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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 = [];
/**
* @var array
*/
protected static $tempImages = [];
/**
* The url to the "broken image" used when images can't be loaded
*
* @var string
*/
public static $broken_image = "data:image/svg+xml;charset=utf8,%3C?xml version='1.0'?%3E%3Csvg width='64' height='64' xmlns='http://www.w3.org/2000/svg'%3E%3Cg%3E%3Crect stroke='%23666666' id='svg_1' height='60.499994' width='60.166667' y='1.666669' x='1.999998' stroke-width='1.5' fill='none'/%3E%3Cline stroke-linecap='null' stroke-linejoin='null' id='svg_3' y2='59.333253' x2='59.749916' y1='4.333415' x1='4.250079' stroke-width='1.5' stroke='%23999999' fill='none'/%3E%3Cline stroke-linecap='null' stroke-linejoin='null' id='svg_4' y2='59.999665' x2='4.062838' y1='3.750342' x1='60.062164' stroke-width='1.5' stroke='%23999999' fill='none'/%3E%3C/g%3E%3C/svg%3E";
public static $error_message = "Image not found or type unknown";
/**
* 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->getOptions()->getIsRemoteEnabled();
$tempfile = false;
try {
// Remote not allowed and is not DataURI
if (!$enable_remote && $remote && !$data_uri) {
throw new ImageException("Remote file access is disabled.", E_WARNING);
}
// remote allowed or DataURI
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 = $dompdf->getOptions()->getTempDir();
if (($resolved_url = @tempnam($tmp_dir, "ca_dompdf_img_")) === false) {
throw new ImageException("Unable to create temporary image in " . $tmp_dir, E_WARNING);
}
$tempfile = $resolved_url;
$image = null;
if ($data_uri) {
if ($parsed_data_uri = Helpers::parse_data_uri($url)) {
$image = $parsed_data_uri['data'];
}
} else {
list($image, $http_response_header) = Helpers::getFileContent($full_url, $dompdf->getHttpContext());
}
// Image not found or invalid
if ($image === null) {
$msg = ($data_uri ? "Data-URI could not be parsed" : "Image not found");
throw new ImageException($msg, E_WARNING);
} // Image found, put in cache and process
else {
//e.g. fetch.php?media=url.jpg&cache=1
//- Image file name might be one of the dynamic parts of the url, don't strip off!
//- a remote url does not need to have a file extension at all
//- local cached file does not have a matching file extension
//Therefore get image type from the content
if (@file_put_contents($resolved_url, $image) === false) {
throw new ImageException("Unable to create temporary image in " . $tmp_dir, E_WARNING);
}
}
}
} // Not remote, local image
else {
$resolved_url = Helpers::build_url($protocol, $host, $base_path, $url);
if ($protocol === "" || $protocol === "file://") {
$realfile = realpath($resolved_url);
$rootDir = realpath($dompdf->getOptions()->getRootDir());
if (strpos($realfile, $rootDir) !== 0) {
$chroot = $dompdf->getOptions()->getChroot();
$chrootValid = false;
foreach ($chroot as $chrootPath) {
$chrootPath = realpath($chrootPath);
if ($chrootPath !== false && strpos($realfile, $chrootPath) === 0) {
$chrootValid = true;
break;
}
}
if ($chrootValid !== true) {
throw new ImageException("Permission denied on $resolved_url. The file could not be found under the paths specified by Options::chroot.", E_WARNING);
}
}
if (!$realfile) {
throw new ImageException("File '$realfile' not found.", E_WARNING);
}
$resolved_url = $realfile;
}
}
// Check if the local file is readable
if (!is_readable($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, ["gif", "png", "jpeg", "bmp", "svg","webp"], true)) {
//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 $e) {
if ($tempfile) {
unlink($tempfile);
}
$resolved_url = self::$broken_image;
$type = "png";
$message = self::$error_message;
Helpers::record_warnings($e->getCode(), $e->getMessage() . " \n $url", $e->getFile(), $e->getLine());
self::$_cache[$full_url] = $resolved_url;
}
return [$resolved_url, $type, $message];
}
/**
* Register a temp file for the given original image file.
*
* @param string $filePath The path of the original image.
* @param string $tempPath The path of the temp file to register.
* @param string $key An optional key to register the temp file at.
*/
static function addTempImage(string $filePath, string $tempPath, string $key = "default"): void
{
if (!isset(self::$tempImages[$filePath])) {
self::$tempImages[$filePath] = [];
}
self::$tempImages[$filePath][$key] = $tempPath;
}
/**
* Get the path of a temp file registered for the given original image file.
*
* @param string $filePath The path of the original image.
* @param string $key The key the temp file is registered at.
*/
static function getTempImage(string $filePath, string $key = "default"): ?string
{
return self::$tempImages[$filePath][$key] ?? null;
}
/**
* Unlink all cached images (i.e. temporary images either downloaded
* or converted) except for the bundled "broken image"
*/
static function clear(bool $debugPng = false)
{
foreach (self::$_cache as $file) {
if ($file === self::$broken_image) {
continue;
}
if ($debugPng) {
print "[clear unlink $file]";
}
unlink($file);
}
foreach (self::$tempImages as $versions) {
foreach ($versions as $file) {
if ($file === self::$broken_image) {
continue;
}
if ($debugPng) {
print "[unlink temp image $file]";
}
if (file_exists($file)) {
unlink($file);
}
}
}
self::$_cache = [];
self::$tempImages = [];
}
static function detect_type($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.svg"))) {
Cache::$broken_image = realpath(__DIR__ . "/../../lib/res/broken_image.svg");
}