Show a PDF files in users browser via PHP/Perl

125
votes

I want to show my users PDF files. The reason why I use cgi to show the pdf is I want to track the clicks for the pdf, and cloak the real location of the saved pdf.

I've been searching on the Internet and only found how to show save dialog to the users and creating a pdf, not show the files to the users.

What I wanted for is show the users my pdf files, not creating or download the pdf. Here is what I got form the official php documentation:

<?php
header('Content-type: application/pdf');
readfile('the.pdf');
?>

Also my google-search-result perl code:

open(PDF, "the.pdf") or die "could not open PDF [$!]";
binmode PDF;
my $output = do { local $/; <PDF> };
close (PDF);

print "Content-Type: application/pdf\n";
print "Content-Length: " .length($output) . "\n\n";
print $output

if you do it on ruby, please say it to me. But I'm not sure if my server support rails.

Sorry if my code is too far away from the method to show the pdf, since I don't know anything about pdf processing and how to implement this problem.

Lets assume that the users have the Adobe Reader plug-in. So, how to fix my problem?

edit : I want to show plain pdf file. My primary purpose: track my pdf files and use some fancy urls.

edit : Here's my main php code:

<?php
$file='/files/the.pdf';
header('Content-type: application/pdf');
header('Content-Disposition: inline; filename="the.pdf"');
@readfile($file);
?>

edit : Now the code is working. But the loading progress bar (on Adobe Reader X plugin) doesn't shows up. Why? Anyone can help me? Here's my main code:

<?php
$file='./files/the.pdf';
header('Content-type: application/pdf');
header('Content-Disposition: inline; filename="the.pdf"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . filesize($file));
@readfile($file);
?>

edit : All my problems solved. Here's the final code:

<?php
$file = './path/to/the.pdf';
$filename = 'Custom file name for the.pdf'; /* Note: Always use .pdf at the end. */

header('Content-type: application/pdf');
header('Content-Disposition: inline; filename="' . $filename . '"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . filesize($file));
header('Accept-Ranges: bytes');

@readfile($file);
?>

Thanks! :)

5
phpperlpdf
"show" is possible only if the client has the Acrobat Reader plug-in installed. Otherwise, it will always be served as a download file, there's nothing you can do about that. Obscuring the PDF's path is also impossible, it is trivial to find out. What are trying to do? Maybe there are some alternatives if we know more about your goals – Pekka
the Adobe Reader plugin is only required if you're using a browser that doesn't handle PDFs natively. also, if the PDF is sent to the browser via PHP/Perl, it is very possible to obscure the real PDF path, or even have it outside the docroot so it's not directly accessible. – Stephen
Adobe Reader is only required if the user is using a browser that doesn't handle PDFs natively... – GolezTrol
@Stephen it is of course possible to obscure the real path, but what the OP seems to be wanting is to obscure the URL to prevent theft. – Pekka
Let's assume that the users have the Adobe Reader plug-in. So, how to fix my problem? – dimassony

5 Answers

49
votes

I assume you want the PDF to display in the browser, rather than forcing a download. If that is the case, try setting the Content-Disposition header with a value of inline.

Also remember that this will also be affected by browser settings - some browsers may be configured to always download PDF files or open them in a different application (e.g. Adobe Reader)

18
votes
    $url ="https://yourFile.pdf";
    $content = file_get_contents($url);

    header('Content-Type: application/pdf');
    header('Content-Length: ' . strlen($content));
    header('Content-Disposition: inline; filename="YourFileName.pdf"');
    header('Cache-Control: private, max-age=0, must-revalidate');
    header('Pragma: public');
    ini_set('zlib.output_compression','0');

    die($content);

Tested and works fine. If you want the file to download instead, replace

    Content-Disposition: inline

with

    Content-Disposition: attachment
4
votes

You could modify a PDF renderer such as xpdf or evince to render into a graphics image on your server, and then deliver the image to the user. This is how Google's quick view of PDF files works, they render it locally, then deliver images to the user. No downloaded PDF file, and the source is pretty well obscured. :)

1
votes

The safest way to have a PDF display instead of download seems to be embedding it using an object or iframe element. There are also 3rd party solutions like Google's PDF viewer.

See Best Way to Embed PDF in HTML for an overview.

There's also DoPDF, a Java based In-browser PDF viewer. I can't speak to its quality but it looks interesting.

0
votes

You can also use fpdf class available at: http://www.fpdf.org. It gives options for both outputting to a file and displaying on browser.