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<?php
/**
* @package Duplicator
* @copyright (c) 2022, Snap Creek LLC
*/
namespace Duplicator\Ajax;
use DUP_Handler;
use DUP_Log;
use DUP_Util;
use Duplicator\Libs\Snap\SnapIO;
use Duplicator\Libs\Snap\SnapUtil;
use Exception;
class AjaxWrapper
{
/**
* This function wrap a callback and return always a json well formatted output.
*
* check nonce and capability if passed and return a json with this format
* [
* success : bool
* data : [
* funcData : mixed // callback return data
* message : string // a message for jvascript func (for example an exception message)
* output : string // all normal output wrapped between ob_start and ob_get_clean
* // if $errorUnespectedOutput is true and output isn't empty the json return an error
* ]
* ]
*
* @param callable $callback callback function
* @param string $nonceaction if action is null don't verify nonce
* @param string $nonce nonce string
* @param string $capability if capability is null don't verify capability
* @param bool $errorUnespectedOutput if true thorw exception with unespected optput
*
* @return void
*/
public static function json(
$callback,
$nonceaction = null,
$nonce = null,
$capability = null,
$errorUnespectedOutput = true
) {
$error = false;
$result = array(
'funcData' => null,
'output' => '',
'message' => ''
);
ob_start();
try {
DUP_Handler::init_error_handler();
$nonce = SnapUtil::sanitizeNSCharsNewline($nonce);
if (is_null($nonceaction) || !wp_verify_nonce($nonce, $nonceaction)) {
DUP_Log::trace('Security issue');
throw new Exception('Security issue');
}
if (!is_null($capability)) {
DUP_Util::hasCapability($capability, DUP_Util::SECURE_ISSUE_THROW);
}
// execute ajax function
$result['funcData'] = call_user_func($callback);
} catch (Exception $e) {
$error = true;
$result['message'] = $e->getMessage();
}
$result['output'] = ob_get_clean();
if ($errorUnespectedOutput && !empty($result['output'])) {
$error = true;
}
if ($error) {
wp_send_json_error($result);
} else {
wp_send_json_success($result);
}
}
/**
* This function wrap a callback and start a chunked file download.
* The callback must return a file path.
*
* @param callable():false|array{path:string,name:string} $callback Callback function that return a file path for download or false on error
* @param string $nonceaction if action is null don't verify nonce
* @param string $nonce nonce string
* @param bool $errorUnespectedOutput if true thorw exception with unespected optput
*
* @return never
*/
public static function fileDownload(
$callback,
$nonceaction = null,
$nonce = null,
$errorUnespectedOutput = true
) {
ob_start();
try {
DUP_Handler::init_error_handler();
$nonce = SnapUtil::sanitizeNSCharsNewline($nonce);
if (!is_null($nonceaction) && !wp_verify_nonce($nonce, $nonceaction)) {
DUP_Log::trace('Security issue');
throw new Exception('Security issue');
}
// execute ajax function
if (($fileInfo = call_user_func($callback)) === false) {
throw new Exception('Error generating file');
}
if (!@file_exists($fileInfo['path'])) {
throw new Exception('File ' . $fileInfo['path'] . ' not found');
}
$result['output'] = ob_get_clean();
if ($errorUnespectedOutput && !empty($result['output'])) {
throw new Exception('Unespected output');
}
SnapIO::serveFileForDownload($fileInfo['path'], $fileInfo['name'], DUPLICATOR_BUFFER_READ_WRITE_SIZE);
} catch (Exception $e) {
DUP_Log::trace($e->getMessage());
SnapIO::serverError500();
}
}
}