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\PageInfo;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Content\Text\HTML;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Database\DBA;
  30 use Friendica\DI;
  31 use Friendica\Model\APContact;
  32 use Friendica\Model\Contact;
  33 use Friendica\Model\Conversation;
  34 use Friendica\Model\Event;
  35 use Friendica\Model\Item;
  36 use Friendica\Model\ItemURI;
  37 use Friendica\Model\Mail;
  38 use Friendica\Model\Tag;
  39 use Friendica\Model\User;
  40 use Friendica\Protocol\Activity;
  41 use Friendica\Protocol\ActivityPub;
  42 use Friendica\Util\DateTimeFormat;
  43 use Friendica\Util\JsonLD;
  44 use Friendica\Util\Strings;
  45
  46 /**
  47  * ActivityPub Processor Protocol class
  48  */
  49 class Processor
  50 {
  51         /**
  52          * Converts mentions from Pleroma into the Friendica format
  53          *
  54          * @param string $body
  55          *
  56          * @return string converted body
  57          */
  58         private static function convertMentions($body)
  59         {
  60                 $URLSearchString = "^\[\]";
  61                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
  62
  63                 return $body;
  64         }
  65
  66         /**
  67          * Replaces emojis in the body
  68          *
  69          * @param array $emojis
  70          * @param string $body
  71          *
  72          * @return string with replaced emojis
  73          */
  74         private static function replaceEmojis($body, array $emojis)
  75         {
  76                 foreach ($emojis as $emoji) {
  77                         $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
  78                         $body = str_replace($emoji['name'], $replace, $body);
  79                 }
  80                 return $body;
  81         }
  82
  83         /**
  84          * Add attachment data to the item array
  85          *
  86          * @param array   $activity
  87          * @param array   $item
  88          *
  89          * @return array array
  90          */
  91         private static function constructAttachList($activity, $item)
  92         {
  93                 if (empty($activity['attachments'])) {
  94                         return $item;
  95                 }
  96
  97                 foreach ($activity['attachments'] as $attach) {
  98                         switch ($attach['type']) {
  99                                 case 'link':
 100                                         $data = [
 101                                                 'url'      => $attach['url'],
 102                                                 'type'     => $attach['type'],
 103                                                 'title'    => $attach['title'] ?? '',
 104                                                 'text'     => $attach['desc']  ?? '',
 105                                                 'image'    => $attach['image'] ?? '',
 106                                                 'images'   => [],
 107                                                 'keywords' => [],
 108                                         ];
 109                                         $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
 110                                         break;
 111                                 default:
 112                                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 113                                         if ($filetype == 'image') {
 114                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 115                                                         continue 2;
 116                                                 }
 117
 118                                                 if (empty($attach['name'])) {
 119                                                         $item['body'] .= "\n[img]" . $attach['url'] . '[/img]';
 120                                                 } else {
 121                                                         $item['body'] .= "\n[img=" . $attach['url'] . ']' . $attach['name'] . '[/img]';
 122                                                 }
 123                                         } elseif ($filetype == 'audio') {
 124                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 125                                                         continue 2;
 126                                                 }
 127
 128                                                 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
 129                                         } elseif ($filetype == 'video') {
 130                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 131                                                         continue 2;
 132                                                 }
 133
 134                                                 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
 135                                         } else {
 136                                                 if (!empty($item["attach"])) {
 137                                                         $item["attach"] .= ',';
 138                                                 } else {
 139                                                         $item["attach"] = '';
 140                                                 }
 141
 142                                                 $item["attach"] .= '[attach]href="' . $attach['url'] . '" length="' . ($attach['length'] ?? '0') . '" type="' . $attach['mediaType'] . '" title="' . ($attach['name'] ?? '') . '"[/attach]';
 143                                         }
 144                         }
 145                 }
 146
 147                 return $item;
 148         }
 149
 150         /**
 151          * Updates a message
 152          *
 153          * @param array $activity Activity array
 154          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 155          */
 156         public static function updateItem($activity)
 157         {
 158                 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
 159                 if (!DBA::isResult($item)) {
 160                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 161                         $item = self::createItem($activity);
 162                         self::postItem($activity, $item);
 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 $activity Activity array
 181          * @return array Internal item
 182          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 183          * @throws \ImagickException
 184          */
 185         public static function createItem($activity)
 186         {
 187                 $item = [];
 188                 $item['verb'] = Activity::POST;
 189                 $item['thr-parent'] = $activity['reply-to-id'];
 190
 191                 if ($activity['reply-to-id'] == $activity['id']) {
 192                         $item['gravity'] = GRAVITY_PARENT;
 193                         $item['object-type'] = Activity\ObjectType::NOTE;
 194                 } else {
 195                         $item['gravity'] = GRAVITY_COMMENT;
 196                         $item['object-type'] = Activity\ObjectType::COMMENT;
 197
 198                         // Ensure that the comment reaches all receivers of the referring post
 199                         $activity['receiver'] = self::addReceivers($activity);
 200                 }
 201
 202                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
 203                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
 204                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 205                 }
 206
 207                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 208
 209                 /// @todo What to do with $activity['context']?
 210                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
 211                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 212                         return [];
 213                 }
 214
 215                 $item['network'] = Protocol::ACTIVITYPUB;
 216                 $item['author-link'] = $activity['author'];
 217                 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, false);
 218                 $item['owner-link'] = $activity['actor'];
 219                 $item['owner-id'] = Contact::getIdForURL($activity['actor'], 0, false);
 220
 221                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 222                         $item['private'] = Item::UNLISTED;
 223                 } elseif (in_array(0, $activity['receiver'])) {
 224                         $item['private'] = Item::PUBLIC;
 225                 } else {
 226                         $item['private'] = Item::PRIVATE;
 227                 }
 228
 229                 if (!empty($activity['raw'])) {
 230                         $item['source'] = $activity['raw'];
 231                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 232                         $item['conversation-href'] = $activity['context'] ?? '';
 233                         $item['conversation-uri'] = $activity['conversation'] ?? '';
 234
 235                         if (isset($activity['push'])) {
 236                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 237                         }
 238                 }
 239
 240                 $item['isForum'] = false;
 241
 242                 if (!empty($activity['thread-completion'])) {
 243                         // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 244                         $item['causer-link'] = $item['owner-link'];
 245                         $item['causer-id'] = $item['owner-id'];
 246
 247                         Logger::info('Ignoring actor because of thread completion.', ['actor' => $item['owner-link']]);
 248                         $item['owner-link'] = $item['author-link'];
 249                         $item['owner-id'] = $item['author-id'];
 250                 } else {
 251                         $actor = APContact::getByURL($item['owner-link'], false);
 252                         $item['isForum'] = ($actor['type'] == 'Group');
 253                 }
 254
 255                 $item['uri'] = $activity['id'];
 256
 257                 $item['created'] = DateTimeFormat::utc($activity['published']);
 258                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 259                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 260                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 261
 262                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 263
 264                 $item = self::processContent($activity, $item);
 265                 if (empty($item)) {
 266                         return [];
 267                 }
 268
 269                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 270
 271                 $item = self::constructAttachList($activity, $item);
 272
 273                 return $item;
 274         }
 275
 276         /**
 277          * Delete items
 278          *
 279          * @param array $activity
 280          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 281          * @throws \ImagickException
 282          */
 283         public static function deleteItem($activity)
 284         {
 285                 $owner = Contact::getIdForURL($activity['actor']);
 286
 287                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 288                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 289         }
 290
 291         /**
 292          * Prepare the item array for an activity
 293          *
 294          * @param array $activity Activity array
 295          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 296          * @throws \ImagickException
 297          */
 298         public static function addTag($activity)
 299         {
 300                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 301                         return;
 302                 }
 303
 304                 foreach ($activity['receiver'] as $receiver) {
 305                         $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 306                         if (!DBA::isResult($item)) {
 307                                 // We don't fetch missing content for this purpose
 308                                 continue;
 309                         }
 310
 311                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 312                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 313                                 continue;
 314                         }
 315
 316                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 317                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 318                 }
 319         }
 320
 321         /**
 322          * Add users to the receiver list of the given public activity.
 323          * This is used to ensure that the activity will be stored in every thread.
 324          *
 325          * @param array $activity Activity array
 326          * @return array Modified receiver list
 327          */
 328         private static function addReceivers(array $activity)
 329         {
 330                 if (!in_array(0, $activity['receiver'])) {
 331                         // Private activities will not be modified
 332                         return $activity['receiver'];
 333                 }
 334
 335                 // Add all owners of the referring item to the receivers
 336                 $original = $receivers = $activity['receiver'];
 337                 $items = Item::select(['uid'], ['uri' => $activity['object_id']]);
 338                 while ($item = DBA::fetch($items)) {
 339                         $receivers['uid:' . $item['uid']] = $item['uid'];
 340                 }
 341                 DBA::close($items);
 342
 343                 if (count($original) != count($receivers)) {
 344                         Logger::info('Improved data', ['id' => $activity['id'], 'object' => $activity['object_id'], 'original' => $original, 'improved' => $receivers]);
 345                 }
 346
 347                 return $receivers;
 348         }
 349
 350         /**
 351          * Prepare the item array for an activity
 352          *
 353          * @param array  $activity Activity array
 354          * @param string $verb     Activity verb
 355          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 356          * @throws \ImagickException
 357          */
 358         public static function createActivity($activity, $verb)
 359         {
 360                 $item = self::createItem($activity);
 361                 $item['verb'] = $verb;
 362                 $item['thr-parent'] = $activity['object_id'];
 363                 $item['gravity'] = GRAVITY_ACTIVITY;
 364                 $item['object-type'] = Activity\ObjectType::NOTE;
 365
 366                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 367
 368                 $activity['receiver'] = self::addReceivers($activity);
 369
 370                 self::postItem($activity, $item);
 371         }
 372
 373         /**
 374          * Create an event
 375          *
 376          * @param array $activity Activity array
 377          * @param array $item
 378          * @throws \Exception
 379          */
 380         public static function createEvent($activity, $item)
 381         {
 382                 $event['summary']  = HTML::toBBCode($activity['name']);
 383                 $event['desc']     = HTML::toBBCode($activity['content']);
 384                 $event['start']    = $activity['start-time'];
 385                 $event['finish']   = $activity['end-time'];
 386                 $event['nofinish'] = empty($event['finish']);
 387                 $event['location'] = $activity['location'];
 388                 $event['adjust']   = true;
 389                 $event['cid']      = $item['contact-id'];
 390                 $event['uid']      = $item['uid'];
 391                 $event['uri']      = $item['uri'];
 392                 $event['edited']   = $item['edited'];
 393                 $event['private']  = $item['private'];
 394                 $event['guid']     = $item['guid'];
 395                 $event['plink']    = $item['plink'];
 396
 397                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 398                 $ev = DBA::selectFirst('event', ['id'], $condition);
 399                 if (DBA::isResult($ev)) {
 400                         $event['id'] = $ev['id'];
 401                 }
 402
 403                 $event_id = Event::store($event);
 404                 Logger::info('Event was stored', ['id' => $event_id]);
 405         }
 406
 407         /**
 408          * Process the content
 409          *
 410          * @param array $activity Activity array
 411          * @param array $item
 412          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 413          * @throws \Exception
 414          */
 415         private static function processContent($activity, $item)
 416         {
 417                 $item['title'] = HTML::toBBCode($activity['name']);
 418
 419                 if (!empty($activity['source'])) {
 420                         $item['body'] = $activity['source'];
 421                 } else {
 422                         $content = HTML::toBBCode($activity['content']);
 423
 424                         if (!empty($activity['emojis'])) {
 425                                 $content = self::replaceEmojis($content, $activity['emojis']);
 426                         }
 427
 428                         $content = self::convertMentions($content);
 429
 430                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 431                                 $item_private = !in_array(0, $activity['item_receiver']);
 432                                 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 433                                 if (!DBA::isResult($parent)) {
 434                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 435                                         return false;
 436                                 }
 437                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
 438                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 439                                         return false;
 440                                 }
 441
 442                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 443                         }
 444                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
 445                         $item['body'] = $content;
 446                 }
 447
 448                 self::storeFromBody($item);
 449                 self::storeTags($item['uri-id'], $activity['tags']);
 450
 451                 $item['location'] = $activity['location'];
 452
 453                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 454                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 455                 }
 456
 457                 $item['app'] = $activity['generator'];
 458
 459                 return $item;
 460         }
 461
 462         /**
 463          * Store hashtags and mentions
 464          *
 465          * @param array $item
 466          */
 467         private static function storeFromBody(array $item)
 468         {
 469                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 470                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 471
 472                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 473         }
 474
 475         /**
 476          * Generate a GUID out of an URL
 477          *
 478          * @param string $url message URL
 479          * @return string with GUID
 480          */
 481         private static function getGUIDByURL(string $url)
 482         {
 483                 $parsed = parse_url($url);
 484
 485                 $host_hash = hash('crc32', $parsed['host']);
 486
 487                 unset($parsed["scheme"]);
 488                 unset($parsed["host"]);
 489
 490                 $path = implode("/", $parsed);
 491
 492                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 493         }
 494
 495         /**
 496          * Creates an item post
 497          *
 498          * @param array $activity Activity data
 499          * @param array $item     item array
 500          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 501          * @throws \ImagickException
 502          */
 503         public static function postItem(array $activity, array $item)
 504         {
 505                 $stored = false;
 506
 507                 foreach ($activity['receiver'] as $receiver) {
 508                         if ($receiver == -1) {
 509                                 continue;
 510                         }
 511
 512                         $item['uid'] = $receiver;
 513
 514                         if ($item['isForum'] ?? false) {
 515                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver, false);
 516                         } else {
 517                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, false);
 518                         }
 519
 520                         if (($receiver != 0) && empty($item['contact-id'])) {
 521                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, false);
 522                         }
 523
 524                         if (!empty($activity['directmessage'])) {
 525                                 self::postMail($activity, $item);
 526                                 continue;
 527                         }
 528
 529                         if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 530                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 531
 532                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
 533                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 534                                 }
 535
 536                                 if ($skip) {
 537                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 538                                         continue;
 539                                 }
 540
 541                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 542                         }
 543
 544                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 545                                 self::createEvent($activity, $item);
 546                         }
 547
 548                         $item_id = Item::insert($item);
 549                         if ($item_id) {
 550                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 551                         } else {
 552                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 553                         }
 554
 555                         if ($item['uid'] == 0) {
 556                                 $stored = $item_id;
 557                         }
 558                 }
 559
 560                 // Store send a follow request for every reshare - but only when the item had been stored
 561                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 562                         $author = APContact::getByURL($item['owner-link'], false);
 563                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 564                         if ($author['type'] != 'Group') {
 565                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 566                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 567                         }
 568                 }
 569         }
 570
 571         /**
 572          * Store tags and mentions into the tag table
 573          *
 574          * @param integer $uriid
 575          * @param array $tags
 576          */
 577         private static function storeTags(int $uriid, array $tags = null)
 578         {
 579                 foreach ($tags as $tag) {
 580                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 581                                 continue;
 582                         }
 583
 584                         $hash = substr($tag['name'], 0, 1);
 585
 586                         if ($tag['type'] == 'Mention') {
 587                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
 588                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
 589                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
 590                                         $tag['name'] = substr($tag['name'], 1);
 591                                 }
 592                                 $type = Tag::IMPLICIT_MENTION;
 593
 594                                 if (!empty($tag['href'])) {
 595                                         $apcontact = APContact::getByURL($tag['href']);
 596                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
 597                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
 598                                         }
 599                                 }
 600                         } elseif ($tag['type'] == 'Hashtag') {
 601                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
 602                                         $tag['name'] = substr($tag['name'], 1);
 603                                 }
 604                                 $type = Tag::HASHTAG;
 605                         }
 606
 607                         if (empty($tag['name'])) {
 608                                 continue;
 609                         }
 610
 611                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
 612                 }
 613         }
 614
 615         /**
 616          * Creates an mail post
 617          *
 618          * @param array $activity Activity data
 619          * @param array $item     item array
 620          * @return int|bool New mail table row id or false on error
 621          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 622          */
 623         private static function postMail($activity, $item)
 624         {
 625                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
 626                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
 627                         return false;
 628                 }
 629
 630                 Logger::info('Direct Message', $item);
 631
 632                 $msg = [];
 633                 $msg['uid'] = $item['uid'];
 634
 635                 $msg['contact-id'] = $item['contact-id'];
 636
 637                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
 638                 $msg['from-name'] = $contact['name'];
 639                 $msg['from-url'] = $contact['url'];
 640                 $msg['from-photo'] = $contact['photo'];
 641
 642                 $msg['uri'] = $item['uri'];
 643                 $msg['created'] = $item['created'];
 644
 645                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
 646                 if (DBA::isResult($parent)) {
 647                         $msg['parent-uri'] = $parent['parent-uri'];
 648                         $msg['title'] = $parent['title'];
 649                 } else {
 650                         $msg['parent-uri'] = $item['thr-parent'];
 651
 652                         if (!empty($item['title'])) {
 653                                 $msg['title'] = $item['title'];
 654                         } elseif (!empty($item['content-warning'])) {
 655                                 $msg['title'] = $item['content-warning'];
 656                         } else {
 657                                 // Trying to generate a title out of the body
 658                                 $title = $item['body'];
 659
 660                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
 661                                         $title = $matches[3];
 662                                 }
 663
 664                                 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
 665
 666                                 if (strlen($title) > 20) {
 667                                         $title = substr($title, 0, 20) . '...';
 668                                 }
 669
 670                                 $msg['title'] = $title;
 671                         }
 672                 }
 673                 $msg['body'] = $item['body'];
 674
 675                 return Mail::insert($msg);
 676         }
 677
 678         /**
 679          * Fetches missing posts
 680          *
 681          * @param string $url message URL
 682          * @param array $child activity array with the child of this message
 683          * @return string fetched message URL
 684          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 685          */
 686         public static function fetchMissingActivity($url, $child = [])
 687         {
 688                 if (!empty($child['receiver'])) {
 689                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 690                 } else {
 691                         $uid = 0;
 692                 }
 693
 694                 $object = ActivityPub::fetchContent($url, $uid);
 695                 if (empty($object)) {
 696                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 697                         return '';
 698                 }
 699
 700                 if (empty($object['id'])) {
 701                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 702                         return '';
 703                 }
 704
 705                 if (!empty($child['author'])) {
 706                         $actor = $child['author'];
 707                 } elseif (!empty($object['actor'])) {
 708                         $actor = $object['actor'];
 709                 } elseif (!empty($object['attributedTo'])) {
 710                         $actor = $object['attributedTo'];
 711                 } else {
 712                         // Shouldn't happen
 713                         $actor = '';
 714                 }
 715
 716                 if (!empty($object['published'])) {
 717                         $published = $object['published'];
 718                 } elseif (!empty($child['published'])) {
 719                         $published = $child['published'];
 720                 } else {
 721                         $published = DateTimeFormat::utcNow();
 722                 }
 723
 724                 $activity = [];
 725                 $activity['@context'] = $object['@context'];
 726                 unset($object['@context']);
 727                 $activity['id'] = $object['id'];
 728                 $activity['to'] = $object['to'] ?? [];
 729                 $activity['cc'] = $object['cc'] ?? [];
 730                 $activity['actor'] = $actor;
 731                 $activity['object'] = $object;
 732                 $activity['published'] = $published;
 733                 $activity['type'] = 'Create';
 734
 735                 $ldactivity = JsonLD::compact($activity);
 736
 737                 $ldactivity['thread-completion'] = true;
 738
 739                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity));
 740
 741                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
 742
 743                 return $activity['id'];
 744         }
 745
 746         /**
 747          * perform a "follow" request
 748          *
 749          * @param array $activity
 750          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 751          * @throws \ImagickException
 752          */
 753         public static function followUser($activity)
 754         {
 755                 $uid = User::getIdForURL($activity['object_id']);
 756                 if (empty($uid)) {
 757                         return;
 758                 }
 759
 760                 $owner = User::getOwnerDataById($uid);
 761
 762                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 763                 if (!empty($cid)) {
 764                         self::switchContact($cid);
 765                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 766                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 767                 } else {
 768                         $contact = [];
 769                 }
 770
 771                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 772                         'author-link' => $activity['actor']];
 773
 774                 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
 775
 776                 // Ensure that the contact has got the right network type
 777                 self::switchContact($item['author-id']);
 778
 779                 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
 780                 if ($result === true) {
 781                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
 782                 }
 783
 784                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 785                 if (empty($cid)) {
 786                         return;
 787                 }
 788
 789                 if (empty($contact)) {
 790                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 791                 }
 792
 793                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
 794         }
 795
 796         /**
 797          * Update the given profile
 798          *
 799          * @param array $activity
 800          * @throws \Exception
 801          */
 802         public static function updatePerson($activity)
 803         {
 804                 if (empty($activity['object_id'])) {
 805                         return;
 806                 }
 807
 808                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
 809                 Contact::updateFromProbeByURL($activity['object_id'], true);
 810         }
 811
 812         /**
 813          * Delete the given profile
 814          *
 815          * @param array $activity
 816          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 817          */
 818         public static function deletePerson($activity)
 819         {
 820                 if (empty($activity['object_id']) || empty($activity['actor'])) {
 821                         Logger::info('Empty object id or actor.');
 822                         return;
 823                 }
 824
 825                 if ($activity['object_id'] != $activity['actor']) {
 826                         Logger::info('Object id does not match actor.');
 827                         return;
 828                 }
 829
 830                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
 831                 while ($contact = DBA::fetch($contacts)) {
 832                         Contact::remove($contact['id']);
 833                 }
 834                 DBA::close($contacts);
 835
 836                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
 837         }
 838
 839         /**
 840          * Accept a follow request
 841          *
 842          * @param array $activity
 843          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 844          * @throws \ImagickException
 845          */
 846         public static function acceptFollowUser($activity)
 847         {
 848                 $uid = User::getIdForURL($activity['object_actor']);
 849                 if (empty($uid)) {
 850                         return;
 851                 }
 852
 853                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 854                 if (empty($cid)) {
 855                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 856                         return;
 857                 }
 858
 859                 self::switchContact($cid);
 860
 861                 $fields = ['pending' => false];
 862
 863                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
 864                 if ($contact['rel'] == Contact::FOLLOWER) {
 865                         $fields['rel'] = Contact::FRIEND;
 866                 }
 867
 868                 $condition = ['id' => $cid];
 869                 DBA::update('contact', $fields, $condition);
 870                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
 871         }
 872
 873         /**
 874          * Reject a follow request
 875          *
 876          * @param array $activity
 877          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 878          * @throws \ImagickException
 879          */
 880         public static function rejectFollowUser($activity)
 881         {
 882                 $uid = User::getIdForURL($activity['object_actor']);
 883                 if (empty($uid)) {
 884                         return;
 885                 }
 886
 887                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 888                 if (empty($cid)) {
 889                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 890                         return;
 891                 }
 892
 893                 self::switchContact($cid);
 894
 895                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
 896                         Contact::remove($cid);
 897                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
 898                 } else {
 899                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
 900                 }
 901         }
 902
 903         /**
 904          * Undo activity like "like" or "dislike"
 905          *
 906          * @param array $activity
 907          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 908          * @throws \ImagickException
 909          */
 910         public static function undoActivity($activity)
 911         {
 912                 if (empty($activity['object_id'])) {
 913                         return;
 914                 }
 915
 916                 if (empty($activity['object_actor'])) {
 917                         return;
 918                 }
 919
 920                 $author_id = Contact::getIdForURL($activity['object_actor']);
 921                 if (empty($author_id)) {
 922                         return;
 923                 }
 924
 925                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
 926         }
 927
 928         /**
 929          * Activity to remove a follower
 930          *
 931          * @param array $activity
 932          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 933          * @throws \ImagickException
 934          */
 935         public static function undoFollowUser($activity)
 936         {
 937                 $uid = User::getIdForURL($activity['object_object']);
 938                 if (empty($uid)) {
 939                         return;
 940                 }
 941
 942                 $owner = User::getOwnerDataById($uid);
 943
 944                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 945                 if (empty($cid)) {
 946                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 947                         return;
 948                 }
 949
 950                 self::switchContact($cid);
 951
 952                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
 953                 if (!DBA::isResult($contact)) {
 954                         return;
 955                 }
 956
 957                 Contact::removeFollower($owner, $contact);
 958                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
 959         }
 960
 961         /**
 962          * Switches a contact to AP if needed
 963          *
 964          * @param integer $cid Contact ID
 965          * @throws \Exception
 966          */
 967         private static function switchContact($cid)
 968         {
 969                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
 970                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
 971                         return;
 972                 }
 973
 974                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
 975                 Contact::updateFromProbe($cid);
 976         }
 977
 978         /**
 979          * Collects implicit mentions like:
 980          * - the author of the parent item
 981          * - all the mentioned conversants in the parent item
 982          *
 983          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
 984          * @return array
 985          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 986          */
 987         private static function getImplicitMentionList(array $parent)
 988         {
 989                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
 990
 991                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
 992
 993                 $implicit_mentions = [];
 994                 if (empty($parent_author['url'])) {
 995                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
 996                 } else {
 997                         $implicit_mentions[] = $parent_author['url'];
 998                         $implicit_mentions[] = $parent_author['nurl'];
 999                         $implicit_mentions[] = $parent_author['alias'];
1000                 }
1001
1002                 if (!empty($parent['alias'])) {
1003                         $implicit_mentions[] = $parent['alias'];
1004                 }
1005
1006                 foreach ($parent_terms as $term) {
1007                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1008                         if (!empty($contact['url'])) {
1009                                 $implicit_mentions[] = $contact['url'];
1010                                 $implicit_mentions[] = $contact['nurl'];
1011                                 $implicit_mentions[] = $contact['alias'];
1012                         }
1013                 }
1014
1015                 return $implicit_mentions;
1016         }
1017
1018         /**
1019          * Strips from the body prepended implicit mentions
1020          *
1021          * @param string $body
1022          * @param array $parent
1023          * @return string
1024          */
1025         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1026         {
1027                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1028                         return $body;
1029                 }
1030
1031                 $potential_mentions = self::getImplicitMentionList($parent);
1032
1033                 $kept_mentions = [];
1034
1035                 // Extract one prepended mention at a time from the body
1036                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1037                         if (!in_array($matches[2], $potential_mentions)) {
1038                                 $kept_mentions[] = $matches[1];
1039                         }
1040
1041                         $body = $matches[3];
1042                 }
1043
1044                 // Re-appending the kept mentions to the body after extraction
1045                 $kept_mentions[] = $body;
1046
1047                 return implode('', $kept_mentions);
1048         }
1049 }