react_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/>.

/**
 * User react to a topic
 *
 * @package    mod_reactforum
 * @copyright  2017 (C) VERSION2, INC.
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define('AJAX_SCRIPT', true);
require_once(dirname(dirname(__DIR__)) . '/config.php');
require_once($CFG->dirroot . '/mod/reactforum/lib.php');

$post_id = required_param('post', PARAM_INT);
$reaction_id = required_param('reaction', PARAM_INT);

if (!$post = $DB->get_record('reactforum_posts', array('id' => $post_id))) {
    throw new moodle_exception('error', 'mod_reactforum');
}

$discussion = $DB->get_record('reactforum_discussions', array('id' => $post->discussion), '*', MUST_EXIST);
$reactforum = $DB->get_record('reactforum', array('id' => $discussion->reactforum), '*', MUST_EXIST);
$course = $DB->get_record('course', array('id' => $reactforum->course), '*', MUST_EXIST);

$cm = get_coursemodule_from_instance('reactforum', $reactforum->id, $course->id, false, MUST_EXIST);
$context = context_module::instance($cm->id);

require_sesskey();
require_login($course, false, $cm);
require_course_login($course, true, $cm);
require_capability('mod/reactforum:viewdiscussion', $context, NULL, true, 'noviewdiscussionspermission', 'reactforum');

$return = new stdClass();

if (is_guest($context, $USER)) {
    // is_guest should be used here as this also checks whether the user is a guest in the current course.
    // Guests and visitors cannot subscribe - only enrolled users.
    throw new moodle_exception('error', 'mod_reactforum');
}

if (reactforum_user_can_see_post($reactforum, $discussion, $post, null, $cm) == false) {
    throw new moodle_exception('error', 'mod_reactforum');
}
// JLH - The following 3 lines need to be commented out to enable own post react write to db
//if ($post->userid == $USER->id) {
//    throw new moodle_exception('error', 'mod_reactforum');
//}

$userReactionObj = $DB->get_record(
    'reactforum_user_reactions',
    array(
        'post_id' => $post_id,
        'user_id' => $USER->id
    ));

if ($userReactionObj == false) {   // New record
    $userReactionObj = new stdClass();
    $userReactionObj->post_id = $post_id;
    $userReactionObj->user_id = $USER->id;
    $userReactionObj->reaction_id = $reaction_id;

    $DB->delete_records('reactforum_user_reactions', array('post_id' => $post_id, 'user_id' => $USER->id));
    $DB->insert_record('reactforum_user_reactions', $userReactionObj);
} else if (!$reactforum->delayedcounter && $userReactionObj->reaction_id == $reaction_id) {   // Remove reaction
    $DB->delete_records('reactforum_user_reactions',
        array(
            'post_id' => $post_id,
            'reaction_id' => $reaction_id,
            'user_id' => $USER->id
        ));
} else if (!$reactforum->delayedcounter) {   // Update record
    $userReactionObj->reaction_id = $reaction_id;

    $DB->update_record("reactforum_user_reactions", $userReactionObj);
}


// Get final number

$newObjArr = reactforum_get_reactions_from_discussion($discussion);

$arrayResult = array();

$postisreacted = ($DB->count_records('reactforum_user_reactions', array('post_id' => $post->id, 'user_id' => $USER->id)) > 0);
foreach ($newObjArr as $obj) {
    $count = $DB->count_records('reactforum_user_reactions', ['post_id' => $post_id, 'reaction_id' => $obj->id]);
    $usercount = $DB->count_records('reactforum_user_reactions', ['post_id' => $post_id, 'reaction_id' => $obj->id, 'user_id' => $USER->id]);

    $item = array(
        'post_id' => $post_id,
        'reaction_id' => $obj->id,
        'count' => $count,
        'reacted' => ($usercount == 1),
        'enabled' => true
    );

    if ($reactforum->delayedcounter && $post->userid != $USER->id && !$postisreacted) {
        $item['count'] = '';
    }
    if ($post->userid == $USER->id || ($reactforum->delayedcounter && $postisreacted)) {
      //  $item['enabled'] = false; // JLH - Change to below to enable button after own select
        $item['enabled'] = true;
    }

    array_push($arrayResult, $item);
}

echo json_encode(array('status' => true, 'data' => $arrayResult));