self::$channel, 'recipient' => $recip, 'success' => false, 'deliveries' => '']; switch ($cmd) { case 'permission_create': call_hooks('permissions_create', $perm_update); break; case 'permission_accept': call_hooks('permissions_accept', $perm_update); break; case 'permission_update': call_hooks('permissions_update', $perm_update); break; default: break; } if ($perm_update['success']) { if ($perm_update['deliveries']) { self::$deliveries[] = $perm_update['deliveries']; do_delivery(self::$deliveries); } return; } else { self::$recipients[] = $recip['abook_xchan']; self::$private = false; self::$packet_type = 'refresh'; self::$env_recips = [$recip['xchan_hash']]; } } } } elseif ($cmd === 'refresh_all') { logger('notifier: refresh_all: ' . $item_id); self::$channel = channelx_by_n($item_id, true); $r = q("select abook_xchan from abook where abook_channel = %d", intval($item_id) ); if ($r) { foreach ($r as $rr) { self::$recipients[] = $rr['abook_xchan']; } } // In case we deleted the channel, our abook entry has already vanished. // In order to be able to update our clones we need to add ourself here. self::$recipients[] = self::$channel['channel_hash']; self::$private = false; self::$packet_type = 'refresh'; } elseif ($cmd === 'purge') { $xchan = $argv[3]; logger('notifier: purge: ' . $item_id . ' => ' . $xchan); if (!$xchan) { return; } self::$channel = channelx_by_n($item_id, true); self::$recipients = [$xchan]; self::$private = true; self::$packet_type = 'purge'; } elseif ($cmd === 'purge_all') { logger('notifier: purge_all: ' . $item_id); self::$channel = channelx_by_n($item_id, true); self::$recipients = []; self::$private = false; self::$packet_type = 'purge'; $r = q("select abook_xchan from abook where abook_channel = %d and abook_self = 0", intval($item_id) ); if (!$r) { return; } foreach ($r as $rr) { self::$recipients[] = $rr['abook_xchan']; } } else { // Normal items // Fetch the target item self::$fragment = $argv[3] ?? ''; $r = q("SELECT * FROM item WHERE id = %d AND parent != 0", intval($item_id) ); if (!$r) { return; } xchan_query($r); $r = fetch_post_tags($r); $target_item = $r[0]; if (in_array($target_item['author']['xchan_network'], ['rss', 'anon', 'token'])) { logger('notifier: target item author is not a fetchable actor', LOGGER_DEBUG); return; } if (intval($target_item['item_deleted'])) { logger('notifier: target item ITEM_DELETED', LOGGER_DEBUG); } if (!in_array(intval($target_item['item_type']), [ITEM_TYPE_POST])) { $hookinfo = [ 'targetitem' => $target_item, 'deliver' => false ]; if (intval($target_item['item_type'] == ITEM_TYPE_CUSTOM)) { call_hooks('customitem_deliver', $hookinfo); } if (!$hookinfo['deliver']) { logger('notifier: target item not forwardable: type ' . $target_item['item_type'], LOGGER_DEBUG); return; } $target_item = $hookinfo['targetitem']; } // Check for non published items, but allow an exclusion for transmitting hidden file activities if (intval($target_item['item_unpublished']) || intval($target_item['item_delayed']) || intval($target_item['item_blocked']) || (intval($target_item['item_hidden']) && ($target_item['obj_type'] !== ACTIVITY_OBJ_FILE))) { logger('notifier: target item not published, so not forwardable', LOGGER_DEBUG); return; } // follow/unfollow is for internal use only if (in_array($target_item['verb'], [ACTIVITY_FOLLOW, ACTIVITY_UNFOLLOW])) { logger('not fowarding follow/unfollow note activity'); return; } if (strpos($target_item['postopts'], 'nodeliver') !== false) { logger('notifier: target item is undeliverable', LOGGER_DEBUG); return; } $s = q("select * from channel left join xchan on channel_hash = xchan_hash where channel_id = %d limit 1", intval($target_item['uid']) ); if ($s) { self::$channel = $s[0]; } if (self::$channel['channel_hash'] !== $target_item['author_xchan'] && self::$channel['channel_hash'] !== $target_item['owner_xchan']) { logger("notifier: Sending channel " . self::$channel['channel_hash'] . " is not owner {$target_item['owner_xchan']} or author {$target_item['author_xchan']}", LOGGER_NORMAL, LOG_WARNING); return; } if ($target_item['mid'] === $target_item['parent_mid']) { $parent_item = $target_item; $top_level_post = true; } else { // fetch the parent item $r = q("SELECT * FROM item WHERE id = %d", intval($target_item['parent']) ); if (!$r) { return; } if (strpos($r[0]['postopts'], 'nodeliver') !== false) { logger('notifier: target item is undeliverable', LOGGER_DEBUG, LOG_NOTICE); return; } xchan_query($r); $r = fetch_post_tags($r); $parent_item = $r[0]; $top_level_post = false; } // avoid looping of discover items 12/4/2014 if ($sys && $parent_item['uid'] == $sys['channel_id']) { return; } $m = get_iconfig($target_item, 'activitypub', 'signed_data'); // Re-use existing signature unless the activity type changed to a Tombstone, which won't verify. if ($m && (!intval($target_item['item_deleted']))) { self::$encoded_item = json_decode($m, true); } else { self::$encoded_item = array_merge(['@context' => [ ACTIVITYSTREAMS_JSONLD_REV, 'https://w3id.org/security/v1', z_root() . ZOT_APSCHEMA_REV ]], Activity::encode_activity($target_item) ); self::$encoded_item['signature'] = LDSignatures::sign(self::$encoded_item, self::$channel); } logger('target_item: ' . print_r($target_item, true), LOGGER_DEBUG); logger('encoded: ' . print_r(self::$encoded_item, true), LOGGER_DEBUG); // Send comments to the owner to re-deliver to everybody in the conversation // We only do this if the item in question originated on this site. This prevents looping. // To clarify, a site accepting a new comment is responsible for sending it to the owner for relay. // Relaying should never be initiated on a post that arrived from elsewhere. // We should normally be able to rely on ITEM_ORIGIN, but start_delivery_chain() incorrectly set this // flag on comments for an extended period. So we'll also call comment_local_origin() which looks at // the hostname in the message_id and provides a second (fallback) opinion. $relay_to_owner = (!$top_level_post && intval($target_item['item_origin']) && comment_local_origin($target_item)); // $cmd === 'relay' indicates the owner is sending it to the original recipients // don't allow the item in the relay command to relay to owner under any circumstances, it will loop logger('notifier: relay_to_owner: ' . (($relay_to_owner) ? 'true' : 'false'), LOGGER_DATA, LOG_DEBUG); logger('notifier: top_level_post: ' . (($top_level_post) ? 'true' : 'false'), LOGGER_DATA, LOG_DEBUG); // tag_deliver'd post which needs to be sent back to the original author if (($cmd === 'uplink') && intval($parent_item['item_uplink']) && (!$top_level_post)) { logger('notifier: uplink'); $uplink = true; self::$packet_type = 'response'; } if (($relay_to_owner || $uplink) && ($cmd !== 'relay')) { logger('notifier: followup relay', LOGGER_DEBUG); $sendto = (($uplink) ? $parent_item['source_xchan'] : $parent_item['owner_xchan']); self::$recipients = [$sendto]; self::$private = true; $upstream = true; self::$packet_type = 'response'; } else { if ($cmd === 'relay') { logger('owner relay (downstream delivery)'); } else { logger('normal (downstream) distribution', LOGGER_DEBUG); } if ($parent_item && $parent_item['item_private'] !== $target_item['item_private']) { logger('conversation privacy mismatch - downstream delivery prevented'); return; } // if our parent is a tag_delivery recipient, uplink to the original author causing // a delivery fork. if ($parent_item && intval($parent_item['item_uplink']) && !$top_level_post && $cmd !== 'uplink') { // don't uplink a relayed post to the relay owner if ($parent_item['source_xchan'] !== $parent_item['owner_xchan']) { logger('notifier: uplinking this item'); Master::Summon(['Notifier', 'uplink', $item_id]); } } self::$private = false; self::$recipients = collect_recipients($parent_item, self::$private); // FIXME add any additional recipients such as mentions, etc. if ($top_level_post) { // remove clones who will receive the post via sync self::$recipients = array_values(array_diff(self::$recipients, [$target_item['owner_xchan']])); } // don't send deletions onward for other people's stuff if (intval($target_item['item_deleted']) && (!intval($target_item['item_wall']))) { logger('notifier: ignoring delete notification for non-wall item', LOGGER_NORMAL, LOG_NOTICE); return; } } } // Generic delivery section, we have an encoded item and recipients // Now start the delivery process logger('encoded item: ' . print_r(self::$encoded_item, true), LOGGER_DATA, LOG_DEBUG); stringify_array_elms(self::$recipients); if (!self::$recipients) { logger('no recipients'); return; } // logger('recipients: ' . print_r(self::$recipients,true), LOGGER_NORMAL, LOG_DEBUG); if (!count(self::$env_recips)) { self::$env_recips = ((self::$private) ? [] : null); } $recip_list = []; $details = dbq("select xchan_hash, xchan_network, xchan_addr, xchan_guid, xchan_guid_sig from xchan where xchan_hash in (" . protect_sprintf(implode(',', self::$recipients)) . ")"); if ($details) { foreach ($details as $d) { $recip_list[] = $d['xchan_addr'] . ' (' . $d['xchan_hash'] . ')'; if (self::$private) { self::$env_recips[] = $d['xchan_hash']; } } } $narr = [ 'channel' => self::$channel, 'upstream' => $upstream, 'env_recips' => self::$env_recips, 'recipients' => self::$recipients, 'target_item' => $target_item, 'parent_item' => $parent_item, 'top_level_post' => $top_level_post, 'private' => self::$private, 'relay_to_owner' => $relay_to_owner, 'uplink' => $uplink, 'cmd' => $cmd, 'single' => ($cmd === 'single_activity'), 'normal_mode' => $normal_mode, 'packet_type' => self::$packet_type, 'queued' => [] ]; call_hooks('notifier_process', $narr); if ($narr['queued']) { foreach ($narr['queued'] as $pq) self::$deliveries[] = $pq; } // notifier_process can alter the recipient list self::$recipients = $narr['recipients']; self::$env_recips = $narr['env_recips']; if (self::$private && !self::$env_recips) { // shouldn't happen logger('notifier: private message with no envelope recipients.' . print_r($argv, true), LOGGER_NORMAL, LOG_NOTICE); return; } logger('notifier: recipients (may be delivered to more if public): ' . print_r($recip_list, true), LOGGER_DEBUG); // Now we have collected recipients (except for external mentions, FIXME) // Let's reduce this to a set of hubs; checking that the site is not dead. $hubs = dbq("select hubloc.*, site.site_crypto, site.site_flags, site.site_dead from hubloc left join site on site_url = hubloc_url where hubloc_hash in (" . protect_sprintf(implode(',', self::$recipients)) . ") and hubloc_error = 0 and hubloc_deleted = 0" ); // public posts won't make it to the local public stream unless there's a recipient on this site. // This code block sees if it's a public post and localhost is missing, and if so adds an entry for the local sys channel to the $hubs list if (!self::$private) { $found_localhost = false; if ($hubs) { foreach ($hubs as $h) { if ($h['hubloc_url'] === z_root()) { $found_localhost = true; break; } } } if (!$found_localhost) { $localhub = q("select hubloc.*, site.site_crypto, site.site_flags, site.site_dead from hubloc left join site on site_url = hubloc_url where hubloc_id_url = '%s' and hubloc_error = 0 and hubloc_deleted = 0", dbesc(z_root() . '/channel/sys') ); if ($localhub) { $hubs = array_merge($localhub, $hubs); } } } if (!$hubs) { logger('notifier: no hubs', LOGGER_NORMAL, LOG_NOTICE); return; } /** * Reduce the hubs to those that are unique. For zot hubs, we need to verify uniqueness by the sitekey, * since it may have been a re-install which has not yet been detected and pruned. * For other networks which don't have or require sitekeys, we'll have to use the URL */ $hublist = []; // this provides an easily printable list for the logs $dhubs = []; // delivery hubs where we store our resulting unique array $keys = []; // array of keys to check uniquness for zot hubs $urls = []; // array of urls to check uniqueness of hubs from other networks $hub_env = []; // per-hub envelope so we don't broadcast the entire envelope to all $dead_hosts = []; // known dead hubs - report them as undeliverable foreach ($hubs as $hub) { if (isset($hub['site_dead']) && intval($hub['site_dead'])) { if(!in_array($hub['hubloc_host'], $dead_hosts)) { $dead_hosts[] = $hub['hubloc_host']; } continue; } if (self::$env_recips) { foreach (self::$env_recips as $er) { if ($hub['hubloc_hash'] === $er) { if (!array_key_exists($hub['hubloc_site_id'], $hub_env)) { $hub_env[$hub['hubloc_site_id']] = []; } if (!in_array($er, $hub_env[$hub['hubloc_site_id']])) { $hub_env[$hub['hubloc_site_id']][] = $er; } } } } if ($hub['hubloc_network'] === 'zot6') { if (!in_array($hub['hubloc_sitekey'], $keys)) { if ($hub['hubloc_url'] === z_root()) { //deliver to local hub first array_unshift($hublist, $hub['hubloc_host'] . ' ' . $hub['hubloc_network']); array_unshift($dhubs, $hub); } else { $hublist[] = $hub['hubloc_host'] . ' ' . $hub['hubloc_network']; $dhubs[] = $hub; } $keys[] = $hub['hubloc_sitekey']; } } else { if (!in_array($hub['hubloc_url'], $urls)) { $hublist[] = $hub['hubloc_host'] . ' ' . $hub['hubloc_network']; $dhubs[] = $hub; $urls[] = $hub['hubloc_url']; } } } logger('notifier: will notify/deliver to these hubs: ' . print_r($hublist, true), LOGGER_DEBUG, LOG_DEBUG); foreach ($dhubs as $hub) { logger('notifier_hub: ' . $hub['hubloc_url'], LOGGER_DEBUG); if ($hub['hubloc_network'] !== 'zot6') { $narr = [ 'channel' => self::$channel, 'upstream' => $upstream, 'env_recips' => self::$env_recips, 'recipients' => self::$recipients, 'target_item' => $target_item, 'parent_item' => $parent_item, 'hub' => $hub, 'top_level_post' => $top_level_post, 'private' => self::$private, 'relay_to_owner' => $relay_to_owner, 'uplink' => $uplink, 'cmd' => $cmd, 'single' => $cmd === 'single_activity', 'normal_mode' => $normal_mode, 'packet_type' => self::$packet_type, 'queued' => [] ]; call_hooks('notifier_hub', $narr); if ($narr['queued']) { foreach ($narr['queued'] as $pq) self::$deliveries[] = $pq; } continue; } // singleton deliveries by definition 'not got zot'. // Single deliveries are other federated networks (plugins) and we're essentially // delivering only to those that have this site url in their abook_instance // and only from within a sync operation. This means if you post from a clone, // and a connection is connected to one of your other clones; assuming that hub // is running it will receive a sync packet. On receipt of this sync packet it // will invoke a delivery to those connections which are connected to just that // hub instance. if ($cmd === 'single_activity') { continue; } // default: zot protocol // Prevent zot6 delivery of group comment boosts, which are not required for conversational platforms. // ActivityPub conversational platforms may wish to filter these if they don't want or require them. // We will assume here that if $target_item exists and has a verb that it is an actual item structure // so we won't need to check the existence of the other item fields prior to evaluation. // This shouldn't produce false positives on comment boosts that were generated on other platforms // because we won't be delivering them. if (isset($target_item['verb']) && $target_item['verb'] === 'Announce' && $target_item['author_xchan'] === $target_item['owner_xchan'] && ! intval($target_item['item_thread_top'])) { continue; } $hash = new_uuid(); $env = $hub_env[$hub['hubloc_site_id']] ?? ''; if ((self::$private) && (!$env)) { continue; } $packet = Libzot::build_packet(self::$channel, self::$packet_type, $env, self::$encoded_item, self::$encoding, ((self::$private) ? $hub['hubloc_sitekey'] : null), $hub['site_crypto']); Queue::insert( [ 'hash' => $hash, 'account_id' => self::$channel['channel_account_id'], 'channel_id' => self::$channel['channel_id'], 'posturl' => $hub['hubloc_callback'], 'notify' => $packet, 'msg' => EMPTY_STR ] ); // only create delivery reports for normal undeleted items if (is_array($target_item) && (!$target_item['item_deleted']) && (!get_config('system', 'disable_dreport'))) { q("insert into dreport ( dreport_mid, dreport_site, dreport_recip, dreport_name, dreport_result, dreport_time, dreport_xchan, dreport_queue ) values ( '%s', '%s','%s','%s','%s','%s','%s','%s' ) ", dbesc($target_item['mid']), dbesc($hub['hubloc_host']), dbesc($hub['hubloc_host']), dbesc($hub['hubloc_host']), dbesc('queued'), dbesc(datetime_convert()), dbesc(self::$channel['channel_hash']), dbesc($hash) ); } self::$deliveries[] = $hash; } if ($normal_mode && is_array($target_item)) { // This wastes a process if there are no delivery hooks configured, so check this before launching the new process $x = q("select * from hook where hook = 'notifier_normal'"); if ($x) { Master::Summon(['Deliver_hooks', $target_item['id'], self::$fragment]); } } if (self::$deliveries) { do_delivery(self::$deliveries); } if ($dead_hosts && is_array($target_item) && (!$target_item['item_deleted']) && (!get_config('system', 'disable_dreport'))) { foreach ($dead_hosts as $deceased_host) { $r = q("insert into dreport ( dreport_mid, dreport_site, dreport_recip, dreport_name, dreport_result, dreport_time, dreport_xchan, dreport_queue ) values ( '%s', '%s','%s','%s','%s','%s','%s','%s' ) ", dbesc($target_item['mid']), dbesc($deceased_host), dbesc($deceased_host), dbesc($deceased_host), dbesc('undeliverable/unresponsive site'), dbesc(datetime_convert()), dbesc(self::$channel['channel_hash']), dbesc(new_uuid()) ); } } call_hooks('notifier_end', $target_item); logger('notifer: complete.'); return; } }