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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 ($to = strpos($font, '?')) {
$font = substr($font, 0, $to);
}
if (empty($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.
// 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: '.$mimetype);
header('Etag: "'.$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");
// 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="'.$font.'"');
header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($fontpath)) .' GMT');
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
header('Cache-Control: public, max-age='.$lifetime.', immutable');
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;
}