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<?php
/**
* wallabag, self hostable application allowing you to not miss any content anymore
*
* @category wallabag
* @author Nicolas Lœuillet <nicolas@loeuillet.org>
* @copyright 2013
* @license http://opensource.org/licenses/MIT see COPYING file
*/
final class Picture
{
/**
* Changing pictures URL in article content
*/
public static function filterPicture($content, $url, $id)
{
$matches = array();
$processing_pictures = array(); // list of processing image to avoid processing the same pictures twice
preg_match_all('#<\s*(img)[^>]+src="([^"]*)"[^>]*>#Si', $content, $matches, PREG_SET_ORDER);
foreach($matches as $i => $link) {
$link[1] = trim($link[1]);
if (!preg_match('#^(([a-z]+://)|(\#))#', $link[1])) {
$absolute_path = self::_getAbsoluteLink($link[2], $url);
$filename = basename(parse_url($absolute_path, PHP_URL_PATH));
$directory = self::_createAssetsDirectory($id);
$fullpath = $directory . '/' . $filename;
if (in_array($absolute_path, $processing_pictures) === true) {
// replace picture's URL only if processing is OK : already processing -> go to next picture
continue;
}
if (self::_downloadPictures($absolute_path, $fullpath) === true) {
$content = str_replace($matches[$i][2], Tools::getPocheUrl() . $fullpath, $content);
}
$processing_pictures[] = $absolute_path;
}
}
return $content;
}
/**
* Get absolute URL
*/
private static function _getAbsoluteLink($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;
}
/**
* Downloading pictures
*
* @return bool true if the download and processing is OK, false else
*/
private static function _downloadPictures($absolute_path, $fullpath)
{
$rawdata = Tools::getFile($absolute_path);
$fullpath = urldecode($fullpath);
if(file_exists($fullpath)) {
unlink($fullpath);
}
// check extension
$file_ext = strrchr($fullpath, '.');
$whitelist = array(".jpg",".jpeg",".gif",".png");
if (!(in_array($file_ext, $whitelist))) {
Tools::logm('processed image with not allowed extension. Skipping ' . $fullpath);
return false;
}
// check headers
$imageinfo = getimagesize($absolute_path);
if ($imageinfo['mime'] != 'image/gif' && $imageinfo['mime'] != 'image/jpeg'&& $imageinfo['mime'] != 'image/jpg'&& $imageinfo['mime'] != 'image/png') {
Tools::logm('processed image with bad header. Skipping ' . $fullpath);
return false;
}
// regenerate image
$im = imagecreatefromstring($rawdata);
if ($im === false) {
Tools::logm('error while regenerating image ' . $fullpath);
return false;
}
switch ($imageinfo['mime']) {
case 'image/gif':
$result = imagegif($im, $fullpath);
break;
case 'image/jpeg':
case 'image/jpg':
$result = imagejpeg($im, $fullpath, REGENERATE_PICTURES_QUALITY);
break;
case 'image/png':
$result = imagepng($im, $fullpath, ceil(REGENERATE_PICTURES_QUALITY / 100 * 9));
break;
}
imagedestroy($im);
return $result;
}
/**
* Create a directory for an article
*
* @param $id ID of the article
* @return string
*/
private static function _createAssetsDirectory($id)
{
$assets_path = ABS_PATH;
if (!is_dir($assets_path)) {
mkdir($assets_path, 0715);
}
$article_directory = $assets_path . $id;
if (!is_dir($article_directory)) {
mkdir($article_directory, 0715);
}
return $article_directory;
}
/**
* Remove the directory
*
* @param $directory
* @return bool
*/
public static function removeDirectory($directory)
{
if (is_dir($directory)) {
$files = array_diff(scandir($directory), array('.','..'));
foreach ($files as $file) {
(is_dir("$directory/$file")) ? self::removeDirectory("$directory/$file") : unlink("$directory/$file");
}
return rmdir($directory);
}
}
}
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