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https://codeberg.org/streams/streams.git
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395 lines
12 KiB
PHP
395 lines
12 KiB
PHP
<?php
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namespace Zotlabs\Module;
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// ActivityPub delivery endpoint
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use App;
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use Zotlabs\Web\HTTPSig;
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use Zotlabs\Lib\ActivityStreams;
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use Zotlabs\Lib\Activity;
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use Zotlabs\Web\Controller;
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use Zotlabs\Lib\Config;
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use Zotlabs\Lib\PConfig;
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class Inbox extends Controller {
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function post() {
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// This SHOULD be handled by the webserver, but in the RFC it is only indicated as
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// a SHOULD and not a MUST, so some webservers fail to reject appropriately.
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if ((array_key_exists('HTTP_ACCEPT',$_SERVER)) && ($_SERVER['HTTP_ACCEPT'])
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&& (strpos($_SERVER['HTTP_ACCEPT'],'*') === false) && (! ActivityStreams::is_as_request())) {
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logger('unhandled accept header: ' . $_SERVER['HTTP_ACCEPT'],LOGGER_DEBUG);
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http_status_exit(406,'not acceptable');
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}
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if (! Config::Get('system','activitypub',ACTIVITYPUB_ENABLED)) {
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logger('ActivityPub INBOX request - protocol is disabled');
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http_status_exit(404,'Not found');
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}
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$sys_disabled = ((Config::Get('system','disable_discover_tab') || Config::Get('system','disable_activitypub_discover_tab')) ? true : false);
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logger('inbox_args: ' . print_r(App::$argv,true));
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$is_public = false;
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if (argc() == 1 || argv(1) === '[public]') {
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$is_public = true;
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}
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else {
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$c = channelx_by_nick(argv(1));
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if (! $c) {
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http_status_exit(410,'Gone');
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}
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$channels = [ $c ];
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}
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$data = file_get_contents('php://input');
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if (! $data) {
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return;
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}
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logger('inbox_activity: ' . jindent($data), LOGGER_DATA);
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$hsig = HTTPSig::verify($data);
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// By convention, fediverse server-to-server communications require a valid HTTP Signature
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// which includes a signed digest header.
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// This check may need to move elsewhere or be modified in order to fully implement ActivityPub C2S.
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if (! ($hsig['header_signed'] && $hsig['header_valid'] && $hsig['content_signed'] && $hsig['content_valid'])) {
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http_status_exit(403,'Permission denied');
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}
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$AS = new ActivityStreams($data);
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if ($AS->is_valid() && $AS->type === 'Announce' && is_array($AS->obj)
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&& array_key_exists('object',$AS->obj) && array_key_exists('actor',$AS->obj)) {
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// This is a relayed/forwarded Activity (as opposed to a shared/boosted object)
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// Reparse the encapsulated Activity and use that instead
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logger('relayed activity',LOGGER_DEBUG);
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$AS = new ActivityStreams($AS->obj);
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}
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// logger('debug: ' . $AS->debug());
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if (! $AS->is_valid()) {
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if ($AS->deleted) {
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// process mastodon user deletion activities, but only if we can validate the signature
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if ($hsig['header_valid'] && $hsig['content_valid'] && $hsig['portable_id']) {
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logger('removing deleted actor');
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remove_all_xchan_resources($hsig['portable_id']);
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}
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else {
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logger('ignoring deleted actor', LOGGER_DEBUG, LOG_INFO);
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}
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}
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return;
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}
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if (is_array($AS->actor) && array_key_exists('id',$AS->actor)) {
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Activity::actor_store($AS->actor['id'],$AS->actor);
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}
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if (is_array($AS->obj) && ActivityStreams::is_an_actor($AS->obj['type'])) {
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Activity::actor_store($AS->obj['id'],$AS->obj);
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}
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if (is_array($AS->obj) && is_array($AS->obj['actor']) && array_key_exists('id',$AS->obj['actor']) && $AS->obj['actor']['id'] !== $AS->actor['id']) {
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Activity::actor_store($AS->obj['actor']['id'],$AS->obj['actor']);
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if (! check_channelallowed($AS->obj['actor']['id'])) {
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http_status_exit(403,'Permission denied');
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}
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}
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// Validate that the channel that sent us this activity has authority to do so.
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// Require a valid HTTPSignature with a signed Digest header.
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// Only permit relayed activities if the activity is signed with LDSigs
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// AND the signature is valid AND the signer is the actor.
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if ($hsig['header_valid'] && $hsig['content_valid'] && $hsig['portable_id']) {
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// fetch the portable_id for the actor, which may or may not be the sender
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$v = q("select hubloc_hash from hubloc where hubloc_id_url = '%s' or hubloc_hash = '%s'",
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dbesc($AS->actor['id']),
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dbesc($AS->actor['id'])
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);
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if ($v && $v[0]['hubloc_hash'] !== $hsig['portable_id']) {
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// The sender is not actually the activity actor, so verify the LD signature.
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// litepub activities (with no LD signature) will always have a matching actor and sender
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if ($AS->signer && is_array($AS->signer) && $AS->signer['id'] !== $AS->actor['id']) {
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// the activity wasn't signed by the activity actor
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return;
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}
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if (! $AS->sigok) {
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// The activity signature isn't valid.
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return;
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}
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}
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if ($v) {
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// The sender has been validated and stored
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$observer_hash = $hsig['portable_id'];
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}
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}
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if (! $observer_hash) {
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return;
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}
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// verify that this site has permitted communication with the sender.
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$m = parse_url($observer_hash);
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if ($m && $m['scheme'] && $m['host']) {
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if (! check_siteallowed($m['scheme'] . '://' . $m['host'])) {
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http_status_exit(403,'Permission denied');
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}
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// this site obviously isn't dead because they are trying to communicate with us.
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$test = q("update site set site_dead = 0 where site_dead = 1 and site_url = '%s' ",
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dbesc($m['scheme'] . '://' . $m['host'])
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);
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}
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if (! check_channelallowed($observer_hash)) {
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http_status_exit(403,'Permission denied');
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}
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// update the hubloc_connected timestamp, ignore failures
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$test = q("update hubloc set hubloc_connected = '%s' where hubloc_hash = '%s' and hubloc_network = 'activitypub'",
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dbesc(datetime_convert()),
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dbesc($observer_hash)
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);
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// Now figure out who the recipients are
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if ($is_public) {
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if (in_array($AS->type, [ 'Follow', 'Join' ]) && is_array($AS->obj) && ActivityStreams::is_an_actor($AS->obj['type'])) {
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$channels = q("SELECT * from channel where channel_address = '%s' and channel_removed = 0 ",
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dbesc(basename($AS->obj['id']))
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);
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}
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else {
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// deliver to anybody following $AS->actor
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$channels = q("SELECT * from channel where channel_id in ( SELECT abook_channel from abook left join xchan on abook_xchan = xchan_hash WHERE xchan_network = 'activitypub' and xchan_hash = '%s' ) and channel_removed = 0 ",
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dbesc($observer_hash)
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);
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if (! $channels) {
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$channels = [];
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}
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$parent = $AS->parent_id;
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if ($parent) {
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// this is a comment - deliver to everybody who owns the parent
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$owners = q("SELECT * from channel where channel_id in ( SELECT uid from item where mid = '%s' ) ",
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dbesc($parent)
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);
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if ($owners) {
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$channels = array_merge($channels,$owners);
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}
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}
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}
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if ($channels === false) {
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$channels = [];
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}
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if (in_array(ACTIVITY_PUBLIC_INBOX,$AS->recips)) {
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// look for channels with send_stream = PERMS_PUBLIC (accept posts from anybody on the internet)
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$r = q("select * from channel where channel_id in (select uid from pconfig where cat = 'perm_limits' and k = 'send_stream' and v = '1' ) and channel_removed = 0 ");
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if ($r) {
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$channels = array_merge($channels,$r);
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}
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// look for channels that are following hashtags. These will be checked in tgroup_check()
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$r = q("select * from channel where channel_id in (select uid from pconfig where cat = 'system' and k = 'followed_tags' and v != '' ) and channel_removed = 0 ");
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if ($r) {
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$channels = array_merge($channels,$r);
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}
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if (! $sys_disabled) {
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$channels[] = get_sys_channel();
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}
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}
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}
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// $channels represents all "potential" recipients. If they are not in this array, they will not receive the activity.
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// If they are in this array, we will decide whether or not to deliver on a case-by-case basis.
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if (! $channels) {
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logger('no deliveries on this site');
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return;
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}
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// Bto and Bcc will only be present in a C2S transaction and should not be stored.
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$saved_recips = [];
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foreach ( [ 'to', 'cc', 'audience' ] as $x ) {
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if (array_key_exists($x,$AS->data)) {
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$saved_recips[$x] = $AS->data[$x];
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}
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}
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$AS->set_recips($saved_recips);
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foreach ($channels as $channel) {
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if (! PConfig::Get($channel['channel_id'],'system','activitypub',Config::Get('system','activitypub',ACTIVITYPUB_ENABLED))) {
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continue;
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}
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logger('inbox_channel: ' . $channel['channel_address'],LOGGER_DEBUG);
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switch ($AS->type) {
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case 'Follow':
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if (is_array($AS->obj) && array_key_exists('type', $AS->obj) && ActivityStreams::is_an_actor($AS->obj['type'])) {
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// do follow activity
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Activity::follow($channel,$AS);
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}
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break;
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case 'Invite':
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if (is_array($AS->obj) && array_key_exists('type', $AS->obj) && $AS->obj['type'] === 'Group') {
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// do follow activity
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Activity::follow($channel,$AS);
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}
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break;
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case 'Join':
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if (is_array($AS->obj) && array_key_exists('type', $AS->obj) && $AS->obj['type'] === 'Group') {
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// do follow activity
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Activity::follow($channel,$AS);
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}
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break;
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case 'Accept':
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// Activitypub for wordpress sends lowercase 'follow' on accept.
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// https://github.com/pfefferle/wordpress-activitypub/issues/97
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// Mobilizon sends Accept/"Member" (not in vocabulary) in response to Join/Group
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if (is_array($AS->obj) && array_key_exists('type', $AS->obj) && in_array($AS->obj['type'], ['Follow','follow', 'Member'])) {
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// do follow activity
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Activity::follow($channel,$AS);
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}
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break;
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case 'Reject':
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default:
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break;
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}
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// These activities require permissions
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$item = null;
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switch ($AS->type) {
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case 'Update':
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if (is_array($AS->obj) && array_key_exists('type',$AS->obj) && ActivityStreams::is_an_actor($AS->obj['type'])) {
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// pretend this is an old cache entry to force an update of all the actor details
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$AS->obj['cached'] = true;
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$AS->obj['updated'] = datetime_convert('UTC','UTC','1980-01-01', ATOM_TIME);
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Activity::actor_store($AS->obj['id'],$AS->obj);
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break;
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}
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case 'Accept':
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if (is_array($AS->obj) && array_key_exists('type',$AS->obj) && (ActivityStreams::is_an_actor($AS->obj['type']) || $AS->obj['type'] === 'Member')) {
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break;
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}
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case 'Create':
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case 'Like':
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case 'Dislike':
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case 'Announce':
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case 'Reject':
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case 'TentativeAccept':
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case 'TentativeReject':
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case 'Add':
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case 'Arrive':
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case 'Block':
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case 'Flag':
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case 'Ignore':
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case 'Invite':
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case 'Listen':
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case 'Move':
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case 'Offer':
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case 'Question':
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case 'Read':
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case 'Travel':
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case 'View':
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case 'emojiReaction':
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case 'EmojiReaction':
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case 'EmojiReact':
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// These require a resolvable object structure
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if (is_array($AS->obj)) {
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// The boolean flag enables html cache of the item
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$item = Activity::decode_note($AS,true);
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}
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else {
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logger('unresolved object: ' . print_r($AS->obj,true));
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}
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break;
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case 'Undo':
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if ($AS->obj && is_array($AS->obj) && array_key_exists('type', $AS->obj) && $AS->obj['type'] === 'Follow') {
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// do unfollow activity
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Activity::unfollow($channel,$AS);
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break;
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}
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case 'Leave':
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if ($AS->obj && is_array($AS->obj) && array_key_exists('type', $AS->obj) && $AS->obj['type'] === 'Group') {
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// do unfollow activity
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Activity::unfollow($channel,$AS);
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break;
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}
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case 'Tombstone':
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case 'Delete':
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Activity::drop($channel,$observer_hash,$AS);
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break;
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case 'Move':
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if($observer_hash && $observer_hash === $AS->actor
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&& is_array($AS->obj) && array_key_exists('type', $AS->obj) && ActivityStream::is_an_actor($AS->obj['type'])
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&& is_array($AS->tgt) && array_key_exists('type', $AS->tgt) && ActivityStream::is_an_actor($AS->tgt['type'])) {
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ActivityPub::move($AS->obj,$AS->tgt);
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}
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break;
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case 'Add':
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case 'Remove':
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default:
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break;
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}
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if ($item) {
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logger('parsed_item: ' . print_r($item,true),LOGGER_DATA);
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Activity::store($channel,$observer_hash,$AS,$item);
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}
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}
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http_status_exit(200,'OK');
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}
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function get() {
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}
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}
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