New: Use ASP.NET Core instead of Nancy

(cherry picked from commit 58ddbcd77e17ef95ecfad4b746084ee9326116f3)

src/Prowlarr.Http/Middleware/CacheableSpecification.cs

@@ -0,0 +1,74 @@
+using System;
+using Microsoft.AspNetCore.Http;
+using NzbDrone.Common.EnvironmentInfo;
+using NzbDrone.Common.Extensions;
+
+namespace Prowlarr.Http.Middleware
+{
+    public interface ICacheableSpecification
+    {
+        bool IsCacheable(HttpContext context);
+    }
+
+    public class CacheableSpecification : ICacheableSpecification
+    {
+        public bool IsCacheable(HttpContext context)
+        {
+            if (!RuntimeInfo.IsProduction)
+            {
+                return false;
+            }
+
+            if (context.Request.Query.ContainsKey("h"))
+            {
+                return true;
+            }
+
+            if (context.Request.Path.StartsWithSegments("/api", StringComparison.CurrentCultureIgnoreCase))
+            {
+                if (context.Request.Path.ToString().ContainsIgnoreCase("/MediaCover"))
+                {
+                    return true;
+                }
+
+                return false;
+            }
+
+            if (context.Request.Path.StartsWithSegments("/signalr", StringComparison.CurrentCultureIgnoreCase))
+            {
+                return false;
+            }
+
+            if (context.Request.Path.Equals("/index.js"))
+            {
+                return false;
+            }
+
+            if (context.Request.Path.Equals("/initialize.js"))
+            {
+                return false;
+            }
+
+            if (context.Request.Path.StartsWithSegments("/feed", StringComparison.CurrentCultureIgnoreCase))
+            {
+                return false;
+            }
+
+            if (context.Request.Path.StartsWithSegments("/log", StringComparison.CurrentCultureIgnoreCase) &&
+                context.Request.Path.ToString().EndsWith(".txt", StringComparison.CurrentCultureIgnoreCase))
+            {
+                return false;
+            }
+
+            if (context.Response != null)
+            {
+                if (context.Response.ContentType?.Contains("text/html") ?? false || context.Response.StatusCode >= 400)
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+    }
+}