<?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',

);

// 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 (!min_is_revision_valid_and_current($revision)) {

// A non-current revision means please don't cache the JS

$revision = -1;

$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 (!min_is_revision_valid_and_current($revision)) {

// A non-current revision means please don't cache the JS

$revision = -1;

$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) {

}

/**

* Send the JavaScript uncached

* @param string $content

* @param string $mimetype

*/

function combo_send_uncached($content, $mimetype) {

}

function combo_not_found($message = '') {

}

function combo_params() {

}