src/Protocol/ActivityPub/Processor.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Processor.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\Content\Text\BBCode;
   8 use Friendica\Content\Text\HTML;
   9 use Friendica\Core\Config;
  10 use Friendica\Core\Logger;
  11 use Friendica\Core\PConfig;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Database\DBA;
  14 use Friendica\Model\APContact;
  15 use Friendica\Model\Contact;
  16 use Friendica\Model\Event;
  17 use Friendica\Model\Item;
  18 use Friendica\Model\Mail;
  19 use Friendica\Model\Term;
  20 use Friendica\Model\User;
  21 use Friendica\Protocol\Activity;
  22 use Friendica\Protocol\ActivityPub;
  23 use Friendica\Util\DateTimeFormat;
  24 use Friendica\Util\JsonLD;
  25 use Friendica\Util\Strings;
  26
  27 /**
  28  * ActivityPub Processor Protocol class
  29  */
  30 class Processor
  31 {
  32         /**
  33          * Converts mentions from Pleroma into the Friendica format
  34          *
  35          * @param string $body
  36          *
  37          * @return string converted body
  38          */
  39         private static function convertMentions($body)
  40         {
  41                 $URLSearchString = "^\[\]";
  42                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
  43
  44                 return $body;
  45         }
  46
  47         /**
  48          * Replaces emojis in the body
  49          *
  50          * @param array $emojis
  51          * @param string $body
  52          *
  53          * @return string with replaced emojis
  54          */
  55         private static function replaceEmojis($body, array $emojis)
  56         {
  57                 foreach ($emojis as $emoji) {
  58                         $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
  59                         $body = str_replace($emoji['name'], $replace, $body);
  60                 }
  61                 return $body;
  62         }
  63
  64         /**
  65          * Constructs a string with tags for a given tag array
  66          *
  67          * @param array   $tags
  68          * @param boolean $sensitive
  69          * @return string with tags
  70          */
  71         private static function constructTagString(array $tags = null, $sensitive = false)
  72         {
  73                 if (empty($tags)) {
  74                         return '';
  75                 }
  76
  77                 $tag_text = '';
  78                 foreach ($tags as $tag) {
  79                         if (in_array($tag['type'] ?? '', ['Mention', 'Hashtag'])) {
  80                                 if (!empty($tag_text)) {
  81                                         $tag_text .= ',';
  82                                 }
  83
  84                                 $tag_text .= substr($tag['name'], 0, 1) . '[url=' . $tag['href'] . ']' . substr($tag['name'], 1) . '[/url]';
  85                         }
  86                 }
  87
  88                 /// @todo add nsfw for $sensitive
  89
  90                 return $tag_text;
  91         }
  92
  93         /**
  94          * Add attachment data to the item array
  95          *
  96          * @param array   $attachments
  97          * @param array   $item
  98          * @param boolean $no_images
  99          *
 100          * @return array array
 101          */
 102         private static function constructAttachList($attachments, $item, $no_images)
 103         {
 104                 if (empty($attachments)) {
 105                         return $item;
 106                 }
 107
 108                 foreach ($attachments as $attach) {
 109                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 110                         if ($filetype == 'image') {
 111                                 if ($no_images) {
 112                                         continue;
 113                                 }
 114
 115                                 if (empty($attach['name'])) {
 116                                         $item['body'] .= "\n[img]" . $attach['url'] . '[/img]';
 117                                 } else {
 118                                         $item['body'] .= "\n[img=" . $attach['url'] . ']' . $attach['name'] . '[/img]';
 119                                 }
 120                         } else {
 121                                 if (!empty($item["attach"])) {
 122                                         $item["attach"] .= ',';
 123                                 } else {
 124                                         $item["attach"] = '';
 125                                 }
 126                                 if (!isset($attach['length'])) {
 127                                         $attach['length'] = "0";
 128                                 }
 129                                 $item["attach"] .= '[attach]href="'.$attach['url'].'" length="'.$attach['length'].'" type="'.$attach['mediaType'].'" title="'.($attach['name'] ?? '') .'"[/attach]';
 130                         }
 131                 }
 132
 133                 return $item;
 134         }
 135
 136         /**
 137          * Updates a message
 138          *
 139          * @param array $activity Activity array
 140          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 141          */
 142         public static function updateItem($activity)
 143         {
 144                 $item = Item::selectFirst(['uri', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
 145                 if (!DBA::isResult($item)) {
 146                         Logger::warning('Unknown item', ['uri' => $activity['id']]);
 147                         return;
 148                 }
 149
 150                 $item['changed'] = DateTimeFormat::utcNow();
 151                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 152
 153                 $item = self::processContent($activity, $item);
 154                 if (empty($item)) {
 155                         return;
 156                 }
 157
 158                 Item::update($item, ['uri' => $activity['id']]);
 159         }
 160
 161         /**
 162          * Prepares data for a message
 163          *
 164          * @param array $activity Activity array
 165          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 166          * @throws \ImagickException
 167          */
 168         public static function createItem($activity)
 169         {
 170                 $item = [];
 171                 $item['verb'] = Activity::POST;
 172                 $item['thr-parent'] = $activity['reply-to-id'];
 173
 174                 if ($activity['reply-to-id'] == $activity['id']) {
 175                         $item['gravity'] = GRAVITY_PARENT;
 176                         $item['object-type'] = Activity\ObjectType::NOTE;
 177                 } else {
 178                         $item['gravity'] = GRAVITY_COMMENT;
 179                         $item['object-type'] = Activity\ObjectType::COMMENT;
 180                 }
 181
 182                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
 183                         Logger::log('Parent ' . $activity['reply-to-id'] . ' not found. Try to refetch it.');
 184                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 185                 }
 186
 187                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 188
 189                 self::postItem($activity, $item);
 190         }
 191
 192         /**
 193          * Delete items
 194          *
 195          * @param array $activity
 196          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 197          * @throws \ImagickException
 198          */
 199         public static function deleteItem($activity)
 200         {
 201                 $owner = Contact::getIdForURL($activity['actor']);
 202
 203                 Logger::log('Deleting item ' . $activity['object_id'] . ' from ' . $owner, Logger::DEBUG);
 204                 Item::delete(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 205         }
 206
 207         /**
 208          * Prepare the item array for an activity
 209          *
 210          * @param array $activity Activity array
 211          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 212          * @throws \ImagickException
 213          */
 214         public static function addTag($activity)
 215         {
 216                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 217                         return;
 218                 }
 219
 220                 foreach ($activity['receiver'] as $receiver) {
 221                         $item = Item::selectFirst(['id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 222                         if (!DBA::isResult($item)) {
 223                                 // We don't fetch missing content for this purpose
 224                                 continue;
 225                         }
 226
 227                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 228                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 229                                 continue;
 230                         }
 231
 232                         // To-Do:
 233                         // - Check if "blocktag" is set
 234                         // - Check if actor is a contact
 235
 236                         if (!stristr($item['tag'], trim($activity['object_content']))) {
 237                                 $tag = $item['tag'] . (strlen($item['tag']) ? ',' : '') . '#[url=' . $activity['object_id'] . ']'. $activity['object_content'] . '[/url]';
 238                                 Item::update(['tag' => $tag], ['id' => $item['id']]);
 239                                 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 240                         }
 241                 }
 242         }
 243
 244         /**
 245          * Prepare the item array for an activity
 246          *
 247          * @param array  $activity Activity array
 248          * @param string $verb     Activity verb
 249          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 250          * @throws \ImagickException
 251          */
 252         public static function createActivity($activity, $verb)
 253         {
 254                 $item = [];
 255                 $item['verb'] = $verb;
 256                 $item['thr-parent'] = $activity['object_id'];
 257                 $item['gravity'] = GRAVITY_ACTIVITY;
 258                 $item['object-type'] = Activity\ObjectType::NOTE;
 259
 260                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 261
 262                 self::postItem($activity, $item);
 263         }
 264
 265         /**
 266          * Create an event
 267          *
 268          * @param array $activity Activity array
 269          * @param array $item
 270          * @throws \Exception
 271          */
 272         public static function createEvent($activity, $item)
 273         {
 274                 $event['summary']  = HTML::toBBCode($activity['name']);
 275                 $event['desc']     = HTML::toBBCode($activity['content']);
 276                 $event['start']    = $activity['start-time'];
 277                 $event['finish']   = $activity['end-time'];
 278                 $event['nofinish'] = empty($event['finish']);
 279                 $event['location'] = $activity['location'];
 280                 $event['adjust']   = true;
 281                 $event['cid']      = $item['contact-id'];
 282                 $event['uid']      = $item['uid'];
 283                 $event['uri']      = $item['uri'];
 284                 $event['edited']   = $item['edited'];
 285                 $event['private']  = $item['private'];
 286                 $event['guid']     = $item['guid'];
 287                 $event['plink']    = $item['plink'];
 288
 289                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 290                 $ev = DBA::selectFirst('event', ['id'], $condition);
 291                 if (DBA::isResult($ev)) {
 292                         $event['id'] = $ev['id'];
 293                 }
 294
 295                 $event_id = Event::store($event);
 296                 Logger::log('Event '.$event_id.' was stored', Logger::DEBUG);
 297         }
 298
 299         /**
 300          * Process the content
 301          *
 302          * @param array $activity Activity array
 303          * @param array $item
 304          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 305          * @throws \Exception
 306          */
 307         private static function processContent($activity, $item)
 308         {
 309                 $item['title'] = HTML::toBBCode($activity['name']);
 310
 311                 if (!empty($activity['source'])) {
 312                         $item['body'] = $activity['source'];
 313                 } else {
 314                         $content = HTML::toBBCode($activity['content']);
 315
 316                         if (!empty($activity['emojis'])) {
 317                                 $content = self::replaceEmojis($content, $activity['emojis']);
 318                         }
 319
 320                         $content = self::convertMentions($content);
 321
 322                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 323                                 $item_private = !in_array(0, $activity['item_receiver']);
 324                                 $parent = Item::selectFirst(['id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 325                                 if (!DBA::isResult($parent)) {
 326                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 327                                         return false;
 328                                 }
 329                                 if ($item_private && !$parent['private']) {
 330                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 331                                         return false;
 332                                 }
 333
 334                                 $potential_implicit_mentions = self::getImplicitMentionList($parent);
 335                                 $content = self::removeImplicitMentionsFromBody($content, $potential_implicit_mentions);
 336                                 $activity['tags'] = self::convertImplicitMentionsInTags($activity['tags'], $potential_implicit_mentions);
 337                         }
 338                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
 339                         $item['body'] = $content;
 340
 341                         if (($activity['object_type'] == 'as:Video') && !empty($activity['alternate-url'])) {
 342                                 $item['body'] .= "\n[video]" . $activity['alternate-url'] . '[/video]';
 343                         }
 344                 }
 345
 346                 $item['tag'] = self::constructTagString($activity['tags'], $activity['sensitive']);
 347
 348                 $item['location'] = $activity['location'];
 349
 350                 if (!empty($item['latitude']) && !empty($item['longitude'])) {
 351                         $item['coord'] = $item['latitude'] . ' ' . $item['longitude'];
 352                 }
 353
 354                 $item['app'] = $activity['generator'];
 355
 356                 return $item;
 357         }
 358
 359         /**
 360          * Creates an item post
 361          *
 362          * @param array $activity Activity data
 363          * @param array $item     item array
 364          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 365          * @throws \ImagickException
 366          */
 367         private static function postItem($activity, $item)
 368         {
 369                 /// @todo What to do with $activity['context']?
 370                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
 371                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 372                         return;
 373                 }
 374
 375                 $item['network'] = Protocol::ACTIVITYPUB;
 376                 $item['private'] = !in_array(0, $activity['receiver']);
 377                 $item['author-link'] = $activity['author'];
 378                 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
 379                 $item['owner-link'] = $activity['actor'];
 380                 $item['owner-id'] = Contact::getIdForURL($activity['actor'], 0, true);
 381
 382                 $isForum = false;
 383
 384                 if (!empty($activity['thread-completion'])) {
 385                         // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 386                         $item['causer-link'] = $item['owner-link'];
 387                         $item['causer-id'] = $item['owner-id'];
 388
 389                         Logger::info('Ignoring actor because of thread completion.', ['actor' => $item['owner-link']]);
 390                         $item['owner-link'] = $item['author-link'];
 391                         $item['owner-id'] = $item['author-id'];
 392                 } else {
 393                         $actor = APContact::getByURL($item['owner-link'], false);
 394                         $isForum = ($actor['type'] == 'Group');
 395                 }
 396
 397                 $item['uri'] = $activity['id'];
 398
 399                 $item['created'] = DateTimeFormat::utc($activity['published']);
 400                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 401                 $item['guid'] = $activity['diaspora:guid'];
 402
 403                 $item = self::processContent($activity, $item);
 404                 if (empty($item)) {
 405                         return;
 406                 }
 407
 408                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 409
 410                 $item = self::constructAttachList($activity['attachments'], $item, !empty($activity['source']));
 411
 412                 $stored = false;
 413
 414                 foreach ($activity['receiver'] as $receiver) {
 415                         $item['uid'] = $receiver;
 416
 417                         if ($isForum) {
 418                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver, true);
 419                         } else {
 420                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
 421                         }
 422
 423                         if (($receiver != 0) && empty($item['contact-id'])) {
 424                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
 425                         }
 426
 427                         if (!empty($activity['directmessage'])) {
 428                                 self::postMail($activity, $item);
 429                                 continue;
 430                         }
 431
 432                         if (PConfig::get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 433                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 434
 435                                 if ($skip && (($activity['type'] == 'as:Announce') || $isForum)) {
 436                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 437                                 }
 438
 439                                 if ($skip) {
 440                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 441                                         continue;
 442                                 }
 443
 444                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 445                         }
 446
 447                         if ($activity['object_type'] == 'as:Event') {
 448                                 self::createEvent($activity, $item);
 449                         }
 450
 451                         $item_id = Item::insert($item);
 452                         if ($item_id) {
 453                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 454                         } else {
 455                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 456                         }
 457
 458                         if ($item['uid'] == 0) {
 459                                 $stored = $item_id;
 460                         }
 461                 }
 462
 463                 // Store send a follow request for every reshare - but only when the item had been stored
 464                 if ($stored && !$item['private'] && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 465                         $author = APContact::getByURL($item['owner-link'], false);
 466                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 467                         if ($author['type'] != 'Group') {
 468                                 Logger::log('Send follow request for ' . $item['uri'] . ' (' . $stored . ') to ' . $item['author-link'], Logger::DEBUG);
 469                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 470                         }
 471                 }
 472         }
 473
 474         /**
 475          * Creates an mail post
 476          *
 477          * @param array $activity Activity data
 478          * @param array $item     item array
 479          * @return int|bool New mail table row id or false on error
 480          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 481          */
 482         private static function postMail($activity, $item)
 483         {
 484                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
 485                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
 486                         return false;
 487                 }
 488
 489                 Logger::info('Direct Message', $item);
 490
 491                 $msg = [];
 492                 $msg['uid'] = $item['uid'];
 493
 494                 $msg['contact-id'] = $item['contact-id'];
 495
 496                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
 497                 $msg['from-name'] = $contact['name'];
 498                 $msg['from-url'] = $contact['url'];
 499                 $msg['from-photo'] = $contact['photo'];
 500
 501                 $msg['uri'] = $item['uri'];
 502                 $msg['created'] = $item['created'];
 503
 504                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
 505                 if (DBA::isResult($parent)) {
 506                         $msg['parent-uri'] = $parent['parent-uri'];
 507                         $msg['title'] = $parent['title'];
 508                 } else {
 509                         $msg['parent-uri'] = $item['thr-parent'];
 510
 511                         if (!empty($item['title'])) {
 512                                 $msg['title'] = $item['title'];
 513                         } elseif (!empty($item['content-warning'])) {
 514                                 $msg['title'] = $item['content-warning'];
 515                         } else {
 516                                 // Trying to generate a title out of the body
 517                                 $title = $item['body'];
 518
 519                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
 520                                         $title = $matches[3];
 521                                 }
 522
 523                                 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, 2, true), 0));
 524
 525                                 if (strlen($title) > 20) {
 526                                         $title = substr($title, 0, 20) . '...';
 527                                 }
 528
 529                                 $msg['title'] = $title;
 530                         }
 531                 }
 532                 $msg['body'] = $item['body'];
 533
 534                 return Mail::insert($msg);
 535         }
 536
 537         /**
 538          * Fetches missing posts
 539          *
 540          * @param string $url message URL
 541          * @param array $child activity array with the child of this message
 542          * @return boolean success
 543          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 544          */
 545         public static function fetchMissingActivity($url, $child = [])
 546         {
 547                 if (!empty($child['receiver'])) {
 548                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 549                 } else {
 550                         $uid = 0;
 551                 }
 552
 553                 $object = ActivityPub::fetchContent($url, $uid);
 554                 if (empty($object)) {
 555                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 556                         return false;
 557                 }
 558
 559                 if (empty($object['id'])) {
 560                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 561                         return false;
 562                 }
 563
 564                 if (!empty($child['author'])) {
 565                         $actor = $child['author'];
 566                 } elseif (!empty($object['actor'])) {
 567                         $actor = $object['actor'];
 568                 } elseif (!empty($object['attributedTo'])) {
 569                         $actor = $object['attributedTo'];
 570                 } else {
 571                         // Shouldn't happen
 572                         $actor = '';
 573                 }
 574
 575                 if (!empty($object['published'])) {
 576                         $published = $object['published'];
 577                 } elseif (!empty($child['published'])) {
 578                         $published = $child['published'];
 579                 } else {
 580                         $published = DateTimeFormat::utcNow();
 581                 }
 582
 583                 $activity = [];
 584                 $activity['@context'] = $object['@context'];
 585                 unset($object['@context']);
 586                 $activity['id'] = $object['id'];
 587                 $activity['to'] = $object['to'] ?? [];
 588                 $activity['cc'] = $object['cc'] ?? [];
 589                 $activity['actor'] = $actor;
 590                 $activity['object'] = $object;
 591                 $activity['published'] = $published;
 592                 $activity['type'] = 'Create';
 593
 594                 $ldactivity = JsonLD::compact($activity);
 595
 596                 $ldactivity['thread-completion'] = true;
 597
 598                 ActivityPub\Receiver::processActivity($ldactivity);
 599                 Logger::log('Activity ' . $url . ' had been fetched and processed.');
 600
 601                 return true;
 602         }
 603
 604         /**
 605          * perform a "follow" request
 606          *
 607          * @param array $activity
 608          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 609          * @throws \ImagickException
 610          */
 611         public static function followUser($activity)
 612         {
 613                 $uid = User::getIdForURL($activity['object_id']);
 614                 if (empty($uid)) {
 615                         return;
 616                 }
 617
 618                 $owner = User::getOwnerDataById($uid);
 619
 620                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 621                 if (!empty($cid)) {
 622                         self::switchContact($cid);
 623                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 624                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 625                 } else {
 626                         $contact = [];
 627                 }
 628
 629                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 630                         'author-link' => $activity['actor']];
 631
 632                 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
 633
 634                 // Ensure that the contact has got the right network type
 635                 self::switchContact($item['author-id']);
 636
 637                 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
 638                 if ($result === true) {
 639                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $item['author-id'], $owner['uid']);
 640                 }
 641
 642                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 643                 if (empty($cid)) {
 644                         return;
 645                 }
 646
 647                 if (empty($contact)) {
 648                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 649                 }
 650
 651                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
 652         }
 653
 654         /**
 655          * Update the given profile
 656          *
 657          * @param array $activity
 658          * @throws \Exception
 659          */
 660         public static function updatePerson($activity)
 661         {
 662                 if (empty($activity['object_id'])) {
 663                         return;
 664                 }
 665
 666                 Logger::log('Updating profile for ' . $activity['object_id'], Logger::DEBUG);
 667                 Contact::updateFromProbeByURL($activity['object_id'], true);
 668         }
 669
 670         /**
 671          * Delete the given profile
 672          *
 673          * @param array $activity
 674          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 675          */
 676         public static function deletePerson($activity)
 677         {
 678                 if (empty($activity['object_id']) || empty($activity['actor'])) {
 679                         Logger::log('Empty object id or actor.', Logger::DEBUG);
 680                         return;
 681                 }
 682
 683                 if ($activity['object_id'] != $activity['actor']) {
 684                         Logger::log('Object id does not match actor.', Logger::DEBUG);
 685                         return;
 686                 }
 687
 688                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
 689                 while ($contact = DBA::fetch($contacts)) {
 690                         Contact::remove($contact['id']);
 691                 }
 692                 DBA::close($contacts);
 693
 694                 Logger::log('Deleted contact ' . $activity['object_id'], Logger::DEBUG);
 695         }
 696
 697         /**
 698          * Accept a follow request
 699          *
 700          * @param array $activity
 701          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 702          * @throws \ImagickException
 703          */
 704         public static function acceptFollowUser($activity)
 705         {
 706                 $uid = User::getIdForURL($activity['object_actor']);
 707                 if (empty($uid)) {
 708                         return;
 709                 }
 710
 711                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 712                 if (empty($cid)) {
 713                         Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
 714                         return;
 715                 }
 716
 717                 self::switchContact($cid);
 718
 719                 $fields = ['pending' => false];
 720
 721                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
 722                 if ($contact['rel'] == Contact::FOLLOWER) {
 723                         $fields['rel'] = Contact::FRIEND;
 724                 }
 725
 726                 $condition = ['id' => $cid];
 727                 DBA::update('contact', $fields, $condition);
 728                 Logger::log('Accept contact request from contact ' . $cid . ' for user ' . $uid, Logger::DEBUG);
 729         }
 730
 731         /**
 732          * Reject a follow request
 733          *
 734          * @param array $activity
 735          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 736          * @throws \ImagickException
 737          */
 738         public static function rejectFollowUser($activity)
 739         {
 740                 $uid = User::getIdForURL($activity['object_actor']);
 741                 if (empty($uid)) {
 742                         return;
 743                 }
 744
 745                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 746                 if (empty($cid)) {
 747                         Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
 748                         return;
 749                 }
 750
 751                 self::switchContact($cid);
 752
 753                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
 754                         Contact::remove($cid);
 755                         Logger::log('Rejected contact request from contact ' . $cid . ' for user ' . $uid . ' - contact had been removed.', Logger::DEBUG);
 756                 } else {
 757                         Logger::log('Rejected contact request from contact ' . $cid . ' for user ' . $uid . '.', Logger::DEBUG);
 758                 }
 759         }
 760
 761         /**
 762          * Undo activity like "like" or "dislike"
 763          *
 764          * @param array $activity
 765          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 766          * @throws \ImagickException
 767          */
 768         public static function undoActivity($activity)
 769         {
 770                 if (empty($activity['object_id'])) {
 771                         return;
 772                 }
 773
 774                 if (empty($activity['object_actor'])) {
 775                         return;
 776                 }
 777
 778                 $author_id = Contact::getIdForURL($activity['object_actor']);
 779                 if (empty($author_id)) {
 780                         return;
 781                 }
 782
 783                 Item::delete(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
 784         }
 785
 786         /**
 787          * Activity to remove a follower
 788          *
 789          * @param array $activity
 790          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 791          * @throws \ImagickException
 792          */
 793         public static function undoFollowUser($activity)
 794         {
 795                 $uid = User::getIdForURL($activity['object_object']);
 796                 if (empty($uid)) {
 797                         return;
 798                 }
 799
 800                 $owner = User::getOwnerDataById($uid);
 801
 802                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 803                 if (empty($cid)) {
 804                         Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
 805                         return;
 806                 }
 807
 808                 self::switchContact($cid);
 809
 810                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
 811                 if (!DBA::isResult($contact)) {
 812                         return;
 813                 }
 814
 815                 Contact::removeFollower($owner, $contact);
 816                 Logger::log('Undo following request from contact ' . $cid . ' for user ' . $uid, Logger::DEBUG);
 817         }
 818
 819         /**
 820          * Switches a contact to AP if needed
 821          *
 822          * @param integer $cid Contact ID
 823          * @throws \Exception
 824          */
 825         private static function switchContact($cid)
 826         {
 827                 $contact = DBA::selectFirst('contact', ['network'], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 828                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
 829                         return;
 830                 }
 831
 832                 Logger::log('Change existing contact ' . $cid . ' from ' . $contact['network'] . ' to ActivityPub.');
 833                 Contact::updateFromProbe($cid, Protocol::ACTIVITYPUB);
 834         }
 835
 836         /**
 837          * Collects implicit mentions like:
 838          * - the author of the parent item
 839          * - all the mentioned conversants in the parent item
 840          *
 841          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
 842          * @return array
 843          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 844          */
 845         private static function getImplicitMentionList(array $parent)
 846         {
 847                 if (Config::get('system', 'disable_implicit_mentions')) {
 848                         return [];
 849                 }
 850
 851                 $parent_terms = Term::tagArrayFromItemId($parent['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 852
 853                 $parent_author = Contact::getDetailsByURL($parent['author-link'], 0);
 854
 855                 $implicit_mentions = [];
 856                 if (empty($parent_author)) {
 857                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
 858                 } else {
 859                         $implicit_mentions[] = $parent_author['url'];
 860                         $implicit_mentions[] = $parent_author['nurl'];
 861                         $implicit_mentions[] = $parent_author['alias'];
 862                 }
 863
 864                 if (!empty($parent['alias'])) {
 865                         $implicit_mentions[] = $parent['alias'];
 866                 }
 867
 868                 foreach ($parent_terms as $term) {
 869                         $contact = Contact::getDetailsByURL($term['url'], 0);
 870                         if (!empty($contact)) {
 871                                 $implicit_mentions[] = $contact['url'];
 872                                 $implicit_mentions[] = $contact['nurl'];
 873                                 $implicit_mentions[] = $contact['alias'];
 874                         }
 875                 }
 876
 877                 return $implicit_mentions;
 878         }
 879
 880         /**
 881          * Strips from the body prepended implicit mentions
 882          *
 883          * @param string $body
 884          * @param array $potential_mentions
 885          * @return string
 886          */
 887         private static function removeImplicitMentionsFromBody($body, array $potential_mentions)
 888         {
 889                 if (Config::get('system', 'disable_implicit_mentions')) {
 890                         return $body;
 891                 }
 892
 893                 $kept_mentions = [];
 894
 895                 // Extract one prepended mention at a time from the body
 896                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
 897                         if (!in_array($matches[2], $potential_mentions)) {
 898                                 $kept_mentions[] = $matches[1];
 899                         }
 900
 901                         $body = $matches[3];
 902                 }
 903
 904                 // Re-appending the kept mentions to the body after extraction
 905                 $kept_mentions[] = $body;
 906
 907                 return implode('', $kept_mentions);
 908         }
 909
 910         private static function convertImplicitMentionsInTags($activity_tags, array $potential_mentions)
 911         {
 912                 if (Config::get('system', 'disable_implicit_mentions')) {
 913                         return $activity_tags;
 914                 }
 915
 916                 foreach ($activity_tags as $index => $tag) {
 917                         if (in_array($tag['href'], $potential_mentions)) {
 918                                 $activity_tags[$index]['name'] = preg_replace(
 919                                         '/' . preg_quote(Term::TAG_CHARACTER[Term::MENTION], '/') . '/',
 920                                         Term::TAG_CHARACTER[Term::IMPLICIT_MENTION],
 921                                         $activity_tags[$index]['name'],
 922                                         1
 923                                 );
 924                         }
 925                 }
 926
 927                 return $activity_tags;
 928         }
 929 }