Add default middleware to patch location of tenantId for MS Teams

libraries/botbuilder/src/botFrameworkAdapter.ts

@@ -145,6 +145,17 @@ export class BotFrameworkAdapter extends BotAdapter implements IUserTokenProvide
             this.credentials.oAuthEndpoint = GovernmentConstants.ToChannelFromBotLoginUrl;
             this.credentials.oAuthScope = GovernmentConstants.ToChannelFromBotOAuthScope;
         }
+
+        // Relocate the tenantId field used by MS Teams to a new location (from channelData to conversation)
+        // This will only occur on actities from teams that include tenant info in channelData but NOT in conversation,
+        // thus should be future friendly.  However, once the the transition is complete. we can remove this.
+        this.use(async(context, next) => {
+            if (context.activity.channelId === 'msteams' && context.activity && context.activity.conversation && !context.activity.conversation.tenantId && context.activity.channelData && context.activity.channelData.tenant) {
+                context.activity.conversation.tenantId = context.activity.channelData.tenant.id;
+            }
+            await next();
+        });
+
     }
 
     /**

libraries/botbuilder/tests/botFrameworkAdapter.test.js

@@ -251,6 +251,17 @@ describe(`BotFrameworkAdapter`, function () {
         });
     });
 
+    it(`should migrate location of tenantId for MS Teams processActivity().`, function (done) {
+        const incoming = TurnContext.applyConversationReference({ type: 'message', text: 'foo', channelData: { tenant: { id: '1234' } } }, reference, true);
+        const req = new MockBodyRequest(incoming);
+        const res = new MockResponse();
+        const adapter = new AdapterUnderTest();
+        adapter.processActivity(req, res, (context) => {
+            assert(context.activity.conversation.tenantId === '1234', `should have copied tenant id from channelData to conversation address`);
+            done();
+        });
+    });
+
     it(`should fail to auth on call to processActivity().`, function (done) {
         const req = new MockRequest(incomingMessage);
         const res = new MockResponse();