protected function activateUser($uuid, $activationToken)
    {
        // Check the uuid
        if (!$this->userManager->hasUserForUuid($uuid)) {
            return array('result' => false, 'message' => $this->translate('Account with the given UUID does not exist.', '\\Zepi\\Web\\AccessControl'));
        }
        
        // Compare the activation token
        $user = $this->userManager->getUserForUuid($uuid);
        if ($user->getMetaData('activationToken') !== $activationToken) {
            return array('result' => false, 'message' => $this->translate('The given activation token is not valid.', '\\Zepi\\Web\\AccessControl'));
        }
        
        // Remove the disabled access level
        $this->accessControlManager->revokePermission($uuid, get_class($user), '\\Global\\Disabled');
        $this->accessControlManager->grantPermission($uuid, get_class($user), '\\Global\\Active', 'Activation');
        
        return array('result' => true, 'message' => $this->translate('Your account was activated successfully.', '\\Zepi\\Web\\AccessControl'));
    }