src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol;
  23
  24 use Friendica\Content\Feature;
  25 use Friendica\Content\PageInfo;
  26 use Friendica\Content\Text\BBCode;
  27 use Friendica\Content\Text\Markdown;
  28 use Friendica\Core\Cache\Duration;
  29 use Friendica\Core\Logger;
  30 use Friendica\Core\Protocol;
  31 use Friendica\Core\System;
  32 use Friendica\Core\Worker;
  33 use Friendica\Database\DBA;
  34 use Friendica\DI;
  35 use Friendica\Model\Contact;
  36 use Friendica\Model\Conversation;
  37 use Friendica\Model\FContact;
  38 use Friendica\Model\Item;
  39 use Friendica\Model\ItemURI;
  40 use Friendica\Model\Mail;
  41 use Friendica\Model\Post;
  42 use Friendica\Model\Tag;
  43 use Friendica\Model\User;
  44 use Friendica\Network\Probe;
  45 use Friendica\Util\Crypto;
  46 use Friendica\Util\DateTimeFormat;
  47 use Friendica\Util\Map;
  48 use Friendica\Util\Network;
  49 use Friendica\Util\Strings;
  50 use Friendica\Util\XML;
  51 use Friendica\Worker\Delivery;
  52 use SimpleXMLElement;
  53
  54 /**
  55  * This class contain functions to create and send Diaspora XML files
  56  */
  57 class Diaspora
  58 {
  59         /**
  60          * Return a list of participating contacts for a thread
  61          *
  62          * This is used for the participation feature.
  63          * One of the parameters is a contact array.
  64          * This is done to avoid duplicates.
  65          *
  66          * @param array $item     Item that is about to be delivered
  67          * @param array $contacts The previously fetched contacts
  68          *
  69          * @return array of relay servers
  70          * @throws \Exception
  71          */
  72         public static function participantsForThread(array $item, array $contacts)
  73         {
  74                 if (!in_array($item['private'], [Item::PUBLIC, Item::UNLISTED]) || in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
  75                         Logger::info('Item is private or a participation request. It will not be relayed', ['guid' => $item['guid'], 'private' => $item['private'], 'verb' => $item['verb']]);
  76                         return $contacts;
  77                 }
  78
  79                 $items = Item::select(['author-id', 'author-link', 'parent-author-link', 'parent-guid', 'guid'],
  80                         ['parent' => $item['parent'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
  81                 while ($item = DBA::fetch($items)) {
  82                         $contact = DBA::selectFirst('contact', ['id', 'url', 'name', 'protocol', 'batch', 'network'],
  83                                 ['id' => $item['author-id']]);
  84                         if (!DBA::isResult($contact) || empty($contact['batch']) ||
  85                                 ($contact['network'] != Protocol::DIASPORA) ||
  86                                 Strings::compareLink($item['parent-author-link'], $item['author-link'])) {
  87                                 continue;
  88                         }
  89
  90                         $exists = false;
  91                         foreach ($contacts as $entry) {
  92                                 if ($entry['batch'] == $contact['batch']) {
  93                                         $exists = true;
  94                                 }
  95                         }
  96
  97                         if (!$exists) {
  98                                 Logger::info('Add participant to receiver list', ['parent' => $item['parent-guid'], 'item' => $item['guid'], 'participant' => $contact['url']]);
  99                                 $contacts[] = $contact;
 100                         }
 101                 }
 102                 DBA::close($items);
 103
 104                 return $contacts;
 105         }
 106
 107         /**
 108          * verify the envelope and return the verified data
 109          *
 110          * @param string $envelope The magic envelope
 111          *
 112          * @return string verified data
 113          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 114          * @throws \ImagickException
 115          */
 116         private static function verifyMagicEnvelope($envelope)
 117         {
 118                 $basedom = XML::parseString($envelope, true);
 119
 120                 if (!is_object($basedom)) {
 121                         Logger::log("Envelope is no XML file");
 122                         return false;
 123                 }
 124
 125                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 126
 127                 if (sizeof($children) == 0) {
 128                         Logger::log("XML has no children");
 129                         return false;
 130                 }
 131
 132                 $handle = "";
 133
 134                 $data = Strings::base64UrlDecode($children->data);
 135                 $type = $children->data->attributes()->type[0];
 136
 137                 $encoding = $children->encoding;
 138
 139                 $alg = $children->alg;
 140
 141                 $sig = Strings::base64UrlDecode($children->sig);
 142                 $key_id = $children->sig->attributes()->key_id[0];
 143                 if ($key_id != "") {
 144                         $handle = Strings::base64UrlDecode($key_id);
 145                 }
 146
 147                 $b64url_data = Strings::base64UrlEncode($data);
 148                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 149
 150                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 151
 152                 if ($handle == '') {
 153                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 154                         return false;
 155                 }
 156
 157                 $key = self::key($handle);
 158                 if ($key == '') {
 159                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 160                         return false;
 161                 }
 162
 163                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 164                 if (!$verify) {
 165                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 166                         return false;
 167                 }
 168
 169                 return $data;
 170         }
 171
 172         /**
 173          * encrypts data via AES
 174          *
 175          * @param string $key  The AES key
 176          * @param string $iv   The IV (is used for CBC encoding)
 177          * @param string $data The data that is to be encrypted
 178          *
 179          * @return string encrypted data
 180          */
 181         private static function aesEncrypt($key, $iv, $data)
 182         {
 183                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 184         }
 185
 186         /**
 187          * decrypts data via AES
 188          *
 189          * @param string $key       The AES key
 190          * @param string $iv        The IV (is used for CBC encoding)
 191          * @param string $encrypted The encrypted data
 192          *
 193          * @return string decrypted data
 194          */
 195         private static function aesDecrypt($key, $iv, $encrypted)
 196         {
 197                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 198         }
 199
 200         /**
 201          * Decodes incoming Diaspora message in the new format
 202          *
 203          * @param string  $raw      raw post message
 204          * @param string  $privKey   The private key of the importer
 205          * @param boolean $no_exit  Don't do an http exit on error
 206          *
 207          * @return array
 208          * 'message' -> decoded Diaspora XML message
 209          * 'author' -> author diaspora handle
 210          * 'key' -> author public key (converted to pkcs#8)
 211          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 212          * @throws \ImagickException
 213          */
 214         public static function decodeRaw(string $raw, string $privKey = '', bool $no_exit = false)
 215         {
 216                 $data = json_decode($raw);
 217
 218                 // Is it a private post? Then decrypt the outer Salmon
 219                 if (is_object($data)) {
 220                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 221                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 222
 223                         $outer_key_bundle = '';
 224                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 225                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 226
 227                         if (!is_object($j_outer_key_bundle)) {
 228                                 Logger::log('Outer Salmon did not verify. Discarding.');
 229                                 if ($no_exit) {
 230                                         return false;
 231                                 } else {
 232                                         throw new \Friendica\Network\HTTPException\BadRequestException();
 233                                 }
 234                         }
 235
 236                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 237                         $outer_key = base64_decode($j_outer_key_bundle->key);
 238
 239                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 240                 } else {
 241                         $xml = $raw;
 242                 }
 243
 244                 $basedom = XML::parseString($xml, true);
 245
 246                 if (!is_object($basedom)) {
 247                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 248                         if ($no_exit) {
 249                                 return false;
 250                         } else {
 251                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 252                         }
 253                 }
 254
 255                 $base = $basedom->children(ActivityNamespace::SALMON_ME);
 256
 257                 // Not sure if this cleaning is needed
 258                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 259
 260                 // Build the signed data
 261                 $type = $base->data[0]->attributes()->type[0];
 262                 $encoding = $base->encoding;
 263                 $alg = $base->alg;
 264                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 265
 266                 // This is the signature
 267                 $signature = Strings::base64UrlDecode($base->sig);
 268
 269                 // Get the senders' public key
 270                 $key_id = $base->sig[0]->attributes()->key_id[0];
 271                 $author_addr = base64_decode($key_id);
 272                 if ($author_addr == '') {
 273                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 274                         if ($no_exit) {
 275                                 return false;
 276                         } else {
 277                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 278                         }
 279                 }
 280
 281                 $key = self::key($author_addr);
 282                 if ($key == '') {
 283                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 284                         if ($no_exit) {
 285                                 return false;
 286                         } else {
 287                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 288                         }
 289                 }
 290
 291                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 292                 if (!$verify) {
 293                         Logger::log('Message did not verify. Discarding.');
 294                         if ($no_exit) {
 295                                 return false;
 296                         } else {
 297                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 298                         }
 299                 }
 300
 301                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 302                                 'author' => XML::unescape($author_addr),
 303                                 'key' => (string)$key];
 304         }
 305
 306         /**
 307          * Decodes incoming Diaspora message in the deprecated format
 308          *
 309          * @param string $xml      urldecoded Diaspora salmon
 310          * @param string $privKey  The private key of the importer
 311          *
 312          * @return array
 313          * 'message' -> decoded Diaspora XML message
 314          * 'author' -> author diaspora handle
 315          * 'key' -> author public key (converted to pkcs#8)
 316          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 317          * @throws \ImagickException
 318          */
 319         public static function decode(string $xml, string $privKey = '')
 320         {
 321                 $public = false;
 322                 $basedom = XML::parseString($xml);
 323
 324                 if (!is_object($basedom)) {
 325                         Logger::notice('XML is not parseable.');
 326                         return false;
 327                 }
 328                 $children = $basedom->children('https://joindiaspora.com/protocol');
 329
 330                 $inner_aes_key = null;
 331                 $inner_iv = null;
 332
 333                 if ($children->header) {
 334                         $public = true;
 335                         $author_link = str_replace('acct:', '', $children->header->author_id);
 336                 } else {
 337                         // This happens with posts from a relais
 338                         if (empty($privKey)) {
 339                                 Logger::info('This is no private post in the old format');
 340                                 return false;
 341                         }
 342
 343                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 344
 345                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 346                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 347
 348                         $outer_key_bundle = '';
 349                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 350
 351                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 352
 353                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 354                         $outer_key = base64_decode($j_outer_key_bundle->key);
 355
 356                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 357
 358                         Logger::info('decrypted', ['data' => $decrypted]);
 359                         $idom = XML::parseString($decrypted);
 360
 361                         $inner_iv = base64_decode($idom->iv);
 362                         $inner_aes_key = base64_decode($idom->aes_key);
 363
 364                         $author_link = str_replace('acct:', '', $idom->author_id);
 365                 }
 366
 367                 $dom = $basedom->children(ActivityNamespace::SALMON_ME);
 368
 369                 // figure out where in the DOM tree our data is hiding
 370
 371                 $base = null;
 372                 if ($dom->provenance->data) {
 373                         $base = $dom->provenance;
 374                 } elseif ($dom->env->data) {
 375                         $base = $dom->env;
 376                 } elseif ($dom->data) {
 377                         $base = $dom;
 378                 }
 379
 380                 if (!$base) {
 381                         Logger::log('unable to locate salmon data in xml');
 382                         throw new \Friendica\Network\HTTPException\BadRequestException();
 383                 }
 384
 385
 386                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 387                 $signature = Strings::base64UrlDecode($base->sig);
 388
 389                 // unpack the  data
 390
 391                 // strip whitespace so our data element will return to one big base64 blob
 392                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 393
 394
 395                 // stash away some other stuff for later
 396
 397                 $type = $base->data[0]->attributes()->type[0];
 398                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 399                 $encoding = $base->encoding;
 400                 $alg = $base->alg;
 401
 402
 403                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 404
 405
 406                 // decode the data
 407                 $data = Strings::base64UrlDecode($data);
 408
 409
 410                 if ($public) {
 411                         $inner_decrypted = $data;
 412                 } else {
 413                         // Decode the encrypted blob
 414                         $inner_encrypted = base64_decode($data);
 415                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 416                 }
 417
 418                 if (!$author_link) {
 419                         Logger::log('Could not retrieve author URI.');
 420                         throw new \Friendica\Network\HTTPException\BadRequestException();
 421                 }
 422                 // Once we have the author URI, go to the web and try to find their public key
 423                 // (first this will look it up locally if it is in the fcontact cache)
 424                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 425
 426                 Logger::log('Fetching key for '.$author_link);
 427                 $key = self::key($author_link);
 428
 429                 if (!$key) {
 430                         Logger::log('Could not retrieve author key.');
 431                         throw new \Friendica\Network\HTTPException\BadRequestException();
 432                 }
 433
 434                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 435
 436                 if (!$verify) {
 437                         Logger::log('Message did not verify. Discarding.');
 438                         throw new \Friendica\Network\HTTPException\BadRequestException();
 439                 }
 440
 441                 Logger::log('Message verified.');
 442
 443                 return ['message' => (string)$inner_decrypted,
 444                                 'author' => XML::unescape($author_link),
 445                                 'key' => (string)$key];
 446         }
 447
 448
 449         /**
 450          * Dispatches public messages and find the fitting receivers
 451          *
 452          * @param array $msg     The post that will be dispatched
 453          * @param bool  $fetched The message had been fetched (default "false")
 454          *
 455          * @return int The message id of the generated message, "true" or "false" if there was an error
 456          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 457          * @throws \ImagickException
 458          */
 459         public static function dispatchPublic($msg, bool $fetched = false)
 460         {
 461                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
 462                 if (!$enabled) {
 463                         Logger::log("diaspora is disabled");
 464                         return false;
 465                 }
 466
 467                 if (!($fields = self::validPosting($msg))) {
 468                         Logger::log("Invalid posting");
 469                         return false;
 470                 }
 471
 472                 $importer = ["uid" => 0, "page-flags" => User::PAGE_FLAGS_FREELOVE];
 473                 $success = self::dispatch($importer, $msg, $fields, $fetched);
 474
 475                 return $success;
 476         }
 477
 478         /**
 479          * Dispatches the different message types to the different functions
 480          *
 481          * @param array            $importer Array of the importer user
 482          * @param array            $msg      The post that will be dispatched
 483          * @param SimpleXMLElement $fields   SimpleXML object that contains the message
 484          * @param bool             $fetched  The message had been fetched (default "false")
 485          *
 486          * @return int The message id of the generated message, "true" or "false" if there was an error
 487          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 488          * @throws \ImagickException
 489          */
 490         public static function dispatch(array $importer, $msg, SimpleXMLElement $fields = null, bool $fetched = false)
 491         {
 492                 // The sender is the handle of the contact that sent the message.
 493                 // This will often be different with relayed messages (for example "like" and "comment")
 494                 $sender = $msg["author"];
 495
 496                 // This is only needed for private postings since this is already done for public ones before
 497                 if (is_null($fields)) {
 498                         $private = true;
 499                         if (!($fields = self::validPosting($msg))) {
 500                                 Logger::log("Invalid posting");
 501                                 return false;
 502                         }
 503                 } else {
 504                         $private = false;
 505                 }
 506
 507                 $type = $fields->getName();
 508
 509                 Logger::info('Received message', ['type' => $type, 'sender' => $sender, 'user' => $importer["uid"]]);
 510
 511                 switch ($type) {
 512                         case "account_migration":
 513                                 if (!$private) {
 514                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 515                                         return false;
 516                                 }
 517                                 return self::receiveAccountMigration($importer, $fields);
 518
 519                         case "account_deletion":
 520                                 return self::receiveAccountDeletion($fields);
 521
 522                         case "comment":
 523                                 return self::receiveComment($importer, $sender, $fields, $msg["message"], $fetched);
 524
 525                         case "contact":
 526                                 if (!$private) {
 527                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 528                                         return false;
 529                                 }
 530                                 return self::receiveContactRequest($importer, $fields);
 531
 532                         case "conversation":
 533                                 if (!$private) {
 534                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 535                                         return false;
 536                                 }
 537                                 return self::receiveConversation($importer, $msg, $fields);
 538
 539                         case "like":
 540                                 return self::receiveLike($importer, $sender, $fields);
 541
 542                         case "message":
 543                                 if (!$private) {
 544                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 545                                         return false;
 546                                 }
 547                                 return self::receiveMessage($importer, $fields);
 548
 549                         case "participation":
 550                                 if (!$private) {
 551                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 552                                         return false;
 553                                 }
 554                                 return self::receiveParticipation($importer, $fields);
 555
 556                         case "photo": // Not implemented
 557                                 return self::receivePhoto($importer, $fields);
 558
 559                         case "poll_participation": // Not implemented
 560                                 return self::receivePollParticipation($importer, $fields);
 561
 562                         case "profile":
 563                                 if (!$private) {
 564                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 565                                         return false;
 566                                 }
 567                                 return self::receiveProfile($importer, $fields);
 568
 569                         case "reshare":
 570                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 571
 572                         case "retraction":
 573                                 return self::receiveRetraction($importer, $sender, $fields);
 574
 575                         case "status_message":
 576                                 return self::receiveStatusMessage($importer, $fields, $msg["message"], $fetched);
 577
 578                         default:
 579                                 Logger::log("Unknown message type ".$type);
 580                                 return false;
 581                 }
 582         }
 583
 584         /**
 585          * Checks if a posting is valid and fetches the data fields.
 586          *
 587          * This function does not only check the signature.
 588          * It also does the conversion between the old and the new diaspora format.
 589          *
 590          * @param array $msg Array with the XML, the sender handle and the sender signature
 591          *
 592          * @return bool|SimpleXMLElement If the posting is valid then an array with an SimpleXML object is returned
 593          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 594          * @throws \ImagickException
 595          */
 596         private static function validPosting($msg)
 597         {
 598                 $data = XML::parseString($msg["message"]);
 599
 600                 if (!is_object($data)) {
 601                         Logger::info('No valid XML', ['message' => $msg['message']]);
 602                         return false;
 603                 }
 604
 605                 // Is this the new or the old version?
 606                 if ($data->getName() == "XML") {
 607                         $oldXML = true;
 608                         foreach ($data->post->children() as $child) {
 609                                 $element = $child;
 610                         }
 611                 } else {
 612                         $oldXML = false;
 613                         $element = $data;
 614                 }
 615
 616                 $type = $element->getName();
 617                 $orig_type = $type;
 618
 619                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 620
 621                 // All retractions are handled identically from now on.
 622                 // In the new version there will only be "retraction".
 623                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 624                         $type = "retraction";
 625
 626                 if ($type == "request") {
 627                         $type = "contact";
 628                 }
 629
 630                 $fields = new SimpleXMLElement("<".$type."/>");
 631
 632                 $signed_data = "";
 633                 $author_signature = null;
 634                 $parent_author_signature = null;
 635
 636                 foreach ($element->children() as $fieldname => $entry) {
 637                         if ($oldXML) {
 638                                 // Translation for the old XML structure
 639                                 if ($fieldname == "diaspora_handle") {
 640                                         $fieldname = "author";
 641                                 }
 642                                 if ($fieldname == "participant_handles") {
 643                                         $fieldname = "participants";
 644                                 }
 645                                 if (in_array($type, ["like", "participation"])) {
 646                                         if ($fieldname == "target_type") {
 647                                                 $fieldname = "parent_type";
 648                                         }
 649                                 }
 650                                 if ($fieldname == "sender_handle") {
 651                                         $fieldname = "author";
 652                                 }
 653                                 if ($fieldname == "recipient_handle") {
 654                                         $fieldname = "recipient";
 655                                 }
 656                                 if ($fieldname == "root_diaspora_id") {
 657                                         $fieldname = "root_author";
 658                                 }
 659                                 if ($type == "status_message") {
 660                                         if ($fieldname == "raw_message") {
 661                                                 $fieldname = "text";
 662                                         }
 663                                 }
 664                                 if ($type == "retraction") {
 665                                         if ($fieldname == "post_guid") {
 666                                                 $fieldname = "target_guid";
 667                                         }
 668                                         if ($fieldname == "type") {
 669                                                 $fieldname = "target_type";
 670                                         }
 671                                 }
 672                         }
 673
 674                         if (($fieldname == "author_signature") && ($entry != "")) {
 675                                 $author_signature = base64_decode($entry);
 676                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 677                                 $parent_author_signature = base64_decode($entry);
 678                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 679                                 if ($signed_data != "") {
 680                                         $signed_data .= ";";
 681                                 }
 682
 683                                 $signed_data .= $entry;
 684                         }
 685                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 686                                 || ($orig_type == "relayable_retraction")
 687                         ) {
 688                                 XML::copy($entry, $fields, $fieldname);
 689                         }
 690                 }
 691
 692                 // This is something that shouldn't happen at all.
 693                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 694                         if ($msg["author"] != $fields->author) {
 695                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 696                                 return false;
 697                         }
 698                 }
 699
 700                 // Only some message types have signatures. So we quit here for the other types.
 701                 if (!in_array($type, ["comment", "like"])) {
 702                         return $fields;
 703                 }
 704                 // No author_signature? This is a must, so we quit.
 705                 if (!isset($author_signature)) {
 706                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 707                         return false;
 708                 }
 709
 710                 if (isset($parent_author_signature)) {
 711                         $key = self::key($msg["author"]);
 712                         if (empty($key)) {
 713                                 Logger::info('No key found for parent', ['author' => $msg["author"]]);
 714                                 return false;
 715                         }
 716
 717                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 718                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 719                                 return false;
 720                         }
 721                 }
 722
 723                 $key = self::key($fields->author);
 724                 if (empty($key)) {
 725                         Logger::info('No key found', ['author' => $fields->author]);
 726                         return false;
 727                 }
 728
 729                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 730                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 731                         return false;
 732                 } else {
 733                         return $fields;
 734                 }
 735         }
 736
 737         /**
 738          * Fetches the public key for a given handle
 739          *
 740          * @param string $handle The handle
 741          *
 742          * @return string The public key
 743          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 744          * @throws \ImagickException
 745          */
 746         private static function key($handle)
 747         {
 748                 $handle = strval($handle);
 749
 750                 Logger::log("Fetching diaspora key for: ".$handle);
 751
 752                 $r = FContact::getByURL($handle);
 753                 if ($r) {
 754                         return $r["pubkey"];
 755                 }
 756
 757                 return "";
 758         }
 759
 760         /**
 761          * get a handle (user@domain.tld) from a given contact id
 762          *
 763          * @param int $contact_id  The id in the contact table
 764          * @param int $pcontact_id The id in the contact table (Used for the public contact)
 765          *
 766          * @return string the handle
 767          * @throws \Exception
 768          */
 769         private static function handleFromContact($contact_id, $pcontact_id = 0)
 770         {
 771                 $handle = false;
 772
 773                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
 774
 775                 if ($pcontact_id != 0) {
 776                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
 777
 778                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
 779                                 return strtolower($contact["addr"]);
 780                         }
 781                 }
 782
 783                 $r = q(
 784                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 785                         intval($contact_id)
 786                 );
 787
 788                 if (DBA::isResult($r)) {
 789                         $contact = $r[0];
 790
 791                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
 792
 793                         if ($contact['addr'] != "") {
 794                                 $handle = $contact['addr'];
 795                         } else {
 796                                 $baseurl_start = strpos($contact['url'], '://') + 3;
 797                                 // allows installations in a subdirectory--not sure how Diaspora will handle
 798                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
 799                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 800                                 $handle = $contact['nick'].'@'.$baseurl;
 801                         }
 802                 }
 803
 804                 return strtolower($handle);
 805         }
 806
 807         /**
 808          * Get a contact id for a given handle
 809          *
 810          * @todo  Move to Friendica\Model\Contact
 811          *
 812          * @param int    $uid    The user id
 813          * @param string $handle The handle in the format user@domain.tld
 814          *
 815          * @return array Contact data
 816          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 817          * @throws \ImagickException
 818          */
 819         private static function contactByHandle($uid, $handle)
 820         {
 821                 return Contact::getByURL($handle, null, [], $uid);
 822         }
 823
 824         /**
 825          * Checks if the given contact url does support ActivityPub
 826          *
 827          * @param string  $url    profile url
 828          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
 829          * @return boolean
 830          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 831          * @throws \ImagickException
 832          */
 833         public static function isSupportedByContactUrl($url, $update = null)
 834         {
 835                 return !empty(FContact::getByURL($url, $update));
 836         }
 837
 838         /**
 839          * Check if posting is allowed for this contact
 840          *
 841          * @param array $importer   Array of the importer user
 842          * @param array $contact    The contact that is checked
 843          * @param bool  $is_comment Is the check for a comment?
 844          *
 845          * @return bool is the contact allowed to post?
 846          */
 847         private static function postAllow(array $importer, array $contact, $is_comment = false)
 848         {
 849                 /*
 850                  * Perhaps we were already sharing with this person. Now they're sharing with us.
 851                  * That makes us friends.
 852                  * Normally this should have handled by getting a request - but this could get lost
 853                  */
 854                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
 855                 // It is not removed by now. Possibly the code is needed?
 856                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(User::PAGE_FLAGS_FREELOVE))) {
 857                 //      DBA::update(
 858                 //              'contact',
 859                 //              array('rel' => Contact::FRIEND, 'writable' => true),
 860                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
 861                 //      );
 862                 //
 863                 //      $contact["rel"] = Contact::FRIEND;
 864                 //      Logger::log("defining user ".$contact["nick"]." as friend");
 865                 //}
 866
 867                 // Contact server is blocked
 868                 if (Network::isUrlBlocked($contact['url'])) {
 869                         return false;
 870                         // We don't seem to like that person
 871                 } elseif ($contact["blocked"]) {
 872                         // Maybe blocked, don't accept.
 873                         return false;
 874                         // We are following this person?
 875                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
 876                         // Yes, then it is fine.
 877                         return true;
 878                         // Is it a post to a community?
 879                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
 880                         // That's good
 881                         return true;
 882                         // Is the message a global user or a comment?
 883                 } elseif (($importer["uid"] == 0) || $is_comment) {
 884                         // Messages for the global users and comments are always accepted
 885                         return true;
 886                 }
 887
 888                 return false;
 889         }
 890
 891         /**
 892          * Fetches the contact id for a handle and checks if posting is allowed
 893          *
 894          * @param array  $importer   Array of the importer user
 895          * @param string $handle     The checked handle in the format user@domain.tld
 896          * @param bool   $is_comment Is the check for a comment?
 897          *
 898          * @return array The contact data
 899          * @throws \Exception
 900          */
 901         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
 902         {
 903                 $contact = self::contactByHandle($importer["uid"], $handle);
 904                 if (!$contact) {
 905                         Logger::log("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
 906                         // If a contact isn't found, we accept it anyway if it is a comment
 907                         if ($is_comment && ($importer["uid"] != 0)) {
 908                                 return self::contactByHandle(0, $handle);
 909                         } elseif ($is_comment) {
 910                                 return $importer;
 911                         } else {
 912                                 return false;
 913                         }
 914                 }
 915
 916                 if (!self::postAllow($importer, $contact, $is_comment)) {
 917                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
 918                         return false;
 919                 }
 920                 return $contact;
 921         }
 922
 923         /**
 924          * Does the message already exists on the system?
 925          *
 926          * @param int    $uid  The user id
 927          * @param string $guid The guid of the message
 928          *
 929          * @return int|bool message id if the message already was stored into the system - or false.
 930          * @throws \Exception
 931          */
 932         private static function messageExists($uid, $guid)
 933         {
 934                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
 935                 if (DBA::isResult($item)) {
 936                         Logger::log("message ".$guid." already exists for user ".$uid);
 937                         return $item["id"];
 938                 }
 939
 940                 return false;
 941         }
 942
 943         /**
 944          * Checks for links to posts in a message
 945          *
 946          * @param array $item The item array
 947          * @return void
 948          */
 949         private static function fetchGuid(array $item)
 950         {
 951                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
 952                 preg_replace_callback(
 953                         $expression,
 954                         function ($match) use ($item) {
 955                                 self::fetchGuidSub($match, $item);
 956                         },
 957                         $item["body"]
 958                 );
 959
 960                 preg_replace_callback(
 961                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
 962                         function ($match) use ($item) {
 963                                 self::fetchGuidSub($match, $item);
 964                         },
 965                         $item["body"]
 966                 );
 967         }
 968
 969         /**
 970          * Checks for relative /people/* links in an item body to match local
 971          * contacts or prepends the remote host taken from the author link.
 972          *
 973          * @param string $body        The item body to replace links from
 974          * @param string $author_link The author link for missing local contact fallback
 975          *
 976          * @return string the replaced string
 977          */
 978         public static function replacePeopleGuid($body, $author_link)
 979         {
 980                 $return = preg_replace_callback(
 981                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
 982                         function ($match) use ($author_link) {
 983                                 // $match
 984                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
 985                                 // 1 => '0123456789abcdef'
 986                                 // 2 => 'Foo Bar'
 987                                 $handle = FContact::getUrlByGuid($match[1]);
 988
 989                                 if ($handle) {
 990                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
 991                                 } else {
 992                                         // No local match, restoring absolute remote URL from author scheme and host
 993                                         $author_url = parse_url($author_link);
 994                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
 995                                 }
 996
 997                                 return $return;
 998                         },
 999                         $body
1000                 );
1001
1002                 return $return;
1003         }
1004
1005         /**
1006          * sub function of "fetchGuid" which checks for links in messages
1007          *
1008          * @param array $match array containing a link that has to be checked for a message link
1009          * @param array $item  The item array
1010          * @return void
1011          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1012          * @throws \ImagickException
1013          */
1014         private static function fetchGuidSub($match, $item)
1015         {
1016                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1017                         self::storeByGuid($match[1], $item["owner-link"]);
1018                 }
1019         }
1020
1021         /**
1022          * Fetches an item with a given guid from a given server
1023          *
1024          * @param string $guid   the message guid
1025          * @param string $server The server address
1026          * @param int    $uid    The user id of the user
1027          *
1028          * @return int the message id of the stored message or false
1029          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1030          * @throws \ImagickException
1031          */
1032         private static function storeByGuid($guid, $server, $uid = 0)
1033         {
1034                 $serverparts = parse_url($server);
1035
1036                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1037                         return false;
1038                 }
1039
1040                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1041
1042                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1043
1044                 $msg = self::message($guid, $server);
1045
1046                 if (!$msg) {
1047                         return false;
1048                 }
1049
1050                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1051
1052                 // Now call the dispatcher
1053                 return self::dispatchPublic($msg, true);
1054         }
1055
1056         /**
1057          * Fetches a message from a server
1058          *
1059          * @param string $guid   message guid
1060          * @param string $server The url of the server
1061          * @param int    $level  Endless loop prevention
1062          *
1063          * @return array
1064          *      'message' => The message XML
1065          *      'author' => The author handle
1066          *      'key' => The public key of the author
1067          * @throws \Exception
1068          */
1069         private static function message($guid, $server, $level = 0)
1070         {
1071                 if ($level > 5) {
1072                         return false;
1073                 }
1074
1075                 // This will work for new Diaspora servers and Friendica servers from 3.5
1076                 $source_url = $server."/fetch/post/".urlencode($guid);
1077
1078                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1079
1080                 $envelope = DI::httpRequest()->fetch($source_url);
1081                 if ($envelope) {
1082                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1083                         $x = self::verifyMagicEnvelope($envelope);
1084                         if (!$x) {
1085                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1086                         } else {
1087                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1088                         }
1089                 } else {
1090                         $x = false;
1091                 }
1092
1093                 if (!$x) {
1094                         return false;
1095                 }
1096
1097                 $source_xml = XML::parseString($x);
1098
1099                 if (!is_object($source_xml)) {
1100                         return false;
1101                 }
1102
1103                 if ($source_xml->post->reshare) {
1104                         // Reshare of a reshare - old Diaspora version
1105                         Logger::log("Message is a reshare", Logger::DEBUG);
1106                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1107                 } elseif ($source_xml->getName() == "reshare") {
1108                         // Reshare of a reshare - new Diaspora version
1109                         Logger::log("Message is a new reshare", Logger::DEBUG);
1110                         return self::message($source_xml->root_guid, $server, ++$level);
1111                 }
1112
1113                 $author = "";
1114
1115                 // Fetch the author - for the old and the new Diaspora version
1116                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1117                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1118                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1119                         $author = (string)$source_xml->author;
1120                 }
1121
1122                 // If this isn't a "status_message" then quit
1123                 if (!$author) {
1124                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1125                         return false;
1126                 }
1127
1128                 $msg = ["message" => $x, "author" => $author];
1129
1130                 $msg["key"] = self::key($msg["author"]);
1131
1132                 return $msg;
1133         }
1134
1135         /**
1136          * Fetches an item with a given URL
1137          *
1138          * @param string $url the message url
1139          *
1140          * @return int the message id of the stored message or false
1141          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1142          * @throws \ImagickException
1143          */
1144         public static function fetchByURL($url, $uid = 0)
1145         {
1146                 // Check for Diaspora (and Friendica) typical paths
1147                 if (!preg_match("=(https?://.+)/(?:posts|display|objects)/([a-zA-Z0-9-_@.:%]+[a-zA-Z0-9])=i", $url, $matches)) {
1148                         Logger::info('Invalid url', ['url' => $url]);
1149                         return false;
1150                 }
1151
1152                 $guid = urldecode($matches[2]);
1153
1154                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1155                 if (DBA::isResult($item)) {
1156                         Logger::info('Found', ['id' => $item['id']]);
1157                         return $item['id'];
1158                 }
1159
1160                 Logger::info('Fetch GUID from origin', ['guid' => $guid, 'server' => $matches[1]]);
1161                 $ret = self::storeByGuid($guid, $matches[1], $uid);
1162                 Logger::info('Result', ['ret' => $ret]);
1163
1164                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1165                 if (DBA::isResult($item)) {
1166                         Logger::info('Found', ['id' => $item['id']]);
1167                         return $item['id'];
1168                 } else {
1169                         Logger::info('Not found', ['guid' => $guid, 'uid' => $uid]);
1170                         return false;
1171                 }
1172         }
1173
1174         /**
1175          * Fetches the item record of a given guid
1176          *
1177          * @param int    $uid     The user id
1178          * @param string $guid    message guid
1179          * @param string $author  The handle of the item
1180          * @param array  $contact The contact of the item owner
1181          *
1182          * @return array the item record
1183          * @throws \Exception
1184          */
1185         private static function parentItem($uid, $guid, $author, array $contact)
1186         {
1187                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1188                         'author-name', 'author-link', 'author-avatar', 'gravity',
1189                         'owner-name', 'owner-link', 'owner-avatar'];
1190                 $condition = ['uid' => $uid, 'guid' => $guid];
1191                 $item = Item::selectFirst($fields, $condition);
1192
1193                 if (!DBA::isResult($item)) {
1194                         $person = FContact::getByURL($author);
1195                         $result = self::storeByGuid($guid, $person["url"], $uid);
1196
1197                         // We don't have an url for items that arrived at the public dispatcher
1198                         if (!$result && !empty($contact["url"])) {
1199                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1200                         }
1201
1202                         if ($result) {
1203                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1204
1205                                 $item = Item::selectFirst($fields, $condition);
1206                         }
1207                 }
1208
1209                 if (!DBA::isResult($item)) {
1210                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1211                         return false;
1212                 } else {
1213                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1214                         return $item;
1215                 }
1216         }
1217
1218         /**
1219          * returns contact details
1220          *
1221          * @param array $def_contact The default contact if the person isn't found
1222          * @param array $person      The record of the person
1223          * @param int   $uid         The user id
1224          *
1225          * @return array
1226          *      'cid' => contact id
1227          *      'network' => network type
1228          * @throws \Exception
1229          */
1230         private static function authorContactByUrl($def_contact, $person, $uid)
1231         {
1232                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1233                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1234                 if (DBA::isResult($contact)) {
1235                         $cid = $contact["id"];
1236                         $network = $contact["network"];
1237                 } else {
1238                         $cid = $def_contact["id"];
1239                         $network = Protocol::DIASPORA;
1240                 }
1241
1242                 return ["cid" => $cid, "network" => $network];
1243         }
1244
1245         /**
1246          * Is the profile a hubzilla profile?
1247          *
1248          * @param string $url The profile link
1249          *
1250          * @return bool is it a hubzilla server?
1251          */
1252         private static function isHubzilla($url)
1253         {
1254                 return(strstr($url, '/channel/'));
1255         }
1256
1257         /**
1258          * Generate a post link with a given handle and message guid
1259          *
1260          * @param string $addr        The user handle
1261          * @param string $guid        message guid
1262          * @param string $parent_guid optional parent guid
1263          *
1264          * @return string the post link
1265          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1266          * @throws \ImagickException
1267          */
1268         private static function plink($addr, $guid, $parent_guid = '')
1269         {
1270                 $contact = Contact::getByURL($addr);
1271                 if (empty($contact)) {
1272                         Logger::info('No contact data for address', ['addr' => $addr]);
1273                         return '';
1274                 }
1275
1276                 if (empty($contact['baseurl'])) {
1277                         $contact['baseurl'] = 'https://' . substr($addr, strpos($addr, '@') + 1);
1278                         Logger::info('Create baseurl from address', ['baseurl' => $contact['baseurl'], 'url' => $contact['url']]);
1279                 }
1280
1281                 $platform = '';
1282                 $gserver = DBA::selectFirst('gserver', ['platform'], ['nurl' => Strings::normaliseLink($contact['baseurl'])]);
1283                 if (!empty($gserver['platform'])) {
1284                         $platform = strtolower($gserver['platform']);
1285                         Logger::info('Detected platform', ['platform' => $platform, 'url' => $contact['url']]);
1286                 }
1287
1288                 if (!in_array($platform, ['diaspora', 'friendica', 'hubzilla', 'socialhome'])) {
1289                         if (self::isHubzilla($contact['url'])) {
1290                                 Logger::info('Detected unknown platform as Hubzilla', ['platform' => $platform, 'url' => $contact['url']]);
1291                                 $platform = 'hubzilla';
1292                         } elseif ($contact['network'] == Protocol::DFRN) {
1293                                 Logger::info('Detected unknown platform as Friendica', ['platform' => $platform, 'url' => $contact['url']]);
1294                                 $platform = 'friendica';
1295                         }
1296                 }
1297
1298                 if ($platform == 'friendica') {
1299                         return str_replace('/profile/' . $contact['nick'] . '/', '/display/' . $guid, $contact['url'] . '/');
1300                 }
1301
1302                 if ($platform == 'hubzilla') {
1303                         return $contact['baseurl'] . '/item/' . $guid;
1304                 }
1305
1306                 if ($platform == 'socialhome') {
1307                         return $contact['baseurl'] . '/content/' . $guid;
1308                 }
1309
1310                 if ($platform != 'diaspora') {
1311                         Logger::info('Unknown platform', ['platform' => $platform, 'url' => $contact['url']]);
1312                         return '';
1313                 }
1314
1315                 if ($parent_guid != '') {
1316                         return $contact['baseurl'] . '/posts/' . $parent_guid . '#' . $guid;
1317                 } else {
1318                         return $contact['baseurl'] . '/posts/' . $guid;
1319                 }
1320         }
1321
1322         /**
1323          * Receives account migration
1324          *
1325          * @param array  $importer Array of the importer user
1326          * @param object $data     The message object
1327          *
1328          * @return bool Success
1329          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1330          * @throws \ImagickException
1331          */
1332         private static function receiveAccountMigration(array $importer, $data)
1333         {
1334                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1335                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1336                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1337
1338                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1339                 if (!$contact) {
1340                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1341                         return false;
1342                 }
1343
1344                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1345
1346                 // Check signature
1347                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1348                 $key = self::key($old_handle);
1349                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1350                         Logger::log('No valid signature for migration.');
1351                         return false;
1352                 }
1353
1354                 // Update the profile
1355                 self::receiveProfile($importer, $data->profile);
1356
1357                 // change the technical stuff in contact
1358                 $data = Probe::uri($new_handle);
1359                 if ($data['network'] == Protocol::PHANTOM) {
1360                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1361                         return false;
1362                 }
1363
1364                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1365                                 'name' => $data['name'], 'nick' => $data['nick'],
1366                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1367                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1368                                 'network' => $data['network']];
1369
1370                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1371
1372                 Logger::log('Contacts are updated.');
1373
1374                 return true;
1375         }
1376
1377         /**
1378          * Processes an account deletion
1379          *
1380          * @param object $data The message object
1381          *
1382          * @return bool Success
1383          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1384          */
1385         private static function receiveAccountDeletion($data)
1386         {
1387                 $author = Strings::escapeTags(XML::unescape($data->author));
1388
1389                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1390                 while ($contact = DBA::fetch($contacts)) {
1391                         Contact::remove($contact["id"]);
1392                 }
1393                 DBA::close($contacts);
1394
1395                 Logger::log('Removed contacts for ' . $author);
1396
1397                 return true;
1398         }
1399
1400         /**
1401          * Fetch the uri from our database if we already have this item (maybe from ourselves)
1402          *
1403          * @param string  $author    Author handle
1404          * @param string  $guid      Message guid
1405          * @param boolean $onlyfound Only return uri when found in the database
1406          *
1407          * @return string The constructed uri or the one from our database
1408          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1409          * @throws \ImagickException
1410          */
1411         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1412         {
1413                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1414                 if (DBA::isResult($item)) {
1415                         return $item["uri"];
1416                 } elseif (!$onlyfound) {
1417                         $person = FContact::getByURL($author);
1418
1419                         $parts = parse_url($person['url']);
1420                         unset($parts['path']);
1421                         $host_url = Network::unparseURL($parts);
1422
1423                         return $host_url . '/objects/' . $guid;
1424                 }
1425
1426                 return "";
1427         }
1428
1429         /**
1430          * Fetch the guid from our database with a given uri
1431          *
1432          * @param string $uri Message uri
1433          * @param string $uid Author handle
1434          *
1435          * @return string The post guid
1436          * @throws \Exception
1437          */
1438         private static function getGuidFromUri($uri, $uid)
1439         {
1440                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1441                 if (DBA::isResult($item)) {
1442                         return $item["guid"];
1443                 } else {
1444                         return false;
1445                 }
1446         }
1447
1448         /**
1449          * Store the mentions in the tag table
1450          *
1451          * @param integer $uriid
1452          * @param string $text
1453          */
1454         private static function storeMentions(int $uriid, string $text)
1455         {
1456                 preg_match_all('/([@!]){(?:([^}]+?); ?)?([^} ]+)}/', $text, $matches, PREG_SET_ORDER);
1457                 if (empty($matches)) {
1458                         return;
1459                 }
1460
1461                 /*
1462                  * Matching values for the preg match
1463                  * [1] = mention type (@ or !)
1464                  * [2] = name (optional)
1465                  * [3] = profile URL
1466                  */
1467
1468                 foreach ($matches as $match) {
1469                         if (empty($match)) {
1470                                 continue;
1471                         }
1472
1473                         $person = FContact::getByURL($match[3]);
1474                         if (empty($person)) {
1475                                 continue;
1476                         }
1477
1478                         Tag::storeByHash($uriid, $match[1], $person['name'] ?: $person['nick'], $person['url']);
1479                 }
1480         }
1481
1482         /**
1483          * Processes an incoming comment
1484          *
1485          * @param array  $importer Array of the importer user
1486          * @param string $sender   The sender of the message
1487          * @param object $data     The message object
1488          * @param string $xml      The original XML of the message
1489          * @param bool   $fetched  The message had been fetched and not pushed
1490          *
1491          * @return int The message id of the generated comment or "false" if there was an error
1492          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1493          * @throws \ImagickException
1494          */
1495         private static function receiveComment(array $importer, $sender, $data, $xml, bool $fetched)
1496         {
1497                 $author = Strings::escapeTags(XML::unescape($data->author));
1498                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1499                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1500                 $text = XML::unescape($data->text);
1501
1502                 if (isset($data->created_at)) {
1503                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1504                 } else {
1505                         $created_at = DateTimeFormat::utcNow();
1506                 }
1507
1508                 if (isset($data->thread_parent_guid)) {
1509                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1510                         $thr_parent = self::getUriFromGuid("", $thread_parent_guid, true);
1511                 } else {
1512                         $thr_parent = "";
1513                 }
1514
1515                 $contact = self::allowedContactByHandle($importer, $sender, true);
1516                 if (!$contact) {
1517                         return false;
1518                 }
1519
1520                 $message_id = self::messageExists($importer["uid"], $guid);
1521                 if ($message_id) {
1522                         return true;
1523                 }
1524
1525                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1526                 if (!$toplevel_parent_item) {
1527                         return false;
1528                 }
1529
1530                 $person = FContact::getByURL($author);
1531                 if (!is_array($person)) {
1532                         Logger::log("unable to find author details");
1533                         return false;
1534                 }
1535
1536                 // Fetch the contact id - if we know this contact
1537                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1538
1539                 $datarray = [];
1540
1541                 $datarray["uid"] = $importer["uid"];
1542                 $datarray["contact-id"] = $author_contact["cid"];
1543                 $datarray["network"]  = $author_contact["network"];
1544
1545                 $datarray["author-link"] = $person["url"];
1546                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1547
1548                 $datarray["owner-link"] = $contact["url"];
1549                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1550
1551                 // Will be overwritten for sharing accounts in Item::insert
1552                 if ($fetched) {
1553                         $datarray["post-type"] = Item::PT_FETCHED;
1554                 } elseif ($datarray["uid"] == 0) {
1555                         $datarray["post-type"] = Item::PT_GLOBAL;
1556                 } else {
1557                         $datarray["post-type"] = Item::PT_COMMENT;
1558                 }
1559
1560                 $datarray["guid"] = $guid;
1561                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1562                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
1563
1564                 $datarray["verb"] = Activity::POST;
1565                 $datarray["gravity"] = GRAVITY_COMMENT;
1566
1567                 $datarray['thr-parent'] = $thr_parent ?: $toplevel_parent_item['uri'];
1568                 $datarray['parent-uri'] = $toplevel_parent_item['uri'];
1569
1570                 $datarray["object-type"] = Activity\ObjectType::COMMENT;
1571
1572                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1573                 $datarray["source"] = $xml;
1574
1575                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1576
1577                 $datarray["plink"] = self::plink($author, $guid, $toplevel_parent_item['guid']);
1578                 $body = Markdown::toBBCode($text);
1579
1580                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1581
1582                 self::storeMentions($datarray['uri-id'], $text);
1583                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
1584
1585                 self::fetchGuid($datarray);
1586
1587                 // If we are the origin of the parent we store the original data.
1588                 // We notify our followers during the item storage.
1589                 if ($toplevel_parent_item["origin"]) {
1590                         $datarray['diaspora_signed_text'] = json_encode($data);
1591                 }
1592
1593                 $message_id = Item::insert($datarray);
1594
1595                 if ($message_id <= 0) {
1596                         return false;
1597                 }
1598
1599                 if ($message_id) {
1600                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1601                         if ($datarray['uid'] == 0) {
1602                                 Item::distribute($message_id, json_encode($data));
1603                         }
1604                 }
1605
1606                 return true;
1607         }
1608
1609         /**
1610          * processes and stores private messages
1611          *
1612          * @param array  $importer     Array of the importer user
1613          * @param array  $contact      The contact of the message
1614          * @param object $data         The message object
1615          * @param array  $msg          Array of the processed message, author handle and key
1616          * @param object $mesg         The private message
1617          * @param array  $conversation The conversation record to which this message belongs
1618          *
1619          * @return bool "true" if it was successful
1620          * @throws \Exception
1621          */
1622         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1623         {
1624                 $author = Strings::escapeTags(XML::unescape($data->author));
1625                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1626                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1627
1628                 // "diaspora_handle" is the element name from the old version
1629                 // "author" is the element name from the new version
1630                 if ($mesg->author) {
1631                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1632                 } elseif ($mesg->diaspora_handle) {
1633                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1634                 } else {
1635                         return false;
1636                 }
1637
1638                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1639                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1640                 $msg_text = XML::unescape($mesg->text);
1641                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1642
1643                 if ($msg_conversation_guid != $guid) {
1644                         Logger::log("message conversation guid does not belong to the current conversation.");
1645                         return false;
1646                 }
1647
1648                 $body = Markdown::toBBCode($msg_text);
1649                 $message_uri = $msg_author.":".$msg_guid;
1650
1651                 $person = FContact::getByURL($msg_author);
1652
1653                 return Mail::insert([
1654                         'uid'        => $importer['uid'],
1655                         'guid'       => $msg_guid,
1656                         'convid'     => $conversation['id'],
1657                         'from-name'  => $person['name'],
1658                         'from-photo' => $person['photo'],
1659                         'from-url'   => $person['url'],
1660                         'contact-id' => $contact['id'],
1661                         'title'      => $subject,
1662                         'body'       => $body,
1663                         'uri'        => $message_uri,
1664                         'parent-uri' => $author . ':' . $guid,
1665                         'created'    => $msg_created_at
1666                 ]);
1667         }
1668
1669         /**
1670          * Processes new private messages (answers to private messages are processed elsewhere)
1671          *
1672          * @param array  $importer Array of the importer user
1673          * @param array  $msg      Array of the processed message, author handle and key
1674          * @param object $data     The message object
1675          *
1676          * @return bool Success
1677          * @throws \Exception
1678          */
1679         private static function receiveConversation(array $importer, $msg, $data)
1680         {
1681                 $author = Strings::escapeTags(XML::unescape($data->author));
1682                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1683                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1684                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1685                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1686
1687                 $messages = $data->message;
1688
1689                 if (!count($messages)) {
1690                         Logger::log("empty conversation");
1691                         return false;
1692                 }
1693
1694                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1695                 if (!$contact) {
1696                         return false;
1697                 }
1698
1699                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1700                 if (!DBA::isResult($conversation)) {
1701                         $r = q(
1702                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1703                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1704                                 intval($importer["uid"]),
1705                                 DBA::escape($guid),
1706                                 DBA::escape($author),
1707                                 DBA::escape($created_at),
1708                                 DBA::escape(DateTimeFormat::utcNow()),
1709                                 DBA::escape($subject),
1710                                 DBA::escape($participants)
1711                         );
1712                         if ($r) {
1713                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1714                         }
1715                 }
1716                 if (!$conversation) {
1717                         Logger::log("unable to create conversation.");
1718                         return false;
1719                 }
1720
1721                 foreach ($messages as $mesg) {
1722                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1723                 }
1724
1725                 return true;
1726         }
1727
1728         /**
1729          * Processes "like" messages
1730          *
1731          * @param array  $importer Array of the importer user
1732          * @param string $sender   The sender of the message
1733          * @param object $data     The message object
1734          *
1735          * @return int The message id of the generated like or "false" if there was an error
1736          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1737          * @throws \ImagickException
1738          */
1739         private static function receiveLike(array $importer, $sender, $data)
1740         {
1741                 $author = Strings::escapeTags(XML::unescape($data->author));
1742                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1743                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1744                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
1745                 $positive = Strings::escapeTags(XML::unescape($data->positive));
1746
1747                 // likes on comments aren't supported by Diaspora - only on posts
1748                 // But maybe this will be supported in the future, so we will accept it.
1749                 if (!in_array($parent_type, ["Post", "Comment"])) {
1750                         return false;
1751                 }
1752
1753                 $contact = self::allowedContactByHandle($importer, $sender, true);
1754                 if (!$contact) {
1755                         return false;
1756                 }
1757
1758                 $message_id = self::messageExists($importer["uid"], $guid);
1759                 if ($message_id) {
1760                         return true;
1761                 }
1762
1763                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1764                 if (!$toplevel_parent_item) {
1765                         return false;
1766                 }
1767
1768                 $person = FContact::getByURL($author);
1769                 if (!is_array($person)) {
1770                         Logger::log("unable to find author details");
1771                         return false;
1772                 }
1773
1774                 // Fetch the contact id - if we know this contact
1775                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1776
1777                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1778                 // We would accept this anyhow.
1779                 if ($positive == "true") {
1780                         $verb = Activity::LIKE;
1781                 } else {
1782                         $verb = Activity::DISLIKE;
1783                 }
1784
1785                 $datarray = [];
1786
1787                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1788
1789                 $datarray["uid"] = $importer["uid"];
1790                 $datarray["contact-id"] = $author_contact["cid"];
1791                 $datarray["network"]  = $author_contact["network"];
1792
1793                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1794                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1795
1796                 $datarray["guid"] = $guid;
1797                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1798
1799                 $datarray["verb"] = $verb;
1800                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1801                 $datarray['thr-parent'] = $toplevel_parent_item['uri'];
1802
1803                 $datarray["object-type"] = Activity\ObjectType::NOTE;
1804
1805                 $datarray["body"] = $verb;
1806
1807                 // Diaspora doesn't provide a date for likes
1808                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1809
1810                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
1811                 if ($toplevel_parent_item['gravity'] != GRAVITY_PARENT) {
1812                         $toplevel = Item::selectFirst(['origin'], ['id' => $toplevel_parent_item['parent']]);
1813                         $origin = $toplevel["origin"];
1814                 } else {
1815                         $origin = $toplevel_parent_item["origin"];
1816                 }
1817
1818                 // If we are the origin of the parent we store the original data.
1819                 // We notify our followers during the item storage.
1820                 if ($origin) {
1821                         $datarray['diaspora_signed_text'] = json_encode($data);
1822                 }
1823
1824                 $message_id = Item::insert($datarray);
1825
1826                 if ($message_id <= 0) {
1827                         return false;
1828                 }
1829
1830                 if ($message_id) {
1831                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1832                         if ($datarray['uid'] == 0) {
1833                                 Item::distribute($message_id, json_encode($data));
1834                         }
1835                 }
1836
1837                 return true;
1838         }
1839
1840         /**
1841          * Processes private messages
1842          *
1843          * @param array  $importer Array of the importer user
1844          * @param object $data     The message object
1845          *
1846          * @return bool Success?
1847          * @throws \Exception
1848          */
1849         private static function receiveMessage(array $importer, $data)
1850         {
1851                 $author = Strings::escapeTags(XML::unescape($data->author));
1852                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1853                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
1854                 $text = XML::unescape($data->text);
1855                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1856
1857                 $contact = self::allowedContactByHandle($importer, $author, true);
1858                 if (!$contact) {
1859                         return false;
1860                 }
1861
1862                 $conversation = null;
1863
1864                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
1865                 $conversation = DBA::selectFirst('conv', [], $condition);
1866
1867                 if (!DBA::isResult($conversation)) {
1868                         Logger::log("conversation not available.");
1869                         return false;
1870                 }
1871
1872                 $message_uri = $author.":".$guid;
1873
1874                 $person = FContact::getByURL($author);
1875                 if (!$person) {
1876                         Logger::log("unable to find author details");
1877                         return false;
1878                 }
1879
1880                 $body = Markdown::toBBCode($text);
1881
1882                 $body = self::replacePeopleGuid($body, $person["url"]);
1883
1884                 return Mail::insert([
1885                         'uid'        => $importer['uid'],
1886                         'guid'       => $guid,
1887                         'convid'     => $conversation['id'],
1888                         'from-name'  => $person['name'],
1889                         'from-photo' => $person['photo'],
1890                         'from-url'   => $person['url'],
1891                         'contact-id' => $contact['id'],
1892                         'title'      => $conversation['subject'],
1893                         'body'       => $body,
1894                         'reply'      => 1,
1895                         'uri'        => $message_uri,
1896                         'parent-uri' => $author.":".$conversation['guid'],
1897                         'created'    => $created_at
1898                 ]);
1899         }
1900
1901         /**
1902          * Processes participations - unsupported by now
1903          *
1904          * @param array  $importer Array of the importer user
1905          * @param object $data     The message object
1906          *
1907          * @return bool success
1908          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1909          * @throws \ImagickException
1910          */
1911         private static function receiveParticipation(array $importer, $data)
1912         {
1913                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
1914                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1915                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1916
1917                 $contact = self::allowedContactByHandle($importer, $author, true);
1918                 if (!$contact) {
1919                         return false;
1920                 }
1921
1922                 if (self::messageExists($importer["uid"], $guid)) {
1923                         return true;
1924                 }
1925
1926                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1927                 if (!$toplevel_parent_item) {
1928                         return false;
1929                 }
1930
1931                 if (!$toplevel_parent_item['origin']) {
1932                         Logger::info('Not our origin. Participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
1933                 }
1934
1935                 if (!in_array($toplevel_parent_item['private'], [Item::PUBLIC, Item::UNLISTED])) {
1936                         Logger::info('Item is not public, participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
1937                         return false;
1938                 }
1939
1940                 $person = FContact::getByURL($author);
1941                 if (!is_array($person)) {
1942                         Logger::log("Person not found: ".$author);
1943                         return false;
1944                 }
1945
1946                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1947
1948                 // Store participation
1949                 $datarray = [];
1950
1951                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1952
1953                 $datarray["uid"] = $importer["uid"];
1954                 $datarray["contact-id"] = $author_contact["cid"];
1955                 $datarray["network"]  = $author_contact["network"];
1956
1957                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1958                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1959
1960                 $datarray["guid"] = $guid;
1961                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1962
1963                 $datarray["verb"] = Activity::FOLLOW;
1964                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1965                 $datarray['thr-parent'] = $toplevel_parent_item['uri'];
1966                 $datarray['parent-uri'] = $toplevel_parent_item['parent-uri'];
1967
1968                 $datarray["object-type"] = Activity\ObjectType::NOTE;
1969
1970                 $datarray["body"] = Activity::FOLLOW;
1971
1972                 // Diaspora doesn't provide a date for a participation
1973                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1974
1975                 $message_id = Item::insert($datarray);
1976
1977                 Logger::info('Participation stored', ['id' => $message_id, 'guid' => $guid, 'parent_guid' => $parent_guid, 'author' => $author]);
1978
1979                 // Send all existing comments and likes to the requesting server
1980                 $comments = Item::select(['id', 'uri-id', 'parent-author-network', 'author-network', 'verb'],
1981                         ['parent' => $toplevel_parent_item['id'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
1982                 while ($comment = Item::fetch($comments)) {
1983                         if (in_array($comment['verb'], [Activity::FOLLOW, Activity::TAG])) {
1984                                 Logger::info('participation messages are not relayed', ['item' => $comment['id']]);
1985                                 continue;
1986                         }
1987
1988                         if ($comment['author-network'] == Protocol::ACTIVITYPUB) {
1989                                 Logger::info('Comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
1990                                 continue;
1991                         }
1992
1993                         if ($comment['parent-author-network'] == Protocol::ACTIVITYPUB) {
1994                                 Logger::info('Comments to comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
1995                                 continue;
1996                         }
1997
1998                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $author_contact["cid"]]);
1999                         if (Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $author_contact["cid"])) {
2000                                 Post\DeliveryData::incrementQueueCount($comment['uri-id'], 1);
2001                         }
2002                 }
2003                 DBA::close($comments);
2004
2005                 return true;
2006         }
2007
2008         /**
2009          * Processes photos - unneeded
2010          *
2011          * @param array  $importer Array of the importer user
2012          * @param object $data     The message object
2013          *
2014          * @return bool always true
2015          */
2016         private static function receivePhoto(array $importer, $data)
2017         {
2018                 // There doesn't seem to be a reason for this function,
2019                 // since the photo data is transmitted in the status message as well
2020                 return true;
2021         }
2022
2023         /**
2024          * Processes poll participations - unssupported
2025          *
2026          * @param array  $importer Array of the importer user
2027          * @param object $data     The message object
2028          *
2029          * @return bool always true
2030          */
2031         private static function receivePollParticipation(array $importer, $data)
2032         {
2033                 // We don't support polls by now
2034                 return true;
2035         }
2036
2037         /**
2038          * Processes incoming profile updates
2039          *
2040          * @param array  $importer Array of the importer user
2041          * @param object $data     The message object
2042          *
2043          * @return bool Success
2044          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2045          * @throws \ImagickException
2046          */
2047         private static function receiveProfile(array $importer, $data)
2048         {
2049                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2050
2051                 $contact = self::contactByHandle($importer["uid"], $author);
2052                 if (!$contact) {
2053                         return false;
2054                 }
2055
2056                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2057                 $image_url = XML::unescape($data->image_url);
2058                 $birthday = XML::unescape($data->birthday);
2059                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2060                 $location = Markdown::toBBCode(XML::unescape($data->location));
2061                 $searchable = (XML::unescape($data->searchable) == "true");
2062                 $nsfw = (XML::unescape($data->nsfw) == "true");
2063                 $tags = XML::unescape($data->tag_string);
2064
2065                 $tags = explode("#", $tags);
2066
2067                 $keywords = [];
2068                 foreach ($tags as $tag) {
2069                         $tag = trim(strtolower($tag));
2070                         if ($tag != "") {
2071                                 $keywords[] = $tag;
2072                         }
2073                 }
2074
2075                 $keywords = implode(", ", $keywords);
2076
2077                 $handle_parts = explode("@", $author);
2078                 $nick = $handle_parts[0];
2079
2080                 if ($name === "") {
2081                         $name = $handle_parts[0];
2082                 }
2083
2084                 if (preg_match("|^https?://|", $image_url) === 0) {
2085                         $image_url = "http://".$handle_parts[1].$image_url;
2086                 }
2087
2088                 Contact::updateAvatar($contact["id"], $image_url);
2089
2090                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2091
2092                 $birthday = str_replace("1000", "1901", $birthday);
2093
2094                 if ($birthday != "") {
2095                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2096                 }
2097
2098                 // this is to prevent multiple birthday notifications in a single year
2099                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2100
2101                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2102                         $birthday = $contact["bd"];
2103                 }
2104
2105                 $fields = ['name' => $name, 'location' => $location,
2106                         'name-date' => DateTimeFormat::utcNow(), 'about' => $about,
2107                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2108                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2109
2110                 if (!empty($birthday)) {
2111                         $fields['bd'] = $birthday;
2112                 }
2113
2114                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2115
2116                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2117
2118                 return true;
2119         }
2120
2121         /**
2122          * Processes incoming friend requests
2123          *
2124          * @param array $importer Array of the importer user
2125          * @param array $contact  The contact that send the request
2126          * @return void
2127          * @throws \Exception
2128          */
2129         private static function receiveRequestMakeFriend(array $importer, array $contact)
2130         {
2131                 if ($contact["rel"] == Contact::SHARING) {
2132                         DBA::update(
2133                                 'contact',
2134                                 ['rel' => Contact::FRIEND, 'writable' => true],
2135                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2136                         );
2137                 }
2138         }
2139
2140         /**
2141          * Processes incoming sharing notification
2142          *
2143          * @param array  $importer Array of the importer user
2144          * @param object $data     The message object
2145          *
2146          * @return bool Success
2147          * @throws \Exception
2148          */
2149         private static function receiveContactRequest(array $importer, $data)
2150         {
2151                 $author = XML::unescape($data->author);
2152                 $recipient = XML::unescape($data->recipient);
2153
2154                 if (!$author || !$recipient) {
2155                         return false;
2156                 }
2157
2158                 // the current protocol version doesn't know these fields
2159                 // That means that we will assume their existance
2160                 if (isset($data->following)) {
2161                         $following = (XML::unescape($data->following) == "true");
2162                 } else {
2163                         $following = true;
2164                 }
2165
2166                 if (isset($data->sharing)) {
2167                         $sharing = (XML::unescape($data->sharing) == "true");
2168                 } else {
2169                         $sharing = true;
2170                 }
2171
2172                 $contact = self::contactByHandle($importer["uid"], $author);
2173
2174                 // perhaps we were already sharing with this person. Now they're sharing with us.
2175                 // That makes us friends.
2176                 if ($contact) {
2177                         if ($following) {
2178                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2179                                 self::receiveRequestMakeFriend($importer, $contact);
2180
2181                                 // refetch the contact array
2182                                 $contact = self::contactByHandle($importer["uid"], $author);
2183
2184                                 // If we are now friends, we are sending a share message.
2185                                 // Normally we needn't to do so, but the first message could have been vanished.
2186                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2187                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2188                                         if (DBA::isResult($user)) {
2189                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2190                                                 self::sendShare($user, $contact);
2191                                         }
2192                                 }
2193                                 return true;
2194                         } else {
2195                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2196                                 Contact::removeFollower($importer, $contact);
2197                                 return true;
2198                         }
2199                 }
2200
2201                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2202                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2203                         return false;
2204                 } elseif (!$following && !$sharing) {
2205                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2206                         return false;
2207                 } elseif (!$following && $sharing) {
2208                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2209                 } elseif ($following && $sharing) {
2210                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2211                 } elseif ($following && !$sharing) {
2212                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2213                 }
2214
2215                 $ret = FContact::getByURL($author);
2216
2217                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2218                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2219                         return false;
2220                 }
2221
2222                 $cid = Contact::getIdForURL($ret['url'], $importer['uid']);
2223                 if (!empty($cid)) {
2224                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
2225                 } else {
2226                         $contact = [];
2227                 }
2228
2229                 $item = ['author-id' => Contact::getIdForURL($ret['url']),
2230                         'author-link' => $ret['url']];
2231
2232                 $result = Contact::addRelationship($importer, $contact, $item, false);
2233                 if ($result === true) {
2234                         $contact_record = self::contactByHandle($importer['uid'], $author);
2235                         if (!$contact_record) {
2236                                 Logger::info('unable to locate newly created contact record.');
2237                                 return;
2238                         }
2239
2240                         $user = DBA::selectFirst('user', [], ['uid' => $importer['uid']]);
2241                         if (DBA::isResult($user)) {
2242                                 self::sendShare($user, $contact_record);
2243
2244                                 // Send the profile data, maybe it weren't transmitted before
2245                                 self::sendProfile($importer['uid'], [$contact_record]);
2246                         }
2247                 }
2248
2249                 return true;
2250         }
2251
2252         /**
2253          * Fetches a message with a given guid
2254          *
2255          * @param string $guid        message guid
2256          * @param string $orig_author handle of the original post
2257          * @return array The fetched item
2258          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2259          * @throws \ImagickException
2260          */
2261         public static function originalItem($guid, $orig_author)
2262         {
2263                 if (empty($guid)) {
2264                         Logger::log('Empty guid. Quitting.');
2265                         return false;
2266                 }
2267
2268                 // Do we already have this item?
2269                 $fields = ['body', 'title', 'app', 'created', 'object-type', 'uri', 'guid',
2270                         'author-name', 'author-link', 'author-avatar', 'plink', 'uri-id'];
2271                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2272                 $item = Item::selectFirst($fields, $condition);
2273
2274                 if (DBA::isResult($item)) {
2275                         Logger::log("reshared message ".$guid." already exists on system.");
2276
2277                         // Maybe it is already a reshared item?
2278                         // Then refetch the content, if it is a reshare from a reshare.
2279                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2280                         if (self::isReshare($item["body"], true)) {
2281                                 $item = [];
2282                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2283                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2284
2285                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2286
2287                                 // Add OEmbed and other information to the body
2288                                 $item["body"] = PageInfo::searchAndAppendToBody($item["body"], false, true);
2289
2290                                 return $item;
2291                         } else {
2292                                 return $item;
2293                         }
2294                 }
2295
2296                 if (!DBA::isResult($item)) {
2297                         if (empty($orig_author)) {
2298                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2299                                 return false;
2300                         }
2301
2302                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2303                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2304                         $stored = self::storeByGuid($guid, $server);
2305
2306                         if (!$stored) {
2307                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2308                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2309                                 $stored = self::storeByGuid($guid, $server);
2310                         }
2311
2312                         if ($stored) {
2313                                 $fields = ['body', 'title', 'app', 'created', 'object-type', 'uri', 'guid',
2314                                         'author-name', 'author-link', 'author-avatar', 'plink', 'uri-id'];
2315                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2316                                 $item = Item::selectFirst($fields, $condition);
2317
2318                                 if (DBA::isResult($item)) {
2319                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2320                                         if (self::isReshare($item["body"], false)) {
2321                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2322                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2323                                         }
2324
2325                                         return $item;
2326                                 }
2327                         }
2328                 }
2329                 return false;
2330         }
2331
2332         /**
2333          * Stores a reshare activity
2334          *
2335          * @param array   $item              Array of reshare post
2336          * @param integer $parent_message_id Id of the parent post
2337          * @param string  $guid              GUID string of reshare action
2338          * @param string  $author            Author handle
2339          */
2340         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2341         {
2342                 $parent = Item::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2343
2344                 $datarray = [];
2345
2346                 $datarray['uid'] = $item['uid'];
2347                 $datarray['contact-id'] = $item['contact-id'];
2348                 $datarray['network'] = $item['network'];
2349
2350                 $datarray['author-link'] = $item['author-link'];
2351                 $datarray['author-id'] = $item['author-id'];
2352
2353                 $datarray['owner-link'] = $datarray['author-link'];
2354                 $datarray['owner-id'] = $datarray['author-id'];
2355
2356                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2357                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2358                 $datarray['thr-parent'] = $parent['uri'];
2359                 $datarray['parent-uri'] = $parent['parent-uri'];
2360
2361                 $datarray['verb'] = $datarray['body'] = Activity::ANNOUNCE;
2362                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2363                 $datarray['object-type'] = Activity\ObjectType::NOTE;
2364
2365                 $datarray['protocol'] = $item['protocol'];
2366
2367                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2368                 $datarray['private'] = $item['private'];
2369                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2370
2371                 $message_id = Item::insert($datarray);
2372
2373                 if ($message_id) {
2374                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2375                         if ($datarray['uid'] == 0) {
2376                                 Item::distribute($message_id);
2377                         }
2378                 }
2379         }
2380
2381         /**
2382          * Processes a reshare message
2383          *
2384          * @param array  $importer Array of the importer user
2385          * @param object $data     The message object
2386          * @param string $xml      The original XML of the message
2387          *
2388          * @return int the message id
2389          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2390          * @throws \ImagickException
2391          */
2392         private static function receiveReshare(array $importer, $data, $xml)
2393         {
2394                 $author = Strings::escapeTags(XML::unescape($data->author));
2395                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2396                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2397                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2398                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2399                 /// @todo handle unprocessed property "provider_display_name"
2400                 $public = Strings::escapeTags(XML::unescape($data->public));
2401
2402                 $contact = self::allowedContactByHandle($importer, $author, false);
2403                 if (!$contact) {
2404                         return false;
2405                 }
2406
2407                 $message_id = self::messageExists($importer["uid"], $guid);
2408                 if ($message_id) {
2409                         return true;
2410                 }
2411
2412                 $original_item = self::originalItem($root_guid, $root_author);
2413                 if (!$original_item) {
2414                         return false;
2415                 }
2416
2417                 $datarray = [];
2418
2419                 $datarray["uid"] = $importer["uid"];
2420                 $datarray["contact-id"] = $contact["id"];
2421                 $datarray["network"]  = Protocol::DIASPORA;
2422
2423                 $datarray["author-link"] = $contact["url"];
2424                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2425
2426                 $datarray["owner-link"] = $datarray["author-link"];
2427                 $datarray["owner-id"] = $datarray["author-id"];
2428
2429                 $datarray["guid"] = $guid;
2430                 $datarray["uri"] = $datarray["thr-parent"] = self::getUriFromGuid($author, $guid);
2431                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2432
2433                 $datarray["verb"] = Activity::POST;
2434                 $datarray["gravity"] = GRAVITY_PARENT;
2435
2436                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2437                 $datarray["source"] = $xml;
2438
2439                 /// @todo Copy tag data from original post
2440
2441                 $prefix = BBCode::getShareOpeningTag(
2442                         $original_item["author-name"],
2443                         $original_item["author-link"],
2444                         $original_item["author-avatar"],
2445                         $original_item["plink"],
2446                         $original_item["created"],
2447                         $original_item["guid"]
2448                 );
2449
2450                 if (!empty($original_item['title'])) {
2451                         $prefix .= '[h3]' . $original_item['title'] . "[/h3]\n";
2452                 }
2453
2454                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2455
2456                 Tag::storeFromBody($datarray['uri-id'], $datarray["body"]);
2457
2458                 Post\Media::copy($original_item['uri-id'], $datarray['uri-id']);
2459                 $datarray["app"]  = $original_item["app"];
2460
2461                 $datarray["plink"] = self::plink($author, $guid);
2462                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2463                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2464
2465                 $datarray["object-type"] = $original_item["object-type"];
2466
2467                 self::fetchGuid($datarray);
2468                 $message_id = Item::insert($datarray);
2469
2470                 self::sendParticipation($contact, $datarray);
2471
2472                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2473                 if ($root_message_id) {
2474                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2475                 }
2476
2477                 if ($message_id) {
2478                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2479                         if ($datarray['uid'] == 0) {
2480                                 Item::distribute($message_id);
2481                         }
2482                         return true;
2483                 } else {
2484                         return false;
2485                 }
2486         }
2487
2488         /**
2489          * Processes retractions
2490          *
2491          * @param array  $importer Array of the importer user
2492          * @param array  $contact  The contact of the item owner
2493          * @param object $data     The message object
2494          *
2495          * @return bool success
2496          * @throws \Exception
2497          */
2498         private static function itemRetraction(array $importer, array $contact, $data)
2499         {
2500                 $author = Strings::escapeTags(XML::unescape($data->author));
2501                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2502                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2503
2504                 $person = FContact::getByURL($author);
2505                 if (!is_array($person)) {
2506                         Logger::log("unable to find author detail for ".$author);
2507                         return false;
2508                 }
2509
2510                 if (empty($contact["url"])) {
2511                         $contact["url"] = $person["url"];
2512                 }
2513
2514                 // Fetch items that are about to be deleted
2515                 $fields = ['uid', 'id', 'parent', 'author-link', 'file'];
2516
2517                 // When we receive a public retraction, we delete every item that we find.
2518                 if ($importer['uid'] == 0) {
2519                         $condition = ['guid' => $target_guid, 'deleted' => false];
2520                 } else {
2521                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2522                 }
2523
2524                 $r = Item::select($fields, $condition);
2525                 if (!DBA::isResult($r)) {
2526                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2527                         return false;
2528                 }
2529
2530                 while ($item = Item::fetch($r)) {
2531                         if (strstr($item['file'], '[')) {
2532                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2533                                 continue;
2534                         }
2535
2536                         // Fetch the parent item
2537                         $parent = Item::selectFirst(['author-link'], ['id' => $item['parent']]);
2538
2539                         // Only delete it if the parent author really fits
2540                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2541                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2542                                 continue;
2543                         }
2544
2545                         Item::markForDeletion(['id' => $item['id']]);
2546
2547                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item['parent'], Logger::DEBUG);
2548                 }
2549
2550                 return true;
2551         }
2552
2553         /**
2554          * Receives retraction messages
2555          *
2556          * @param array  $importer Array of the importer user
2557          * @param string $sender   The sender of the message
2558          * @param object $data     The message object
2559          *
2560          * @return bool Success
2561          * @throws \Exception
2562          */
2563         private static function receiveRetraction(array $importer, $sender, $data)
2564         {
2565                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2566
2567                 $contact = self::contactByHandle($importer["uid"], $sender);
2568                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2569                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2570                         return false;
2571                 }
2572
2573                 if (!$contact) {
2574                         $contact = [];
2575                 }
2576
2577                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2578
2579                 switch ($target_type) {
2580                         case "Comment":
2581                         case "Like":
2582                         case "Post":
2583                         case "Reshare":
2584                         case "StatusMessage":
2585                                 return self::itemRetraction($importer, $contact, $data);
2586
2587                         case "PollParticipation":
2588                         case "Photo":
2589                                 // Currently unsupported
2590                                 break;
2591
2592                         default:
2593                                 Logger::log("Unknown target type ".$target_type);
2594                                 return false;
2595                 }
2596                 return true;
2597         }
2598
2599         /**
2600          * Checks if an incoming message is wanted
2601          *
2602          * @param string $url
2603          * @param integer $uriid
2604          * @param string $author
2605          * @param string $body
2606          * @return boolean Is the message wanted?
2607          */
2608         private static function isSolicitedMessage(string $url, int $uriid, string $author, string $body)
2609         {
2610                 $contact = Contact::getByURL($author);
2611                 if (DBA::exists('contact', ["`nurl` = ? AND `uid` != ? AND `rel` IN (?, ?)",
2612                         $contact['nurl'], 0, Contact::FRIEND, Contact::SHARING])) {
2613                         Logger::info('Author has got followers - accepted', ['url' => $url, 'author' => $author]);
2614                         return true;
2615                 }
2616
2617                 $taglist = Tag::getByURIId($uriid, [Tag::HASHTAG]);
2618                 $tags = array_column($taglist, 'name');
2619                 return Relay::isSolicitedPost($tags, $body, $contact['id'], $url, Protocol::DIASPORA);
2620         }
2621
2622         /**
2623          * Store an attached photo in the post-media table
2624          *
2625          * @param int $uriid
2626          * @param object $photo
2627          * @return void
2628          */
2629         private static function storePhotoAsMedia(int $uriid, $photo)
2630         {
2631                 $data = [];
2632                 $data['uri-id'] = $uriid;
2633                 $data['type'] = Post\Media::IMAGE;
2634                 $data['url'] = XML::unescape($photo->remote_photo_path) . XML::unescape($photo->remote_photo_name);
2635                 $data['height'] = (int)XML::unescape($photo->height ?? 0);
2636                 $data['width'] = (int)XML::unescape($photo->width ?? 0);
2637                 $data['description'] = XML::unescape($photo->text ?? '');
2638
2639                 Post\Media::insert($data);
2640         }
2641
2642         /**
2643          * Receives status messages
2644          *
2645          * @param array            $importer Array of the importer user
2646          * @param SimpleXMLElement $data     The message object
2647          * @param string           $xml      The original XML of the message
2648          * @param bool             $fetched  The message had been fetched and not pushed
2649          * @return int The message id of the newly created item
2650          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2651          * @throws \ImagickException
2652          */
2653         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml, bool $fetched)
2654         {
2655                 $author = Strings::escapeTags(XML::unescape($data->author));
2656                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2657                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2658                 $public = Strings::escapeTags(XML::unescape($data->public));
2659                 $text = XML::unescape($data->text);
2660                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2661
2662                 $contact = self::allowedContactByHandle($importer, $author, false);
2663                 if (!$contact) {
2664                         return false;
2665                 }
2666
2667                 $message_id = self::messageExists($importer["uid"], $guid);
2668                 if ($message_id) {
2669                         return true;
2670                 }
2671
2672                 $address = [];
2673                 if ($data->location) {
2674                         foreach ($data->location->children() as $fieldname => $data) {
2675                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2676                         }
2677                 }
2678
2679                 $raw_body = $body = Markdown::toBBCode($text);
2680
2681                 $datarray = [];
2682
2683                 $datarray["guid"] = $guid;
2684                 $datarray["uri"] = $datarray["thr-parent"] = self::getUriFromGuid($author, $guid);
2685                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2686
2687                 // Attach embedded pictures to the body
2688                 if ($data->photo) {
2689                         foreach ($data->photo as $photo) {
2690                                 self::storePhotoAsMedia($datarray['uri-id'], $photo);
2691                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2692                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2693                         }
2694
2695                         $datarray["object-type"] = Activity\ObjectType::IMAGE;
2696                 } else {
2697                         $datarray["object-type"] = Activity\ObjectType::NOTE;
2698
2699                         // Add OEmbed and other information to the body
2700                         if (!self::isHubzilla($contact["url"])) {
2701                                 $body = PageInfo::searchAndAppendToBody($body, false, true);
2702                         }
2703                 }
2704
2705                 /// @todo enable support for polls
2706                 //if ($data->poll) {
2707                 //      foreach ($data->poll AS $poll)
2708                 //              print_r($poll);
2709                 //      die("poll!\n");
2710                 //}
2711
2712                 /// @todo enable support for events
2713
2714                 $datarray["uid"] = $importer["uid"];
2715                 $datarray["contact-id"] = $contact["id"];
2716                 $datarray["network"] = Protocol::DIASPORA;
2717
2718                 $datarray["author-link"] = $contact["url"];
2719                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2720
2721                 $datarray["owner-link"] = $datarray["author-link"];
2722                 $datarray["owner-id"] = $datarray["author-id"];
2723
2724                 $datarray["verb"] = Activity::POST;
2725                 $datarray["gravity"] = GRAVITY_PARENT;
2726
2727                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2728                 $datarray["source"] = $xml;
2729
2730                 if ($fetched) {
2731                         $datarray["post-type"] = Item::PT_FETCHED;
2732                 } elseif ($datarray["uid"] == 0) {
2733                         $datarray["post-type"] = Item::PT_GLOBAL;
2734                 }
2735
2736                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2737                 $datarray["raw-body"] = self::replacePeopleGuid($raw_body, $contact["url"]);
2738
2739                 self::storeMentions($datarray['uri-id'], $text);
2740                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
2741
2742                 if (!$fetched && !self::isSolicitedMessage($datarray["uri"], $datarray['uri-id'], $author, $body)) {
2743                         DBA::delete('item-uri', ['uri' => $datarray['uri']]);
2744                         return false;
2745                 }
2746
2747                 if ($provider_display_name != "") {
2748                         $datarray["app"] = $provider_display_name;
2749                 }
2750
2751                 $datarray["plink"] = self::plink($author, $guid);
2752                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2753                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2754
2755                 if (isset($address["address"])) {
2756                         $datarray["location"] = $address["address"];
2757                 }
2758
2759                 if (isset($address["lat"]) && isset($address["lng"])) {
2760                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2761                 }
2762
2763                 self::fetchGuid($datarray);
2764                 $message_id = Item::insert($datarray);
2765
2766                 self::sendParticipation($contact, $datarray);
2767
2768                 if ($message_id) {
2769                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2770                         if ($datarray['uid'] == 0) {
2771                                 Item::distribute($message_id);
2772                         }
2773                         return true;
2774                 } else {
2775                         return false;
2776                 }
2777         }
2778
2779         /* ************************************************************************************** *
2780          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2781          * ************************************************************************************** */
2782
2783         /**
2784          * returnes the handle of a contact
2785          *
2786          * @param array $contact contact array
2787          *
2788          * @return string the handle in the format user@domain.tld
2789          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2790          */
2791         private static function myHandle(array $contact)
2792         {
2793                 if (!empty($contact["addr"])) {
2794                         return $contact["addr"];
2795                 }
2796
2797                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2798                 // So - just in case - we build the the address here.
2799                 if ($contact["nickname"] != "") {
2800                         $nick = $contact["nickname"];
2801                 } else {
2802                         $nick = $contact["nick"];
2803                 }
2804
2805                 return $nick . "@" . substr(DI::baseUrl(), strpos(DI::baseUrl(), "://") + 3);
2806         }
2807
2808
2809         /**
2810          * Creates the data for a private message in the new format
2811          *
2812          * @param string $msg     The message that is to be transmitted
2813          * @param array  $user    The record of the sender
2814          * @param array  $contact Target of the communication
2815          * @param string $prvkey  The private key of the sender
2816          * @param string $pubkey  The public key of the receiver
2817          *
2818          * @return string The encrypted data
2819          * @throws \Exception
2820          */
2821         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2822         {
2823                 Logger::log("Message: ".$msg, Logger::DATA);
2824
2825                 // without a public key nothing will work
2826                 if (!$pubkey) {
2827                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
2828                         return false;
2829                 }
2830
2831                 $aes_key = openssl_random_pseudo_bytes(32);
2832                 $b_aes_key = base64_encode($aes_key);
2833                 $iv = openssl_random_pseudo_bytes(16);
2834                 $b_iv = base64_encode($iv);
2835
2836                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
2837
2838                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
2839
2840                 $encrypted_key_bundle = "";
2841                 if (!@openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey)) {
2842                         return false;
2843                 }
2844
2845                 $json_object = json_encode(
2846                         ["aes_key" => base64_encode($encrypted_key_bundle),
2847                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
2848                 );
2849
2850                 return $json_object;
2851         }
2852
2853         /**
2854          * Creates the envelope for the "fetch" endpoint and for the new format
2855          *
2856          * @param string $msg  The message that is to be transmitted
2857          * @param array  $user The record of the sender
2858          *
2859          * @return string The envelope
2860          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2861          */
2862         public static function buildMagicEnvelope($msg, array $user)
2863         {
2864                 $b64url_data = Strings::base64UrlEncode($msg);
2865                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
2866
2867                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
2868                 $type = "application/xml";
2869                 $encoding = "base64url";
2870                 $alg = "RSA-SHA256";
2871                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
2872
2873                 // Fallback if the private key wasn't transmitted in the expected field
2874                 if ($user['uprvkey'] == "") {
2875                         $user['uprvkey'] = $user['prvkey'];
2876                 }
2877
2878                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
2879                 $sig = Strings::base64UrlEncode($signature);
2880
2881                 $xmldata = ["me:env" => ["me:data" => $data,
2882                                                         "@attributes" => ["type" => $type],
2883                                                         "me:encoding" => $encoding,
2884                                                         "me:alg" => $alg,
2885                                                         "me:sig" => $sig,
2886                                                         "@attributes2" => ["key_id" => $key_id]]];
2887
2888                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
2889
2890                 return XML::fromArray($xmldata, $xml, false, $namespaces);
2891         }
2892
2893         /**
2894          * Create the envelope for a message
2895          *
2896          * @param string $msg     The message that is to be transmitted
2897          * @param array  $user    The record of the sender
2898          * @param array  $contact Target of the communication
2899          * @param string $prvkey  The private key of the sender
2900          * @param string $pubkey  The public key of the receiver
2901          * @param bool   $public  Is the message public?
2902          *
2903          * @return string The message that will be transmitted to other servers
2904          * @throws \Exception
2905          */
2906         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
2907         {
2908                 // The message is put into an envelope with the sender's signature
2909                 $envelope = self::buildMagicEnvelope($msg, $user);
2910
2911                 // Private messages are put into a second envelope, encrypted with the receivers public key
2912                 if (!$public) {
2913                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
2914                 }
2915
2916                 return $envelope;
2917         }
2918
2919         /**
2920          * Creates a signature for a message
2921          *
2922          * @param array $owner   the array of the owner of the message
2923          * @param array $message The message that is to be signed
2924          *
2925          * @return string The signature
2926          */
2927         private static function signature($owner, $message)
2928         {
2929                 $sigmsg = $message;
2930                 unset($sigmsg["author_signature"]);
2931                 unset($sigmsg["parent_author_signature"]);
2932
2933                 $signed_text = implode(";", $sigmsg);
2934
2935                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
2936         }
2937
2938         /**
2939          * Transmit a message to a target server
2940          *
2941          * @param array  $owner        the array of the item owner
2942          * @param array  $contact      Target of the communication
2943          * @param string $envelope     The message that is to be transmitted
2944          * @param bool   $public_batch Is it a public post?
2945          * @param string $guid         message guid
2946          *
2947          * @return int Result of the transmission
2948          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2949          * @throws \ImagickException
2950          */
2951         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
2952         {
2953                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
2954                 if (!$enabled) {
2955                         return 200;
2956                 }
2957
2958                 $logid = Strings::getRandomHex(4);
2959
2960                 // We always try to use the data from the fcontact table.
2961                 // This is important for transmitting data to Friendica servers.
2962                 if (!empty($contact['addr'])) {
2963                         $fcontact = FContact::getByURL($contact['addr']);
2964                         if (!empty($fcontact)) {
2965                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
2966                         }
2967                 }
2968
2969                 if (empty($dest_url)) {
2970                         $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
2971                 }
2972
2973                 if (!$dest_url) {
2974                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2975                         return 0;
2976                 }
2977
2978                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
2979
2980                 if (!intval(DI::config()->get("system", "diaspora_test"))) {
2981                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
2982
2983                         $postResult = DI::httpRequest()->post($dest_url . "/", $envelope, ["Content-Type: " . $content_type]);
2984                         $return_code = $postResult->getReturnCode();
2985                 } else {
2986                         Logger::log("test_mode");
2987                         return 200;
2988                 }
2989
2990                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
2991
2992                 return $return_code ? $return_code : -1;
2993         }
2994
2995
2996         /**
2997          * Build the post xml
2998          *
2999          * @param string $type    The message type
3000          * @param array  $message The message data
3001          *
3002          * @return string The post XML
3003          */
3004         public static function buildPostXml($type, $message)
3005         {
3006                 $data = [$type => $message];
3007
3008                 return XML::fromArray($data, $xml);
3009         }
3010
3011         /**
3012          * Builds and transmit messages
3013          *
3014          * @param array  $owner        the array of the item owner
3015          * @param array  $contact      Target of the communication
3016          * @param string $type         The message type
3017          * @param array  $message      The message data
3018          * @param bool   $public_batch Is it a public post?
3019          * @param string $guid         message guid
3020          *
3021          * @return int Result of the transmission
3022          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3023          * @throws \ImagickException
3024          */
3025         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "")
3026         {
3027                 $msg = self::buildPostXml($type, $message);
3028
3029                 Logger::log('message: '.$msg, Logger::DATA);
3030                 Logger::log('send guid '.$guid, Logger::DEBUG);
3031
3032                 // Fallback if the private key wasn't transmitted in the expected field
3033                 if (empty($owner['uprvkey'])) {
3034                         $owner['uprvkey'] = $owner['prvkey'];
3035                 }
3036
3037                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3038
3039                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3040
3041                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3042
3043                 return $return_code;
3044         }
3045
3046         /**
3047          * sends a participation (Used to get all further updates)
3048          *
3049          * @param array $contact Target of the communication
3050          * @param array $item    Item array
3051          *
3052          * @return int The result of the transmission
3053          * @throws \Exception
3054          */
3055         private static function sendParticipation(array $contact, array $item)
3056         {
3057                 // Don't send notifications for private postings
3058                 if ($item['private'] == Item::PRIVATE) {
3059                         return;
3060                 }
3061
3062                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3063
3064                 $result = DI::cache()->get($cachekey);
3065                 if (!is_null($result)) {
3066                         return;
3067                 }
3068
3069                 // Fetch some user id to have a valid handle to transmit the participation.
3070                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3071                 // If the item belongs to a user, we take this user id.
3072                 if ($item['uid'] == 0) {
3073                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3074                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3075                         $owner = User::getOwnerDataById($first_user['uid']);
3076                 } else {
3077                         $owner = User::getOwnerDataById($item['uid']);
3078                 }
3079
3080                 $author = self::myHandle($owner);
3081
3082                 $message = ["author" => $author,
3083                                 "guid" => System::createUUID(),
3084                                 "parent_type" => "Post",
3085                                 "parent_guid" => $item["guid"]];
3086
3087                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3088
3089                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3090                 DI::cache()->set($cachekey, $item["guid"], Duration::QUARTER_HOUR);
3091
3092                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3093         }
3094
3095         /**
3096          * sends an account migration
3097          *
3098          * @param array $owner   the array of the item owner
3099          * @param array $contact Target of the communication
3100          * @param int   $uid     User ID
3101          *
3102          * @return int The result of the transmission
3103          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3104          * @throws \ImagickException
3105          */
3106         public static function sendAccountMigration(array $owner, array $contact, $uid)
3107         {
3108                 $old_handle = DI::pConfig()->get($uid, 'system', 'previous_addr');
3109                 $profile = self::createProfileData($uid);
3110
3111                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3112                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3113
3114                 $message = ["author" => $old_handle,
3115                                 "profile" => $profile,
3116                                 "signature" => $signature];
3117
3118                 Logger::info('Send account migration', ['msg' => $message]);
3119
3120                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3121         }
3122
3123         /**
3124          * Sends a "share" message
3125          *
3126          * @param array $owner   the array of the item owner
3127          * @param array $contact Target of the communication
3128          *
3129          * @return int The result of the transmission
3130          * @throws \Exception
3131          */
3132         public static function sendShare(array $owner, array $contact)
3133         {
3134                 /**
3135                  * @todo support the different possible combinations of "following" and "sharing"
3136                  * Currently, Diaspora only interprets the "sharing" field
3137                  *
3138                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3139                  */
3140
3141                 /*
3142                 switch ($contact["rel"]) {
3143                         case Contact::FRIEND:
3144                                 $following = true;
3145                                 $sharing = true;
3146
3147                         case Contact::SHARING:
3148                                 $following = false;
3149                                 $sharing = true;
3150
3151                         case Contact::FOLLOWER:
3152                                 $following = true;
3153                                 $sharing = false;
3154                 }
3155                 */
3156
3157                 $message = ["author" => self::myHandle($owner),
3158                                 "recipient" => $contact["addr"],
3159                                 "following" => "true",
3160                                 "sharing" => "true"];
3161
3162                 Logger::info('Send share', ['msg' => $message]);
3163
3164                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3165         }
3166
3167         /**
3168          * sends an "unshare"
3169          *
3170          * @param array $owner   the array of the item owner
3171          * @param array $contact Target of the communication
3172          *
3173          * @return int The result of the transmission
3174          * @throws \Exception
3175          */
3176         public static function sendUnshare(array $owner, array $contact)
3177         {
3178                 $message = ["author" => self::myHandle($owner),
3179                                 "recipient" => $contact["addr"],
3180                                 "following" => "false",
3181                                 "sharing" => "false"];
3182
3183                 Logger::info('Send unshare', ['msg' => $message]);
3184
3185                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3186         }
3187
3188         /**
3189          * Checks a message body if it is a reshare
3190          *
3191          * @param string $body     The message body that is to be check
3192          * @param bool   $complete Should it be a complete check or a simple check?
3193          *
3194          * @return array|bool Reshare details or "false" if no reshare
3195          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3196          * @throws \ImagickException
3197          */
3198         public static function isReshare($body, $complete = true)
3199         {
3200                 $body = trim($body);
3201
3202                 $reshared = Item::getShareArray(['body' => $body]);
3203                 if (empty($reshared)) {
3204                         return false;
3205                 }
3206
3207                 // Skip if it isn't a pure repeated messages
3208                 // Does it start with a share?
3209                 if (!empty($reshared['comment']) && $complete) {
3210                         return false;
3211                 }
3212
3213                 if (!empty($reshared['guid']) && $complete) {
3214                         $condition = ['guid' => $reshared['guid'], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3215                         $item = Item::selectFirst(['contact-id'], $condition);
3216                         if (DBA::isResult($item)) {
3217                                 $ret = [];
3218                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3219                                 $ret["root_guid"] = $reshared['guid'];
3220                                 return $ret;
3221                         } elseif ($complete) {
3222                                 // We are resharing something that isn't a DFRN or Diaspora post.
3223                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3224                                 return false;
3225                         }
3226                 } elseif (empty($reshared['guid']) && $complete) {
3227                         return false;
3228                 }
3229
3230                 $ret = [];
3231
3232                 if (!empty($reshared['profile']) && ($cid = Contact::getIdForURL($reshared['profile']))) {
3233                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $cid]);
3234                         if (!empty($contact['addr'])) {
3235                                 $ret['root_handle'] = $contact['addr'];
3236                         }
3237                 }
3238
3239                 if (empty($ret) && !$complete) {
3240                         return true;
3241                 }
3242
3243                 return $ret;
3244         }
3245
3246         /**
3247          * Create an event array
3248          *
3249          * @param integer $event_id The id of the event
3250          *
3251          * @return array with event data
3252          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3253          */
3254         private static function buildEvent($event_id)
3255         {
3256                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3257                 if (!DBA::isResult($r)) {
3258                         return [];
3259                 }
3260
3261                 $event = $r[0];
3262
3263                 $eventdata = [];
3264
3265                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3266                 if (!DBA::isResult($r)) {
3267                         return [];
3268                 }
3269
3270                 $user = $r[0];
3271
3272                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3273                 if (!DBA::isResult($r)) {
3274                         return [];
3275                 }
3276
3277                 $owner = $r[0];
3278
3279                 $eventdata['author'] = self::myHandle($owner);
3280
3281                 if ($event['guid']) {
3282                         $eventdata['guid'] = $event['guid'];
3283                 }
3284
3285                 $mask = DateTimeFormat::ATOM;
3286
3287                 /// @todo - establish "all day" events in Friendica
3288                 $eventdata["all_day"] = "false";
3289
3290                 $eventdata['timezone'] = 'UTC';
3291                 if (!$event['adjust'] && $user['timezone']) {
3292                         $eventdata['timezone'] = $user['timezone'];
3293                 }
3294
3295                 if ($event['start']) {
3296                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3297                 }
3298                 if ($event['finish'] && !$event['nofinish']) {
3299                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3300                 }
3301                 if ($event['summary']) {
3302                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3303                 }
3304                 if ($event['desc']) {
3305                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3306                 }
3307                 if ($event['location']) {
3308                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3309                         $coord = Map::getCoordinates($event['location']);
3310
3311                         $location = [];
3312                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3313                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3314                                 $location["lat"] = $coord['lat'];
3315                                 $location["lng"] = $coord['lon'];
3316                         } else {
3317                                 $location["lat"] = 0;
3318                                 $location["lng"] = 0;
3319                         }
3320                         $eventdata['location'] = $location;
3321                 }
3322
3323                 return $eventdata;
3324         }
3325
3326         /**
3327          * Create a post (status message or reshare)
3328          *
3329          * @param array $item  The item that will be exported
3330          * @param array $owner the array of the item owner
3331          *
3332          * @return array
3333          * 'type' -> Message type ("status_message" or "reshare")
3334          * 'message' -> Array of XML elements of the status
3335          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3336          * @throws \ImagickException
3337          */
3338         public static function buildStatus(array $item, array $owner)
3339         {
3340                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3341
3342                 $result = DI::cache()->get($cachekey);
3343                 if (!is_null($result)) {
3344                         return $result;
3345                 }
3346
3347                 $myaddr = self::myHandle($owner);
3348
3349                 $public = ($item["private"] == Item::PRIVATE ? "false" : "true");
3350                 $created = DateTimeFormat::utc($item['received'], DateTimeFormat::ATOM);
3351                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3352
3353                 // Detect a share element and do a reshare
3354                 if (($item['private'] != Item::PRIVATE) && ($ret = self::isReshare($item["body"]))) {
3355                         $message = ["author" => $myaddr,
3356                                         "guid" => $item["guid"],
3357                                         "created_at" => $created,
3358                                         "root_author" => $ret["root_handle"],
3359                                         "root_guid" => $ret["root_guid"],
3360                                         "provider_display_name" => $item["app"],
3361                                         "public" => $public];
3362
3363                         $type = "reshare";
3364                 } else {
3365                         $title = $item["title"];
3366                         $body = $item["body"];
3367
3368                         // Fetch the title from an attached link - if there is one
3369                         if (empty($item["title"]) && DI::pConfig()->get($owner['uid'], 'system', 'attach_link_title')) {
3370                                 $page_data = BBCode::getAttachmentData($item['body']);
3371                                 if (!empty($page_data['type']) && !empty($page_data['title']) && ($page_data['type'] == 'link')) {
3372                                         $title = $page_data['title'];
3373                                 }
3374                         }
3375
3376                         if ($item['author-link'] != $item['owner-link']) {
3377                                 require_once 'mod/share.php';
3378                                 $body = BBCode::getShareOpeningTag($item['author-name'], $item['author-link'], $item['author-avatar'],
3379                                         $item['plink'], $item['created']) . $body . '[/share]';
3380                         }
3381
3382                         // convert to markdown
3383                         $body = html_entity_decode(BBCode::toMarkdown($body));
3384
3385                         // Adding the title
3386                         if (strlen($title)) {
3387                                 $body = "### ".html_entity_decode($title)."\n\n".$body;
3388                         }
3389
3390                         $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]);
3391                         if (!empty($attachments)) {
3392                                 $body .= "\n".DI::l10n()->t("Attachments:")."\n";
3393                                 foreach ($attachments as $attachment) {
3394                                         $body .= "[" . $attachment['description'] . "](" . $attachment['url'] . ")\n";
3395                                 }
3396                         }
3397
3398                         $location = [];
3399
3400                         if ($item["location"] != "")
3401                                 $location["address"] = $item["location"];
3402
3403                         if ($item["coord"] != "") {
3404                                 $coord = explode(" ", $item["coord"]);
3405                                 $location["lat"] = $coord[0];
3406                                 $location["lng"] = $coord[1];
3407                         }
3408
3409                         $message = ["author" => $myaddr,
3410                                         "guid" => $item["guid"],
3411                                         "created_at" => $created,
3412                                         "edited_at" => $edited,
3413                                         "public" => $public,
3414                                         "text" => $body,
3415                                         "provider_display_name" => $item["app"],
3416                                         "location" => $location];
3417
3418                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3419                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3420                                 unset($message["location"]);
3421                         }
3422
3423                         if ($item['event-id'] > 0) {
3424                                 $event = self::buildEvent($item['event-id']);
3425                                 if (count($event)) {
3426                                         $message['event'] = $event;
3427
3428                                         if (!empty($event['location']['address']) &&
3429                                                 !empty($event['location']['lat']) &&
3430                                                 !empty($event['location']['lng'])) {
3431                                                 $message['location'] = $event['location'];
3432                                         }
3433
3434                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3435                                         // $message['text'] = '';
3436                                 }
3437                         }
3438
3439                         $type = "status_message";
3440                 }
3441
3442                 $msg = ["type" => $type, "message" => $message];
3443
3444                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
3445
3446                 return $msg;
3447         }
3448
3449         private static function prependParentAuthorMention($body, $profile_url)
3450         {
3451                 $profile = Contact::getByURL($profile_url, false, ['addr', 'name', 'contact-type']);
3452                 if (!empty($profile['addr'])
3453                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3454                         && !strstr($body, $profile['addr'])
3455                         && !strstr($body, $profile_url)
3456                 ) {
3457                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3458                 }
3459
3460                 return $body;
3461         }
3462
3463         /**
3464          * Sends a post
3465          *
3466          * @param array $item         The item that will be exported
3467          * @param array $owner        the array of the item owner
3468          * @param array $contact      Target of the communication
3469          * @param bool  $public_batch Is it a public post?
3470          *
3471          * @return int The result of the transmission
3472          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3473          * @throws \ImagickException
3474          */
3475         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3476         {
3477                 $status = self::buildStatus($item, $owner);
3478
3479                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3480         }
3481
3482         /**
3483          * Creates a "like" object
3484          *
3485          * @param array $item  The item that will be exported
3486          * @param array $owner the array of the item owner
3487          *
3488          * @return array The data for a "like"
3489          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3490          */
3491         private static function constructLike(array $item, array $owner)
3492         {
3493                 $parent = Item::selectFirst(['guid', 'uri', 'thr-parent'], ['uri' => $item["thr-parent"]]);
3494                 if (!DBA::isResult($parent)) {
3495                         return false;
3496                 }
3497
3498                 $target_type = ($parent["uri"] === $parent["thr-parent"] ? "Post" : "Comment");
3499                 $positive = null;
3500                 if ($item['verb'] === Activity::LIKE) {
3501                         $positive = "true";
3502                 } elseif ($item['verb'] === Activity::DISLIKE) {
3503                         $positive = "false";
3504                 }
3505
3506                 return(["author" => self::myHandle($owner),
3507                                 "guid" => $item["guid"],
3508                                 "parent_guid" => $parent["guid"],
3509                                 "parent_type" => $target_type,
3510                                 "positive" => $positive,
3511                                 "author_signature" => ""]);
3512         }
3513
3514         /**
3515          * Creates an "EventParticipation" object
3516          *
3517          * @param array $item  The item that will be exported
3518          * @param array $owner the array of the item owner
3519          *
3520          * @return array The data for an "EventParticipation"
3521          * @throws \Exception
3522          */
3523         private static function constructAttend(array $item, array $owner)
3524         {
3525                 $parent = Item::selectFirst(['guid'], ['uri' => $item['thr-parent']]);
3526                 if (!DBA::isResult($parent)) {
3527                         return false;
3528                 }
3529
3530                 switch ($item['verb']) {
3531                         case Activity::ATTEND:
3532                                 $attend_answer = 'accepted';
3533                                 break;
3534                         case Activity::ATTENDNO:
3535                                 $attend_answer = 'declined';
3536                                 break;
3537                         case Activity::ATTENDMAYBE:
3538                                 $attend_answer = 'tentative';
3539                                 break;
3540                         default:
3541                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3542                                 return false;
3543                 }
3544
3545                 return(["author" => self::myHandle($owner),
3546                                 "guid" => $item["guid"],
3547                                 "parent_guid" => $parent["guid"],
3548                                 "status" => $attend_answer,
3549                                 "author_signature" => ""]);
3550         }
3551
3552         /**
3553          * Creates the object for a comment
3554          *
3555          * @param array $item  The item that will be exported
3556          * @param array $owner the array of the item owner
3557          *
3558          * @return array|false The data for a comment
3559          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3560          */
3561         private static function constructComment(array $item, array $owner)
3562         {
3563                 $cachekey = "diaspora:constructComment:".$item['guid'];
3564
3565                 $result = DI::cache()->get($cachekey);
3566                 if (!is_null($result)) {
3567                         return $result;
3568                 }
3569
3570                 $toplevel_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['id' => $item['parent'], 'parent' => $item['parent']]);
3571                 if (!DBA::isResult($toplevel_item)) {
3572                         Logger::error('Missing parent conversation item', ['parent' => $item['parent']]);
3573                         return false;
3574                 }
3575
3576                 $thread_parent_item = $toplevel_item;
3577                 if ($item['thr-parent'] != $item['parent-uri']) {
3578                         $thread_parent_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3579                 }
3580
3581                 $body = $item["body"];
3582
3583                 // The replied to autor mention is prepended for clarity if:
3584                 // - Item replied isn't yours
3585                 // - Item is public or explicit mentions are disabled
3586                 // - Implicit mentions are enabled
3587                 if (
3588                         $item['author-id'] != $thread_parent_item['author-id']
3589                         && (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3590                         && !DI::config()->get('system', 'disable_implicit_mentions')
3591                 ) {
3592                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3593                 }
3594
3595                 $text = html_entity_decode(BBCode::toMarkdown($body));
3596                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3597                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3598
3599                 $comment = [
3600                         "author"      => self::myHandle($owner),
3601                         "guid"        => $item["guid"],
3602                         "created_at"  => $created,
3603                         "edited_at"   => $edited,
3604                         "parent_guid" => $toplevel_item["guid"],
3605                         "text"        => $text,
3606                         "author_signature" => ""
3607                 ];
3608
3609                 // Send the thread parent guid only if it is a threaded comment
3610                 if ($item['thr-parent'] != $item['parent-uri']) {
3611                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3612                 }
3613
3614                 DI::cache()->set($cachekey, $comment, Duration::QUARTER_HOUR);
3615
3616                 return($comment);
3617         }
3618
3619         /**
3620          * Send a like or a comment
3621          *
3622          * @param array $item         The item that will be exported
3623          * @param array $owner        the array of the item owner
3624          * @param array $contact      Target of the communication
3625          * @param bool  $public_batch Is it a public post?
3626          *
3627          * @return int The result of the transmission
3628          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3629          * @throws \ImagickException
3630          */
3631         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3632         {
3633                 if (in_array($item['verb'], [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE])) {
3634                         $message = self::constructAttend($item, $owner);
3635                         $type = "event_participation";
3636                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3637                         $message = self::constructLike($item, $owner);
3638                         $type = "like";
3639                 } elseif (!in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
3640                         $message = self::constructComment($item, $owner);
3641                         $type = "comment";
3642                 }
3643
3644                 if (empty($message)) {
3645                         return false;
3646                 }
3647
3648                 $message["author_signature"] = self::signature($owner, $message);
3649
3650                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3651         }
3652
3653         /**
3654          * Creates a message from a signature record entry
3655          *
3656          * @param array $item The item that will be exported
3657          * @return array The message
3658          */
3659         private static function messageFromSignature(array $item)
3660         {
3661                 // Split the signed text
3662                 $signed_parts = explode(";", $item['signed_text']);
3663
3664                 if ($item["deleted"]) {
3665                         $message = ["author" => $item['signer'],
3666                                         "target_guid" => $signed_parts[0],
3667                                         "target_type" => $signed_parts[1]];
3668                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3669                         $message = ["author" => $signed_parts[4],
3670                                         "guid" => $signed_parts[1],
3671                                         "parent_guid" => $signed_parts[3],
3672                                         "parent_type" => $signed_parts[2],
3673                                         "positive" => $signed_parts[0],
3674                                         "author_signature" => $item['signature'],
3675                                         "parent_author_signature" => ""];
3676                 } else {
3677                         // Remove the comment guid
3678                         $guid = array_shift($signed_parts);
3679
3680                         // Remove the parent guid
3681                         $parent_guid = array_shift($signed_parts);
3682
3683                         // Remove the handle
3684                         $handle = array_pop($signed_parts);
3685
3686                         $message = [
3687                                 "author" => $handle,
3688                                 "guid" => $guid,
3689                                 "parent_guid" => $parent_guid,
3690                                 "text" => implode(";", $signed_parts),
3691                                 "author_signature" => $item['signature'],
3692                                 "parent_author_signature" => ""
3693                         ];
3694                 }
3695                 return $message;
3696         }
3697
3698         /**
3699          * Relays messages (like, comment, retraction) to other servers if we are the thread owner
3700          *
3701          * @param array $item         The item that will be exported
3702          * @param array $owner        the array of the item owner
3703          * @param array $contact      Target of the communication
3704          * @param bool  $public_batch Is it a public post?
3705          *
3706          * @return int The result of the transmission
3707          * @throws \Exception
3708          */
3709         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3710         {
3711                 if ($item["deleted"]) {
3712                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3713                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3714                         $type = "like";
3715                 } else {
3716                         $type = "comment";
3717                 }
3718
3719                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3720
3721                 $msg = json_decode($item['signed_text'], true);
3722
3723                 $message = [];
3724                 if (is_array($msg)) {
3725                         foreach ($msg as $field => $data) {
3726                                 if (!$item["deleted"]) {
3727                                         if ($field == "diaspora_handle") {
3728                                                 $field = "author";
3729                                         }
3730                                         if ($field == "target_type") {
3731                                                 $field = "parent_type";
3732                                         }
3733                                 }
3734
3735                                 $message[$field] = $data;
3736                         }
3737                 } else {
3738                         Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3739                 }
3740
3741                 $message["parent_author_signature"] = self::signature($owner, $message);
3742
3743                 Logger::info('Relayed data', ['msg' => $message]);
3744
3745                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3746         }
3747
3748         /**
3749          * Sends a retraction (deletion) of a message, like or comment
3750          *
3751          * @param array $item         The item that will be exported
3752          * @param array $owner        the array of the item owner
3753          * @param array $contact      Target of the communication
3754          * @param bool  $public_batch Is it a public post?
3755          * @param bool  $relay        Is the retraction transmitted from a relay?
3756          *
3757          * @return int The result of the transmission
3758          * @throws \Exception
3759          */
3760         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3761         {
3762                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3763
3764                 $msg_type = "retraction";
3765
3766                 if ($item['gravity'] == GRAVITY_PARENT) {
3767                         $target_type = "Post";
3768                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3769                         $target_type = "Like";
3770                 } else {
3771                         $target_type = "Comment";
3772                 }
3773
3774                 $message = ["author" => $itemaddr,
3775                                 "target_guid" => $item['guid'],
3776                                 "target_type" => $target_type];
3777
3778                 Logger::info('Got message', ['msg' => $message]);
3779
3780                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3781         }
3782
3783         /**
3784          * Sends a mail
3785          *
3786          * @param array $item    The item that will be exported
3787          * @param array $owner   The owner
3788          * @param array $contact Target of the communication
3789          *
3790          * @return int The result of the transmission
3791          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3792          * @throws \ImagickException
3793          */
3794         public static function sendMail(array $item, array $owner, array $contact)
3795         {
3796                 $myaddr = self::myHandle($owner);
3797
3798                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
3799                 if (!DBA::isResult($cnv)) {
3800                         Logger::log("conversation not found.");
3801                         return;
3802                 }
3803
3804                 $body = BBCode::toMarkdown($item["body"]);
3805                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3806
3807                 $msg = [
3808                         "author" => $myaddr,
3809                         "guid" => $item["guid"],
3810                         "conversation_guid" => $cnv["guid"],
3811                         "text" => $body,
3812                         "created_at" => $created,
3813                 ];
3814
3815                 if ($item["reply"]) {
3816                         $message = $msg;
3817                         $type = "message";
3818                 } else {
3819                         $message = [
3820                                 "author" => $cnv["creator"],
3821                                 "guid" => $cnv["guid"],
3822                                 "subject" => $cnv["subject"],
3823                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
3824                                 "participants" => $cnv["recips"],
3825                                 "message" => $msg
3826                         ];
3827
3828                         $type = "conversation";
3829                 }
3830
3831                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
3832         }
3833
3834         /**
3835          * Split a name into first name and last name
3836          *
3837          * @param string $name The name
3838          *
3839          * @return array The array with "first" and "last"
3840          */
3841         public static function splitName($name) {
3842                 $name = trim($name);
3843
3844                 // Is the name longer than 64 characters? Then cut the rest of it.
3845                 if (strlen($name) > 64) {
3846                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
3847                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
3848                         } else {
3849                                 $name = substr($name, 0, 64);
3850                         }
3851                 }
3852
3853                 // Take the first word as first name
3854                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
3855                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3856                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3857                         return ['first' => $first, 'last' => $last];
3858                 }
3859
3860                 // Take the last word as last name
3861                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
3862                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3863
3864                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3865                         return ['first' => $first, 'last' => $last];
3866                 }
3867
3868                 // Take the first 32 characters if there is no space in the first 32 characters
3869                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
3870                         $first = substr($name, 0, 32);
3871                         $last = substr($name, 32);
3872                         return ['first' => $first, 'last' => $last];
3873                 }
3874
3875                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
3876                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3877
3878                 // Check if the last name is longer than 32 characters
3879                 if (strlen($last) > 32) {
3880                         if (strpos($last, ' ') <= 32) {
3881                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
3882                         } else {
3883                                 $last = substr($last, 0, 32);
3884                         }
3885                 }
3886
3887                 return ['first' => $first, 'last' => $last];
3888         }
3889
3890         /**
3891          * Create profile data
3892          *
3893          * @param int $uid The user id
3894          *
3895          * @return array The profile data
3896          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3897          */
3898         private static function createProfileData($uid)
3899         {
3900                 $profile = DBA::selectFirst('owner-view', ['uid', 'addr', 'name', 'location', 'net-publish', 'dob', 'about', 'pub_keywords'], ['uid' => $uid]);
3901                 if (!DBA::isResult($profile)) {
3902                         return [];
3903                 }
3904
3905                 $handle = $profile["addr"];
3906
3907                 $split_name = self::splitName($profile['name']);
3908                 $first = $split_name['first'];
3909                 $last = $split_name['last'];
3910
3911                 $large = DI::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3912                 $medium = DI::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3913                 $small = DI::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3914                 $searchable = ($profile['net-publish'] ? 'true' : 'false');
3915
3916                 $dob = null;
3917                 $about = null;
3918                 $location = null;
3919                 $tags = null;
3920                 if ($searchable === 'true') {
3921                         $dob = '';
3922
3923                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
3924                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
3925                                 if ($year < 1004) {
3926                                         $year = 1004;
3927                                 }
3928                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
3929                         }
3930
3931                         $about = BBCode::toMarkdown($profile['about']);
3932
3933                         $location = $profile['location'];
3934                         $tags = '';
3935                         if ($profile['pub_keywords']) {
3936                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
3937                                 $kw = str_replace('  ', ' ', $kw);
3938                                 $arr = explode(' ', $kw);
3939                                 if (count($arr)) {
3940                                         for ($x = 0; $x < 5; $x ++) {
3941                                                 if (!empty($arr[$x])) {
3942                                                         $tags .= '#'. trim($arr[$x]) .' ';
3943                                                 }
3944                                         }
3945                                 }
3946                         }
3947                         $tags = trim($tags);
3948                 }
3949
3950                 return ["author" => $handle,
3951                                 "first_name" => $first,
3952                                 "last_name" => $last,
3953                                 "image_url" => $large,
3954                                 "image_url_medium" => $medium,
3955                                 "image_url_small" => $small,
3956                                 "birthday" => $dob,
3957                                 "bio" => $about,
3958                                 "location" => $location,
3959                                 "searchable" => $searchable,
3960                                 "nsfw" => "false",
3961                                 "tag_string" => $tags];
3962         }
3963
3964         /**
3965          * Sends profile data
3966          *
3967          * @param int  $uid    The user id
3968          * @param bool $recips optional, default false
3969          * @return void
3970          * @throws \Exception
3971          */
3972         public static function sendProfile($uid, $recips = false)
3973         {
3974                 if (!$uid) {
3975                         return;
3976                 }
3977
3978                 $owner = User::getOwnerDataById($uid);
3979                 if (!$owner) {
3980                         return;
3981                 }
3982
3983                 if (!$recips) {
3984                         $recips = q(
3985                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3986                                 AND `uid` = %d AND `rel` != %d",
3987                                 DBA::escape(Protocol::DIASPORA),
3988                                 intval($uid),
3989                                 intval(Contact::SHARING)
3990                         );
3991                 }
3992
3993                 if (!$recips) {
3994                         return;
3995                 }
3996
3997                 $message = self::createProfileData($uid);
3998
3999                 // @ToDo Split this into single worker jobs
4000                 foreach ($recips as $recip) {
4001                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4002                         self::buildAndTransmit($owner, $recip, "profile", $message);
4003                 }
4004         }
4005
4006         /**
4007          * Creates the signature for likes that are created on our system
4008          *
4009          * @param integer $uid  The user of that comment
4010          * @param array   $item Item array
4011          *
4012          * @return array Signed content
4013          * @throws \Exception
4014          */
4015         public static function createLikeSignature($uid, array $item)
4016         {
4017                 $owner = User::getOwnerDataById($uid);
4018                 if (empty($owner)) {
4019                         Logger::info('No owner post, so not storing signature');
4020                         return false;
4021                 }
4022
4023                 if (!in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4024                         return false;
4025                 }
4026
4027                 $message = self::constructLike($item, $owner);
4028                 if ($message === false) {
4029                         return false;
4030                 }
4031
4032                 $message["author_signature"] = self::signature($owner, $message);
4033
4034                 return $message;
4035         }
4036
4037         /**
4038          * Creates the signature for Comments that are created on our system
4039          *
4040          * @param integer $uid  The user of that comment
4041          * @param array   $item Item array
4042          *
4043          * @return array Signed content
4044          * @throws \Exception
4045          */
4046         public static function createCommentSignature($uid, array $item)
4047         {
4048                 $owner = User::getOwnerDataById($uid);
4049                 if (empty($owner)) {
4050                         Logger::info('No owner post, so not storing signature');
4051                         return false;
4052                 }
4053
4054                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['thr-parent']]);
4055                 if (!DBA::isResult($parent)) {
4056                         return;
4057                 }
4058
4059                 $item['parent-uri'] = $parent['parent-uri'];
4060
4061                 $message = self::constructComment($item, $owner);
4062                 if ($message === false) {
4063                         return false;
4064                 }
4065
4066                 $message["author_signature"] = self::signature($owner, $message);
4067
4068                 return $message;
4069         }
4070 }