PHP force download image links all browsers. WordPress

Josh Cranwell comments:

Well that was easy.

Does it work it every browser? And file type?

Josh Cranwell comments:

I get this in safari...

[[LINK href="http://i.imgur.com/bLy0A.png"]]http://i.imgur.com/bLy0A.png[[/LINK]]

Daniel Yoen comments:

yes, for all browser(check new download.php revision), and yes for for all file type, but it would be better if the specific file type, like 'application/pdf', because 'application/octet-stream' is mean 'other' file type :-)

It's simple version, advance version have spesific file type, support partial download etc, you can see here : http://php.net/manual/en/function.readfile.php

Thank you

Daniel Yoen comments:

Ops sorry, file location is correct?

Josh Cranwell comments:

Hi,

I have other links on the page, that I want to open normally, just my links above I need to download automatically.

I also have other file types too on other download links.


Thanks

Dbranes comments:

this code pice only force download on links with the download GET parameter, fx:

http://example.com/?download=http://example.com/wp-content/uploads/2012/06/test.jpg


Here is a usage example:

<?php
$fullsize_image = wp_get_attachment_image_src( $image['id'], 'full-size' );
$large_image = wp_get_attachment_image_src( $image['id'], 'large' );
$medium_image = wp_get_attachment_image_src( $image['id'], 'medium' );

// modify this:
$download_link="http://example.com/?download=";
?>
<div class="download-buttons">
<a href="<?php echo $download_link.$fullsize_image[0]; ?>" title="Image Size: <?php echo $fullsize_image[1] . ' x ' . $fullsize_image[2]; ?>" class="download">Full Size</a>

<a href="<?php echo $download_link.$large_image[0]; ?>" title="Image Size: <?php echo $large_image[1] . ' x ' . $large_image[2]; ?>" class="download">Medium Size</a>

<a href="<?php echo $download_link.$medium_image[0]; ?>" title="Image Size: <?php echo $medium_image[1] . ' x ' . $medium_image[2]; ?>" class="download">Web Size</a>

</div>


Here is a support for jpg/gif/png

add_action('template_redirect','download_images');
function download_images() {
$download=$_GET['download'];
$download=esc_attr( $download);
if (strlen($download)>0) {
$filetype = wp_check_filetype($download);
// restriction on jpg/gif/png filetypes
if($filetype['ext']=="jpg" or $filetype['ext']=="gif" or $filetype['ext']=="png"){
header("Content-type: application/images",true,200);
header("Content-Disposition: attachment; filename=".$download);
header("Pragma: no-cache");
header("Expires: 0");
exit();
}
}
}


Dbranes comments:

ps: here is a version with

header("Content-type: ".$filetype['type'],true,200);


instead, i.e.

add_action('template_redirect','download_images');
function download_images() {
$download=$_GET['download'];
$download=esc_attr( $download);
if (strlen($download)>0) {
$filetype = wp_check_filetype($download);
// restriction on jpg/gif/png filetypes
if($filetype['ext']=="jpg" or $filetype['ext']=="gif" or $filetype['ext']=="png"){
header("Content-type: ".$filetype['type'],true,200);
header("Content-Disposition: attachment; filename=".$download);
header("Pragma: no-cache");
header("Expires: 0");
exit();
}
}
}


Josh Cranwell comments:

Very very cool.

However it renames my files. How is it doing that exactly?

Many Thanks

Josh Cranwell comments:

Also this is what I get in safari...

[[LINK href="http://i.imgur.com/2SJw1.jpg"]]http://i.imgur.com/2SJw1.jpg[[/LINK]]

Seems to work in..

Chrome: 22.0.1
FF: 16.0.2
IE: 8 and compatibly mode (have not tested 9-10 but presume they will be ok)

But Safari 5.05 i get that warning.


Thanks

Dbranes comments:

here is a version that should not rename your files
(and it only allows files from your own hostname)

add_action('template_redirect','download_images');
function download_images() {
$myhost="example.com";// <--- change this

$download=$_GET['download'];
$download=esc_attr( $download);
if (strlen($download)>0) {
$filetype = wp_check_filetype($download);
// only allow files from my own host
if(parse_url($download,PHP_URL_HOST)!=$myhost){
return;
}
//restrict filetypes to jpg/gif/png
if($filetype['ext']=="jpg" or $filetype['ext']=="gif" or $filetype['ext']=="png"){
$download_file= basename($download);
header("Content-type: ".$filetype['type'],true,200);
header("Content-Disposition: attachment; filename=".$download_file);
header("Pragma: no-cache");
header("Expires: 0");
exit();
}
}
}


Josh Cranwell comments:

Actually I've realised even with the new function that all the files that are being downloaded are <strong>Zero KB</strong>

And contain nothing, just empty files.

The renamin part works - how every nothing is actually downloading as such. Just a blank file.

Sorry my bad for not spotting this first time round.

Thanks

Dbranes comments:

This seems to work in Safari/Chrome/FF on Mac and Chrome/IE8 on PC ;-)

add_action('template_redirect','download_images');
function download_images() {
$myhost="example.com";// change this
$download=$_GET['download'];
$download=esc_attr( $download);
if (strlen($download)>0) {
$filetype = wp_check_filetype($download);
// only allow files from my own host
if(parse_url($download,PHP_URL_HOST)!=$myhost){
die("wrong host");
}
//restrict filetypes to jpg/gif/png
if($filetype['ext']=="jpg" or $filetype['ext']=="gif" or $filetype['ext']=="png"){
$download_file_name= basename($download);
header('content-type: application/octet-stream');
header("Content-Disposition: attachment; filename=".$download_file_name);
header("Pragma: no-cache");
header("Expires: 0");
readfile($download);
exit();
}
}
}


Josh Cranwell comments:

Awesome, this seems to work great!

Thanks very much!!!