closes #3595

public/language/en_GB/error.json

@@ -100,6 +100,8 @@
 	"cant-chat-with-yourself": "You can't chat with yourself!",
 	"chat-restricted": "This user has restricted their chat messages. They must follow you before you can chat with them",
 	"too-many-messages": "You have sent too many messages, please wait awhile.",
+	"invalid-chat-message": "Invalid chat message",
+	"chat-message-too-long": "Chat message is too long",
 
 	"reputation-system-disabled": "Reputation system is disabled.",
 	"downvoting-disabled": "Downvoting is disabled",

src/messaging.js

@@ -28,8 +28,6 @@ var db = require('./database'),
 	}
 
 	Messaging.addMessage = function(fromuid, touid, content, timestamp, callback) {
-		var uids = sortUids(fromuid, touid);
-
 		if (typeof timestamp === 'function') {
 			callback = timestamp;
 			timestamp = Date.now();
@@ -37,6 +35,16 @@ var db = require('./database'),
 			timestamp = timestamp || Date.now();
 		}
 
+		if (!content) {
+			return callback(new Error('[[error:invalid-chat-message]]'));
+		}
+
+		if (content.length > (meta.config.maximumChatMessageLength || 1000)) {
+			return callback(new Error('[[error:chat-message-too-long]]'));
+		}
+
+		var uids = sortUids(fromuid, touid);
+
 		db.incrObjectField('global', 'nextMid', function(err, mid) {
 			if (err) {
 				return callback(err);

src/views/admin/partials/menu.tpl

@@ -182,6 +182,7 @@
 					<li><a href="{relative_path}/admin/settings/group">Group</a></li>
 					<li><a href="{relative_path}/admin/settings/guest">Guests</a></li>
 					<li><a href="{relative_path}/admin/settings/post">Post</a></li>
+					<li><a href="{relative_path}/admin/settings/chat">Chat</a></li>
 					<li><a href="{relative_path}/admin/settings/pagination">Pagination</a></li>
 					<li><a href="{relative_path}/admin/settings/tags">Tags</a></li>
 					<li><a href="{relative_path}/admin/settings/notifications">Notifications</a></li>

src/views/admin/settings/chat.tpl

@@ -10,7 +10,7 @@
 
 		<div class="form-group">
 			<label>Maximum length of chat messages</label>
-			<input type="text" class="form-control" value="1000" data-field="maximumChatLength">
+			<input type="text" class="form-control" value="1000" data-field="maximumChatMessageLength">
 		</div>
 	</div>
 </div>

src/views/admin/settings/post.tpl

@@ -114,15 +114,6 @@
 	</div>
 </div>
 
-<div class="row">
-	<div class="col-sm-2 col-xs-12 settings-header">Chat Settings</div>
-	<div class="col-sm-10 col-xs-12">
-		<form>
-			<strong>Chat Message Inbox Size</strong><br /> <input type="text" class="form-control" value="250" data-field="chatMessageInboxSize">
-		</form>
-	</div>
-</div>
-
 <div class="row">
 	<div class="col-sm-2 col-xs-12 settings-header">Upload Settings</div>
 	<div class="col-sm-10 col-xs-12">