<?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;
}