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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; under version 2 |
| 7 | * of the License (non-upgradable). |
| 8 | * |
| 9 | * This program 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 this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | * Copyright (c) 2008-2010 (original work) Deutsche Institut für Internationale Pädagogische Forschung |
| 19 | * (under the project TAO-TRANSFER); |
| 20 | * 2009-2012 (update and modification) Public Research Centre Henri Tudor |
| 21 | * (under the project TAO-SUSTAIN & TAO-DEV); |
| 22 | * 2012-2016 (update and modification) Open Assessment Technologies SA; |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | /** |
| 27 | * Utilities on requests |
| 28 | * |
| 29 | * @access public |
| 30 | * @author Bertrand Chevrier, <bertrand.chevrier@tudor.lu> |
| 31 | * @package tao |
| 32 | |
| 33 | */ |
| 34 | class tao_helpers_Request |
| 35 | { |
| 36 | // --- ASSOCIATIONS --- |
| 37 | |
| 38 | |
| 39 | // --- ATTRIBUTES --- |
| 40 | |
| 41 | // --- OPERATIONS --- |
| 42 | |
| 43 | /** |
| 44 | * Enables you to know if the request in the current scope is an ajax |
| 45 | * |
| 46 | * @access public |
| 47 | * @author Bertrand Chevrier, <bertrand.chevrier@tudor.lu> |
| 48 | * @return boolean |
| 49 | */ |
| 50 | public static function isAjax() |
| 51 | { |
| 52 | $returnValue = (bool) false; |
| 53 | |
| 54 | if (isset($_SERVER['HTTP_X_REQUESTED_WITH'])) { |
| 55 | if (strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') { |
| 56 | $returnValue = true; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | return (bool) $returnValue; |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Returns the current relative call url, without leading slash |
| 65 | * |
| 66 | * @param string $url |
| 67 | * @throws ResolverException |
| 68 | * @return string |
| 69 | */ |
| 70 | public static function getRelativeUrl($url = null) |
| 71 | { |
| 72 | $url = is_null($url) ? '/' . ltrim($_SERVER['REQUEST_URI'], '/') : $url; |
| 73 | $rootUrlPath = parse_url(ROOT_URL, PHP_URL_PATH); |
| 74 | $absPath = parse_url($url, PHP_URL_PATH); |
| 75 | if (substr($absPath, 0, strlen($rootUrlPath)) != $rootUrlPath) { |
| 76 | throw new ResolverException('Request Uri ' . $url . ' outside of TAO path ' . ROOT_URL); |
| 77 | } |
| 78 | if ($absPath === $rootUrlPath) { |
| 79 | $result = ''; |
| 80 | } else { |
| 81 | $result = substr($absPath, strlen($rootUrlPath)); |
| 82 | } |
| 83 | return $result; |
| 84 | } |
| 85 | |
| 86 | |
| 87 | /** |
| 88 | * Perform an HTTP Request on the defined url and return the content |
| 89 | * |
| 90 | * @access public |
| 91 | * @author Bertrand Chevrier, <bertrand.chevrier@tudor.lu> |
| 92 | * @param string url |
| 93 | * @param boolean useSession if you want to use the same session in the remotre server |
| 94 | * @return string |
| 95 | * @throws Exception |
| 96 | */ |
| 97 | public static function load($url, $useSession = false) |
| 98 | { |
| 99 | $returnValue = (string) ''; |
| 100 | |
| 101 | |
| 102 | |
| 103 | if (!empty($url)) { |
| 104 | if ($useSession) { |
| 105 | session_write_close(); |
| 106 | } |
| 107 | |
| 108 | $curlHandler = curl_init(); |
| 109 | |
| 110 | //if there is an http auth, it's mandatory to connect with curl |
| 111 | if (USE_HTTP_AUTH) { |
| 112 | curl_setopt($curlHandler, CURLOPT_HTTPAUTH, CURLAUTH_BASIC); |
| 113 | curl_setopt($curlHandler, CURLOPT_USERPWD, USE_HTTP_USER . ":" . USE_HTTP_PASS); |
| 114 | } |
| 115 | curl_setopt($curlHandler, CURLOPT_RETURNTRANSFER, 1); |
| 116 | |
| 117 | //to keep the session |
| 118 | if ($useSession) { |
| 119 | if (!preg_match("/&$/", $url)) { |
| 120 | $url .= '&'; |
| 121 | } |
| 122 | $url .= 'session_id=' . session_id(); |
| 123 | curl_setopt($curlHandler, CURLOPT_COOKIE, session_name() . '=' . $_COOKIE[session_name()] . '; path=/'); |
| 124 | } |
| 125 | |
| 126 | curl_setopt($curlHandler, CURLOPT_URL, $url); |
| 127 | |
| 128 | $returnValue = curl_exec($curlHandler); |
| 129 | if (curl_errno($curlHandler) > 0) { |
| 130 | throw new Exception("Request error " . curl_errno($curlHandler) . ": " . curl_error($curlHandler)); |
| 131 | } |
| 132 | curl_close($curlHandler); |
| 133 | } |
| 134 | |
| 135 | |
| 136 | |
| 137 | return (string) $returnValue; |
| 138 | } |
| 139 | } |