Move Middleware to Jellyfin.Api

Jellyfin.Api/Middleware/BaseUrlRedirectionMiddleware.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Threading.Tasks;
+using Jellyfin.Networking.Configuration;
+using MediaBrowser.Controller.Configuration;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using static MediaBrowser.Controller.Extensions.ConfigurationExtensions;
+
+namespace Jellyfin.Api.Middleware
+{
+    /// <summary>
+    /// Redirect requests without baseurl prefix to the baseurl prefixed URL.
+    /// </summary>
+    public class BaseUrlRedirectionMiddleware
+    {
+        private readonly RequestDelegate _next;
+        private readonly ILogger<BaseUrlRedirectionMiddleware> _logger;
+        private readonly IConfiguration _configuration;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="BaseUrlRedirectionMiddleware"/> class.
+        /// </summary>
+        /// <param name="next">The next delegate in the pipeline.</param>
+        /// <param name="logger">The logger.</param>
+        /// <param name="configuration">The application configuration.</param>
+        public BaseUrlRedirectionMiddleware(
+            RequestDelegate next,
+            ILogger<BaseUrlRedirectionMiddleware> logger,
+            IConfiguration configuration)
+        {
+            _next = next;
+            _logger = logger;
+            _configuration = configuration;
+        }
+
+        /// <summary>
+        /// Executes the middleware action.
+        /// </summary>
+        /// <param name="httpContext">The current HTTP context.</param>
+        /// <param name="serverConfigurationManager">The server configuration manager.</param>
+        /// <returns>The async task.</returns>
+        public async Task Invoke(HttpContext httpContext, IServerConfigurationManager serverConfigurationManager)
+        {
+            var localPath = httpContext.Request.Path.ToString();
+            var baseUrlPrefix = serverConfigurationManager.GetNetworkConfiguration().BaseUrl;
+
+            if (string.IsNullOrEmpty(localPath)
+                || string.Equals(localPath, baseUrlPrefix, StringComparison.OrdinalIgnoreCase)
+                || string.Equals(localPath, baseUrlPrefix + "/", StringComparison.OrdinalIgnoreCase)
+                || string.Equals(localPath, baseUrlPrefix + "/web", StringComparison.OrdinalIgnoreCase)
+                || string.Equals(localPath, baseUrlPrefix + "/web/", StringComparison.OrdinalIgnoreCase)
+                || !localPath.StartsWith(baseUrlPrefix, StringComparison.OrdinalIgnoreCase)
+               )
+            {
+                // Redirect health endpoint
+                if (string.Equals(localPath, "/health", StringComparison.OrdinalIgnoreCase)
+                    || string.Equals(localPath, "/health/", StringComparison.OrdinalIgnoreCase))
+                {
+                    _logger.LogDebug("Redirecting /health check");
+                    httpContext.Response.Redirect(baseUrlPrefix + "/health");
+                    return;
+                }
+
+                // Always redirect back to the default path if the base prefix is invalid or missing
+                _logger.LogDebug("Normalizing an URL at {LocalPath}", localPath);
+
+                var port = httpContext.Request.Host.Port ?? -1;
+                var uri = new UriBuilder(httpContext.Request.Scheme, httpContext.Request.Host.Host, port, localPath).Uri;
+                var redirectUri = new UriBuilder(httpContext.Request.Scheme, httpContext.Request.Host.Host, port, baseUrlPrefix + "/" + _configuration[DefaultRedirectKey]).Uri;
+                var target = uri.MakeRelativeUri(redirectUri).ToString();
+                _logger.LogDebug("Redirecting to {Target}", target);
+
+                httpContext.Response.Redirect(target);
+                return;
+            }
+
+            await _next(httpContext).ConfigureAwait(false);
+        }
+    }
+}