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375 daniel-mar 1 
<?php
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/*
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 * OIDplus 2.0
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 * Copyright 2019 Daniel Marschall, ViaThinkSoft
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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// We do this stuff to avoid that the client includes an externa JavaScript from polyfill.io,
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// since some users might have a problem with that (in regards privacy of their IP address etc.)
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// So, the OIDplus webserver will act as proxy.
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define('REQUIRED_POLYFILLS', array(
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        'fetch', // Internet Explorer
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        'URL'    // Internet Explorer
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));
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define('MINIFY_POLYFILL', true);
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define('POLYFILL_CACHE_MAX_AGE', 24*60*60); // 1 day
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# ---
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require_once __DIR__ . '/includes/functions.inc.php';
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if (!isset($_SERVER['HTTP_USER_AGENT'])) {
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        $out = '/* ERROR: No User Agent available */';
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        httpOutWithETag($out, 'application/javascript', 'polyfill.js');
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}
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$ua = $_SERVER['HTTP_USER_AGENT'];
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if (MINIFY_POLYFILL) {
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        $cache_file = __DIR__ . '/userdata/cache/.polyfill_'.md5(implode(',',REQUIRED_POLYFILLS)).'_'.md5($ua).'.min.js';
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} else {
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        $cache_file = __DIR__ . '/userdata/cache/.polyfill_'.md5(implode(',',REQUIRED_POLYFILLS)).'_'.md5($ua).'.js';
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}
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if (!file_exists($cache_file) || (time()-filemtime($cache_file)) > POLYFILL_CACHE_MAX_AGE) {
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        if (MINIFY_POLYFILL) {
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                $url = 'https://polyfill.io/v3/polyfill.min.js?features='.urlencode(implode(',',REQUIRED_POLYFILLS));
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        } else {
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                $url = 'https://polyfill.io/v3/polyfill.js?features='.urlencode(implode(',',REQUIRED_POLYFILLS));
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        }
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        $opts = [
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            "http" => [
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                "method" => "GET",
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                "header" => "User-Agent: ".$ua."\r\n"
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            ]
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        ];
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        $context = stream_context_create($opts);
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        $cont = @file_get_contents($url, false, $context);
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        if ($cont === false) {
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                if (file_exists($cache_file)) {
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                        $out = file_get_contents($cache_file);
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                        // In case polyfill.io is down, don't delay further requests
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                        // Instead, try again after the next max cache age
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                        touch($cache_file);
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                } else {
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                        $out = '/* ERROR: polyfill.io not available and no cache file exists! */';
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                        httpOutWithETag($out, 'application/javascript', 'polyfill.js');
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                }
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        } else {
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                $ua = str_replace('*/', '', $ua);
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                $cont = '/* Polyfill '.$url.' for '.$ua.' */'.$cont;
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                @file_put_contents($cache_file, $cont);
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                $out = $cont;
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        }
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} else {
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        $out = file_get_contents($cache_file);
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}
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# ---
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httpOutWithETag($out, 'application/javascript', 'polyfill.js');