lib/javascript.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 serving optimised JS
  19  *
  20  * @package    core_lib
  21  * @copyright  2010 Petr Skoda (skodak)
  22  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24
  25 // disable moodle specific debug messages and any errors in output,
  26 // comment out when debugging or better look into error log!
  27 define('NO_DEBUG_DISPLAY', true);
  28
  29 // we need just the values from config.php and minlib.php
  30 define('ABORT_AFTER_CONFIG', true);
  31 require('../config.php'); // this stops immediately at the beginning of lib/setup.php
  32 require_once("$CFG->dirroot/lib/jslib.php");
  33 require_once("$CFG->dirroot/lib/classes/minify.php");
  34
  35 if ($slashargument = min_get_slash_argument()) {
  36     $slashargument = ltrim($slashargument, '/');
  37     if (substr_count($slashargument, '/') < 1) {
  38         header('HTTP/1.0 404 not found');
  39         die('Slash argument must contain both a revision and a file path');
  40     }
  41     // image must be last because it may contain "/"
  42     list($rev, $file) = explode('/', $slashargument, 2);
  43     $rev  = min_clean_param($rev, 'INT');
  44     $file = '/'.min_clean_param($file, 'SAFEPATH');
  45
  46 } else {
  47     $rev  = min_optional_param('rev', -1, 'INT');
  48     $file = min_optional_param('jsfile', '', 'RAW'); // 'file' would collide with URL rewriting!
  49 }
  50
  51 // some security first - pick only files with .js extension in dirroot
  52 $jsfiles = array();
  53 $files = explode(',', $file);
  54 foreach ($files as $fsfile) {
  55     $jsfile = realpath($CFG->dirroot.$fsfile);
  56     if ($jsfile === false) {
  57         // does not exist
  58         continue;
  59     }
  60     if ($CFG->dirroot === '/') {
  61         // Some shared hosting sites serve files directly from '/',
  62         // this is NOT supported, but at least allow JS when showing
  63         // errors and warnings.
  64     } else if (strpos($jsfile, $CFG->dirroot . DIRECTORY_SEPARATOR) !== 0) {
  65         // hackers - not in dirroot
  66         continue;
  67     }
  68     if (substr($jsfile, -3) !== '.js') {
  69         // hackers - not a JS file
  70         continue;
  71     }
  72     $jsfiles[] = $jsfile;
  73 }
  74
  75 if (!$jsfiles) {
  76     // bad luck - no valid files
  77     header('HTTP/1.0 404 not found');
  78     die('No valid javascript files found');
  79 }
  80
  81 $etag = sha1($rev.implode(',', $jsfiles));
  82
  83 // Use the caching only for meaningful revision numbers which prevents future cache poisoning.
  84 if ($rev > 0 and $rev < (time() + 60*60)) {
  85     $candidate = $CFG->localcachedir.'/js/'.$etag;
  86
  87     if (file_exists($candidate)) {
  88         if (!empty($_SERVER['HTTP_IF_NONE_MATCH']) || !empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
  89             // we do not actually need to verify the etag value because our files
  90             // never change in cache because we increment the rev parameter
  91             js_send_unmodified(filemtime($candidate), $etag);
  92         }
  93         js_send_cached($candidate, $etag);
  94
  95     } else {
  96         js_write_cache_file_content($candidate, core_minify::js_files($jsfiles));
  97         // verify nothing failed in cache file creation
  98         clearstatcache();
  99         if (file_exists($candidate)) {
 100             js_send_cached($candidate, $etag);
 101         }
 102     }
 103 }
 104
 105 $content = '';
 106 foreach ($jsfiles as $jsfile) {
 107     $content .= file_get_contents($jsfile)."\n";
 108 }
 109 js_send_uncached($content, $etag);