From 1175ce3f97fdebc6fdb489ce65deaac59c7b7f87 Mon Sep 17 00:00:00 2001
From: crobibero <cody@robibe.ro>
Date: Tue, 21 Apr 2020 07:36:22 -0600
Subject: Add Exception Middleware

---
 Jellyfin.Server/Middleware/ExceptionMiddleware.cs | 60 +++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Jellyfin.Server/Middleware/ExceptionMiddleware.cs

(limited to 'Jellyfin.Server/Middleware')

diff --git a/Jellyfin.Server/Middleware/ExceptionMiddleware.cs b/Jellyfin.Server/Middleware/ExceptionMiddleware.cs
new file mode 100644
index 0000000000..39aace95d2
--- /dev/null
+++ b/Jellyfin.Server/Middleware/ExceptionMiddleware.cs
@@ -0,0 +1,60 @@
+using System;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Jellyfin.Api.Models.ExceptionDtos;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Server.Middleware
+{
+    /// <summary>
+    /// Exception Middleware.
+    /// </summary>
+    public class ExceptionMiddleware
+    {
+        private readonly RequestDelegate _next;
+        private readonly ILogger<ExceptionMiddleware> _logger;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ExceptionMiddleware"/> class.
+        /// </summary>
+        /// <param name="next">Next request delegate.</param>
+        /// <param name="loggerFactory">Instance of the <see cref="ILoggerFactory"/> interface.</param>
+        public ExceptionMiddleware(RequestDelegate next, ILoggerFactory loggerFactory)
+        {
+            _next = next ?? throw new ArgumentNullException(nameof(next));
+            _logger = loggerFactory.CreateLogger<ExceptionMiddleware>() ??
+                      throw new ArgumentNullException(nameof(loggerFactory));
+        }
+
+        /// <summary>
+        /// Invoke request.
+        /// </summary>
+        /// <param name="context">Request context.</param>
+        /// <returns>Task.</returns>
+        public async Task Invoke(HttpContext context)
+        {
+            try
+            {
+                await _next(context).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                if (context.Response.HasStarted)
+                {
+                    _logger.LogWarning("The response has already started, the exception middleware will not be executed.");
+                    throw;
+                }
+
+                var exceptionBody = new ExceptionDto { Message = ex.Message };
+                var exceptionJson = JsonSerializer.Serialize(exceptionBody);
+
+                context.Response.Clear();
+                context.Response.StatusCode = StatusCodes.Status500InternalServerError;
+                // TODO switch between PascalCase and camelCase
+                context.Response.ContentType = "application/json";
+                await context.Response.WriteAsync(exceptionJson).ConfigureAwait(false);
+            }
+        }
+    }
+}
-- 
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