src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   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\Text\BBCode;
  26 use Friendica\Content\Text\Markdown;
  27 use Friendica\Core\Cache\Duration;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Core\System;
  31 use Friendica\Core\Worker;
  32 use Friendica\Database\DBA;
  33 use Friendica\DI;
  34 use Friendica\Model\Contact;
  35 use Friendica\Model\Conversation;
  36 use Friendica\Model\FContact;
  37 use Friendica\Model\GServer;
  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    $level  Endless loop prevention
1062          *
1063          * @return array
1064          *      'message' => The message XML
1065          *      'author' => The author handle
1066          *      'key' => The public key of the author
1067          * @throws \Exception
1068          */
1069         public static function message($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                         //self::sendRetraction($item, $owner, $contact, in_array($item['private'], [self::UNLISTED, self::PUBLIC]));
1499                         return false;
1500                 }
1501
1502                 if (!empty($contact['gsid'])) {
1503                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::DIASPORA);
1504                 }
1505
1506                 $message_id = self::messageExists($importer["uid"], $guid);
1507                 if ($message_id) {
1508                         return true;
1509                 }
1510
1511                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1512                 if (!$toplevel_parent_item) {
1513                         return false;
1514                 }
1515
1516                 $person = FContact::getByURL($author);
1517                 if (!is_array($person)) {
1518                         Logger::log("unable to find author details");
1519                         return false;
1520                 }
1521
1522                 // Fetch the contact id - if we know this contact
1523                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1524
1525                 $datarray = [];
1526
1527                 $datarray["uid"] = $importer["uid"];
1528                 $datarray["contact-id"] = $author_contact["cid"];
1529                 $datarray["network"]  = $author_contact["network"];
1530
1531                 $datarray["author-link"] = $person["url"];
1532                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1533
1534                 $datarray["owner-link"] = $contact["url"];
1535                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1536
1537                 // Will be overwritten for sharing accounts in Item::insert
1538                 if ($fetched) {
1539                         $datarray["post-reason"] = Item::PR_FETCHED;
1540                 } elseif ($datarray["uid"] == 0) {
1541                         $datarray["post-reason"] = Item::PR_GLOBAL;
1542                 } else {
1543                         $datarray["post-reason"] = Item::PR_COMMENT;
1544                 }
1545
1546                 $datarray["guid"] = $guid;
1547                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1548                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
1549
1550                 $datarray["verb"] = Activity::POST;
1551                 $datarray["gravity"] = GRAVITY_COMMENT;
1552
1553                 $datarray['thr-parent'] = $thr_parent ?: $toplevel_parent_item['uri'];
1554
1555                 $datarray["object-type"] = Activity\ObjectType::COMMENT;
1556                 $datarray["post-type"] = Item::PT_NOTE;
1557
1558                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1559                 $datarray["source"] = $xml;
1560                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
1561
1562                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1563
1564                 $datarray["plink"] = self::plink($author, $guid, $toplevel_parent_item['guid']);
1565                 $body = Markdown::toBBCode($text);
1566
1567                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1568
1569                 self::storeMentions($datarray['uri-id'], $text);
1570                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
1571
1572                 self::fetchGuid($datarray);
1573
1574                 // If we are the origin of the parent we store the original data.
1575                 // We notify our followers during the item storage.
1576                 if ($toplevel_parent_item["origin"]) {
1577                         $datarray['diaspora_signed_text'] = json_encode($data);
1578                 }
1579
1580                 if (Item::isTooOld($datarray)) {
1581                         Logger::info('Comment is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
1582                         return false;
1583                 }
1584
1585                 $message_id = Item::insert($datarray);
1586
1587                 if ($message_id <= 0) {
1588                         return false;
1589                 }
1590
1591                 if ($message_id) {
1592                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1593                         if ($datarray['uid'] == 0) {
1594                                 Item::distribute($message_id, json_encode($data));
1595                         }
1596                 }
1597
1598                 return true;
1599         }
1600
1601         /**
1602          * processes and stores private messages
1603          *
1604          * @param array  $importer     Array of the importer user
1605          * @param array  $contact      The contact of the message
1606          * @param object $data         The message object
1607          * @param array  $msg          Array of the processed message, author handle and key
1608          * @param object $mesg         The private message
1609          * @param array  $conversation The conversation record to which this message belongs
1610          *
1611          * @return bool "true" if it was successful
1612          * @throws \Exception
1613          */
1614         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1615         {
1616                 $author = Strings::escapeTags(XML::unescape($data->author));
1617                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1618                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1619
1620                 // "diaspora_handle" is the element name from the old version
1621                 // "author" is the element name from the new version
1622                 if ($mesg->author) {
1623                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1624                 } elseif ($mesg->diaspora_handle) {
1625                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1626                 } else {
1627                         return false;
1628                 }
1629
1630                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1631                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1632                 $msg_text = XML::unescape($mesg->text);
1633                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1634
1635                 if ($msg_conversation_guid != $guid) {
1636                         Logger::log("message conversation guid does not belong to the current conversation.");
1637                         return false;
1638                 }
1639
1640                 $body = Markdown::toBBCode($msg_text);
1641                 $message_uri = $msg_author.":".$msg_guid;
1642
1643                 $person = FContact::getByURL($msg_author);
1644
1645                 return Mail::insert([
1646                         'uid'        => $importer['uid'],
1647                         'guid'       => $msg_guid,
1648                         'convid'     => $conversation['id'],
1649                         'from-name'  => $person['name'],
1650                         'from-photo' => $person['photo'],
1651                         'from-url'   => $person['url'],
1652                         'contact-id' => $contact['id'],
1653                         'title'      => $subject,
1654                         'body'       => $body,
1655                         'uri'        => $message_uri,
1656                         'parent-uri' => $author . ':' . $guid,
1657                         'created'    => $msg_created_at
1658                 ]);
1659         }
1660
1661         /**
1662          * Processes new private messages (answers to private messages are processed elsewhere)
1663          *
1664          * @param array  $importer Array of the importer user
1665          * @param array  $msg      Array of the processed message, author handle and key
1666          * @param object $data     The message object
1667          *
1668          * @return bool Success
1669          * @throws \Exception
1670          */
1671         private static function receiveConversation(array $importer, $msg, $data)
1672         {
1673                 $author = Strings::escapeTags(XML::unescape($data->author));
1674                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1675                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1676                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1677                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1678
1679                 $messages = $data->message;
1680
1681                 if (!count($messages)) {
1682                         Logger::log("empty conversation");
1683                         return false;
1684                 }
1685
1686                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1687                 if (!$contact) {
1688                         return false;
1689                 }
1690
1691                 if (!empty($contact['gsid'])) {
1692                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::DIASPORA);
1693                 }
1694
1695                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1696                 if (!DBA::isResult($conversation)) {
1697                         $r = q(
1698                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1699                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1700                                 intval($importer["uid"]),
1701                                 DBA::escape($guid),
1702                                 DBA::escape($author),
1703                                 DBA::escape($created_at),
1704                                 DBA::escape(DateTimeFormat::utcNow()),
1705                                 DBA::escape($subject),
1706                                 DBA::escape($participants)
1707                         );
1708                         if ($r) {
1709                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1710                         }
1711                 }
1712                 if (!$conversation) {
1713                         Logger::log("unable to create conversation.");
1714                         return false;
1715                 }
1716
1717                 foreach ($messages as $mesg) {
1718                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1719                 }
1720
1721                 return true;
1722         }
1723
1724         /**
1725          * Processes "like" messages
1726          *
1727          * @param array  $importer Array of the importer user
1728          * @param string $sender   The sender of the message
1729          * @param object $data     The message object
1730          *
1731          * @return int The message id of the generated like or "false" if there was an error
1732          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1733          * @throws \ImagickException
1734          */
1735         private static function receiveLike(array $importer, $sender, $data, bool $fetched)
1736         {
1737                 $author = Strings::escapeTags(XML::unescape($data->author));
1738                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1739                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1740                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
1741                 $positive = Strings::escapeTags(XML::unescape($data->positive));
1742
1743                 // likes on comments aren't supported by Diaspora - only on posts
1744                 // But maybe this will be supported in the future, so we will accept it.
1745                 if (!in_array($parent_type, ["Post", "Comment"])) {
1746                         return false;
1747                 }
1748
1749                 $contact = self::allowedContactByHandle($importer, $sender, true);
1750                 if (!$contact) {
1751                         return false;
1752                 }
1753
1754                 if (!empty($contact['gsid'])) {
1755                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::DIASPORA);
1756                 }
1757
1758                 $message_id = self::messageExists($importer["uid"], $guid);
1759                 if ($message_id) {
1760                         return true;
1761                 }
1762
1763                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1764                 if (!$toplevel_parent_item) {
1765                         return false;
1766                 }
1767
1768                 $person = FContact::getByURL($author);
1769                 if (!is_array($person)) {
1770                         Logger::log("unable to find author details");
1771                         return false;
1772                 }
1773
1774                 // Fetch the contact id - if we know this contact
1775                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1776
1777                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1778                 // We would accept this anyhow.
1779                 if ($positive == "true") {
1780                         $verb = Activity::LIKE;
1781                 } else {
1782                         $verb = Activity::DISLIKE;
1783                 }
1784
1785                 $datarray = [];
1786
1787                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1788                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
1789
1790                 $datarray["uid"] = $importer["uid"];
1791                 $datarray["contact-id"] = $author_contact["cid"];
1792                 $datarray["network"]  = $author_contact["network"];
1793
1794                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1795                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1796
1797                 $datarray["guid"] = $guid;
1798                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1799
1800                 $datarray["verb"] = $verb;
1801                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1802                 $datarray['thr-parent'] = $toplevel_parent_item['uri'];
1803
1804                 $datarray["object-type"] = Activity\ObjectType::NOTE;
1805
1806                 $datarray["body"] = $verb;
1807
1808                 // Diaspora doesn't provide a date for likes
1809                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1810
1811                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
1812                 if ($toplevel_parent_item['gravity'] != GRAVITY_PARENT) {
1813                         $toplevel = Post::selectFirst(['origin'], ['id' => $toplevel_parent_item['parent']]);
1814                         $origin = $toplevel["origin"];
1815                 } else {
1816                         $origin = $toplevel_parent_item["origin"];
1817                 }
1818
1819                 // If we are the origin of the parent we store the original data.
1820                 // We notify our followers during the item storage.
1821                 if ($origin) {
1822                         $datarray['diaspora_signed_text'] = json_encode($data);
1823                 }
1824
1825                 if (Item::isTooOld($datarray)) {
1826                         Logger::info('Like is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
1827                         return false;
1828                 }
1829
1830                 $message_id = Item::insert($datarray);
1831
1832                 if ($message_id <= 0) {
1833                         return false;
1834                 }
1835
1836                 if ($message_id) {
1837                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1838                         if ($datarray['uid'] == 0) {
1839                                 Item::distribute($message_id, json_encode($data));
1840                         }
1841                 }
1842
1843                 return true;
1844         }
1845
1846         /**
1847          * Processes private messages
1848          *
1849          * @param array  $importer Array of the importer user
1850          * @param object $data     The message object
1851          *
1852          * @return bool Success?
1853          * @throws \Exception
1854          */
1855         private static function receiveMessage(array $importer, $data)
1856         {
1857                 $author = Strings::escapeTags(XML::unescape($data->author));
1858                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1859                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
1860                 $text = XML::unescape($data->text);
1861                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1862
1863                 $contact = self::allowedContactByHandle($importer, $author, true);
1864                 if (!$contact) {
1865                         return false;
1866                 }
1867
1868                 if (!empty($contact['gsid'])) {
1869                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::DIASPORA);
1870                 }
1871
1872                 $conversation = null;
1873
1874                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
1875                 $conversation = DBA::selectFirst('conv', [], $condition);
1876
1877                 if (!DBA::isResult($conversation)) {
1878                         Logger::log("conversation not available.");
1879                         return false;
1880                 }
1881
1882                 $message_uri = $author.":".$guid;
1883
1884                 $person = FContact::getByURL($author);
1885                 if (!$person) {
1886                         Logger::log("unable to find author details");
1887                         return false;
1888                 }
1889
1890                 $body = Markdown::toBBCode($text);
1891
1892                 $body = self::replacePeopleGuid($body, $person["url"]);
1893
1894                 return Mail::insert([
1895                         'uid'        => $importer['uid'],
1896                         'guid'       => $guid,
1897                         'convid'     => $conversation['id'],
1898                         'from-name'  => $person['name'],
1899                         'from-photo' => $person['photo'],
1900                         'from-url'   => $person['url'],
1901                         'contact-id' => $contact['id'],
1902                         'title'      => $conversation['subject'],
1903                         'body'       => $body,
1904                         'reply'      => 1,
1905                         'uri'        => $message_uri,
1906                         'parent-uri' => $author.":".$conversation['guid'],
1907                         'created'    => $created_at
1908                 ]);
1909         }
1910
1911         /**
1912          * Processes participations - unsupported by now
1913          *
1914          * @param array  $importer Array of the importer user
1915          * @param object $data     The message object
1916          *
1917          * @return bool success
1918          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1919          * @throws \ImagickException
1920          */
1921         private static function receiveParticipation(array $importer, $data, bool $fetched)
1922         {
1923                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
1924                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1925                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1926
1927                 $contact = self::allowedContactByHandle($importer, $author, true);
1928                 if (!$contact) {
1929                         return false;
1930                 }
1931
1932                 if (!empty($contact['gsid'])) {
1933                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::DIASPORA);
1934                 }
1935
1936                 if (self::messageExists($importer["uid"], $guid)) {
1937                         return true;
1938                 }
1939
1940                 $toplevel_parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1941                 if (!$toplevel_parent_item) {
1942                         return false;
1943                 }
1944
1945                 if (!$toplevel_parent_item['origin']) {
1946                         Logger::info('Not our origin. Participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
1947                 }
1948
1949                 if (!in_array($toplevel_parent_item['private'], [Item::PUBLIC, Item::UNLISTED])) {
1950                         Logger::info('Item is not public, participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
1951                         return false;
1952                 }
1953
1954                 $person = FContact::getByURL($author);
1955                 if (!is_array($person)) {
1956                         Logger::log("Person not found: ".$author);
1957                         return false;
1958                 }
1959
1960                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1961
1962                 // Store participation
1963                 $datarray = [];
1964
1965                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1966                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
1967
1968                 $datarray["uid"] = $importer["uid"];
1969                 $datarray["contact-id"] = $author_contact["cid"];
1970                 $datarray["network"]  = $author_contact["network"];
1971
1972                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1973                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1974
1975                 $datarray["guid"] = $guid;
1976                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1977
1978                 $datarray["verb"] = Activity::FOLLOW;
1979                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1980                 $datarray['thr-parent'] = $toplevel_parent_item['uri'];
1981
1982                 $datarray["object-type"] = Activity\ObjectType::NOTE;
1983
1984                 $datarray["body"] = Activity::FOLLOW;
1985
1986                 // Diaspora doesn't provide a date for a participation
1987                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1988
1989                 if (Item::isTooOld($datarray)) {
1990                         Logger::info('Participation is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
1991                         return false;
1992                 }
1993
1994                 $message_id = Item::insert($datarray);
1995
1996                 Logger::info('Participation stored', ['id' => $message_id, 'guid' => $guid, 'parent_guid' => $parent_guid, 'author' => $author]);
1997
1998                 // Send all existing comments and likes to the requesting server
1999                 $comments = Post::select(['id', 'uri-id', 'parent-author-network', 'author-network', 'verb'],
2000                         ['parent' => $toplevel_parent_item['id'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
2001                 while ($comment = Post::fetch($comments)) {
2002                         if (in_array($comment['verb'], [Activity::FOLLOW, Activity::TAG])) {
2003                                 Logger::info('participation messages are not relayed', ['item' => $comment['id']]);
2004                                 continue;
2005                         }
2006
2007                         if ($comment['author-network'] == Protocol::ACTIVITYPUB) {
2008                                 Logger::info('Comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
2009                                 continue;
2010                         }
2011
2012                         if ($comment['parent-author-network'] == Protocol::ACTIVITYPUB) {
2013                                 Logger::info('Comments to comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
2014                                 continue;
2015                         }
2016
2017                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $author_contact["cid"]]);
2018                         if (Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $author_contact["cid"])) {
2019                                 Post\DeliveryData::incrementQueueCount($comment['uri-id'], 1);
2020                         }
2021                 }
2022                 DBA::close($comments);
2023
2024                 return true;
2025         }
2026
2027         /**
2028          * Processes photos - unneeded
2029          *
2030          * @param array  $importer Array of the importer user
2031          * @param object $data     The message object
2032          *
2033          * @return bool always true
2034          */
2035         private static function receivePhoto(array $importer, $data)
2036         {
2037                 // There doesn't seem to be a reason for this function,
2038                 // since the photo data is transmitted in the status message as well
2039                 return true;
2040         }
2041
2042         /**
2043          * Processes poll participations - unssupported
2044          *
2045          * @param array  $importer Array of the importer user
2046          * @param object $data     The message object
2047          *
2048          * @return bool always true
2049          */
2050         private static function receivePollParticipation(array $importer, $data)
2051         {
2052                 // We don't support polls by now
2053                 return true;
2054         }
2055
2056         /**
2057          * Processes incoming profile updates
2058          *
2059          * @param array  $importer Array of the importer user
2060          * @param object $data     The message object
2061          *
2062          * @return bool Success
2063          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2064          * @throws \ImagickException
2065          */
2066         private static function receiveProfile(array $importer, $data)
2067         {
2068                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2069
2070                 $contact = self::contactByHandle($importer["uid"], $author);
2071                 if (!$contact) {
2072                         return false;
2073                 }
2074
2075                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2076                 $image_url = XML::unescape($data->image_url);
2077                 $birthday = XML::unescape($data->birthday);
2078                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2079                 $location = Markdown::toBBCode(XML::unescape($data->location));
2080                 $searchable = (XML::unescape($data->searchable) == "true");
2081                 $nsfw = (XML::unescape($data->nsfw) == "true");
2082                 $tags = XML::unescape($data->tag_string);
2083
2084                 $tags = explode("#", $tags);
2085
2086                 $keywords = [];
2087                 foreach ($tags as $tag) {
2088                         $tag = trim(strtolower($tag));
2089                         if ($tag != "") {
2090                                 $keywords[] = $tag;
2091                         }
2092                 }
2093
2094                 $keywords = implode(", ", $keywords);
2095
2096                 $handle_parts = explode("@", $author);
2097                 $nick = $handle_parts[0];
2098
2099                 if ($name === "") {
2100                         $name = $handle_parts[0];
2101                 }
2102
2103                 if (preg_match("|^https?://|", $image_url) === 0) {
2104                         $image_url = "http://".$handle_parts[1].$image_url;
2105                 }
2106
2107                 Contact::updateAvatar($contact["id"], $image_url);
2108
2109                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2110
2111                 $birthday = str_replace("1000", "1901", $birthday);
2112
2113                 if ($birthday != "") {
2114                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2115                 }
2116
2117                 // this is to prevent multiple birthday notifications in a single year
2118                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2119
2120                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2121                         $birthday = $contact["bd"];
2122                 }
2123
2124                 $fields = ['name' => $name, 'location' => $location,
2125                         'name-date' => DateTimeFormat::utcNow(), 'about' => $about,
2126                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2127                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2128
2129                 if (!empty($birthday)) {
2130                         $fields['bd'] = $birthday;
2131                 }
2132
2133                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2134
2135                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2136
2137                 return true;
2138         }
2139
2140         /**
2141          * Processes incoming friend requests
2142          *
2143          * @param array $importer Array of the importer user
2144          * @param array $contact  The contact that send the request
2145          * @return void
2146          * @throws \Exception
2147          */
2148         private static function receiveRequestMakeFriend(array $importer, array $contact)
2149         {
2150                 if ($contact["rel"] == Contact::SHARING) {
2151                         DBA::update(
2152                                 'contact',
2153                                 ['rel' => Contact::FRIEND, 'writable' => true],
2154                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2155                         );
2156                 }
2157         }
2158
2159         /**
2160          * Processes incoming sharing notification
2161          *
2162          * @param array  $importer Array of the importer user
2163          * @param object $data     The message object
2164          *
2165          * @return bool Success
2166          * @throws \Exception
2167          */
2168         private static function receiveContactRequest(array $importer, $data)
2169         {
2170                 $author = XML::unescape($data->author);
2171                 $recipient = XML::unescape($data->recipient);
2172
2173                 if (!$author || !$recipient) {
2174                         return false;
2175                 }
2176
2177                 // the current protocol version doesn't know these fields
2178                 // That means that we will assume their existance
2179                 if (isset($data->following)) {
2180                         $following = (XML::unescape($data->following) == "true");
2181                 } else {
2182                         $following = true;
2183                 }
2184
2185                 if (isset($data->sharing)) {
2186                         $sharing = (XML::unescape($data->sharing) == "true");
2187                 } else {
2188                         $sharing = true;
2189                 }
2190
2191                 $contact = self::contactByHandle($importer["uid"], $author);
2192
2193                 // perhaps we were already sharing with this person. Now they're sharing with us.
2194                 // That makes us friends.
2195                 if ($contact) {
2196                         if ($following) {
2197                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2198                                 self::receiveRequestMakeFriend($importer, $contact);
2199
2200                                 // refetch the contact array
2201                                 $contact = self::contactByHandle($importer["uid"], $author);
2202
2203                                 // If we are now friends, we are sending a share message.
2204                                 // Normally we needn't to do so, but the first message could have been vanished.
2205                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2206                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2207                                         if (DBA::isResult($user)) {
2208                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2209                                                 self::sendShare($user, $contact);
2210                                         }
2211                                 }
2212                                 return true;
2213                         } else {
2214                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2215                                 Contact::removeFollower($importer, $contact);
2216                                 return true;
2217                         }
2218                 }
2219
2220                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2221                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2222                         return false;
2223                 } elseif (!$following && !$sharing) {
2224                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2225                         return false;
2226                 } elseif (!$following && $sharing) {
2227                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2228                 } elseif ($following && $sharing) {
2229                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2230                 } elseif ($following && !$sharing) {
2231                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2232                 }
2233
2234                 $ret = FContact::getByURL($author);
2235
2236                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2237                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2238                         return false;
2239                 }
2240
2241                 $cid = Contact::getIdForURL($ret['url'], $importer['uid']);
2242                 if (!empty($cid)) {
2243                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
2244                 } else {
2245                         $contact = [];
2246                 }
2247
2248                 $item = ['author-id' => Contact::getIdForURL($ret['url']),
2249                         'author-link' => $ret['url']];
2250
2251                 $result = Contact::addRelationship($importer, $contact, $item, false);
2252                 if ($result === true) {
2253                         $contact_record = self::contactByHandle($importer['uid'], $author);
2254                         if (!$contact_record) {
2255                                 Logger::info('unable to locate newly created contact record.');
2256                                 return;
2257                         }
2258
2259                         $user = DBA::selectFirst('user', [], ['uid' => $importer['uid']]);
2260                         if (DBA::isResult($user)) {
2261                                 self::sendShare($user, $contact_record);
2262
2263                                 // Send the profile data, maybe it weren't transmitted before
2264                                 self::sendProfile($importer['uid'], [$contact_record]);
2265                         }
2266                 }
2267
2268                 return true;
2269         }
2270
2271         /**
2272          * Fetches a message with a given guid
2273          *
2274          * @param string $guid        message guid
2275          * @param string $orig_author handle of the original post
2276          * @return array The fetched item
2277          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2278          * @throws \ImagickException
2279          */
2280         public static function originalItem($guid, $orig_author)
2281         {
2282                 if (empty($guid)) {
2283                         Logger::log('Empty guid. Quitting.');
2284                         return false;
2285                 }
2286
2287                 // Do we already have this item?
2288                 $fields = ['body', 'title', 'app', 'created', 'object-type', 'uri', 'guid',
2289                         'author-name', 'author-link', 'author-avatar', 'plink', 'uri-id'];
2290                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2291                 $item = Post::selectFirst($fields, $condition);
2292
2293                 if (DBA::isResult($item)) {
2294                         Logger::log("reshared message ".$guid." already exists on system.");
2295
2296                         // Maybe it is already a reshared item?
2297                         // Then refetch the content, if it is a reshare from a reshare.
2298                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2299                         if (self::isReshare($item["body"], true)) {
2300                                 $item = [];
2301                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2302                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2303
2304                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2305
2306                                 return $item;
2307                         } else {
2308                                 return $item;
2309                         }
2310                 }
2311
2312                 if (!DBA::isResult($item)) {
2313                         if (empty($orig_author)) {
2314                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2315                                 return false;
2316                         }
2317
2318                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2319                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2320                         $stored = self::storeByGuid($guid, $server);
2321
2322                         if (!$stored) {
2323                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2324                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2325                                 $stored = self::storeByGuid($guid, $server);
2326                         }
2327
2328                         if ($stored) {
2329                                 $fields = ['body', 'title', 'app', 'created', 'object-type', 'uri', 'guid',
2330                                         'author-name', 'author-link', 'author-avatar', 'plink', 'uri-id'];
2331                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2332                                 $item = Post::selectFirst($fields, $condition);
2333
2334                                 if (DBA::isResult($item)) {
2335                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2336                                         if (self::isReshare($item["body"], false)) {
2337                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2338                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2339                                         }
2340
2341                                         return $item;
2342                                 }
2343                         }
2344                 }
2345                 return false;
2346         }
2347
2348         /**
2349          * Stores a reshare activity
2350          *
2351          * @param array   $item              Array of reshare post
2352          * @param integer $parent_message_id Id of the parent post
2353          * @param string  $guid              GUID string of reshare action
2354          * @param string  $author            Author handle
2355          */
2356         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2357         {
2358                 $parent = Post::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2359
2360                 $datarray = [];
2361
2362                 $datarray['uid'] = $item['uid'];
2363                 $datarray['contact-id'] = $item['contact-id'];
2364                 $datarray['network'] = $item['network'];
2365
2366                 $datarray['author-link'] = $item['author-link'];
2367                 $datarray['author-id'] = $item['author-id'];
2368
2369                 $datarray['owner-link'] = $datarray['author-link'];
2370                 $datarray['owner-id'] = $datarray['author-id'];
2371
2372                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2373                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2374                 $datarray['thr-parent'] = $parent['uri'];
2375
2376                 $datarray['verb'] = $datarray['body'] = Activity::ANNOUNCE;
2377                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2378                 $datarray['object-type'] = Activity\ObjectType::NOTE;
2379
2380                 $datarray['protocol'] = $item['protocol'];
2381                 $datarray['source'] = $item['source'];
2382                 $datarray['direction'] = $item['direction'];
2383
2384                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2385                 $datarray['private'] = $item['private'];
2386                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2387
2388                 if (Item::isTooOld($datarray)) {
2389                         Logger::info('Reshare activity is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
2390                         return false;
2391                 }
2392
2393                 $message_id = Item::insert($datarray);
2394
2395                 if ($message_id) {
2396                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2397                         if ($datarray['uid'] == 0) {
2398                                 Item::distribute($message_id);
2399                         }
2400                 }
2401         }
2402
2403         /**
2404          * Processes a reshare message
2405          *
2406          * @param array  $importer Array of the importer user
2407          * @param object $data     The message object
2408          * @param string $xml      The original XML of the message
2409          *
2410          * @return int the message id
2411          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2412          * @throws \ImagickException
2413          */
2414         private static function receiveReshare(array $importer, $data, $xml, bool $fetched)
2415         {
2416                 $author = Strings::escapeTags(XML::unescape($data->author));
2417                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2418                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2419                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2420                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2421                 /// @todo handle unprocessed property "provider_display_name"
2422                 $public = Strings::escapeTags(XML::unescape($data->public));
2423
2424                 $contact = self::allowedContactByHandle($importer, $author, false);
2425                 if (!$contact) {
2426                         return false;
2427                 }
2428
2429                 if (!empty($contact['gsid'])) {
2430                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::DIASPORA);
2431                 }
2432
2433                 $message_id = self::messageExists($importer["uid"], $guid);
2434                 if ($message_id) {
2435                         return true;
2436                 }
2437
2438                 $original_item = self::originalItem($root_guid, $root_author);
2439                 if (!$original_item) {
2440                         return false;
2441                 }
2442
2443                 if (empty($original_item['plink'])) {
2444                         $original_item['plink'] = self::plink($root_author, $root_guid);
2445                 }
2446
2447                 $datarray = [];
2448
2449                 $datarray["uid"] = $importer["uid"];
2450                 $datarray["contact-id"] = $contact["id"];
2451                 $datarray["network"]  = Protocol::DIASPORA;
2452
2453                 $datarray["author-link"] = $contact["url"];
2454                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2455
2456                 $datarray["owner-link"] = $datarray["author-link"];
2457                 $datarray["owner-id"] = $datarray["author-id"];
2458
2459                 $datarray["guid"] = $guid;
2460                 $datarray["uri"] = $datarray["thr-parent"] = self::getUriFromGuid($author, $guid);
2461                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2462
2463                 $datarray["verb"] = Activity::POST;
2464                 $datarray["gravity"] = GRAVITY_PARENT;
2465
2466                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2467                 $datarray["source"] = $xml;
2468                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
2469
2470                 /// @todo Copy tag data from original post
2471
2472                 $prefix = BBCode::getShareOpeningTag(
2473                         $original_item["author-name"],
2474                         $original_item["author-link"],
2475                         $original_item["author-avatar"],
2476                         $original_item["plink"],
2477                         $original_item["created"],
2478                         $original_item["guid"]
2479                 );
2480
2481                 if (!empty($original_item['title'])) {
2482                         $prefix .= '[h3]' . $original_item['title'] . "[/h3]\n";
2483                 }
2484
2485                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2486
2487                 Tag::storeFromBody($datarray['uri-id'], $datarray["body"]);
2488
2489                 $datarray["app"]  = $original_item["app"];
2490
2491                 $datarray["plink"] = self::plink($author, $guid);
2492                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2493                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2494
2495                 $datarray["object-type"] = $original_item["object-type"];
2496
2497                 self::fetchGuid($datarray);
2498
2499                 if (Item::isTooOld($datarray)) {
2500                         Logger::info('Reshare is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
2501                         return false;
2502                 }
2503
2504                 $message_id = Item::insert($datarray);
2505
2506                 self::sendParticipation($contact, $datarray);
2507
2508                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2509                 if ($root_message_id) {
2510                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2511                 }
2512
2513                 if ($message_id) {
2514                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2515                         if ($datarray['uid'] == 0) {
2516                                 Item::distribute($message_id);
2517                         }
2518                         return true;
2519                 } else {
2520                         return false;
2521                 }
2522         }
2523
2524         /**
2525          * Processes retractions
2526          *
2527          * @param array  $importer Array of the importer user
2528          * @param array  $contact  The contact of the item owner
2529          * @param object $data     The message object
2530          *
2531          * @return bool success
2532          * @throws \Exception
2533          */
2534         private static function itemRetraction(array $importer, array $contact, $data)
2535         {
2536                 $author = Strings::escapeTags(XML::unescape($data->author));
2537                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2538                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2539
2540                 $person = FContact::getByURL($author);
2541                 if (!is_array($person)) {
2542                         Logger::log("unable to find author detail for ".$author);
2543                         return false;
2544                 }
2545
2546                 if (empty($contact["url"])) {
2547                         $contact["url"] = $person["url"];
2548                 }
2549
2550                 // Fetch items that are about to be deleted
2551                 $fields = ['uid', 'id', 'parent', 'author-link', 'uri-id'];
2552
2553                 // When we receive a public retraction, we delete every item that we find.
2554                 if ($importer['uid'] == 0) {
2555                         $condition = ['guid' => $target_guid, 'deleted' => false];
2556                 } else {
2557                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2558                 }
2559
2560                 $r = Post::select($fields, $condition);
2561                 if (!DBA::isResult($r)) {
2562                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2563                         return false;
2564                 }
2565
2566                 while ($item = Post::fetch($r)) {
2567                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2568                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2569                                 continue;
2570                         }
2571
2572                         // Fetch the parent item
2573                         $parent = Post::selectFirst(['author-link'], ['id' => $item['parent']]);
2574
2575                         // Only delete it if the parent author really fits
2576                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2577                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2578                                 continue;
2579                         }
2580
2581                         Item::markForDeletion(['id' => $item['id']]);
2582
2583                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item['parent'], Logger::DEBUG);
2584                 }
2585                 DBA::close($r);
2586
2587                 return true;
2588         }
2589
2590         /**
2591          * Receives retraction messages
2592          *
2593          * @param array  $importer Array of the importer user
2594          * @param string $sender   The sender of the message
2595          * @param object $data     The message object
2596          *
2597          * @return bool Success
2598          * @throws \Exception
2599          */
2600         private static function receiveRetraction(array $importer, $sender, $data)
2601         {
2602                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2603
2604                 $contact = self::contactByHandle($importer["uid"], $sender);
2605                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2606                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2607                         return false;
2608                 }
2609
2610                 if (!$contact) {
2611                         $contact = [];
2612                 }
2613
2614                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2615
2616                 switch ($target_type) {
2617                         case "Comment":
2618                         case "Like":
2619                         case "Post":
2620                         case "Reshare":
2621                         case "StatusMessage":
2622                                 return self::itemRetraction($importer, $contact, $data);
2623
2624                         case "PollParticipation":
2625                         case "Photo":
2626                                 // Currently unsupported
2627                                 break;
2628
2629                         default:
2630                                 Logger::log("Unknown target type ".$target_type);
2631                                 return false;
2632                 }
2633                 return true;
2634         }
2635
2636         /**
2637          * Checks if an incoming message is wanted
2638          *
2639          * @param string $url
2640          * @param integer $uriid
2641          * @param string $author
2642          * @param string $body
2643          * @return boolean Is the message wanted?
2644          */
2645         private static function isSolicitedMessage(string $url, int $uriid, string $author, string $body)
2646         {
2647                 $contact = Contact::getByURL($author);
2648                 if (DBA::exists('contact', ["`nurl` = ? AND `uid` != ? AND `rel` IN (?, ?)",
2649                         $contact['nurl'], 0, Contact::FRIEND, Contact::SHARING])) {
2650                         Logger::info('Author has got followers - accepted', ['url' => $url, 'author' => $author]);
2651                         return true;
2652                 }
2653
2654                 $taglist = Tag::getByURIId($uriid, [Tag::HASHTAG]);
2655                 $tags = array_column($taglist, 'name');
2656                 return Relay::isSolicitedPost($tags, $body, $contact['id'], $url, Protocol::DIASPORA);
2657         }
2658
2659         /**
2660          * Store an attached photo in the post-media table
2661          *
2662          * @param int $uriid
2663          * @param object $photo
2664          * @return void
2665          */
2666         private static function storePhotoAsMedia(int $uriid, $photo)
2667         {
2668                 $data = [];
2669                 $data['uri-id'] = $uriid;
2670                 $data['type'] = Post\Media::IMAGE;
2671                 $data['url'] = XML::unescape($photo->remote_photo_path) . XML::unescape($photo->remote_photo_name);
2672                 $data['height'] = (int)XML::unescape($photo->height ?? 0);
2673                 $data['width'] = (int)XML::unescape($photo->width ?? 0);
2674                 $data['description'] = XML::unescape($photo->text ?? '');
2675
2676                 Post\Media::insert($data);
2677         }
2678
2679         /**
2680          * Receives status messages
2681          *
2682          * @param array            $importer Array of the importer user
2683          * @param SimpleXMLElement $data     The message object
2684          * @param string           $xml      The original XML of the message
2685          * @param bool             $fetched  The message had been fetched and not pushed
2686          * @return int The message id of the newly created item
2687          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2688          * @throws \ImagickException
2689          */
2690         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml, bool $fetched)
2691         {
2692                 $author = Strings::escapeTags(XML::unescape($data->author));
2693                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2694                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2695                 $public = Strings::escapeTags(XML::unescape($data->public));
2696                 $text = XML::unescape($data->text);
2697                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2698
2699                 $contact = self::allowedContactByHandle($importer, $author, false);
2700                 if (!$contact) {
2701                         return false;
2702                 }
2703
2704                 if (!empty($contact['gsid'])) {
2705                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::DIASPORA);
2706                 }
2707
2708                 $message_id = self::messageExists($importer["uid"], $guid);
2709                 if ($message_id) {
2710                         return true;
2711                 }
2712
2713                 $address = [];
2714                 if ($data->location) {
2715                         foreach ($data->location->children() as $fieldname => $data) {
2716                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2717                         }
2718                 }
2719
2720                 $raw_body = $body = Markdown::toBBCode($text);
2721
2722                 $datarray = [];
2723
2724                 $datarray["guid"] = $guid;
2725                 $datarray["uri"] = $datarray["thr-parent"] = self::getUriFromGuid($author, $guid);
2726                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2727
2728                 // Attach embedded pictures to the body
2729                 if ($data->photo) {
2730                         foreach ($data->photo as $photo) {
2731                                 self::storePhotoAsMedia($datarray['uri-id'], $photo);
2732                         }
2733
2734                         $datarray["object-type"] = Activity\ObjectType::IMAGE;
2735                         $datarray["post-type"] = Item::PT_IMAGE;
2736                 } else {
2737                         $datarray["object-type"] = Activity\ObjectType::NOTE;
2738                         $datarray["post-type"] = Item::PT_NOTE;
2739                 }
2740
2741                 /// @todo enable support for polls
2742                 //if ($data->poll) {
2743                 //      foreach ($data->poll AS $poll)
2744                 //              print_r($poll);
2745                 //      die("poll!\n");
2746                 //}
2747
2748                 /// @todo enable support for events
2749
2750                 $datarray["uid"] = $importer["uid"];
2751                 $datarray["contact-id"] = $contact["id"];
2752                 $datarray["network"] = Protocol::DIASPORA;
2753
2754                 $datarray["author-link"] = $contact["url"];
2755                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2756
2757                 $datarray["owner-link"] = $datarray["author-link"];
2758                 $datarray["owner-id"] = $datarray["author-id"];
2759
2760                 $datarray["verb"] = Activity::POST;
2761                 $datarray["gravity"] = GRAVITY_PARENT;
2762
2763                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2764                 $datarray["source"] = $xml;
2765                 $datarray["direction"] = $fetched ? Conversation::PULL : Conversation::PUSH;
2766
2767                 if ($fetched) {
2768                         $datarray["post-reason"] = Item::PR_FETCHED;
2769                 } elseif ($datarray["uid"] == 0) {
2770                         $datarray["post-reason"] = Item::PR_GLOBAL;
2771                 }
2772
2773                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2774                 $datarray["raw-body"] = self::replacePeopleGuid($raw_body, $contact["url"]);
2775
2776                 self::storeMentions($datarray['uri-id'], $text);
2777                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
2778
2779                 if (!$fetched && !self::isSolicitedMessage($datarray["uri"], $datarray['uri-id'], $author, $body)) {
2780                         DBA::delete('item-uri', ['uri' => $datarray['uri']]);
2781                         return false;
2782                 }
2783
2784                 if ($provider_display_name != "") {
2785                         $datarray["app"] = $provider_display_name;
2786                 }
2787
2788                 $datarray["plink"] = self::plink($author, $guid);
2789                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2790                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2791
2792                 if (isset($address["address"])) {
2793                         $datarray["location"] = $address["address"];
2794                 }
2795
2796                 if (isset($address["lat"]) && isset($address["lng"])) {
2797                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2798                 }
2799
2800                 self::fetchGuid($datarray);
2801
2802                 if (Item::isTooOld($datarray)) {
2803                         Logger::info('Status is too old', ['created' => $datarray['created'], 'uid' => $datarray['uid'], 'guid' => $datarray['guid']]);
2804                         return false;
2805                 }
2806
2807                 $message_id = Item::insert($datarray);
2808
2809                 self::sendParticipation($contact, $datarray);
2810
2811                 if ($message_id) {
2812                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2813                         if ($datarray['uid'] == 0) {
2814                                 Item::distribute($message_id);
2815                         }
2816                         return true;
2817                 } else {
2818                         return false;
2819                 }
2820         }
2821
2822         /* ************************************************************************************** *
2823          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2824          * ************************************************************************************** */
2825
2826         /**
2827          * returnes the handle of a contact
2828          *
2829          * @param array $contact contact array
2830          *
2831          * @return string the handle in the format user@domain.tld
2832          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2833          */
2834         private static function myHandle(array $contact)
2835         {
2836                 if (!empty($contact["addr"])) {
2837                         return $contact["addr"];
2838                 }
2839
2840                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2841                 // So - just in case - we build the the address here.
2842                 if ($contact["nickname"] != "") {
2843                         $nick = $contact["nickname"];
2844                 } else {
2845                         $nick = $contact["nick"];
2846                 }
2847
2848                 return $nick . "@" . substr(DI::baseUrl(), strpos(DI::baseUrl(), "://") + 3);
2849         }
2850
2851
2852         /**
2853          * Creates the data for a private message in the new format
2854          *
2855          * @param string $msg     The message that is to be transmitted
2856          * @param array  $user    The record of the sender
2857          * @param array  $contact Target of the communication
2858          * @param string $prvkey  The private key of the sender
2859          * @param string $pubkey  The public key of the receiver
2860          *
2861          * @return string The encrypted data
2862          * @throws \Exception
2863          */
2864         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2865         {
2866                 Logger::log("Message: ".$msg, Logger::DATA);
2867
2868                 // without a public key nothing will work
2869                 if (!$pubkey) {
2870                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
2871                         return false;
2872                 }
2873
2874                 $aes_key = random_bytes(32);
2875                 $b_aes_key = base64_encode($aes_key);
2876                 $iv = random_bytes(16);
2877                 $b_iv = base64_encode($iv);
2878
2879                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
2880
2881                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
2882
2883                 $encrypted_key_bundle = "";
2884                 if (!@openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey)) {
2885                         return false;
2886                 }
2887
2888                 $json_object = json_encode(
2889                         ["aes_key" => base64_encode($encrypted_key_bundle),
2890                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
2891                 );
2892
2893                 return $json_object;
2894         }
2895
2896         /**
2897          * Creates the envelope for the "fetch" endpoint and for the new format
2898          *
2899          * @param string $msg  The message that is to be transmitted
2900          * @param array  $user The record of the sender
2901          *
2902          * @return string The envelope
2903          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2904          */
2905         public static function buildMagicEnvelope($msg, array $user)
2906         {
2907                 $b64url_data = Strings::base64UrlEncode($msg);
2908                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
2909
2910                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
2911                 $type = "application/xml";
2912                 $encoding = "base64url";
2913                 $alg = "RSA-SHA256";
2914                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
2915
2916                 // Fallback if the private key wasn't transmitted in the expected field
2917                 if ($user['uprvkey'] == "") {
2918                         $user['uprvkey'] = $user['prvkey'];
2919                 }
2920
2921                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
2922                 $sig = Strings::base64UrlEncode($signature);
2923
2924                 $xmldata = ["me:env" => ["me:data" => $data,
2925                                                         "@attributes" => ["type" => $type],
2926                                                         "me:encoding" => $encoding,
2927                                                         "me:alg" => $alg,
2928                                                         "me:sig" => $sig,
2929                                                         "@attributes2" => ["key_id" => $key_id]]];
2930
2931                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
2932
2933                 return XML::fromArray($xmldata, $xml, false, $namespaces);
2934         }
2935
2936         /**
2937          * Create the envelope for a message
2938          *
2939          * @param string $msg     The message that is to be transmitted
2940          * @param array  $user    The record of the sender
2941          * @param array  $contact Target of the communication
2942          * @param string $prvkey  The private key of the sender
2943          * @param string $pubkey  The public key of the receiver
2944          * @param bool   $public  Is the message public?
2945          *
2946          * @return string The message that will be transmitted to other servers
2947          * @throws \Exception
2948          */
2949         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
2950         {
2951                 // The message is put into an envelope with the sender's signature
2952                 $envelope = self::buildMagicEnvelope($msg, $user);
2953
2954                 // Private messages are put into a second envelope, encrypted with the receivers public key
2955                 if (!$public) {
2956                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
2957                 }
2958
2959                 return $envelope;
2960         }
2961
2962         /**
2963          * Creates a signature for a message
2964          *
2965          * @param array $owner   the array of the owner of the message
2966          * @param array $message The message that is to be signed
2967          *
2968          * @return string The signature
2969          */
2970         private static function signature($owner, $message)
2971         {
2972                 $sigmsg = $message;
2973                 unset($sigmsg["author_signature"]);
2974                 unset($sigmsg["parent_author_signature"]);
2975
2976                 $signed_text = implode(";", $sigmsg);
2977
2978                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
2979         }
2980
2981         /**
2982          * Transmit a message to a target server
2983          *
2984          * @param array  $owner        the array of the item owner
2985          * @param array  $contact      Target of the communication
2986          * @param string $envelope     The message that is to be transmitted
2987          * @param bool   $public_batch Is it a public post?
2988          * @param string $guid         message guid
2989          *
2990          * @return int Result of the transmission
2991          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2992          * @throws \ImagickException
2993          */
2994         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
2995         {
2996                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
2997                 if (!$enabled) {
2998                         return 200;
2999                 }
3000
3001                 $logid = Strings::getRandomHex(4);
3002
3003                 // We always try to use the data from the fcontact table.
3004                 // This is important for transmitting data to Friendica servers.
3005                 if (!empty($contact['addr'])) {
3006                         $fcontact = FContact::getByURL($contact['addr']);
3007                         if (!empty($fcontact)) {
3008                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3009                         }
3010                 }
3011
3012                 if (empty($dest_url)) {
3013                         $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3014                 }
3015
3016                 if (!$dest_url) {
3017                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3018                         return 0;
3019                 }
3020
3021                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3022
3023                 if (!intval(DI::config()->get("system", "diaspora_test"))) {
3024                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3025
3026                         $postResult = DI::httpRequest()->post($dest_url . "/", $envelope, ["Content-Type: " . $content_type]);
3027                         $return_code = $postResult->getReturnCode();
3028                 } else {
3029                         Logger::log("test_mode");
3030                         return 200;
3031                 }
3032
3033                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3034
3035                 return $return_code ? $return_code : -1;
3036         }
3037
3038
3039         /**
3040          * Build the post xml
3041          *
3042          * @param string $type    The message type
3043          * @param array  $message The message data
3044          *
3045          * @return string The post XML
3046          */
3047         public static function buildPostXml($type, $message)
3048         {
3049                 $data = [$type => $message];
3050
3051                 return XML::fromArray($data, $xml);
3052         }
3053
3054         /**
3055          * Builds and transmit messages
3056          *
3057          * @param array  $owner        the array of the item owner
3058          * @param array  $contact      Target of the communication
3059          * @param string $type         The message type
3060          * @param array  $message      The message data
3061          * @param bool   $public_batch Is it a public post?
3062          * @param string $guid         message guid
3063          *
3064          * @return int Result of the transmission
3065          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3066          * @throws \ImagickException
3067          */
3068         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "")
3069         {
3070                 $msg = self::buildPostXml($type, $message);
3071
3072                 Logger::log('message: '.$msg, Logger::DATA);
3073                 Logger::log('send guid '.$guid, Logger::DEBUG);
3074
3075                 // Fallback if the private key wasn't transmitted in the expected field
3076                 if (empty($owner['uprvkey'])) {
3077                         $owner['uprvkey'] = $owner['prvkey'];
3078                 }
3079
3080                 // When sending content to Friendica contacts using the Diaspora protocol
3081                 // we have to fetch the public key from the fcontact.
3082                 // This is due to the fact that legacy DFRN had unique keys for every contact.
3083                 $pubkey = $contact['pubkey'];
3084                 if (!empty($contact['addr'])) {
3085                         $fcontact = FContact::getByURL($contact['addr']);
3086                         if (!empty($fcontact)) {
3087                                 $pubkey = $fcontact['pubkey'];
3088                         }
3089                 }
3090
3091                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
3092
3093                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3094
3095                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3096
3097                 return $return_code;
3098         }
3099
3100         /**
3101          * sends a participation (Used to get all further updates)
3102          *
3103          * @param array $contact Target of the communication
3104          * @param array $item    Item array
3105          *
3106          * @return int The result of the transmission
3107          * @throws \Exception
3108          */
3109         private static function sendParticipation(array $contact, array $item)
3110         {
3111                 // Don't send notifications for private postings
3112                 if ($item['private'] == Item::PRIVATE) {
3113                         return;
3114                 }
3115
3116                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3117
3118                 $result = DI::cache()->get($cachekey);
3119                 if (!is_null($result)) {
3120                         return;
3121                 }
3122
3123                 $owner = User::getOwnerDataById($item['uid']);
3124                 $author = self::myHandle($owner);
3125
3126                 $message = ["author" => $author,
3127                                 "guid" => System::createUUID(),
3128                                 "parent_type" => "Post",
3129                                 "parent_guid" => $item["guid"]];
3130
3131                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3132
3133                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3134                 DI::cache()->set($cachekey, $item["guid"], Duration::QUARTER_HOUR);
3135
3136                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3137         }
3138
3139         /**
3140          * sends an account migration
3141          *
3142          * @param array $owner   the array of the item owner
3143          * @param array $contact Target of the communication
3144          * @param int   $uid     User ID
3145          *
3146          * @return int The result of the transmission
3147          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3148          * @throws \ImagickException
3149          */
3150         public static function sendAccountMigration(array $owner, array $contact, $uid)
3151         {
3152                 $old_handle = DI::pConfig()->get($uid, 'system', 'previous_addr');
3153                 $profile = self::createProfileData($uid);
3154
3155                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3156                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3157
3158                 $message = ["author" => $old_handle,
3159                                 "profile" => $profile,
3160                                 "signature" => $signature];
3161
3162                 Logger::info('Send account migration', ['msg' => $message]);
3163
3164                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3165         }
3166
3167         /**
3168          * Sends a "share" message
3169          *
3170          * @param array $owner   the array of the item owner
3171          * @param array $contact Target of the communication
3172          *
3173          * @return int The result of the transmission
3174          * @throws \Exception
3175          */
3176         public static function sendShare(array $owner, array $contact)
3177         {
3178                 /**
3179                  * @todo support the different possible combinations of "following" and "sharing"
3180                  * Currently, Diaspora only interprets the "sharing" field
3181                  *
3182                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3183                  */
3184
3185                 /*
3186                 switch ($contact["rel"]) {
3187                         case Contact::FRIEND:
3188                                 $following = true;
3189                                 $sharing = true;
3190
3191                         case Contact::SHARING:
3192                                 $following = false;
3193                                 $sharing = true;
3194
3195                         case Contact::FOLLOWER:
3196                                 $following = true;
3197                                 $sharing = false;
3198                 }
3199                 */
3200
3201                 $message = ["author" => self::myHandle($owner),
3202                                 "recipient" => $contact["addr"],
3203                                 "following" => "true",
3204                                 "sharing" => "true"];
3205
3206                 Logger::info('Send share', ['msg' => $message]);
3207
3208                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3209         }
3210
3211         /**
3212          * sends an "unshare"
3213          *
3214          * @param array $owner   the array of the item owner
3215          * @param array $contact Target of the communication
3216          *
3217          * @return int The result of the transmission
3218          * @throws \Exception
3219          */
3220         public static function sendUnshare(array $owner, array $contact)
3221         {
3222                 $message = ["author" => self::myHandle($owner),
3223                                 "recipient" => $contact["addr"],
3224                                 "following" => "false",
3225                                 "sharing" => "false"];
3226
3227                 Logger::info('Send unshare', ['msg' => $message]);
3228
3229                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3230         }
3231
3232         /**
3233          * Checks a message body if it is a reshare
3234          *
3235          * @param string $body     The message body that is to be check
3236          * @param bool   $complete Should it be a complete check or a simple check?
3237          *
3238          * @return array|bool Reshare details or "false" if no reshare
3239          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3240          * @throws \ImagickException
3241          */
3242         public static function isReshare($body, $complete = true)
3243         {
3244                 $body = trim($body);
3245
3246                 $reshared = Item::getShareArray(['body' => $body]);
3247                 if (empty($reshared)) {
3248                         return false;
3249                 }
3250
3251                 // Skip if it isn't a pure repeated messages
3252                 // Does it start with a share?
3253                 if (!empty($reshared['comment']) && $complete) {
3254                         return false;
3255                 }
3256
3257                 if (!empty($reshared['guid']) && $complete) {
3258                         $condition = ['guid' => $reshared['guid'], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3259                         $item = Post::selectFirst(['contact-id'], $condition);
3260                         if (DBA::isResult($item)) {
3261                                 $ret = [];
3262                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3263                                 $ret["root_guid"] = $reshared['guid'];
3264                                 return $ret;
3265                         } elseif ($complete) {
3266                                 // We are resharing something that isn't a DFRN or Diaspora post.
3267                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3268                                 return false;
3269                         }
3270                 } elseif (empty($reshared['guid']) && $complete) {
3271                         return false;
3272                 }
3273
3274                 $ret = [];
3275
3276                 if (!empty($reshared['profile']) && ($cid = Contact::getIdForURL($reshared['profile']))) {
3277                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $cid]);
3278                         if (!empty($contact['addr'])) {
3279                                 $ret['root_handle'] = $contact['addr'];
3280                         }
3281                 }
3282
3283                 if (empty($ret) && !$complete) {
3284                         return true;
3285                 }
3286
3287                 return $ret;
3288         }
3289
3290         /**
3291          * Create an event array
3292          *
3293          * @param integer $event_id The id of the event
3294          *
3295          * @return array with event data
3296          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3297          */
3298         private static function buildEvent($event_id)
3299         {
3300                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3301                 if (!DBA::isResult($r)) {
3302                         return [];
3303                 }
3304
3305                 $event = $r[0];
3306
3307                 $eventdata = [];
3308
3309                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3310                 if (!DBA::isResult($r)) {
3311                         return [];
3312                 }
3313
3314                 $user = $r[0];
3315
3316                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3317                 if (!DBA::isResult($r)) {
3318                         return [];
3319                 }
3320
3321                 $owner = $r[0];
3322
3323                 $eventdata['author'] = self::myHandle($owner);
3324
3325                 if ($event['guid']) {
3326                         $eventdata['guid'] = $event['guid'];
3327                 }
3328
3329                 $mask = DateTimeFormat::ATOM;
3330
3331                 /// @todo - establish "all day" events in Friendica
3332                 $eventdata["all_day"] = "false";
3333
3334                 $eventdata['timezone'] = 'UTC';
3335                 if (!$event['adjust'] && $user['timezone']) {
3336                         $eventdata['timezone'] = $user['timezone'];
3337                 }
3338
3339                 if ($event['start']) {
3340                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3341                 }
3342                 if ($event['finish'] && !$event['nofinish']) {
3343                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3344                 }
3345                 if ($event['summary']) {
3346                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3347                 }
3348                 if ($event['desc']) {
3349                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3350                 }
3351                 if ($event['location']) {
3352                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3353                         $coord = Map::getCoordinates($event['location']);
3354
3355                         $location = [];
3356                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3357                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3358                                 $location["lat"] = $coord['lat'];
3359                                 $location["lng"] = $coord['lon'];
3360                         } else {
3361                                 $location["lat"] = 0;
3362                                 $location["lng"] = 0;
3363                         }
3364                         $eventdata['location'] = $location;
3365                 }
3366
3367                 return $eventdata;
3368         }
3369
3370         /**
3371          * Create a post (status message or reshare)
3372          *
3373          * @param array $item  The item that will be exported
3374          * @param array $owner the array of the item owner
3375          *
3376          * @return array
3377          * 'type' -> Message type ("status_message" or "reshare")
3378          * 'message' -> Array of XML elements of the status
3379          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3380          * @throws \ImagickException
3381          */
3382         public static function buildStatus(array $item, array $owner)
3383         {
3384                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3385
3386                 $result = DI::cache()->get($cachekey);
3387                 if (!is_null($result)) {
3388                         return $result;
3389                 }
3390
3391                 $myaddr = self::myHandle($owner);
3392
3393                 $public = ($item["private"] == Item::PRIVATE ? "false" : "true");
3394                 $created = DateTimeFormat::utc($item['received'], DateTimeFormat::ATOM);
3395                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3396
3397                 // Detect a share element and do a reshare
3398                 if (($item['private'] != Item::PRIVATE) && ($ret = self::isReshare($item["body"]))) {
3399                         $message = ["author" => $myaddr,
3400                                         "guid" => $item["guid"],
3401                                         "created_at" => $created,
3402                                         "root_author" => $ret["root_handle"],
3403                                         "root_guid" => $ret["root_guid"],
3404                                         "provider_display_name" => $item["app"],
3405                                         "public" => $public];
3406
3407                         $type = "reshare";
3408                 } else {
3409                         $title = $item["title"];
3410                         $body = Post\Media::addAttachmentsToBody($item['uri-id'], $item['body']);
3411
3412                         // Fetch the title from an attached link - if there is one
3413                         if (empty($item["title"]) && DI::pConfig()->get($owner['uid'], 'system', 'attach_link_title')) {
3414                                 $page_data = BBCode::getAttachmentData($item['body']);
3415                                 if (!empty($page_data['type']) && !empty($page_data['title']) && ($page_data['type'] == 'link')) {
3416                                         $title = $page_data['title'];
3417                                 }
3418                         }
3419
3420                         if ($item['author-link'] != $item['owner-link']) {
3421                                 $body = BBCode::getShareOpeningTag($item['author-name'], $item['author-link'], $item['author-avatar'],
3422                                         $item['plink'], $item['created']) . $body . '[/share]';
3423                         }
3424
3425                         // convert to markdown
3426                         $body = html_entity_decode(BBCode::toMarkdown($body));
3427
3428                         // Adding the title
3429                         if (strlen($title)) {
3430                                 $body = "### ".html_entity_decode($title)."\n\n".$body;
3431                         }
3432
3433                         $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]);
3434                         if (!empty($attachments)) {
3435                                 $body .= "\n".DI::l10n()->t("Attachments:")."\n";
3436                                 foreach ($attachments as $attachment) {
3437                                         $body .= "[" . $attachment['description'] . "](" . $attachment['url'] . ")\n";
3438                                 }
3439                         }
3440
3441                         $location = [];
3442
3443                         if ($item["location"] != "")
3444                                 $location["address"] = $item["location"];
3445
3446                         if ($item["coord"] != "") {
3447                                 $coord = explode(" ", $item["coord"]);
3448                                 $location["lat"] = $coord[0];
3449                                 $location["lng"] = $coord[1];
3450                         }
3451
3452                         $message = ["author" => $myaddr,
3453                                         "guid" => $item["guid"],
3454                                         "created_at" => $created,
3455                                         "edited_at" => $edited,
3456                                         "public" => $public,
3457                                         "text" => $body,
3458                                         "provider_display_name" => $item["app"],
3459                                         "location" => $location];
3460
3461                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3462                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3463                                 unset($message["location"]);
3464                         }
3465
3466                         if ($item['event-id'] > 0) {
3467                                 $event = self::buildEvent($item['event-id']);
3468                                 if (count($event)) {
3469                                         $message['event'] = $event;
3470
3471                                         if (!empty($event['location']['address']) &&
3472                                                 !empty($event['location']['lat']) &&
3473                                                 !empty($event['location']['lng'])) {
3474                                                 $message['location'] = $event['location'];
3475                                         }
3476
3477                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3478                                         // $message['text'] = '';
3479                                 }
3480                         }
3481
3482                         $type = "status_message";
3483                 }
3484
3485                 $msg = ["type" => $type, "message" => $message];
3486
3487                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
3488
3489                 return $msg;
3490         }
3491
3492         private static function prependParentAuthorMention($body, $profile_url)
3493         {
3494                 $profile = Contact::getByURL($profile_url, false, ['addr', 'name', 'contact-type']);
3495                 if (!empty($profile['addr'])
3496                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3497                         && !strstr($body, $profile['addr'])
3498                         && !strstr($body, $profile_url)
3499                 ) {
3500                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3501                 }
3502
3503                 return $body;
3504         }
3505
3506         /**
3507          * Sends a post
3508          *
3509          * @param array $item         The item that will be exported
3510          * @param array $owner        the array of the item owner
3511          * @param array $contact      Target of the communication
3512          * @param bool  $public_batch Is it a public post?
3513          *
3514          * @return int The result of the transmission
3515          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3516          * @throws \ImagickException
3517          */
3518         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3519         {
3520                 $status = self::buildStatus($item, $owner);
3521
3522                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3523         }
3524
3525         /**
3526          * Creates a "like" object
3527          *
3528          * @param array $item  The item that will be exported
3529          * @param array $owner the array of the item owner
3530          *
3531          * @return array The data for a "like"
3532          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3533          */
3534         private static function constructLike(array $item, array $owner)
3535         {
3536                 $parent = Post::selectFirst(['guid', 'uri', 'thr-parent'], ['uri' => $item["thr-parent"]]);
3537                 if (!DBA::isResult($parent)) {
3538                         return false;
3539                 }
3540
3541                 $target_type = ($parent["uri"] === $parent["thr-parent"] ? "Post" : "Comment");
3542                 $positive = null;
3543                 if ($item['verb'] === Activity::LIKE) {
3544                         $positive = "true";
3545                 } elseif ($item['verb'] === Activity::DISLIKE) {
3546                         $positive = "false";
3547                 }
3548
3549                 return(["author" => self::myHandle($owner),
3550                                 "guid" => $item["guid"],
3551                                 "parent_guid" => $parent["guid"],
3552                                 "parent_type" => $target_type,
3553                                 "positive" => $positive,
3554                                 "author_signature" => ""]);
3555         }
3556
3557         /**
3558          * Creates an "EventParticipation" object
3559          *
3560          * @param array $item  The item that will be exported
3561          * @param array $owner the array of the item owner
3562          *
3563          * @return array The data for an "EventParticipation"
3564          * @throws \Exception
3565          */
3566         private static function constructAttend(array $item, array $owner)
3567         {
3568                 $parent = Post::selectFirst(['guid'], ['uri' => $item['thr-parent']]);
3569                 if (!DBA::isResult($parent)) {
3570                         return false;
3571                 }
3572
3573                 switch ($item['verb']) {
3574                         case Activity::ATTEND:
3575                                 $attend_answer = 'accepted';
3576                                 break;
3577                         case Activity::ATTENDNO:
3578                                 $attend_answer = 'declined';
3579                                 break;
3580                         case Activity::ATTENDMAYBE:
3581                                 $attend_answer = 'tentative';
3582                                 break;
3583                         default:
3584                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3585                                 return false;
3586                 }
3587
3588                 return(["author" => self::myHandle($owner),
3589                                 "guid" => $item["guid"],
3590                                 "parent_guid" => $parent["guid"],
3591                                 "status" => $attend_answer,
3592                                 "author_signature" => ""]);
3593         }
3594
3595         /**
3596          * Creates the object for a comment
3597          *
3598          * @param array $item  The item that will be exported
3599          * @param array $owner the array of the item owner
3600          *
3601          * @return array|false The data for a comment
3602          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3603          */
3604         private static function constructComment(array $item, array $owner)
3605         {
3606                 $cachekey = "diaspora:constructComment:".$item['guid'];
3607
3608                 $result = DI::cache()->get($cachekey);
3609                 if (!is_null($result)) {
3610                         return $result;
3611                 }
3612
3613                 $toplevel_item = Post::selectFirst(['guid', 'author-id', 'author-link', 'gravity'], ['id' => $item['parent'], 'parent' => $item['parent']]);
3614                 if (!DBA::isResult($toplevel_item)) {
3615                         Logger::error('Missing parent conversation item', ['parent' => $item['parent']]);
3616                         return false;
3617                 }
3618
3619                 $thread_parent_item = $toplevel_item;
3620                 if ($item['thr-parent'] != $item['parent-uri']) {
3621                         $thread_parent_item = Post::selectFirst(['guid', 'author-id', 'author-link', 'gravity'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3622                 }
3623
3624                 $body = Post\Media::addAttachmentsToBody($item['uri-id'], $item['body']);
3625
3626                 // The replied to autor mention is prepended for clarity if:
3627                 // - Item replied isn't yours
3628                 // - Item is public or explicit mentions are disabled
3629                 // - Implicit mentions are enabled
3630                 if (
3631                         $item['author-id'] != $thread_parent_item['author-id']
3632                         && ($thread_parent_item['gravity'] != GRAVITY_PARENT)
3633                         && (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3634                         && !DI::config()->get('system', 'disable_implicit_mentions')
3635                 ) {
3636                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3637                 }
3638
3639                 $text = html_entity_decode(BBCode::toMarkdown($body));
3640                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3641                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3642
3643                 $comment = [
3644                         "author"      => self::myHandle($owner),
3645                         "guid"        => $item["guid"],
3646                         "created_at"  => $created,
3647                         "edited_at"   => $edited,
3648                         "parent_guid" => $toplevel_item["guid"],
3649                         "text"        => $text,
3650                         "author_signature" => ""
3651                 ];
3652
3653                 // Send the thread parent guid only if it is a threaded comment
3654                 if ($item['thr-parent'] != $item['parent-uri']) {
3655                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3656                 }
3657
3658                 DI::cache()->set($cachekey, $comment, Duration::QUARTER_HOUR);
3659
3660                 return($comment);
3661         }
3662
3663         /**
3664          * Send a like or a comment
3665          *
3666          * @param array $item         The item that will be exported
3667          * @param array $owner        the array of the item owner
3668          * @param array $contact      Target of the communication
3669          * @param bool  $public_batch Is it a public post?
3670          *
3671          * @return int The result of the transmission
3672          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3673          * @throws \ImagickException
3674          */
3675         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3676         {
3677                 if (in_array($item['verb'], [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE])) {
3678                         $message = self::constructAttend($item, $owner);
3679                         $type = "event_participation";
3680                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3681                         $message = self::constructLike($item, $owner);
3682                         $type = "like";
3683                 } elseif (!in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
3684                         $message = self::constructComment($item, $owner);
3685                         $type = "comment";
3686                 }
3687
3688                 if (empty($message)) {
3689                         return false;
3690                 }
3691
3692                 $message["author_signature"] = self::signature($owner, $message);
3693
3694                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3695         }
3696
3697         /**
3698          * Relays messages (like, comment, retraction) to other servers if we are the thread owner
3699          *
3700          * @param array $item         The item that will be exported
3701          * @param array $owner        the array of the item owner
3702          * @param array $contact      Target of the communication
3703          * @param bool  $public_batch Is it a public post?
3704          *
3705          * @return int The result of the transmission
3706          * @throws \Exception
3707          */
3708         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3709         {
3710                 if ($item["deleted"]) {
3711                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3712                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3713                         $type = "like";
3714                 } else {
3715                         $type = "comment";
3716                 }
3717
3718                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3719
3720                 $msg = json_decode($item['signed_text'], true);
3721
3722                 $message = [];
3723                 if (is_array($msg)) {
3724                         foreach ($msg as $field => $data) {
3725                                 if (!$item["deleted"]) {
3726                                         if ($field == "diaspora_handle") {
3727                                                 $field = "author";
3728                                         }
3729                                         if ($field == "target_type") {
3730                                                 $field = "parent_type";
3731                                         }
3732                                 }
3733
3734                                 $message[$field] = $data;
3735                         }
3736                 } else {
3737                         Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3738                 }
3739
3740                 $message["parent_author_signature"] = self::signature($owner, $message);
3741
3742                 Logger::info('Relayed data', ['msg' => $message]);
3743
3744                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3745         }
3746
3747         /**
3748          * Sends a retraction (deletion) of a message, like or comment
3749          *
3750          * @param array $item         The item that will be exported
3751          * @param array $owner        the array of the item owner
3752          * @param array $contact      Target of the communication
3753          * @param bool  $public_batch Is it a public post?
3754          * @param bool  $relay        Is the retraction transmitted from a relay?
3755          *
3756          * @return int The result of the transmission
3757          * @throws \Exception
3758          */
3759         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3760         {
3761                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3762
3763                 $msg_type = "retraction";
3764
3765                 if ($item['gravity'] == GRAVITY_PARENT) {
3766                         $target_type = "Post";
3767                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3768                         $target_type = "Like";
3769                 } else {
3770                         $target_type = "Comment";
3771                 }
3772
3773                 $message = ["author" => $itemaddr,
3774                                 "target_guid" => $item['guid'],
3775                                 "target_type" => $target_type];
3776
3777                 Logger::info('Got message', ['msg' => $message]);
3778
3779                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3780         }
3781
3782         /**
3783          * Sends a mail
3784          *
3785          * @param array $item    The item that will be exported
3786          * @param array $owner   The owner
3787          * @param array $contact Target of the communication
3788          *
3789          * @return int The result of the transmission
3790          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3791          * @throws \ImagickException
3792          */
3793         public static function sendMail(array $item, array $owner, array $contact)
3794         {
3795                 $myaddr = self::myHandle($owner);
3796
3797                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
3798                 if (!DBA::isResult($cnv)) {
3799                         Logger::log("conversation not found.");
3800                         return;
3801                 }
3802
3803                 $body = BBCode::toMarkdown($item["body"]);
3804                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3805
3806                 $msg = [
3807                         "author" => $myaddr,
3808                         "guid" => $item["guid"],
3809                         "conversation_guid" => $cnv["guid"],
3810                         "text" => $body,
3811                         "created_at" => $created,
3812                 ];
3813
3814                 if ($item["reply"]) {
3815                         $message = $msg;
3816                         $type = "message";
3817                 } else {
3818                         $message = [
3819                                 "author" => $cnv["creator"],
3820                                 "guid" => $cnv["guid"],
3821                                 "subject" => $cnv["subject"],
3822                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
3823                                 "participants" => $cnv["recips"],
3824                                 "message" => $msg
3825                         ];
3826
3827                         $type = "conversation";
3828                 }
3829
3830                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
3831         }
3832
3833         /**
3834          * Split a name into first name and last name
3835          *
3836          * @param string $name The name
3837          *
3838          * @return array The array with "first" and "last"
3839          */
3840         public static function splitName($name) {
3841                 $name = trim($name);
3842
3843                 // Is the name longer than 64 characters? Then cut the rest of it.
3844                 if (strlen($name) > 64) {
3845                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
3846                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
3847                         } else {
3848                                 $name = substr($name, 0, 64);
3849                         }
3850                 }
3851
3852                 // Take the first word as first name
3853                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
3854                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3855                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3856                         return ['first' => $first, 'last' => $last];
3857                 }
3858
3859                 // Take the last word as last name
3860                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
3861                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3862
3863                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3864                         return ['first' => $first, 'last' => $last];
3865                 }
3866
3867                 // Take the first 32 characters if there is no space in the first 32 characters
3868                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
3869                         $first = substr($name, 0, 32);
3870                         $last = substr($name, 32);
3871                         return ['first' => $first, 'last' => $last];
3872                 }
3873
3874                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
3875                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3876
3877                 // Check if the last name is longer than 32 characters
3878                 if (strlen($last) > 32) {
3879                         if (strpos($last, ' ') <= 32) {
3880                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
3881                         } else {
3882                                 $last = substr($last, 0, 32);
3883                         }
3884                 }
3885
3886                 return ['first' => $first, 'last' => $last];
3887         }
3888
3889         /**
3890          * Create profile data
3891          *
3892          * @param int $uid The user id
3893          *
3894          * @return array The profile data
3895          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3896          */
3897         private static function createProfileData($uid)
3898         {
3899                 $profile = DBA::selectFirst('owner-view', ['uid', 'addr', 'name', 'location', 'net-publish', 'dob', 'about', 'pub_keywords'], ['uid' => $uid]);
3900                 if (!DBA::isResult($profile)) {
3901                         return [];
3902                 }
3903
3904                 $handle = $profile["addr"];
3905
3906                 $split_name = self::splitName($profile['name']);
3907                 $first = $split_name['first'];
3908                 $last = $split_name['last'];
3909
3910                 $large = DI::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3911                 $medium = DI::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3912                 $small = DI::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3913                 $searchable = ($profile['net-publish'] ? 'true' : 'false');
3914
3915                 $dob = null;
3916                 $about = null;
3917                 $location = null;
3918                 $tags = null;
3919                 if ($searchable === 'true') {
3920                         $dob = '';
3921
3922                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
3923                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
3924                                 if ($year < 1004) {
3925                                         $year = 1004;
3926                                 }
3927                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
3928                         }
3929
3930                         $about = BBCode::toMarkdown($profile['about']);
3931
3932                         $location = $profile['location'];
3933                         $tags = '';
3934                         if ($profile['pub_keywords']) {
3935                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
3936                                 $kw = str_replace('  ', ' ', $kw);
3937                                 $arr = explode(' ', $kw);
3938                                 if (count($arr)) {
3939                                         for ($x = 0; $x < 5; $x ++) {
3940                                                 if (!empty($arr[$x])) {
3941                                                         $tags .= '#'. trim($arr[$x]) .' ';
3942                                                 }
3943                                         }
3944                                 }
3945                         }
3946                         $tags = trim($tags);
3947                 }
3948
3949                 return ["author" => $handle,
3950                                 "first_name" => $first,
3951                                 "last_name" => $last,
3952                                 "image_url" => $large,
3953                                 "image_url_medium" => $medium,
3954                                 "image_url_small" => $small,
3955                                 "birthday" => $dob,
3956                                 "bio" => $about,
3957                                 "location" => $location,
3958                                 "searchable" => $searchable,
3959                                 "nsfw" => "false",
3960                                 "tag_string" => $tags];
3961         }
3962
3963         /**
3964          * Sends profile data
3965          *
3966          * @param int  $uid    The user id
3967          * @param bool $recips optional, default false
3968          * @return void
3969          * @throws \Exception
3970          */
3971         public static function sendProfile($uid, $recips = false)
3972         {
3973                 if (!$uid) {
3974                         return;
3975                 }
3976
3977                 $owner = User::getOwnerDataById($uid);
3978                 if (!$owner) {
3979                         return;
3980                 }
3981
3982                 if (!$recips) {
3983                         $recips = q(
3984                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3985                                 AND `uid` = %d AND `rel` != %d",
3986                                 DBA::escape(Protocol::DIASPORA),
3987                                 intval($uid),
3988                                 intval(Contact::SHARING)
3989                         );
3990                 }
3991
3992                 if (!$recips) {
3993                         return;
3994                 }
3995
3996                 $message = self::createProfileData($uid);
3997
3998                 // @ToDo Split this into single worker jobs
3999                 foreach ($recips as $recip) {
4000                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4001                         self::buildAndTransmit($owner, $recip, "profile", $message);
4002                 }
4003         }
4004
4005         /**
4006          * Creates the signature for likes that are created on our system
4007          *
4008          * @param integer $uid  The user of that comment
4009          * @param array   $item Item array
4010          *
4011          * @return array Signed content
4012          * @throws \Exception
4013          */
4014         public static function createLikeSignature($uid, array $item)
4015         {
4016                 $owner = User::getOwnerDataById($uid);
4017                 if (empty($owner)) {
4018                         Logger::info('No owner post, so not storing signature');
4019                         return false;
4020                 }
4021
4022                 if (!in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4023                         return false;
4024                 }
4025
4026                 $message = self::constructLike($item, $owner);
4027                 if ($message === false) {
4028                         return false;
4029                 }
4030
4031                 $message["author_signature"] = self::signature($owner, $message);
4032
4033                 return $message;
4034         }
4035
4036         /**
4037          * Creates the signature for Comments that are created on our system
4038          *
4039          * @param integer $uid  The user of that comment
4040          * @param array   $item Item array
4041          *
4042          * @return array Signed content
4043          * @throws \Exception
4044          */
4045         public static function createCommentSignature($uid, array $item)
4046         {
4047                 $owner = User::getOwnerDataById($uid);
4048                 if (empty($owner)) {
4049                         Logger::info('No owner post, so not storing signature');
4050                         return false;
4051                 }
4052
4053                 // This is only needed for the automated tests
4054                 if (empty($owner['uprvkey'])) {
4055                         return false;
4056                 }
4057
4058                 $message = self::constructComment($item, $owner);
4059                 if ($message === false) {
4060                         return false;
4061                 }
4062
4063                 $message["author_signature"] = self::signature($owner, $message);
4064
4065                 return $message;
4066         }
4067 }