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Edit File : Cache.php \| Size : 8.35 KB
<?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 = []; /* * 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 = $dompdf->getOptions()->getIsRemoteEnabled(); try { // Remote not allowed and is not DataURI if (!$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); } $image = ""; if ($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, $dompdf->getHttpContext()); } // Image not found or invalid if (empty($image)) { $msg = ($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) { $chroot = realpath($dompdf->getOptions()->getChroot()); if (!$chroot \|\| strpos($realfile, $chroot) !== 0) { throw new ImageException("Permission denied on $resolved_url. The file could not be found under the directory specified by Options::chroot.", E_WARNING); } } if (!$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"])) { //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"; $message = self::$error_message; Helpers::record_warnings($e->getCode(), $e->getMessage() . " \n $url", $e->getFile(), $e->getLine()); } return [$resolved_url, $type, $message]; } /* * Unlink all cached images (i.e. temporary images either downloaded * or converted) */ static function clear() { if (empty(self::$_cache) \|\| self::$_dompdf->getOptions()->getDebugKeepTemp()) { return; } foreach (self::$_cache as $file) { if (self::$_dompdf->getOptions()->getDebugPng()) { print "[clear unlink $file]"; } unlink($file); } self::$_cache = []; } static function detect_type($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"); } Back

Edit File : Cache.php | Size : 8.35 KB

<?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 = [];

/**
     * 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();

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);
                    }
                    $image = "";

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 (empty($image)) {
                        $msg = ($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) {
                        $chroot = realpath($dompdf->getOptions()->getChroot());
                        if (!$chroot || strpos($realfile, $chroot) !== 0) {
                            throw new ImageException("Permission denied on $resolved_url. The file could not be found under the directory 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"])) {
                    //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";
            $message = self::$error_message;
            Helpers::record_warnings($e->getCode(), $e->getMessage() . " \n $url", $e->getFile(), $e->getLine());
        }

return [$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->getOptions()->getDebugKeepTemp()) {
            return;
        }

foreach (self::$_cache as $file) {
            if (self::$_dompdf->getOptions()->getDebugPng()) {
                print "[clear unlink $file]";
            }
            unlink($file);
        }

self::$_cache = [];
    }

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");
}

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