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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 is responsible for serving the fonts used in CSS.
- *
- * Note: it is recommended to use only WOFF (Web Open Font Format) fonts.
- *
- * @package core
- * @copyright 2013 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);
- define('ABORT_AFTER_CONFIG', true);
- require('../config.php');
- if ($slashargument = min_get_slash_argument()) {
- $slashargument = ltrim($slashargument, '/');
- if (substr_count($slashargument, '/') < 3) {
- font_not_found();
- }
- list($themename, $component, $rev, $font) = explode('/', $slashargument, 4);
- $themename = min_clean_param($themename, 'SAFEDIR');
- $component = min_clean_param($component, 'SAFEDIR');
- $rev = min_clean_param($rev, 'INT');
- $font = min_clean_param($font, 'RAW');
- } else {
- $themename = min_optional_param('theme', 'standard', 'SAFEDIR');
- $component = min_optional_param('component', 'core', 'SAFEDIR');
- $rev = min_optional_param('rev', -1, 'INT');
- $font = min_optional_param('font', '', 'RAW');
- }
- if (!$font) {
- font_not_found();
- }
- if (empty($component) or $component === 'moodle' or $component === 'core') {
- $component = 'core';
- }
- if (preg_match('/^[a-z0-9_-]+\.woff2$/i', $font, $matches)) {
- $font = $matches[0];
- $mimetype = 'application/font-woff2';
- } else if (preg_match('/^[a-z0-9_-]+\.woff$/i', $font, $matches)) {
- // This is the real standard!
- $font = $matches[0];
- $mimetype = 'application/font-woff';
- } else if (preg_match('/^[a-z0-9_-]+\.ttf$/i', $font, $matches)) {
- $font = $matches[0];
- $mimetype = 'application/x-font-ttf';
- } else if (preg_match('/^[a-z0-9_-]+\.otf$/i', $font, $matches)) {
- $font = $matches[0];
- $mimetype = 'application/x-font-opentype';
- } else if (preg_match('/^[a-z0-9_-]+\.eot$/i', $font, $matches)) {
- // IE8 must die!!!
- $font = $matches[0];
- $mimetype = 'application/vnd.ms-fontobject';
- } else if (preg_match('/^[a-z0-9_-]+\.svg$/i', $font, $matches)) {
- $font = $matches[0];
- $mimetype = 'image/svg+xml';
- } else {
- font_not_found();
- }
- if (file_exists("$CFG->dirroot/theme/$themename/config.php")) {
- // Normal theme exists.
- } else if (!empty($CFG->themedir) and file_exists("$CFG->themedir/$themename/config.php")) {
- // Theme exists in alternative location.
- } else {
- font_not_found();
- }
- $candidatelocation = "$CFG->localcachedir/theme/$rev/$themename/fonts/$component";
- $etag = sha1("$rev/$themename/$component/$font");
- if ($rev > 0) {
- if (file_exists("$candidatelocation/$font.error")) {
- font_not_found();
- }
- if (file_exists("$candidatelocation/$font")) {
- if (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
- // We do not actually need to verify the etag value because our files
- // never change in cache because we increment the rev parameter.
- $lifetime = 60*60*24*60; // 60 days only - the revision may get incremented quite often.
- 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;
- }
- send_cached_font("$candidatelocation/$font", $etag, $font, $mimetype);
- }
- }
- // Ok, now we need to start normal moodle script, we need to load all libs and $DB.
- define('ABORT_AFTER_CONFIG_CANCEL', true);
- define('NO_MOODLE_COOKIES', true); // Session not used here.
- define('NO_UPGRADE_CHECK', true); // Ignore upgrade check.
- require("$CFG->dirroot/lib/setup.php");
- $theme = theme_config::load($themename);
- $themerev = theme_get_revision();
- $fontfile = $theme->resolve_font_location($font, $component);
- if ($themerev <= 0 or $rev != $themerev) {
- // Do not send caching headers if they do not request current revision,
- // we do not want to pollute browser caches with outdated fonts.
- if (empty($fontfile) or !is_readable($fontfile)) {
- font_not_found();
- }
- send_uncached_font($fontfile, $font, $mimetype);
- }
- make_localcache_directory('theme', false);
- if (empty($fontfile) or !is_readable($fontfile)) {
- if (!file_exists($candidatelocation)) {
- @mkdir($candidatelocation, $CFG->directorypermissions, true);
- }
- // Make note we can not find this file.
- $cachefont = "$candidatelocation/$font.error";
- $fp = fopen($cachefont, 'w');
- fclose($fp);
- font_not_found();
- }
- $cachefont = cache_font($font, $fontfile, $candidatelocation);
- if (connection_aborted()) {
- die;
- }
- // Make sure nothing failed.
- clearstatcache();
- if (file_exists($cachefont)) {
- send_cached_font($cachefont, $etag, $font, $mimetype);
- }
- send_uncached_font($fontfile, $font, $mimetype);
- // Utility functions.
- function send_cached_font($fontpath, $etag, $font, $mimetype) {
- global $CFG;
- require("$CFG->dirroot/lib/xsendfilelib.php");
- $lifetime = 60*60*24*60; // 60 days only - the revision may get incremented quite often.
- header('Etag: "'.$etag.'"');
- header('Content-Disposition: inline; filename="'.$font.'"');
- header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($fontpath)) .' GMT');
- header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
- header('Pragma: ');
- header('Cache-Control: public, max-age='.$lifetime);
- header('Accept-Ranges: none');
- header('Content-Type: '.$mimetype);
- header('Content-Length: '.filesize($fontpath));
- if (xsendfile($fontpath)) {
- die;
- }
- // No need to gzip already compressed fonts.
- readfile($fontpath);
- die;
- }
- function send_uncached_font($fontpath, $font, $mimetype) {
- header('Content-Disposition: inline; filename="'.$font.'"');
- header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
- header('Expires: '. gmdate('D, d M Y H:i:s', time() + 15) .' GMT');
- header('Pragma: ');
- header('Accept-Ranges: none');
- header('Content-Type: '.$mimetype);
- header('Content-Length: '.filesize($fontpath));
- readfile($fontpath);
- die;
- }
- function font_not_found() {
- header('HTTP/1.0 404 not found');
- die('font was not found, sorry.');
- }
- /**
- * Caches a given font file.
- *
- * @param string $font The name of the font that was requested.
- * @param string $fontfile The location of the font file we want to cache.
- * @param string $candidatelocation The location to cache it in.
- * @return string The path to the cached font.
- */
- function cache_font($font, $fontfile, $candidatelocation) {
- global $CFG;
- $cachefont = "$candidatelocation/$font";
- clearstatcache();
- if (!file_exists($candidatelocation)) {
- @mkdir($candidatelocation, $CFG->directorypermissions, true);
- }
- // Prevent serving of incomplete file from concurrent request,
- // the rename() should be more atomic than copy().
- ignore_user_abort(true);
- if (@copy($fontfile, $cachefont.'.tmp')) {
- rename($cachefont.'.tmp', $cachefont);
- @chmod($cachefont, $CFG->filepermissions);
- @unlink($cachefont.'.tmp'); // Just in case anything fails.
- }
- return $cachefont;
- }
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