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