gnu-social/plugins/ActivityPub/ActivityPubPlugin.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* ActivityPub implementation for GNU social
*
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
* @link http://www.gnu.org/software/social/
*/
defined('GNUSOCIAL') || die();
// Import plugin libs
foreach (glob(__DIR__ . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . '*.php') as $filename) {
require_once $filename;
}
// Import plugin models
foreach (glob(__DIR__ . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'models' . DIRECTORY_SEPARATOR . '*.php') as $filename) {
require_once $filename;
}
// So that this isn't hardcoded everywhere
const ACTIVITYPUB_PUBLIC_TO = ['https://www.w3.org/ns/activitystreams#Public',
'Public',
'as:Public'
];
const ACTIVITYPUB_HTTP_CLIENT_HEADERS = [
'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'User-Agent: GNUsocialBot ' . GNUSOCIAL_VERSION . ' - https://gnusocial.rocks'
];
/**
* Adds ActivityPub support to GNU social when enabled
*
* @category Plugin
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class ActivityPubPlugin extends Plugin
{
const PLUGIN_VERSION = '0.4.0alpha0';
/**
* Returns a Actor's URI from its local $profile
* Works both for local and remote users.
* This is a discovery event but it seems more logical to have it separated.
* This ensures that Profile->getUri() will always return the intended for a remote AP profile.
*
* @param Profile $profile Actor's local profile
* @param string &$uri I/O Actor's URI
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @return bool event hook
*/
public function onStartGetProfileUri(Profile $profile, &$uri): bool
{
$aprofile = Activitypub_profile::getKV('profile_id', $profile->id);
if ($aprofile instanceof Activitypub_profile) {
$uri = $aprofile->getUri();
return false;
}
return true;
}
/**
* Returns a notice from its URL.
*
* @param string $url Notice's URL
* @param bool $grab_online whether to try online grabbing, defaults to true
* @return Notice|null The Notice object
* @throws Exception This function or provides a Notice, null, or fails with exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function grab_notice_from_url(string $url, bool $grab_online = true): ?Notice
{
/* Offline Grabbing */
try {
// Look for a known remote notice
return Notice::getByUri($url);
} catch (Exception $e) {
// Look for a local notice (unfortunately GNU social doesn't
// provide this functionality natively)
try {
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$candidate = Notice::getByID((int)substr($url, (strlen(Activitypub_notice::note_uri(0))-1)));
if (Activitypub_notice::note_uri($candidate->getID()) === $url) { // Sanity check
return $candidate;
} else {
common_debug('ActivityPubPlugin Notice Grabber: '.$candidate->getUrl(). ' is different of '.$url);
}
} catch (Exception $e) {
common_debug('ActivityPubPlugin Notice Grabber: failed to find: '.$url.' offline.');
}
}
if ($grab_online) {
/* Online Grabbing */
$client = new HTTPClient();
$response = $client->get($url, ACTIVITYPUB_HTTP_CLIENT_HEADERS);
$object = json_decode($response->getBody(), true);
if (Activitypub_notice::validate_note($object)) {
// Okay, we've found a valid note object!
// Now we need to find the Actor who authored it
// The right way would be to grab attributed to and check its outbox
// But that would be outright inefficient
// Hence, let's just compare the domain names...
if (isset($object['attributedTo'])) {
$acclaimed_actor_profile = ActivityPub_explorer::get_profile_from_url($object['attributedTo']);
} elseif (isset($object['actor'])) {
$acclaimed_actor_profile = ActivityPub_explorer::get_profile_from_url($object['actor']);
} else {
throw new Exception("A notice can't be created without an actor.");
}
if (parse_url($acclaimed_actor_profile->getUri(), PHP_URL_HOST) == parse_url($object['id'], PHP_URL_HOST)) {
return Activitypub_notice::create_notice($object, $acclaimed_actor_profile);
} else {
throw new Exception("The acclaimed actor didn't create this note.");
}
} else {
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throw new Exception("Invalid Note Object. Maybe it's a Tombstone?");
}
}
common_debug('ActivityPubPlugin Notice Grabber: failed to find: '.$url);
return null;
}
/**
* Route/Reroute urls
*
* @param URLMapper $m
* @return void
* @throws Exception
*/
public function onRouterInitialized(URLMapper $m)
{
$acceptHeaders = [
'application/ld+json; profile="https://www.w3.org/ns/activitystreams"' => 0,
'application/activity+json' => 1,
'application/json' => 2,
'application/ld+json' => 3
];
$m->connect(
'user/:id',
['action' => 'apActorProfile'],
['id' => '[0-9]+'],
true,
$acceptHeaders
);
$m->connect(
':nickname',
['action' => 'apActorProfile'],
['nickname' => Nickname::DISPLAY_FMT],
true,
$acceptHeaders
);
$m->connect(
':nickname/',
['action' => 'apActorProfile'],
['nickname' => Nickname::DISPLAY_FMT],
true,
$acceptHeaders
);
// v3
$m->connect(
'activity/:id',
['action' => 'apNotice'],
['id' => '[0-9]+'],
);
// v2
$m->connect(
'notice/:id',
['action' => 'apNotice'],
['id' => '[0-9]+'],
true,
$acceptHeaders
);
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$m->connect(
'object/note/:id',
['action' => 'apNotice'],
['id' => '[0-9]+'],
);
$m->connect(
'user/:id/liked.json',
['action' => 'apActorLiked'],
['id' => '[0-9]+']
);
$m->connect(
'user/:id/followers.json',
['action' => 'apActorFollowers'],
['id' => '[0-9]+']
);
$m->connect(
'user/:id/following.json',
['action' => 'apActorFollowing'],
['id' => '[0-9]+']
);
$m->connect(
'user/:id/inbox.json',
['action' => 'apInbox'],
['id' => '[0-9]+']
);
$m->connect(
'user/:id/outbox.json',
['action' => 'apActorOutbox'],
['id' => '[0-9]+']
);
$m->connect(
'inbox.json',
['action' => 'apInbox']
);
}
/**
* Plugin version information
*
* @param array $versions
* @return bool hook true
*/
public function onPluginVersion(array &$versions): bool
{
$versions[] = [
'name' => 'ActivityPub',
'version' => self::PLUGIN_VERSION,
'author' => 'Diogo Cordeiro',
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'homepage' => 'https://notabug.org/diogo/gnu-social/src/nightly/plugins/ActivityPub',
// TRANS: Plugin description.
'rawdescription' => _m('Follow people across social networks that implement '.
'<a href="https://activitypub.rocks/">ActivityPub</a>.')
];
return true;
}
/**
* Set up queue handlers for required interactions
*
* @param QueueManager $qm
* @return bool event hook return
*/
public function onEndInitializeQueueManager(QueueManager $qm): bool
{
// Notice distribution
$qm->connect('activitypub', 'ActivityPubQueueHandler');
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// Failed Notice distribution
$qm->connect('activitypub_failed', 'ActivityPubFailedQueueHandler');
return true;
}
/**
* Enqueue saved notices for distribution
*
* @param Notice $notice notice to be distributed
* @param Array &$transports list of transports to queue for
* @return bool event hook return
*/
public function onStartEnqueueNotice(Notice $notice, array &$transports): bool
{
try {
$id = $notice->getID();
if ($id > 0) {
$transports[] = 'activitypub';
$this->log(LOG_INFO, "Notice:{$id} queued for distribution");
}
} catch (Exception $e) {
$this->log(LOG_ERR, "Invalid notice, not queueing for distribution");
}
return true;
}
/**
* Update notice before saving.
* We'll use this as a hack to maintain replies to unlisted/followers-only
* notices away from the public timelines.
*
* @param Notice &$notice notice to be saved
* @return bool event hook return
*/
public function onStartNoticeSave(Notice &$notice): bool
{
if ($notice->reply_to) {
try {
$parent = $notice->getParent();
$is_local = (int)$parent->is_local;
// if we're replying unlisted/followers-only notices received by AP
// or replying to replies of such notices, then we make sure to set
// the correct type flag.
if (($parent->source === 'ActivityPub' && $is_local === Notice::GATEWAY) ||
($parent->source === 'web' && $is_local === Notice::LOCAL_NONPUBLIC)) {
$this->log(LOG_INFO, "Enforcing type flag LOCAL_NONPUBLIC for new notice");
$notice->is_local = Notice::LOCAL_NONPUBLIC;
}
} catch (NoParentNoticeException $e) {
// This is not a reply to something (has no parent)
}
}
return true;
}
/**
* Add AP-subscriptions for private messaging
*
* @param User $current current logged user
* @param array &$recipients
* @return void
*/
public function onFillDirectMessageRecipients(User $current, array &$recipients): void
{
try {
$subs = Activitypub_profile::getSubscribed($current->getProfile());
foreach ($subs as $sub) {
if (!$sub->isLocal()) { // AP plugin adds AP users
try {
$value = 'profile:'.$sub->getID();
$recipients[$value] = substr($sub->getAcctUri(), 5) . " [{$sub->getBestName()}]";
} catch (ProfileNoAcctUriException $e) {
$recipients[$value] = "[?@?] " . $e->profile->getBestName();
}
}
}
} catch (NoResultException $e) {
// let it go
}
}
/**
* Validate AP-recipients for profile page message action addition
*
* @param Profile $recipient
* @return bool hook return value
*/
public function onDirectMessageProfilePageActions(Profile $recipient): bool
{
$to = Activitypub_profile::getKV('profile_id', $recipient->getID());
if ($to instanceof Activitypub_profile) {
return false; // we can validate this profile, signal it
}
return true;
}
/**
* Mark an ap_profile object for deletion
*
* @param Profile profile being deleted
* @param array &$related objects with same profile_id to be deleted
* @return void
*/
public function onProfileDeleteRelated(Profile $profile, array &$related): void
{
$related[] = 'Activitypub_profile';
$related[] = 'Activitypub_rsa';
// pending_follow_requests doesn't have a profile_id column,
// so we must handle it manually
$follow = new Activitypub_pending_follow_requests(null, $profile->getID());
if ($follow->find()) {
while ($follow->fetch()) {
$follow->delete();
}
}
}
/**
* Plugin Nodeinfo information
*
* @param array $protocols
* @return bool hook true
*/
public function onNodeInfoProtocols(array &$protocols)
{
$protocols[] = "activitypub";
return true;
}
/**
* Adds an indicator on Remote ActivityPub profiles.
*
* @param HTMLOutputter $out
* @param Profile $profile
* @return boolean hook return value
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onEndShowAccountProfileBlock(HTMLOutputter $out, Profile $profile)
{
if ($profile->isLocal()) {
return true;
}
$aprofile = Activitypub_profile::getKV('profile_id', $profile->getID());
if (!$aprofile instanceof Activitypub_profile) {
// Not a remote ActivityPub_profile! Maybe some other network
// that has imported a non-local user (e.g.: OStatus)?
return true;
}
$out->elementStart('dl', 'entity_tags activitypub_profile');
$out->element('dt', null, 'ActivityPub');
$out->element('dd', null, _m('Remote Profile'));
$out->elementEnd('dl');
return true;
}
/**
* Hack the notice search-box and try to grab remote profiles or notices.
*
* Note that, on successful grabbing, this function will redirect to the
* new profile/notice, so URL searching is directly affected. A good solution
* for this is to store the URLs in the notice text without the https/http
* prefixes. This would change the queries for URL searching and therefore we
* could do both search and grab.
*
* @param string $query search query
* @return bool hook
* @author Bruno Casteleiro <up201505347@fc.up.pt>
*/
public function onStartNoticeSearch(string $query): bool
{
if (!common_logged_in()) {
// early return: Only allow logged users to import/search for remote actors or notes
return true;
}
if (preg_match('!^((?:\w+\.)*\w+@(?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+)$!', $query)) { // WebFinger ID found!
// Try to grab remote actor
$aprofile = self::pull_remote_profile($query);
if ($aprofile instanceof Activitypub_profile) {
$url = common_local_url('userbyid', ['id' => $aprofile->getID()], null, null, false);
common_redirect($url, 303);
return false;
}
} elseif (filter_var($query, FILTER_VALIDATE_URL)) { // URL found!
/* Is this an ActivityPub notice? */
// If we already know it, just return
try {
$notice = self::grab_notice_from_url($query, false); // Only check locally
if ($notice instanceof Notice) {
return true;
}
} catch (Exception $e) {
// We will next try online
}
// Otherwise, try to grab it
try {
$notice = self::grab_notice_from_url($query); // Unfortunately we will be trying locally again
if ($notice instanceof Notice) {
$url = common_local_url('shownotice', ['notice' => $notice->getID()]);
common_redirect($url, 303);
}
} catch (Exception $e) {
// We will next check if this URL is an actor
}
/* Is this an ActivityPub actor? */
// If we already know it, just return
try {
$explorer = new Activitypub_explorer();
$profile = $explorer->lookup($query, false)[0]; // Only check locally
if ($profile instanceof Profile) {
return true;
}
} catch (Exception $e) {
// We will next try online
}
// Try to grab remote actor
try {
if (!isset($explorer)) {
$explorer = new Activitypub_explorer();
}
$profile = $explorer->lookup($query)[0]; // Unfortunately we will be trying locally again
if ($profile instanceof Profile) {
$url = common_local_url('userbyid', ['id' => $profile->getID()], null, null, false);
common_redirect($url, 303);
return true;
}
} catch (Exception $e) {
// Let the search run naturally
}
}
return true;
}
/**
* Make sure necessary tables are filled out.
*
* @return bool hook true
*/
public function onCheckSchema()
{
$schema = Schema::get();
$schema->ensureTable('activitypub_profile', Activitypub_profile::schemaDef());
$schema->ensureTable('activitypub_rsa', Activitypub_rsa::schemaDef());
$schema->ensureTable('activitypub_pending_follow_requests', Activitypub_pending_follow_requests::schemaDef());
return true;
}
/********************************************************
* WebFinger Events *
********************************************************/
/**
* Get remote user's ActivityPub_profile via a identifier
*
* @param string $arg A remote user identifier
* @return Activitypub_profile|null Valid profile in success | null otherwise
* @author GNU social
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function pull_remote_profile($arg)
{
if (preg_match('!^((?:\w+\.)*\w+@(?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+)$!', $arg)) {
// webfinger lookup
try {
return Activitypub_profile::ensure_webfinger($arg);
} catch (Exception $e) {
common_log(LOG_ERR, 'Webfinger lookup failed for ' .
$arg . ': ' . $e->getMessage());
}
}
// Look for profile URLs, with or without scheme:
$urls = [];
if (preg_match('!^https?://((?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+(?:/\w+)+)$!', $arg)) {
$urls[] = $arg;
}
if (preg_match('!^((?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+(?:/\w+)+)$!', $arg)) {
$schemes = array('http', 'https');
foreach ($schemes as $scheme) {
$urls[] = "$scheme://$arg";
}
}
foreach ($urls as $url) {
try {
return Activitypub_profile::fromUri($url);
} catch (Exception $e) {
common_log(LOG_ERR, 'Profile lookup failed for ' .
$arg . ': ' . $e->getMessage());
}
}
return null;
}
/**
* Webfinger matches: @user@example.com or even @user--one.george_orwell@1984.biz
*
* @author GNU social
* @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 $preMention) and each respective position in the given string.
*/
public static function extractWebfingerIds($text, $preMention='@')
{
$wmatches = [];
$result = preg_match_all(
'/(?<!\S)'.preg_quote($preMention, '/').'('.Nickname::WEBFINGER_FMT.')/',
$text,
$wmatches,
PREG_OFFSET_CAPTURE
);
if ($result === false) {
common_log(LOG_ERR, __METHOD__ . ': Error parsing webfinger IDs from text (preg_last_error=='.preg_last_error().').');
return [];
} elseif (($n_matches = count($wmatches)) != 0) {
common_debug(sprintf('Found %d matches for WebFinger IDs: %s', $n_matches, _ve($wmatches)));
}
return $wmatches[1];
}
/**
* Profile URL matches: @example.com/mublog/user
*
* @author GNU social
* @param string $text The text from which to extract URL mentions
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
* @return array The matching URLs (without @ or acct:) and each respective position in the given string.
*/
public static function extractUrlMentions($text, $preMention='@')
{
$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) {
common_log(LOG_ERR, __METHOD__ . ': Error parsing profile URL mentions from text (preg_last_error=='.preg_last_error().').');
return [];
} elseif (count($wmatches)) {
common_debug(sprintf('Found %d matches for profile URL mentions: %s', count($wmatches), _ve($wmatches)));
}
return $wmatches[1];
}
/**
* Add activity+json mimetype on WebFinger
*
* @param XML_XRD $xrd
* @param Managed_DataObject $object
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onEndWebFingerProfileLinks(XML_XRD $xrd, Managed_DataObject $object)
{
if ($object->isPerson()) {
$link = new XML_XRD_Element_Link(
'self',
$object->getProfile()->getUri(),
'application/activity+json'
);
$xrd->links[] = clone($link);
}
}
/**
* Find any explicit remote mentions. Accepted forms:
* Webfinger: @user@example.com
* Profile link:
* @param Profile $sender
* @param string $text input markup text
* @param $mentions
* @return boolean hook return value
* @throws InvalidUrlException
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @example.com/mublog/user
*
* @author GNU social
*/
public function onEndFindMentions(Profile $sender, $text, &$mentions)
{
$matches = [];
foreach (self::extractWebfingerIds($text, '@') as $wmatch) {
list($target, $pos) = $wmatch;
$this->log(LOG_INFO, "Checking webfinger person '$target'");
$profile = null;
try {
$aprofile = Activitypub_profile::ensure_webfinger($target);
$profile = $aprofile->local_profile();
} catch (Exception $e) {
$this->log(LOG_ERR, "Webfinger check failed: " . $e->getMessage());
continue;
}
assert($profile instanceof Profile);
$displayName = !empty($profile->nickname) && mb_strlen($profile->nickname) < mb_strlen($target)
? $profile->getNickname() // TODO: we could do getBestName() or getFullname() here
: $target;
$url = $profile->getUri();
if (!common_valid_http_url($url)) {
$url = $profile->getUrl();
}
$matches[$pos] = array('mentioned' => array($profile),
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $url);
}
foreach (self::extractUrlMentions($text) as $wmatch) {
list($target, $pos) = $wmatch;
$schemes = array('https', 'http');
foreach ($schemes as $scheme) {
$url = "$scheme://$target";
$this->log(LOG_INFO, "Checking profile address '$url'");
try {
$aprofile = Activitypub_profile::fromUri($url);
$profile = $aprofile->local_profile();
$displayName = !empty($profile->nickname) && mb_strlen($profile->nickname) < mb_strlen($target) ?
$profile->nickname : $target;
$matches[$pos] = array('mentioned' => array($profile),
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $profile->getUrl());
break;
} catch (Exception $e) {
$this->log(LOG_ERR, "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 true;
}
/**
* 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 $arg
* @param Profile &$profile
* @return boolean hook return code
* @author GNU social
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onStartCommandGetProfile($command, $arg, &$profile)
{
$aprofile = self::pull_remote_profile($arg);
if ($aprofile instanceof Activitypub_profile) {
$profile = $aprofile->local_profile();
} else {
// No remote ActivityPub profile found
return true;
}
return false;
}
/********************************************************
* Discovery Events *
********************************************************/
/**
* Profile from URI.
*
* @author GNU social
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param string $uri
* @param Profile &$profile in/out param: Profile got from URI
* @return mixed hook return code
*/
public function onStartGetProfileFromURI($uri, &$profile)
{
try {
$profile = Activitypub_explorer::get_profile_from_url($uri);
return false;
} catch (Exception $e) {
return true; // 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 $uri
* @param Profile &$profile
* @return bool
*/
public function onRemoteFollowPullProfile(string $uri, ?Profile &$profile): bool
{
$aprofile = self::pull_remote_profile($uri);
if ($aprofile instanceof Activitypub_profile) {
$profile = $aprofile->local_profile();
} else {
// No remote ActivityPub profile found
return true;
}
return is_null($profile);
}
/********************************************************
* Delivery Events *
********************************************************/
/**
* Having established a remote subscription, send a notification to the
* remote ActivityPub profile's endpoint.
*
* @param Profile $profile subscriber
* @param Profile $other subscribee
* @return bool return value
* @throws HTTP_Request2_Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onStartSubscribe(Profile $profile, Profile $other)
{
if (!$profile->isLocal()) {
return true;
}
$other = Activitypub_profile::getKV('profile_id', $other->getID());
if (!$other instanceof Activitypub_profile) {
return true;
}
$postman = new Activitypub_postman($profile, [$other]);
$postman->follow();
return true;
}
/**
* Notify remote server on unsubscribe.
*
* @param Profile $profile
* @param Profile $other
* @return bool return value
* @throws HTTP_Request2_Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onStartUnsubscribe(Profile $profile, Profile $other)
{
if (!$profile->isLocal()) {
return true;
}
$other = Activitypub_profile::getKV('profile_id', $other->getID());
if (!$other instanceof Activitypub_profile) {
return true;
}
$postman = new Activitypub_postman($profile, [$other]);
$postman->undo_follow();
return true;
}
/**
* Notify remote users when their notices get de-favourited.
*
* @param Profile $profile of local user doing the de-faving
* @param Notice $notice Notice being favored
* @return bool return value
* @throws HTTP_Request2_Exception
* @throws InvalidUrlException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onEndDisfavorNotice(Profile $profile, Notice $notice)
{
// Only distribute local users' favor actions, remote users
// will have already distributed theirs.
if (!$profile->isLocal()) {
return true;
}
$other = [];
try {
$other[] = Activitypub_profile::from_profile($notice->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
$other = array_merge(
$other,
Activitypub_profile::from_profile_collection(
$notice->getAttentionProfiles()
)
);
if ($notice->reply_to) {
try {
$parent_notice = $notice->getParent();
try {
$other[] = Activitypub_profile::from_profile($parent_notice->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
$other = array_merge(
$other,
Activitypub_profile::from_profile_collection(
$parent_notice->getAttentionProfiles()
)
);
} catch (NoParentNoticeException $e) {
// This is not a reply to something (has no parent)
} catch (NoResultException $e) {
// Parent author's profile not found! Complain louder?
common_log(LOG_ERR, "Parent notice's author not found: ".$e->getMessage());
}
}
$postman = new Activitypub_postman($profile, $other);
$postman->undo_like($notice);
return true;
}
/**
* Notify remote followers when a user gets deleted
*
* @param Action $action
* @param User $user user being deleted
*/
public function onEndDeleteUser(Action $action, User $user): void
{
$deleted_profile = $user->getProfile();
$postman = new Activitypub_postman($deleted_profile);
$postman->delete_profile($deleted_profile);
}
/**
* Federate private message
*
* @param Notice $message
* @return void
*/
public function onSendDirectMessage(Notice $message): void
{
$from = $message->getProfile();
if (!$from->isLocal()) {
// nothing to do
return;
}
$to = Activitypub_profile::from_profile_collection(
$message->getAttentionProfiles()
);
if (!empty($to)) {
$postman = new Activitypub_postman($from, $to);
$postman->create_direct_note($message);
}
}
/**
* Override the "from ActivityPub" bit in notice lists to link to the
* original post and show the domain it came from.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param $notice
* @param $name
* @param $url
* @param $title
* @return mixed hook return code
* @throws Exception
*/
public function onStartNoticeSourceLink($notice, &$name, &$url, &$title)
{
// If we don't handle this, keep the event handler going
if (!in_array($notice->source, array('ActivityPub', 'share'))) {
return true;
}
try {
$url = $notice->getUrl();
// If getUrl() throws exception, $url is never set
$bits = parse_url($url);
$domain = $bits['host'];
if (substr($domain, 0, 4) == 'www.') {
$name = substr($domain, 4);
} else {
$name = $domain;
}
// TRANS: Title. %s is a domain name.
$title = sprintf(_m('Sent from %s via ActivityPub'), $domain);
// Abort event handler, we have a name and URL!
return false;
} catch (InvalidUrlException $e) {
// This just means we don't have the notice source data
return true;
}
}
}
/**
* Plugin return handler
*/
class ActivityPubReturn
{
/**
* Return a valid answer
*
* @param string $res
* @param int $code Status Code
* @return void
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function answer($res = '', $code = 202)
{
http_response_code($code);
header('Content-Type: application/activity+json');
echo json_encode($res, JSON_UNESCAPED_SLASHES | (isset($_GET["pretty"]) ? JSON_PRETTY_PRINT : null));
exit;
}
/**
* Return an error
*
* @param string $m
* @param int $code Status Code
* @return void
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function error($m, $code = 400)
{
http_response_code($code);
header('Content-Type: application/activity+json');
$res[] = Activitypub_error::error_message_to_array($m);
echo json_encode($res, JSON_UNESCAPED_SLASHES);
exit;
}
}