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<?php
use BarnabyWalters\Mf2;
class PushTask {
public static function verify_subscription($subscription_id, $mode) {
$subscription = db\get_by_id('subscriptions', $subscription_id);
if($subscription) {
$feed = db\get_by_id('feeds', $subscription->feed_id);
// Choose the expiration for the subscription
$lease_seconds = 86400*3;
$exp_ts = time() + $lease_seconds;
$exp_date = date('Y-m-d H:i:s', $exp_ts);
$push_params = [
'hub.mode' => ($mode == 'subscribe' ? 'subscribe' : 'unsubscribe'),
'hub.topic' => $feed->feed_url,
'hub.challenge' => $subscription->challenge
];
if($mode == 'subscribe') {
$push_params['hub.lease_seconds'] = $lease_seconds;
}
$url = parse_url($subscription->callback_url);
if($q=k($url, 'query')) {
parse_str($q, $existing_params);
$push_params = array_merge($push_params, $existing_params);
}
$url['query'] = http_build_query($push_params);
$url = build_url($url);
$response = request\get_url($url, true);
$subscription->challenge_response = $response['headers']."\n\n".$response['body'];
if(request\response_is($response['status'], 2) && $response['body'] == $subscription->challenge) {
// The subscriber replied with a 2xx status code and confirmed the challenge string.
if($mode == 'subscribe') {
// The subscription is confirmed and active.
$subscription->date_confirmed = db\now();
$subscription->lease_seconds = $lease_seconds;
$subscription->date_expires = $exp_date;
$subscription->active = 1;
echo "Subscriber verified the request and is now subscribed\n";
} else {
$subscription->date_unsubscribed = db\now();
$subscription->date_expires = null;
$subscription->active = 0;
echo "Subscriber verified the request and is now unsubscribed\n";
}
} else {
// The subscriber did not confirm the subscription, so reject the request
echo "Subscriber did not echo the challenge\n";
}
db\set_updated($subscription);
$subscription->save();
print_r($response);
} else {
echo "Subscription not found\n";
}
}
public static function publish($feed_id) {
$feed = db\get_by_id('feeds', $feed_id);
if($feed) {
// First check the feed to see if the content has changed since the last time we checked
$response = request\get_url($feed->feed_url, true);
$feed->last_retrieved = db\now();
db\set_updated($feed);
$content_hash = md5($response['body']);
if($content_hash != $feed->content_hash) {
$feed->content_hash = $content_hash;
$subscribers = ORM::for_table('subscriptions')->where('feed_id', $feed->id)->where('active', 1)->find_many();
foreach($subscribers as $s) {
echo "Queuing notification for feed_id=$feed_id subscription_id=$s->id\n";
DeferredTask::queue('PushTask', 'notify_subscriber', [$feed_id, $s->id, db\now()]);
}
} else {
echo "Feed body has the same content hash as last time, not notifying subscribers\n";
}
$feed->save();
} else {
echo "Feed not found\n";
}
}
public static function notify_subscriber($feed_id, $subscription_id, $date_queued) {
$feed = db\get_by_id('feeds', $feed_id);
if(!$feed) {
echo "Feed not found\n";
return;
}
$subscription = db\get_by_id('subscriptions', $subscription_id);
if(!$subscription) {
echo "Subscription not found\n";
return;
}
// If the job was put on the queue before the last ping was sent, ignore it.
// This happens when there is a retry job in the delayed queue, and then the
// publisher sends a new publish request and the subscriber responds to it immediately.
if(strtotime($date_queued) < strtotime($subscription->date_last_ping_sent)) {
echo "Job was queued before the last ping was sent by the publisher, skipping\n";
return;
}
echo "Processing subscriber: " . $subscription->callback_url . "\n";
// Subscription may be "active" but the expiration date may have passed.
// If so, de-activate the subscription.
if(strtotime($subscription->date_expires) < time()) {
echo "Subscription expired!\n";
$subscription->active = 0;
db\set_updated($subscription);
$subscription->save();
return;
}
echo "Notifying subscriber!\n";
$subscription->date_last_ping_sent = db\now();
$response = request\post($subscription->callback_url, []);
$subscription->last_ping_status = $response['status'];
$subscription->last_ping_headers = $response['headers'];
$subscription->last_ping_body = $response['body'];
echo "Subscriber return a " . $response['status'] . " HTTP status\n";
if(request\response_is($response['status'], 2)) {
$subscription->last_ping_success = 1;
$subscription->last_ping_error_delay = 0;
} else {
$subscription->last_ping_success = 0;
// If the ping failed, queue another ping for a later time with exponential backoff
if($subscription->last_ping_error_delay == 0)
$subscription->last_ping_error_delay = 15;
// If it's timed out after 8 tries, de-activate the subscription
if($subscription->last_ping_error_delay > 2000) {
echo "Ping failed after " . $subscription->last_ping_error_delay . " seconds. Deactivating this subscription.\n";
$subscription->active = 0;
} else {
echo "Ping failed, trying again in " . $subscription->last_ping_error_delay . " seconds\n";
DeferredTask::queue('PushTask', 'notify_subscriber', [$feed_id, $subscription_id, db\now()], $subscription->last_ping_error_delay);
$subscription->last_ping_error_delay = $subscription->last_ping_error_delay * 2;
}
}
db\set_updated($subscription);
$subscription->save();
}
}