W3 Total Cache, RackSpace Cloud Files, and Forcing Downloads [closed]

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This can be broken down to a simple task by adding a custom filter.

You will need to add the following to the _send_request method within the CF_Http class in cloudfiles_http.php line 1283.

$headers = $this->_make_headers($hdrs);
//Add this line below
$headers = apply_filters('cloudfiles_headers', $headers, $url_path, $method);

This will give you access to the headers from a plugin rather than making large edits to W3TC.

Within your plugin, you can create a function like this:

add_filter('cloudfiles_headers', 'wpse_42273_cloudfiles_headers', 0, 3);
function wpse_42273_cloudfiles_headers($headers, $url_path, $method){
    if($method != 'GET')
         return $headers;
    if(preg_match_all('~^.*/(.+\.(jpg|jpeg|png|gif|pdf|doc|docx|csv))$~i', $url_path, $matches)){
        $filename = $matches[1][0];
        $headers[] = "Content-Disposition: attachment; filename=$filename";
    }
    return $headers;
}

This will add the proper header to force the download if W3TC is fetching an object with a file extension listed in the regex above. This is a good way to control what files are served in the browser and what files have to be downloaded.

You can try this out in a plugin I created for your convenience. This may need some tweaking, but this is how I feel you should approach the issue.

Download the plugin here: http://3-3.me/K4SL

As a final note, this obviously edits the core of the W3TC plugin (though with just one line of code). This isn’t a best practice, but it will work for you. This means any upgrade will override your changes. It might be prudent to rename the plugin (create a fork on your system) so WordPress doesn’t try to update it.

Hope this helps you out!

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