File Sources/tasks/Likes-Notify.php

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<?php

/**
 * This task handles notifying users when something is liked.
 *
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines https://www.simplemachines.org
 * @copyright 2020 Simple Machines and individual contributors
 * @license https://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC2
 */

/**
 * Class Likes_Notify_Background
 */
class Likes_Notify_Background extends SMF_BackgroundTask
{
    /**
     * This executes the task - loads up the information, puts the email in the queue and inserts alerts as needed.
     * @return bool Always returns true
     */
    public function execute()
    {
        global $smcFunc, $sourcedir;

        $author = false;
        // We need to figure out who the owner of this is.
        if ($this->_details['content_type'] == 'msg')
        {
            $request = $smcFunc['db_query']('', '
                SELECT mem.id_member, mem.id_group, mem.id_post_group, mem.additional_groups, b.member_groups,
                    mem.pm_ignore_list
                FROM {db_prefix}messages AS m
                    INNER JOIN {db_prefix}members AS mem ON (m.id_member = mem.id_member)
                    INNER JOIN {db_prefix}boards AS b ON (m.id_board = b.id_board)
                WHERE id_msg = {int:msg}',
                array(
                    'msg' => $this->_details['content_id'],
                )
            );
            if ($row = $smcFunc['db_fetch_assoc']($request))
            {
                // Before we assign the author, let's just check that the author can see the board this is in...
                // as it'd suck to notify someone their post was liked when in a board they can't see.
                // Use an empty array if additional_groups is blank to avoid a fringe case... (see https://github.com/SimpleMachines/SMF2.1/issues/2987)
                $groups = array_merge(array($row['id_group'], $row['id_post_group']), (empty($row['additional_groups']) ? array() : explode(',', $row['additional_groups'])));
                $allowed = explode(',', $row['member_groups']);
                $ignored_members = explode(',', $row['pm_ignore_list']);

                // If the user is in group 1 anywhere, they can see everything anyway.
                if (in_array(1, $groups) || count(array_intersect($allowed, $groups)) != 0)
                    $author = $row['id_member'];
            }
            $smcFunc['db_free_result']($request);
        }
        else
        {
            // This isn't something we know natively how to support. Call the hooks, if they're dealing with it, return false, otherwise return the user id.
            $hook_results = call_integration_hook('integrate_find_like_author', array($this->_details['content_type'], $this->_details['content_id']));
            foreach ($hook_results as $result)
                if (!empty($result))
                {
                    $author = $result;
                    break;
                }
        }

        // If we didn't have a member... leave.
        if (empty($author))
            return true;

        // If the person who sent the notification is the person whose content it is, do nothing.
        if ($author == $this->_details['sender_id'])
            return true;

        // If the person who sent the notification is on this person's ignore list, do nothing.
        if (!empty($ignored_members) && in_array($this->_details['sender_id'], $ignored_members))
            return true;

        require_once($sourcedir . '/Subs-Notify.php');
        $prefs = getNotifyPrefs($author, $this->_details['content_type'] . '_like', true);

        // The likes setup doesn't support email notifications because that would be too many emails.
        // As a result, the value should really just be non empty.

        // Check the value. If no value or it's empty, they didn't want alerts, oh well.
        if (empty($prefs[$author][$this->_details['content_type'] . '_like']))
            return true;

        // Don't spam the alerts: if there is an existing unread alert of the
        // requested type for the target user from the sender, don't make a new one.
        $request = $smcFunc['db_query']('', '
            SELECT id_alert
            FROM {db_prefix}user_alerts
            WHERE id_member = {int:id_member}
                AND is_read = 0
                AND content_type = {string:content_type}
                AND content_id = {int:content_id}
                AND content_action = {string:content_action}',
            array(
                'id_member' => $author,
                'content_type' => $this->_details['content_type'],
                'content_id' => $this->_details['content_id'],
                'content_action' => 'like',
            )
        );

        if ($smcFunc['db_num_rows']($request) > 0)
            return true;
        $smcFunc['db_free_result']($request);

        // Issue, update, move on.
        $smcFunc['db_insert']('insert',
            '{db_prefix}user_alerts',
            array('alert_time' => 'int', 'id_member' => 'int', 'id_member_started' => 'int', 'member_name' => 'string',
                'content_type' => 'string', 'content_id' => 'int', 'content_action' => 'string', 'is_read' => 'int', 'extra' => 'string'),
            array($this->_details['time'], $author, $this->_details['sender_id'], $this->_details['sender_name'],
                $this->_details['content_type'], $this->_details['content_id'], 'like', 0, ''),
            array('id_alert')
        );

        updateMemberData($author, array('alerts' => '+'));

        return true;
    }
}

?>

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