159 lines
3.9 KiB
PHP
159 lines
3.9 KiB
PHP
<?php
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declare(strict_types=1);
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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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use Symfony\Contracts\Translation\TranslatorInterface;
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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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/** @var SessionInterface */
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private $session;
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/**
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* Session key to store the code
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* @var string
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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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* @var string
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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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* @var string
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*/
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private $bypassCode;
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/**
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* Number of form that the user can submit without captcha
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* @var int
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*/
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private $humanity;
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/**
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* Translator
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* @var TranslatorInterface
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*/
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private $translator;
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/**
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* @param TranslatorInterface $translator
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* @param SessionInterface $session
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* @param string $key
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* @param string $invalidMessage
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* @param string $bypassCode
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* @param int $humanity
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*/
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public function __construct(
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TranslatorInterface $translator,
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SessionInterface $session,
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string $key,
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string $invalidMessage,
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string $bypassCode,
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int $humanity
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) {
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$this->translator = $translator;
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$this->session = $session;
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$this->key = $key;
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$this->invalidMessage = $invalidMessage;
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$this->bypassCode = $bypassCode;
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$this->humanity = $humanity;
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}
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public function validate(FormEvent $event): void
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{
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$form = $event->getForm();
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$code = $form->getData();
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$expectedCode = $this->getExpectedCode();
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if ($this->humanity > 0) {
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$humanity = $this->getHumanity();
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if ($humanity > 0) {
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$this->updateHumanity($humanity-1);
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return;
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}
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}
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if (!($code !== null && is_string($code) && ($this->compare($code, $expectedCode) || $this->compare($code, $this->bypassCode)))) {
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$form->addError(new FormError($this->translator->trans($this->invalidMessage, array(), 'validators')));
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} else {
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if ($this->humanity > 0) {
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$this->updateHumanity($this->humanity);
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}
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}
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$this->session->remove($this->key);
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if ($this->session->has($this->key . '_fingerprint')) {
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$this->session->remove($this->key . '_fingerprint');
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}
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}
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/**
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* Retrieve the expected CAPTCHA code
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*
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* @return mixed|null
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*/
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protected function getExpectedCode()
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{
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$options = $this->session->get($this->key, array());
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if (is_array($options) && isset($options['phrase'])) {
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return $options['phrase'];
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}
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return null;
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}
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/**
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* Retrieve the humanity
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*
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* @return mixed|null
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*/
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protected function getHumanity()
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{
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return $this->session->get($this->key . '_humanity', 0);
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}
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protected function updateHumanity(int $newValue): void
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{
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if ($newValue > 0) {
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$this->session->set($this->key . '_humanity', $newValue);
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} else {
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$this->session->remove($this->key . '_humanity');
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}
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}
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protected function niceize(string $code): string
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{
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return strtr(strtolower($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, $expectedCode): bool
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{
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return ($expectedCode !== null && is_string($expectedCode) && $this->niceize($code) == $this->niceize($expectedCode));
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}
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}
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