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  1. <?php
  2.  
  3. /*
  4.  * OIDplus 2.0
  5.  * Copyright 2019 - 2021 Daniel Marschall, ViaThinkSoft
  6.  *
  7.  * Licensed under the Apache License, Version 2.0 (the "License");
  8.  * you may not use this file except in compliance with the License.
  9.  * You may obtain a copy of the License at
  10.  *
  11.  *     http://www.apache.org/licenses/LICENSE-2.0
  12.  *
  13.  * Unless required by applicable law or agreed to in writing, software
  14.  * distributed under the License is distributed on an "AS IS" BASIS,
  15.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16.  * See the License for the specific language governing permissions and
  17.  * limitations under the License.
  18.  */
  19.  
  20. // We do this stuff to avoid that the client includes an external JavaScript from polyfill.io,
  21. // since some users might have a problem with that (in regards privacy of their IP address etc.)
  22. // So, the OIDplus webserver will act as proxy.
  23.  
  24. // see https://polyfill.io/v3/url-builder/
  25. const REQUIRED_POLYFILLS = array(
  26.         // For various AJAX calls
  27.         'fetch',
  28.         'URL',
  29.  
  30.         // For OIDplusPagePublicWhois.js, OIDplusPageAdminSoftwareUpdate.js, and OIDplusPageAdminColors.js
  31.         'String.prototype.includes',
  32.  
  33.         // For TinyMCE if it is included inside oidplus.min.js.php ( https://github.com/tinymce/tinymce/blob/5c1702a119e683f93e03ecc2231f11d17ce57395/modules/tinymce/src/core/main/ts/api/EditorManager.ts#L271 )
  34.         'document.currentScript'
  35. );
  36.  
  37. const MINIFY_POLYFILL = true; // TODO: put into baseconfig?
  38.  
  39. const POLYFILL_CACHE_MAX_AGE = 24 * 60 * 60; // 1 day, TODO: put into baseconfig?
  40.  
  41. # ---
  42.  
  43. require_once __DIR__ . '/includes/oidplus.inc.php';
  44.  
  45. error_reporting(0);
  46.  
  47. if (!isset($_SERVER['HTTP_USER_AGENT'])) {
  48.         $out = '/* ERROR: No User Agent available */';
  49.         httpOutWithETag($out, 'application/javascript', 'polyfill'.(MINIFY_POLYFILL ? '.min' : '').'.js');
  50. }
  51.  
  52. $ua = $_SERVER['HTTP_USER_AGENT'];
  53.  
  54. if (MINIFY_POLYFILL) {
  55.         $cache_file = __DIR__ . '/userdata/cache/js_polyfill_'.md5(implode(',',REQUIRED_POLYFILLS)).'_'.md5($ua).'.min.js';
  56. } else {
  57.         $cache_file = __DIR__ . '/userdata/cache/js_polyfill_'.md5(implode(',',REQUIRED_POLYFILLS)).'_'.md5($ua).'.js';
  58. }
  59.  
  60. if (!file_exists($cache_file) || (time()-filemtime($cache_file)) > POLYFILL_CACHE_MAX_AGE) {
  61.  
  62.         if (MINIFY_POLYFILL) {
  63.                 $url = 'https://polyfill.io/v3/polyfill.min.js?features='.urlencode(implode(',',REQUIRED_POLYFILLS));
  64.         } else {
  65.                 $url = 'https://polyfill.io/v3/polyfill.js?features='.urlencode(implode(',',REQUIRED_POLYFILLS));
  66.         }
  67.  
  68.         if (!url_get_contents_available(true, $reason)) {
  69.                 $out = '/* ERROR: Cannot connect to the Internet. '.$reason.' */';
  70.                 httpOutWithETag($out, 'application/javascript', 'polyfill'.(MINIFY_POLYFILL ? '.min' : '').'.js');
  71.         }
  72.  
  73.         $cont = url_get_contents($url, [], $ua);
  74.  
  75.         if ($cont === false) {
  76.  
  77.                 if (file_exists($cache_file)) {
  78.                         $out = file_get_contents($cache_file);
  79.  
  80.                         // In case polyfill.io is down, don't delay further requests
  81.                         // Instead, try again after the next max cache age
  82.                         touch($cache_file);
  83.                 } else {
  84.                         $out = '/* ERROR: polyfill.io (' . $url . ') not available and no cache file exists! */';
  85.                         httpOutWithETag($out, 'application/javascript', 'polyfill' . (MINIFY_POLYFILL ? '.min' : '') . '.js');
  86.                 }
  87.  
  88.         } else {
  89.  
  90.                 $ua = str_replace('*/', '', $ua);
  91.                 $cont = '/* Polyfill ' . $url . ' for ' . $ua . ' */' . $cont;
  92.  
  93.                 if (POLYFILL_CACHE_MAX_AGE > 0) {
  94.                         @file_put_contents($cache_file, $cont);
  95.                 }
  96.  
  97.                 $out = $cont;
  98.         }
  99.  
  100. } else {
  101.  
  102.         $out = file_get_contents($cache_file);
  103.  
  104. }
  105.  
  106. # ---
  107.  
  108. if (!$out) $out = '';
  109. httpOutWithETag($out, 'application/javascript', 'polyfill'.(MINIFY_POLYFILL ? '.min' : '').'.js');
  110.