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\Database\DBA;
   8 use Friendica\Content\Text\HTML;
   9 use Friendica\Core\Config;
  10 use Friendica\Core\Logger;
  11 use Friendica\Core\Protocol;
  12 use Friendica\Model\Conversation;
  13 use Friendica\Model\Contact;
  14 use Friendica\Model\APContact;
  15 use Friendica\Model\Item;
  16 use Friendica\Model\Event;
  17 use Friendica\Model\User;
  18 use Friendica\Protocol\ActivityPub;
  19 use Friendica\Util\DateTimeFormat;
  20 use Friendica\Util\JsonLD;
  21 use Friendica\Util\Strings;
  22
  23 /**
  24  * ActivityPub Processor Protocol class
  25  */
  26 class Processor
  27 {
  28         /**
  29          * Converts mentions from Pleroma into the Friendica format
  30          *
  31          * @param string $body
  32          *
  33          * @return converted body
  34          */
  35         private static function convertMentions($body)
  36         {
  37                 $URLSearchString = "^\[\]";
  38                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
  39
  40                 return $body;
  41         }
  42
  43         /**
  44          * Replaces emojis in the body
  45          *
  46          * @param array $emojis
  47          * @param string $body
  48          *
  49          * @return string with replaced emojis
  50          */
  51         public static function replaceEmojis($emojis, $body)
  52         {
  53                 foreach ($emojis as $emoji) {
  54                         $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
  55                         $body = str_replace($emoji['name'], $replace, $body);
  56                 }
  57                 return $body;
  58         }
  59
  60         /**
  61          * Constructs a string with tags for a given tag array
  62          *
  63          * @param array $tags
  64          * @param boolean $sensitive
  65          *
  66          * @return string with tags
  67          */
  68         private static function constructTagList($tags, $sensitive)
  69         {
  70                 if (empty($tags)) {
  71                         return '';
  72                 }
  73
  74                 $tag_text = '';
  75                 foreach ($tags as $tag) {
  76                         if (in_array(defaults($tag, 'type', ''), ['Mention', 'Hashtag'])) {
  77                                 if (!empty($tag_text)) {
  78                                         $tag_text .= ',';
  79                                 }
  80
  81                                 $tag_text .= substr($tag['name'], 0, 1) . '[url=' . $tag['href'] . ']' . substr($tag['name'], 1) . '[/url]';
  82                         }
  83                 }
  84
  85                 /// @todo add nsfw for $sensitive
  86
  87                 return $tag_text;
  88         }
  89
  90         /**
  91          * Add attachment data to the item array
  92          *
  93          * @param array $attachments
  94          * @param array $item
  95          *
  96          * @return item array
  97          */
  98         private static function constructAttachList($attachments, $item)
  99         {
 100                 if (empty($attachments)) {
 101                         return $item;
 102                 }
 103
 104                 foreach ($attachments as $attach) {
 105                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 106                         if ($filetype == 'image') {
 107                                 $item['body'] .= "\n[img]" . $attach['url'] . '[/img]';
 108                         } else {
 109                                 if (!empty($item["attach"])) {
 110                                         $item["attach"] .= ',';
 111                                 } else {
 112                                         $item["attach"] = '';
 113                                 }
 114                                 if (!isset($attach['length'])) {
 115                                         $attach['length'] = "0";
 116                                 }
 117                                 $item["attach"] .= '[attach]href="'.$attach['url'].'" length="'.$attach['length'].'" type="'.$attach['mediaType'].'" title="'.defaults($attach, 'name', '').'"[/attach]';
 118                         }
 119                 }
 120
 121                 return $item;
 122         }
 123
 124         /**
 125          * Updates a message
 126          *
 127          * @param array  $activity Activity array
 128          */
 129         public static function updateItem($activity)
 130         {
 131                 $item = [];
 132                 $item['changed'] = DateTimeFormat::utcNow();
 133                 $item['edited'] = $activity['updated'];
 134                 $item['title'] = HTML::toBBCode($activity['name']);
 135                 $item['content-warning'] = HTML::toBBCode($activity['summary']);
 136                 $content = self::replaceEmojis($activity['emojis'], HTML::toBBCode($activity['content']));
 137                 $item['body'] = self::convertMentions($content);
 138                 $item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
 139
 140                 Item::update($item, ['uri' => $activity['id']]);
 141         }
 142
 143         /**
 144          * Prepares data for a message
 145          *
 146          * @param array  $activity Activity array
 147          */
 148         public static function createItem($activity)
 149         {
 150                 $item = [];
 151                 $item['verb'] = ACTIVITY_POST;
 152                 $item['parent-uri'] = $activity['reply-to-id'];
 153
 154                 if ($activity['reply-to-id'] == $activity['id']) {
 155                         $item['gravity'] = GRAVITY_PARENT;
 156                         $item['object-type'] = ACTIVITY_OBJ_NOTE;
 157                 } else {
 158                         $item['gravity'] = GRAVITY_COMMENT;
 159                         $item['object-type'] = ACTIVITY_OBJ_COMMENT;
 160                 }
 161
 162                 if (($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
 163                         Logger::log('Parent ' . $activity['reply-to-id'] . ' not found. Try to refetch it.');
 164                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 165                 }
 166
 167                 $item['diaspora_signed_text'] = defaults($activity, 'diaspora:comment', '');
 168
 169                 self::postItem($activity, $item);
 170         }
 171
 172         /**
 173          * Delete items
 174          *
 175          * @param array $activity
 176          */
 177         public static function deleteItem($activity)
 178         {
 179                 $owner = Contact::getIdForURL($activity['actor']);
 180
 181                 Logger::log('Deleting item ' . $activity['object_id'] . ' from ' . $owner, Logger::DEBUG);
 182                 Item::delete(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 183         }
 184
 185         /**
 186          * Prepare the item array for an activity
 187          *
 188          * @param array  $activity Activity array
 189          * @param string $verb     Activity verb
 190          */
 191         public static function createActivity($activity, $verb)
 192         {
 193                 $item = [];
 194                 $item['verb'] = $verb;
 195                 $item['parent-uri'] = $activity['object_id'];
 196                 $item['gravity'] = GRAVITY_ACTIVITY;
 197                 $item['object-type'] = ACTIVITY_OBJ_NOTE;
 198
 199                 $item['diaspora_signed_text'] = defaults($activity, 'diaspora:like', '');
 200
 201                 self::postItem($activity, $item);
 202         }
 203
 204         /**
 205          * Create an event
 206          *
 207          * @param array $activity Activity array
 208          * @param array $item
 209          */
 210         public static function createEvent($activity, $item)
 211         {
 212                 $event['summary']  = HTML::toBBCode($activity['name']);
 213                 $event['desc']     = HTML::toBBCode($activity['content']);
 214                 $event['start']    = $activity['start-time'];
 215                 $event['finish']   = $activity['end-time'];
 216                 $event['nofinish'] = empty($event['finish']);
 217                 $event['location'] = $activity['location'];
 218                 $event['adjust']   = true;
 219                 $event['cid']      = $item['contact-id'];
 220                 $event['uid']      = $item['uid'];
 221                 $event['uri']      = $item['uri'];
 222                 $event['edited']   = $item['edited'];
 223                 $event['private']  = $item['private'];
 224                 $event['guid']     = $item['guid'];
 225                 $event['plink']    = $item['plink'];
 226
 227                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 228                 $ev = DBA::selectFirst('event', ['id'], $condition);
 229                 if (DBA::isResult($ev)) {
 230                         $event['id'] = $ev['id'];
 231                 }
 232
 233                 $event_id = Event::store($event);
 234                 Logger::log('Event '.$event_id.' was stored', Logger::DEBUG);
 235         }
 236
 237         /**
 238          * Creates an item post
 239          *
 240          * @param array  $activity Activity data
 241          * @param array  $item     item array
 242          */
 243         private static function postItem($activity, $item)
 244         {
 245                 /// @todo What to do with $activity['context']?
 246
 247                 if (($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['parent-uri']])) {
 248                         Logger::log('Parent ' . $item['parent-uri'] . ' not found, message will be discarded.', Logger::DEBUG);
 249                         return;
 250                 }
 251
 252                 $item['network'] = Protocol::ACTIVITYPUB;
 253                 $item['private'] = !in_array(0, $activity['receiver']);
 254                 $item['author-link'] = $activity['author'];
 255                 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
 256
 257                 if (empty($activity['thread-completion'])) {
 258                         $item['owner-link'] = $activity['actor'];
 259                         $item['owner-id'] = Contact::getIdForURL($activity['actor'], 0, true);
 260                 } else {
 261                         Logger::log('Ignoring actor because of thread completion.', Logger::DEBUG);
 262                         $item['owner-link'] = $item['author-link'];
 263                         $item['owner-id'] = $item['author-id'];
 264                 }
 265
 266                 $item['uri'] = $activity['id'];
 267
 268                 if (($item['parent-uri'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 269                         $item_private = !in_array(0, $activity['item_receiver']);
 270                         $parent = Item::selectFirst(['private'], ['uri' => $item['parent-uri']]);
 271                         if (!DBA::isResult($parent)) {
 272                                 return;
 273                         }
 274                         if ($item_private && !$parent['private']) {
 275                                 Logger::log('Item ' . $item['uri'] . ' is private but the parent ' . $item['parent-uri'] . ' is not. So we drop it.');
 276                                 return;
 277                         }
 278                 }
 279
 280                 $item['created'] = $activity['published'];
 281                 $item['edited'] = $activity['updated'];
 282                 $item['guid'] = $activity['diaspora:guid'];
 283                 $item['title'] = HTML::toBBCode($activity['name']);
 284                 $item['content-warning'] = HTML::toBBCode($activity['summary']);
 285                 $content = self::replaceEmojis($activity['emojis'], HTML::toBBCode($activity['content']));
 286                 $item['body'] = self::convertMentions($content);
 287
 288                 if (($activity['object_type'] == 'as:Video') && !empty($activity['alternate-url'])) {
 289                         $item['body'] .= "\n[video]" . $activity['alternate-url'] . '[/video]';
 290                 }
 291
 292                 $item['location'] = $activity['location'];
 293
 294                 if (!empty($item['latitude']) && !empty($item['longitude'])) {
 295                         $item['coord'] = $item['latitude'] . ' ' . $item['longitude'];
 296                 }
 297
 298                 $item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
 299                 $item['app'] = $activity['generator'];
 300                 $item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
 301
 302                 $item = self::constructAttachList($activity['attachments'], $item);
 303
 304                 if (!empty($activity['source'])) {
 305                         $item['body'] = $activity['source'];
 306                 }
 307
 308                 foreach ($activity['receiver'] as $receiver) {
 309                         $item['uid'] = $receiver;
 310                         $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
 311
 312                         if (($receiver != 0) && empty($item['contact-id'])) {
 313                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
 314                         }
 315
 316                         if ($activity['object_type'] == 'as:Event') {
 317                                 self::createEvent($activity, $item);
 318                         }
 319
 320                         $item_id = Item::insert($item);
 321                         Logger::log('Storing for user ' . $item['uid'] . ': ' . $item_id);
 322                 }
 323         }
 324
 325         /**
 326          * Fetches missing posts
 327          *
 328          * @param $url
 329          * @param $child
 330          */
 331         private static function fetchMissingActivity($url, $child)
 332         {
 333                 if (Config::get('system', 'ostatus_full_threads')) {
 334                         return;
 335                 }
 336
 337                 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 338
 339                 $object = ActivityPub::fetchContent($url, $uid);
 340                 if (empty($object)) {
 341                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 342                         return;
 343                 }
 344
 345                 if (empty($object['id'])) {
 346                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 347                         return;
 348                 }
 349
 350                 $activity = [];
 351                 $activity['@context'] = $object['@context'];
 352                 unset($object['@context']);
 353                 $activity['id'] = $object['id'];
 354                 $activity['to'] = defaults($object, 'to', []);
 355                 $activity['cc'] = defaults($object, 'cc', []);
 356                 $activity['actor'] = $child['author'];
 357                 $activity['object'] = $object;
 358                 $activity['published'] = defaults($object, 'published', $child['published']);
 359                 $activity['type'] = 'Create';
 360
 361                 $ldactivity = JsonLD::compact($activity);
 362
 363                 $ldactivity['thread-completion'] = true;
 364
 365                 ActivityPub\Receiver::processActivity($ldactivity);
 366                 Logger::log('Activity ' . $url . ' had been fetched and processed.');
 367         }
 368
 369         /**
 370          * perform a "follow" request
 371          *
 372          * @param array $activity
 373          */
 374         public static function followUser($activity)
 375         {
 376                 $uid = User::getIdForURL($activity['object_id']);
 377                 if (empty($uid)) {
 378                         return;
 379                 }
 380
 381                 $owner = User::getOwnerDataById($uid);
 382
 383                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 384                 if (!empty($cid)) {
 385                         self::switchContact($cid);
 386                         DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
 387                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 388                 } else {
 389                         $contact = false;
 390                 }
 391
 392                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 393                         'author-link' => $activity['actor']];
 394
 395                 // Ensure that the contact has got the right network type
 396                 self::switchContact($item['author-id']);
 397
 398                 Contact::addRelationship($owner, $contact, $item);
 399                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 400                 if (empty($cid)) {
 401                         return;
 402                 }
 403
 404                 if (empty($contact)) {
 405                         DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
 406                 }
 407
 408                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
 409         }
 410
 411         /**
 412          * Update the given profile
 413          *
 414          * @param array $activity
 415          */
 416         public static function updatePerson($activity)
 417         {
 418                 if (empty($activity['object_id'])) {
 419                         return;
 420                 }
 421
 422                 Logger::log('Updating profile for ' . $activity['object_id'], Logger::DEBUG);
 423                 APContact::getByURL($activity['object_id'], true);
 424         }
 425
 426         /**
 427          * Delete the given profile
 428          *
 429          * @param array $activity
 430          */
 431         public static function deletePerson($activity)
 432         {
 433                 if (empty($activity['object_id']) || empty($activity['actor'])) {
 434                         Logger::log('Empty object id or actor.', Logger::DEBUG);
 435                         return;
 436                 }
 437
 438                 if ($activity['object_id'] != $activity['actor']) {
 439                         Logger::log('Object id does not match actor.', Logger::DEBUG);
 440                         return;
 441                 }
 442
 443                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
 444                 while ($contact = DBA::fetch($contacts)) {
 445                         Contact::remove($contact['id']);
 446                 }
 447                 DBA::close($contacts);
 448
 449                 Logger::log('Deleted contact ' . $activity['object_id'], Logger::DEBUG);
 450         }
 451
 452         /**
 453          * Accept a follow request
 454          *
 455          * @param array $activity
 456          */
 457         public static function acceptFollowUser($activity)
 458         {
 459                 $uid = User::getIdForURL($activity['object_actor']);
 460                 if (empty($uid)) {
 461                         return;
 462                 }
 463
 464                 $owner = User::getOwnerDataById($uid);
 465
 466                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 467                 if (empty($cid)) {
 468                         Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
 469                         return;
 470                 }
 471
 472                 self::switchContact($cid);
 473
 474                 $fields = ['pending' => false];
 475
 476                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
 477                 if ($contact['rel'] == Contact::FOLLOWER) {
 478                         $fields['rel'] = Contact::FRIEND;
 479                 }
 480
 481                 $condition = ['id' => $cid];
 482                 DBA::update('contact', $fields, $condition);
 483                 Logger::log('Accept contact request from contact ' . $cid . ' for user ' . $uid, Logger::DEBUG);
 484         }
 485
 486         /**
 487          * Reject a follow request
 488          *
 489          * @param array $activity
 490          */
 491         public static function rejectFollowUser($activity)
 492         {
 493                 $uid = User::getIdForURL($activity['object_actor']);
 494                 if (empty($uid)) {
 495                         return;
 496                 }
 497
 498                 $owner = User::getOwnerDataById($uid);
 499
 500                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 501                 if (empty($cid)) {
 502                         Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
 503                         return;
 504                 }
 505
 506                 self::switchContact($cid);
 507
 508                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING, 'pending' => true])) {
 509                         Contact::remove($cid);
 510                         Logger::log('Rejected contact request from contact ' . $cid . ' for user ' . $uid . ' - contact had been removed.', Logger::DEBUG);
 511                 } else {
 512                         Logger::log('Rejected contact request from contact ' . $cid . ' for user ' . $uid . '.', Logger::DEBUG);
 513                 }
 514         }
 515
 516         /**
 517          * Undo activity like "like" or "dislike"
 518          *
 519          * @param array $activity
 520          */
 521         public static function undoActivity($activity)
 522         {
 523                 if (empty($activity['object_id'])) {
 524                         return;
 525                 }
 526
 527                 if (empty($activity['object_actor'])) {
 528                         return;
 529                 }
 530
 531                 $author_id = Contact::getIdForURL($activity['object_actor']);
 532                 if (empty($author_id)) {
 533                         return;
 534                 }
 535
 536                 Item::delete(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
 537         }
 538
 539         /**
 540          * Activity to remove a follower
 541          *
 542          * @param array $activity
 543          */
 544         public static function undoFollowUser($activity)
 545         {
 546                 $uid = User::getIdForURL($activity['object_object']);
 547                 if (empty($uid)) {
 548                         return;
 549                 }
 550
 551                 $owner = User::getOwnerDataById($uid);
 552
 553                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 554                 if (empty($cid)) {
 555                         Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
 556                         return;
 557                 }
 558
 559                 self::switchContact($cid);
 560
 561                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
 562                 if (!DBA::isResult($contact)) {
 563                         return;
 564                 }
 565
 566                 Contact::removeFollower($owner, $contact);
 567                 Logger::log('Undo following request from contact ' . $cid . ' for user ' . $uid, Logger::DEBUG);
 568         }
 569
 570         /**
 571          * Switches a contact to AP if needed
 572          *
 573          * @param integer $cid Contact ID
 574          */
 575         private static function switchContact($cid)
 576         {
 577                 $contact = DBA::selectFirst('contact', ['network'], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 578                 if (!DBA::isResult($contact) || ($contact['network'] == Protocol::ACTIVITYPUB)) {
 579                         return;
 580                 }
 581
 582                 Logger::log('Change existing contact ' . $cid . ' from ' . $contact['network'] . ' to ActivityPub.');
 583                 Contact::updateFromProbe($cid, Protocol::ACTIVITYPUB);
 584         }
 585 }