320 lines
9.0 KiB
PHP
320 lines
9.0 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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* Generates a CAPTCHA image
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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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* Name of folder for captcha images
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* @var string
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*/
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protected $imageFolder;
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/**
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* Absolute path to public web folder
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* @var string
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*/
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protected $webPath;
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/**
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* Frequency of garbage collection in fractions of 1
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* @var int
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*/
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protected $gcFreq;
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/**
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* Maximum age of images in minutes
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* @var int
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*/
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protected $expiration;
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/**
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* The fingerprint used to generate the image details across requests
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* @var array|null
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*/
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protected $fingerprint;
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/**
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* Whether this instance should use the fingerprint
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* @var bool
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*/
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protected $useFingerprint;
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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 string $imageFolder
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* @param string $webPath
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* @param int $gcFreq
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* @param int $expiration
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*/
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public function __construct(SessionInterface $session, RouterInterface $router, $imageFolder, $webPath, $gcFreq, $expiration)
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{
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$this->session = $session;
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$this->router = $router;
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$this->imageFolder = $imageFolder;
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$this->webPath = $webPath;
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$this->gcFreq = $gcFreq;
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$this->expiration = $expiration;
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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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if (mt_rand(1, $this->gcFreq) == 1) {
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$this->garbageCollection();
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}
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return $this->generate($key, $options);
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}
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// Returns the configured URL for image generation
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if ($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, $options));
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}
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/**
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* Generate the image
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*/
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public function generate($key, array $options)
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{
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$width = $options['width'];
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$height = $options['height'];
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if ($options['keep_value'] && $this->session->has($key . '_fingerprint')) {
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$this->fingerprint = $this->session->get($key . '_fingerprint');
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$this->useFingerprint = true;
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} else {
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$this->fingerprint = null;
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$this->useFingerprint = false;
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}
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$captchaValue = $this->getCaptchaValue($key, $options['keep_value'], $options['charset'], $options['length']);
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$i = imagecreatetruecolor($width,$height);
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$col = imagecolorallocate($i, $this->rand(0,110), $this->rand(0,110), $this->rand(0,110));
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imagefill($i, 0, 0, 0xFFFFFF);
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// Draw random lines
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for ($t=0; $t<10; $t++) {
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$tcol = imagecolorallocate($i, 100+$this->rand(0,150), 100+$this->rand(0,150), 100+$this->rand(0,150));
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$Xa = $this->rand(0, $width);
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$Ya = $this->rand(0, $height);
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$Xb = $this->rand(0, $width);
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$Yb = $this->rand(0, $height);
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imageline($i, $Xa, $Ya, $Xb, $Yb, $tcol);
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}
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// Write CAPTCHA text
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$size = $width / strlen($captchaValue);
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$font = $options['font'];
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$box = imagettfbbox($size, 0, $font, $captchaValue);
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$textWidth = $box[2] - $box[0];
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$textHeight = $box[1] - $box[7];
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imagettftext($i, $size, 0, ($width - $textWidth) / 2, ($height - $textHeight) / 2 + $size, $col, $font, $captchaValue);
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// Distort the image
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$X = $this->rand(0, $width);
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$Y = $this->rand(0, $height);
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$phase = $this->rand(0, 10);
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$scale = 1.3 + $this->rand(0, 10000) / 30000;
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$out = imagecreatetruecolor($width, $height);
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for ($x = 0; $x < $width; $x++) {
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for ($y = 0; $y < $height; $y++) {
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$Vx = $x - $X;
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$Vy = $y - $Y;
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$Vn = sqrt($Vx * $Vx + $Vy * $Vy);
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if ($Vn != 0) {
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$Vn2 = $Vn + 4 * sin($Vn / 8);
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$nX = $X + ($Vx * $Vn2 / $Vn);
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$nY = $Y + ($Vy * $Vn2 / $Vn);
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} else {
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$nX = $X;
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$nY = $Y;
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}
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$nY = $nY + $scale * sin($phase + $nX * 0.2);
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$p = $this->bilinearInterpolate($nX - floor($nX), $nY - floor($nY),
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$this->getCol($i, floor($nX), floor($nY)),
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$this->getCol($i, ceil($nX), floor($nY)),
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$this->getCol($i, floor($nX), ceil($nY)),
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$this->getCol($i, ceil($nX), ceil($nY)));
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if ($p == 0) {
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$p = 0xFFFFFF;
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}
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imagesetpixel($out, $x, $y, $p);
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}
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}
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if ($options['keep_value']) {
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$this->session->set($key . '_fingerprint', $this->fingerprint);
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}
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// Renders it
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if (!$options['as_file']) {
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ob_start();
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imagejpeg($out, null, $options['quality']);
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return ob_get_clean();
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}
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// Check if folder exists and create it if not
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if (!file_exists($this->webPath . '/' . $this->imageFolder)) {
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mkdir($this->webPath . '/' . $this->imageFolder, 0755);
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}
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$filename = md5(uniqid()) . '.jpg';
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$filepath = $this->webPath . '/' . $this->imageFolder . '/' . $filename;
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imagejpeg($out, $filepath, 15);
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return '/' . $this->imageFolder . '/' . $filename;
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}
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/**
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* Generate a new captcha value or pull the existing one from the session
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*
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* @param string $key
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* @param bool $keepValue
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* @param string $charset
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* @param int $length
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*
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* @return mixed|string
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*/
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protected function getCaptchaValue($key, $keepValue, $charset, $length)
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{
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if ($keepValue && $this->session->has($key)) {
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return $this->session->get($key);
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}
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$value = '';
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$chars = str_split($charset);
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for ($i=0; $i < $length; $i++) {
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$value .= $chars[array_rand($chars)];
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}
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$this->session->set($key, $value);
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return $value;
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}
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/**
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* Deletes all images in the configured folder
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* that are older than the configured number of minutes
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*
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* @return void
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*/
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protected function garbageCollection()
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{
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$finder = new Finder();
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$criteria = sprintf('<= now - %s minutes', $this->expiration);
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$finder->in($this->webPath . '/' . $this->imageFolder)
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->date($criteria);
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foreach($finder->files() as $file) {
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unlink($file->getPathname());
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}
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}
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/**
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* Returns a random number or the next number in the
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* fingerprint
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*/
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protected function rand($min, $max)
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{
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if (!is_array($this->fingerprint)) {
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$this->fingerprint = array();
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}
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if ($this->useFingerprint) {
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$value = current($this->fingerprint);
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next($this->fingerprint);
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} else {
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$value = mt_rand($min, $max);
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$this->fingerprint[] = $value;
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}
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return $value;
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}
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protected function bilinearInterpolate($x, $y, $nw, $ne, $sw, $se)
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{
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list($r0, $g0, $b0) = $this->getRGB($nw);
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list($r1, $g1, $b1) = $this->getRGB($ne);
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list($r2, $g2, $b2) = $this->getRGB($sw);
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list($r3, $g3, $b3) = $this->getRGB($se);
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$cx = 1.0 - $x;
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$cy = 1.0 - $y;
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$m0 = $cx * $r0 + $x * $r1;
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$m1 = $cx * $r2 + $x * $r3;
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$r = (int)($cy * $m0 + $y * $m1);
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$m0 = $cx * $g0 + $x * $g1;
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$m1 = $cx * $g2 + $x * $g3;
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$g = (int)($cy * $m0 + $y * $m1);
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$m0 = $cx * $b0 + $x * $b1;
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$m1 = $cx * $b2 + $x * $b3;
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$b = (int)($cy * $m0 + $y * $m1);
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return ($r << 16) | ($g << 8) | $b;
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}
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protected function getCol($image, $x, $y)
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{
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$L = imagesx($image);
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$H = imagesy($image);
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if ($x < 0 || $x >= $L || $y < 0 || $y >= $H) {
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return 0xFFFFFF;
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}
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return imagecolorat($image, $x, $y);
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}
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protected function getRGB($col) {
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return array(
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(int)($col >> 16) & 0xff,
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(int)($col >> 8) & 0xff,
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(int)($col) & 0xff,
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);
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}
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}
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