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/Processor.php
*/
namespace Friendica\Protocol\ActivityPub;
use Friendica\Database\DBA;
use Friendica\Content\Text\HTML;
use Friendica\Core\Config;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Model\Contact;
use Friendica\Model\APContact;
use Friendica\Model\Item;
use Friendica\Model\Event;
use Friendica\Model\Term;
use Friendica\Model\User;
use Friendica\Protocol\ActivityPub;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\JsonLD;
use Friendica\Util\Strings;
/**
* ActivityPub Processor Protocol class
*/
class Processor
{
/**
* Converts mentions from Pleroma into the Friendica format
*
* @param string $body
*
* @return string converted body
*/
private static function convertMentions($body)
{
$URLSearchString = "^\[\]";
$body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
return $body;
}
/**
* Replaces emojis in the body
*
* @param array $emojis
* @param string $body
*
* @return string with replaced emojis
*/
public static function replaceEmojis($body, array $emojis)
{
foreach ($emojis as $emoji) {
$replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
$body = str_replace($emoji['name'], $replace, $body);
}
return $body;
}
/**
* Constructs a string with tags for a given tag array
*
* @param array $tags
* @param boolean $sensitive
* @param array $implicit_mentions List of profile URLs to skip
* @return string with tags
*/
private static function constructTagString($tags, $sensitive, array $implicit_mentions)
{
if (empty($tags)) {
return '';
}
$tag_text = '';
foreach ($tags as $tag) {
if (in_array(defaults($tag, 'type', ''), ['Mention', 'Hashtag']) && !in_array($tag['href'], $implicit_mentions)) {
if (!empty($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;
}
/**
* Add attachment data to the item array
*
* @param array $attachments
* @param array $item
*
* @return array array
*/
private static function constructAttachList($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;
}
/**
* Updates a message
*
* @param array $activity Activity array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function updateItem($activity)
{
$item = Item::selectFirst(['uri', 'parent-uri', 'gravity'], ['uri' => $activity['id']]);
if (!DBA::isResult($item)) {
Logger::warning('Unknown item', ['uri' => $activity['id']]);
return;
}
$item['changed'] = DateTimeFormat::utcNow();
$item['edited'] = $activity['updated'];
$item['title'] = HTML::toBBCode($activity['name']);
$item['content-warning'] = HTML::toBBCode($activity['summary']);
$content = HTML::toBBCode($activity['content']);
$content = self::replaceEmojis($content, $activity['emojis']);
$content = self::convertMentions($content);
$implicit_mentions = [];
if (($item['parent-uri'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
$parent = Item::selectFirst(['id', 'author-link', 'alias'], ['uri' => $item['parent-uri']]);
if (!DBA::isResult($parent)) {
Logger::warning('Unknown parent item.', ['uri' => $item['parent-uri']]);
return;
}
$implicit_mentions = self::getImplicitMentionList($parent);
$content = self::removeImplicitMentionsFromBody($content, $implicit_mentions);
}
$item['body'] = $content;
$item['tag'] = self::constructTagString($activity['tags'], $activity['sensitive'], $implicit_mentions);
Item::update($item, ['uri' => $activity['id']]);
}
/**
* Prepares data for a message
*
* @param array $activity Activity array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function createItem($activity)
{
$item = [];
$item['verb'] = ACTIVITY_POST;
$item['parent-uri'] = $activity['reply-to-id'];
if ($activity['reply-to-id'] == $activity['id']) {
$item['gravity'] = GRAVITY_PARENT;
$item['object-type'] = ACTIVITY_OBJ_NOTE;
} else {
$item['gravity'] = GRAVITY_COMMENT;
$item['object-type'] = ACTIVITY_OBJ_COMMENT;
}
if (($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
Logger::log('Parent ' . $activity['reply-to-id'] . ' not found. Try to refetch it.');
self::fetchMissingActivity($activity['reply-to-id'], $activity);
}
$item['diaspora_signed_text'] = defaults($activity, 'diaspora:comment', '');
self::postItem($activity, $item);
}
/**
* Delete items
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function deleteItem($activity)
{
$owner = Contact::getIdForURL($activity['actor']);
Logger::log('Deleting item ' . $activity['object_id'] . ' from ' . $owner, Logger::DEBUG);
Item::delete(['uri' => $activity['object_id'], 'owner-id' => $owner]);
}
/**
* Prepare the item array for an activity
*
* @param array $activity Activity array
* @param string $verb Activity verb
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function createActivity($activity, $verb)
{
$item = [];
$item['verb'] = $verb;
$item['parent-uri'] = $activity['object_id'];
$item['gravity'] = GRAVITY_ACTIVITY;
$item['object-type'] = ACTIVITY_OBJ_NOTE;
$item['diaspora_signed_text'] = defaults($activity, 'diaspora:like', '');
self::postItem($activity, $item);
}
/**
* Create an event
*
* @param array $activity Activity array
* @param array $item
* @throws \Exception
*/
public static function createEvent($activity, $item)
{
$event['summary'] = HTML::toBBCode($activity['name']);
$event['desc'] = HTML::toBBCode($activity['content']);
$event['start'] = $activity['start-time'];
$event['finish'] = $activity['end-time'];
$event['nofinish'] = empty($event['finish']);
$event['location'] = $activity['location'];
$event['adjust'] = true;
$event['cid'] = $item['contact-id'];
$event['uid'] = $item['uid'];
$event['uri'] = $item['uri'];
$event['edited'] = $item['edited'];
$event['private'] = $item['private'];
$event['guid'] = $item['guid'];
$event['plink'] = $item['plink'];
$condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
$ev = DBA::selectFirst('event', ['id'], $condition);
if (DBA::isResult($ev)) {
$event['id'] = $ev['id'];
}
$event_id = Event::store($event);
Logger::log('Event '.$event_id.' was stored', Logger::DEBUG);
}
/**
* Creates an item post
*
* @param array $activity Activity data
* @param array $item item array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
private static function postItem($activity, $item)
{
/// @todo What to do with $activity['context']?
if (($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['parent-uri']])) {
Logger::log('Parent ' . $item['parent-uri'] . ' not found, message will be discarded.', Logger::DEBUG);
return;
}
$item['network'] = Protocol::ACTIVITYPUB;
$item['private'] = !in_array(0, $activity['receiver']);
$item['author-link'] = $activity['author'];
$item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
if (empty($activity['thread-completion'])) {
$item['owner-link'] = $activity['actor'];
$item['owner-id'] = Contact::getIdForURL($activity['actor'], 0, true);
} else {
Logger::log('Ignoring actor because of thread completion.', Logger::DEBUG);
$item['owner-link'] = $item['author-link'];
$item['owner-id'] = $item['author-id'];
}
$item['uri'] = $activity['id'];
$content = HTML::toBBCode($activity['content']);
$content = self::replaceEmojis($content, $activity['emojis']);
$content = self::convertMentions($content);
$implicit_mentions = [];
if (($item['parent-uri'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
$item_private = !in_array(0, $activity['item_receiver']);
$parent = Item::selectFirst(['id', 'private', 'author-link', 'alias'], ['uri' => $item['parent-uri']]);
if (!DBA::isResult($parent)) {
return;
}
if ($item_private && !$parent['private']) {
Logger::log('Item ' . $item['uri'] . ' is private but the parent ' . $item['parent-uri'] . ' is not. So we drop it.');
return;
}
$implicit_mentions = self::getImplicitMentionList($parent);
$content = self::removeImplicitMentionsFromBody($content, $implicit_mentions);
}
$item['created'] = $activity['published'];
$item['edited'] = $activity['updated'];
$item['guid'] = $activity['diaspora:guid'];
$item['title'] = HTML::toBBCode($activity['name']);
$item['content-warning'] = HTML::toBBCode($activity['summary']);
$item['body'] = $content;
if (($activity['object_type'] == 'as:Video') && !empty($activity['alternate-url'])) {
$item['body'] .= "\n[video]" . $activity['alternate-url'] . '[/video]';
}
$item['location'] = $activity['location'];
if (!empty($item['latitude']) && !empty($item['longitude'])) {
$item['coord'] = $item['latitude'] . ' ' . $item['longitude'];
}
$item['tag'] = self::constructTagString($activity['tags'], $activity['sensitive'], $implicit_mentions);
$item['app'] = $activity['generator'];
$item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
$item = self::constructAttachList($activity['attachments'], $item);
if (!empty($activity['source'])) {
$item['body'] = $activity['source'];
}
$stored = false;
foreach ($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);
}
if ($activity['object_type'] == 'as:Event') {
self::createEvent($activity, $item);
}
$item_id = Item::insert($item);
Logger::log('Storing for user ' . $item['uid'] . ': ' . $item_id);
if ($item['uid'] == 0) {
$stored = $item_id;
}
}
// Store send a follow request for every reshare - but only when the item had been stored
if ($stored && !$item['private'] && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
$author = APContact::getByURL($item['owner-link'], false);
// We send automatic follow requests for reshared messages. (We don't need though for forum posts)
if ($author['type'] != 'Group') {
Logger::log('Send follow request for ' . $item['uri'] . ' (' . $stored . ') to ' . $item['author-link'], Logger::DEBUG);
ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
}
}
}
/**
* Fetches missing posts
*
* @param $url
* @param $child
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
private static function fetchMissingActivity($url, $child)
{
if (Config::get('system', 'ostatus_full_threads')) {
return;
}
$uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
$object = ActivityPub::fetchContent($url, $uid);
if (empty($object)) {
Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
return;
}
if (empty($object['id'])) {
Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
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'] = $child['author'];
$activity['object'] = $object;
$activity['published'] = defaults($object, 'published', $child['published']);
$activity['type'] = 'Create';
$ldactivity = JsonLD::compact($activity);
$ldactivity['thread-completion'] = true;
ActivityPub\Receiver::processActivity($ldactivity);
Logger::log('Activity ' . $url . ' had been fetched and processed.');
}
/**
* perform a "follow" request
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function followUser($activity)
{
$uid = User::getIdForURL($activity['object_id']);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (!empty($cid)) {
self::switchContact($cid);
DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
$contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
} else {
$contact = false;
}
$item = ['author-id' => Contact::getIdForURL($activity['actor']),
'author-link' => $activity['actor']];
// Ensure that the contact has got the right network type
self::switchContact($item['author-id']);
Contact::addRelationship($owner, $contact, $item);
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
return;
}
if (empty($contact)) {
DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
}
Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
}
/**
* Update the given profile
*
* @param array $activity
* @throws \Exception
*/
public static function updatePerson($activity)
{
if (empty($activity['object_id'])) {
return;
}
Logger::log('Updating profile for ' . $activity['object_id'], Logger::DEBUG);
APContact::getByURL($activity['object_id'], true);
}
/**
* Delete the given profile
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function deletePerson($activity)
{
if (empty($activity['object_id']) || empty($activity['actor'])) {
Logger::log('Empty object id or actor.', Logger::DEBUG);
return;
}
if ($activity['object_id'] != $activity['actor']) {
Logger::log('Object id does not match actor.', Logger::DEBUG);
return;
}
$contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
while ($contact = DBA::fetch($contacts)) {
Contact::remove($contact['id']);
}
DBA::close($contacts);
Logger::log('Deleted contact ' . $activity['object_id'], Logger::DEBUG);
}
/**
* Accept a follow request
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function acceptFollowUser($activity)
{
$uid = User::getIdForURL($activity['object_actor']);
if (empty($uid)) {
return;
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
return;
}
self::switchContact($cid);
$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::log('Accept contact request from contact ' . $cid . ' for user ' . $uid, Logger::DEBUG);
}
/**
* Reject a follow request
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function rejectFollowUser($activity)
{
$uid = User::getIdForURL($activity['object_actor']);
if (empty($uid)) {
return;
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
return;
}
self::switchContact($cid);
if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING, 'pending' => true])) {
Contact::remove($cid);
Logger::log('Rejected contact request from contact ' . $cid . ' for user ' . $uid . ' - contact had been removed.', Logger::DEBUG);
} else {
Logger::log('Rejected contact request from contact ' . $cid . ' for user ' . $uid . '.', Logger::DEBUG);
}
}
/**
* Undo activity like "like" or "dislike"
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function undoActivity($activity)
{
if (empty($activity['object_id'])) {
return;
}
if (empty($activity['object_actor'])) {
return;
}
$author_id = Contact::getIdForURL($activity['object_actor']);
if (empty($author_id)) {
return;
}
Item::delete(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
}
/**
* Activity to remove a follower
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function undoFollowUser($activity)
{
$uid = User::getIdForURL($activity['object_object']);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
return;
}
self::switchContact($cid);
$contact = DBA::selectFirst('contact', [], ['id' => $cid]);
if (!DBA::isResult($contact)) {
return;
}
Contact::removeFollower($owner, $contact);
Logger::log('Undo following request from contact ' . $cid . ' for user ' . $uid, Logger::DEBUG);
}
/**
* Switches a contact to AP if needed
*
* @param integer $cid Contact ID
* @throws \Exception
*/
private static function switchContact($cid)
{
$contact = DBA::selectFirst('contact', ['network'], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
if (!DBA::isResult($contact) || ($contact['network'] == Protocol::ACTIVITYPUB)) {
return;
}
Logger::log('Change existing contact ' . $cid . ' from ' . $contact['network'] . ' to ActivityPub.');
Contact::updateFromProbe($cid, Protocol::ACTIVITYPUB);
}
/**
* Collects implicit mentions like:
* - the author of the parent item
* - all the mentioned conversants in the parent item
*
* @param array $parent Item array with at least ['id', 'author-link', 'alias']
* @return array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
private static function getImplicitMentionList(array $parent)
{
$parent_terms = Term::tagArrayFromItemId($parent['id'], [TERM_MENTION]);
$implicit_mentions = [
$parent['author-link']
];
if ($parent['alias']) {
$implicit_mentions[] = $parent['alias'];
}
foreach ($parent_terms as $term) {
$contact = Contact::getDetailsByURL($term['url'], 0);
if (!empty($contact)) {
$implicit_mentions[] = $contact['url'];
$implicit_mentions[] = $contact['nurl'];
$implicit_mentions[] = $contact['alias'];
}
}
return $implicit_mentions;
}
/**
* Strips from the body prepended implicit mentions
*
* @param string $body
* @param array $implicit_mentions List of profile URLs
* @return string
*/
private static function removeImplicitMentionsFromBody($body, array $implicit_mentions)
{
if (Config::get('system', 'disable_mentions_removal')) {
return $body;
}
$kept_mentions = [];
// Extract one prepended mention at a time from the body
while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#mis', $body, $matches)) {
if (!in_array($matches[2], $implicit_mentions) ) {
$kept_mentions[] = $matches[1];
}
$body = $matches[3];
}
// Re-appending the kept mentions to the body after extraction
$kept_mentions[] = $body;
return implode('', $kept_mentions);
}
}