft.sk>
Date: Fri, 30 Jan 2026 17:26:01 +0100
Subject: [PATCH] Add SignalR/WebSocket config and large upload support

Configured SignalR and WebSockets for improved reliability and large content handling. Added appsettings and web.config for production/IIS, including increased timeouts, message size limits, and security/compression settings. Added fallback to Long Polling if WebSockets fail.
---
 Notemark/Components/App.razor |  9 ++++
 Notemark/Program.cs           | 17 +++++++
 appsettings.Production.json   | 16 ++++++
 appsettings.json              | 54 ++++++++++++++++++++
 web.config                    | 96 +++++++++++++++++++++++++++++++++++
 5 files changed, 192 insertions(+)
 create mode 100644 appsettings.Production.json
 create mode 100644 appsettings.json
 create mode 100644 web.config

diff --git a/Notemark/Components/App.razor b/Notemark/Components/App.razor
index 81f5fa8..ab414e3 100644
--- a/Notemark/Components/App.razor
+++ b/Notemark/Components/App.razor
@@ -24,6 +24,15 @@
         document.addEventListener('DOMContentLoaded', function() {
             notemarkTheme.init();
         });
+        
+        // Force Long Polling if WebSockets fail (temporary fix)
+        Blazor.start({
+            configureSignalR: function (builder) {
+                builder.withUrl("/_blazor", {
+                    transport: 1 // LongPolling = 1, WebSockets = 4
+                });
+            }
+        });
     </script>
 </body>
 
diff --git a/Notemark/Program.cs b/Notemark/Program.cs
index 0adda16..feab57c 100644
--- a/Notemark/Program.cs
+++ b/Notemark/Program.cs
@@ -15,6 +15,16 @@ builder.Services.AddSingleton<IMarkdownService, MarkdownService>();
 builder.Services.AddScoped<ISessionService, SessionService>();
 builder.Services.AddScoped<IShareService, ShareService>();
 
+// Configure SignalR for better WebSocket support
+builder.Services.AddSignalR(options =>
+{
+    // Increase timeouts for large content
+    options.ClientTimeoutInterval = TimeSpan.FromMinutes(2);
+    options.KeepAliveInterval = TimeSpan.FromSeconds(30);
+    options.HandshakeTimeout = TimeSpan.FromSeconds(30);
+    options.MaximumReceiveMessageSize = 1024 * 1024; // 1MB
+});
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.
@@ -27,6 +37,13 @@ if (!app.Environment.IsDevelopment())
 app.UseStatusCodePagesWithReExecute("/not-found", createScopeForStatusCodePages: true);
 app.UseHttpsRedirection();
 
+// Enable WebSockets
+app.UseWebSockets(new WebSocketOptions
+{
+    KeepAliveInterval = TimeSpan.FromMinutes(2),
+    ReceiveBufferSize = 4 * 1024
+});
+
 // Enable cookies for session management
 app.UseCookiePolicy(new CookiePolicyOptions
 {
diff --git a/appsettings.Production.json b/appsettings.Production.json
new file mode 100644
index 0000000..bb9a44a
--- /dev/null
+++ b/appsettings.Production.json
@@ -0,0 +1,16 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Warning",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.AspNetCore.SignalR": "Warning",
+      "Microsoft.AspNetCore.Http.Connections": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*",
+  
+  "SignalR": {
+    "EnableDetailedErrors": false
+  }
+}
\ No newline at end of file
diff --git a/appsettings.json b/appsettings.json
new file mode 100644
index 0000000..7a9919c
--- /dev/null
+++ b/appsettings.json
@@ -0,0 +1,54 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.AspNetCore.SignalR": "Information",
+      "Microsoft.AspNetCore.Http.Connections": "Information"
+    },
+    "Console": {
+      "IncludeScopes": false,
+      "LogLevel": {
+        "Default": "Warning"
+      }
+    }
+  },
+  "AllowedHosts": "*",
+  
+  "Kestrel": {
+    "Limits": {
+      "MaxRequestBodySize": 104857600,
+      "RequestHeadersTimeout": "00:01:00",
+      "KeepAliveTimeout": "00:02:00",
+      "MaxRequestHeaderCount": 100,
+      "MaxRequestHeadersTotalSize": 65536,
+      "MaxRequestLineSize": 8192,
+      "MaxRequestBufferSize": 1048576,
+      "MaxResponseBufferSize": 1048576
+    },
+    "EndPoints": {
+      "Http": {
+        "Url": "http://localhost:5000"
+      }
+    }
+  },
+  
+  "SignalR": {
+    "SupportedProtocols": [ "WebSockets", "LongPolling" ],
+    "ClientTimeoutInterval": "00:02:00",
+    "KeepAliveInterval": "00:00:30",
+    "HandshakeTimeout": "00:00:30",
+    "MaximumReceiveMessageSize": 1048576,
+    "StreamBufferCapacity": 10,
+    "EnableDetailedErrors": false
+  },
+  
+  "ConnectionStrings": {},
+  
+  "AppSettings": {
+    "DataPath": "data",
+    "MaxFileSize": 104857600,
+    "SessionTimeout": "30.00:00:00",
+    "ShareTokenExpiry": "365.00:00:00"
+  }
+}
\ No newline at end of file
diff --git a/web.config b/web.config
new file mode 100644
index 0000000..de65e79
--- /dev/null
+++ b/web.config
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <location path="." inheritInChildApplications="false">
+    <system.webServer>
+      <handlers>
+        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
+      </handlers>
+      
+      <aspNetCore processPath="dotnet" 
+                  arguments=".\Notemark.dll" 
+                  stdoutLogEnabled="false" 
+                  stdoutLogFile=".\logs\stdout" 
+                  hostingModel="inprocess"
+                  requestTimeout="00:05:00">
+        <environmentVariables>
+          <environmentVariable name="ASPNETCORE_ENVIRONMENT" value="Production" />
+          <environmentVariable name="ASPNETCORE_HTTP_TIMEOUT" value="300" />
+        </environmentVariables>
+      </aspNetCore>
+      
+      <!-- WebSocket support for Blazor Server -->
+      <webSocket enabled="true" 
+                 receiveBufferLimit="4194304"
+                 pingInterval="00:01:00" />
+      
+      <!-- Configuration for larger files -->
+      <security>
+        <requestFiltering>
+          <requestLimits maxAllowedContentLength="104857600" 
+                         maxQueryString="8192" 
+                         maxUrl="8192" />
+        </requestFiltering>
+      </security>
+      
+      <!-- HTTP protocol configuration -->
+      <httpProtocol>
+        <customHeaders>
+          <add name="Connection" value="Keep-Alive" />
+          <add name="X-Content-Type-Options" value="nosniff" />
+          <add name="X-Frame-Options" value="SAMEORIGIN" />
+          <add name="X-XSS-Protection" value="1; mode=block" />
+        </customHeaders>
+      </httpProtocol>
+      
+      <!-- URL Rewrite for WebSockets and SPA routing -->
+      <rewrite>
+        <rules>
+          <rule name="WebSocket Support" enabled="true" stopProcessing="true">
+            <match url="(.*)" />
+            <conditions>
+              <add input="{HTTP_UPGRADE}" pattern="websocket" ignoreCase="true" />
+              <add input="{HTTP_CONNECTION}" pattern="upgrade" ignoreCase="true" />
+            </conditions>
+            <action type="None" />
+          </rule>
+        </rules>
+      </rewrite>
+      
+      <!-- Compression for better performance -->
+      <httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files">
+        <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
+        <dynamicTypes>
+          <add mimeType="text/*" enabled="true" />
+          <add mimeType="message/*" enabled="true" />
+          <add mimeType="application/javascript" enabled="true" />
+          <add mimeType="application/atom+xml" enabled="true" />
+          <add mimeType="application/xaml+xml" enabled="true" />
+          <add encoding="*" enabled="true" />
+        </dynamicTypes>
+        <staticTypes>
+          <add mimeType="text/*" enabled="true" />
+          <add mimeType="message/*" enabled="true" />
+          <add mimeType="application/javascript" enabled="true" />
+          <add mimeType="application/atom+xml" enabled="true" />
+          <add mimeType="application/xaml+xml" enabled="true" />
+          <add encoding="*" enabled="true" />
+        </staticTypes>
+      </httpCompression>
+      
+      <!-- Caching for static files -->
+      <staticContent>
+        <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="7.00:00:00" />
+      </staticContent>
+      
+    </system.webServer>
+  </location>
+  
+  <!-- Classic ASP.NET settings for compatibility -->
+  <system.web>
+    <httpRuntime maxRequestLength="102400" 
+                 executionTimeout="300" 
+                 enableVersionHeader="false" />
+    <compilation debug="false" />
+  </system.web>
+  
+</configuration>
\ No newline at end of file