removed client-side chat message length check in favour of server-side check, firing new hook on messaging.checkContent for hooks to intercept

public/src/client/chats/messages.js

@@ -8,10 +8,6 @@ define('forum/chats/messages', ['components', 'sounds', 'translator', 'benchpres
 		var msg = inputEl.val();
 		var mid = inputEl.attr('data-mid');
 
-		if (msg.length > ajaxify.data.maximumChatMessageLength) {
-			return app.alertError('[[error:chat-message-too-long,' + ajaxify.data.maximumChatMessageLength + ']]');
-		}
-
 		if (!msg.length) {
 			return;
 		}

src/messaging/create.js

@@ -30,13 +30,20 @@ module.exports = function (Messaging) {
 		if (!content) {
 			return callback(new Error('[[error:invalid-chat-message]]'));
 		}
-		content = String(content);
+
+		plugins.fireHook('filter:messaging.checkContent', { content: content }, function (err, data) {
+			if (err) {
+				return callback(err);
+			}
+
+			content = String(data.content);
 
 			var maximumChatMessageLength = (meta.config.maximumChatMessageLength || 1000);
 			if (content.length > maximumChatMessageLength) {
 				return callback(new Error('[[error:chat-message-too-long, ' + maximumChatMessageLength + ']]'));
 			}
 			callback();
+		});
 	};
 
 	Messaging.addMessage = function (data, callback) {