Initial Push

src/Prowlarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs

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+using System;
+using System.IO;
+using Nancy;
+using Nancy.Responses;
+using NLog;
+using NzbDrone.Common.Disk;
+using NzbDrone.Common.EnvironmentInfo;
+
+namespace Prowlarr.Http.Frontend.Mappers
+{
+    public abstract class StaticResourceMapperBase : IMapHttpRequestsToDisk
+    {
+        private readonly IDiskProvider _diskProvider;
+        private readonly Logger _logger;
+        private readonly StringComparison _caseSensitive;
+
+        private static readonly NotFoundResponse NotFoundResponse = new NotFoundResponse();
+
+        protected StaticResourceMapperBase(IDiskProvider diskProvider, Logger logger)
+        {
+            _diskProvider = diskProvider;
+            _logger = logger;
+
+            _caseSensitive = RuntimeInfo.IsProduction ? DiskProviderBase.PathStringComparison : StringComparison.OrdinalIgnoreCase;
+        }
+
+        public abstract string Map(string resourceUrl);
+
+        public abstract bool CanHandle(string resourceUrl);
+
+        public virtual Response GetResponse(string resourceUrl)
+        {
+            var filePath = Map(resourceUrl);
+
+            if (_diskProvider.FileExists(filePath, _caseSensitive))
+            {
+                var response = new StreamResponse(() => GetContentStream(filePath), MimeTypes.GetMimeType(filePath));
+                return new MaterialisingResponse(response);
+            }
+
+            _logger.Warn("File {0} not found", filePath);
+
+            return NotFoundResponse;
+        }
+
+        protected virtual Stream GetContentStream(string filePath)
+        {
+            return File.OpenRead(filePath);
+        }
+    }
+}