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