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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\Database\DBA;
31 use Friendica\DI;
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;
49
50 /**
51  * ActivityPub Processor Protocol class
52  */
53 class Processor
54 {
55         /**
56          * Extracts the tag character (#, @, !) from mention links
57          *
58          * @param string $body
59          * @return string
60          */
61         protected static function normalizeMentionLinks(string $body): string
62         {
63                 return preg_replace('%\[url=([^\[\]]*)]([#@!])(.*?)\[/url]%ism', '$2[url=$1]$3[/url]', $body);
64         }
65
66         /**
67          * Convert the language array into a language JSON
68          *
69          * @param array $languages
70          * @return string language JSON
71          */
72         private static function processLanguages(array $languages)
73         {
74                 $codes = array_keys($languages);
75                 $lang = [];
76                 foreach ($codes as $code) {
77                         $lang[$code] = 1;
78                 }
79
80                 if (empty($lang)) {
81                         return '';
82                 }
83
84                 return json_encode($lang);
85         }
86         /**
87          * Replaces emojis in the body
88          *
89          * @param array $emojis
90          * @param string $body
91          *
92          * @return string with replaced emojis
93          */
94         private static function replaceEmojis(int $uri_id, $body, array $emojis)
95         {
96                 $body = strtr($body,
97                         array_combine(
98                                 array_column($emojis, 'name'),
99                                 array_map(function ($emoji) {
100                                         return '[emoji=' . $emoji['href'] . ']' . $emoji['name'] . '[/emoji]';
101                                 }, $emojis)
102                         )
103                 );
104
105                 // We store the emoji here to be able to avoid storing it in the media
106                 foreach ($emojis as $emoji) {
107                         Post\Link::getByLink($uri_id, $emoji['href']);
108                 }
109                 return $body;
110         }
111
112         /**
113          * Store attached media files in the post-media table
114          *
115          * @param int $uriid
116          * @param array $attachment
117          * @return void
118          */
119         private static function storeAttachmentAsMedia(int $uriid, array $attachment)
120         {
121                 if (empty($attachment['url'])) {
122                         return;
123                 }
124
125                 $data = ['uri-id' => $uriid];
126                 $data['type'] = Post\Media::UNKNOWN;
127                 $data['url'] = $attachment['url'];
128                 $data['mimetype'] = $attachment['mediaType'] ?? null;
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'] = $attachment['name'] ?? null;
134
135                 Post\Media::insert($data);
136         }
137
138         /**
139          * Stire attachment data
140          *
141          * @param array   $activity
142          * @param array   $item
143          */
144         private static function storeAttachments($activity, $item)
145         {
146                 if (empty($activity['attachments'])) {
147                         return;
148                 }
149
150                 foreach ($activity['attachments'] as $attach) {
151                         self::storeAttachmentAsMedia($item['uri-id'], $attach);
152                 }
153         }
154
155         /**
156          * Updates a message
157          *
158          * @param array $activity Activity array
159          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
160          */
161         public static function updateItem($activity)
162         {
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);
168                         return;
169                 }
170
171                 $item['changed'] = DateTimeFormat::utcNow();
172                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
173
174                 $item = self::processContent($activity, $item);
175
176                 self::storeAttachments($activity, $item);
177
178                 if (empty($item)) {
179                         return;
180                 }
181
182                 Item::update($item, ['uri' => $activity['id']]);
183
184                 if ($activity['object_type'] == 'as:Event') {
185                         $posts = Post::select(['event-id', 'uid'], ["`uri` = ? AND `event-id` > ?", $activity['id'], 0]);
186                         while ($post = DBA::fetch($posts)) {
187                                 self::updateEvent($post['event-id'], $activity);
188                         }
189                 }
190         }
191
192         /**
193          * Update an existing event
194          *
195          * @param int $event_id 
196          * @param array $activity 
197          */
198         private static function updateEvent(int $event_id, array $activity)
199         {
200                 $event = DBA::selectFirst('event', [], ['id' => $event_id]);
201
202                 $event['edited']   = DateTimeFormat::utc($activity['updated']);
203                 $event['summary']  = HTML::toBBCode($activity['name']);
204                 $event['desc']     = HTML::toBBCode($activity['content']);
205                 $event['start']    = $activity['start-time'];
206                 $event['finish']   = $activity['end-time'];
207                 $event['nofinish'] = empty($event['finish']);
208                 $event['location'] = $activity['location'];
209
210                 Logger::info('Updating event', ['uri' => $activity['id'], 'id' => $event_id]);
211                 Event::store($event);
212         }
213
214         /**
215          * Prepares data for a message
216          *
217          * @param array $activity Activity array
218          * @return array Internal item
219          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
220          * @throws \ImagickException
221          */
222         public static function createItem($activity)
223         {
224                 $item = [];
225                 $item['verb'] = Activity::POST;
226                 $item['thr-parent'] = $activity['reply-to-id'];
227
228                 if ($activity['reply-to-id'] == $activity['id']) {
229                         $item['gravity'] = GRAVITY_PARENT;
230                         $item['object-type'] = Activity\ObjectType::NOTE;
231                 } else {
232                         $item['gravity'] = GRAVITY_COMMENT;
233                         $item['object-type'] = Activity\ObjectType::COMMENT;
234                 }
235
236                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
237                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
238                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
239                 }
240
241                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
242
243                 /// @todo What to do with $activity['context']?
244                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
245                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
246                         return [];
247                 }
248
249                 $item['network'] = Protocol::ACTIVITYPUB;
250                 $item['author-link'] = $activity['author'];
251                 $item['author-id'] = Contact::getIdForURL($activity['author']);
252                 $item['owner-link'] = $activity['actor'];
253                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
254
255                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
256                         $item['private'] = Item::UNLISTED;
257                 } elseif (in_array(0, $activity['receiver'])) {
258                         $item['private'] = Item::PUBLIC;
259                 } else {
260                         $item['private'] = Item::PRIVATE;
261                 }
262
263                 if (!empty($activity['raw'])) {
264                         $item['source'] = $activity['raw'];
265                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
266                         $item['conversation-href'] = $activity['context'] ?? '';
267                         $item['conversation-uri'] = $activity['conversation'] ?? '';
268
269                         if (isset($activity['push'])) {
270                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
271                         }
272                 }
273
274                 if (!empty($activity['from-relay'])) {
275                         $item['direction'] = Conversation::RELAY;
276                 }
277
278                 if ($activity['object_type'] == 'as:Article') {
279                         $item['post-type'] = Item::PT_ARTICLE;
280                 } elseif ($activity['object_type'] == 'as:Audio') {
281                         $item['post-type'] = Item::PT_AUDIO;
282                 } elseif ($activity['object_type'] == 'as:Document') {
283                         $item['post-type'] = Item::PT_DOCUMENT;
284                 } elseif ($activity['object_type'] == 'as:Event') {
285                         $item['post-type'] = Item::PT_EVENT;
286                 } elseif ($activity['object_type'] == 'as:Image') {
287                         $item['post-type'] = Item::PT_IMAGE;
288                 } elseif ($activity['object_type'] == 'as:Page') {
289                         $item['post-type'] = Item::PT_PAGE;
290                 } elseif ($activity['object_type'] == 'as:Question') {
291                         $item['post-type'] = Item::PT_POLL;
292                 } elseif ($activity['object_type'] == 'as:Video') {
293                         $item['post-type'] = Item::PT_VIDEO;
294                 } else {
295                         $item['post-type'] = Item::PT_NOTE;
296                 }
297
298                 $item['isForum'] = false;
299
300                 if (!empty($activity['thread-completion'])) {
301                         if ($activity['thread-completion'] != $item['owner-id']) {
302                                 $actor = Contact::getById($activity['thread-completion'], ['url']);
303                                 $item['causer-link'] = $actor['url'];
304                                 $item['causer-id'] = $activity['thread-completion'];
305                                 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
306                         } else {
307                                 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
308                                 $item['causer-link'] = $item['owner-link'];
309                                 $item['causer-id']   = $item['owner-id'];
310                                 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
311                         }
312
313                         $item['owner-link'] = $item['author-link'];
314                         $item['owner-id'] = $item['author-id'];
315                 } else {
316                         $actor = APContact::getByURL($item['owner-link'], false);
317                         $item['isForum'] = ($actor['type'] == 'Group');
318                 }
319
320                 $item['uri'] = $activity['id'];
321
322                 if (empty($activity['published']) || empty($activity['updated'])) {
323                         DI::logger()->notice('published or updated keys are empty for activity', ['activity' => $activity, 'callstack' => System::callstack(10)]);
324                 }
325
326                 $item['created'] = DateTimeFormat::utc($activity['published'] ?? 'now');
327                 $item['edited'] = DateTimeFormat::utc($activity['updated'] ?? 'now');
328                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
329                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
330
331                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
332                 if (empty($item['uri-id'])) {
333                         Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
334                         return [];
335                 }
336
337                 $item = self::processContent($activity, $item);
338                 if (empty($item)) {
339                         Logger::info('Message was not processed');
340                         return [];
341                 }
342
343                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
344
345                 self::storeAttachments($activity, $item);
346
347                 // We received the post via AP, so we set the protocol of the server to AP
348                 $contact = Contact::getById($item['author-id'], ['gsid']);
349                 if (!empty($contact['gsid'])) {
350                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
351                 }
352
353                 if ($item['author-id'] != $item['owner-id']) {
354                         $contact = Contact::getById($item['owner-id'], ['gsid']);
355                         if (!empty($contact['gsid'])) {
356                                 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
357                         }
358                 }
359
360                 return $item;
361         }
362
363         /**
364          * Delete items
365          *
366          * @param array $activity
367          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
368          * @throws \ImagickException
369          */
370         public static function deleteItem($activity)
371         {
372                 $owner = Contact::getIdForURL($activity['actor']);
373
374                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
375                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
376         }
377
378         /**
379          * Prepare the item array for an activity
380          *
381          * @param array $activity Activity array
382          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
383          * @throws \ImagickException
384          */
385         public static function addTag($activity)
386         {
387                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
388                         return;
389                 }
390
391                 foreach ($activity['receiver'] as $receiver) {
392                         $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
393                         if (!DBA::isResult($item)) {
394                                 // We don't fetch missing content for this purpose
395                                 continue;
396                         }
397
398                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
399                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
400                                 continue;
401                         }
402
403                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
404                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
405                 }
406         }
407
408         /**
409          * Prepare the item array for an activity
410          *
411          * @param array  $activity Activity array
412          * @param string $verb     Activity verb
413          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
414          * @throws \ImagickException
415          */
416         public static function createActivity($activity, $verb)
417         {
418                 $item = self::createItem($activity);
419                 $item['verb'] = $verb;
420                 $item['thr-parent'] = $activity['object_id'];
421                 $item['gravity'] = GRAVITY_ACTIVITY;
422                 unset($item['post-type']);
423                 $item['object-type'] = Activity\ObjectType::NOTE;
424
425                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
426
427                 self::postItem($activity, $item);
428         }
429
430         /**
431          * Create an event
432          *
433          * @param array $activity Activity array
434          * @param array $item
435          *
436          * @return int event id
437          * @throws \Exception
438          */
439         public static function createEvent($activity, $item)
440         {
441                 $event['summary']   = HTML::toBBCode($activity['name']);
442                 $event['desc']      = HTML::toBBCode($activity['content']);
443                 $event['start']     = $activity['start-time'];
444                 $event['finish']    = $activity['end-time'];
445                 $event['nofinish']  = empty($event['finish']);
446                 $event['location']  = $activity['location'];
447                 $event['cid']       = $item['contact-id'];
448                 $event['uid']       = $item['uid'];
449                 $event['uri']       = $item['uri'];
450                 $event['edited']    = $item['edited'];
451                 $event['private']   = $item['private'];
452                 $event['guid']      = $item['guid'];
453                 $event['plink']     = $item['plink'];
454                 $event['network']   = $item['network'];
455                 $event['protocol']  = $item['protocol'];
456                 $event['direction'] = $item['direction'];
457                 $event['source']    = $item['source'];
458
459                 $ev = DBA::selectFirst('event', ['id'], ['uri' => $item['uri'], 'uid' => $item['uid']]);
460                 if (DBA::isResult($ev)) {
461                         $event['id'] = $ev['id'];
462                 }
463
464                 $event_id = Event::store($event);
465
466                 Logger::info('Event was stored', ['id' => $event_id]);
467
468                 return $event_id;
469         }
470
471         /**
472          * Process the content
473          *
474          * @param array $activity Activity array
475          * @param array $item
476          * @return array|bool Returns the item array or false if there was an unexpected occurrence
477          * @throws \Exception
478          */
479         private static function processContent($activity, $item)
480         {
481                 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
482                         $item['title'] = Markdown::toBBCode($activity['name']);
483                         $content = Markdown::toBBCode($activity['content']);
484                 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
485                         $item['title'] = $activity['name'];
486                         $content = $activity['content'];
487                 } else {
488                         // By default assume "text/html"
489                         $item['title'] = HTML::toBBCode($activity['name']);
490                         $content = HTML::toBBCode($activity['content']);
491                 }
492
493                 if (!empty($activity['languages'])) {
494                         $item['language'] = self::processLanguages($activity['languages']);
495                 }
496
497                 if (!empty($activity['emojis'])) {
498                         $content = self::replaceEmojis($item['uri-id'], $content, $activity['emojis']);
499                 }
500
501                 $content = self::addMentionLinks($content, $activity['tags']);
502
503                 if (!empty($activity['source'])) {
504                         $item['body'] = $activity['source'];
505                         $item['raw-body'] = $content;
506                         $item['body'] = Item::improveSharedDataInBody($item);
507                 } else {
508                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
509                                 $item_private = !in_array(0, $activity['item_receiver']);
510                                 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
511                                 if (!DBA::isResult($parent)) {
512                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
513                                         return false;
514                                 }
515                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
516                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
517                                         return false;
518                                 }
519
520                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
521                         }
522                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
523                         $item['raw-body'] = $item['body'] = $content;
524                 }
525
526                 self::storeFromBody($item);
527                 self::storeTags($item['uri-id'], $activity['tags']);
528
529                 self::storeReceivers($item['uri-id'], $activity['receiver_urls'] ?? []);
530
531                 $item['location'] = $activity['location'];
532
533                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
534                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
535                 }
536
537                 $item['app'] = $activity['generator'];
538
539                 return $item;
540         }
541
542         /**
543          * Store hashtags and mentions
544          *
545          * @param array $item
546          */
547         private static function storeFromBody(array $item)
548         {
549                 // Make sure to delete all existing tags (can happen when called via the update functionality)
550                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
551
552                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
553         }
554
555         /**
556          * Generate a GUID out of an URL
557          *
558          * @param string $url message URL
559          * @return string with GUID
560          */
561         private static function getGUIDByURL(string $url)
562         {
563                 $parsed = parse_url($url);
564
565                 $host_hash = hash('crc32', $parsed['host']);
566
567                 unset($parsed["scheme"]);
568                 unset($parsed["host"]);
569
570                 $path = implode("/", $parsed);
571
572                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
573         }
574
575         /**
576          * Creates an item post
577          *
578          * @param array $activity Activity data
579          * @param array $item     item array
580          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
581          * @throws \ImagickException
582          */
583         public static function postItem(array $activity, array $item)
584         {
585                 if (empty($item)) {
586                         return;
587                 }
588
589                 $stored = false;
590                 ksort($activity['receiver']);
591
592                 foreach ($activity['receiver'] as $receiver) {
593                         if ($receiver == -1) {
594                                 continue;
595                         }
596
597                         $item['uid'] = $receiver;
598
599                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
600                         switch($type) {
601                                 case Receiver::TARGET_TO:
602                                         $item['post-reason'] = Item::PR_TO;
603                                         break;
604                                 case Receiver::TARGET_CC:
605                                         $item['post-reason'] = Item::PR_CC;
606                                         break;
607                                 case Receiver::TARGET_BTO:
608                                         $item['post-reason'] = Item::PR_BTO;
609                                         break;
610                                 case Receiver::TARGET_BCC:
611                                         $item['post-reason'] = Item::PR_BCC;
612                                         break;
613                                 case Receiver::TARGET_FOLLOWER:
614                                         $item['post-reason'] = Item::PR_FOLLOWER;
615                                         break;
616                                 case Receiver::TARGET_ANSWER:
617                                         $item['post-reason'] = Item::PR_COMMENT;
618                                         break;
619                                 case Receiver::TARGET_GLOBAL:
620                                         $item['post-reason'] = Item::PR_GLOBAL;
621                                         break;
622                                 default:
623                                         $item['post-reason'] = Item::PR_NONE;
624                         }
625
626                         if (!empty($activity['from-relay'])) {
627                                 $item['post-reason'] = Item::PR_RELAY;
628                         } elseif (!empty($activity['thread-completion'])) {
629                                 $item['post-reason'] = Item::PR_FETCHED;
630                         }
631
632                         if ($item['isForum'] ?? false) {
633                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
634                         } else {
635                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
636                         }
637
638                         if (($receiver != 0) && empty($item['contact-id'])) {
639                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
640                         }
641
642                         if (!empty($activity['directmessage'])) {
643                                 self::postMail($activity, $item);
644                                 continue;
645                         }
646
647                         if (!($item['isForum'] ?? false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT) && !Contact::isSharingByURL($activity['author'], $receiver)) {
648                                 if ($item['post-reason'] == Item::PR_BCC) {
649                                         Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id']]);
650                                         continue;
651                                 }
652
653                                 if (
654                                         !empty($activity['thread-children-type'])
655                                         && in_array($activity['thread-children-type'], Receiver::ACTIVITY_TYPES)
656                                         && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') != Item::COMPLETION_LIKE
657                                 ) {
658                                         Logger::info('Top level post from thread completion from a non sharer had been initiated via an activity, ignoring',
659                                                 ['type' => $activity['thread-children-type'], 'user' => $item['uid'], 'causer' => $item['causer-link'], 'author' => $activity['author'], 'url' => $item['uri']]);
660                                         continue;
661                                 }
662                         }
663
664                         $is_forum = false;
665
666                         if ($receiver != 0) {
667                                 $user = User::getById($receiver, ['account-type']);
668                                 if (!empty($user['account-type'])) {
669                                         $is_forum = ($user['account-type'] == User::ACCOUNT_TYPE_COMMUNITY);
670                                 }
671                         }
672
673                         if (!$is_forum && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') == Item::COMPLETION_NONE && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
674                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
675
676                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
677                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
678                                 }
679
680                                 if ($skip) {
681                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
682                                         continue;
683                                 }
684
685                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
686                         }
687
688                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
689                                 $event_id = self::createEvent($activity, $item);
690
691                                 $item = Event::getItemArrayForImportedId($event_id, $item);
692                         }
693
694                         $item_id = Item::insert($item);
695                         if ($item_id) {
696                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
697                         } else {
698                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
699                         }
700
701                         if ($item['uid'] == 0) {
702                                 $stored = $item_id;
703                         }
704                 }
705
706                 // Store send a follow request for every reshare - but only when the item had been stored
707                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
708                         $author = APContact::getByURL($item['owner-link'], false);
709                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
710                         if ($author['type'] != 'Group') {
711                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
712                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
713                         }
714                 }
715         }
716
717         /**
718          * Store tags and mentions into the tag table
719          *
720          * @param integer $uriid
721          * @param array $tags
722          */
723         private static function storeTags(int $uriid, array $tags = null)
724         {
725                 foreach ($tags as $tag) {
726                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
727                                 continue;
728                         }
729
730                         $hash = substr($tag['name'], 0, 1);
731
732                         if ($tag['type'] == 'Mention') {
733                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
734                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
735                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
736                                         $tag['name'] = substr($tag['name'], 1);
737                                 }
738                                 $type = Tag::IMPLICIT_MENTION;
739
740                                 if (!empty($tag['href'])) {
741                                         $apcontact = APContact::getByURL($tag['href']);
742                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
743                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
744                                         }
745                                 }
746                         } elseif ($tag['type'] == 'Hashtag') {
747                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
748                                         $tag['name'] = substr($tag['name'], 1);
749                                 }
750                                 $type = Tag::HASHTAG;
751                         }
752
753                         if (empty($tag['name'])) {
754                                 continue;
755                         }
756
757                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
758                 }
759         }
760
761         public static function storeReceivers(int $uriid, array $receivers)
762         {
763                 foreach (['as:to' => Tag::TO, 'as:cc' => Tag::CC, 'as:bto' => Tag::BTO, 'as:bcc' => Tag::BCC] as $element => $type) {
764                         if (!empty($receivers[$element])) {
765                                 foreach ($receivers[$element] as $receiver) {
766                                         if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
767                                                 $name = Receiver::PUBLIC_COLLECTION;
768                                         } else {
769                                                 $name = trim(parse_url($receiver, PHP_URL_PATH), '/');
770                                         }
771                                         Tag::store($uriid, $type, $name, $receiver);
772                                 }
773                         }
774                 }
775         }
776
777         /**
778          * Creates an mail post
779          *
780          * @param array $activity Activity data
781          * @param array $item     item array
782          * @return int|bool New mail table row id or false on error
783          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
784          */
785         private static function postMail($activity, $item)
786         {
787                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
788                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
789                         return false;
790                 }
791
792                 Logger::info('Direct Message', $item);
793
794                 $msg = [];
795                 $msg['uid'] = $item['uid'];
796
797                 $msg['contact-id'] = $item['contact-id'];
798
799                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
800                 $msg['from-name'] = $contact['name'];
801                 $msg['from-url'] = $contact['url'];
802                 $msg['from-photo'] = $contact['photo'];
803
804                 $msg['uri'] = $item['uri'];
805                 $msg['created'] = $item['created'];
806
807                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
808                 if (DBA::isResult($parent)) {
809                         $msg['parent-uri'] = $parent['parent-uri'];
810                         $msg['title'] = $parent['title'];
811                 } else {
812                         $msg['parent-uri'] = $item['thr-parent'];
813
814                         if (!empty($item['title'])) {
815                                 $msg['title'] = $item['title'];
816                         } elseif (!empty($item['content-warning'])) {
817                                 $msg['title'] = $item['content-warning'];
818                         } else {
819                                 // Trying to generate a title out of the body
820                                 $title = $item['body'];
821
822                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
823                                         $title = $matches[3];
824                                 }
825
826                                 $title = trim(BBCode::toPlaintext($title));
827
828                                 if (strlen($title) > 20) {
829                                         $title = substr($title, 0, 20) . '...';
830                                 }
831
832                                 $msg['title'] = $title;
833                         }
834                 }
835                 $msg['body'] = $item['body'];
836
837                 return Mail::insert($msg);
838         }
839
840         /**
841          * Fetches missing posts
842          *
843          * @param string $url         message URL
844          * @param array  $child       activity array with the child of this message
845          * @param string $relay_actor Relay actor
846          * @return string fetched message URL
847          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
848          */
849         public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
850         {
851                 if (!empty($child['receiver'])) {
852                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
853                 } else {
854                         $uid = 0;
855                 }
856
857                 $object = ActivityPub::fetchContent($url, $uid);
858                 if (empty($object)) {
859                         Logger::notice('Activity was not fetchable, aborting.', ['url' => $url]);
860                         return '';
861                 }
862
863                 if (empty($object['id'])) {
864                         Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
865                         return '';
866                 }
867
868                 if (!empty($object['actor'])) {
869                         $object_actor = $object['actor'];
870                 } elseif (!empty($object['attributedTo'])) {
871                         $object_actor = $object['attributedTo'];
872                         if (is_array($object_actor)) {
873                                 $compacted = JsonLD::compact($object);
874                                 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
875                         }
876                 } else {
877                         // Shouldn't happen
878                         $object_actor = '';
879                 }
880
881                 $signer = [$object_actor];
882
883                 if (!empty($child['author'])) {
884                         $actor = $child['author'];
885                         $signer[] = $actor;
886                 } else {
887                         $actor = $object_actor;
888                 }
889
890                 if (!empty($object['published'])) {
891                         $published = $object['published'];
892                 } elseif (!empty($child['published'])) {
893                         $published = $child['published'];
894                 } else {
895                         $published = DateTimeFormat::utcNow();
896                 }
897
898                 $activity = [];
899                 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
900                 unset($object['@context']);
901                 $activity['id'] = $object['id'];
902                 $activity['to'] = $object['to'] ?? [];
903                 $activity['cc'] = $object['cc'] ?? [];
904                 $activity['actor'] = $actor;
905                 $activity['object'] = $object;
906                 $activity['published'] = $published;
907                 $activity['type'] = 'Create';
908
909                 $ldactivity = JsonLD::compact($activity);
910
911                 if (!empty($relay_actor)) {
912                         $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
913                 } elseif (!empty($child['thread-completion'])) {
914                         $ldactivity['thread-completion'] = $child['thread-completion'];
915                 } else {
916                         $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
917                 }
918
919                 if (!empty($child['type'])) {
920                         $ldactivity['thread-children-type'] = $child['type'];
921                 }
922
923                 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
924                         return '';
925                 }
926
927                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
928
929                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
930
931                 return $activity['id'];
932         }
933
934         /**
935          * Test if incoming relay messages should be accepted
936          *
937          * @param array $activity activity array
938          * @param string $id      object ID
939          * @return boolean true if message is accepted
940          */
941         private static function acceptIncomingMessage(array $activity, string $id)
942         {
943                 if (empty($activity['as:object'])) {
944                         Logger::info('No object field in activity - accepted', ['id' => $id]);
945                         return true;
946                 }
947
948                 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
949                 $uriid = ItemURI::getIdByURI($replyto);
950                 if (Post::exists(['uri-id' => $uriid])) {
951                         Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
952                         return true;
953                 }
954
955                 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
956                 $authorid = Contact::getIdForURL($attributed_to);
957
958                 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
959
960                 $messageTags = [];
961                 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
962                 if (!empty($tags)) {
963                         foreach ($tags as $tag) {
964                                 if ($tag['type'] != 'Hashtag') {
965                                         continue;
966                                 }
967                                 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
968                         }
969                 }
970
971                 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
972         }
973
974         /**
975          * perform a "follow" request
976          *
977          * @param array $activity
978          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
979          * @throws \ImagickException
980          */
981         public static function followUser($activity)
982         {
983                 $uid = User::getIdForURL($activity['object_id']);
984                 if (empty($uid)) {
985                         return;
986                 }
987
988                 $owner = User::getOwnerDataById($uid);
989                 if (empty($owner)) {
990                         return;
991                 }
992
993                 $cid = Contact::getIdForURL($activity['actor'], $uid);
994                 if (!empty($cid)) {
995                         self::switchContact($cid);
996                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
997                 }
998
999                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
1000                         'author-link' => $activity['actor']];
1001
1002                 // Ensure that the contact has got the right network type
1003                 self::switchContact($item['author-id']);
1004
1005                 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
1006                 if ($result === true) {
1007                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
1008                 }
1009
1010                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1011                 if (empty($cid)) {
1012                         return;
1013                 }
1014
1015                 if (empty($contact)) {
1016                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
1017                 }
1018
1019                 Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
1020         }
1021
1022         /**
1023          * Update the given profile
1024          *
1025          * @param array $activity
1026          * @throws \Exception
1027          */
1028         public static function updatePerson($activity)
1029         {
1030                 if (empty($activity['object_id'])) {
1031                         return;
1032                 }
1033
1034                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
1035                 Contact::updateFromProbeByURL($activity['object_id']);
1036         }
1037
1038         /**
1039          * Delete the given profile
1040          *
1041          * @param array $activity
1042          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1043          */
1044         public static function deletePerson($activity)
1045         {
1046                 if (empty($activity['object_id']) || empty($activity['actor'])) {
1047                         Logger::info('Empty object id or actor.');
1048                         return;
1049                 }
1050
1051                 if ($activity['object_id'] != $activity['actor']) {
1052                         Logger::info('Object id does not match actor.');
1053                         return;
1054                 }
1055
1056                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
1057                 while ($contact = DBA::fetch($contacts)) {
1058                         Contact::remove($contact['id']);
1059                 }
1060                 DBA::close($contacts);
1061
1062                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
1063         }
1064
1065         /**
1066          * Accept a follow request
1067          *
1068          * @param array $activity
1069          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1070          * @throws \ImagickException
1071          */
1072         public static function acceptFollowUser($activity)
1073         {
1074                 $uid = User::getIdForURL($activity['object_actor']);
1075                 if (empty($uid)) {
1076                         return;
1077                 }
1078
1079                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1080                 if (empty($cid)) {
1081                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1082                         return;
1083                 }
1084
1085                 self::switchContact($cid);
1086
1087                 $fields = ['pending' => false];
1088
1089                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1090                 if ($contact['rel'] == Contact::FOLLOWER) {
1091                         $fields['rel'] = Contact::FRIEND;
1092                 }
1093
1094                 $condition = ['id' => $cid];
1095                 Contact::update($fields, $condition);
1096                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1097         }
1098
1099         /**
1100          * Reject a follow request
1101          *
1102          * @param array $activity
1103          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1104          * @throws \ImagickException
1105          */
1106         public static function rejectFollowUser($activity)
1107         {
1108                 $uid = User::getIdForURL($activity['object_actor']);
1109                 if (empty($uid)) {
1110                         return;
1111                 }
1112
1113                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1114                 if (empty($cid)) {
1115                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1116                         return;
1117                 }
1118
1119                 self::switchContact($cid);
1120
1121                 $contact = Contact::getById($cid, ['rel']);
1122                 if ($contact['rel'] == Contact::SHARING) {
1123                         Contact::remove($cid);
1124                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1125                 } elseif ($contact['rel'] == Contact::FRIEND) {
1126                         Contact::update(['rel' => Contact::FOLLOWER], ['id' => $cid]);
1127                 } else {
1128                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1129                 }
1130         }
1131
1132         /**
1133          * Undo activity like "like" or "dislike"
1134          *
1135          * @param array $activity
1136          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1137          * @throws \ImagickException
1138          */
1139         public static function undoActivity($activity)
1140         {
1141                 if (empty($activity['object_id'])) {
1142                         return;
1143                 }
1144
1145                 if (empty($activity['object_actor'])) {
1146                         return;
1147                 }
1148
1149                 $author_id = Contact::getIdForURL($activity['object_actor']);
1150                 if (empty($author_id)) {
1151                         return;
1152                 }
1153
1154                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1155         }
1156
1157         /**
1158          * Activity to remove a follower
1159          *
1160          * @param array $activity
1161          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1162          * @throws \ImagickException
1163          */
1164         public static function undoFollowUser($activity)
1165         {
1166                 $uid = User::getIdForURL($activity['object_object']);
1167                 if (empty($uid)) {
1168                         return;
1169                 }
1170
1171                 $owner = User::getOwnerDataById($uid);
1172                 if (empty($owner)) {
1173                         return;
1174                 }
1175
1176                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1177                 if (empty($cid)) {
1178                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1179                         return;
1180                 }
1181
1182                 self::switchContact($cid);
1183
1184                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1185                 if (!DBA::isResult($contact)) {
1186                         return;
1187                 }
1188
1189                 Contact::removeFollower($contact);
1190                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1191         }
1192
1193         /**
1194          * Switches a contact to AP if needed
1195          *
1196          * @param integer $cid Contact ID
1197          * @throws \Exception
1198          */
1199         private static function switchContact($cid)
1200         {
1201                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1202                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1203                         return;
1204                 }
1205
1206                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1207                 Contact::updateFromProbe($cid);
1208         }
1209
1210         /**
1211          * Collects implicit mentions like:
1212          * - the author of the parent item
1213          * - all the mentioned conversants in the parent item
1214          *
1215          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1216          * @return array
1217          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1218          */
1219         private static function getImplicitMentionList(array $parent)
1220         {
1221                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1222
1223                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1224
1225                 $implicit_mentions = [];
1226                 if (empty($parent_author['url'])) {
1227                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1228                 } else {
1229                         $implicit_mentions[] = $parent_author['url'];
1230                         $implicit_mentions[] = $parent_author['nurl'];
1231                         $implicit_mentions[] = $parent_author['alias'];
1232                 }
1233
1234                 if (!empty($parent['alias'])) {
1235                         $implicit_mentions[] = $parent['alias'];
1236                 }
1237
1238                 foreach ($parent_terms as $term) {
1239                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1240                         if (!empty($contact['url'])) {
1241                                 $implicit_mentions[] = $contact['url'];
1242                                 $implicit_mentions[] = $contact['nurl'];
1243                                 $implicit_mentions[] = $contact['alias'];
1244                         }
1245                 }
1246
1247                 return $implicit_mentions;
1248         }
1249
1250         /**
1251          * Strips from the body prepended implicit mentions
1252          *
1253          * @param string $body
1254          * @param array $parent
1255          * @return string
1256          */
1257         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1258         {
1259                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1260                         return $body;
1261                 }
1262
1263                 $potential_mentions = self::getImplicitMentionList($parent);
1264
1265                 $kept_mentions = [];
1266
1267                 // Extract one prepended mention at a time from the body
1268                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1269                         if (!in_array($matches[2], $potential_mentions)) {
1270                                 $kept_mentions[] = $matches[1];
1271                         }
1272
1273                         $body = $matches[3];
1274                 }
1275
1276                 // Re-appending the kept mentions to the body after extraction
1277                 $kept_mentions[] = $body;
1278
1279                 return implode('', $kept_mentions);
1280         }
1281
1282         /**
1283          * Adds links to string mentions
1284          *
1285          * @param string $body
1286          * @param array  $tags
1287          * @return string
1288          */
1289         protected static function addMentionLinks(string $body, array $tags): string
1290         {
1291                 // This prevents links to be added again to Pleroma-style mention links
1292                 $body = self::normalizeMentionLinks($body);
1293
1294                 $body = BBCode::performWithEscapedTags($body, ['url'], function ($body) use ($tags) {
1295                         foreach ($tags as $tag) {
1296                                 if (empty($tag['name']) || empty($tag['type']) || empty($tag['href']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
1297                                         continue;
1298                                 }
1299
1300                                 $hash = substr($tag['name'], 0, 1);
1301                                 $name = substr($tag['name'], 1);
1302                                 if (!in_array($hash, Tag::TAG_CHARACTER)) {
1303                                         $hash = '';
1304                                         $name = $tag['name'];
1305                                 }
1306
1307                                 $body = str_replace($tag['name'], $hash . '[url=' . $tag['href'] . ']' . $name . '[/url]', $body);
1308                         }
1309
1310                         return $body;
1311                 });
1312
1313                 return $body;
1314         }
1315 }