Download pictures successfully

[github/wallabag/wallabag.git] / src / Wallabag / CoreBundle / Helper / DownloadImages.php

diff --git a/src/Wallabag/CoreBundle/Helper/DownloadImages.php b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
new file mode 100644 (file)
index 0000000..32a9dbb
--- /dev/null
+++ b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
@@ -0,0 +1,147 @@
+<?php
+
+namespace Wallabag\CoreBundle\Helper;
+
+use Psr\Log\LoggerInterface as Logger;
+use Symfony\Component\DomCrawler\Crawler;
+
+define('REGENERATE_PICTURES_QUALITY', 75);
+
+class DownloadImages {
+    private $folder;
+    private $url;
+    private $html;
+    private $fileName;
+    private $logger;
+
+    public function __construct($html, $url, Logger $logger) {
+        $this->html = $html;
+        $this->url = $url;
+        $this->setFolder();
+        $this->logger = $logger;
+    }
+
+    public function setFolder($folder = "assets/images") {
+        // if folder doesn't exist, attempt to create one and store the folder name in property $folder
+        if(!file_exists($folder)) {
+            mkdir($folder);
+        }
+        $this->folder = $folder;
+    }
+
+    public function process() {
+        //instantiate the symfony DomCrawler Component
+        $crawler = new Crawler($this->html);
+        // create an array of all scrapped image links
+        $this->logger->log('debug', 'Finding images inside document');
+        $result = $crawler
+            ->filterXpath('//img')
+            ->extract(array('src'));
+
+        // download and save the image to the folder
+        foreach ($result as $image) {
+            $file = file_get_contents($image);
+
+            // Checks
+            $absolute_path = self::getAbsoluteLink($image, $this->url);
+            $filename = basename(parse_url($absolute_path, PHP_URL_PATH));
+            $fullpath = $this->folder."/".$filename;
+            self::checks($file, $fullpath, $absolute_path);
+            $this->html = str_replace($image, $fullpath, $this->html);
+        }
+
+        return $this->html;
+    }
+
+    private function checks($rawdata, $fullpath, $absolute_path) {
+        $fullpath = urldecode($fullpath);
+
+        if (file_exists($fullpath)) {
+            unlink($fullpath);
+        }
+
+        // check extension
+        $this->logger->log('debug','Checking extension');
+
+        $file_ext = strrchr($fullpath, '.');
+        $whitelist = array('.jpg', '.jpeg', '.gif', '.png');
+        if (!(in_array($file_ext, $whitelist))) {
+            $this->logger->log('debug','processed image with not allowed extension. Skipping '.$fullpath);
+
+            return false;
+        }
+
+        // check headers
+        $this->logger->log('debug','Checking headers');
+        $imageinfo = getimagesize($absolute_path);
+        if ($imageinfo['mime'] != 'image/gif' && $imageinfo['mime'] != 'image/jpeg' && $imageinfo['mime'] != 'image/jpg' && $imageinfo['mime'] != 'image/png') {
+            $this->logger->log('debug','processed image with bad header. Skipping '.$fullpath);
+
+            return false;
+        }
+
+        // regenerate image
+        $this->logger->log('debug','regenerating image');
+        $im = imagecreatefromstring($rawdata);
+        if ($im === false) {
+            $this->logger->log('error','error while regenerating image '.$fullpath);
+
+            return false;
+        }
+
+        switch ($imageinfo['mime']) {
+            case 'image/gif':
+                $result = imagegif($im, $fullpath);
+                $this->logger->log('debug','Re-creating gif');
+                break;
+            case 'image/jpeg':
+            case 'image/jpg':
+                $result = imagejpeg($im, $fullpath, REGENERATE_PICTURES_QUALITY);
+                $this->logger->log('debug','Re-creating jpg');
+                break;
+            case 'image/png':
+                $this->logger->log('debug','Re-creating png');
+                $result = imagepng($im, $fullpath, ceil(REGENERATE_PICTURES_QUALITY / 100 * 9));
+                break;
+        }
+        imagedestroy($im);
+
+        return $result;
+    }
+
+    private static function getAbsoluteLink($relativeLink, $url)
+    {
+        /* return if already absolute URL */
+        if (parse_url($relativeLink, PHP_URL_SCHEME) != '') {
+            return $relativeLink;
+        }
+
+        /* queries and anchors */
+        if ($relativeLink[0] == '#' || $relativeLink[0] == '?') {
+            return $url.$relativeLink;
+        }
+
+        /* parse base URL and convert to local variables:
+           $scheme, $host, $path */
+        extract(parse_url($url));
+
+        /* remove non-directory element from path */
+        $path = preg_replace('#/[^/]*$#', '', $path);
+
+        /* destroy path if relative url points to root */
+        if ($relativeLink[0] == '/') {
+            $path = '';
+        }
+
+        /* dirty absolute URL */
+        $abs = $host.$path.'/'.$relativeLink;
+
+        /* replace '//' or '/./' or '/foo/../' with '/' */
+        $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
+        for ($n = 1; $n > 0; $abs = preg_replace($re, '/', $abs, -1, $n)) {
+        }
+
+        /* absolute URL is ready! */
+        return $scheme.'://'.$abs;
+    }
+}