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efrain |
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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* This file contains various Web Assembly related functions,
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* all functions here are self-contained and can be used in ABORT_AFTER_CONFIG scripts.
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*
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* @package core_lib
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* @copyright 2021 Huong Nguyen <huongnv13@gmail.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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/**
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* Send Web Assembly file content with as much caching as possible
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*
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* @param string $wasmpath Path to Web Assembly file
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* @param string $etag Etag
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* @param string $filename File name to be served
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*/
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function wasm_send_cached(string $wasmpath, string $etag, string $filename = 'wasm.php'): void {
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require(__DIR__ . '/xsendfilelib.php');
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// 90 days only - based on Moodle point release cadence being every 3 months.
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$lifetime = 60 * 60 * 24 * 90;
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header('Etag: "' . $etag . '"');
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header('Content-Disposition: inline; filename="' . $filename . '"');
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime($wasmpath)) . ' GMT');
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $lifetime) . ' GMT');
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header('Pragma: ');
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header('Cache-Control: public, max-age=' . $lifetime . ', immutable');
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header('Accept-Ranges: none');
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header('Content-Type: application/wasm');
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if (xsendfile($wasmpath)) {
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die;
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}
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if (!min_enable_zlib_compression()) {
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header('Content-Length: ' . filesize($wasmpath));
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}
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readfile($wasmpath);
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die;
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}
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/**
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* Send Web Assembly file without any caching
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*
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* @param string $wasm Web Assembly file content
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* @param string $filename File name to be served
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*/
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function wasm_send_uncached(string $wasm, string $filename = 'wasm.php'): void {
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header('Content-Disposition: inline; filename="' . $filename . '"');
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 2) . ' GMT');
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header('Pragma: ');
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header('Accept-Ranges: none');
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header('Content-Type: application/wasm');
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header('Content-Length: ' . strlen($wasm));
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echo $wasm;
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die;
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}
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/**
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* Send Web Assembly file not modified headers
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*
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* @param int $lastmodified Last modified timestamp
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* @param string $etag Etag
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*/
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function wasm_send_unmodified(int $lastmodified, string $etag): void {
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// 90 days only - based on Moodle point release cadence being every 3 months.
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$lifetime = 60 * 60 * 24 * 90;
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header('HTTP/1.1 304 Not Modified');
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $lifetime) . ' GMT');
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header('Cache-Control: public, max-age=' . $lifetime);
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header('Content-Type: application/wasm');
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header('Etag: "' . $etag . '"');
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if ($lastmodified) {
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $lastmodified) . ' GMT');
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}
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die;
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}
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/**
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* Create cache file for Web Assembly content
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*
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* @param string $file full file path to cache file
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* @param string $content Web Assembly content
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*/
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function wasm_write_cache_file_content(string $file, string $content): void {
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global $CFG;
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clearstatcache();
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if (!file_exists(dirname($file))) {
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@mkdir(dirname($file), $CFG->directorypermissions, true);
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}
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// Prevent serving of incomplete file from concurrent request,
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// the rename() should be more atomic than fwrite().
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ignore_user_abort(true);
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if ($fp = fopen($file . '.tmp', 'xb')) {
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fwrite($fp, $content);
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fclose($fp);
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rename($file . '.tmp', $file);
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@chmod($file, $CFG->filepermissions);
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@unlink($file . '.tmp'); // Just in case anything fails.
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}
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ignore_user_abort(false);
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if (connection_aborted()) {
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die;
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}
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}
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