149 lines
3.8 KiB
PHP
149 lines
3.8 KiB
PHP
<?php
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namespace Gregwar\CaptchaBundle\Generator;
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use Symfony\Component\Finder\Finder;
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use Symfony\Component\HttpFoundation\Session\SessionInterface;
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use Symfony\Component\Routing\RouterInterface;
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/**
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* Uses configuration parameters to call the services that generate captcha images
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*
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* @author Gregwar <g.passault@gmail.com>
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* @author Jeremy Livingston <jeremy.j.livingston@gmail.com>
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*/
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class CaptchaGenerator
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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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protected $session;
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/**
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* @var \Symfony\Component\Routing\RouterInterface
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*/
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protected $router;
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/**
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* @var ImageBuilder
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*/
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protected $builder;
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/**
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* @var ImageFileHandler
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*/
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protected $imageFileHandler;
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/**
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* @param \Symfony\Component\HttpFoundation\Session\SessionInterface $session
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* @param \Symfony\Component\Routing\RouterInterface $router
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* @param ImageBuilder $builder
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* @param ImageFileHandler $imageFileHandler
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*/
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public function __construct(SessionInterface $session, RouterInterface $router, ImageBuilder $builder, ImageFileHandler $imageFileHandler)
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{
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$this->session = $session;
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$this->router = $router;
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$this->builder = $builder;
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$this->imageFileHandler = $imageFileHandler;
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}
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/**
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* Get the captcha URL, stream, or filename that will go in the image's src attribute
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*
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* @param $key
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* @param array $options
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*
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* @return array
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*/
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public function getCaptchaCode($key, array $options)
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{
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// Randomly execute garbage collection and returns the image filename
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if ($options['as_file']) {
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$this->imageFileHandler->collectGarbage();
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return $this->generate($key, $options);
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}
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// Returns the image generation URL
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if ($options['as_url']) {
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return $this->router->generate('gregwar_captcha.generate_captcha', array('key' => $key));
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}
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return 'data:image/jpeg;base64,' . base64_encode($this->generate($key, $options));
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}
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/**
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* @param string $key
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* @param array $options
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*
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* @return string
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*/
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public function generate($key, array $options)
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{
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$fingerprint = $this->getFingerprint($key, $options);
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$content = $this->builder->build(
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$options['width'],
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$options['height'],
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$options['font'],
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$this->getPhrase($key, $options),
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$fingerprint
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);
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if ($options['keep_value']) {
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$this->session->set($key . '_fingerprint', $this->builder->getFingerprint());
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}
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if (!$options['as_file']) {
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ob_start();
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imagejpeg($content, null, $options['quality']);
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return ob_get_clean();
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}
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return $this->imageFileHandler->saveAsFile($content);
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}
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/**
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* @param string $key
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* @param array $options
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*
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* @return string
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*/
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protected function getPhrase($key, array $options)
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{
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// Get the phrase that we'll use for this image
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if ($options['keep_value'] && $this->session->has($key)) {
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return $this->session->get($key);
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}
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$phrase = '';
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$chars = str_split($options['charset']);
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for ($i = 0; $i < $options['length']; $i++) {
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$phrase .= $chars[array_rand($chars)];
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}
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$this->session->set($key, $phrase);
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return $phrase;
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}
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/**
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* @param string $key
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* @param array $options
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*
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* @return array|null
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*/
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protected function getFingerprint($key, array $options)
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{
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if ($options['keep_value'] && $this->session->has($key . '_fingerprint')) {
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return $this->session->get($key . '_fingerprint');
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}
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return null;
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}
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}
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