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