src/Protocol/ActivityPub/Processor.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   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\Core\Logger;
  27 use Friendica\Core\Protocol;
  28 use Friendica\Database\DBA;
  29 use Friendica\DI;
  30 use Friendica\Model\APContact;
  31 use Friendica\Model\Contact;
  32 use Friendica\Model\Conversation;
  33 use Friendica\Model\Event;
  34 use Friendica\Model\Item;
  35 use Friendica\Model\ItemURI;
  36 use Friendica\Model\Mail;
  37 use Friendica\Model\Tag;
  38 use Friendica\Model\User;
  39 use Friendica\Protocol\Activity;
  40 use Friendica\Protocol\ActivityPub;
  41 use Friendica\Util\DateTimeFormat;
  42 use Friendica\Util\JsonLD;
  43 use Friendica\Util\Strings;
  44
  45 /**
  46  * ActivityPub Processor Protocol class
  47  */
  48 class Processor
  49 {
  50         /**
  51          * Converts mentions from Pleroma into the Friendica format
  52          *
  53          * @param string $body
  54          *
  55          * @return string converted body
  56          */
  57         private static function convertMentions($body)
  58         {
  59                 $URLSearchString = "^\[\]";
  60                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
  61
  62                 return $body;
  63         }
  64
  65         /**
  66          * Replaces emojis in the body
  67          *
  68          * @param array $emojis
  69          * @param string $body
  70          *
  71          * @return string with replaced emojis
  72          */
  73         private static function replaceEmojis($body, array $emojis)
  74         {
  75                 foreach ($emojis as $emoji) {
  76                         $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
  77                         $body = str_replace($emoji['name'], $replace, $body);
  78                 }
  79                 return $body;
  80         }
  81
  82         /**
  83          * Add attachment data to the item array
  84          *
  85          * @param array   $activity
  86          * @param array   $item
  87          *
  88          * @return array array
  89          */
  90         private static function constructAttachList($activity, $item)
  91         {
  92                 if (empty($activity['attachments'])) {
  93                         return $item;
  94                 }
  95
  96                 foreach ($activity['attachments'] as $attach) {
  97                         switch ($attach['type']) {
  98                                 case 'link':
  99                                         // Only one [attachment] tag is allowed
 100                                         $existingAttachmentPos = strpos($item['body'], '[attachment');
 101                                         if ($existingAttachmentPos !== false) {
 102                                                 $linkTitle = $attach['title'] ?: $attach['url'];
 103                                                 // Additional link attachments are prepended before the existing [attachment] tag
 104                                                 $item['body'] = substr_replace($item['body'], "\n[bookmark=" . $attach['url'] . ']' . $linkTitle . "[/bookmark]\n", $existingAttachmentPos, 0);
 105                                         } else {
 106                                                 // Strip the link preview URL from the end of the body if any
 107                                                 $quotedUrl = preg_quote($attach['url'], '#');
 108                                                 $item['body'] = preg_replace("#\s*(?:\[bookmark={$quotedUrl}].+?\[/bookmark]|\[url={$quotedUrl}].+?\[/url]|\[url]{$quotedUrl}\[/url]|{$quotedUrl})\s*$#", '', $item['body']);
 109                                                 $item['body'] .= "\n[attachment type='link' url='" . $attach['url'] . "' title='" . htmlspecialchars($attach['title'] ?? '', ENT_QUOTES) . "' image='" . ($attach['image'] ?? '') . "']" . ($attach['desc'] ?? '') . '[/attachment]';
 110                                         }
 111                                         break;
 112                                 default:
 113                                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 114                                         if ($filetype == 'image') {
 115                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 116                                                         continue 2;
 117                                                 }
 118
 119                                                 if (empty($attach['name'])) {
 120                                                         $item['body'] .= "\n[img]" . $attach['url'] . '[/img]';
 121                                                 } else {
 122                                                         $item['body'] .= "\n[img=" . $attach['url'] . ']' . $attach['name'] . '[/img]';
 123                                                 }
 124                                         } elseif ($filetype == 'audio') {
 125                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 126                                                         continue 2;
 127                                                 }
 128
 129                                                 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
 130                                         } elseif ($filetype == 'video') {
 131                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 132                                                         continue 2;
 133                                                 }
 134
 135                                                 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
 136                                         } else {
 137                                                 if (!empty($item["attach"])) {
 138                                                         $item["attach"] .= ',';
 139                                                 } else {
 140                                                         $item["attach"] = '';
 141                                                 }
 142
 143                                                 $item["attach"] .= '[attach]href="' . $attach['url'] . '" length="' . ($attach['length'] ?? '0') . '" type="' . $attach['mediaType'] . '" title="' . ($attach['name'] ?? '') . '"[/attach]';
 144                                         }
 145                         }
 146                 }
 147
 148                 return $item;
 149         }
 150
 151         /**
 152          * Updates a message
 153          *
 154          * @param array $activity Activity array
 155          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 156          */
 157         public static function updateItem($activity)
 158         {
 159                 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
 160                 if (!DBA::isResult($item)) {
 161                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 162                         self::createItem($activity);
 163                         return;
 164                 }
 165
 166                 $item['changed'] = DateTimeFormat::utcNow();
 167                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 168
 169                 $item = self::processContent($activity, $item);
 170                 if (empty($item)) {
 171                         return;
 172                 }
 173
 174                 Item::update($item, ['uri' => $activity['id']]);
 175         }
 176
 177         /**
 178          * Prepares data for a message
 179          *
 180          * @param array $activity Activity array
 181          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 182          * @throws \ImagickException
 183          */
 184         public static function createItem($activity)
 185         {
 186                 $item = [];
 187                 $item['verb'] = Activity::POST;
 188                 $item['thr-parent'] = $activity['reply-to-id'];
 189
 190                 if ($activity['reply-to-id'] == $activity['id']) {
 191                         $item['gravity'] = GRAVITY_PARENT;
 192                         $item['object-type'] = Activity\ObjectType::NOTE;
 193                 } else {
 194                         $item['gravity'] = GRAVITY_COMMENT;
 195                         $item['object-type'] = Activity\ObjectType::COMMENT;
 196
 197                         // Ensure that the comment reaches all receivers of the referring post
 198                         $activity['receiver'] = self::addReceivers($activity);
 199                 }
 200
 201                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
 202                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
 203                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 204                 }
 205
 206                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 207
 208                 self::postItem($activity, $item);
 209         }
 210
 211         /**
 212          * Delete items
 213          *
 214          * @param array $activity
 215          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 216          * @throws \ImagickException
 217          */
 218         public static function deleteItem($activity)
 219         {
 220                 $owner = Contact::getIdForURL($activity['actor']);
 221
 222                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 223                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 224         }
 225
 226         /**
 227          * Prepare the item array for an activity
 228          *
 229          * @param array $activity Activity array
 230          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 231          * @throws \ImagickException
 232          */
 233         public static function addTag($activity)
 234         {
 235                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 236                         return;
 237                 }
 238
 239                 foreach ($activity['receiver'] as $receiver) {
 240                         $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 241                         if (!DBA::isResult($item)) {
 242                                 // We don't fetch missing content for this purpose
 243                                 continue;
 244                         }
 245
 246                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 247                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 248                                 continue;
 249                         }
 250
 251                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 252                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 253                 }
 254         }
 255
 256         /**
 257          * Add users to the receiver list of the given public activity.
 258          * This is used to ensure that the activity will be stored in every thread.
 259          *
 260          * @param array $activity Activity array
 261          * @return array Modified receiver list
 262          */
 263         private static function addReceivers(array $activity)
 264         {
 265                 if (!in_array(0, $activity['receiver'])) {
 266                         // Private activities will not be modified
 267                         return $activity['receiver'];
 268                 }
 269
 270                 // Add all owners of the referring item to the receivers
 271                 $original = $receivers = $activity['receiver'];
 272                 $items = Item::select(['uid'], ['uri' => $activity['object_id']]);
 273                 while ($item = DBA::fetch($items)) {
 274                         $receivers['uid:' . $item['uid']] = $item['uid'];
 275                 }
 276                 DBA::close($items);
 277
 278                 if (count($original) != count($receivers)) {
 279                         Logger::info('Improved data', ['id' => $activity['id'], 'object' => $activity['object_id'], 'original' => $original, 'improved' => $receivers]);
 280                 }
 281
 282                 return $receivers;
 283         }
 284
 285         /**
 286          * Prepare the item array for an activity
 287          *
 288          * @param array  $activity Activity array
 289          * @param string $verb     Activity verb
 290          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 291          * @throws \ImagickException
 292          */
 293         public static function createActivity($activity, $verb)
 294         {
 295                 $item = [];
 296                 $item['verb'] = $verb;
 297                 $item['thr-parent'] = $activity['object_id'];
 298                 $item['gravity'] = GRAVITY_ACTIVITY;
 299                 $item['object-type'] = Activity\ObjectType::NOTE;
 300
 301                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 302
 303                 $activity['receiver'] = self::addReceivers($activity);
 304
 305                 self::postItem($activity, $item);
 306         }
 307
 308         /**
 309          * Create an event
 310          *
 311          * @param array $activity Activity array
 312          * @param array $item
 313          * @throws \Exception
 314          */
 315         public static function createEvent($activity, $item)
 316         {
 317                 $event['summary']  = HTML::toBBCode($activity['name']);
 318                 $event['desc']     = HTML::toBBCode($activity['content']);
 319                 $event['start']    = $activity['start-time'];
 320                 $event['finish']   = $activity['end-time'];
 321                 $event['nofinish'] = empty($event['finish']);
 322                 $event['location'] = $activity['location'];
 323                 $event['adjust']   = true;
 324                 $event['cid']      = $item['contact-id'];
 325                 $event['uid']      = $item['uid'];
 326                 $event['uri']      = $item['uri'];
 327                 $event['edited']   = $item['edited'];
 328                 $event['private']  = $item['private'];
 329                 $event['guid']     = $item['guid'];
 330                 $event['plink']    = $item['plink'];
 331
 332                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 333                 $ev = DBA::selectFirst('event', ['id'], $condition);
 334                 if (DBA::isResult($ev)) {
 335                         $event['id'] = $ev['id'];
 336                 }
 337
 338                 $event_id = Event::store($event);
 339                 Logger::info('Event was stored', ['id' => $event_id]);
 340         }
 341
 342         /**
 343          * Process the content
 344          *
 345          * @param array $activity Activity array
 346          * @param array $item
 347          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 348          * @throws \Exception
 349          */
 350         private static function processContent($activity, $item)
 351         {
 352                 $item['title'] = HTML::toBBCode($activity['name']);
 353
 354                 if (!empty($activity['source'])) {
 355                         $item['body'] = $activity['source'];
 356                 } else {
 357                         $content = HTML::toBBCode($activity['content']);
 358
 359                         if (!empty($activity['emojis'])) {
 360                                 $content = self::replaceEmojis($content, $activity['emojis']);
 361                         }
 362
 363                         $content = self::convertMentions($content);
 364
 365                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 366                                 $item_private = !in_array(0, $activity['item_receiver']);
 367                                 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 368                                 if (!DBA::isResult($parent)) {
 369                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 370                                         return false;
 371                                 }
 372                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
 373                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 374                                         return false;
 375                                 }
 376
 377                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 378                         }
 379                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
 380                         $item['body'] = $content;
 381                 }
 382
 383                 self::storeFromBody($item);
 384                 self::storeTags($item['uri-id'], $activity['tags']);
 385
 386                 $item['location'] = $activity['location'];
 387
 388                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 389                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 390                 }
 391
 392                 $item['app'] = $activity['generator'];
 393
 394                 return $item;
 395         }
 396
 397         /**
 398          * Store hashtags and mentions
 399          *
 400          * @param array $item
 401          */
 402         private static function storeFromBody(array $item)
 403         {
 404                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 405                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 406
 407                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 408         }
 409
 410         /**
 411          * Generate a GUID out of an URL
 412          *
 413          * @param string $url message URL
 414          * @return string with GUID
 415          */
 416         private static function getGUIDByURL(string $url)
 417         {
 418                 $parsed = parse_url($url);
 419
 420                 $host_hash = hash('crc32', $parsed['host']);
 421
 422                 unset($parsed["scheme"]);
 423                 unset($parsed["host"]);
 424
 425                 $path = implode("/", $parsed);
 426
 427                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 428         }
 429
 430         /**
 431          * Creates an item post
 432          *
 433          * @param array $activity Activity data
 434          * @param array $item     item array
 435          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 436          * @throws \ImagickException
 437          */
 438         private static function postItem($activity, $item)
 439         {
 440                 /// @todo What to do with $activity['context']?
 441                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
 442                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 443                         return;
 444                 }
 445
 446                 $item['network'] = Protocol::ACTIVITYPUB;
 447                 $item['author-link'] = $activity['author'];
 448                 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
 449                 $item['owner-link'] = $activity['actor'];
 450                 $item['owner-id'] = Contact::getIdForURL($activity['actor'], 0, true);
 451
 452                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 453                         $item['private'] = Item::UNLISTED;
 454                 } elseif (in_array(0, $activity['receiver'])) {
 455                         $item['private'] = Item::PUBLIC;
 456                 } else {
 457                         $item['private'] = Item::PRIVATE;
 458                 }
 459
 460                 if (!empty($activity['raw'])) {
 461                         $item['source'] = $activity['raw'];
 462                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 463                         $item['conversation-href'] = $activity['context'] ?? '';
 464                         $item['conversation-uri'] = $activity['conversation'] ?? '';
 465
 466                         if (isset($activity['push'])) {
 467                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 468                         }
 469                 }
 470
 471                 $isForum = false;
 472
 473                 if (!empty($activity['thread-completion'])) {
 474                         // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 475                         $item['causer-link'] = $item['owner-link'];
 476                         $item['causer-id'] = $item['owner-id'];
 477
 478                         Logger::info('Ignoring actor because of thread completion.', ['actor' => $item['owner-link']]);
 479                         $item['owner-link'] = $item['author-link'];
 480                         $item['owner-id'] = $item['author-id'];
 481                 } else {
 482                         $actor = APContact::getByURL($item['owner-link'], false);
 483                         $isForum = ($actor['type'] == 'Group');
 484                 }
 485
 486                 $item['uri'] = $activity['id'];
 487
 488                 $item['created'] = DateTimeFormat::utc($activity['published']);
 489                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 490                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 491                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 492
 493                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 494
 495                 $item = self::processContent($activity, $item);
 496                 if (empty($item)) {
 497                         return;
 498                 }
 499
 500                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 501
 502                 $item = self::constructAttachList($activity, $item);
 503
 504                 $stored = false;
 505
 506                 foreach ($activity['receiver'] as $receiver) {
 507                         if ($receiver == -1) {
 508                                 continue;
 509                         }
 510
 511                         $item['uid'] = $receiver;
 512
 513                         if ($isForum) {
 514                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver, true);
 515                         } else {
 516                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
 517                         }
 518
 519                         if (($receiver != 0) && empty($item['contact-id'])) {
 520                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
 521                         }
 522
 523                         if (!empty($activity['directmessage'])) {
 524                                 self::postMail($activity, $item);
 525                                 continue;
 526                         }
 527
 528                         if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 529                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 530
 531                                 if ($skip && (($activity['type'] == 'as:Announce') || $isForum)) {
 532                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 533                                 }
 534
 535                                 if ($skip) {
 536                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 537                                         continue;
 538                                 }
 539
 540                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 541                         }
 542
 543                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 544                                 self::createEvent($activity, $item);
 545                         }
 546
 547                         $item_id = Item::insert($item);
 548                         if ($item_id) {
 549                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 550                         } else {
 551                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 552                         }
 553
 554                         if ($item['uid'] == 0) {
 555                                 $stored = $item_id;
 556                         }
 557                 }
 558
 559                 // Store send a follow request for every reshare - but only when the item had been stored
 560                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 561                         $author = APContact::getByURL($item['owner-link'], false);
 562                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 563                         if ($author['type'] != 'Group') {
 564                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 565                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 566                         }
 567                 }
 568         }
 569
 570         /**
 571          * Store tags and mentions into the tag table
 572          *
 573          * @param integer $uriid
 574          * @param array $tags
 575          */
 576         private static function storeTags(int $uriid, array $tags = null)
 577         {
 578                 foreach ($tags as $tag) {
 579                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 580                                 continue;
 581                         }
 582
 583                         $hash = substr($tag['name'], 0, 1);
 584
 585                         if ($tag['type'] == 'Mention') {
 586                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
 587                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
 588                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
 589                                         $tag['name'] = substr($tag['name'], 1);
 590                                 }
 591                                 $type = Tag::IMPLICIT_MENTION;
 592
 593                                 if (!empty($tag['href'])) {
 594                                         $apcontact = APContact::getByURL($tag['href']);
 595                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
 596                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
 597                                         }
 598                                 }
 599                         } elseif ($tag['type'] == 'Hashtag') {
 600                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
 601                                         $tag['name'] = substr($tag['name'], 1);
 602                                 }
 603                                 $type = Tag::HASHTAG;
 604                         }
 605
 606                         if (empty($tag['name'])) {
 607                                 continue;
 608                         }
 609
 610                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
 611                 }
 612         }
 613
 614         /**
 615          * Creates an mail post
 616          *
 617          * @param array $activity Activity data
 618          * @param array $item     item array
 619          * @return int|bool New mail table row id or false on error
 620          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 621          */
 622         private static function postMail($activity, $item)
 623         {
 624                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
 625                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
 626                         return false;
 627                 }
 628
 629                 Logger::info('Direct Message', $item);
 630
 631                 $msg = [];
 632                 $msg['uid'] = $item['uid'];
 633
 634                 $msg['contact-id'] = $item['contact-id'];
 635
 636                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
 637                 $msg['from-name'] = $contact['name'];
 638                 $msg['from-url'] = $contact['url'];
 639                 $msg['from-photo'] = $contact['photo'];
 640
 641                 $msg['uri'] = $item['uri'];
 642                 $msg['created'] = $item['created'];
 643
 644                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
 645                 if (DBA::isResult($parent)) {
 646                         $msg['parent-uri'] = $parent['parent-uri'];
 647                         $msg['title'] = $parent['title'];
 648                 } else {
 649                         $msg['parent-uri'] = $item['thr-parent'];
 650
 651                         if (!empty($item['title'])) {
 652                                 $msg['title'] = $item['title'];
 653                         } elseif (!empty($item['content-warning'])) {
 654                                 $msg['title'] = $item['content-warning'];
 655                         } else {
 656                                 // Trying to generate a title out of the body
 657                                 $title = $item['body'];
 658
 659                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
 660                                         $title = $matches[3];
 661                                 }
 662
 663                                 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
 664
 665                                 if (strlen($title) > 20) {
 666                                         $title = substr($title, 0, 20) . '...';
 667                                 }
 668
 669                                 $msg['title'] = $title;
 670                         }
 671                 }
 672                 $msg['body'] = $item['body'];
 673
 674                 return Mail::insert($msg);
 675         }
 676
 677         /**
 678          * Fetches missing posts
 679          *
 680          * @param string $url message URL
 681          * @param array $child activity array with the child of this message
 682          * @return string fetched message URL
 683          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 684          */
 685         public static function fetchMissingActivity($url, $child = [])
 686         {
 687                 if (!empty($child['receiver'])) {
 688                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 689                 } else {
 690                         $uid = 0;
 691                 }
 692
 693                 $object = ActivityPub::fetchContent($url, $uid);
 694                 if (empty($object)) {
 695                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 696                         return '';
 697                 }
 698
 699                 if (empty($object['id'])) {
 700                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 701                         return '';
 702                 }
 703
 704                 if (!empty($child['author'])) {
 705                         $actor = $child['author'];
 706                 } elseif (!empty($object['actor'])) {
 707                         $actor = $object['actor'];
 708                 } elseif (!empty($object['attributedTo'])) {
 709                         $actor = $object['attributedTo'];
 710                 } else {
 711                         // Shouldn't happen
 712                         $actor = '';
 713                 }
 714
 715                 if (!empty($object['published'])) {
 716                         $published = $object['published'];
 717                 } elseif (!empty($child['published'])) {
 718                         $published = $child['published'];
 719                 } else {
 720                         $published = DateTimeFormat::utcNow();
 721                 }
 722
 723                 $activity = [];
 724                 $activity['@context'] = $object['@context'];
 725                 unset($object['@context']);
 726                 $activity['id'] = $object['id'];
 727                 $activity['to'] = $object['to'] ?? [];
 728                 $activity['cc'] = $object['cc'] ?? [];
 729                 $activity['actor'] = $actor;
 730                 $activity['object'] = $object;
 731                 $activity['published'] = $published;
 732                 $activity['type'] = 'Create';
 733
 734                 $ldactivity = JsonLD::compact($activity);
 735
 736                 $ldactivity['thread-completion'] = true;
 737
 738                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity));
 739
 740                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
 741
 742                 return $activity['id'];
 743         }
 744
 745         /**
 746          * perform a "follow" request
 747          *
 748          * @param array $activity
 749          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 750          * @throws \ImagickException
 751          */
 752         public static function followUser($activity)
 753         {
 754                 $uid = User::getIdForURL($activity['object_id']);
 755                 if (empty($uid)) {
 756                         return;
 757                 }
 758
 759                 $owner = User::getOwnerDataById($uid);
 760
 761                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 762                 if (!empty($cid)) {
 763                         self::switchContact($cid);
 764                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 765                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 766                 } else {
 767                         $contact = [];
 768                 }
 769
 770                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 771                         'author-link' => $activity['actor']];
 772
 773                 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
 774
 775                 // Ensure that the contact has got the right network type
 776                 self::switchContact($item['author-id']);
 777
 778                 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
 779                 if ($result === true) {
 780                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
 781                 }
 782
 783                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 784                 if (empty($cid)) {
 785                         return;
 786                 }
 787
 788                 if (empty($contact)) {
 789                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 790                 }
 791
 792                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
 793         }
 794
 795         /**
 796          * Update the given profile
 797          *
 798          * @param array $activity
 799          * @throws \Exception
 800          */
 801         public static function updatePerson($activity)
 802         {
 803                 if (empty($activity['object_id'])) {
 804                         return;
 805                 }
 806
 807                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
 808                 Contact::updateFromProbeByURL($activity['object_id'], true);
 809         }
 810
 811         /**
 812          * Delete the given profile
 813          *
 814          * @param array $activity
 815          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 816          */
 817         public static function deletePerson($activity)
 818         {
 819                 if (empty($activity['object_id']) || empty($activity['actor'])) {
 820                         Logger::info('Empty object id or actor.');
 821                         return;
 822                 }
 823
 824                 if ($activity['object_id'] != $activity['actor']) {
 825                         Logger::info('Object id does not match actor.');
 826                         return;
 827                 }
 828
 829                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
 830                 while ($contact = DBA::fetch($contacts)) {
 831                         Contact::remove($contact['id']);
 832                 }
 833                 DBA::close($contacts);
 834
 835                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
 836         }
 837
 838         /**
 839          * Accept a follow request
 840          *
 841          * @param array $activity
 842          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 843          * @throws \ImagickException
 844          */
 845         public static function acceptFollowUser($activity)
 846         {
 847                 $uid = User::getIdForURL($activity['object_actor']);
 848                 if (empty($uid)) {
 849                         return;
 850                 }
 851
 852                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 853                 if (empty($cid)) {
 854                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 855                         return;
 856                 }
 857
 858                 self::switchContact($cid);
 859
 860                 $fields = ['pending' => false];
 861
 862                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
 863                 if ($contact['rel'] == Contact::FOLLOWER) {
 864                         $fields['rel'] = Contact::FRIEND;
 865                 }
 866
 867                 $condition = ['id' => $cid];
 868                 DBA::update('contact', $fields, $condition);
 869                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
 870         }
 871
 872         /**
 873          * Reject a follow request
 874          *
 875          * @param array $activity
 876          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 877          * @throws \ImagickException
 878          */
 879         public static function rejectFollowUser($activity)
 880         {
 881                 $uid = User::getIdForURL($activity['object_actor']);
 882                 if (empty($uid)) {
 883                         return;
 884                 }
 885
 886                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 887                 if (empty($cid)) {
 888                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 889                         return;
 890                 }
 891
 892                 self::switchContact($cid);
 893
 894                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
 895                         Contact::remove($cid);
 896                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
 897                 } else {
 898                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
 899                 }
 900         }
 901
 902         /**
 903          * Undo activity like "like" or "dislike"
 904          *
 905          * @param array $activity
 906          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 907          * @throws \ImagickException
 908          */
 909         public static function undoActivity($activity)
 910         {
 911                 if (empty($activity['object_id'])) {
 912                         return;
 913                 }
 914
 915                 if (empty($activity['object_actor'])) {
 916                         return;
 917                 }
 918
 919                 $author_id = Contact::getIdForURL($activity['object_actor']);
 920                 if (empty($author_id)) {
 921                         return;
 922                 }
 923
 924                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
 925         }
 926
 927         /**
 928          * Activity to remove a follower
 929          *
 930          * @param array $activity
 931          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 932          * @throws \ImagickException
 933          */
 934         public static function undoFollowUser($activity)
 935         {
 936                 $uid = User::getIdForURL($activity['object_object']);
 937                 if (empty($uid)) {
 938                         return;
 939                 }
 940
 941                 $owner = User::getOwnerDataById($uid);
 942
 943                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 944                 if (empty($cid)) {
 945                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 946                         return;
 947                 }
 948
 949                 self::switchContact($cid);
 950
 951                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
 952                 if (!DBA::isResult($contact)) {
 953                         return;
 954                 }
 955
 956                 Contact::removeFollower($owner, $contact);
 957                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
 958         }
 959
 960         /**
 961          * Switches a contact to AP if needed
 962          *
 963          * @param integer $cid Contact ID
 964          * @throws \Exception
 965          */
 966         private static function switchContact($cid)
 967         {
 968                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
 969                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
 970                         return;
 971                 }
 972
 973                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
 974                 Contact::updateFromProbe($cid);
 975         }
 976
 977         /**
 978          * Collects implicit mentions like:
 979          * - the author of the parent item
 980          * - all the mentioned conversants in the parent item
 981          *
 982          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
 983          * @return array
 984          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 985          */
 986         private static function getImplicitMentionList(array $parent)
 987         {
 988                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
 989
 990                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
 991
 992                 $implicit_mentions = [];
 993                 if (empty($parent_author['url'])) {
 994                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
 995                 } else {
 996                         $implicit_mentions[] = $parent_author['url'];
 997                         $implicit_mentions[] = $parent_author['nurl'];
 998                         $implicit_mentions[] = $parent_author['alias'];
 999                 }
1000
1001                 if (!empty($parent['alias'])) {
1002                         $implicit_mentions[] = $parent['alias'];
1003                 }
1004
1005                 foreach ($parent_terms as $term) {
1006                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1007                         if (!empty($contact['url'])) {
1008                                 $implicit_mentions[] = $contact['url'];
1009                                 $implicit_mentions[] = $contact['nurl'];
1010                                 $implicit_mentions[] = $contact['alias'];
1011                         }
1012                 }
1013
1014                 return $implicit_mentions;
1015         }
1016
1017         /**
1018          * Strips from the body prepended implicit mentions
1019          *
1020          * @param string $body
1021          * @param array $parent
1022          * @return string
1023          */
1024         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1025         {
1026                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1027                         return $body;
1028                 }
1029
1030                 $potential_mentions = self::getImplicitMentionList($parent);
1031
1032                 $kept_mentions = [];
1033
1034                 // Extract one prepended mention at a time from the body
1035                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1036                         if (!in_array($matches[2], $potential_mentions)) {
1037                                 $kept_mentions[] = $matches[1];
1038                         }
1039
1040                         $body = $matches[3];
1041                 }
1042
1043                 // Re-appending the kept mentions to the body after extraction
1044                 $kept_mentions[] = $body;
1045
1046                 return implode('', $kept_mentions);
1047         }
1048 }