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