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
/**
* @file src/Protocol/ActivityPub/Receiver.php
*/
namespace Friendica\Protocol\ActivityPub;
use Friendica\Database\DBA;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Model\Contact;
use Friendica\Model\APContact;
use Friendica\Model\Conversation;
use Friendica\Model\Item;
use Friendica\Model\User;
use Friendica\Protocol\ActivityPub;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\HTTPSignature;
use Friendica\Util\JsonLD;
use Friendica\Util\LDSignature;
use Friendica\Util\Strings;
/**
* @brief ActivityPub Receiver Protocol class
*
* To-Do:
* - 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'];
const ACTIVITY_TYPES = ['as:Like', 'as:Dislike', 'as:Accept', 'as:Reject', 'as:TentativeAccept'];
/**
* Checks if the web request is done for the AP protocol
*
* @return bool is it AP?
*/
public static function isRequest()
{
return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
stristr(defaults($_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)
{
$http_signer = HTTPSignature::getSigner($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]);
}
$activity = json_decode($body, true);
if (empty($activity)) {
Logger::warning('Invalid body.');
return;
}
$ldactivity = JsonLD::compact($activity);
$actor = JsonLD::fetchElement($ldactivity, 'as:actor', '@id');
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 ' . $actor, Logger::DEBUG);
}
if (!empty($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);
}
/**
* 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
* @param integer $uid User ID
* @param $trust_source
*
* @return array with object data
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
private static function prepareObjectData($activity, $uid, &$trust_source)
{
$actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
if (empty($actor)) {
Logger::log('Empty actor', Logger::DEBUG);
return [];
}
$type = JsonLD::fetchElement($activity, '@type');
// 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)) {
$additional = ['uid:' . $uid => $uid];
$receivers = array_merge($receivers, $additional);
} else {
// We possibly need some user to fetch private content,
// so we fetch the first out ot the list.
$uid = self::getFirstUserFromReceivers($receivers);
}
Logger::log('Receivers: ' . $uid . ' - ' . json_encode($receivers), Logger::DEBUG);
$object_id = JsonLD::fetchElement($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'])) {
if ($type == 'as:Announce') {
$trust_source = false;
}
$object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source, $uid);
if (empty($object_data)) {
Logger::log("Object data couldn't be processed", Logger::DEBUG);
return [];
}
$object_data['object_id'] = $object_id;
// 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');
}
// We had been able to retrieve the object data - so we can trust the source
$trust_source = true;
} elseif (in_array($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') {
$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;
$object_data['receiver'] = array_merge(defaults($object_data, 'receiver', []), $receivers);
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;
}
/**
* Store the unprocessed data into the conversation table
* This has to be done outside the regular function,
* since we store everything - not only item posts.
*
* @param array $activity Array with activity data
* @param string $body The raw message
* @throws \Exception
*/
private static function storeConversation($activity, $body)
{
if (empty($body) || empty($activity['id'])) {
return;
}
$conversation = [
'protocol' => Conversation::PARCEL_ACTIVITYPUB,
'item-uri' => $activity['id'],
'reply-to-uri' => defaults($activity, 'reply-to-id', ''),
'conversation-href' => defaults($activity, 'context', ''),
'conversation-uri' => defaults($activity, 'conversation', ''),
'source' => $body,
'received' => DateTimeFormat::utcNow()];
DBA::insert('conversation', $conversation, true);
}
/**
* Processes the activity object
*
* @param array $activity Array with activity data
* @param string $body
* @param integer $uid User ID
* @param boolean $trust_source Do we trust the source?
* @throws \Exception
*/
public static function processActivity($activity, $body = '', $uid = null, $trust_source = false)
{
$type = JsonLD::fetchElement($activity, '@type');
if (!$type) {
Logger::log('Empty type', Logger::DEBUG);
return;
}
if (!JsonLD::fetchElement($activity, 'as:object', '@id')) {
Logger::log('Empty object', Logger::DEBUG);
return;
}
if (!JsonLD::fetchElement($activity, 'as:actor', '@id')) {
Logger::log('Empty actor', Logger::DEBUG);
return;
}
// Don't trust the source if "actor" differs from "attributedTo". The content could be forged.
if ($trust_source && ($type == 'as:Create') && is_array($activity['as:object'])) {
$actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
$attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
$trust_source = ($actor == $attributed_to);
if (!$trust_source) {
Logger::log('Not trusting actor: ' . $actor . '. It differs from attributedTo: ' . $attributed_to, Logger::DEBUG);
}
}
// $trust_source is called by reference and is set to true if the content was retrieved successfully
$object_data = self::prepareObjectData($activity, $uid, $trust_source);
if (empty($object_data)) {
Logger::log('No object data found', Logger::DEBUG);
return;
}
if (!$trust_source) {
Logger::log('No trust for activity type "' . $type . '", so we quit now.', Logger::DEBUG);
return;
}
// Only store content related stuff - and no announces, since they possibly overwrite the original content
if (in_array($object_data['object_type'], self::CONTENT_TYPES) && ($type != 'as:Announce')) {
self::storeConversation($object_data, $body);
}
// Internal flag for thread completion. See Processor.php
if (!empty($activity['thread-completion'])) {
$object_data['thread-completion'] = $activity['thread-completion'];
}
switch ($type) {
case 'as:Create':
if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
ActivityPub\Processor::createItem($object_data);
}
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)) {
$profile = APContact::getByURL($object_data['actor']);
if ($profile['type'] == 'Person') {
// Reshared posts from persons appear as summary at the bottom
// If this isn't set, then a single reshare appears on top. This is used for groups.
$object_data['thread-completion'] = true;
}
ActivityPub\Processor::createItem($object_data);
// Add the bottom reshare information only for persons
if ($profile['type'] == 'Person') {
$announce_object_data = self::processObject($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'] = $object_data['object_type'];
ActivityPub\Processor::createActivity($announce_object_data, ACTIVITY2_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 $tags
*
* @return array with receivers (user id)
* @throws \Exception
*/
private static function getReceivers($activity, $actor, $tags = [])
{
$receivers = [];
// When it is an answer, we inherite the receivers from the parent
$replyto = JsonLD::fetchElement($activity, 'as:inReplyTo', '@id');
if (!empty($replyto)) {
$parents = Item::select(['uid'], ['uri' => $replyto]);
while ($parent = Item::fetch($parents)) {
$receivers['uid:' . $parent['uid']] = $parent['uid'];
}
}
if (!empty($actor)) {
$profile = APContact::getByURL($actor);
$followers = defaults($profile, 'followers', '');
Logger::log('Actor: ' . $actor . ' - Followers: ' . $followers, Logger::DEBUG);
} else {
Logger::log('Empty actor', Logger::DEBUG);
$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) {
$receivers['uid:0'] = 0;
}
if (($receiver == self::PUBLIC_COLLECTION) && !empty($actor)) {
// This will most likely catch all OStatus connections to Mastodon
$condition = ['alias' => [$actor, Strings::normaliseLink($actor)], 'rel' => [Contact::SHARING, Contact::FRIEND]
, 'archive' => false, 'pending' => false];
$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_COLLECTION]) && !empty($actor)) {
$receivers = array_merge($receivers, self::getReceiverForActor($actor, $tags));
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;
}
}
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
self::switchContacts($receivers, $actor);
return $receivers;
}
/**
* Fetch the receiver list of a given actor
*
* @param string $actor
* @param array $tags
*
* @return array with receivers (user id)
* @throws \Exception
*/
public static function getReceiverForActor($actor, $tags)
{
$receivers = [];
$networks = Protocol::FEDERATED;
$condition = ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
'network' => $networks, 'archive' => false, 'pending' => false];
$contacts = DBA::select('contact', ['uid', 'rel'], $condition);
while ($contact = DBA::fetch($contacts)) {
if (self::isValidReceiverForActor($contact, $actor, $tags)) {
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
DBA::close($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)
{
$profile = ActivityPub::probeProfile($url);
if (empty($profile)) {
return;
}
Logger::log('Switch contact ' . $cid . ' (' . $profile['url'] . ') for user ' . $uid . ' to ActivityPub');
$photo = defaults($profile, 'photo', null);
unset($profile['photo']);
unset($profile['baseurl']);
unset($profile['guid']);
$profile['nurl'] = Strings::normaliseLink($profile['url']);
DBA::update('contact', $profile, ['id' => $cid]);
Contact::updateAvatar($photo, $uid, $cid);
// Send a new follow request to be sure that the connection still exists
if (($uid != 0) && DBA::exists('contact', ['id' => $cid, 'rel' => [Contact::SHARING, Contact::FRIEND]])) {
ActivityPub\Transmitter::sendActivity('Follow', $profile['url'], $uid);
Logger::log('Send a new follow request to ' . $profile['url'] . ' for user ' . $uid, Logger::DEBUG);
}
}
/**
*
*
* @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' => $receiver, 'network' => Protocol::OSTATUS, 'nurl' => Strings::normaliseLink($actor)]);
if (DBA::isResult($contact)) {
self::switchContact($contact['id'], $receiver, $actor);
}
$contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'alias' => [Strings::normaliseLink($actor), $actor]]);
if (DBA::isResult($contact)) {
self::switchContact($contact['id'], $receiver, $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');
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);
}
} else {
Logger::log('Using original object for url ' . $object_id, Logger::DEBUG);
}
$type = JsonLD::fetchElement($object, '@type');
if (empty($type)) {
Logger::log('Empty type', Logger::DEBUG);
return false;
}
if (in_array($type, self::CONTENT_TYPES)) {
return self::processObject($object);
}
if ($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 $tags Tags in JSON-LD format
*
* @return array with tags in a simplified format
*/
private static function processTags($tags)
{
$taglist = [];
if (empty($tags)) {
return [];
}
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;
}
$taglist[] = $element;
}
return $taglist;
}
/**
* Convert emojis from JSON-LD format into a simplified format
*
* @param $emojis
* @return array with emojis in a simplified format
*/
private static function processEmojis($emojis)
{
$emojilist = [];
if (empty($emojis)) {
return [];
}
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 $attachments Attachments in JSON-LD format
*
* @return array with attachmants in a simplified format
*/
private static function processAttachments($attachments)
{
$attachlist = [];
if (empty($attachments)) {
return [];
}
foreach ($attachments as $attachment) {
if (empty($attachment)) {
continue;
}
$attachlist[] = ['type' => str_replace('as:', '', JsonLD::fetchElement($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;
}
/**
* 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'];
}
$object_data['published'] = JsonLD::fetchElement($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');
}
$object_data['diaspora:guid'] = JsonLD::fetchElement($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');
$object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/bbcode');
$object_data['source'] = JsonLD::fetchElement($object_data, 'source', '@value');
$object_data['start-time'] = JsonLD::fetchElement($object, 'as:startTime', '@value');
$object_data['end-time'] = JsonLD::fetchElement($object, 'as:endTime', '@value');
$object_data['location'] = JsonLD::fetchElement($object, 'as:location', 'as:name', '@type', 'as:Place');
$object_data['location'] = JsonLD::fetchElement($object_data, 'location', '@value');
$object_data['latitude'] = JsonLD::fetchElement($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');
}
}
$object_data['receiver'] = self::getReceivers($object, $object_data['actor'], $object_data['tags']);
// 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;
}
}