Hi,

I wouldn't even use a post validator in this case, but rather a pre
validator with a callback validator:

Example:

class MyForm ...
{
  public function configure()
  {
    ...
    $this->setPreValidator(new sfValidatorCallback(array(
      'callback' => array($this, 'preValidate')
    )));
  }

  public function preValidate(sfValidatorCallback $validator, array $values)
  {
    if ($values['validateme'] == 'OF_COURSE_NOT!')
    {
      $this->validatorSchema['evil_xss_field'] = new sfValidatorPass();
      ..
    }
  }
}

etc.


Bernhard

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