<?php
/* Written by Noel Dieschburg <noel@cblue.be> for the paris5 university

* Checks if the user is already logged in via the cas system
* Gets all the info via the ldap module (ldap has to work)

*/
require_once api_get_path(SYS_PATH).'main/auth/cas/cas_var.inc.php';
require_once api_get_path(SYS_PATH).'main/auth/external_login/ldap.inc.php';
require_once api_get_path(SYS_PATH).'main/auth/external_login/functions.inc.php';

/**
* @return true if cas is configured
*
**/
function cas_configured() {
	global $cas_auth_ver, $cas_auth_server, $cas_auth_port, $cas_auth_uri;
    $res = false;
    if (!empty($cas_auth_ver) && !empty($cas_auth_server) && !empty($cas_auth_port)) {
        $res = true;
    }

    return $res;
}


/**
* checks if the user already get a session
* @return the user login if the user already has a session ,false otherwise
**/

function cas_is_authenticated()
{
	global $cas_auth_ver, $cas_auth_server, $cas_auth_port, $cas_auth_uri;
	global $PHPCAS_CLIENT;
	global $logout;

    if (!cas_configured()) {
        return;
    }

	if (!is_object($PHPCAS_CLIENT)) {
		phpCAS::client($cas_auth_ver,$cas_auth_server,$cas_auth_port,$cas_auth_uri);
		phpCAS::setNoCasServerValidation();
	}
	$auth = phpCAS::checkAuthentication();

	if ($auth) {
		$login= trim(phpCAS::getUser());
		/*
		   Get user  attributes. Here are the attributes for crdp platform
		   sn => name
		   ENTPersonMailInterne => mail
		   ENTPersonAlias => login
		   ENTPersonProfils => profil
		   givenName => first name
		 */
		/*$user=phpCAS::getAttributes();
		$firstName = trim($user['givenName']);
		$lastName = trim($user['sn']);
		$login = trim($user['ENTPersonAlias']);
		$profil = trim($user['ENTPersonProfils']);
		$email = trim($user['ENTPersonMailInterne']);
		$satus=5;
		switch ($profil){
			case 'admin_etab':
				$status=3; //Session admin
				break;
			case 'admin_sie':
				$status=3; //Session admin
				break;
			case 'National_3':
				$status=1; // Teacher
				break;
			case 'National_1':
				$status=5; // Student
				break;
			default:
				$status=5; // Student
		}*/
		if (!$logout){
		    // get user info from username
		    $tab_user_info = api_get_user_info($login);

		    // user found in the chamilo database
		    if (is_array($tab_user_info)) {
		        // if option is on we update user automatically from ldap server
		        if (api_get_setting("update_user_info_cas_with_ldap") == "true") {
                    $ldapuser = extldap_authenticate($login, 'nopass', true);
                    if ($ldapuser !== false) {
                        $chamilo_user = extldap_get_chamilo_user($ldapuser);
                        $chamilo_user['user_id'] = $tab_user_info['user_id'];
                        $chamilo_user['status'] = $tab_user_info['status'];
        				UserManager::update_user ($chamilo_user["user_id"], $chamilo_user["firstname"], $chamilo_user["lastname"], $login, null, null, $chamilo_user["email"], $chamilo_user["status"], '', '', '', '', 1, null, 0, null,'') ;
		            }
		        }
		        return $login;
		    }
		    // user not found
		    else {
		        // if option is on we can ADD user automatically from ldap server or by modify own profil
		        $user_added = false;
		        switch (api_get_setting("cas_add_user_activate")) {
		            case PLATFORM_AUTH_SOURCE :
		                // user will have to modify firstname, lastname, email in chamilo profil edit
		                $userdata = get_lang("EditInProfil");
          				UserManager::create_user($userdata, $userdata, '5', $userdata, $login, 'casplaceholder', '','','','',CAS_AUTH_SOURCE);
          				$user_added = $login;
		                break;
		            case LDAP_AUTH_SOURCE :
		                // user info are read from ldap connexion
	                    // get user info from ldap server
	                    // user has already been authenticated by CAS
	                    // If user not found in LDAP, user not created
	                    $ldapuser = extldap_authenticate($login, 'nopass', true);
	                    if ($ldapuser !== false) {
	                        $chamilo_user = extldap_get_chamilo_user($ldapuser);
                            $chamilo_user['username'] = $login;
                            $chamilo_user['auth_source'] = CAS_AUTH_SOURCE;
                            $chamilo_uid = external_add_user($chamilo_user);
          				    $user_added = $login;
          				}
		                break;
		            default : break;
		        }
		        return $user_added;
		    }
		}
//		//If the user is in the dokeos database and we are ,not in a logout request, we upgrade his infomration by ldap
//		if (! $logout){
//			$user_table = Database::get_main_table(TABLE_MAIN_USER);
//			$sql = "SELECT user_id, username, password, auth_source, active, expiration_date ".
//				"FROM $user_table ".
//				"WHERE username = '$login' ";
//
//			$result = Database::query($sql,__FILE__,__LINE__);
//			if(mysql_num_rows($result) == 0) {
//				require_once(api_get_path(SYS_PATH).'main/inc/lib/usermanager.lib.php');
//				$rnumber=rand(0,256000);
//				UserManager::create_user($firstName, $lastName, $status, $email, $login, md5('casplaceholder'.$rnumber), $official_code='',$language='',$phone='',$picture_uri='',$auth_source = PLATFORM_AUTH_SOURCE);
//			}
//			else {
//				$user = mysql_fetch_assoc($result);
//				$user_id = intval($user['user_id']);
//				//echo "deb : $status";
//				UserManager::update_user ($user_id, $firstname, $lastname, $login, null, null, $email, $status, '', '', '', '', 1, null, 0, null,'') ;
//
//			}
//		}
		return $login;
    } else {
		return false;
	}
}

/**
 * Logs out the user of the cas
 * The user MUST be logged in with cas to use this function
 *
 * @param $uinfo array user info (not needed)
 * @param $location string redirect url
 *
 * @see online_logout()
 */
function cas_logout($uinfo=null, $location=null)
{
    global $cas_auth_ver, $cas_auth_server, $cas_auth_port, $cas_auth_uri;
    global $PHPCAS_CLIENT;
    if (!is_object($PHPCAS_CLIENT)) {
        phpCAS::client($cas_auth_ver, $cas_auth_server, $cas_auth_port, $cas_auth_uri);
        phpCAS::setNoCasServerValidation();
    }

    if (!isset($location)) {
        $location = api_get_path(WEB_PATH);
    }

    phpCAS::logoutWithRedirectService($location);
}

/*
 * Return the direct URL to a course code with CAS login
 */
function get_cas_direct_URL($in_course_code)
{
    return api_get_path(WEB_PATH).'main/auth/cas/logincas.php?firstpage='.$in_course_code;
}

function getCASLogoHTML()
{
    $out_res = "";
    if (api_get_setting("casLogoURL") != "") {
        $out_res = "<img src='".api_get_setting("casLogoURL")."' alt='CAS Logo' />";
    }
    return $out_res;
}