<?php
/**
* @copyright Copyright (C) 2010-2022, the Friendica project
*
* @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\Content\Text\HTML;
use Friendica\Content\Text\Markdown;
use Friendica\Core\Cache\Enum\Duration;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\System;
use Friendica\Core\Worker;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\APContact;
use Friendica\Model\Contact;
use Friendica\Model\Conversation;
use Friendica\Model\Event;
use Friendica\Model\GServer;
use Friendica\Model\Item;
use Friendica\Model\ItemURI;
use Friendica\Model\Mail;
use Friendica\Model\Tag;
use Friendica\Model\User;
use Friendica\Model\Post;
use Friendica\Protocol\Activity;
use Friendica\Protocol\ActivityPub;
use Friendica\Protocol\Relay;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\HTTPSignature;
use Friendica\Util\JsonLD;
use Friendica\Util\Network;
use Friendica\Util\Strings;
use Friendica\Worker\Delivery;
/**
* ActivityPub Processor Protocol class
*/
class Processor
{
const CACHEKEY_FETCH_ACTIVITY = 'processor:fetchMissingActivity:';
const CACHEKEY_JUST_FETCHED = 'processor:isJustFetched:';
/**
* Add an object id to the list of processed ids
*
* @param string $id
*
* @return void
*/
private static function addActivityId(string $id)
{
DBA::delete('fetched-activity', ["`received` < ?", DateTimeFormat::utc('now - 5 minutes')]);
DBA::insert('fetched-activity', ['object-id' => $id, 'received' => DateTimeFormat::utcNow()]);
}
/**
* Checks if the given object id has just been fetched
*
* @param string $id
*
* @return boolean
*/
private static function isFetched(string $id): bool
{
return DBA::exists('fetched-activity', ['object-id' => $id]);
}
/**
* Extracts the tag character (#, @, !) from mention links
*
* @param string $body
* @return string
*/
public static function normalizeMentionLinks(string $body): string
{
return preg_replace('%\[url=([^\[\]]*)]([#@!])(.*?)\[/url]%ism', '$2[url=$1]$3[/url]', $body);
}
/**
* Convert the language array into a language JSON
*
* @param array $languages
* @return string language JSON
*/
private static function processLanguages(array $languages): string
{
$codes = array_keys($languages);
$lang = [];
foreach ($codes as $code) {
$lang[$code] = 1;
}
if (empty($lang)) {
return '';
}
return json_encode($lang);
}
/**
* Replaces emojis in the body
*
* @param int $uri_id
* @param string $body
* @param array $emojis
*
* @return string with replaced emojis
*/
private static function replaceEmojis(int $uri_id, string $body, array $emojis): string
{
$body = strtr($body,
array_combine(
array_column($emojis, 'name'),
array_map(function ($emoji) {
return '[emoji=' . $emoji['href'] . ']' . $emoji['name'] . '[/emoji]';
}, $emojis)
)
);
// We store the emoji here to be able to avoid storing it in the media
foreach ($emojis as $emoji) {
Post\Link::getByLink($uri_id, $emoji['href']);
}
return $body;
}
/**
* Store attached media files in the post-media table
*
* @param int $uriid
* @param array $attachment
* @return void
*/
private static function storeAttachmentAsMedia(int $uriid, array $attachment)
{
if (empty($attachment['url'])) {
return;
}
$data = ['uri-id' => $uriid];
$data['type'] = Post\Media::UNKNOWN;
$data['url'] = $attachment['url'];
$data['mimetype'] = $attachment['mediaType'] ?? null;
$data['height'] = $attachment['height'] ?? null;
$data['width'] = $attachment['width'] ?? null;
$data['size'] = $attachment['size'] ?? null;
$data['preview'] = $attachment['image'] ?? null;
$data['description'] = $attachment['name'] ?? null;
Post\Media::insert($data);
}
/**
* Store attachment data
*
* @param array $activity
* @param array $item
*/
private static function storeAttachments(array $activity, array $item)
{
if (empty($activity['attachments'])) {
return;
}
foreach ($activity['attachments'] as $attach) {
self::storeAttachmentAsMedia($item['uri-id'], $attach);
}
}
/**
* Store question data
*
* @param array $activity
* @param array $item
*/
private static function storeQuestion(array $activity, array $item)
{
if (empty($activity['question'])) {
return;
}
$question = ['multiple' => $activity['question']['multiple']];
if (!empty($activity['question']['voters'])) {
$question['voters'] = $activity['question']['voters'];
}
if (!empty($activity['question']['end-time'])) {
$question['end-time'] = DateTimeFormat::utc($activity['question']['end-time']);
}
Post\Question::update($item['uri-id'], $question);
foreach ($activity['question']['options'] as $key => $option) {
$option = ['name' => $option['name'], 'replies' => $option['replies']];
Post\QuestionOption::update($item['uri-id'], $key, $option);
}
Logger::debug('Storing incoming question', ['type' => $activity['type'], 'uri-id' => $item['uri-id'], 'question' => $activity['question']]);
}
/**
* Updates a message
*
* @param array $activity Activity array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function updateItem(array $activity)
{
$item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity', 'post-type', 'private'], ['uri' => $activity['id']]);
if (!DBA::isResult($item)) {
Logger::notice('No existing item, item will be created', ['uri' => $activity['id']]);
$item = self::createItem($activity, false);
if (empty($item)) {
Queue::remove($activity);
return;
}
self::postItem($activity, $item);
return;
}
$item['changed'] = DateTimeFormat::utcNow();
$item['edited'] = DateTimeFormat::utc($activity['updated']);
$item = self::processContent($activity, $item);
if (empty($item)) {
Queue::remove($activity);
return;
}
self::storeAttachments($activity, $item);
self::storeQuestion($activity, $item);
Post\History::add($item['uri-id'], $item);
Item::update($item, ['uri' => $activity['id']]);
Queue::remove($activity);
if ($activity['object_type'] == 'as:Event') {
$posts = Post::select(['event-id', 'uid'], ["`uri` = ? AND `event-id` > ?", $activity['id'], 0]);
while ($post = DBA::fetch($posts)) {
self::updateEvent($post['event-id'], $activity);
}
}
}
/**
* Update an existing event
*
* @param int $event_id
* @param array $activity
*/
private static function updateEvent(int $event_id, array $activity)
{
$event = DBA::selectFirst('event', [], ['id' => $event_id]);
$event['edited'] = DateTimeFormat::utc($activity['updated']);
$event['summary'] = HTML::toBBCode($activity['name']);
$event['desc'] = HTML::toBBCode($activity['content']);
if (!empty($activity['start-time'])) {
$event['start'] = DateTimeFormat::utc($activity['start-time']);
}
if (!empty($activity['end-time'])) {
$event['finish'] = DateTimeFormat::utc($activity['end-time']);
}
$event['nofinish'] = empty($event['finish']);
$event['location'] = $activity['location'];
Logger::info('Updating event', ['uri' => $activity['id'], 'id' => $event_id]);
Event::store($event);
}
/**
* Prepares data for a message
*
* @param array $activity Activity array
* @param bool $fetch_parents
*
* @return array Internal item
*
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function createItem(array $activity, bool $fetch_parents): array
{
$item = [];
$item['verb'] = Activity::POST;
$item['thr-parent'] = $activity['reply-to-id'];
if ($activity['reply-to-id'] == $activity['id']) {
$item['gravity'] = Item::GRAVITY_PARENT;
$item['object-type'] = Activity\ObjectType::NOTE;
} else {
$item['gravity'] = Item::GRAVITY_COMMENT;
$item['object-type'] = Activity\ObjectType::COMMENT;
}
if (!empty($activity['conversation'])) {
$item['conversation'] = $activity['conversation'];
} elseif (!empty($activity['context'])) {
$item['conversation'] = $activity['context'];
}
if (!empty($item['conversation'])) {
$conversation = Post::selectFirstThread(['uri'], ['conversation' => $item['conversation']]);
if (!empty($conversation)) {
Logger::debug('Got conversation', ['conversation' => $item['conversation'], 'parent' => $conversation]);
$item['parent-uri'] = $conversation['uri'];
$item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
}
} else {
$conversation = [];
}
Logger::debug('Create Item', ['id' => $activity['id'], 'conversation' => $item['conversation'] ?? '']);
if (empty($activity['author']) && empty($activity['actor'])) {
Logger::notice('Missing author and actor. We quit here.', ['activity' => $activity]);
Queue::remove($activity);
return [];
}
if (!in_array(0, $activity['receiver']) || !DI::config()->get('system', 'fetch_parents')) {
$fetch_parents = false;
}
if ($fetch_parents && empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
$result = self::fetchParent($activity, !empty($conversation));
if (!empty($result)) {
if (($item['thr-parent'] != $result) && Post::exists(['uri' => $result])) {
$item['thr-parent'] = $result;
}
} elseif (empty($conversation)) {
return [];
}
}
$item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
if (empty($conversation) && empty($activity['directmessage']) && ($item['gravity'] != Item::GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
Logger::notice('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
if (!$fetch_parents) {
Queue::remove($activity);
}
return [];
}
$item['network'] = Protocol::ACTIVITYPUB;
$item['author-link'] = $activity['author'];
$item['author-id'] = Contact::getIdForURL($activity['author']);
$item['owner-link'] = $activity['actor'];
$item['owner-id'] = Contact::getIdForURL($activity['actor']);
if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
$item['private'] = Item::UNLISTED;
} elseif (in_array(0, $activity['receiver'])) {
$item['private'] = Item::PUBLIC;
} else {
$item['private'] = Item::PRIVATE;
}
if (!empty($activity['raw'])) {
$item['source'] = $activity['raw'];
}
$item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
if (isset($activity['push'])) {
$item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
}
if (!empty($activity['from-relay'])) {
$item['direction'] = Conversation::RELAY;
}
if ($activity['object_type'] == 'as:Article') {
$item['post-type'] = Item::PT_ARTICLE;
} elseif ($activity['object_type'] == 'as:Audio') {
$item['post-type'] = Item::PT_AUDIO;
} elseif ($activity['object_type'] == 'as:Document') {
$item['post-type'] = Item::PT_DOCUMENT;
} elseif ($activity['object_type'] == 'as:Event') {
$item['post-type'] = Item::PT_EVENT;
} elseif ($activity['object_type'] == 'as:Image') {
$item['post-type'] = Item::PT_IMAGE;
} elseif ($activity['object_type'] == 'as:Page') {
$item['post-type'] = Item::PT_PAGE;
} elseif ($activity['object_type'] == 'as:Question') {
$item['post-type'] = Item::PT_POLL;
} elseif ($activity['object_type'] == 'as:Video') {
$item['post-type'] = Item::PT_VIDEO;
} else {
$item['post-type'] = Item::PT_NOTE;
}
$item['isForum'] = false;
if (!empty($activity['thread-completion'])) {
if ($activity['thread-completion'] != $item['owner-id']) {
$actor = Contact::getById($activity['thread-completion'], ['url']);
$item['causer-link'] = $actor['url'];
$item['causer-id'] = $activity['thread-completion'];
Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
} else {
// Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
$item['causer-link'] = $item['owner-link'];
$item['causer-id'] = $item['owner-id'];
Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
}
$item['owner-link'] = $item['author-link'];
$item['owner-id'] = $item['author-id'];
} else {
$actor = APContact::getByURL($item['owner-link'], false);
$item['isForum'] = ($actor['type'] ?? 'Person') == 'Group';
}
$item['uri'] = $activity['id'];
if (empty($activity['published']) || empty($activity['updated'])) {
DI::logger()->notice('published or updated keys are empty for activity', ['activity' => $activity, 'callstack' => System::callstack(10)]);
}
$item['created'] = DateTimeFormat::utc($activity['published'] ?? 'now');
$item['edited'] = DateTimeFormat::utc($activity['updated'] ?? 'now');
$guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
$item['guid'] = $activity['diaspora:guid'] ?: $guid;
$item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
if (empty($item['uri-id'])) {
Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
return [];
}
$item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
$item = self::processContent($activity, $item);
if (empty($item)) {
Logger::info('Message was not processed');
Queue::remove($activity);
return [];
}
$item['plink'] = $activity['alternate-url'] ?? $item['uri'];
self::storeAttachments($activity, $item);
self::storeQuestion($activity, $item);
// We received the post via AP, so we set the protocol of the server to AP
$contact = Contact::getById($item['author-id'], ['gsid']);
if (!empty($contact['gsid'])) {
GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
}
if ($item['author-id'] != $item['owner-id']) {
$contact = Contact::getById($item['owner-id'], ['gsid']);
if (!empty($contact['gsid'])) {
GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
}
}
return $item;
}
/**
* Fetch and process parent posts for the given activity
*
* @param array $activity
* @param bool $in_background
*
* @return string
*/
private static function fetchParent(array $activity, bool $in_background = false): string
{
if (self::isFetched($activity['reply-to-id'])) {
Logger::info('Id is already fetched', ['id' => $activity['reply-to-id']]);
return '';
}
self::addActivityId($activity['reply-to-id']);
if (!DI::config()->get('system', 'fetch_by_worker')) {
$in_background = false;
}
$recursion_depth = $activity['recursion-depth'] ?? 0;
if (!$in_background && ($recursion_depth < DI::config()->get('system', 'max_recursion_depth'))) {
Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
$result = self::fetchMissingActivity($activity['reply-to-id'], $activity, '', Receiver::COMPLETION_AUTO);
if (empty($result) && self::isActivityGone($activity['reply-to-id'])) {
Logger::notice('The activity is gone, the queue entry will be deleted', ['parent' => $activity['reply-to-id']]);
if (!empty($activity['entry-id'])) {
Queue::deleteById($activity['entry-id']);
}
return '';
} elseif (!empty($result)) {
$exists = Post::exists(['uri' => [$result, $activity['reply-to-id']]]);
if ($exists) {
Logger::notice('The activity has been fetched and created.', ['parent' => $result]);
return $result;
} elseif (DI::config()->get('system', 'fetch_by_worker') || DI::config()->get('system', 'decoupled_receiver')) {
Logger::notice('The activity has been fetched and will hopefully be created later.', ['parent' => $result]);
} else {
Logger::notice('The activity exists but has not been created, the queue entry will be deleted.', ['parent' => $result]);
if (!empty($activity['entry-id'])) {
Queue::deleteById($activity['entry-id']);
}
}
return '';
}
if (empty($result) && !DI::config()->get('system', 'fetch_by_worker')) {
return '';
}
} elseif (self::isActivityGone($activity['reply-to-id'])) {
Logger::notice('The activity is gone. We will not spawn a worker. The queue entry will be deleted', ['parent' => $activity['reply-to-id']]);
if ($in_background) {
// fetching in background is done for all activities where we have got the conversation
// There we only delete the single activity and not the whole thread since we can store the
// other posts in the thread even with missing posts.
Queue::remove($activity);
} elseif (!empty($activity['entry-id'])) {
Queue::deleteById($activity['entry-id']);
}
return '';
} elseif ($in_background) {
Logger::notice('Fetching is done in the background.', ['parent' => $activity['reply-to-id']]);
} else {
Logger::notice('Recursion level is too high.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
}
if (!Fetch::hasWorker($activity['reply-to-id'])) {
Logger::notice('Fetching is done by worker.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
Fetch::add($activity['reply-to-id']);
$activity['recursion-depth'] = 0;
$wid = Worker::add(Worker::PRIORITY_HIGH, 'FetchMissingActivity', $activity['reply-to-id'], $activity, '', Receiver::COMPLETION_AUTO);
Fetch::setWorkerId($activity['reply-to-id'], $wid);
} else {
Logger::debug('Activity will already be fetched via a worker.', ['url' => $activity['reply-to-id']]);
}
return '';
}
/**
* Check if a given activity is no longer available
*
* @param string $url
*
* @return boolean
*/
public static function isActivityGone(string $url): bool
{
$curlResult = HTTPSignature::fetchRaw($url, 0);
if (Network::isUrlBlocked($url)) {
return true;
}
// @todo To ensure that the remote system is working correctly, we can check if the "Content-Type" contains JSON
if (in_array($curlResult->getReturnCode(), [401, 404])) {
return true;
}
if ($curlResult->isSuccess()) {
$object = json_decode($curlResult->getBody(), true);
if (!empty($object)) {
$activity = JsonLD::compact($object);
if (JsonLD::fetchElement($activity, '@type') == 'as:Tombstone') {
return true;
}
}
} elseif ($curlResult->getReturnCode() == 0) {
$host = parse_url($url, PHP_URL_HOST);
if (!(filter_var($host, FILTER_VALIDATE_IP) || @dns_get_record($host . '.', DNS_A + DNS_AAAA))) {
return true;
}
}
return false;
}
/**
* Delete items
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function deleteItem(array $activity)
{
$owner = Contact::getIdForURL($activity['actor']);
Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
Queue::remove($activity);
}
/**
* Prepare the item array for an activity
*
* @param array $activity Activity array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function addTag(array $activity)
{
if (empty($activity['object_content']) || empty($activity['object_id'])) {
return;
}
foreach ($activity['receiver'] as $receiver) {
$item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
if (!DBA::isResult($item)) {
// We don't fetch missing content for this purpose
continue;
}
if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
continue;
}
Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
}
}
/**
* 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(array $activity, string $verb)
{
$activity['reply-to-id'] = $activity['object_id'];
$item = self::createItem($activity, false);
if (empty($item)) {
Logger::debug('Activity was not prepared', ['id' => $activity['object_id']]);
return;
}
$item['verb'] = $verb;
$item['thr-parent'] = $activity['object_id'];
$item['gravity'] = Item::GRAVITY_ACTIVITY;
unset($item['post-type']);
$item['object-type'] = Activity\ObjectType::NOTE;
if (!empty($activity['content'])) {
$item['body'] = HTML::toBBCode($activity['content']);
}
$item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
self::postItem($activity, $item);
}
/**
* Fetch the Uri-Id of a post for the "featured" collection
*
* @param array $activity
* @return null|array
*/
private static function getUriIdForFeaturedCollection(array $activity)
{
$actor = APContact::getByURL($activity['actor']);
if (empty($actor)) {
return null;
}
// Refetch the account when the "featured" collection is missing.
// This can be removed in a future version (end of 2022 should be good).
if (empty($actor['featured'])) {
$actor = APContact::getByURL($activity['actor'], true);
if (empty($actor)) {
return null;
}
}
$parent = Post::selectFirst(['uri-id', 'author-id'], ['uri' => $activity['object_id']]);
if (empty($parent['uri-id'])) {
if (self::fetchMissingActivity($activity['object_id'], $activity, '', Receiver::COMPLETION_AUTO)) {
$parent = Post::selectFirst(['uri-id'], ['uri' => $activity['object_id']]);
}
}
if (!empty($parent['uri-id'])) {
$parent;
}
return null;
}
/**
* Add a post to the "Featured" collection
*
* @param array $activity
*/
public static function addToFeaturedCollection(array $activity)
{
$post = self::getUriIdForFeaturedCollection($activity);
if (empty($post)) {
return;
}
Logger::debug('Add post to featured collection', ['post' => $post]);
Post\Collection::add($post['uri-id'], Post\Collection::FEATURED, $post['author-id']);
Queue::remove($activity);
}
/**
* Remove a post to the "Featured" collection
*
* @param array $activity
*/
public static function removeFromFeaturedCollection(array $activity)
{
$post = self::getUriIdForFeaturedCollection($activity);
if (empty($post)) {
return;
}
Logger::debug('Remove post from featured collection', ['post' => $post]);
Post\Collection::remove($post['uri-id'], Post\Collection::FEATURED);
Queue::remove($activity);
}
/**
* Create an event
*
* @param array $activity Activity array
* @param array $item
*
* @return int event id
* @throws \Exception
*/
public static function createEvent(array $activity, array $item): int
{
$event['summary'] = HTML::toBBCode($activity['name'] ?: $activity['summary']);
$event['desc'] = HTML::toBBCode($activity['content'] ?? '');
if (!empty($activity['start-time'])) {
$event['start'] = DateTimeFormat::utc($activity['start-time']);
}
if (!empty($activity['end-time'])) {
$event['finish'] = DateTimeFormat::utc($activity['end-time']);
}
$event['nofinish'] = empty($event['finish']);
$event['location'] = $activity['location'];
$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'];
$event['network'] = $item['network'];
$event['protocol'] = $item['protocol'];
$event['direction'] = $item['direction'];
$event['source'] = $item['source'];
$ev = DBA::selectFirst('event', ['id'], ['uri' => $item['uri'], 'uid' => $item['uid']]);
if (DBA::isResult($ev)) {
$event['id'] = $ev['id'];
}
$event_id = Event::store($event);
Logger::info('Event was stored', ['id' => $event_id]);
return $event_id;
}
/**
* Process the content
*
* @param array $activity Activity array
* @param array $item
* @return array|bool Returns the item array or false if there was an unexpected occurrence
* @throws \Exception
*/
private static function processContent(array $activity, array $item)
{
if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
$item['title'] = strip_tags($activity['name'] ?? '');
$content = Markdown::toBBCode($activity['content']);
} elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
$item['title'] = $activity['name'];
$content = $activity['content'];
} else {
// By default assume "text/html"
$item['title'] = HTML::toBBCode($activity['name'] ?? '');
$content = HTML::toBBCode($activity['content'] ?? '');
}
$item['title'] = trim(BBCode::toPlaintext($item['title']));
if (!empty($activity['languages'])) {
$item['language'] = self::processLanguages($activity['languages']);
}
if (!empty($activity['emojis'])) {
$content = self::replaceEmojis($item['uri-id'], $content, $activity['emojis']);
}
$content = self::addMentionLinks($content, $activity['tags']);
if (!empty($activity['quote-url'])) {
$id = Item::fetchByLink($activity['quote-url']);
if ($id) {
$shared_item = Post::selectFirst(['uri-id'], ['id' => $id]);
$item['quote-uri-id'] = $shared_item['uri-id'];
} else {
Logger::info('Quote was not fetched', ['guid' => $item['guid'], 'uri-id' => $item['uri-id'], 'quote' => $activity['quote-url']]);
}
}
if (!empty($activity['source'])) {
$item['body'] = $activity['source'];
$item['raw-body'] = $content;
$quote_uri_id = Item::getQuoteUriId($item['body']);
if (empty($item['quote-uri-id']) && !empty($quote_uri_id)) {
$item['quote-uri-id'] = $quote_uri_id;
}
$item['body'] = BBCode::removeSharedData($item['body']);
} else {
$parent_uri = $item['parent-uri'] ?? $item['thr-parent'];
if (empty($activity['directmessage']) && ($parent_uri != $item['uri']) && ($item['gravity'] == Item::GRAVITY_COMMENT)) {
$parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $parent_uri]);
if (!DBA::isResult($parent)) {
Logger::warning('Unknown parent item.', ['uri' => $parent_uri]);
return false;
}
if (!empty($activity['type']) && in_array($activity['type'], Receiver::CONTENT_TYPES) && ($item['private'] == Item::PRIVATE) && ($parent['private'] != Item::PRIVATE)) {
Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
return false;
}
$content = self::removeImplicitMentionsFromBody($content, $parent);
}
$item['content-warning'] = HTML::toBBCode($activity['summary'] ?? '');
$item['raw-body'] = $item['body'] = $content;
}
self::storeFromBody($item);
self::storeTags($item['uri-id'], $activity['tags']);
self::storeReceivers($item['uri-id'], $activity['receiver_urls'] ?? []);
$item['location'] = $activity['location'];
if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
$item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
}
$item['app'] = $activity['generator'];
return $item;
}
/**
* Store hashtags and mentions
*
* @param array $item
*/
private static function storeFromBody(array $item)
{
// Make sure to delete all existing tags (can happen when called via the update functionality)
DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
}
/**
* Generate a GUID out of an URL of an ActivityPub post.
*
* @param string $url message URL
* @return string with GUID
*/
private static function getGUIDByURL(string $url): string
{
$parsed = parse_url($url);
$host_hash = hash('crc32', $parsed['host']);
unset($parsed["scheme"]);
unset($parsed["host"]);
$path = implode("/", $parsed);
return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
}
/**
* Checks if an incoming message is wanted
*
* @param array $activity
* @param array $item
* @return boolean Is the message wanted?
*/
private static function isSolicitedMessage(array $activity, array $item): bool
{
// The checks are split to improve the support when searching why a message was accepted.
if (count($activity['receiver']) != 1) {
// The message has more than one receiver, so it is wanted.
Logger::debug('Message has got several receivers - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
return true;
}
if ($item['private'] == Item::PRIVATE) {
// We only look at public posts here. Private posts are expected to be intentionally posted to the single receiver.
Logger::debug('Message is private - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
return true;
}
if (!empty($activity['from-relay'])) {
// We check relay posts at another place. When it arrived here, the message is already checked.
Logger::debug('Message is a relay post that is already checked - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
return true;
}
if (in_array($activity['completion-mode'] ?? Receiver::COMPLETION_NONE, [Receiver::COMPLETION_MANUAL, Receiver::COMPLETION_ANNOUCE])) {
// Manual completions and completions caused by reshares are allowed without any further checks.
Logger::debug('Message is in completion mode - accepted', ['mode' => $activity['completion-mode'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
return true;
}
if ($item['gravity'] != Item::GRAVITY_PARENT) {
// We cannot reliably check at this point if a comment or activity belongs to an accepted post or needs to be fetched
// This can possibly be improved in the future.
Logger::debug('Message is no parent - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
return true;
}
$tags = array_column(Tag::getByURIId($item['uri-id'], [Tag::HASHTAG]), 'name');
if (Relay::isSolicitedPost($tags, $item['body'], $item['author-id'], $item['uri'], Protocol::ACTIVITYPUB, $activity['thread-completion'] ?? 0)) {
Logger::debug('Post is accepted because of the relay settings', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
return true;
} else {
return false;
}
}
/**
* Creates an item post
*
* @param array $activity Activity data
* @param array $item item array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function postItem(array $activity, array $item)
{
if (empty($item)) {
return;
}
$stored = false;
$success = false;
ksort($activity['receiver']);
if (!self::isSolicitedMessage($activity, $item)) {
DBA::delete('item-uri', ['id' => $item['uri-id']]);
if (!empty($activity['entry-id'])) {
Queue::deleteById($activity['entry-id']);
}
return;
}
foreach ($activity['receiver'] as $receiver) {
if ($receiver == -1) {
continue;
}
if (($receiver != 0) && empty($item['parent-uri-id']) && !empty($item['thr-parent-id'])) {
$parent = Post::selectFirst(['parent-uri-id', 'parent-uri'], ['uri-id' => $item['thr-parent-id'], 'uid' => [0, $receiver]]);
if (!empty($parent['parent-uri-id'])) {
$item['parent-uri-id'] = $parent['parent-uri-id'];
$item['parent-uri'] = $parent['parent-uri'];
}
}
$item['uid'] = $receiver;
$type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
switch($type) {
case Receiver::TARGET_TO:
$item['post-reason'] = Item::PR_TO;
break;
case Receiver::TARGET_CC:
$item['post-reason'] = Item::PR_CC;
break;
case Receiver::TARGET_BTO:
$item['post-reason'] = Item::PR_BTO;
break;
case Receiver::TARGET_BCC:
$item['post-reason'] = Item::PR_BCC;
break;
case Receiver::TARGET_FOLLOWER:
$item['post-reason'] = Item::PR_FOLLOWER;
break;
case Receiver::TARGET_ANSWER:
$item['post-reason'] = Item::PR_COMMENT;
break;
case Receiver::TARGET_GLOBAL:
$item['post-reason'] = Item::PR_GLOBAL;
break;
default:
$item['post-reason'] = Item::PR_NONE;
}
$item['post-reason'] = Item::getPostReason($item);
if (in_array($item['post-reason'], [Item::PR_GLOBAL, Item::PR_NONE])) {
if (!empty($activity['from-relay'])) {
$item['post-reason'] = Item::PR_RELAY;
} elseif (!empty($activity['thread-completion'])) {
$item['post-reason'] = Item::PR_FETCHED;
} elseif (!empty($activity['push'])) {
$item['post-reason'] = Item::PR_PUSHED;
}
} elseif (($item['post-reason'] == Item::PR_FOLLOWER) && !empty($activity['from-relay'])) {
// When a post arrives via a relay and we follow the author, we have to override the causer.
// Otherwise the system assumes that we follow the relay. (See "addRowInformation")
Logger::debug('Relay post for follower', ['receiver' => $receiver, 'guid' => $item['guid'], 'relay' => $activity['from-relay']]);
$item['causer-id'] = ($item['gravity'] == Item::GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
}
if ($item['isForum'] ?? false) {
$item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
} else {
$item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
}
if (($receiver != 0) && empty($item['contact-id'])) {
$item['contact-id'] = Contact::getIdForURL($activity['author']);
}
if (!empty($activity['directmessage'])) {
self::postMail($activity, $item);
continue;
}
if (($receiver != 0) && ($item['gravity'] == Item::GRAVITY_PARENT) && !in_array($item['post-reason'], [Item::PR_FOLLOWER, Item::PR_TAG, item::PR_TO, Item::PR_CC])) {
if (!($item['isForum'] ?? false)) {
if ($item['post-reason'] == Item::PR_BCC) {
Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id'], 'url' => $item['uri']]);
continue;
}
if ((DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') != Item::COMPLETION_LIKE)
&& in_array($activity['thread-children-type'] ?? '', Receiver::ACTIVITY_TYPES)) {
Logger::info('Top level post from thread completion from a non sharer had been initiated via an activity, ignoring',
['type' => $activity['thread-children-type'], 'user' => $item['uid'], 'causer' => $item['causer-link'], 'author' => $activity['author'], 'url' => $item['uri']]);
continue;
}
}
$is_forum = false;
$user = User::getById($receiver, ['account-type']);
if (!empty($user['account-type'])) {
$is_forum = ($user['account-type'] == User::ACCOUNT_TYPE_COMMUNITY);
}
if ((DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') == Item::COMPLETION_NONE)
&& ((!$is_forum && !($item['isForum'] ?? false) && ($activity['type'] != 'as:Announce'))
|| !Contact::isSharingByURL($activity['actor'], $receiver))) {
Logger::info('Actor is a non sharer, is no forum or it is no announce', ['uid' => $receiver, 'actor' => $activity['actor'], 'url' => $item['uri'], 'type' => $activity['type']]);
continue;
}
Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
}
if (!self::hasParents($item, $receiver)) {
continue;
}
if (($item['gravity'] != Item::GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
$event_id = self::createEvent($activity, $item);
$item = Event::getItemArrayForImportedId($event_id, $item);
}
$item_id = Item::insert($item);
if ($item_id) {
Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
$success = true;
} else {
Logger::notice('Item insertion aborted', ['uri' => $item['uri'], 'uid' => $item['uid']]);
if (($item['uid'] == 0) && (count($activity['receiver']) > 1)) {
Logger::info('Public item was aborted. We skip for all users.', ['uri' => $item['uri']]);
break;
}
}
if ($item['uid'] == 0) {
$stored = $item_id;
}
}
Queue::remove($activity);
if ($success && Queue::hasChildren($item['uri']) && Post::exists(['uri' => $item['uri']])) {
Queue::processReplyByUri($item['uri']);
}
// Store send a follow request for every reshare - but only when the item had been stored
if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == Item::GRAVITY_PARENT) && !empty($item['author-link']) && ($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::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
}
}
}
/**
* Checks if there are parent posts for the given receiver.
* If not, then the system will try to add them.
*
* @param array $item
* @param integer $receiver
* @return boolean
*/
private static function hasParents(array $item, int $receiver)
{
if (($receiver == 0) || ($item['gravity'] == Item::GRAVITY_PARENT)) {
return true;
}
$fields = ['causer-id' => $item['causer-id'] ?? $item['author-id'], 'post-reason' => Item::PR_FETCHED];
$add_parent = true;
if ($item['verb'] != Activity::ANNOUNCE) {
switch (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer')) {
case Item::COMPLETION_COMMENT:
$add_parent = ($item['gravity'] != Item::GRAVITY_ACTIVITY);
break;
case Item::COMPLETION_NONE:
$add_parent = false;
break;
}
}
if ($add_parent) {
$add_parent = Contact::isSharing($fields['causer-id'], $receiver);
if (!$add_parent && ($item['author-id'] != $fields['causer-id'])) {
$add_parent = Contact::isSharing($item['author-id'], $receiver);
}
if (!$add_parent && !in_array($item['owner-id'], [$fields['causer-id'], $item['author-id']])) {
$add_parent = Contact::isSharing($item['owner-id'], $receiver);
}
}
$has_parents = false;
if (!empty($item['parent-uri-id'])) {
if (Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $receiver])) {
$has_parents = true;
} elseif ($add_parent && Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => 0])) {
$stored = Item::storeForUserByUriId($item['parent-uri-id'], $receiver, $fields);
$has_parents = (bool)$stored;
if ($stored) {
Logger::notice('Inserted missing parent post', ['stored' => $stored, 'uid' => $receiver, 'parent' => $item['parent-uri']]);
} else {
Logger::notice('Parent could not be added.', ['uid' => $receiver, 'uri' => $item['uri'], 'parent' => $item['parent-uri']]);
return false;
}
} elseif ($add_parent) {
Logger::debug('Parent does not exist.', ['uid' => $receiver, 'uri' => $item['uri'], 'parent' => $item['parent-uri']]);
} else {
Logger::debug('Parent should not be added.', ['uid' => $receiver, 'gravity' => $item['gravity'], 'verb' => $item['verb'], 'guid' => $item['guid'], 'uri' => $item['uri'], 'parent' => $item['parent-uri']]);
}
}
if (empty($item['parent-uri-id']) || ($item['thr-parent-id'] != $item['parent-uri-id'])) {
if (Post::exists(['uri-id' => $item['thr-parent-id'], 'uid' => $receiver])) {
$has_parents = true;
} elseif (($has_parents || $add_parent) && Post::exists(['uri-id' => $item['thr-parent-id'], 'uid' => 0])) {
$stored = Item::storeForUserByUriId($item['thr-parent-id'], $receiver, $fields);
$has_parents = $has_parents || (bool)$stored;
if ($stored) {
Logger::notice('Inserted missing thread parent post', ['stored' => $stored, 'uid' => $receiver, 'thread-parent' => $item['thr-parent']]);
} else {
Logger::notice('Thread parent could not be added.', ['uid' => $receiver, 'uri' => $item['uri'], 'thread-parent' => $item['thr-parent']]);
}
} elseif ($add_parent) {
Logger::debug('Thread parent does not exist.', ['uid' => $receiver, 'uri' => $item['uri'], 'thread-parent' => $item['thr-parent']]);
} else {
Logger::debug('Thread parent should not be added.', ['uid' => $receiver, 'gravity' => $item['gravity'], 'verb' => $item['verb'], 'guid' => $item['guid'], 'uri' => $item['uri'], 'thread-parent' => $item['thr-parent']]);
}
}
return $has_parents;
}
/**
* Store tags and mentions into the tag table
*
* @param integer $uriid
* @param array $tags
*/
private static function storeTags(int $uriid, array $tags = null)
{
foreach ($tags as $tag) {
if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
continue;
}
$hash = substr($tag['name'], 0, 1);
if ($tag['type'] == 'Mention') {
if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
$tag['name'] = substr($tag['name'], 1);
}
$type = Tag::IMPLICIT_MENTION;
if (!empty($tag['href'])) {
$apcontact = APContact::getByURL($tag['href']);
if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
$tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
}
}
} elseif ($tag['type'] == 'Hashtag') {
if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
$tag['name'] = substr($tag['name'], 1);
}
$type = Tag::HASHTAG;
}
if (empty($tag['name'])) {
continue;
}
Tag::store($uriid, $type, $tag['name'], $tag['href']);
}
}
public static function storeReceivers(int $uriid, array $receivers)
{
foreach (['as:to' => Tag::TO, 'as:cc' => Tag::CC, 'as:bto' => Tag::BTO, 'as:bcc' => Tag::BCC] as $element => $type) {
if (!empty($receivers[$element])) {
foreach ($receivers[$element] as $receiver) {
if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
$name = Receiver::PUBLIC_COLLECTION;
} elseif ($path = parse_url($receiver, PHP_URL_PATH)) {
$name = trim($path, '/');
} else {
Logger::warning('Unable to coerce name from receiver', ['receiver' => $receiver]);
$name = '';
}
$target = Tag::getTargetType($receiver);
Logger::debug('Got target type', ['type' => $target, 'url' => $receiver]);
Tag::store($uriid, $type, $name, $receiver, $target);
}
}
}
}
/**
* Creates an mail post
*
* @param array $activity Activity data
* @param array $item item array
* @return int|bool New mail table row id or false on error
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
private static function postMail(array $activity, array $item)
{
if (($item['gravity'] != Item::GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
return false;
}
Logger::info('Direct Message', $item);
$msg = [];
$msg['uid'] = $item['uid'];
$msg['contact-id'] = $item['contact-id'];
$contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
$msg['from-name'] = $contact['name'];
$msg['from-url'] = $contact['url'];
$msg['from-photo'] = $contact['photo'];
$msg['uri'] = $item['uri'];
$msg['created'] = $item['created'];
$parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
if (DBA::isResult($parent)) {
$msg['parent-uri'] = $parent['parent-uri'];
$msg['title'] = $parent['title'];
} else {
$msg['parent-uri'] = $item['thr-parent'];
if (!empty($item['title'])) {
$msg['title'] = $item['title'];
} elseif (!empty($item['content-warning'])) {
$msg['title'] = $item['content-warning'];
} else {
// Trying to generate a title out of the body
$title = $item['body'];
while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
$title = $matches[3];
}
$title = trim(BBCode::toPlaintext($title));
if (strlen($title) > 20) {
$title = substr($title, 0, 20) . '...';
}
$msg['title'] = $title;
}
}
$msg['body'] = $item['body'];
return Mail::insert($msg);
}
/**
* Fetch featured posts from a contact with the given url
*
* @param string $url
* @return void
*/
public static function fetchFeaturedPosts(string $url)
{
Logger::info('Fetch featured posts', ['contact' => $url]);
$apcontact = APContact::getByURL($url);
if (empty($apcontact['featured'])) {
Logger::info('Contact does not have a featured collection', ['contact' => $url]);
return;
}
$pcid = Contact::getIdForURL($url, 0, false);
if (empty($pcid)) {
Logger::notice('Contact not found', ['contact' => $url]);
return;
}
$posts = Post\Collection::selectToArrayForContact($pcid, Post\Collection::FEATURED);
if (!empty($posts)) {
$old_featured = array_column($posts, 'uri-id');
} else {
$old_featured = [];
}
$featured = ActivityPub::fetchItems($apcontact['featured']);
if (empty($featured)) {
Logger::info('Contact does not have featured posts', ['contact' => $url]);
foreach ($old_featured as $uri_id) {
Post\Collection::remove($uri_id, Post\Collection::FEATURED);
Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
}
return;
}
$new = 0;
$old = 0;
foreach ($featured as $post) {
if (empty($post['id'])) {
continue;
}
$id = Item::fetchByLink($post['id']);
if (!empty($id)) {
$item = Post::selectFirst(['uri-id', 'featured', 'author-id'], ['id' => $id]);
if (!empty($item['uri-id'])) {
if (!$item['featured']) {
Post\Collection::add($item['uri-id'], Post\Collection::FEATURED, $item['author-id']);
Logger::debug('Added featured post', ['uri-id' => $item['uri-id'], 'contact' => $url]);
$new++;
} else {
Logger::debug('Post already had been featured', ['uri-id' => $item['uri-id'], 'contact' => $url]);
$old++;
}
$index = array_search($item['uri-id'], $old_featured);
if (!($index === false)) {
unset($old_featured[$index]);
}
}
}
}
foreach ($old_featured as $uri_id) {
Post\Collection::remove($uri_id, Post\Collection::FEATURED);
Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
}
Logger::info('Fetched featured posts', ['new' => $new, 'old' => $old, 'contact' => $url]);
}
public static function fetchCachedActivity(string $url, int $uid): array
{
$cachekey = self::CACHEKEY_FETCH_ACTIVITY . $uid . ':' . hash('sha256', $url);
$object = DI::cache()->get($cachekey);
if (!is_null($object)) {
if (!empty($object)) {
Logger::debug('Fetch from cache', ['url' => $url, 'uid' => $uid]);
} else {
Logger::debug('Fetch from negative cache', ['url' => $url, 'uid' => $uid]);
}
return $object;
}
$object = ActivityPub::fetchContent($url, $uid);
if (empty($object)) {
Logger::notice('Activity was not fetchable, aborting.', ['url' => $url, 'uid' => $uid]);
// We perform negative caching.
DI::cache()->set($cachekey, [], Duration::FIVE_MINUTES);
return [];
}
if (empty($object['id'])) {
Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
return [];
}
DI::cache()->set($cachekey, $object, Duration::FIVE_MINUTES);
Logger::debug('Activity was fetched successfully', ['url' => $url, 'uid' => $uid]);
return $object;
}
/**
* Fetches missing posts
*
* @param string $url message URL
* @param array $child activity array with the child of this message
* @param string $relay_actor Relay actor
* @param int $completion Completion mode, see Receiver::COMPLETION_*
* @return string fetched message URL
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '', int $completion = Receiver::COMPLETION_MANUAL): string
{
$object = self::fetchCachedActivity($url, 0);
if (empty($object)) {
return '';
}
$signer = [];
if (!empty($object['attributedTo'])) {
$attributed_to = $object['attributedTo'];
if (is_array($attributed_to)) {
$compacted = JsonLD::compact($object);
$attributed_to = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
}
$signer[] = $attributed_to;
}
if (!empty($object['actor'])) {
$object_actor = $object['actor'];
} elseif (!empty($attributed_to)) {
$object_actor = $attributed_to;
} else {
// Shouldn't happen
$object_actor = '';
}
$signer[] = $object_actor;
if (!empty($child['author'])) {
$actor = $child['author'];
$signer[] = $actor;
} else {
$actor = $object_actor;
}
if (!empty($object['published'])) {
$published = $object['published'];
} elseif (!empty($child['published'])) {
$published = $child['published'];
} else {
$published = DateTimeFormat::utcNow();
}
$activity = [];
$activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
unset($object['@context']);
$activity['id'] = $object['id'];
$activity['to'] = $object['to'] ?? [];
$activity['cc'] = $object['cc'] ?? [];
$activity['actor'] = $actor;
$activity['object'] = $object;
$activity['published'] = $published;
$activity['type'] = 'Create';
$ldactivity = JsonLD::compact($activity);
$ldactivity['recursion-depth'] = !empty($child['recursion-depth']) ? $child['recursion-depth'] + 1 : 0;
if (!empty($relay_actor)) {
$ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
$ldactivity['completion-mode'] = Receiver::COMPLETION_RELAY;
} elseif (!empty($child['thread-completion'])) {
$ldactivity['thread-completion'] = $child['thread-completion'];
$ldactivity['completion-mode'] = $child['completion-mode'] ?? Receiver::COMPLETION_NONE;
} else {
$ldactivity['thread-completion'] = Contact::getIdForURL($actor);
$ldactivity['completion-mode'] = $completion;
}
if (!empty($child['thread-children-type'])) {
$ldactivity['thread-children-type'] = $child['thread-children-type'];
} elseif (!empty($child['type'])) {
$ldactivity['thread-children-type'] = $child['type'];
} else {
$ldactivity['thread-children-type'] = 'as:Create';
}
if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
return '';
}
if (($completion == Receiver::COMPLETION_RELAY) && Queue::exists($url, 'as:Create')) {
Logger::notice('Activity has already been queued.', ['url' => $url, 'object' => $activity['id']]);
} elseif (ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), 0, true, false, $signer, '', $completion)) {
Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'entry' => $child['entry-id'] ?? 0, 'completion' => $completion, 'object' => $activity['id']]);
} else {
Logger::notice('Activity had been fetched and will be processed later.', ['url' => $url, 'entry' => $child['entry-id'] ?? 0, 'completion' => $completion, 'object' => $activity['id']]);
}
return $activity['id'];
}
/**
* Test if incoming relay messages should be accepted
*
* @param array $activity activity array
* @param string $id object ID
* @return boolean true if message is accepted
*/
private static function acceptIncomingMessage(array $activity, string $id): bool
{
if (empty($activity['as:object'])) {
Logger::info('No object field in activity - accepted', ['id' => $id]);
return true;
}
$replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
$uriid = ItemURI::getIdByURI($replyto ?? '');
if (Post::exists(['uri-id' => $uriid])) {
Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
return true;
}
$attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
$authorid = Contact::getIdForURL($attributed_to);
$body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value') ?? '');
$messageTags = [];
$tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
if (!empty($tags)) {
foreach ($tags as $tag) {
if ($tag['type'] != 'Hashtag') {
continue;
}
$messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
}
}
return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB, $activity['thread-completion'] ?? 0);
}
/**
* perform a "follow" request
*
* @param array $activity
* @return void
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function followUser(array $activity)
{
$uid = User::getIdForURL($activity['object_id']);
if (empty($uid)) {
Queue::remove($activity);
return;
}
$owner = User::getOwnerDataById($uid);
if (empty($owner)) {
return;
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (!empty($cid)) {
self::switchContact($cid);
Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
}
$item = [
'author-id' => Contact::getIdForURL($activity['actor']),
'author-link' => $activity['actor'],
];
// Ensure that the contact has got the right network type
self::switchContact($item['author-id']);
$result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
if ($result === true) {
ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
return;
}
if ($result && DI::config()->get('system', 'transmit_pending_events') && ($owner['contact-type'] == Contact::TYPE_COMMUNITY)) {
self::transmitPendingEvents($cid, $owner['uid']);
}
if (empty($contact)) {
Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
}
Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
Queue::remove($activity);
}
/**
* Transmit pending events to the new follower
*
* @param integer $cid Contact id
* @param integer $uid User id
* @return void
*/
private static function transmitPendingEvents(int $cid, int $uid)
{
$account = DBA::selectFirst('account-user-view', ['ap-inbox', 'ap-sharedinbox'], ['id' => $cid]);
$inbox = $account['ap-sharedinbox'] ?: $account['ap-inbox'];
$events = DBA::select('event', ['id'], ["`uid` = ? AND `start` > ? AND `type` != ?", $uid, DateTimeFormat::utcNow(), 'birthday']);
while ($event = DBA::fetch($events)) {
$post = Post::selectFirst(['id', 'uri-id', 'created'], ['event-id' => $event['id']]);
if (empty($post)) {
continue;
}
if (DI::config()->get('system', 'bulk_delivery')) {
Post\Delivery::add($post['uri-id'], $uid, $inbox, $post['created'], Delivery::POST, [$cid]);
Worker::add(Worker::PRIORITY_HIGH, 'APDelivery', '', 0, $inbox, 0);
} else {
Worker::add(Worker::PRIORITY_HIGH, 'APDelivery', Delivery::POST, $post['id'], $inbox, $uid, [$cid], $post['uri-id']);
}
}
}
/**
* Update the given profile
*
* @param array $activity
* @throws \Exception
*/
public static function updatePerson(array $activity)
{
if (empty($activity['object_id'])) {
return;
}
Logger::info('Updating profile', ['object' => $activity['object_id']]);
Contact::updateFromProbeByURL($activity['object_id']);
Queue::remove($activity);
}
/**
* Delete the given profile
*
* @param array $activity
* @return void
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function deletePerson(array $activity)
{
if (empty($activity['object_id']) || empty($activity['actor'])) {
Logger::info('Empty object id or actor.');
Queue::remove($activity);
return;
}
if ($activity['object_id'] != $activity['actor']) {
Logger::info('Object id does not match actor.');
Queue::remove($activity);
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::info('Deleted contact', ['object' => $activity['object_id']]);
Queue::remove($activity);
}
/**
* Add moved contacts as followers for all subscribers of the old contact
*
* @param array $activity
* @return void
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function movePerson(array $activity)
{
if (empty($activity['target_id']) || empty($activity['object_id'])) {
Queue::remove($activity);
return;
}
if ($activity['object_id'] != $activity['actor']) {
Logger::notice('Object is not the actor', ['activity' => $activity]);
Queue::remove($activity);
return;
}
$from = Contact::getByURL($activity['object_id'], false, ['uri-id']);
if (empty($from['uri-id'])) {
Logger::info('Object not found', ['activity' => $activity]);
Queue::remove($activity);
return;
}
$contacts = DBA::select('contact', ['uid', 'url'], ["`uri-id` = ? AND `uid` != ? AND `rel` IN (?, ?)", $from['uri-id'], 0, Contact::FRIEND, Contact::SHARING]);
while ($from_contact = DBA::fetch($contacts)) {
$result = Contact::createFromProbeForUser($from_contact['uid'], $activity['target_id']);
Logger::debug('Follower added', ['from' => $from_contact, 'result' => $result]);
}
DBA::close($contacts);
Queue::remove($activity);
}
/**
* Blocks the user by the contact
*
* @param array $activity
* @return void
* @throws \Exception
*/
public static function blockAccount(array $activity)
{
$cid = Contact::getIdForURL($activity['actor']);
if (empty($cid)) {
return;
}
$uid = User::getIdForURL($activity['object_id']);
if (empty($uid)) {
return;
}
Contact\User::setIsBlocked($cid, $uid, true);
Logger::info('Contact blocked user', ['contact' => $cid, 'user' => $uid]);
Queue::remove($activity);
}
/**
* Unblocks the user by the contact
*
* @param array $activity
* @return void
* @throws \Exception
*/
public static function unblockAccount(array $activity)
{
$cid = Contact::getIdForURL($activity['actor']);
if (empty($cid)) {
return;
}
$uid = User::getIdForURL($activity['object_object']);
if (empty($uid)) {
return;
}
Contact\User::setIsBlocked($cid, $uid, false);
Logger::info('Contact unblocked user', ['contact' => $cid, 'user' => $uid]);
Queue::remove($activity);
}
/**
* Report a user
*
* @param array $activity
* @return void
* @throws \Exception
*/
public static function ReportAccount(array $activity)
{
$account_id = Contact::getIdForURL($activity['object_id']);
if (empty($account_id)) {
Logger::info('Unknown account', ['activity' => $activity]);
Queue::remove($activity);
return;
}
$reporter_id = Contact::getIdForURL($activity['actor']);
if (empty($reporter_id)) {
Logger::info('Unknown actor', ['activity' => $activity]);
Queue::remove($activity);
return;
}
$status_ids = $activity['object_ids'];
array_shift($status_ids);
$uri_ids = [];
foreach ($status_ids as $status_id) {
$post = Post::selectFirst(['uri-id'], ['uri' => $status_id]);
if (!empty($post['uri-id'])) {
$uri_ids[] = $post['uri-id'];
}
}
$report = DI::reportFactory()->createFromReportsRequest(null, $reporter_id, $account_id, $activity['content'], null, false, $uri_ids);
DI::report()->save($report);
Logger::info('Stored report', ['reporter' => $reporter_id, 'account_id' => $account_id, 'comment' => $activity['content'], 'status_ids' => $status_ids]);
}
/**
* Accept a follow request
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function acceptFollowUser(array $activity)
{
if (!empty($activity['object_actor'])) {
$uid = User::getIdForURL($activity['object_actor']);
$check_id = false;
} elseif (!empty($activity['receiver']) && (count($activity['receiver']) == 1)) {
$uid = array_shift($activity['receiver']);
$check_id = true;
}
if (empty($uid)) {
Logger::notice('User could not be detected', ['activity' => $activity]);
Queue::remove($activity);
return;
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
Logger::notice('No contact found', ['actor' => $activity['actor']]);
Queue::remove($activity);
return;
}
$id = Transmitter::activityIDFromContact($cid);
if ($id == $activity['object_id']) {
Logger::info('Successful id check', ['uid' => $uid, 'cid' => $cid]);
} else {
Logger::info('Unsuccessful id check', ['uid' => $uid, 'cid' => $cid, 'id' => $id, 'object_id' => $activity['object_id']]);
if ($check_id) {
Queue::remove($activity);
return;
}
}
self::switchContact($cid);
$fields = ['pending' => false];
$contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
if ($contact['rel'] == Contact::FOLLOWER) {
$fields['rel'] = Contact::FRIEND;
}
$condition = ['id' => $cid];
Contact::update($fields, $condition);
Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
Queue::remove($activity);
}
/**
* Reject a follow request
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function rejectFollowUser(array $activity)
{
$uid = User::getIdForURL($activity['object_actor']);
if (empty($uid)) {
return;
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
Logger::info('No contact found', ['actor' => $activity['actor']]);
return;
}
self::switchContact($cid);
$contact = Contact::getById($cid, ['rel']);
if ($contact['rel'] == Contact::SHARING) {
Contact::remove($cid);
Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
} elseif ($contact['rel'] == Contact::FRIEND) {
Contact::update(['rel' => Contact::FOLLOWER], ['id' => $cid]);
} else {
Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
}
Queue::remove($activity);
}
/**
* Undo activity like "like" or "dislike"
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function undoActivity(array $activity)
{
if (empty($activity['object_id'])) {
return;
}
if (empty($activity['object_actor'])) {
return;
}
$author_id = Contact::getIdForURL($activity['object_actor']);
if (empty($author_id)) {
return;
}
Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => Item::GRAVITY_ACTIVITY]);
Queue::remove($activity);
}
/**
* Activity to remove a follower
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function undoFollowUser(array $activity)
{
$uid = User::getIdForURL($activity['object_object']);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
if (empty($owner)) {
return;
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
Logger::info('No contact found', ['actor' => $activity['actor']]);
return;
}
self::switchContact($cid);
$contact = DBA::selectFirst('contact', [], ['id' => $cid]);
if (!DBA::isResult($contact)) {
return;
}
Contact::removeFollower($contact);
Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
Queue::remove($activity);
}
/**
* Switches a contact to AP if needed
*
* @param integer $cid Contact ID
* @return void
* @throws \Exception
*/
private static function switchContact(int $cid)
{
$contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
return;
}
Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
Contact::updateFromProbe($cid);
}
/**
* 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): array
{
$parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
$parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
$implicit_mentions = [];
if (empty($parent_author['url'])) {
Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
} else {
$implicit_mentions[] = $parent_author['url'];
$implicit_mentions[] = $parent_author['nurl'];
$implicit_mentions[] = $parent_author['alias'];
}
if (!empty($parent['alias'])) {
$implicit_mentions[] = $parent['alias'];
}
foreach ($parent_terms as $term) {
$contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
if (!empty($contact['url'])) {
$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 $parent
* @return string
*/
private static function removeImplicitMentionsFromBody(string $body, array $parent): string
{
if (DI::config()->get('system', 'disable_implicit_mentions')) {
return $body;
}
$potential_mentions = self::getImplicitMentionList($parent);
$kept_mentions = [];
// Extract one prepended mention at a time from the body
while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
if (!in_array($matches[2], $potential_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);
}
/**
* Adds links to string mentions
*
* @param string $body
* @param array $tags
* @return string
*/
protected static function addMentionLinks(string $body, array $tags): string
{
// This prevents links to be added again to Pleroma-style mention links
$body = self::normalizeMentionLinks($body);
$body = BBCode::performWithEscapedTags($body, ['url'], function ($body) use ($tags) {
foreach ($tags as $tag) {
if (empty($tag['name']) || empty($tag['type']) || empty($tag['href']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
continue;
}
$hash = substr($tag['name'], 0, 1);
$name = substr($tag['name'], 1);
if (!in_array($hash, Tag::TAG_CHARACTER)) {
$hash = '';
$name = $tag['name'];
}
if (Network::isValidHttpUrl($tag['href'])) {
$body = str_replace($tag['name'], $hash . '[url=' . $tag['href'] . ']' . $name . '[/url]', $body);
}
}
return $body;
});
return $body;
}
}