CaptchaBundle/Validator/CaptchaValidator.php

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<?php
namespace Gregwar\CaptchaBundle\Validator;
use Symfony\Component\Form\FormValidatorInterface;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormError;
/**
* Captcha validator
*
* @author Gregwar <g.passault@gmail.com>
*/
class CaptchaValidator implements FormValidatorInterface
{
/**
* Session
*/
private $session;
/**
* Session key to store the code
*/
private $key;
/**
* Error message text for non-matching submissions
*/
private $invalidMessage;
/**
* Configuration parameter used to bypass a required code match
*/
private $bypassCode;
public function __construct(Session $session, $key, $invalidMessage, $bypassCode)
{
$this->session = $session;
$this->key = $key;
$this->invalidMessage = $invalidMessage;
$this->bypassCode = $bypassCode;
}
public function validate(FormInterface $form)
{
$code = $form->getData();
$expectedCode = $this->getExpectedCode();
if (!($code && is_string($code)
&& ($this->compare($code, $expectedCode) || $this->compare($code, $this->bypassCode)))) {
$form->addError(new FormError($this->invalidMessage));
}
$this->session->remove($this->key);
if ($this->session->has($this->key.'_fingerprint')) {
$this->session->remove($this->key.'_fingerprint');
}
}
/**
* Retrieve the expected CAPTCHA code
*/
private function getExpectedCode()
{
if ($this->session->has($this->key)) {
return $this->session->get($this->key);
}
return null;
}
/**
* Process the codes
*/
private function niceize($code)
{
return strtr(strtolower($code), 'oil', '01l');
}
/**
* Run a match comparison on the provided code and the expected code
*/
private function compare($code, $expectedCode)
{
return ($expectedCode && is_string($expectedCode) && $this->niceize($code) == $this->niceize($expectedCode));
}
}