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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
*/
/**
* 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();
/**
* The url to the "broken image" used when images can't be loade
*
* @var string
*/
public static $broken_image;
/**
* 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 $dompdf The DOMPDF instance
*
* @throws DOMPDF_Image_Exception
* @return array An array with two elements: The local path to the image and the image extension
*/
static function resolve_url($url, $protocol, $host, $base_path, DOMPDF $dompdf) {
$parsed_url = explode_url($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 DOMPDF_Image_Exception("DOMPDF_ENABLE_REMOTE is set to FALSE");
}
// Remote allowed or DataURI
else if ( $enable_remote && $remote || $data_uri ) {
// Download remote files to a temporary directory
$full_url = build_url($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 ($parsed_data_uri = parse_data_uri($url)) {
$image = $parsed_data_uri['data'];
}
}
else {
set_error_handler("record_warnings");
$image = file_get_contents($full_url);
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 DOMPDF_Image_Exception($msg);
}
// Image found, put in cache and process
else {
//e.g. fetch.php?media=url.jpg&cache=1
//- Image file name might be one of the dynamic parts of the url, don't strip off!
//- a remote url does not need to have a file extension at all
//- local cached file does not have a matching file extension
//Therefore get image type from the content
file_put_contents($resolved_url, $image);
}
}
}
// Not remote, local image
else {
$resolved_url = build_url($protocol, $host, $base_path, $url);
}
// Check if the local file is readable
if ( !is_readable($resolved_url) || !filesize($resolved_url) ) {
throw new DOMPDF_Image_Exception("Image not readable or empty");
}
// Check is the file is an image
else {
list($width, $height, $type) = dompdf_getimagesize($resolved_url);
// Known image type
if ( $width && $height && in_array($type, array(IMAGETYPE_GIF, IMAGETYPE_PNG, IMAGETYPE_JPEG, IMAGETYPE_BMP)) ) {
//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 DOMPDF_Image_Exception("Image type unknown");
}
}
}
catch(DOMPDF_Image_Exception $e) {
$resolved_url = self::$broken_image;
$type = IMAGETYPE_PNG;
$message = $e->getMessage()." \n $url";
}
return array($resolved_url, $type, $message);
}
/**
* Unlink all cached images (i.e. temporary images either downloaded
* or converted)
*/
static function clear() {
if ( empty(self::$_cache) || DEBUGKEEPTEMP ) return;
foreach ( self::$_cache as $file ) {
if (DEBUGPNG) print "[clear unlink $file]";
unlink($file);
}
self::$_cache = array();
}
static function detect_type($file) {
list(, , $type) = dompdf_getimagesize($file);
return $type;
}
static function type_to_ext($type) {
$image_types = array(
IMAGETYPE_GIF => "gif",
IMAGETYPE_PNG => "png",
IMAGETYPE_JPEG => "jpeg",
IMAGETYPE_BMP => "bmp",
);
return (isset($image_types[$type]) ? $image_types[$type] : null);
}
static function is_broken($url) {
return $url === self::$broken_image;
}
}
Image_Cache::$broken_image = DOMPDF_LIB_DIR . "/res/broken_image.png";
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