ajax.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/>.

/**
 * Process ajax requests.
 *
 * @package   mod_icontent
 * @copyright 2016 Leo Renis Santos
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once("../../config.php");
require_once('lib.php');

if (!defined('AJAX_SCRIPT')) {
    define('AJAX_SCRIPT', true);
}

$id = required_param('id', PARAM_INT);
$action = optional_param('action', '', PARAM_ALPHA);
$sesskey = optional_param('sesskey', false, PARAM_TEXT);

if ($id) {
    $cm = get_coursemodule_from_id('icontent', $id, 0, false, MUST_EXIST);
    $course = $DB->get_record('course', ['id' => $cm->course], '*', MUST_EXIST);
    $icontent = $DB->get_record('icontent', ['id' => $cm->instance], '*', MUST_EXIST);
} else if ($n) {
    $icontent = $DB->get_record('icontent', ['id' => $n], '*', MUST_EXIST);
    $course = $DB->get_record('course', ['id' => $icontent->course], '*', MUST_EXIST);
    $cm = get_coursemodule_from_instance('icontent', $icontent->id, $course->id, false, MUST_EXIST);
} else {
    throw new moodle_exception(get_string('incorrectmodule', 'icontent'));
}
require_sesskey();
$context = context_module::instance($cm->id);
require_login($course, true, $cm);
// Check actions.
$return = false;
switch ($action) {
    case 'loadpage':
        require_capability('mod/icontent:view', $context);
        $pagenum = required_param('pagenum', PARAM_INT);
        $return = icontent_ajax_getpage($pagenum, $icontent, $context);
        break;
        // Save and return records table {pages_notes}.
    case 'savereturnpagenotes':
        require_capability('mod/icontent:viewnotes', $context);
        $pageid = required_param('pageid', PARAM_INT);
        $note = new stdClass;
        $note->comment = required_param('comment', PARAM_CLEANHTML);
        $note->cmid = required_param('id', PARAM_INT);
        $note->featured = required_param('featured', PARAM_INT);
        $note->private = required_param('private', PARAM_INT);
        $note->doubttutor = required_param('doubttutor', PARAM_INT);
        $note->tab = required_param('tab', PARAM_ALPHANUMEXT);
        // Prepare return.
        $return = icontent_ajax_savereturnnotes($pageid, $note, $icontent);
        break;
    case 'likenote':
        require_capability('mod/icontent:likenotes', $context);
        $notelike = new stdClass;
        $notelike->pagenoteid = required_param('pagenoteid', PARAM_INT);
        $notelike->cmid = required_param('id', PARAM_INT);
        $return = icontent_ajax_likenote($notelike, $icontent);
        break;
    case 'editnote':
        require_capability('mod/icontent:editnotes', $context);
        $pagenote = new stdClass;
        $pagenote->id = required_param('pagenoteid', PARAM_INT);
        $pagenote->cmid = required_param('id', PARAM_INT);
        $pagenote->comment = required_param('comment', PARAM_CLEANHTML);
        $return = icontent_ajax_editnote($pagenote, $icontent);
        break;
    case 'replynote':
        require_capability('mod/icontent:replynotes', $context);
        $pagenote = new stdClass;
        $pagenote->parent = required_param('parent', PARAM_INT);
        $pagenote->cmid = required_param('id', PARAM_INT);
        $pagenote->comment = required_param('comment', PARAM_CLEANHTML);
        $return = icontent_ajax_replynote($pagenote, $icontent);
        break;
    case 'saveattempt':
        require_capability('mod/icontent:view', $context);
        $formdata = required_param('formdata', PARAM_RAW);
        $return = icontent_ajax_saveattempt($formdata, $cm, $icontent);
        break;
}

echo json_encode($return);
die;