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\Core\System;
30 use Friendica\Database\DBA;
32 use Friendica\Model\APContact;
33 use Friendica\Model\Contact;
34 use Friendica\Model\Conversation;
35 use Friendica\Model\Event;
36 use Friendica\Model\GServer;
37 use Friendica\Model\Item;
38 use Friendica\Model\ItemURI;
39 use Friendica\Model\Mail;
40 use Friendica\Model\Tag;
41 use Friendica\Model\User;
42 use Friendica\Model\Post;
43 use Friendica\Protocol\Activity;
44 use Friendica\Protocol\ActivityPub;
45 use Friendica\Protocol\Relay;
46 use Friendica\Util\DateTimeFormat;
47 use Friendica\Util\JsonLD;
48 use Friendica\Util\Strings;
51 * ActivityPub Processor Protocol class
56 * Converts mentions from Pleroma into the Friendica format
60 * @return string converted body
62 private static function convertMentions($body)
64 $URLSearchString = "^\[\]";
65 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
71 * Convert the language array into a language JSON
73 * @param array $languages
74 * @return string language JSON
76 private static function processLanguages(array $languages)
78 $codes = array_keys($languages);
80 foreach ($codes as $code) {
88 return json_encode($lang);
91 * Replaces emojis in the body
93 * @param array $emojis
96 * @return string with replaced emojis
98 private static function replaceEmojis($body, array $emojis)
102 array_column($emojis, 'name'),
103 array_map(function ($emoji) {
104 return '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
113 * Store attached media files in the post-media table
116 * @param array $attachment
119 private static function storeAttachmentAsMedia(int $uriid, array $attachment)
121 if (empty($attachment['url'])) {
125 $data = ['uri-id' => $uriid];
126 $data['type'] = Post\Media::UNKNOWN;
127 $data['url'] = $attachment['url'];
128 $data['mimetype'] = $attachment['mediaType'];
129 $data['height'] = $attachment['height'] ?? null;
130 $data['width'] = $attachment['width'] ?? null;
131 $data['size'] = $attachment['size'] ?? null;
132 $data['preview'] = $attachment['image'] ?? null;
133 $data['description'] = $attachment['name'] ?? null;
135 Post\Media::insert($data);
139 * Stire attachment data
141 * @param array $activity
144 private static function storeAttachments($activity, $item)
146 if (empty($activity['attachments'])) {
150 foreach ($activity['attachments'] as $attach) {
151 self::storeAttachmentAsMedia($item['uri-id'], $attach);
158 * @param array $activity Activity array
159 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
161 public static function updateItem($activity)
163 $item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity', 'post-type'], ['uri' => $activity['id']]);
164 if (!DBA::isResult($item)) {
165 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
166 $item = self::createItem($activity);
167 self::postItem($activity, $item);
171 $item['changed'] = DateTimeFormat::utcNow();
172 $item['edited'] = DateTimeFormat::utc($activity['updated']);
174 $item = self::processContent($activity, $item);
176 self::storeAttachments($activity, $item);
182 Item::update($item, ['uri' => $activity['id']]);
186 * Prepares data for a message
188 * @param array $activity Activity array
189 * @return array Internal item
190 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
191 * @throws \ImagickException
193 public static function createItem($activity)
196 $item['verb'] = Activity::POST;
197 $item['thr-parent'] = $activity['reply-to-id'];
199 if ($activity['reply-to-id'] == $activity['id']) {
200 $item['gravity'] = GRAVITY_PARENT;
201 $item['object-type'] = Activity\ObjectType::NOTE;
203 $item['gravity'] = GRAVITY_COMMENT;
204 $item['object-type'] = Activity\ObjectType::COMMENT;
207 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
208 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
209 self::fetchMissingActivity($activity['reply-to-id'], $activity);
212 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
214 /// @todo What to do with $activity['context']?
215 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
216 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
220 $item['network'] = Protocol::ACTIVITYPUB;
221 $item['author-link'] = $activity['author'];
222 $item['author-id'] = Contact::getIdForURL($activity['author']);
223 $item['owner-link'] = $activity['actor'];
224 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
226 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
227 $item['private'] = Item::UNLISTED;
228 } elseif (in_array(0, $activity['receiver'])) {
229 $item['private'] = Item::PUBLIC;
231 $item['private'] = Item::PRIVATE;
234 if (!empty($activity['raw'])) {
235 $item['source'] = $activity['raw'];
236 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
237 $item['conversation-href'] = $activity['context'] ?? '';
238 $item['conversation-uri'] = $activity['conversation'] ?? '';
240 if (isset($activity['push'])) {
241 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
245 if (!empty($activity['from-relay'])) {
246 $item['direction'] = Conversation::RELAY;
249 if ($activity['object_type'] == 'as:Article') {
250 $item['post-type'] = Item::PT_ARTICLE;
251 } elseif ($activity['object_type'] == 'as:Audio') {
252 $item['post-type'] = Item::PT_AUDIO;
253 } elseif ($activity['object_type'] == 'as:Document') {
254 $item['post-type'] = Item::PT_DOCUMENT;
255 } elseif ($activity['object_type'] == 'as:Event') {
256 $item['post-type'] = Item::PT_EVENT;
257 } elseif ($activity['object_type'] == 'as:Image') {
258 $item['post-type'] = Item::PT_IMAGE;
259 } elseif ($activity['object_type'] == 'as:Page') {
260 $item['post-type'] = Item::PT_PAGE;
261 } elseif ($activity['object_type'] == 'as:Video') {
262 $item['post-type'] = Item::PT_VIDEO;
264 $item['post-type'] = Item::PT_NOTE;
267 $item['isForum'] = false;
269 if (!empty($activity['thread-completion'])) {
270 if ($activity['thread-completion'] != $item['owner-id']) {
271 $actor = Contact::getById($activity['thread-completion'], ['url']);
272 $item['causer-link'] = $actor['url'];
273 $item['causer-id'] = $activity['thread-completion'];
274 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
276 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
277 $item['causer-link'] = $item['owner-link'];
278 $item['causer-id'] = $item['owner-id'];
279 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
282 $item['owner-link'] = $item['author-link'];
283 $item['owner-id'] = $item['author-id'];
285 $actor = APContact::getByURL($item['owner-link'], false);
286 $item['isForum'] = ($actor['type'] == 'Group');
289 $item['uri'] = $activity['id'];
291 $item['created'] = DateTimeFormat::utc($activity['published']);
292 $item['edited'] = DateTimeFormat::utc($activity['updated']);
293 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
294 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
296 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
297 if (empty($item['uri-id'])) {
298 Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
302 $item = self::processContent($activity, $item);
304 Logger::info('Message was not processed');
308 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
310 self::storeAttachments($activity, $item);
312 // We received the post via AP, so we set the protocol of the server to AP
313 $contact = Contact::getById($item['author-id'], ['gsid']);
314 if (!empty($contact['gsid'])) {
315 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
318 if ($item['author-id'] != $item['owner-id']) {
319 $contact = Contact::getById($item['owner-id'], ['gsid']);
320 if (!empty($contact['gsid'])) {
321 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
331 * @param array $activity
332 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
333 * @throws \ImagickException
335 public static function deleteItem($activity)
337 $owner = Contact::getIdForURL($activity['actor']);
339 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
340 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
344 * Prepare the item array for an activity
346 * @param array $activity Activity array
347 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
348 * @throws \ImagickException
350 public static function addTag($activity)
352 if (empty($activity['object_content']) || empty($activity['object_id'])) {
356 foreach ($activity['receiver'] as $receiver) {
357 $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
358 if (!DBA::isResult($item)) {
359 // We don't fetch missing content for this purpose
363 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
364 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
368 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
369 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
374 * Prepare the item array for an activity
376 * @param array $activity Activity array
377 * @param string $verb Activity verb
378 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
379 * @throws \ImagickException
381 public static function createActivity($activity, $verb)
383 $item = self::createItem($activity);
384 $item['verb'] = $verb;
385 $item['thr-parent'] = $activity['object_id'];
386 $item['gravity'] = GRAVITY_ACTIVITY;
387 unset($item['post-type']);
388 $item['object-type'] = Activity\ObjectType::NOTE;
390 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
392 self::postItem($activity, $item);
398 * @param array $activity Activity array
402 public static function createEvent($activity, $item)
404 $event['summary'] = HTML::toBBCode($activity['name']);
405 $event['desc'] = HTML::toBBCode($activity['content']);
406 $event['start'] = $activity['start-time'];
407 $event['finish'] = $activity['end-time'];
408 $event['nofinish'] = empty($event['finish']);
409 $event['location'] = $activity['location'];
410 $event['adjust'] = $activity['adjust'] ?? true;
411 $event['cid'] = $item['contact-id'];
412 $event['uid'] = $item['uid'];
413 $event['uri'] = $item['uri'];
414 $event['edited'] = $item['edited'];
415 $event['private'] = $item['private'];
416 $event['guid'] = $item['guid'];
417 $event['plink'] = $item['plink'];
418 $event['network'] = $item['network'];
419 $event['protocol'] = $item['protocol'];
420 $event['direction'] = $item['direction'];
421 $event['source'] = $item['source'];
423 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
424 $ev = DBA::selectFirst('event', ['id'], $condition);
425 if (DBA::isResult($ev)) {
426 $event['id'] = $ev['id'];
429 $event_id = Event::store($event);
430 Logger::info('Event was stored', ['id' => $event_id]);
434 * Process the content
436 * @param array $activity Activity array
438 * @return array|bool Returns the item array or false if there was an unexpected occurrence
441 private static function processContent($activity, $item)
443 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
444 $item['title'] = Markdown::toBBCode($activity['name']);
445 $content = Markdown::toBBCode($activity['content']);
446 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
447 $item['title'] = $activity['name'];
448 $content = $activity['content'];
450 // By default assume "text/html"
451 $item['title'] = HTML::toBBCode($activity['name']);
452 $content = HTML::toBBCode($activity['content']);
455 if (!empty($activity['languages'])) {
456 $item['language'] = self::processLanguages($activity['languages']);
459 if (!empty($activity['emojis'])) {
460 $content = self::replaceEmojis($content, $activity['emojis']);
463 $content = self::convertMentions($content);
465 if (!empty($activity['source'])) {
466 $item['body'] = $activity['source'];
467 $item['raw-body'] = $content;
468 $item['body'] = Item::improveSharedDataInBody($item);
470 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
471 $item_private = !in_array(0, $activity['item_receiver']);
472 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
473 if (!DBA::isResult($parent)) {
474 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
477 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
478 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
482 $content = self::removeImplicitMentionsFromBody($content, $parent);
484 $item['content-warning'] = HTML::toBBCode($activity['summary']);
485 $item['raw-body'] = $item['body'] = $content;
488 self::storeFromBody($item);
489 self::storeTags($item['uri-id'], $activity['tags']);
491 $item['location'] = $activity['location'];
493 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
494 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
497 $item['app'] = $activity['generator'];
503 * Store hashtags and mentions
507 private static function storeFromBody(array $item)
509 // Make sure to delete all existing tags (can happen when called via the update functionality)
510 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
512 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
516 * Generate a GUID out of an URL
518 * @param string $url message URL
519 * @return string with GUID
521 private static function getGUIDByURL(string $url)
523 $parsed = parse_url($url);
525 $host_hash = hash('crc32', $parsed['host']);
527 unset($parsed["scheme"]);
528 unset($parsed["host"]);
530 $path = implode("/", $parsed);
532 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
536 * Creates an item post
538 * @param array $activity Activity data
539 * @param array $item item array
540 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
541 * @throws \ImagickException
543 public static function postItem(array $activity, array $item)
550 ksort($activity['receiver']);
552 foreach ($activity['receiver'] as $receiver) {
553 if ($receiver == -1) {
557 $item['uid'] = $receiver;
559 $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
561 case Receiver::TARGET_TO:
562 $item['post-reason'] = Item::PR_TO;
564 case Receiver::TARGET_CC:
565 $item['post-reason'] = Item::PR_CC;
567 case Receiver::TARGET_BTO:
568 $item['post-reason'] = Item::PR_BTO;
570 case Receiver::TARGET_BCC:
571 $item['post-reason'] = Item::PR_BCC;
573 case Receiver::TARGET_FOLLOWER:
574 $item['post-reason'] = Item::PR_FOLLOWER;
576 case Receiver::TARGET_ANSWER:
577 $item['post-reason'] = Item::PR_COMMENT;
579 case Receiver::TARGET_GLOBAL:
580 $item['post-reason'] = Item::PR_GLOBAL;
583 $item['post-reason'] = Item::PR_NONE;
586 if (!empty($activity['from-relay'])) {
587 $item['post-reason'] = Item::PR_RELAY;
588 } elseif (!empty($activity['thread-completion'])) {
589 $item['post-reason'] = Item::PR_FETCHED;
592 if ($item['isForum'] ?? false) {
593 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
595 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
598 if (($receiver != 0) && empty($item['contact-id'])) {
599 $item['contact-id'] = Contact::getIdForURL($activity['author']);
602 if (!empty($activity['directmessage'])) {
603 self::postMail($activity, $item);
607 if (!($item['isForum'] ?? false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT) &&
608 ($item['post-reason'] == Item::PR_BCC) && !Contact::isSharingByURL($activity['author'], $receiver)) {
609 Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id']]);
613 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
614 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
616 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
617 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
621 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
625 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
628 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
629 self::createEvent($activity, $item);
632 $item_id = Item::insert($item);
634 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
636 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
639 if ($item['uid'] == 0) {
644 // Store send a follow request for every reshare - but only when the item had been stored
645 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
646 $author = APContact::getByURL($item['owner-link'], false);
647 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
648 if ($author['type'] != 'Group') {
649 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
650 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
656 * Store tags and mentions into the tag table
658 * @param integer $uriid
661 private static function storeTags(int $uriid, array $tags = null)
663 foreach ($tags as $tag) {
664 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
668 $hash = substr($tag['name'], 0, 1);
670 if ($tag['type'] == 'Mention') {
671 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
672 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
673 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
674 $tag['name'] = substr($tag['name'], 1);
676 $type = Tag::IMPLICIT_MENTION;
678 if (!empty($tag['href'])) {
679 $apcontact = APContact::getByURL($tag['href']);
680 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
681 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
684 } elseif ($tag['type'] == 'Hashtag') {
685 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
686 $tag['name'] = substr($tag['name'], 1);
688 $type = Tag::HASHTAG;
691 if (empty($tag['name'])) {
695 Tag::store($uriid, $type, $tag['name'], $tag['href']);
700 * Creates an mail post
702 * @param array $activity Activity data
703 * @param array $item item array
704 * @return int|bool New mail table row id or false on error
705 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
707 private static function postMail($activity, $item)
709 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
710 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
714 Logger::info('Direct Message', $item);
717 $msg['uid'] = $item['uid'];
719 $msg['contact-id'] = $item['contact-id'];
721 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
722 $msg['from-name'] = $contact['name'];
723 $msg['from-url'] = $contact['url'];
724 $msg['from-photo'] = $contact['photo'];
726 $msg['uri'] = $item['uri'];
727 $msg['created'] = $item['created'];
729 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
730 if (DBA::isResult($parent)) {
731 $msg['parent-uri'] = $parent['parent-uri'];
732 $msg['title'] = $parent['title'];
734 $msg['parent-uri'] = $item['thr-parent'];
736 if (!empty($item['title'])) {
737 $msg['title'] = $item['title'];
738 } elseif (!empty($item['content-warning'])) {
739 $msg['title'] = $item['content-warning'];
741 // Trying to generate a title out of the body
742 $title = $item['body'];
744 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
745 $title = $matches[3];
748 $title = trim(BBCode::toPlaintext($title));
750 if (strlen($title) > 20) {
751 $title = substr($title, 0, 20) . '...';
754 $msg['title'] = $title;
757 $msg['body'] = $item['body'];
759 return Mail::insert($msg);
763 * Fetches missing posts
765 * @param string $url message URL
766 * @param array $child activity array with the child of this message
767 * @param string $relay_actor Relay actor
768 * @return string fetched message URL
769 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
771 public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
773 if (!empty($child['receiver'])) {
774 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
779 $object = ActivityPub::fetchContent($url, $uid);
780 if (empty($object)) {
781 Logger::notice('Activity was not fetchable, aborting.', ['url' => $url]);
785 if (empty($object['id'])) {
786 Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
790 if (!empty($object['actor'])) {
791 $object_actor = $object['actor'];
792 } elseif (!empty($object['attributedTo'])) {
793 $object_actor = $object['attributedTo'];
794 if (is_array($object_actor)) {
795 $compacted = JsonLD::compact($object);
796 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
803 $signer = [$object_actor];
805 if (!empty($child['author'])) {
806 $actor = $child['author'];
809 $actor = $object_actor;
812 if (!empty($object['published'])) {
813 $published = $object['published'];
814 } elseif (!empty($child['published'])) {
815 $published = $child['published'];
817 $published = DateTimeFormat::utcNow();
821 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
822 unset($object['@context']);
823 $activity['id'] = $object['id'];
824 $activity['to'] = $object['to'] ?? [];
825 $activity['cc'] = $object['cc'] ?? [];
826 $activity['actor'] = $actor;
827 $activity['object'] = $object;
828 $activity['published'] = $published;
829 $activity['type'] = 'Create';
831 $ldactivity = JsonLD::compact($activity);
833 if (!empty($relay_actor)) {
834 $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
835 } elseif (!empty($child['thread-completion'])) {
836 $ldactivity['thread-completion'] = $child['thread-completion'];
838 $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
841 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
845 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
847 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
849 return $activity['id'];
853 * Test if incoming relay messages should be accepted
855 * @param array $activity activity array
856 * @param string $id object ID
857 * @return boolean true if message is accepted
859 private static function acceptIncomingMessage(array $activity, string $id)
861 if (empty($activity['as:object'])) {
862 Logger::info('No object field in activity - accepted', ['id' => $id]);
866 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
867 $uriid = ItemURI::getIdByURI($replyto);
868 if (Post::exists(['uri-id' => $uriid])) {
869 Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
873 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
874 $authorid = Contact::getIdForURL($attributed_to);
876 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
879 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
881 foreach ($tags as $tag) {
882 if ($tag['type'] != 'Hashtag') {
885 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
889 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
893 * perform a "follow" request
895 * @param array $activity
896 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
897 * @throws \ImagickException
899 public static function followUser($activity)
901 $uid = User::getIdForURL($activity['object_id']);
906 $owner = User::getOwnerDataById($uid);
911 $cid = Contact::getIdForURL($activity['actor'], $uid);
913 self::switchContact($cid);
914 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
917 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
918 'author-link' => $activity['actor']];
920 // Ensure that the contact has got the right network type
921 self::switchContact($item['author-id']);
923 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
924 if ($result === true) {
925 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
928 $cid = Contact::getIdForURL($activity['actor'], $uid);
933 if (empty($contact)) {
934 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
937 Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
941 * Update the given profile
943 * @param array $activity
946 public static function updatePerson($activity)
948 if (empty($activity['object_id'])) {
952 Logger::info('Updating profile', ['object' => $activity['object_id']]);
953 Contact::updateFromProbeByURL($activity['object_id']);
957 * Delete the given profile
959 * @param array $activity
960 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
962 public static function deletePerson($activity)
964 if (empty($activity['object_id']) || empty($activity['actor'])) {
965 Logger::info('Empty object id or actor.');
969 if ($activity['object_id'] != $activity['actor']) {
970 Logger::info('Object id does not match actor.');
974 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
975 while ($contact = DBA::fetch($contacts)) {
976 Contact::remove($contact['id']);
978 DBA::close($contacts);
980 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
984 * Accept a follow request
986 * @param array $activity
987 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
988 * @throws \ImagickException
990 public static function acceptFollowUser($activity)
992 $uid = User::getIdForURL($activity['object_actor']);
997 $cid = Contact::getIdForURL($activity['actor'], $uid);
999 Logger::info('No contact found', ['actor' => $activity['actor']]);
1003 self::switchContact($cid);
1005 $fields = ['pending' => false];
1007 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1008 if ($contact['rel'] == Contact::FOLLOWER) {
1009 $fields['rel'] = Contact::FRIEND;
1012 $condition = ['id' => $cid];
1013 DBA::update('contact', $fields, $condition);
1014 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1018 * Reject a follow request
1020 * @param array $activity
1021 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1022 * @throws \ImagickException
1024 public static function rejectFollowUser($activity)
1026 $uid = User::getIdForURL($activity['object_actor']);
1031 $cid = Contact::getIdForURL($activity['actor'], $uid);
1033 Logger::info('No contact found', ['actor' => $activity['actor']]);
1037 self::switchContact($cid);
1039 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1040 Contact::remove($cid);
1041 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1043 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1048 * Undo activity like "like" or "dislike"
1050 * @param array $activity
1051 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1052 * @throws \ImagickException
1054 public static function undoActivity($activity)
1056 if (empty($activity['object_id'])) {
1060 if (empty($activity['object_actor'])) {
1064 $author_id = Contact::getIdForURL($activity['object_actor']);
1065 if (empty($author_id)) {
1069 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1073 * Activity to remove a follower
1075 * @param array $activity
1076 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1077 * @throws \ImagickException
1079 public static function undoFollowUser($activity)
1081 $uid = User::getIdForURL($activity['object_object']);
1086 $owner = User::getOwnerDataById($uid);
1087 if (empty($owner)) {
1091 $cid = Contact::getIdForURL($activity['actor'], $uid);
1093 Logger::info('No contact found', ['actor' => $activity['actor']]);
1097 self::switchContact($cid);
1099 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1100 if (!DBA::isResult($contact)) {
1104 Contact::removeFollower($owner, $contact);
1105 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1109 * Switches a contact to AP if needed
1111 * @param integer $cid Contact ID
1112 * @throws \Exception
1114 private static function switchContact($cid)
1116 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1117 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1121 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1122 Contact::updateFromProbe($cid);
1126 * Collects implicit mentions like:
1127 * - the author of the parent item
1128 * - all the mentioned conversants in the parent item
1130 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1132 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1134 private static function getImplicitMentionList(array $parent)
1136 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1138 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1140 $implicit_mentions = [];
1141 if (empty($parent_author['url'])) {
1142 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1144 $implicit_mentions[] = $parent_author['url'];
1145 $implicit_mentions[] = $parent_author['nurl'];
1146 $implicit_mentions[] = $parent_author['alias'];
1149 if (!empty($parent['alias'])) {
1150 $implicit_mentions[] = $parent['alias'];
1153 foreach ($parent_terms as $term) {
1154 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1155 if (!empty($contact['url'])) {
1156 $implicit_mentions[] = $contact['url'];
1157 $implicit_mentions[] = $contact['nurl'];
1158 $implicit_mentions[] = $contact['alias'];
1162 return $implicit_mentions;
1166 * Strips from the body prepended implicit mentions
1168 * @param string $body
1169 * @param array $parent
1172 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1174 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1178 $potential_mentions = self::getImplicitMentionList($parent);
1180 $kept_mentions = [];
1182 // Extract one prepended mention at a time from the body
1183 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1184 if (!in_array($matches[2], $potential_mentions)) {
1185 $kept_mentions[] = $matches[1];
1188 $body = $matches[3];
1191 // Re-appending the kept mentions to the body after extraction
1192 $kept_mentions[] = $body;
1194 return implode('', $kept_mentions);