mute.php

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<?php
$entity_guid = (int) get_input('entity_guid');
$recipient_guid = (int) get_input('recipient_guid');
$recipient = get_user($recipient_guid);

$muted_settings = (array) get_input('mute', []);
$hmac_token = get_input('hmac_token');

if (empty($entity_guid) || empty($recipient) || empty($muted_settings) || empty($hmac_token)) {
    return elgg_error_response(elgg_echo('error:missing_data'));
}

// hmac to ensure no data was changed between the page and the action
$hmac = elgg_build_hmac([
    'entity_guid' => $entity_guid,
    'recipient_guid' => $recipient_guid,
]);

if (!$hmac->matchesToken($hmac_token)) {
    return elgg_error_response(elgg_echo('actionunauthorized'));
}

elgg_call(ELGG_IGNORE_ACCESS, function() use ($muted_settings, $recipient_guid) {
    foreach ($muted_settings as $guid => $setting) {
        $entity = get_entity($guid);
        if (!$entity instanceof \ElggEntity) {
            continue;
        }
        
        if ($entity->hasMutedNotifications($recipient_guid) === (bool) $setting) {
            // no change in status
            continue;
        }
        
        if ((bool) $setting) {
            // mute
            $entity->muteNotifications($recipient_guid);
        } else {
            // unmute
            $entity->unmuteNotifications($recipient_guid);
        }
    }
});

return elgg_ok_response('', elgg_echo('notifications:mute:save:success'), elgg_get_site_url());