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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 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
// get special url parameters
list($parts, $slasharguments) = combo_params();
if (!$parts) {
combo_not_found();
}
$etag = sha1($parts);
$parts = trim($parts, '&');
// find out what we are serving - only one type per request
$content = '';
if (substr($parts, -3) === '.js') {
$mimetype = 'application/javascript';
} else if (substr($parts, -4) === '.css') {
$mimetype = 'text/css';
} else {
combo_not_found();
}
// if they are requesting a revision that's not -1, and they have supplied an
// If-Modified-Since header, we can send back a 304 Not Modified since the
// content never changes (the rev number is increased any time the content changes)
if (strpos($parts, '/-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('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Cache-Control: public, max-age='.$lifetime);
header('Content-Type: '.$mimetype);
header('Etag: "'.$etag.'"');
die;
}
$parts = explode('&', $parts);
$cache = true;
$lastmodified = 0;
foreach ($parts as $part) {
if (empty($part)) {
continue;
}
$part = min_clean_param($part, 'SAFEPATH');
$bits = explode('/', $part);
if (count($bits) < 2) {
$content .= "\n// Wrong combo resource $part!\n";
continue;
}
//debug($bits);
$version = array_shift($bits);
if ($version == 'moodle') {
//TODO: this is a ugly hack because we should not load any libs here!
if (!defined('MOODLE_INTERNAL')) {
define('MOODLE_INTERNAL', true);
require_once($CFG->libdir.'/moodlelib.php');
}
$revision = (int)array_shift($bits);
if ($revision === -1) {
// Revision -1 says please don't cache the JS
$cache = false;
}
$frankenstyle = array_shift($bits);
$filename = array_pop($bits);
$dir = get_component_directory($frankenstyle);
if ($mimetype == 'text/css') {
$bits[] = 'assets';
$bits[] = 'skins';
$bits[] = 'sam';
}
$contentfile = $dir.'/yui/'.join('/', $bits).'/'.$filename;
} else {
if ($version != $CFG->yui3version and $version != $CFG->yui2version and $version != 'gallery') {
$content .= "\n// Wrong yui version $part!\n";
continue;
}
$contentfile = "$CFG->libdir/yui/$part";
}
if (!file_exists($contentfile) or !is_file($contentfile)) {
$location = '$CFG->dirroot'.preg_replace('/^'.preg_quote($CFG->dirroot, '/').'/', '', $contentfile);
$content .= "\n// Combo resource $part ($location) not found!\n";
continue;
}
$filecontent = file_get_contents($contentfile);
$fmodified = filemtime($contentfile);
if ($fmodified > $lastmodified) {
$lastmodified = $fmodified;
}
$relroot = preg_replace('|^http.?://[^/]+|', '', $CFG->wwwroot);
$sep = ($slasharguments ? '/' : '?file=');
if ($mimetype === 'text/css') {
if ($version == 'moodle') {
$filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/'.$frankenstyle.'/'.array_shift($bits).'/$1.$2', $filecontent);
} else if ($version == 'gallery') {
// search for all images in gallery module CSS and serve them through the yui_image.php script
$filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/'.$bits[0].'/'.$bits[1].'/$1.$2', $filecontent);
} else {
// First we need to remove relative paths to images. These are used by YUI modules to make use of global assets.
// I've added this as a separate regex so it can be easily removed once
// YUI standardise there CSS methods
$filecontent = preg_replace('#(\.\./\.\./\.\./\.\./assets/skins/sam/)?([a-z0-9_-]+)\.(png|gif)#', '$2.$3', $filecontent);
// search for all images in yui2 CSS and serve them through the yui_image.php script
$filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot.'/theme/yui_image.php'.$sep.$version.'/$1.$2', $filecontent);
}
}
$content .= $filecontent;
}
if ($lastmodified == 0) {
$lastmodified = time();
}
if ($cache) {
combo_send_cached($content, $mimetype, $etag, $lastmodified);
} else {
combo_send_uncached($content, $mimetype);
}
/**
* Send the JavaScript cached
* @param string $content
* @param string $mimetype
* @param string $etag
* @param int $lastmodified
*/
function combo_send_cached($content, $mimetype, $etag, $lastmodified) {
$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="combo"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime);
header('Accept-Ranges: none');
header('Content-Type: '.$mimetype);
header('Etag: "'.$etag.'"');
if (!min_enable_zlib_compression()) {
header('Content-Length: '.strlen($content));
}
echo $content;
die;
}
/**
* Send the JavaScript uncached
* @param string $content
* @param string $mimetype
*/
function combo_send_uncached($content, $mimetype) {
header('Content-Disposition: inline; filename="combo"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + 2) .' GMT');
header('Pragma: ');
header('Accept-Ranges: none');
header('Content-Type: '.$mimetype);
if (!min_enable_zlib_compression()) {
header('Content-Length: '.strlen($content));
}
echo $content;
die;
}
function combo_not_found($message = '') {
header('HTTP/1.0 404 not found');
if ($message) {
echo $message;
} else {
echo 'Combo resource not found, sorry.';
}
die;
}
function combo_params() {
if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], 'file=/') === 0) {
// url rewriting
$slashargument = substr($_SERVER['QUERY_STRING'], 6);
return array($slashargument, true);
} else if (isset($_SERVER['REQUEST_URI']) and strpos($_SERVER['REQUEST_URI'], '?') !== false) {
$parts = explode('?', $_SERVER['REQUEST_URI'], 2);
return array($parts[1], false);
} else if (isset($_SERVER['QUERY_STRING']) and strpos($_SERVER['QUERY_STRING'], '?') !== false) {
// note: buggy or misconfigured IIS does return the query string in REQUEST_URI
return array($_SERVER['QUERY_STRING'], false);
} else if ($slashargument = min_get_slash_argument()) {
$slashargument = ltrim($slashargument, '/');
return array($slashargument, true);
} else {
// unsupported server, sorry!
combo_not_found('Unsupported server - query string can not be determined, try disabling YUI combo loading in admin settings.');
}
}
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