continuation of PR #8074 Adding spam prevention - fixes #8060 (#8687)

* Adding code to look over the most recent messages to look for spam from a user

* Adding in translatable error message

* Adding 2 tests for spam detection

* Fixing changes requested for pull request

* Adding unit tests for group and fixing requested changes

* Fixing message and tests

* Forgot to remove this import

* Fixing lint errors

* Cleaning up the code and tests to be more readable

* Fixing lint errors

* Fixed linting issues

* Syntax fixes

* Updated grammar

website/server/controllers/api-v3/chat.js

@@ -153,6 +153,10 @@ api.postChat = {
     let lastClientMsg = req.query.previousMsg;
     chatUpdated = lastClientMsg && group.chat && group.chat[0] && group.chat[0].id !== lastClientMsg ? true : false;
 
+    if (group.checkChatSpam(user)) {
+      throw new NotAuthorized(res.t('messageGroupChatSpam'));
+    }
+
     let newChatMessage = group.sendChat(req.body.message, user);
 
     let toSave = [group.save()];