Improved handling of the Preflight OPTIONS request.

src/NzbDrone.Api/Extensions/Pipelines/CacheHeaderPipeline.cs

@@ -23,6 +23,8 @@ namespace NzbDrone.Api.Extensions.Pipelines
 
         private void Handle(NancyContext context)
         {
+            if (context.Request.Method == "OPTIONS") return;
+
             if (_cacheableSpecification.IsCacheable(context))
             {
                 context.Response.Headers.EnableCache();
@@ -33,4 +35,4 @@ namespace NzbDrone.Api.Extensions.Pipelines
             }
         }
     }
-}
+}

src/NzbDrone.Api/Extensions/Pipelines/CorsPipeline.cs

@@ -12,9 +12,24 @@ namespace NzbDrone.Api.Extensions.Pipelines
 
         public void Register(IPipelines pipelines)
         {
+            pipelines.BeforeRequest.AddItemToEndOfPipeline(HandleRequest);
             pipelines.AfterRequest.AddItemToEndOfPipeline(HandleResponse);
         }
 
+        private Response HandleRequest(NancyContext context)
+        {
+            if (context == null || context.Request.Method != "OPTIONS")
+            {
+                return null;
+            }
+
+            var response = new Response()
+                .WithStatusCode(HttpStatusCode.OK)
+                .WithContentType("");
+            ApplyResponseHeaders(response, context.Request);
+            return response;
+        }
+
         private void HandleResponse(NancyContext context)
         {
             if (context == null || context.Response.Headers.ContainsKey(AccessControlHeaders.AllowOrigin))
@@ -45,18 +60,21 @@ namespace NzbDrone.Api.Extensions.Pipelines
         {
             response.Headers.Add(AccessControlHeaders.AllowOrigin, allowOrigin);
 
-            if (response.Headers.ContainsKey("Allow"))
+            if (request.Method == "OPTIONS")
             {
-                allowedMethods = response.Headers["Allow"];
-            }
+                if (response.Headers.ContainsKey("Allow"))
+                {
+                    allowedMethods = response.Headers["Allow"];
+                }
 
-            response.Headers.Add(AccessControlHeaders.AllowMethods, allowedMethods);
+                response.Headers.Add(AccessControlHeaders.AllowMethods, allowedMethods);
 
-            if (request.Headers[AccessControlHeaders.RequestHeaders].Any())
-            {
-                var requestedHeaders = request.Headers[AccessControlHeaders.RequestHeaders].Join(", ");
+                if (request.Headers[AccessControlHeaders.RequestHeaders].Any())
+                {
+                    var requestedHeaders = request.Headers[AccessControlHeaders.RequestHeaders].Join(", ");
 
-                response.Headers.Add(AccessControlHeaders.AllowHeaders, requestedHeaders);
+                    response.Headers.Add(AccessControlHeaders.AllowHeaders, requestedHeaders);
+                }
             }
         }
     }

src/NzbDrone.Api/Extensions/Pipelines/GZipPipeline.cs

@@ -33,7 +33,8 @@ namespace NzbDrone.Api.Extensions.Pipelines
             try
             {
                 if (
-                   !response.ContentType.Contains("image")
+                   response.Contents != Response.NoBody
+                && !response.ContentType.Contains("image")
                 && !response.ContentType.Contains("font")
                 && request.Headers.AcceptEncoding.Any(x => x.Contains("gzip"))
                 && !AlreadyGzipEncoded(response)
@@ -80,4 +81,4 @@ namespace NzbDrone.Api.Extensions.Pipelines
             return false;
         }
     }
-}
+}

src/NzbDrone.Integration.Test/CorsFixture.cs

@@ -8,30 +8,37 @@ namespace NzbDrone.Integration.Test
     [TestFixture]
     public class CorsFixture : IntegrationTest
     {
-        private RestRequest BuildRequest()
+        private RestRequest BuildGet(string route = "series")
         {
-            var request = new RestRequest("series");
+            var request = new RestRequest(route, Method.GET);
             request.AddHeader(AccessControlHeaders.RequestMethod, "POST");
 
             return request;
         }
 
+        private RestRequest BuildOptions(string route = "series")
+        {
+            var request = new RestRequest(route, Method.OPTIONS);
+
+            return request;
+        }
+
         [Test]
         public void should_not_have_allow_headers_in_response_when_not_included_in_the_request()
         {
-            var request = BuildRequest();
-            var response = RestClient.Get(request);
-            
+            var request = BuildOptions();
+            var response = RestClient.Execute(request);
+
             response.Headers.Should().NotContain(h => h.Name == AccessControlHeaders.AllowHeaders);
         }
 
         [Test]
         public void should_have_allow_headers_in_response_when_included_in_the_request()
         {
-            var request = BuildRequest();
+            var request = BuildOptions();
             request.AddHeader(AccessControlHeaders.RequestHeaders, "X-Test");
 
-            var response = RestClient.Get(request);
+            var response = RestClient.Execute(request);
 
             response.Headers.Should().Contain(h => h.Name == AccessControlHeaders.AllowHeaders);
         }
@@ -39,8 +46,8 @@ namespace NzbDrone.Integration.Test
         [Test]
         public void should_have_allow_origin_in_response()
         {
-            var request = BuildRequest();
-            var response = RestClient.Get(request);
+            var request = BuildOptions();
+            var response = RestClient.Execute(request);
 
             response.Headers.Should().Contain(h => h.Name == AccessControlHeaders.AllowOrigin);
         }
@@ -48,10 +55,37 @@ namespace NzbDrone.Integration.Test
         [Test]
         public void should_have_allow_methods_in_response()
         {
-            var request = BuildRequest();
-            var response = RestClient.Get(request);
+            var request = BuildOptions();
+            var response = RestClient.Execute(request);
 
             response.Headers.Should().Contain(h => h.Name == AccessControlHeaders.AllowMethods);
         }
+
+        [Test]
+        public void should_not_have_allow_methods_in_non_options_request()
+        {
+            var request = BuildGet();
+            var response = RestClient.Execute(request);
+
+            response.Headers.Should().NotContain(h => h.Name == AccessControlHeaders.AllowMethods);
+        }
+
+        [Test]
+        public void should_have_allow_origin_in_non_options_request()
+        {
+            var request = BuildGet();
+            var response = RestClient.Execute(request);
+
+            response.Headers.Should().Contain(h => h.Name == AccessControlHeaders.AllowOrigin);
+        }
+
+        [Test]
+        public void should_not_have_allow_origin_in_non_api_request()
+        {
+            var request = BuildGet("../abc");
+            var response = RestClient.Execute(request);
+
+            response.Headers.Should().NotContain(h => h.Name == AccessControlHeaders.AllowOrigin);
+        }
     }
 }