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<?php
/**
* DOMPDF - PHP5 HTML to PDF renderer
*
* File: $RCSfile: image_cache.cls.php,v $
* Created on: 2004-08-08
*
* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library in the file LICENSE.LGPL; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
* Alternatively, you may distribute this software under the terms of the
* PHP License, version 3.0 or later. A copy of this license should have
* been distributed with this file in the file LICENSE.PHP . If this is not
* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
*
* The latest version of DOMPDF might be available at:
* http://www.dompdf.com/
*
* @link http://www.dompdf.com/
* @copyright 2004 Benj Carson
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @contributor Helmut Tischer <htischer@weihenstephan.org>
* @package dompdf
*
* Changes
* @contributor Helmut Tischer <htischer@weihenstephan.org>
* @version 0.5.1.htischer.20090507
* - On getting type of images don't require any file endings
* and don't strip off url parameters,
* to allowing dynamically generated sites with image id
* in url parameters and not at end of url or missing file extension
* @contributor Helmut Tischer <htischer@weihenstephan.org>
* @version dompdf_trunk_with_helmut_mods.20090524
* - Made debug messages more individually configurable
* @version 20090622
* - don't cache broken image, but refer to original broken image replacement
*/
/* $Id: image_cache.cls.php 354 2011-01-24 21:59:54Z fabien.menager $ */
/**
* Static class that resolves image urls and downloads and caches
* remote images if required.
*
* @access private
* @package dompdf
*/
class Image_Cache {
/**
* Array of downloaded images. Cached so that identical images are
* not needlessly downloaded.
*
* @var array
*/
static protected $_cache = array();
/**
* Resolve and fetch an image for use.
*
* @param string $url The url of the image
* @param string $proto Default protocol if none specified in $url
* @param string $host Default host if none specified in $url
* @param string $base_path Default path if none specified in $url
* @return array An array with two elements: The local path to the image and the image extension
*/
static function resolve_url($url, $proto, $host, $base_path) {
global $_dompdf_warnings;
$parsed_url = explode_url($url);
$DEBUGPNG=DEBUGPNG; //=DEBUGPNG; Allow override of global setting for ad hoc debug
$full_url_dbg = '';
//debugpng
if ($DEBUGPNG) print 'resolve_url('.$url.','.$proto.','.$host.','.$base_path.')('.$parsed_url['protocol'].')';
$remote = ($proto != "" && $proto !== "file://");
$remote = $remote || ($parsed_url['protocol'] != "");
$datauri = strpos($parsed_url['protocol'], "data:") === 0;
if ( !DOMPDF_ENABLE_REMOTE && $remote && !$datauri ) {
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
$ext = "png";
//debugpng
if ($DEBUGPNG) $full_url_dbg = '(blockedremote)';
}
else if ( DOMPDF_ENABLE_REMOTE && $remote || $datauri ) {
// Download remote files to a temporary directory
$full_url = build_url($proto, $host, $base_path, $url);
if ( isset(self::$_cache[$full_url]) ) {
list($resolved_url,$ext) = self::$_cache[$full_url];
//debugpng
if ($DEBUGPNG) $full_url_dbg = $full_url.'(cache)';
} else {
$resolved_url = tempnam(DOMPDF_TEMP_DIR, "ca_dompdf_img_");
//debugpng
if ($DEBUGPNG) echo $resolved_url . "
";
if ($datauri) {
if ($parsed_data_uri = parse_data_uri($url)) {
$image = $parsed_data_uri['data'];
list(, $ext) = explode('/', $parsed_data_uri['mime'], 2);
}
}
else {
$old_err = set_error_handler("record_warnings");
$image = file_get_contents($full_url);
restore_error_handler();
}
if ( strlen($image) == 0 ) {
//target image not found
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
$ext = "png";
//debugpng
if ($DEBUGPNG) $full_url_dbg = $full_url.'(missing)';
} else {
file_put_contents($resolved_url, $image);
//e.g. fetch.php?media=url.jpg&cache=1
//- Image file name might be one of the dynamic parts of the url, don't strip off!
// if ( preg_match("/.*\.(\w+)/",$url,$match) ) $ext = $match[1];
//- a remote url does not need to have a file extension at all
//- local cached file does not have a matching file extension
//Therefore get image type from the content
$imagedim = dompdf_getimagesize($resolved_url);
if( $imagedim[0] && $imagedim[1] &&
in_array($imagedim[2], array(IMAGETYPE_GIF, IMAGETYPE_PNG, IMAGETYPE_JPEG, IMAGETYPE_BMP)) ) {
//target image is valid
$imagetypes = array('','gif','jpeg','png','swf','psd','bmp');
$ext = $imagetypes[$imagedim[2]];
if ( rename($resolved_url,$resolved_url.'.'.$ext) ) {
$resolved_url .= '.'.$ext;
}
//Don't put replacement image into cache - otherwise it will be deleted on cache cleanup.
//Only execute on successfull caching of remote image.
self::$_cache[$full_url] = array($resolved_url,$ext);
} else {
//target image is not valid.
unlink($resolved_url);
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
$ext = "png";
}
}
}
} else {
$resolved_url = build_url($proto, $host, $base_path, $url);
if ($DEBUGPNG) print 'build_url('.$proto.','.$host.','.$base_path.','.$url.')('.$resolved_url.')';
if ( !preg_match("/.*\.(\w+)/",$url,$match) ) {
//debugpng
if ($DEBUGPNG) print '[resolve_url exception '.$url.']';
throw new DOMPDF_Exception("Unknown image type: $url.");
}
$ext = $match[1];
//debugpng
if ($DEBUGPNG) $full_url_dbg = '(local)';
}
if ( !is_readable($resolved_url) || !filesize($resolved_url) ) {
//debugpng
if ($DEBUGPNG) $full_url_dbg .= '(nocache'.$resolved_url.')';
$_dompdf_warnings[] = "File " .$resolved_url . " is not readable or is an empty file.
";
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
$ext = "png";
}
//debugpng
if ($DEBUGPNG) print '[resolve_url '.$url.'|'.$full_url_dbg.'|'.$resolved_url.'|'.$ext.']';
return array($resolved_url, $ext);
}
/**
* Unlink all cached images (i.e. temporary images either downloaded
* or converted)
*/
static function clear() {
if ( count(self::$_cache) ) {
while ($entry = array_shift(self::$_cache)) {
list($file, $ext) = $entry;
//debugpng
if (DEBUGPNG) print '[clear unlink '.$file.']';
if (!DEBUGKEEPTEMP)
//XXX: Should we have some kind of fallback or warning if unlink() fails?
unlink($file);
}
}
}
}
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