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\Core\System;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Model\APContact;
  33 use Friendica\Model\Contact;
  34 use Friendica\Model\Conversation;
  35 use Friendica\Model\Event;
  36 use Friendica\Model\Item;
  37 use Friendica\Model\ItemURI;
  38 use Friendica\Model\Mail;
  39 use Friendica\Model\Tag;
  40 use Friendica\Model\User;
  41 use Friendica\Protocol\Activity;
  42 use Friendica\Protocol\ActivityPub;
  43 use Friendica\Util\DateTimeFormat;
  44 use Friendica\Util\JsonLD;
  45 use Friendica\Util\Strings;
  46
  47 /**
  48  * ActivityPub Processor Protocol class
  49  */
  50 class Processor
  51 {
  52         /**
  53          * Converts mentions from Pleroma into the Friendica format
  54          *
  55          * @param string $body
  56          *
  57          * @return string converted body
  58          */
  59         private static function convertMentions($body)
  60         {
  61                 $URLSearchString = "^\[\]";
  62                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
  63
  64                 return $body;
  65         }
  66
  67         /**
  68          * Replaces emojis in the body
  69          *
  70          * @param array $emojis
  71          * @param string $body
  72          *
  73          * @return string with replaced emojis
  74          */
  75         private static function replaceEmojis($body, array $emojis)
  76         {
  77                 foreach ($emojis as $emoji) {
  78                         $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
  79                         $body = str_replace($emoji['name'], $replace, $body);
  80                 }
  81                 return $body;
  82         }
  83
  84         /**
  85          * Add attachment data to the item array
  86          *
  87          * @param array   $activity
  88          * @param array   $item
  89          *
  90          * @return array array
  91          */
  92         private static function constructAttachList($activity, $item)
  93         {
  94                 if (empty($activity['attachments'])) {
  95                         return $item;
  96                 }
  97
  98                 foreach ($activity['attachments'] as $attach) {
  99                         switch ($attach['type']) {
 100                                 case 'link':
 101                                         $data = [
 102                                                 'url'      => $attach['url'],
 103                                                 'type'     => $attach['type'],
 104                                                 'title'    => $attach['title'] ?? '',
 105                                                 'text'     => $attach['desc']  ?? '',
 106                                                 'image'    => $attach['image'] ?? '',
 107                                                 'images'   => [],
 108                                                 'keywords' => [],
 109                                         ];
 110                                         $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
 111                                         break;
 112                                 default:
 113                                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 114                                         if ($filetype == 'image') {
 115                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 116                                                         continue 2;
 117                                                 }
 118
 119                                                 $item['body'] .= "\n";
 120
 121                                                 // image is the preview/thumbnail URL
 122                                                 if (!empty($attach['image'])) {
 123                                                         $item['body'] .= '[url=' . $attach['url'] . ']';
 124                                                         $attach['url'] = $attach['image'];
 125                                                 }
 126
 127                                                 if (empty($attach['name'])) {
 128                                                         $item['body'] .= '[img]' . $attach['url'] . '[/img]';
 129                                                 } else {
 130                                                         $item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
 131                                                 }
 132
 133                                                 if (!empty($attach['image'])) {
 134                                                         $item['body'] .= '[/url]';
 135                                                 }
 136                                         } elseif ($filetype == 'audio') {
 137                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 138                                                         continue 2;
 139                                                 }
 140
 141                                                 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
 142                                         } elseif ($filetype == 'video') {
 143                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 144                                                         continue 2;
 145                                                 }
 146
 147                                                 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
 148                                         } else {
 149                                                 if (!empty($item["attach"])) {
 150                                                         $item["attach"] .= ',';
 151                                                 } else {
 152                                                         $item["attach"] = '';
 153                                                 }
 154
 155                                                 $item["attach"] .= '[attach]href="' . $attach['url'] . '" length="' . ($attach['length'] ?? '0') . '" type="' . $attach['mediaType'] . '" title="' . ($attach['name'] ?? '') . '"[/attach]';
 156                                         }
 157                         }
 158                 }
 159
 160                 return $item;
 161         }
 162
 163         /**
 164          * Updates a message
 165          *
 166          * @param array $activity Activity array
 167          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 168          */
 169         public static function updateItem($activity)
 170         {
 171                 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
 172                 if (!DBA::isResult($item)) {
 173                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 174                         $item = self::createItem($activity);
 175                         self::postItem($activity, $item);
 176                         return;
 177                 }
 178
 179                 $item['changed'] = DateTimeFormat::utcNow();
 180                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 181
 182                 $item = self::processContent($activity, $item);
 183                 if (empty($item)) {
 184                         return;
 185                 }
 186
 187                 Item::update($item, ['uri' => $activity['id']]);
 188         }
 189
 190         /**
 191          * Prepares data for a message
 192          *
 193          * @param array $activity Activity array
 194          * @return array Internal item
 195          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 196          * @throws \ImagickException
 197          */
 198         public static function createItem($activity)
 199         {
 200                 $item = [];
 201                 $item['verb'] = Activity::POST;
 202                 $item['thr-parent'] = $activity['reply-to-id'];
 203
 204                 if ($activity['reply-to-id'] == $activity['id']) {
 205                         $item['gravity'] = GRAVITY_PARENT;
 206                         $item['object-type'] = Activity\ObjectType::NOTE;
 207                 } else {
 208                         $item['gravity'] = GRAVITY_COMMENT;
 209                         $item['object-type'] = Activity\ObjectType::COMMENT;
 210
 211                         // Ensure that the comment reaches all receivers of the referring post
 212                         $activity['receiver'] = self::addReceivers($activity);
 213                 }
 214
 215                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
 216                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
 217                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 218                 }
 219
 220                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 221
 222                 /// @todo What to do with $activity['context']?
 223                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
 224                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 225                         return [];
 226                 }
 227
 228                 $item['network'] = Protocol::ACTIVITYPUB;
 229                 $item['author-link'] = $activity['author'];
 230                 $item['author-id'] = Contact::getIdForURL($activity['author']);
 231                 $item['owner-link'] = $activity['actor'];
 232                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
 233
 234                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 235                         $item['private'] = Item::UNLISTED;
 236                 } elseif (in_array(0, $activity['receiver'])) {
 237                         $item['private'] = Item::PUBLIC;
 238                 } else {
 239                         $item['private'] = Item::PRIVATE;
 240                 }
 241
 242                 if (!empty($activity['raw'])) {
 243                         $item['source'] = $activity['raw'];
 244                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 245                         $item['conversation-href'] = $activity['context'] ?? '';
 246                         $item['conversation-uri'] = $activity['conversation'] ?? '';
 247
 248                         if (isset($activity['push'])) {
 249                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 250                         }
 251                 }
 252
 253                 $item['isForum'] = false;
 254
 255                 if (!empty($activity['thread-completion'])) {
 256                         // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 257                         $item['causer-link'] = $item['owner-link'];
 258                         $item['causer-id'] = $item['owner-id'];
 259
 260                         Logger::info('Ignoring actor because of thread completion.', ['actor' => $item['owner-link']]);
 261                         $item['owner-link'] = $item['author-link'];
 262                         $item['owner-id'] = $item['author-id'];
 263                 } else {
 264                         $actor = APContact::getByURL($item['owner-link'], false);
 265                         $item['isForum'] = ($actor['type'] == 'Group');
 266                 }
 267
 268                 $item['uri'] = $activity['id'];
 269
 270                 $item['created'] = DateTimeFormat::utc($activity['published']);
 271                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 272                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 273                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 274
 275                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 276
 277                 $item = self::processContent($activity, $item);
 278                 if (empty($item)) {
 279                         return [];
 280                 }
 281
 282                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 283
 284                 $item = self::constructAttachList($activity, $item);
 285
 286                 return $item;
 287         }
 288
 289         /**
 290          * Delete items
 291          *
 292          * @param array $activity
 293          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 294          * @throws \ImagickException
 295          */
 296         public static function deleteItem($activity)
 297         {
 298                 $owner = Contact::getIdForURL($activity['actor']);
 299
 300                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 301                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 302         }
 303
 304         /**
 305          * Prepare the item array for an activity
 306          *
 307          * @param array $activity Activity array
 308          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 309          * @throws \ImagickException
 310          */
 311         public static function addTag($activity)
 312         {
 313                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 314                         return;
 315                 }
 316
 317                 foreach ($activity['receiver'] as $receiver) {
 318                         $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 319                         if (!DBA::isResult($item)) {
 320                                 // We don't fetch missing content for this purpose
 321                                 continue;
 322                         }
 323
 324                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 325                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 326                                 continue;
 327                         }
 328
 329                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 330                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 331                 }
 332         }
 333
 334         /**
 335          * Add users to the receiver list of the given public activity.
 336          * This is used to ensure that the activity will be stored in every thread.
 337          *
 338          * @param array $activity Activity array
 339          * @return array Modified receiver list
 340          */
 341         private static function addReceivers(array $activity)
 342         {
 343                 if (!in_array(0, $activity['receiver'])) {
 344                         // Private activities will not be modified
 345                         return $activity['receiver'];
 346                 }
 347
 348                 // Add all owners of the referring item to the receivers
 349                 $original = $receivers = $activity['receiver'];
 350                 $items = Item::select(['uid'], ['uri' => $activity['object_id']]);
 351                 while ($item = DBA::fetch($items)) {
 352                         $receivers['uid:' . $item['uid']] = $item['uid'];
 353                 }
 354                 DBA::close($items);
 355
 356                 if (count($original) != count($receivers)) {
 357                         Logger::info('Improved data', ['id' => $activity['id'], 'object' => $activity['object_id'], 'original' => $original, 'improved' => $receivers, 'callstack' => System::callstack()]);
 358                 }
 359
 360                 return $receivers;
 361         }
 362
 363         /**
 364          * Prepare the item array for an activity
 365          *
 366          * @param array  $activity Activity array
 367          * @param string $verb     Activity verb
 368          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 369          * @throws \ImagickException
 370          */
 371         public static function createActivity($activity, $verb)
 372         {
 373                 $item = self::createItem($activity);
 374                 $item['verb'] = $verb;
 375                 $item['thr-parent'] = $activity['object_id'];
 376                 $item['gravity'] = GRAVITY_ACTIVITY;
 377                 $item['object-type'] = Activity\ObjectType::NOTE;
 378
 379                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 380
 381                 $activity['receiver'] = self::addReceivers($activity);
 382
 383                 self::postItem($activity, $item);
 384         }
 385
 386         /**
 387          * Create an event
 388          *
 389          * @param array $activity Activity array
 390          * @param array $item
 391          * @throws \Exception
 392          */
 393         public static function createEvent($activity, $item)
 394         {
 395                 $event['summary']  = HTML::toBBCode($activity['name']);
 396                 $event['desc']     = HTML::toBBCode($activity['content']);
 397                 $event['start']    = $activity['start-time'];
 398                 $event['finish']   = $activity['end-time'];
 399                 $event['nofinish'] = empty($event['finish']);
 400                 $event['location'] = $activity['location'];
 401                 $event['adjust']   = true;
 402                 $event['cid']      = $item['contact-id'];
 403                 $event['uid']      = $item['uid'];
 404                 $event['uri']      = $item['uri'];
 405                 $event['edited']   = $item['edited'];
 406                 $event['private']  = $item['private'];
 407                 $event['guid']     = $item['guid'];
 408                 $event['plink']    = $item['plink'];
 409
 410                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 411                 $ev = DBA::selectFirst('event', ['id'], $condition);
 412                 if (DBA::isResult($ev)) {
 413                         $event['id'] = $ev['id'];
 414                 }
 415
 416                 $event_id = Event::store($event);
 417                 Logger::info('Event was stored', ['id' => $event_id]);
 418         }
 419
 420         /**
 421          * Process the content
 422          *
 423          * @param array $activity Activity array
 424          * @param array $item
 425          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 426          * @throws \Exception
 427          */
 428         private static function processContent($activity, $item)
 429         {
 430                 $item['title'] = HTML::toBBCode($activity['name']);
 431
 432                 if (!empty($activity['source'])) {
 433                         $item['body'] = $activity['source'];
 434                 } else {
 435                         $content = HTML::toBBCode($activity['content']);
 436
 437                         if (!empty($activity['emojis'])) {
 438                                 $content = self::replaceEmojis($content, $activity['emojis']);
 439                         }
 440
 441                         $content = self::convertMentions($content);
 442
 443                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 444                                 $item_private = !in_array(0, $activity['item_receiver']);
 445                                 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 446                                 if (!DBA::isResult($parent)) {
 447                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 448                                         return false;
 449                                 }
 450                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
 451                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 452                                         return false;
 453                                 }
 454
 455                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 456                         }
 457                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
 458                         $item['body'] = $content;
 459                 }
 460
 461                 self::storeFromBody($item);
 462                 self::storeTags($item['uri-id'], $activity['tags']);
 463
 464                 $item['location'] = $activity['location'];
 465
 466                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 467                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 468                 }
 469
 470                 $item['app'] = $activity['generator'];
 471
 472                 return $item;
 473         }
 474
 475         /**
 476          * Store hashtags and mentions
 477          *
 478          * @param array $item
 479          */
 480         private static function storeFromBody(array $item)
 481         {
 482                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 483                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 484
 485                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 486         }
 487
 488         /**
 489          * Generate a GUID out of an URL
 490          *
 491          * @param string $url message URL
 492          * @return string with GUID
 493          */
 494         private static function getGUIDByURL(string $url)
 495         {
 496                 $parsed = parse_url($url);
 497
 498                 $host_hash = hash('crc32', $parsed['host']);
 499
 500                 unset($parsed["scheme"]);
 501                 unset($parsed["host"]);
 502
 503                 $path = implode("/", $parsed);
 504
 505                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 506         }
 507
 508         /**
 509          * Creates an item post
 510          *
 511          * @param array $activity Activity data
 512          * @param array $item     item array
 513          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 514          * @throws \ImagickException
 515          */
 516         public static function postItem(array $activity, array $item)
 517         {
 518                 if (empty($item)) {
 519                         return;
 520                 }
 521
 522                 $stored = false;
 523
 524                 foreach ($activity['receiver'] as $receiver) {
 525                         if ($receiver == -1) {
 526                                 continue;
 527                         }
 528
 529                         $item['uid'] = $receiver;
 530
 531                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
 532                         switch($type) {
 533                                 case Receiver::TARGET_TO:
 534                                         $item['post-type'] = Item::PT_TO;
 535                                         break;
 536                                 case Receiver::TARGET_CC:
 537                                         $item['post-type'] = Item::PT_CC;
 538                                         break;
 539                                 case Receiver::TARGET_BTO:
 540                                         $item['post-type'] = Item::PT_BTO;
 541                                         break;
 542                                 case Receiver::TARGET_BCC:
 543                                         $item['post-type'] = Item::PT_BCC;
 544                                         break;
 545                                 case Receiver::TARGET_FOLLOWER:
 546                                         $item['post-type'] = Item::PT_FOLLOWER;
 547                                         break;
 548                                 case Receiver::TARGET_ANSWER:
 549                                         $item['post-type'] = Item::PT_COMMENT;
 550                                         break;
 551                                 default:
 552                                         $item['post-type'] = Item::PT_ARTICLE;
 553                         }
 554
 555                         if ($item['isForum'] ?? false) {
 556                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
 557                         } else {
 558                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
 559                         }
 560
 561                         if (($receiver != 0) && empty($item['contact-id'])) {
 562                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
 563                         }
 564
 565                         if (!empty($activity['directmessage'])) {
 566                                 self::postMail($activity, $item);
 567                                 continue;
 568                         }
 569
 570                         if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 571                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 572
 573                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
 574                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 575                                 }
 576
 577                                 if ($skip) {
 578                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 579                                         continue;
 580                                 }
 581
 582                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 583                         }
 584
 585                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 586                                 self::createEvent($activity, $item);
 587                         }
 588
 589                         $item_id = Item::insert($item);
 590                         if ($item_id) {
 591                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 592                         } else {
 593                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 594                         }
 595
 596                         if ($item['uid'] == 0) {
 597                                 $stored = $item_id;
 598                         }
 599                 }
 600
 601                 // Store send a follow request for every reshare - but only when the item had been stored
 602                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 603                         $author = APContact::getByURL($item['owner-link'], false);
 604                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 605                         if ($author['type'] != 'Group') {
 606                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 607                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 608                         }
 609                 }
 610         }
 611
 612         /**
 613          * Store tags and mentions into the tag table
 614          *
 615          * @param integer $uriid
 616          * @param array $tags
 617          */
 618         private static function storeTags(int $uriid, array $tags = null)
 619         {
 620                 foreach ($tags as $tag) {
 621                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 622                                 continue;
 623                         }
 624
 625                         $hash = substr($tag['name'], 0, 1);
 626
 627                         if ($tag['type'] == 'Mention') {
 628                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
 629                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
 630                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
 631                                         $tag['name'] = substr($tag['name'], 1);
 632                                 }
 633                                 $type = Tag::IMPLICIT_MENTION;
 634
 635                                 if (!empty($tag['href'])) {
 636                                         $apcontact = APContact::getByURL($tag['href']);
 637                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
 638                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
 639                                         }
 640                                 }
 641                         } elseif ($tag['type'] == 'Hashtag') {
 642                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
 643                                         $tag['name'] = substr($tag['name'], 1);
 644                                 }
 645                                 $type = Tag::HASHTAG;
 646                         }
 647
 648                         if (empty($tag['name'])) {
 649                                 continue;
 650                         }
 651
 652                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
 653                 }
 654         }
 655
 656         /**
 657          * Creates an mail post
 658          *
 659          * @param array $activity Activity data
 660          * @param array $item     item array
 661          * @return int|bool New mail table row id or false on error
 662          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 663          */
 664         private static function postMail($activity, $item)
 665         {
 666                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
 667                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
 668                         return false;
 669                 }
 670
 671                 Logger::info('Direct Message', $item);
 672
 673                 $msg = [];
 674                 $msg['uid'] = $item['uid'];
 675
 676                 $msg['contact-id'] = $item['contact-id'];
 677
 678                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
 679                 $msg['from-name'] = $contact['name'];
 680                 $msg['from-url'] = $contact['url'];
 681                 $msg['from-photo'] = $contact['photo'];
 682
 683                 $msg['uri'] = $item['uri'];
 684                 $msg['created'] = $item['created'];
 685
 686                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
 687                 if (DBA::isResult($parent)) {
 688                         $msg['parent-uri'] = $parent['parent-uri'];
 689                         $msg['title'] = $parent['title'];
 690                 } else {
 691                         $msg['parent-uri'] = $item['thr-parent'];
 692
 693                         if (!empty($item['title'])) {
 694                                 $msg['title'] = $item['title'];
 695                         } elseif (!empty($item['content-warning'])) {
 696                                 $msg['title'] = $item['content-warning'];
 697                         } else {
 698                                 // Trying to generate a title out of the body
 699                                 $title = $item['body'];
 700
 701                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
 702                                         $title = $matches[3];
 703                                 }
 704
 705                                 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
 706
 707                                 if (strlen($title) > 20) {
 708                                         $title = substr($title, 0, 20) . '...';
 709                                 }
 710
 711                                 $msg['title'] = $title;
 712                         }
 713                 }
 714                 $msg['body'] = $item['body'];
 715
 716                 return Mail::insert($msg);
 717         }
 718
 719         /**
 720          * Fetches missing posts
 721          *
 722          * @param string $url message URL
 723          * @param array $child activity array with the child of this message
 724          * @return string fetched message URL
 725          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 726          */
 727         public static function fetchMissingActivity(string $url, array $child = [])
 728         {
 729                 if (!empty($child['receiver'])) {
 730                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 731                 } else {
 732                         $uid = 0;
 733                 }
 734
 735                 $object = ActivityPub::fetchContent($url, $uid);
 736                 if (empty($object)) {
 737                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 738                         return '';
 739                 }
 740
 741                 if (empty($object['id'])) {
 742                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 743                         return '';
 744                 }
 745
 746                 if (!empty($child['author'])) {
 747                         $actor = $child['author'];
 748                 } elseif (!empty($object['actor'])) {
 749                         $actor = $object['actor'];
 750                 } elseif (!empty($object['attributedTo'])) {
 751                         $actor = $object['attributedTo'];
 752                 } else {
 753                         // Shouldn't happen
 754                         $actor = '';
 755                 }
 756
 757                 if (!empty($object['published'])) {
 758                         $published = $object['published'];
 759                 } elseif (!empty($child['published'])) {
 760                         $published = $child['published'];
 761                 } else {
 762                         $published = DateTimeFormat::utcNow();
 763                 }
 764
 765                 $activity = [];
 766                 $activity['@context'] = $object['@context'];
 767                 unset($object['@context']);
 768                 $activity['id'] = $object['id'];
 769                 $activity['to'] = $object['to'] ?? [];
 770                 $activity['cc'] = $object['cc'] ?? [];
 771                 $activity['actor'] = $actor;
 772                 $activity['object'] = $object;
 773                 $activity['published'] = $published;
 774                 $activity['type'] = 'Create';
 775
 776                 $ldactivity = JsonLD::compact($activity);
 777
 778                 $ldactivity['thread-completion'] = true;
 779
 780                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity));
 781
 782                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
 783
 784                 return $activity['id'];
 785         }
 786
 787         /**
 788          * perform a "follow" request
 789          *
 790          * @param array $activity
 791          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 792          * @throws \ImagickException
 793          */
 794         public static function followUser($activity)
 795         {
 796                 $uid = User::getIdForURL($activity['object_id']);
 797                 if (empty($uid)) {
 798                         return;
 799                 }
 800
 801                 $owner = User::getOwnerDataById($uid);
 802                 if (empty($owner)) {
 803                         return;
 804                 }
 805
 806                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 807                 if (!empty($cid)) {
 808                         self::switchContact($cid);
 809                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 810                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 811                 } else {
 812                         $contact = [];
 813                 }
 814
 815                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 816                         'author-link' => $activity['actor']];
 817
 818                 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
 819
 820                 // Ensure that the contact has got the right network type
 821                 self::switchContact($item['author-id']);
 822
 823                 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
 824                 if ($result === true) {
 825                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
 826                 }
 827
 828                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 829                 if (empty($cid)) {
 830                         return;
 831                 }
 832
 833                 if (empty($contact)) {
 834                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 835                 }
 836
 837                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
 838         }
 839
 840         /**
 841          * Update the given profile
 842          *
 843          * @param array $activity
 844          * @throws \Exception
 845          */
 846         public static function updatePerson($activity)
 847         {
 848                 if (empty($activity['object_id'])) {
 849                         return;
 850                 }
 851
 852                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
 853                 Contact::updateFromProbeByURL($activity['object_id']);
 854         }
 855
 856         /**
 857          * Delete the given profile
 858          *
 859          * @param array $activity
 860          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 861          */
 862         public static function deletePerson($activity)
 863         {
 864                 if (empty($activity['object_id']) || empty($activity['actor'])) {
 865                         Logger::info('Empty object id or actor.');
 866                         return;
 867                 }
 868
 869                 if ($activity['object_id'] != $activity['actor']) {
 870                         Logger::info('Object id does not match actor.');
 871                         return;
 872                 }
 873
 874                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
 875                 while ($contact = DBA::fetch($contacts)) {
 876                         Contact::remove($contact['id']);
 877                 }
 878                 DBA::close($contacts);
 879
 880                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
 881         }
 882
 883         /**
 884          * Accept a follow request
 885          *
 886          * @param array $activity
 887          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 888          * @throws \ImagickException
 889          */
 890         public static function acceptFollowUser($activity)
 891         {
 892                 $uid = User::getIdForURL($activity['object_actor']);
 893                 if (empty($uid)) {
 894                         return;
 895                 }
 896
 897                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 898                 if (empty($cid)) {
 899                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 900                         return;
 901                 }
 902
 903                 self::switchContact($cid);
 904
 905                 $fields = ['pending' => false];
 906
 907                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
 908                 if ($contact['rel'] == Contact::FOLLOWER) {
 909                         $fields['rel'] = Contact::FRIEND;
 910                 }
 911
 912                 $condition = ['id' => $cid];
 913                 DBA::update('contact', $fields, $condition);
 914                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
 915         }
 916
 917         /**
 918          * Reject a follow request
 919          *
 920          * @param array $activity
 921          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 922          * @throws \ImagickException
 923          */
 924         public static function rejectFollowUser($activity)
 925         {
 926                 $uid = User::getIdForURL($activity['object_actor']);
 927                 if (empty($uid)) {
 928                         return;
 929                 }
 930
 931                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 932                 if (empty($cid)) {
 933                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 934                         return;
 935                 }
 936
 937                 self::switchContact($cid);
 938
 939                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
 940                         Contact::remove($cid);
 941                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
 942                 } else {
 943                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
 944                 }
 945         }
 946
 947         /**
 948          * Undo activity like "like" or "dislike"
 949          *
 950          * @param array $activity
 951          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 952          * @throws \ImagickException
 953          */
 954         public static function undoActivity($activity)
 955         {
 956                 if (empty($activity['object_id'])) {
 957                         return;
 958                 }
 959
 960                 if (empty($activity['object_actor'])) {
 961                         return;
 962                 }
 963
 964                 $author_id = Contact::getIdForURL($activity['object_actor']);
 965                 if (empty($author_id)) {
 966                         return;
 967                 }
 968
 969                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
 970         }
 971
 972         /**
 973          * Activity to remove a follower
 974          *
 975          * @param array $activity
 976          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 977          * @throws \ImagickException
 978          */
 979         public static function undoFollowUser($activity)
 980         {
 981                 $uid = User::getIdForURL($activity['object_object']);
 982                 if (empty($uid)) {
 983                         return;
 984                 }
 985
 986                 $owner = User::getOwnerDataById($uid);
 987                 if (empty($owner)) {
 988                         return;
 989                 }
 990
 991                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 992                 if (empty($cid)) {
 993                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 994                         return;
 995                 }
 996
 997                 self::switchContact($cid);
 998
 999                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1000                 if (!DBA::isResult($contact)) {
1001                         return;
1002                 }
1003
1004                 Contact::removeFollower($owner, $contact);
1005                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1006         }
1007
1008         /**
1009          * Switches a contact to AP if needed
1010          *
1011          * @param integer $cid Contact ID
1012          * @throws \Exception
1013          */
1014         private static function switchContact($cid)
1015         {
1016                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1017                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1018                         return;
1019                 }
1020
1021                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1022                 Contact::updateFromProbe($cid);
1023         }
1024
1025         /**
1026          * Collects implicit mentions like:
1027          * - the author of the parent item
1028          * - all the mentioned conversants in the parent item
1029          *
1030          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1031          * @return array
1032          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1033          */
1034         private static function getImplicitMentionList(array $parent)
1035         {
1036                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1037
1038                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1039
1040                 $implicit_mentions = [];
1041                 if (empty($parent_author['url'])) {
1042                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
1043                 } else {
1044                         $implicit_mentions[] = $parent_author['url'];
1045                         $implicit_mentions[] = $parent_author['nurl'];
1046                         $implicit_mentions[] = $parent_author['alias'];
1047                 }
1048
1049                 if (!empty($parent['alias'])) {
1050                         $implicit_mentions[] = $parent['alias'];
1051                 }
1052
1053                 foreach ($parent_terms as $term) {
1054                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1055                         if (!empty($contact['url'])) {
1056                                 $implicit_mentions[] = $contact['url'];
1057                                 $implicit_mentions[] = $contact['nurl'];
1058                                 $implicit_mentions[] = $contact['alias'];
1059                         }
1060                 }
1061
1062                 return $implicit_mentions;
1063         }
1064
1065         /**
1066          * Strips from the body prepended implicit mentions
1067          *
1068          * @param string $body
1069          * @param array $parent
1070          * @return string
1071          */
1072         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1073         {
1074                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1075                         return $body;
1076                 }
1077
1078                 $potential_mentions = self::getImplicitMentionList($parent);
1079
1080                 $kept_mentions = [];
1081
1082                 // Extract one prepended mention at a time from the body
1083                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1084                         if (!in_array($matches[2], $potential_mentions)) {
1085                                 $kept_mentions[] = $matches[1];
1086                         }
1087
1088                         $body = $matches[3];
1089                 }
1090
1091                 // Re-appending the kept mentions to the body after extraction
1092                 $kept_mentions[] = $body;
1093
1094                 return implode('', $kept_mentions);
1095         }
1096 }