Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program 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.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Protocol\ActivityPub;
use Friendica\Content\Text\BBCode;
use Friendica\Database\DBA;
use Friendica\Content\Text\HTML;
use Friendica\Content\Text\Markdown;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Model\Contact;
use Friendica\Model\APContact;
use Friendica\Model\Item;
use Friendica\Model\User;
use Friendica\Protocol\Activity;
use Friendica\Protocol\ActivityPub;
use Friendica\Util\HTTPSignature;
use Friendica\Util\JsonLD;
use Friendica\Util\LDSignature;
use Friendica\Util\Strings;
/**
* ActivityPub Receiver Protocol class
*
* To-Do:
* @todo Undo Announce
*
* Check what this is meant to do:
* - Add
* - Block
* - Flag
* - Remove
* - Undo Block
*/
class Receiver
{
const PUBLIC_COLLECTION = 'as:Public';
const ACCOUNT_TYPES = ['as:Person', 'as:Organization', 'as:Service', 'as:Group', 'as:Application'];
const CONTENT_TYPES = ['as:Note', 'as:Article', 'as:Video', 'as:Image', 'as:Event', 'as:Audio'];
const ACTIVITY_TYPES = ['as:Like', 'as:Dislike', 'as:Accept', 'as:Reject', 'as:TentativeAccept'];
const TARGET_UNKNOWN = 0;
const TARGET_TO = 1;
const TARGET_CC = 2;
const TARGET_BTO = 3;
const TARGET_BCC = 4;
const TARGET_FOLLOWER = 5;
const TARGET_ANSWER = 6;
const TARGET_GLOBAL = 7;
/**
* Checks if the web request is done for the AP protocol
*
* @return bool is it AP?
*/
public static function isRequest()
{
return stristr($_SERVER['HTTP_ACCEPT'] ?? '', 'application/activity+json') ||
stristr($_SERVER['HTTP_ACCEPT'] ?? '', 'application/ld+json');
}
/**
* Checks incoming message from the inbox
*
* @param $body
* @param $header
* @param integer $uid User ID
* @throws \Exception
*/
public static function processInbox($body, $header, $uid)
{
$activity = json_decode($body, true);
if (empty($activity)) {
Logger::warning('Invalid body.');
return;
}
$ldactivity = JsonLD::compact($activity);
$actor = JsonLD::fetchElement($ldactivity, 'as:actor', '@id');
$apcontact = APContact::getByURL($actor);
if (!empty($apcontact) && ($apcontact['type'] == 'Application') && ($apcontact['nick'] == 'relay')) {
self::processRelayPost($ldactivity);
return;
}
$http_signer = HTTPSignature::getSigner($body, $header);
if (empty($http_signer)) {
Logger::warning('Invalid HTTP signature, message will be discarded.');
return;
} else {
Logger::info('Valid HTTP signature', ['signer' => $http_signer]);
}
$signer = [$http_signer];
Logger::info('Message for user ' . $uid . ' is from actor ' . $actor);
if (LDSignature::isSigned($activity)) {
$ld_signer = LDSignature::getSigner($activity);
if (empty($ld_signer)) {
Logger::log('Invalid JSON-LD signature from ' . $actor, Logger::DEBUG);
} elseif ($ld_signer != $http_signer) {
$signer[] = $ld_signer;
}
if (!empty($ld_signer && ($actor == $http_signer))) {
Logger::log('The HTTP and the JSON-LD signature belong to ' . $ld_signer, Logger::DEBUG);
$trust_source = true;
} elseif (!empty($ld_signer)) {
Logger::log('JSON-LD signature is signed by ' . $ld_signer, Logger::DEBUG);
$trust_source = true;
} elseif ($actor == $http_signer) {
Logger::log('Bad JSON-LD signature, but HTTP signer fits the actor.', Logger::DEBUG);
$trust_source = true;
} else {
Logger::log('Invalid JSON-LD signature and the HTTP signer is different.', Logger::DEBUG);
$trust_source = false;
}
} elseif ($actor == $http_signer) {
Logger::log('Trusting post without JSON-LD signature, The actor fits the HTTP signer.', Logger::DEBUG);
$trust_source = true;
} else {
Logger::log('No JSON-LD signature, different actor.', Logger::DEBUG);
$trust_source = false;
}
self::processActivity($ldactivity, $body, $uid, $trust_source, true, $signer);
}
/**
* Process incoming posts from relays
*
* @param array $activity
* @return void
*/
private static function processRelayPost(array $activity)
{
$type = JsonLD::fetchElement($activity, '@type');
if (!$type) {
Logger::info('Empty type', ['activity' => $activity]);
return;
}
if ($type != 'as:Announce') {
Logger::info('Not an announcement', ['activity' => $activity]);
return;
}
$object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
if (empty($object_id)) {
Logger::info('No object id found', ['activity' => $activity]);
return;
}
Logger::info('Got relayed message id', ['id' => $object_id]);
$item_id = Item::searchByLink($object_id);
if ($item_id) {
Logger::info('Relayed message already exists', ['id' => $object_id, 'item' => $item_id]);
return;
}
Processor::fetchMissingActivity($object_id);
$item_id = Item::searchByLink($object_id);
if ($item_id) {
Logger::info('Relayed message had been fetched and stored', ['id' => $object_id, 'item' => $item_id]);
} else {
Logger::notice('Relayed message had not been stored', ['id' => $object_id]);
}
}
/**
* Fetches the object type for a given object id
*
* @param array $activity
* @param string $object_id Object ID of the the provided object
* @param integer $uid User ID
*
* @return string with object type
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
private static function fetchObjectType($activity, $object_id, $uid = 0)
{
if (!empty($activity['as:object'])) {
$object_type = JsonLD::fetchElement($activity['as:object'], '@type');
if (!empty($object_type)) {
return $object_type;
}
}
if (Item::exists(['uri' => $object_id, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT]])) {
// We just assume "note" since it doesn't make a difference for the further processing
return 'as:Note';
}
$profile = APContact::getByURL($object_id);
if (!empty($profile['type'])) {
return 'as:' . $profile['type'];
}
$data = ActivityPub::fetchContent($object_id, $uid);
if (!empty($data)) {
$object = JsonLD::compact($data);
$type = JsonLD::fetchElement($object, '@type');
if (!empty($type)) {
return $type;
}
}
return null;
}
/**
* Prepare the object array
*
* @param array $activity Array with activity data
* @param integer $uid User ID
* @param boolean $push Message had been pushed to our system
* @param boolean $trust_source Do we trust the source?
*
* @return array with object data
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function prepareObjectData($activity, $uid, $push, &$trust_source)
{
$id = JsonLD::fetchElement($activity, '@id');
if (!empty($id) && !$trust_source) {
$fetched_activity = ActivityPub::fetchContent($id, $uid ?? 0);
if (!empty($fetched_activity)) {
$object = JsonLD::compact($fetched_activity);
$fetched_id = JsonLD::fetchElement($object, '@id');
if ($fetched_id == $id) {
Logger::info('Activity had been fetched successfully', ['id' => $id]);
$trust_source = true;
$activity = $object;
} else {
Logger::info('Activity id is not equal', ['id' => $id, 'fetched' => $fetched_id]);
}
} else {
Logger::info('Activity could not been fetched', ['id' => $id]);
}
}
$actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
if (empty($actor)) {
Logger::info('Empty actor', ['activity' => $activity]);
return [];
}
$type = JsonLD::fetchElement($activity, '@type');
// Fetch all receivers from to, cc, bto and bcc
$receiverdata = self::getReceivers($activity, $actor);
$receivers = $reception_types = [];
foreach ($receiverdata as $key => $data) {
$receivers[$key] = $data['uid'];
$reception_types[$data['uid']] = $data['type'] ?? 0;
}
// When it is a delivery to a personal inbox we add that user to the receivers
if (!empty($uid)) {
$additional = ['uid:' . $uid => $uid];
$receivers = array_merge($receivers, $additional);
if (empty($reception_types[$uid]) || in_array($reception_types[$uid], [self::TARGET_UNKNOWN, self::TARGET_FOLLOWER, self::TARGET_ANSWER, self::TARGET_GLOBAL])) {
$reception_types[$uid] = self::TARGET_BCC;
}
} else {
// We possibly need some user to fetch private content,
// so we fetch the first out ot the list.
$uid = self::getFirstUserFromReceivers($receivers);
}
$object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
if (empty($object_id)) {
Logger::log('No object found', Logger::DEBUG);
return [];
}
if (!is_string($object_id)) {
Logger::info('Invalid object id', ['object' => $object_id]);
return [];
}
$object_type = self::fetchObjectType($activity, $object_id, $uid);
// Fetch the content only on activities where this matters
if (in_array($type, ['as:Create', 'as:Update', 'as:Announce'])) {
// Always fetch on "Announce"
$object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source && ($type != 'as:Announce'), $uid);
if (empty($object_data)) {
Logger::log("Object data couldn't be processed", Logger::DEBUG);
return [];
}
$object_data['object_id'] = $object_id;
if ($type == 'as:Announce') {
$object_data['push'] = false;
} else {
$object_data['push'] = $push;
}
// Test if it is an answer to a mail
if (DBA::exists('mail', ['uri' => $object_data['reply-to-id']])) {
$object_data['directmessage'] = true;
} else {
$object_data['directmessage'] = JsonLD::fetchElement($activity, 'litepub:directMessage');
}
} elseif (in_array($type, array_merge(self::ACTIVITY_TYPES, ['as:Follow'])) && in_array($object_type, self::CONTENT_TYPES)) {
// 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.
$object_data = self::processObject($activity);
$object_data['name'] = $type;
$object_data['author'] = JsonLD::fetchElement($activity, 'as:actor', '@id');
$object_data['object_id'] = $object_id;
$object_data['object_type'] = ''; // Since we don't fetch the object, we don't know the type
} elseif (in_array($type, ['as:Add'])) {
$object_data = [];
$object_data['id'] = JsonLD::fetchElement($activity, '@id');
$object_data['target_id'] = JsonLD::fetchElement($activity, 'as:target', '@id');
$object_data['object_id'] = JsonLD::fetchElement($activity, 'as:object', '@id');
$object_data['object_type'] = JsonLD::fetchElement($activity['as:object'], '@type');
$object_data['object_content'] = JsonLD::fetchElement($activity['as:object'], 'as:content', '@type');
} else {
$object_data = [];
$object_data['id'] = JsonLD::fetchElement($activity, '@id');
$object_data['object_id'] = JsonLD::fetchElement($activity, 'as:object', '@id');
$object_data['object_actor'] = JsonLD::fetchElement($activity['as:object'], 'as:actor', '@id');
$object_data['object_object'] = JsonLD::fetchElement($activity['as:object'], 'as:object');
$object_data['object_type'] = JsonLD::fetchElement($activity['as:object'], '@type');
// An Undo is done on the object of an object, so we need that type as well
if (($type == 'as:Undo') && !empty($object_data['object_object'])) {
$object_data['object_object_type'] = self::fetchObjectType([], $object_data['object_object'], $uid);
}
}
$object_data = self::addActivityFields($object_data, $activity);
if (empty($object_data['object_type'])) {
$object_data['object_type'] = $object_type;
}
$object_data['type'] = $type;
$object_data['actor'] = $actor;
$object_data['item_receiver'] = $receivers;
$object_data['receiver'] = array_merge($object_data['receiver'] ?? [], $receivers);
$object_data['reception_type'] = array_merge($object_data['reception_type'] ?? [], $reception_types);
$author = $object_data['author'] ?? $actor;
if (!empty($author) && !empty($object_data['id'])) {
$author_host = parse_url($author, PHP_URL_HOST);
$id_host = parse_url($object_data['id'], PHP_URL_HOST);
if ($author_host == $id_host) {
Logger::info('Valid hosts', ['type' => $type, 'host' => $id_host]);
} else {
Logger::notice('Differing hosts on author and id', ['type' => $type, 'author' => $author_host, 'id' => $id_host]);
$trust_source = false;
}
}
Logger::log('Processing ' . $object_data['type'] . ' ' . $object_data['object_type'] . ' ' . $object_data['id'], Logger::DEBUG);
return $object_data;
}
/**
* Fetches the first user id from the receiver array
*
* @param array $receivers Array with receivers
* @return integer user id;
*/
public static function getFirstUserFromReceivers($receivers)
{
foreach ($receivers as $receiver) {
if (!empty($receiver)) {
return $receiver;
}
}
return 0;
}
/**
* Processes the activity object
*
* @param array $activity Array with activity data
* @param string $body
* @param integer $uid User ID
* @param boolean $trust_source Do we trust the source?
* @param boolean $push Message had been pushed to our system
* @throws \Exception
*/
public static function processActivity($activity, string $body = '', int $uid = null, bool $trust_source = false, bool $push = false, array $signer = [])
{
$type = JsonLD::fetchElement($activity, '@type');
if (!$type) {
Logger::info('Empty type', ['activity' => $activity]);
return;
}
if (!JsonLD::fetchElement($activity, 'as:object', '@id')) {
Logger::info('Empty object', ['activity' => $activity]);
return;
}
$actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
if (empty($actor)) {
Logger::info('Empty actor', ['activity' => $activity]);
return;
}
if (is_array($activity['as:object'])) {
$attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
} else {
$attributed_to = '';
}
// Test the provided signatures against the actor and "attributedTo"
if ($trust_source) {
if (!empty($attributed_to) && !empty($actor)) {
$trust_source = (in_array($actor, $signer) && in_array($attributed_to, $signer));
} else {
$trust_source = in_array($actor, $signer);
}
}
// $trust_source is called by reference and is set to true if the content was retrieved successfully
$object_data = self::prepareObjectData($activity, $uid, $push, $trust_source);
if (empty($object_data)) {
Logger::info('No object data found', ['activity' => $activity]);
return;
}
if (!$trust_source) {
Logger::info('Activity trust could not be achieved.', ['id' => $object_data['object_id'], 'type' => $type, 'signer' => $signer, 'actor' => $actor, 'attributedTo' => $attributed_to]);
return;
}
if (!empty($body) && empty($object_data['raw'])) {
$object_data['raw'] = $body;
}
// Internal flag for thread completion. See Processor.php
if (!empty($activity['thread-completion'])) {
$object_data['thread-completion'] = $activity['thread-completion'];
}
switch ($type) {
case 'as:Create':
if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
$item = ActivityPub\Processor::createItem($object_data);
ActivityPub\Processor::postItem($object_data, $item);
}
break;
case 'as:Add':
if ($object_data['object_type'] == 'as:tag') {
ActivityPub\Processor::addTag($object_data);
}
break;
case 'as:Announce':
if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
$object_data['thread-completion'] = true;
$item = ActivityPub\Processor::createItem($object_data);
if (empty($item)) {
return;
}
$item['post-type'] = Item::PT_ANNOUNCEMENT;
ActivityPub\Processor::postItem($object_data, $item);
$announce_object_data = self::processObject($activity);
$announce_object_data['name'] = $type;
$announce_object_data['author'] = JsonLD::fetchElement($activity, 'as:actor', '@id');
$announce_object_data['object_id'] = $object_data['object_id'];
$announce_object_data['object_type'] = $object_data['object_type'];
$announce_object_data['push'] = $push;
if (!empty($body)) {
$announce_object_data['raw'] = $body;
}
ActivityPub\Processor::createActivity($announce_object_data, Activity::ANNOUNCE);
}
break;
case 'as:Like':
if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::createActivity($object_data, Activity::LIKE);
}
break;
case 'as:Dislike':
if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::createActivity($object_data, Activity::DISLIKE);
}
break;
case 'as:TentativeAccept':
if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::createActivity($object_data, Activity::ATTENDMAYBE);
}
break;
case 'as:Update':
if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::updateItem($object_data);
} elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
ActivityPub\Processor::updatePerson($object_data);
}
break;
case 'as:Delete':
if ($object_data['object_type'] == 'as:Tombstone') {
ActivityPub\Processor::deleteItem($object_data);
} elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
ActivityPub\Processor::deletePerson($object_data);
}
break;
case 'as:Follow':
if (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
ActivityPub\Processor::followUser($object_data);
} elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
$object_data['reply-to-id'] = $object_data['object_id'];
ActivityPub\Processor::createActivity($object_data, Activity::FOLLOW);
}
break;
case 'as:Accept':
if ($object_data['object_type'] == 'as:Follow') {
ActivityPub\Processor::acceptFollowUser($object_data);
} elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::createActivity($object_data, Activity::ATTEND);
}
break;
case 'as:Reject':
if ($object_data['object_type'] == 'as:Follow') {
ActivityPub\Processor::rejectFollowUser($object_data);
} elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::createActivity($object_data, Activity::ATTENDNO);
}
break;
case 'as:Undo':
if (($object_data['object_type'] == 'as:Follow') &&
in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
ActivityPub\Processor::undoFollowUser($object_data);
} elseif (($object_data['object_type'] == 'as:Accept') &&
in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
ActivityPub\Processor::rejectFollowUser($object_data);
} elseif (in_array($object_data['object_type'], self::ACTIVITY_TYPES) &&
in_array($object_data['object_object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::undoActivity($object_data);
}
break;
default:
Logger::log('Unknown activity: ' . $type . ' ' . $object_data['object_type'], Logger::DEBUG);
break;
}
}
/**
* Fetch the receiver list from an activity array
*
* @param array $activity
* @param string $actor
* @param array $tags
* @param boolean $fetch_unlisted
*
* @return array with receivers (user id)
* @throws \Exception
*/
private static function getReceivers($activity, $actor, $tags = [], $fetch_unlisted = false)
{
$reply = $receivers = [];
// When it is an answer, we inherite the receivers from the parent
$replyto = JsonLD::fetchElement($activity, 'as:inReplyTo', '@id');
if (!empty($replyto)) {
$reply = [$replyto];
// Fix possibly wrong item URI (could be an answer to a plink uri)
$fixedReplyTo = Item::getURIByLink($replyto);
if (!empty($fixedReplyTo)) {
$reply[] = $fixedReplyTo;
}
}
// Fetch all posts that refer to the object id
$object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
if (!empty($object_id)) {
$reply[] = $object_id;
}
if (!empty($reply)) {
$parents = Item::select(['uid'], ['uri' => $reply]);
while ($parent = Item::fetch($parents)) {
$receivers['uid:' . $parent['uid']] = ['uid' => $parent['uid'], 'type' => self::TARGET_ANSWER];
}
}
if (!empty($actor)) {
$profile = APContact::getByURL($actor);
$followers = $profile['followers'] ?? '';
Logger::log('Actor: ' . $actor . ' - Followers: ' . $followers, Logger::DEBUG);
} else {
Logger::info('Empty actor', ['activity' => $activity]);
$followers = '';
}
foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
$receiver_list = JsonLD::fetchElementArray($activity, $element, '@id');
if (empty($receiver_list)) {
continue;
}
foreach ($receiver_list as $receiver) {
if ($receiver == self::PUBLIC_COLLECTION) {
$receivers['uid:0'] = ['uid' => 0, 'type' => self::TARGET_GLOBAL];
}
// Add receiver "-1" for unlisted posts
if ($fetch_unlisted && ($receiver == self::PUBLIC_COLLECTION) && ($element == 'as:cc')) {
$receivers['uid:-1'] = ['uid' => -1, 'type' => self::TARGET_GLOBAL];
}
// Fetch the receivers for the public and the followers collection
if (in_array($receiver, [$followers, self::PUBLIC_COLLECTION]) && !empty($actor)) {
$receivers = self::getReceiverForActor($actor, $tags, $receivers);
continue;
}
// Fetching all directly addressed receivers
$condition = ['self' => true, 'nurl' => Strings::normaliseLink($receiver)];
$contact = DBA::selectFirst('contact', ['uid', 'contact-type'], $condition);
if (!DBA::isResult($contact)) {
continue;
}
// Check if the potential receiver is following the actor
// Exception: The receiver is targetted via "to" or this is a comment
if ((($element != 'as:to') && empty($replyto)) || ($contact['contact-type'] == Contact::TYPE_COMMUNITY)) {
$networks = Protocol::FEDERATED;
$condition = ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
'network' => $networks, 'archive' => false, 'pending' => false, 'uid' => $contact['uid']];
// Forum posts are only accepted from forum contacts
if ($contact['contact-type'] == Contact::TYPE_COMMUNITY) {
$condition['rel'] = [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER];
}
if (!DBA::exists('contact', $condition)) {
continue;
}
}
$type = $receivers['uid:' . $contact['uid']]['type'] ?? self::TARGET_UNKNOWN;
if (in_array($type, [self::TARGET_UNKNOWN, self::TARGET_FOLLOWER, self::TARGET_ANSWER, self::TARGET_GLOBAL])) {
switch ($element) {
case 'as:to':
$type = self::TARGET_TO;
break;
case 'as:cc':
$type = self::TARGET_CC;
break;
case 'as:bto':
$type = self::TARGET_BTO;
break;
case 'as:bcc':
$type = self::TARGET_BCC;
break;
}
$receivers['uid:' . $contact['uid']] = ['uid' => $contact['uid'], 'type' => $type];
}
}
}
self::switchContacts($receivers, $actor);
return $receivers;
}
/**
* Fetch the receiver list of a given actor
*
* @param string $actor
* @param array $tags
*
* @return array with receivers (user id)
* @throws \Exception
*/
private static function getReceiverForActor($actor, $tags, $receivers)
{
$basecondition = ['rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
'network' => Protocol::FEDERATED, 'archive' => false, 'pending' => false];
$condition = DBA::mergeConditions($basecondition, ['nurl' => Strings::normaliseLink($actor)]);
$contacts = DBA::select('contact', ['uid', 'rel'], $condition);
while ($contact = DBA::fetch($contacts)) {
if (empty($receivers['uid:' . $contact['uid']]) && self::isValidReceiverForActor($contact, $actor, $tags)) {
$receivers['uid:' . $contact['uid']] = ['uid' => $contact['uid'], 'type' => self::TARGET_FOLLOWER];
}
}
DBA::close($contacts);
// The queries are split because of performance issues
$condition = DBA::mergeConditions($basecondition, ["`alias` IN (?, ?)", Strings::normaliseLink($actor), $actor]);
$contacts = DBA::select('contact', ['uid', 'rel'], $condition);
while ($contact = DBA::fetch($contacts)) {
if (empty($receivers['uid:' . $contact['uid']]) && self::isValidReceiverForActor($contact, $actor, $tags)) {
$receivers['uid:' . $contact['uid']] = ['uid' => $contact['uid'], 'type' => self::TARGET_FOLLOWER];
}
}
DBA::close($contacts);
return $receivers;
}
/**
* Tests if the contact is a valid receiver for this actor
*
* @param array $contact
* @param string $actor
* @param array $tags
*
* @return bool with receivers (user id)
* @throws \Exception
*/
private static function isValidReceiverForActor($contact, $actor, $tags)
{
// Public contacts are no valid receiver
if ($contact['uid'] == 0) {
return false;
}
// Are we following the contact? Then this is a valid receiver
if (in_array($contact['rel'], [Contact::SHARING, Contact::FRIEND])) {
return true;
}
// When the possible receiver isn't a community, then it is no valid receiver
$owner = User::getOwnerDataById($contact['uid']);
if (empty($owner) || ($owner['contact-type'] != Contact::TYPE_COMMUNITY)) {
return false;
}
// Is the community account tagged?
foreach ($tags as $tag) {
if ($tag['type'] != 'Mention') {
continue;
}
if ($tag['href'] == $owner['url']) {
return true;
}
}
return false;
}
/**
* Switches existing contacts to ActivityPub
*
* @param integer $cid Contact ID
* @param integer $uid User ID
* @param string $url Profile URL
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function switchContact($cid, $uid, $url)
{
if (DBA::exists('contact', ['id' => $cid, 'network' => Protocol::ACTIVITYPUB])) {
Logger::info('Contact is already ActivityPub', ['id' => $cid, 'uid' => $uid, 'url' => $url]);
return;
}
if (Contact::updateFromProbe($cid)) {
Logger::info('Update was successful', ['id' => $cid, 'uid' => $uid, 'url' => $url]);
}
// Send a new follow request to be sure that the connection still exists
if (($uid != 0) && DBA::exists('contact', ['id' => $cid, 'rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::ACTIVITYPUB])) {
Logger::info('Contact had been switched to ActivityPub. Sending a new follow request.', ['uid' => $uid, 'url' => $url]);
ActivityPub\Transmitter::sendActivity('Follow', $url, $uid);
}
}
/**
*
*
* @param $receivers
* @param $actor
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
private static function switchContacts($receivers, $actor)
{
if (empty($actor)) {
return;
}
foreach ($receivers as $receiver) {
$contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver['uid'], 'network' => Protocol::OSTATUS, 'nurl' => Strings::normaliseLink($actor)]);
if (DBA::isResult($contact)) {
self::switchContact($contact['id'], $receiver['uid'], $actor);
}
$contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver['uid'], 'network' => Protocol::OSTATUS, 'alias' => [Strings::normaliseLink($actor), $actor]]);
if (DBA::isResult($contact)) {
self::switchContact($contact['id'], $receiver['uid'], $actor);
}
}
}
/**
*
*
* @param $object_data
* @param array $activity
*
* @return mixed
*/
private static function addActivityFields($object_data, $activity)
{
if (!empty($activity['published']) && empty($object_data['published'])) {
$object_data['published'] = JsonLD::fetchElement($activity, 'as:published', '@value');
}
if (!empty($activity['diaspora:guid']) && empty($object_data['diaspora:guid'])) {
$object_data['diaspora:guid'] = JsonLD::fetchElement($activity, 'diaspora:guid', '@value');
}
$object_data['service'] = JsonLD::fetchElement($activity, 'as:instrument', 'as:name', '@type', 'as:Service');
$object_data['service'] = JsonLD::fetchElement($object_data, 'service', '@value');
if (!empty($object_data['object_id'])) {
// Some systems (e.g. GNU Social) don't reply to the "id" field but the "uri" field.
$objectId = Item::getURIByLink($object_data['object_id']);
if (!empty($objectId) && ($object_data['object_id'] != $objectId)) {
Logger::notice('Fix wrong object-id', ['received' => $object_data['object_id'], 'correct' => $objectId]);
$object_data['object_id'] = $objectId;
}
}
return $object_data;
}
/**
* Fetches the object data from external ressources if needed
*
* @param string $object_id Object ID of the the provided object
* @param array $object The provided object array
* @param boolean $trust_source Do we trust the provided object?
* @param integer $uid User ID for the signature that we use to fetch data
*
* @return array|false with trusted and valid object data
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
private static function fetchObject(string $object_id, array $object = [], bool $trust_source = false, int $uid = 0)
{
// By fetching the type we check if the object is complete.
$type = JsonLD::fetchElement($object, '@type');
if (!$trust_source || empty($type)) {
$data = ActivityPub::fetchContent($object_id, $uid);
if (!empty($data)) {
$object = JsonLD::compact($data);
Logger::log('Fetched content for ' . $object_id, Logger::DEBUG);
} else {
Logger::log('Empty content for ' . $object_id . ', check if content is available locally.', Logger::DEBUG);
$item = Item::selectFirst([], ['uri' => $object_id]);
if (!DBA::isResult($item)) {
Logger::log('Object with url ' . $object_id . ' was not found locally.', Logger::DEBUG);
return false;
}
Logger::log('Using already stored item for url ' . $object_id, Logger::DEBUG);
$data = ActivityPub\Transmitter::createNote($item);
$object = JsonLD::compact($data);
}
$id = JsonLD::fetchElement($object, '@id');
if (empty($id)) {
Logger::info('Empty id');
return false;
}
if ($id != $object_id) {
Logger::info('Fetched id differs from provided id', ['provided' => $object_id, 'fetched' => $id]);
return false;
}
} else {
Logger::log('Using original object for url ' . $object_id, Logger::DEBUG);
}
$type = JsonLD::fetchElement($object, '@type');
if (empty($type)) {
Logger::info('Empty type');
return false;
}
// We currently don't handle 'pt:CacheFile', but with this step we avoid logging
if (in_array($type, self::CONTENT_TYPES) || ($type == 'pt:CacheFile')) {
$object_data = self::processObject($object);
if (!empty($data)) {
$object_data['raw'] = json_encode($data);
}
return $object_data;
}
if ($type == 'as:Announce') {
$object_id = JsonLD::fetchElement($object, 'object', '@id');
if (empty($object_id) || !is_string($object_id)) {
return false;
}
return self::fetchObject($object_id, [], false, $uid);
}
Logger::log('Unhandled object type: ' . $type, Logger::DEBUG);
return false;
}
/**
* Convert tags from JSON-LD format into a simplified format
*
* @param array $tags Tags in JSON-LD format
*
* @return array with tags in a simplified format
*/
private static function processTags(array $tags)
{
$taglist = [];
foreach ($tags as $tag) {
if (empty($tag)) {
continue;
}
$element = ['type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type')),
'href' => JsonLD::fetchElement($tag, 'as:href', '@id'),
'name' => JsonLD::fetchElement($tag, 'as:name', '@value')];
if (empty($element['type'])) {
continue;
}
if (empty($element['href'])) {
$element['href'] = $element['name'];
}
$taglist[] = $element;
}
return $taglist;
}
/**
* Convert emojis from JSON-LD format into a simplified format
*
* @param array $emojis
* @return array with emojis in a simplified format
*/
private static function processEmojis(array $emojis)
{
$emojilist = [];
foreach ($emojis as $emoji) {
if (empty($emoji) || (JsonLD::fetchElement($emoji, '@type') != 'toot:Emoji') || empty($emoji['as:icon'])) {
continue;
}
$url = JsonLD::fetchElement($emoji['as:icon'], 'as:url', '@id');
$element = ['name' => JsonLD::fetchElement($emoji, 'as:name', '@value'),
'href' => $url];
$emojilist[] = $element;
}
return $emojilist;
}
/**
* Convert attachments from JSON-LD format into a simplified format
*
* @param array $attachments Attachments in JSON-LD format
*
* @return array Attachments in a simplified format
*/
private static function processAttachments(array $attachments)
{
$attachlist = [];
// Removes empty values
$attachments = array_filter($attachments);
foreach ($attachments as $attachment) {
switch (JsonLD::fetchElement($attachment, '@type')) {
case 'as:Page':
$pageUrl = null;
$pageImage = null;
$urls = JsonLD::fetchElementArray($attachment, 'as:url');
foreach ($urls as $url) {
// Single scalar URL case
if (is_string($url)) {
$pageUrl = $url;
continue;
}
$href = JsonLD::fetchElement($url, 'as:href', '@id');
$mediaType = JsonLD::fetchElement($url, 'as:mediaType', '@value');
if (Strings::startsWith($mediaType, 'image')) {
$pageImage = $href;
} else {
$pageUrl = $href;
}
}
$attachlist[] = [
'type' => 'link',
'title' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
'desc' => JsonLD::fetchElement($attachment, 'as:summary', '@value'),
'url' => $pageUrl,
'image' => $pageImage,
];
break;
case 'as:Link':
$attachlist[] = [
'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
'mediaType' => JsonLD::fetchElement($attachment, 'as:mediaType', '@value'),
'name' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
'url' => JsonLD::fetchElement($attachment, 'as:href', '@id')
];
break;
case 'as:Image':
$mediaType = JsonLD::fetchElement($attachment, 'as:mediaType', '@value');
$imageFullUrl = JsonLD::fetchElement($attachment, 'as:url', '@id');
$imagePreviewUrl = null;
// Multiple URLs?
if (!$imageFullUrl && ($urls = JsonLD::fetchElementArray($attachment, 'as:url'))) {
$imageVariants = [];
$previewVariants = [];
foreach ($urls as $url) {
// Scalar URL, no discrimination possible
if (is_string($url)) {
$imageFullUrl = $url;
continue;
}
// Not sure what to do with a different Link media type than the base Image, we skip
if ($mediaType != JsonLD::fetchElement($url, 'as:mediaType', '@value')) {
continue;
}
$href = JsonLD::fetchElement($url, 'as:href', '@id');
// Default URL choice if no discriminating width is provided
$imageFullUrl = $href ?? $imageFullUrl;
$width = intval(JsonLD::fetchElement($url, 'as:width', '@value') ?? 1);
if ($href && $width) {
$imageVariants[$width] = $href;
// 632 is the ideal width for full screen frio posts, we compute the absolute distance to it
$previewVariants[abs(632 - $width)] = $href;
}
}
if ($imageVariants) {
// Taking the maximum size image
ksort($imageVariants);
$imageFullUrl = array_pop($imageVariants);
// Taking the minimum number distance to the target distance
ksort($previewVariants);
$imagePreviewUrl = array_shift($previewVariants);
}
unset($imageVariants);
unset($previewVariants);
}
$attachlist[] = [
'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
'mediaType' => $mediaType,
'name' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
'url' => $imageFullUrl,
'image' => $imagePreviewUrl !== $imageFullUrl ? $imagePreviewUrl : null,
];
break;
default:
$attachlist[] = [
'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
'mediaType' => JsonLD::fetchElement($attachment, 'as:mediaType', '@value'),
'name' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
'url' => JsonLD::fetchElement($attachment, 'as:url', '@id')
];
}
}
return $attachlist;
}
/**
* Fetch the original source or content with the "language" Markdown or HTML
*
* @param array $object
* @param array $object_data
*
* @return array
* @throws \Exception
*/
private static function getSource($object, $object_data)
{
$object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/bbcode');
$object_data['source'] = JsonLD::fetchElement($object_data, 'source', '@value');
if (!empty($object_data['source'])) {
return $object_data;
}
$object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/markdown');
$object_data['source'] = JsonLD::fetchElement($object_data, 'source', '@value');
if (!empty($object_data['source'])) {
$object_data['source'] = Markdown::toBBCode($object_data['source']);
return $object_data;
}
$object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/html');
$object_data['source'] = JsonLD::fetchElement($object_data, 'source', '@value');
if (!empty($object_data['source'])) {
$object_data['source'] = HTML::toBBCode($object_data['source']);
return $object_data;
}
return $object_data;
}
/**
* Check if the "as:url" element is an array with multiple links
* This is the case with audio and video posts.
* Then the links are added as attachments
*
* @param array $object The raw object
* @param array $object_data The parsed object data for later processing
* @return array the object data
*/
private static function processAttachmentUrls(array $object, array $object_data) {
// Check if this is some url with multiple links
if (empty($object['as:url'])) {
return $object_data;
}
$urls = $object['as:url'];
$keys = array_keys($urls);
if (!is_numeric(array_pop($keys))) {
return $object_data;
}
$attachments = [];
foreach ($urls as $url) {
if (empty($url['@type']) || ($url['@type'] != 'as:Link')) {
continue;
}
$href = JsonLD::fetchElement($url, 'as:href', '@id');
if (empty($href)) {
continue;
}
$mediatype = JsonLD::fetchElement($url, 'as:mediaType');
if (empty($mediatype)) {
continue;
}
if ($mediatype == 'text/html') {
$object_data['alternate-url'] = $href;
}
$filetype = strtolower(substr($mediatype, 0, strpos($mediatype, '/')));
if ($filetype == 'audio') {
$attachments[$filetype] = ['type' => $mediatype, 'url' => $href];
} elseif ($filetype == 'video') {
$height = (int)JsonLD::fetchElement($url, 'as:height', '@value');
// We save bandwidth by using a moderate height
// Peertube normally uses these heights: 240, 360, 480, 720, 1080
if (!empty($attachments[$filetype]['height']) &&
(($height > 480) || $height < $attachments[$filetype]['height'])) {
continue;
}
$attachments[$filetype] = ['type' => $mediatype, 'url' => $href, 'height' => $height];
}
}
foreach ($attachments as $type => $attachment) {
$object_data['attachments'][] = ['type' => $type,
'mediaType' => $attachment['type'],
'name' => '',
'url' => $attachment['url']];
}
return $object_data;
}
/**
* Fetches data from the object part of an activity
*
* @param array $object
*
* @return array
* @throws \Exception
*/
private static function processObject($object)
{
if (!JsonLD::fetchElement($object, '@id')) {
return false;
}
$object_data = [];
$object_data['object_type'] = JsonLD::fetchElement($object, '@type');
$object_data['id'] = JsonLD::fetchElement($object, '@id');
$object_data['reply-to-id'] = JsonLD::fetchElement($object, 'as:inReplyTo', '@id');
// An empty "id" field is translated to "./" by the compactor, so we have to check for this content
if (empty($object_data['reply-to-id']) || ($object_data['reply-to-id'] == './')) {
$object_data['reply-to-id'] = $object_data['id'];
} else {
// Some systems (e.g. GNU Social) don't reply to the "id" field but the "uri" field.
$replyToId = Item::getURIByLink($object_data['reply-to-id']);
if (!empty($replyToId) && ($object_data['reply-to-id'] != $replyToId)) {
Logger::notice('Fix wrong reply-to', ['received' => $object_data['reply-to-id'], 'correct' => $replyToId]);
$object_data['reply-to-id'] = $replyToId;
}
}
$object_data['published'] = JsonLD::fetchElement($object, 'as:published', '@value');
$object_data['updated'] = JsonLD::fetchElement($object, 'as:updated', '@value');
if (empty($object_data['updated'])) {
$object_data['updated'] = $object_data['published'];
}
if (empty($object_data['published']) && !empty($object_data['updated'])) {
$object_data['published'] = $object_data['updated'];
}
$actor = JsonLD::fetchElement($object, 'as:attributedTo', '@id');
if (empty($actor)) {
$actor = JsonLD::fetchElement($object, 'as:actor', '@id');
}
$location = JsonLD::fetchElement($object, 'as:location', 'as:name', '@type', 'as:Place');
$location = JsonLD::fetchElement($location, 'location', '@value');
if ($location) {
// Some AP software allow formatted text in post location, so we run all the text converters we have to boil
// down to HTML and then finally format to plaintext.
$location = Markdown::convert($location);
$location = BBCode::convert($location);
$location = HTML::toPlaintext($location);
}
$object_data['sc:identifier'] = JsonLD::fetchElement($object, 'sc:identifier', '@value');
$object_data['diaspora:guid'] = JsonLD::fetchElement($object, 'diaspora:guid', '@value');
$object_data['diaspora:comment'] = JsonLD::fetchElement($object, 'diaspora:comment', '@value');
$object_data['diaspora:like'] = JsonLD::fetchElement($object, 'diaspora:like', '@value');
$object_data['actor'] = $object_data['author'] = $actor;
$object_data['context'] = JsonLD::fetchElement($object, 'as:context', '@id');
$object_data['conversation'] = JsonLD::fetchElement($object, 'ostatus:conversation', '@id');
$object_data['sensitive'] = JsonLD::fetchElement($object, 'as:sensitive');
$object_data['name'] = JsonLD::fetchElement($object, 'as:name', '@value');
$object_data['summary'] = JsonLD::fetchElement($object, 'as:summary', '@value');
$object_data['content'] = JsonLD::fetchElement($object, 'as:content', '@value');
$object_data = self::getSource($object, $object_data);
$object_data['start-time'] = JsonLD::fetchElement($object, 'as:startTime', '@value');
$object_data['end-time'] = JsonLD::fetchElement($object, 'as:endTime', '@value');
$object_data['location'] = $location;
$object_data['latitude'] = JsonLD::fetchElement($object, 'as:location', 'as:latitude', '@type', 'as:Place');
$object_data['latitude'] = JsonLD::fetchElement($object_data, 'latitude', '@value');
$object_data['longitude'] = JsonLD::fetchElement($object, 'as:location', 'as:longitude', '@type', 'as:Place');
$object_data['longitude'] = JsonLD::fetchElement($object_data, 'longitude', '@value');
$object_data['attachments'] = self::processAttachments(JsonLD::fetchElementArray($object, 'as:attachment') ?? []);
$object_data['tags'] = self::processTags(JsonLD::fetchElementArray($object, 'as:tag') ?? []);
$object_data['emojis'] = self::processEmojis(JsonLD::fetchElementArray($object, 'as:tag', 'toot:Emoji') ?? []);
$object_data['generator'] = JsonLD::fetchElement($object, 'as:generator', 'as:name', '@type', 'as:Application');
$object_data['generator'] = JsonLD::fetchElement($object_data, 'generator', '@value');
$object_data['alternate-url'] = JsonLD::fetchElement($object, 'as:url', '@id');
// Special treatment for Hubzilla links
if (is_array($object_data['alternate-url'])) {
$object_data['alternate-url'] = JsonLD::fetchElement($object_data['alternate-url'], 'as:href', '@id');
if (!is_string($object_data['alternate-url'])) {
$object_data['alternate-url'] = JsonLD::fetchElement($object['as:url'], 'as:href', '@id');
}
}
if (in_array($object_data['object_type'], ['as:Audio', 'as:Video'])) {
$object_data = self::processAttachmentUrls($object, $object_data);
}
$receiverdata = self::getReceivers($object, $object_data['actor'], $object_data['tags'], true);
$receivers = $reception_types = [];
foreach ($receiverdata as $key => $data) {
$receivers[$key] = $data['uid'];
$reception_types[$data['uid']] = $data['type'] ?? 0;
}
$object_data['receiver'] = $receivers;
$object_data['reception_type'] = $reception_types;
$object_data['unlisted'] = in_array(-1, $object_data['receiver']);
unset($object_data['receiver']['uid:-1']);
// Common object data:
// Unhandled
// @context, type, actor, signature, mediaType, duration, replies, icon
// Also missing: (Defined in the standard, but currently unused)
// audience, preview, endTime, startTime, image
// Data in Notes:
// Unhandled
// contentMap, announcement_count, announcements, context_id, likes, like_count
// inReplyToStatusId, shares, quoteUrl, statusnetConversationId
// Data in video:
// To-Do?
// category, licence, language, commentsEnabled
// Unhandled
// views, waitTranscoding, state, support, subtitleLanguage
// likes, dislikes, shares, comments
return $object_data;
}
}