block_google_hangout.php

<?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/>.

/**
 * google_hangout block caps.
 *
 * @package    block_google_hangout
 * @copyright  @copyright Nadav Kavalerchik <nadavkav@gmail.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

class block_google_hangout extends block_base {

    function init() {
        $this->title = get_string('pluginname', 'block_google_hangout');
    }

    function get_content() {
        global $CFG, $OUTPUT;

        if ($this->content !== null) {
            return $this->content;
        }

        $this->content = new stdClass;
        $this->content->footer = '';

        if (empty($this->instance)) {
            $this->content->text   = '';
            return $this->content;
        }

        // user/index.php expect course context, so get one if page has module context.
        $currentcontext = $this->page->context->get_course_context(false);

        if (! empty($this->config->text)) {
            $this->content->text = $this->config->text;
        }

        $this->content->text = 'No Hangout';
        if (empty($currentcontext)) {
            return $this->content;
        }
        if ($this->page->course->id == SITEID) {
            $this->context->text .= "site context";
        }

        $users = get_enrolled_users($currentcontext);
        $usersemails = '';
        foreach ($users as $user) {
            $usersemails .= "{ id : '$user->email', invite_type : 'EMAIL' },";
        }

        $this->content->text = "<script src=\"https://apis.google.com/js/platform.js\" async defer></script>
            <g:hangout render=\"createhangout\" invites=\"[$usersemails]\"></g:hangout>";

        $this->content->text .=
        '<br><a href= "'.$CFG->wwwroot.'/blocks/google_hangout/select_users.php?courseid='.$this->page->course->id.'" alt="Select users">Hangout with selected users</a>';

        if (! empty($this->config->text)) {
            $this->content->text .= $this->config->text;
        }

        return $this->content;
    }

    // my moodle can only have SITEID and it's redundant here, so take it away
    public function applicable_formats() {
        return array('all' => false,
                     'site' => true,
                     'site-index' => true,
                     'course-view' => true, 
                     'course-view-social' => false,
                     'mod' => true, 
                     'mod-quiz' => false);
    }

    public function instance_allow_multiple() {
          return false;
    }

    function has_config() {
        return true;
    }

    public function cron() {
            mtrace( "Hey, my cron script is running" );
             
                 // do something
                  
                      return true;
    }
}