Move Middleware to Jellyfin.Api

Jellyfin.Api/Middleware/LanFilteringMiddleware.cs

@@ -0,0 +1,45 @@
+using System.Net;
+using System.Threading.Tasks;
+using Jellyfin.Networking.Configuration;
+using MediaBrowser.Common.Net;
+using MediaBrowser.Controller.Configuration;
+using Microsoft.AspNetCore.Http;
+
+namespace Jellyfin.Api.Middleware
+{
+    /// <summary>
+    /// Validates the LAN host IP based on application configuration.
+    /// </summary>
+    public class LanFilteringMiddleware
+    {
+        private readonly RequestDelegate _next;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LanFilteringMiddleware"/> class.
+        /// </summary>
+        /// <param name="next">The next delegate in the pipeline.</param>
+        public LanFilteringMiddleware(RequestDelegate next)
+        {
+            _next = next;
+        }
+
+        /// <summary>
+        /// Executes the middleware action.
+        /// </summary>
+        /// <param name="httpContext">The current HTTP context.</param>
+        /// <param name="networkManager">The network manager.</param>
+        /// <param name="serverConfigurationManager">The server configuration manager.</param>
+        /// <returns>The async task.</returns>
+        public async Task Invoke(HttpContext httpContext, INetworkManager networkManager, IServerConfigurationManager serverConfigurationManager)
+        {
+            var host = httpContext.Connection.RemoteIpAddress ?? IPAddress.Loopback;
+
+            if (!networkManager.IsInLocalNetwork(host) && !serverConfigurationManager.GetNetworkConfiguration().EnableRemoteAccess)
+            {
+                return;
+            }
+
+            await _next(httpContext).ConfigureAwait(false);
+        }
+    }
+}