<?php
/*
Template Name: DL Processing
*/
?>

<?php get_header(); ?>

<?

$id = $_GET['dl_id'];

if ( !empty($id) ) {

	$valid_count = getDownloadCount($id);

	if ( $valid_count > 0) {
		serveFile();
	}

}

/****
*
*	Checks the download count for the corresponding file ID.
*
****/

function getDownloadCount($id) {
	$current_user = wp_get_current_user();
	$user_id = $current_user->ID;

	$download_counter = get_user_meta($user_id, 'download_count_'.$id, true);

	if ( !empty($download_counter) ) {
		return $download_counter;
	} else {
		return false;
	}
}

/****
*
*	Serve the current file ID.
*
****/

function serveFile() {

	$path = 'https://docs.google.com/uc?export=download&id=0B3o97jD7AM7lVHc3bGdoSW5sRVk'; // the file made available for download via this PHP file

	ob_start();
	header("Pragma: public");
	header("Expires: 0");
	header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
	header("Cache-Control: public");
	header("Content-Description: File Transfer");
	header("Content-Type: application/force-download");
	header("Content-Type: application/octet-stream");
	header('Content-Disposition: attachment; filename=derp.rar');
	header("Content-Transfer-Encoding: binary\n");
	ob_end_clean();

	readfile($path); // outputs the content of the file

}

?>

<?php get_footer(); ?>