/**
* ### Gets the full path to the filecache directory
*
* @return string
*/
function filecachedir()
{
return realpath(cachedir() . 'file/') . '/';
}
public function produce_cache_filename()
{
//
// Get the client IP address.
//
if (!isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$this->warnx("Proxy configuration error: X-Forwarded-For header not found");
return;
}
$client_ip = trim($_SERVER['HTTP_X_FORWARDED_FOR']);
if (preg_match('/^[0-9a-f:.]+$/', $client_ip) === 0) {
$this->warnx("Proxy error: invalid X-Forwarded-For header value: [{$client_ip}]");
return;
}
//
// Parse the URL and make sure it belongs to a YouTube video.
//
$url = parse_url($this->original_url);
if (!is_array($url) || !is_string($url['query'])) {
$this->warnx("Invalid URL");
return;
}
parse_str($url['query'], $p);
if (!is_array($p)) {
$this->warnx("Invalid query string: [{$url['query']}]");
return;
}
foreach (array('sver', 'itag', 'id') as $n) {
if (!is_string($p[$n]) || strlen($p[$n]) === 0) {
$this->warnx("Query parameter [{$n}] not found or empty");
return;
}
}
if (isset($p['begin'])) {
//
// The user is not downloading the whole video, but seeking within it.
// TODO How to deal with this?
// Maybe nginx's FLV module could help.
//
$this->warnx("Uncachable: begin is set: [{$p['begin']}]");
} else {
if ($p['sver'] != '3') {
//
// Stream Version?
//
// All requests seem to have this field set to the number 3.
// If this ever changes, we should look at the new requests to make
// sure that they are still compatible with this script.
//
$this->warnx("Uncachable: sver is not 3: [{$p['sver']}]");
} else {
//
// All values in $p are provided by the user.
// Do not use them directly in 'fopen()'.
//
$this->cache_filename = cachedir($this) . '/' . 'id=' . safe_filename($p['id']) . '.itag=' . safe_filename($p['itag']);
$this->log_filename = "{$this->cache_filename}." . time() . ".{$client_ip}.log";
$this->temp_cache_filename = "{$this->cache_filename}." . uniqid(mt_rand() . '_', TRUE) . ".{$client_ip}.tmp";
}
}
}
