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[friendica.git] / src / Protocol / ActivityPub / Processor.php
1 <?php
2 /**
3  * @copyright Copyright (C) 2010-2022, the Friendica project
4  *
5  * @license GNU AGPL version 3 or any later version
6  *
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.
11  *
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.
16  *
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/>.
19  *
20  */
21
22 namespace Friendica\Protocol\ActivityPub;
23
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\Core\Worker;
31 use Friendica\Database\DBA;
32 use Friendica\DI;
33 use Friendica\Model\APContact;
34 use Friendica\Model\Contact;
35 use Friendica\Model\Conversation;
36 use Friendica\Model\Event;
37 use Friendica\Model\GServer;
38 use Friendica\Model\Item;
39 use Friendica\Model\ItemURI;
40 use Friendica\Model\Mail;
41 use Friendica\Model\Tag;
42 use Friendica\Model\User;
43 use Friendica\Model\Post;
44 use Friendica\Protocol\Activity;
45 use Friendica\Protocol\ActivityPub;
46 use Friendica\Protocol\Relay;
47 use Friendica\Util\DateTimeFormat;
48 use Friendica\Util\JsonLD;
49 use Friendica\Util\Strings;
50 use Friendica\Worker\Delivery;
51
52 /**
53  * ActivityPub Processor Protocol class
54  */
55 class Processor
56 {
57         /**
58          * Extracts the tag character (#, @, !) from mention links
59          *
60          * @param string $body
61          * @return string
62          */
63         protected static function normalizeMentionLinks(string $body): string
64         {
65                 return preg_replace('%\[url=([^\[\]]*)]([#@!])(.*?)\[/url]%ism', '$2[url=$1]$3[/url]', $body);
66         }
67
68         /**
69          * Convert the language array into a language JSON
70          *
71          * @param array $languages
72          * @return string language JSON
73          */
74         private static function processLanguages(array $languages)
75         {
76                 $codes = array_keys($languages);
77                 $lang = [];
78                 foreach ($codes as $code) {
79                         $lang[$code] = 1;
80                 }
81
82                 if (empty($lang)) {
83                         return '';
84                 }
85
86                 return json_encode($lang);
87         }
88         /**
89          * Replaces emojis in the body
90          *
91          * @param array $emojis
92          * @param string $body
93          *
94          * @return string with replaced emojis
95          */
96         private static function replaceEmojis(int $uri_id, $body, array $emojis)
97         {
98                 $body = strtr($body,
99                         array_combine(
100                                 array_column($emojis, 'name'),
101                                 array_map(function ($emoji) {
102                                         return '[emoji=' . $emoji['href'] . ']' . $emoji['name'] . '[/emoji]';
103                                 }, $emojis)
104                         )
105                 );
106
107                 // We store the emoji here to be able to avoid storing it in the media
108                 foreach ($emojis as $emoji) {
109                         Post\Link::getByLink($uri_id, $emoji['href']);
110                 }
111                 return $body;
112         }
113
114         /**
115          * Store attached media files in the post-media table
116          *
117          * @param int $uriid
118          * @param array $attachment
119          * @return void
120          */
121         private static function storeAttachmentAsMedia(int $uriid, array $attachment)
122         {
123                 if (empty($attachment['url'])) {
124                         return;
125                 }
126
127                 $data = ['uri-id' => $uriid];
128                 $data['type'] = Post\Media::UNKNOWN;
129                 $data['url'] = $attachment['url'];
130                 $data['mimetype'] = $attachment['mediaType'] ?? null;
131                 $data['height'] = $attachment['height'] ?? null;
132                 $data['width'] = $attachment['width'] ?? null;
133                 $data['size'] = $attachment['size'] ?? null;
134                 $data['preview'] = $attachment['image'] ?? null;
135                 $data['description'] = $attachment['name'] ?? null;
136
137                 Post\Media::insert($data);
138         }
139
140         /**
141          * Stire attachment data
142          *
143          * @param array   $activity
144          * @param array   $item
145          */
146         private static function storeAttachments($activity, $item)
147         {
148                 if (empty($activity['attachments'])) {
149                         return;
150                 }
151
152                 foreach ($activity['attachments'] as $attach) {
153                         self::storeAttachmentAsMedia($item['uri-id'], $attach);
154                 }
155         }
156
157         /**
158          * Store attachment data
159          *
160          * @param array   $activity
161          * @param array   $item
162          */
163         private static function storeQuestion($activity, $item)
164         {
165                 if (empty($activity['question'])) {
166                         return;
167                 }
168                 $question = ['multiple' => $activity['question']['multiple']];
169
170                 if (!empty($activity['question']['voters'])) {
171                         $question['voters'] = $activity['question']['voters'];
172                 }
173
174                 if (!empty($activity['question']['end-time'])) {
175                         $question['end-time'] = DateTimeFormat::utc($activity['question']['end-time']);
176                 }
177
178                 Post\Question::update($item['uri-id'], $question);
179
180                 foreach ($activity['question']['options'] as $key => $option) {
181                         $option = ['name' => $option['name'], 'replies' => $option['replies']];
182                         Post\QuestionOption::update($item['uri-id'], $key, $option);
183                 }
184
185                 Logger::debug('Storing incoming question', ['type' => $activity['type'], 'uri-id' => $item['uri-id'], 'question' => $activity['question']]);
186         }
187
188         /**
189          * Updates a message
190          *
191          * @param array $activity Activity array
192          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
193          */
194         public static function updateItem($activity)
195         {
196                 $item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity', 'post-type'], ['uri' => $activity['id']]);
197                 if (!DBA::isResult($item)) {
198                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
199                         $item = self::createItem($activity);
200                         if (empty($item)) {
201                                 return;
202                         }
203
204                         self::postItem($activity, $item);
205                         return;
206                 }
207
208                 $item['changed'] = DateTimeFormat::utcNow();
209                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
210
211                 $item = self::processContent($activity, $item);
212
213                 self::storeAttachments($activity, $item);
214                 self::storeQuestion($activity, $item);
215
216                 if (empty($item)) {
217                         return;
218                 }
219
220                 Post\History::add($item['uri-id'], $item);
221                 Item::update($item, ['uri' => $activity['id']]);
222
223                 if ($activity['object_type'] == 'as:Event') {
224                         $posts = Post::select(['event-id', 'uid'], ["`uri` = ? AND `event-id` > ?", $activity['id'], 0]);
225                         while ($post = DBA::fetch($posts)) {
226                                 self::updateEvent($post['event-id'], $activity);
227                         }
228                 }
229         }
230
231         /**
232          * Update an existing event
233          *
234          * @param int $event_id
235          * @param array $activity
236          */
237         private static function updateEvent(int $event_id, array $activity)
238         {
239                 $event = DBA::selectFirst('event', [], ['id' => $event_id]);
240
241                 $event['edited']   = DateTimeFormat::utc($activity['updated']);
242                 $event['summary']  = HTML::toBBCode($activity['name']);
243                 $event['desc']     = HTML::toBBCode($activity['content']);
244                 if (!empty($activity['start-time'])) {
245                         $event['start']  = DateTimeFormat::utc($activity['start-time']);
246                 }
247                 if (!empty($activity['end-time'])) {
248                         $event['finish'] = DateTimeFormat::utc($activity['end-time']);
249                 }
250                 $event['nofinish'] = empty($event['finish']);
251                 $event['location'] = $activity['location'];
252
253                 Logger::info('Updating event', ['uri' => $activity['id'], 'id' => $event_id]);
254                 Event::store($event);
255         }
256
257         /**
258          * Prepares data for a message
259          *
260          * @param array $activity Activity array
261          * @return array Internal item
262          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
263          * @throws \ImagickException
264          */
265         public static function createItem($activity)
266         {
267                 $item = [];
268                 $item['verb'] = Activity::POST;
269                 $item['thr-parent'] = $activity['reply-to-id'];
270
271                 if ($activity['reply-to-id'] == $activity['id']) {
272                         $item['gravity'] = GRAVITY_PARENT;
273                         $item['object-type'] = Activity\ObjectType::NOTE;
274                 } else {
275                         $item['gravity'] = GRAVITY_COMMENT;
276                         $item['object-type'] = Activity\ObjectType::COMMENT;
277                 }
278
279                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
280                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
281                         self::fetchMissingActivity($activity['reply-to-id'], $activity, '', Receiver::COMPLETION_AUTO);
282                 }
283
284                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
285
286                 /// @todo What to do with $activity['context']?
287                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
288                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
289                         return [];
290                 }
291
292                 $item['network'] = Protocol::ACTIVITYPUB;
293                 $item['author-link'] = $activity['author'];
294                 $item['author-id'] = Contact::getIdForURL($activity['author']);
295                 $item['owner-link'] = $activity['actor'];
296                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
297
298                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
299                         $item['private'] = Item::UNLISTED;
300                 } elseif (in_array(0, $activity['receiver'])) {
301                         $item['private'] = Item::PUBLIC;
302                 } else {
303                         $item['private'] = Item::PRIVATE;
304                 }
305
306                 if (!empty($activity['raw'])) {
307                         $item['source'] = $activity['raw'];
308                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
309                         $item['conversation-href'] = $activity['context'] ?? '';
310                         $item['conversation-uri'] = $activity['conversation'] ?? '';
311
312                         if (isset($activity['push'])) {
313                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
314                         }
315                 }
316
317                 if (!empty($activity['from-relay'])) {
318                         $item['direction'] = Conversation::RELAY;
319                 }
320
321                 if ($activity['object_type'] == 'as:Article') {
322                         $item['post-type'] = Item::PT_ARTICLE;
323                 } elseif ($activity['object_type'] == 'as:Audio') {
324                         $item['post-type'] = Item::PT_AUDIO;
325                 } elseif ($activity['object_type'] == 'as:Document') {
326                         $item['post-type'] = Item::PT_DOCUMENT;
327                 } elseif ($activity['object_type'] == 'as:Event') {
328                         $item['post-type'] = Item::PT_EVENT;
329                 } elseif ($activity['object_type'] == 'as:Image') {
330                         $item['post-type'] = Item::PT_IMAGE;
331                 } elseif ($activity['object_type'] == 'as:Page') {
332                         $item['post-type'] = Item::PT_PAGE;
333                 } elseif ($activity['object_type'] == 'as:Question') {
334                         $item['post-type'] = Item::PT_POLL;
335                 } elseif ($activity['object_type'] == 'as:Video') {
336                         $item['post-type'] = Item::PT_VIDEO;
337                 } else {
338                         $item['post-type'] = Item::PT_NOTE;
339                 }
340
341                 $item['isForum'] = false;
342
343                 if (!empty($activity['thread-completion'])) {
344                         if ($activity['thread-completion'] != $item['owner-id']) {
345                                 $actor = Contact::getById($activity['thread-completion'], ['url']);
346                                 $item['causer-link'] = $actor['url'];
347                                 $item['causer-id'] = $activity['thread-completion'];
348                                 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
349                         } else {
350                                 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
351                                 $item['causer-link'] = $item['owner-link'];
352                                 $item['causer-id']   = $item['owner-id'];
353                                 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
354                         }
355
356                         $item['owner-link'] = $item['author-link'];
357                         $item['owner-id'] = $item['author-id'];
358                 } else {
359                         $actor = APContact::getByURL($item['owner-link'], false);
360                         $item['isForum'] = ($actor['type'] == 'Group');
361                 }
362
363                 $item['uri'] = $activity['id'];
364
365                 if (empty($activity['published']) || empty($activity['updated'])) {
366                         DI::logger()->notice('published or updated keys are empty for activity', ['activity' => $activity, 'callstack' => System::callstack(10)]);
367                 }
368
369                 $item['created'] = DateTimeFormat::utc($activity['published'] ?? 'now');
370                 $item['edited'] = DateTimeFormat::utc($activity['updated'] ?? 'now');
371                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
372                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
373
374                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
375                 if (empty($item['uri-id'])) {
376                         Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
377                         return [];
378                 }
379
380                 $item = self::processContent($activity, $item);
381                 if (empty($item)) {
382                         Logger::info('Message was not processed');
383                         return [];
384                 }
385
386                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
387
388                 self::storeAttachments($activity, $item);
389                 self::storeQuestion($activity, $item);
390
391                 // We received the post via AP, so we set the protocol of the server to AP
392                 $contact = Contact::getById($item['author-id'], ['gsid']);
393                 if (!empty($contact['gsid'])) {
394                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
395                 }
396
397                 if ($item['author-id'] != $item['owner-id']) {
398                         $contact = Contact::getById($item['owner-id'], ['gsid']);
399                         if (!empty($contact['gsid'])) {
400                                 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
401                         }
402                 }
403
404                 return $item;
405         }
406
407         /**
408          * Delete items
409          *
410          * @param array $activity
411          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
412          * @throws \ImagickException
413          */
414         public static function deleteItem($activity)
415         {
416                 $owner = Contact::getIdForURL($activity['actor']);
417
418                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
419                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
420         }
421
422         /**
423          * Prepare the item array for an activity
424          *
425          * @param array $activity Activity array
426          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
427          * @throws \ImagickException
428          */
429         public static function addTag($activity)
430         {
431                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
432                         return;
433                 }
434
435                 foreach ($activity['receiver'] as $receiver) {
436                         $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
437                         if (!DBA::isResult($item)) {
438                                 // We don't fetch missing content for this purpose
439                                 continue;
440                         }
441
442                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
443                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
444                                 continue;
445                         }
446
447                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
448                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
449                 }
450         }
451
452         /**
453          * Prepare the item array for an activity
454          *
455          * @param array  $activity Activity array
456          * @param string $verb     Activity verb
457          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
458          * @throws \ImagickException
459          */
460         public static function createActivity($activity, $verb)
461         {
462                 $item = self::createItem($activity);
463                 if (empty($item)) {
464                         return;
465                 }
466
467                 $item['verb'] = $verb;
468                 $item['thr-parent'] = $activity['object_id'];
469                 $item['gravity'] = GRAVITY_ACTIVITY;
470                 unset($item['post-type']);
471                 $item['object-type'] = Activity\ObjectType::NOTE;
472
473                 if (!empty($activity['content'])) {
474                         $item['body'] = HTML::toBBCode($activity['content']);
475                 }
476
477                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
478
479                 self::postItem($activity, $item);
480         }
481
482         /**
483          * Fetch the Uri-Id of a post for the "featured" collection
484          *
485          * @param array $activity
486          * @return null|int
487          */
488         private static function getUriIdForFeaturedCollection(array $activity)
489         {
490                 $actor = APContact::getByURL($activity['actor']);
491                 if (empty($actor)) {
492                         return null;
493                 }
494
495                 // Refetch the account when the "featured" collection is missing.
496                 // This can be removed in a future version (end of 2022 should be good).
497                 if (empty($actor['featured'])) {
498                         $actor = APContact::getByURL($activity['actor'], true);
499                         if (empty($actor)) {
500                                 return null;
501                         }
502                 }
503
504                 if ($activity['target_id'] != $actor['featured']) {
505                         return null;
506                 }
507
508                 $id = Contact::getIdForURL($activity['actor']);
509                 if (empty($id)) {
510                         return null;
511                 }
512
513                 $parent = Post::selectFirst(['uri-id'], ['uri' => $activity['object_id'], 'author-id' => $id]);
514                 if (!empty($parent['uri-id'])) {
515                         return $parent['uri-id'];
516                 }
517
518                 return null;
519         }
520
521         /**
522          * Add a post to the "Featured" collection
523          *
524          * @param array $activity
525          */
526         public static function addToFeaturedCollection(array $activity)
527         {
528                 $uriid = self::getUriIdForFeaturedCollection($activity);
529                 if (empty($uriid)) {
530                         return;
531                 }
532
533                 Logger::debug('Add post to featured collection', ['uri-id' => $uriid]);
534
535                 Post\Collection::add($uriid, Post\Collection::FEATURED);
536         }
537
538         /**
539          * Remove a post to the "Featured" collection
540          *
541          * @param array $activity
542          */
543         public static function removeFromFeaturedCollection(array $activity)
544         {
545                 $uriid = self::getUriIdForFeaturedCollection($activity);
546                 if (empty($uriid)) {
547                         return;
548                 }
549
550                 Logger::debug('Remove post from featured collection', ['uri-id' => $uriid]);
551
552                 Post\Collection::remove($uriid, Post\Collection::FEATURED);
553         }
554
555         /**
556          * Create an event
557          *
558          * @param array $activity Activity array
559          * @param array $item
560          *
561          * @return int event id
562          * @throws \Exception
563          */
564         public static function createEvent($activity, $item)
565         {
566                 $event['summary']   = HTML::toBBCode($activity['name'] ?: $activity['summary']);
567                 $event['desc']      = HTML::toBBCode($activity['content']);
568                 if (!empty($activity['start-time'])) {
569                         $event['start']  = DateTimeFormat::utc($activity['start-time']);
570                 }
571                 if (!empty($activity['end-time'])) {
572                         $event['finish'] = DateTimeFormat::utc($activity['end-time']);
573                 }
574                 $event['nofinish']  = empty($event['finish']);
575                 $event['location']  = $activity['location'];
576                 $event['cid']       = $item['contact-id'];
577                 $event['uid']       = $item['uid'];
578                 $event['uri']       = $item['uri'];
579                 $event['edited']    = $item['edited'];
580                 $event['private']   = $item['private'];
581                 $event['guid']      = $item['guid'];
582                 $event['plink']     = $item['plink'];
583                 $event['network']   = $item['network'];
584                 $event['protocol']  = $item['protocol'];
585                 $event['direction'] = $item['direction'];
586                 $event['source']    = $item['source'];
587
588                 $ev = DBA::selectFirst('event', ['id'], ['uri' => $item['uri'], 'uid' => $item['uid']]);
589                 if (DBA::isResult($ev)) {
590                         $event['id'] = $ev['id'];
591                 }
592
593                 $event_id = Event::store($event);
594
595                 Logger::info('Event was stored', ['id' => $event_id]);
596
597                 return $event_id;
598         }
599
600         /**
601          * Process the content
602          *
603          * @param array $activity Activity array
604          * @param array $item
605          * @return array|bool Returns the item array or false if there was an unexpected occurrence
606          * @throws \Exception
607          */
608         private static function processContent($activity, $item)
609         {
610                 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
611                         $item['title'] = strip_tags($activity['name']);
612                         $content = Markdown::toBBCode($activity['content']);
613                 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
614                         $item['title'] = $activity['name'];
615                         $content = $activity['content'];
616                 } else {
617                         // By default assume "text/html"
618                         $item['title'] = HTML::toBBCode($activity['name']);
619                         $content = HTML::toBBCode($activity['content']);
620                 }
621
622                 $item['title'] = trim(BBCode::toPlaintext($item['title']));
623
624                 if (!empty($activity['languages'])) {
625                         $item['language'] = self::processLanguages($activity['languages']);
626                 }
627
628                 if (!empty($activity['emojis'])) {
629                         $content = self::replaceEmojis($item['uri-id'], $content, $activity['emojis']);
630                 }
631
632                 $content = self::addMentionLinks($content, $activity['tags']);
633
634                 if (!empty($activity['source'])) {
635                         $item['body'] = $activity['source'];
636                         $item['raw-body'] = $content;
637                         $item['body'] = Item::improveSharedDataInBody($item);
638                 } else {
639                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
640                                 $item_private = !in_array(0, $activity['item_receiver']);
641                                 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
642                                 if (!DBA::isResult($parent)) {
643                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
644                                         return false;
645                                 }
646                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
647                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
648                                         return false;
649                                 }
650
651                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
652                         }
653                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
654                         $item['raw-body'] = $item['body'] = $content;
655                 }
656
657                 self::storeFromBody($item);
658                 self::storeTags($item['uri-id'], $activity['tags']);
659
660                 self::storeReceivers($item['uri-id'], $activity['receiver_urls'] ?? []);
661
662                 $item['location'] = $activity['location'];
663
664                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
665                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
666                 }
667
668                 $item['app'] = $activity['generator'];
669
670                 return $item;
671         }
672
673         /**
674          * Store hashtags and mentions
675          *
676          * @param array $item
677          */
678         private static function storeFromBody(array $item)
679         {
680                 // Make sure to delete all existing tags (can happen when called via the update functionality)
681                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
682
683                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
684         }
685
686         /**
687          * Generate a GUID out of an URL of an ActivityPub post.
688          *
689          * @param string $url message URL
690          * @return string with GUID
691          */
692         private static function getGUIDByURL(string $url)
693         {
694                 $parsed = parse_url($url);
695
696                 $host_hash = hash('crc32', $parsed['host']);
697
698                 unset($parsed["scheme"]);
699                 unset($parsed["host"]);
700
701                 $path = implode("/", $parsed);
702
703                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
704         }
705
706         /**
707          * Checks if an incoming message is wanted
708          *
709          * @param array $activity
710          * @param array $item
711          * @return boolean Is the message wanted?
712          */
713         private static function isSolicitedMessage(array $activity, array $item)
714         {
715                 // The checks are split to improve the support when searching why a message was accepted.
716                 if (count($activity['receiver']) != 1) {
717                         // The message has more than one receiver, so it is wanted.
718                         Logger::debug('Message has got several receivers - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
719                         return true;
720                 }
721
722                 if ($item['private'] == Item::PRIVATE) {
723                         // We only look at public posts here. Private posts are expected to be intentionally posted to the single receiver.
724                         Logger::debug('Message is private - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
725                         return true;
726                 }
727
728                 if (!empty($activity['from-relay'])) {
729                         // We check relay posts at another place. When it arrived here, the message is already checked.
730                         Logger::debug('Message is a relay post that is already checked - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
731                         return true;
732                 }
733
734                 if (in_array($activity['completion-mode'] ?? Receiver::COMPLETION_NONE, [Receiver::COMPLETION_MANUAL, Receiver::COMPLETION_ANNOUCE])) {
735                         // Manual completions and completions caused by reshares are allowed without any further checks.
736                         Logger::debug('Message is in completion mode - accepted', ['mode' => $activity['completion-mode'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
737                         return true;
738                 }
739
740                 if ($item['gravity'] != GRAVITY_PARENT) {
741                         // We cannot reliably check at this point if a comment or activity belongs to an accepted post or needs to be fetched
742                         // This can possibly be improved in the future.
743                         Logger::debug('Message is no parent - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
744                         return true;
745                 }
746
747                 $tags = array_column(Tag::getByURIId($item['uri-id'], [Tag::HASHTAG]), 'name');
748                 if (Relay::isSolicitedPost($tags, $item['body'], $item['author-id'], $item['uri'], Protocol::ACTIVITYPUB)) {
749                         Logger::debug('Post is accepted because of the relay settings', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
750                         return true;
751                 } else {
752                         return false;
753                 }
754         }
755
756         /**
757          * Creates an item post
758          *
759          * @param array $activity Activity data
760          * @param array $item     item array
761          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
762          * @throws \ImagickException
763          */
764         public static function postItem(array $activity, array $item)
765         {
766                 if (empty($item)) {
767                         return;
768                 }
769
770                 $stored = false;
771                 ksort($activity['receiver']);
772
773                 if (!self::isSolicitedMessage($activity, $item)) {
774                         DBA::delete('item-uri', ['id' => $item['uri-id']]);
775                         return;
776                 }
777
778                 foreach ($activity['receiver'] as $receiver) {
779                         if ($receiver == -1) {
780                                 continue;
781                         }
782
783                         $item['uid'] = $receiver;
784
785                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
786                         switch($type) {
787                                 case Receiver::TARGET_TO:
788                                         $item['post-reason'] = Item::PR_TO;
789                                         break;
790                                 case Receiver::TARGET_CC:
791                                         $item['post-reason'] = Item::PR_CC;
792                                         break;
793                                 case Receiver::TARGET_BTO:
794                                         $item['post-reason'] = Item::PR_BTO;
795                                         break;
796                                 case Receiver::TARGET_BCC:
797                                         $item['post-reason'] = Item::PR_BCC;
798                                         break;
799                                 case Receiver::TARGET_FOLLOWER:
800                                         $item['post-reason'] = Item::PR_FOLLOWER;
801                                         break;
802                                 case Receiver::TARGET_ANSWER:
803                                         $item['post-reason'] = Item::PR_COMMENT;
804                                         break;
805                                 case Receiver::TARGET_GLOBAL:
806                                         $item['post-reason'] = Item::PR_GLOBAL;
807                                         break;
808                                 default:
809                                         $item['post-reason'] = Item::PR_NONE;
810                         }
811
812                         if (!empty($activity['from-relay'])) {
813                                 $item['post-reason'] = Item::PR_RELAY;
814                         } elseif (!empty($activity['thread-completion'])) {
815                                 $item['post-reason'] = Item::PR_FETCHED;
816                         }
817
818                         if ($item['isForum'] ?? false) {
819                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
820                         } else {
821                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
822                         }
823
824                         if (($receiver != 0) && empty($item['contact-id'])) {
825                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
826                         }
827
828                         if (!empty($activity['directmessage'])) {
829                                 self::postMail($activity, $item);
830                                 continue;
831                         }
832
833                         if (!($item['isForum'] ?? false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT) && !Contact::isSharingByURL($activity['author'], $receiver)) {
834                                 if ($item['post-reason'] == Item::PR_BCC) {
835                                         Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id']]);
836                                         continue;
837                                 }
838
839                                 if (
840                                         !empty($activity['thread-children-type'])
841                                         && in_array($activity['thread-children-type'], Receiver::ACTIVITY_TYPES)
842                                         && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') != Item::COMPLETION_LIKE
843                                 ) {
844                                         Logger::info('Top level post from thread completion from a non sharer had been initiated via an activity, ignoring',
845                                                 ['type' => $activity['thread-children-type'], 'user' => $item['uid'], 'causer' => $item['causer-link'], 'author' => $activity['author'], 'url' => $item['uri']]);
846                                         continue;
847                                 }
848                         }
849
850                         $is_forum = false;
851
852                         if ($receiver != 0) {
853                                 $user = User::getById($receiver, ['account-type']);
854                                 if (!empty($user['account-type'])) {
855                                         $is_forum = ($user['account-type'] == User::ACCOUNT_TYPE_COMMUNITY);
856                                 }
857                         }
858
859                         if (!$is_forum && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') == Item::COMPLETION_NONE && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
860                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
861
862                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
863                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
864                                 }
865
866                                 if ($skip) {
867                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
868                                         continue;
869                                 }
870
871                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
872                         }
873
874                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
875                                 $event_id = self::createEvent($activity, $item);
876
877                                 $item = Event::getItemArrayForImportedId($event_id, $item);
878                         }
879
880                         $item_id = Item::insert($item);
881                         if ($item_id) {
882                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
883                         } else {
884                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
885                         }
886
887                         if ($item['uid'] == 0) {
888                                 $stored = $item_id;
889                         }
890                 }
891
892                 // Store send a follow request for every reshare - but only when the item had been stored
893                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
894                         $author = APContact::getByURL($item['owner-link'], false);
895                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
896                         if ($author['type'] != 'Group') {
897                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
898                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
899                         }
900                 }
901         }
902
903         /**
904          * Store tags and mentions into the tag table
905          *
906          * @param integer $uriid
907          * @param array $tags
908          */
909         private static function storeTags(int $uriid, array $tags = null)
910         {
911                 foreach ($tags as $tag) {
912                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
913                                 continue;
914                         }
915
916                         $hash = substr($tag['name'], 0, 1);
917
918                         if ($tag['type'] == 'Mention') {
919                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
920                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
921                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
922                                         $tag['name'] = substr($tag['name'], 1);
923                                 }
924                                 $type = Tag::IMPLICIT_MENTION;
925
926                                 if (!empty($tag['href'])) {
927                                         $apcontact = APContact::getByURL($tag['href']);
928                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
929                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
930                                         }
931                                 }
932                         } elseif ($tag['type'] == 'Hashtag') {
933                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
934                                         $tag['name'] = substr($tag['name'], 1);
935                                 }
936                                 $type = Tag::HASHTAG;
937                         }
938
939                         if (empty($tag['name'])) {
940                                 continue;
941                         }
942
943                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
944                 }
945         }
946
947         public static function storeReceivers(int $uriid, array $receivers)
948         {
949                 foreach (['as:to' => Tag::TO, 'as:cc' => Tag::CC, 'as:bto' => Tag::BTO, 'as:bcc' => Tag::BCC] as $element => $type) {
950                         if (!empty($receivers[$element])) {
951                                 foreach ($receivers[$element] as $receiver) {
952                                         if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
953                                                 $name = Receiver::PUBLIC_COLLECTION;
954                                         } else {
955                                                 $name = trim(parse_url($receiver, PHP_URL_PATH), '/');
956                                         }
957
958                                         $target = Tag::getTargetType($receiver);
959                                         Logger::debug('Got target type', ['type' => $target, 'url' => $receiver]);
960                                         Tag::store($uriid, $type, $name, $receiver, $target);
961                                 }
962                         }
963                 }
964         }
965
966         /**
967          * Creates an mail post
968          *
969          * @param array $activity Activity data
970          * @param array $item     item array
971          * @return int|bool New mail table row id or false on error
972          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
973          */
974         private static function postMail($activity, $item)
975         {
976                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
977                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
978                         return false;
979                 }
980
981                 Logger::info('Direct Message', $item);
982
983                 $msg = [];
984                 $msg['uid'] = $item['uid'];
985
986                 $msg['contact-id'] = $item['contact-id'];
987
988                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
989                 $msg['from-name'] = $contact['name'];
990                 $msg['from-url'] = $contact['url'];
991                 $msg['from-photo'] = $contact['photo'];
992
993                 $msg['uri'] = $item['uri'];
994                 $msg['created'] = $item['created'];
995
996                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
997                 if (DBA::isResult($parent)) {
998                         $msg['parent-uri'] = $parent['parent-uri'];
999                         $msg['title'] = $parent['title'];
1000                 } else {
1001                         $msg['parent-uri'] = $item['thr-parent'];
1002
1003                         if (!empty($item['title'])) {
1004                                 $msg['title'] = $item['title'];
1005                         } elseif (!empty($item['content-warning'])) {
1006                                 $msg['title'] = $item['content-warning'];
1007                         } else {
1008                                 // Trying to generate a title out of the body
1009                                 $title = $item['body'];
1010
1011                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
1012                                         $title = $matches[3];
1013                                 }
1014
1015                                 $title = trim(BBCode::toPlaintext($title));
1016
1017                                 if (strlen($title) > 20) {
1018                                         $title = substr($title, 0, 20) . '...';
1019                                 }
1020
1021                                 $msg['title'] = $title;
1022                         }
1023                 }
1024                 $msg['body'] = $item['body'];
1025
1026                 return Mail::insert($msg);
1027         }
1028
1029         /**
1030          * Fetch featured posts from a contact with the given url
1031          *
1032          * @param string $url
1033          * @return void
1034          */
1035         public static function fetchFeaturedPosts(string $url)
1036         {
1037                 Logger::info('Fetch featured posts', ['contact' => $url]);
1038
1039                 $apcontact = APContact::getByURL($url);
1040                 if (empty($apcontact['featured'])) {
1041                         Logger::info('Contact does not have a featured collection', ['contact' => $url]);
1042                         return;
1043                 }
1044
1045                 $pcid = Contact::getIdForURL($url, 0, false);
1046                 if (empty($pcid)) {
1047                         Logger::info('Contact not found', ['contact' => $url]);
1048                         return;
1049                 }
1050
1051                 $posts = Post\Collection::selectToArrayForContact($pcid, Post\Collection::FEATURED);
1052                 if (!empty($posts)) {
1053                         $old_featured = array_column($posts, 'uri-id');
1054                 } else {
1055                         $old_featured = [];
1056                 }
1057
1058                 $featured = ActivityPub::fetchItems($apcontact['featured']);
1059                 if (empty($featured)) {
1060                         Logger::info('Contact does not have featured posts', ['contact' => $url]);
1061
1062                         foreach ($old_featured as $uri_id) {
1063                                 Post\Collection::remove($uri_id, Post\Collection::FEATURED);
1064                                 Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
1065                         }
1066                         return;
1067                 }
1068
1069                 $new = 0;
1070                 $old = 0;
1071
1072                 foreach ($featured as $post) {
1073                         if (empty($post['id'])) {
1074                                 continue;
1075                         }
1076                         $id = Item::fetchByLink($post['id']);
1077                         if (!empty($id)) {
1078                                 $item = Post::selectFirst(['uri-id', 'featured'], ['id' => $id]);
1079                                 if (!empty($item['uri-id'])) {
1080                                         if (!$item['featured']) {
1081                                                 Post\Collection::add($item['uri-id'], Post\Collection::FEATURED);
1082                                                 Logger::debug('Added featured post', ['uri-id' => $item['uri-id'], 'contact' => $url]);
1083                                                 $new++;
1084                                         } else {
1085                                                 Logger::debug('Post already had been featured', ['uri-id' => $item['uri-id'], 'contact' => $url]);
1086                                                 $old++;
1087                                         }
1088
1089                                         $index = array_search($item['uri-id'], $old_featured);
1090                                         if (!($index === false)) {
1091                                                 unset($old_featured[$index]);
1092                                         }
1093                                 }
1094                         }
1095                 }
1096
1097                 foreach ($old_featured as $uri_id) {
1098                         Post\Collection::remove($uri_id, Post\Collection::FEATURED);
1099                         Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
1100                 }
1101
1102                 Logger::info('Fetched featured posts', ['new' => $new, 'old' => $old, 'contact' => $url]);
1103         }
1104
1105         /**
1106          * Fetches missing posts
1107          *
1108          * @param string $url         message URL
1109          * @param array  $child       activity array with the child of this message
1110          * @param string $relay_actor Relay actor
1111          * @param int    $completion  Completion mode, see Receiver::COMPLETION_*
1112          * @return string fetched message URL
1113          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1114          */
1115         public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '', int $completion = Receiver::COMPLETION_MANUAL)
1116         {
1117                 if (!empty($child['receiver'])) {
1118                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
1119                 } else {
1120                         $uid = 0;
1121                 }
1122
1123                 $object = ActivityPub::fetchContent($url, $uid);
1124                 if (empty($object)) {
1125                         Logger::notice('Activity was not fetchable, aborting.', ['url' => $url]);
1126                         return '';
1127                 }
1128
1129                 if (empty($object['id'])) {
1130                         Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
1131                         return '';
1132                 }
1133
1134                 if (!empty($object['actor'])) {
1135                         $object_actor = $object['actor'];
1136                 } elseif (!empty($object['attributedTo'])) {
1137                         $object_actor = $object['attributedTo'];
1138                         if (is_array($object_actor)) {
1139                                 $compacted = JsonLD::compact($object);
1140                                 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
1141                         }
1142                 } else {
1143                         // Shouldn't happen
1144                         $object_actor = '';
1145                 }
1146
1147                 $signer = [$object_actor];
1148
1149                 if (!empty($child['author'])) {
1150                         $actor = $child['author'];
1151                         $signer[] = $actor;
1152                 } else {
1153                         $actor = $object_actor;
1154                 }
1155
1156                 if (!empty($object['published'])) {
1157                         $published = $object['published'];
1158                 } elseif (!empty($child['published'])) {
1159                         $published = $child['published'];
1160                 } else {
1161                         $published = DateTimeFormat::utcNow();
1162                 }
1163
1164                 $activity = [];
1165                 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
1166                 unset($object['@context']);
1167                 $activity['id'] = $object['id'];
1168                 $activity['to'] = $object['to'] ?? [];
1169                 $activity['cc'] = $object['cc'] ?? [];
1170                 $activity['actor'] = $actor;
1171                 $activity['object'] = $object;
1172                 $activity['published'] = $published;
1173                 $activity['type'] = 'Create';
1174
1175                 $ldactivity = JsonLD::compact($activity);
1176
1177                 if (!empty($relay_actor)) {
1178                         $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
1179                         $ldactivity['completion-mode']   = Receiver::COMPLETION_RELAY;
1180                 } elseif (!empty($child['thread-completion'])) {
1181                         $ldactivity['thread-completion'] = $child['thread-completion'];
1182                         $ldactivity['completion-mode']   = $child['completion-mode'] ?? Receiver::COMPLETION_NONE;
1183                 } else {
1184                         $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
1185                         $ldactivity['completion-mode']   = $completion;
1186                 }
1187
1188                 if (!empty($child['type'])) {
1189                         $ldactivity['thread-children-type'] = $child['type'];
1190                 }
1191
1192                 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
1193                         return '';
1194                 }
1195
1196                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
1197
1198                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
1199
1200                 return $activity['id'];
1201         }
1202
1203         /**
1204          * Test if incoming relay messages should be accepted
1205          *
1206          * @param array $activity activity array
1207          * @param string $id      object ID
1208          * @return boolean true if message is accepted
1209          */
1210         private static function acceptIncomingMessage(array $activity, string $id)
1211         {
1212                 if (empty($activity['as:object'])) {
1213                         Logger::info('No object field in activity - accepted', ['id' => $id]);
1214                         return true;
1215                 }
1216
1217                 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
1218                 $uriid = ItemURI::getIdByURI($replyto);
1219                 if (Post::exists(['uri-id' => $uriid])) {
1220                         Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
1221                         return true;
1222                 }
1223
1224                 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
1225                 $authorid = Contact::getIdForURL($attributed_to);
1226
1227                 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
1228
1229                 $messageTags = [];
1230                 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
1231                 if (!empty($tags)) {
1232                         foreach ($tags as $tag) {
1233                                 if ($tag['type'] != 'Hashtag') {
1234                                         continue;
1235                                 }
1236                                 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
1237                         }
1238                 }
1239
1240                 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
1241         }
1242
1243         /**
1244          * perform a "follow" request
1245          *
1246          * @param array $activity
1247          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1248          * @throws \ImagickException
1249          */
1250         public static function followUser($activity)
1251         {
1252                 $uid = User::getIdForURL($activity['object_id']);
1253                 if (empty($uid)) {
1254                         return;
1255                 }
1256
1257                 $owner = User::getOwnerDataById($uid);
1258                 if (empty($owner)) {
1259                         return;
1260                 }
1261
1262                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1263                 if (!empty($cid)) {
1264                         self::switchContact($cid);
1265                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
1266                 }
1267
1268                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
1269                         'author-link' => $activity['actor']];
1270
1271                 // Ensure that the contact has got the right network type
1272                 self::switchContact($item['author-id']);
1273
1274                 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
1275                 if ($result === true) {
1276                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
1277                 }
1278
1279                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1280                 if (empty($cid)) {
1281                         return;
1282                 }
1283
1284                 if ($result && DI::config()->get('system', 'transmit_pending_events') && ($owner['contact-type'] == Contact::TYPE_COMMUNITY)) {
1285                         self::transmitPendingEvents($cid, $owner['uid']);
1286                 }
1287
1288                 if (empty($contact)) {
1289                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
1290                 }
1291
1292                 Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
1293         }
1294
1295         /**
1296          * Transmit pending events to the new follower
1297          *
1298          * @param integer $cid
1299          * @param integer $uid
1300          * @return void
1301          */
1302         private static function transmitPendingEvents(int $cid, int $uid)
1303         {
1304                 $account = DBA::selectFirst('account-user-view', ['ap-inbox', 'ap-sharedinbox'], ['id' => $cid]);
1305                 $inbox = $account['ap-sharedinbox'] ?: $account['ap-inbox'];
1306
1307                 $events = DBA::select('event', ['id'], ["`uid` = ? AND `start` > ? AND `type` != ?", $uid, DateTimeFormat::utcNow(), 'birthday']);
1308                 while ($event = DBA::fetch($events)) {
1309                         $post = Post::selectFirst(['id', 'uri-id', 'created'], ['event-id' => $event['id']]);
1310                         if (empty($post)) {
1311                                 continue;
1312                         }
1313                         if (DI::config()->get('system', 'bulk_delivery')) {
1314                                 Post\Delivery::add($post['uri-id'], $uid, $inbox, $post['created'], Delivery::POST, [$cid]);
1315                                 Worker::add(PRIORITY_HIGH, 'APDelivery', '', 0, $inbox, 0);
1316                         } else {
1317                                 Worker::add(PRIORITY_HIGH, 'APDelivery', Delivery::POST, $post['id'], $inbox, $uid, [$cid], $post['uri-id']);
1318                         }
1319                 }
1320         }
1321
1322         /**
1323          * Update the given profile
1324          *
1325          * @param array $activity
1326          * @throws \Exception
1327          */
1328         public static function updatePerson($activity)
1329         {
1330                 if (empty($activity['object_id'])) {
1331                         return;
1332                 }
1333
1334                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
1335                 Contact::updateFromProbeByURL($activity['object_id']);
1336         }
1337
1338         /**
1339          * Delete the given profile
1340          *
1341          * @param array $activity
1342          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1343          */
1344         public static function deletePerson($activity)
1345         {
1346                 if (empty($activity['object_id']) || empty($activity['actor'])) {
1347                         Logger::info('Empty object id or actor.');
1348                         return;
1349                 }
1350
1351                 if ($activity['object_id'] != $activity['actor']) {
1352                         Logger::info('Object id does not match actor.');
1353                         return;
1354                 }
1355
1356                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
1357                 while ($contact = DBA::fetch($contacts)) {
1358                         Contact::remove($contact['id']);
1359                 }
1360                 DBA::close($contacts);
1361
1362                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
1363         }
1364
1365         /**
1366          * Blocks the user by the contact
1367          *
1368          * @param array $activity
1369          * @throws \Exception
1370          */
1371         public static function blockAccount($activity)
1372         {
1373                 $cid = Contact::getIdForURL($activity['actor']);
1374                 if (empty($cid)) {
1375                         return;
1376                 }
1377
1378                 $uid = User::getIdForURL($activity['object_id']);
1379                 if (empty($uid)) {
1380                         return;
1381                 }
1382
1383                 Contact\User::setIsBlocked($cid, $uid, true);
1384
1385                 Logger::info('Contact blocked user', ['contact' => $cid, 'user' => $uid]);
1386         }
1387
1388         /**
1389          * Unblocks the user by the contact
1390          *
1391          * @param array $activity
1392          * @throws \Exception
1393          */
1394         public static function unblockAccount($activity)
1395         {
1396                 $cid = Contact::getIdForURL($activity['actor']);
1397                 if (empty($cid)) {
1398                         return;
1399                 }
1400
1401                 $uid = User::getIdForURL($activity['object_object']);
1402                 if (empty($uid)) {
1403                         return;
1404                 }
1405
1406                 Contact\User::setIsBlocked($cid, $uid, false);
1407
1408                 Logger::info('Contact unblocked user', ['contact' => $cid, 'user' => $uid]);
1409         }
1410
1411         /**
1412          * Accept a follow request
1413          *
1414          * @param array $activity
1415          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1416          * @throws \ImagickException
1417          */
1418         public static function acceptFollowUser($activity)
1419         {
1420                 $uid = User::getIdForURL($activity['object_actor']);
1421                 if (empty($uid)) {
1422                         return;
1423                 }
1424
1425                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1426                 if (empty($cid)) {
1427                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1428                         return;
1429                 }
1430
1431                 self::switchContact($cid);
1432
1433                 $fields = ['pending' => false];
1434
1435                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1436                 if ($contact['rel'] == Contact::FOLLOWER) {
1437                         $fields['rel'] = Contact::FRIEND;
1438                 }
1439
1440                 $condition = ['id' => $cid];
1441                 Contact::update($fields, $condition);
1442                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1443         }
1444
1445         /**
1446          * Reject a follow request
1447          *
1448          * @param array $activity
1449          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1450          * @throws \ImagickException
1451          */
1452         public static function rejectFollowUser($activity)
1453         {
1454                 $uid = User::getIdForURL($activity['object_actor']);
1455                 if (empty($uid)) {
1456                         return;
1457                 }
1458
1459                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1460                 if (empty($cid)) {
1461                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1462                         return;
1463                 }
1464
1465                 self::switchContact($cid);
1466
1467                 $contact = Contact::getById($cid, ['rel']);
1468                 if ($contact['rel'] == Contact::SHARING) {
1469                         Contact::remove($cid);
1470                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1471                 } elseif ($contact['rel'] == Contact::FRIEND) {
1472                         Contact::update(['rel' => Contact::FOLLOWER], ['id' => $cid]);
1473                 } else {
1474                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1475                 }
1476         }
1477
1478         /**
1479          * Undo activity like "like" or "dislike"
1480          *
1481          * @param array $activity
1482          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1483          * @throws \ImagickException
1484          */
1485         public static function undoActivity($activity)
1486         {
1487                 if (empty($activity['object_id'])) {
1488                         return;
1489                 }
1490
1491                 if (empty($activity['object_actor'])) {
1492                         return;
1493                 }
1494
1495                 $author_id = Contact::getIdForURL($activity['object_actor']);
1496                 if (empty($author_id)) {
1497                         return;
1498                 }
1499
1500                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1501         }
1502
1503         /**
1504          * Activity to remove a follower
1505          *
1506          * @param array $activity
1507          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1508          * @throws \ImagickException
1509          */
1510         public static function undoFollowUser($activity)
1511         {
1512                 $uid = User::getIdForURL($activity['object_object']);
1513                 if (empty($uid)) {
1514                         return;
1515                 }
1516
1517                 $owner = User::getOwnerDataById($uid);
1518                 if (empty($owner)) {
1519                         return;
1520                 }
1521
1522                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1523                 if (empty($cid)) {
1524                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1525                         return;
1526                 }
1527
1528                 self::switchContact($cid);
1529
1530                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1531                 if (!DBA::isResult($contact)) {
1532                         return;
1533                 }
1534
1535                 Contact::removeFollower($contact);
1536                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1537         }
1538
1539         /**
1540          * Switches a contact to AP if needed
1541          *
1542          * @param integer $cid Contact ID
1543          * @throws \Exception
1544          */
1545         private static function switchContact($cid)
1546         {
1547                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1548                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1549                         return;
1550                 }
1551
1552                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1553                 Contact::updateFromProbe($cid);
1554         }
1555
1556         /**
1557          * Collects implicit mentions like:
1558          * - the author of the parent item
1559          * - all the mentioned conversants in the parent item
1560          *
1561          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1562          * @return array
1563          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1564          */
1565         private static function getImplicitMentionList(array $parent)
1566         {
1567                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1568
1569                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1570
1571                 $implicit_mentions = [];
1572                 if (empty($parent_author['url'])) {
1573                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1574                 } else {
1575                         $implicit_mentions[] = $parent_author['url'];
1576                         $implicit_mentions[] = $parent_author['nurl'];
1577                         $implicit_mentions[] = $parent_author['alias'];
1578                 }
1579
1580                 if (!empty($parent['alias'])) {
1581                         $implicit_mentions[] = $parent['alias'];
1582                 }
1583
1584                 foreach ($parent_terms as $term) {
1585                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1586                         if (!empty($contact['url'])) {
1587                                 $implicit_mentions[] = $contact['url'];
1588                                 $implicit_mentions[] = $contact['nurl'];
1589                                 $implicit_mentions[] = $contact['alias'];
1590                         }
1591                 }
1592
1593                 return $implicit_mentions;
1594         }
1595
1596         /**
1597          * Strips from the body prepended implicit mentions
1598          *
1599          * @param string $body
1600          * @param array $parent
1601          * @return string
1602          */
1603         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1604         {
1605                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1606                         return $body;
1607                 }
1608
1609                 $potential_mentions = self::getImplicitMentionList($parent);
1610
1611                 $kept_mentions = [];
1612
1613                 // Extract one prepended mention at a time from the body
1614                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1615                         if (!in_array($matches[2], $potential_mentions)) {
1616                                 $kept_mentions[] = $matches[1];
1617                         }
1618
1619                         $body = $matches[3];
1620                 }
1621
1622                 // Re-appending the kept mentions to the body after extraction
1623                 $kept_mentions[] = $body;
1624
1625                 return implode('', $kept_mentions);
1626         }
1627
1628         /**
1629          * Adds links to string mentions
1630          *
1631          * @param string $body
1632          * @param array  $tags
1633          * @return string
1634          */
1635         protected static function addMentionLinks(string $body, array $tags): string
1636         {
1637                 // This prevents links to be added again to Pleroma-style mention links
1638                 $body = self::normalizeMentionLinks($body);
1639
1640                 $body = BBCode::performWithEscapedTags($body, ['url'], function ($body) use ($tags) {
1641                         foreach ($tags as $tag) {
1642                                 if (empty($tag['name']) || empty($tag['type']) || empty($tag['href']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
1643                                         continue;
1644                                 }
1645
1646                                 $hash = substr($tag['name'], 0, 1);
1647                                 $name = substr($tag['name'], 1);
1648                                 if (!in_array($hash, Tag::TAG_CHARACTER)) {
1649                                         $hash = '';
1650                                         $name = $tag['name'];
1651                                 }
1652
1653                                 $body = str_replace($tag['name'], $hash . '[url=' . $tag['href'] . ']' . $name . '[/url]', $body);
1654                         }
1655
1656                         return $body;
1657                 });
1658
1659                 return $body;
1660         }
1661 }