friendica-github/src/Protocol/ActivityPub/Receiver.php

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<?php
/**
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* @file src/Protocol/ActivityPub/Receiver.php
*/
namespace Friendica\Protocol\ActivityPub;
use Friendica\Database\DBA;
use Friendica\Util\HTTPSignature;
use Friendica\Core\Protocol;
use Friendica\Model\Contact;
use Friendica\Model\APContact;
use Friendica\Model\Item;
use Friendica\Model\User;
use Friendica\Util\JsonLD;
use Friendica\Util\LDSignature;
use Friendica\Protocol\ActivityPub;
/**
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* @brief ActivityPub Receiver Protocol class
*
* To-Do:
* - Update (Image, Video, Article, Note)
* - Event
* - Undo Announce
*
* Check what this is meant to do:
* - Add
* - Block
* - Flag
* - Remove
* - Undo Block
* - Undo Accept (Problem: This could invert a contact accept or an event accept)
*
* General:
* - Possibly using the LD-JSON parser
*/
class Receiver
{
/**
* @brief Checks if the web request is done for the AP protocol
*
* @return is it AP?
*/
public static function isRequest()
{
return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
}
/**
* @brief
*
* @param $body
* @param $header
* @param integer $uid User ID
*/
public static function processInbox($body, $header, $uid)
{
$http_signer = HTTPSignature::getSigner($body, $header);
if (empty($http_signer)) {
logger('Invalid HTTP signature, message will be discarded.', LOGGER_DEBUG);
return;
} else {
logger('HTTP signature is signed by ' . $http_signer, LOGGER_DEBUG);
}
$activity = json_decode($body, true);
$actor = JsonLD::fetchElement($activity, 'actor', 'id');
logger('Message for user ' . $uid . ' is from actor ' . $actor, LOGGER_DEBUG);
if (empty($activity)) {
logger('Invalid body.', LOGGER_DEBUG);
return;
}
if (LDSignature::isSigned($activity)) {
$ld_signer = LDSignature::getSigner($activity);
if (empty($ld_signer)) {
logger('Invalid JSON-LD signature from ' . $actor, LOGGER_DEBUG);
}
if (!empty($ld_signer && ($actor == $http_signer))) {
logger('The HTTP and the JSON-LD signature belong to ' . $ld_signer, LOGGER_DEBUG);
$trust_source = true;
} elseif (!empty($ld_signer)) {
logger('JSON-LD signature is signed by ' . $ld_signer, LOGGER_DEBUG);
$trust_source = true;
} elseif ($actor == $http_signer) {
logger('Bad JSON-LD signature, but HTTP signer fits the actor.', LOGGER_DEBUG);
$trust_source = true;
} else {
logger('Invalid JSON-LD signature and the HTTP signer is different.', LOGGER_DEBUG);
$trust_source = false;
}
} elseif ($actor == $http_signer) {
logger('Trusting post without JSON-LD signature, The actor fits the HTTP signer.', LOGGER_DEBUG);
$trust_source = true;
} else {
logger('No JSON-LD signature, different actor.', LOGGER_DEBUG);
$trust_source = false;
}
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self::processActivity($activity, $body, $uid, $trust_source);
}
/**
* @brief
*
* @param array $activity
* @param integer $uid User ID
* @param $trust_source
*
* @return
*/
private static function prepareObjectData($activity, $uid, &$trust_source)
{
$actor = JsonLD::fetchElement($activity, 'actor', 'id');
if (empty($actor)) {
logger('Empty actor', LOGGER_DEBUG);
return [];
}
// Fetch all receivers from to, cc, bto and bcc
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$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);
$object_id = JsonLD::fetchElement($activity, 'object', 'id');
if (empty($object_id)) {
logger('No object found', LOGGER_DEBUG);
return [];
}
// Fetch the content only on activities where this matters
if (in_array($activity['type'], ['Create', 'Announce'])) {
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$object_data = self::fetchObject($object_id, $activity['object'], $trust_source);
if (empty($object_data)) {
logger("Object data couldn't be processed", LOGGER_DEBUG);
return [];
}
// We had been able to retrieve the object data - so we can trust the source
$trust_source = true;
} elseif (in_array($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.
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$object_data = self::processObject($activity);
$object_data['name'] = $activity['type'];
$object_data['author'] = $activity['actor'];
$object_data['object'] = $object_id;
$object_data['object_type'] = ''; // Since we don't fetch the object, we don't know the type
} else {
$object_data = [];
$object_data['id'] = $activity['id'];
$object_data['object'] = $activity['object'];
$object_data['object_type'] = JsonLD::fetchElement($activity, 'object', 'type');
}
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$object_data = self::addActivityFields($object_data, $activity);
$object_data['type'] = $activity['type'];
$object_data['owner'] = $actor;
$object_data['receiver'] = array_merge(defaults($object_data, 'receiver', []), $receivers);
logger('Processing ' . $object_data['type'] . ' ' . $object_data['object_type'] . ' ' . $object_data['id'], LOGGER_DEBUG);
return $object_data;
}
/**
* @brief
*
* @param array $activity
* @param $body
* @param integer $uid User ID
* @param $trust_source
*/
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public static function processActivity($activity, $body = '', $uid = null, $trust_source = false)
{
if (empty($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;
}
// $trust_source is called by reference and is set to true if the content was retrieved successfully
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$object_data = self::prepareObjectData($activity, $uid, $trust_source);
if (empty($object_data)) {
logger('No object data found', LOGGER_DEBUG);
return;
}
if (!$trust_source) {
logger('No trust for activity type "' . $activity['type'] . '", so we quit now.', LOGGER_DEBUG);
}
switch ($activity['type']) {
case 'Create':
case 'Announce':
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ActivityPub\Processor::createItem($object_data, $body);
break;
case 'Like':
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ActivityPub\Processor::likeItem($object_data, $body);
break;
case 'Dislike':
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ActivityPub\Processor::dislikeItem($object_data, $body);
break;
case 'Update':
if (in_array($object_data['object_type'], ActivityPub::CONTENT_TYPES)) {
/// @todo
} elseif (in_array($object_data['object_type'], ActivityPub::ACCOUNT_TYPES)) {
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ActivityPub\Processor::updatePerson($object_data, $body);
}
break;
case 'Delete':
if ($object_data['object_type'] == 'Tombstone') {
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ActivityPub\Processor::deleteItem($object_data, $body);
} elseif (in_array($object_data['object_type'], ActivityPub::ACCOUNT_TYPES)) {
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ActivityPub\Processor::deletePerson($object_data, $body);
}
break;
case 'Follow':
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ActivityPub\Processor::followUser($object_data);
break;
case 'Accept':
if ($object_data['object_type'] == 'Follow') {
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ActivityPub\Processor::acceptFollowUser($object_data);
}
break;
case 'Reject':
if ($object_data['object_type'] == 'Follow') {
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ActivityPub\Processor::rejectFollowUser($object_data);
}
break;
case 'Undo':
if ($object_data['object_type'] == 'Follow') {
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ActivityPub\Processor::undoFollowUser($object_data);
} elseif (in_array($object_data['object_type'], ActivityPub::ACTIVITY_TYPES)) {
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ActivityPub\Processor::undoActivity($object_data);
}
break;
default:
logger('Unknown activity: ' . $activity['type'], LOGGER_DEBUG);
break;
}
}
/**
* @brief
*
* @param array $activity
* @param $actor
*
* @return
*/
private static function getReceivers($activity, $actor)
{
$receivers = [];
// When it is an answer, we inherite the receivers from the parent
$replyto = JsonLD::fetchElement($activity, '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('Actor: ' . $actor . ' - Followers: ' . $followers, LOGGER_DEBUG);
} else {
logger('Empty actor', LOGGER_DEBUG);
$followers = '';
}
foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
if (empty($activity[$element])) {
continue;
}
// The receiver can be an array or a string
if (is_string($activity[$element])) {
$activity[$element] = [$activity[$element]];
}
foreach ($activity[$element] as $receiver) {
if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
$receivers['uid:0'] = 0;
}
if (($receiver == ActivityPub::PUBLIC_COLLECTION) && !empty($actor)) {
// This will most likely catch all OStatus connections to Mastodon
$condition = ['alias' => [$actor, normalise_link($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, ActivityPub::PUBLIC_COLLECTION]) && !empty($actor)) {
$condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
'network' => Protocol::ACTIVITYPUB, '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);
continue;
}
$condition = ['self' => true, 'nurl' => normalise_link($receiver)];
$contact = DBA::selectFirst('contact', ['uid'], $condition);
if (!DBA::isResult($contact)) {
continue;
}
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
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self::switchContacts($receivers, $actor);
return $receivers;
}
/**
* @brief Switches existing contacts to ActivityPub
*
* @param integer $cid Contact ID
* @param integer $uid User ID
* @param string $url Profile URL
*/
private static function switchContact($cid, $uid, $url)
{
$profile = ActivityPub::probeProfile($url);
if (empty($profile)) {
return;
}
logger('Switch contact ' . $cid . ' (' . $profile['url'] . ') for user ' . $uid . ' to ActivityPub');
$photo = $profile['photo'];
unset($profile['photo']);
unset($profile['baseurl']);
$profile['nurl'] = normalise_link($profile['url']);
DBA::update('contact', $profile, ['id' => $cid]);
Contact::updateAvatar($photo, $uid, $cid);
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// Send a new follow request to be sure that the connection still exists
if (($uid != 0) && DBA::exists('contact', ['id' => $cid, 'rel' => [Contact::SHARING, Contact::FRIEND]])) {
ActivityPub\Transmitter::sendActivity('Follow', $profile['url'], $uid);
logger('Send a new follow request to ' . $profile['url'] . ' for user ' . $uid, LOGGER_DEBUG);
}
}
/**
* @brief
*
* @param $receivers
* @param $actor
*/
private static function switchContacts($receivers, $actor)
{
if (empty($actor)) {
return;
}
foreach ($receivers as $receiver) {
$contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'nurl' => normalise_link($actor)]);
if (DBA::isResult($contact)) {
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self::switchContact($contact['id'], $receiver, $actor);
}
$contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'alias' => [normalise_link($actor), $actor]]);
if (DBA::isResult($contact)) {
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self::switchContact($contact['id'], $receiver, $actor);
}
}
}
/**
* @brief
*
* @param $object_data
* @param array $activity
*
* @return
*/
private static function addActivityFields($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'])) {
$object_data['parent-uri'] = JsonLD::fetchElement($activity, 'inReplyTo', 'id');
}
if (!empty($activity['instrument'])) {
$object_data['service'] = JsonLD::fetchElement($activity, 'instrument', 'name', 'type', 'Service');
}
return $object_data;
}
/**
* @brief
*
* @param $object_id
* @param $object
* @param $trust_source
*
* @return
*/
private static function fetchObject($object_id, $object = [], $trust_source = false)
{
if (!$trust_source || is_string($object)) {
$data = ActivityPub::fetchContent($object_id);
if (empty($data)) {
logger('Empty content for ' . $object_id . ', check if content is available locally.', LOGGER_DEBUG);
$data = $object_id;
} else {
logger('Fetched content for ' . $object_id, LOGGER_DEBUG);
}
} else {
logger('Using original object for url ' . $object_id, 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 ' . $object_id, LOGGER_DEBUG);
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$data = ActivityPub\Transmitter::createNote($item);
}
if (empty($data['type'])) {
logger('Empty type', LOGGER_DEBUG);
return false;
}
if (in_array($data['type'], ActivityPub::CONTENT_TYPES)) {
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return self::processObject($data);
}
if ($data['type'] == 'Announce') {
if (empty($data['object'])) {
return false;
}
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return self::fetchObject($data['object']);
}
logger('Unhandled object type: ' . $data['type'], LOGGER_DEBUG);
}
/**
* @brief
*
* @param $object
*
* @return
*/
private static function processObject($object)
{
if (empty($object['id'])) {
return false;
}
$object_data = [];
$object_data['object_type'] = $object['type'];
$object_data['id'] = $object['id'];
if (!empty($object['inReplyTo'])) {
$object_data['reply-to-id'] = JsonLD::fetchElement($object, 'inReplyTo', 'id');
} else {
$object_data['reply-to-id'] = $object_data['id'];
}
$object_data['published'] = defaults($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'];
}
$actor = JsonLD::fetchElement($object, 'attributedTo', 'id');
if (empty($actor)) {
$actor = defaults($object, 'actor', null);
}
$object_data['diaspora:guid'] = defaults($object, 'diaspora:guid', null);
$object_data['owner'] = $object_data['author'] = $actor;
$object_data['context'] = defaults($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);
$object_data['location'] = JsonLD::fetchElement($object, 'location', 'name', 'type', 'Place');
$object_data['attachments'] = defaults($object, 'attachment', null);
$object_data['tags'] = defaults($object, 'tag', null);
$object_data['service'] = JsonLD::fetchElement($object, 'instrument', 'name', 'type', 'Service');
$object_data['alternate-url'] = JsonLD::fetchElement($object, 'url', 'href');
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$object_data['receiver'] = self::getReceivers($object, $object_data['owner']);
// 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, generator, 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;
}
}