Add userId parameter to signOutUser

libraries/botbuilder/src/botFrameworkAdapter.ts

@@ -402,13 +402,18 @@ export class BotFrameworkAdapter extends BotAdapter implements IUserTokenProvide
      * Signs the user out with the token server.
      * @param context Context for the current turn of conversation with the user.
      * @param connectionName Name of the auth connection to use.
+     * @param userId id of user to sign out.
+     * @returns A promise that represents the work queued to execute.
      */
-    public async signOutUser(context: TurnContext, connectionName: string): Promise<void> {
+    public async signOutUser(context: TurnContext, connectionName?: string, userId?: string): Promise<void> {
         if (!context.activity.from || !context.activity.from.id) {
             throw new Error(`BotFrameworkAdapter.signOutUser(): missing from or from.id`);
         }
+        if (!userId){
+            userId = context.activity.from.id;
+        }
+
         this.checkEmulatingOAuthCards(context);
-        const userId: string = context.activity.from.id;
         const url: string = this.oauthApiUrl(context);
         const client: TokenApiClient = this.createTokenApiClient(url);
         await client.userToken.signOut(userId, { connectionName: connectionName, channelId: context.activity.channelId } );