Modify controller to routing-based bot assignation

tests/Microsoft.Bot.Builder.TestBot/Controllers/BotController.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
+using System;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Bot.Builder;
@@ -11,24 +12,28 @@ namespace Microsoft.BotBuilderSamples
     // This ASP Controller is created to handle a request. Dependency Injection will provide the Adapter and IBot
     // implementation at runtime. Multiple different IBot implementations running at different endpoints can be
     // achieved by specifying a more specific type for the bot constructor argument.
-    [Route("api/messages")]
+    [Route("api")]
     [ApiController]
     public class BotController : ControllerBase
     {
         private readonly IBotFrameworkHttpAdapter _adapter;
-        private readonly IBot _bot;
+        private IBot _bot;
+        private readonly Func<string, IBot> _service;
 
-        public BotController(IBotFrameworkHttpAdapter adapter, IBot bot)
+        public BotController(IBotFrameworkHttpAdapter adapter, Func<string, IBot> service)
         {
             _adapter = adapter;
-            _bot = bot;
+            _service = service;
         }
 
+        [Route("{*botname}")]
         [HttpPost]
-        public async Task PostAsync()
+        public async Task PostAsync(string botname)
         {
             // Delegate the processing of the HTTP POST to the adapter.
             // The adapter will invoke the bot.
+            _bot = _service(botname) ?? throw new Exception($"The endpoint '{botname}' is not associated with a bot.");
+
             await _adapter.ProcessAsync(Request, Response, _bot);
         }
     }