validate pdf password protection

validate pdf password protection

<?php 
error_reporting(E_ALL);
ini_set('display_errors', 1);



require_once './vendor/setasign/fpdi/pdf_parser.php'; 
if( 1 == $_GET['file'] ) {
	//file which we need to open in browser.
	$filename="pdf_sample.pdf";
	$header="Content-Disposition: inline; filename=$filename;"; // Send File Name
} else {
	//password protected file 
	$filename="pdf_sample_protected.pdf";
	$header="Content-Disposition: attachment; filename=$filename;"; // Send File Name
}
$file="./user_pdfs/$filename";

// using FPDI library 
// https://github.com/Setasign/FPDI
// check if pdf is password protected or not.
try
  {
	$pdf = new pdf_parser($file);                    
  }
  catch (Exception $e)
  {
  	if ( "File is encrypted!" == $e->getMessage() ) {
  		echo "file is encrypted";
  	} else {
  		echo "File is not encrypted";
  	}
  	exit;
  }

$len = filesize($file); // Calculate File Size
ob_clean();
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public"); 
header("Content-Description: File Transfer");
header("Content-Type:application/pdf"); // Send type of file
header($header );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$len); // Send File Size
@readfile($file);
exit;