Add support for specifying mime type directory in file APIs

Author: C0nquistadore

src/Dibix.Http.Server/Formatters/HttpFileResponseFormatter.cs

@@ -15,7 +15,7 @@ protected override object FormatResult(HttpActionDefinition actionDefinition, ob
             if (file == null)
                 return requestMessage.CreateResponse(HttpStatusCode.NotFound);
 
-            string mediaType = MimeTypes.GetMimeType(file.Type);
+            string mediaType = MimeTypes.IsRegistered(file.Type) ? file.Type : MimeTypes.GetMimeType(file.Type);
 
             HttpResponseMessage response = requestMessage.CreateResponse();
             response.Content = new ByteArrayContent(file.Data);

src/Dibix.Http.Server/Utilities/MimeTypes.cs

@@ -11,7 +11,7 @@ namespace Dibix.Http.Server
     internal static class MimeTypes
     {
         private const string DefaultMimeType = "application/octet-stream";
-        private static readonly IDictionary<string, string> _mappings = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        private static readonly IDictionary<string, string> MimeTypeMap = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
         {
             { "323", "text/h323" },
             { "3g2", "video/3gpp2" },
@@ -574,6 +574,9 @@ internal static class MimeTypes
             { "z", "application/x-compress" },
             { "zip", "application/x-zip-compressed" }
         };
+        private static readonly HashSet<string> AllMimeTypes = new HashSet<string>(MimeTypeMap.Values, StringComparer.OrdinalIgnoreCase);
+
+        public static bool IsRegistered(string mimeType) => AllMimeTypes.Contains(mimeType);
 
         public static string GetMimeType(string fileNameOrExtension)
         {
@@ -586,7 +589,7 @@ public static string GetMimeType(string fileNameOrExtension)
             fileNameOrExtension = fileNameOrExtension.TrimStart('.');
 
             string mimeType;
-            return _mappings.TryGetValue(fileNameOrExtension, out mimeType) ? mimeType : DefaultMimeType;
+            return MimeTypeMap.TryGetValue(fileNameOrExtension, out mimeType) ? mimeType : DefaultMimeType;
         }
     }
 }