3 * @copyright Copyright (C) 2020, Friendica
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
22 namespace Friendica\Protocol\ActivityPub;
24 use Friendica\Content\PageInfo;
25 use Friendica\Content\Text\BBCode;
26 use Friendica\Content\Text\HTML;
27 use Friendica\Core\Logger;
28 use Friendica\Core\Protocol;
29 use Friendica\Database\DBA;
31 use Friendica\Model\APContact;
32 use Friendica\Model\Contact;
33 use Friendica\Model\Conversation;
34 use Friendica\Model\Event;
35 use Friendica\Model\Item;
36 use Friendica\Model\ItemURI;
37 use Friendica\Model\Mail;
38 use Friendica\Model\Search;
39 use Friendica\Model\Tag;
40 use Friendica\Model\User;
41 use Friendica\Protocol\Activity;
42 use Friendica\Protocol\ActivityPub;
43 use Friendica\Util\DateTimeFormat;
44 use Friendica\Util\JsonLD;
45 use Friendica\Util\Strings;
46 use Text_LanguageDetect;
49 * ActivityPub Processor Protocol class
54 * Converts mentions from Pleroma into the Friendica format
58 * @return string converted body
60 private static function convertMentions($body)
62 $URLSearchString = "^\[\]";
63 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
69 * Replaces emojis in the body
71 * @param array $emojis
74 * @return string with replaced emojis
76 private static function replaceEmojis($body, array $emojis)
78 foreach ($emojis as $emoji) {
79 $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
80 $body = str_replace($emoji['name'], $replace, $body);
86 * Add attachment data to the item array
88 * @param array $activity
93 private static function constructAttachList($activity, $item)
95 if (empty($activity['attachments'])) {
99 foreach ($activity['attachments'] as $attach) {
100 switch ($attach['type']) {
103 'url' => $attach['url'],
104 'type' => $attach['type'],
105 'title' => $attach['title'] ?? '',
106 'text' => $attach['desc'] ?? '',
107 'image' => $attach['image'] ?? '',
111 $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
114 $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
115 if ($filetype == 'image') {
116 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
120 $item['body'] .= "\n";
122 // image is the preview/thumbnail URL
123 if (!empty($attach['image'])) {
124 $item['body'] .= '[url=' . $attach['url'] . ']';
125 $attach['url'] = $attach['image'];
128 if (empty($attach['name'])) {
129 $item['body'] .= '[img]' . $attach['url'] . '[/img]';
131 $item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
134 if (!empty($attach['image'])) {
135 $item['body'] .= '[/url]';
137 } elseif ($filetype == 'audio') {
138 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
142 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
143 } elseif ($filetype == 'video') {
144 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
148 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
150 if (!empty($item["attach"])) {
151 $item["attach"] .= ',';
153 $item["attach"] = '';
156 $item["attach"] .= '[attach]href="' . $attach['url'] . '" length="' . ($attach['length'] ?? '0') . '" type="' . $attach['mediaType'] . '" title="' . ($attach['name'] ?? '') . '"[/attach]';
167 * @param array $activity Activity array
168 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
170 public static function updateItem($activity)
172 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
173 if (!DBA::isResult($item)) {
174 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
175 $item = self::createItem($activity);
176 self::postItem($activity, $item);
180 $item['changed'] = DateTimeFormat::utcNow();
181 $item['edited'] = DateTimeFormat::utc($activity['updated']);
183 $item = self::processContent($activity, $item);
188 Item::update($item, ['uri' => $activity['id']]);
192 * Prepares data for a message
194 * @param array $activity Activity array
195 * @return array Internal item
196 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
197 * @throws \ImagickException
199 public static function createItem($activity)
202 $item['verb'] = Activity::POST;
203 $item['thr-parent'] = $activity['reply-to-id'];
205 if ($activity['reply-to-id'] == $activity['id']) {
206 $item['gravity'] = GRAVITY_PARENT;
207 $item['object-type'] = Activity\ObjectType::NOTE;
209 $item['gravity'] = GRAVITY_COMMENT;
210 $item['object-type'] = Activity\ObjectType::COMMENT;
213 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
214 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
215 self::fetchMissingActivity($activity['reply-to-id'], $activity);
218 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
220 /// @todo What to do with $activity['context']?
221 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
222 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
226 $item['network'] = Protocol::ACTIVITYPUB;
227 $item['author-link'] = $activity['author'];
228 $item['author-id'] = Contact::getIdForURL($activity['author']);
229 $item['owner-link'] = $activity['actor'];
230 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
232 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
233 $item['private'] = Item::UNLISTED;
234 } elseif (in_array(0, $activity['receiver'])) {
235 $item['private'] = Item::PUBLIC;
237 $item['private'] = Item::PRIVATE;
240 if (!empty($activity['raw'])) {
241 $item['source'] = $activity['raw'];
242 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
243 $item['conversation-href'] = $activity['context'] ?? '';
244 $item['conversation-uri'] = $activity['conversation'] ?? '';
246 if (isset($activity['push'])) {
247 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
251 $item['isForum'] = false;
253 if (!empty($activity['thread-completion'])) {
254 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
255 $item['causer-link'] = $item['owner-link'];
256 $item['causer-id'] = $item['owner-id'];
258 Logger::info('Ignoring actor because of thread completion.', ['actor' => $item['owner-link']]);
259 $item['owner-link'] = $item['author-link'];
260 $item['owner-id'] = $item['author-id'];
262 $actor = APContact::getByURL($item['owner-link'], false);
263 $item['isForum'] = ($actor['type'] == 'Group');
266 $item['uri'] = $activity['id'];
268 $item['created'] = DateTimeFormat::utc($activity['published']);
269 $item['edited'] = DateTimeFormat::utc($activity['updated']);
270 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
271 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
273 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
275 $item = self::processContent($activity, $item);
277 Logger::info('Message was not processed');
281 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
283 $item = self::constructAttachList($activity, $item);
291 * @param array $activity
292 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
293 * @throws \ImagickException
295 public static function deleteItem($activity)
297 $owner = Contact::getIdForURL($activity['actor']);
299 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
300 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
304 * Prepare the item array for an activity
306 * @param array $activity Activity array
307 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
308 * @throws \ImagickException
310 public static function addTag($activity)
312 if (empty($activity['object_content']) || empty($activity['object_id'])) {
316 foreach ($activity['receiver'] as $receiver) {
317 $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
318 if (!DBA::isResult($item)) {
319 // We don't fetch missing content for this purpose
323 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
324 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
328 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
329 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
334 * Prepare the item array for an activity
336 * @param array $activity Activity array
337 * @param string $verb Activity verb
338 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
339 * @throws \ImagickException
341 public static function createActivity($activity, $verb)
343 $item = self::createItem($activity);
344 $item['verb'] = $verb;
345 $item['thr-parent'] = $activity['object_id'];
346 $item['gravity'] = GRAVITY_ACTIVITY;
347 $item['object-type'] = Activity\ObjectType::NOTE;
349 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
351 self::postItem($activity, $item);
357 * @param array $activity Activity array
361 public static function createEvent($activity, $item)
363 $event['summary'] = HTML::toBBCode($activity['name']);
364 $event['desc'] = HTML::toBBCode($activity['content']);
365 $event['start'] = $activity['start-time'];
366 $event['finish'] = $activity['end-time'];
367 $event['nofinish'] = empty($event['finish']);
368 $event['location'] = $activity['location'];
369 $event['adjust'] = true;
370 $event['cid'] = $item['contact-id'];
371 $event['uid'] = $item['uid'];
372 $event['uri'] = $item['uri'];
373 $event['edited'] = $item['edited'];
374 $event['private'] = $item['private'];
375 $event['guid'] = $item['guid'];
376 $event['plink'] = $item['plink'];
378 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
379 $ev = DBA::selectFirst('event', ['id'], $condition);
380 if (DBA::isResult($ev)) {
381 $event['id'] = $ev['id'];
384 $event_id = Event::store($event);
385 Logger::info('Event was stored', ['id' => $event_id]);
389 * Process the content
391 * @param array $activity Activity array
393 * @return array|bool Returns the item array or false if there was an unexpected occurrence
396 private static function processContent($activity, $item)
398 $item['title'] = HTML::toBBCode($activity['name']);
400 if (!empty($activity['source'])) {
401 $item['body'] = $activity['source'];
403 $content = HTML::toBBCode($activity['content']);
405 if (!empty($activity['emojis'])) {
406 $content = self::replaceEmojis($content, $activity['emojis']);
409 $content = self::convertMentions($content);
411 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
412 $item_private = !in_array(0, $activity['item_receiver']);
413 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
414 if (!DBA::isResult($parent)) {
415 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
418 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
419 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
423 $content = self::removeImplicitMentionsFromBody($content, $parent);
425 $item['content-warning'] = HTML::toBBCode($activity['summary']);
426 $item['body'] = $content;
429 self::storeFromBody($item);
430 self::storeTags($item['uri-id'], $activity['tags']);
432 $item['location'] = $activity['location'];
434 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
435 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
438 $item['app'] = $activity['generator'];
444 * Store hashtags and mentions
448 private static function storeFromBody(array $item)
450 // Make sure to delete all existing tags (can happen when called via the update functionality)
451 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
453 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
457 * Generate a GUID out of an URL
459 * @param string $url message URL
460 * @return string with GUID
462 private static function getGUIDByURL(string $url)
464 $parsed = parse_url($url);
466 $host_hash = hash('crc32', $parsed['host']);
468 unset($parsed["scheme"]);
469 unset($parsed["host"]);
471 $path = implode("/", $parsed);
473 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
477 * Creates an item post
479 * @param array $activity Activity data
480 * @param array $item item array
481 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
482 * @throws \ImagickException
484 public static function postItem(array $activity, array $item)
492 foreach ($activity['receiver'] as $receiver) {
493 if ($receiver == -1) {
497 $item['uid'] = $receiver;
499 $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
501 case Receiver::TARGET_TO:
502 $item['post-type'] = Item::PT_TO;
504 case Receiver::TARGET_CC:
505 $item['post-type'] = Item::PT_CC;
507 case Receiver::TARGET_BTO:
508 $item['post-type'] = Item::PT_BTO;
510 case Receiver::TARGET_BCC:
511 $item['post-type'] = Item::PT_BCC;
513 case Receiver::TARGET_FOLLOWER:
514 $item['post-type'] = Item::PT_FOLLOWER;
516 case Receiver::TARGET_ANSWER:
517 $item['post-type'] = Item::PT_COMMENT;
519 case Receiver::TARGET_GLOBAL:
520 $item['post-type'] = Item::PT_GLOBAL;
523 $item['post-type'] = Item::PT_ARTICLE;
526 if (in_array($item['post-type'], [Item::PT_COMMENT, Item::PT_GLOBAL, Item::PT_ARTICLE])) {
527 if (!empty($activity['from-relay'])) {
528 $item['post-type'] = Item::PT_RELAY;
529 } elseif (!empty($activity['thread-completion'])) {
530 $item['post-type'] = Item::PT_FETCHED;
534 if (!empty($activity['from-relay'])) {
535 $item['causer-id'] = $activity['from-relay'];
538 if ($item['isForum'] ?? false) {
539 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
541 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
544 if (($receiver != 0) && empty($item['contact-id'])) {
545 $item['contact-id'] = Contact::getIdForURL($activity['author']);
548 if (!empty($activity['directmessage'])) {
549 self::postMail($activity, $item);
553 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
554 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
556 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
557 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
561 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
565 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
568 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
569 self::createEvent($activity, $item);
572 $item_id = Item::insert($item);
574 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
576 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
579 if ($item['uid'] == 0) {
584 // Store send a follow request for every reshare - but only when the item had been stored
585 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
586 $author = APContact::getByURL($item['owner-link'], false);
587 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
588 if ($author['type'] != 'Group') {
589 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
590 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
596 * Store tags and mentions into the tag table
598 * @param integer $uriid
601 private static function storeTags(int $uriid, array $tags = null)
603 foreach ($tags as $tag) {
604 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
608 $hash = substr($tag['name'], 0, 1);
610 if ($tag['type'] == 'Mention') {
611 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
612 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
613 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
614 $tag['name'] = substr($tag['name'], 1);
616 $type = Tag::IMPLICIT_MENTION;
618 if (!empty($tag['href'])) {
619 $apcontact = APContact::getByURL($tag['href']);
620 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
621 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
624 } elseif ($tag['type'] == 'Hashtag') {
625 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
626 $tag['name'] = substr($tag['name'], 1);
628 $type = Tag::HASHTAG;
631 if (empty($tag['name'])) {
635 Tag::store($uriid, $type, $tag['name'], $tag['href']);
640 * Creates an mail post
642 * @param array $activity Activity data
643 * @param array $item item array
644 * @return int|bool New mail table row id or false on error
645 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
647 private static function postMail($activity, $item)
649 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
650 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
654 Logger::info('Direct Message', $item);
657 $msg['uid'] = $item['uid'];
659 $msg['contact-id'] = $item['contact-id'];
661 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
662 $msg['from-name'] = $contact['name'];
663 $msg['from-url'] = $contact['url'];
664 $msg['from-photo'] = $contact['photo'];
666 $msg['uri'] = $item['uri'];
667 $msg['created'] = $item['created'];
669 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
670 if (DBA::isResult($parent)) {
671 $msg['parent-uri'] = $parent['parent-uri'];
672 $msg['title'] = $parent['title'];
674 $msg['parent-uri'] = $item['thr-parent'];
676 if (!empty($item['title'])) {
677 $msg['title'] = $item['title'];
678 } elseif (!empty($item['content-warning'])) {
679 $msg['title'] = $item['content-warning'];
681 // Trying to generate a title out of the body
682 $title = $item['body'];
684 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
685 $title = $matches[3];
688 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
690 if (strlen($title) > 20) {
691 $title = substr($title, 0, 20) . '...';
694 $msg['title'] = $title;
697 $msg['body'] = $item['body'];
699 return Mail::insert($msg);
703 * Fetches missing posts
705 * @param string $url message URL
706 * @param array $child activity array with the child of this message
707 * @param string $relay_actor Relay actor
708 * @return string fetched message URL
709 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
711 public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
713 if (!empty($child['receiver'])) {
714 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
719 $object = ActivityPub::fetchContent($url, $uid);
720 if (empty($object)) {
721 Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
725 if (empty($object['id'])) {
726 Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
730 if (!empty($object['actor'])) {
731 $object_actor = $object['actor'];
732 } elseif (!empty($object['attributedTo'])) {
733 $object_actor = $object['attributedTo'];
739 $signer = [$object_actor];
741 if (!empty($child['author'])) {
742 $actor = $child['author'];
745 $actor = $object_actor;
748 if (!empty($object['published'])) {
749 $published = $object['published'];
750 } elseif (!empty($child['published'])) {
751 $published = $child['published'];
753 $published = DateTimeFormat::utcNow();
757 $activity['@context'] = $object['@context'];
758 unset($object['@context']);
759 $activity['id'] = $object['id'];
760 $activity['to'] = $object['to'] ?? [];
761 $activity['cc'] = $object['cc'] ?? [];
762 $activity['actor'] = $actor;
763 $activity['object'] = $object;
764 $activity['published'] = $published;
765 $activity['type'] = 'Create';
767 $ldactivity = JsonLD::compact($activity);
769 $ldactivity['thread-completion'] = true;
770 $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
772 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
776 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
778 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
780 return $activity['id'];
784 * Test if incoming relay messages should be accepted
786 * @param array $activity activity array
787 * @param string $id object ID
788 * @return boolean true if message is accepted
790 private static function acceptIncomingMessage(array $activity, string $id)
792 if (empty($activity['as:object'])) {
793 Logger::info('No object field in activity - accepted', ['id' => $id]);
797 $config = DI::config();
799 $subscribe = $config->get('system', 'relay_subscribe', false);
801 $scope = $config->get('system', 'relay_scope', SR_SCOPE_ALL);
803 $scope = SR_SCOPE_NONE;
806 if ($scope == SR_SCOPE_ALL) {
807 Logger::info('Server accept all posts - accepted', ['id' => $id]);
811 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
812 if (Item::exists(['uri' => $replyto])) {
813 Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'replyto' => $replyto]);
817 if ($scope == SR_SCOPE_NONE) {
818 Logger::info('Server does not accept relay posts - rejected', ['id' => $id]);
823 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
825 foreach ($tags as $tag) {
826 if ($tag['type'] != 'Hashtag') {
829 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
836 if ($scope == SR_SCOPE_TAGS) {
837 $server_tags = $config->get('system', 'relay_server_tags', []);
838 $tagitems = explode(',', mb_strtolower($server_tags));
840 foreach ($tagitems AS $tag) {
841 $systemTags[] = trim($tag, '# ');
844 if ($config->get('system', 'relay_user_tags')) {
845 $userTags = Search::getUserTags();
849 $content = mb_strtolower(BBCode::toPlaintext(HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value')), false));
851 $tagList = array_unique(array_merge($systemTags, $userTags));
852 foreach ($messageTags as $tag) {
853 if (in_array($tag, $tagList)) {
854 Logger::info('Subscribed hashtag found - accepted', ['id' => $id, 'hashtag' => $tag]);
857 // We check with "strpos" for performance issues. Only when this is true, the regular expression check is used
858 // RegExp is taken from here: https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
859 if ((strpos($content, $tag) !== false) && preg_match('/(?<=[\s,.:;"\']|^)' . $tag . '(?=[\s,.:;"\']|$)/', $content)) {
860 Logger::info('Subscribed hashtag found in content - accepted', ['id' => $id, 'hashtag' => $tag]);
865 Logger::info('No matching hashtags found - rejected', ['id' => $id]);
870 * perform a "follow" request
872 * @param array $activity
873 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
874 * @throws \ImagickException
876 public static function followUser($activity)
878 $uid = User::getIdForURL($activity['object_id']);
883 $owner = User::getOwnerDataById($uid);
888 $cid = Contact::getIdForURL($activity['actor'], $uid);
890 self::switchContact($cid);
891 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
892 $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
897 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
898 'author-link' => $activity['actor']];
900 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
902 // Ensure that the contact has got the right network type
903 self::switchContact($item['author-id']);
905 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
906 if ($result === true) {
907 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
910 $cid = Contact::getIdForURL($activity['actor'], $uid);
915 if (empty($contact)) {
916 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
919 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
923 * Update the given profile
925 * @param array $activity
928 public static function updatePerson($activity)
930 if (empty($activity['object_id'])) {
934 Logger::info('Updating profile', ['object' => $activity['object_id']]);
935 Contact::updateFromProbeByURL($activity['object_id']);
939 * Delete the given profile
941 * @param array $activity
942 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
944 public static function deletePerson($activity)
946 if (empty($activity['object_id']) || empty($activity['actor'])) {
947 Logger::info('Empty object id or actor.');
951 if ($activity['object_id'] != $activity['actor']) {
952 Logger::info('Object id does not match actor.');
956 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
957 while ($contact = DBA::fetch($contacts)) {
958 Contact::remove($contact['id']);
960 DBA::close($contacts);
962 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
966 * Accept a follow request
968 * @param array $activity
969 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
970 * @throws \ImagickException
972 public static function acceptFollowUser($activity)
974 $uid = User::getIdForURL($activity['object_actor']);
979 $cid = Contact::getIdForURL($activity['actor'], $uid);
981 Logger::info('No contact found', ['actor' => $activity['actor']]);
985 self::switchContact($cid);
987 $fields = ['pending' => false];
989 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
990 if ($contact['rel'] == Contact::FOLLOWER) {
991 $fields['rel'] = Contact::FRIEND;
994 $condition = ['id' => $cid];
995 DBA::update('contact', $fields, $condition);
996 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1000 * Reject a follow request
1002 * @param array $activity
1003 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1004 * @throws \ImagickException
1006 public static function rejectFollowUser($activity)
1008 $uid = User::getIdForURL($activity['object_actor']);
1013 $cid = Contact::getIdForURL($activity['actor'], $uid);
1015 Logger::info('No contact found', ['actor' => $activity['actor']]);
1019 self::switchContact($cid);
1021 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1022 Contact::remove($cid);
1023 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1025 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1030 * Undo activity like "like" or "dislike"
1032 * @param array $activity
1033 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1034 * @throws \ImagickException
1036 public static function undoActivity($activity)
1038 if (empty($activity['object_id'])) {
1042 if (empty($activity['object_actor'])) {
1046 $author_id = Contact::getIdForURL($activity['object_actor']);
1047 if (empty($author_id)) {
1051 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1055 * Activity to remove a follower
1057 * @param array $activity
1058 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1059 * @throws \ImagickException
1061 public static function undoFollowUser($activity)
1063 $uid = User::getIdForURL($activity['object_object']);
1068 $owner = User::getOwnerDataById($uid);
1069 if (empty($owner)) {
1073 $cid = Contact::getIdForURL($activity['actor'], $uid);
1075 Logger::info('No contact found', ['actor' => $activity['actor']]);
1079 self::switchContact($cid);
1081 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1082 if (!DBA::isResult($contact)) {
1086 Contact::removeFollower($owner, $contact);
1087 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1091 * Switches a contact to AP if needed
1093 * @param integer $cid Contact ID
1094 * @throws \Exception
1096 private static function switchContact($cid)
1098 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1099 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1103 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1104 Contact::updateFromProbe($cid);
1108 * Collects implicit mentions like:
1109 * - the author of the parent item
1110 * - all the mentioned conversants in the parent item
1112 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1114 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1116 private static function getImplicitMentionList(array $parent)
1118 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1120 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1122 $implicit_mentions = [];
1123 if (empty($parent_author['url'])) {
1124 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
1126 $implicit_mentions[] = $parent_author['url'];
1127 $implicit_mentions[] = $parent_author['nurl'];
1128 $implicit_mentions[] = $parent_author['alias'];
1131 if (!empty($parent['alias'])) {
1132 $implicit_mentions[] = $parent['alias'];
1135 foreach ($parent_terms as $term) {
1136 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1137 if (!empty($contact['url'])) {
1138 $implicit_mentions[] = $contact['url'];
1139 $implicit_mentions[] = $contact['nurl'];
1140 $implicit_mentions[] = $contact['alias'];
1144 return $implicit_mentions;
1148 * Strips from the body prepended implicit mentions
1150 * @param string $body
1151 * @param array $parent
1154 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1156 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1160 $potential_mentions = self::getImplicitMentionList($parent);
1162 $kept_mentions = [];
1164 // Extract one prepended mention at a time from the body
1165 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1166 if (!in_array($matches[2], $potential_mentions)) {
1167 $kept_mentions[] = $matches[1];
1170 $body = $matches[3];
1173 // Re-appending the kept mentions to the body after extraction
1174 $kept_mentions[] = $body;
1176 return implode('', $kept_mentions);