1 files changed, 49 insertions, 0 deletions
diff --git a/Jellyfin.Api/Middleware/LanFilteringMiddleware.cs b/Jellyfin.Api/Middleware/LanFilteringMiddleware.cs
new file mode 100644
index 000000000..9c2194faf
--- /dev/null
+++ b/Jellyfin.Api/Middleware/LanFilteringMiddleware.cs
@@ -0,0 +1,49 @@
+using System.Threading.Tasks;
+using Jellyfin.Networking.Configuration;
+using MediaBrowser.Common.Extensions;
+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)
+    {
+        if (serverConfigurationManager.GetNetworkConfiguration().EnableRemoteAccess)
+        {
+            await _next(httpContext).ConfigureAwait(false);
+            return;
+        }
+
+        var host = httpContext.GetNormalizedRemoteIp();
+        if (!networkManager.IsInLocalNetwork(host))
+        {
+            return;
+        }
+
+        await _next(httpContext).ConfigureAwait(false);
+    }
+}