restore.php

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<?php
$guid = (int) get_input('guid');
$entity = elgg_call(ELGG_SHOW_DISABLED_ENTITIES | ELGG_SHOW_DELETED_ENTITIES, function() use ($guid) {
    return get_entity($guid);
});
if (!$entity instanceof \ElggEntity || !$entity->isDeleted()) {
    return elgg_error_response(elgg_echo('entity:restore:item_not_found'));
}

if (!$entity->canEdit()) {
    return elgg_error_response(elgg_echo('entity:restore:permission_denied'));
}

// determine what name to show on success
$display_name = $entity->getDisplayName() ?: elgg_echo('entity:restore:item');

if (!$entity->restore()) {
    return elgg_error_response(elgg_echo('entity:restore:fail', [$display_name]));
}

$success_keys = [
    "entity:restore:{$entity->type}:{$entity->subtype}:success",
    "entity:restore:{$entity->type}:success",
    'entity:restore:success',
];

$message = '';
if (get_input('show_success', true)) {
    foreach ($success_keys as $success_key) {
        if (elgg_language_key_exists($success_key)) {
            $message = elgg_echo($success_key, [$display_name]);
            break;
        }
    }
}

return elgg_ok_response('', $message);