src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol;
  23
  24 use Friendica\Content\Feature;
  25 use Friendica\Content\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\GContact;
  37 use Friendica\Model\Item;
  38 use Friendica\Model\ItemDeliveryData;
  39 use Friendica\Model\Mail;
  40 use Friendica\Model\Profile;
  41 use Friendica\Model\User;
  42 use Friendica\Network\Probe;
  43 use Friendica\Util\Crypto;
  44 use Friendica\Util\DateTimeFormat;
  45 use Friendica\Util\Map;
  46 use Friendica\Util\Network;
  47 use Friendica\Util\Strings;
  48 use Friendica\Util\XML;
  49 use Friendica\Worker\Delivery;
  50 use SimpleXMLElement;
  51
  52 /**
  53  * This class contain functions to create and send Diaspora XML files
  54  */
  55 class Diaspora
  56 {
  57         /**
  58          * Mark the relay contact of the given contact for archival
  59          * This is called whenever there is a communication issue with the server.
  60          * It avoids sending stuff to servers who don't exist anymore.
  61          * The relay contact is a technical contact entry that exists once per server.
  62          *
  63          * @param array $contact of the relay contact
  64          */
  65         public static function markRelayForArchival(array $contact)
  66         {
  67                 if (!empty($contact['contact-type']) && ($contact['contact-type'] == Contact::TYPE_RELAY)) {
  68                         // This is already the relay contact, we don't need to fetch it
  69                         $relay_contact = $contact;
  70                 } elseif (empty($contact['baseurl'])) {
  71                         if (!empty($contact['batch'])) {
  72                                 $condition = ['uid' => 0, 'network' => Protocol::FEDERATED, 'batch' => $contact['batch'], 'contact-type' => Contact::TYPE_RELAY];
  73                                 $relay_contact = DBA::selectFirst('contact', [], $condition);
  74                         } else {
  75                                 return;
  76                         }
  77                 } else {
  78                         $relay_contact = self::getRelayContact($contact['baseurl'], []);
  79                 }
  80
  81                 if (!empty($relay_contact)) {
  82                         Logger::info('Relay contact will be marked for archival', ['id' => $relay_contact['id'], 'url' => $relay_contact['url']]);
  83                         Contact::markForArchival($relay_contact);
  84                 }
  85         }
  86
  87         /**
  88          * Return a list of relay servers
  89          *
  90          * The list contains not only the official relays but also servers that we serve directly
  91          *
  92          * @param integer $item_id  The id of the item that is sent
  93          * @param array   $contacts The previously fetched contacts
  94          *
  95          * @return array of relay servers
  96          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  97          */
  98         public static function relayList($item_id, array $contacts = [])
  99         {
 100                 $serverlist = [];
 101
 102                 // Fetching relay servers
 103                 $serverdata = DI::config()->get("system", "relay_server");
 104
 105                 if (!empty($serverdata)) {
 106                         $servers = explode(",", $serverdata);
 107                         foreach ($servers as $server) {
 108                                 $serverlist[$server] = trim($server);
 109                         }
 110                 }
 111
 112                 if (DI::config()->get("system", "relay_directly", false)) {
 113                         // We distribute our stuff based on the parent to ensure that the thread will be complete
 114                         $parent = Item::selectFirst(['parent'], ['id' => $item_id]);
 115                         if (!DBA::isResult($parent)) {
 116                                 return;
 117                         }
 118
 119                         // Servers that want to get all content
 120                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
 121                         while ($server = DBA::fetch($servers)) {
 122                                 $serverlist[$server['url']] = $server['url'];
 123                         }
 124
 125                         // All tags of the current post
 126                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
 127                         $tags = DBA::select('term', ['term'], $condition);
 128                         $taglist = [];
 129                         while ($tag = DBA::fetch($tags)) {
 130                                 $taglist[] = $tag['term'];
 131                         }
 132
 133                         // All servers who wants content with this tag
 134                         $tagserverlist = [];
 135                         if (!empty($taglist)) {
 136                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
 137                                 while ($server = DBA::fetch($tagserver)) {
 138                                         $tagserverlist[] = $server['gserver-id'];
 139                                 }
 140                         }
 141
 142                         // All adresses with the given id
 143                         if (!empty($tagserverlist)) {
 144                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 145                                 while ($server = DBA::fetch($servers)) {
 146                                         $serverlist[$server['url']] = $server['url'];
 147                                 }
 148                         }
 149                 }
 150
 151                 // Now we are collecting all relay contacts
 152                 foreach ($serverlist as $server_url) {
 153                         // We don't send messages to ourselves
 154                         if (Strings::compareLink($server_url, DI::baseUrl())) {
 155                                 continue;
 156                         }
 157                         $contact = self::getRelayContact($server_url);
 158                         if (is_bool($contact)) {
 159                                 continue;
 160                         }
 161
 162                         $exists = false;
 163                         foreach ($contacts as $entry) {
 164                                 if ($entry['batch'] == $contact['batch']) {
 165                                         $exists = true;
 166                                 }
 167                         }
 168
 169                         if (!$exists) {
 170                                 $contacts[] = $contact;
 171                         }
 172                 }
 173
 174                 return $contacts;
 175         }
 176
 177         /**
 178          * Return a contact for a given server address or creates a dummy entry
 179          *
 180          * @param string $server_url The url of the server
 181          * @param array $fields Fieldlist
 182          * @return array with the contact
 183          * @throws \Exception
 184          */
 185         private static function getRelayContact(string $server_url, array $fields = ['batch', 'id', 'url', 'name', 'network', 'protocol', 'archive', 'blocked'])
 186         {
 187                 // Fetch the relay contact
 188                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 189                         'contact-type' => Contact::TYPE_RELAY];
 190                 $contact = DBA::selectFirst('contact', $fields, $condition);
 191
 192                 if (DBA::isResult($contact)) {
 193                         if ($contact['archive'] || $contact['blocked']) {
 194                                 return false;
 195                         }
 196                         return $contact;
 197                 } else {
 198                         self::setRelayContact($server_url);
 199
 200                         $contact = DBA::selectFirst('contact', $fields, $condition);
 201                         if (DBA::isResult($contact)) {
 202                                 return $contact;
 203                         }
 204                 }
 205
 206                 // It should never happen that we arrive here
 207                 return [];
 208         }
 209
 210         /**
 211          * Update or insert a relay contact
 212          *
 213          * @param string $server_url     The url of the server
 214          * @param array  $network_fields Optional network specific fields
 215          * @throws \Exception
 216          */
 217         public static function setRelayContact($server_url, array $network_fields = [])
 218         {
 219                 $fields = ['created' => DateTimeFormat::utcNow(),
 220                         'name' => 'relay', 'nick' => 'relay', 'url' => $server_url,
 221                         'nurl' => Strings::normaliseLink($server_url),
 222                         'network' => Protocol::DIASPORA, 'uid' => 0,
 223                         'batch' => $server_url . '/receive/public',
 224                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 225                         'pending' => false, 'writable' => true,
 226                         'baseurl' => $server_url, 'contact-type' => Contact::TYPE_RELAY];
 227
 228                 $fields = array_merge($fields, $network_fields);
 229
 230                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url)];
 231                 $old = DBA::selectFirst('contact', [], $condition);
 232                 if (DBA::isResult($old)) {
 233                         unset($fields['created']);
 234                         $condition = ['id' => $old['id']];
 235
 236                         Logger::info('Update relay contact', ['fields' => $fields, 'condition' => $condition]);
 237                         DBA::update('contact', $fields, $condition, $old);
 238                 } else {
 239                         Logger::info('Create relay contact', ['fields' => $fields]);
 240                         Contact::insert($fields);
 241                 }
 242         }
 243
 244         /**
 245          * Return a list of participating contacts for a thread
 246          *
 247          * This is used for the participation feature.
 248          * One of the parameters is a contact array.
 249          * This is done to avoid duplicates.
 250          *
 251          * @param integer $thread   The id of the thread
 252          * @param array   $contacts The previously fetched contacts
 253          *
 254          * @return array of relay servers
 255          * @throws \Exception
 256          */
 257         public static function participantsForThread($thread, array $contacts)
 258         {
 259                 $r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`url`, `contact`.`name`, `contact`.`network`, `contact`.`protocol`,
 260                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 261                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 262                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 263                                 WHERE `participation`.`iid` = ? AND NOT `contact`.`archive`", $thread);
 264
 265                 while ($contact = DBA::fetch($r)) {
 266                         if (!empty($contact['fnetwork'])) {
 267                                 $contact['network'] = $contact['fnetwork'];
 268                         }
 269                         unset($contact['fnetwork']);
 270
 271                         if (empty($contact['protocol'])) {
 272                                 $contact['protocol'] = $contact['network'];
 273                         }
 274
 275                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 276                                 $contact['batch'] = $contact['fbatch'];
 277                         }
 278                         unset($contact['fbatch']);
 279
 280                         $exists = false;
 281                         foreach ($contacts as $entry) {
 282                                 if ($entry['batch'] == $contact['batch']) {
 283                                         $exists = true;
 284                                 }
 285                         }
 286
 287                         if (!$exists) {
 288                                 $contacts[] = $contact;
 289                         }
 290                 }
 291                 DBA::close($r);
 292
 293                 return $contacts;
 294         }
 295
 296         /**
 297          * repairs a signature that was double encoded
 298          *
 299          * The function is unused at the moment. It was copied from the old implementation.
 300          *
 301          * @param string  $signature The signature
 302          * @param string  $handle    The handle of the signature owner
 303          * @param integer $level     This value is only set inside this function to avoid endless loops
 304          *
 305          * @return string the repaired signature
 306          * @throws \Exception
 307          */
 308         private static function repairSignature($signature, $handle = "", $level = 1)
 309         {
 310                 if ($signature == "") {
 311                         return ($signature);
 312                 }
 313
 314                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 315                         $signature = base64_decode($signature);
 316                         Logger::log("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, Logger::DEBUG);
 317
 318                         // Do a recursive call to be able to fix even multiple levels
 319                         if ($level < 10) {
 320                                 $signature = self::repairSignature($signature, $handle, ++$level);
 321                         }
 322                 }
 323
 324                 return($signature);
 325         }
 326
 327         /**
 328          * verify the envelope and return the verified data
 329          *
 330          * @param string $envelope The magic envelope
 331          *
 332          * @return string verified data
 333          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 334          * @throws \ImagickException
 335          */
 336         private static function verifyMagicEnvelope($envelope)
 337         {
 338                 $basedom = XML::parseString($envelope);
 339
 340                 if (!is_object($basedom)) {
 341                         Logger::log("Envelope is no XML file");
 342                         return false;
 343                 }
 344
 345                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 346
 347                 if (sizeof($children) == 0) {
 348                         Logger::log("XML has no children");
 349                         return false;
 350                 }
 351
 352                 $handle = "";
 353
 354                 $data = Strings::base64UrlDecode($children->data);
 355                 $type = $children->data->attributes()->type[0];
 356
 357                 $encoding = $children->encoding;
 358
 359                 $alg = $children->alg;
 360
 361                 $sig = Strings::base64UrlDecode($children->sig);
 362                 $key_id = $children->sig->attributes()->key_id[0];
 363                 if ($key_id != "") {
 364                         $handle = Strings::base64UrlDecode($key_id);
 365                 }
 366
 367                 $b64url_data = Strings::base64UrlEncode($data);
 368                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 369
 370                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 371
 372                 if ($handle == '') {
 373                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 374                         return false;
 375                 }
 376
 377                 $key = self::key($handle);
 378                 if ($key == '') {
 379                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 380                         return false;
 381                 }
 382
 383                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 384                 if (!$verify) {
 385                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 386                         return false;
 387                 }
 388
 389                 return $data;
 390         }
 391
 392         /**
 393          * encrypts data via AES
 394          *
 395          * @param string $key  The AES key
 396          * @param string $iv   The IV (is used for CBC encoding)
 397          * @param string $data The data that is to be encrypted
 398          *
 399          * @return string encrypted data
 400          */
 401         private static function aesEncrypt($key, $iv, $data)
 402         {
 403                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 404         }
 405
 406         /**
 407          * decrypts data via AES
 408          *
 409          * @param string $key       The AES key
 410          * @param string $iv        The IV (is used for CBC encoding)
 411          * @param string $encrypted The encrypted data
 412          *
 413          * @return string decrypted data
 414          */
 415         private static function aesDecrypt($key, $iv, $encrypted)
 416         {
 417                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 418         }
 419
 420         /**
 421          * Decodes incoming Diaspora message in the new format
 422          *
 423          * @param string  $raw      raw post message
 424          * @param string  $privKey   The private key of the importer
 425          * @param boolean $no_exit  Don't do an http exit on error
 426          *
 427          * @return array
 428          * 'message' -> decoded Diaspora XML message
 429          * 'author' -> author diaspora handle
 430          * 'key' -> author public key (converted to pkcs#8)
 431          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 432          * @throws \ImagickException
 433          */
 434         public static function decodeRaw(string $raw, string $privKey = '', bool $no_exit = false)
 435         {
 436                 $data = json_decode($raw);
 437
 438                 // Is it a private post? Then decrypt the outer Salmon
 439                 if (is_object($data)) {
 440                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 441                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 442
 443                         $outer_key_bundle = '';
 444                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 445                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 446
 447                         if (!is_object($j_outer_key_bundle)) {
 448                                 Logger::log('Outer Salmon did not verify. Discarding.');
 449                                 if ($no_exit) {
 450                                         return false;
 451                                 } else {
 452                                         throw new \Friendica\Network\HTTPException\BadRequestException();
 453                                 }
 454                         }
 455
 456                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 457                         $outer_key = base64_decode($j_outer_key_bundle->key);
 458
 459                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 460                 } else {
 461                         $xml = $raw;
 462                 }
 463
 464                 $basedom = XML::parseString($xml);
 465
 466                 if (!is_object($basedom)) {
 467                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 468                         if ($no_exit) {
 469                                 return false;
 470                         } else {
 471                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 472                         }
 473                 }
 474
 475                 $base = $basedom->children(ActivityNamespace::SALMON_ME);
 476
 477                 // Not sure if this cleaning is needed
 478                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 479
 480                 // Build the signed data
 481                 $type = $base->data[0]->attributes()->type[0];
 482                 $encoding = $base->encoding;
 483                 $alg = $base->alg;
 484                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 485
 486                 // This is the signature
 487                 $signature = Strings::base64UrlDecode($base->sig);
 488
 489                 // Get the senders' public key
 490                 $key_id = $base->sig[0]->attributes()->key_id[0];
 491                 $author_addr = base64_decode($key_id);
 492                 if ($author_addr == '') {
 493                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 494                         if ($no_exit) {
 495                                 return false;
 496                         } else {
 497                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 498                         }
 499                 }
 500
 501                 $key = self::key($author_addr);
 502                 if ($key == '') {
 503                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 504                         if ($no_exit) {
 505                                 return false;
 506                         } else {
 507                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 508                         }
 509                 }
 510
 511                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 512                 if (!$verify) {
 513                         Logger::log('Message did not verify. Discarding.');
 514                         if ($no_exit) {
 515                                 return false;
 516                         } else {
 517                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 518                         }
 519                 }
 520
 521                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 522                                 'author' => XML::unescape($author_addr),
 523                                 'key' => (string)$key];
 524         }
 525
 526         /**
 527          * Decodes incoming Diaspora message in the deprecated format
 528          *
 529          * @param string $xml      urldecoded Diaspora salmon
 530          * @param string $privKey  The private key of the importer
 531          *
 532          * @return array
 533          * 'message' -> decoded Diaspora XML message
 534          * 'author' -> author diaspora handle
 535          * 'key' -> author public key (converted to pkcs#8)
 536          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 537          * @throws \ImagickException
 538          */
 539         public static function decode(string $xml, string $privKey = '')
 540         {
 541                 $public = false;
 542                 $basedom = XML::parseString($xml);
 543
 544                 if (!is_object($basedom)) {
 545                         Logger::log("XML is not parseable.");
 546                         return false;
 547                 }
 548                 $children = $basedom->children('https://joindiaspora.com/protocol');
 549
 550                 $inner_aes_key = null;
 551                 $inner_iv = null;
 552
 553                 if ($children->header) {
 554                         $public = true;
 555                         $author_link = str_replace('acct:', '', $children->header->author_id);
 556                 } else {
 557                         // This happens with posts from a relais
 558                         if (empty($privKey)) {
 559                                 Logger::log("This is no private post in the old format", Logger::DEBUG);
 560                                 return false;
 561                         }
 562
 563                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 564
 565                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 566                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 567
 568                         $outer_key_bundle = '';
 569                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 570
 571                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 572
 573                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 574                         $outer_key = base64_decode($j_outer_key_bundle->key);
 575
 576                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 577
 578                         Logger::log('decrypted: '.$decrypted, Logger::DEBUG);
 579                         $idom = XML::parseString($decrypted);
 580
 581                         $inner_iv = base64_decode($idom->iv);
 582                         $inner_aes_key = base64_decode($idom->aes_key);
 583
 584                         $author_link = str_replace('acct:', '', $idom->author_id);
 585                 }
 586
 587                 $dom = $basedom->children(ActivityNamespace::SALMON_ME);
 588
 589                 // figure out where in the DOM tree our data is hiding
 590
 591                 $base = null;
 592                 if ($dom->provenance->data) {
 593                         $base = $dom->provenance;
 594                 } elseif ($dom->env->data) {
 595                         $base = $dom->env;
 596                 } elseif ($dom->data) {
 597                         $base = $dom;
 598                 }
 599
 600                 if (!$base) {
 601                         Logger::log('unable to locate salmon data in xml');
 602                         throw new \Friendica\Network\HTTPException\BadRequestException();
 603                 }
 604
 605
 606                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 607                 $signature = Strings::base64UrlDecode($base->sig);
 608
 609                 // unpack the  data
 610
 611                 // strip whitespace so our data element will return to one big base64 blob
 612                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 613
 614
 615                 // stash away some other stuff for later
 616
 617                 $type = $base->data[0]->attributes()->type[0];
 618                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 619                 $encoding = $base->encoding;
 620                 $alg = $base->alg;
 621
 622
 623                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 624
 625
 626                 // decode the data
 627                 $data = Strings::base64UrlDecode($data);
 628
 629
 630                 if ($public) {
 631                         $inner_decrypted = $data;
 632                 } else {
 633                         // Decode the encrypted blob
 634                         $inner_encrypted = base64_decode($data);
 635                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 636                 }
 637
 638                 if (!$author_link) {
 639                         Logger::log('Could not retrieve author URI.');
 640                         throw new \Friendica\Network\HTTPException\BadRequestException();
 641                 }
 642                 // Once we have the author URI, go to the web and try to find their public key
 643                 // (first this will look it up locally if it is in the fcontact cache)
 644                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 645
 646                 Logger::log('Fetching key for '.$author_link);
 647                 $key = self::key($author_link);
 648
 649                 if (!$key) {
 650                         Logger::log('Could not retrieve author key.');
 651                         throw new \Friendica\Network\HTTPException\BadRequestException();
 652                 }
 653
 654                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 655
 656                 if (!$verify) {
 657                         Logger::log('Message did not verify. Discarding.');
 658                         throw new \Friendica\Network\HTTPException\BadRequestException();
 659                 }
 660
 661                 Logger::log('Message verified.');
 662
 663                 return ['message' => (string)$inner_decrypted,
 664                                 'author' => XML::unescape($author_link),
 665                                 'key' => (string)$key];
 666         }
 667
 668
 669         /**
 670          * Dispatches public messages and find the fitting receivers
 671          *
 672          * @param array $msg The post that will be dispatched
 673          *
 674          * @return int The message id of the generated message, "true" or "false" if there was an error
 675          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 676          * @throws \ImagickException
 677          */
 678         public static function dispatchPublic($msg)
 679         {
 680                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
 681                 if (!$enabled) {
 682                         Logger::log("diaspora is disabled");
 683                         return false;
 684                 }
 685
 686                 if (!($fields = self::validPosting($msg))) {
 687                         Logger::log("Invalid posting");
 688                         return false;
 689                 }
 690
 691                 $importer = ["uid" => 0, "page-flags" => User::PAGE_FLAGS_FREELOVE];
 692                 $success = self::dispatch($importer, $msg, $fields);
 693
 694                 return $success;
 695         }
 696
 697         /**
 698          * Dispatches the different message types to the different functions
 699          *
 700          * @param array            $importer Array of the importer user
 701          * @param array            $msg      The post that will be dispatched
 702          * @param SimpleXMLElement $fields   SimpleXML object that contains the message
 703          *
 704          * @return int The message id of the generated message, "true" or "false" if there was an error
 705          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 706          * @throws \ImagickException
 707          */
 708         public static function dispatch(array $importer, $msg, SimpleXMLElement $fields = null)
 709         {
 710                 // The sender is the handle of the contact that sent the message.
 711                 // This will often be different with relayed messages (for example "like" and "comment")
 712                 $sender = $msg["author"];
 713
 714                 // This is only needed for private postings since this is already done for public ones before
 715                 if (is_null($fields)) {
 716                         $private = true;
 717                         if (!($fields = self::validPosting($msg))) {
 718                                 Logger::log("Invalid posting");
 719                                 return false;
 720                         }
 721                 } else {
 722                         $private = false;
 723                 }
 724
 725                 $type = $fields->getName();
 726
 727                 Logger::log("Received message type ".$type." from ".$sender." for user ".$importer["uid"], Logger::DEBUG);
 728
 729                 switch ($type) {
 730                         case "account_migration":
 731                                 if (!$private) {
 732                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 733                                         return false;
 734                                 }
 735                                 return self::receiveAccountMigration($importer, $fields);
 736
 737                         case "account_deletion":
 738                                 return self::receiveAccountDeletion($fields);
 739
 740                         case "comment":
 741                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 742
 743                         case "contact":
 744                                 if (!$private) {
 745                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 746                                         return false;
 747                                 }
 748                                 return self::receiveContactRequest($importer, $fields);
 749
 750                         case "conversation":
 751                                 if (!$private) {
 752                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 753                                         return false;
 754                                 }
 755                                 return self::receiveConversation($importer, $msg, $fields);
 756
 757                         case "like":
 758                                 return self::receiveLike($importer, $sender, $fields);
 759
 760                         case "message":
 761                                 if (!$private) {
 762                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 763                                         return false;
 764                                 }
 765                                 return self::receiveMessage($importer, $fields);
 766
 767                         case "participation":
 768                                 if (!$private) {
 769                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 770                                         return false;
 771                                 }
 772                                 return self::receiveParticipation($importer, $fields);
 773
 774                         case "photo": // Not implemented
 775                                 return self::receivePhoto($importer, $fields);
 776
 777                         case "poll_participation": // Not implemented
 778                                 return self::receivePollParticipation($importer, $fields);
 779
 780                         case "profile":
 781                                 if (!$private) {
 782                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 783                                         return false;
 784                                 }
 785                                 return self::receiveProfile($importer, $fields);
 786
 787                         case "reshare":
 788                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 789
 790                         case "retraction":
 791                                 return self::receiveRetraction($importer, $sender, $fields);
 792
 793                         case "status_message":
 794                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 795
 796                         default:
 797                                 Logger::log("Unknown message type ".$type);
 798                                 return false;
 799                 }
 800         }
 801
 802         /**
 803          * Checks if a posting is valid and fetches the data fields.
 804          *
 805          * This function does not only check the signature.
 806          * It also does the conversion between the old and the new diaspora format.
 807          *
 808          * @param array $msg Array with the XML, the sender handle and the sender signature
 809          *
 810          * @return bool|SimpleXMLElement If the posting is valid then an array with an SimpleXML object is returned
 811          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 812          * @throws \ImagickException
 813          */
 814         private static function validPosting($msg)
 815         {
 816                 $data = XML::parseString($msg["message"]);
 817
 818                 if (!is_object($data)) {
 819                         Logger::log("No valid XML ".$msg["message"], Logger::DEBUG);
 820                         return false;
 821                 }
 822
 823                 // Is this the new or the old version?
 824                 if ($data->getName() == "XML") {
 825                         $oldXML = true;
 826                         foreach ($data->post->children() as $child) {
 827                                 $element = $child;
 828                         }
 829                 } else {
 830                         $oldXML = false;
 831                         $element = $data;
 832                 }
 833
 834                 $type = $element->getName();
 835                 $orig_type = $type;
 836
 837                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 838
 839                 // All retractions are handled identically from now on.
 840                 // In the new version there will only be "retraction".
 841                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 842                         $type = "retraction";
 843
 844                 if ($type == "request") {
 845                         $type = "contact";
 846                 }
 847
 848                 $fields = new SimpleXMLElement("<".$type."/>");
 849
 850                 $signed_data = "";
 851                 $author_signature = null;
 852                 $parent_author_signature = null;
 853
 854                 foreach ($element->children() as $fieldname => $entry) {
 855                         if ($oldXML) {
 856                                 // Translation for the old XML structure
 857                                 if ($fieldname == "diaspora_handle") {
 858                                         $fieldname = "author";
 859                                 }
 860                                 if ($fieldname == "participant_handles") {
 861                                         $fieldname = "participants";
 862                                 }
 863                                 if (in_array($type, ["like", "participation"])) {
 864                                         if ($fieldname == "target_type") {
 865                                                 $fieldname = "parent_type";
 866                                         }
 867                                 }
 868                                 if ($fieldname == "sender_handle") {
 869                                         $fieldname = "author";
 870                                 }
 871                                 if ($fieldname == "recipient_handle") {
 872                                         $fieldname = "recipient";
 873                                 }
 874                                 if ($fieldname == "root_diaspora_id") {
 875                                         $fieldname = "root_author";
 876                                 }
 877                                 if ($type == "status_message") {
 878                                         if ($fieldname == "raw_message") {
 879                                                 $fieldname = "text";
 880                                         }
 881                                 }
 882                                 if ($type == "retraction") {
 883                                         if ($fieldname == "post_guid") {
 884                                                 $fieldname = "target_guid";
 885                                         }
 886                                         if ($fieldname == "type") {
 887                                                 $fieldname = "target_type";
 888                                         }
 889                                 }
 890                         }
 891
 892                         if (($fieldname == "author_signature") && ($entry != "")) {
 893                                 $author_signature = base64_decode($entry);
 894                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 895                                 $parent_author_signature = base64_decode($entry);
 896                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 897                                 if ($signed_data != "") {
 898                                         $signed_data .= ";";
 899                                 }
 900
 901                                 $signed_data .= $entry;
 902                         }
 903                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 904                                 || ($orig_type == "relayable_retraction")
 905                         ) {
 906                                 XML::copy($entry, $fields, $fieldname);
 907                         }
 908                 }
 909
 910                 // This is something that shouldn't happen at all.
 911                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 912                         if ($msg["author"] != $fields->author) {
 913                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 914                                 return false;
 915                         }
 916                 }
 917
 918                 // Only some message types have signatures. So we quit here for the other types.
 919                 if (!in_array($type, ["comment", "like"])) {
 920                         return $fields;
 921                 }
 922                 // No author_signature? This is a must, so we quit.
 923                 if (!isset($author_signature)) {
 924                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 925                         return false;
 926                 }
 927
 928                 if (isset($parent_author_signature)) {
 929                         $key = self::key($msg["author"]);
 930                         if (empty($key)) {
 931                                 Logger::log("No key found for parent author ".$msg["author"], Logger::DEBUG);
 932                                 return false;
 933                         }
 934
 935                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 936                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 937                                 return false;
 938                         }
 939                 }
 940
 941                 $key = self::key($fields->author);
 942                 if (empty($key)) {
 943                         Logger::log("No key found for author ".$fields->author, Logger::DEBUG);
 944                         return false;
 945                 }
 946
 947                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 948                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 949                         return false;
 950                 } else {
 951                         return $fields;
 952                 }
 953         }
 954
 955         /**
 956          * Fetches the public key for a given handle
 957          *
 958          * @param string $handle The handle
 959          *
 960          * @return string The public key
 961          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 962          * @throws \ImagickException
 963          */
 964         private static function key($handle)
 965         {
 966                 $handle = strval($handle);
 967
 968                 Logger::log("Fetching diaspora key for: ".$handle);
 969
 970                 $r = self::personByHandle($handle);
 971                 if ($r) {
 972                         return $r["pubkey"];
 973                 }
 974
 975                 return "";
 976         }
 977
 978         /**
 979          * Fetches data for a given handle
 980          *
 981          * @param string $handle The handle
 982          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
 983          *
 984          * @return array the queried data
 985          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 986          * @throws \ImagickException
 987          */
 988         public static function personByHandle($handle, $update = null)
 989         {
 990                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 991                 if (!DBA::isResult($person)) {
 992                         $urls = [$handle, str_replace('http://', 'https://', $handle), Strings::normaliseLink($handle)];
 993                         $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'url' => $urls]);
 994                 }
 995
 996                 if (DBA::isResult($person)) {
 997                         Logger::debug("In cache " . print_r($person, true));
 998
 999                         if (is_null($update)) {
1000                                 // update record occasionally so it doesn't get stale
1001                                 $d = strtotime($person["updated"]." +00:00");
1002                                 if ($d < strtotime("now - 14 days")) {
1003                                         $update = true;
1004                                 }
1005
1006                                 if ($person["guid"] == "") {
1007                                         $update = true;
1008                                 }
1009                         }
1010                 } elseif (is_null($update)) {
1011                         $update = !DBA::isResult($person);
1012                 } else {
1013                         $person = [];
1014                 }
1015
1016                 if ($update) {
1017                         Logger::log("create or refresh", Logger::DEBUG);
1018                         $r = Probe::uri($handle, Protocol::DIASPORA);
1019
1020                         // Note that Friendica contacts will return a "Diaspora person"
1021                         // if Diaspora connectivity is enabled on their server
1022                         if ($r && ($r["network"] === Protocol::DIASPORA)) {
1023                                 self::updateFContact($r);
1024
1025                                 $person = self::personByHandle($handle, false);
1026                         }
1027                 }
1028
1029                 return $person;
1030         }
1031
1032         /**
1033          * Updates the fcontact table
1034          *
1035          * @param array $arr The fcontact data
1036          * @throws \Exception
1037          */
1038         private static function updateFContact($arr)
1039         {
1040                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
1041                         'request' => $arr["request"], 'nick' => $arr["nick"],
1042                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
1043                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
1044                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
1045                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
1046                         'updated' => DateTimeFormat::utcNow()];
1047
1048                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
1049
1050                 DBA::update('fcontact', $fields, $condition, true);
1051         }
1052
1053         /**
1054          * get a handle (user@domain.tld) from a given contact id
1055          *
1056          * @param int $contact_id  The id in the contact table
1057          * @param int $pcontact_id The id in the contact table (Used for the public contact)
1058          *
1059          * @return string the handle
1060          * @throws \Exception
1061          */
1062         private static function handleFromContact($contact_id, $pcontact_id = 0)
1063         {
1064                 $handle = false;
1065
1066                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
1067
1068                 if ($pcontact_id != 0) {
1069                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
1070
1071                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
1072                                 return strtolower($contact["addr"]);
1073                         }
1074                 }
1075
1076                 $r = q(
1077                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1078                         intval($contact_id)
1079                 );
1080
1081                 if (DBA::isResult($r)) {
1082                         $contact = $r[0];
1083
1084                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
1085
1086                         if ($contact['addr'] != "") {
1087                                 $handle = $contact['addr'];
1088                         } else {
1089                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1090                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1091                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1092                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1093                                 $handle = $contact['nick'].'@'.$baseurl;
1094                         }
1095                 }
1096
1097                 return strtolower($handle);
1098         }
1099
1100         /**
1101          * get a url (scheme://domain.tld/u/user) from a given Diaspora*
1102          * fcontact guid
1103          *
1104          * @param mixed $fcontact_guid Hexadecimal string guid
1105          *
1106          * @return string the contact url or null
1107          * @throws \Exception
1108          */
1109         public static function urlFromContactGuid($fcontact_guid)
1110         {
1111                 Logger::log("fcontact guid is ".$fcontact_guid, Logger::DEBUG);
1112
1113                 $r = q(
1114                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1115                         DBA::escape(Protocol::DIASPORA),
1116                         DBA::escape($fcontact_guid)
1117                 );
1118
1119                 if (DBA::isResult($r)) {
1120                         return $r[0]['url'];
1121                 }
1122
1123                 return null;
1124         }
1125
1126         /**
1127          * Get a contact id for a given handle
1128          *
1129          * @todo  Move to Friendica\Model\Contact
1130          *
1131          * @param int    $uid    The user id
1132          * @param string $handle The handle in the format user@domain.tld
1133          *
1134          * @return array Contact data
1135          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1136          * @throws \ImagickException
1137          */
1138         private static function contactByHandle($uid, $handle)
1139         {
1140                 $cid = Contact::getIdForURL($handle, $uid);
1141                 if (!$cid) {
1142                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1143                         return false;
1144                 }
1145
1146                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1147                 if (!DBA::isResult($contact)) {
1148                         // This here shouldn't happen at all
1149                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1150                         return false;
1151                 }
1152
1153                 return $contact;
1154         }
1155
1156         /**
1157          * Checks if the given contact url does support ActivityPub
1158          *
1159          * @param string  $url    profile url
1160          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
1161          * @return boolean
1162          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1163          * @throws \ImagickException
1164          */
1165         public static function isSupportedByContactUrl($url, $update = null)
1166         {
1167                 return !empty(self::personByHandle($url, $update));
1168         }
1169
1170         /**
1171          * Check if posting is allowed for this contact
1172          *
1173          * @param array $importer   Array of the importer user
1174          * @param array $contact    The contact that is checked
1175          * @param bool  $is_comment Is the check for a comment?
1176          *
1177          * @return bool is the contact allowed to post?
1178          */
1179         private static function postAllow(array $importer, array $contact, $is_comment = false)
1180         {
1181                 /*
1182                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1183                  * That makes us friends.
1184                  * Normally this should have handled by getting a request - but this could get lost
1185                  */
1186                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1187                 // It is not removed by now. Possibly the code is needed?
1188                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(User::PAGE_FLAGS_FREELOVE))) {
1189                 //      DBA::update(
1190                 //              'contact',
1191                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1192                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1193                 //      );
1194                 //
1195                 //      $contact["rel"] = Contact::FRIEND;
1196                 //      Logger::log("defining user ".$contact["nick"]." as friend");
1197                 //}
1198
1199                 // Contact server is blocked
1200                 if (Network::isUrlBlocked($contact['url'])) {
1201                         return false;
1202                         // We don't seem to like that person
1203                 } elseif ($contact["blocked"]) {
1204                         // Maybe blocked, don't accept.
1205                         return false;
1206                         // We are following this person?
1207                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1208                         // Yes, then it is fine.
1209                         return true;
1210                         // Is it a post to a community?
1211                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
1212                         // That's good
1213                         return true;
1214                         // Is the message a global user or a comment?
1215                 } elseif (($importer["uid"] == 0) || $is_comment) {
1216                         // Messages for the global users and comments are always accepted
1217                         return true;
1218                 }
1219
1220                 return false;
1221         }
1222
1223         /**
1224          * Fetches the contact id for a handle and checks if posting is allowed
1225          *
1226          * @param array  $importer   Array of the importer user
1227          * @param string $handle     The checked handle in the format user@domain.tld
1228          * @param bool   $is_comment Is the check for a comment?
1229          *
1230          * @return array The contact data
1231          * @throws \Exception
1232          */
1233         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
1234         {
1235                 $contact = self::contactByHandle($importer["uid"], $handle);
1236                 if (!$contact) {
1237                         Logger::log("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1238                         // If a contact isn't found, we accept it anyway if it is a comment
1239                         if ($is_comment && ($importer["uid"] != 0)) {
1240                                 return self::contactByHandle(0, $handle);
1241                         } elseif ($is_comment) {
1242                                 return $importer;
1243                         } else {
1244                                 return false;
1245                         }
1246                 }
1247
1248                 if (!self::postAllow($importer, $contact, $is_comment)) {
1249                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1250                         return false;
1251                 }
1252                 return $contact;
1253         }
1254
1255         /**
1256          * Does the message already exists on the system?
1257          *
1258          * @param int    $uid  The user id
1259          * @param string $guid The guid of the message
1260          *
1261          * @return int|bool message id if the message already was stored into the system - or false.
1262          * @throws \Exception
1263          */
1264         private static function messageExists($uid, $guid)
1265         {
1266                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1267                 if (DBA::isResult($item)) {
1268                         Logger::log("message ".$guid." already exists for user ".$uid);
1269                         return $item["id"];
1270                 }
1271
1272                 return false;
1273         }
1274
1275         /**
1276          * Checks for links to posts in a message
1277          *
1278          * @param array $item The item array
1279          * @return void
1280          */
1281         private static function fetchGuid(array $item)
1282         {
1283                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1284                 preg_replace_callback(
1285                         $expression,
1286                         function ($match) use ($item) {
1287                                 self::fetchGuidSub($match, $item);
1288                         },
1289                         $item["body"]
1290                 );
1291
1292                 preg_replace_callback(
1293                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1294                         function ($match) use ($item) {
1295                                 self::fetchGuidSub($match, $item);
1296                         },
1297                         $item["body"]
1298                 );
1299         }
1300
1301         /**
1302          * Checks for relative /people/* links in an item body to match local
1303          * contacts or prepends the remote host taken from the author link.
1304          *
1305          * @param string $body        The item body to replace links from
1306          * @param string $author_link The author link for missing local contact fallback
1307          *
1308          * @return string the replaced string
1309          */
1310         public static function replacePeopleGuid($body, $author_link)
1311         {
1312                 $return = preg_replace_callback(
1313                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1314                         function ($match) use ($author_link) {
1315                                 // $match
1316                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1317                                 // 1 => '0123456789abcdef'
1318                                 // 2 => 'Foo Bar'
1319                                 $handle = self::urlFromContactGuid($match[1]);
1320
1321                                 if ($handle) {
1322                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1323                                 } else {
1324                                         // No local match, restoring absolute remote URL from author scheme and host
1325                                         $author_url = parse_url($author_link);
1326                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1327                                 }
1328
1329                                 return $return;
1330                         },
1331                         $body
1332                 );
1333
1334                 return $return;
1335         }
1336
1337         /**
1338          * sub function of "fetchGuid" which checks for links in messages
1339          *
1340          * @param array $match array containing a link that has to be checked for a message link
1341          * @param array $item  The item array
1342          * @return void
1343          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1344          * @throws \ImagickException
1345          */
1346         private static function fetchGuidSub($match, $item)
1347         {
1348                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1349                         self::storeByGuid($match[1], $item["owner-link"]);
1350                 }
1351         }
1352
1353         /**
1354          * Fetches an item with a given guid from a given server
1355          *
1356          * @param string $guid   the message guid
1357          * @param string $server The server address
1358          * @param int    $uid    The user id of the user
1359          *
1360          * @return int the message id of the stored message or false
1361          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1362          * @throws \ImagickException
1363          */
1364         private static function storeByGuid($guid, $server, $uid = 0)
1365         {
1366                 $serverparts = parse_url($server);
1367
1368                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1369                         return false;
1370                 }
1371
1372                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1373
1374                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1375
1376                 $msg = self::message($guid, $server);
1377
1378                 if (!$msg) {
1379                         return false;
1380                 }
1381
1382                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1383
1384                 // Now call the dispatcher
1385                 return self::dispatchPublic($msg);
1386         }
1387
1388         /**
1389          * Fetches a message from a server
1390          *
1391          * @param string $guid   message guid
1392          * @param string $server The url of the server
1393          * @param int    $level  Endless loop prevention
1394          *
1395          * @return array
1396          *      'message' => The message XML
1397          *      'author' => The author handle
1398          *      'key' => The public key of the author
1399          * @throws \Exception
1400          */
1401         private static function message($guid, $server, $level = 0)
1402         {
1403                 if ($level > 5) {
1404                         return false;
1405                 }
1406
1407                 // This will work for new Diaspora servers and Friendica servers from 3.5
1408                 $source_url = $server."/fetch/post/".urlencode($guid);
1409
1410                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1411
1412                 $envelope = Network::fetchUrl($source_url);
1413                 if ($envelope) {
1414                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1415                         $x = self::verifyMagicEnvelope($envelope);
1416                         if (!$x) {
1417                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1418                         } else {
1419                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1420                         }
1421                 } else {
1422                         $x = false;
1423                 }
1424
1425                 if (!$x) {
1426                         return false;
1427                 }
1428
1429                 $source_xml = XML::parseString($x);
1430
1431                 if (!is_object($source_xml)) {
1432                         return false;
1433                 }
1434
1435                 if ($source_xml->post->reshare) {
1436                         // Reshare of a reshare - old Diaspora version
1437                         Logger::log("Message is a reshare", Logger::DEBUG);
1438                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1439                 } elseif ($source_xml->getName() == "reshare") {
1440                         // Reshare of a reshare - new Diaspora version
1441                         Logger::log("Message is a new reshare", Logger::DEBUG);
1442                         return self::message($source_xml->root_guid, $server, ++$level);
1443                 }
1444
1445                 $author = "";
1446
1447                 // Fetch the author - for the old and the new Diaspora version
1448                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1449                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1450                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1451                         $author = (string)$source_xml->author;
1452                 }
1453
1454                 // If this isn't a "status_message" then quit
1455                 if (!$author) {
1456                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1457                         return false;
1458                 }
1459
1460                 $msg = ["message" => $x, "author" => $author];
1461
1462                 $msg["key"] = self::key($msg["author"]);
1463
1464                 return $msg;
1465         }
1466
1467         /**
1468          * Fetches an item with a given URL
1469          *
1470          * @param string $url the message url
1471          *
1472          * @return int the message id of the stored message or false
1473          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1474          * @throws \ImagickException
1475          */
1476         public static function fetchByURL($url, $uid = 0)
1477         {
1478                 // Check for Diaspora (and Friendica) typical paths
1479                 if (!preg_match("=(https?://.+)/(?:posts|display)/([a-zA-Z0-9-_@.:%]+[a-zA-Z0-9])=i", $url, $matches)) {
1480                         return false;
1481                 }
1482
1483                 $guid = urldecode($matches[2]);
1484
1485                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1486                 if (DBA::isResult($item)) {
1487                         return $item['id'];
1488                 }
1489
1490                 self::storeByGuid($guid, $matches[1], $uid);
1491
1492                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1493                 if (DBA::isResult($item)) {
1494                         return $item['id'];
1495                 } else {
1496                         return false;
1497                 }
1498         }
1499
1500         /**
1501          * Fetches the item record of a given guid
1502          *
1503          * @param int    $uid     The user id
1504          * @param string $guid    message guid
1505          * @param string $author  The handle of the item
1506          * @param array  $contact The contact of the item owner
1507          *
1508          * @return array the item record
1509          * @throws \Exception
1510          */
1511         private static function parentItem($uid, $guid, $author, array $contact)
1512         {
1513                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1514                         'author-name', 'author-link', 'author-avatar',
1515                         'owner-name', 'owner-link', 'owner-avatar'];
1516                 $condition = ['uid' => $uid, 'guid' => $guid];
1517                 $item = Item::selectFirst($fields, $condition);
1518
1519                 if (!DBA::isResult($item)) {
1520                         $person = self::personByHandle($author);
1521                         $result = self::storeByGuid($guid, $person["url"], $uid);
1522
1523                         // We don't have an url for items that arrived at the public dispatcher
1524                         if (!$result && !empty($contact["url"])) {
1525                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1526                         }
1527
1528                         if ($result) {
1529                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1530
1531                                 $item = Item::selectFirst($fields, $condition);
1532                         }
1533                 }
1534
1535                 if (!DBA::isResult($item)) {
1536                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1537                         return false;
1538                 } else {
1539                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1540                         return $item;
1541                 }
1542         }
1543
1544         /**
1545          * returns contact details
1546          *
1547          * @param array $def_contact The default contact if the person isn't found
1548          * @param array $person      The record of the person
1549          * @param int   $uid         The user id
1550          *
1551          * @return array
1552          *      'cid' => contact id
1553          *      'network' => network type
1554          * @throws \Exception
1555          */
1556         private static function authorContactByUrl($def_contact, $person, $uid)
1557         {
1558                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1559                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1560                 if (DBA::isResult($contact)) {
1561                         $cid = $contact["id"];
1562                         $network = $contact["network"];
1563                 } else {
1564                         $cid = $def_contact["id"];
1565                         $network = Protocol::DIASPORA;
1566                 }
1567
1568                 return ["cid" => $cid, "network" => $network];
1569         }
1570
1571         /**
1572          * Is the profile a hubzilla profile?
1573          *
1574          * @param string $url The profile link
1575          *
1576          * @return bool is it a hubzilla server?
1577          */
1578         public static function isRedmatrix($url)
1579         {
1580                 return(strstr($url, "/channel/"));
1581         }
1582
1583         /**
1584          * Generate a post link with a given handle and message guid
1585          *
1586          * @param string $addr        The user handle
1587          * @param string $guid        message guid
1588          * @param string $parent_guid optional parent guid
1589          *
1590          * @return string the post link
1591          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1592          * @throws \ImagickException
1593          */
1594         private static function plink($addr, $guid, $parent_guid = '')
1595         {
1596                 $contact = Contact::getDetailsByAddr($addr);
1597
1598                 // Fallback
1599                 if (!$contact) {
1600                         if ($parent_guid != '') {
1601                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1602                         } else {
1603                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1604                         }
1605                 }
1606
1607                 if ($contact["network"] == Protocol::DFRN) {
1608                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1609                 }
1610
1611                 if (self::isRedmatrix($contact["url"])) {
1612                         return $contact["url"] . "/?mid=" . $guid;
1613                 }
1614
1615                 if ($parent_guid != '') {
1616                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1617                 } else {
1618                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1619                 }
1620         }
1621
1622         /**
1623          * Receives account migration
1624          *
1625          * @param array  $importer Array of the importer user
1626          * @param object $data     The message object
1627          *
1628          * @return bool Success
1629          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1630          * @throws \ImagickException
1631          */
1632         private static function receiveAccountMigration(array $importer, $data)
1633         {
1634                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1635                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1636                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1637
1638                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1639                 if (!$contact) {
1640                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1641                         return false;
1642                 }
1643
1644                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1645
1646                 // Check signature
1647                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1648                 $key = self::key($old_handle);
1649                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1650                         Logger::log('No valid signature for migration.');
1651                         return false;
1652                 }
1653
1654                 // Update the profile
1655                 self::receiveProfile($importer, $data->profile);
1656
1657                 // change the technical stuff in contact and gcontact
1658                 $data = Probe::uri($new_handle);
1659                 if ($data['network'] == Protocol::PHANTOM) {
1660                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1661                         return false;
1662                 }
1663
1664                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1665                                 'name' => $data['name'], 'nick' => $data['nick'],
1666                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1667                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1668                                 'network' => $data['network']];
1669
1670                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1671
1672                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1673                                 'name' => $data['name'], 'nick' => $data['nick'],
1674                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1675                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1676                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1677
1678                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1679
1680                 Logger::log('Contacts are updated.');
1681
1682                 return true;
1683         }
1684
1685         /**
1686          * Processes an account deletion
1687          *
1688          * @param object $data The message object
1689          *
1690          * @return bool Success
1691          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1692          */
1693         private static function receiveAccountDeletion($data)
1694         {
1695                 $author = Strings::escapeTags(XML::unescape($data->author));
1696
1697                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1698                 while ($contact = DBA::fetch($contacts)) {
1699                         Contact::remove($contact["id"]);
1700                 }
1701
1702                 DBA::delete('gcontact', ['addr' => $author]);
1703
1704                 Logger::log('Removed contacts for ' . $author);
1705
1706                 return true;
1707         }
1708
1709         /**
1710          * Fetch the uri from our database if we already have this item (maybe from ourselves)
1711          *
1712          * @param string  $author    Author handle
1713          * @param string  $guid      Message guid
1714          * @param boolean $onlyfound Only return uri when found in the database
1715          *
1716          * @return string The constructed uri or the one from our database
1717          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1718          * @throws \ImagickException
1719          */
1720         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1721         {
1722                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1723                 if (DBA::isResult($item)) {
1724                         return $item["uri"];
1725                 } elseif (!$onlyfound) {
1726                         $person = self::personByHandle($author);
1727
1728                         $parts = parse_url($person['url']);
1729                         unset($parts['path']);
1730                         $host_url = Network::unparseURL($parts);
1731
1732                         return $host_url . '/objects/' . $guid;
1733                 }
1734
1735                 return "";
1736         }
1737
1738         /**
1739          * Fetch the guid from our database with a given uri
1740          *
1741          * @param string $uri Message uri
1742          * @param string $uid Author handle
1743          *
1744          * @return string The post guid
1745          * @throws \Exception
1746          */
1747         private static function getGuidFromUri($uri, $uid)
1748         {
1749                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1750                 if (DBA::isResult($item)) {
1751                         return $item["guid"];
1752                 } else {
1753                         return false;
1754                 }
1755         }
1756
1757         /**
1758          * Find the best importer for a comment, like, ...
1759          *
1760          * @param string $guid The guid of the item
1761          *
1762          * @return array|boolean the origin owner of that post - or false
1763          * @throws \Exception
1764          */
1765         private static function importerForGuid($guid)
1766         {
1767                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1768                 if (DBA::isResult($item)) {
1769                         Logger::log("Found user ".$item['uid']." as owner of item ".$guid, Logger::DEBUG);
1770                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1771                         if (DBA::isResult($contact)) {
1772                                 return $contact;
1773                         }
1774                 }
1775                 return false;
1776         }
1777
1778         /**
1779          * Processes an incoming comment
1780          *
1781          * @param array  $importer Array of the importer user
1782          * @param string $sender   The sender of the message
1783          * @param object $data     The message object
1784          * @param string $xml      The original XML of the message
1785          *
1786          * @return int The message id of the generated comment or "false" if there was an error
1787          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1788          * @throws \ImagickException
1789          */
1790         private static function receiveComment(array $importer, $sender, $data, $xml)
1791         {
1792                 $author = Strings::escapeTags(XML::unescape($data->author));
1793                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1794                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1795                 $text = XML::unescape($data->text);
1796
1797                 if (isset($data->created_at)) {
1798                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1799                 } else {
1800                         $created_at = DateTimeFormat::utcNow();
1801                 }
1802
1803                 if (isset($data->thread_parent_guid)) {
1804                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1805                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1806                 } else {
1807                         $thr_uri = "";
1808                 }
1809
1810                 $contact = self::allowedContactByHandle($importer, $sender, true);
1811                 if (!$contact) {
1812                         return false;
1813                 }
1814
1815                 $message_id = self::messageExists($importer["uid"], $guid);
1816                 if ($message_id) {
1817                         return true;
1818                 }
1819
1820                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1821                 if (!$parent_item) {
1822                         return false;
1823                 }
1824
1825                 $person = self::personByHandle($author);
1826                 if (!is_array($person)) {
1827                         Logger::log("unable to find author details");
1828                         return false;
1829                 }
1830
1831                 // Fetch the contact id - if we know this contact
1832                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1833
1834                 $datarray = [];
1835
1836                 $datarray["uid"] = $importer["uid"];
1837                 $datarray["contact-id"] = $author_contact["cid"];
1838                 $datarray["network"]  = $author_contact["network"];
1839
1840                 $datarray["author-link"] = $person["url"];
1841                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1842
1843                 $datarray["owner-link"] = $contact["url"];
1844                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1845
1846                 $datarray["guid"] = $guid;
1847                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1848
1849                 $datarray["verb"] = Activity::POST;
1850                 $datarray["gravity"] = GRAVITY_COMMENT;
1851
1852                 if ($thr_uri != "") {
1853                         $datarray["parent-uri"] = $thr_uri;
1854                 } else {
1855                         $datarray["parent-uri"] = $parent_item["uri"];
1856                 }
1857
1858                 $datarray["object-type"] = Activity\ObjectType::COMMENT;
1859
1860                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1861                 $datarray["source"] = $xml;
1862
1863                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1864
1865                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1866
1867                 $body = Markdown::toBBCode($text);
1868
1869                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1870
1871                 self::fetchGuid($datarray);
1872
1873                 // If we are the origin of the parent we store the original data.
1874                 // We notify our followers during the item storage.
1875                 if ($parent_item["origin"]) {
1876                         $datarray['diaspora_signed_text'] = json_encode($data);
1877                 }
1878
1879                 $message_id = Item::insert($datarray);
1880
1881                 if ($message_id <= 0) {
1882                         return false;
1883                 }
1884
1885                 if ($message_id) {
1886                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1887                         if ($datarray['uid'] == 0) {
1888                                 Item::distribute($message_id, json_encode($data));
1889                         }
1890                 }
1891
1892                 return true;
1893         }
1894
1895         /**
1896          * processes and stores private messages
1897          *
1898          * @param array  $importer     Array of the importer user
1899          * @param array  $contact      The contact of the message
1900          * @param object $data         The message object
1901          * @param array  $msg          Array of the processed message, author handle and key
1902          * @param object $mesg         The private message
1903          * @param array  $conversation The conversation record to which this message belongs
1904          *
1905          * @return bool "true" if it was successful
1906          * @throws \Exception
1907          */
1908         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1909         {
1910                 $author = Strings::escapeTags(XML::unescape($data->author));
1911                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1912                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1913
1914                 // "diaspora_handle" is the element name from the old version
1915                 // "author" is the element name from the new version
1916                 if ($mesg->author) {
1917                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1918                 } elseif ($mesg->diaspora_handle) {
1919                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1920                 } else {
1921                         return false;
1922                 }
1923
1924                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1925                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1926                 $msg_text = XML::unescape($mesg->text);
1927                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1928
1929                 if ($msg_conversation_guid != $guid) {
1930                         Logger::log("message conversation guid does not belong to the current conversation.");
1931                         return false;
1932                 }
1933
1934                 $body = Markdown::toBBCode($msg_text);
1935                 $message_uri = $msg_author.":".$msg_guid;
1936
1937                 $person = self::personByHandle($msg_author);
1938
1939                 return Mail::insert([
1940                         'uid'        => $importer['uid'],
1941                         'guid'       => $msg_guid,
1942                         'convid'     => $conversation['id'],
1943                         'from-name'  => $person['name'],
1944                         'from-photo' => $person['photo'],
1945                         'from-url'   => $person['url'],
1946                         'contact-id' => $contact['id'],
1947                         'title'      => $subject,
1948                         'body'       => $body,
1949                         'uri'        => $message_uri,
1950                         'parent-uri' => $author . ':' . $guid,
1951                         'created'    => $msg_created_at
1952                 ]);
1953         }
1954
1955         /**
1956          * Processes new private messages (answers to private messages are processed elsewhere)
1957          *
1958          * @param array  $importer Array of the importer user
1959          * @param array  $msg      Array of the processed message, author handle and key
1960          * @param object $data     The message object
1961          *
1962          * @return bool Success
1963          * @throws \Exception
1964          */
1965         private static function receiveConversation(array $importer, $msg, $data)
1966         {
1967                 $author = Strings::escapeTags(XML::unescape($data->author));
1968                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1969                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1970                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1971                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1972
1973                 $messages = $data->message;
1974
1975                 if (!count($messages)) {
1976                         Logger::log("empty conversation");
1977                         return false;
1978                 }
1979
1980                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1981                 if (!$contact) {
1982                         return false;
1983                 }
1984
1985                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1986                 if (!DBA::isResult($conversation)) {
1987                         $r = q(
1988                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1989                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1990                                 intval($importer["uid"]),
1991                                 DBA::escape($guid),
1992                                 DBA::escape($author),
1993                                 DBA::escape($created_at),
1994                                 DBA::escape(DateTimeFormat::utcNow()),
1995                                 DBA::escape($subject),
1996                                 DBA::escape($participants)
1997                         );
1998                         if ($r) {
1999                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
2000                         }
2001                 }
2002                 if (!$conversation) {
2003                         Logger::log("unable to create conversation.");
2004                         return false;
2005                 }
2006
2007                 foreach ($messages as $mesg) {
2008                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
2009                 }
2010
2011                 return true;
2012         }
2013
2014         /**
2015          * Processes "like" messages
2016          *
2017          * @param array  $importer Array of the importer user
2018          * @param string $sender   The sender of the message
2019          * @param object $data     The message object
2020          *
2021          * @return int The message id of the generated like or "false" if there was an error
2022          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2023          * @throws \ImagickException
2024          */
2025         private static function receiveLike(array $importer, $sender, $data)
2026         {
2027                 $author = Strings::escapeTags(XML::unescape($data->author));
2028                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2029                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2030                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
2031                 $positive = Strings::escapeTags(XML::unescape($data->positive));
2032
2033                 // likes on comments aren't supported by Diaspora - only on posts
2034                 // But maybe this will be supported in the future, so we will accept it.
2035                 if (!in_array($parent_type, ["Post", "Comment"])) {
2036                         return false;
2037                 }
2038
2039                 $contact = self::allowedContactByHandle($importer, $sender, true);
2040                 if (!$contact) {
2041                         return false;
2042                 }
2043
2044                 $message_id = self::messageExists($importer["uid"], $guid);
2045                 if ($message_id) {
2046                         return true;
2047                 }
2048
2049                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
2050                 if (!$parent_item) {
2051                         return false;
2052                 }
2053
2054                 $person = self::personByHandle($author);
2055                 if (!is_array($person)) {
2056                         Logger::log("unable to find author details");
2057                         return false;
2058                 }
2059
2060                 // Fetch the contact id - if we know this contact
2061                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2062
2063                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2064                 // We would accept this anyhow.
2065                 if ($positive == "true") {
2066                         $verb = Activity::LIKE;
2067                 } else {
2068                         $verb = Activity::DISLIKE;
2069                 }
2070
2071                 $datarray = [];
2072
2073                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2074
2075                 $datarray["uid"] = $importer["uid"];
2076                 $datarray["contact-id"] = $author_contact["cid"];
2077                 $datarray["network"]  = $author_contact["network"];
2078
2079                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
2080                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
2081
2082                 $datarray["guid"] = $guid;
2083                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2084
2085                 $datarray["verb"] = $verb;
2086                 $datarray["gravity"] = GRAVITY_ACTIVITY;
2087                 $datarray["parent-uri"] = $parent_item["uri"];
2088
2089                 $datarray["object-type"] = Activity\ObjectType::NOTE;
2090
2091                 $datarray["body"] = $verb;
2092
2093                 // Diaspora doesn't provide a date for likes
2094                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
2095
2096                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2097                 if ($parent_item["id"] != $parent_item["parent"]) {
2098                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item["parent"]]);
2099                         $origin = $toplevel["origin"];
2100                 } else {
2101                         $origin = $parent_item["origin"];
2102                 }
2103
2104                 // If we are the origin of the parent we store the original data.
2105                 // We notify our followers during the item storage.
2106                 if ($origin) {
2107                         $datarray['diaspora_signed_text'] = json_encode($data);
2108                 }
2109
2110                 $message_id = Item::insert($datarray);
2111
2112                 if ($message_id <= 0) {
2113                         return false;
2114                 }
2115
2116                 if ($message_id) {
2117                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2118                         if ($datarray['uid'] == 0) {
2119                                 Item::distribute($message_id, json_encode($data));
2120                         }
2121                 }
2122
2123                 return true;
2124         }
2125
2126         /**
2127          * Processes private messages
2128          *
2129          * @param array  $importer Array of the importer user
2130          * @param object $data     The message object
2131          *
2132          * @return bool Success?
2133          * @throws \Exception
2134          */
2135         private static function receiveMessage(array $importer, $data)
2136         {
2137                 $author = Strings::escapeTags(XML::unescape($data->author));
2138                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2139                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
2140                 $text = XML::unescape($data->text);
2141                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2142
2143                 $contact = self::allowedContactByHandle($importer, $author, true);
2144                 if (!$contact) {
2145                         return false;
2146                 }
2147
2148                 $conversation = null;
2149
2150                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
2151                 $conversation = DBA::selectFirst('conv', [], $condition);
2152
2153                 if (!DBA::isResult($conversation)) {
2154                         Logger::log("conversation not available.");
2155                         return false;
2156                 }
2157
2158                 $message_uri = $author.":".$guid;
2159
2160                 $person = self::personByHandle($author);
2161                 if (!$person) {
2162                         Logger::log("unable to find author details");
2163                         return false;
2164                 }
2165
2166                 $body = Markdown::toBBCode($text);
2167
2168                 $body = self::replacePeopleGuid($body, $person["url"]);
2169
2170                 return Mail::insert([
2171                         'uid'        => $importer['uid'],
2172                         'guid'       => $guid,
2173                         'convid'     => $conversation['id'],
2174                         'from-name'  => $person['name'],
2175                         'from-photo' => $person['photo'],
2176                         'from-url'   => $person['url'],
2177                         'contact-id' => $contact['id'],
2178                         'title'      => $conversation['subject'],
2179                         'body'       => $body,
2180                         'reply'      => 1,
2181                         'uri'        => $message_uri,
2182                         'parent-uri' => $author.":".$conversation['guid'],
2183                         'created'    => $created_at
2184                 ]);
2185         }
2186
2187         /**
2188          * Processes participations - unsupported by now
2189          *
2190          * @param array  $importer Array of the importer user
2191          * @param object $data     The message object
2192          *
2193          * @return bool always true
2194          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2195          * @throws \ImagickException
2196          */
2197         private static function receiveParticipation(array $importer, $data)
2198         {
2199                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2200                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2201
2202                 $contact_id = Contact::getIdForURL($author);
2203                 if (!$contact_id) {
2204                         Logger::log('Contact not found: '.$author);
2205                         return false;
2206                 }
2207
2208                 $person = self::personByHandle($author);
2209                 if (!is_array($person)) {
2210                         Logger::log("Person not found: ".$author);
2211                         return false;
2212                 }
2213
2214                 $item = Item::selectFirst(['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => [Item::PUBLIC, Item::UNLISTED]]);
2215                 if (!DBA::isResult($item)) {
2216                         Logger::log('Item not found, no origin or private: '.$parent_guid);
2217                         return false;
2218                 }
2219
2220                 $author_parts = explode('@', $author);
2221                 if (isset($author_parts[1])) {
2222                         $server = $author_parts[1];
2223                 } else {
2224                         // Should never happen
2225                         $server = $author;
2226                 }
2227
2228                 Logger::log('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, Logger::DEBUG);
2229
2230                 if (!DBA::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2231                         DBA::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2232                 }
2233
2234                 // Send all existing comments and likes to the requesting server
2235                 $comments = Item::select(['id', 'parent', 'verb', 'self'], ['parent' => $item['id']]);
2236                 while ($comment = Item::fetch($comments)) {
2237                         if ($comment['id'] == $comment['parent']) {
2238                                 continue;
2239                         }
2240
2241                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $contact_id]);
2242                         if (Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $contact_id)) {
2243                                 ItemDeliveryData::incrementQueueCount($comment['id'], 1);
2244                         }
2245                 }
2246                 DBA::close($comments);
2247
2248                 return true;
2249         }
2250
2251         /**
2252          * Processes photos - unneeded
2253          *
2254          * @param array  $importer Array of the importer user
2255          * @param object $data     The message object
2256          *
2257          * @return bool always true
2258          */
2259         private static function receivePhoto(array $importer, $data)
2260         {
2261                 // There doesn't seem to be a reason for this function,
2262                 // since the photo data is transmitted in the status message as well
2263                 return true;
2264         }
2265
2266         /**
2267          * Processes poll participations - unssupported
2268          *
2269          * @param array  $importer Array of the importer user
2270          * @param object $data     The message object
2271          *
2272          * @return bool always true
2273          */
2274         private static function receivePollParticipation(array $importer, $data)
2275         {
2276                 // We don't support polls by now
2277                 return true;
2278         }
2279
2280         /**
2281          * Processes incoming profile updates
2282          *
2283          * @param array  $importer Array of the importer user
2284          * @param object $data     The message object
2285          *
2286          * @return bool Success
2287          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2288          * @throws \ImagickException
2289          */
2290         private static function receiveProfile(array $importer, $data)
2291         {
2292                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2293
2294                 $contact = self::contactByHandle($importer["uid"], $author);
2295                 if (!$contact) {
2296                         return false;
2297                 }
2298
2299                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2300                 $image_url = XML::unescape($data->image_url);
2301                 $birthday = XML::unescape($data->birthday);
2302                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2303                 $location = Markdown::toBBCode(XML::unescape($data->location));
2304                 $searchable = (XML::unescape($data->searchable) == "true");
2305                 $nsfw = (XML::unescape($data->nsfw) == "true");
2306                 $tags = XML::unescape($data->tag_string);
2307
2308                 $tags = explode("#", $tags);
2309
2310                 $keywords = [];
2311                 foreach ($tags as $tag) {
2312                         $tag = trim(strtolower($tag));
2313                         if ($tag != "") {
2314                                 $keywords[] = $tag;
2315                         }
2316                 }
2317
2318                 $keywords = implode(", ", $keywords);
2319
2320                 $handle_parts = explode("@", $author);
2321                 $nick = $handle_parts[0];
2322
2323                 if ($name === "") {
2324                         $name = $handle_parts[0];
2325                 }
2326
2327                 if (preg_match("|^https?://|", $image_url) === 0) {
2328                         $image_url = "http://".$handle_parts[1].$image_url;
2329                 }
2330
2331                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2332
2333                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2334
2335                 $birthday = str_replace("1000", "1901", $birthday);
2336
2337                 if ($birthday != "") {
2338                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2339                 }
2340
2341                 // this is to prevent multiple birthday notifications in a single year
2342                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2343
2344                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2345                         $birthday = $contact["bd"];
2346                 }
2347
2348                 $fields = ['name' => $name, 'location' => $location,
2349                         'name-date' => DateTimeFormat::utcNow(), 'about' => $about,
2350                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2351                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2352
2353                 if (!empty($birthday)) {
2354                         $fields['bd'] = $birthday;
2355                 }
2356
2357                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2358
2359                 // @todo Update the public contact, then update the gcontact from that
2360
2361                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2362                                         "photo" => $image_url, "name" => $name, "location" => $location,
2363                                         "about" => $about, "birthday" => $birthday,
2364                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2365                                         "hide" => !$searchable, "nsfw" => $nsfw];
2366
2367                 $gcid = GContact::update($gcontact);
2368
2369                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2370
2371                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2372
2373                 return true;
2374         }
2375
2376         /**
2377          * Processes incoming friend requests
2378          *
2379          * @param array $importer Array of the importer user
2380          * @param array $contact  The contact that send the request
2381          * @return void
2382          * @throws \Exception
2383          */
2384         private static function receiveRequestMakeFriend(array $importer, array $contact)
2385         {
2386                 if ($contact["rel"] == Contact::SHARING) {
2387                         DBA::update(
2388                                 'contact',
2389                                 ['rel' => Contact::FRIEND, 'writable' => true],
2390                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2391                         );
2392                 }
2393         }
2394
2395         /**
2396          * Processes incoming sharing notification
2397          *
2398          * @param array  $importer Array of the importer user
2399          * @param object $data     The message object
2400          *
2401          * @return bool Success
2402          * @throws \Exception
2403          */
2404         private static function receiveContactRequest(array $importer, $data)
2405         {
2406                 $author = XML::unescape($data->author);
2407                 $recipient = XML::unescape($data->recipient);
2408
2409                 if (!$author || !$recipient) {
2410                         return false;
2411                 }
2412
2413                 // the current protocol version doesn't know these fields
2414                 // That means that we will assume their existance
2415                 if (isset($data->following)) {
2416                         $following = (XML::unescape($data->following) == "true");
2417                 } else {
2418                         $following = true;
2419                 }
2420
2421                 if (isset($data->sharing)) {
2422                         $sharing = (XML::unescape($data->sharing) == "true");
2423                 } else {
2424                         $sharing = true;
2425                 }
2426
2427                 $contact = self::contactByHandle($importer["uid"], $author);
2428
2429                 // perhaps we were already sharing with this person. Now they're sharing with us.
2430                 // That makes us friends.
2431                 if ($contact) {
2432                         if ($following) {
2433                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2434                                 self::receiveRequestMakeFriend($importer, $contact);
2435
2436                                 // refetch the contact array
2437                                 $contact = self::contactByHandle($importer["uid"], $author);
2438
2439                                 // If we are now friends, we are sending a share message.
2440                                 // Normally we needn't to do so, but the first message could have been vanished.
2441                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2442                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2443                                         if (DBA::isResult($user)) {
2444                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2445                                                 self::sendShare($user, $contact);
2446                                         }
2447                                 }
2448                                 return true;
2449                         } else {
2450                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2451                                 Contact::removeFollower($importer, $contact);
2452                                 return true;
2453                         }
2454                 }
2455
2456                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2457                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2458                         return false;
2459                 } elseif (!$following && !$sharing) {
2460                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2461                         return false;
2462                 } elseif (!$following && $sharing) {
2463                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2464                 } elseif ($following && $sharing) {
2465                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2466                 } elseif ($following && !$sharing) {
2467                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2468                 }
2469
2470                 $ret = self::personByHandle($author);
2471
2472                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2473                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2474                         return false;
2475                 }
2476
2477                 $cid = Contact::getIdForURL($ret['url'], $importer['uid']);
2478                 if (!empty($cid)) {
2479                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
2480                 } else {
2481                         $contact = [];
2482                 }
2483
2484                 $item = ['author-id' => Contact::getIdForURL($ret['url']),
2485                         'author-link' => $ret['url']];
2486
2487                 $result = Contact::addRelationship($importer, $contact, $item, false);
2488                 if ($result === true) {
2489                         $contact_record = self::contactByHandle($importer['uid'], $author);
2490                         if (!$contact_record) {
2491                                 Logger::info('unable to locate newly created contact record.');
2492                                 return;
2493                         }
2494
2495                         $user = DBA::selectFirst('user', [], ['uid' => $importer['uid']]);
2496                         if (DBA::isResult($user)) {
2497                                 self::sendShare($user, $contact_record);
2498
2499                                 // Send the profile data, maybe it weren't transmitted before
2500                                 self::sendProfile($importer['uid'], [$contact_record]);
2501                         }
2502                 }
2503
2504                 return true;
2505         }
2506
2507         /**
2508          * Fetches a message with a given guid
2509          *
2510          * @param string $guid        message guid
2511          * @param string $orig_author handle of the original post
2512          * @return array The fetched item
2513          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2514          * @throws \ImagickException
2515          */
2516         public static function originalItem($guid, $orig_author)
2517         {
2518                 if (empty($guid)) {
2519                         Logger::log('Empty guid. Quitting.');
2520                         return false;
2521                 }
2522
2523                 // Do we already have this item?
2524                 $fields = ['body', 'title', 'attach', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2525                         'author-name', 'author-link', 'author-avatar'];
2526                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2527                 $item = Item::selectFirst($fields, $condition);
2528
2529                 if (DBA::isResult($item)) {
2530                         Logger::log("reshared message ".$guid." already exists on system.");
2531
2532                         // Maybe it is already a reshared item?
2533                         // Then refetch the content, if it is a reshare from a reshare.
2534                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2535                         if (self::isReshare($item["body"], true)) {
2536                                 $item = [];
2537                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2538                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2539
2540                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2541
2542                                 // Add OEmbed and other information to the body
2543                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2544
2545                                 return $item;
2546                         } else {
2547                                 return $item;
2548                         }
2549                 }
2550
2551                 if (!DBA::isResult($item)) {
2552                         if (empty($orig_author)) {
2553                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2554                                 return false;
2555                         }
2556
2557                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2558                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2559                         $stored = self::storeByGuid($guid, $server);
2560
2561                         if (!$stored) {
2562                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2563                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2564                                 $stored = self::storeByGuid($guid, $server);
2565                         }
2566
2567                         if ($stored) {
2568                                 $fields = ['body', 'title', 'attach', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2569                                         'author-name', 'author-link', 'author-avatar'];
2570                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2571                                 $item = Item::selectFirst($fields, $condition);
2572
2573                                 if (DBA::isResult($item)) {
2574                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2575                                         if (self::isReshare($item["body"], false)) {
2576                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2577                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2578                                         }
2579
2580                                         return $item;
2581                                 }
2582                         }
2583                 }
2584                 return false;
2585         }
2586
2587         /**
2588          * Stores a reshare activity
2589          *
2590          * @param array   $item              Array of reshare post
2591          * @param integer $parent_message_id Id of the parent post
2592          * @param string  $guid              GUID string of reshare action
2593          * @param string  $author            Author handle
2594          */
2595         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2596         {
2597                 $parent = Item::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2598
2599                 $datarray = [];
2600
2601                 $datarray['uid'] = $item['uid'];
2602                 $datarray['contact-id'] = $item['contact-id'];
2603                 $datarray['network'] = $item['network'];
2604
2605                 $datarray['author-link'] = $item['author-link'];
2606                 $datarray['author-id'] = $item['author-id'];
2607
2608                 $datarray['owner-link'] = $datarray['author-link'];
2609                 $datarray['owner-id'] = $datarray['author-id'];
2610
2611                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2612                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2613                 $datarray['parent-uri'] = $parent['uri'];
2614
2615                 $datarray['verb'] = $datarray['body'] = Activity::ANNOUNCE;
2616                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2617                 $datarray['object-type'] = Activity\ObjectType::NOTE;
2618
2619                 $datarray['protocol'] = $item['protocol'];
2620
2621                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2622                 $datarray['private'] = $item['private'];
2623                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2624
2625                 $message_id = Item::insert($datarray);
2626
2627                 if ($message_id) {
2628                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2629                         if ($datarray['uid'] == 0) {
2630                                 Item::distribute($message_id);
2631                         }
2632                 }
2633         }
2634
2635         /**
2636          * Processes a reshare message
2637          *
2638          * @param array  $importer Array of the importer user
2639          * @param object $data     The message object
2640          * @param string $xml      The original XML of the message
2641          *
2642          * @return int the message id
2643          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2644          * @throws \ImagickException
2645          */
2646         private static function receiveReshare(array $importer, $data, $xml)
2647         {
2648                 $author = Strings::escapeTags(XML::unescape($data->author));
2649                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2650                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2651                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2652                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2653                 /// @todo handle unprocessed property "provider_display_name"
2654                 $public = Strings::escapeTags(XML::unescape($data->public));
2655
2656                 $contact = self::allowedContactByHandle($importer, $author, false);
2657                 if (!$contact) {
2658                         return false;
2659                 }
2660
2661                 $message_id = self::messageExists($importer["uid"], $guid);
2662                 if ($message_id) {
2663                         return true;
2664                 }
2665
2666                 $original_item = self::originalItem($root_guid, $root_author);
2667                 if (!$original_item) {
2668                         return false;
2669                 }
2670
2671                 $orig_url = DI::baseUrl()."/display/".$original_item["guid"];
2672
2673                 $datarray = [];
2674
2675                 $datarray["uid"] = $importer["uid"];
2676                 $datarray["contact-id"] = $contact["id"];
2677                 $datarray["network"]  = Protocol::DIASPORA;
2678
2679                 $datarray["author-link"] = $contact["url"];
2680                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2681
2682                 $datarray["owner-link"] = $datarray["author-link"];
2683                 $datarray["owner-id"] = $datarray["author-id"];
2684
2685                 $datarray["guid"] = $guid;
2686                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2687
2688                 $datarray["verb"] = Activity::POST;
2689                 $datarray["gravity"] = GRAVITY_PARENT;
2690
2691                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2692                 $datarray["source"] = $xml;
2693
2694                 $prefix = share_header(
2695                         $original_item["author-name"],
2696                         $original_item["author-link"],
2697                         $original_item["author-avatar"],
2698                         $original_item["guid"],
2699                         $original_item["created"],
2700                         $orig_url
2701                 );
2702
2703                 if (!empty($original_item['title'])) {
2704                         $prefix .= '[h3]' . $original_item['title'] . "[/h3]\n";
2705                 }
2706
2707                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2708
2709                 $datarray["tag"] = $original_item["tag"];
2710                 $datarray["attach"] = $original_item["attach"];
2711                 $datarray["app"]  = $original_item["app"];
2712
2713                 $datarray["plink"] = self::plink($author, $guid);
2714                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2715                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2716
2717                 $datarray["object-type"] = $original_item["object-type"];
2718
2719                 self::fetchGuid($datarray);
2720                 $message_id = Item::insert($datarray);
2721
2722                 self::sendParticipation($contact, $datarray);
2723
2724                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2725                 if ($root_message_id) {
2726                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2727                 }
2728
2729                 if ($message_id) {
2730                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2731                         if ($datarray['uid'] == 0) {
2732                                 Item::distribute($message_id);
2733                         }
2734                         return true;
2735                 } else {
2736                         return false;
2737                 }
2738         }
2739
2740         /**
2741          * Processes retractions
2742          *
2743          * @param array  $importer Array of the importer user
2744          * @param array  $contact  The contact of the item owner
2745          * @param object $data     The message object
2746          *
2747          * @return bool success
2748          * @throws \Exception
2749          */
2750         private static function itemRetraction(array $importer, array $contact, $data)
2751         {
2752                 $author = Strings::escapeTags(XML::unescape($data->author));
2753                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2754                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2755
2756                 $person = self::personByHandle($author);
2757                 if (!is_array($person)) {
2758                         Logger::log("unable to find author detail for ".$author);
2759                         return false;
2760                 }
2761
2762                 if (empty($contact["url"])) {
2763                         $contact["url"] = $person["url"];
2764                 }
2765
2766                 // Fetch items that are about to be deleted
2767                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2768
2769                 // When we receive a public retraction, we delete every item that we find.
2770                 if ($importer['uid'] == 0) {
2771                         $condition = ['guid' => $target_guid, 'deleted' => false];
2772                 } else {
2773                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2774                 }
2775
2776                 $r = Item::select($fields, $condition);
2777                 if (!DBA::isResult($r)) {
2778                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2779                         return false;
2780                 }
2781
2782                 while ($item = Item::fetch($r)) {
2783                         if (strstr($item['file'], '[')) {
2784                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2785                                 continue;
2786                         }
2787
2788                         // Fetch the parent item
2789                         $parent = Item::selectFirst(['author-link'], ['id' => $item["parent"]]);
2790
2791                         // Only delete it if the parent author really fits
2792                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2793                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2794                                 continue;
2795                         }
2796
2797                         Item::markForDeletion(['id' => $item['id']]);
2798
2799                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], Logger::DEBUG);
2800                 }
2801
2802                 return true;
2803         }
2804
2805         /**
2806          * Receives retraction messages
2807          *
2808          * @param array  $importer Array of the importer user
2809          * @param string $sender   The sender of the message
2810          * @param object $data     The message object
2811          *
2812          * @return bool Success
2813          * @throws \Exception
2814          */
2815         private static function receiveRetraction(array $importer, $sender, $data)
2816         {
2817                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2818
2819                 $contact = self::contactByHandle($importer["uid"], $sender);
2820                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2821                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2822                         return false;
2823                 }
2824
2825                 if (!$contact) {
2826                         $contact = [];
2827                 }
2828
2829                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2830
2831                 switch ($target_type) {
2832                         case "Comment":
2833                         case "Like":
2834                         case "Post":
2835                         case "Reshare":
2836                         case "StatusMessage":
2837                                 return self::itemRetraction($importer, $contact, $data);
2838
2839                         case "PollParticipation":
2840                         case "Photo":
2841                                 // Currently unsupported
2842                                 break;
2843
2844                         default:
2845                                 Logger::log("Unknown target type ".$target_type);
2846                                 return false;
2847                 }
2848                 return true;
2849         }
2850
2851         /**
2852          * Receives status messages
2853          *
2854          * @param array            $importer Array of the importer user
2855          * @param SimpleXMLElement $data     The message object
2856          * @param string           $xml      The original XML of the message
2857          *
2858          * @return int The message id of the newly created item
2859          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2860          * @throws \ImagickException
2861          */
2862         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2863         {
2864                 $author = Strings::escapeTags(XML::unescape($data->author));
2865                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2866                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2867                 $public = Strings::escapeTags(XML::unescape($data->public));
2868                 $text = XML::unescape($data->text);
2869                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2870
2871                 $contact = self::allowedContactByHandle($importer, $author, false);
2872                 if (!$contact) {
2873                         return false;
2874                 }
2875
2876                 $message_id = self::messageExists($importer["uid"], $guid);
2877                 if ($message_id) {
2878                         return true;
2879                 }
2880
2881                 $address = [];
2882                 if ($data->location) {
2883                         foreach ($data->location->children() as $fieldname => $data) {
2884                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2885                         }
2886                 }
2887
2888                 $body = Markdown::toBBCode($text);
2889
2890                 $datarray = [];
2891
2892                 // Attach embedded pictures to the body
2893                 if ($data->photo) {
2894                         foreach ($data->photo as $photo) {
2895                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2896                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2897                         }
2898
2899                         $datarray["object-type"] = Activity\ObjectType::IMAGE;
2900                 } else {
2901                         $datarray["object-type"] = Activity\ObjectType::NOTE;
2902
2903                         // Add OEmbed and other information to the body
2904                         if (!self::isRedmatrix($contact["url"])) {
2905                                 $body = add_page_info_to_body($body, false, true);
2906                         }
2907                 }
2908
2909                 /// @todo enable support for polls
2910                 //if ($data->poll) {
2911                 //      foreach ($data->poll AS $poll)
2912                 //              print_r($poll);
2913                 //      die("poll!\n");
2914                 //}
2915
2916                 /// @todo enable support for events
2917
2918                 $datarray["uid"] = $importer["uid"];
2919                 $datarray["contact-id"] = $contact["id"];
2920                 $datarray["network"] = Protocol::DIASPORA;
2921
2922                 $datarray["author-link"] = $contact["url"];
2923                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2924
2925                 $datarray["owner-link"] = $datarray["author-link"];
2926                 $datarray["owner-id"] = $datarray["author-id"];
2927
2928                 $datarray["guid"] = $guid;
2929                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2930
2931                 $datarray["verb"] = Activity::POST;
2932                 $datarray["gravity"] = GRAVITY_PARENT;
2933
2934                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2935                 $datarray["source"] = $xml;
2936
2937                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2938
2939                 if ($provider_display_name != "") {
2940                         $datarray["app"] = $provider_display_name;
2941                 }
2942
2943                 $datarray["plink"] = self::plink($author, $guid);
2944                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2945                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2946
2947                 if (isset($address["address"])) {
2948                         $datarray["location"] = $address["address"];
2949                 }
2950
2951                 if (isset($address["lat"]) && isset($address["lng"])) {
2952                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2953                 }
2954
2955                 self::fetchGuid($datarray);
2956                 $message_id = Item::insert($datarray);
2957
2958                 self::sendParticipation($contact, $datarray);
2959
2960                 if ($message_id) {
2961                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2962                         if ($datarray['uid'] == 0) {
2963                                 Item::distribute($message_id);
2964                         }
2965                         return true;
2966                 } else {
2967                         return false;
2968                 }
2969         }
2970
2971         /* ************************************************************************************** *
2972          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2973          * ************************************************************************************** */
2974
2975         /**
2976          * returnes the handle of a contact
2977          *
2978          * @param array $contact contact array
2979          *
2980          * @return string the handle in the format user@domain.tld
2981          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2982          */
2983         private static function myHandle(array $contact)
2984         {
2985                 if (!empty($contact["addr"])) {
2986                         return $contact["addr"];
2987                 }
2988
2989                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2990                 // So - just in case - we build the the address here.
2991                 if ($contact["nickname"] != "") {
2992                         $nick = $contact["nickname"];
2993                 } else {
2994                         $nick = $contact["nick"];
2995                 }
2996
2997                 return $nick . "@" . substr(DI::baseUrl(), strpos(DI::baseUrl(), "://") + 3);
2998         }
2999
3000
3001         /**
3002          * Creates the data for a private message in the new format
3003          *
3004          * @param string $msg     The message that is to be transmitted
3005          * @param array  $user    The record of the sender
3006          * @param array  $contact Target of the communication
3007          * @param string $prvkey  The private key of the sender
3008          * @param string $pubkey  The public key of the receiver
3009          *
3010          * @return string The encrypted data
3011          * @throws \Exception
3012          */
3013         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
3014         {
3015                 Logger::log("Message: ".$msg, Logger::DATA);
3016
3017                 // without a public key nothing will work
3018                 if (!$pubkey) {
3019                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
3020                         return false;
3021                 }
3022
3023                 $aes_key = openssl_random_pseudo_bytes(32);
3024                 $b_aes_key = base64_encode($aes_key);
3025                 $iv = openssl_random_pseudo_bytes(16);
3026                 $b_iv = base64_encode($iv);
3027
3028                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3029
3030                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3031
3032                 $encrypted_key_bundle = "";
3033                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3034
3035                 $json_object = json_encode(
3036                         ["aes_key" => base64_encode($encrypted_key_bundle),
3037                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3038                 );
3039
3040                 return $json_object;
3041         }
3042
3043         /**
3044          * Creates the envelope for the "fetch" endpoint and for the new format
3045          *
3046          * @param string $msg  The message that is to be transmitted
3047          * @param array  $user The record of the sender
3048          *
3049          * @return string The envelope
3050          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3051          */
3052         public static function buildMagicEnvelope($msg, array $user)
3053         {
3054                 $b64url_data = Strings::base64UrlEncode($msg);
3055                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3056
3057                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
3058                 $type = "application/xml";
3059                 $encoding = "base64url";
3060                 $alg = "RSA-SHA256";
3061                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
3062
3063                 // Fallback if the private key wasn't transmitted in the expected field
3064                 if ($user['uprvkey'] == "") {
3065                         $user['uprvkey'] = $user['prvkey'];
3066                 }
3067
3068                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3069                 $sig = Strings::base64UrlEncode($signature);
3070
3071                 $xmldata = ["me:env" => ["me:data" => $data,
3072                                                         "@attributes" => ["type" => $type],
3073                                                         "me:encoding" => $encoding,
3074                                                         "me:alg" => $alg,
3075                                                         "me:sig" => $sig,
3076                                                         "@attributes2" => ["key_id" => $key_id]]];
3077
3078                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3079
3080                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3081         }
3082
3083         /**
3084          * Create the envelope for a message
3085          *
3086          * @param string $msg     The message that is to be transmitted
3087          * @param array  $user    The record of the sender
3088          * @param array  $contact Target of the communication
3089          * @param string $prvkey  The private key of the sender
3090          * @param string $pubkey  The public key of the receiver
3091          * @param bool   $public  Is the message public?
3092          *
3093          * @return string The message that will be transmitted to other servers
3094          * @throws \Exception
3095          */
3096         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3097         {
3098                 // The message is put into an envelope with the sender's signature
3099                 $envelope = self::buildMagicEnvelope($msg, $user);
3100
3101                 // Private messages are put into a second envelope, encrypted with the receivers public key
3102                 if (!$public) {
3103                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3104                 }
3105
3106                 return $envelope;
3107         }
3108
3109         /**
3110          * Creates a signature for a message
3111          *
3112          * @param array $owner   the array of the owner of the message
3113          * @param array $message The message that is to be signed
3114          *
3115          * @return string The signature
3116          */
3117         private static function signature($owner, $message)
3118         {
3119                 $sigmsg = $message;
3120                 unset($sigmsg["author_signature"]);
3121                 unset($sigmsg["parent_author_signature"]);
3122
3123                 $signed_text = implode(";", $sigmsg);
3124
3125                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3126         }
3127
3128         /**
3129          * Transmit a message to a target server
3130          *
3131          * @param array  $owner        the array of the item owner
3132          * @param array  $contact      Target of the communication
3133          * @param string $envelope     The message that is to be transmitted
3134          * @param bool   $public_batch Is it a public post?
3135          * @param string $guid         message guid
3136          *
3137          * @return int Result of the transmission
3138          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3139          * @throws \ImagickException
3140          */
3141         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
3142         {
3143                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
3144                 if (!$enabled) {
3145                         return 200;
3146                 }
3147
3148                 $logid = Strings::getRandomHex(4);
3149
3150                 // We always try to use the data from the fcontact table.
3151                 // This is important for transmitting data to Friendica servers.
3152                 if (!empty($contact['addr'])) {
3153                         $fcontact = self::personByHandle($contact['addr']);
3154                         if (!empty($fcontact)) {
3155                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3156                         }
3157                 }
3158
3159                 if (empty($dest_url)) {
3160                         $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3161                 }
3162
3163                 if (!$dest_url) {
3164                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3165                         return 0;
3166                 }
3167
3168                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3169
3170                 if (!intval(DI::config()->get("system", "diaspora_test"))) {
3171                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3172
3173                         $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3174                         $return_code = $postResult->getReturnCode();
3175                 } else {
3176                         Logger::log("test_mode");
3177                         return 200;
3178                 }
3179
3180                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3181
3182                 return $return_code ? $return_code : -1;
3183         }
3184
3185
3186         /**
3187          * Build the post xml
3188          *
3189          * @param string $type    The message type
3190          * @param array  $message The message data
3191          *
3192          * @return string The post XML
3193          */
3194         public static function buildPostXml($type, $message)
3195         {
3196                 $data = [$type => $message];
3197
3198                 return XML::fromArray($data, $xml);
3199         }
3200
3201         /**
3202          * Builds and transmit messages
3203          *
3204          * @param array  $owner        the array of the item owner
3205          * @param array  $contact      Target of the communication
3206          * @param string $type         The message type
3207          * @param array  $message      The message data
3208          * @param bool   $public_batch Is it a public post?
3209          * @param string $guid         message guid
3210          *
3211          * @return int Result of the transmission
3212          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3213          * @throws \ImagickException
3214          */
3215         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "")
3216         {
3217                 $msg = self::buildPostXml($type, $message);
3218
3219                 Logger::log('message: '.$msg, Logger::DATA);
3220                 Logger::log('send guid '.$guid, Logger::DEBUG);
3221
3222                 // Fallback if the private key wasn't transmitted in the expected field
3223                 if (empty($owner['uprvkey'])) {
3224                         $owner['uprvkey'] = $owner['prvkey'];
3225                 }
3226
3227                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3228
3229                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3230
3231                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3232
3233                 return $return_code;
3234         }
3235
3236         /**
3237          * sends a participation (Used to get all further updates)
3238          *
3239          * @param array $contact Target of the communication
3240          * @param array $item    Item array
3241          *
3242          * @return int The result of the transmission
3243          * @throws \Exception
3244          */
3245         private static function sendParticipation(array $contact, array $item)
3246         {
3247                 // Don't send notifications for private postings
3248                 if ($item['private'] == Item::PRIVATE) {
3249                         return;
3250                 }
3251
3252                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3253
3254                 $result = DI::cache()->get($cachekey);
3255                 if (!is_null($result)) {
3256                         return;
3257                 }
3258
3259                 // Fetch some user id to have a valid handle to transmit the participation.
3260                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3261                 // If the item belongs to a user, we take this user id.
3262                 if ($item['uid'] == 0) {
3263                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3264                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3265                         $owner = User::getOwnerDataById($first_user['uid']);
3266                 } else {
3267                         $owner = User::getOwnerDataById($item['uid']);
3268                 }
3269
3270                 $author = self::myHandle($owner);
3271
3272                 $message = ["author" => $author,
3273                                 "guid" => System::createUUID(),
3274                                 "parent_type" => "Post",
3275                                 "parent_guid" => $item["guid"]];
3276
3277                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3278
3279                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3280                 DI::cache()->set($cachekey, $item["guid"], Duration::QUARTER_HOUR);
3281
3282                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3283         }
3284
3285         /**
3286          * sends an account migration
3287          *
3288          * @param array $owner   the array of the item owner
3289          * @param array $contact Target of the communication
3290          * @param int   $uid     User ID
3291          *
3292          * @return int The result of the transmission
3293          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3294          * @throws \ImagickException
3295          */
3296         public static function sendAccountMigration(array $owner, array $contact, $uid)
3297         {
3298                 $old_handle = DI::pConfig()->get($uid, 'system', 'previous_addr');
3299                 $profile = self::createProfileData($uid);
3300
3301                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3302                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3303
3304                 $message = ["author" => $old_handle,
3305                                 "profile" => $profile,
3306                                 "signature" => $signature];
3307
3308                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3309
3310                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3311         }
3312
3313         /**
3314          * Sends a "share" message
3315          *
3316          * @param array $owner   the array of the item owner
3317          * @param array $contact Target of the communication
3318          *
3319          * @return int The result of the transmission
3320          * @throws \Exception
3321          */
3322         public static function sendShare(array $owner, array $contact)
3323         {
3324                 /**
3325                  * @todo support the different possible combinations of "following" and "sharing"
3326                  * Currently, Diaspora only interprets the "sharing" field
3327                  *
3328                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3329                  */
3330
3331                 /*
3332                 switch ($contact["rel"]) {
3333                         case Contact::FRIEND:
3334                                 $following = true;
3335                                 $sharing = true;
3336
3337                         case Contact::SHARING:
3338                                 $following = false;
3339                                 $sharing = true;
3340
3341                         case Contact::FOLLOWER:
3342                                 $following = true;
3343                                 $sharing = false;
3344                 }
3345                 */
3346
3347                 $message = ["author" => self::myHandle($owner),
3348                                 "recipient" => $contact["addr"],
3349                                 "following" => "true",
3350                                 "sharing" => "true"];
3351
3352                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3353
3354                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3355         }
3356
3357         /**
3358          * sends an "unshare"
3359          *
3360          * @param array $owner   the array of the item owner
3361          * @param array $contact Target of the communication
3362          *
3363          * @return int The result of the transmission
3364          * @throws \Exception
3365          */
3366         public static function sendUnshare(array $owner, array $contact)
3367         {
3368                 $message = ["author" => self::myHandle($owner),
3369                                 "recipient" => $contact["addr"],
3370                                 "following" => "false",
3371                                 "sharing" => "false"];
3372
3373                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3374
3375                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3376         }
3377
3378         /**
3379          * Checks a message body if it is a reshare
3380          *
3381          * @param string $body     The message body that is to be check
3382          * @param bool   $complete Should it be a complete check or a simple check?
3383          *
3384          * @return array|bool Reshare details or "false" if no reshare
3385          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3386          * @throws \ImagickException
3387          */
3388         public static function isReshare($body, $complete = true)
3389         {
3390                 $body = trim($body);
3391
3392                 $reshared = Item::getShareArray(['body' => $body]);
3393                 if (empty($reshared)) {
3394                         return false;
3395                 }
3396
3397                 // Skip if it isn't a pure repeated messages
3398                 // Does it start with a share?
3399                 if (!empty($reshared['comment']) && $complete) {
3400                         return false;
3401                 }
3402
3403                 if (!empty($reshared['guid']) && $complete) {
3404                         $condition = ['guid' => $reshared['guid'], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3405                         $item = Item::selectFirst(['contact-id'], $condition);
3406                         if (DBA::isResult($item)) {
3407                                 $ret = [];
3408                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3409                                 $ret["root_guid"] = $reshared['guid'];
3410                                 return $ret;
3411                         } elseif ($complete) {
3412                                 // We are resharing something that isn't a DFRN or Diaspora post.
3413                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3414                                 return false;
3415                         }
3416                 } elseif (empty($reshared['guid']) && $complete) {
3417                         return false;
3418                 }
3419
3420                 $ret = [];
3421
3422                 if (!empty($reshared['profile']) && ($cid = Contact::getIdForURL($reshared['profile']))) {
3423                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $cid]);
3424                         if (!empty($contact['addr'])) {
3425                                 $ret['root_handle'] = $contact['addr'];
3426                         }
3427                 }
3428
3429                 if (empty($ret) && !$complete) {
3430                         return true;
3431                 }
3432
3433                 return $ret;
3434         }
3435
3436         /**
3437          * Create an event array
3438          *
3439          * @param integer $event_id The id of the event
3440          *
3441          * @return array with event data
3442          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3443          */
3444         private static function buildEvent($event_id)
3445         {
3446                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3447                 if (!DBA::isResult($r)) {
3448                         return [];
3449                 }
3450
3451                 $event = $r[0];
3452
3453                 $eventdata = [];
3454
3455                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3456                 if (!DBA::isResult($r)) {
3457                         return [];
3458                 }
3459
3460                 $user = $r[0];
3461
3462                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3463                 if (!DBA::isResult($r)) {
3464                         return [];
3465                 }
3466
3467                 $owner = $r[0];
3468
3469                 $eventdata['author'] = self::myHandle($owner);
3470
3471                 if ($event['guid']) {
3472                         $eventdata['guid'] = $event['guid'];
3473                 }
3474
3475                 $mask = DateTimeFormat::ATOM;
3476
3477                 /// @todo - establish "all day" events in Friendica
3478                 $eventdata["all_day"] = "false";
3479
3480                 $eventdata['timezone'] = 'UTC';
3481                 if (!$event['adjust'] && $user['timezone']) {
3482                         $eventdata['timezone'] = $user['timezone'];
3483                 }
3484
3485                 if ($event['start']) {
3486                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3487                 }
3488                 if ($event['finish'] && !$event['nofinish']) {
3489                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3490                 }
3491                 if ($event['summary']) {
3492                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3493                 }
3494                 if ($event['desc']) {
3495                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3496                 }
3497                 if ($event['location']) {
3498                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3499                         $coord = Map::getCoordinates($event['location']);
3500
3501                         $location = [];
3502                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3503                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3504                                 $location["lat"] = $coord['lat'];
3505                                 $location["lng"] = $coord['lon'];
3506                         } else {
3507                                 $location["lat"] = 0;
3508                                 $location["lng"] = 0;
3509                         }
3510                         $eventdata['location'] = $location;
3511                 }
3512
3513                 return $eventdata;
3514         }
3515
3516         /**
3517          * Create a post (status message or reshare)
3518          *
3519          * @param array $item  The item that will be exported
3520          * @param array $owner the array of the item owner
3521          *
3522          * @return array
3523          * 'type' -> Message type ("status_message" or "reshare")
3524          * 'message' -> Array of XML elements of the status
3525          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3526          * @throws \ImagickException
3527          */
3528         public static function buildStatus(array $item, array $owner)
3529         {
3530                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3531
3532                 $result = DI::cache()->get($cachekey);
3533                 if (!is_null($result)) {
3534                         return $result;
3535                 }
3536
3537                 $myaddr = self::myHandle($owner);
3538
3539                 $public = ($item["private"] == Item::PRIVATE ? "false" : "true");
3540                 $created = DateTimeFormat::utc($item['received'], DateTimeFormat::ATOM);
3541                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3542
3543                 // Detect a share element and do a reshare
3544                 if (($item['private'] != Item::PRIVATE) && ($ret = self::isReshare($item["body"]))) {
3545                         $message = ["author" => $myaddr,
3546                                         "guid" => $item["guid"],
3547                                         "created_at" => $created,
3548                                         "root_author" => $ret["root_handle"],
3549                                         "root_guid" => $ret["root_guid"],
3550                                         "provider_display_name" => $item["app"],
3551                                         "public" => $public];
3552
3553                         $type = "reshare";
3554                 } else {
3555                         $title = $item["title"];
3556                         $body = $item["body"];
3557
3558                         // Fetch the title from an attached link - if there is one
3559                         if (empty($item["title"]) && DI::pConfig()->get($owner['uid'], 'system', 'attach_link_title')) {
3560                                 $page_data = BBCode::getAttachmentData($item['body']);
3561                                 if (!empty($page_data['type']) && !empty($page_data['title']) && ($page_data['type'] == 'link')) {
3562                                         $title = $page_data['title'];
3563                                 }
3564                         }
3565
3566                         if ($item['author-link'] != $item['owner-link']) {
3567                                 require_once 'mod/share.php';
3568                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3569                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3570                         }
3571
3572                         // convert to markdown
3573                         $body = html_entity_decode(BBCode::toMarkdown($body));
3574
3575                         // Adding the title
3576                         if (strlen($title)) {
3577                                 $body = "### ".html_entity_decode($title)."\n\n".$body;
3578                         }
3579
3580                         if ($item["attach"]) {
3581                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3582                                 if ($cnt) {
3583                                         $body .= "\n".DI::l10n()->t("Attachments:")."\n";
3584                                         foreach ($matches as $mtch) {
3585                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3586                                         }
3587                                 }
3588                         }
3589
3590                         $location = [];
3591
3592                         if ($item["location"] != "")
3593                                 $location["address"] = $item["location"];
3594
3595                         if ($item["coord"] != "") {
3596                                 $coord = explode(" ", $item["coord"]);
3597                                 $location["lat"] = $coord[0];
3598                                 $location["lng"] = $coord[1];
3599                         }
3600
3601                         $message = ["author" => $myaddr,
3602                                         "guid" => $item["guid"],
3603                                         "created_at" => $created,
3604                                         "edited_at" => $edited,
3605                                         "public" => $public,
3606                                         "text" => $body,
3607                                         "provider_display_name" => $item["app"],
3608                                         "location" => $location];
3609
3610                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3611                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3612                                 unset($message["location"]);
3613                         }
3614
3615                         if ($item['event-id'] > 0) {
3616                                 $event = self::buildEvent($item['event-id']);
3617                                 if (count($event)) {
3618                                         $message['event'] = $event;
3619
3620                                         if (!empty($event['location']['address']) &&
3621                                                 !empty($event['location']['lat']) &&
3622                                                 !empty($event['location']['lng'])) {
3623                                                 $message['location'] = $event['location'];
3624                                         }
3625
3626                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3627                                         // $message['text'] = '';
3628                                 }
3629                         }
3630
3631                         $type = "status_message";
3632                 }
3633
3634                 $msg = ["type" => $type, "message" => $message];
3635
3636                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
3637
3638                 return $msg;
3639         }
3640
3641         private static function prependParentAuthorMention($body, $profile_url)
3642         {
3643                 $profile = Contact::getDetailsByURL($profile_url);
3644                 if (!empty($profile['addr'])
3645                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3646                         && !strstr($body, $profile['addr'])
3647                         && !strstr($body, $profile_url)
3648                 ) {
3649                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3650                 }
3651
3652                 return $body;
3653         }
3654
3655         /**
3656          * Sends a post
3657          *
3658          * @param array $item         The item that will be exported
3659          * @param array $owner        the array of the item owner
3660          * @param array $contact      Target of the communication
3661          * @param bool  $public_batch Is it a public post?
3662          *
3663          * @return int The result of the transmission
3664          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3665          * @throws \ImagickException
3666          */
3667         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3668         {
3669                 $status = self::buildStatus($item, $owner);
3670
3671                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3672         }
3673
3674         /**
3675          * Creates a "like" object
3676          *
3677          * @param array $item  The item that will be exported
3678          * @param array $owner the array of the item owner
3679          *
3680          * @return array The data for a "like"
3681          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3682          */
3683         private static function constructLike(array $item, array $owner)
3684         {
3685                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3686                 if (!DBA::isResult($parent)) {
3687                         return false;
3688                 }
3689
3690                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3691                 $positive = null;
3692                 if ($item['verb'] === Activity::LIKE) {
3693                         $positive = "true";
3694                 } elseif ($item['verb'] === Activity::DISLIKE) {
3695                         $positive = "false";
3696                 }
3697
3698                 return(["author" => self::myHandle($owner),
3699                                 "guid" => $item["guid"],
3700                                 "parent_guid" => $parent["guid"],
3701                                 "parent_type" => $target_type,
3702                                 "positive" => $positive,
3703                                 "author_signature" => ""]);
3704         }
3705
3706         /**
3707          * Creates an "EventParticipation" object
3708          *
3709          * @param array $item  The item that will be exported
3710          * @param array $owner the array of the item owner
3711          *
3712          * @return array The data for an "EventParticipation"
3713          * @throws \Exception
3714          */
3715         private static function constructAttend(array $item, array $owner)
3716         {
3717                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3718                 if (!DBA::isResult($parent)) {
3719                         return false;
3720                 }
3721
3722                 switch ($item['verb']) {
3723                         case Activity::ATTEND:
3724                                 $attend_answer = 'accepted';
3725                                 break;
3726                         case Activity::ATTENDNO:
3727                                 $attend_answer = 'declined';
3728                                 break;
3729                         case Activity::ATTENDMAYBE:
3730                                 $attend_answer = 'tentative';
3731                                 break;
3732                         default:
3733                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3734                                 return false;
3735                 }
3736
3737                 return(["author" => self::myHandle($owner),
3738                                 "guid" => $item["guid"],
3739                                 "parent_guid" => $parent["guid"],
3740                                 "status" => $attend_answer,
3741                                 "author_signature" => ""]);
3742         }
3743
3744         /**
3745          * Creates the object for a comment
3746          *
3747          * @param array $item  The item that will be exported
3748          * @param array $owner the array of the item owner
3749          *
3750          * @return array|false The data for a comment
3751          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3752          */
3753         private static function constructComment(array $item, array $owner)
3754         {
3755                 $cachekey = "diaspora:constructComment:".$item['guid'];
3756
3757                 $result = DI::cache()->get($cachekey);
3758                 if (!is_null($result)) {
3759                         return $result;
3760                 }
3761
3762                 $toplevel_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['id' => $item["parent"], 'parent' => $item["parent"]]);
3763                 if (!DBA::isResult($toplevel_item)) {
3764                         Logger::error('Missing parent conversation item', ['parent' => $item["parent"]]);
3765                         return false;
3766                 }
3767
3768                 $thread_parent_item = $toplevel_item;
3769                 if ($item['thr-parent'] != $item['parent-uri']) {
3770                         $thread_parent_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3771                 }
3772
3773                 $body = $item["body"];
3774
3775                 // The replied to autor mention is prepended for clarity if:
3776                 // - Item replied isn't yours
3777                 // - Item is public or explicit mentions are disabled
3778                 // - Implicit mentions are enabled
3779                 if (
3780                         $item['author-id'] != $thread_parent_item['author-id']
3781                         && (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3782                         && !DI::config()->get('system', 'disable_implicit_mentions')
3783                 ) {
3784                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3785                 }
3786
3787                 $text = html_entity_decode(BBCode::toMarkdown($body));
3788                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3789                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3790
3791                 $comment = [
3792                         "author"      => self::myHandle($owner),
3793                         "guid"        => $item["guid"],
3794                         "created_at"  => $created,
3795                         "edited_at"   => $edited,
3796                         "parent_guid" => $toplevel_item["guid"],
3797                         "text"        => $text,
3798                         "author_signature" => ""
3799                 ];
3800
3801                 // Send the thread parent guid only if it is a threaded comment
3802                 if ($item['thr-parent'] != $item['parent-uri']) {
3803                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3804                 }
3805
3806                 DI::cache()->set($cachekey, $comment, Duration::QUARTER_HOUR);
3807
3808                 return($comment);
3809         }
3810
3811         /**
3812          * Send a like or a comment
3813          *
3814          * @param array $item         The item that will be exported
3815          * @param array $owner        the array of the item owner
3816          * @param array $contact      Target of the communication
3817          * @param bool  $public_batch Is it a public post?
3818          *
3819          * @return int The result of the transmission
3820          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3821          * @throws \ImagickException
3822          */
3823         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3824         {
3825                 if (in_array($item['verb'], [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE])) {
3826                         $message = self::constructAttend($item, $owner);
3827                         $type = "event_participation";
3828                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3829                         $message = self::constructLike($item, $owner);
3830                         $type = "like";
3831                 } elseif (!in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
3832                         $message = self::constructComment($item, $owner);
3833                         $type = "comment";
3834                 }
3835
3836                 if (empty($message)) {
3837                         return false;
3838                 }
3839
3840                 $message["author_signature"] = self::signature($owner, $message);
3841
3842                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3843         }
3844
3845         /**
3846          * Creates a message from a signature record entry
3847          *
3848          * @param array $item The item that will be exported
3849          * @return array The message
3850          */
3851         private static function messageFromSignature(array $item)
3852         {
3853                 // Split the signed text
3854                 $signed_parts = explode(";", $item['signed_text']);
3855
3856                 if ($item["deleted"]) {
3857                         $message = ["author" => $item['signer'],
3858                                         "target_guid" => $signed_parts[0],
3859                                         "target_type" => $signed_parts[1]];
3860                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3861                         $message = ["author" => $signed_parts[4],
3862                                         "guid" => $signed_parts[1],
3863                                         "parent_guid" => $signed_parts[3],
3864                                         "parent_type" => $signed_parts[2],
3865                                         "positive" => $signed_parts[0],
3866                                         "author_signature" => $item['signature'],
3867                                         "parent_author_signature" => ""];
3868                 } else {
3869                         // Remove the comment guid
3870                         $guid = array_shift($signed_parts);
3871
3872                         // Remove the parent guid
3873                         $parent_guid = array_shift($signed_parts);
3874
3875                         // Remove the handle
3876                         $handle = array_pop($signed_parts);
3877
3878                         $message = [
3879                                 "author" => $handle,
3880                                 "guid" => $guid,
3881                                 "parent_guid" => $parent_guid,
3882                                 "text" => implode(";", $signed_parts),
3883                                 "author_signature" => $item['signature'],
3884                                 "parent_author_signature" => ""
3885                         ];
3886                 }
3887                 return $message;
3888         }
3889
3890         /**
3891          * Relays messages (like, comment, retraction) to other servers if we are the thread owner
3892          *
3893          * @param array $item         The item that will be exported
3894          * @param array $owner        the array of the item owner
3895          * @param array $contact      Target of the communication
3896          * @param bool  $public_batch Is it a public post?
3897          *
3898          * @return int The result of the transmission
3899          * @throws \Exception
3900          */
3901         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3902         {
3903                 if ($item["deleted"]) {
3904                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3905                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3906                         $type = "like";
3907                 } else {
3908                         $type = "comment";
3909                 }
3910
3911                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3912
3913                 // Old way - is used by the internal Friendica functions
3914                 /// @todo Change all signatur storing functions to the new format
3915                 if ($item['signed_text'] && $item['signature'] && $item['signer']) {
3916                         $message = self::messageFromSignature($item);
3917                 } else {// New way
3918                         $msg = json_decode($item['signed_text'], true);
3919
3920                         $message = [];
3921                         if (is_array($msg)) {
3922                                 foreach ($msg as $field => $data) {
3923                                         if (!$item["deleted"]) {
3924                                                 if ($field == "diaspora_handle") {
3925                                                         $field = "author";
3926                                                 }
3927                                                 if ($field == "target_type") {
3928                                                         $field = "parent_type";
3929                                                 }
3930                                         }
3931
3932                                         $message[$field] = $data;
3933                                 }
3934                         } else {
3935                                 Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3936                         }
3937                 }
3938
3939                 $message["parent_author_signature"] = self::signature($owner, $message);
3940
3941                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
3942
3943                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3944         }
3945
3946         /**
3947          * Sends a retraction (deletion) of a message, like or comment
3948          *
3949          * @param array $item         The item that will be exported
3950          * @param array $owner        the array of the item owner
3951          * @param array $contact      Target of the communication
3952          * @param bool  $public_batch Is it a public post?
3953          * @param bool  $relay        Is the retraction transmitted from a relay?
3954          *
3955          * @return int The result of the transmission
3956          * @throws \Exception
3957          */
3958         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3959         {
3960                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3961
3962                 $msg_type = "retraction";
3963
3964                 if ($item['id'] == $item['parent']) {
3965                         $target_type = "Post";
3966                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3967                         $target_type = "Like";
3968                 } else {
3969                         $target_type = "Comment";
3970                 }
3971
3972                 $message = ["author" => $itemaddr,
3973                                 "target_guid" => $item['guid'],
3974                                 "target_type" => $target_type];
3975
3976                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
3977
3978                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3979         }
3980
3981         /**
3982          * Sends a mail
3983          *
3984          * @param array $item    The item that will be exported
3985          * @param array $owner   The owner
3986          * @param array $contact Target of the communication
3987          *
3988          * @return int The result of the transmission
3989          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3990          * @throws \ImagickException
3991          */
3992         public static function sendMail(array $item, array $owner, array $contact)
3993         {
3994                 $myaddr = self::myHandle($owner);
3995
3996                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
3997                 if (!DBA::isResult($cnv)) {
3998                         Logger::log("conversation not found.");
3999                         return;
4000                 }
4001
4002                 $body = BBCode::toMarkdown($item["body"]);
4003                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4004
4005                 $msg = [
4006                         "author" => $myaddr,
4007                         "guid" => $item["guid"],
4008                         "conversation_guid" => $cnv["guid"],
4009                         "text" => $body,
4010                         "created_at" => $created,
4011                 ];
4012
4013                 if ($item["reply"]) {
4014                         $message = $msg;
4015                         $type = "message";
4016                 } else {
4017                         $message = [
4018                                 "author" => $cnv["creator"],
4019                                 "guid" => $cnv["guid"],
4020                                 "subject" => $cnv["subject"],
4021                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4022                                 "participants" => $cnv["recips"],
4023                                 "message" => $msg
4024                         ];
4025
4026                         $type = "conversation";
4027                 }
4028
4029                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4030         }
4031
4032         /**
4033          * Split a name into first name and last name
4034          *
4035          * @param string $name The name
4036          *
4037          * @return array The array with "first" and "last"
4038          */
4039         public static function splitName($name) {
4040                 $name = trim($name);
4041
4042                 // Is the name longer than 64 characters? Then cut the rest of it.
4043                 if (strlen($name) > 64) {
4044                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4045                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4046                         } else {
4047                                 $name = substr($name, 0, 64);
4048                         }
4049                 }
4050
4051                 // Take the first word as first name
4052                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4053                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4054                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4055                         return ['first' => $first, 'last' => $last];
4056                 }
4057
4058                 // Take the last word as last name
4059                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4060                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4061
4062                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4063                         return ['first' => $first, 'last' => $last];
4064                 }
4065
4066                 // Take the first 32 characters if there is no space in the first 32 characters
4067                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4068                         $first = substr($name, 0, 32);
4069                         $last = substr($name, 32);
4070                         return ['first' => $first, 'last' => $last];
4071                 }
4072
4073                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4074                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4075
4076                 // Check if the last name is longer than 32 characters
4077                 if (strlen($last) > 32) {
4078                         if (strpos($last, ' ') <= 32) {
4079                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4080                         } else {
4081                                 $last = substr($last, 0, 32);
4082                         }
4083                 }
4084
4085                 return ['first' => $first, 'last' => $last];
4086         }
4087
4088         /**
4089          * Create profile data
4090          *
4091          * @param int $uid The user id
4092          *
4093          * @return array The profile data
4094          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4095          */
4096         private static function createProfileData($uid)
4097         {
4098                 $r = q(
4099                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4100                         FROM `profile`
4101                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4102                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4103                         WHERE `user`.`uid` = %d AND `contact`.`self` LIMIT 1",
4104                         intval($uid)
4105                 );
4106
4107                 if (!$r) {
4108                         return [];
4109                 }
4110
4111                 $profile = $r[0];
4112                 $handle = $profile["addr"];
4113
4114                 $split_name = self::splitName($profile['name']);
4115                 $first = $split_name['first'];
4116                 $last = $split_name['last'];
4117
4118                 $large = DI::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4119                 $medium = DI::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4120                 $small = DI::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4121                 $searchable = ($profile['net-publish'] ? 'true' : 'false');
4122
4123                 $dob = null;
4124                 $about = null;
4125                 $location = null;
4126                 $tags = null;
4127                 if ($searchable === 'true') {
4128                         $dob = '';
4129
4130                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4131                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4132                                 if ($year < 1004) {
4133                                         $year = 1004;
4134                                 }
4135                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4136                         }
4137
4138                         $about = BBCode::toMarkdown($profile['about']);
4139
4140                         $location = Profile::formatLocation($profile);
4141                         $tags = '';
4142                         if ($profile['pub_keywords']) {
4143                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4144                                 $kw = str_replace('  ', ' ', $kw);
4145                                 $arr = explode(' ', $kw);
4146                                 if (count($arr)) {
4147                                         for ($x = 0; $x < 5; $x ++) {
4148                                                 if (!empty($arr[$x])) {
4149                                                         $tags .= '#'. trim($arr[$x]) .' ';
4150                                                 }
4151                                         }
4152                                 }
4153                         }
4154                         $tags = trim($tags);
4155                 }
4156
4157                 return ["author" => $handle,
4158                                 "first_name" => $first,
4159                                 "last_name" => $last,
4160                                 "image_url" => $large,
4161                                 "image_url_medium" => $medium,
4162                                 "image_url_small" => $small,
4163                                 "birthday" => $dob,
4164                                 "bio" => $about,
4165                                 "location" => $location,
4166                                 "searchable" => $searchable,
4167                                 "nsfw" => "false",
4168                                 "tag_string" => $tags];
4169         }
4170
4171         /**
4172          * Sends profile data
4173          *
4174          * @param int  $uid    The user id
4175          * @param bool $recips optional, default false
4176          * @return void
4177          * @throws \Exception
4178          */
4179         public static function sendProfile($uid, $recips = false)
4180         {
4181                 if (!$uid) {
4182                         return;
4183                 }
4184
4185                 $owner = User::getOwnerDataById($uid);
4186                 if (!$owner) {
4187                         return;
4188                 }
4189
4190                 if (!$recips) {
4191                         $recips = q(
4192                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4193                                 AND `uid` = %d AND `rel` != %d",
4194                                 DBA::escape(Protocol::DIASPORA),
4195                                 intval($uid),
4196                                 intval(Contact::SHARING)
4197                         );
4198                 }
4199
4200                 if (!$recips) {
4201                         return;
4202                 }
4203
4204                 $message = self::createProfileData($uid);
4205
4206                 // @ToDo Split this into single worker jobs
4207                 foreach ($recips as $recip) {
4208                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4209                         self::buildAndTransmit($owner, $recip, "profile", $message);
4210                 }
4211         }
4212
4213         /**
4214          * Creates the signature for likes that are created on our system
4215          *
4216          * @param integer $uid  The user of that comment
4217          * @param array   $item Item array
4218          *
4219          * @return array Signed content
4220          * @throws \Exception
4221          */
4222         public static function createLikeSignature($uid, array $item)
4223         {
4224                 $owner = User::getOwnerDataById($uid);
4225                 if (empty($owner)) {
4226                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4227                         return false;
4228                 }
4229
4230                 if (!in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4231                         return false;
4232                 }
4233
4234                 $message = self::constructLike($item, $owner);
4235                 if ($message === false) {
4236                         return false;
4237                 }
4238
4239                 $message["author_signature"] = self::signature($owner, $message);
4240
4241                 return $message;
4242         }
4243
4244         /**
4245          * Creates the signature for Comments that are created on our system
4246          *
4247          * @param integer $uid  The user of that comment
4248          * @param array   $item Item array
4249          *
4250          * @return array Signed content
4251          * @throws \Exception
4252          */
4253         public static function createCommentSignature($uid, array $item)
4254         {
4255                 $owner = User::getOwnerDataById($uid);
4256                 if (empty($owner)) {
4257                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4258                         return false;
4259                 }
4260
4261                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4262                 $item['thr-parent'] = $item['parent-uri'];
4263
4264                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4265                 if (!DBA::isResult($parent)) {
4266                         return;
4267                 }
4268
4269                 $item['parent-uri'] = $parent['parent-uri'];
4270
4271                 $message = self::constructComment($item, $owner);
4272                 if ($message === false) {
4273                         return false;
4274                 }
4275
4276                 $message["author_signature"] = self::signature($owner, $message);
4277
4278                 return $message;
4279         }
4280 }