Provide feedback when user creation fails

lib/user.php

@@ -117,15 +117,15 @@ class OC_User {
 		// Check the name for bad characters
 		// Allowed are: "a-z", "A-Z", "0-9" and "_.@-"
 		if( preg_match( '/[^a-zA-Z0-9 _\.@\-]/', $uid )){
-			return false;
+			throw new Exception('Only the following characters are allowed in a username: "a-z", "A-Z", "0-9", and "_.@-"');
 		}
 		// No empty username
 		if(trim($uid) == ''){
-			return false;
+			throw new Exception('A valid username must be provided');
 		}
 		// Check if user already exists
 		if( self::userExists($uid) ){
-			return false;
+			throw new Exception('The username is already being used');
 		}
 
 

settings/ajax/createuser.php

@@ -23,7 +23,8 @@ if( in_array( $username, OC_User::getUsers())){
 }
 
 // Return Success story
-if( OC_User::createUser( $username, $password )){
+try {
+	OC_User::createUser($username, $password);
 	foreach( $groups as $i ){
 		if(!OC_Group::groupExists($i)){
 			OC_Group::createGroup($i);
@@ -31,9 +32,8 @@ if( OC_User::createUser( $username, $password )){
 		OC_Group::addToGroup( $username, $i );
 	}
 	OC_JSON::success(array("data" => array( "username" => $username, "groups" => implode( ", ", OC_Group::getUserGroups( $username )))));
-}
-else{
-	OC_JSON::error(array("data" => array( "message" => "Unable to add user" )));
+} catch (Exception $exception) {
+	OC_JSON::error(array("data" => array( "message" => $exception->getMessage())));
 }
 
 ?>

settings/js/users.js

@@ -158,10 +158,11 @@ $(document).ready(function(){
 		event.preventDefault();
 		var username=$('#newusername').val();
 		if($('#content table tbody tr').filterAttr('data-uid',username).length>0){
+			OC.dialogs.alert('The username is already being used', 'Error creating user');
 			return;
 		}
 		if($.trim(username) == '') {
-			alert('Please provide a username!');
+			OC.dialogs.alert('A valid username must be provided', 'Error creating user');
 			return false;
 		}
 		var password=$('#newuserpassword').val();
@@ -177,6 +178,7 @@ $(document).ready(function(){
 			function(result){
 				if(result.status!='success'){
 					tr.remove();
+					OC.dialogs.alert(result.data.message, 'Error creating user');
 				}
 			}
 		);