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\Tag;
39 use Friendica\Model\User;
40 use Friendica\Model\Post;
41 use Friendica\Protocol\Activity;
42 use Friendica\Protocol\ActivityPub;
43 use Friendica\Protocol\Relay;
44 use Friendica\Util\DateTimeFormat;
45 use Friendica\Util\JsonLD;
46 use Friendica\Util\Strings;
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 * Store attached media files in the post-media table
89 * @param array $attachment
92 private static function storeAttachmentAsMedia(int $uriid, array $attachment)
94 if (empty($attachment['url'])) {
98 $data = ['uri-id' => $uriid];
100 $filetype = strtolower(substr($attachment['mediaType'], 0, strpos($attachment['mediaType'], '/')));
101 if ($filetype == 'image') {
102 $data['type'] = Post\Media::IMAGE;
103 } elseif ($filetype == 'video') {
104 $data['type'] = Post\Media::VIDEO;
105 } elseif ($filetype == 'audio') {
106 $data['type'] = Post\Media::AUDIO;
107 } elseif (in_array($attachment['mediaType'], ['application/x-bittorrent', 'application/x-bittorrent;x-scheme-handler/magnet'])) {
108 $data['type'] = Post\Media::TORRENT;
110 Logger::info('Unknown type', ['attachment' => $attachment]);
114 $data['url'] = $attachment['url'];
115 $data['mimetype'] = $attachment['mediaType'];
116 $data['height'] = $attachment['height'] ?? null;
117 $data['size'] = $attachment['size'] ?? null;
118 $data['preview'] = $attachment['image'] ?? null;
119 $data['description'] = $attachment['name'] ?? null;
121 Post\Media::insert($data);
125 * Add attachment data to the item array
127 * @param array $activity
130 * @return array array
132 private static function constructAttachList($activity, $item)
134 if (empty($activity['attachments'])) {
138 $item['attach'] = '';
140 foreach ($activity['attachments'] as $attach) {
141 switch ($attach['type']) {
144 'url' => $attach['url'],
145 'type' => $attach['type'],
146 'title' => $attach['title'] ?? '',
147 'text' => $attach['desc'] ?? '',
148 'image' => $attach['image'] ?? '',
152 $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
155 self::storeAttachmentAsMedia($item['uri-id'], $attach);
157 $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
158 if ($filetype == 'image') {
159 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
163 $item['body'] .= "\n";
165 // image is the preview/thumbnail URL
166 if (!empty($attach['image'])) {
167 $item['body'] .= '[url=' . $attach['url'] . ']';
168 $attach['url'] = $attach['image'];
171 if (empty($attach['name'])) {
172 $item['body'] .= '[img]' . $attach['url'] . '[/img]';
174 $item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
177 if (!empty($attach['image'])) {
178 $item['body'] .= '[/url]';
180 } elseif ($filetype == 'audio') {
181 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
185 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
186 } elseif ($filetype == 'video') {
187 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
191 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
193 if (!empty($item['attach'])) {
194 $item['attach'] .= ',';
196 $item['attach'] = '';
199 $item['attach'] .= Post\Media::getAttachElement($attach['url'],
200 $attach['length'] ?? 0, $attach['mediaType'], $attach['name'] ?? '');
211 * @param array $activity Activity array
212 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
214 public static function updateItem($activity)
216 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
217 if (!DBA::isResult($item)) {
218 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
219 $item = self::createItem($activity);
220 self::postItem($activity, $item);
224 $item['changed'] = DateTimeFormat::utcNow();
225 $item['edited'] = DateTimeFormat::utc($activity['updated']);
227 $item = self::processContent($activity, $item);
229 $item = self::constructAttachList($activity, $item);
235 Item::update($item, ['uri' => $activity['id']]);
239 * Prepares data for a message
241 * @param array $activity Activity array
242 * @return array Internal item
243 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
244 * @throws \ImagickException
246 public static function createItem($activity)
249 $item['verb'] = Activity::POST;
250 $item['thr-parent'] = $activity['reply-to-id'];
252 if ($activity['reply-to-id'] == $activity['id']) {
253 $item['gravity'] = GRAVITY_PARENT;
254 $item['object-type'] = Activity\ObjectType::NOTE;
256 $item['gravity'] = GRAVITY_COMMENT;
257 $item['object-type'] = Activity\ObjectType::COMMENT;
260 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
261 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
262 self::fetchMissingActivity($activity['reply-to-id'], $activity);
265 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
267 /// @todo What to do with $activity['context']?
268 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
269 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
273 $item['network'] = Protocol::ACTIVITYPUB;
274 $item['author-link'] = $activity['author'];
275 $item['author-id'] = Contact::getIdForURL($activity['author']);
276 $item['owner-link'] = $activity['actor'];
277 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
279 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
280 $item['private'] = Item::UNLISTED;
281 } elseif (in_array(0, $activity['receiver'])) {
282 $item['private'] = Item::PUBLIC;
284 $item['private'] = Item::PRIVATE;
287 if (!empty($activity['raw'])) {
288 $item['source'] = $activity['raw'];
289 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
290 $item['conversation-href'] = $activity['context'] ?? '';
291 $item['conversation-uri'] = $activity['conversation'] ?? '';
293 if (isset($activity['push'])) {
294 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
298 $item['isForum'] = false;
300 if (!empty($activity['thread-completion'])) {
301 if ($activity['thread-completion'] != $item['owner-id']) {
302 $actor = Contact::getById($activity['thread-completion'], ['url']);
303 $item['causer-link'] = $actor['url'];
304 $item['causer-id'] = $activity['thread-completion'];
305 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
307 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
308 $item['causer-link'] = $item['owner-link'];
309 $item['causer-id'] = $item['owner-id'];
310 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
313 $item['owner-link'] = $item['author-link'];
314 $item['owner-id'] = $item['author-id'];
316 $actor = APContact::getByURL($item['owner-link'], false);
317 $item['isForum'] = ($actor['type'] == 'Group');
320 $item['uri'] = $activity['id'];
322 $item['created'] = DateTimeFormat::utc($activity['published']);
323 $item['edited'] = DateTimeFormat::utc($activity['updated']);
324 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
325 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
327 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
329 $item = self::processContent($activity, $item);
331 Logger::info('Message was not processed');
335 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
337 $item = self::constructAttachList($activity, $item);
345 * @param array $activity
346 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
347 * @throws \ImagickException
349 public static function deleteItem($activity)
351 $owner = Contact::getIdForURL($activity['actor']);
353 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
354 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
358 * Prepare the item array for an activity
360 * @param array $activity Activity array
361 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
362 * @throws \ImagickException
364 public static function addTag($activity)
366 if (empty($activity['object_content']) || empty($activity['object_id'])) {
370 foreach ($activity['receiver'] as $receiver) {
371 $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
372 if (!DBA::isResult($item)) {
373 // We don't fetch missing content for this purpose
377 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
378 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
382 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
383 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
388 * Prepare the item array for an activity
390 * @param array $activity Activity array
391 * @param string $verb Activity verb
392 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
393 * @throws \ImagickException
395 public static function createActivity($activity, $verb)
397 $item = self::createItem($activity);
398 $item['verb'] = $verb;
399 $item['thr-parent'] = $activity['object_id'];
400 $item['gravity'] = GRAVITY_ACTIVITY;
401 $item['object-type'] = Activity\ObjectType::NOTE;
403 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
405 self::postItem($activity, $item);
411 * @param array $activity Activity array
415 public static function createEvent($activity, $item)
417 $event['summary'] = HTML::toBBCode($activity['name']);
418 $event['desc'] = HTML::toBBCode($activity['content']);
419 $event['start'] = $activity['start-time'];
420 $event['finish'] = $activity['end-time'];
421 $event['nofinish'] = empty($event['finish']);
422 $event['location'] = $activity['location'];
423 $event['adjust'] = true;
424 $event['cid'] = $item['contact-id'];
425 $event['uid'] = $item['uid'];
426 $event['uri'] = $item['uri'];
427 $event['edited'] = $item['edited'];
428 $event['private'] = $item['private'];
429 $event['guid'] = $item['guid'];
430 $event['plink'] = $item['plink'];
432 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
433 $ev = DBA::selectFirst('event', ['id'], $condition);
434 if (DBA::isResult($ev)) {
435 $event['id'] = $ev['id'];
438 $event_id = Event::store($event);
439 Logger::info('Event was stored', ['id' => $event_id]);
443 * Process the content
445 * @param array $activity Activity array
447 * @return array|bool Returns the item array or false if there was an unexpected occurrence
450 private static function processContent($activity, $item)
452 $item['title'] = HTML::toBBCode($activity['name']);
454 $content = HTML::toBBCode($activity['content']);
456 if (!empty($activity['emojis'])) {
457 $content = self::replaceEmojis($content, $activity['emojis']);
460 $content = self::convertMentions($content);
462 if (!empty($activity['source'])) {
463 $item['body'] = $activity['source'];
464 $item['raw-body'] = $content;
466 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
467 $item_private = !in_array(0, $activity['item_receiver']);
468 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
469 if (!DBA::isResult($parent)) {
470 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
473 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
474 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
478 $content = self::removeImplicitMentionsFromBody($content, $parent);
480 $item['content-warning'] = HTML::toBBCode($activity['summary']);
481 $item['raw-body'] = $item['body'] = $content;
484 self::storeFromBody($item);
485 self::storeTags($item['uri-id'], $activity['tags']);
487 $item['location'] = $activity['location'];
489 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
490 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
493 $item['app'] = $activity['generator'];
499 * Store hashtags and mentions
503 private static function storeFromBody(array $item)
505 // Make sure to delete all existing tags (can happen when called via the update functionality)
506 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
508 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
512 * Generate a GUID out of an URL
514 * @param string $url message URL
515 * @return string with GUID
517 private static function getGUIDByURL(string $url)
519 $parsed = parse_url($url);
521 $host_hash = hash('crc32', $parsed['host']);
523 unset($parsed["scheme"]);
524 unset($parsed["host"]);
526 $path = implode("/", $parsed);
528 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
532 * Creates an item post
534 * @param array $activity Activity data
535 * @param array $item item array
536 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
537 * @throws \ImagickException
539 public static function postItem(array $activity, array $item)
546 ksort($activity['receiver']);
548 foreach ($activity['receiver'] as $receiver) {
549 if ($receiver == -1) {
553 $item['uid'] = $receiver;
555 $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
557 case Receiver::TARGET_TO:
558 $item['post-type'] = Item::PT_TO;
560 case Receiver::TARGET_CC:
561 $item['post-type'] = Item::PT_CC;
563 case Receiver::TARGET_BTO:
564 $item['post-type'] = Item::PT_BTO;
566 case Receiver::TARGET_BCC:
567 $item['post-type'] = Item::PT_BCC;
569 case Receiver::TARGET_FOLLOWER:
570 $item['post-type'] = Item::PT_FOLLOWER;
572 case Receiver::TARGET_ANSWER:
573 $item['post-type'] = Item::PT_COMMENT;
575 case Receiver::TARGET_GLOBAL:
576 $item['post-type'] = Item::PT_GLOBAL;
579 $item['post-type'] = Item::PT_ARTICLE;
582 if (!empty($activity['from-relay'])) {
583 $item['post-type'] = Item::PT_RELAY;
584 } elseif (!empty($activity['thread-completion'])) {
585 $item['post-type'] = Item::PT_FETCHED;
588 if ($item['isForum'] ?? false) {
589 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
591 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
594 if (($receiver != 0) && empty($item['contact-id'])) {
595 $item['contact-id'] = Contact::getIdForURL($activity['author']);
598 if (!empty($activity['directmessage'])) {
599 self::postMail($activity, $item);
603 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
604 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
606 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
607 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
611 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
615 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
618 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
619 self::createEvent($activity, $item);
622 $item_id = Item::insert($item);
624 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
626 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
629 if ($item['uid'] == 0) {
634 // Store send a follow request for every reshare - but only when the item had been stored
635 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
636 $author = APContact::getByURL($item['owner-link'], false);
637 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
638 if ($author['type'] != 'Group') {
639 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
640 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
646 * Store tags and mentions into the tag table
648 * @param integer $uriid
651 private static function storeTags(int $uriid, array $tags = null)
653 foreach ($tags as $tag) {
654 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
658 $hash = substr($tag['name'], 0, 1);
660 if ($tag['type'] == 'Mention') {
661 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
662 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
663 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
664 $tag['name'] = substr($tag['name'], 1);
666 $type = Tag::IMPLICIT_MENTION;
668 if (!empty($tag['href'])) {
669 $apcontact = APContact::getByURL($tag['href']);
670 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
671 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
674 } elseif ($tag['type'] == 'Hashtag') {
675 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
676 $tag['name'] = substr($tag['name'], 1);
678 $type = Tag::HASHTAG;
681 if (empty($tag['name'])) {
685 Tag::store($uriid, $type, $tag['name'], $tag['href']);
690 * Creates an mail post
692 * @param array $activity Activity data
693 * @param array $item item array
694 * @return int|bool New mail table row id or false on error
695 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
697 private static function postMail($activity, $item)
699 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
700 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
704 Logger::info('Direct Message', $item);
707 $msg['uid'] = $item['uid'];
709 $msg['contact-id'] = $item['contact-id'];
711 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
712 $msg['from-name'] = $contact['name'];
713 $msg['from-url'] = $contact['url'];
714 $msg['from-photo'] = $contact['photo'];
716 $msg['uri'] = $item['uri'];
717 $msg['created'] = $item['created'];
719 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
720 if (DBA::isResult($parent)) {
721 $msg['parent-uri'] = $parent['parent-uri'];
722 $msg['title'] = $parent['title'];
724 $msg['parent-uri'] = $item['thr-parent'];
726 if (!empty($item['title'])) {
727 $msg['title'] = $item['title'];
728 } elseif (!empty($item['content-warning'])) {
729 $msg['title'] = $item['content-warning'];
731 // Trying to generate a title out of the body
732 $title = $item['body'];
734 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
735 $title = $matches[3];
738 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
740 if (strlen($title) > 20) {
741 $title = substr($title, 0, 20) . '...';
744 $msg['title'] = $title;
747 $msg['body'] = $item['body'];
749 return Mail::insert($msg);
753 * Fetches missing posts
755 * @param string $url message URL
756 * @param array $child activity array with the child of this message
757 * @param string $relay_actor Relay actor
758 * @return string fetched message URL
759 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
761 public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
763 if (!empty($child['receiver'])) {
764 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
769 $object = ActivityPub::fetchContent($url, $uid);
770 if (empty($object)) {
771 Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
775 if (empty($object['id'])) {
776 Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
780 if (!empty($object['actor'])) {
781 $object_actor = $object['actor'];
782 } elseif (!empty($object['attributedTo'])) {
783 $object_actor = $object['attributedTo'];
789 $signer = [$object_actor];
791 if (!empty($child['author'])) {
792 $actor = $child['author'];
795 $actor = $object_actor;
798 if (!empty($object['published'])) {
799 $published = $object['published'];
800 } elseif (!empty($child['published'])) {
801 $published = $child['published'];
803 $published = DateTimeFormat::utcNow();
807 $activity['@context'] = $object['@context'];
808 unset($object['@context']);
809 $activity['id'] = $object['id'];
810 $activity['to'] = $object['to'] ?? [];
811 $activity['cc'] = $object['cc'] ?? [];
812 $activity['actor'] = $actor;
813 $activity['object'] = $object;
814 $activity['published'] = $published;
815 $activity['type'] = 'Create';
817 $ldactivity = JsonLD::compact($activity);
819 if (!empty($relay_actor)) {
820 $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
821 } elseif (!empty($child['thread-completion'])) {
822 $ldactivity['thread-completion'] = $child['thread-completion'];
824 $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
827 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
831 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
833 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
835 return $activity['id'];
839 * Test if incoming relay messages should be accepted
841 * @param array $activity activity array
842 * @param string $id object ID
843 * @return boolean true if message is accepted
845 private static function acceptIncomingMessage(array $activity, string $id)
847 if (empty($activity['as:object'])) {
848 Logger::info('No object field in activity - accepted', ['id' => $id]);
852 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
853 if (Item::exists(['uri' => $replyto])) {
854 Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'replyto' => $replyto]);
858 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
859 $authorid = Contact::getIdForURL($attributed_to);
861 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
864 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
866 foreach ($tags as $tag) {
867 if ($tag['type'] != 'Hashtag') {
870 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
874 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
878 * perform a "follow" request
880 * @param array $activity
881 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
882 * @throws \ImagickException
884 public static function followUser($activity)
886 $uid = User::getIdForURL($activity['object_id']);
891 $owner = User::getOwnerDataById($uid);
896 $cid = Contact::getIdForURL($activity['actor'], $uid);
898 self::switchContact($cid);
899 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
900 $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
905 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
906 'author-link' => $activity['actor']];
908 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
910 // Ensure that the contact has got the right network type
911 self::switchContact($item['author-id']);
913 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
914 if ($result === true) {
915 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
918 $cid = Contact::getIdForURL($activity['actor'], $uid);
923 if (empty($contact)) {
924 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
927 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
931 * Update the given profile
933 * @param array $activity
936 public static function updatePerson($activity)
938 if (empty($activity['object_id'])) {
942 Logger::info('Updating profile', ['object' => $activity['object_id']]);
943 Contact::updateFromProbeByURL($activity['object_id']);
947 * Delete the given profile
949 * @param array $activity
950 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
952 public static function deletePerson($activity)
954 if (empty($activity['object_id']) || empty($activity['actor'])) {
955 Logger::info('Empty object id or actor.');
959 if ($activity['object_id'] != $activity['actor']) {
960 Logger::info('Object id does not match actor.');
964 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
965 while ($contact = DBA::fetch($contacts)) {
966 Contact::remove($contact['id']);
968 DBA::close($contacts);
970 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
974 * Accept a follow request
976 * @param array $activity
977 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
978 * @throws \ImagickException
980 public static function acceptFollowUser($activity)
982 $uid = User::getIdForURL($activity['object_actor']);
987 $cid = Contact::getIdForURL($activity['actor'], $uid);
989 Logger::info('No contact found', ['actor' => $activity['actor']]);
993 self::switchContact($cid);
995 $fields = ['pending' => false];
997 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
998 if ($contact['rel'] == Contact::FOLLOWER) {
999 $fields['rel'] = Contact::FRIEND;
1002 $condition = ['id' => $cid];
1003 DBA::update('contact', $fields, $condition);
1004 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1008 * Reject a follow request
1010 * @param array $activity
1011 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1012 * @throws \ImagickException
1014 public static function rejectFollowUser($activity)
1016 $uid = User::getIdForURL($activity['object_actor']);
1021 $cid = Contact::getIdForURL($activity['actor'], $uid);
1023 Logger::info('No contact found', ['actor' => $activity['actor']]);
1027 self::switchContact($cid);
1029 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1030 Contact::remove($cid);
1031 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1033 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1038 * Undo activity like "like" or "dislike"
1040 * @param array $activity
1041 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1042 * @throws \ImagickException
1044 public static function undoActivity($activity)
1046 if (empty($activity['object_id'])) {
1050 if (empty($activity['object_actor'])) {
1054 $author_id = Contact::getIdForURL($activity['object_actor']);
1055 if (empty($author_id)) {
1059 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1063 * Activity to remove a follower
1065 * @param array $activity
1066 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1067 * @throws \ImagickException
1069 public static function undoFollowUser($activity)
1071 $uid = User::getIdForURL($activity['object_object']);
1076 $owner = User::getOwnerDataById($uid);
1077 if (empty($owner)) {
1081 $cid = Contact::getIdForURL($activity['actor'], $uid);
1083 Logger::info('No contact found', ['actor' => $activity['actor']]);
1087 self::switchContact($cid);
1089 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1090 if (!DBA::isResult($contact)) {
1094 Contact::removeFollower($owner, $contact);
1095 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1099 * Switches a contact to AP if needed
1101 * @param integer $cid Contact ID
1102 * @throws \Exception
1104 private static function switchContact($cid)
1106 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1107 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1111 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1112 Contact::updateFromProbe($cid);
1116 * Collects implicit mentions like:
1117 * - the author of the parent item
1118 * - all the mentioned conversants in the parent item
1120 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1122 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1124 private static function getImplicitMentionList(array $parent)
1126 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1128 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1130 $implicit_mentions = [];
1131 if (empty($parent_author['url'])) {
1132 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
1134 $implicit_mentions[] = $parent_author['url'];
1135 $implicit_mentions[] = $parent_author['nurl'];
1136 $implicit_mentions[] = $parent_author['alias'];
1139 if (!empty($parent['alias'])) {
1140 $implicit_mentions[] = $parent['alias'];
1143 foreach ($parent_terms as $term) {
1144 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1145 if (!empty($contact['url'])) {
1146 $implicit_mentions[] = $contact['url'];
1147 $implicit_mentions[] = $contact['nurl'];
1148 $implicit_mentions[] = $contact['alias'];
1152 return $implicit_mentions;
1156 * Strips from the body prepended implicit mentions
1158 * @param string $body
1159 * @param array $parent
1162 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1164 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1168 $potential_mentions = self::getImplicitMentionList($parent);
1170 $kept_mentions = [];
1172 // Extract one prepended mention at a time from the body
1173 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1174 if (!in_array($matches[2], $potential_mentions)) {
1175 $kept_mentions[] = $matches[1];
1178 $body = $matches[3];
1181 // Re-appending the kept mentions to the body after extraction
1182 $kept_mentions[] = $body;
1184 return implode('', $kept_mentions);