Contao\CoreBundle\Security\User\ContaoUserProvider::isFrontendUsername PHP Method

Checks if the given username can be mapped to a front end user.

private isFrontendUsername ( string $username ) : boolean
$username	string
return	boolean

    private function isFrontendUsername($username)
    {
        return 'frontend' === $username && $this->isFrontendScope();
    }

ContaoUserProvider