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<?php
namespace phinde;
/**
* Handles PuSH subscription responses
*/
header('HTTP/1.0 500 Internal Server Error');
require 'www-header.php';
//PHP converts dots to underscore, so hub.mode becomes hub_mode
if (!isset($_GET['hub_mode'])) {
header('HTTP/1.0 400 Bad Request');
echo "Parameter missing: hub.mode\n";
exit(1);
}
$hubMode = $_GET['hub_mode'];
if (!isset($_GET['hub_topic'])) {
header('HTTP/1.0 400 Bad Request');
echo "Parameter missing: hub.topic\n";
exit(1);
}
if (!isValidUrl($_GET['hub_topic'])) {
header('HTTP/1.0 400 Bad Request');
echo "Invalid parameter value for hub.topic: Invalid URL\n";
exit(1);
}
$hubTopic = $_GET['hub_topic'];
$subDb = new Subscriptions();
if ($hubMode == 'denied') {
//TODO: Inspect Location header to retry subscription
//TODO: remove subscription
return;
} else if ($hubMode == 'subscribe') {
//FIXME
$pos = array_search($hubTopic, $GLOBALS['phinde']['subscriptions']);
if ($pos === false) {
//we do not want to subscribe
header('HTTP/1.0 404 Not Found');
echo "We are not interested in this hub.topic\n";
exit(1);
}
if (!isset($_GET['hub_challenge'])) {
header('HTTP/1.0 400 Bad Request');
echo "Parameter missing: hub.challenge\n";
exit(1);
}
$hubChallenge = $_GET['hub_challenge'];
if (!isset($_GET['hub_lease_seconds'])) {
header('HTTP/1.0 400 Bad Request');
echo "Parameter missing: hub.lease_seconds\n";
exit(1);
}
$hubLeaseSeconds = $_GET['hub_lease_seconds'];
//FIXME: store in database
header('HTTP/1.0 200 OK');
header('Content-type: text/plain');
echo $hubChallenge;
exit(0);
} else if ($hubMode == 'unsubscribe') {
$sub = $subDb->get($hubTopic);
if ($sub === false) {
//we do not know this subscription
header('HTTP/1.0 404 Not Found');
echo "We are not subscribed to this hub.topic\n";
exit(1);
}
$pos = array_search($hubTopic, $GLOBALS['phinde']['subscriptions']);
if ($pos !== false) {
//we do not want to unsubscribe
header('HTTP/1.0 404 Not Found');
echo "We do not want to unsubscribe from this hub.topic\n";
exit(1);
}
$sub->remove($hubTopic);
header('HTTP/1.0 200 OK');
header('Content-type: text/plain');
echo "Unsubscribed.\n";
exit(0);
} else {
header('HTTP/1.0 400 Bad Request');
echo "Invalid parameter value for hub.mode\n";
exit(1);
}
function isValidUrl($url)
{
if (filter_var($url, FILTER_VALIDATE_URL) === false) {
return false;
}
if (substr($url, 0, 7) == 'http://'
|| substr($url, 0, 8) == 'https://'
) {
return true;
}
return false;
}
?>
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