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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 is responsible for serving the fonts used in CSS.
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*
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* Note: it is recommended to use only WOFF2 (Web Open Font Format v2) fonts.
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*
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* @package core
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* @copyright 2013 Petr Skoda (skodak) {@link http://skodak.org}
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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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// Disable moodle specific debug messages and any errors in output,
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// comment out when debugging or better look into error log!
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define('NO_DEBUG_DISPLAY', true);
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define('ABORT_AFTER_CONFIG', true);
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require('../config.php');
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if ($slashargument = min_get_slash_argument()) {
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$slashargument = ltrim($slashargument, '/');
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if (substr_count($slashargument, '/') < 3) {
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font_not_found();
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}
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list($themename, $component, $rev, $font) = explode('/', $slashargument, 4);
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$themename = min_clean_param($themename, 'SAFEDIR');
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$component = min_clean_param($component, 'SAFEDIR');
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$rev = min_clean_param($rev, 'INT');
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$font = min_clean_param($font, 'RAW');
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} else {
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$themename = min_optional_param('theme', 'standard', 'SAFEDIR');
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$component = min_optional_param('component', 'core', 'SAFEDIR');
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$rev = min_optional_param('rev', -1, 'INT');
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$font = min_optional_param('font', '', 'RAW');
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}
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if (!min_is_revision_valid_and_current($rev)) {
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// If the rev is invalid, normalise it to -1 to disable all caching.
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$rev = -1;
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}
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if (!$font) {
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font_not_found();
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}
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if ($to = strpos($font, '?')) {
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$font = substr($font, 0, $to);
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}
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if (empty($component) or $component === 'moodle' or $component === 'core') {
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$component = 'core';
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}
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if (preg_match('/^[a-z0-9_-]+\.woff2$/i', $font, $matches)) {
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$font = $matches[0];
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$mimetype = 'font/woff2';
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} else if (preg_match('/^[a-z0-9_-]+\.woff$/i', $font, $matches)) {
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// This is the real standard!
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$font = $matches[0];
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$mimetype = 'font/woff';
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} else if (preg_match('/^[a-z0-9_-]+\.ttf$/i', $font, $matches)) {
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$font = $matches[0];
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$mimetype = 'font/ttf';
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} else if (preg_match('/^[a-z0-9_-]+\.otf$/i', $font, $matches)) {
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$font = $matches[0];
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$mimetype = 'font/otf';
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} else if (preg_match('/^[a-z0-9_-]+\.eot$/i', $font, $matches)) {
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// IE8 must die!!!
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$font = $matches[0];
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$mimetype = 'application/vnd.ms-fontobject';
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} else if (preg_match('/^[a-z0-9_-]+\.svg$/i', $font, $matches)) {
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$font = $matches[0];
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$mimetype = 'image/svg+xml';
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} else {
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font_not_found();
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}
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if (file_exists("$CFG->dirroot/theme/$themename/config.php")) {
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// Normal theme exists.
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} else if (!empty($CFG->themedir) and file_exists("$CFG->themedir/$themename/config.php")) {
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// Theme exists in alternative location.
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} else {
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font_not_found();
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}
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$candidatelocation = "$CFG->localcachedir/theme/$rev/$themename/fonts/$component";
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$etag = sha1("$rev/$themename/$component/$font");
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if ($rev > 0) {
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if (file_exists("$candidatelocation/$font.error")) {
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font_not_found();
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}
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if (file_exists("$candidatelocation/$font")) {
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if (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
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// We do not actually need to verify the etag value because our files
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// never change in cache because we increment the rev parameter.
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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: '.$mimetype);
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header('Etag: "'.$etag.'"');
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die;
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}
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send_cached_font("$candidatelocation/$font", $etag, $font, $mimetype);
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}
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}
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// Ok, now we need to start normal moodle script, we need to load all libs and $DB.
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define('ABORT_AFTER_CONFIG_CANCEL', true);
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define('NO_MOODLE_COOKIES', true); // Session not used here.
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define('NO_UPGRADE_CHECK', true); // Ignore upgrade check.
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require("$CFG->dirroot/lib/setup.php");
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$theme = theme_config::load($themename);
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$themerev = theme_get_revision();
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$fontfile = $theme->resolve_font_location($font, $component);
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if ($themerev <= 0 or $rev != $themerev) {
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// Do not send caching headers if they do not request current revision,
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// we do not want to pollute browser caches with outdated fonts.
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if (empty($fontfile) or !is_readable($fontfile)) {
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font_not_found();
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}
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send_uncached_font($fontfile, $font, $mimetype);
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}
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make_localcache_directory('theme', false);
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if (empty($fontfile) or !is_readable($fontfile)) {
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if (!file_exists($candidatelocation)) {
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@mkdir($candidatelocation, $CFG->directorypermissions, true);
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}
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// Make note we can not find this file.
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$cachefont = "$candidatelocation/$font.error";
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$fp = fopen($cachefont, 'w');
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fclose($fp);
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font_not_found();
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}
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$cachefont = cache_font($font, $fontfile, $candidatelocation);
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if (connection_aborted()) {
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die;
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}
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// Make sure nothing failed.
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clearstatcache();
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if (file_exists($cachefont)) {
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send_cached_font($cachefont, $etag, $font, $mimetype);
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}
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send_uncached_font($fontfile, $font, $mimetype);
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// Utility functions.
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function send_cached_font($fontpath, $etag, $font, $mimetype) {
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global $CFG;
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require("$CFG->dirroot/lib/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="'.$font.'"');
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header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($fontpath)) .' 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: '.$mimetype);
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header('Content-Length: '.filesize($fontpath));
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if (xsendfile($fontpath)) {
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die;
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}
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// No need to gzip already compressed fonts.
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readfile($fontpath);
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die;
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}
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function send_uncached_font($fontpath, $font, $mimetype) {
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header('Content-Disposition: inline; filename="'.$font.'"');
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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() + 15) .' GMT');
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header('Pragma: ');
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header('Accept-Ranges: none');
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header('Content-Type: '.$mimetype);
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header('Content-Length: '.filesize($fontpath));
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readfile($fontpath);
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die;
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}
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function font_not_found() {
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header('HTTP/1.0 404 not found');
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die('font was not found, sorry.');
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}
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/**
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* Caches a given font file.
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*
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* @param string $font The name of the font that was requested.
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* @param string $fontfile The location of the font file we want to cache.
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* @param string $candidatelocation The location to cache it in.
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* @return string The path to the cached font.
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*/
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function cache_font($font, $fontfile, $candidatelocation) {
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global $CFG;
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$cachefont = "$candidatelocation/$font";
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clearstatcache();
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if (!file_exists($candidatelocation)) {
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@mkdir($candidatelocation, $CFG->directorypermissions, true);
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}
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// Prevent serving of incomplete file from concurrent request,
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// the rename() should be more atomic than copy().
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ignore_user_abort(true);
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if (@copy($fontfile, $cachefont.'.tmp')) {
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rename($cachefont.'.tmp', $cachefont);
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@chmod($cachefont, $CFG->filepermissions);
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@unlink($cachefont.'.tmp'); // Just in case anything fails.
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}
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return $cachefont;
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}
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