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214 lines
7.6 KiB
214 lines
7.6 KiB
<?php
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use BarnabyWalters\Mf2;
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class PushTask {
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public static function verify_subscription($subscription_id, $mode) {
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$subscription = db\get_by_id('subscriptions', $subscription_id);
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if($subscription) {
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$feed = db\get_by_id('feeds', $subscription->feed_id);
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// Choose the expiration for the subscription
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$lease_seconds = 86400*7 + 3600;
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$exp_ts = time() + $lease_seconds;
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$exp_date = date('Y-m-d H:i:s', $exp_ts);
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if($subscription->namespaced) {
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$prefix = 'hub.';
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} else {
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$prefix = '';
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}
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$push_params = [
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$prefix.'mode' => ($mode == 'subscribe' ? 'subscribe' : 'unsubscribe'),
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$prefix.'topic' => $feed->feed_url,
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$prefix.'challenge' => $subscription->challenge
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];
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if($mode == 'subscribe') {
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$push_params[$prefix.'lease_seconds'] = $lease_seconds;
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}
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echo "Verifying subscription to ".$feed->feed_url." for callback ".$subscription->callback_url."\n";
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$url = parse_url($subscription->callback_url);
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if($q=k($url, 'query')) {
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parse_str($q, $existing_params);
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$push_params = array_merge($push_params, $existing_params);
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}
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$url['query'] = http_build_query($push_params);
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$url = build_url($url);
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echo "\t".$url."\n";
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$response = request\get_url($url, true);
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$subscription->challenge_response = $response['headers']."\n\n".$response['body'];
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if(request\response_is($response['status'], 2) && $response['body'] == $subscription->challenge) {
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// The subscriber replied with a 2xx status code and confirmed the challenge string.
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if($mode == 'subscribe') {
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// The subscription is confirmed and active.
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$subscription->date_confirmed = db\now();
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$subscription->lease_seconds = $lease_seconds;
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$subscription->date_expires = $exp_date;
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$subscription->active = 1;
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echo "Subscriber verified the request and is now subscribed\n";
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} else {
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$subscription->date_unsubscribed = db\now();
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$subscription->date_expires = null;
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$subscription->active = 0;
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echo "Subscriber verified the request and is now unsubscribed\n";
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}
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} else {
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// The subscriber did not confirm the subscription, so reject the request
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echo "Subscriber did not echo the challenge\n";
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}
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db\set_updated($subscription);
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$subscription->save();
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print_r($response);
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} else {
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echo "Subscription not found\n";
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}
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}
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public static function publish($feed_id) {
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$feed = db\get_by_id('feeds', $feed_id);
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if($feed) {
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echo $feed->feed_url."\n";
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echo "Checking feed for updates...\n";
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// First check the feed to see if the content has changed since the last time we checked
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$response = request\get_url($feed->feed_url, true);
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if($response['status'] != 200) {
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echo "Feed did not return HTTP 200: ".$response['status'].". Skipping publish.\n";
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return;
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}
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$feed->last_retrieved = db\now();
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db\set_updated($feed);
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$content_hash = md5($response['body']);
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if($content_hash != $feed->content_hash) {
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$feed->content_hash = $content_hash;
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$headers = request\parse_headers($response['headers']);
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if(array_key_exists('Content-Type', $headers)) {
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$feed->content_type = $headers['Content-Type'];
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}
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$feed->content = $response['body'];
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$feed->save();
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$subscribers = ORM::for_table('subscriptions')->where('feed_id', $feed->id)->where('active', 1)->find_many();
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foreach($subscribers as $s) {
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echo "Queuing notification for feed_id=$feed_id ($feed->feed_url) subscription_id=$s->id ($s->callback_url)\n";
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DeferredTask::queue('PushTask', 'notify_subscriber', [$feed_id, $s->id, db\now()]);
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}
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if(count($subscribers) == 0) {
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echo "No active subscribers\n";
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}
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} else {
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$feed->save();
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echo "Feed body has the same content hash as last time, not notifying subscribers\n";
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}
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} else {
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echo "Feed not found\n";
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}
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}
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public static function notify_subscriber($feed_id, $subscription_id, $date_queued) {
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$feed = db\get_by_id('feeds', $feed_id);
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if(!$feed) {
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echo "Feed not found\n";
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return;
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}
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$subscription = db\get_by_id('subscriptions', $subscription_id);
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if(!$subscription) {
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echo "Subscription not found\n";
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return;
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}
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// If the job was put on the queue before the last ping was sent, ignore it.
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// This happens when there is a retry job in the delayed queue, and then the
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// publisher sends a new publish request and the subscriber responds to it immediately.
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if(strtotime($date_queued) < strtotime($subscription->date_last_ping_sent)) {
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echo "Job was queued before the last ping was sent by the publisher, skipping\n";
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return;
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}
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echo "Processing subscriber: " . $subscription->callback_url . "\n";
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// Subscription may be "active" but the expiration date may have passed.
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// If so, de-activate the subscription.
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if(strtotime($subscription->date_expires) < time()) {
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echo "Subscription expired!\n";
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$subscription->active = 0;
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db\set_updated($subscription);
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$subscription->save();
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return;
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}
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echo "Notifying subscriber!\n";
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$headers = [
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'Content-Type: ' . ($feed->content_type ?: 'text/plain'),
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'Link: <' . Config::$base_url . '/>; rel="hub", <' . $feed->feed_url . '>; rel="self"',
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];
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if($subscription->secret) {
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$signature = hash_hmac('sha256', $feed->content, $subscription->secret);
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$headers[] = 'X-Hub-Signature: sha256=' . $signature;
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}
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$subscription->date_last_ping_sent = db\now();
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$response = request\post($subscription->callback_url, $feed->content, false, $headers);
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$subscription->last_ping_status = $response['status'];
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$subscription->last_ping_headers = $response['headers'];
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$subscription->last_ping_body = $response['body'];
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echo "Subscriber return a " . $response['status'] . " HTTP status\n";
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if(request\response_is($response['status'], 2)) {
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$subscription->last_ping_success = 1;
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$subscription->last_ping_error_delay = 0;
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} elseif($response['status'] == 410) {
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// If the subscriber returns HTTP 410, then take that as an indication that they no longer want more notifications and deactivate this subscription
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// https://github.com/w3c/websub/issues/106
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// https://github.com/w3c/websub/issues/103
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echo "Deactivating subscription based on HTTP 410 response returned\n";
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$subscription->last_ping_success = 0;
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$subscription->active = 0;
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} else {
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$subscription->last_ping_success = 0;
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// If the ping failed, queue another ping for a later time with exponential backoff
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if($subscription->last_ping_error_delay == 0)
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$subscription->last_ping_error_delay = 15;
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// If it's timed out after 8 tries, de-activate the subscription
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if($subscription->last_ping_error_delay > 2000) {
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echo "Ping failed after " . $subscription->last_ping_error_delay . " seconds. Deactivating this subscription.\n";
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$subscription->active = 0;
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} else {
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echo "Ping failed, trying again in " . $subscription->last_ping_error_delay . " seconds\n";
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DeferredTask::queue('PushTask', 'notify_subscriber', [$feed_id, $subscription_id, db\now()], $subscription->last_ping_error_delay);
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$subscription->last_ping_error_delay = $subscription->last_ping_error_delay * 2;
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}
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}
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db\set_updated($subscription);
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$subscription->save();
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}
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}
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