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   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);