File security PDF qpdf binary

Specifies the path to the qpdf binary used during PDF security scanning. When a valid executable path is returned, it takes precedence over the auto-detected paths (/usr/bin/qpdf, /usr/local/bin/qpdf, /opt/homebrew/bin/qpdf).

If no path is provided or the path is not executable, Forms falls back to the auto-detection candidates. qpdf is used to decompress object streams in PDFs before scanning for dangerous dictionary keys.

\add_filter('es_forms_validation_file_security_pdf_qpdf_binary', [$this, 'fileSecurityPdfQpdfBinary']);

/**
 * Provide the path to the qpdf binary.
 *
 * @return string
 */
public function fileSecurityPdfQpdfBinary(): string
{
	return '/custom/path/to/qpdf';
}