Validation on username?

Question

Just wondering if theres anyway to force some validation on the username? I have usernames being displayed locally, and therefore I'm trying to prevent email addresses being used. I have my client side validation set up with regex to prevent an email being used, but some users still seem to have been able to register with the email as there username (presumably they have JS disabled).

It would be nice to enforce that validation server side.

Answer 1

I don't know if there is anything natively in Craft to do this, but you could achieve it quite easily with a single file plugin:

public function init()
{
    craft()->on('users.onBeforeSaveUser', function(Event $event) {
        // Only do anything if it is a front end submission
        if(craft()->request->isSiteRequest())
        {
            $username = craft()->request->getPost('username', null);
            if($this->isEmail($username))
            {
                $event->params['user']->addErrors(array('username' => Craft::t('You cannot use an email')));
                $event->performAction = false;
            }
        }
    });
}

Answer 2

I ran into username validation because I had to migrate user names containing spaces (not allowed by default).

I ended up creating a custom Username validator and let composer's autoloader use that one instead of craft's default. You can easily add your own validation rules there.

class UsernameValidator extends Validator
{
  public function validateValue($value)
  {
    // your own validation rules here

    // (disabled) Don't allow whitespace in the username
    // if (preg_match('/\s+/', $value)) {
    //    return ['{attribute} cannot contain spaces.', []];
    // }

    return null;
  }
}

Here is how to use the custom validator instead of the default one. Note that if Craft changes it's internals this might have to be adjusted.

https://io.24hoursmedia.com/tech-notes/allow-spaces-in-craft-cms-user-names