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image.php
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image.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This file is responsible for serving the one theme and plugin images.
*
* @package moodlecore
* @copyright 2009 Petr Skoda (skodak) {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
// disable moodle specific debug messages and any errors in output,
// comment out when debugging or better look into error log!
define('NO_DEBUG_DISPLAY', true);
// we need just the values from config.php and minlib.php
define('ABORT_AFTER_CONFIG', true);
require('../config.php'); // this stops immediately at the beginning of lib/setup.php
$themename = min_optional_param('theme', 'standard', 'SAFEDIR');
$component = min_optional_param('component', 'moodle', 'SAFEDIR');
$image = min_optional_param('image', '', 'SAFEPATH');
$rev = min_optional_param('rev', -1, 'INT');
if (empty($component) or empty($image)) {
image_not_found();
}
if (file_exists("$CFG->dirroot/theme/$themename/config.php")) {
// exists
} else if (!empty($CFG->themedir) and file_exists("$CFG->themedir/$themename/config.php")) {
// exists
} else {
image_not_found();
}
$candidatelocation = "$CFG->cachedir/theme/$themename/pix/$component";
if ($rev > -1) {
if (file_exists("$candidatelocation/$image.error")) {
// this is a major speedup if there are multiple missing images,
// the only problem is that random requests may pollute our cache.
image_not_found();
}
$cacheimage = false;
if (file_exists("$candidatelocation/$image.gif")) {
$cacheimage = "$candidatelocation/$image.gif";
$ext = 'gif';
} else if (file_exists("$candidatelocation/$image.png")) {
$cacheimage = "$candidatelocation/$image.png";
$ext = 'png';
} else if (file_exists("$candidatelocation/$image.jpg")) {
$cacheimage = "$candidatelocation/$image.jpg";
$ext = 'jpg';
} else if (file_exists("$candidatelocation/$image.jpeg")) {
$cacheimage = "$candidatelocation/$image.jpeg";
$ext = 'jpeg';
} else if (file_exists("$candidatelocation/$image.ico")) {
$cacheimage = "$candidatelocation/$image.ico";
$ext = 'ico';
}
if ($cacheimage) {
if (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
// we do not actually need to verify the etag value because our files
// never change in cache because we increment the rev parameter
$lifetime = 60*60*24*30; // 30 days
$mimetype = get_contenttype_from_ext($ext);
header('HTTP/1.1 304 Not Modified');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Cache-Control: max-age='.$lifetime);
header('Content-Type: '.$mimetype);
die;
}
send_cached_image($cacheimage, $rev);
}
}
//=================================================================================
// ok, now we need to start normal moodle script, we need to load all libs and $DB
define('ABORT_AFTER_CONFIG_CANCEL', true);
define('NO_MOODLE_COOKIES', true); // Session not used here
define('NO_UPGRADE_CHECK', true); // Ignore upgrade check
require("$CFG->dirroot/lib/setup.php");
$theme = theme_config::load($themename);
$imagefile = $theme->resolve_image_location($image, $component);
$rev = theme_get_revision();
if (empty($imagefile) or !is_readable($imagefile)) {
if ($rev > -1) {
// make note we can not find this file
$cacheimage = "$candidatelocation/$image.error";
$fp = fopen($cacheimage, 'w');
fclose($fp);
}
image_not_found();
}
if ($rev > -1) {
$pathinfo = pathinfo($imagefile);
$cacheimage = "$candidatelocation/$image.".$pathinfo['extension'];
if (!file_exists($cacheimage)) {
// note: cache reset might have purged our cache dir structure,
// make sure we do not use stale file stat cache in the next check_dir_exists()
clearstatcache();
check_dir_exists(dirname($cacheimage));
copy($imagefile, $cacheimage);
}
send_cached_image($cacheimage, $rev);
} else {
send_uncached_image($imagefile);
}
//=================================================================================
//=== utility functions ==
// we are not using filelib because we need to fine tune all header
// parameters to get the best performance.
function send_cached_image($imagepath, $rev) {
$lifetime = 60*60*24*30; // 30 days
$pathinfo = pathinfo($imagepath);
$imagename = $pathinfo['filename'].'.'.$pathinfo['extension'];
$mimetype = get_contenttype_from_ext($pathinfo['extension']);
header('Etag: '.md5("$rev/$imagepath"));
header('Content-Disposition: inline; filename="'.$imagename.'"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: max-age='.$lifetime);
header('Accept-Ranges: none');
header('Content-Type: '.$mimetype);
header('Content-Length: '.filesize($imagepath));
// no need to gzip already compressed images ;-)
readfile($imagepath);
die;
}
function send_uncached_image($imagepath) {
$pathinfo = pathinfo($imagepath);
$imagename = $pathinfo['filename'].'.'.$pathinfo['extension'];
$mimetype = get_contenttype_from_ext($pathinfo['extension']);
header('Content-Disposition: inline; filename="'.$imagename.'"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + 15) .' GMT');
header('Pragma: ');
header('Accept-Ranges: none');
header('Content-Type: '.$mimetype);
header('Content-Length: '.filesize($imagepath));
readfile($imagepath);
die;
}
function image_not_found() {
header('HTTP/1.0 404 not found');
die('Image was not found, sorry.');
}
function get_contenttype_from_ext($ext) {
switch ($ext) {
case 'gif':
return 'image/gif';
case 'png':
return 'image/png';
case 'jpg':
case 'jpeg':
return 'image/jpeg';
case 'ico':
return 'image/vnd.microsoft.icon';
}
return 'document/unknown';
}