Step 7.29: Added restriction on new message method

Author: dotansimha

api/server/methods.ts

@@ -22,6 +22,9 @@ Meteor.methods({
     });
   },
   addMessage(type: MessageType, chatId: string, content: string) {
+    if (!this.userId) throw new Meteor.Error('unauthorized',
+      'User must be logged-in to create a new chat');
+
     check(type, Match.OneOf(String, [ MessageType.TEXT ]));
     check(chatId, nonEmptyString);
     check(content, nonEmptyString);
@@ -36,6 +39,7 @@ Meteor.methods({
     return {
       messageId: Messages.collection.insert({
         chatId: chatId,
+        senderId: this.userId,
         content: content,
         createdAt: new Date(),
         type: type