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

1185 lines
35 KiB
PHP

<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Protocol\ActivityPub;
use Friendica\Content\PageInfo;
use Friendica\Content\Text\BBCode;
use Friendica\Content\Text\HTML;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
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\Item;
use Friendica\Model\ItemURI;
use Friendica\Model\Mail;
use Friendica\Model\Search;
use Friendica\Model\Tag;
use Friendica\Model\User;
use Friendica\Protocol\Activity;
use Friendica\Protocol\ActivityPub;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\JsonLD;
use Friendica\Util\Strings;
use Text_LanguageDetect;
/**
* 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 $body
*
* @return string with replaced emojis
*/
private static function replaceEmojis($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;
}
/**
* Add attachment data to the item array
*
* @param array $activity
* @param array $item
*
* @return array array
*/
private static function constructAttachList($activity, $item)
{
if (empty($activity['attachments'])) {
return $item;
}
foreach ($activity['attachments'] as $attach) {
switch ($attach['type']) {
case 'link':
$data = [
'url' => $attach['url'],
'type' => $attach['type'],
'title' => $attach['title'] ?? '',
'text' => $attach['desc'] ?? '',
'image' => $attach['image'] ?? '',
'images' => [],
'keywords' => [],
];
$item['body'] = PageInfo::appendDataToBody($item['body'], $data);
break;
default:
$filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
if ($filetype == 'image') {
if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
continue 2;
}
$item['body'] .= "\n";
// image is the preview/thumbnail URL
if (!empty($attach['image'])) {
$item['body'] .= '[url=' . $attach['url'] . ']';
$attach['url'] = $attach['image'];
}
if (empty($attach['name'])) {
$item['body'] .= '[img]' . $attach['url'] . '[/img]';
} else {
$item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
}
if (!empty($attach['image'])) {
$item['body'] .= '[/url]';
}
} elseif ($filetype == 'audio') {
if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
continue 2;
}
$item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
} elseif ($filetype == 'video') {
if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
continue 2;
}
$item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
} else {
if (!empty($item["attach"])) {
$item["attach"] .= ',';
} else {
$item["attach"] = '';
}
$item["attach"] .= '[attach]href="' . $attach['url'] . '" length="' . ($attach['length'] ?? '0') . '" type="' . $attach['mediaType'] . '" title="' . ($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', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
if (!DBA::isResult($item)) {
Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
$item = self::createItem($activity);
self::postItem($activity, $item);
return;
}
$item['changed'] = DateTimeFormat::utcNow();
$item['edited'] = DateTimeFormat::utc($activity['updated']);
$item = self::processContent($activity, $item);
if (empty($item)) {
return;
}
Item::update($item, ['uri' => $activity['id']]);
}
/**
* Prepares data for a message
*
* @param array $activity Activity array
* @return array Internal item
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function createItem($activity)
{
$item = [];
$item['verb'] = Activity::POST;
$item['thr-parent'] = $activity['reply-to-id'];
if ($activity['reply-to-id'] == $activity['id']) {
$item['gravity'] = GRAVITY_PARENT;
$item['object-type'] = Activity\ObjectType::NOTE;
} else {
$item['gravity'] = GRAVITY_COMMENT;
$item['object-type'] = Activity\ObjectType::COMMENT;
}
if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
self::fetchMissingActivity($activity['reply-to-id'], $activity);
}
$item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
/// @todo What to do with $activity['context']?
if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
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;
$item['conversation-href'] = $activity['context'] ?? '';
$item['conversation-uri'] = $activity['conversation'] ?? '';
if (isset($activity['push'])) {
$item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
}
}
$item['isForum'] = false;
if (!empty($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'] == 'Group');
}
$item['uri'] = $activity['id'];
$item['created'] = DateTimeFormat::utc($activity['published']);
$item['edited'] = DateTimeFormat::utc($activity['updated']);
$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']]);
$item = self::processContent($activity, $item);
if (empty($item)) {
Logger::info('Message was not processed');
return [];
}
$item['plink'] = $activity['alternate-url'] ?? $item['uri'];
$item = self::constructAttachList($activity, $item);
return $item;
}
/**
* Delete items
*
* @param array $activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function deleteItem($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]);
}
/**
* Prepare the item array for an activity
*
* @param array $activity Activity array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function addTag($activity)
{
if (empty($activity['object_content']) || empty($activity['object_id'])) {
return;
}
foreach ($activity['receiver'] as $receiver) {
$item = Item::selectFirst(['id', 'uri-id', 'tag', '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 $verb Activity verb
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function createActivity($activity, $verb)
{
$item = self::createItem($activity);
$item['verb'] = $verb;
$item['thr-parent'] = $activity['object_id'];
$item['gravity'] = GRAVITY_ACTIVITY;
$item['object-type'] = Activity\ObjectType::NOTE;
$item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
self::postItem($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::info('Event was stored', ['id' => $event_id]);
}
/**
* Process the content
*
* @param array $activity Activity array
* @param array $item
* @return array|bool Returns the item array or false if there was an unexpected occurrence
* @throws \Exception
*/
private static function processContent($activity, $item)
{
$item['title'] = HTML::toBBCode($activity['name']);
if (!empty($activity['source'])) {
$item['body'] = $activity['source'];
} else {
$content = HTML::toBBCode($activity['content']);
if (!empty($activity['emojis'])) {
$content = self::replaceEmojis($content, $activity['emojis']);
}
$content = self::convertMentions($content);
if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
$item_private = !in_array(0, $activity['item_receiver']);
$parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
if (!DBA::isResult($parent)) {
Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
return false;
}
if ($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['body'] = $content;
}
self::storeFromBody($item);
self::storeTags($item['uri-id'], $activity['tags']);
$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
*
* @param string $url message URL
* @return string with GUID
*/
private static function getGUIDByURL(string $url)
{
$parsed = parse_url($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);
}
/**
* 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;
}
$stored = false;
ksort($activity['receiver']);
foreach ($activity['receiver'] as $receiver) {
if ($receiver == -1) {
continue;
}
$item['uid'] = $receiver;
$type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
switch($type) {
case Receiver::TARGET_TO:
$item['post-type'] = Item::PT_TO;
break;
case Receiver::TARGET_CC:
$item['post-type'] = Item::PT_CC;
break;
case Receiver::TARGET_BTO:
$item['post-type'] = Item::PT_BTO;
break;
case Receiver::TARGET_BCC:
$item['post-type'] = Item::PT_BCC;
break;
case Receiver::TARGET_FOLLOWER:
$item['post-type'] = Item::PT_FOLLOWER;
break;
case Receiver::TARGET_ANSWER:
$item['post-type'] = Item::PT_COMMENT;
break;
case Receiver::TARGET_GLOBAL:
$item['post-type'] = Item::PT_GLOBAL;
break;
default:
$item['post-type'] = Item::PT_ARTICLE;
}
if (!empty($activity['from-relay'])) {
$item['post-type'] = Item::PT_RELAY;
} elseif (!empty($activity['thread-completion'])) {
$item['post-type'] = Item::PT_FETCHED;
}
if ($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, $item);
continue;
}
if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
$skip = !Contact::isSharingByURL($activity['author'], $receiver);
if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
$skip = !Contact::isSharingByURL($activity['actor'], $receiver);
}
if ($skip) {
Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
continue;
}
Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
}
if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
self::createEvent($activity, $item);
}
$item_id = Item::insert($item);
if ($item_id) {
Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
} else {
Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
}
if ($item['uid'] == 0) {
$stored = $item_id;
}
}
// Store send a follow request for every reshare - but only when the item had been stored
if ($stored && ($item['private'] != Item::PRIVATE) && ($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::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
}
}
}
/**
* 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']);
}
}
/**
* Creates an mail post
*
* @param array $activity Activity data
* @param array $item item array
* @return int|bool New mail table row id or false on error
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
private static function postMail($activity, $item)
{
if (($item['gravity'] != 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];
}
$title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
if (strlen($title) > 20) {
$title = substr($title, 0, 20) . '...';
}
$msg['title'] = $title;
}
}
$msg['body'] = $item['body'];
return Mail::insert($msg);
}
/**
* 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
* @return string fetched message URL
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
{
if (!empty($child['receiver'])) {
$uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
} else {
$uid = 0;
}
$object = ActivityPub::fetchContent($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 '';
}
if (!empty($object['actor'])) {
$object_actor = $object['actor'];
} elseif (!empty($object['attributedTo'])) {
$object_actor = $object['attributedTo'];
} 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'] = $object['@context'];
unset($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);
if (!empty($relay_actor)) {
$ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
} elseif (!empty($child['thread-completion'])) {
$ldactivity['thread-completion'] = $child['thread-completion'];
} else {
$ldactivity['thread-completion'] = Contact::getIdForURL($actor);
}
if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
return '';
}
ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
Logger::notice('Activity had been fetched and processed.', ['url' => $url, '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 $id)
{
if (empty($activity['as:object'])) {
Logger::info('No object field in activity - accepted', ['id' => $id]);
return true;
}
$config = DI::config();
$subscribe = $config->get('system', 'relay_subscribe', false);
if ($subscribe) {
$scope = $config->get('system', 'relay_scope', SR_SCOPE_ALL);
} else {
$scope = SR_SCOPE_NONE;
}
if ($scope == SR_SCOPE_ALL) {
Logger::info('Server accept all posts - accepted', ['id' => $id]);
return true;
}
$replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
if (Item::exists(['uri' => $replyto])) {
Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'replyto' => $replyto]);
return true;
}
if ($scope == SR_SCOPE_NONE) {
Logger::info('Server does not accept relay posts - rejected', ['id' => $id]);
return false;
}
$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']), '#');
}
}
$systemTags = [];
$userTags = [];
if ($scope == SR_SCOPE_TAGS) {
$server_tags = $config->get('system', 'relay_server_tags', []);
$tagitems = explode(',', mb_strtolower($server_tags));
foreach ($tagitems AS $tag) {
$systemTags[] = trim($tag, '# ');
}
if ($config->get('system', 'relay_user_tags')) {
$userTags = Search::getUserTags();
}
}
$content = mb_strtolower(BBCode::toPlaintext(HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value')), false));
$tagList = array_unique(array_merge($systemTags, $userTags));
foreach ($messageTags as $tag) {
if (in_array($tag, $tagList)) {
Logger::info('Subscribed hashtag found - accepted', ['id' => $id, 'hashtag' => $tag]);
return true;
}
// We check with "strpos" for performance issues. Only when this is true, the regular expression check is used
// RegExp is taken from here: https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
if ((strpos($content, $tag) !== false) && preg_match('/(?<=[\s,.:;"\']|^)' . preg_quote($tag, '/') . '(?=[\s,.:;"\']|$)/', $content)) {
Logger::info('Subscribed hashtag found in content - accepted', ['id' => $id, 'hashtag' => $tag]);
return true;
}
}
Logger::info('No matching hashtags found - rejected', ['id' => $id]);
return false;
}
/**
* 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);
if (empty($owner)) {
return;
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (!empty($cid)) {
self::switchContact($cid);
DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
$contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
} else {
$contact = [];
}
$item = ['author-id' => Contact::getIdForURL($activity['actor']),
'author-link' => $activity['actor']];
$note = Strings::escapeTags(trim($activity['content'] ?? ''));
// Ensure that the contact has got the right network type
self::switchContact($item['author-id']);
$result = Contact::addRelationship($owner, $contact, $item, false, $note);
if ($result === true) {
ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
}
$cid = Contact::getIdForURL($activity['actor'], $uid);
if (empty($cid)) {
return;
}
if (empty($contact)) {
DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['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::info('Updating profile', ['object' => $activity['object_id']]);
Contact::updateFromProbeByURL($activity['object_id']);
}
/**
* 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::info('Empty object id or actor.');
return;
}
if ($activity['object_id'] != $activity['actor']) {
Logger::info('Object id does not match actor.');
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']]);
}
/**
* 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::info('No contact found', ['actor' => $activity['actor']]);
return;
}
self::switchContact($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::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
}
/**
* 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::info('No contact found', ['actor' => $activity['actor']]);
return;
}
self::switchContact($cid);
if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
Contact::remove($cid);
Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
} else {
Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
}
}
/**
* 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::markForDeletion(['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);
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($owner, $contact);
Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
}
/**
* Switches a contact to AP if needed
*
* @param integer $cid Contact ID
* @throws \Exception
*/
private static function switchContact($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)
{
$parent_terms = Tag::getByURIId($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'], 'item-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)
{
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);
}
}