Initial commit carried over from private repo. This is V2.

code/MessengerApi.Contracts.MessageParser/IMessageParser.cs

@@ -0,0 +1,22 @@
+namespace MessengerApi.Contracts.MessageParser
+{
+    /// <summary>
+    /// A tool that helps converting POCO request/response models into <see cref="InboxMessage"/>, <see cref="OutboxMessage"/> and back.
+    /// </summary>
+    /// <remarks>
+    /// If you implement this, it's gonna be a lot easier for you to translate 
+    /// dumb request class into <see cref="OutboxMessage"/>, then convert 
+    /// <see cref="InboxMessage"/> back to request at server-side, and do the
+    /// same with the response all the way down to the client.
+    /// </remarks>
+    public interface IMessageParser<TRequest, TResponse>
+    {
+        OutboxMessage GetMessageFromRequest(TRequest request, int targetUserId);
+
+        TRequest GetRequestFromMessage(InboxMessage message);
+
+        OutboxMessage GetMessageFromResponse(TResponse response, string apiKey, int targetUserId, InboxMessage requestOrigin = null);
+
+        TResponse GetResponseFromMessage(InboxMessage message);
+    }
+}