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218 lines
7.2 KiB
218 lines
7.2 KiB
<?php
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/**
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* DOMPDF - PHP5 HTML to PDF renderer
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*
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* File: $RCSfile: image_cache.cls.php,v $
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* Created on: 2004-08-08
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*
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* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library in the file LICENSE.LGPL; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* Alternatively, you may distribute this software under the terms of the
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* PHP License, version 3.0 or later. A copy of this license should have
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* been distributed with this file in the file LICENSE.PHP . If this is not
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* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
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*
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* The latest version of DOMPDF might be available at:
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* http://www.dompdf.com/
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*
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* @link http://www.dompdf.com/
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* @copyright 2004 Benj Carson
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* @author Benj Carson <benjcarson@digitaljunkies.ca>
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* @contributor Helmut Tischer <htischer@weihenstephan.org>
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* @package dompdf
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*
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* Changes
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* @contributor Helmut Tischer <htischer@weihenstephan.org>
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* @version 0.5.1.htischer.20090507
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* - On getting type of images don't require any file endings
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* and don't strip off url parameters,
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* to allowing dynamically generated sites with image id
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* in url parameters and not at end of url or missing file extension
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* @contributor Helmut Tischer <htischer@weihenstephan.org>
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* @version dompdf_trunk_with_helmut_mods.20090524
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* - Made debug messages more individually configurable
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* @version 20090622
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* - don't cache broken image, but refer to original broken image replacement
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*/
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/* $Id: image_cache.cls.php 216 2010-03-11 22:49:18Z ryan.masten $ */
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/**
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* Static class that resolves image urls and downloads and caches
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* remote images if required.
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*
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* @access private
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* @package dompdf
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*/
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class Image_Cache {
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/**
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* Array of downloaded images. Cached so that identical images are
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* not needlessly downloaded.
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*
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* @var array
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*/
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static protected $_cache = array();
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/**
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* Resolve and fetch an image for use.
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*
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* @param string $url The url of the image
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* @param string $proto Default protocol if none specified in $url
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* @param string $host Default host if none specified in $url
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* @param string $base_path Default path if none specified in $url
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* @return array An array with two elements: The local path to the image and the image extension
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*/
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static function resolve_url($url, $proto, $host, $base_path) {
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global $_dompdf_warnings;
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$parsed_url = explode_url($url);
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$DEBUGPNG=DEBUGPNG; //=DEBUGPNG; Allow override of global setting for ad hoc debug
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$full_url_dbg = '';
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//debugpng
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if ($DEBUGPNG) print 'resolve_url('.$url.','.$proto.','.$host.','.$base_path.')('.$parsed_url['protocol'].')';
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$remote = ($proto != "" && $proto !== "file://");
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$remote = $remote || ($parsed_url['protocol'] != "");
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if ( !DOMPDF_ENABLE_REMOTE && $remote ) {
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$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
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$ext = "png";
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//debugpng
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if ($DEBUGPNG) $full_url_dbg = '(blockedremote)';
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} else if ( DOMPDF_ENABLE_REMOTE && $remote ) {
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// Download remote files to a temporary directory
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$full_url = build_url($proto, $host, $base_path, $url);
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if ( isset(self::$_cache[$full_url]) ) {
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list($resolved_url,$ext) = self::$_cache[$full_url];
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//debugpng
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if ($DEBUGPNG) $full_url_dbg = $full_url.'(cache)';
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} else {
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$resolved_url = tempnam(DOMPDF_TEMP_DIR, "ca_dompdf_img_");
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//debugpng
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if ($DEBUGPNG) echo $resolved_url . "\n";
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$old_err = set_error_handler("record_warnings");
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$image = file_get_contents($full_url);
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restore_error_handler();
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if ( strlen($image) == 0 ) {
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//target image not found
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$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
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$ext = "png";
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//debugpng
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if ($DEBUGPNG) $full_url_dbg = $full_url.'(missing)';
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} else {
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file_put_contents($resolved_url, $image);
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//e.g. fetch.php?media=url.jpg&cache=1
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//- Image file name might be one of the dynamic parts of the url, don't strip off!
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// if ( preg_match("/.*\.(\w+)/",$url,$match) ) $ext = $match[1];
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//- a remote url does not need to have a file extension at all
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//- local cached file does not have a matching file extension
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//Therefore get image type from the content
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$imagedim = getimagesize($resolved_url);
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if( $imagedim[2] >= 1 && $imagedim[2] <=3 && $imagedim[0] && $imagedim[1] ) {
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//target image is valid
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$imagetypes = array('','gif','jpeg','png','swf');
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$ext = $imagetypes[$imagedim[2]];
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if ( rename($resolved_url,$resolved_url.'.'.$ext) ) {
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$resolved_url .= '.'.$ext;
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}
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//Don't put replacement image into cache - otherwise it will be deleted on cache cleanup.
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//Only execute on successfull caching of remote image.
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self::$_cache[$full_url] = array($resolved_url,$ext);
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} else {
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//target image is not valid.
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unlink($resolved_url);
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$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
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$ext = "png";
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}
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}
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}
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} else {
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$resolved_url = build_url($proto, $host, $base_path, $url);
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if ($DEBUGPNG) print 'build_url('.$proto.','.$host.','.$base_path.','.$url.')('.$resolved_url.')';
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if ( !preg_match("/.*\.(\w+)/",$url,$match) ) {
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//debugpng
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if ($DEBUGPNG) print '[resolve_url exception '.$url.']';
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throw new DOMPDF_Exception("Unknown image type: $url.");
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}
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$ext = $match[1];
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//debugpng
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if ($DEBUGPNG) $full_url_dbg = '(local)';
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}
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if ( !is_readable($resolved_url) || !filesize($resolved_url) ) {
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//debugpng
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if ($DEBUGPNG) $full_url_dbg .= '(nocache'.$resolved_url.')';
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$_dompdf_warnings[] = "File " .$resolved_url . " is not readable or is an empty file.\n";
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$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
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$ext = "png";
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}
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//debugpng
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if ($DEBUGPNG) print '[resolve_url '.$url.'|'.$full_url_dbg.'|'.$resolved_url.'|'.$ext.']';
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return array($resolved_url, $ext);
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}
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/**
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* Unlink all cached images (i.e. temporary images either downloaded
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* or converted)
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*/
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static function clear() {
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if ( count(self::$_cache) ) {
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while ($entry = array_shift(self::$_cache)) {
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list($file, $ext) = $entry;
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//debugpng
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if (DEBUGPNG) print '[clear unlink '.$file.']';
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if (!DEBUGKEEPTEMP)
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//XXX: Should we have some kind of fallback or warning if unlink() fails?
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unlink($file);
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}
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}
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}
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}
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