theme/font.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * This file is responsible for serving the fonts used in CSS.
  19  *
  20  * Note: it is recommended to use only WOFF (Web Open Font Format) fonts.
  21  *
  22  * @package   core
  23  * @copyright 2013 Petr Skoda (skodak)  {@link http://skodak.org}
  24  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 // Disable moodle specific debug messages and any errors in output,
  28 // comment out when debugging or better look into error log!
  29 define('NO_DEBUG_DISPLAY', true);
  30
  31 define('ABORT_AFTER_CONFIG', true);
  32 require('../config.php');
  33
  34 if ($slashargument = min_get_slash_argument()) {
  35     $slashargument = ltrim($slashargument, '/');
  36     if (substr_count($slashargument, '/') < 3) {
  37         font_not_found();
  38     }
  39     list($themename, $component, $rev, $font) = explode('/', $slashargument, 4);
  40     $themename = min_clean_param($themename, 'SAFEDIR');
  41     $component = min_clean_param($component, 'SAFEDIR');
  42     $rev       = min_clean_param($rev, 'INT');
  43     $font      = min_clean_param($font, 'RAW');
  44
  45 } else {
  46     $themename = min_optional_param('theme', 'standard', 'SAFEDIR');
  47     $component = min_optional_param('component', 'core', 'SAFEDIR');
  48     $rev       = min_optional_param('rev', -1, 'INT');
  49     $font      = min_optional_param('font', '', 'RAW');
  50 }
  51
  52 if (!$font) {
  53     font_not_found();
  54 }
  55
  56 if (empty($component) or $component === 'moodle' or $component === 'core') {
  57     $component = 'core';
  58 }
  59
  60 if (preg_match('/^[a-z0-9_-]+\.woff2$/i', $font, $matches)) {
  61     $font = $matches[0];
  62     $mimetype = 'application/font-woff2';
  63
  64 } else if (preg_match('/^[a-z0-9_-]+\.woff$/i', $font, $matches)) {
  65     // This is the real standard!
  66     $font = $matches[0];
  67     $mimetype = 'application/font-woff';
  68
  69 } else if (preg_match('/^[a-z0-9_-]+\.ttf$/i', $font, $matches)) {
  70     $font = $matches[0];
  71     $mimetype = 'application/x-font-ttf';
  72
  73 } else if (preg_match('/^[a-z0-9_-]+\.otf$/i', $font, $matches)) {
  74     $font = $matches[0];
  75     $mimetype = 'application/x-font-opentype';
  76
  77 } else if (preg_match('/^[a-z0-9_-]+\.eot$/i', $font, $matches)) {
  78     // IE8 must die!!!
  79     $font = $matches[0];
  80     $mimetype = 'application/vnd.ms-fontobject';
  81 } else if (preg_match('/^[a-z0-9_-]+\.svg$/i', $font, $matches)) {
  82     $font = $matches[0];
  83     $mimetype = 'image/svg+xml';
  84
  85 } else {
  86     font_not_found();
  87 }
  88
  89 if (file_exists("$CFG->dirroot/theme/$themename/config.php")) {
  90     // Normal theme exists.
  91 } else if (!empty($CFG->themedir) and file_exists("$CFG->themedir/$themename/config.php")) {
  92     // Theme exists in alternative location.
  93 } else {
  94     font_not_found();
  95 }
  96
  97 $candidatelocation = "$CFG->localcachedir/theme/$rev/$themename/fonts/$component";
  98 $etag = sha1("$rev/$themename/$component/$font");
  99
 100 if ($rev > 0) {
 101     if (file_exists("$candidatelocation/$font.error")) {
 102         font_not_found();
 103     }
 104
 105     if (file_exists("$candidatelocation/$font")) {
 106         if (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
 107             // We do not actually need to verify the etag value because our files
 108             // never change in cache because we increment the rev parameter.
 109             $lifetime = 60*60*24*60; // 60 days only - the revision may get incremented quite often.
 110             header('HTTP/1.1 304 Not Modified');
 111             header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 112             header('Cache-Control: public, max-age='.$lifetime);
 113             header('Content-Type: '.$mimetype);
 114             header('Etag: "'.$etag.'"');
 115             die;
 116         }
 117         send_cached_font("$candidatelocation/$font", $etag, $font, $mimetype);
 118     }
 119 }
 120
 121 // Ok, now we need to start normal moodle script, we need to load all libs and $DB.
 122 define('ABORT_AFTER_CONFIG_CANCEL', true);
 123
 124 define('NO_MOODLE_COOKIES', true); // Session not used here.
 125 define('NO_UPGRADE_CHECK', true);  // Ignore upgrade check.
 126
 127 require("$CFG->dirroot/lib/setup.php");
 128
 129 $theme = theme_config::load($themename);
 130 $themerev = theme_get_revision();
 131
 132 $fontfile = $theme->resolve_font_location($font, $component);
 133
 134 if ($themerev <= 0 or $rev != $themerev) {
 135     // Do not send caching headers if they do not request current revision,
 136     // we do not want to pollute browser caches with outdated fonts.
 137     if (empty($fontfile) or !is_readable($fontfile)) {
 138         font_not_found();
 139     }
 140     send_uncached_font($fontfile, $font, $mimetype);
 141 }
 142
 143 make_localcache_directory('theme', false);
 144
 145 if (empty($fontfile) or !is_readable($fontfile)) {
 146     if (!file_exists($candidatelocation)) {
 147         @mkdir($candidatelocation, $CFG->directorypermissions, true);
 148     }
 149     // Make note we can not find this file.
 150     $cachefont = "$candidatelocation/$font.error";
 151     $fp = fopen($cachefont, 'w');
 152     fclose($fp);
 153     font_not_found();
 154 }
 155
 156 $cachefont = cache_font($font, $fontfile, $candidatelocation);
 157 if (connection_aborted()) {
 158     die;
 159 }
 160 // Make sure nothing failed.
 161 clearstatcache();
 162 if (file_exists($cachefont)) {
 163     send_cached_font($cachefont, $etag, $font, $mimetype);
 164 }
 165
 166 send_uncached_font($fontfile, $font, $mimetype);
 167
 168
 169
 170 // Utility functions.
 171
 172 function send_cached_font($fontpath, $etag, $font, $mimetype) {
 173     global $CFG;
 174     require("$CFG->dirroot/lib/xsendfilelib.php");
 175
 176     $lifetime = 60*60*24*60; // 60 days only - the revision may get incremented quite often.
 177
 178     header('Etag: "'.$etag.'"');
 179     header('Content-Disposition: inline; filename="'.$font.'"');
 180     header('Last-Modified: '. gmdate('D, d M Y H:i:s', filemtime($fontpath)) .' GMT');
 181     header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
 182     header('Pragma: ');
 183     header('Cache-Control: public, max-age='.$lifetime);
 184     header('Accept-Ranges: none');
 185     header('Content-Type: '.$mimetype);
 186     header('Content-Length: '.filesize($fontpath));
 187
 188     if (xsendfile($fontpath)) {
 189         die;
 190     }
 191
 192     // No need to gzip already compressed fonts.
 193
 194     readfile($fontpath);
 195     die;
 196 }
 197
 198 function send_uncached_font($fontpath, $font, $mimetype) {
 199     header('Content-Disposition: inline; filename="'.$font.'"');
 200     header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
 201     header('Expires: '. gmdate('D, d M Y H:i:s', time() + 15) .' GMT');
 202     header('Pragma: ');
 203     header('Accept-Ranges: none');
 204     header('Content-Type: '.$mimetype);
 205     header('Content-Length: '.filesize($fontpath));
 206
 207     readfile($fontpath);
 208     die;
 209 }
 210
 211 function font_not_found() {
 212     header('HTTP/1.0 404 not found');
 213     die('font was not found, sorry.');
 214 }
 215
 216 /**
 217  * Caches a given font file.
 218  *
 219  * @param string $font The name of the font that was requested.
 220  * @param string $fontfile The location of the font file we want to cache.
 221  * @param string $candidatelocation The location to cache it in.
 222  * @return string The path to the cached font.
 223  */
 224 function cache_font($font, $fontfile, $candidatelocation) {
 225     global $CFG;
 226     $cachefont = "$candidatelocation/$font";
 227
 228     clearstatcache();
 229     if (!file_exists($candidatelocation)) {
 230         @mkdir($candidatelocation, $CFG->directorypermissions, true);
 231     }
 232
 233     // Prevent serving of incomplete file from concurrent request,
 234     // the rename() should be more atomic than copy().
 235     ignore_user_abort(true);
 236     if (@copy($fontfile, $cachefont.'.tmp')) {
 237         rename($cachefont.'.tmp', $cachefont);
 238         @chmod($cachefont, $CFG->filepermissions);
 239         @unlink($cachefont.'.tmp'); // Just in case anything fails.
 240     }
 241     return $cachefont;
 242 }