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