fix OAuth with emulator and no credentials (#4570)

Author: Tom Laird-McConnell

CSharp/EchoBot/Web.config

@@ -5,9 +5,12 @@
   -->
 <configuration>
   <appSettings>
-	  <add key="BotId" value="LoadEchoBot" />
-	  <add key="MicrosoftAppId" value="aeb40bdb-fffe-48e2-8650-921c7de13383" />
-	  <add key="MicrosoftAppPassword" value="hywgFM57]acaZWCLM348=[[" />
+	  <add key="BotId" value="TomDemoBot" />
+	  <add key="MicrosoftAppId" value="76a09a21-e91c-4396-bef6-b3a785c78cad" />
+	  <add key="MicrosoftAppPassword" value="M1tW7XhYe6.O0&amp;-O" />
+	  <!--<add key="BotId" value="YourBotId" />
+	  <add key="MicrosoftAppId" value="" />
+	  <add key="MicrosoftAppPassword" value="" />-->
   </appSettings>
   <system.web>
     <compilation debug="true" targetFramework="4.6.1" />

CSharp/Library/Microsoft.Bot.Builder/ConnectorEx/IConnectorClientFactory.cs

@@ -114,30 +114,34 @@ public ConnectorClientFactory(IAddress address, MicrosoftAppCredentials credenti
 
             if (!oauthClients.TryGetValue(key, out oauthClient))
             {
-                if (IsEmulator(this.address) && emulateOAuthCards.Value)
+                // only create the oauthclient if we have credentials
+                if (!String.IsNullOrEmpty(credentials?.MicrosoftAppId) && !String.IsNullOrEmpty(credentials?.MicrosoftAppPassword))
                 {
-                    // for emulator using emulated OAuthCards we should use serviceUri of the emulator
-                    oauthClient = new OAuthClient(this.serviceUri, this.credentials);
-                }
-                else
-                {
-                    if (!string.IsNullOrEmpty(settingsOAuthApiUrl.Value))
+                    if (IsEmulator(this.address) && emulateOAuthCards.Value)
                     {
-                        oauthClient = new OAuthClient(new Uri(settingsOAuthApiUrl.Value), this.credentials);
+                        // for emulator using emulated OAuthCards we should use serviceUri of the emulator
+                        oauthClient = new OAuthClient(this.serviceUri, this.credentials);
                     }
                     else
                     {
-                        oauthClient = new OAuthClient(this.credentials);
+                        if (!string.IsNullOrEmpty(settingsOAuthApiUrl.Value))
+                        {
+                            oauthClient = new OAuthClient(new Uri(settingsOAuthApiUrl.Value), this.credentials);
+                        }
+                        else
+                        {
+                            oauthClient = new OAuthClient(this.credentials);
+                        }
                     }
-                }
 
-                if (IsEmulator(this.address))
-                {
-                    // Send the mode notification (emulated OAuthCards or not) to the emulator
-                    Task.Run(async () => await oauthClient.OAuthApi.SendEmulateOAuthCardsAsync(emulateOAuthCards.Value).ConfigureAwait(false)).Wait();
-                }
+                    if (IsEmulator(this.address))
+                    {
+                        // Send the mode notification (emulated OAuthCards or not) to the emulator
+                        Task.Run(async () => await oauthClient.OAuthApi.SendEmulateOAuthCardsAsync(emulateOAuthCards.Value).ConfigureAwait(false)).Wait();
+                    }
 
-                oauthClients[key] = oauthClient;
+                    oauthClients[key] = oauthClient;
+                }
             }
         }
 
@@ -207,7 +211,7 @@ private static bool GetEmulateOAuthCardsSetting(string key = "EmulateOAuthCards"
                 // default back to false
                 result = false;
             }
-            
+
             return result;
         }
     }