Fixed: Posters not always showing when searching for movie

Fixes #4729
Fixes #4704

src/Radarr.Http/Frontend/Mappers/MediaCoverMapper.cs

@@ -43,7 +43,7 @@ namespace Radarr.Http.Frontend.Mappers
 
         public override bool CanHandle(string resourceUrl)
         {
-            return resourceUrl.StartsWith("/MediaCover", StringComparison.InvariantCultureIgnoreCase);
+            return resourceUrl.StartsWith("/MediaCover/", StringComparison.InvariantCultureIgnoreCase);
         }
     }
 }

src/Radarr.Http/Frontend/Mappers/MediaCoverProxyMapper.cs

@@ -0,0 +1,48 @@
+using System;
+using System.IO;
+using System.Text.RegularExpressions;
+using Nancy;
+using Nancy.Responses;
+using NzbDrone.Core.MediaCover;
+
+namespace Radarr.Http.Frontend.Mappers
+{
+    public class MediaCoverProxyMapper : IMapHttpRequestsToDisk
+    {
+        private readonly Regex _regex = new Regex(@"/MediaCoverProxy/(?<hash>\w+)/(?<filename>(.+)\.(jpg|png|gif))");
+
+        private readonly IMediaCoverProxy _mediaCoverProxy;
+
+        public MediaCoverProxyMapper(IMediaCoverProxy mediaCoverProxy)
+        {
+            _mediaCoverProxy = mediaCoverProxy;
+        }
+
+        public string Map(string resourceUrl)
+        {
+            return null;
+        }
+
+        public bool CanHandle(string resourceUrl)
+        {
+            return resourceUrl.StartsWith("/MediaCoverProxy/", StringComparison.InvariantCultureIgnoreCase);
+        }
+
+        public Response GetResponse(string resourceUrl)
+        {
+            var match = _regex.Match(resourceUrl);
+
+            if (!match.Success)
+            {
+                return new NotFoundResponse();
+            }
+
+            var hash = match.Groups["hash"].Value;
+            var filename = match.Groups["filename"].Value;
+
+            var imageData = _mediaCoverProxy.GetImage(hash);
+
+            return new StreamResponse(() => new MemoryStream(imageData), MimeTypes.GetMimeType(filename));
+        }
+    }
+}