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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 contains various javascript related functions,
* all functions here are self contained and can be used in ABORT_AFTER_CONFIG scripts.
*
* @package core_lib
* @copyright 2012 Petr Skoda (skodak) {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Send javascript file content with as much caching as possible
* @param string $jspath
* @param string $etag
* @param string $filename
*/
function js_send_cached($jspath, $etag, $filename = 'javascript.php') {
require(__DIR__ . '/xsendfilelib.php');
// 90 days only - based on Moodle point release cadence being every 3 months.
$lifetime = 60 * 60 * 24 * 90;
header('Etag: "'.$etag.'"');
header('Content-Disposition: inline; filename="'.$filename.'"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($jspath)) .' 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: application/javascript; charset=utf-8');
if (xsendfile($jspath)) {
die;
}
if (!min_enable_zlib_compression()) {
header('Content-Length: '.filesize($jspath));
}
readfile($jspath);
die;
}
/**
* Send javascript without any caching
* @param string $js
* @param string $filename
*/
function js_send_uncached($js, $filename = 'javascript.php') {
header('Content-Disposition: inline; filename="'.$filename.'"');
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: application/javascript; charset=utf-8');
header('Content-Length: '.strlen($js));
echo $js;
die;
}
/**
* Send file not modified headers
* @param int $lastmodified
* @param string $etag
*/
function js_send_unmodified($lastmodified, $etag) {
// 90 days only - based on Moodle point release cadence being every 3 months.
$lifetime = 60 * 60 * 24 * 90;
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: application/javascript; charset=utf-8');
header('Etag: "'.$etag.'"');
if ($lastmodified) {
header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
}
die;
}
/**
* Create cache file for JS content
* @param string $file full file path to cache file
* @param string $content JS code
*/
function js_write_cache_file_content($file, $content) {
global $CFG;
clearstatcache();
if (!file_exists(dirname($file))) {
@mkdir(dirname($file), $CFG->directorypermissions, true);
}
// Prevent serving of incomplete file from concurrent request,
// the rename() should be more atomic than fwrite().
ignore_user_abort(true);
if ($fp = fopen($file.'.tmp', 'xb')) {
fwrite($fp, $content);
fclose($fp);
rename($file.'.tmp', $file);
@chmod($file, $CFG->filepermissions);
@unlink($file.'.tmp'); // just in case anything fails
}
ignore_user_abort(false);
if (connection_aborted()) {
die;
}
}
/**
* Sends a 404 message about CSS not being found.
*/
function js_send_css_not_found() {
header('HTTP/1.0 404 not found');
die('JS was not found, sorry.');
}