CODEWITHSUNDEEP
phphtml
Diego
Diego

Reputation: 591

Force to download image from external server

  1. I want to implement a button that downloads an image uploaded in a external server.

  2. HTML 5 download attribute does work, but in FireFox and IE10 it opens the image in a new window and the user still have to use the right click to save image as.

    <a href="https://externalserver/images/image.png" download="edited_image.png">Save</a>

I can force the download using PHP if the image is located in my server.

<?php

$file = $_GET['file'];


download_file($file);

function download_file( $fullPath ){

    // Must be fresh start
    if( headers_sent() )
    die('Headers Sent');

// Required for some browsers
  if(ini_get('zlib.output_compression'))
    ini_set('zlib.output_compression', 'Off');

  // File Exists?
   if( file_exists($fullPath) ){


    // Parse Info / Get Extension
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);

    // Determine Content Type
    switch ($ext) {

      case "png": $ctype="image/png"; break;
      case "jpeg":
      case "jpg": $ctype="image/jpg"; break;
      default: $ctype="application/force-download";
    }

    header("Pragma: public"); // required
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Cache-Control: private",false); 
    header("Content-Type: $ctype");
    header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$fsize);
    ob_clean();
    flush();
    readfile( $fullPath );

  } else
    die('File Not Found');

}
?>

HTML

<a href="/php/download.php?file=image01.jpg">Download1</a>

  1. Is there a way to avoid with the HTML5 download attribute the problem to open the image in a new window in FF and IE? -Chrome works great-.

  2. Is there a way to do it with PHP but when the image is located at and external server?

It will be great to do it any way, HTML 5 or PHP. Thanks for any help. Greetings.

Upvotes: 0

Views: 3070

Answers (2)

symcbean
symcbean

Reputation: 48357

Copy it to your server and download from there.

file_put_contents($fullpath, 
    file_get_contents('https://externalserver/images/image.png'));        
header("Pragma: public"); // wtf?
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");  
// omg what have you been reading?
header("Cache-Control: private",false);  
// obviously not rfc 2616
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename=\"".basename($generatedPath)."\";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$fsize);
ob_clean();
flush();
readfile( $fullPath );

Upvotes: 1

Frederic Nault
Frederic Nault

Reputation: 996

For the php part. If you have the URL of the image you can use many approach.

An easy one would be a simple call to file_get_content to retrieve the image binary data in a variable .

After you can save it to the disk or do whatever you want with it.

Upvotes: 0

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