The appearance of user id in that file

Started by mikcsuuu, September 26, 2021, 09:50:08 AM

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there's this code which I have

function pushfile(&$file) {
  if (isset($file["type"])) header('Content-Type: '.$file["type"]);
  if (isset($file["name"])) header('Content-Disposition: attachment; filename="'.$file["name"].'"');
  print $file["name"];
  header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
  header("Pragma: ");
  echo $file["content"];

        $content = fread($h, filesize($filename));
        $file["type"] = "application/";  //
        $file["name"] = $real_filename;
        $file["content"] = $content."*".$context['user']['id'];

This ID number was well placed into the downloaded file, but it disappeared after  converting it (e.g. from pdf to epub). Is there a good solution for that?


What exactly are you trying to do, watermark an existing document? You'll need to do something considerably more elaborate if you want to watermark a document that survives being converted between formats.

Offhand I'm not sure what that would be, since I don't know what the limits of the epub format are in terms of that - but I suppose you could rig up something using Zend_Pdf to open the PDF file, insert the userid/username as text into the document and then it would survive being converted to epub - maybe, depending on where you inserted the text.