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<?php
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/**
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* Licensed to Jasig under one or more contributor license
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* agreements. See the NOTICE file distributed with this work for
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* additional information regarding copyright ownership.
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*
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* Jasig licenses this file to you under the Apache License,
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* Version 2.0 (the "License"); you may not use this file except in
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* compliance with the License. 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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* PHP Version 7
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*
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* @file CAS/ServiceBaseUrl/Base.php
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* @category Authentication
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* @package PhpCAS
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* @author Henry Pan <git@phy25.com>
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
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* @link https://wiki.jasig.org/display/CASC/phpCAS
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*/
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/**
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* Base class of CAS/ServiceBaseUrl that implements isHTTPS method.
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*
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* @class CAS_ServiceBaseUrl_Base
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* @category Authentication
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* @package PhpCAS
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* @author Henry Pan <git@phy25.com>
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
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* @link https://wiki.jasig.org/display/CASC/phpCAS
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*/
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abstract class CAS_ServiceBaseUrl_Base
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implements CAS_ServiceBaseUrl_Interface
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{
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/**
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* Get PHP server name.
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*
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* @return string the server hostname and port of the server
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*/
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abstract public function get();
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/**
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* Check whether HTTPS is used.
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*
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* This is used to construct the protocol in the URL.
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*
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* @return bool true if HTTPS is used
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*/
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public function isHttps() {
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if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
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return ($_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https');
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} elseif (!empty($_SERVER['HTTP_X_FORWARDED_PROTOCOL'])) {
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return ($_SERVER['HTTP_X_FORWARDED_PROTOCOL'] === 'https');
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} elseif ( isset($_SERVER['HTTPS'])
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&& !empty($_SERVER['HTTPS'])
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&& strcasecmp($_SERVER['HTTPS'], 'off') !== 0
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) {
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return true;
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}
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return false;
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}
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/**
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* Remove standard HTTP and HTTPS port for discovery and allowlist input.
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*
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* @param $url URL as https://domain:port without trailing slash
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* @return standardized URL, or the original URL
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* @throws CAS_InvalidArgumentException if the URL does not include the protocol
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*/
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protected function removeStandardPort($url) {
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if (strpos($url, "://") === false) {
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throw new CAS_InvalidArgumentException(
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"Configured base URL should include the protocol string: " . $url);
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}
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$url = rtrim($url, '/');
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if (strpos($url, "https://") === 0 && substr_compare($url, ':443', -4) === 0) {
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return substr($url, 0, -4);
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}
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if (strpos($url, "http://") === 0 && substr_compare($url, ':80', -3) === 0) {
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return substr($url, 0, -3);
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}
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return $url;
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}
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}
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