Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

1260 lines
36 KiB

<?php
/**
* @file src/Protocol/ActivityPub.php
*/
namespace Friendica\Protocol;
use Friendica\Database\DBA;
use Friendica\Core\System;
use Friendica\BaseObject;
use Friendica\Util\Network;
use Friendica\Util\HTTPSignature;
use Friendica\Core\Protocol;
use Friendica\Model\Conversation;
use Friendica\Model\Contact;
use Friendica\Model\Item;
use Friendica\Model\User;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Crypto;
use Friendica\Content\Text\BBCode;
use Friendica\Content\Text\HTML;
use Friendica\Network\Probe;
/**
* @brief ActivityPub Protocol class
* The ActivityPub Protocol is a message exchange protocol defined by the W3C.
* https://www.w3.org/TR/activitypub/
* https://www.w3.org/TR/activitystreams-core/
* https://www.w3.org/TR/activitystreams-vocabulary/
*
* https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
* https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
*
* Digest: https://tools.ietf.org/html/rfc5843
* https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
*
* Part of the code for HTTP signing is taken from the Osada project.
* https://framagit.org/macgirvin/osada
*
* To-do:
*
* Receiver:
* - Activities: Dislike, Update, Delete
* - Object Types: Person, Tombstome
*
* Transmitter:
* - Activities: Like, Dislike, Update, Delete
* - Object Tyoes: Article, Announce, Person, Tombstone
*
* General:
* - Message distribution
* - Endpoints: Outbox, Object, Follower, Following
* - General cleanup
*/
class ActivityPub
{
const PUBLIC = 'https://www.w3.org/ns/activitystreams#Public';
public static function isRequest()
{
return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
}
public static function transmit($data, $target, $uid)
{
$owner = User::getOwnerDataById($uid);
if (!$owner) {
return;
}
$content = json_encode($data);
// Header data that is about to be signed.
$host = parse_url($target, PHP_URL_HOST);
$path = parse_url($target, PHP_URL_PATH);
$digest = 'SHA-256=' . base64_encode(hash('sha256', $content, true));
$content_length = strlen($content);
$headers = ['Content-Length: ' . $content_length, 'Digest: ' . $digest, 'Host: ' . $host];
$signed_data = "(request-target): post " . $path . "\ncontent-length: " . $content_length . "\ndigest: " . $digest . "\nhost: " . $host;
$signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
$headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",algorithm="rsa-sha256",headers="(request-target) content-length digest host",signature="' . $signature . '"';
$headers[] = 'Content-Type: application/activity+json';
Network::post($target, $content, $headers);
$return_code = BaseObject::getApp()->get_curl_code();
logger('Transmit to ' . $target . ' returned ' . $return_code);
}
/**
* Return the ActivityPub profile of the given user
*
* @param integer $uid User ID
* @return array
*/
public static function profile($uid)
{
$accounttype = ['Person', 'Organization', 'Service', 'Group', 'Application', 'page-flags'];
$condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
'account_removed' => false, 'verified' => true];
$fields = ['guid', 'nickname', 'pubkey', 'account-type'];
$user = DBA::selectFirst('user', $fields, $condition);
if (!DBA::isResult($user)) {
return [];
}
$fields = ['locality', 'region', 'country-name'];
$profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
if (!DBA::isResult($profile)) {
return [];
}
$fields = ['name', 'url', 'location', 'about', 'avatar'];
$contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
if (!DBA::isResult($contact)) {
return [];
}
$data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
['uuid' => 'http://schema.org/identifier', 'sensitive' => 'as:sensitive',
'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
'vcard' => 'http://www.w3.org/2006/vcard/ns#']]];
$data['id'] = $contact['url'];
$data['uuid'] = $user['guid'];
$data['type'] = $accounttype[$user['account-type']];
$data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
$data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
$data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
$data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
$data['preferredUsername'] = $user['nickname'];
$data['name'] = $contact['name'];
$data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
$data['summary'] = $contact['about'];
$data['url'] = $contact['url'];
$data['manuallyApprovesFollowers'] = in_array($profile['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
$data['publicKey'] = ['id' => $contact['url'] . '#main-key',
'owner' => $contact['url'],
'publicKeyPem' => $user['pubkey']];
$data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
$data['icon'] = ['type' => 'Image',
'url' => $contact['avatar']];
// tags: https://kitty.town/@inmysocks/100656097926961126.json
return $data;
}
public static function createActivityFromItem($item_id)
{
$item = Item::selectFirst([], ['id' => $item_id]);
$data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
['Emoji' => 'toot:Emoji', 'Hashtag' => 'as:Hashtag', 'atomUri' => 'ostatus:atomUri',
'conversation' => 'ostatus:conversation', 'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
'ostatus' => 'http://ostatus.org#', 'sensitive' => 'as:sensitive',
'toot' => 'http://joinmastodon.org/ns#']]];
$data['type'] = 'Create';
$data['id'] = $item['uri'] . '/activity';
$data['actor'] = $item['author-link'];
$data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
$data['object'] = self::createNote($item);
return $data;
}
public static function createNote($item)
{
$data = [];
$data['type'] = 'Note';
$data['id'] = $item['uri'];
if ($item['uri'] != $item['thr-parent']) {
$data['inReplyTo'] = $item['thr-parent'];
}
$conversation = DBA::selectFirst('conversation', ['conversation-uri'], ['item-uri' => $item['parent-uri']]);
if (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
$conversation_uri = $conversation['conversation-uri'];
} else {
$conversation_uri = $item['parent-uri'];
}
$data['context'] = $data['conversation'] = $conversation_uri;
$data['actor'] = $item['author-link'];
if (!$item['private']) {
$data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
}
$data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
$data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
$data['attributedTo'] = $item['author-link'];
$data['name'] = BBCode::convert($item['title'], false, 7);
$data['content'] = BBCode::convert($item['body'], false, 7);
$data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
//$data['summary'] = ''; // Ignore by now
//$data['sensitive'] = false; // - Query NSFW
//$data['emoji'] = []; // Ignore by now
//$data['tag'] = []; /// @ToDo
//$data['attachment'] = []; // @ToDo
return $data;
}
public static function transmitActivity($activity, $target, $uid)
{
$profile = Probe::uri($target, Protocol::ACTIVITYPUB);
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => System::baseUrl() . '/activity/' . System::createGUID(),
'type' => $activity,
'actor' => $owner['url'],
'object' => $profile['url'],
'to' => $profile['url']];
logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
return self::transmit($data, $profile['notify'], $uid);
}
public static function transmitContactAccept($target, $id, $uid)
{
$profile = Probe::uri($target, Protocol::ACTIVITYPUB);
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => System::baseUrl() . '/activity/' . System::createGUID(),
'type' => 'Accept',
'actor' => $owner['url'],
'object' => ['id' => $id, 'type' => 'Follow',
'actor' => $profile['url'],
'object' => $owner['url']],
'to' => $profile['url']];
logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return self::transmit($data, $profile['notify'], $uid);
}
public static function transmitContactReject($target, $id, $uid)
{
$profile = Probe::uri($target, Protocol::ACTIVITYPUB);
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => System::baseUrl() . '/activity/' . System::createGUID(),
'type' => 'Reject',
'actor' => $owner['url'],
'object' => ['id' => $id, 'type' => 'Follow',
'actor' => $profile['url'],
'object' => $owner['url']],
'to' => $profile['url']];
logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return self::transmit($data, $profile['notify'], $uid);
}
public static function transmitContactUndo($target, $uid)
{
$profile = Probe::uri($target, Protocol::ACTIVITYPUB);
$id = System::baseUrl() . '/activity/' . System::createGUID();
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => $id,
'type' => 'Undo',
'actor' => $owner['url'],
'object' => ['id' => $id, 'type' => 'Follow',
'actor' => $owner['url'],
'object' => $profile['url']],
'to' => $profile['url']];
logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return self::transmit($data, $profile['notify'], $uid);
}
/**
* Fetches ActivityPub content from the given url
*
* @param string $url content url
* @return array
*/
public static function fetchContent($url)
{
$ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json, application/ld+json']);
if (!$ret['success'] || empty($ret['body'])) {
return;
}
return json_decode($ret['body'], true);
}
/**
* Resolves the profile url from the address by using webfinger
*
* @param string $addr profile address (user@domain.tld)
* @return string url
*/
private static function addrToUrl($addr)
{
$addr_parts = explode('@', $addr);
if (count($addr_parts) != 2) {
return false;
}
$webfinger = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
$ret = Network::curl($webfinger, false, $redirects, ['accept_content' => 'application/jrd+json,application/json']);
if (!$ret['success'] || empty($ret['body'])) {
return false;
}
$data = json_decode($ret['body'], true);
if (empty($data['links'])) {
return false;
}
foreach ($data['links'] as $link) {
if (empty($link['href']) || empty($link['rel']) || empty($link['type'])) {
continue;
}
if (($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
return $link['href'];
}
}
return false;
}
public static function verifySignature($content, $http_headers)
{
$object = json_decode($content, true);
if (empty($object)) {
return false;
}
$actor = self::processElement($object, 'actor', 'id');
$headers = [];
$headers['(request-target)'] = strtolower($http_headers['REQUEST_METHOD']) . ' ' . $http_headers['REQUEST_URI'];
// First take every header
foreach ($http_headers as $k => $v) {
$field = str_replace('_', '-', strtolower($k));
$headers[$field] = $v;
}
// Now add every http header
foreach ($http_headers as $k => $v) {
if (strpos($k, 'HTTP_') === 0) {
$field = str_replace('_', '-', strtolower(substr($k, 5)));
$headers[$field] = $v;
}
}
$sig_block = ActivityPub::parseSigHeader($http_headers['HTTP_SIGNATURE']);
if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
return false;
}
$signed_data = '';
foreach ($sig_block['headers'] as $h) {
if (array_key_exists($h, $headers)) {
$signed_data .= $h . ': ' . $headers[$h] . "\n";
}
}
$signed_data = rtrim($signed_data, "\n");
if (empty($signed_data)) {
return false;
}
$algorithm = null;
if ($sig_block['algorithm'] === 'rsa-sha256') {
$algorithm = 'sha256';
}
if ($sig_block['algorithm'] === 'rsa-sha512') {
$algorithm = 'sha512';
}
if (empty($algorithm)) {
return false;
}
$key = self::fetchKey($sig_block['keyId'], $actor);
if (empty($key)) {
return false;
}
if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key, $algorithm)) {
return false;
}
// Check the digest when it is part of the signed data
if (in_array('digest', $sig_block['headers'])) {
$digest = explode('=', $headers['digest'], 2);
if ($digest[0] === 'SHA-256') {
$hashalg = 'sha256';
}
if ($digest[0] === 'SHA-512') {
$hashalg = 'sha512';
}
/// @todo add all hashes from the rfc
if (!empty($hashalg) && base64_encode(hash($hashalg, $content, true)) != $digest[1]) {
return false;
}
}
// Check the content-length when it is part of the signed data
if (in_array('content-length', $sig_block['headers'])) {
if (strlen($content) != $headers['content-length']) {
return false;
}
}
return true;
}
private static function fetchKey($id, $actor)
{
$url = (strpos($id, '#') ? substr($id, 0, strpos($id, '#')) : $id);
$profile = Probe::uri($url, Protocol::ACTIVITYPUB);
if (!empty($profile)) {
return $profile['pubkey'];
} elseif ($url != $actor) {
$profile = Probe::uri($actor, Protocol::ACTIVITYPUB);
if (!empty($profile)) {
return $profile['pubkey'];
}
}
return false;
}
/**
* @brief
*
* @param string $header
* @return array associate array with
* - \e string \b keyID
* - \e string \b algorithm
* - \e array \b headers
* - \e string \b signature
*/
private static function parseSigHeader($header)
{
$ret = [];
$matches = [];
if (preg_match('/keyId="(.*?)"/ism',$header,$matches)) {
$ret['keyId'] = $matches[1];
}
if (preg_match('/algorithm="(.*?)"/ism',$header,$matches)) {
$ret['algorithm'] = $matches[1];
}
if (preg_match('/headers="(.*?)"/ism',$header,$matches)) {
$ret['headers'] = explode(' ', $matches[1]);
}
if (preg_match('/signature="(.*?)"/ism',$header,$matches)) {
$ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
}
return $ret;
}
/**
* Fetches a profile from the given url
*
* @param string $url profile url
* @return array
*/
public static function fetchProfile($url)
{
if (empty(parse_url($url, PHP_URL_SCHEME))) {
$url = self::addrToUrl($url);
if (empty($url)) {
return false;
}
}
$data = self::fetchContent($url);
if (empty($data) || empty($data['id']) || empty($data['inbox'])) {
return false;
}
$profile = ['network' => Protocol::ACTIVITYPUB];
$profile['nick'] = $data['preferredUsername'];
$profile['name'] = defaults($data, 'name', $profile['nick']);
$profile['guid'] = defaults($data, 'uuid', null);
$profile['url'] = $data['id'];
$parts = parse_url($profile['url']);
unset($parts['scheme']);
unset($parts['path']);
$profile['addr'] = $profile['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
$profile['alias'] = self::processElement($data, 'url', 'href');
$profile['photo'] = self::processElement($data, 'icon', 'url');
// $profile['community']
// $profile['keywords']
// $profile['location']
$profile['about'] = defaults($data, 'summary', '');
$profile['batch'] = self::processElement($data, 'endpoints', 'sharedInbox');
$profile['notify'] = $data['inbox'];
$profile['poll'] = $data['outbox'];
$profile['pubkey'] = self::processElement($data, 'publicKey', 'publicKeyPem');
// Check if the address is resolvable
if (self::addrToUrl($profile['addr']) == $profile['url']) {
$parts = parse_url($profile['url']);
unset($parts['path']);
$profile['baseurl'] = Network::unparseURL($parts);
} else {
unset($profile['addr']);
}
if ($profile['url'] == $profile['alias']) {
unset($profile['alias']);
}
// Remove all "null" fields
foreach ($profile as $field => $content) {
if (is_null($content)) {
unset($profile[$field]);
}
}
// To-Do
// type, manuallyApprovesFollowers
// Unhandled
// @context, tag, attachment, image, nomadicLocations, signature, following, followers, featured, movedTo, liked
// Unhandled from Misskey
// sharedInbox, isCat
// Unhandled from Kroeg
// kroeg:blocks, updated
return $profile;
}
public static function processInbox($body, $header, $uid)
{
logger('Incoming message for user ' . $uid, LOGGER_DEBUG);
if (!self::verifySignature($body, $header)) {
logger('Invalid signature, message will be discarded.', LOGGER_DEBUG);
return;
}
$activity = json_decode($body, true);
if (!is_array($activity)) {
logger('Invalid body.', LOGGER_DEBUG);
return;
}
self::processActivity($activity, $body, $uid);
}
public static function fetchOutbox($url)
{
$data = self::fetchContent($url);
if (empty($data)) {
return;
}
if (!empty($data['orderedItems'])) {
$items = $data['orderedItems'];
} elseif (!empty($data['first']['orderedItems'])) {
$items = $data['first']['orderedItems'];
} elseif (!empty($data['first'])) {
self::fetchOutbox($data['first']);
return;
} else {
$items = [];
}
foreach ($items as $activity) {
self::processActivity($activity);
}
}
private static function prepareObjectData($activity, $uid)
{
$actor = self::processElement($activity, 'actor', 'id');
if (empty($actor)) {
logger('Empty actor', LOGGER_DEBUG);
return [];
}
// Fetch all receivers from to, cc, bto and bcc
$receivers = self::getReceivers($activity, $actor);
// When it is a delivery to a personal inbox we add that user to the receivers
if (!empty($uid)) {
$owner = User::getOwnerDataById($uid);
$additional = ['uid:' . $uid => $uid];
$receivers = array_merge($receivers, $additional);
}
logger('Receivers: ' . json_encode($receivers), LOGGER_DEBUG);
$public = in_array(0, $receivers);
if (is_string($activity['object'])) {
$object_url = $activity['object'];
} elseif (!empty($activity['object']['id'])) {
$object_url = $activity['object']['id'];
} else {
logger('No object found', LOGGER_DEBUG);
return [];
}
// Fetch the content only on activities where this matters
if (in_array($activity['type'], ['Create', 'Update', 'Announce'])) {
$object_data = self::fetchObject($object_url, $activity['object']);
if (empty($object_data)) {
logger("Object data couldn't be processed", LOGGER_DEBUG);
return [];
}
} elseif ($activity['type'] == 'Accept') {
$object_data = [];
$object_data['object_type'] = self::processElement($activity, 'object', 'type');
$object_data['object'] = self::processElement($activity, 'object', 'actor');
} elseif ($activity['type'] == 'Undo') {
$object_data = [];
$object_data['object_type'] = self::processElement($activity, 'object', 'type');
$object_data['object'] = self::processElement($activity, 'object', 'object');
} elseif (in_array($activity['type'], ['Like', 'Dislike'])) {
// Create a mostly empty array out of the activity data (instead of the object).
// This way we later don't have to check for the existence of ech individual array element.
$object_data = self::processCommonData($activity);
$object_data['name'] = $activity['type'];
$object_data['author'] = $activity['actor'];
$object_data['object'] = $object_url;
} elseif ($activity['type'] == 'Follow') {
$object_data['id'] = $activity['id'];
$object_data['object'] = $object_url;
} else {
$object_data = [];
}
$object_data = self::addActivityFields($object_data, $activity);
$object_data['type'] = $activity['type'];
$object_data['owner'] = $actor;
$object_data['receiver'] = array_merge(defaults($object_data, 'receiver', []), $receivers);
return $object_data;
}
private static function processActivity($activity, $body = '', $uid = null)
{
if (empty($activity['type'])) {
logger('Empty type', LOGGER_DEBUG);
return;
}
if (empty($activity['object'])) {
logger('Empty object', LOGGER_DEBUG);
return;
}
if (empty($activity['actor'])) {
logger('Empty actor', LOGGER_DEBUG);
return;
}
// Non standard
// title, atomUri, context_id, statusnetConversationId
// To-Do?
// context, location, signature;
logger('Processing activity: ' . $activity['type'], LOGGER_DEBUG);
$object_data = self::prepareObjectData($activity, $uid);
if (empty($object_data)) {
logger('No object data found', LOGGER_DEBUG);
return;
}
switch ($activity['type']) {
case 'Create':
case 'Announce':
self::createItem($object_data, $body);
break;
case 'Like':
self::likeItem($object_data, $body);
break;
case 'Dislike':
break;
case 'Update':
break;
case 'Delete':
break;
case 'Follow':
self::followUser($object_data);
break;
case 'Accept':
if ($object_data['object_type'] == 'Follow') {
self::acceptFollowUser($object_data);
}
break;
case 'Undo':
if ($object_data['object_type'] == 'Follow') {
self::undoFollowUser($object_data);
}
break;
default:
logger('Unknown activity: ' . $activity['type'], LOGGER_DEBUG);
break;
}
}
private static function getReceivers($activity, $actor)
{
$receivers = [];
if (!empty($actor)) {
$data = self::fetchContent($actor);
$followers = defaults($data, 'followers', '');
logger('Actor: ' . $actor . ' - Followers: ' . $followers, LOGGER_DEBUG);
} else {
logger('Empty actor', LOGGER_DEBUG);
$followers = '';
}
$elements = ['to', 'cc', 'bto', 'bcc'];
foreach ($elements as $element) {
if (empty($activity[$element])) {
continue;
}
// The receiver can be an arror or a string
if (is_string($activity[$element])) {
$activity[$element] = [$activity[$element]];
}
foreach ($activity[$element] as $receiver) {
if ($receiver == self::PUBLIC) {
$receivers['uid:0'] = 0;
}
if (($receiver == self::PUBLIC) && !empty($actor)) {
// This will most likely catch all OStatus connections to Mastodon
$condition = ['alias' => [$actor, normalise_link($actor)], 'rel' => [Contact::SHARING, Contact::FRIEND]];
$contacts = DBA::select('contact', ['uid'], $condition);
while ($contact = DBA::fetch($contacts)) {
if ($contact['uid'] != 0) {
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
DBA::close($contacts);
}
if (in_array($receiver, [$followers, self::PUBLIC]) && !empty($actor)) {
$condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
'network' => Protocol::ACTIVITYPUB];
$contacts = DBA::select('contact', ['uid'], $condition);
while ($contact = DBA::fetch($contacts)) {
if ($contact['uid'] != 0) {
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
DBA::close($contacts);
continue;
}
$condition = ['self' => true, 'nurl' => normalise_link($receiver)];
$contact = DBA::selectFirst('contact', ['uid'], $condition);
if (!DBA::isResult($contact)) {
continue;
}
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
return $receivers;
}
private static function addActivityFields($object_data, $activity)
{
if (!empty($activity['published']) && empty($object_data['published'])) {
$object_data['published'] = $activity['published'];
}
if (!empty($activity['updated']) && empty($object_data['updated'])) {
$object_data['updated'] = $activity['updated'];
}
if (!empty($activity['inReplyTo']) && empty($object_data['parent-uri'])) {
$object_data['parent-uri'] = self::processElement($activity, 'inReplyTo', 'id');
}
if (!empty($activity['instrument'])) {
$object_data['service'] = self::processElement($activity, 'instrument', 'name', 'type', 'Service');
}
return $object_data;
}
private static function fetchObject($object_url, $object = [], $public = true)
{
if ($public) {
$data = self::fetchContent($object_url);
if (empty($data)) {
logger('Empty content for ' . $object_url . ', check if content is available locally.', LOGGER_DEBUG);
$data = $object_url;
$data = $object;
}
} else {
logger('Using original object for url ' . $object_url, LOGGER_DEBUG);
$data = $object;
}
if (is_string($data)) {
$item = Item::selectFirst([], ['uri' => $data]);
if (!DBA::isResult($item)) {
logger('Object with url ' . $data . ' was not found locally.', LOGGER_DEBUG);
return false;
}
logger('Using already stored item for url ' . $object_url, LOGGER_DEBUG);
$data = self::createNote($item);
}
if (empty($data['type'])) {
logger('Empty type', LOGGER_DEBUG);
return false;
} else {
$type = $data['type'];
logger('Type ' . $type, LOGGER_DEBUG);
}
if (in_array($type, ['Note', 'Article', 'Video'])) {
$common = self::processCommonData($data);
}
switch ($type) {
case 'Note':
return array_merge($common, self::processNote($data));
case 'Article':
return array_merge($common, self::processArticle($data));
case 'Video':
return array_merge($common, self::processVideo($data));
case 'Announce':
if (empty($data['object'])) {
return false;
}
return self::fetchObject($data['object']);
case 'Person':
case 'Tombstone':
break;
default:
logger('Unknown object type: ' . $data['type'], LOGGER_DEBUG);
break;
}
}
private static function processCommonData(&$object)
{
if (empty($object['id'])) {
return false;
}
$object_data = [];
$object_data['type'] = $object['type'];
$object_data['uri'] = $object['id'];
if (!empty($object['inReplyTo'])) {
$object_data['reply-to-uri'] = self::processElement($object, 'inReplyTo', 'id');
} else {
$object_data['reply-to-uri'] = $object_data['uri'];
}
$object_data['published'] = defaults($object, 'published', null);
$object_data['updated'] = defaults($object, 'updated', $object_data['published']);
if (empty($object_data['published']) && !empty($object_data['updated'])) {
$object_data['published'] = $object_data['updated'];
}
$object_data['uuid'] = defaults($object, 'uuid', null);
$object_data['owner'] = $object_data['author'] = self::processElement($object, 'attributedTo', 'id');
$object_data['context'] = defaults($object, 'context', null);
$object_data['conversation'] = defaults($object, 'conversation', null);
$object_data['sensitive'] = defaults($object, 'sensitive', null);
$object_data['name'] = defaults($object, 'title', null);
$object_data['name'] = defaults($object, 'name', $object_data['name']);
$object_data['summary'] = defaults($object, 'summary', null);
$object_data['content'] = defaults($object, 'content', null);
$object_data['source'] = defaults($object, 'source', null);
$object_data['location'] = self::processElement($object, 'location', 'name', 'type', 'Place');
$object_data['attachments'] = defaults($object, 'attachment', null);
$object_data['tags'] = defaults($object, 'tag', null);
$object_data['service'] = self::processElement($object, 'instrument', 'name', 'type', 'Service');
$object_data['alternate-url'] = self::processElement($object, 'url', 'href');
$object_data['receiver'] = self::getReceivers($object, $object_data['owner']);
// Unhandled
// @context, type, actor, signature, mediaType, duration, replies, icon
// Also missing: (Defined in the standard, but currently unused)
// audience, preview, endTime, startTime, generator, image
return $object_data;
}
private static function processNote($object)
{
$object_data = [];
// To-Do?
// emoji, atomUri, inReplyToAtomUri
// Unhandled
// contentMap, announcement_count, announcements, context_id, likes, like_count
// inReplyToStatusId, shares, quoteUrl, statusnetConversationId
return $object_data;
}
private static function processArticle($object)
{
$object_data = [];
return $object_data;
}
private static function processVideo($object)
{
$object_data = [];
// To-Do?
// category, licence, language, commentsEnabled
// Unhandled
// views, waitTranscoding, state, support, subtitleLanguage
// likes, dislikes, shares, comments
return $object_data;
}
private static function processElement($array, $element, $key, $type = null, $type_value = null)
{
if (empty($array)) {
return false;
}
if (empty($array[$element])) {
return false;
}
if (is_string($array[$element])) {
return $array[$element];
}
if (is_null($type_value)) {
if (!empty($array[$element][$key])) {
return $array[$element][$key];
}
if (!empty($array[$element][0][$key])) {
return $array[$element][0][$key];
}
return false;
}
if (!empty($array[$element][$key]) && !empty($array[$element][$type]) && ($array[$element][$type] == $type_value)) {
return $array[$element][$key];
}
/// @todo Add array search
return false;
}
private static function convertMentions($body)
{
$URLSearchString = "^\[\]";
$body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
return $body;
}
private static function constructTagList($tags, $sensitive)
{
if (empty($tags)) {
return '';
}
$tag_text = '';
foreach ($tags as $tag) {
if (in_array($tag['type'], ['Mention', 'Hashtag'])) {
if (!empty($tag_text)) {
$tag_text .= ',';
}
$tag_text .= substr($tag['name'], 0, 1) . '[url=' . $tag['href'] . ']' . substr($tag['name'], 1) . '[/url]';
}
}
/// @todo add nsfw for $sensitive
return $tag_text;
}
private static function constructAttachList($attachments, $item)
{
if (empty($attachments)) {
return $item;
}
foreach ($attachments as $attach) {
$filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
if ($filetype == 'image') {
$item['body'] .= "\n[img]".$attach['url'].'[/img]';
} else {
if (!empty($item["attach"])) {
$item["attach"] .= ',';
} else {
$item["attach"] = '';
}
if (!isset($attach['length'])) {
$attach['length'] = "0";
}
$item["attach"] .= '[attach]href="'.$attach['url'].'" length="'.$attach['length'].'" type="'.$attach['mediaType'].'" title="'.defaults($attach, 'name', '').'"[/attach]';
}
}
return $item;
}
private static function createItem($activity, $body)
{
$item = [];
$item['verb'] = ACTIVITY_POST;
$item['parent-uri'] = $activity['reply-to-uri'];
if ($activity['reply-to-uri'] == $activity['uri']) {
$item['gravity'] = GRAVITY_PARENT;
$item['object-type'] = ACTIVITY_OBJ_NOTE;
} else {
$item['gravity'] = GRAVITY_COMMENT;
$item['object-type'] = ACTIVITY_OBJ_COMMENT;
}
if (($activity['uri'] != $activity['reply-to-uri']) && !Item::exists(['uri' => $activity['reply-to-uri']])) {
logger('Parent ' . $activity['reply-to-uri'] . ' not found. Try to refetch it.');
self::fetchMissingActivity($activity['reply-to-uri'], $activity);
}
self::postItem($activity, $item, $body);
}
private static function likeItem($activity, $body)
{
$item = [];
$item['verb'] = ACTIVITY_LIKE;
$item['parent-uri'] = $activity['object'];
$item['gravity'] = GRAVITY_ACTIVITY;
$item['object-type'] = ACTIVITY_OBJ_NOTE;
self::postItem($activity, $item, $body);
}
private static function postItem($activity, $item, $body)
{
/// @todo What to do with $activity['context']?
$item['network'] = Protocol::ACTIVITYPUB;
$item['private'] = !in_array(0, $activity['receiver']);
$item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
$item['owner-id'] = Contact::getIdForURL($activity['owner'], 0, true);
$item['uri'] = $activity['uri'];
$item['created'] = $activity['published'];
$item['edited'] = $activity['updated'];
$item['guid'] = $activity['uuid'];
$item['title'] = HTML::toBBCode($activity['name']);
$item['content-warning'] = HTML::toBBCode($activity['summary']);
$item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
$item['location'] = $activity['location'];
$item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
$item['app'] = $activity['service'];
$item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
$item = self::constructAttachList($activity['attachments'], $item);
$source = self::processElement($activity, 'source', 'content', 'mediaType', 'text/bbcode');
if (!empty($source)) {
$item['body'] = $source;
}
$item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
$item['source'] = $body;
$item['conversation-uri'] = $activity['conversation'];
foreach ($activity['receiver'] as $receiver) {
$item['uid'] = $receiver;
$item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
if (($receiver != 0) && empty($item['contact-id'])) {
$item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
}
$item_id = Item::insert($item);
logger('Storing for user ' . $item['uid'] . ': ' . $item_id);
}
}
private static function fetchMissingActivity($url, $child)
{
$object = ActivityPub::fetchContent($url);
if (empty($object)) {
logger('Activity ' . $url . ' was not fetchable, aborting.');
return;
}
$activity = [];
$activity['@context'] = $object['@context'];
unset($object['@context']);
$activity['id'] = $object['id'];
$activity['to'] = defaults($object, 'to', []);
$activity['cc'] = defaults($object, 'cc', []);
$activity['actor'] = $activity['author'];
$activity['object'] = $object;
$activity['published'] = $object['published'];
$activity['type'] = 'Create';
self::processActivity($activity);
logger('Activity ' . $url . ' had been fetched and processed.');
}
private static function getUserOfObject($object)
{
$self = DBA::selectFirst('contact', ['uid'], ['nurl' => normalise_link($object), 'self' => true]);
if (!DBA::isResult($self)) {
return false;
} else {
return $self['uid'];
}
}
private static function followUser($activity)
{
$uid = self::getUserOfObject($activity['object']);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (!empty($cid)) {
$contact = DBA::selectFirst('contact', [], ['id' => $cid]);
} else {
$contact = false;
}
$item = ['author-id' => Contact::getIdForURL($activity['owner']),
'author-link' => $activity['owner']];
Contact::addRelationship($owner, $contact, $item);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (empty($cid)) {
return;
}
$contact = DBA::selectFirst('contact', ['network'], ['id' => $cid]);
if ($contact['network'] != Protocol::ACTIVITYPUB) {
Contact::updateFromProbe($cid, Protocol::ACTIVITYPUB);
}
DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
logger('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
}
private static function acceptFollowUser($activity)
{
$uid = self::getUserOfObject($activity['object']);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (empty($cid)) {
logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
return;
}
$fields = ['pending' => false];
$contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
if ($contact['rel'] == Contact::FOLLOWER) {
$fields['rel'] = Contact::FRIEND;
}
$condition = ['id' => $cid];
DBA::update('contact', $fields, $condition);
logger('Accept contact request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
}
private static function undoFollowUser($activity)
{
$uid = self::getUserOfObject($activity['object']);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (empty($cid)) {
logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
return;
}
$contact = DBA::selectFirst('contact', [], ['id' => $cid]);
if (!DBA::isResult($contact)) {
return;
}
Contact::removeFollower($owner, $contact);
logger('Undo following request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
}
}