displaying provider and version information on the index resource

Author: thefringeninja

src/SqlStreamStore.HAL/Index/IndexResource.cs

@@ -1,12 +1,41 @@
 namespace SqlStreamStore.HAL.Index
 {
+    using System;
+    using System.Reflection;
     using Halcyon.HAL;
+    using Newtonsoft.Json.Linq;
 
     internal class IndexResource : IResource
     {
         public SchemaSet Schema { get; }
 
-        public Response Get() => new HalJsonResponse(new HALResponse(null)
+        private readonly JObject _data;
+
+        public IndexResource(IStreamStore streamStore)
+        {
+            var streamStoreType = streamStore.GetType();
+            var streamStoreTypeName = streamStoreType.Name;
+            _data = JObject.FromObject(new
+            {
+                provider = streamStoreTypeName.Substring(0, streamStoreTypeName.Length - "StreamStore".Length),
+                versions = new
+                {
+                    streamStore = GetVersion(streamStoreType),
+                    server = GetVersion(typeof(IndexResource))
+                }
+            });
+        }
+
+        private static string GetVersion(Type type)
+            => type.Assembly
+                   .GetCustomAttribute<AssemblyInformationalVersionAttribute>()
+                   ?.InformationalVersion ??
+               type.Assembly
+                   .GetCustomAttribute<AssemblyVersionAttribute>()
+                   ?.Version
+               ?? "unknown";
+
+        public Response Get() => new HalJsonResponse(new HALResponse(_data)
             .AddLinks(
                 Links
                     .RootedAt(string.Empty)

src/SqlStreamStore.HAL/SqlStreamStoreHalMiddleware.cs

@@ -74,7 +74,7 @@ public static IApplicationBuilder UseSqlStreamStoreHal(
 
             options = options ?? new SqlStreamStoreMiddlewareOptions();
 
-            var index = new IndexResource();
+            var index = new IndexResource(streamStore);
             var allStream = new AllStreamResource(streamStore, options.UseCanonicalUrls);
             var allStreamMessages = new AllStreamMessageResource(streamStore);
             var streams = new StreamResource(streamStore);