<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * This file contains two forms for adding/editing mnet hosts, used by peers.php
 *
 * @package    core
 * @subpackage mnet
 * @copyright  2010 Penny Leach
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

require_once($CFG->libdir . '/formslib.php');

/**
 * The very basic first step add new host form - just wwwroot & application
 * The second form is loaded up with the information from this one.
 */
class mnet_simple_host_form extends moodleform {
    function definition() {
        global $DB;

        $mform = $this->_form;

        $mform->addElement('text', 'wwwroot', get_string('hostname', 'mnet'));
        $mform->setType('wwwroot', PARAM_URL);
        $mform->addRule('wwwroot', null, 'required', null, 'client');

        $mform->addElement('select', 'applicationid', get_string('applicationtype', 'mnet'),
                           $DB->get_records_menu('mnet_application', array(), 'id,display_name'));
        $mform->addRule('applicationid', null, 'required', null, 'client');

        $this->add_action_buttons(false, get_string('addhost', 'mnet'));
    }

    function validation($data) {
        global $DB;

        $wwwroot = $data['wwwroot'];
        // ensure the wwwroot starts with a http or https prefix
        if (strtolower(substr($wwwroot, 0, 4)) != 'http') {
            $wwwroot = 'http://'.$wwwroot;
        }
        if ($host = $DB->get_record('mnet_host', array('wwwroot' => $wwwroot))) {
            global $CFG;
            return array('wwwroot' => get_string('hostexists', 'mnet', $CFG->wwwroot . '/admin/mnet/peers.php?hostid=' . $host->id));
        }
        return array();
    }
}

/**
 * The second step of the form - reviewing the host details
 * This is also the same form that is used for editing an existing host
 */
class mnet_review_host_form extends moodleform {
    function definition() {
        global $OUTPUT;

        $mform = $this->_form;
        $mnet_peer = $this->_customdata['peer'];

        $mform->addElement('hidden', 'last_connect_time');
        $mform->addElement('hidden', 'id');
        $mform->addElement('hidden', 'applicationid');
        $mform->addElement('hidden', 'oldpublickey');

        $mform->addElement('text', 'name', get_string('site'));
        $mform->setType('name', PARAM_NOTAGS);

        $mform->addElement('text', 'wwwroot', get_string('hostname', 'mnet'));
        $mform->setType('wwwroot', PARAM_URL);

        $themes = array('' => get_string('forceno'));
        foreach (array_keys(get_plugin_list('theme')) as $themename) {
            $themes[$themename] = get_string('pluginname', 'theme_'.$themename);
        }
        $mform->addElement('select', 'theme', get_string('forcetheme'), $themes);

        $mform->addElement('textarea', 'public_key', get_string('publickey', 'mnet'), array('rows' => 17, 'cols' => 100, 'class' => 'smalltext'));
        $mform->setType('public_key', PARAM_PEM);

        if ($mnet_peer && !empty($mnet_peer->deleted)) {
            $radioarray = array();
            $radioarray[] = MoodleQuickForm::createElement('radio', 'deleted', '', get_string('yes'), 1);
            $radioarray[] = MoodleQuickForm::createElement('radio', 'deleted', '', get_string('no'), 0);
            $mform->addGroup($radioarray, 'radioar', get_string('deleted'), array(' '), false);
        } else {
            $mform->addElement('hidden', 'deleted');
        }

        // finished with form controls, now the static informational stuff
        if ($mnet_peer && !empty($mnet_peer->bootstrapped)) {
            $expires = '';
            if ($mnet_peer->public_key_expires < time()) {
                $expires = get_string('expired', 'mnet')  . ' ';
            }
            $expires .= userdate($mnet_peer->public_key_expires);
            $mform->addElement('static', 'validuntil', get_string('expires', 'mnet'), $expires);

            $lastconnect = '';
            if ($mnet_peer->last_connect_time == 0) {
                $lastconnect = get_string('never', 'mnet');
            } else {
                $lastconnect = date('H:i:s d/m/Y',$mnet_peer->last_connect_time);
            }

            $mform->addElement('static', 'lastconnect', get_string('last_connect_time', 'mnet'), $lastconnect);
            $mform->addElement('static', 'ipaddress', get_string('ipaddress', 'mnet'), $mnet_peer->ip_address);

            if (isset($mnet_peer->currentkey)) { // key being published is not the same as our records
                $currentkeystr = '<b>' . get_string('keymismatch', 'mnet') . '</b><br /><br /> ' . $OUTPUT->box('<pre>' . $mnet_peer->currentkey . '</pre>');
                $mform->addElement('static', 'keymismatch', get_string('currentkey', 'mnet'), $currentkeystr);
            }

            $credstr = '';
            if ($credentials = $mnet_peer->check_credentials($mnet_peer->public_key)) {
                foreach($credentials['subject'] as $key => $credential) {
                    if (is_scalar($credential)) {
                        $credstr .= str_pad($key, 16, " ", STR_PAD_LEFT).': '.$credential."\n";
                    } else {
                        $credstr .= str_pad($key, 16, " ", STR_PAD_LEFT).': '.var_export($credential,1)."\n";
                    }
                }
            }

            $mform->addElement('static', 'certdetails', get_string('certdetails', 'mnet'), $OUTPUT->box('<pre>' . $credstr . '</pre>'));
        }

        // finished with static stuff, print save button
        $this->add_action_buttons(false);
    }

    function validation($data) {
        $errors = array();
        if ($data['oldpublickey'] == $data['public_key']) {
            return;
        }
        $mnet_peer = new mnet_peer(); // idiotic api
        $mnet_peer->wwwroot = $data['wwwroot']; // just hard-set this rather than bootstrap the object
        if (!$credentials = $mnet_peer->check_credentials($data['public_key'])) {
            $errmsg = '';
            foreach ($mnet_peer->error as $err) {
                $errmsg .= $err['code'] . ': ' . $err['text'].'<br />';
            }
            $errors['public_key'] = get_string('invalidpubkey', 'mnet', $errmsg);
        }
        unset($mnet_peer);
        return $errors;
    }
}
