<?php
declare(strict_types = 1);
namespace Plugin\ActivityPub;
use App\Core\Event;
use App\Core\HTTPClient;
use App\Core\Log;
use App\Core\Modules\Plugin;
use App\Core\Router\RouteLoader;
use App\Core\Router\Router;
use App\Entity\Activity;
use App\Entity\Actor;
use App\Entity\LocalUser;
use App\Util\Common;
use App\Util\Exception\NicknameEmptyException;
use App\Util\Exception\NicknameException;
use App\Util\Exception\NicknameInvalidException;
use App\Util\Exception\NicknameNotAllowedException;
use App\Util\Exception\NicknameTakenException;
use App\Util\Exception\NicknameTooLongException;
use App\Util\Exception\NoSuchActorException;
use App\Util\Nickname;
use Exception;
use Plugin\ActivityPub\Controller\Inbox;
use Plugin\ActivityPub\Entity\ActivitypubActor;
use Plugin\ActivityPub\Util\Explorer;
use Plugin\ActivityPub\Util\HTTPSignature;
use Plugin\ActivityPub\Util\Model\EntityToType\EntityToType;
use Plugin\ActivityPub\Util\Response\ActorResponse;
use Plugin\ActivityPub\Util\Response\NoteResponse;
use Plugin\ActivityPub\Util\Response\TypeResponse;
use Plugin\ActivityPub\Util\Type;
use Symfony\Contracts\HttpClient\ResponseInterface;
use XML_XRD;
use XML_XRD_Element_Link;
use function count;
use const PREG_SET_ORDER;
class ActivityPub extends Plugin
{
// ActivityStreams 2.0 Accept Headers
public static array $accept_headers = [
'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'application/activity+json',
'application/json',
'application/ld+json',
];
// So that this isn't hardcoded everywhere
public const PUBLIC_TO = [
'https://www.w3.org/ns/activitystreams#Public',
'Public',
'as:Public',
];
public const HTTP_CLIENT_HEADERS = [
'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'User-Agent' => 'GNUsocialBot ' . GNUSOCIAL_VERSION . ' - ' . GNUSOCIAL_PROJECT_URL,
];
public function version(): string
{
return '3.0.0';
}
/**
* This code executes when GNU social creates the page routing, and we hook
* on this event to add our Inbox and Outbox handler for ActivityPub.
*
* @param RouteLoader $r the router that was initialized
*/
public function onAddRoute(RouteLoader $r): bool
{
$r->connect(
'activitypub_inbox',
'/inbox.json',
[Inbox::class, 'handle'],
options: ['accept' => self::$accept_headers, 'format' => self::$accept_headers[0]],
);
$r->connect(
'activitypub_actor_inbox',
'/actor/{gsactor_id<\d+>}/inbox.json',
[Inbox::class, 'handle'],
options: ['accept' => self::$accept_headers, 'format' => self::$accept_headers[0]],
);
$r->connect(
'activitypub_actor_outbox',
'/actor/{gsactor_id<\d+>}/outbox.json',
[Inbox::class, 'handle'],
options: ['accept' => self::$accept_headers, 'format' => self::$accept_headers[0]],
);
return Event::next;
}
public function onStartGetActorUrl(Actor $actor, int $type, ?string &$url):bool
{
if (
// Is remote?
!$actor->getIsLocal()
// Is in ActivityPub?
&& !is_null($ap_actor = ActivitypubActor::getWithPK(['actor_id' => $actor->getId()]))
// We can only provide a full URL (anything else wouldn't make sense)
&& $type === Router::ABSOLUTE_URL
) {
$url = $ap_actor->getUri();
return Event::stop;
}
return Event::next;
}
public function onAddFreeNetworkProtocol (array &$protocols): bool {
$protocols[] = '\Plugin\ActivityPub\ActivityPub';
return Event::next;
}
public static function freeNetworkDistribute(Actor $sender, Activity $activity, array $targets, ?string $reason = null): bool
{
$to_addr = [];
foreach($targets as $target) {
if (is_null($ap_target = ActivitypubActor::getWithPK(['actor_id' => $target->getId()]))) {
continue;
}
$to_addr[$ap_target->getInboxSharedUri() ?? $ap_target->getInboxUri()] = true;
}
$errors = [];
$to_failed = []; // TODO: Implement failed queues
foreach ($to_addr as $inbox => $dummy) {
try {
$res = self::postman($sender, EntityToType::translate($activity), $inbox);
// accummulate errors for later use, if needed
$status_code = $res->getStatusCode();
if (!($status_code === 200 || $status_code === 202 || $status_code === 409)) {
$res_body = json_decode($res->getContent(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
$to_failed[$inbox] = $activity;
}
} catch (Exception $e) {
Log::error('ActivityPub @ freeNetworkDistribute: ' . $e->getMessage());
$to_failed[$inbox] = $activity;
}
}
if (!empty($errors)) {
Log::error(sizeof($errors) . ' instance/s failed to handle the delete_profile activity!');
return false;
}
return true;
}
/**
* @param Actor $sender
* @param Type $activity
* @param string $inbox
* @param string $method
* @return ResponseInterface
*/
public static function postman(Actor $sender, mixed $activity, string $inbox, string $method = 'post'): ResponseInterface
{
$data = $activity->toJson();
Log::debug('ActivityPub Postman: Delivering ' . $data . ' to ' . $inbox);
$headers = HTTPSignature::sign($sender, $inbox, $data);
Log::debug('ActivityPub Postman: Delivery headers were: ' . print_r($headers, true));
$response = HTTPClient::$method($inbox, ['headers' => $headers, 'body' => $data]);
Log::debug('ActivityPub Postman: Delivery result with status code '.$response->getStatusCode().': '.$response->getContent());
return $response;
}
public static function getActorByUri(string $resource, ?bool $attempt_fetch = true): Actor
{
// Try local
if (Common::isValidHttpUrl($resource)) {
// This means $resource is a valid url
$resource_parts = parse_url($resource);
// TODO: Use URLMatcher
if ($resource_parts['host'] === $_ENV['SOCIAL_DOMAIN']) { // XXX: Common::config('site', 'server')) {
$str = $resource_parts['path'];
// actor_view_nickname
$renick = '/\/@(' . Nickname::DISPLAY_FMT . ')\/?/m';
// actor_view_id
$reuri = '/\/actor\/(\d+)\/?/m';
if (preg_match_all($renick, $str, $matches, PREG_SET_ORDER, 0) === 1) {
return LocalUser::getWithPK(['nickname' => $matches[0][1]])->getActor();
} elseif (preg_match_all($reuri, $str, $matches, PREG_SET_ORDER, 0) === 1) {
return Actor::getById((int) $matches[0][1]);
}
}
}
// Try remote
$aprofile = ActivitypubActor::getByAddr($resource);
if ($aprofile instanceof ActivitypubActor) {
return Actor::getById($aprofile->getActorId());
} else {
throw new NoSuchActorException("From URI: {$resource}");
}
}
/**
* @throws Exception
*/
public function onControllerResponseInFormat(string $route, array $accept_header, array $vars, ?TypeResponse &$response = null): bool
{
if (count(array_intersect(self::$accept_headers, $accept_header)) === 0) {
return Event::next;
}
switch ($route) {
case 'actor_view_id':
case 'actor_view_nickname':
$response = ActorResponse::handle($vars['actor']);
return Event::stop;
case 'note_view':
$response = NoteResponse::handle($vars['note']);
return Event::stop;
/*case 'actor_favourites_id':
case 'actor_favourites_nickname':
$response = LikeResponse::handle($vars['actor']);
return Event::stop;
case 'actor_subscriptions_id':
case 'actor_subscriptions_nickname':
$response = FollowingResponse::handle($vars['actor']);
return Event::stop;
case 'actor_subscribers_id':
case 'actor_subscribers_nickname':
$response = FollowersResponse::handle($vars['actor']);
return Event::stop;*/
default:
if (Event::handle('ActivityStreamsTwoResponse', [$route, &$response]) == Event::stop) {
return Event::stop;
}
return Event::next;
}
}
/********************************************************
* WebFinger Events *
********************************************************/
/**
* Add activity+json mimetype on WebFinger
*
* @throws Exception
*/
public function onEndWebFingerProfileLinks(XML_XRD $xrd, Actor $object): bool
{
if ($object->isPerson()) {
$link = new XML_XRD_Element_Link(
rel: 'self',
href: $object->getUri(Router::ABSOLUTE_URL),//Router::url('actor_view_id', ['id' => $object->getId()], Router::ABSOLUTE_URL),
type: 'application/activity+json',
);
$xrd->links[] = clone $link;
}
return Event::next;
}
/**
* Webfinger matches: @user@example.com or even @user--one.george_orwell@1984.biz
*
* @param string $text The text from which to extract webfinger IDs
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
* @return array The matching IDs (without $preMention) and each respective position in the given string.
*/
public static function extractWebfingerIds(string $text, string $preMention='@'): array
{
$wmatches = [];
$result = preg_match_all(
'/'.Nickname::BEFORE_MENTIONS.preg_quote($preMention, '/').'('.Nickname::WEBFINGER_FMT.')/',
$text,
$wmatches,
PREG_OFFSET_CAPTURE
);
if ($result === false) {
Log::error(__METHOD__ . ': Error parsing webfinger IDs from text (preg_last_error=='.preg_last_error().').');
return [];
} elseif (($n_matches = count($wmatches)) != 0) {
Log::debug((sprintf('Found %d matches for WebFinger IDs: %s', $n_matches, print_r($wmatches, true))));
}
return $wmatches[1];
}
/**
* Profile URL matches: @example.com/mublog/user
*
* @param string $text The text from which to extract URL mentions
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
* @return array The matching URLs (without @ or acct:) and each respective position in the given string.
*/
public static function extractUrlMentions(string $text, string $preMention='@'): array
{
$wmatches = [];
// In the regexp below we need to match / _before_ URL_REGEX_VALID_PATH_CHARS because it otherwise gets merged
// with the TLD before (but / is in URL_REGEX_VALID_PATH_CHARS anyway, it's just its positioning that is important)
$result = preg_match_all(
'/(?:^|\s+)'.preg_quote($preMention, '/').'('.URL_REGEX_DOMAIN_NAME.'(?:\/['.URL_REGEX_VALID_PATH_CHARS.']*)*)/',
$text,
$wmatches,
PREG_OFFSET_CAPTURE
);
if ($result === false) {
Log::error(__METHOD__ . ': Error parsing profile URL mentions from text (preg_last_error=='.preg_last_error().').');
return [];
} elseif (count($wmatches)) {
Log::debug((sprintf('Found %d matches for profile URL mentions: %s', count($wmatches), print_r($wmatches, true))));
}
return $wmatches[1];
}
/**
* Find any explicit remote mentions. Accepted forms:
* Webfinger: @user@example.com
* Profile link: @example.com/mublog/user
* @param Actor $sender
* @param string $text input markup text
* @param $mentions
* @return bool hook return value
*/
public function onEndFindMentions(Actor $sender, string $text, array &$mentions): bool
{
$matches = [];
foreach (self::extractWebfingerIds($text, '@') as $wmatch) {
list($target, $pos) = $wmatch;
Log::info("Checking webfinger person '$target'");
$profile = null;
try {
$aprofile = ActivitypubActor::getByAddr($target);
$profile = Actor::getById($aprofile->getActorId());
} catch (Exception $e) {
Log::error("Webfinger check failed: " . $e->getMessage());
continue;
}
assert($profile instanceof Actor);
$displayName = $profile->getFullname() ?? $profile->getNickname() ?? $target; // TODO: we could do getBestName() or getFullname() here
$matches[$pos] = [
'mentioned' => [$profile],
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $aprofile->getUri()
];
}
foreach (self::extractUrlMentions($text) as $wmatch) {
list($target, $pos) = $wmatch;
$schemes = array('https', 'http');
foreach ($schemes as $scheme) {
$url = "$scheme://$target";
Log::info("Checking profile address '$url'");
try {
$aprofile = ActivitypubActor::fromUri($url);
$profile = Actor::getById($aprofile->getActorId());
$displayName = $profile->getFullname() ?? $profile->getNickname() ?? $target; // TODO: we could do getBestName() or getFullname() here
$matches[$pos] = ['mentioned' => [$profile],
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $aprofile->getUri()
];
break;
} catch (Exception $e) {
Log::error("Profile check failed: " . $e->getMessage());
}
}
}
foreach ($mentions as $i => $other) {
// If we share a common prefix with a local user, override it!
$pos = $other['position'];
if (isset($matches[$pos])) {
$mentions[$i] = $matches[$pos];
unset($matches[$pos]);
}
}
foreach ($matches as $mention) {
$mentions[] = $mention;
}
return Event::next;
}
/**
* Allow remote profile references to be used in commands:
* sub update@status.net
* whois evan@identi.ca
* reply http://identi.ca/evan hey what's up
*
* @param Command $command
* @param string $arg
* @param Actor &$profile
* @return bool hook return code
* @author GNU social
*/
//public function onStartCommandGetProfile($command, $arg, &$profile)
//{
// $aprofile = ActivitypubActor::fromUri($arg);
// if (!($aprofile instanceof ActivitypubActor)) {
// // No remote ActivityPub profile found
// return Event::next;
// }
//
// return Event::stop;
//}
/********************************************************
* Discovery Events *
********************************************************/
/**
* Profile from URI.
*
* @author GNU social
* @param string $uri
* @param Actor &$profile in/out param: Profile got from URI
* @return mixed hook return code
*/
//public function onStartGetProfileFromURI($uri, &$profile)
//{
// try {
// $profile = Explorer::get_profile_from_url($uri);
// return Event::stop;
// } catch (Exception) {
// return Event::next; // It's not an ActivityPub profile as far as we know, continue event handling
// }
//}
/**
* Try to grab and store the remote profile by the given uri
*
* @param string $uri
* @param Actor|null &$profile
* @return bool
*/
//public function onRemoteFollowPullProfile(string $uri, ?Actor &$profile): bool
//{
// $aprofile = ActivitypubActor::fromUri($uri);
// if (!($aprofile instanceof ActivitypubActor)) {
// // No remote ActivityPub profile found
// return Event::next;
// }
//
// return is_null($profile) ? Event::next : Event::stop;
//}
}