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<?php
/**
* @package dompdf
* @link http://dompdf.github.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @author Helmut Tischer <htischer@weihenstephan.org>
* @author Fabien Ménager <fabien.menager@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf\Image;
use Dompdf\Dompdf;
use Dompdf\Helpers;
use Dompdf\Exception\ImageException;
/**
* Static class that resolves image urls and downloads and caches
* remote images if required.
*
* @package dompdf
*/
class Cache
{
/**
* Array of downloaded images. Cached so that identical images are
* not needlessly downloaded.
*
* @var array
*/
protected static $_cache = array();
/**
* The url to the "broken image" used when images can't be loaded
*
* @var string
*/
public static $broken_image = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABABAMAAABYR2ztAAAAA3NCSVQICAjb4U/gAAAAHlBMVEWZmZn////g4OCkpKS1tbXv7++9vb2tra3m5ub5+fkFnN6oAAAACXBIWXMAAAsSAAALEgHS3X78AAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M0BrLToAAAABZ0RVh0Q3JlYXRpb24gVGltZQAwNC8xMi8xMRPnI58AAAGZSURBVEiJhZbPasMwDMbTw2DHKhDQcbDQPsEge4BAjg0Mxh5gkBcY7Niwkpx32PvOjv9JspX60It/+fxJsqxW1b11gN11rA7N3v6vAd5nfR9fDYCTDiyzAeA6qgKd9QDNoAtsAKyKCxzAAfhdBuyHGwC3oovNvQOaxxJwnSNg3ZQFAlBy4ax7AG6ZBLrgA5Cn038SAPgREiaJHJASwXYEhEQQIACyikTTCWCBJJoANBfpPAKQdBLHFMBYkctcBKIE9lAGggt6gRjgA2GV44CL7m1WgS08fAAdsPHxyyMAIyHujgRwEldHArCKy5cBz90+gNOyf8TTyKOUQN2LPEmgnWWPcKD+sr+rnuqTK1avAcHfRSv3afTgVAbqmCPiggLtGM8aSkBNOidVjADrmIDYebT1PoGsWJEE8Oc0b96aZoe4iMBZPiADB6RAzEUA2vwRmyiAL3Lfv6MBSEmUEg7ALt/3LhxwLgj4QNw4UCbKEsaBNpPsyRbgVRASFig78BIGyJNIJQyQTwIi0RvgT98H+Mi6W67j3X8H/427u5bfpQGVAAAAAElFTkSuQmCC";
/**
* Current dompdf instance
*
* @var Dompdf
*/
protected static $_dompdf;
/**
* Resolve and fetch an image for use.
*
* @param string $url The url of the image
* @param string $protocol 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
* @param Dompdf $dompdf The Dompdf instance
*
* @throws ImageException
* @return array An array with two elements: The local path to the image and the image extension
*/
static function resolve_url($url, $protocol, $host, $base_path, Dompdf $dompdf)
{
self::$_dompdf = $dompdf;
$protocol = mb_strtolower($protocol);
$parsed_url = Helpers::explode_url($url);
$message = null;
$remote = ($protocol && $protocol !== "file://") || ($parsed_url['protocol'] != "");
$data_uri = strpos($parsed_url['protocol'], "data:") === 0;
$full_url = null;
$enable_remote = $dompdf->get_option("enable_remote");
try {
// Remote not allowed and is not DataURI
if (!$enable_remote && $remote && !$data_uri) {
throw new ImageException("Remote file access is disabled.", E_WARNING);
} // Remote allowed or DataURI
else {
if ($enable_remote && $remote || $data_uri) {
// Download remote files to a temporary directory
$full_url = Helpers::build_url($protocol, $host, $base_path, $url);
// From cache
if (isset(self::$_cache[$full_url])) {
$resolved_url = self::$_cache[$full_url];
} // From remote
else {
$tmp_dir = $dompdf->get_option("temp_dir");
$resolved_url = tempnam($tmp_dir, "ca_dompdf_img_");
$image = "";
if ($data_uri) {
if ($parsed_data_uri = Helpers::parse_data_uri($url)) {
$image = $parsed_data_uri['data'];
}
} else {
set_error_handler(array("\\Dompdf\\Helpers", "record_warnings"));
$image = file_get_contents($full_url, null, $dompdf->getHttpContext());
restore_error_handler();
}
// Image not found or invalid
if (strlen($image) == 0) {
$msg = ($data_uri ? "Data-URI could not be parsed" : "Image not found");
throw new ImageException($msg, E_WARNING);
} // Image found, put in cache and process
else {
//e.g. fetch.php?media=url.jpg&cache=1
//- Image file name might be one of the dynamic parts of the url, don't strip off!
//- a remote url does not need to have a file extension at all
//- local cached file does not have a matching file extension
//Therefore get image type from the content
file_put_contents($resolved_url, $image);
}
}
} // Not remote, local image
else {
$resolved_url = Helpers::build_url($protocol, $host, $base_path, $url);
}
}
// Check if the local file is readable
if (!is_readable($resolved_url) || !filesize($resolved_url)) {
throw new ImageException("Image not readable or empty", E_WARNING);
} // Check is the file is an image
else {
list($width, $height, $type) = Helpers::dompdf_getimagesize($resolved_url, $dompdf->getHttpContext());
// Known image type
if ($width && $height && in_array($type, array("gif", "png", "jpeg", "bmp", "svg"))) {
//Don't put replacement image into cache - otherwise it will be deleted on cache cleanup.
//Only execute on successful caching of remote image.
if ($enable_remote && $remote || $data_uri) {
self::$_cache[$full_url] = $resolved_url;
}
} // Unknown image type
else {
throw new ImageException("Image type unknown", E_WARNING);
}
}
} catch (ImageException $e) {
$resolved_url = self::$broken_image;
$type = "png";
$message = "Image not found or type unknown";
Helpers::record_warnings($e->getCode(), $e->getMessage() . " \n $url", $e->getFile(), $e->getLine());
}
return array($resolved_url, $type, $message);
}
/**
* Unlink all cached images (i.e. temporary images either downloaded
* or converted)
*/
static function clear()
{
if (empty(self::$_cache) || self::$_dompdf->get_option("debugKeepTemp")) {
return;
}
foreach (self::$_cache as $file) {
if (self::$_dompdf->get_option("debugPng")) {
print "[clear unlink $file]";
}
unlink($file);
}
self::$_cache = array();
}
static function detect_type($file, $context = null)
{
list(, , $type) = Helpers::dompdf_getimagesize($file, $context);
return $type;
}
static function is_broken($url)
{
return $url === self::$broken_image;
}
}
if (file_exists(realpath(__DIR__ . "/../../lib/res/broken_image.png"))) {
Cache::$broken_image = realpath(__DIR__ . "/../../lib/res/broken_image.png");
}
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