moved a number of sanity checks to also be in canMessage, so they are all consolidated into one exported method. (@barisusakli)

src/messaging.js

@@ -298,7 +298,32 @@ var db = require('./database'),
 	};
 
 	Messaging.canMessage = function(fromUid, toUid, callback) {
+		if (parseInt(meta.config.disableChat) === 1) {
+			return callback(new Error('[[error:chat-disabled]]'));
+		} else if (toUid === fromUid) {
+			return callback(new Error('[[error:cant-chat-with-yourself]]'));
+		} else if (fromUid === 0) {
+			return callback(new Error('[[error:not-logged-in]]'));
+		}
+
 		async.waterfall([
+			function(next) {
+				user.getUserFields(fromUid, ['banned', 'email:confirmed'], function(err, userData) {
+					if (err) {
+						return callback(err);
+					}
+
+					if (parseInt(userData.banned, 10) === 1) {
+						return callback(new Error('[[error:user-banned]]'));
+					}
+
+					if (parseInt(meta.config.requireEmailConfirmation, 10) === 1 && parseInt(userData['email:confirmed'], 10) !== 1) {
+						return callback(new Error('[[error:email-not-confirmed-chat]]'));
+					}
+
+					next();
+				});
+			},
 			function(next) {
 				user.getSettings(toUid, next);
 			},

src/socket.io/modules.js

@@ -139,35 +139,15 @@ SocketModules.chats.send = function(socket, data, callback) {
 		return callback(new Error('[[error:invalid-data]]'));
 	}
 
-	if (parseInt(meta.config.disableChat) === 1) {
-		return callback(new Error('[[error:chat-disabled]]'));
-	}
-
-	var touid = parseInt(data.touid, 10);
-	if (touid === socket.uid || socket.uid === 0) {
-		return;
-	}
+	var now = Date.now(),
+		touid = parseInt(data.touid, 10);
 
-	var now = Date.now();
+	// Websocket rate limiting
 	socket.lastChatMessageTime = socket.lastChatMessageTime || 0;
-
 	if (now - socket.lastChatMessageTime < 200) {
 		return callback(new Error('[[error:too-many-messages]]'));
-	}
-
+	} else {
 		socket.lastChatMessageTime = now;
-
-	user.getUserFields(socket.uid, ['banned', 'email:confirmed'], function(err, userData) {
-		if (err) {
-			return callback(err);
-		}
-
-		if (parseInt(userData.banned, 10) === 1) {
-			return callback(new Error('[[error:user-banned]]'));
-		}
-
-		if (parseInt(meta.config.requireEmailConfirmation, 10) === 1 && parseInt(userData['email:confirmed'], 10) !== 1) {
-			return callback(new Error('[[error:email-not-confirmed-chat]]'));
 	}
 
 	Messaging.canMessage(socket.uid, touid, function(err, allowed) {
@@ -201,7 +181,6 @@ SocketModules.chats.send = function(socket, data, callback) {
 			callback();
 		});
 	});
-	});
 };
 
 SocketModules.chats.canMessage = function(socket, toUid, callback) {