it is possible, but hard to do, in the end you have a url that is hard coded, a link that is then linked to a time web code.
it advanced code, and is possible, either by program or html/php
http://www.whatwg.org/specs/web-apps/current-work/http://www.webvamp.co.uk/blog/coding/creating-one-time-download-links/you will have to have sql with hfs and or link to index page with php...
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SQL
CREATE TABLE downloads (
downloadkey varchar(32) NOT NULL unique,
file varchar(255) NOT NULL default '',
downloads int UNSIGNED NOT NULL default '0',
expires int UNSIGNED NOT NULL default '0'
);
PHP Code
//The directory where the download files are kept - keep outside of the web document root
$strDownloadFolder = "/downloads/";
//If you can download a file more than once
$boolAllowMultipleDownload = 0;
//connect to the DB
$resDB = mysql_connect("localhost", "username", "thisismypassword");
mysql_select_db("database", $resDB);
if(!empty($_GET['key'])){
//check the DB for the key
$resCheck = mysql_query("SELECT * FROM downloads WHERE downloadkey = '".mysql_real_escape_string($_GET['key'])."' LIMIT 1");
$arrCheck = mysql_fetch_assoc($resCheck);
if(!empty($arrCheck['file'])){
//check that the download time hasnt expired
if($arrCheck['expires']>=time()){
if(!$arrCheck['downloads'] OR $boolAllowMultipleDownload){
//everything is hunky dory - check the file exists and then let the user download it
$strDownload = $strDownloadFolder.$arrCheck['file'];
if(file_exists($strDownload)){
//get the file content
$strFile = file_get_contents($strDownload);
//set the headers to force a download
header("Content-type: application/force-download");
header("Content-Disposition: attachment; filename=\"".str_replace(" ", "_", $arrCheck['file'])."\"");
//echo the file to the user
echo $strFile;
//update the DB to say this file has been downloaded
mysql_query("UPDATE downloads SET downloads = downloads + 1 WHERE downloadkey = '".mysql_real_escape_string($_GET['key'])."' LIMIT 1");
exit;
}else{
echo "We couldn't find the file to download.";
}
}else{
//this file has already been downloaded and multiple downloads are not allowed
echo "This file has already been downloaded.";
}
}else{
//this download has passed its expiry date
echo "This download has expired.";
}
}else{
//the download key given didnt match anything in the DB
echo "No file was found to download.";
}
}else{
//No download key wa provided to this script
echo "No download key was provided. Please return to the previous page and try again.";
}
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