Initial commit.

Wino.Core/Http/GmailClientMessageHandler.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Google.Apis.Http;
+using Wino.Core.Domain.Entities;
+
+namespace Wino.Core.Http
+{
+    internal class GmailClientMessageHandler : ConfigurableMessageHandler
+    {
+        public Func<Task<TokenInformation>> TokenRetrieveDelegate { get; }
+
+        public GmailClientMessageHandler(Func<Task<TokenInformation>> tokenRetrieveDelegate) : base(new HttpClientHandler())
+        {
+            TokenRetrieveDelegate = tokenRetrieveDelegate;
+        }
+
+        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            var tokenizationTask = TokenRetrieveDelegate.Invoke();
+            var tokenInformation = await tokenizationTask;
+
+            request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", tokenInformation.AccessToken);
+
+            return await base.SendAsync(request, cancellationToken);
+        }
+    }
+}