<?php // $Id$
/**
 * An object to represent lots of information about an RPC-peer machine
 *
 * @author  Donal McMullan  donal@catalyst.net.nz
 * @version 0.0.1
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package mnet
 */

class mnet_peer {

    //Unless stated otherwise, properties of this object are unescaped, and unsafe to
    //insert into the db without further processing.
    var $id                 = 0;
    var $wwwroot            = '';
    var $ip_address         = '';
    var $name               = '';
    var $public_key         = '';
    var $public_key_expires = 0;
    var $last_connect_time  = 0;
    var $last_log_id        = 0;
    var $force_theme        = 0;
    var $theme              = '';
    var $applicationid      = 1; // Default of 1 == Moodle
    var $keypair            = array();
    var $error              = array();
    //Object whose properties need to be put into the database:
    //(properties here are slashescaped)
    var $updateparams;

    function mnet_peer() {
        $this->updateparams = new stdClass();
        return true;
    }

    function bootstrap($wwwroot, $pubkey = null, $application) {

        if (substr($wwwroot, -1, 1) == '/') {
            $wwwroot = substr($wwwroot, 0, -1);
        }

        if ( ! $this->set_wwwroot($wwwroot) ) {
            $hostname = mnet_get_hostname_from_uri($wwwroot);

            // Get the IP address for that host - if this fails, it will
            // return the hostname string
            $ip_address = gethostbyname($hostname);

            // Couldn't find the IP address?
            if ($ip_address === $hostname && !preg_match('/^\d+\.\d+\.\d+.\d+$/',$hostname)) {
                $this->error[] = array('code' => 2, 'text' => get_string("noaddressforhost", 'mnet'));
                return false;
            }

            $this->name = stripslashes($wwwroot);
            $this->updateparams->name = $wwwroot;

            // TODO: In reality, this will be prohibitively slow... need another
            // default - maybe blank string
// (Shirai215): Proxy環境においてMoodleネットワークのビアで新しいホストを追加する際にホストとの通信に失敗する問題 (2011/08/09)
// (Shirai215): ここから修正
//          $homepage = file_get_contents($wwwroot);
            global $CFG;
            if (fs_mnet_check_usingproxy($wwwroot)) $homepage = download_file_content($wwwroot);
                else                                $homepage = file_get_contents($wwwroot);
// (Shirai215): ここまで修正
            if (!empty($homepage)) {
                $count = preg_match("@<title>(.*)</title>@siU", $homepage, $matches);
                if ($count > 0) {
                    $this->name = $matches[1];
                    $this->updateparams->name = addslashes($matches[1]);
                }
            }

            $this->wwwroot = stripslashes($wwwroot);
            $this->updateparams->wwwroot = $wwwroot;
            $this->ip_address = $ip_address;
            $this->updateparams->ip_address = $ip_address;
            $this->deleted = 0;
            $this->updateparams->deleted = 0;

            $this->application = get_record('mnet_application', 'name', $application);
            if (empty($this->application)) {
                $this->application = get_record('mnet_application', 'name', 'moodle');
            }

            $this->applicationid = $this->application->id;
            $this->updateparams->applicationid = $this->application->id;

            if(empty($pubkey)) {
                $pubkeytemp = clean_param(mnet_get_public_key($this->wwwroot, $this->application), PARAM_PEM);
            } else {
                $pubkeytemp = clean_param($pubkey, PARAM_PEM);
            }
            $this->public_key_expires = $this->check_common_name($pubkeytemp);

            if ($this->public_key_expires == false) {
                return false;
            }
            $this->updateparams->public_key_expires = $this->public_key_expires;

            $this->updateparams->public_key = $pubkeytemp;
            $this->public_key = $pubkeytemp;

            $this->last_connect_time = 0;
            $this->updateparams->last_connect_time = 0;
            $this->last_log_id = 0;
            $this->updateparams->last_log_id = 0;
        }

        return true;
    }

    function delete() {
        if ($this->deleted) { 
            return true;
        }

        $this->delete_all_sessions();

        $this->deleted = 1;
        $this->updateparams->deleted = 1;
        $this->commit();
    }

    function count_live_sessions() {
        $obj = $this->delete_expired_sessions();
        return count_records('mnet_session','mnethostid', $this->id);
    }

    function delete_expired_sessions() {
        $now = time();
        return delete_records_select('mnet_session', " mnethostid = '{$this->id}' AND expires < '$now' ");
    }

    function delete_all_sessions() {
        global $CFG;
        // TODO: Expires each PHP session individually
        // $sessions = get_records('mnet_session', 'mnethostid', $this->id);
        $sessions = get_records('mnet_session', 'mnethostid', $this->id);

        if (count($sessions) > 0 && file_exists($CFG->dirroot.'/auth/mnet/auth.php')) {
            require_once($CFG->dirroot.'/auth/mnet/auth.php');
            $auth = new auth_plugin_mnet();
            $auth->end_local_sessions($sessions);
        }

        $deletereturn = delete_records_select('mnet_session', " mnethostid = '{$this->id}'");
        return true;
    }

    function check_common_name($key) {
        $credentials = openssl_x509_parse($key);
        if ($credentials == false) {
            $this->error[] = array('code' => 3, 'text' => get_string("nonmatchingcert", 'mnet', array('','')));
            return false;
        } elseif ($credentials['subject']['CN'] != $this->wwwroot) {
            $a[] = $credentials['subject']['CN'];
            $a[] = $this->wwwroot;
            $this->error[] = array('code' => 4, 'text' => get_string("nonmatchingcert", 'mnet', $a));
            return false;
        } else {
            return $credentials['validTo_time_t'];
        }
    }

    function commit() {
        $obj = $this->updateparams;

        if (isset($this->id) && $this->id > 0) {
            $obj->id = $this->id;
            $dbresult = update_record('mnet_host', $obj);
        } else {
            $this->id = insert_record('mnet_host', $obj);
            $dbresult = ($this->id > 0);
        }
        //If the insert/update was successful, clear the parameters that need updating
        if ($dbresult) {
            $this->updateparams = new stdClass();
        }
        return $dbresult;
    }

    function touch() {
        $this->last_connect_time = time();
        $this->updateparams->last_connect_time = time();
        $this->commit();
    }

    function set_name($newname) {
        if (is_string($newname) && strlen($newname <= 80)) {
            $this->name = stripslashes($newname);
            $this->updateparams->name = $newname;
            return true;
        }
        return false;
    }

    function set_applicationid($applicationid) {
        if (is_numeric($applicationid) && $applicationid == intval($applicationid)) {
            $this->applicationid = $applicationid;
            $this->updateparams->applicationid = $applicationid;
            return true;
        }
        return false;
    }

    function set_wwwroot($wwwroot) {
        global $CFG;

        $hostinfo = get_record('mnet_host', 'wwwroot', $wwwroot);

        if ($hostinfo != false) {
            $this->populate($hostinfo);
            return true;
        }
        return false;
    }

    function set_id($id) {
        global $CFG;

        if (clean_param($id, PARAM_INT) != $id) {
            $this->errno[]  = 1;
            $this->errmsg[] = 'Your id ('.$id.') is not legal';
            return false;
        }

        $sql = "
                SELECT
                    h.*
                FROM
                    {$CFG->prefix}mnet_host h
                WHERE
                    h.id = '". $id ."'";

        if ($hostinfo = get_record_sql($sql)) {
            $this->populate($hostinfo);
            return true;
        }
        return false;
    }

    /**
     * Several methods can be used to get an 'mnet_host' record. They all then
     * send it to this private method to populate this object's attributes.
     * 
     * @param   object  $hostinfo   A database record from the mnet_host table
     * @return  void
     */
    function populate($hostinfo) {
        $this->id                   = $hostinfo->id;
        $this->wwwroot              = $hostinfo->wwwroot;
        $this->ip_address           = $hostinfo->ip_address;
        $this->name                 = $hostinfo->name;
        $this->deleted              = $hostinfo->deleted;
        $this->public_key           = $hostinfo->public_key;
        $this->public_key_expires   = $hostinfo->public_key_expires;
        $this->last_connect_time    = $hostinfo->last_connect_time;
        $this->last_log_id          = $hostinfo->last_log_id;
        $this->force_theme          = $hostinfo->force_theme;
        $this->theme                = $hostinfo->theme;
        $this->applicationid        = $hostinfo->applicationid;
        $this->application = get_record('mnet_application', 'id', $this->applicationid);
    }

    function get_public_key() {
        if (isset($this->public_key_ref)) return $this->public_key_ref;
        $this->public_key_ref = openssl_pkey_get_public($this->public_key);
        return $this->public_key_ref;
    }
}

?>
