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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 Javascript and CSS
*
* @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
// get special url parameters
list($parts, $slasharguments) = combo_params();
if (!$parts) {
combo_not_found();
}
$parts = trim($parts, '&');
// Remove any duplicate parts, since each file only needs to be loaded once (which also helps reduce total file size).
$parts = implode('&', array_unique(explode('&', $parts)));
// Limit length of parts to match the YUI loader limit of 1024, to prevent loading an arbitrary number of files.
if (strlen($parts) > 1024) {
$parts = substr($parts, 0, 1024);
// If the shortened $parts has been cut off mid-way through a filename, trim back to the end of the previous filename.
if (substr($parts, -3) !== '.js' && substr($parts, -4) !== '.css') {
$parts = substr($parts, 0, strrpos($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();
}
$etag = sha1($parts);
// 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;
$lastmodified = 0;
while (count($parts)) {
$part = array_shift($parts);
if (empty($part)) {
continue;
}
$filecontent = '';
$part = min_clean_param($part, 'SAFEPATH');
$bits = explode('/', $part);
if (count($bits) < 2) {
$content .= "\n// Wrong combo resource $part!\n";
continue;
}
$version = array_shift($bits);
if ($version === 'rollup') {
$yuipatchedversion = explode('_', array_shift($bits));
$revision = $yuipatchedversion[0];
$rollupname = array_shift($bits);
if (strpos($rollupname, 'yui-moodlesimple') !== false) {
if (substr($rollupname, -3) === '.js') {
// Determine which version of this rollup should be used.
$filesuffix = '.js';
preg_match('/(-(debug|min))?\.js/', $rollupname, $matches);
if (isset($matches[1])) {
$filesuffix = $matches[0];
}
$type = 'js';
} else if (substr($rollupname, -4) === '.css') {
$type = 'css';
} else {
continue;
}
// 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('_', $revision);
$yuiversion = $yuipatchedversion[0];
$yuimodules = array(
'yui',
'oop',
'event-custom-base',
'dom-core',
'dom-base',
'color-base',
'dom-style',
'selector-native',
'selector',
'node-core',
'node-base',
'event-base',
'event-base-ie',
'pluginhost-base',
'pluginhost-config',
'event-delegate',
'node-event-delegate',
'node-pluginhost',
'dom-screen',
'node-screen',
'node-style',
'querystring-stringify-simple',
'io-base',
'json-parse',
'transition',
'selector-css2',
'selector-css3',
'dom-style-ie',
// Some extras we use everywhere.
'escape',
'attribute-core',
'event-custom-complex',
'base-core',
'attribute-base',
'attribute-extras',
'attribute-observable',
'base-observable',
'base-base',
'base-pluginhost',
'base-build',
'event-synthetic',
'attribute-complex',
'event-mouseenter',
'event-key',
'event-outside',
'event-focus',
'classnamemanager',
'widget-base',
'widget-htmlparser',
'widget-skin',
'widget-uievents',
'widget-stdmod',
'widget-position',
'widget-position-align',
'widget-stack',
'widget-position-constrain',
'overlay',
'widget-autohide',
'button-core',
'button-plugin',
'widget-buttons',
'widget-modality',
'panel',
'yui-throttle',
'dd-ddm-base',
'dd-drag',
'dd-plugin',
// Cache is used by moodle-core-tooltip which we include everywhere.
'cache-base',
);
// We need to add these new parts to the beginning of the $parts list, not the end.
if ($type === 'js') {
$newparts = array();
foreach ($yuimodules as $module) {
$newparts[] = $yuiversion . '/' . $module . '/' . $module . $filesuffix;
}
$newparts[] = 'yuiuseall/yuiuseall';
$parts = array_merge($newparts, $parts);
} else {
$newparts = array();
foreach ($yuimodules as $module) {
$candidate = $yuiversion . '/' . $module . '/assets/skins/sam/' . $module . '.css';
if (!file_exists("$CFG->libdir/yuilib/$candidate")) {
continue;
}
$newparts[] = $candidate;
}
if ($newparts) {
$parts = array_merge($newparts, $parts);
}
}
}
continue;
}
if ($version === 'm') {
$version = 'moodle';
}
if ($version === 'moodle') {
if (count($bits) <= 3) {
// This is an invalid module load attempt.
$content .= "\n// Incorrect moodle module inclusion. Not enough component information in {$part}.\n";
continue;
}
$revision = (int)array_shift($bits);
if ($revision === -1) {
// Revision -1 says please don't cache the JS
$cache = false;
}
$frankenstyle = array_shift($bits);
$filename = array_pop($bits);
$modulename = $bits[0];
$dir = core_component::get_component_directory($frankenstyle);
// For shifted YUI modules, we need the YUI module name in frankenstyle format.
$frankenstylemodulename = join('-', array($version, $frankenstyle, $modulename));
$frankenstylefilename = preg_replace('/' . $modulename . '/', $frankenstylemodulename, $filename);
// Submodules are stored in a directory with the full submodule name.
// We need to remove the -debug.js, -min.js, and .js from the file name to calculate that directory name.
$frankenstyledirectoryname = str_replace(array('-min.js', '-debug.js', '.js', '.css'), '', $frankenstylefilename);
// By default, try and use the /yui/build directory.
$contentfile = $dir . '/yui/build/' . $frankenstyledirectoryname;
if ($mimetype == 'text/css') {
// CSS assets are in a slightly different place to the JS.
$contentfile = $contentfile . '/assets/skins/sam/' . $frankenstylefilename;
// Add the path to the bits to handle fallback for non-shifted assets.
$bits[] = 'assets';
$bits[] = 'skins';
$bits[] = 'sam';
} else {
$contentfile = $contentfile . '/' . $frankenstylefilename;
}
// If the shifted versions don't exist, fall back to the non-shifted file.
if (!file_exists($contentfile) or !is_file($contentfile)) {
// We have to revert to the non-minified and non-debug versions.
$filename = preg_replace('/-(min|debug)\./', '.', $filename);
$contentfile = $dir . '/yui/' . join('/', $bits) . '/' . $filename;
}
} else if ($version === '2in3') {
$contentfile = "$CFG->libdir/yuilib/$part";
} else if ($version == 'gallery') {
if (count($bits) <= 2) {
// This is an invalid module load attempt.
$content .= "\n// Incorrect moodle module inclusion. Not enough component information in {$part}.\n";
continue;
}
$revision = (int)array_shift($bits);
if ($revision === -1) {
// Revision -1 says please don't cache the JS
$cache = false;
}
$contentfile = "$CFG->libdir/yuilib/gallery/" . join('/', $bits);
} else if ($version == 'yuiuseall') {
// Create global Y that is available in global scope,
// this is the trick behind original SimpleYUI.
$filecontent = "var Y = YUI().use('*');";
} 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 = $yuipatchedversion[0];
if ($yuiversion != $CFG->yui3version) {
$content .= "\n// Wrong yui version $part!\n";
continue;
}
$newpart = explode('/', $part);
$newpart[0] = $yuiversion;
$part = implode('/', $newpart);
$contentfile = "$CFG->libdir/yuilib/$part";
}
if (!file_exists($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;
}
if (empty($filecontent)) {
$filecontent = file_get_contents($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') {
// Search for all images in the file and replace with an appropriate link to the yui_image.php script
$imagebits = array(
$sep . $version,
$frankenstyle,
$modulename,
array_shift($bits),
'$1.$2'
);
$filecontent = preg_replace('/([a-z0-9_-]+)\.(png|gif)/', $relroot . '/theme/yui_image.php' . implode('/', $imagebits), $filecontent);
} else if ($version == '2in3') {
// 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.$CFG->yui2version.'/$1.$2', $filecontent);
} else if ($version == 'gallery') {
// Replace any references to the CDN with a relative link.
$filecontent = preg_replace('#(' . preg_quote('http://yui.yahooapis.com/') . '(gallery-[^/]*/))#', '../../../../', $filecontent);
// Replace all relative image links with the a link to yui_image.php.
$filecontent = preg_replace('#(' . preg_quote('../../../../') . ')(gallery-[^/]*/assets/skins/sam/[a-z0-9_-]+)\.(png|gif)#',
$relroot . '/theme/yui_image.php' . $sep . '/gallery/' . $revision . '/$2.$3', $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.', immutable');
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(false)) {
$slashargument = ltrim($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.');
}
}