Proyectos de Subversion Moodle

<?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) {

    $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.');

    }

}