forked from wallabag/wallabag
Use doctrine event to download images
This commit is contained in:
Jeremy Benoist
@ -2,193 +2,197 @@
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namespace Wallabag\CoreBundle\Helper;
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use Psr\Log\LoggerInterface as Logger;
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use Psr\Log\LoggerInterface;
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use Symfony\Component\DomCrawler\Crawler;
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define('REGENERATE_PICTURES_QUALITY', 75);
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define('HTTP_PORT', 80);
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define('SSL_PORT', 443);
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define('BASE_URL', '');
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use GuzzleHttp\Client;
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use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeExtensionGuesser;
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class DownloadImages
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{
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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 $logger;
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const REGENERATE_PICTURES_QUALITY = 80;
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public function __construct($html, $url, Logger $logger)
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private $client;
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private $baseFolder;
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private $logger;
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private $mimeGuesser;
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public function __construct(Client $client, $baseFolder, LoggerInterface $logger)
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{
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$this->html = $html;
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$this->url = $url;
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$this->setFolder();
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$this->client = $client;
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$this->baseFolder = $baseFolder;
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$this->logger = $logger;
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$this->mimeGuesser = new MimeTypeExtensionGuesser();
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$this->setFolder();
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}
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public function setFolder($folder = 'assets/images')
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/**
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* Setup base folder where all images are going to be saved.
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*/
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private function setFolder()
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{
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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($folder);
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if (!file_exists($this->baseFolder)) {
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mkdir($this->baseFolder, 0777, true);
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}
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$this->folder = $folder;
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}
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public function process()
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/**
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* Process the html and extract image from it, save them to local and return the updated html.
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*
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* @param string $html
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* @param string $url Used as a base path for relative image and folder
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*
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* @return string
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*/
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public function processHtml($html, $url)
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{
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//instantiate the symfony DomCrawler Component
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$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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$crawler = new Crawler($html);
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$result = $crawler
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->filterXpath('//img')
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->extract(array('src'));
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$relativePath = $this->getRelativePath($url);
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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($image);
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$imagePath = $this->processSingleImage($image, $url, $relativePath);
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// Checks
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$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($image, self::getPocheUrl().'/'.$fullpath, $this->html);
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if (false === $imagePath) {
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continue;
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}
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$html = str_replace($image, $imagePath, $html);
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}
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return $this->html;
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return $html;
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}
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private function checks($rawdata, $fullpath, $absolute_path)
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/**
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* Process a single image:
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* - retrieve it
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* - re-saved it (for security reason)
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* - return the new local path.
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*
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* @param string $imagePath Path to the image to retrieve
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* @param string $url Url from where the image were found
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* @param string $relativePath Relative local path to saved the image
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*
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* @return string Relative url to access the image from the web
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*/
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public function processSingleImage($imagePath, $url, $relativePath = null)
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{
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$fullpath = urldecode($fullpath);
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if (file_exists($fullpath)) {
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unlink($fullpath);
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if (null == $relativePath) {
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$relativePath = $this->getRelativePath($url);
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}
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// check extension
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$this->logger->log('debug', 'Checking extension');
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$folderPath = $this->baseFolder.'/'.$relativePath;
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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 '.$fullpath);
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// build image path
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$absolutePath = $this->getAbsoluteLink($url, $imagePath);
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if (false === $absolutePath) {
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$this->logger->log('debug', 'Can not determine the absolute path for that image, skipping.');
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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 '.$fullpath);
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$res = $this->client->get(
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$absolutePath,
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['exceptions' => false]
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);
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$ext = $this->mimeGuesser->guess($res->getHeader('content-type'));
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$this->logger->log('debug', 'Checking extension', ['ext' => $ext, 'header' => $res->getHeader('content-type')]);
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if (!in_array($ext, ['jpeg', 'jpg', 'gif', 'png'])) {
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$this->logger->log('debug', 'Processed image with not allowed extension. Skipping '.$imagePath);
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return false;
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}
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$hashImage = hash('crc32', $absolutePath);
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$localPath = $folderPath.'/'.$hashImage.'.'.$ext;
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try {
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$im = imagecreatefromstring($res->getBody());
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} catch (\Exception $e) {
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$im = 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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$this->logger->log('error', 'Error while regenerating image', ['path' => $localPath]);
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return false;
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}
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switch ($imageinfo['mime']) {
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case 'image/gif':
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$result = imagegif($im, $fullpath);
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switch ($ext) {
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case 'gif':
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$result = imagegif($im, $localPath);
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$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, $fullpath, REGENERATE_PICTURES_QUALITY);
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case 'jpeg':
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case 'jpg':
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$result = imagejpeg($im, $localPath, self::REGENERATE_PICTURES_QUALITY);
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$this->logger->log('debug', 'Re-creating jpg');
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break;
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case 'image/png':
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case 'png':
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$result = imagepng($im, $localPath, ceil(self::REGENERATE_PICTURES_QUALITY / 100 * 9));
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$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 $result;
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return '/assets/images/'.$relativePath.'/'.$hashImage.'.'.$ext;
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}
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private static function getAbsoluteLink($relativeLink, $url)
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/**
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* Generate the folder where we are going to save images based on the entry url.
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*
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* @param string $url
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*
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* @return string
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*/
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private function getRelativePath($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 $relativeLink;
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$hashUrl = hash('crc32', $url);
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$relativePath = $hashUrl[0].'/'.$hashUrl[1].'/'.$hashUrl;
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$folderPath = $this->baseFolder.'/'.$relativePath;
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if (!file_exists($folderPath)) {
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mkdir($folderPath, 0777, true);
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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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$this->logger->log('debug', 'Folder used for that url', ['folder' => $folderPath, 'url' => $url]);
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/* parse base URL and convert to local variables:
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$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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return $relativePath;
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}
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public static function getPocheUrl()
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/**
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* Make an $url absolute based on the $base.
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*
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* @see Graby->makeAbsoluteStr
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*
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* @param string $base Base url
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* @param string $url Url to make it absolute
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*
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* @return false|string
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*/
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private function getAbsoluteLink($base, $url)
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{
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$baseUrl = '';
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$https = (!empty($_SERVER['HTTPS'])
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&& (strtolower($_SERVER['HTTPS']) == 'on'))
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|| (isset($_SERVER['SERVER_PORT'])
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&& $_SERVER['SERVER_PORT'] == '443') // HTTPS detection.
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|| (isset($_SERVER['SERVER_PORT']) //Custom HTTPS port detection
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&& $_SERVER['SERVER_PORT'] == SSL_PORT)
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|| (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])
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&& $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https');
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$serverport = (!isset($_SERVER['SERVER_PORT'])
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|| $_SERVER['SERVER_PORT'] == '80'
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|| $_SERVER['SERVER_PORT'] == HTTP_PORT
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|| ($https && $_SERVER['SERVER_PORT'] == '443')
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|| ($https && $_SERVER['SERVER_PORT'] == SSL_PORT) //Custom HTTPS port detection
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? '' : ':'.$_SERVER['SERVER_PORT']);
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if (isset($_SERVER['HTTP_X_FORWARDED_PORT'])) {
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$serverport = ':'.$_SERVER['HTTP_X_FORWARDED_PORT'];
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}
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// $scriptname = str_replace('/index.php', '/', $_SERVER["SCRIPT_NAME"]);
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// if (!isset($_SERVER["HTTP_HOST"])) {
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// return $scriptname;
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// }
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$host = (isset($_SERVER['HTTP_X_FORWARDED_HOST']) ? $_SERVER['HTTP_X_FORWARDED_HOST'] : (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME']));
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if (strpos($host, ':') !== false) {
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$serverport = '';
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}
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// check if BASE_URL is configured
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if (BASE_URL) {
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$baseUrl = BASE_URL;
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} else {
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$baseUrl = 'http'.($https ? 's' : '').'://'.$host.$serverport;
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if (preg_match('!^https?://!i', $url)) {
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// already absolute
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return $url;
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}
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return $baseUrl;
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$base = new \SimplePie_IRI($base);
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// remove '//' in URL path (causes URLs not to resolve properly)
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if (isset($base->ipath)) {
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$base->ipath = preg_replace('!//+!', '/', $base->ipath);
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}
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if ($absolute = \SimplePie_IRI::absolutize($base, $url)) {
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return $absolute->get_uri();
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}
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return false;
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}
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}
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