Generate HTTP doc link behind proxy (#14)

* add test for doc link behind proxy

* handle x-forwarded-proto when generating doc link

NuGet.config

@@ -2,5 +2,6 @@
 <configuration>
   <packageSources>
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+    <add key="Rulesets" value="https://www.myget.org/F/tpluscode/api/v3/index.json" protocolVersion="3" />
   </packageSources>
 </configuration>

src/Argolis.Hydra.Nancy/RequestResponseExtensions.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using Nancy;
 
 namespace Argolis.Hydra.Nancy
@@ -46,6 +47,11 @@ public static string GetApiDocumentationUri(this Request request, string documen
                 Path = request.Url.BasePath + documentationPath
             };
 
+            if (request.Headers["X-Forwarded-Proto"].Contains("https", StringComparer.OrdinalIgnoreCase))
+            {
+                uriBuilder.Scheme = "https";
+            }
+
             string apiDocPath = uriBuilder.Uri.ToString();
             if (uriBuilder.Port == 80)
             {

src/Argolis.Tests/ApiDocumentation/RequestResponseExtensionsTests.cs

@@ -0,0 +1,33 @@
+using System.Collections.Generic;
+using Argolis.Hydra.Nancy;
+using FluentAssertions;
+using Nancy;
+using Xunit;
+
+namespace Argolis.Tests.ApiDocumentation
+{
+    public class RequestResponseExtensionsTests
+    {
+        [Theory]
+        [InlineData("https")]
+        [InlineData("HTTPS")]
+        public void GetApiDocumentationUri_should_honor_X_Forwarded_Proto(string proto)
+        {
+            // given
+            var headers = new Dictionary<string, IEnumerable<string>>
+            {
+                { "X-Forwarded-Proto", new[] { proto } }
+            };
+            var request = new Request(
+                "GET",
+                new Url("http://hydra.app/some/resource"),
+                headers: headers);
+
+            // when
+            var apiDocUri = request.GetApiDocumentationUri("/api/doc");
+
+            // then
+            apiDocUri.Should().Be("https://hydra.app/api/doc");
+        }
+    }
+}