mirror of
https://github.com/wallabag/wallabag.git
synced 2024-06-03 05:49:22 +00:00
148 lines
4.7 KiB
PHP
148 lines
4.7 KiB
PHP
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<?php
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namespace Wallabag\CoreBundle\Helper;
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use Psr\Log\LoggerInterface as Logger;
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use Symfony\Component\DomCrawler\Crawler;
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define('REGENERATE_PICTURES_QUALITY', 75);
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class DownloadImages {
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private $folder;
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private $url;
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private $html;
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private $fileName;
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private $logger;
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public function __construct($html, $url, Logger $logger) {
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$this->html = $html;
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$this->url = $url;
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$this->setFolder();
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$this->logger = $logger;
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}
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public function setFolder($folder = "assets/images") {
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// if folder doesn't exist, attempt to create one and store the folder name in property $folder
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if(!file_exists($folder)) {
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mkdir($folder);
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}
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$this->folder = $folder;
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}
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public function process() {
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//instantiate the symfony DomCrawler Component
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$crawler = new Crawler($this->html);
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// create an array of all scrapped image links
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$this->logger->log('debug', 'Finding images inside document');
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$result = $crawler
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->filterXpath('//img')
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->extract(array('src'));
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// download and save the image to the folder
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foreach ($result as $image) {
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$file = file_get_contents($image);
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// Checks
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$absolute_path = self::getAbsoluteLink($image, $this->url);
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$filename = basename(parse_url($absolute_path, PHP_URL_PATH));
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$fullpath = $this->folder."/".$filename;
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self::checks($file, $fullpath, $absolute_path);
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$this->html = str_replace($image, $fullpath, $this->html);
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}
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return $this->html;
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}
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private function checks($rawdata, $fullpath, $absolute_path) {
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$fullpath = urldecode($fullpath);
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if (file_exists($fullpath)) {
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unlink($fullpath);
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}
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// check extension
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$this->logger->log('debug','Checking extension');
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$file_ext = strrchr($fullpath, '.');
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$whitelist = array('.jpg', '.jpeg', '.gif', '.png');
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if (!(in_array($file_ext, $whitelist))) {
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$this->logger->log('debug','processed image with not allowed extension. Skipping '.$fullpath);
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return false;
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}
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// check headers
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$this->logger->log('debug','Checking headers');
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$imageinfo = getimagesize($absolute_path);
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if ($imageinfo['mime'] != 'image/gif' && $imageinfo['mime'] != 'image/jpeg' && $imageinfo['mime'] != 'image/jpg' && $imageinfo['mime'] != 'image/png') {
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$this->logger->log('debug','processed image with bad header. Skipping '.$fullpath);
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return false;
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}
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// regenerate image
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$this->logger->log('debug','regenerating image');
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$im = imagecreatefromstring($rawdata);
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if ($im === false) {
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$this->logger->log('error','error while regenerating image '.$fullpath);
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return false;
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}
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switch ($imageinfo['mime']) {
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case 'image/gif':
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$result = imagegif($im, $fullpath);
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$this->logger->log('debug','Re-creating gif');
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break;
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case 'image/jpeg':
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case 'image/jpg':
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$result = imagejpeg($im, $fullpath, REGENERATE_PICTURES_QUALITY);
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$this->logger->log('debug','Re-creating jpg');
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break;
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case 'image/png':
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$this->logger->log('debug','Re-creating png');
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$result = imagepng($im, $fullpath, ceil(REGENERATE_PICTURES_QUALITY / 100 * 9));
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break;
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}
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imagedestroy($im);
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return $result;
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}
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private static function getAbsoluteLink($relativeLink, $url)
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{
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/* return if already absolute URL */
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if (parse_url($relativeLink, PHP_URL_SCHEME) != '') {
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return $relativeLink;
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}
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/* queries and anchors */
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if ($relativeLink[0] == '#' || $relativeLink[0] == '?') {
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return $url.$relativeLink;
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}
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/* parse base URL and convert to local variables:
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$scheme, $host, $path */
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extract(parse_url($url));
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/* remove non-directory element from path */
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$path = preg_replace('#/[^/]*$#', '', $path);
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/* destroy path if relative url points to root */
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if ($relativeLink[0] == '/') {
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$path = '';
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}
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/* dirty absolute URL */
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$abs = $host.$path.'/'.$relativeLink;
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/* replace '//' or '/./' or '/foo/../' with '/' */
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$re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
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for ($n = 1; $n > 0; $abs = preg_replace($re, '/', $abs, -1, $n)) {
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}
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/* absolute URL is ready! */
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return $scheme.'://'.$abs;
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}
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}
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