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 = Post::select(['author-id', 'author-link', 'parent-author-link', 'parent-guid', 'guid'],
  80                         ['parent' => $item['parent'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
  81                 while ($item = Post::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, $fetched);
 541
 542                         case "message":
 543                                 if (!$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, $fetched);
 555
 556                         case "photo": // Not implemented
 557                                 return self::receivePhoto($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"], $fetched);
 571
 572                         case "retraction":
 573                                 return self::receiveRetraction($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 = Post::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 = Post::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 = Post::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                 $item = Post::selectFirst($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                                 $item = Post::selectFirst($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(string $addr, string $guid, string $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 = Post::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          * Store the mentions in the tag table
1431          *
1432          * @param integer $uriid
1433          * @param string $text
1434          */
1435         private static function storeMentions(int $uriid, string $text)
1436         {
1437                 preg_match_all('/([@!]){(?:([^}]+?); ?)?([^} ]+)}/', $text, $matches, PREG_SET_ORDER);
1438                 if (empty($matches)) {
1439                         return;
1440                 }
1441
1442                 /*
1443                  * Matching values for the preg match
1444                  * [1] = mention type (@ or !)
1445                  * [2] = name (optional)
1446                  * [3] = profile URL
1447                  */
1448
1449                 foreach ($matches as $match) {
1450                         if (empty($match)) {
1451                                 continue;
1452                         }
1453
1454                         $person = FContact::getByURL($match[3]);
1455                         if (empty($person)) {
1456                                 continue;
1457                         }
1458
1459                         Tag::storeByHash($uriid, $match[1], $person['name'] ?: $person['nick'], $person['url']);
1460                 }
1461         }
1462
1463         /**
1464          * Processes an incoming comment
1465          *
1466          * @param array  $importer Array of the importer user
1467          * @param string $sender   The sender of the message
1468          * @param object $data     The message object
1469          * @param string $xml      The original XML of the message
1470          * @param bool   $fetched  The message had been fetched and not pushed
1471          *
1472          * @return int The message id of the generated comment or "false" if there was an error
1473          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1474          * @throws \ImagickException
1475          */
1476         private static function receiveComment(array $importer, $sender, $data, $xml, bool $fetched)
1477         {
1478                 $author = Strings::escapeTags(XML::unescape($data->author));
1479                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1480                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1481                 $text = XML::unescape($data->text);
1482
1483                 if (isset($data->created_at)) {
1484                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1485                 } else {
1486                         $created_at = DateTimeFormat::utcNow();
1487                 }
1488
1489                 if (isset($data->thread_parent_guid)) {
1490                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1491                         $thr_parent = self::getUriFromGuid("", $thread_parent_guid, true);
1492                 } else {
1493                         $thr_parent = "";
1494                 }
1495
1496                 $contact = self::allowedContactByHandle($importer, $sender, true);
1497                 if (!$contact) {
1498                         return false;
1499                 }
1500
1501                 $message_id = self::messageExists($importer["uid"], $guid);
1502                 if ($message_id) {
1503                         return true;
1504                 }
1505
1506                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1507                 if (!$toplevel_parent_item) {
1508                         return false;
1509                 }
1510
1511                 $person = FContact::getByURL($author);
1512                 if (!is_array($person)) {
1513                         Logger::log("unable to find author details");
1514                         return false;
1515                 }
1516
1517                 // Fetch the contact id - if we know this contact
1518                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1519
1520                 $datarray = [];
1521
1522                 $datarray["uid"] = $importer["uid"];
1523                 $datarray["contact-id"] = $author_contact["cid"];
1524                 $datarray["network"]  = $author_contact["network"];
1525
1526                 $datarray["author-link"] = $person["url"];
1527                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1528
1529                 $datarray["owner-link"] = $contact["url"];
1530                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1531
1532                 // Will be overwritten for sharing accounts in Item::insert
1533                 if ($fetched) {
1534                         $datarray["post-type"] = Item::PT_FETCHED;
1535                 } elseif ($datarray["uid"] == 0) {
1536                         $datarray["post-type"] = Item::PT_GLOBAL;
1537                 } else {
1538                         $datarray["post-type"] = Item::PT_COMMENT;
1539                 }
1540
1541                 $datarray["guid"] = $guid;
1542                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1543                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
1544
1545                 $datarray["verb"] = Activity::POST;
1546                 $datarray["gravity"] = GRAVITY_COMMENT;
1547
1548                 $datarray['thr-parent'] = $thr_parent ?: $toplevel_parent_item['uri'];
1549
1550                 $datarray["object-type"] = Activity\ObjectType::COMMENT;
1551
1552                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1553                 $datarray["source"] = $xml;
1554                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
1555
1556                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1557
1558                 $datarray["plink"] = self::plink($author, $guid, $toplevel_parent_item['guid']);
1559                 $body = Markdown::toBBCode($text);
1560
1561                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1562
1563                 self::storeMentions($datarray['uri-id'], $text);
1564                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
1565
1566                 self::fetchGuid($datarray);
1567
1568                 // If we are the origin of the parent we store the original data.
1569                 // We notify our followers during the item storage.
1570                 if ($toplevel_parent_item["origin"]) {
1571                         $datarray['diaspora_signed_text'] = json_encode($data);
1572                 }
1573
1574                 if (Item::isTooOld($datarray)) {
1575                         Logger::info('Comment is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
1576                         return false;
1577                 }
1578
1579                 $message_id = Item::insert($datarray);
1580
1581                 if ($message_id <= 0) {
1582                         return false;
1583                 }
1584
1585                 if ($message_id) {
1586                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1587                         if ($datarray['uid'] == 0) {
1588                                 Item::distribute($message_id, json_encode($data));
1589                         }
1590                 }
1591
1592                 return true;
1593         }
1594
1595         /**
1596          * processes and stores private messages
1597          *
1598          * @param array  $importer     Array of the importer user
1599          * @param array  $contact      The contact of the message
1600          * @param object $data         The message object
1601          * @param array  $msg          Array of the processed message, author handle and key
1602          * @param object $mesg         The private message
1603          * @param array  $conversation The conversation record to which this message belongs
1604          *
1605          * @return bool "true" if it was successful
1606          * @throws \Exception
1607          */
1608         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1609         {
1610                 $author = Strings::escapeTags(XML::unescape($data->author));
1611                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1612                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1613
1614                 // "diaspora_handle" is the element name from the old version
1615                 // "author" is the element name from the new version
1616                 if ($mesg->author) {
1617                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1618                 } elseif ($mesg->diaspora_handle) {
1619                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1620                 } else {
1621                         return false;
1622                 }
1623
1624                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1625                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1626                 $msg_text = XML::unescape($mesg->text);
1627                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1628
1629                 if ($msg_conversation_guid != $guid) {
1630                         Logger::log("message conversation guid does not belong to the current conversation.");
1631                         return false;
1632                 }
1633
1634                 $body = Markdown::toBBCode($msg_text);
1635                 $message_uri = $msg_author.":".$msg_guid;
1636
1637                 $person = FContact::getByURL($msg_author);
1638
1639                 return Mail::insert([
1640                         'uid'        => $importer['uid'],
1641                         'guid'       => $msg_guid,
1642                         'convid'     => $conversation['id'],
1643                         'from-name'  => $person['name'],
1644                         'from-photo' => $person['photo'],
1645                         'from-url'   => $person['url'],
1646                         'contact-id' => $contact['id'],
1647                         'title'      => $subject,
1648                         'body'       => $body,
1649                         'uri'        => $message_uri,
1650                         'parent-uri' => $author . ':' . $guid,
1651                         'created'    => $msg_created_at
1652                 ]);
1653         }
1654
1655         /**
1656          * Processes new private messages (answers to private messages are processed elsewhere)
1657          *
1658          * @param array  $importer Array of the importer user
1659          * @param array  $msg      Array of the processed message, author handle and key
1660          * @param object $data     The message object
1661          *
1662          * @return bool Success
1663          * @throws \Exception
1664          */
1665         private static function receiveConversation(array $importer, $msg, $data)
1666         {
1667                 $author = Strings::escapeTags(XML::unescape($data->author));
1668                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1669                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1670                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1671                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1672
1673                 $messages = $data->message;
1674
1675                 if (!count($messages)) {
1676                         Logger::log("empty conversation");
1677                         return false;
1678                 }
1679
1680                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1681                 if (!$contact) {
1682                         return false;
1683                 }
1684
1685                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1686                 if (!DBA::isResult($conversation)) {
1687                         $r = q(
1688                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1689                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1690                                 intval($importer["uid"]),
1691                                 DBA::escape($guid),
1692                                 DBA::escape($author),
1693                                 DBA::escape($created_at),
1694                                 DBA::escape(DateTimeFormat::utcNow()),
1695                                 DBA::escape($subject),
1696                                 DBA::escape($participants)
1697                         );
1698                         if ($r) {
1699                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1700                         }
1701                 }
1702                 if (!$conversation) {
1703                         Logger::log("unable to create conversation.");
1704                         return false;
1705                 }
1706
1707                 foreach ($messages as $mesg) {
1708                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1709                 }
1710
1711                 return true;
1712         }
1713
1714         /**
1715          * Processes "like" messages
1716          *
1717          * @param array  $importer Array of the importer user
1718          * @param string $sender   The sender of the message
1719          * @param object $data     The message object
1720          *
1721          * @return int The message id of the generated like or "false" if there was an error
1722          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1723          * @throws \ImagickException
1724          */
1725         private static function receiveLike(array $importer, $sender, $data, bool $fetched)
1726         {
1727                 $author = Strings::escapeTags(XML::unescape($data->author));
1728                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1729                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1730                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
1731                 $positive = Strings::escapeTags(XML::unescape($data->positive));
1732
1733                 // likes on comments aren't supported by Diaspora - only on posts
1734                 // But maybe this will be supported in the future, so we will accept it.
1735                 if (!in_array($parent_type, ["Post", "Comment"])) {
1736                         return false;
1737                 }
1738
1739                 $contact = self::allowedContactByHandle($importer, $sender, true);
1740                 if (!$contact) {
1741                         return false;
1742                 }
1743
1744                 $message_id = self::messageExists($importer["uid"], $guid);
1745                 if ($message_id) {
1746                         return true;
1747                 }
1748
1749                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1750                 if (!$toplevel_parent_item) {
1751                         return false;
1752                 }
1753
1754                 $person = FContact::getByURL($author);
1755                 if (!is_array($person)) {
1756                         Logger::log("unable to find author details");
1757                         return false;
1758                 }
1759
1760                 // Fetch the contact id - if we know this contact
1761                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1762
1763                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1764                 // We would accept this anyhow.
1765                 if ($positive == "true") {
1766                         $verb = Activity::LIKE;
1767                 } else {
1768                         $verb = Activity::DISLIKE;
1769                 }
1770
1771                 $datarray = [];
1772
1773                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1774                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
1775
1776                 $datarray["uid"] = $importer["uid"];
1777                 $datarray["contact-id"] = $author_contact["cid"];
1778                 $datarray["network"]  = $author_contact["network"];
1779
1780                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1781                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1782
1783                 $datarray["guid"] = $guid;
1784                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1785
1786                 $datarray["verb"] = $verb;
1787                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1788                 $datarray['thr-parent'] = $toplevel_parent_item['uri'];
1789
1790                 $datarray["object-type"] = Activity\ObjectType::NOTE;
1791
1792                 $datarray["body"] = $verb;
1793
1794                 // Diaspora doesn't provide a date for likes
1795                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1796
1797                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
1798                 if ($toplevel_parent_item['gravity'] != GRAVITY_PARENT) {
1799                         $toplevel = Post::selectFirst(['origin'], ['id' => $toplevel_parent_item['parent']]);
1800                         $origin = $toplevel["origin"];
1801                 } else {
1802                         $origin = $toplevel_parent_item["origin"];
1803                 }
1804
1805                 // If we are the origin of the parent we store the original data.
1806                 // We notify our followers during the item storage.
1807                 if ($origin) {
1808                         $datarray['diaspora_signed_text'] = json_encode($data);
1809                 }
1810
1811                 if (Item::isTooOld($datarray)) {
1812                         Logger::info('Like is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
1813                         return false;
1814                 }
1815
1816                 $message_id = Item::insert($datarray);
1817
1818                 if ($message_id <= 0) {
1819                         return false;
1820                 }
1821
1822                 if ($message_id) {
1823                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1824                         if ($datarray['uid'] == 0) {
1825                                 Item::distribute($message_id, json_encode($data));
1826                         }
1827                 }
1828
1829                 return true;
1830         }
1831
1832         /**
1833          * Processes private messages
1834          *
1835          * @param array  $importer Array of the importer user
1836          * @param object $data     The message object
1837          *
1838          * @return bool Success?
1839          * @throws \Exception
1840          */
1841         private static function receiveMessage(array $importer, $data)
1842         {
1843                 $author = Strings::escapeTags(XML::unescape($data->author));
1844                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1845                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
1846                 $text = XML::unescape($data->text);
1847                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1848
1849                 $contact = self::allowedContactByHandle($importer, $author, true);
1850                 if (!$contact) {
1851                         return false;
1852                 }
1853
1854                 $conversation = null;
1855
1856                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
1857                 $conversation = DBA::selectFirst('conv', [], $condition);
1858
1859                 if (!DBA::isResult($conversation)) {
1860                         Logger::log("conversation not available.");
1861                         return false;
1862                 }
1863
1864                 $message_uri = $author.":".$guid;
1865
1866                 $person = FContact::getByURL($author);
1867                 if (!$person) {
1868                         Logger::log("unable to find author details");
1869                         return false;
1870                 }
1871
1872                 $body = Markdown::toBBCode($text);
1873
1874                 $body = self::replacePeopleGuid($body, $person["url"]);
1875
1876                 return Mail::insert([
1877                         'uid'        => $importer['uid'],
1878                         'guid'       => $guid,
1879                         'convid'     => $conversation['id'],
1880                         'from-name'  => $person['name'],
1881                         'from-photo' => $person['photo'],
1882                         'from-url'   => $person['url'],
1883                         'contact-id' => $contact['id'],
1884                         'title'      => $conversation['subject'],
1885                         'body'       => $body,
1886                         'reply'      => 1,
1887                         'uri'        => $message_uri,
1888                         'parent-uri' => $author.":".$conversation['guid'],
1889                         'created'    => $created_at
1890                 ]);
1891         }
1892
1893         /**
1894          * Processes participations - unsupported by now
1895          *
1896          * @param array  $importer Array of the importer user
1897          * @param object $data     The message object
1898          *
1899          * @return bool success
1900          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1901          * @throws \ImagickException
1902          */
1903         private static function receiveParticipation(array $importer, $data, bool $fetched)
1904         {
1905                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
1906                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1907                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1908
1909                 $contact = self::allowedContactByHandle($importer, $author, true);
1910                 if (!$contact) {
1911                         return false;
1912                 }
1913
1914                 if (self::messageExists($importer["uid"], $guid)) {
1915                         return true;
1916                 }
1917
1918                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1919                 if (!$toplevel_parent_item) {
1920                         return false;
1921                 }
1922
1923                 if (!$toplevel_parent_item['origin']) {
1924                         Logger::info('Not our origin. Participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
1925                 }
1926
1927                 if (!in_array($toplevel_parent_item['private'], [Item::PUBLIC, Item::UNLISTED])) {
1928                         Logger::info('Item is not public, participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
1929                         return false;
1930                 }
1931
1932                 $person = FContact::getByURL($author);
1933                 if (!is_array($person)) {
1934                         Logger::log("Person not found: ".$author);
1935                         return false;
1936                 }
1937
1938                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1939
1940                 // Store participation
1941                 $datarray = [];
1942
1943                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1944                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
1945
1946                 $datarray["uid"] = $importer["uid"];
1947                 $datarray["contact-id"] = $author_contact["cid"];
1948                 $datarray["network"]  = $author_contact["network"];
1949
1950                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1951                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1952
1953                 $datarray["guid"] = $guid;
1954                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1955
1956                 $datarray["verb"] = Activity::FOLLOW;
1957                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1958                 $datarray['thr-parent'] = $toplevel_parent_item['uri'];
1959
1960                 $datarray["object-type"] = Activity\ObjectType::NOTE;
1961
1962                 $datarray["body"] = Activity::FOLLOW;
1963
1964                 // Diaspora doesn't provide a date for a participation
1965                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1966
1967                 if (Item::isTooOld($datarray)) {
1968                         Logger::info('Participation is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
1969                         return false;
1970                 }
1971
1972                 $message_id = Item::insert($datarray);
1973
1974                 Logger::info('Participation stored', ['id' => $message_id, 'guid' => $guid, 'parent_guid' => $parent_guid, 'author' => $author]);
1975
1976                 // Send all existing comments and likes to the requesting server
1977                 $comments = Post::select(['id', 'uri-id', 'parent-author-network', 'author-network', 'verb'],
1978                         ['parent' => $toplevel_parent_item['id'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
1979                 while ($comment = Post::fetch($comments)) {
1980                         if (in_array($comment['verb'], [Activity::FOLLOW, Activity::TAG])) {
1981                                 Logger::info('participation messages are not relayed', ['item' => $comment['id']]);
1982                                 continue;
1983                         }
1984
1985                         if ($comment['author-network'] == Protocol::ACTIVITYPUB) {
1986                                 Logger::info('Comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
1987                                 continue;
1988                         }
1989
1990                         if ($comment['parent-author-network'] == Protocol::ACTIVITYPUB) {
1991                                 Logger::info('Comments to comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
1992                                 continue;
1993                         }
1994
1995                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $author_contact["cid"]]);
1996                         if (Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $author_contact["cid"])) {
1997                                 Post\DeliveryData::incrementQueueCount($comment['uri-id'], 1);
1998                         }
1999                 }
2000                 DBA::close($comments);
2001
2002                 return true;
2003         }
2004
2005         /**
2006          * Processes photos - unneeded
2007          *
2008          * @param array  $importer Array of the importer user
2009          * @param object $data     The message object
2010          *
2011          * @return bool always true
2012          */
2013         private static function receivePhoto(array $importer, $data)
2014         {
2015                 // There doesn't seem to be a reason for this function,
2016                 // since the photo data is transmitted in the status message as well
2017                 return true;
2018         }
2019
2020         /**
2021          * Processes poll participations - unssupported
2022          *
2023          * @param array  $importer Array of the importer user
2024          * @param object $data     The message object
2025          *
2026          * @return bool always true
2027          */
2028         private static function receivePollParticipation(array $importer, $data)
2029         {
2030                 // We don't support polls by now
2031                 return true;
2032         }
2033
2034         /**
2035          * Processes incoming profile updates
2036          *
2037          * @param array  $importer Array of the importer user
2038          * @param object $data     The message object
2039          *
2040          * @return bool Success
2041          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2042          * @throws \ImagickException
2043          */
2044         private static function receiveProfile(array $importer, $data)
2045         {
2046                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2047
2048                 $contact = self::contactByHandle($importer["uid"], $author);
2049                 if (!$contact) {
2050                         return false;
2051                 }
2052
2053                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2054                 $image_url = XML::unescape($data->image_url);
2055                 $birthday = XML::unescape($data->birthday);
2056                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2057                 $location = Markdown::toBBCode(XML::unescape($data->location));
2058                 $searchable = (XML::unescape($data->searchable) == "true");
2059                 $nsfw = (XML::unescape($data->nsfw) == "true");
2060                 $tags = XML::unescape($data->tag_string);
2061
2062                 $tags = explode("#", $tags);
2063
2064                 $keywords = [];
2065                 foreach ($tags as $tag) {
2066                         $tag = trim(strtolower($tag));
2067                         if ($tag != "") {
2068                                 $keywords[] = $tag;
2069                         }
2070                 }
2071
2072                 $keywords = implode(", ", $keywords);
2073
2074                 $handle_parts = explode("@", $author);
2075                 $nick = $handle_parts[0];
2076
2077                 if ($name === "") {
2078                         $name = $handle_parts[0];
2079                 }
2080
2081                 if (preg_match("|^https?://|", $image_url) === 0) {
2082                         $image_url = "http://".$handle_parts[1].$image_url;
2083                 }
2084
2085                 Contact::updateAvatar($contact["id"], $image_url);
2086
2087                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2088
2089                 $birthday = str_replace("1000", "1901", $birthday);
2090
2091                 if ($birthday != "") {
2092                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2093                 }
2094
2095                 // this is to prevent multiple birthday notifications in a single year
2096                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2097
2098                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2099                         $birthday = $contact["bd"];
2100                 }
2101
2102                 $fields = ['name' => $name, 'location' => $location,
2103                         'name-date' => DateTimeFormat::utcNow(), 'about' => $about,
2104                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2105                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2106
2107                 if (!empty($birthday)) {
2108                         $fields['bd'] = $birthday;
2109                 }
2110
2111                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2112
2113                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2114
2115                 return true;
2116         }
2117
2118         /**
2119          * Processes incoming friend requests
2120          *
2121          * @param array $importer Array of the importer user
2122          * @param array $contact  The contact that send the request
2123          * @return void
2124          * @throws \Exception
2125          */
2126         private static function receiveRequestMakeFriend(array $importer, array $contact)
2127         {
2128                 if ($contact["rel"] == Contact::SHARING) {
2129                         DBA::update(
2130                                 'contact',
2131                                 ['rel' => Contact::FRIEND, 'writable' => true],
2132                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2133                         );
2134                 }
2135         }
2136
2137         /**
2138          * Processes incoming sharing notification
2139          *
2140          * @param array  $importer Array of the importer user
2141          * @param object $data     The message object
2142          *
2143          * @return bool Success
2144          * @throws \Exception
2145          */
2146         private static function receiveContactRequest(array $importer, $data)
2147         {
2148                 $author = XML::unescape($data->author);
2149                 $recipient = XML::unescape($data->recipient);
2150
2151                 if (!$author || !$recipient) {
2152                         return false;
2153                 }
2154
2155                 // the current protocol version doesn't know these fields
2156                 // That means that we will assume their existance
2157                 if (isset($data->following)) {
2158                         $following = (XML::unescape($data->following) == "true");
2159                 } else {
2160                         $following = true;
2161                 }
2162
2163                 if (isset($data->sharing)) {
2164                         $sharing = (XML::unescape($data->sharing) == "true");
2165                 } else {
2166                         $sharing = true;
2167                 }
2168
2169                 $contact = self::contactByHandle($importer["uid"], $author);
2170
2171                 // perhaps we were already sharing with this person. Now they're sharing with us.
2172                 // That makes us friends.
2173                 if ($contact) {
2174                         if ($following) {
2175                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2176                                 self::receiveRequestMakeFriend($importer, $contact);
2177
2178                                 // refetch the contact array
2179                                 $contact = self::contactByHandle($importer["uid"], $author);
2180
2181                                 // If we are now friends, we are sending a share message.
2182                                 // Normally we needn't to do so, but the first message could have been vanished.
2183                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2184                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2185                                         if (DBA::isResult($user)) {
2186                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2187                                                 self::sendShare($user, $contact);
2188                                         }
2189                                 }
2190                                 return true;
2191                         } else {
2192                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2193                                 Contact::removeFollower($importer, $contact);
2194                                 return true;
2195                         }
2196                 }
2197
2198                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2199                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2200                         return false;
2201                 } elseif (!$following && !$sharing) {
2202                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2203                         return false;
2204                 } elseif (!$following && $sharing) {
2205                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2206                 } elseif ($following && $sharing) {
2207                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2208                 } elseif ($following && !$sharing) {
2209                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2210                 }
2211
2212                 $ret = FContact::getByURL($author);
2213
2214                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2215                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2216                         return false;
2217                 }
2218
2219                 $cid = Contact::getIdForURL($ret['url'], $importer['uid']);
2220                 if (!empty($cid)) {
2221                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
2222                 } else {
2223                         $contact = [];
2224                 }
2225
2226                 $item = ['author-id' => Contact::getIdForURL($ret['url']),
2227                         'author-link' => $ret['url']];
2228
2229                 $result = Contact::addRelationship($importer, $contact, $item, false);
2230                 if ($result === true) {
2231                         $contact_record = self::contactByHandle($importer['uid'], $author);
2232                         if (!$contact_record) {
2233                                 Logger::info('unable to locate newly created contact record.');
2234                                 return;
2235                         }
2236
2237                         $user = DBA::selectFirst('user', [], ['uid' => $importer['uid']]);
2238                         if (DBA::isResult($user)) {
2239                                 self::sendShare($user, $contact_record);
2240
2241                                 // Send the profile data, maybe it weren't transmitted before
2242                                 self::sendProfile($importer['uid'], [$contact_record]);
2243                         }
2244                 }
2245
2246                 return true;
2247         }
2248
2249         /**
2250          * Fetches a message with a given guid
2251          *
2252          * @param string $guid        message guid
2253          * @param string $orig_author handle of the original post
2254          * @return array The fetched item
2255          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2256          * @throws \ImagickException
2257          */
2258         public static function originalItem($guid, $orig_author)
2259         {
2260                 if (empty($guid)) {
2261                         Logger::log('Empty guid. Quitting.');
2262                         return false;
2263                 }
2264
2265                 // Do we already have this item?
2266                 $fields = ['body', 'title', 'app', 'created', 'object-type', 'uri', 'guid',
2267                         'author-name', 'author-link', 'author-avatar', 'plink', 'uri-id'];
2268                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2269                 $item = Post::selectFirst($fields, $condition);
2270
2271                 if (DBA::isResult($item)) {
2272                         Logger::log("reshared message ".$guid." already exists on system.");
2273
2274                         // Maybe it is already a reshared item?
2275                         // Then refetch the content, if it is a reshare from a reshare.
2276                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2277                         if (self::isReshare($item["body"], true)) {
2278                                 $item = [];
2279                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2280                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2281
2282                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2283
2284                                 // Add OEmbed and other information to the body
2285                                 $item["body"] = PageInfo::searchAndAppendToBody($item["body"], false, true);
2286
2287                                 return $item;
2288                         } else {
2289                                 return $item;
2290                         }
2291                 }
2292
2293                 if (!DBA::isResult($item)) {
2294                         if (empty($orig_author)) {
2295                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2296                                 return false;
2297                         }
2298
2299                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2300                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2301                         $stored = self::storeByGuid($guid, $server);
2302
2303                         if (!$stored) {
2304                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2305                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2306                                 $stored = self::storeByGuid($guid, $server);
2307                         }
2308
2309                         if ($stored) {
2310                                 $fields = ['body', 'title', 'app', 'created', 'object-type', 'uri', 'guid',
2311                                         'author-name', 'author-link', 'author-avatar', 'plink', 'uri-id'];
2312                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2313                                 $item = Post::selectFirst($fields, $condition);
2314
2315                                 if (DBA::isResult($item)) {
2316                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2317                                         if (self::isReshare($item["body"], false)) {
2318                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2319                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2320                                         }
2321
2322                                         return $item;
2323                                 }
2324                         }
2325                 }
2326                 return false;
2327         }
2328
2329         /**
2330          * Stores a reshare activity
2331          *
2332          * @param array   $item              Array of reshare post
2333          * @param integer $parent_message_id Id of the parent post
2334          * @param string  $guid              GUID string of reshare action
2335          * @param string  $author            Author handle
2336          */
2337         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2338         {
2339                 $parent = Post::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2340
2341                 $datarray = [];
2342
2343                 $datarray['uid'] = $item['uid'];
2344                 $datarray['contact-id'] = $item['contact-id'];
2345                 $datarray['network'] = $item['network'];
2346
2347                 $datarray['author-link'] = $item['author-link'];
2348                 $datarray['author-id'] = $item['author-id'];
2349
2350                 $datarray['owner-link'] = $datarray['author-link'];
2351                 $datarray['owner-id'] = $datarray['author-id'];
2352
2353                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2354                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2355                 $datarray['thr-parent'] = $parent['uri'];
2356
2357                 $datarray['verb'] = $datarray['body'] = Activity::ANNOUNCE;
2358                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2359                 $datarray['object-type'] = Activity\ObjectType::NOTE;
2360
2361                 $datarray['protocol'] = $item['protocol'];
2362                 $datarray['source'] = $item['source'];
2363                 $datarray['direction'] = $item['direction'];
2364
2365                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2366                 $datarray['private'] = $item['private'];
2367                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2368
2369                 if (Item::isTooOld($datarray)) {
2370                         Logger::info('Reshare activity is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
2371                         return false;
2372                 }
2373
2374                 $message_id = Item::insert($datarray);
2375
2376                 if ($message_id) {
2377                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2378                         if ($datarray['uid'] == 0) {
2379                                 Item::distribute($message_id);
2380                         }
2381                 }
2382         }
2383
2384         /**
2385          * Processes a reshare message
2386          *
2387          * @param array  $importer Array of the importer user
2388          * @param object $data     The message object
2389          * @param string $xml      The original XML of the message
2390          *
2391          * @return int the message id
2392          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2393          * @throws \ImagickException
2394          */
2395         private static function receiveReshare(array $importer, $data, $xml, bool $fetched)
2396         {
2397                 $author = Strings::escapeTags(XML::unescape($data->author));
2398                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2399                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2400                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2401                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2402                 /// @todo handle unprocessed property "provider_display_name"
2403                 $public = Strings::escapeTags(XML::unescape($data->public));
2404
2405                 $contact = self::allowedContactByHandle($importer, $author, false);
2406                 if (!$contact) {
2407                         return false;
2408                 }
2409
2410                 $message_id = self::messageExists($importer["uid"], $guid);
2411                 if ($message_id) {
2412                         return true;
2413                 }
2414
2415                 $original_item = self::originalItem($root_guid, $root_author);
2416                 if (!$original_item) {
2417                         return false;
2418                 }
2419
2420                 if (empty($original_item['plink'])) {
2421                         $original_item['plink'] = self::plink($root_author, $root_guid);
2422                 }
2423
2424                 $datarray = [];
2425
2426                 $datarray["uid"] = $importer["uid"];
2427                 $datarray["contact-id"] = $contact["id"];
2428                 $datarray["network"]  = Protocol::DIASPORA;
2429
2430                 $datarray["author-link"] = $contact["url"];
2431                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2432
2433                 $datarray["owner-link"] = $datarray["author-link"];
2434                 $datarray["owner-id"] = $datarray["author-id"];
2435
2436                 $datarray["guid"] = $guid;
2437                 $datarray["uri"] = $datarray["thr-parent"] = self::getUriFromGuid($author, $guid);
2438                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2439
2440                 $datarray["verb"] = Activity::POST;
2441                 $datarray["gravity"] = GRAVITY_PARENT;
2442
2443                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2444                 $datarray["source"] = $xml;
2445                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
2446
2447                 /// @todo Copy tag data from original post
2448
2449                 $prefix = BBCode::getShareOpeningTag(
2450                         $original_item["author-name"],
2451                         $original_item["author-link"],
2452                         $original_item["author-avatar"],
2453                         $original_item["plink"],
2454                         $original_item["created"],
2455                         $original_item["guid"]
2456                 );
2457
2458                 if (!empty($original_item['title'])) {
2459                         $prefix .= '[h3]' . $original_item['title'] . "[/h3]\n";
2460                 }
2461
2462                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2463
2464                 Tag::storeFromBody($datarray['uri-id'], $datarray["body"]);
2465
2466                 Post\Media::copy($original_item['uri-id'], $datarray['uri-id']);
2467                 $datarray["app"]  = $original_item["app"];
2468
2469                 $datarray["plink"] = self::plink($author, $guid);
2470                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2471                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2472
2473                 $datarray["object-type"] = $original_item["object-type"];
2474
2475                 self::fetchGuid($datarray);
2476
2477                 if (Item::isTooOld($datarray)) {
2478                         Logger::info('Reshare is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
2479                         return false;
2480                 }
2481
2482                 $message_id = Item::insert($datarray);
2483
2484                 self::sendParticipation($contact, $datarray);
2485
2486                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2487                 if ($root_message_id) {
2488                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2489                 }
2490
2491                 if ($message_id) {
2492                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2493                         if ($datarray['uid'] == 0) {
2494                                 Item::distribute($message_id);
2495                         }
2496                         return true;
2497                 } else {
2498                         return false;
2499                 }
2500         }
2501
2502         /**
2503          * Processes retractions
2504          *
2505          * @param array  $importer Array of the importer user
2506          * @param array  $contact  The contact of the item owner
2507          * @param object $data     The message object
2508          *
2509          * @return bool success
2510          * @throws \Exception
2511          */
2512         private static function itemRetraction(array $importer, array $contact, $data)
2513         {
2514                 $author = Strings::escapeTags(XML::unescape($data->author));
2515                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2516                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2517
2518                 $person = FContact::getByURL($author);
2519                 if (!is_array($person)) {
2520                         Logger::log("unable to find author detail for ".$author);
2521                         return false;
2522                 }
2523
2524                 if (empty($contact["url"])) {
2525                         $contact["url"] = $person["url"];
2526                 }
2527
2528                 // Fetch items that are about to be deleted
2529                 $fields = ['uid', 'id', 'parent', 'author-link', 'uri-id'];
2530
2531                 // When we receive a public retraction, we delete every item that we find.
2532                 if ($importer['uid'] == 0) {
2533                         $condition = ['guid' => $target_guid, 'deleted' => false];
2534                 } else {
2535                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2536                 }
2537
2538                 $r = Post::select($fields, $condition);
2539                 if (!DBA::isResult($r)) {
2540                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2541                         return false;
2542                 }
2543
2544                 while ($item = Post::fetch($r)) {
2545                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2546                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2547                                 continue;
2548                         }
2549
2550                         // Fetch the parent item
2551                         $parent = Post::selectFirst(['author-link'], ['id' => $item['parent']]);
2552
2553                         // Only delete it if the parent author really fits
2554                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2555                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2556                                 continue;
2557                         }
2558
2559                         Item::markForDeletion(['id' => $item['id']]);
2560
2561                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item['parent'], Logger::DEBUG);
2562                 }
2563                 DBA::close($r);
2564
2565                 return true;
2566         }
2567
2568         /**
2569          * Receives retraction messages
2570          *
2571          * @param array  $importer Array of the importer user
2572          * @param string $sender   The sender of the message
2573          * @param object $data     The message object
2574          *
2575          * @return bool Success
2576          * @throws \Exception
2577          */
2578         private static function receiveRetraction(array $importer, $sender, $data)
2579         {
2580                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2581
2582                 $contact = self::contactByHandle($importer["uid"], $sender);
2583                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2584                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2585                         return false;
2586                 }
2587
2588                 if (!$contact) {
2589                         $contact = [];
2590                 }
2591
2592                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2593
2594                 switch ($target_type) {
2595                         case "Comment":
2596                         case "Like":
2597                         case "Post":
2598                         case "Reshare":
2599                         case "StatusMessage":
2600                                 return self::itemRetraction($importer, $contact, $data);
2601
2602                         case "PollParticipation":
2603                         case "Photo":
2604                                 // Currently unsupported
2605                                 break;
2606
2607                         default:
2608                                 Logger::log("Unknown target type ".$target_type);
2609                                 return false;
2610                 }
2611                 return true;
2612         }
2613
2614         /**
2615          * Checks if an incoming message is wanted
2616          *
2617          * @param string $url
2618          * @param integer $uriid
2619          * @param string $author
2620          * @param string $body
2621          * @return boolean Is the message wanted?
2622          */
2623         private static function isSolicitedMessage(string $url, int $uriid, string $author, string $body)
2624         {
2625                 $contact = Contact::getByURL($author);
2626                 if (DBA::exists('contact', ["`nurl` = ? AND `uid` != ? AND `rel` IN (?, ?)",
2627                         $contact['nurl'], 0, Contact::FRIEND, Contact::SHARING])) {
2628                         Logger::info('Author has got followers - accepted', ['url' => $url, 'author' => $author]);
2629                         return true;
2630                 }
2631
2632                 $taglist = Tag::getByURIId($uriid, [Tag::HASHTAG]);
2633                 $tags = array_column($taglist, 'name');
2634                 return Relay::isSolicitedPost($tags, $body, $contact['id'], $url, Protocol::DIASPORA);
2635         }
2636
2637         /**
2638          * Store an attached photo in the post-media table
2639          *
2640          * @param int $uriid
2641          * @param object $photo
2642          * @return void
2643          */
2644         private static function storePhotoAsMedia(int $uriid, $photo)
2645         {
2646                 $data = [];
2647                 $data['uri-id'] = $uriid;
2648                 $data['type'] = Post\Media::IMAGE;
2649                 $data['url'] = XML::unescape($photo->remote_photo_path) . XML::unescape($photo->remote_photo_name);
2650                 $data['height'] = (int)XML::unescape($photo->height ?? 0);
2651                 $data['width'] = (int)XML::unescape($photo->width ?? 0);
2652                 $data['description'] = XML::unescape($photo->text ?? '');
2653
2654                 Post\Media::insert($data);
2655         }
2656
2657         /**
2658          * Receives status messages
2659          *
2660          * @param array            $importer Array of the importer user
2661          * @param SimpleXMLElement $data     The message object
2662          * @param string           $xml      The original XML of the message
2663          * @param bool             $fetched  The message had been fetched and not pushed
2664          * @return int The message id of the newly created item
2665          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2666          * @throws \ImagickException
2667          */
2668         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml, bool $fetched)
2669         {
2670                 $author = Strings::escapeTags(XML::unescape($data->author));
2671                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2672                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2673                 $public = Strings::escapeTags(XML::unescape($data->public));
2674                 $text = XML::unescape($data->text);
2675                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2676
2677                 $contact = self::allowedContactByHandle($importer, $author, false);
2678                 if (!$contact) {
2679                         return false;
2680                 }
2681
2682                 $message_id = self::messageExists($importer["uid"], $guid);
2683                 if ($message_id) {
2684                         return true;
2685                 }
2686
2687                 $address = [];
2688                 if ($data->location) {
2689                         foreach ($data->location->children() as $fieldname => $data) {
2690                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2691                         }
2692                 }
2693
2694                 $raw_body = $body = Markdown::toBBCode($text);
2695
2696                 $datarray = [];
2697
2698                 $datarray["guid"] = $guid;
2699                 $datarray["uri"] = $datarray["thr-parent"] = self::getUriFromGuid($author, $guid);
2700                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2701
2702                 // Attach embedded pictures to the body
2703                 if ($data->photo) {
2704                         foreach ($data->photo as $photo) {
2705                                 self::storePhotoAsMedia($datarray['uri-id'], $photo);
2706                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2707                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2708                         }
2709
2710                         $datarray["object-type"] = Activity\ObjectType::IMAGE;
2711                 } else {
2712                         $datarray["object-type"] = Activity\ObjectType::NOTE;
2713
2714                         // Add OEmbed and other information to the body
2715                         if (!self::isHubzilla($contact["url"])) {
2716                                 $body = PageInfo::searchAndAppendToBody($body, false, true);
2717                         }
2718                 }
2719
2720                 /// @todo enable support for polls
2721                 //if ($data->poll) {
2722                 //      foreach ($data->poll AS $poll)
2723                 //              print_r($poll);
2724                 //      die("poll!\n");
2725                 //}
2726
2727                 /// @todo enable support for events
2728
2729                 $datarray["uid"] = $importer["uid"];
2730                 $datarray["contact-id"] = $contact["id"];
2731                 $datarray["network"] = Protocol::DIASPORA;
2732
2733                 $datarray["author-link"] = $contact["url"];
2734                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2735
2736                 $datarray["owner-link"] = $datarray["author-link"];
2737                 $datarray["owner-id"] = $datarray["author-id"];
2738
2739                 $datarray["verb"] = Activity::POST;
2740                 $datarray["gravity"] = GRAVITY_PARENT;
2741
2742                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2743                 $datarray["source"] = $xml;
2744                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
2745
2746                 if ($fetched) {
2747                         $datarray["post-type"] = Item::PT_FETCHED;
2748                 } elseif ($datarray["uid"] == 0) {
2749                         $datarray["post-type"] = Item::PT_GLOBAL;
2750                 }
2751
2752                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2753                 $datarray["raw-body"] = self::replacePeopleGuid($raw_body, $contact["url"]);
2754
2755                 self::storeMentions($datarray['uri-id'], $text);
2756                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
2757
2758                 if (!$fetched && !self::isSolicitedMessage($datarray["uri"], $datarray['uri-id'], $author, $body)) {
2759                         DBA::delete('item-uri', ['uri' => $datarray['uri']]);
2760                         return false;
2761                 }
2762
2763                 if ($provider_display_name != "") {
2764                         $datarray["app"] = $provider_display_name;
2765                 }
2766
2767                 $datarray["plink"] = self::plink($author, $guid);
2768                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2769                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2770
2771                 if (isset($address["address"])) {
2772                         $datarray["location"] = $address["address"];
2773                 }
2774
2775                 if (isset($address["lat"]) && isset($address["lng"])) {
2776                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2777                 }
2778
2779                 self::fetchGuid($datarray);
2780
2781                 if (Item::isTooOld($datarray)) {
2782                         Logger::info('Status is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
2783                         return false;
2784                 }
2785
2786                 $message_id = Item::insert($datarray);
2787
2788                 self::sendParticipation($contact, $datarray);
2789
2790                 if ($message_id) {
2791                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2792                         if ($datarray['uid'] == 0) {
2793                                 Item::distribute($message_id);
2794                         }
2795                         return true;
2796                 } else {
2797                         return false;
2798                 }
2799         }
2800
2801         /* ************************************************************************************** *
2802          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2803          * ************************************************************************************** */
2804
2805         /**
2806          * returnes the handle of a contact
2807          *
2808          * @param array $contact contact array
2809          *
2810          * @return string the handle in the format user@domain.tld
2811          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2812          */
2813         private static function myHandle(array $contact)
2814         {
2815                 if (!empty($contact["addr"])) {
2816                         return $contact["addr"];
2817                 }
2818
2819                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2820                 // So - just in case - we build the the address here.
2821                 if ($contact["nickname"] != "") {
2822                         $nick = $contact["nickname"];
2823                 } else {
2824                         $nick = $contact["nick"];
2825                 }
2826
2827                 return $nick . "@" . substr(DI::baseUrl(), strpos(DI::baseUrl(), "://") + 3);
2828         }
2829
2830
2831         /**
2832          * Creates the data for a private message in the new format
2833          *
2834          * @param string $msg     The message that is to be transmitted
2835          * @param array  $user    The record of the sender
2836          * @param array  $contact Target of the communication
2837          * @param string $prvkey  The private key of the sender
2838          * @param string $pubkey  The public key of the receiver
2839          *
2840          * @return string The encrypted data
2841          * @throws \Exception
2842          */
2843         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2844         {
2845                 Logger::log("Message: ".$msg, Logger::DATA);
2846
2847                 // without a public key nothing will work
2848                 if (!$pubkey) {
2849                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
2850                         return false;
2851                 }
2852
2853                 $aes_key = openssl_random_pseudo_bytes(32);
2854                 $b_aes_key = base64_encode($aes_key);
2855                 $iv = openssl_random_pseudo_bytes(16);
2856                 $b_iv = base64_encode($iv);
2857
2858                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
2859
2860                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
2861
2862                 $encrypted_key_bundle = "";
2863                 if (!@openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey)) {
2864                         return false;
2865                 }
2866
2867                 $json_object = json_encode(
2868                         ["aes_key" => base64_encode($encrypted_key_bundle),
2869                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
2870                 );
2871
2872                 return $json_object;
2873         }
2874
2875         /**
2876          * Creates the envelope for the "fetch" endpoint and for the new format
2877          *
2878          * @param string $msg  The message that is to be transmitted
2879          * @param array  $user The record of the sender
2880          *
2881          * @return string The envelope
2882          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2883          */
2884         public static function buildMagicEnvelope($msg, array $user)
2885         {
2886                 $b64url_data = Strings::base64UrlEncode($msg);
2887                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
2888
2889                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
2890                 $type = "application/xml";
2891                 $encoding = "base64url";
2892                 $alg = "RSA-SHA256";
2893                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
2894
2895                 // Fallback if the private key wasn't transmitted in the expected field
2896                 if ($user['uprvkey'] == "") {
2897                         $user['uprvkey'] = $user['prvkey'];
2898                 }
2899
2900                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
2901                 $sig = Strings::base64UrlEncode($signature);
2902
2903                 $xmldata = ["me:env" => ["me:data" => $data,
2904                                                         "@attributes" => ["type" => $type],
2905                                                         "me:encoding" => $encoding,
2906                                                         "me:alg" => $alg,
2907                                                         "me:sig" => $sig,
2908                                                         "@attributes2" => ["key_id" => $key_id]]];
2909
2910                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
2911
2912                 return XML::fromArray($xmldata, $xml, false, $namespaces);
2913         }
2914
2915         /**
2916          * Create the envelope for a message
2917          *
2918          * @param string $msg     The message that is to be transmitted
2919          * @param array  $user    The record of the sender
2920          * @param array  $contact Target of the communication
2921          * @param string $prvkey  The private key of the sender
2922          * @param string $pubkey  The public key of the receiver
2923          * @param bool   $public  Is the message public?
2924          *
2925          * @return string The message that will be transmitted to other servers
2926          * @throws \Exception
2927          */
2928         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
2929         {
2930                 // The message is put into an envelope with the sender's signature
2931                 $envelope = self::buildMagicEnvelope($msg, $user);
2932
2933                 // Private messages are put into a second envelope, encrypted with the receivers public key
2934                 if (!$public) {
2935                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
2936                 }
2937
2938                 return $envelope;
2939         }
2940
2941         /**
2942          * Creates a signature for a message
2943          *
2944          * @param array $owner   the array of the owner of the message
2945          * @param array $message The message that is to be signed
2946          *
2947          * @return string The signature
2948          */
2949         private static function signature($owner, $message)
2950         {
2951                 $sigmsg = $message;
2952                 unset($sigmsg["author_signature"]);
2953                 unset($sigmsg["parent_author_signature"]);
2954
2955                 $signed_text = implode(";", $sigmsg);
2956
2957                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
2958         }
2959
2960         /**
2961          * Transmit a message to a target server
2962          *
2963          * @param array  $owner        the array of the item owner
2964          * @param array  $contact      Target of the communication
2965          * @param string $envelope     The message that is to be transmitted
2966          * @param bool   $public_batch Is it a public post?
2967          * @param string $guid         message guid
2968          *
2969          * @return int Result of the transmission
2970          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2971          * @throws \ImagickException
2972          */
2973         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
2974         {
2975                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
2976                 if (!$enabled) {
2977                         return 200;
2978                 }
2979
2980                 $logid = Strings::getRandomHex(4);
2981
2982                 // We always try to use the data from the fcontact table.
2983                 // This is important for transmitting data to Friendica servers.
2984                 if (!empty($contact['addr'])) {
2985                         $fcontact = FContact::getByURL($contact['addr']);
2986                         if (!empty($fcontact)) {
2987                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
2988                         }
2989                 }
2990
2991                 if (empty($dest_url)) {
2992                         $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
2993                 }
2994
2995                 if (!$dest_url) {
2996                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2997                         return 0;
2998                 }
2999
3000                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3001
3002                 if (!intval(DI::config()->get("system", "diaspora_test"))) {
3003                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3004
3005                         $postResult = DI::httpRequest()->post($dest_url . "/", $envelope, ["Content-Type: " . $content_type]);
3006                         $return_code = $postResult->getReturnCode();
3007                 } else {
3008                         Logger::log("test_mode");
3009                         return 200;
3010                 }
3011
3012                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3013
3014                 return $return_code ? $return_code : -1;
3015         }
3016
3017
3018         /**
3019          * Build the post xml
3020          *
3021          * @param string $type    The message type
3022          * @param array  $message The message data
3023          *
3024          * @return string The post XML
3025          */
3026         public static function buildPostXml($type, $message)
3027         {
3028                 $data = [$type => $message];
3029
3030                 return XML::fromArray($data, $xml);
3031         }
3032
3033         /**
3034          * Builds and transmit messages
3035          *
3036          * @param array  $owner        the array of the item owner
3037          * @param array  $contact      Target of the communication
3038          * @param string $type         The message type
3039          * @param array  $message      The message data
3040          * @param bool   $public_batch Is it a public post?
3041          * @param string $guid         message guid
3042          *
3043          * @return int Result of the transmission
3044          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3045          * @throws \ImagickException
3046          */
3047         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "")
3048         {
3049                 $msg = self::buildPostXml($type, $message);
3050
3051                 Logger::log('message: '.$msg, Logger::DATA);
3052                 Logger::log('send guid '.$guid, Logger::DEBUG);
3053
3054                 // Fallback if the private key wasn't transmitted in the expected field
3055                 if (empty($owner['uprvkey'])) {
3056                         $owner['uprvkey'] = $owner['prvkey'];
3057                 }
3058
3059                 // When sending content to Friendica contacts using the Diaspora protocol
3060                 // we have to fetch the public key from the fcontact.
3061                 // This is due to the fact that legacy DFRN had unique keys for every contact.
3062                 $pubkey = $contact['pubkey'];
3063                 if (!empty($contact['addr'])) {
3064                         $fcontact = FContact::getByURL($contact['addr']);
3065                         if (!empty($fcontact)) {
3066                                 $pubkey = $fcontact['pubkey'];
3067                         }
3068                 }
3069
3070                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
3071
3072                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3073
3074                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3075
3076                 return $return_code;
3077         }
3078
3079         /**
3080          * sends a participation (Used to get all further updates)
3081          *
3082          * @param array $contact Target of the communication
3083          * @param array $item    Item array
3084          *
3085          * @return int The result of the transmission
3086          * @throws \Exception
3087          */
3088         private static function sendParticipation(array $contact, array $item)
3089         {
3090                 // Don't send notifications for private postings
3091                 if ($item['private'] == Item::PRIVATE) {
3092                         return;
3093                 }
3094
3095                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3096
3097                 $result = DI::cache()->get($cachekey);
3098                 if (!is_null($result)) {
3099                         return;
3100                 }
3101
3102                 // Fetch some user id to have a valid handle to transmit the participation.
3103                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3104                 // If the item belongs to a user, we take this user id.
3105                 if ($item['uid'] == 0) {
3106                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3107                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3108                         $owner = User::getOwnerDataById($first_user['uid']);
3109                 } else {
3110                         $owner = User::getOwnerDataById($item['uid']);
3111                 }
3112
3113                 $author = self::myHandle($owner);
3114
3115                 $message = ["author" => $author,
3116                                 "guid" => System::createUUID(),
3117                                 "parent_type" => "Post",
3118                                 "parent_guid" => $item["guid"]];
3119
3120                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3121
3122                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3123                 DI::cache()->set($cachekey, $item["guid"], Duration::QUARTER_HOUR);
3124
3125                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3126         }
3127
3128         /**
3129          * sends an account migration
3130          *
3131          * @param array $owner   the array of the item owner
3132          * @param array $contact Target of the communication
3133          * @param int   $uid     User ID
3134          *
3135          * @return int The result of the transmission
3136          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3137          * @throws \ImagickException
3138          */
3139         public static function sendAccountMigration(array $owner, array $contact, $uid)
3140         {
3141                 $old_handle = DI::pConfig()->get($uid, 'system', 'previous_addr');
3142                 $profile = self::createProfileData($uid);
3143
3144                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3145                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3146
3147                 $message = ["author" => $old_handle,
3148                                 "profile" => $profile,
3149                                 "signature" => $signature];
3150
3151                 Logger::info('Send account migration', ['msg' => $message]);
3152
3153                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3154         }
3155
3156         /**
3157          * Sends a "share" message
3158          *
3159          * @param array $owner   the array of the item owner
3160          * @param array $contact Target of the communication
3161          *
3162          * @return int The result of the transmission
3163          * @throws \Exception
3164          */
3165         public static function sendShare(array $owner, array $contact)
3166         {
3167                 /**
3168                  * @todo support the different possible combinations of "following" and "sharing"
3169                  * Currently, Diaspora only interprets the "sharing" field
3170                  *
3171                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3172                  */
3173
3174                 /*
3175                 switch ($contact["rel"]) {
3176                         case Contact::FRIEND:
3177                                 $following = true;
3178                                 $sharing = true;
3179
3180                         case Contact::SHARING:
3181                                 $following = false;
3182                                 $sharing = true;
3183
3184                         case Contact::FOLLOWER:
3185                                 $following = true;
3186                                 $sharing = false;
3187                 }
3188                 */
3189
3190                 $message = ["author" => self::myHandle($owner),
3191                                 "recipient" => $contact["addr"],
3192                                 "following" => "true",
3193                                 "sharing" => "true"];
3194
3195                 Logger::info('Send share', ['msg' => $message]);
3196
3197                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3198         }
3199
3200         /**
3201          * sends an "unshare"
3202          *
3203          * @param array $owner   the array of the item owner
3204          * @param array $contact Target of the communication
3205          *
3206          * @return int The result of the transmission
3207          * @throws \Exception
3208          */
3209         public static function sendUnshare(array $owner, array $contact)
3210         {
3211                 $message = ["author" => self::myHandle($owner),
3212                                 "recipient" => $contact["addr"],
3213                                 "following" => "false",
3214                                 "sharing" => "false"];
3215
3216                 Logger::info('Send unshare', ['msg' => $message]);
3217
3218                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3219         }
3220
3221         /**
3222          * Checks a message body if it is a reshare
3223          *
3224          * @param string $body     The message body that is to be check
3225          * @param bool   $complete Should it be a complete check or a simple check?
3226          *
3227          * @return array|bool Reshare details or "false" if no reshare
3228          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3229          * @throws \ImagickException
3230          */
3231         public static function isReshare($body, $complete = true)
3232         {
3233                 $body = trim($body);
3234
3235                 $reshared = Item::getShareArray(['body' => $body]);
3236                 if (empty($reshared)) {
3237                         return false;
3238                 }
3239
3240                 // Skip if it isn't a pure repeated messages
3241                 // Does it start with a share?
3242                 if (!empty($reshared['comment']) && $complete) {
3243                         return false;
3244                 }
3245
3246                 if (!empty($reshared['guid']) && $complete) {
3247                         $condition = ['guid' => $reshared['guid'], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3248                         $item = Post::selectFirst(['contact-id'], $condition);
3249                         if (DBA::isResult($item)) {
3250                                 $ret = [];
3251                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3252                                 $ret["root_guid"] = $reshared['guid'];
3253                                 return $ret;
3254                         } elseif ($complete) {
3255                                 // We are resharing something that isn't a DFRN or Diaspora post.
3256                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3257                                 return false;
3258                         }
3259                 } elseif (empty($reshared['guid']) && $complete) {
3260                         return false;
3261                 }
3262
3263                 $ret = [];
3264
3265                 if (!empty($reshared['profile']) && ($cid = Contact::getIdForURL($reshared['profile']))) {
3266                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $cid]);
3267                         if (!empty($contact['addr'])) {
3268                                 $ret['root_handle'] = $contact['addr'];
3269                         }
3270                 }
3271
3272                 if (empty($ret) && !$complete) {
3273                         return true;
3274                 }
3275
3276                 return $ret;
3277         }
3278
3279         /**
3280          * Create an event array
3281          *
3282          * @param integer $event_id The id of the event
3283          *
3284          * @return array with event data
3285          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3286          */
3287         private static function buildEvent($event_id)
3288         {
3289                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3290                 if (!DBA::isResult($r)) {
3291                         return [];
3292                 }
3293
3294                 $event = $r[0];
3295
3296                 $eventdata = [];
3297
3298                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3299                 if (!DBA::isResult($r)) {
3300                         return [];
3301                 }
3302
3303                 $user = $r[0];
3304
3305                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3306                 if (!DBA::isResult($r)) {
3307                         return [];
3308                 }
3309
3310                 $owner = $r[0];
3311
3312                 $eventdata['author'] = self::myHandle($owner);
3313
3314                 if ($event['guid']) {
3315                         $eventdata['guid'] = $event['guid'];
3316                 }
3317
3318                 $mask = DateTimeFormat::ATOM;
3319
3320                 /// @todo - establish "all day" events in Friendica
3321                 $eventdata["all_day"] = "false";
3322
3323                 $eventdata['timezone'] = 'UTC';
3324                 if (!$event['adjust'] && $user['timezone']) {
3325                         $eventdata['timezone'] = $user['timezone'];
3326                 }
3327
3328                 if ($event['start']) {
3329                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3330                 }
3331                 if ($event['finish'] && !$event['nofinish']) {
3332                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3333                 }
3334                 if ($event['summary']) {
3335                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3336                 }
3337                 if ($event['desc']) {
3338                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3339                 }
3340                 if ($event['location']) {
3341                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3342                         $coord = Map::getCoordinates($event['location']);
3343
3344                         $location = [];
3345                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3346                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3347                                 $location["lat"] = $coord['lat'];
3348                                 $location["lng"] = $coord['lon'];
3349                         } else {
3350                                 $location["lat"] = 0;
3351                                 $location["lng"] = 0;
3352                         }
3353                         $eventdata['location'] = $location;
3354                 }
3355
3356                 return $eventdata;
3357         }
3358
3359         /**
3360          * Create a post (status message or reshare)
3361          *
3362          * @param array $item  The item that will be exported
3363          * @param array $owner the array of the item owner
3364          *
3365          * @return array
3366          * 'type' -> Message type ("status_message" or "reshare")
3367          * 'message' -> Array of XML elements of the status
3368          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3369          * @throws \ImagickException
3370          */
3371         public static function buildStatus(array $item, array $owner)
3372         {
3373                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3374
3375                 $result = DI::cache()->get($cachekey);
3376                 if (!is_null($result)) {
3377                         return $result;
3378                 }
3379
3380                 $myaddr = self::myHandle($owner);
3381
3382                 $public = ($item["private"] == Item::PRIVATE ? "false" : "true");
3383                 $created = DateTimeFormat::utc($item['received'], DateTimeFormat::ATOM);
3384                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3385
3386                 // Detect a share element and do a reshare
3387                 if (($item['private'] != Item::PRIVATE) && ($ret = self::isReshare($item["body"]))) {
3388                         $message = ["author" => $myaddr,
3389                                         "guid" => $item["guid"],
3390                                         "created_at" => $created,
3391                                         "root_author" => $ret["root_handle"],
3392                                         "root_guid" => $ret["root_guid"],
3393                                         "provider_display_name" => $item["app"],
3394                                         "public" => $public];
3395
3396                         $type = "reshare";
3397                 } else {
3398                         $title = $item["title"];
3399                         $body = $item["body"];
3400
3401                         // Fetch the title from an attached link - if there is one
3402                         if (empty($item["title"]) && DI::pConfig()->get($owner['uid'], 'system', 'attach_link_title')) {
3403                                 $page_data = BBCode::getAttachmentData($item['body']);
3404                                 if (!empty($page_data['type']) && !empty($page_data['title']) && ($page_data['type'] == 'link')) {
3405                                         $title = $page_data['title'];
3406                                 }
3407                         }
3408
3409                         if ($item['author-link'] != $item['owner-link']) {
3410                                 $body = BBCode::getShareOpeningTag($item['author-name'], $item['author-link'], $item['author-avatar'],
3411                                         $item['plink'], $item['created']) . $body . '[/share]';
3412                         }
3413
3414                         // convert to markdown
3415                         $body = html_entity_decode(BBCode::toMarkdown($body));
3416
3417                         // Adding the title
3418                         if (strlen($title)) {
3419                                 $body = "### ".html_entity_decode($title)."\n\n".$body;
3420                         }
3421
3422                         $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]);
3423                         if (!empty($attachments)) {
3424                                 $body .= "\n".DI::l10n()->t("Attachments:")."\n";
3425                                 foreach ($attachments as $attachment) {
3426                                         $body .= "[" . $attachment['description'] . "](" . $attachment['url'] . ")\n";
3427                                 }
3428                         }
3429
3430                         $location = [];
3431
3432                         if ($item["location"] != "")
3433                                 $location["address"] = $item["location"];
3434
3435                         if ($item["coord"] != "") {
3436                                 $coord = explode(" ", $item["coord"]);
3437                                 $location["lat"] = $coord[0];
3438                                 $location["lng"] = $coord[1];
3439                         }
3440
3441                         $message = ["author" => $myaddr,
3442                                         "guid" => $item["guid"],
3443                                         "created_at" => $created,
3444                                         "edited_at" => $edited,
3445                                         "public" => $public,
3446                                         "text" => $body,
3447                                         "provider_display_name" => $item["app"],
3448                                         "location" => $location];
3449
3450                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3451                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3452                                 unset($message["location"]);
3453                         }
3454
3455                         if ($item['event-id'] > 0) {
3456                                 $event = self::buildEvent($item['event-id']);
3457                                 if (count($event)) {
3458                                         $message['event'] = $event;
3459
3460                                         if (!empty($event['location']['address']) &&
3461                                                 !empty($event['location']['lat']) &&
3462                                                 !empty($event['location']['lng'])) {
3463                                                 $message['location'] = $event['location'];
3464                                         }
3465
3466                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3467                                         // $message['text'] = '';
3468                                 }
3469                         }
3470
3471                         $type = "status_message";
3472                 }
3473
3474                 $msg = ["type" => $type, "message" => $message];
3475
3476                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
3477
3478                 return $msg;
3479         }
3480
3481         private static function prependParentAuthorMention($body, $profile_url)
3482         {
3483                 $profile = Contact::getByURL($profile_url, false, ['addr', 'name', 'contact-type']);
3484                 if (!empty($profile['addr'])
3485                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3486                         && !strstr($body, $profile['addr'])
3487                         && !strstr($body, $profile_url)
3488                 ) {
3489                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3490                 }
3491
3492                 return $body;
3493         }
3494
3495         /**
3496          * Sends a post
3497          *
3498          * @param array $item         The item that will be exported
3499          * @param array $owner        the array of the item owner
3500          * @param array $contact      Target of the communication
3501          * @param bool  $public_batch Is it a public post?
3502          *
3503          * @return int The result of the transmission
3504          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3505          * @throws \ImagickException
3506          */
3507         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3508         {
3509                 $status = self::buildStatus($item, $owner);
3510
3511                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3512         }
3513
3514         /**
3515          * Creates a "like" 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 a "like"
3521          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3522          */
3523         private static function constructLike(array $item, array $owner)
3524         {
3525                 $parent = Post::selectFirst(['guid', 'uri', 'thr-parent'], ['uri' => $item["thr-parent"]]);
3526                 if (!DBA::isResult($parent)) {
3527                         return false;
3528                 }
3529
3530                 $target_type = ($parent["uri"] === $parent["thr-parent"] ? "Post" : "Comment");
3531                 $positive = null;
3532                 if ($item['verb'] === Activity::LIKE) {
3533                         $positive = "true";
3534                 } elseif ($item['verb'] === Activity::DISLIKE) {
3535                         $positive = "false";
3536                 }
3537
3538                 return(["author" => self::myHandle($owner),
3539                                 "guid" => $item["guid"],
3540                                 "parent_guid" => $parent["guid"],
3541                                 "parent_type" => $target_type,
3542                                 "positive" => $positive,
3543                                 "author_signature" => ""]);
3544         }
3545
3546         /**
3547          * Creates an "EventParticipation" object
3548          *
3549          * @param array $item  The item that will be exported
3550          * @param array $owner the array of the item owner
3551          *
3552          * @return array The data for an "EventParticipation"
3553          * @throws \Exception
3554          */
3555         private static function constructAttend(array $item, array $owner)
3556         {
3557                 $parent = Post::selectFirst(['guid'], ['uri' => $item['thr-parent']]);
3558                 if (!DBA::isResult($parent)) {
3559                         return false;
3560                 }
3561
3562                 switch ($item['verb']) {
3563                         case Activity::ATTEND:
3564                                 $attend_answer = 'accepted';
3565                                 break;
3566                         case Activity::ATTENDNO:
3567                                 $attend_answer = 'declined';
3568                                 break;
3569                         case Activity::ATTENDMAYBE:
3570                                 $attend_answer = 'tentative';
3571                                 break;
3572                         default:
3573                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3574                                 return false;
3575                 }
3576
3577                 return(["author" => self::myHandle($owner),
3578                                 "guid" => $item["guid"],
3579                                 "parent_guid" => $parent["guid"],
3580                                 "status" => $attend_answer,
3581                                 "author_signature" => ""]);
3582         }
3583
3584         /**
3585          * Creates the object for a comment
3586          *
3587          * @param array $item  The item that will be exported
3588          * @param array $owner the array of the item owner
3589          *
3590          * @return array|false The data for a comment
3591          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3592          */
3593         private static function constructComment(array $item, array $owner)
3594         {
3595                 $cachekey = "diaspora:constructComment:".$item['guid'];
3596
3597                 $result = DI::cache()->get($cachekey);
3598                 if (!is_null($result)) {
3599                         return $result;
3600                 }
3601
3602                 $toplevel_item = Post::selectFirst(['guid', 'author-id', 'author-link'], ['id' => $item['parent'], 'parent' => $item['parent']]);
3603                 if (!DBA::isResult($toplevel_item)) {
3604                         Logger::error('Missing parent conversation item', ['parent' => $item['parent']]);
3605                         return false;
3606                 }
3607
3608                 $thread_parent_item = $toplevel_item;
3609                 if ($item['thr-parent'] != $item['parent-uri']) {
3610                         $thread_parent_item = Post::selectFirst(['guid', 'author-id', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3611                 }
3612
3613                 $body = $item["body"];
3614
3615                 // The replied to autor mention is prepended for clarity if:
3616                 // - Item replied isn't yours
3617                 // - Item is public or explicit mentions are disabled
3618                 // - Implicit mentions are enabled
3619                 if (
3620                         $item['author-id'] != $thread_parent_item['author-id']
3621                         && (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3622                         && !DI::config()->get('system', 'disable_implicit_mentions')
3623                 ) {
3624                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3625                 }
3626
3627                 $text = html_entity_decode(BBCode::toMarkdown($body));
3628                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3629                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3630
3631                 $comment = [
3632                         "author"      => self::myHandle($owner),
3633                         "guid"        => $item["guid"],
3634                         "created_at"  => $created,
3635                         "edited_at"   => $edited,
3636                         "parent_guid" => $toplevel_item["guid"],
3637                         "text"        => $text,
3638                         "author_signature" => ""
3639                 ];
3640
3641                 // Send the thread parent guid only if it is a threaded comment
3642                 if ($item['thr-parent'] != $item['parent-uri']) {
3643                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3644                 }
3645
3646                 DI::cache()->set($cachekey, $comment, Duration::QUARTER_HOUR);
3647
3648                 return($comment);
3649         }
3650
3651         /**
3652          * Send a like or a comment
3653          *
3654          * @param array $item         The item that will be exported
3655          * @param array $owner        the array of the item owner
3656          * @param array $contact      Target of the communication
3657          * @param bool  $public_batch Is it a public post?
3658          *
3659          * @return int The result of the transmission
3660          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3661          * @throws \ImagickException
3662          */
3663         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3664         {
3665                 if (in_array($item['verb'], [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE])) {
3666                         $message = self::constructAttend($item, $owner);
3667                         $type = "event_participation";
3668                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3669                         $message = self::constructLike($item, $owner);
3670                         $type = "like";
3671                 } elseif (!in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
3672                         $message = self::constructComment($item, $owner);
3673                         $type = "comment";
3674                 }
3675
3676                 if (empty($message)) {
3677                         return false;
3678                 }
3679
3680                 $message["author_signature"] = self::signature($owner, $message);
3681
3682                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3683         }
3684
3685         /**
3686          * Relays messages (like, comment, retraction) to other servers if we are the thread owner
3687          *
3688          * @param array $item         The item that will be exported
3689          * @param array $owner        the array of the item owner
3690          * @param array $contact      Target of the communication
3691          * @param bool  $public_batch Is it a public post?
3692          *
3693          * @return int The result of the transmission
3694          * @throws \Exception
3695          */
3696         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3697         {
3698                 if ($item["deleted"]) {
3699                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3700                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3701                         $type = "like";
3702                 } else {
3703                         $type = "comment";
3704                 }
3705
3706                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3707
3708                 $msg = json_decode($item['signed_text'], true);
3709
3710                 $message = [];
3711                 if (is_array($msg)) {
3712                         foreach ($msg as $field => $data) {
3713                                 if (!$item["deleted"]) {
3714                                         if ($field == "diaspora_handle") {
3715                                                 $field = "author";
3716                                         }
3717                                         if ($field == "target_type") {
3718                                                 $field = "parent_type";
3719                                         }
3720                                 }
3721
3722                                 $message[$field] = $data;
3723                         }
3724                 } else {
3725                         Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3726                 }
3727
3728                 $message["parent_author_signature"] = self::signature($owner, $message);
3729
3730                 Logger::info('Relayed data', ['msg' => $message]);
3731
3732                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3733         }
3734
3735         /**
3736          * Sends a retraction (deletion) of a message, like or comment
3737          *
3738          * @param array $item         The item that will be exported
3739          * @param array $owner        the array of the item owner
3740          * @param array $contact      Target of the communication
3741          * @param bool  $public_batch Is it a public post?
3742          * @param bool  $relay        Is the retraction transmitted from a relay?
3743          *
3744          * @return int The result of the transmission
3745          * @throws \Exception
3746          */
3747         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3748         {
3749                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3750
3751                 $msg_type = "retraction";
3752
3753                 if ($item['gravity'] == GRAVITY_PARENT) {
3754                         $target_type = "Post";
3755                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3756                         $target_type = "Like";
3757                 } else {
3758                         $target_type = "Comment";
3759                 }
3760
3761                 $message = ["author" => $itemaddr,
3762                                 "target_guid" => $item['guid'],
3763                                 "target_type" => $target_type];
3764
3765                 Logger::info('Got message', ['msg' => $message]);
3766
3767                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3768         }
3769
3770         /**
3771          * Sends a mail
3772          *
3773          * @param array $item    The item that will be exported
3774          * @param array $owner   The owner
3775          * @param array $contact Target of the communication
3776          *
3777          * @return int The result of the transmission
3778          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3779          * @throws \ImagickException
3780          */
3781         public static function sendMail(array $item, array $owner, array $contact)
3782         {
3783                 $myaddr = self::myHandle($owner);
3784
3785                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
3786                 if (!DBA::isResult($cnv)) {
3787                         Logger::log("conversation not found.");
3788                         return;
3789                 }
3790
3791                 $body = BBCode::toMarkdown($item["body"]);
3792                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3793
3794                 $msg = [
3795                         "author" => $myaddr,
3796                         "guid" => $item["guid"],
3797                         "conversation_guid" => $cnv["guid"],
3798                         "text" => $body,
3799                         "created_at" => $created,
3800                 ];
3801
3802                 if ($item["reply"]) {
3803                         $message = $msg;
3804                         $type = "message";
3805                 } else {
3806                         $message = [
3807                                 "author" => $cnv["creator"],
3808                                 "guid" => $cnv["guid"],
3809                                 "subject" => $cnv["subject"],
3810                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
3811                                 "participants" => $cnv["recips"],
3812                                 "message" => $msg
3813                         ];
3814
3815                         $type = "conversation";
3816                 }
3817
3818                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
3819         }
3820
3821         /**
3822          * Split a name into first name and last name
3823          *
3824          * @param string $name The name
3825          *
3826          * @return array The array with "first" and "last"
3827          */
3828         public static function splitName($name) {
3829                 $name = trim($name);
3830
3831                 // Is the name longer than 64 characters? Then cut the rest of it.
3832                 if (strlen($name) > 64) {
3833                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
3834                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
3835                         } else {
3836                                 $name = substr($name, 0, 64);
3837                         }
3838                 }
3839
3840                 // Take the first word as first name
3841                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
3842                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3843                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3844                         return ['first' => $first, 'last' => $last];
3845                 }
3846
3847                 // Take the last word as last name
3848                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
3849                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3850
3851                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3852                         return ['first' => $first, 'last' => $last];
3853                 }
3854
3855                 // Take the first 32 characters if there is no space in the first 32 characters
3856                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
3857                         $first = substr($name, 0, 32);
3858                         $last = substr($name, 32);
3859                         return ['first' => $first, 'last' => $last];
3860                 }
3861
3862                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
3863                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3864
3865                 // Check if the last name is longer than 32 characters
3866                 if (strlen($last) > 32) {
3867                         if (strpos($last, ' ') <= 32) {
3868                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
3869                         } else {
3870                                 $last = substr($last, 0, 32);
3871                         }
3872                 }
3873
3874                 return ['first' => $first, 'last' => $last];
3875         }
3876
3877         /**
3878          * Create profile data
3879          *
3880          * @param int $uid The user id
3881          *
3882          * @return array The profile data
3883          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3884          */
3885         private static function createProfileData($uid)
3886         {
3887                 $profile = DBA::selectFirst('owner-view', ['uid', 'addr', 'name', 'location', 'net-publish', 'dob', 'about', 'pub_keywords'], ['uid' => $uid]);
3888                 if (!DBA::isResult($profile)) {
3889                         return [];
3890                 }
3891
3892                 $handle = $profile["addr"];
3893
3894                 $split_name = self::splitName($profile['name']);
3895                 $first = $split_name['first'];
3896                 $last = $split_name['last'];
3897
3898                 $large = DI::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3899                 $medium = DI::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3900                 $small = DI::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3901                 $searchable = ($profile['net-publish'] ? 'true' : 'false');
3902
3903                 $dob = null;
3904                 $about = null;
3905                 $location = null;
3906                 $tags = null;
3907                 if ($searchable === 'true') {
3908                         $dob = '';
3909
3910                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
3911                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
3912                                 if ($year < 1004) {
3913                                         $year = 1004;
3914                                 }
3915                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
3916                         }
3917
3918                         $about = BBCode::toMarkdown($profile['about']);
3919
3920                         $location = $profile['location'];
3921                         $tags = '';
3922                         if ($profile['pub_keywords']) {
3923                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
3924                                 $kw = str_replace('  ', ' ', $kw);
3925                                 $arr = explode(' ', $kw);
3926                                 if (count($arr)) {
3927                                         for ($x = 0; $x < 5; $x ++) {
3928                                                 if (!empty($arr[$x])) {
3929                                                         $tags .= '#'. trim($arr[$x]) .' ';
3930                                                 }
3931                                         }
3932                                 }
3933                         }
3934                         $tags = trim($tags);
3935                 }
3936
3937                 return ["author" => $handle,
3938                                 "first_name" => $first,
3939                                 "last_name" => $last,
3940                                 "image_url" => $large,
3941                                 "image_url_medium" => $medium,
3942                                 "image_url_small" => $small,
3943                                 "birthday" => $dob,
3944                                 "bio" => $about,
3945                                 "location" => $location,
3946                                 "searchable" => $searchable,
3947                                 "nsfw" => "false",
3948                                 "tag_string" => $tags];
3949         }
3950
3951         /**
3952          * Sends profile data
3953          *
3954          * @param int  $uid    The user id
3955          * @param bool $recips optional, default false
3956          * @return void
3957          * @throws \Exception
3958          */
3959         public static function sendProfile($uid, $recips = false)
3960         {
3961                 if (!$uid) {
3962                         return;
3963                 }
3964
3965                 $owner = User::getOwnerDataById($uid);
3966                 if (!$owner) {
3967                         return;
3968                 }
3969
3970                 if (!$recips) {
3971                         $recips = q(
3972                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3973                                 AND `uid` = %d AND `rel` != %d",
3974                                 DBA::escape(Protocol::DIASPORA),
3975                                 intval($uid),
3976                                 intval(Contact::SHARING)
3977                         );
3978                 }
3979
3980                 if (!$recips) {
3981                         return;
3982                 }
3983
3984                 $message = self::createProfileData($uid);
3985
3986                 // @ToDo Split this into single worker jobs
3987                 foreach ($recips as $recip) {
3988                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
3989                         self::buildAndTransmit($owner, $recip, "profile", $message);
3990                 }
3991         }
3992
3993         /**
3994          * Creates the signature for likes that are created on our system
3995          *
3996          * @param integer $uid  The user of that comment
3997          * @param array   $item Item array
3998          *
3999          * @return array Signed content
4000          * @throws \Exception
4001          */
4002         public static function createLikeSignature($uid, array $item)
4003         {
4004                 $owner = User::getOwnerDataById($uid);
4005                 if (empty($owner)) {
4006                         Logger::info('No owner post, so not storing signature');
4007                         return false;
4008                 }
4009
4010                 if (!in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4011                         return false;
4012                 }
4013
4014                 $message = self::constructLike($item, $owner);
4015                 if ($message === false) {
4016                         return false;
4017                 }
4018
4019                 $message["author_signature"] = self::signature($owner, $message);
4020
4021                 return $message;
4022         }
4023
4024         /**
4025          * Creates the signature for Comments that are created on our system
4026          *
4027          * @param integer $uid  The user of that comment
4028          * @param array   $item Item array
4029          *
4030          * @return array Signed content
4031          * @throws \Exception
4032          */
4033         public static function createCommentSignature($uid, array $item)
4034         {
4035                 $owner = User::getOwnerDataById($uid);
4036                 if (empty($owner)) {
4037                         Logger::info('No owner post, so not storing signature');
4038                         return false;
4039                 }
4040
4041                 $parent = Post::selectFirst(['parent-uri'], ['uri' => $item['thr-parent']]);
4042                 if (!DBA::isResult($parent)) {
4043                         return;
4044                 }
4045
4046                 $item['parent-uri'] = $parent['parent-uri'];
4047
4048                 $message = self::constructComment($item, $owner);
4049                 if ($message === false) {
4050                         return false;
4051                 }
4052
4053                 $message["author_signature"] = self::signature($owner, $message);
4054
4055                 return $message;
4056         }
4057 }