159 lines
4.7 KiB
PHP
159 lines
4.7 KiB
PHP
<?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.digitaljunkies.ca/dompdf
|
|
*
|
|
* @link http://www.digitaljunkies.ca/dompdf
|
|
* @copyright 2004 Benj Carson
|
|
* @author Benj Carson <benjcarson@digitaljunkies.ca>
|
|
* @package dompdf
|
|
* @version 0.5.1
|
|
*/
|
|
|
|
/* $Id */
|
|
|
|
/**
|
|
* 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;
|
|
|
|
|
|
$resolved_url = null;
|
|
|
|
// Remove dynamic part of url to determine the file extension
|
|
$tmp = preg_replace('/\?.*/','',$url);
|
|
|
|
// We need to preserve the file extenstion
|
|
$i = mb_strrpos($tmp, ".");
|
|
if ( $i === false )
|
|
throw new DOMPDF_Exception("Unknown image type: $url.");
|
|
|
|
$ext = mb_strtolower(mb_substr($tmp, $i+1));
|
|
|
|
$parsed_url = explode_url($url);
|
|
|
|
$remote = ($proto != "" && $proto != "file://");
|
|
$remote = $remote || ($parsed_url['protocol'] != "");
|
|
|
|
if ( !DOMPDF_ENABLE_REMOTE && $remote ) {
|
|
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
|
|
$ext = "png";
|
|
|
|
} else if ( DOMPDF_ENABLE_REMOTE && $remote ) {
|
|
// Download remote files to a temporary directory
|
|
$url = build_url($proto, $host, $base_path, $url);
|
|
|
|
if ( isset(self::$_cache[$url]) ) {
|
|
list($resolved_url,$ext) = self::$_cache[$url];
|
|
//echo "Using cached image $url (" . $resolved_url . ")\n";
|
|
|
|
} else {
|
|
|
|
//echo "Downloading file $url to temporary location: ";
|
|
$resolved_url = tempnam(DOMPDF_TEMP_DIR, "dompdf_img_");
|
|
//echo $resolved_url . "\n";
|
|
|
|
$old_err = set_error_handler("record_warnings");
|
|
$image = file_get_contents($url);
|
|
restore_error_handler();
|
|
|
|
if ( strlen($image) == 0 ) {
|
|
$image = file_get_contents(DOMPDF_LIB_DIR . "/res/broken_image.png");
|
|
$ext = "png";
|
|
}
|
|
|
|
file_put_contents($resolved_url, $image);
|
|
|
|
self::$_cache[$url] = array($resolved_url,$ext);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
$resolved_url = build_url($proto, $host, $base_path, $url);
|
|
|
|
//echo $resolved_url . "\n";
|
|
|
|
}
|
|
|
|
if ( !is_readable($resolved_url) || !filesize($resolved_url) ) {
|
|
$_dompdf_warnings[] = "File " .$resolved_url . " is not readable or is an empty file.\n";
|
|
$resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png";
|
|
$ext = "png";
|
|
}
|
|
|
|
// Assume for now that all dynamic images are pngs
|
|
if ( $ext == "php" )
|
|
$ext = "png";
|
|
|
|
return array($resolved_url, $ext);
|
|
|
|
}
|
|
|
|
/**
|
|
* Unlink all cached images (i.e. temporary images either downloaded
|
|
* or converted)
|
|
*/
|
|
static function clear() {
|
|
if ( count(self::$_cache) ) {
|
|
foreach (self::$_cache as $entry) {
|
|
list($file, $ext) = $entry;
|
|
unlink($file);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
?>
|