3 * @copyright Copyright (C) 2010-2021, the Friendica project
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\Text\BBCode;
25 use Friendica\Content\Text\HTML;
26 use Friendica\Content\Text\Markdown;
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\GServer;
36 use Friendica\Model\Item;
37 use Friendica\Model\ItemURI;
38 use Friendica\Model\Mail;
39 use Friendica\Model\Tag;
40 use Friendica\Model\User;
41 use Friendica\Model\Post;
42 use Friendica\Protocol\Activity;
43 use Friendica\Protocol\ActivityPub;
44 use Friendica\Protocol\Relay;
45 use Friendica\Util\DateTimeFormat;
46 use Friendica\Util\JsonLD;
47 use Friendica\Util\Strings;
50 * ActivityPub Processor Protocol class
55 * Converts mentions from Pleroma into the Friendica format
59 * @return string converted body
61 private static function convertMentions($body)
63 $URLSearchString = "^\[\]";
64 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
70 * Convert the language array into a language JSON
72 * @param array $languages
73 * @return string language JSON
75 private static function processLanguages(array $languages)
77 $codes = array_keys($languages);
79 foreach ($codes as $code) {
87 return json_encode($lang);
90 * Replaces emojis in the body
92 * @param array $emojis
95 * @return string with replaced emojis
97 private static function replaceEmojis($body, array $emojis)
101 array_column($emojis, 'name'),
102 array_map(function ($emoji) {
103 return '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
112 * Store attached media files in the post-media table
115 * @param array $attachment
118 private static function storeAttachmentAsMedia(int $uriid, array $attachment)
120 if (empty($attachment['url'])) {
124 $data = ['uri-id' => $uriid];
125 $data['type'] = Post\Media::UNKNOWN;
126 $data['url'] = $attachment['url'];
127 $data['mimetype'] = $attachment['mediaType'];
128 $data['height'] = $attachment['height'] ?? null;
129 $data['size'] = $attachment['size'] ?? null;
130 $data['preview'] = $attachment['image'] ?? null;
131 $data['description'] = $attachment['name'] ?? null;
133 Post\Media::insert($data);
137 * Stire attachment data
139 * @param array $activity
142 private static function storeAttachments($activity, $item)
144 if (empty($activity['attachments'])) {
148 foreach ($activity['attachments'] as $attach) {
149 self::storeAttachmentAsMedia($item['uri-id'], $attach);
156 * @param array $activity Activity array
157 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
159 public static function updateItem($activity)
161 $item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity', 'post-type'], ['uri' => $activity['id']]);
162 if (!DBA::isResult($item)) {
163 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
164 $item = self::createItem($activity);
165 self::postItem($activity, $item);
169 $item['changed'] = DateTimeFormat::utcNow();
170 $item['edited'] = DateTimeFormat::utc($activity['updated']);
172 $item = self::processContent($activity, $item);
174 self::storeAttachments($activity, $item);
180 Item::update($item, ['uri' => $activity['id']]);
184 * Prepares data for a message
186 * @param array $activity Activity array
187 * @return array Internal item
188 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
189 * @throws \ImagickException
191 public static function createItem($activity)
194 $item['verb'] = Activity::POST;
195 $item['thr-parent'] = $activity['reply-to-id'];
197 if ($activity['reply-to-id'] == $activity['id']) {
198 $item['gravity'] = GRAVITY_PARENT;
199 $item['object-type'] = Activity\ObjectType::NOTE;
201 $item['gravity'] = GRAVITY_COMMENT;
202 $item['object-type'] = Activity\ObjectType::COMMENT;
205 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
206 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
207 self::fetchMissingActivity($activity['reply-to-id'], $activity);
210 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
212 /// @todo What to do with $activity['context']?
213 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
214 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
218 $item['network'] = Protocol::ACTIVITYPUB;
219 $item['author-link'] = $activity['author'];
220 $item['author-id'] = Contact::getIdForURL($activity['author']);
221 $item['owner-link'] = $activity['actor'];
222 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
224 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
225 $item['private'] = Item::UNLISTED;
226 } elseif (in_array(0, $activity['receiver'])) {
227 $item['private'] = Item::PUBLIC;
229 $item['private'] = Item::PRIVATE;
232 if (!empty($activity['raw'])) {
233 $item['source'] = $activity['raw'];
234 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
235 $item['conversation-href'] = $activity['context'] ?? '';
236 $item['conversation-uri'] = $activity['conversation'] ?? '';
238 if (isset($activity['push'])) {
239 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
243 if (!empty($activity['from-relay'])) {
244 $item['direction'] = Conversation::RELAY;
247 if ($activity['object_type'] == 'as:Article') {
248 $item['post-type'] = Item::PT_ARTICLE;
249 } elseif ($activity['object_type'] == 'as:Audio') {
250 $item['post-type'] = Item::PT_AUDIO;
251 } elseif ($activity['object_type'] == 'as:Document') {
252 $item['post-type'] = Item::PT_DOCUMENT;
253 } elseif ($activity['object_type'] == 'as:Event') {
254 $item['post-type'] = Item::PT_EVENT;
255 } elseif ($activity['object_type'] == 'as:Image') {
256 $item['post-type'] = Item::PT_IMAGE;
257 } elseif ($activity['object_type'] == 'as:Page') {
258 $item['post-type'] = Item::PT_PAGE;
259 } elseif ($activity['object_type'] == 'as:Video') {
260 $item['post-type'] = Item::PT_VIDEO;
262 $item['post-type'] = Item::PT_NOTE;
265 $item['isForum'] = false;
267 if (!empty($activity['thread-completion'])) {
268 if ($activity['thread-completion'] != $item['owner-id']) {
269 $actor = Contact::getById($activity['thread-completion'], ['url']);
270 $item['causer-link'] = $actor['url'];
271 $item['causer-id'] = $activity['thread-completion'];
272 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
274 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
275 $item['causer-link'] = $item['owner-link'];
276 $item['causer-id'] = $item['owner-id'];
277 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
280 $item['owner-link'] = $item['author-link'];
281 $item['owner-id'] = $item['author-id'];
283 $actor = APContact::getByURL($item['owner-link'], false);
284 $item['isForum'] = ($actor['type'] == 'Group');
287 $item['uri'] = $activity['id'];
289 $item['created'] = DateTimeFormat::utc($activity['published']);
290 $item['edited'] = DateTimeFormat::utc($activity['updated']);
291 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
292 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
294 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
295 if (empty($item['uri-id'])) {
296 Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
300 $item = self::processContent($activity, $item);
302 Logger::info('Message was not processed');
306 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
308 self::storeAttachments($activity, $item);
310 // We received the post via AP, so we set the protocol of the server to AP
311 $contact = Contact::getById($item['author-id'], ['gsid']);
312 if (!empty($contact['gsid'])) {
313 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
316 if ($item['author-id'] != $item['owner-id']) {
317 $contact = Contact::getById($item['owner-id'], ['gsid']);
318 if (!empty($contact['gsid'])) {
319 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
329 * @param array $activity
330 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
331 * @throws \ImagickException
333 public static function deleteItem($activity)
335 $owner = Contact::getIdForURL($activity['actor']);
337 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
338 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
342 * Prepare the item array for an activity
344 * @param array $activity Activity array
345 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
346 * @throws \ImagickException
348 public static function addTag($activity)
350 if (empty($activity['object_content']) || empty($activity['object_id'])) {
354 foreach ($activity['receiver'] as $receiver) {
355 $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
356 if (!DBA::isResult($item)) {
357 // We don't fetch missing content for this purpose
361 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
362 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
366 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
367 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
372 * Prepare the item array for an activity
374 * @param array $activity Activity array
375 * @param string $verb Activity verb
376 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
377 * @throws \ImagickException
379 public static function createActivity($activity, $verb)
381 $item = self::createItem($activity);
382 $item['verb'] = $verb;
383 $item['thr-parent'] = $activity['object_id'];
384 $item['gravity'] = GRAVITY_ACTIVITY;
385 unset($item['post-type']);
386 $item['object-type'] = Activity\ObjectType::NOTE;
388 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
390 self::postItem($activity, $item);
396 * @param array $activity Activity array
400 public static function createEvent($activity, $item)
402 $event['summary'] = HTML::toBBCode($activity['name']);
403 $event['desc'] = HTML::toBBCode($activity['content']);
404 $event['start'] = $activity['start-time'];
405 $event['finish'] = $activity['end-time'];
406 $event['nofinish'] = empty($event['finish']);
407 $event['location'] = $activity['location'];
408 $event['adjust'] = $activity['adjust'] ?? true;
409 $event['cid'] = $item['contact-id'];
410 $event['uid'] = $item['uid'];
411 $event['uri'] = $item['uri'];
412 $event['edited'] = $item['edited'];
413 $event['private'] = $item['private'];
414 $event['guid'] = $item['guid'];
415 $event['plink'] = $item['plink'];
416 $event['network'] = $item['network'];
417 $event['protocol'] = $item['protocol'];
418 $event['direction'] = $item['direction'];
419 $event['source'] = $item['source'];
421 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
422 $ev = DBA::selectFirst('event', ['id'], $condition);
423 if (DBA::isResult($ev)) {
424 $event['id'] = $ev['id'];
427 $event_id = Event::store($event);
428 Logger::info('Event was stored', ['id' => $event_id]);
432 * Process the content
434 * @param array $activity Activity array
436 * @return array|bool Returns the item array or false if there was an unexpected occurrence
439 private static function processContent($activity, $item)
441 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
442 $item['title'] = Markdown::toBBCode($activity['name']);
443 $content = Markdown::toBBCode($activity['content']);
444 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
445 $item['title'] = $activity['name'];
446 $content = $activity['content'];
448 // By default assume "text/html"
449 $item['title'] = HTML::toBBCode($activity['name']);
450 $content = HTML::toBBCode($activity['content']);
453 if (!empty($activity['languages'])) {
454 $item['language'] = self::processLanguages($activity['languages']);
457 if (!empty($activity['emojis'])) {
458 $content = self::replaceEmojis($content, $activity['emojis']);
461 $content = self::convertMentions($content);
463 if (!empty($activity['source'])) {
464 $item['body'] = $activity['source'];
465 $item['raw-body'] = $content;
466 $item['body'] = Item::improveSharedDataInBody($item);
468 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
469 $item_private = !in_array(0, $activity['item_receiver']);
470 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
471 if (!DBA::isResult($parent)) {
472 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
475 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
476 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
480 $content = self::removeImplicitMentionsFromBody($content, $parent);
482 $item['content-warning'] = HTML::toBBCode($activity['summary']);
483 $item['raw-body'] = $item['body'] = $content;
486 self::storeFromBody($item);
487 self::storeTags($item['uri-id'], $activity['tags']);
489 $item['location'] = $activity['location'];
491 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
492 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
495 $item['app'] = $activity['generator'];
501 * Store hashtags and mentions
505 private static function storeFromBody(array $item)
507 // Make sure to delete all existing tags (can happen when called via the update functionality)
508 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
510 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
514 * Generate a GUID out of an URL
516 * @param string $url message URL
517 * @return string with GUID
519 private static function getGUIDByURL(string $url)
521 $parsed = parse_url($url);
523 $host_hash = hash('crc32', $parsed['host']);
525 unset($parsed["scheme"]);
526 unset($parsed["host"]);
528 $path = implode("/", $parsed);
530 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
534 * Creates an item post
536 * @param array $activity Activity data
537 * @param array $item item array
538 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
539 * @throws \ImagickException
541 public static function postItem(array $activity, array $item)
548 ksort($activity['receiver']);
550 foreach ($activity['receiver'] as $receiver) {
551 if ($receiver == -1) {
555 $item['uid'] = $receiver;
557 $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
559 case Receiver::TARGET_TO:
560 $item['post-reason'] = Item::PR_TO;
562 case Receiver::TARGET_CC:
563 $item['post-reason'] = Item::PR_CC;
565 case Receiver::TARGET_BTO:
566 $item['post-reason'] = Item::PR_BTO;
568 case Receiver::TARGET_BCC:
569 $item['post-reason'] = Item::PR_BCC;
571 case Receiver::TARGET_FOLLOWER:
572 $item['post-reason'] = Item::PR_FOLLOWER;
574 case Receiver::TARGET_ANSWER:
575 $item['post-reason'] = Item::PR_COMMENT;
577 case Receiver::TARGET_GLOBAL:
578 $item['post-reason'] = Item::PR_GLOBAL;
581 $item['post-reason'] = Item::PR_NONE;
584 if (!empty($activity['from-relay'])) {
585 $item['post-reason'] = Item::PR_RELAY;
586 } elseif (!empty($activity['thread-completion'])) {
587 $item['post-reason'] = Item::PR_FETCHED;
590 if ($item['isForum'] ?? false) {
591 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
593 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
596 if (($receiver != 0) && empty($item['contact-id'])) {
597 $item['contact-id'] = Contact::getIdForURL($activity['author']);
600 if (!empty($activity['directmessage'])) {
601 self::postMail($activity, $item);
605 if (!($item['isForum'] ?? false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT) &&
606 ($item['post-reason'] == Item::PR_BCC) && !Contact::isSharingByURL($activity['author'], $receiver)) {
607 Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id']]);
611 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
612 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
614 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
615 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
619 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
623 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
626 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
627 self::createEvent($activity, $item);
630 $item_id = Item::insert($item);
632 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
634 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
637 if ($item['uid'] == 0) {
642 // Store send a follow request for every reshare - but only when the item had been stored
643 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
644 $author = APContact::getByURL($item['owner-link'], false);
645 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
646 if ($author['type'] != 'Group') {
647 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
648 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
654 * Store tags and mentions into the tag table
656 * @param integer $uriid
659 private static function storeTags(int $uriid, array $tags = null)
661 foreach ($tags as $tag) {
662 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
666 $hash = substr($tag['name'], 0, 1);
668 if ($tag['type'] == 'Mention') {
669 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
670 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
671 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
672 $tag['name'] = substr($tag['name'], 1);
674 $type = Tag::IMPLICIT_MENTION;
676 if (!empty($tag['href'])) {
677 $apcontact = APContact::getByURL($tag['href']);
678 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
679 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
682 } elseif ($tag['type'] == 'Hashtag') {
683 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
684 $tag['name'] = substr($tag['name'], 1);
686 $type = Tag::HASHTAG;
689 if (empty($tag['name'])) {
693 Tag::store($uriid, $type, $tag['name'], $tag['href']);
698 * Creates an mail post
700 * @param array $activity Activity data
701 * @param array $item item array
702 * @return int|bool New mail table row id or false on error
703 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
705 private static function postMail($activity, $item)
707 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
708 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
712 Logger::info('Direct Message', $item);
715 $msg['uid'] = $item['uid'];
717 $msg['contact-id'] = $item['contact-id'];
719 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
720 $msg['from-name'] = $contact['name'];
721 $msg['from-url'] = $contact['url'];
722 $msg['from-photo'] = $contact['photo'];
724 $msg['uri'] = $item['uri'];
725 $msg['created'] = $item['created'];
727 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
728 if (DBA::isResult($parent)) {
729 $msg['parent-uri'] = $parent['parent-uri'];
730 $msg['title'] = $parent['title'];
732 $msg['parent-uri'] = $item['thr-parent'];
734 if (!empty($item['title'])) {
735 $msg['title'] = $item['title'];
736 } elseif (!empty($item['content-warning'])) {
737 $msg['title'] = $item['content-warning'];
739 // Trying to generate a title out of the body
740 $title = $item['body'];
742 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
743 $title = $matches[3];
746 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
748 if (strlen($title) > 20) {
749 $title = substr($title, 0, 20) . '...';
752 $msg['title'] = $title;
755 $msg['body'] = $item['body'];
757 return Mail::insert($msg);
761 * Fetches missing posts
763 * @param string $url message URL
764 * @param array $child activity array with the child of this message
765 * @param string $relay_actor Relay actor
766 * @return string fetched message URL
767 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
769 public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
771 if (!empty($child['receiver'])) {
772 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
777 $object = ActivityPub::fetchContent($url, $uid);
778 if (empty($object)) {
779 Logger::notice('Activity was not fetchable, aborting.', ['url' => $url]);
783 if (empty($object['id'])) {
784 Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
788 if (!empty($object['actor'])) {
789 $object_actor = $object['actor'];
790 } elseif (!empty($object['attributedTo'])) {
791 $object_actor = $object['attributedTo'];
792 if (is_array($object_actor)) {
793 $compacted = JsonLD::compact($object);
794 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
801 $signer = [$object_actor];
803 if (!empty($child['author'])) {
804 $actor = $child['author'];
807 $actor = $object_actor;
810 if (!empty($object['published'])) {
811 $published = $object['published'];
812 } elseif (!empty($child['published'])) {
813 $published = $child['published'];
815 $published = DateTimeFormat::utcNow();
819 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
820 unset($object['@context']);
821 $activity['id'] = $object['id'];
822 $activity['to'] = $object['to'] ?? [];
823 $activity['cc'] = $object['cc'] ?? [];
824 $activity['actor'] = $actor;
825 $activity['object'] = $object;
826 $activity['published'] = $published;
827 $activity['type'] = 'Create';
829 $ldactivity = JsonLD::compact($activity);
831 if (!empty($relay_actor)) {
832 $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
833 } elseif (!empty($child['thread-completion'])) {
834 $ldactivity['thread-completion'] = $child['thread-completion'];
836 $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
839 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
843 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
845 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
847 return $activity['id'];
851 * Test if incoming relay messages should be accepted
853 * @param array $activity activity array
854 * @param string $id object ID
855 * @return boolean true if message is accepted
857 private static function acceptIncomingMessage(array $activity, string $id)
859 if (empty($activity['as:object'])) {
860 Logger::info('No object field in activity - accepted', ['id' => $id]);
864 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
865 $uriid = ItemURI::getIdByURI($replyto);
866 if (Post::exists(['uri-id' => $uriid])) {
867 Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
871 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
872 $authorid = Contact::getIdForURL($attributed_to);
874 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
877 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
879 foreach ($tags as $tag) {
880 if ($tag['type'] != 'Hashtag') {
883 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
887 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
891 * perform a "follow" request
893 * @param array $activity
894 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
895 * @throws \ImagickException
897 public static function followUser($activity)
899 $uid = User::getIdForURL($activity['object_id']);
904 $owner = User::getOwnerDataById($uid);
909 $cid = Contact::getIdForURL($activity['actor'], $uid);
911 self::switchContact($cid);
912 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
915 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
916 'author-link' => $activity['actor']];
918 // Ensure that the contact has got the right network type
919 self::switchContact($item['author-id']);
921 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
922 if ($result === true) {
923 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
926 $cid = Contact::getIdForURL($activity['actor'], $uid);
931 if (empty($contact)) {
932 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
935 Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
939 * Update the given profile
941 * @param array $activity
944 public static function updatePerson($activity)
946 if (empty($activity['object_id'])) {
950 Logger::info('Updating profile', ['object' => $activity['object_id']]);
951 Contact::updateFromProbeByURL($activity['object_id']);
955 * Delete the given profile
957 * @param array $activity
958 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
960 public static function deletePerson($activity)
962 if (empty($activity['object_id']) || empty($activity['actor'])) {
963 Logger::info('Empty object id or actor.');
967 if ($activity['object_id'] != $activity['actor']) {
968 Logger::info('Object id does not match actor.');
972 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
973 while ($contact = DBA::fetch($contacts)) {
974 Contact::remove($contact['id']);
976 DBA::close($contacts);
978 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
982 * Accept a follow request
984 * @param array $activity
985 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
986 * @throws \ImagickException
988 public static function acceptFollowUser($activity)
990 $uid = User::getIdForURL($activity['object_actor']);
995 $cid = Contact::getIdForURL($activity['actor'], $uid);
997 Logger::info('No contact found', ['actor' => $activity['actor']]);
1001 self::switchContact($cid);
1003 $fields = ['pending' => false];
1005 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1006 if ($contact['rel'] == Contact::FOLLOWER) {
1007 $fields['rel'] = Contact::FRIEND;
1010 $condition = ['id' => $cid];
1011 DBA::update('contact', $fields, $condition);
1012 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1016 * Reject a follow request
1018 * @param array $activity
1019 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1020 * @throws \ImagickException
1022 public static function rejectFollowUser($activity)
1024 $uid = User::getIdForURL($activity['object_actor']);
1029 $cid = Contact::getIdForURL($activity['actor'], $uid);
1031 Logger::info('No contact found', ['actor' => $activity['actor']]);
1035 self::switchContact($cid);
1037 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1038 Contact::remove($cid);
1039 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1041 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1046 * Undo activity like "like" or "dislike"
1048 * @param array $activity
1049 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1050 * @throws \ImagickException
1052 public static function undoActivity($activity)
1054 if (empty($activity['object_id'])) {
1058 if (empty($activity['object_actor'])) {
1062 $author_id = Contact::getIdForURL($activity['object_actor']);
1063 if (empty($author_id)) {
1067 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1071 * Activity to remove a follower
1073 * @param array $activity
1074 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1075 * @throws \ImagickException
1077 public static function undoFollowUser($activity)
1079 $uid = User::getIdForURL($activity['object_object']);
1084 $owner = User::getOwnerDataById($uid);
1085 if (empty($owner)) {
1089 $cid = Contact::getIdForURL($activity['actor'], $uid);
1091 Logger::info('No contact found', ['actor' => $activity['actor']]);
1095 self::switchContact($cid);
1097 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1098 if (!DBA::isResult($contact)) {
1102 Contact::removeFollower($owner, $contact);
1103 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1107 * Switches a contact to AP if needed
1109 * @param integer $cid Contact ID
1110 * @throws \Exception
1112 private static function switchContact($cid)
1114 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1115 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1119 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1120 Contact::updateFromProbe($cid);
1124 * Collects implicit mentions like:
1125 * - the author of the parent item
1126 * - all the mentioned conversants in the parent item
1128 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1130 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1132 private static function getImplicitMentionList(array $parent)
1134 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1136 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1138 $implicit_mentions = [];
1139 if (empty($parent_author['url'])) {
1140 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1142 $implicit_mentions[] = $parent_author['url'];
1143 $implicit_mentions[] = $parent_author['nurl'];
1144 $implicit_mentions[] = $parent_author['alias'];
1147 if (!empty($parent['alias'])) {
1148 $implicit_mentions[] = $parent['alias'];
1151 foreach ($parent_terms as $term) {
1152 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1153 if (!empty($contact['url'])) {
1154 $implicit_mentions[] = $contact['url'];
1155 $implicit_mentions[] = $contact['nurl'];
1156 $implicit_mentions[] = $contact['alias'];
1160 return $implicit_mentions;
1164 * Strips from the body prepended implicit mentions
1166 * @param string $body
1167 * @param array $parent
1170 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1172 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1176 $potential_mentions = self::getImplicitMentionList($parent);
1178 $kept_mentions = [];
1180 // Extract one prepended mention at a time from the body
1181 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1182 if (!in_array($matches[2], $potential_mentions)) {
1183 $kept_mentions[] = $matches[1];
1186 $body = $matches[3];
1189 // Re-appending the kept mentions to the body after extraction
1190 $kept_mentions[] = $body;
1192 return implode('', $kept_mentions);