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| Rev | Author | Line No. | Line |
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| 375 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | /* |
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| 4 | * OIDplus 2.0 |
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| 5 | * Copyright 2019 Daniel Marschall, ViaThinkSoft |
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| 6 | * |
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 8 | * you may not use this file except in compliance with the License. |
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| 9 | * You may obtain a copy of the License at |
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| 10 | * |
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 12 | * |
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| 13 | * Unless required by applicable law or agreed to in writing, software |
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 16 | * See the License for the specific language governing permissions and |
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| 17 | * limitations under the License. |
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| 18 | */ |
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| 19 | |||
| 20 | // We do this stuff to avoid that the client includes an externa JavaScript from polyfill.io, |
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| 21 | // since some users might have a problem with that (in regards privacy of their IP address etc.) |
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| 22 | // So, the OIDplus webserver will act as proxy. |
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| 23 | |||
| 376 | daniel-mar | 24 | define('REQUIRED_POLYFILLS', array( |
| 25 | 'fetch', // Internet Explorer |
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| 26 | 'URL' // Internet Explorer |
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| 27 | )); |
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| 375 | daniel-mar | 28 | |
| 376 | daniel-mar | 29 | define('MINIFY_POLYFILL', true); |
| 30 | |||
| 31 | define('POLYFILL_CACHE_MAX_AGE', 24*60*60); |
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| 32 | |||
| 33 | # --- |
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| 34 | |||
| 35 | header('Content-Type:application/javascript'); |
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| 36 | |||
| 37 | if (!isset($_SERVER['HTTP_USER_AGENT'])) die('/* ERROR: No User Agent available */'); |
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| 38 | |||
| 375 | daniel-mar | 39 | $ua = $_SERVER['HTTP_USER_AGENT']; |
| 40 | |||
| 376 | daniel-mar | 41 | if (MINIFY_POLYFILL) { |
| 42 | $cache_file = __DIR__ . '/userdata/cache/.polyfill_'.md5(implode(',',REQUIRED_POLYFILLS)).'_'.md5($ua).'.min.js'; |
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| 43 | } else { |
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| 44 | $cache_file = __DIR__ . '/userdata/cache/.polyfill_'.md5(implode(',',REQUIRED_POLYFILLS)).'_'.md5($ua).'.js'; |
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| 45 | } |
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| 375 | daniel-mar | 46 | |
| 376 | daniel-mar | 47 | if (!file_exists($cache_file) || (time()-filemtime($cache_file)) > POLYFILL_CACHE_MAX_AGE) { |
| 375 | daniel-mar | 48 | |
| 376 | daniel-mar | 49 | if (MINIFY_POLYFILL) { |
| 50 | $url = 'https://polyfill.io/v3/polyfill.min.js?features='.urlencode(implode(',',REQUIRED_POLYFILLS)); |
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| 51 | } else { |
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| 52 | $url = 'https://polyfill.io/v3/polyfill.js?features='.urlencode(implode(',',REQUIRED_POLYFILLS)); |
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| 53 | } |
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| 54 | |||
| 55 | $opts = [ |
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| 56 | "http" => [ |
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| 57 | "method" => "GET", |
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| 58 | "header" => "User-Agent: ".$ua."\r\n" |
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| 59 | ] |
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| 60 | ]; |
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| 61 | $context = stream_context_create($opts); |
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| 62 | $cont = @file_get_contents($url, false, $context); |
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| 63 | |||
| 64 | if ($cont === false) { |
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| 65 | |||
| 66 | if (file_exists($cache_file)) { |
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| 67 | $out = file_get_contents($cache_file); |
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| 68 | } else { |
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| 69 | die('/* ERROR: polyfill.io not available and no cache file exists! */'); |
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| 70 | } |
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| 71 | |||
| 72 | } else { |
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| 73 | |||
| 74 | $ua = str_replace('*/', '', $ua); |
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| 75 | $cont = '/* Polyfill '.$url.' for '.$ua.' */'.$cont; // TODO: escape |
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| 76 | |||
| 77 | @file_put_contents($cache_file, $cont); |
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| 78 | |||
| 79 | $out = $cont; |
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| 80 | |||
| 81 | } |
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| 82 | |||
| 83 | } else { |
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| 84 | |||
| 85 | $out = file_get_contents($cache_file); |
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| 86 | |||
| 87 | } |
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| 88 | |||
| 375 | daniel-mar | 89 | # --- |
| 90 | |||
| 91 | $etag = md5($out); |
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| 92 | header("Etag: $etag"); |
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| 93 | header('Content-MD5: '.$etag); // RFC 2616 clause 14.15 |
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| 94 | if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && (trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag)) { |
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| 95 | header("HTTP/1.1 304 Not Modified"); |
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| 96 | } else { |
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| 97 | echo $out; |
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| 98 | } |