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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 of yui images
*
* @package core
* @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
if ($slashargument = min_get_slash_argument()) {
$path = ltrim($slashargument, '/');
} else {
$path = min_optional_param('file', '', 'SAFEPATH');
}
$etag = sha1($path);
$parts = explode('/', $path);
$version = array_shift($parts);
if ($version === 'm') {
$version = 'moodle';
}
if ($version == 'moodle' && count($parts) >= 3) {
$frankenstyle = array_shift($parts);
$module = array_shift($parts);
$image = array_pop($parts);
$subdir = join('/', $parts);
$dir = core_component::get_component_directory($frankenstyle);
// For shifted YUI modules, we need the YUI module name in frankenstyle format.
$frankenstylemodulename = join('-', array($version, $frankenstyle, $module));
// By default, try and use the /yui/build directory.
$imagepath = $dir . '/yui/build/' . $frankenstylemodulename . '/assets/skins/sam/' . $image;
// If the shifted versions don't exist, fall back to the non-shifted file.
if (!file_exists($imagepath) or !is_file($imagepath)) {
$imagepath = $dir . '/yui/' . $module . '/assets/skins/sam/' . $image;
}
} else if ($version == 'gallery' && count($parts) >= 3) {
list($revision, $module, , , , $image) = $parts;
$imagepath = "$CFG->dirroot/lib/yuilib/gallery/$module/assets/skins/sam/$image";
} else {
// Allow support for revisions on YUI between official releases.
// We can just discard the subrevision since it is only used to invalidate the browser cache.
$yuipatchedversion = explode('_', $version);
$yuiversion = $yuipatchedversion[0];
if (count($parts) == 1 && ($yuiversion == $CFG->yui3version || $yuiversion == $CFG->yui2version)) {
list($image) = $parts;
if ($yuiversion == $CFG->yui3version) {
$imagepath = "$CFG->dirroot/lib/yuilib/$CFG->yui3version/assets/skins/sam/$image";
} else {
$imagepath = "$CFG->dirroot/lib/yuilib/2in3/$CFG->yui2version/build/assets/skins/sam/$image";
}
} else {
yui_image_not_found();
}
}
if (!file_exists($imagepath)) {
yui_image_not_found();
}
$pathinfo = pathinfo($imagepath);
$imagename = $pathinfo['filename'].'.'.$pathinfo['extension'];
switch($pathinfo['extension']) {
case 'gif' : $mimetype = 'image/gif'; break;
case 'png' : $mimetype = 'image/png'; break;
case 'jpg' : $mimetype = 'image/jpeg'; break;
case 'jpeg' : $mimetype = 'image/jpeg'; break;
case 'ico' : $mimetype = 'image/vnd.microsoft.icon'; break;
default: $mimetype = 'document/unknown';
}
// if they are requesting a revision that's not -1, and they have supplied an
// If-Modified-Since header, we can send back a 304 Not Modified since the
// content never changes (the rev number is increased any time the content changes)
if (strpos($path, '/-1/') === false and (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']))) {
$lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
header('HTTP/1.1 304 Not Modified');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Cache-Control: public, max-age='.$lifetime.', no-transform');
header('Content-Type: '.$mimetype);
header('Etag: "'.$etag.'"');
die;
}
yui_image_cached($imagepath, $imagename, $mimetype, $etag);
function yui_image_cached($imagepath, $imagename, $mimetype, $etag) {
global $CFG;
require("$CFG->dirroot/lib/xsendfilelib.php");
$lifetime = 60*60*24*360; // 1 year, we do not change YUI versions often, there are a few custom yui modules
header('Content-Disposition: inline; filename="'.$imagename.'"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($imagepath)) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime.', no-transform, immutable');
header('Accept-Ranges: none');
header('Content-Type: '.$mimetype);
header('Content-Length: '.filesize($imagepath));
header('Etag: "'.$etag.'"');
if (xsendfile($imagepath)) {
die;
}
// no need to gzip already compressed images ;-)
readfile($imagepath);
die;
}
function yui_image_not_found() {
header('HTTP/1.0 404 not found');
die('Image was not found, sorry.');
}