src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @file src/Protocol/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  *
   6  * The new protocol is described here: http://diaspora.github.io/diaspora_federation/index.html
   7  * This implementation here interprets the old and the new protocol and sends the new one.
   8  * In the future we will remove most stuff from "validPosting" and interpret only the new protocol.
   9  */
  10
  11 namespace Friendica\Protocol;
  12
  13 use Friendica\Content\Feature;
  14 use Friendica\Content\Text\BBCode;
  15 use Friendica\Content\Text\Markdown;
  16 use Friendica\Core\Cache;
  17 use Friendica\Core\Config;
  18 use Friendica\Core\L10n;
  19 use Friendica\Core\Logger;
  20 use Friendica\Core\PConfig;
  21 use Friendica\Core\Protocol;
  22 use Friendica\Core\System;
  23 use Friendica\Core\Worker;
  24 use Friendica\Database\DBA;
  25 use Friendica\Model\Contact;
  26 use Friendica\Model\Conversation;
  27 use Friendica\Model\GContact;
  28 use Friendica\Model\Group;
  29 use Friendica\Model\Item;
  30 use Friendica\Model\Profile;
  31 use Friendica\Model\Queue;
  32 use Friendica\Model\User;
  33 use Friendica\Network\Probe;
  34 use Friendica\Util\Crypto;
  35 use Friendica\Util\DateTimeFormat;
  36 use Friendica\Util\Map;
  37 use Friendica\Util\Network;
  38 use Friendica\Util\Strings;
  39 use Friendica\Util\XML;
  40 use SimpleXMLElement;
  41
  42 /**
  43  * @brief This class contain functions to create and send Diaspora XML files
  44  *
  45  */
  46 class Diaspora
  47 {
  48         /**
  49          * @brief Return a list of relay servers
  50          *
  51          * The list contains not only the official relays but also servers that we serve directly
  52          *
  53          * @param integer $item_id  The id of the item that is sent
  54          * @param array   $contacts The previously fetched contacts
  55          *
  56          * @return array of relay servers
  57          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  58          */
  59         public static function relayList($item_id, array $contacts = [])
  60         {
  61                 $serverlist = [];
  62
  63                 // Fetching relay servers
  64                 $serverdata = Config::get("system", "relay_server");
  65
  66                 if (!empty($serverdata)) {
  67                         $servers = explode(",", $serverdata);
  68                         foreach ($servers as $server) {
  69                                 $serverlist[$server] = trim($server);
  70                         }
  71                 }
  72
  73                 if (Config::get("system", "relay_directly", false)) {
  74                         // We distribute our stuff based on the parent to ensure that the thread will be complete
  75                         $parent = Item::selectFirst(['parent'], ['id' => $item_id]);
  76                         if (!DBA::isResult($parent)) {
  77                                 return;
  78                         }
  79
  80                         // Servers that want to get all content
  81                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  82                         while ($server = DBA::fetch($servers)) {
  83                                 $serverlist[$server['url']] = $server['url'];
  84                         }
  85
  86                         // All tags of the current post
  87                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
  88                         $tags = DBA::select('term', ['term'], $condition);
  89                         $taglist = [];
  90                         while ($tag = DBA::fetch($tags)) {
  91                                 $taglist[] = $tag['term'];
  92                         }
  93
  94                         // All servers who wants content with this tag
  95                         $tagserverlist = [];
  96                         if (!empty($taglist)) {
  97                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  98                                 while ($server = DBA::fetch($tagserver)) {
  99                                         $tagserverlist[] = $server['gserver-id'];
 100                                 }
 101                         }
 102
 103                         // All adresses with the given id
 104                         if (!empty($tagserverlist)) {
 105                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 106                                 while ($server = DBA::fetch($servers)) {
 107                                         $serverlist[$server['url']] = $server['url'];
 108                                 }
 109                         }
 110                 }
 111
 112                 // Now we are collecting all relay contacts
 113                 foreach ($serverlist as $server_url) {
 114                         // We don't send messages to ourselves
 115                         if (Strings::compareLink($server_url, System::baseUrl())) {
 116                                 continue;
 117                         }
 118                         $contact = self::getRelayContact($server_url);
 119                         if (is_bool($contact)) {
 120                                 continue;
 121                         }
 122
 123                         $exists = false;
 124                         foreach ($contacts as $entry) {
 125                                 if ($entry['batch'] == $contact['batch']) {
 126                                         $exists = true;
 127                                 }
 128                         }
 129
 130                         if (!$exists) {
 131                                 $contacts[] = $contact;
 132                         }
 133                 }
 134
 135                 return $contacts;
 136         }
 137
 138         /**
 139          * @brief Return a contact for a given server address or creates a dummy entry
 140          *
 141          * @param string $server_url The url of the server
 142          * @return array with the contact
 143          * @throws \Exception
 144          */
 145         private static function getRelayContact($server_url)
 146         {
 147                 $fields = ['batch', 'id', 'name', 'network', 'archive', 'blocked'];
 148
 149                 // Fetch the relay contact
 150                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 151                         'contact-type' => Contact::TYPE_RELAY];
 152                 $contact = DBA::selectFirst('contact', $fields, $condition);
 153
 154                 if (DBA::isResult($contact)) {
 155                         if ($contact['archive'] || $contact['blocked']) {
 156                                 return false;
 157                         }
 158                         return $contact;
 159                 } else {
 160                         self::setRelayContact($server_url);
 161
 162                         $contact = DBA::selectFirst('contact', $fields, $condition);
 163                         if (DBA::isResult($contact)) {
 164                                 return $contact;
 165                         }
 166                 }
 167
 168                 // It should never happen that we arrive here
 169                 return [];
 170         }
 171
 172         /**
 173          * @brief Update or insert a relay contact
 174          *
 175          * @param string $server_url     The url of the server
 176          * @param array  $network_fields Optional network specific fields
 177          * @throws \Exception
 178          */
 179         public static function setRelayContact($server_url, array $network_fields = [])
 180         {
 181                 $fields = ['created' => DateTimeFormat::utcNow(),
 182                         'name' => 'relay', 'nick' => 'relay',
 183                         'url' => $server_url, 'network' => Protocol::DIASPORA,
 184                         'batch' => $server_url . '/receive/public',
 185                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 186                         'pending' => false, 'writable' => true];
 187
 188                 $fields = array_merge($fields, $network_fields);
 189
 190                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 191                         'contact-type' => Contact::TYPE_RELAY];
 192
 193                 if (DBA::exists('contact', $condition)) {
 194                         unset($fields['created']);
 195                 }
 196
 197                 DBA::update('contact', $fields, $condition, true);
 198         }
 199
 200         /**
 201          * @brief Return a list of participating contacts for a thread
 202          *
 203          * This is used for the participation feature.
 204          * One of the parameters is a contact array.
 205          * This is done to avoid duplicates.
 206          *
 207          * @param integer $thread   The id of the thread
 208          * @param array   $contacts The previously fetched contacts
 209          *
 210          * @return array of relay servers
 211          * @throws \Exception
 212          */
 213         public static function participantsForThread($thread, array $contacts)
 214         {
 215                 $r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
 216                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 217                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 218                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 219                                 WHERE `participation`.`iid` = ?", $thread);
 220
 221                 while ($contact = DBA::fetch($r)) {
 222                         if (!empty($contact['fnetwork'])) {
 223                                 $contact['network'] = $contact['fnetwork'];
 224                         }
 225                         unset($contact['fnetwork']);
 226
 227                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 228                                 $contact['batch'] = $contact['fbatch'];
 229                         }
 230                         unset($contact['fbatch']);
 231
 232                         $exists = false;
 233                         foreach ($contacts as $entry) {
 234                                 if ($entry['batch'] == $contact['batch']) {
 235                                         $exists = true;
 236                                 }
 237                         }
 238
 239                         if (!$exists) {
 240                                 $contacts[] = $contact;
 241                         }
 242                 }
 243                 DBA::close($r);
 244
 245                 return $contacts;
 246         }
 247
 248         /**
 249          * @brief repairs a signature that was double encoded
 250          *
 251          * The function is unused at the moment. It was copied from the old implementation.
 252          *
 253          * @param string  $signature The signature
 254          * @param string  $handle    The handle of the signature owner
 255          * @param integer $level     This value is only set inside this function to avoid endless loops
 256          *
 257          * @return string the repaired signature
 258          * @throws \Exception
 259          */
 260         private static function repairSignature($signature, $handle = "", $level = 1)
 261         {
 262                 if ($signature == "") {
 263                         return ($signature);
 264                 }
 265
 266                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 267                         $signature = base64_decode($signature);
 268                         Logger::log("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, Logger::DEBUG);
 269
 270                         // Do a recursive call to be able to fix even multiple levels
 271                         if ($level < 10) {
 272                                 $signature = self::repairSignature($signature, $handle, ++$level);
 273                         }
 274                 }
 275
 276                 return($signature);
 277         }
 278
 279         /**
 280          * @brief verify the envelope and return the verified data
 281          *
 282          * @param string $envelope The magic envelope
 283          *
 284          * @return string verified data
 285          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 286          * @throws \ImagickException
 287          */
 288         private static function verifyMagicEnvelope($envelope)
 289         {
 290                 $basedom = XML::parseString($envelope);
 291
 292                 if (!is_object($basedom)) {
 293                         Logger::log("Envelope is no XML file");
 294                         return false;
 295                 }
 296
 297                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 298
 299                 if (sizeof($children) == 0) {
 300                         Logger::log("XML has no children");
 301                         return false;
 302                 }
 303
 304                 $handle = "";
 305
 306                 $data = Strings::base64UrlDecode($children->data);
 307                 $type = $children->data->attributes()->type[0];
 308
 309                 $encoding = $children->encoding;
 310
 311                 $alg = $children->alg;
 312
 313                 $sig = Strings::base64UrlDecode($children->sig);
 314                 $key_id = $children->sig->attributes()->key_id[0];
 315                 if ($key_id != "") {
 316                         $handle = Strings::base64UrlDecode($key_id);
 317                 }
 318
 319                 $b64url_data = Strings::base64UrlEncode($data);
 320                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 321
 322                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 323
 324                 if ($handle == '') {
 325                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 326                         return false;
 327                 }
 328
 329                 $key = self::key($handle);
 330                 if ($key == '') {
 331                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 332                         return false;
 333                 }
 334
 335                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 336                 if (!$verify) {
 337                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 338                         return false;
 339                 }
 340
 341                 return $data;
 342         }
 343
 344         /**
 345          * @brief encrypts data via AES
 346          *
 347          * @param string $key  The AES key
 348          * @param string $iv   The IV (is used for CBC encoding)
 349          * @param string $data The data that is to be encrypted
 350          *
 351          * @return string encrypted data
 352          */
 353         private static function aesEncrypt($key, $iv, $data)
 354         {
 355                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 356         }
 357
 358         /**
 359          * @brief decrypts data via AES
 360          *
 361          * @param string $key       The AES key
 362          * @param string $iv        The IV (is used for CBC encoding)
 363          * @param string $encrypted The encrypted data
 364          *
 365          * @return string decrypted data
 366          */
 367         private static function aesDecrypt($key, $iv, $encrypted)
 368         {
 369                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 370         }
 371
 372         /**
 373          * @brief: Decodes incoming Diaspora message in the new format
 374          *
 375          * @param array   $importer Array of the importer user
 376          * @param string  $raw      raw post message
 377          * @param boolean $no_exit  Don't do an http exit on error
 378          *
 379          * @return array
 380          * 'message' -> decoded Diaspora XML message
 381          * 'author' -> author diaspora handle
 382          * 'key' -> author public key (converted to pkcs#8)
 383          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 384          * @throws \ImagickException
 385          */
 386         public static function decodeRaw(array $importer, $raw, $no_exit = false)
 387         {
 388                 $data = json_decode($raw);
 389
 390                 // Is it a private post? Then decrypt the outer Salmon
 391                 if (is_object($data)) {
 392                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 393                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 394
 395                         $outer_key_bundle = '';
 396                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 397                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 398
 399                         if (!is_object($j_outer_key_bundle)) {
 400                                 Logger::log('Outer Salmon did not verify. Discarding.');
 401                                 if ($no_exit) {
 402                                         return false;
 403                                 } else {
 404                                         System::httpExit(400);
 405                                 }
 406                         }
 407
 408                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 409                         $outer_key = base64_decode($j_outer_key_bundle->key);
 410
 411                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 412                 } else {
 413                         $xml = $raw;
 414                 }
 415
 416                 $basedom = XML::parseString($xml);
 417
 418                 if (!is_object($basedom)) {
 419                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 420                         if ($no_exit) {
 421                                 return false;
 422                         } else {
 423                                 System::httpExit(400);
 424                         }
 425                 }
 426
 427                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 428
 429                 // Not sure if this cleaning is needed
 430                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 431
 432                 // Build the signed data
 433                 $type = $base->data[0]->attributes()->type[0];
 434                 $encoding = $base->encoding;
 435                 $alg = $base->alg;
 436                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 437
 438                 // This is the signature
 439                 $signature = Strings::base64UrlDecode($base->sig);
 440
 441                 // Get the senders' public key
 442                 $key_id = $base->sig[0]->attributes()->key_id[0];
 443                 $author_addr = base64_decode($key_id);
 444                 if ($author_addr == '') {
 445                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 446                         if ($no_exit) {
 447                                 return false;
 448                         } else {
 449                                 System::httpExit(400);
 450                         }
 451                 }
 452
 453                 $key = self::key($author_addr);
 454                 if ($key == '') {
 455                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 456                         if ($no_exit) {
 457                                 return false;
 458                         } else {
 459                                 System::httpExit(400);
 460                         }
 461                 }
 462
 463                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 464                 if (!$verify) {
 465                         Logger::log('Message did not verify. Discarding.');
 466                         if ($no_exit) {
 467                                 return false;
 468                         } else {
 469                                 System::httpExit(400);
 470                         }
 471                 }
 472
 473                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 474                                 'author' => XML::unescape($author_addr),
 475                                 'key' => (string)$key];
 476         }
 477
 478         /**
 479          * @brief: Decodes incoming Diaspora message in the deprecated format
 480          *
 481          * @param array  $importer Array of the importer user
 482          * @param string $xml      urldecoded Diaspora salmon
 483          *
 484          * @return array
 485          * 'message' -> decoded Diaspora XML message
 486          * 'author' -> author diaspora handle
 487          * 'key' -> author public key (converted to pkcs#8)
 488          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 489          * @throws \ImagickException
 490          */
 491         public static function decode(array $importer, $xml)
 492         {
 493                 $public = false;
 494                 $basedom = XML::parseString($xml);
 495
 496                 if (!is_object($basedom)) {
 497                         Logger::log("XML is not parseable.");
 498                         return false;
 499                 }
 500                 $children = $basedom->children('https://joindiaspora.com/protocol');
 501
 502                 $inner_aes_key = null;
 503                 $inner_iv = null;
 504
 505                 if ($children->header) {
 506                         $public = true;
 507                         $author_link = str_replace('acct:', '', $children->header->author_id);
 508                 } else {
 509                         // This happens with posts from a relais
 510                         if (!$importer) {
 511                                 Logger::log("This is no private post in the old format", Logger::DEBUG);
 512                                 return false;
 513                         }
 514
 515                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 516
 517                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 518                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 519
 520                         $outer_key_bundle = '';
 521                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 522
 523                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 524
 525                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 526                         $outer_key = base64_decode($j_outer_key_bundle->key);
 527
 528                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 529
 530                         Logger::log('decrypted: '.$decrypted, Logger::DEBUG);
 531                         $idom = XML::parseString($decrypted);
 532
 533                         $inner_iv = base64_decode($idom->iv);
 534                         $inner_aes_key = base64_decode($idom->aes_key);
 535
 536                         $author_link = str_replace('acct:', '', $idom->author_id);
 537                 }
 538
 539                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 540
 541                 // figure out where in the DOM tree our data is hiding
 542
 543                 $base = null;
 544                 if ($dom->provenance->data) {
 545                         $base = $dom->provenance;
 546                 } elseif ($dom->env->data) {
 547                         $base = $dom->env;
 548                 } elseif ($dom->data) {
 549                         $base = $dom;
 550                 }
 551
 552                 if (!$base) {
 553                         Logger::log('unable to locate salmon data in xml');
 554                         System::httpExit(400);
 555                 }
 556
 557
 558                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 559                 $signature = Strings::base64UrlDecode($base->sig);
 560
 561                 // unpack the  data
 562
 563                 // strip whitespace so our data element will return to one big base64 blob
 564                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 565
 566
 567                 // stash away some other stuff for later
 568
 569                 $type = $base->data[0]->attributes()->type[0];
 570                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 571                 $encoding = $base->encoding;
 572                 $alg = $base->alg;
 573
 574
 575                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 576
 577
 578                 // decode the data
 579                 $data = Strings::base64UrlDecode($data);
 580
 581
 582                 if ($public) {
 583                         $inner_decrypted = $data;
 584                 } else {
 585                         // Decode the encrypted blob
 586                         $inner_encrypted = base64_decode($data);
 587                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 588                 }
 589
 590                 if (!$author_link) {
 591                         Logger::log('Could not retrieve author URI.');
 592                         System::httpExit(400);
 593                 }
 594                 // Once we have the author URI, go to the web and try to find their public key
 595                 // (first this will look it up locally if it is in the fcontact cache)
 596                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 597
 598                 Logger::log('Fetching key for '.$author_link);
 599                 $key = self::key($author_link);
 600
 601                 if (!$key) {
 602                         Logger::log('Could not retrieve author key.');
 603                         System::httpExit(400);
 604                 }
 605
 606                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 607
 608                 if (!$verify) {
 609                         Logger::log('Message did not verify. Discarding.');
 610                         System::httpExit(400);
 611                 }
 612
 613                 Logger::log('Message verified.');
 614
 615                 return ['message' => (string)$inner_decrypted,
 616                                 'author' => XML::unescape($author_link),
 617                                 'key' => (string)$key];
 618         }
 619
 620
 621         /**
 622          * @brief Dispatches public messages and find the fitting receivers
 623          *
 624          * @param array $msg The post that will be dispatched
 625          *
 626          * @return int The message id of the generated message, "true" or "false" if there was an error
 627          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 628          * @throws \ImagickException
 629          */
 630         public static function dispatchPublic($msg)
 631         {
 632                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 633                 if (!$enabled) {
 634                         Logger::log("diaspora is disabled");
 635                         return false;
 636                 }
 637
 638                 if (!($fields = self::validPosting($msg))) {
 639                         Logger::log("Invalid posting");
 640                         return false;
 641                 }
 642
 643                 $importer = ["uid" => 0, "page-flags" => User::PAGE_FLAGS_FREELOVE];
 644                 $success = self::dispatch($importer, $msg, $fields);
 645
 646                 return $success;
 647         }
 648
 649         /**
 650          * @brief Dispatches the different message types to the different functions
 651          *
 652          * @param array            $importer Array of the importer user
 653          * @param array            $msg      The post that will be dispatched
 654          * @param SimpleXMLElement $fields   SimpleXML object that contains the message
 655          *
 656          * @return int The message id of the generated message, "true" or "false" if there was an error
 657          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 658          * @throws \ImagickException
 659          */
 660         public static function dispatch(array $importer, $msg, SimpleXMLElement $fields = null)
 661         {
 662                 // The sender is the handle of the contact that sent the message.
 663                 // This will often be different with relayed messages (for example "like" and "comment")
 664                 $sender = $msg["author"];
 665
 666                 // This is only needed for private postings since this is already done for public ones before
 667                 if (is_null($fields)) {
 668                         $private = true;
 669                         if (!($fields = self::validPosting($msg))) {
 670                                 Logger::log("Invalid posting");
 671                                 return false;
 672                         }
 673                 } else {
 674                         $private = false;
 675                 }
 676
 677                 $type = $fields->getName();
 678
 679                 Logger::log("Received message type ".$type." from ".$sender." for user ".$importer["uid"], Logger::DEBUG);
 680
 681                 switch ($type) {
 682                         case "account_migration":
 683                                 if (!$private) {
 684                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 685                                         return false;
 686                                 }
 687                                 return self::receiveAccountMigration($importer, $fields);
 688
 689                         case "account_deletion":
 690                                 return self::receiveAccountDeletion($fields);
 691
 692                         case "comment":
 693                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 694
 695                         case "contact":
 696                                 if (!$private) {
 697                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 698                                         return false;
 699                                 }
 700                                 return self::receiveContactRequest($importer, $fields);
 701
 702                         case "conversation":
 703                                 if (!$private) {
 704                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 705                                         return false;
 706                                 }
 707                                 return self::receiveConversation($importer, $msg, $fields);
 708
 709                         case "like":
 710                                 return self::receiveLike($importer, $sender, $fields);
 711
 712                         case "message":
 713                                 if (!$private) {
 714                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 715                                         return false;
 716                                 }
 717                                 return self::receiveMessage($importer, $fields);
 718
 719                         case "participation":
 720                                 if (!$private) {
 721                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 722                                         return false;
 723                                 }
 724                                 return self::receiveParticipation($importer, $fields);
 725
 726                         case "photo": // Not implemented
 727                                 return self::receivePhoto($importer, $fields);
 728
 729                         case "poll_participation": // Not implemented
 730                                 return self::receivePollParticipation($importer, $fields);
 731
 732                         case "profile":
 733                                 if (!$private) {
 734                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 735                                         return false;
 736                                 }
 737                                 return self::receiveProfile($importer, $fields);
 738
 739                         case "reshare":
 740                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 741
 742                         case "retraction":
 743                                 return self::receiveRetraction($importer, $sender, $fields);
 744
 745                         case "status_message":
 746                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 747
 748                         default:
 749                                 Logger::log("Unknown message type ".$type);
 750                                 return false;
 751                 }
 752         }
 753
 754         /**
 755          * @brief Checks if a posting is valid and fetches the data fields.
 756          *
 757          * This function does not only check the signature.
 758          * It also does the conversion between the old and the new diaspora format.
 759          *
 760          * @param array $msg Array with the XML, the sender handle and the sender signature
 761          *
 762          * @return bool|SimpleXMLElement If the posting is valid then an array with an SimpleXML object is returned
 763          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 764          * @throws \ImagickException
 765          */
 766         private static function validPosting($msg)
 767         {
 768                 $data = XML::parseString($msg["message"]);
 769
 770                 if (!is_object($data)) {
 771                         Logger::log("No valid XML ".$msg["message"], Logger::DEBUG);
 772                         return false;
 773                 }
 774
 775                 // Is this the new or the old version?
 776                 if ($data->getName() == "XML") {
 777                         $oldXML = true;
 778                         foreach ($data->post->children() as $child) {
 779                                 $element = $child;
 780                         }
 781                 } else {
 782                         $oldXML = false;
 783                         $element = $data;
 784                 }
 785
 786                 $type = $element->getName();
 787                 $orig_type = $type;
 788
 789                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 790
 791                 // All retractions are handled identically from now on.
 792                 // In the new version there will only be "retraction".
 793                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 794                         $type = "retraction";
 795
 796                 if ($type == "request") {
 797                         $type = "contact";
 798                 }
 799
 800                 $fields = new SimpleXMLElement("<".$type."/>");
 801
 802                 $signed_data = "";
 803                 $author_signature = null;
 804                 $parent_author_signature = null;
 805
 806                 foreach ($element->children() as $fieldname => $entry) {
 807                         if ($oldXML) {
 808                                 // Translation for the old XML structure
 809                                 if ($fieldname == "diaspora_handle") {
 810                                         $fieldname = "author";
 811                                 }
 812                                 if ($fieldname == "participant_handles") {
 813                                         $fieldname = "participants";
 814                                 }
 815                                 if (in_array($type, ["like", "participation"])) {
 816                                         if ($fieldname == "target_type") {
 817                                                 $fieldname = "parent_type";
 818                                         }
 819                                 }
 820                                 if ($fieldname == "sender_handle") {
 821                                         $fieldname = "author";
 822                                 }
 823                                 if ($fieldname == "recipient_handle") {
 824                                         $fieldname = "recipient";
 825                                 }
 826                                 if ($fieldname == "root_diaspora_id") {
 827                                         $fieldname = "root_author";
 828                                 }
 829                                 if ($type == "status_message") {
 830                                         if ($fieldname == "raw_message") {
 831                                                 $fieldname = "text";
 832                                         }
 833                                 }
 834                                 if ($type == "retraction") {
 835                                         if ($fieldname == "post_guid") {
 836                                                 $fieldname = "target_guid";
 837                                         }
 838                                         if ($fieldname == "type") {
 839                                                 $fieldname = "target_type";
 840                                         }
 841                                 }
 842                         }
 843
 844                         if (($fieldname == "author_signature") && ($entry != "")) {
 845                                 $author_signature = base64_decode($entry);
 846                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 847                                 $parent_author_signature = base64_decode($entry);
 848                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 849                                 if ($signed_data != "") {
 850                                         $signed_data .= ";";
 851                                 }
 852
 853                                 $signed_data .= $entry;
 854                         }
 855                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 856                                 || ($orig_type == "relayable_retraction")
 857                         ) {
 858                                 XML::copy($entry, $fields, $fieldname);
 859                         }
 860                 }
 861
 862                 // This is something that shouldn't happen at all.
 863                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 864                         if ($msg["author"] != $fields->author) {
 865                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 866                                 return false;
 867                         }
 868                 }
 869
 870                 // Only some message types have signatures. So we quit here for the other types.
 871                 if (!in_array($type, ["comment", "like"])) {
 872                         return $fields;
 873                 }
 874                 // No author_signature? This is a must, so we quit.
 875                 if (!isset($author_signature)) {
 876                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 877                         return false;
 878                 }
 879
 880                 if (isset($parent_author_signature)) {
 881                         $key = self::key($msg["author"]);
 882                         if (empty($key)) {
 883                                 Logger::log("No key found for parent author ".$msg["author"], Logger::DEBUG);
 884                                 return false;
 885                         }
 886
 887                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 888                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 889                                 return false;
 890                         }
 891                 }
 892
 893                 $key = self::key($fields->author);
 894                 if (empty($key)) {
 895                         Logger::log("No key found for author ".$fields->author, Logger::DEBUG);
 896                         return false;
 897                 }
 898
 899                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 900                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 901                         return false;
 902                 } else {
 903                         return $fields;
 904                 }
 905         }
 906
 907         /**
 908          * @brief Fetches the public key for a given handle
 909          *
 910          * @param string $handle The handle
 911          *
 912          * @return string The public key
 913          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 914          * @throws \ImagickException
 915          */
 916         private static function key($handle)
 917         {
 918                 $handle = strval($handle);
 919
 920                 Logger::log("Fetching diaspora key for: ".$handle);
 921
 922                 $r = self::personByHandle($handle);
 923                 if ($r) {
 924                         return $r["pubkey"];
 925                 }
 926
 927                 return "";
 928         }
 929
 930         /**
 931          * @brief Fetches data for a given handle
 932          *
 933          * @param string $handle The handle
 934          *
 935          * @return array the queried data
 936          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 937          * @throws \ImagickException
 938          */
 939         public static function personByHandle($handle)
 940         {
 941                 $update = false;
 942
 943                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 944                 if (DBA::isResult($person)) {
 945                         Logger::debug("In cache " . print_r($person, true));
 946
 947                         // update record occasionally so it doesn't get stale
 948                         $d = strtotime($person["updated"]." +00:00");
 949                         if ($d < strtotime("now - 14 days")) {
 950                                 $update = true;
 951                         }
 952
 953                         if ($person["guid"] == "") {
 954                                 $update = true;
 955                         }
 956                 }
 957
 958                 if (!DBA::isResult($person) || $update) {
 959                         Logger::log("create or refresh", Logger::DEBUG);
 960                         $r = Probe::uri($handle, Protocol::DIASPORA);
 961
 962                         // Note that Friendica contacts will return a "Diaspora person"
 963                         // if Diaspora connectivity is enabled on their server
 964                         if ($r && ($r["network"] === Protocol::DIASPORA)) {
 965                                 self::updateFContact($r);
 966
 967                                 // Fetch the updated or added contact
 968                                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 969                                 if (!DBA::isResult($person)) {
 970                                         $person = $r;
 971                                         $person['id'] = 0;
 972                                 }
 973                         }
 974                 }
 975
 976                 return $person;
 977         }
 978
 979         /**
 980          * @brief Updates the fcontact table
 981          *
 982          * @param array $arr The fcontact data
 983          * @throws \Exception
 984          */
 985         private static function updateFContact($arr)
 986         {
 987                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
 988                         'request' => $arr["request"], 'nick' => $arr["nick"],
 989                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
 990                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
 991                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
 992                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
 993                         'updated' => DateTimeFormat::utcNow()];
 994
 995                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
 996
 997                 DBA::update('fcontact', $fields, $condition, true);
 998         }
 999
1000         /**
1001          * @brief get a handle (user@domain.tld) from a given contact id
1002          *
1003          * @param int $contact_id  The id in the contact table
1004          * @param int $pcontact_id The id in the contact table (Used for the public contact)
1005          *
1006          * @return string the handle
1007          * @throws \Exception
1008          */
1009         private static function handleFromContact($contact_id, $pcontact_id = 0)
1010         {
1011                 $handle = false;
1012
1013                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
1014
1015                 if ($pcontact_id != 0) {
1016                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
1017
1018                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
1019                                 return strtolower($contact["addr"]);
1020                         }
1021                 }
1022
1023                 $r = q(
1024                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1025                         intval($contact_id)
1026                 );
1027
1028                 if (DBA::isResult($r)) {
1029                         $contact = $r[0];
1030
1031                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
1032
1033                         if ($contact['addr'] != "") {
1034                                 $handle = $contact['addr'];
1035                         } else {
1036                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1037                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1038                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1039                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1040                                 $handle = $contact['nick'].'@'.$baseurl;
1041                         }
1042                 }
1043
1044                 return strtolower($handle);
1045         }
1046
1047         /**
1048          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1049          * fcontact guid
1050          *
1051          * @param mixed $fcontact_guid Hexadecimal string guid
1052          *
1053          * @return string the contact url or null
1054          * @throws \Exception
1055          */
1056         public static function urlFromContactGuid($fcontact_guid)
1057         {
1058                 Logger::log("fcontact guid is ".$fcontact_guid, Logger::DEBUG);
1059
1060                 $r = q(
1061                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1062                         DBA::escape(Protocol::DIASPORA),
1063                         DBA::escape($fcontact_guid)
1064                 );
1065
1066                 if (DBA::isResult($r)) {
1067                         return $r[0]['url'];
1068                 }
1069
1070                 return null;
1071         }
1072
1073         /**
1074          * @brief Get a contact id for a given handle
1075          *
1076          * @todo  Move to Friendica\Model\Contact
1077          *
1078          * @param int    $uid    The user id
1079          * @param string $handle The handle in the format user@domain.tld
1080          *
1081          * @return array Contact data
1082          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1083          * @throws \ImagickException
1084          */
1085         private static function contactByHandle($uid, $handle)
1086         {
1087                 $cid = Contact::getIdForURL($handle, $uid);
1088                 if (!$cid) {
1089                         $handle_parts = explode("@", $handle);
1090                         $nurl_sql = "%%://" . $handle_parts[1] . "%%/profile/" . $handle_parts[0];
1091                         $cid = Contact::getIdForURL($nurl_sql, $uid);
1092                 }
1093
1094                 if (!$cid) {
1095                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1096                         return false;
1097                 }
1098
1099                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1100                 if (!DBA::isResult($contact)) {
1101                         // This here shouldn't happen at all
1102                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1103                         return false;
1104                 }
1105
1106                 return $contact;
1107         }
1108
1109         /**
1110          * @brief Check if posting is allowed for this contact
1111          *
1112          * @param array $importer   Array of the importer user
1113          * @param array $contact    The contact that is checked
1114          * @param bool  $is_comment Is the check for a comment?
1115          *
1116          * @return bool is the contact allowed to post?
1117          */
1118         private static function postAllow(array $importer, array $contact, $is_comment = false)
1119         {
1120                 /*
1121                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1122                  * That makes us friends.
1123                  * Normally this should have handled by getting a request - but this could get lost
1124                  */
1125                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1126                 // It is not removed by now. Possibly the code is needed?
1127                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(User::PAGE_FLAGS_FREELOVE))) {
1128                 //      DBA::update(
1129                 //              'contact',
1130                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1131                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1132                 //      );
1133                 //
1134                 //      $contact["rel"] = Contact::FRIEND;
1135                 //      Logger::log("defining user ".$contact["nick"]." as friend");
1136                 //}
1137
1138                 // Contact server is blocked
1139                 if (Network::isUrlBlocked($contact['url'])) {
1140                         return false;
1141                         // We don't seem to like that person
1142                 } elseif ($contact["blocked"]) {
1143                         // Maybe blocked, don't accept.
1144                         return false;
1145                         // We are following this person?
1146                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1147                         // Yes, then it is fine.
1148                         return true;
1149                         // Is it a post to a community?
1150                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
1151                         // That's good
1152                         return true;
1153                         // Is the message a global user or a comment?
1154                 } elseif (($importer["uid"] == 0) || $is_comment) {
1155                         // Messages for the global users and comments are always accepted
1156                         return true;
1157                 }
1158
1159                 return false;
1160         }
1161
1162         /**
1163          * @brief Fetches the contact id for a handle and checks if posting is allowed
1164          *
1165          * @param array  $importer   Array of the importer user
1166          * @param string $handle     The checked handle in the format user@domain.tld
1167          * @param bool   $is_comment Is the check for a comment?
1168          *
1169          * @return array The contact data
1170          * @throws \Exception
1171          */
1172         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
1173         {
1174                 $contact = self::contactByHandle($importer["uid"], $handle);
1175                 if (!$contact) {
1176                         Logger::log("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1177                         // If a contact isn't found, we accept it anyway if it is a comment
1178                         if ($is_comment && ($importer["uid"] != 0)) {
1179                                 return self::contactByHandle(0, $handle);
1180                         } elseif ($is_comment) {
1181                                 return $importer;
1182                         } else {
1183                                 return false;
1184                         }
1185                 }
1186
1187                 if (!self::postAllow($importer, $contact, $is_comment)) {
1188                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1189                         return false;
1190                 }
1191                 return $contact;
1192         }
1193
1194         /**
1195          * @brief Does the message already exists on the system?
1196          *
1197          * @param int    $uid  The user id
1198          * @param string $guid The guid of the message
1199          *
1200          * @return int|bool message id if the message already was stored into the system - or false.
1201          * @throws \Exception
1202          */
1203         private static function messageExists($uid, $guid)
1204         {
1205                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1206                 if (DBA::isResult($item)) {
1207                         Logger::log("message ".$guid." already exists for user ".$uid);
1208                         return $item["id"];
1209                 }
1210
1211                 return false;
1212         }
1213
1214         /**
1215          * @brief Checks for links to posts in a message
1216          *
1217          * @param array $item The item array
1218          * @return void
1219          */
1220         private static function fetchGuid(array $item)
1221         {
1222                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1223                 preg_replace_callback(
1224                         $expression,
1225                         function ($match) use ($item) {
1226                                 self::fetchGuidSub($match, $item);
1227                         },
1228                         $item["body"]
1229                 );
1230
1231                 preg_replace_callback(
1232                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1233                         function ($match) use ($item) {
1234                                 self::fetchGuidSub($match, $item);
1235                         },
1236                         $item["body"]
1237                 );
1238         }
1239
1240         /**
1241          * @brief Checks for relative /people/* links in an item body to match local
1242          * contacts or prepends the remote host taken from the author link.
1243          *
1244          * @param string $body        The item body to replace links from
1245          * @param string $author_link The author link for missing local contact fallback
1246          *
1247          * @return string the replaced string
1248          */
1249         public static function replacePeopleGuid($body, $author_link)
1250         {
1251                 $return = preg_replace_callback(
1252                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1253                         function ($match) use ($author_link) {
1254                                 // $match
1255                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1256                                 // 1 => '0123456789abcdef'
1257                                 // 2 => 'Foo Bar'
1258                                 $handle = self::urlFromContactGuid($match[1]);
1259
1260                                 if ($handle) {
1261                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1262                                 } else {
1263                                         // No local match, restoring absolute remote URL from author scheme and host
1264                                         $author_url = parse_url($author_link);
1265                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1266                                 }
1267
1268                                 return $return;
1269                         },
1270                         $body
1271                 );
1272
1273                 return $return;
1274         }
1275
1276         /**
1277          * @brief sub function of "fetchGuid" which checks for links in messages
1278          *
1279          * @param array $match array containing a link that has to be checked for a message link
1280          * @param array $item  The item array
1281          * @return void
1282          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1283          * @throws \ImagickException
1284          */
1285         private static function fetchGuidSub($match, $item)
1286         {
1287                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1288                         self::storeByGuid($match[1], $item["owner-link"]);
1289                 }
1290         }
1291
1292         /**
1293          * @brief Fetches an item with a given guid from a given server
1294          *
1295          * @param string $guid   the message guid
1296          * @param string $server The server address
1297          * @param int    $uid    The user id of the user
1298          *
1299          * @return int the message id of the stored message or false
1300          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1301          * @throws \ImagickException
1302          */
1303         private static function storeByGuid($guid, $server, $uid = 0)
1304         {
1305                 $serverparts = parse_url($server);
1306
1307                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1308                         return false;
1309                 }
1310
1311                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1312
1313                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1314
1315                 $msg = self::message($guid, $server);
1316
1317                 if (!$msg) {
1318                         return false;
1319                 }
1320
1321                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1322
1323                 // Now call the dispatcher
1324                 return self::dispatchPublic($msg);
1325         }
1326
1327         /**
1328          * @brief Fetches a message from a server
1329          *
1330          * @param string $guid   message guid
1331          * @param string $server The url of the server
1332          * @param int    $level  Endless loop prevention
1333          *
1334          * @return array
1335          *      'message' => The message XML
1336          *      'author' => The author handle
1337          *      'key' => The public key of the author
1338          * @throws \Exception
1339          */
1340         private static function message($guid, $server, $level = 0)
1341         {
1342                 if ($level > 5) {
1343                         return false;
1344                 }
1345
1346                 // This will work for new Diaspora servers and Friendica servers from 3.5
1347                 $source_url = $server."/fetch/post/".urlencode($guid);
1348
1349                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1350
1351                 $envelope = Network::fetchUrl($source_url);
1352                 if ($envelope) {
1353                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1354                         $x = self::verifyMagicEnvelope($envelope);
1355                         if (!$x) {
1356                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1357                         } else {
1358                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1359                         }
1360                 } else {
1361                         $x = false;
1362                 }
1363
1364                 if (!$x) {
1365                         return false;
1366                 }
1367
1368                 $source_xml = XML::parseString($x);
1369
1370                 if (!is_object($source_xml)) {
1371                         return false;
1372                 }
1373
1374                 if ($source_xml->post->reshare) {
1375                         // Reshare of a reshare - old Diaspora version
1376                         Logger::log("Message is a reshare", Logger::DEBUG);
1377                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1378                 } elseif ($source_xml->getName() == "reshare") {
1379                         // Reshare of a reshare - new Diaspora version
1380                         Logger::log("Message is a new reshare", Logger::DEBUG);
1381                         return self::message($source_xml->root_guid, $server, ++$level);
1382                 }
1383
1384                 $author = "";
1385
1386                 // Fetch the author - for the old and the new Diaspora version
1387                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1388                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1389                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1390                         $author = (string)$source_xml->author;
1391                 }
1392
1393                 // If this isn't a "status_message" then quit
1394                 if (!$author) {
1395                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1396                         return false;
1397                 }
1398
1399                 $msg = ["message" => $x, "author" => $author];
1400
1401                 $msg["key"] = self::key($msg["author"]);
1402
1403                 return $msg;
1404         }
1405
1406         /**
1407          * @brief Fetches the item record of a given guid
1408          *
1409          * @param int    $uid     The user id
1410          * @param string $guid    message guid
1411          * @param string $author  The handle of the item
1412          * @param array  $contact The contact of the item owner
1413          *
1414          * @return array the item record
1415          * @throws \Exception
1416          */
1417         private static function parentItem($uid, $guid, $author, array $contact)
1418         {
1419                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1420                         'author-name', 'author-link', 'author-avatar',
1421                         'owner-name', 'owner-link', 'owner-avatar'];
1422                 $condition = ['uid' => $uid, 'guid' => $guid];
1423                 $item = Item::selectFirst($fields, $condition);
1424
1425                 if (!DBA::isResult($item)) {
1426                         $person = self::personByHandle($author);
1427                         $result = self::storeByGuid($guid, $person["url"], $uid);
1428
1429                         // We don't have an url for items that arrived at the public dispatcher
1430                         if (!$result && !empty($contact["url"])) {
1431                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1432                         }
1433
1434                         if ($result) {
1435                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1436
1437                                 $item = Item::selectFirst($fields, $condition);
1438                         }
1439                 }
1440
1441                 if (!DBA::isResult($item)) {
1442                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1443                         return false;
1444                 } else {
1445                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1446                         return $item;
1447                 }
1448         }
1449
1450         /**
1451          * @brief returns contact details
1452          *
1453          * @param array $def_contact The default contact if the person isn't found
1454          * @param array $person      The record of the person
1455          * @param int   $uid         The user id
1456          *
1457          * @return array
1458          *      'cid' => contact id
1459          *      'network' => network type
1460          * @throws \Exception
1461          */
1462         private static function authorContactByUrl($def_contact, $person, $uid)
1463         {
1464                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1465                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1466                 if (DBA::isResult($contact)) {
1467                         $cid = $contact["id"];
1468                         $network = $contact["network"];
1469                 } else {
1470                         $cid = $def_contact["id"];
1471                         $network = Protocol::DIASPORA;
1472                 }
1473
1474                 return ["cid" => $cid, "network" => $network];
1475         }
1476
1477         /**
1478          * @brief Is the profile a hubzilla profile?
1479          *
1480          * @param string $url The profile link
1481          *
1482          * @return bool is it a hubzilla server?
1483          */
1484         public static function isRedmatrix($url)
1485         {
1486                 return(strstr($url, "/channel/"));
1487         }
1488
1489         /**
1490          * @brief Generate a post link with a given handle and message guid
1491          *
1492          * @param string $addr        The user handle
1493          * @param string $guid        message guid
1494          * @param string $parent_guid optional parent guid
1495          *
1496          * @return string the post link
1497          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1498          * @throws \ImagickException
1499          */
1500         private static function plink($addr, $guid, $parent_guid = '')
1501         {
1502                 $contact = Contact::getDetailsByAddr($addr);
1503
1504                 // Fallback
1505                 if (!$contact) {
1506                         if ($parent_guid != '') {
1507                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1508                         } else {
1509                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1510                         }
1511                 }
1512
1513                 if ($contact["network"] == Protocol::DFRN) {
1514                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1515                 }
1516
1517                 if (self::isRedmatrix($contact["url"])) {
1518                         return $contact["url"] . "/?f=&mid=" . $guid;
1519                 }
1520
1521                 if ($parent_guid != '') {
1522                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1523                 } else {
1524                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1525                 }
1526         }
1527
1528         /**
1529          * @brief Receives account migration
1530          *
1531          * @param array  $importer Array of the importer user
1532          * @param object $data     The message object
1533          *
1534          * @return bool Success
1535          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1536          * @throws \ImagickException
1537          */
1538         private static function receiveAccountMigration(array $importer, $data)
1539         {
1540                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1541                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1542                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1543
1544                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1545                 if (!$contact) {
1546                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1547                         return false;
1548                 }
1549
1550                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1551
1552                 // Check signature
1553                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1554                 $key = self::key($old_handle);
1555                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1556                         Logger::log('No valid signature for migration.');
1557                         return false;
1558                 }
1559
1560                 // Update the profile
1561                 self::receiveProfile($importer, $data->profile);
1562
1563                 // change the technical stuff in contact and gcontact
1564                 $data = Probe::uri($new_handle);
1565                 if ($data['network'] == Protocol::PHANTOM) {
1566                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1567                         return false;
1568                 }
1569
1570                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1571                                 'name' => $data['name'], 'nick' => $data['nick'],
1572                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1573                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1574                                 'network' => $data['network']];
1575
1576                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1577
1578                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1579                                 'name' => $data['name'], 'nick' => $data['nick'],
1580                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1581                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1582                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1583
1584                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1585
1586                 Logger::log('Contacts are updated.');
1587
1588                 return true;
1589         }
1590
1591         /**
1592          * @brief Processes an account deletion
1593          *
1594          * @param object $data The message object
1595          *
1596          * @return bool Success
1597          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1598          */
1599         private static function receiveAccountDeletion($data)
1600         {
1601                 $author = Strings::escapeTags(XML::unescape($data->author));
1602
1603                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1604                 while ($contact = DBA::fetch($contacts)) {
1605                         Contact::remove($contact["id"]);
1606                 }
1607
1608                 DBA::delete('gcontact', ['addr' => $author]);
1609
1610                 Logger::log('Removed contacts for ' . $author);
1611
1612                 return true;
1613         }
1614
1615         /**
1616          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1617          *
1618          * @param string  $author    Author handle
1619          * @param string  $guid      Message guid
1620          * @param boolean $onlyfound Only return uri when found in the database
1621          *
1622          * @return string The constructed uri or the one from our database
1623          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1624          * @throws \ImagickException
1625          */
1626         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1627         {
1628                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1629                 if (DBA::isResult($item)) {
1630                         return $item["uri"];
1631                 } elseif (!$onlyfound) {
1632                         $person = self::personByHandle($author);
1633
1634                         $parts = parse_url($person['url']);
1635                         unset($parts['path']);
1636                         $host_url = Network::unparseURL($parts);
1637
1638                         return $host_url . '/objects/' . $guid;
1639                 }
1640
1641                 return "";
1642         }
1643
1644         /**
1645          * @brief Fetch the guid from our database with a given uri
1646          *
1647          * @param string $uri Message uri
1648          * @param string $uid Author handle
1649          *
1650          * @return string The post guid
1651          * @throws \Exception
1652          */
1653         private static function getGuidFromUri($uri, $uid)
1654         {
1655                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1656                 if (DBA::isResult($item)) {
1657                         return $item["guid"];
1658                 } else {
1659                         return false;
1660                 }
1661         }
1662
1663         /**
1664          * @brief Find the best importer for a comment, like, ...
1665          *
1666          * @param string $guid The guid of the item
1667          *
1668          * @return array|boolean the origin owner of that post - or false
1669          * @throws \Exception
1670          */
1671         private static function importerForGuid($guid)
1672         {
1673                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1674                 if (DBA::isResult($item)) {
1675                         Logger::log("Found user ".$item['uid']." as owner of item ".$guid, Logger::DEBUG);
1676                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1677                         if (DBA::isResult($contact)) {
1678                                 return $contact;
1679                         }
1680                 }
1681                 return false;
1682         }
1683
1684         /**
1685          * @brief Processes an incoming comment
1686          *
1687          * @param array  $importer Array of the importer user
1688          * @param string $sender   The sender of the message
1689          * @param object $data     The message object
1690          * @param string $xml      The original XML of the message
1691          *
1692          * @return int The message id of the generated comment or "false" if there was an error
1693          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1694          * @throws \ImagickException
1695          */
1696         private static function receiveComment(array $importer, $sender, $data, $xml)
1697         {
1698                 $author = Strings::escapeTags(XML::unescape($data->author));
1699                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1700                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1701                 $text = XML::unescape($data->text);
1702
1703                 if (isset($data->created_at)) {
1704                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1705                 } else {
1706                         $created_at = DateTimeFormat::utcNow();
1707                 }
1708
1709                 if (isset($data->thread_parent_guid)) {
1710                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1711                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1712                 } else {
1713                         $thr_uri = "";
1714                 }
1715
1716                 $contact = self::allowedContactByHandle($importer, $sender, true);
1717                 if (!$contact) {
1718                         return false;
1719                 }
1720
1721                 $message_id = self::messageExists($importer["uid"], $guid);
1722                 if ($message_id) {
1723                         return true;
1724                 }
1725
1726                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1727                 if (!$parent_item) {
1728                         return false;
1729                 }
1730
1731                 $person = self::personByHandle($author);
1732                 if (!is_array($person)) {
1733                         Logger::log("unable to find author details");
1734                         return false;
1735                 }
1736
1737                 // Fetch the contact id - if we know this contact
1738                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1739
1740                 $datarray = [];
1741
1742                 $datarray["uid"] = $importer["uid"];
1743                 $datarray["contact-id"] = $author_contact["cid"];
1744                 $datarray["network"]  = $author_contact["network"];
1745
1746                 $datarray["author-link"] = $person["url"];
1747                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1748
1749                 $datarray["owner-link"] = $contact["url"];
1750                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1751
1752                 $datarray["guid"] = $guid;
1753                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1754
1755                 $datarray["verb"] = ACTIVITY_POST;
1756                 $datarray["gravity"] = GRAVITY_COMMENT;
1757
1758                 if ($thr_uri != "") {
1759                         $datarray["parent-uri"] = $thr_uri;
1760                 } else {
1761                         $datarray["parent-uri"] = $parent_item["uri"];
1762                 }
1763
1764                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1765
1766                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1767                 $datarray["source"] = $xml;
1768
1769                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1770
1771                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1772
1773                 $body = Markdown::toBBCode($text);
1774
1775                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1776
1777                 self::fetchGuid($datarray);
1778
1779                 // If we are the origin of the parent we store the original data.
1780                 // We notify our followers during the item storage.
1781                 if ($parent_item["origin"]) {
1782                         $datarray['diaspora_signed_text'] = json_encode($data);
1783                 }
1784
1785                 $message_id = Item::insert($datarray);
1786
1787                 if ($message_id <= 0) {
1788                         return false;
1789                 }
1790
1791                 if ($message_id) {
1792                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1793                         if ($datarray['uid'] == 0) {
1794                                 Item::distribute($message_id, json_encode($data));
1795                         }
1796                 }
1797
1798                 return true;
1799         }
1800
1801         /**
1802          * @brief processes and stores private messages
1803          *
1804          * @param array  $importer     Array of the importer user
1805          * @param array  $contact      The contact of the message
1806          * @param object $data         The message object
1807          * @param array  $msg          Array of the processed message, author handle and key
1808          * @param object $mesg         The private message
1809          * @param array  $conversation The conversation record to which this message belongs
1810          *
1811          * @return bool "true" if it was successful
1812          * @throws \Exception
1813          */
1814         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1815         {
1816                 $author = Strings::escapeTags(XML::unescape($data->author));
1817                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1818                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1819
1820                 // "diaspora_handle" is the element name from the old version
1821                 // "author" is the element name from the new version
1822                 if ($mesg->author) {
1823                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1824                 } elseif ($mesg->diaspora_handle) {
1825                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1826                 } else {
1827                         return false;
1828                 }
1829
1830                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1831                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1832                 $msg_text = XML::unescape($mesg->text);
1833                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1834
1835                 if ($msg_conversation_guid != $guid) {
1836                         Logger::log("message conversation guid does not belong to the current conversation.");
1837                         return false;
1838                 }
1839
1840                 $body = Markdown::toBBCode($msg_text);
1841                 $message_uri = $msg_author.":".$msg_guid;
1842
1843                 $person = self::personByHandle($msg_author);
1844
1845                 DBA::lock('mail');
1846
1847                 if (DBA::exists('mail', ['guid' => $msg_guid, 'uid' => $importer["uid"]])) {
1848                         Logger::log("duplicate message already delivered.", Logger::DEBUG);
1849                         return false;
1850                 }
1851
1852                 DBA::insert('mail', [
1853                         'uid'        => $importer['uid'],
1854                         'guid'       => $msg_guid,
1855                         'convid'     => $conversation['id'],
1856                         'from-name'  => $person['name'],
1857                         'from-photo' => $person['photo'],
1858                         'from-url'   => $person['url'],
1859                         'contact-id' => $contact['id'],
1860                         'title'      => $subject,
1861                         'body'       => $body,
1862                         'seen'       => 0,
1863                         'reply'      => 0,
1864                         'uri'        => $message_uri,
1865                         'parent-uri' => $author . ':' . $guid,
1866                         'created'    => $msg_created_at
1867                 ]);
1868
1869                 $message_id = DBA::lastInsertId();
1870
1871                 DBA::unlock();
1872
1873                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
1874
1875                 notification([
1876                         "type" => NOTIFY_MAIL,
1877                         "notify_flags" => $importer["notify-flags"],
1878                         "language" => $importer["language"],
1879                         "to_name" => $importer["username"],
1880                         "to_email" => $importer["email"],
1881                         "uid" => $importer["uid"],
1882                         "item" => ["id" => $message_id, "title" => $subject, "subject" => $subject, "body" => $body],
1883                         "parent" => $conversation["id"],
1884                         "source_name" => $person["name"],
1885                         "source_link" => $person["url"],
1886                         "source_photo" => $person["photo"],
1887                         "verb" => ACTIVITY_POST,
1888                         "otype" => "mail"
1889                 ]);
1890
1891                 return true;
1892         }
1893
1894         /**
1895          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1896          *
1897          * @param array  $importer Array of the importer user
1898          * @param array  $msg      Array of the processed message, author handle and key
1899          * @param object $data     The message object
1900          *
1901          * @return bool Success
1902          * @throws \Exception
1903          */
1904         private static function receiveConversation(array $importer, $msg, $data)
1905         {
1906                 $author = Strings::escapeTags(XML::unescape($data->author));
1907                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1908                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1909                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1910                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1911
1912                 $messages = $data->message;
1913
1914                 if (!count($messages)) {
1915                         Logger::log("empty conversation");
1916                         return false;
1917                 }
1918
1919                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1920                 if (!$contact) {
1921                         return false;
1922                 }
1923
1924                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1925                 if (!DBA::isResult($conversation)) {
1926                         $r = q(
1927                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1928                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1929                                 intval($importer["uid"]),
1930                                 DBA::escape($guid),
1931                                 DBA::escape($author),
1932                                 DBA::escape($created_at),
1933                                 DBA::escape(DateTimeFormat::utcNow()),
1934                                 DBA::escape($subject),
1935                                 DBA::escape($participants)
1936                         );
1937                         if ($r) {
1938                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1939                         }
1940                 }
1941                 if (!$conversation) {
1942                         Logger::log("unable to create conversation.");
1943                         return false;
1944                 }
1945
1946                 foreach ($messages as $mesg) {
1947                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1948                 }
1949
1950                 return true;
1951         }
1952
1953         /**
1954          * @brief Processes "like" messages
1955          *
1956          * @param array  $importer Array of the importer user
1957          * @param string $sender   The sender of the message
1958          * @param object $data     The message object
1959          *
1960          * @return int The message id of the generated like or "false" if there was an error
1961          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1962          * @throws \ImagickException
1963          */
1964         private static function receiveLike(array $importer, $sender, $data)
1965         {
1966                 $author = Strings::escapeTags(XML::unescape($data->author));
1967                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1968                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1969                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
1970                 $positive = Strings::escapeTags(XML::unescape($data->positive));
1971
1972                 // likes on comments aren't supported by Diaspora - only on posts
1973                 // But maybe this will be supported in the future, so we will accept it.
1974                 if (!in_array($parent_type, ["Post", "Comment"])) {
1975                         return false;
1976                 }
1977
1978                 $contact = self::allowedContactByHandle($importer, $sender, true);
1979                 if (!$contact) {
1980                         return false;
1981                 }
1982
1983                 $message_id = self::messageExists($importer["uid"], $guid);
1984                 if ($message_id) {
1985                         return true;
1986                 }
1987
1988                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1989                 if (!$parent_item) {
1990                         return false;
1991                 }
1992
1993                 $person = self::personByHandle($author);
1994                 if (!is_array($person)) {
1995                         Logger::log("unable to find author details");
1996                         return false;
1997                 }
1998
1999                 // Fetch the contact id - if we know this contact
2000                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2001
2002                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2003                 // We would accept this anyhow.
2004                 if ($positive == "true") {
2005                         $verb = ACTIVITY_LIKE;
2006                 } else {
2007                         $verb = ACTIVITY_DISLIKE;
2008                 }
2009
2010                 $datarray = [];
2011
2012                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2013
2014                 $datarray["uid"] = $importer["uid"];
2015                 $datarray["contact-id"] = $author_contact["cid"];
2016                 $datarray["network"]  = $author_contact["network"];
2017
2018                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
2019                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
2020
2021                 $datarray["guid"] = $guid;
2022                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2023
2024                 $datarray["verb"] = $verb;
2025                 $datarray["gravity"] = GRAVITY_ACTIVITY;
2026                 $datarray["parent-uri"] = $parent_item["uri"];
2027
2028                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2029
2030                 $datarray["body"] = $verb;
2031
2032                 // Diaspora doesn't provide a date for likes
2033                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
2034
2035                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2036                 if ($parent_item["id"] != $parent_item["parent"]) {
2037                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item["parent"]]);
2038                         $origin = $toplevel["origin"];
2039                 } else {
2040                         $origin = $parent_item["origin"];
2041                 }
2042
2043                 // If we are the origin of the parent we store the original data.
2044                 // We notify our followers during the item storage.
2045                 if ($origin) {
2046                         $datarray['diaspora_signed_text'] = json_encode($data);
2047                 }
2048
2049                 $message_id = Item::insert($datarray);
2050
2051                 if ($message_id <= 0) {
2052                         return false;
2053                 }
2054
2055                 if ($message_id) {
2056                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2057                         if ($datarray['uid'] == 0) {
2058                                 Item::distribute($message_id, json_encode($data));
2059                         }
2060                 }
2061
2062                 return true;
2063         }
2064
2065         /**
2066          * @brief Processes private messages
2067          *
2068          * @param array  $importer Array of the importer user
2069          * @param object $data     The message object
2070          *
2071          * @return bool Success?
2072          * @throws \Exception
2073          */
2074         private static function receiveMessage(array $importer, $data)
2075         {
2076                 $author = Strings::escapeTags(XML::unescape($data->author));
2077                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2078                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
2079                 $text = XML::unescape($data->text);
2080                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2081
2082                 $contact = self::allowedContactByHandle($importer, $author, true);
2083                 if (!$contact) {
2084                         return false;
2085                 }
2086
2087                 $conversation = null;
2088
2089                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
2090                 $conversation = DBA::selectFirst('conv', [], $condition);
2091
2092                 if (!DBA::isResult($conversation)) {
2093                         Logger::log("conversation not available.");
2094                         return false;
2095                 }
2096
2097                 $message_uri = $author.":".$guid;
2098
2099                 $person = self::personByHandle($author);
2100                 if (!$person) {
2101                         Logger::log("unable to find author details");
2102                         return false;
2103                 }
2104
2105                 $body = Markdown::toBBCode($text);
2106
2107                 $body = self::replacePeopleGuid($body, $person["url"]);
2108
2109                 DBA::lock('mail');
2110
2111                 if (DBA::exists('mail', ['guid' => $guid, 'uid' => $importer["uid"]])) {
2112                         Logger::log("duplicate message already delivered.", Logger::DEBUG);
2113                         return false;
2114                 }
2115
2116                 DBA::insert('mail', [
2117                         'uid'        => $importer['uid'],
2118                         'guid'       => $guid,
2119                         'convid'     => $conversation['id'],
2120                         'from-name'  => $person['name'],
2121                         'from-photo' => $person['photo'],
2122                         'from-url'   => $person['url'],
2123                         'contact-id' => $contact['id'],
2124                         'title'      => $conversation['subject'],
2125                         'body'       => $body,
2126                         'seen'       => 0,
2127                         'reply'      => 1,
2128                         'uri'        => $message_uri,
2129                         'parent-uri' => $author.":".$conversation['guid'],
2130                         'created'    => $created_at
2131                 ]);
2132
2133                 $message_id = DBA::lastInsertId();
2134
2135                 DBA::unlock();
2136
2137                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
2138
2139                 notification([
2140                         "type" => NOTIFY_MAIL,
2141                         "notify_flags" => $importer["notify-flags"],
2142                         "language" => $importer["language"],
2143                         "to_name" => $importer["username"],
2144                         "to_email" => $importer["email"],
2145                         "uid" => $importer["uid"],
2146                         "item" => ["id" => $message_id, "title" => $conversation["subject"], "subject" => $conversation["subject"], "body" => $body],
2147                         "parent" => $conversation["id"],
2148                         "source_name" => $person["name"],
2149                         "source_link" => $person["url"],
2150                         "source_photo" => $person["photo"],
2151                         "verb" => ACTIVITY_POST,
2152                         "otype" => "mail"
2153                 ]);
2154
2155                 return true;
2156         }
2157
2158         /**
2159          * @brief Processes participations - unsupported by now
2160          *
2161          * @param array  $importer Array of the importer user
2162          * @param object $data     The message object
2163          *
2164          * @return bool always true
2165          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2166          * @throws \ImagickException
2167          */
2168         private static function receiveParticipation(array $importer, $data)
2169         {
2170                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2171                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2172
2173                 $contact_id = Contact::getIdForURL($author);
2174                 if (!$contact_id) {
2175                         Logger::log('Contact not found: '.$author);
2176                         return false;
2177                 }
2178
2179                 $person = self::personByHandle($author);
2180                 if (!is_array($person)) {
2181                         Logger::log("Person not found: ".$author);
2182                         return false;
2183                 }
2184
2185                 $item = Item::selectFirst(['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2186                 if (!DBA::isResult($item)) {
2187                         Logger::log('Item not found, no origin or private: '.$parent_guid);
2188                         return false;
2189                 }
2190
2191                 $author_parts = explode('@', $author);
2192                 if (isset($author_parts[1])) {
2193                         $server = $author_parts[1];
2194                 } else {
2195                         // Should never happen
2196                         $server = $author;
2197                 }
2198
2199                 Logger::log('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, Logger::DEBUG);
2200
2201                 if (!DBA::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2202                         DBA::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2203                 }
2204
2205                 // Send all existing comments and likes to the requesting server
2206                 $comments = Item::select(['id', 'parent', 'verb', 'self'], ['parent' => $item['id']]);
2207                 while ($comment = Item::fetch($comments)) {
2208                         if ($comment['id'] == $comment['parent']) {
2209                                 continue;
2210                         }
2211                         if ($comment['verb'] == ACTIVITY_POST) {
2212                                 $cmd = $comment['self'] ? 'comment-new' : 'comment-import';
2213                         } else {
2214                                 $cmd = $comment['self'] ? 'like' : 'comment-import';
2215                         }
2216                         Logger::log("Send ".$cmd." for item ".$comment['id']." to contact ".$contact_id, Logger::DEBUG);
2217                         Worker::add(PRIORITY_HIGH, 'Delivery', $cmd, $comment['id'], $contact_id);
2218                 }
2219                 DBA::close($comments);
2220
2221                 return true;
2222         }
2223
2224         /**
2225          * @brief Processes photos - unneeded
2226          *
2227          * @param array  $importer Array of the importer user
2228          * @param object $data     The message object
2229          *
2230          * @return bool always true
2231          */
2232         private static function receivePhoto(array $importer, $data)
2233         {
2234                 // There doesn't seem to be a reason for this function,
2235                 // since the photo data is transmitted in the status message as well
2236                 return true;
2237         }
2238
2239         /**
2240          * @brief Processes poll participations - unssupported
2241          *
2242          * @param array  $importer Array of the importer user
2243          * @param object $data     The message object
2244          *
2245          * @return bool always true
2246          */
2247         private static function receivePollParticipation(array $importer, $data)
2248         {
2249                 // We don't support polls by now
2250                 return true;
2251         }
2252
2253         /**
2254          * @brief Processes incoming profile updates
2255          *
2256          * @param array  $importer Array of the importer user
2257          * @param object $data     The message object
2258          *
2259          * @return bool Success
2260          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2261          * @throws \ImagickException
2262          */
2263         private static function receiveProfile(array $importer, $data)
2264         {
2265                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2266
2267                 $contact = self::contactByHandle($importer["uid"], $author);
2268                 if (!$contact) {
2269                         return false;
2270                 }
2271
2272                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2273                 $image_url = XML::unescape($data->image_url);
2274                 $birthday = XML::unescape($data->birthday);
2275                 $gender = XML::unescape($data->gender);
2276                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2277                 $location = Markdown::toBBCode(XML::unescape($data->location));
2278                 $searchable = (XML::unescape($data->searchable) == "true");
2279                 $nsfw = (XML::unescape($data->nsfw) == "true");
2280                 $tags = XML::unescape($data->tag_string);
2281
2282                 $tags = explode("#", $tags);
2283
2284                 $keywords = [];
2285                 foreach ($tags as $tag) {
2286                         $tag = trim(strtolower($tag));
2287                         if ($tag != "") {
2288                                 $keywords[] = $tag;
2289                         }
2290                 }
2291
2292                 $keywords = implode(", ", $keywords);
2293
2294                 $handle_parts = explode("@", $author);
2295                 $nick = $handle_parts[0];
2296
2297                 if ($name === "") {
2298                         $name = $handle_parts[0];
2299                 }
2300
2301                 if (preg_match("|^https?://|", $image_url) === 0) {
2302                         $image_url = "http://".$handle_parts[1].$image_url;
2303                 }
2304
2305                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2306
2307                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2308
2309                 $birthday = str_replace("1000", "1901", $birthday);
2310
2311                 if ($birthday != "") {
2312                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2313                 }
2314
2315                 // this is to prevent multiple birthday notifications in a single year
2316                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2317
2318                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2319                         $birthday = $contact["bd"];
2320                 }
2321
2322                 $fields = ['name' => $name, 'location' => $location,
2323                         'name-date' => DateTimeFormat::utcNow(),
2324                         'about' => $about, 'gender' => $gender,
2325                         'addr' => $author, 'nick' => $nick,
2326                         'keywords' => $keywords];
2327
2328                 if (!empty($birthday)) {
2329                         $fields['bd'] = $birthday;
2330                 }
2331
2332                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2333
2334                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2335                                         "photo" => $image_url, "name" => $name, "location" => $location,
2336                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2337                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2338                                         "hide" => !$searchable, "nsfw" => $nsfw];
2339
2340                 $gcid = GContact::update($gcontact);
2341
2342                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2343
2344                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2345
2346                 return true;
2347         }
2348
2349         /**
2350          * @brief Processes incoming friend requests
2351          *
2352          * @param array $importer Array of the importer user
2353          * @param array $contact  The contact that send the request
2354          * @return void
2355          * @throws \Exception
2356          */
2357         private static function receiveRequestMakeFriend(array $importer, array $contact)
2358         {
2359                 if ($contact["rel"] == Contact::SHARING) {
2360                         DBA::update(
2361                                 'contact',
2362                                 ['rel' => Contact::FRIEND, 'writable' => true],
2363                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2364                         );
2365                 }
2366         }
2367
2368         /**
2369          * @brief Processes incoming sharing notification
2370          *
2371          * @param array  $importer Array of the importer user
2372          * @param object $data     The message object
2373          *
2374          * @return bool Success
2375          * @throws \Exception
2376          */
2377         private static function receiveContactRequest(array $importer, $data)
2378         {
2379                 $author = XML::unescape($data->author);
2380                 $recipient = XML::unescape($data->recipient);
2381
2382                 if (!$author || !$recipient) {
2383                         return false;
2384                 }
2385
2386                 // the current protocol version doesn't know these fields
2387                 // That means that we will assume their existance
2388                 if (isset($data->following)) {
2389                         $following = (XML::unescape($data->following) == "true");
2390                 } else {
2391                         $following = true;
2392                 }
2393
2394                 if (isset($data->sharing)) {
2395                         $sharing = (XML::unescape($data->sharing) == "true");
2396                 } else {
2397                         $sharing = true;
2398                 }
2399
2400                 $contact = self::contactByHandle($importer["uid"], $author);
2401
2402                 // perhaps we were already sharing with this person. Now they're sharing with us.
2403                 // That makes us friends.
2404                 if ($contact) {
2405                         if ($following) {
2406                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2407                                 self::receiveRequestMakeFriend($importer, $contact);
2408
2409                                 // refetch the contact array
2410                                 $contact = self::contactByHandle($importer["uid"], $author);
2411
2412                                 // If we are now friends, we are sending a share message.
2413                                 // Normally we needn't to do so, but the first message could have been vanished.
2414                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2415                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2416                                         if (DBA::isResult($user)) {
2417                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2418                                                 self::sendShare($user, $contact);
2419                                         }
2420                                 }
2421                                 return true;
2422                         } else {
2423                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2424                                 Contact::removeFollower($importer, $contact);
2425                                 return true;
2426                         }
2427                 }
2428
2429                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2430                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2431                         return false;
2432                 } elseif (!$following && !$sharing) {
2433                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2434                         return false;
2435                 } elseif (!$following && $sharing) {
2436                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2437                 } elseif ($following && $sharing) {
2438                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2439                 } elseif ($following && !$sharing) {
2440                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2441                 }
2442
2443                 $ret = self::personByHandle($author);
2444
2445                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2446                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2447                         return false;
2448                 }
2449
2450                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2451
2452                 q(
2453                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2454                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2455                         intval($importer["uid"]),
2456                         DBA::escape($ret["network"]),
2457                         DBA::escape($ret["addr"]),
2458                         DateTimeFormat::utcNow(),
2459                         DBA::escape($ret["url"]),
2460                         DBA::escape(Strings::normaliseLink($ret["url"])),
2461                         DBA::escape($batch),
2462                         DBA::escape($ret["name"]),
2463                         DBA::escape($ret["nick"]),
2464                         DBA::escape($ret["photo"]),
2465                         DBA::escape($ret["pubkey"]),
2466                         DBA::escape($ret["notify"]),
2467                         DBA::escape($ret["poll"]),
2468                         1,
2469                         2
2470                 );
2471
2472                 // find the contact record we just created
2473
2474                 $contact_record = self::contactByHandle($importer["uid"], $author);
2475
2476                 if (!$contact_record) {
2477                         Logger::log("unable to locate newly created contact record.");
2478                         return;
2479                 }
2480
2481                 Logger::log("Author ".$author." was added as contact number ".$contact_record["id"].".", Logger::DEBUG);
2482
2483                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2484
2485                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2486
2487                 if (in_array($importer["page-flags"], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP])) {
2488                         Logger::log("Sending intra message for author ".$author.".", Logger::DEBUG);
2489
2490                         $hash = Strings::getRandomHex().(string)time();   // Generate a confirm_key
2491
2492                         q(
2493                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2494                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2495                                 intval($importer["uid"]),
2496                                 intval($contact_record["id"]),
2497                                 0,
2498                                 0,
2499                                 DBA::escape(L10n::t("Sharing notification from Diaspora network")),
2500                                 DBA::escape($hash),
2501                                 DBA::escape(DateTimeFormat::utcNow())
2502                         );
2503                 } else {
2504                         // automatic friend approval
2505
2506                         Logger::log("Does an automatic friend approval for author ".$author.".", Logger::DEBUG);
2507
2508                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2509
2510                         /*
2511                          * technically they are sharing with us (Contact::SHARING),
2512                          * but if our page-type is Profile::PAGE_COMMUNITY or Profile::PAGE_SOAPBOX
2513                          * we are going to change the relationship and make them a follower.
2514                          */
2515                         if (($importer["page-flags"] == User::PAGE_FLAGS_FREELOVE) && $sharing && $following) {
2516                                 $new_relation = Contact::FRIEND;
2517                         } elseif (($importer["page-flags"] == User::PAGE_FLAGS_FREELOVE) && $sharing) {
2518                                 $new_relation = Contact::SHARING;
2519                         } else {
2520                                 $new_relation = Contact::FOLLOWER;
2521                         }
2522
2523                         q(
2524                                 "UPDATE `contact` SET `rel` = %d,
2525                                 `name-date` = '%s',
2526                                 `uri-date` = '%s',
2527                                 `blocked` = 0,
2528                                 `pending` = 0,
2529                                 `writable` = 1
2530                                 WHERE `id` = %d
2531                                 ",
2532                                 intval($new_relation),
2533                                 DBA::escape(DateTimeFormat::utcNow()),
2534                                 DBA::escape(DateTimeFormat::utcNow()),
2535                                 intval($contact_record["id"])
2536                         );
2537
2538                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2539                         if (DBA::isResult($user)) {
2540                                 Logger::log("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2541                                 self::sendShare($user, $contact_record);
2542
2543                                 // Send the profile data, maybe it weren't transmitted before
2544                                 self::sendProfile($importer["uid"], [$contact_record]);
2545                         }
2546                 }
2547
2548                 return true;
2549         }
2550
2551         /**
2552          * @brief Fetches a message with a given guid
2553          *
2554          * @param string $guid        message guid
2555          * @param string $orig_author handle of the original post
2556          * @return array The fetched item
2557          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2558          * @throws \ImagickException
2559          */
2560         public static function originalItem($guid, $orig_author)
2561         {
2562                 if (empty($guid)) {
2563                         Logger::log('Empty guid. Quitting.');
2564                         return false;
2565                 }
2566
2567                 // Do we already have this item?
2568                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2569                         'author-name', 'author-link', 'author-avatar'];
2570                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2571                 $item = Item::selectFirst($fields, $condition);
2572
2573                 if (DBA::isResult($item)) {
2574                         Logger::log("reshared message ".$guid." already exists on system.");
2575
2576                         // Maybe it is already a reshared item?
2577                         // Then refetch the content, if it is a reshare from a reshare.
2578                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2579                         if (self::isReshare($item["body"], true)) {
2580                                 $item = [];
2581                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2582                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2583
2584                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2585
2586                                 // Add OEmbed and other information to the body
2587                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2588
2589                                 return $item;
2590                         } else {
2591                                 return $item;
2592                         }
2593                 }
2594
2595                 if (!DBA::isResult($item)) {
2596                         if (empty($orig_author)) {
2597                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2598                                 return false;
2599                         }
2600
2601                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2602                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2603                         $stored = self::storeByGuid($guid, $server);
2604
2605                         if (!$stored) {
2606                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2607                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2608                                 $stored = self::storeByGuid($guid, $server);
2609                         }
2610
2611                         if ($stored) {
2612                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2613                                         'author-name', 'author-link', 'author-avatar'];
2614                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2615                                 $item = Item::selectFirst($fields, $condition);
2616
2617                                 if (DBA::isResult($item)) {
2618                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2619                                         if (self::isReshare($item["body"], false)) {
2620                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2621                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2622                                         }
2623
2624                                         return $item;
2625                                 }
2626                         }
2627                 }
2628                 return false;
2629         }
2630
2631         /**
2632          * @brief Processes a reshare message
2633          *
2634          * @param array  $importer Array of the importer user
2635          * @param object $data     The message object
2636          * @param string $xml      The original XML of the message
2637          *
2638          * @return int the message id
2639          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2640          * @throws \ImagickException
2641          */
2642         private static function receiveReshare(array $importer, $data, $xml)
2643         {
2644                 $author = Strings::escapeTags(XML::unescape($data->author));
2645                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2646                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2647                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2648                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2649                 /// @todo handle unprocessed property "provider_display_name"
2650                 $public = Strings::escapeTags(XML::unescape($data->public));
2651
2652                 $contact = self::allowedContactByHandle($importer, $author, false);
2653                 if (!$contact) {
2654                         return false;
2655                 }
2656
2657                 $message_id = self::messageExists($importer["uid"], $guid);
2658                 if ($message_id) {
2659                         return true;
2660                 }
2661
2662                 $original_item = self::originalItem($root_guid, $root_author);
2663                 if (!$original_item) {
2664                         return false;
2665                 }
2666
2667                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2668
2669                 $datarray = [];
2670
2671                 $datarray["uid"] = $importer["uid"];
2672                 $datarray["contact-id"] = $contact["id"];
2673                 $datarray["network"]  = Protocol::DIASPORA;
2674
2675                 $datarray["author-link"] = $contact["url"];
2676                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2677
2678                 $datarray["owner-link"] = $datarray["author-link"];
2679                 $datarray["owner-id"] = $datarray["author-id"];
2680
2681                 $datarray["guid"] = $guid;
2682                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2683
2684                 $datarray["verb"] = ACTIVITY_POST;
2685                 $datarray["gravity"] = GRAVITY_PARENT;
2686
2687                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2688                 $datarray["source"] = $xml;
2689
2690                 $prefix = share_header(
2691                         $original_item["author-name"],
2692                         $original_item["author-link"],
2693                         $original_item["author-avatar"],
2694                         $original_item["guid"],
2695                         $original_item["created"],
2696                         $orig_url
2697                 );
2698                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2699
2700                 $datarray["tag"] = $original_item["tag"];
2701                 $datarray["app"]  = $original_item["app"];
2702
2703                 $datarray["plink"] = self::plink($author, $guid);
2704                 $datarray["private"] = (($public == "false") ? 1 : 0);
2705                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2706
2707                 $datarray["object-type"] = $original_item["object-type"];
2708
2709                 self::fetchGuid($datarray);
2710                 $message_id = Item::insert($datarray);
2711
2712                 self::sendParticipation($contact, $datarray);
2713
2714                 if ($message_id) {
2715                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2716                         if ($datarray['uid'] == 0) {
2717                                 Item::distribute($message_id);
2718                         }
2719                         return true;
2720                 } else {
2721                         return false;
2722                 }
2723         }
2724
2725         /**
2726          * @brief Processes retractions
2727          *
2728          * @param array  $importer Array of the importer user
2729          * @param array  $contact  The contact of the item owner
2730          * @param object $data     The message object
2731          *
2732          * @return bool success
2733          * @throws \Exception
2734          */
2735         private static function itemRetraction(array $importer, array $contact, $data)
2736         {
2737                 $author = Strings::escapeTags(XML::unescape($data->author));
2738                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2739                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2740
2741                 $person = self::personByHandle($author);
2742                 if (!is_array($person)) {
2743                         Logger::log("unable to find author detail for ".$author);
2744                         return false;
2745                 }
2746
2747                 if (empty($contact["url"])) {
2748                         $contact["url"] = $person["url"];
2749                 }
2750
2751                 // Fetch items that are about to be deleted
2752                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2753
2754                 // When we receive a public retraction, we delete every item that we find.
2755                 if ($importer['uid'] == 0) {
2756                         $condition = ['guid' => $target_guid, 'deleted' => false];
2757                 } else {
2758                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2759                 }
2760
2761                 $r = Item::select($fields, $condition);
2762                 if (!DBA::isResult($r)) {
2763                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2764                         return false;
2765                 }
2766
2767                 while ($item = Item::fetch($r)) {
2768                         if (strstr($item['file'], '[')) {
2769                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2770                                 continue;
2771                         }
2772
2773                         // Fetch the parent item
2774                         $parent = Item::selectFirst(['author-link'], ['id' => $item["parent"]]);
2775
2776                         // Only delete it if the parent author really fits
2777                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2778                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2779                                 continue;
2780                         }
2781
2782                         Item::delete(['id' => $item['id']]);
2783
2784                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], Logger::DEBUG);
2785                 }
2786
2787                 return true;
2788         }
2789
2790         /**
2791          * @brief Receives retraction messages
2792          *
2793          * @param array  $importer Array of the importer user
2794          * @param string $sender   The sender of the message
2795          * @param object $data     The message object
2796          *
2797          * @return bool Success
2798          * @throws \Exception
2799          */
2800         private static function receiveRetraction(array $importer, $sender, $data)
2801         {
2802                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2803
2804                 $contact = self::contactByHandle($importer["uid"], $sender);
2805                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2806                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2807                         return false;
2808                 }
2809
2810                 if (!$contact) {
2811                         $contact = [];
2812                 }
2813
2814                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2815
2816                 switch ($target_type) {
2817                         case "Comment":
2818                         case "Like":
2819                         case "Post":
2820                         case "Reshare":
2821                         case "StatusMessage":
2822                                 return self::itemRetraction($importer, $contact, $data);
2823
2824                         case "PollParticipation":
2825                         case "Photo":
2826                                 // Currently unsupported
2827                                 break;
2828
2829                         default:
2830                                 Logger::log("Unknown target type ".$target_type);
2831                                 return false;
2832                 }
2833                 return true;
2834         }
2835
2836         /**
2837          * @brief Receives status messages
2838          *
2839          * @param array            $importer Array of the importer user
2840          * @param SimpleXMLElement $data     The message object
2841          * @param string           $xml      The original XML of the message
2842          *
2843          * @return int The message id of the newly created item
2844          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2845          * @throws \ImagickException
2846          */
2847         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2848         {
2849                 $author = Strings::escapeTags(XML::unescape($data->author));
2850                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2851                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2852                 $public = Strings::escapeTags(XML::unescape($data->public));
2853                 $text = XML::unescape($data->text);
2854                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2855
2856                 $contact = self::allowedContactByHandle($importer, $author, false);
2857                 if (!$contact) {
2858                         return false;
2859                 }
2860
2861                 $message_id = self::messageExists($importer["uid"], $guid);
2862                 if ($message_id) {
2863                         return true;
2864                 }
2865
2866                 $address = [];
2867                 if ($data->location) {
2868                         foreach ($data->location->children() as $fieldname => $data) {
2869                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2870                         }
2871                 }
2872
2873                 $body = Markdown::toBBCode($text);
2874
2875                 $datarray = [];
2876
2877                 // Attach embedded pictures to the body
2878                 if ($data->photo) {
2879                         foreach ($data->photo as $photo) {
2880                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2881                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2882                         }
2883
2884                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2885                 } else {
2886                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2887
2888                         // Add OEmbed and other information to the body
2889                         if (!self::isRedmatrix($contact["url"])) {
2890                                 $body = add_page_info_to_body($body, false, true);
2891                         }
2892                 }
2893
2894                 /// @todo enable support for polls
2895                 //if ($data->poll) {
2896                 //      foreach ($data->poll AS $poll)
2897                 //              print_r($poll);
2898                 //      die("poll!\n");
2899                 //}
2900
2901                 /// @todo enable support for events
2902
2903                 $datarray["uid"] = $importer["uid"];
2904                 $datarray["contact-id"] = $contact["id"];
2905                 $datarray["network"] = Protocol::DIASPORA;
2906
2907                 $datarray["author-link"] = $contact["url"];
2908                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2909
2910                 $datarray["owner-link"] = $datarray["author-link"];
2911                 $datarray["owner-id"] = $datarray["author-id"];
2912
2913                 $datarray["guid"] = $guid;
2914                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2915
2916                 $datarray["verb"] = ACTIVITY_POST;
2917                 $datarray["gravity"] = GRAVITY_PARENT;
2918
2919                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2920                 $datarray["source"] = $xml;
2921
2922                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2923
2924                 if ($provider_display_name != "") {
2925                         $datarray["app"] = $provider_display_name;
2926                 }
2927
2928                 $datarray["plink"] = self::plink($author, $guid);
2929                 $datarray["private"] = (($public == "false") ? 1 : 0);
2930                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2931
2932                 if (isset($address["address"])) {
2933                         $datarray["location"] = $address["address"];
2934                 }
2935
2936                 if (isset($address["lat"]) && isset($address["lng"])) {
2937                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2938                 }
2939
2940                 self::fetchGuid($datarray);
2941                 $message_id = Item::insert($datarray);
2942
2943                 self::sendParticipation($contact, $datarray);
2944
2945                 if ($message_id) {
2946                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2947                         if ($datarray['uid'] == 0) {
2948                                 Item::distribute($message_id);
2949                         }
2950                         return true;
2951                 } else {
2952                         return false;
2953                 }
2954         }
2955
2956         /* ************************************************************************************** *
2957          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2958          * ************************************************************************************** */
2959
2960         /**
2961          * @brief returnes the handle of a contact
2962          *
2963          * @param array $contact contact array
2964          *
2965          * @return string the handle in the format user@domain.tld
2966          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2967          */
2968         private static function myHandle(array $contact)
2969         {
2970                 if (!empty($contact["addr"])) {
2971                         return $contact["addr"];
2972                 }
2973
2974                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2975                 // So - just in case - we build the the address here.
2976                 if ($contact["nickname"] != "") {
2977                         $nick = $contact["nickname"];
2978                 } else {
2979                         $nick = $contact["nick"];
2980                 }
2981
2982                 return $nick . "@" . substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
2983         }
2984
2985
2986         /**
2987          * @brief Creates the data for a private message in the new format
2988          *
2989          * @param string $msg     The message that is to be transmitted
2990          * @param array  $user    The record of the sender
2991          * @param array  $contact Target of the communication
2992          * @param string $prvkey  The private key of the sender
2993          * @param string $pubkey  The public key of the receiver
2994          *
2995          * @return string The encrypted data
2996          * @throws \Exception
2997          */
2998         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2999         {
3000                 Logger::log("Message: ".$msg, Logger::DATA);
3001
3002                 // without a public key nothing will work
3003                 if (!$pubkey) {
3004                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
3005                         return false;
3006                 }
3007
3008                 $aes_key = openssl_random_pseudo_bytes(32);
3009                 $b_aes_key = base64_encode($aes_key);
3010                 $iv = openssl_random_pseudo_bytes(16);
3011                 $b_iv = base64_encode($iv);
3012
3013                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3014
3015                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3016
3017                 $encrypted_key_bundle = "";
3018                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3019
3020                 $json_object = json_encode(
3021                         ["aes_key" => base64_encode($encrypted_key_bundle),
3022                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3023                 );
3024
3025                 return $json_object;
3026         }
3027
3028         /**
3029          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3030          *
3031          * @param string $msg  The message that is to be transmitted
3032          * @param array  $user The record of the sender
3033          *
3034          * @return string The envelope
3035          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3036          */
3037         public static function buildMagicEnvelope($msg, array $user)
3038         {
3039                 $b64url_data = Strings::base64UrlEncode($msg);
3040                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3041
3042                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
3043                 $type = "application/xml";
3044                 $encoding = "base64url";
3045                 $alg = "RSA-SHA256";
3046                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
3047
3048                 // Fallback if the private key wasn't transmitted in the expected field
3049                 if ($user['uprvkey'] == "") {
3050                         $user['uprvkey'] = $user['prvkey'];
3051                 }
3052
3053                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3054                 $sig = Strings::base64UrlEncode($signature);
3055
3056                 $xmldata = ["me:env" => ["me:data" => $data,
3057                                                         "@attributes" => ["type" => $type],
3058                                                         "me:encoding" => $encoding,
3059                                                         "me:alg" => $alg,
3060                                                         "me:sig" => $sig,
3061                                                         "@attributes2" => ["key_id" => $key_id]]];
3062
3063                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3064
3065                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3066         }
3067
3068         /**
3069          * @brief Create the envelope for a message
3070          *
3071          * @param string $msg     The message that is to be transmitted
3072          * @param array  $user    The record of the sender
3073          * @param array  $contact Target of the communication
3074          * @param string $prvkey  The private key of the sender
3075          * @param string $pubkey  The public key of the receiver
3076          * @param bool   $public  Is the message public?
3077          *
3078          * @return string The message that will be transmitted to other servers
3079          * @throws \Exception
3080          */
3081         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3082         {
3083                 // The message is put into an envelope with the sender's signature
3084                 $envelope = self::buildMagicEnvelope($msg, $user);
3085
3086                 // Private messages are put into a second envelope, encrypted with the receivers public key
3087                 if (!$public) {
3088                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3089                 }
3090
3091                 return $envelope;
3092         }
3093
3094         /**
3095          * @brief Creates a signature for a message
3096          *
3097          * @param array $owner   the array of the owner of the message
3098          * @param array $message The message that is to be signed
3099          *
3100          * @return string The signature
3101          */
3102         private static function signature($owner, $message)
3103         {
3104                 $sigmsg = $message;
3105                 unset($sigmsg["author_signature"]);
3106                 unset($sigmsg["parent_author_signature"]);
3107
3108                 $signed_text = implode(";", $sigmsg);
3109
3110                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3111         }
3112
3113         /**
3114          * @brief Transmit a message to a target server
3115          *
3116          * @param array  $owner        the array of the item owner
3117          * @param array  $contact      Target of the communication
3118          * @param string $envelope     The message that is to be transmitted
3119          * @param bool   $public_batch Is it a public post?
3120          * @param bool   $queue_run    Is the transmission called from the queue?
3121          * @param string $guid         message guid
3122          *
3123          * @param bool   $no_queue
3124          * @return int Result of the transmission
3125          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3126          * @throws \ImagickException
3127          */
3128         public static function transmit(array $owner, array $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
3129         {
3130                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3131                 if (!$enabled) {
3132                         return 200;
3133                 }
3134
3135                 $logid = Strings::getRandomHex(4);
3136
3137                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3138
3139                 // We always try to use the data from the fcontact table.
3140                 // This is important for transmitting data to Friendica servers.
3141                 if (!empty($contact['addr'])) {
3142                         $fcontact = self::personByHandle($contact['addr']);
3143                         if (!empty($fcontact)) {
3144                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3145                         }
3146                 }
3147
3148                 if (!$dest_url) {
3149                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3150                         return 0;
3151                 }
3152
3153                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3154
3155                 if (!$queue_run && Queue::wasDelayed($contact["id"])) {
3156                         $return_code = 0;
3157                 } else {
3158                         if (!intval(Config::get("system", "diaspora_test"))) {
3159                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3160
3161                                 $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3162                                 $return_code = $postResult->getReturnCode();
3163                         } else {
3164                                 Logger::log("test_mode");
3165                                 return 200;
3166                         }
3167                 }
3168
3169                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3170
3171                 if (!$return_code || (($return_code == 503) && (stristr($postResult->getHeader(), "retry-after")))) {
3172                         if (!$no_queue && !empty($contact['contact-type']) && ($contact['contact-type'] != Contact::TYPE_RELAY)) {
3173                                 Logger::log("queue message");
3174                                 // queue message for redelivery
3175                                 Queue::add($contact["id"], Protocol::DIASPORA, $envelope, $public_batch, $guid);
3176                         }
3177
3178                         // The message could not be delivered. We mark the contact as "dead"
3179                         Contact::markForArchival($contact);
3180                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3181                         // We successfully delivered a message, the contact is alive
3182                         Contact::unmarkForArchival($contact);
3183                 }
3184
3185                 return $return_code ? $return_code : -1;
3186         }
3187
3188
3189         /**
3190          * @brief Build the post xml
3191          *
3192          * @param string $type    The message type
3193          * @param array  $message The message data
3194          *
3195          * @return string The post XML
3196          */
3197         public static function buildPostXml($type, $message)
3198         {
3199                 $data = [$type => $message];
3200
3201                 return XML::fromArray($data, $xml);
3202         }
3203
3204         /**
3205          * @brief Builds and transmit messages
3206          *
3207          * @param array  $owner        the array of the item owner
3208          * @param array  $contact      Target of the communication
3209          * @param string $type         The message type
3210          * @param array  $message      The message data
3211          * @param bool   $public_batch Is it a public post?
3212          * @param string $guid         message guid
3213          * @param bool   $spool        Should the transmission be spooled or transmitted?
3214          *
3215          * @return int Result of the transmission
3216          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3217          * @throws \ImagickException
3218          */
3219         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3220         {
3221                 $msg = self::buildPostXml($type, $message);
3222
3223                 Logger::log('message: '.$msg, Logger::DATA);
3224                 Logger::log('send guid '.$guid, Logger::DEBUG);
3225
3226                 // Fallback if the private key wasn't transmitted in the expected field
3227                 if (empty($owner['uprvkey'])) {
3228                         $owner['uprvkey'] = $owner['prvkey'];
3229                 }
3230
3231                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3232
3233                 if ($spool) {
3234                         Queue::add($contact['id'], Protocol::DIASPORA, $envelope, $public_batch, $guid);
3235                         return true;
3236                 } else {
3237                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3238                 }
3239
3240                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3241
3242                 return $return_code;
3243         }
3244
3245         /**
3246          * @brief sends a participation (Used to get all further updates)
3247          *
3248          * @param array $contact Target of the communication
3249          * @param array $item    Item array
3250          *
3251          * @return int The result of the transmission
3252          * @throws \Exception
3253          */
3254         private static function sendParticipation(array $contact, array $item)
3255         {
3256                 // Don't send notifications for private postings
3257                 if ($item['private']) {
3258                         return;
3259                 }
3260
3261                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3262
3263                 $result = Cache::get($cachekey);
3264                 if (!is_null($result)) {
3265                         return;
3266                 }
3267
3268                 // Fetch some user id to have a valid handle to transmit the participation.
3269                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3270                 // If the item belongs to a user, we take this user id.
3271                 if ($item['uid'] == 0) {
3272                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3273                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3274                         $owner = User::getOwnerDataById($first_user['uid']);
3275                 } else {
3276                         $owner = User::getOwnerDataById($item['uid']);
3277                 }
3278
3279                 $author = self::myHandle($owner);
3280
3281                 $message = ["author" => $author,
3282                                 "guid" => System::createUUID(),
3283                                 "parent_type" => "Post",
3284                                 "parent_guid" => $item["guid"]];
3285
3286                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3287
3288                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3289                 Cache::set($cachekey, $item["guid"], Cache::QUARTER_HOUR);
3290
3291                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3292         }
3293
3294         /**
3295          * @brief sends an account migration
3296          *
3297          * @param array $owner   the array of the item owner
3298          * @param array $contact Target of the communication
3299          * @param int   $uid     User ID
3300          *
3301          * @return int The result of the transmission
3302          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3303          * @throws \ImagickException
3304          */
3305         public static function sendAccountMigration(array $owner, array $contact, $uid)
3306         {
3307                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3308                 $profile = self::createProfileData($uid);
3309
3310                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3311                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3312
3313                 $message = ["author" => $old_handle,
3314                                 "profile" => $profile,
3315                                 "signature" => $signature];
3316
3317                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3318
3319                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3320         }
3321
3322         /**
3323          * @brief Sends a "share" message
3324          *
3325          * @param array $owner   the array of the item owner
3326          * @param array $contact Target of the communication
3327          *
3328          * @return int The result of the transmission
3329          * @throws \Exception
3330          */
3331         public static function sendShare(array $owner, array $contact)
3332         {
3333                 /**
3334                  * @todo support the different possible combinations of "following" and "sharing"
3335                  * Currently, Diaspora only interprets the "sharing" field
3336                  *
3337                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3338                  */
3339
3340                 /*
3341                 switch ($contact["rel"]) {
3342                         case Contact::FRIEND:
3343                                 $following = true;
3344                                 $sharing = true;
3345
3346                         case Contact::SHARING:
3347                                 $following = false;
3348                                 $sharing = true;
3349
3350                         case Contact::FOLLOWER:
3351                                 $following = true;
3352                                 $sharing = false;
3353                 }
3354                 */
3355
3356                 $message = ["author" => self::myHandle($owner),
3357                                 "recipient" => $contact["addr"],
3358                                 "following" => "true",
3359                                 "sharing" => "true"];
3360
3361                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3362
3363                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3364         }
3365
3366         /**
3367          * @brief sends an "unshare"
3368          *
3369          * @param array $owner   the array of the item owner
3370          * @param array $contact Target of the communication
3371          *
3372          * @return int The result of the transmission
3373          * @throws \Exception
3374          */
3375         public static function sendUnshare(array $owner, array $contact)
3376         {
3377                 $message = ["author" => self::myHandle($owner),
3378                                 "recipient" => $contact["addr"],
3379                                 "following" => "false",
3380                                 "sharing" => "false"];
3381
3382                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3383
3384                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3385         }
3386
3387         /**
3388          * @brief Checks a message body if it is a reshare
3389          *
3390          * @param string $body     The message body that is to be check
3391          * @param bool   $complete Should it be a complete check or a simple check?
3392          *
3393          * @return array|bool Reshare details or "false" if no reshare
3394          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3395          * @throws \ImagickException
3396          */
3397         public static function isReshare($body, $complete = true)
3398         {
3399                 $body = trim($body);
3400
3401                 // Skip if it isn't a pure repeated messages
3402                 // Does it start with a share?
3403                 if ((strpos($body, "[share") > 0) && $complete) {
3404                         return false;
3405                 }
3406
3407                 // Does it end with a share?
3408                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3409                         return false;
3410                 }
3411
3412                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3413                 // Skip if there is no shared message in there
3414                 if ($body == $attributes) {
3415                         return false;
3416                 }
3417
3418                 // If we don't do the complete check we quit here
3419
3420                 $guid = "";
3421                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3422                 if (!empty($matches[1])) {
3423                         $guid = $matches[1];
3424                 }
3425
3426                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3427                 if (!empty($matches[1])) {
3428                         $guid = $matches[1];
3429                 }
3430
3431                 if (($guid != "") && $complete) {
3432                         $condition = ['guid' => $guid, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3433                         $item = Item::selectFirst(['contact-id'], $condition);
3434                         if (DBA::isResult($item)) {
3435                                 $ret= [];
3436                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3437                                 $ret["root_guid"] = $guid;
3438                                 return $ret;
3439                         } elseif ($complete) {
3440                                 // We are resharing something that isn't a DFRN or Diaspora post.
3441                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3442                                 return false;
3443                         }
3444                 } elseif (($guid == "") && $complete) {
3445                         return false;
3446                 }
3447
3448                 $ret["root_guid"] = $guid;
3449
3450                 $profile = "";
3451                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3452                 if (!empty($matches[1])) {
3453                         $profile = $matches[1];
3454                 }
3455
3456                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3457                 if (!empty($matches[1])) {
3458                         $profile = $matches[1];
3459                 }
3460
3461                 $ret= [];
3462
3463                 if ($profile != "") {
3464                         if (Contact::getIdForURL($profile)) {
3465                                 $author = Contact::getDetailsByURL($profile);
3466                                 $ret["root_handle"] = $author['addr'];
3467                         }
3468                 }
3469
3470                 if (empty($ret) && !$complete) {
3471                         return true;
3472                 }
3473
3474                 return $ret;
3475         }
3476
3477         /**
3478          * @brief Create an event array
3479          *
3480          * @param integer $event_id The id of the event
3481          *
3482          * @return array with event data
3483          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3484          */
3485         private static function buildEvent($event_id)
3486         {
3487                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3488                 if (!DBA::isResult($r)) {
3489                         return [];
3490                 }
3491
3492                 $event = $r[0];
3493
3494                 $eventdata = [];
3495
3496                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3497                 if (!DBA::isResult($r)) {
3498                         return [];
3499                 }
3500
3501                 $user = $r[0];
3502
3503                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3504                 if (!DBA::isResult($r)) {
3505                         return [];
3506                 }
3507
3508                 $owner = $r[0];
3509
3510                 $eventdata['author'] = self::myHandle($owner);
3511
3512                 if ($event['guid']) {
3513                         $eventdata['guid'] = $event['guid'];
3514                 }
3515
3516                 $mask = DateTimeFormat::ATOM;
3517
3518                 /// @todo - establish "all day" events in Friendica
3519                 $eventdata["all_day"] = "false";
3520
3521                 $eventdata['timezone'] = 'UTC';
3522                 if (!$event['adjust'] && $user['timezone']) {
3523                         $eventdata['timezone'] = $user['timezone'];
3524                 }
3525
3526                 if ($event['start']) {
3527                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3528                 }
3529                 if ($event['finish'] && !$event['nofinish']) {
3530                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3531                 }
3532                 if ($event['summary']) {
3533                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3534                 }
3535                 if ($event['desc']) {
3536                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3537                 }
3538                 if ($event['location']) {
3539                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3540                         $coord = Map::getCoordinates($event['location']);
3541
3542                         $location = [];
3543                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3544                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3545                                 $location["lat"] = $coord['lat'];
3546                                 $location["lng"] = $coord['lon'];
3547                         } else {
3548                                 $location["lat"] = 0;
3549                                 $location["lng"] = 0;
3550                         }
3551                         $eventdata['location'] = $location;
3552                 }
3553
3554                 return $eventdata;
3555         }
3556
3557         /**
3558          * @brief Create a post (status message or reshare)
3559          *
3560          * @param array $item  The item that will be exported
3561          * @param array $owner the array of the item owner
3562          *
3563          * @return array
3564          * 'type' -> Message type ("status_message" or "reshare")
3565          * 'message' -> Array of XML elements of the status
3566          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3567          * @throws \ImagickException
3568          */
3569         public static function buildStatus(array $item, array $owner)
3570         {
3571                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3572
3573                 $result = Cache::get($cachekey);
3574                 if (!is_null($result)) {
3575                         return $result;
3576                 }
3577
3578                 $myaddr = self::myHandle($owner);
3579
3580                 $public = ($item["private"] ? "false" : "true");
3581
3582                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3583
3584                 // Detect a share element and do a reshare
3585                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3586                         $message = ["author" => $myaddr,
3587                                         "guid" => $item["guid"],
3588                                         "created_at" => $created,
3589                                         "root_author" => $ret["root_handle"],
3590                                         "root_guid" => $ret["root_guid"],
3591                                         "provider_display_name" => $item["app"],
3592                                         "public" => $public];
3593
3594                         $type = "reshare";
3595                 } else {
3596                         $title = $item["title"];
3597                         $body = $item["body"];
3598
3599                         if ($item['author-link'] != $item['owner-link']) {
3600                                 require_once 'mod/share.php';
3601                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3602                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3603                         }
3604
3605                         // convert to markdown
3606                         $body = html_entity_decode(BBCode::toMarkdown($body));
3607
3608                         // Adding the title
3609                         if (strlen($title)) {
3610                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3611                         }
3612
3613                         if ($item["attach"]) {
3614                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3615                                 if ($cnt) {
3616                                         $body .= "\n".L10n::t("Attachments:")."\n";
3617                                         foreach ($matches as $mtch) {
3618                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3619                                         }
3620                                 }
3621                         }
3622
3623                         $location = [];
3624
3625                         if ($item["location"] != "")
3626                                 $location["address"] = $item["location"];
3627
3628                         if ($item["coord"] != "") {
3629                                 $coord = explode(" ", $item["coord"]);
3630                                 $location["lat"] = $coord[0];
3631                                 $location["lng"] = $coord[1];
3632                         }
3633
3634                         $message = ["author" => $myaddr,
3635                                         "guid" => $item["guid"],
3636                                         "created_at" => $created,
3637                                         "public" => $public,
3638                                         "text" => $body,
3639                                         "provider_display_name" => $item["app"],
3640                                         "location" => $location];
3641
3642                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3643                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3644                                 unset($message["location"]);
3645                         }
3646
3647                         if ($item['event-id'] > 0) {
3648                                 $event = self::buildEvent($item['event-id']);
3649                                 if (count($event)) {
3650                                         $message['event'] = $event;
3651
3652                                         if (!empty($event['location']['address']) &&
3653                                                 !empty($event['location']['lat']) &&
3654                                                 !empty($event['location']['lng'])) {
3655                                                 $message['location'] = $event['location'];
3656                                         }
3657
3658                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3659                                         // $message['text'] = '';
3660                                 }
3661                         }
3662
3663                         $type = "status_message";
3664                 }
3665
3666                 $msg = ["type" => $type, "message" => $message];
3667
3668                 Cache::set($cachekey, $msg, Cache::QUARTER_HOUR);
3669
3670                 return $msg;
3671         }
3672
3673         private static function prependParentAuthorMention($body, $profile_url)
3674         {
3675                 $profile = Contact::getDetailsByURL($profile_url);
3676                 if (!empty($profile['addr'])
3677                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3678                         && !strstr($body, $profile['addr'])
3679                         && !strstr($body, $profile_url)
3680                 ) {
3681                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3682                 }
3683
3684                 return $body;
3685         }
3686
3687         /**
3688          * @brief Sends a post
3689          *
3690          * @param array $item         The item that will be exported
3691          * @param array $owner        the array of the item owner
3692          * @param array $contact      Target of the communication
3693          * @param bool  $public_batch Is it a public post?
3694          *
3695          * @return int The result of the transmission
3696          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3697          * @throws \ImagickException
3698          */
3699         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3700         {
3701                 $status = self::buildStatus($item, $owner);
3702
3703                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3704         }
3705
3706         /**
3707          * @brief Creates a "like" 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 a "like"
3713          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3714          */
3715         private static function constructLike(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                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3723                 $positive = null;
3724                 if ($item['verb'] === ACTIVITY_LIKE) {
3725                         $positive = "true";
3726                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3727                         $positive = "false";
3728                 }
3729
3730                 return(["author" => self::myHandle($owner),
3731                                 "guid" => $item["guid"],
3732                                 "parent_guid" => $parent["guid"],
3733                                 "parent_type" => $target_type,
3734                                 "positive" => $positive,
3735                                 "author_signature" => ""]);
3736         }
3737
3738         /**
3739          * @brief Creates an "EventParticipation" object
3740          *
3741          * @param array $item  The item that will be exported
3742          * @param array $owner the array of the item owner
3743          *
3744          * @return array The data for an "EventParticipation"
3745          * @throws \Exception
3746          */
3747         private static function constructAttend(array $item, array $owner)
3748         {
3749                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3750                 if (!DBA::isResult($parent)) {
3751                         return false;
3752                 }
3753
3754                 switch ($item['verb']) {
3755                         case ACTIVITY_ATTEND:
3756                                 $attend_answer = 'accepted';
3757                                 break;
3758                         case ACTIVITY_ATTENDNO:
3759                                 $attend_answer = 'declined';
3760                                 break;
3761                         case ACTIVITY_ATTENDMAYBE:
3762                                 $attend_answer = 'tentative';
3763                                 break;
3764                         default:
3765                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3766                                 return false;
3767                 }
3768
3769                 return(["author" => self::myHandle($owner),
3770                                 "guid" => $item["guid"],
3771                                 "parent_guid" => $parent["guid"],
3772                                 "status" => $attend_answer,
3773                                 "author_signature" => ""]);
3774         }
3775
3776         /**
3777          * @brief Creates the object for a comment
3778          *
3779          * @param array $item  The item that will be exported
3780          * @param array $owner the array of the item owner
3781          *
3782          * @return array|false The data for a comment
3783          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3784          */
3785         private static function constructComment(array $item, array $owner)
3786         {
3787                 $cachekey = "diaspora:constructComment:".$item['guid'];
3788
3789                 $result = Cache::get($cachekey);
3790                 if (!is_null($result)) {
3791                         return $result;
3792                 }
3793
3794                 $toplevel_item = Item::selectFirst(['guid', 'author-link'], ['id' => $item["parent"], 'parent' => $item["parent"]]);
3795                 if (!DBA::isResult($toplevel_item)) {
3796                         Logger::error('Missing parent conversation item', ['parent' => $item["parent"]]);
3797                         return false;
3798                 }
3799
3800                 $thread_parent_item = $toplevel_item;
3801                 if ($item['thr-parent'] != $item['parent-uri']) {
3802                         $thread_parent_item = Item::selectFirst(['guid', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3803                 }
3804
3805                 $body = $item["body"];
3806
3807                 if ((empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3808                         && !Config::get('system', 'disable_implicit_mentions')
3809                 ) {
3810                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3811                 }
3812
3813                 $text = html_entity_decode(BBCode::toMarkdown($body));
3814                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3815
3816                 $comment = [
3817                         "author"      => self::myHandle($owner),
3818                         "guid"        => $item["guid"],
3819                         "created_at"  => $created,
3820                         "parent_guid" => $toplevel_item["guid"],
3821                         "text"        => $text,
3822                         "author_signature" => ""
3823                 ];
3824
3825                 // Send the thread parent guid only if it is a threaded comment
3826                 if ($item['thr-parent'] != $item['parent-uri']) {
3827                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3828                 }
3829
3830                 Cache::set($cachekey, $comment, Cache::QUARTER_HOUR);
3831
3832                 return($comment);
3833         }
3834
3835         /**
3836          * @brief Send a like or a comment
3837          *
3838          * @param array $item         The item that will be exported
3839          * @param array $owner        the array of the item owner
3840          * @param array $contact      Target of the communication
3841          * @param bool  $public_batch Is it a public post?
3842          *
3843          * @return int The result of the transmission
3844          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3845          * @throws \ImagickException
3846          */
3847         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3848         {
3849                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3850                         $message = self::constructAttend($item, $owner);
3851                         $type = "event_participation";
3852                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3853                         $message = self::constructLike($item, $owner);
3854                         $type = "like";
3855                 } elseif (!in_array($item["verb"], [ACTIVITY_FOLLOW])) {
3856                         $message = self::constructComment($item, $owner);
3857                         $type = "comment";
3858                 }
3859
3860                 if (empty($message)) {
3861                         return false;
3862                 }
3863
3864                 $message["author_signature"] = self::signature($owner, $message);
3865
3866                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3867         }
3868
3869         /**
3870          * @brief Creates a message from a signature record entry
3871          *
3872          * @param array $item The item that will be exported
3873          * @return array The message
3874          */
3875         private static function messageFromSignature(array $item)
3876         {
3877                 // Split the signed text
3878                 $signed_parts = explode(";", $item['signed_text']);
3879
3880                 if ($item["deleted"]) {
3881                         $message = ["author" => $item['signer'],
3882                                         "target_guid" => $signed_parts[0],
3883                                         "target_type" => $signed_parts[1]];
3884                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3885                         $message = ["author" => $signed_parts[4],
3886                                         "guid" => $signed_parts[1],
3887                                         "parent_guid" => $signed_parts[3],
3888                                         "parent_type" => $signed_parts[2],
3889                                         "positive" => $signed_parts[0],
3890                                         "author_signature" => $item['signature'],
3891                                         "parent_author_signature" => ""];
3892                 } else {
3893                         // Remove the comment guid
3894                         $guid = array_shift($signed_parts);
3895
3896                         // Remove the parent guid
3897                         $parent_guid = array_shift($signed_parts);
3898
3899                         // Remove the handle
3900                         $handle = array_pop($signed_parts);
3901
3902                         $message = [
3903                                 "author" => $handle,
3904                                 "guid" => $guid,
3905                                 "parent_guid" => $parent_guid,
3906                                 "text" => implode(";", $signed_parts),
3907                                 "author_signature" => $item['signature'],
3908                                 "parent_author_signature" => ""
3909                         ];
3910                 }
3911                 return $message;
3912         }
3913
3914         /**
3915          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3916          *
3917          * @param array $item         The item that will be exported
3918          * @param array $owner        the array of the item owner
3919          * @param array $contact      Target of the communication
3920          * @param bool  $public_batch Is it a public post?
3921          *
3922          * @return int The result of the transmission
3923          * @throws \Exception
3924          */
3925         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3926         {
3927                 if ($item["deleted"]) {
3928                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3929                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3930                         $type = "like";
3931                 } else {
3932                         $type = "comment";
3933                 }
3934
3935                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3936
3937                 // Old way - is used by the internal Friendica functions
3938                 /// @todo Change all signatur storing functions to the new format
3939                 if ($item['signed_text'] && $item['signature'] && $item['signer']) {
3940                         $message = self::messageFromSignature($item);
3941                 } else {// New way
3942                         $msg = json_decode($item['signed_text'], true);
3943
3944                         $message = [];
3945                         if (is_array($msg)) {
3946                                 foreach ($msg as $field => $data) {
3947                                         if (!$item["deleted"]) {
3948                                                 if ($field == "diaspora_handle") {
3949                                                         $field = "author";
3950                                                 }
3951                                                 if ($field == "target_type") {
3952                                                         $field = "parent_type";
3953                                                 }
3954                                         }
3955
3956                                         $message[$field] = $data;
3957                                 }
3958                         } else {
3959                                 Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3960                         }
3961                 }
3962
3963                 $message["parent_author_signature"] = self::signature($owner, $message);
3964
3965                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
3966
3967                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3968         }
3969
3970         /**
3971          * @brief Sends a retraction (deletion) of a message, like or comment
3972          *
3973          * @param array $item         The item that will be exported
3974          * @param array $owner        the array of the item owner
3975          * @param array $contact      Target of the communication
3976          * @param bool  $public_batch Is it a public post?
3977          * @param bool  $relay        Is the retraction transmitted from a relay?
3978          *
3979          * @return int The result of the transmission
3980          * @throws \Exception
3981          */
3982         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3983         {
3984                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3985
3986                 $msg_type = "retraction";
3987
3988                 if ($item['id'] == $item['parent']) {
3989                         $target_type = "Post";
3990                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3991                         $target_type = "Like";
3992                 } else {
3993                         $target_type = "Comment";
3994                 }
3995
3996                 $message = ["author" => $itemaddr,
3997                                 "target_guid" => $item['guid'],
3998                                 "target_type" => $target_type];
3999
4000                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
4001
4002                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
4003         }
4004
4005         /**
4006          * @brief Sends a mail
4007          *
4008          * @param array $item    The item that will be exported
4009          * @param array $owner   The owner
4010          * @param array $contact Target of the communication
4011          *
4012          * @return int The result of the transmission
4013          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4014          * @throws \ImagickException
4015          */
4016         public static function sendMail(array $item, array $owner, array $contact)
4017         {
4018                 $myaddr = self::myHandle($owner);
4019
4020                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
4021                 if (!DBA::isResult($cnv)) {
4022                         Logger::log("conversation not found.");
4023                         return;
4024                 }
4025
4026                 $body = BBCode::toMarkdown($item["body"]);
4027                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4028
4029                 $msg = [
4030                         "author" => $myaddr,
4031                         "guid" => $item["guid"],
4032                         "conversation_guid" => $cnv["guid"],
4033                         "text" => $body,
4034                         "created_at" => $created,
4035                 ];
4036
4037                 if ($item["reply"]) {
4038                         $message = $msg;
4039                         $type = "message";
4040                 } else {
4041                         $message = [
4042                                 "author" => $cnv["creator"],
4043                                 "guid" => $cnv["guid"],
4044                                 "subject" => $cnv["subject"],
4045                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4046                                 "participants" => $cnv["recips"],
4047                                 "message" => $msg
4048                         ];
4049
4050                         $type = "conversation";
4051                 }
4052
4053                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4054         }
4055
4056         /**
4057          * @brief Split a name into first name and last name
4058          *
4059          * @param string $name The name
4060          *
4061          * @return array The array with "first" and "last"
4062          */
4063         public static function splitName($name) {
4064                 $name = trim($name);
4065
4066                 // Is the name longer than 64 characters? Then cut the rest of it.
4067                 if (strlen($name) > 64) {
4068                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4069                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4070                         } else {
4071                                 $name = substr($name, 0, 64);
4072                         }
4073                 }
4074
4075                 // Take the first word as first name
4076                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4077                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4078                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4079                         return ['first' => $first, 'last' => $last];
4080                 }
4081
4082                 // Take the last word as last name
4083                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4084                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4085
4086                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4087                         return ['first' => $first, 'last' => $last];
4088                 }
4089
4090                 // Take the first 32 characters if there is no space in the first 32 characters
4091                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4092                         $first = substr($name, 0, 32);
4093                         $last = substr($name, 32);
4094                         return ['first' => $first, 'last' => $last];
4095                 }
4096
4097                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4098                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4099
4100                 // Check if the last name is longer than 32 characters
4101                 if (strlen($last) > 32) {
4102                         if (strpos($last, ' ') <= 32) {
4103                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4104                         } else {
4105                                 $last = substr($last, 0, 32);
4106                         }
4107                 }
4108
4109                 return ['first' => $first, 'last' => $last];
4110         }
4111
4112         /**
4113          * @brief Create profile data
4114          *
4115          * @param int $uid The user id
4116          *
4117          * @return array The profile data
4118          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4119          */
4120         private static function createProfileData($uid)
4121         {
4122                 $r = q(
4123                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4124                         FROM `profile`
4125                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4126                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4127                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4128                         intval($uid)
4129                 );
4130
4131                 if (!$r) {
4132                         return [];
4133                 }
4134
4135                 $profile = $r[0];
4136                 $handle = $profile["addr"];
4137
4138                 $split_name = self::splitName($profile['name']);
4139                 $first = $split_name['first'];
4140                 $last = $split_name['last'];
4141
4142                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4143                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4144                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4145                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4146
4147                 $dob = null;
4148                 $about = null;
4149                 $location = null;
4150                 $tags = null;
4151                 if ($searchable === 'true') {
4152                         $dob = '';
4153
4154                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4155                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4156                                 if ($year < 1004) {
4157                                         $year = 1004;
4158                                 }
4159                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4160                         }
4161
4162                         $about = $profile['about'];
4163                         $about = strip_tags(BBCode::convert($about));
4164
4165                         $location = Profile::formatLocation($profile);
4166                         $tags = '';
4167                         if ($profile['pub_keywords']) {
4168                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4169                                 $kw = str_replace('  ', ' ', $kw);
4170                                 $arr = explode(' ', $kw);
4171                                 if (count($arr)) {
4172                                         for ($x = 0; $x < 5; $x ++) {
4173                                                 if (!empty($arr[$x])) {
4174                                                         $tags .= '#'. trim($arr[$x]) .' ';
4175                                                 }
4176                                         }
4177                                 }
4178                         }
4179                         $tags = trim($tags);
4180                 }
4181
4182                 return ["author" => $handle,
4183                                 "first_name" => $first,
4184                                 "last_name" => $last,
4185                                 "image_url" => $large,
4186                                 "image_url_medium" => $medium,
4187                                 "image_url_small" => $small,
4188                                 "birthday" => $dob,
4189                                 "gender" => $profile['gender'],
4190                                 "bio" => $about,
4191                                 "location" => $location,
4192                                 "searchable" => $searchable,
4193                                 "nsfw" => "false",
4194                                 "tag_string" => $tags];
4195         }
4196
4197         /**
4198          * @brief Sends profile data
4199          *
4200          * @param int  $uid    The user id
4201          * @param bool $recips optional, default false
4202          * @return void
4203          * @throws \Exception
4204          */
4205         public static function sendProfile($uid, $recips = false)
4206         {
4207                 if (!$uid) {
4208                         return;
4209                 }
4210
4211                 $owner = User::getOwnerDataById($uid);
4212                 if (!$owner) {
4213                         return;
4214                 }
4215
4216                 if (!$recips) {
4217                         $recips = q(
4218                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4219                                 AND `uid` = %d AND `rel` != %d",
4220                                 DBA::escape(Protocol::DIASPORA),
4221                                 intval($uid),
4222                                 intval(Contact::SHARING)
4223                         );
4224                 }
4225
4226                 if (!$recips) {
4227                         return;
4228                 }
4229
4230                 $message = self::createProfileData($uid);
4231
4232                 foreach ($recips as $recip) {
4233                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4234                         self::buildAndTransmit($owner, $recip, "profile", $message, false, "", false);
4235                 }
4236         }
4237
4238         /**
4239          * @brief Creates the signature for likes that are created on our system
4240          *
4241          * @param integer $uid  The user of that comment
4242          * @param array   $item Item array
4243          *
4244          * @return array Signed content
4245          * @throws \Exception
4246          */
4247         public static function createLikeSignature($uid, array $item)
4248         {
4249                 $owner = User::getOwnerDataById($uid);
4250                 if (empty($owner)) {
4251                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4252                         return false;
4253                 }
4254
4255                 if (!in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4256                         return false;
4257                 }
4258
4259                 $message = self::constructLike($item, $owner);
4260                 if ($message === false) {
4261                         return false;
4262                 }
4263
4264                 $message["author_signature"] = self::signature($owner, $message);
4265
4266                 return $message;
4267         }
4268
4269         /**
4270          * @brief Creates the signature for Comments that are created on our system
4271          *
4272          * @param integer $uid  The user of that comment
4273          * @param array   $item Item array
4274          *
4275          * @return array Signed content
4276          * @throws \Exception
4277          */
4278         public static function createCommentSignature($uid, array $item)
4279         {
4280                 $owner = User::getOwnerDataById($uid);
4281                 if (empty($owner)) {
4282                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4283                         return false;
4284                 }
4285
4286                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4287                 $item['thr-parent'] = $item['parent-uri'];
4288
4289                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4290                 if (!DBA::isResult($parent)) {
4291                         return;
4292                 }
4293
4294                 $item['parent-uri'] = $parent['parent-uri'];
4295
4296                 $message = self::constructComment($item, $owner);
4297                 if ($message === false) {
4298                         return false;
4299                 }
4300
4301                 $message["author_signature"] = self::signature($owner, $message);
4302
4303                 return $message;
4304         }
4305 }