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+<?php
+
+/**
+ * Example for proxied service with session support
+ *
+ * PHP Version 5
+ *
+ * @file     example_service.php
+ * @category Authentication
+ * @package  PhpCAS
+ * @author   Joachim Fritschi <jfritschi@freenet.de>
+ * @author   Adam Franco <afranco@middlebury.edu>
+ * @license  http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
+ * @link     https://wiki.jasig.org/display/CASC/phpCAS
+ */
+
+// Load the settings from the central config file
+require_once 'config.php';
+// Load the CAS lib
+require_once $phpcas_path . '/CAS.php';
+
+// Uncomment to enable debugging
+phpCAS::setDebug();
+
+// Initialize phpCAS
+phpCAS::client(CAS_VERSION_2_0, $cas_host, $cas_port, $cas_context);
+
+// For production use set the CA certificate that is the issuer of the cert
+// on the CAS server and uncomment the line below
+// phpCAS::setCasServerCACert($cas_server_ca_cert_path);
+
+// For quick testing you can disable SSL validation of the CAS server.
+// THIS SETTING IS NOT RECOMMENDED FOR PRODUCTION.
+// VALIDATING THE CAS SERVER IS CRUCIAL TO THE SECURITY OF THE CAS PROTOCOL!
+phpCAS::setNoCasServerValidation();
+
+// If you want your service to be proxied you have to enable it (default
+// disabled) and define an accepable list of proxies that are allowed to
+// proxy your service.
+//
+// Add each allowed proxy definition object. For the normal CAS_ProxyChain
+// class, the constructor takes an array of proxies to match. The list is in
+// reverse just as seen from the service. Proxies have to be defined in reverse
+// from the service to the user. If a user hits service A and gets proxied via
+// B to service C the list of acceptable on C would be array(B,A). The definition
+// of an individual proxy can be either a string or a regexp (preg_match is used)
+// that will be matched against the proxy list supplied by the cas server
+// when validating the proxy tickets. The strings are compared starting from
+// the beginning and must fully match with the proxies in the list.
+// Example:
+// 		phpCAS::allowProxyChain(new CAS_ProxyChain(array(
+// 				'https://app.example.com/'
+// 			)));
+// 		phpCAS::allowProxyChain(new CAS_ProxyChain(array(
+// 				'/^https:\/\/app[0-9]\.example\.com\/rest\//',
+// 				'http://client.example.com/'
+// 			)));
+phpCAS::allowProxyChain(new CAS_ProxyChain(array($pgtUrlRegexp)));
+phpCAS::allowProxyChain(
+    new CAS_ProxyChain(
+        array('/^' . $pgtBase . 'example_service_that_proxies.php$/',
+            '/^' . $pgtBase . 'example_proxy_serviceWeb_chaining.php$/'
+        )
+    )
+);
+
+// For quick testing or in certain production screnarios you might want to
+// allow allow any other valid service to proxy your service. To do so, add
+// the "Any" chain:
+// 		phpcas::allowProxyChain(new CAS_ProxyChain_Any);
+// THIS SETTING IS HOWEVER NOT RECOMMENDED FOR PRODUCTION AND HAS SECURITY
+// IMPLICATIONS: YOU ARE ALLOWING ANY SERVICE TO ACT ON BEHALF OF A USER
+// ON THIS SERVICE.
+//phpcas::allowProxyChain(new CAS_ProxyChain_Any);
+
+// force CAS authentication
+phpCAS::forceAuthentication();
+
+print '<h1>I am a service that can be proxied.</h1>';
+
+// at this step, the user has been authenticated by the CAS server
+// and the user's login name can be read with phpCAS::getUser().
+require 'script_info.php';
+
+// for this test, simply print that the authentication was successfull
+echo '<p>The user\'s login is <b>' . phpCAS::getUser() . '</b>.</p>';
+
+// increment the number of requests of the session and print it
+if (!isset($_SESSION['n'])) {
+    $_SESSION['n'] = 0;
+}
+echo '<p>request #' . (++$_SESSION['n']) . '</p>';
+
+?>