Migrate DlnaServerController to Jellyfin.Api

Jellyfin.Api/Attributes/HttpSubscribeAttribute.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Mvc.Routing;
+
+namespace Jellyfin.Api.Attributes
+{
+    /// <summary>
+    /// Identifies an action that supports the HTTP GET method.
+    /// </summary>
+    public class HttpSubscribeAttribute : HttpMethodAttribute
+    {
+        private static readonly IEnumerable<string> _supportedMethods = new[] { "SUBSCRIBE" };
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="HttpSubscribeAttribute"/> class.
+        /// </summary>
+        public HttpSubscribeAttribute()
+            : base(_supportedMethods)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="HttpSubscribeAttribute"/> class.
+        /// </summary>
+        /// <param name="template">The route template. May not be null.</param>
+        public HttpSubscribeAttribute(string template)
+            : base(_supportedMethods, template)
+        {
+            if (template == null)
+            {
+                throw new ArgumentNullException(nameof(template));
+            }
+        }
+    }
+}