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\Text\BBCode;
  14 use Friendica\Content\Text\Markdown;
  15 use Friendica\Core\Cache;
  16 use Friendica\Core\Config;
  17 use Friendica\Core\L10n;
  18 use Friendica\Core\PConfig;
  19 use Friendica\Core\System;
  20 use Friendica\Core\Worker;
  21 use Friendica\Database\DBA;
  22 use Friendica\Model\Contact;
  23 use Friendica\Model\GContact;
  24 use Friendica\Model\Group;
  25 use Friendica\Model\Item;
  26 use Friendica\Model\Profile;
  27 use Friendica\Model\Queue;
  28 use Friendica\Model\User;
  29 use Friendica\Network\Probe;
  30 use Friendica\Util\Crypto;
  31 use Friendica\Util\DateTimeFormat;
  32 use Friendica\Util\Map;
  33 use Friendica\Util\Network;
  34 use Friendica\Util\XML;
  35 use SimpleXMLElement;
  36
  37 require_once 'include/dba.php';
  38 require_once 'include/items.php';
  39
  40 /**
  41  * @brief This class contain functions to create and send Diaspora XML files
  42  *
  43  */
  44 class Diaspora
  45 {
  46         /**
  47          * @brief Return a list of relay servers
  48          *
  49          * The list contains not only the official relays but also servers that we serve directly
  50          *
  51          * @param integer $item_id  The id of the item that is sent
  52          * @param array   $contacts The previously fetched contacts
  53          *
  54          * @return array of relay servers
  55          */
  56         public static function relayList($item_id, array $contacts = [])
  57         {
  58                 $serverlist = [];
  59
  60                 // Fetching relay servers
  61                 $serverdata = Config::get("system", "relay_server");
  62
  63                 if (!empty($serverdata)) {
  64                         $servers = explode(",", $serverdata);
  65                         foreach ($servers as $server) {
  66                                 $serverlist[$server] = trim($server);
  67                         }
  68                 }
  69
  70                 if (Config::get("system", "relay_directly", false)) {
  71                         // We distribute our stuff based on the parent to ensure that the thread will be complete
  72                         $parent = Item::selectFirst(['parent'], ['id' => $item_id]);
  73                         if (!DBA::isResult($parent)) {
  74                                 return;
  75                         }
  76
  77                         // Servers that want to get all content
  78                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  79                         while ($server = DBA::fetch($servers)) {
  80                                 $serverlist[$server['url']] = $server['url'];
  81                         }
  82
  83                         // All tags of the current post
  84                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
  85                         $tags = DBA::select('term', ['term'], $condition);
  86                         $taglist = [];
  87                         while ($tag = DBA::fetch($tags)) {
  88                                 $taglist[] = $tag['term'];
  89                         }
  90
  91                         // All servers who wants content with this tag
  92                         $tagserverlist = [];
  93                         if (!empty($taglist)) {
  94                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  95                                 while ($server = DBA::fetch($tagserver)) {
  96                                         $tagserverlist[] = $server['gserver-id'];
  97                                 }
  98                         }
  99
 100                         // All adresses with the given id
 101                         if (!empty($tagserverlist)) {
 102                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 103                                 while ($server = DBA::fetch($servers)) {
 104                                         $serverlist[$server['url']] = $server['url'];
 105                                 }
 106                         }
 107                 }
 108
 109                 // Now we are collecting all relay contacts
 110                 foreach ($serverlist as $server_url) {
 111                         // We don't send messages to ourselves
 112                         if (link_compare($server_url, System::baseUrl())) {
 113                                 continue;
 114                         }
 115                         $contact = self::getRelayContact($server_url);
 116                         if (is_bool($contact)) {
 117                                 continue;
 118                         }
 119
 120                         $exists = false;
 121                         foreach ($contacts as $entry) {
 122                                 if ($entry['batch'] == $contact['batch']) {
 123                                         $exists = true;
 124                                 }
 125                         }
 126
 127                         if (!$exists) {
 128                                 $contacts[] = $contact;
 129                         }
 130                 }
 131
 132                 return $contacts;
 133         }
 134
 135         /**
 136          * @brief Return a contact for a given server address or creates a dummy entry
 137          *
 138          * @param string $server_url The url of the server
 139          * @return array with the contact
 140          */
 141         private static function getRelayContact($server_url)
 142         {
 143                 $fields = ['batch', 'id', 'name', 'network', 'archive', 'blocked'];
 144
 145                 // Fetch the relay contact
 146                 $condition = ['uid' => 0, 'nurl' => normalise_link($server_url),
 147                         'contact-type' => Contact::ACCOUNT_TYPE_RELAY];
 148                 $contact = DBA::selectFirst('contact', $fields, $condition);
 149
 150                 if (DBA::isResult($contact)) {
 151                         if ($contact['archive'] || $contact['blocked']) {
 152                                 return false;
 153                         }
 154                         return $contact;
 155                 } else {
 156                         self::setRelayContact($server_url);
 157
 158                         $contact = DBA::selectFirst('contact', $fields, $condition);
 159                         if (DBA::isResult($contact)) {
 160                                 return $contact;
 161                         }
 162                 }
 163
 164                 // It should never happen that we arrive here
 165                 return [];
 166         }
 167
 168         /**
 169          * @brief Update or insert a relay contact
 170          *
 171          * @param string $server_url The url of the server
 172          * @param array $network_fields Optional network specific fields
 173          */
 174         public static function setRelayContact($server_url, array $network_fields = [])
 175         {
 176                 $fields = ['created' => DateTimeFormat::utcNow(),
 177                         'name' => 'relay', 'nick' => 'relay',
 178                         'url' => $server_url, 'network' => NETWORK_DIASPORA,
 179                         'batch' => $server_url . '/receive/public',
 180                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 181                         'pending' => false, 'writable' => true];
 182
 183                 $fields = array_merge($fields, $network_fields);
 184
 185                 $condition = ['uid' => 0, 'nurl' => normalise_link($server_url),
 186                         'contact-type' => Contact::ACCOUNT_TYPE_RELAY];
 187
 188                 if (DBA::exists('contact', $condition)) {
 189                         unset($fields['created']);
 190                 }
 191
 192                 DBA::update('contact', $fields, $condition, true);
 193         }
 194
 195         /**
 196          * @brief Return a list of participating contacts for a thread
 197          *
 198          * This is used for the participation feature.
 199          * One of the parameters is a contact array.
 200          * This is done to avoid duplicates.
 201          *
 202          * @param integer $thread   The id of the thread
 203          * @param array   $contacts The previously fetched contacts
 204          *
 205          * @return array of relay servers
 206          */
 207         public static function participantsForThread($thread, array $contacts)
 208         {
 209                 $r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
 210                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 211                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 212                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 213                                 WHERE `participation`.`iid` = ?", $thread);
 214
 215                 while ($contact = DBA::fetch($r)) {
 216                         if (!empty($contact['fnetwork'])) {
 217                                 $contact['network'] = $contact['fnetwork'];
 218                         }
 219                         unset($contact['fnetwork']);
 220
 221                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 222                                 $contact['batch'] = $contact['fbatch'];
 223                         }
 224                         unset($contact['fbatch']);
 225
 226                         $exists = false;
 227                         foreach ($contacts as $entry) {
 228                                 if ($entry['batch'] == $contact['batch']) {
 229                                         $exists = true;
 230                                 }
 231                         }
 232
 233                         if (!$exists) {
 234                                 $contacts[] = $contact;
 235                         }
 236                 }
 237                 DBA::close($r);
 238
 239                 return $contacts;
 240         }
 241
 242         /**
 243          * @brief repairs a signature that was double encoded
 244          *
 245          * The function is unused at the moment. It was copied from the old implementation.
 246          *
 247          * @param string  $signature The signature
 248          * @param string  $handle    The handle of the signature owner
 249          * @param integer $level     This value is only set inside this function to avoid endless loops
 250          *
 251          * @return string the repaired signature
 252          */
 253         private static function repairSignature($signature, $handle = "", $level = 1)
 254         {
 255                 if ($signature == "") {
 256                         return ($signature);
 257                 }
 258
 259                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 260                         $signature = base64_decode($signature);
 261                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
 262
 263                         // Do a recursive call to be able to fix even multiple levels
 264                         if ($level < 10) {
 265                                 $signature = self::repairSignature($signature, $handle, ++$level);
 266                         }
 267                 }
 268
 269                 return($signature);
 270         }
 271
 272         /**
 273          * @brief verify the envelope and return the verified data
 274          *
 275          * @param string $envelope The magic envelope
 276          *
 277          * @return string verified data
 278          */
 279         private static function verifyMagicEnvelope($envelope)
 280         {
 281                 $basedom = XML::parseString($envelope);
 282
 283                 if (!is_object($basedom)) {
 284                         logger("Envelope is no XML file");
 285                         return false;
 286                 }
 287
 288                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 289
 290                 if (sizeof($children) == 0) {
 291                         logger("XML has no children");
 292                         return false;
 293                 }
 294
 295                 $handle = "";
 296
 297                 $data = base64url_decode($children->data);
 298                 $type = $children->data->attributes()->type[0];
 299
 300                 $encoding = $children->encoding;
 301
 302                 $alg = $children->alg;
 303
 304                 $sig = base64url_decode($children->sig);
 305                 $key_id = $children->sig->attributes()->key_id[0];
 306                 if ($key_id != "") {
 307                         $handle = base64url_decode($key_id);
 308                 }
 309
 310                 $b64url_data = base64url_encode($data);
 311                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 312
 313                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 314
 315                 if ($handle == '') {
 316                         logger('No author could be decoded. Discarding. Message: ' . $envelope);
 317                         return false;
 318                 }
 319
 320                 $key = self::key($handle);
 321                 if ($key == '') {
 322                         logger("Couldn't get a key for handle " . $handle . ". Discarding.");
 323                         return false;
 324                 }
 325
 326                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 327                 if (!$verify) {
 328                         logger('Message from ' . $handle . ' did not verify. Discarding.');
 329                         return false;
 330                 }
 331
 332                 return $data;
 333         }
 334
 335         /**
 336          * @brief encrypts data via AES
 337          *
 338          * @param string $key  The AES key
 339          * @param string $iv   The IV (is used for CBC encoding)
 340          * @param string $data The data that is to be encrypted
 341          *
 342          * @return string encrypted data
 343          */
 344         private static function aesEncrypt($key, $iv, $data)
 345         {
 346                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 347         }
 348
 349         /**
 350          * @brief decrypts data via AES
 351          *
 352          * @param string $key       The AES key
 353          * @param string $iv        The IV (is used for CBC encoding)
 354          * @param string $encrypted The encrypted data
 355          *
 356          * @return string decrypted data
 357          */
 358         private static function aesDecrypt($key, $iv, $encrypted)
 359         {
 360                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 361         }
 362
 363         /**
 364          * @brief: Decodes incoming Diaspora message in the new format
 365          *
 366          * @param array  $importer Array of the importer user
 367          * @param string $raw      raw post message
 368          *
 369          * @return array
 370          * 'message' -> decoded Diaspora XML message
 371          * 'author' -> author diaspora handle
 372          * 'key' -> author public key (converted to pkcs#8)
 373          */
 374         public static function decodeRaw(array $importer, $raw)
 375         {
 376                 $data = json_decode($raw);
 377
 378                 // Is it a private post? Then decrypt the outer Salmon
 379                 if (is_object($data)) {
 380                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 381                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 382
 383                         $outer_key_bundle = '';
 384                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 385                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 386
 387                         if (!is_object($j_outer_key_bundle)) {
 388                                 logger('Outer Salmon did not verify. Discarding.');
 389                                 System::httpExit(400);
 390                         }
 391
 392                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 393                         $outer_key = base64_decode($j_outer_key_bundle->key);
 394
 395                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 396                 } else {
 397                         $xml = $raw;
 398                 }
 399
 400                 $basedom = XML::parseString($xml);
 401
 402                 if (!is_object($basedom)) {
 403                         logger('Received data does not seem to be an XML. Discarding. '.$xml);
 404                         System::httpExit(400);
 405                 }
 406
 407                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 408
 409                 // Not sure if this cleaning is needed
 410                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 411
 412                 // Build the signed data
 413                 $type = $base->data[0]->attributes()->type[0];
 414                 $encoding = $base->encoding;
 415                 $alg = $base->alg;
 416                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 417
 418                 // This is the signature
 419                 $signature = base64url_decode($base->sig);
 420
 421                 // Get the senders' public key
 422                 $key_id = $base->sig[0]->attributes()->key_id[0];
 423                 $author_addr = base64_decode($key_id);
 424                 if ($author_addr == '') {
 425                         logger('No author could be decoded. Discarding. Message: ' . $xml);
 426                         System::httpExit(400);
 427                 }
 428
 429                 $key = self::key($author_addr);
 430                 if ($key == '') {
 431                         logger("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 432                         System::httpExit(400);
 433                 }
 434
 435                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 436                 if (!$verify) {
 437                         logger('Message did not verify. Discarding.');
 438                         System::httpExit(400);
 439                 }
 440
 441                 return ['message' => (string)base64url_decode($base->data),
 442                                 'author' => unxmlify($author_addr),
 443                                 'key' => (string)$key];
 444         }
 445
 446         /**
 447          * @brief: Decodes incoming Diaspora message in the deprecated format
 448          *
 449          * @param array  $importer Array of the importer user
 450          * @param string $xml      urldecoded Diaspora salmon
 451          *
 452          * @return array
 453          * 'message' -> decoded Diaspora XML message
 454          * 'author' -> author diaspora handle
 455          * 'key' -> author public key (converted to pkcs#8)
 456          */
 457         public static function decode(array $importer, $xml)
 458         {
 459                 $public = false;
 460                 $basedom = XML::parseString($xml);
 461
 462                 if (!is_object($basedom)) {
 463                         logger("XML is not parseable.");
 464                         return false;
 465                 }
 466                 $children = $basedom->children('https://joindiaspora.com/protocol');
 467
 468                 $inner_aes_key = null;
 469                 $inner_iv = null;
 470
 471                 if ($children->header) {
 472                         $public = true;
 473                         $author_link = str_replace('acct:', '', $children->header->author_id);
 474                 } else {
 475                         // This happens with posts from a relais
 476                         if (!$importer) {
 477                                 logger("This is no private post in the old format", LOGGER_DEBUG);
 478                                 return false;
 479                         }
 480
 481                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 482
 483                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 484                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 485
 486                         $outer_key_bundle = '';
 487                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 488
 489                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 490
 491                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 492                         $outer_key = base64_decode($j_outer_key_bundle->key);
 493
 494                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 495
 496                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 497                         $idom = XML::parseString($decrypted);
 498
 499                         $inner_iv = base64_decode($idom->iv);
 500                         $inner_aes_key = base64_decode($idom->aes_key);
 501
 502                         $author_link = str_replace('acct:', '', $idom->author_id);
 503                 }
 504
 505                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 506
 507                 // figure out where in the DOM tree our data is hiding
 508
 509                 $base = null;
 510                 if ($dom->provenance->data) {
 511                         $base = $dom->provenance;
 512                 } elseif ($dom->env->data) {
 513                         $base = $dom->env;
 514                 } elseif ($dom->data) {
 515                         $base = $dom;
 516                 }
 517
 518                 if (!$base) {
 519                         logger('unable to locate salmon data in xml');
 520                         System::httpExit(400);
 521                 }
 522
 523
 524                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 525                 $signature = base64url_decode($base->sig);
 526
 527                 // unpack the  data
 528
 529                 // strip whitespace so our data element will return to one big base64 blob
 530                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 531
 532
 533                 // stash away some other stuff for later
 534
 535                 $type = $base->data[0]->attributes()->type[0];
 536                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 537                 $encoding = $base->encoding;
 538                 $alg = $base->alg;
 539
 540
 541                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 542
 543
 544                 // decode the data
 545                 $data = base64url_decode($data);
 546
 547
 548                 if ($public) {
 549                         $inner_decrypted = $data;
 550                 } else {
 551                         // Decode the encrypted blob
 552                         $inner_encrypted = base64_decode($data);
 553                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 554                 }
 555
 556                 if (!$author_link) {
 557                         logger('Could not retrieve author URI.');
 558                         System::httpExit(400);
 559                 }
 560                 // Once we have the author URI, go to the web and try to find their public key
 561                 // (first this will look it up locally if it is in the fcontact cache)
 562                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 563
 564                 logger('Fetching key for '.$author_link);
 565                 $key = self::key($author_link);
 566
 567                 if (!$key) {
 568                         logger('Could not retrieve author key.');
 569                         System::httpExit(400);
 570                 }
 571
 572                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 573
 574                 if (!$verify) {
 575                         logger('Message did not verify. Discarding.');
 576                         System::httpExit(400);
 577                 }
 578
 579                 logger('Message verified.');
 580
 581                 return ['message' => (string)$inner_decrypted,
 582                                 'author' => unxmlify($author_link),
 583                                 'key' => (string)$key];
 584         }
 585
 586
 587         /**
 588          * @brief Dispatches public messages and find the fitting receivers
 589          *
 590          * @param array $msg The post that will be dispatched
 591          *
 592          * @return int The message id of the generated message, "true" or "false" if there was an error
 593          */
 594         public static function dispatchPublic($msg)
 595         {
 596                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 597                 if (!$enabled) {
 598                         logger("diaspora is disabled");
 599                         return false;
 600                 }
 601
 602                 if (!($fields = self::validPosting($msg))) {
 603                         logger("Invalid posting");
 604                         return false;
 605                 }
 606
 607                 $importer = ["uid" => 0, "page-flags" => Contact::PAGE_FREELOVE];
 608                 $success = self::dispatch($importer, $msg, $fields);
 609
 610                 return $success;
 611         }
 612
 613         /**
 614          * @brief Dispatches the different message types to the different functions
 615          *
 616          * @param array  $importer Array of the importer user
 617          * @param array  $msg      The post that will be dispatched
 618          * @param object $fields   SimpleXML object that contains the message
 619          *
 620          * @return int The message id of the generated message, "true" or "false" if there was an error
 621          */
 622         public static function dispatch(array $importer, $msg, $fields = null)
 623         {
 624                 // The sender is the handle of the contact that sent the message.
 625                 // This will often be different with relayed messages (for example "like" and "comment")
 626                 $sender = $msg["author"];
 627
 628                 // This is only needed for private postings since this is already done for public ones before
 629                 if (is_null($fields)) {
 630                         $private = true;
 631                         if (!($fields = self::validPosting($msg))) {
 632                                 logger("Invalid posting");
 633                                 return false;
 634                         }
 635                 } else {
 636                         $private = false;
 637                 }
 638
 639                 $type = $fields->getName();
 640
 641                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 642
 643                 switch ($type) {
 644                         case "account_migration":
 645                                 if (!$private) {
 646                                         logger('Message with type ' . $type . ' is not private, quitting.');
 647                                         return false;
 648                                 }
 649                                 return self::receiveAccountMigration($importer, $fields);
 650
 651                         case "account_deletion":
 652                                 return self::receiveAccountDeletion($fields);
 653
 654                         case "comment":
 655                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 656
 657                         case "contact":
 658                                 if (!$private) {
 659                                         logger('Message with type ' . $type . ' is not private, quitting.');
 660                                         return false;
 661                                 }
 662                                 return self::receiveContactRequest($importer, $fields);
 663
 664                         case "conversation":
 665                                 if (!$private) {
 666                                         logger('Message with type ' . $type . ' is not private, quitting.');
 667                                         return false;
 668                                 }
 669                                 return self::receiveConversation($importer, $msg, $fields);
 670
 671                         case "like":
 672                                 return self::receiveLike($importer, $sender, $fields);
 673
 674                         case "message":
 675                                 if (!$private) {
 676                                         logger('Message with type ' . $type . ' is not private, quitting.');
 677                                         return false;
 678                                 }
 679                                 return self::receiveMessage($importer, $fields);
 680
 681                         case "participation":
 682                                 if (!$private) {
 683                                         logger('Message with type ' . $type . ' is not private, quitting.');
 684                                         return false;
 685                                 }
 686                                 return self::receiveParticipation($importer, $fields);
 687
 688                         case "photo": // Not implemented
 689                                 return self::receivePhoto($importer, $fields);
 690
 691                         case "poll_participation": // Not implemented
 692                                 return self::receivePollParticipation($importer, $fields);
 693
 694                         case "profile":
 695                                 if (!$private) {
 696                                         logger('Message with type ' . $type . ' is not private, quitting.');
 697                                         return false;
 698                                 }
 699                                 return self::receiveProfile($importer, $fields);
 700
 701                         case "reshare":
 702                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 703
 704                         case "retraction":
 705                                 return self::receiveRetraction($importer, $sender, $fields);
 706
 707                         case "status_message":
 708                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 709
 710                         default:
 711                                 logger("Unknown message type ".$type);
 712                                 return false;
 713                 }
 714
 715                 return true;
 716         }
 717
 718         /**
 719          * @brief Checks if a posting is valid and fetches the data fields.
 720          *
 721          * This function does not only check the signature.
 722          * It also does the conversion between the old and the new diaspora format.
 723          *
 724          * @param array $msg Array with the XML, the sender handle and the sender signature
 725          *
 726          * @return bool|array If the posting is valid then an array with an SimpleXML object is returned
 727          */
 728         private static function validPosting($msg)
 729         {
 730                 $data = XML::parseString($msg["message"]);
 731
 732                 if (!is_object($data)) {
 733                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 734                         return false;
 735                 }
 736
 737                 // Is this the new or the old version?
 738                 if ($data->getName() == "XML") {
 739                         $oldXML = true;
 740                         foreach ($data->post->children() as $child) {
 741                                 $element = $child;
 742                         }
 743                 } else {
 744                         $oldXML = false;
 745                         $element = $data;
 746                 }
 747
 748                 $type = $element->getName();
 749                 $orig_type = $type;
 750
 751                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 752
 753                 // All retractions are handled identically from now on.
 754                 // In the new version there will only be "retraction".
 755                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 756                         $type = "retraction";
 757
 758                 if ($type == "request") {
 759                         $type = "contact";
 760                 }
 761
 762                 $fields = new SimpleXMLElement("<".$type."/>");
 763
 764                 $signed_data = "";
 765                 $author_signature = null;
 766                 $parent_author_signature = null;
 767
 768                 foreach ($element->children() as $fieldname => $entry) {
 769                         if ($oldXML) {
 770                                 // Translation for the old XML structure
 771                                 if ($fieldname == "diaspora_handle") {
 772                                         $fieldname = "author";
 773                                 }
 774                                 if ($fieldname == "participant_handles") {
 775                                         $fieldname = "participants";
 776                                 }
 777                                 if (in_array($type, ["like", "participation"])) {
 778                                         if ($fieldname == "target_type") {
 779                                                 $fieldname = "parent_type";
 780                                         }
 781                                 }
 782                                 if ($fieldname == "sender_handle") {
 783                                         $fieldname = "author";
 784                                 }
 785                                 if ($fieldname == "recipient_handle") {
 786                                         $fieldname = "recipient";
 787                                 }
 788                                 if ($fieldname == "root_diaspora_id") {
 789                                         $fieldname = "root_author";
 790                                 }
 791                                 if ($type == "status_message") {
 792                                         if ($fieldname == "raw_message") {
 793                                                 $fieldname = "text";
 794                                         }
 795                                 }
 796                                 if ($type == "retraction") {
 797                                         if ($fieldname == "post_guid") {
 798                                                 $fieldname = "target_guid";
 799                                         }
 800                                         if ($fieldname == "type") {
 801                                                 $fieldname = "target_type";
 802                                         }
 803                                 }
 804                         }
 805
 806                         if (($fieldname == "author_signature") && ($entry != "")) {
 807                                 $author_signature = base64_decode($entry);
 808                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 809                                 $parent_author_signature = base64_decode($entry);
 810                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 811                                 if ($signed_data != "") {
 812                                         $signed_data .= ";";
 813                                 }
 814
 815                                 $signed_data .= $entry;
 816                         }
 817                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 818                                 || ($orig_type == "relayable_retraction")
 819                         ) {
 820                                 XML::copy($entry, $fields, $fieldname);
 821                         }
 822                 }
 823
 824                 // This is something that shouldn't happen at all.
 825                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 826                         if ($msg["author"] != $fields->author) {
 827                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 828                                 return false;
 829                         }
 830                 }
 831
 832                 // Only some message types have signatures. So we quit here for the other types.
 833                 if (!in_array($type, ["comment", "like"])) {
 834                         return $fields;
 835                 }
 836                 // No author_signature? This is a must, so we quit.
 837                 if (!isset($author_signature)) {
 838                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 839                         return false;
 840                 }
 841
 842                 if (isset($parent_author_signature)) {
 843                         $key = self::key($msg["author"]);
 844                         if (empty($key)) {
 845                                 logger("No key found for parent author ".$msg["author"], LOGGER_DEBUG);
 846                                 return false;
 847                         }
 848
 849                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 850                                 logger("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 851                                 return false;
 852                         }
 853                 }
 854
 855                 $key = self::key($fields->author);
 856                 if (empty($key)) {
 857                         logger("No key found for author ".$fields->author, LOGGER_DEBUG);
 858                         return false;
 859                 }
 860
 861                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 862                         logger("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 863                         return false;
 864                 } else {
 865                         return $fields;
 866                 }
 867         }
 868
 869         /**
 870          * @brief Fetches the public key for a given handle
 871          *
 872          * @param string $handle The handle
 873          *
 874          * @return string The public key
 875          */
 876         private static function key($handle)
 877         {
 878                 $handle = strval($handle);
 879
 880                 logger("Fetching diaspora key for: ".$handle);
 881
 882                 $r = self::personByHandle($handle);
 883                 if ($r) {
 884                         return $r["pubkey"];
 885                 }
 886
 887                 return "";
 888         }
 889
 890         /**
 891          * @brief Fetches data for a given handle
 892          *
 893          * @param string $handle The handle
 894          *
 895          * @return array the queried data
 896          */
 897         public static function personByHandle($handle)
 898         {
 899                 $update = false;
 900
 901                 $person = DBA::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 902                 if (DBA::isResult($person)) {
 903                         logger("In cache " . print_r($person, true), LOGGER_DEBUG);
 904
 905                         // update record occasionally so it doesn't get stale
 906                         $d = strtotime($person["updated"]." +00:00");
 907                         if ($d < strtotime("now - 14 days")) {
 908                                 $update = true;
 909                         }
 910
 911                         if ($person["guid"] == "") {
 912                                 $update = true;
 913                         }
 914                 }
 915
 916                 if (!DBA::isResult($person) || $update) {
 917                         logger("create or refresh", LOGGER_DEBUG);
 918                         $r = Probe::uri($handle, NETWORK_DIASPORA);
 919
 920                         // Note that Friendica contacts will return a "Diaspora person"
 921                         // if Diaspora connectivity is enabled on their server
 922                         if ($r && ($r["network"] === NETWORK_DIASPORA)) {
 923                                 self::updateFContact($r);
 924
 925                                 // Fetch the updated or added contact
 926                                 $person = DBA::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 927                                 if (!DBA::isResult($person)) {
 928                                         $person = $r;
 929                                 }
 930                         }
 931                 }
 932
 933                 return $person;
 934         }
 935
 936         /**
 937          * @brief Updates the fcontact table
 938          *
 939          * @param array $arr The fcontact data
 940          */
 941         private static function updateFContact($arr)
 942         {
 943                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
 944                         'request' => $arr["request"], 'nick' => $arr["nick"],
 945                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
 946                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
 947                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
 948                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
 949                         'updated' => DateTimeFormat::utcNow()];
 950
 951                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
 952
 953                 DBA::update('fcontact', $fields, $condition, true);
 954         }
 955
 956         /**
 957          * @brief get a handle (user@domain.tld) from a given contact id
 958          *
 959          * @param int $contact_id  The id in the contact table
 960          * @param int $pcontact_id The id in the contact table (Used for the public contact)
 961          *
 962          * @return string the handle
 963          */
 964         private static function handleFromContact($contact_id, $pcontact_id = 0)
 965         {
 966                 $handle = false;
 967
 968                 logger("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, LOGGER_DEBUG);
 969
 970                 if ($pcontact_id != 0) {
 971                         $r = q(
 972                                 "SELECT `addr` FROM `contact` WHERE `id` = %d AND `addr` != ''",
 973                                 intval($pcontact_id)
 974                         );
 975
 976                         if (DBA::isResult($r)) {
 977                                 return strtolower($r[0]["addr"]);
 978                         }
 979                 }
 980
 981                 $r = q(
 982                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 983                         intval($contact_id)
 984                 );
 985
 986                 if (DBA::isResult($r)) {
 987                         $contact = $r[0];
 988
 989                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 990
 991                         if ($contact['addr'] != "") {
 992                                 $handle = $contact['addr'];
 993                         } else {
 994                                 $baseurl_start = strpos($contact['url'], '://') + 3;
 995                                 // allows installations in a subdirectory--not sure how Diaspora will handle
 996                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
 997                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 998                                 $handle = $contact['nick'].'@'.$baseurl;
 999                         }
1000                 }
1001
1002                 return strtolower($handle);
1003         }
1004
1005         /**
1006          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1007          * fcontact guid
1008          *
1009          * @param mixed $fcontact_guid Hexadecimal string guid
1010          *
1011          * @return string the contact url or null
1012          */
1013         public static function urlFromContactGuid($fcontact_guid)
1014         {
1015                 logger("fcontact guid is ".$fcontact_guid, LOGGER_DEBUG);
1016
1017                 $r = q(
1018                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1019                         DBA::escape(NETWORK_DIASPORA),
1020                         DBA::escape($fcontact_guid)
1021                 );
1022
1023                 if (DBA::isResult($r)) {
1024                         return $r[0]['url'];
1025                 }
1026
1027                 return null;
1028         }
1029
1030         /**
1031          * @brief Get a contact id for a given handle
1032          *
1033          * @todo Move to Friendica\Model\Contact
1034          *
1035          * @param int    $uid    The user id
1036          * @param string $handle The handle in the format user@domain.tld
1037          *
1038          * @return int Contact id
1039          */
1040         private static function contactByHandle($uid, $handle)
1041         {
1042                 $cid = Contact::getIdForURL($handle, $uid);
1043                 if (!$cid) {
1044                         $handle_parts = explode("@", $handle);
1045                         $nurl_sql = "%%://" . $handle_parts[1] . "%%/profile/" . $handle_parts[0];
1046                         $cid = Contact::getIdForURL($nurl_sql, $uid);
1047                 }
1048
1049                 if (!$cid) {
1050                         logger("Haven't found a contact for user " . $uid . " and handle " . $handle, LOGGER_DEBUG);
1051                         return false;
1052                 }
1053
1054                 $contact = dba::selectFirst('contact', [], ['id' => $cid]);
1055                 if (!DBA::isResult($contact)) {
1056                         // This here shouldn't happen at all
1057                         logger("Haven't found a contact for user " . $uid . " and handle " . $handle, LOGGER_DEBUG);
1058                         return false;
1059                 }
1060
1061                 return $contact;
1062         }
1063
1064         /**
1065          * @brief Check if posting is allowed for this contact
1066          *
1067          * @param array $importer   Array of the importer user
1068          * @param array $contact    The contact that is checked
1069          * @param bool  $is_comment Is the check for a comment?
1070          *
1071          * @return bool is the contact allowed to post?
1072          */
1073         private static function postAllow(array $importer, array $contact, $is_comment = false)
1074         {
1075                 /*
1076                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1077                  * That makes us friends.
1078                  * Normally this should have handled by getting a request - but this could get lost
1079                  */
1080                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1081                 // It is not removed by now. Possibly the code is needed?
1082                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(Contact::PAGE_FREELOVE))) {
1083                 //      dba::update(
1084                 //              'contact',
1085                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1086                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1087                 //      );
1088                 //
1089                 //      $contact["rel"] = Contact::FRIEND;
1090                 //      logger("defining user ".$contact["nick"]." as friend");
1091                 //}
1092
1093                 // We don't seem to like that person
1094                 if ($contact["blocked"]) {
1095                         // Maybe blocked, don't accept.
1096                         return false;
1097                         // We are following this person?
1098                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1099                         // Yes, then it is fine.
1100                         return true;
1101                         // Is it a post to a community?
1102                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [Contact::PAGE_COMMUNITY, Contact::PAGE_PRVGROUP])) {
1103                         // That's good
1104                         return true;
1105                         // Is the message a global user or a comment?
1106                 } elseif (($importer["uid"] == 0) || $is_comment) {
1107                         // Messages for the global users and comments are always accepted
1108                         return true;
1109                 }
1110
1111                 return false;
1112         }
1113
1114         /**
1115          * @brief Fetches the contact id for a handle and checks if posting is allowed
1116          *
1117          * @param array  $importer   Array of the importer user
1118          * @param string $handle     The checked handle in the format user@domain.tld
1119          * @param bool   $is_comment Is the check for a comment?
1120          *
1121          * @return array The contact data
1122          */
1123         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
1124         {
1125                 $contact = self::contactByHandle($importer["uid"], $handle);
1126                 if (!$contact) {
1127                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1128                         // If a contact isn't found, we accept it anyway if it is a comment
1129                         if ($is_comment && ($importer["uid"] != 0)) {
1130                                 return self::contactByHandle(0, $handle);
1131                         } elseif ($is_comment) {
1132                                 return $importer;
1133                         } else {
1134                                 return false;
1135                         }
1136                 }
1137
1138                 if (!self::postAllow($importer, $contact, $is_comment)) {
1139                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1140                         return false;
1141                 }
1142                 return $contact;
1143         }
1144
1145         /**
1146          * @brief Does the message already exists on the system?
1147          *
1148          * @param int    $uid  The user id
1149          * @param string $guid The guid of the message
1150          *
1151          * @return int|bool message id if the message already was stored into the system - or false.
1152          */
1153         private static function messageExists($uid, $guid)
1154         {
1155                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1156                 if (DBA::isResult($item)) {
1157                         logger("message ".$guid." already exists for user ".$uid);
1158                         return $item["id"];
1159                 }
1160
1161                 return false;
1162         }
1163
1164         /**
1165          * @brief Checks for links to posts in a message
1166          *
1167          * @param array $item The item array
1168          * @return void
1169          */
1170         private static function fetchGuid(array $item)
1171         {
1172                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1173                 preg_replace_callback(
1174                         $expression,
1175                         function ($match) use ($item) {
1176                                 self::fetchGuidSub($match, $item);
1177                         },
1178                         $item["body"]
1179                 );
1180
1181                 preg_replace_callback(
1182                         "&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1183                         function ($match) use ($item) {
1184                                 self::fetchGuidSub($match, $item);
1185                         },
1186                         $item["body"]
1187                 );
1188         }
1189
1190         /**
1191          * @brief Checks for relative /people/* links in an item body to match local
1192          * contacts or prepends the remote host taken from the author link.
1193          *
1194          * @param string $body        The item body to replace links from
1195          * @param string $author_link The author link for missing local contact fallback
1196          *
1197          * @return string the replaced string
1198          */
1199         public static function replacePeopleGuid($body, $author_link)
1200         {
1201                 $return = preg_replace_callback(
1202                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1203                         function ($match) use ($author_link) {
1204                                 // $match
1205                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1206                                 // 1 => '0123456789abcdef'
1207                                 // 2 => 'Foo Bar'
1208                                 $handle = self::urlFromContactGuid($match[1]);
1209
1210                                 if ($handle) {
1211                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1212                                 } else {
1213                                         // No local match, restoring absolute remote URL from author scheme and host
1214                                         $author_url = parse_url($author_link);
1215                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1216                                 }
1217
1218                                 return $return;
1219                         },
1220                         $body
1221                 );
1222
1223                 return $return;
1224         }
1225
1226         /**
1227          * @brief sub function of "fetchGuid" which checks for links in messages
1228          *
1229          * @param array $match array containing a link that has to be checked for a message link
1230          * @param array $item  The item array
1231          * @return void
1232          */
1233         private static function fetchGuidSub($match, $item)
1234         {
1235                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1236                         self::storeByGuid($match[1], $item["owner-link"]);
1237                 }
1238         }
1239
1240         /**
1241          * @brief Fetches an item with a given guid from a given server
1242          *
1243          * @param string $guid   the message guid
1244          * @param string $server The server address
1245          * @param int    $uid    The user id of the user
1246          *
1247          * @return int the message id of the stored message or false
1248          */
1249         private static function storeByGuid($guid, $server, $uid = 0)
1250         {
1251                 $serverparts = parse_url($server);
1252
1253                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1254                         return false;
1255                 }
1256
1257                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1258
1259                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
1260
1261                 $msg = self::message($guid, $server);
1262
1263                 if (!$msg) {
1264                         return false;
1265                 }
1266
1267                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
1268
1269                 // Now call the dispatcher
1270                 return self::dispatchPublic($msg);
1271         }
1272
1273         /**
1274          * @brief Fetches a message from a server
1275          *
1276          * @param string $guid   message guid
1277          * @param string $server The url of the server
1278          * @param int    $level  Endless loop prevention
1279          *
1280          * @return array
1281          *      'message' => The message XML
1282          *      'author' => The author handle
1283          *      'key' => The public key of the author
1284          */
1285         private static function message($guid, $server, $level = 0)
1286         {
1287                 if ($level > 5) {
1288                         return false;
1289                 }
1290
1291                 // This will work for new Diaspora servers and Friendica servers from 3.5
1292                 $source_url = $server."/fetch/post/".urlencode($guid);
1293
1294                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1295
1296                 $envelope = Network::fetchUrl($source_url);
1297                 if ($envelope) {
1298                         logger("Envelope was fetched.", LOGGER_DEBUG);
1299                         $x = self::verifyMagicEnvelope($envelope);
1300                         if (!$x) {
1301                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
1302                         } else {
1303                                 logger("Envelope was verified.", LOGGER_DEBUG);
1304                         }
1305                 } else {
1306                         $x = false;
1307                 }
1308
1309                 // This will work for older Diaspora and Friendica servers
1310                 if (!$x) {
1311                         $source_url = $server."/p/".urlencode($guid).".xml";
1312                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1313
1314                         $x = Network::fetchUrl($source_url);
1315                         if (!$x) {
1316                                 return false;
1317                         }
1318                 }
1319
1320                 $source_xml = XML::parseString($x);
1321
1322                 if (!is_object($source_xml)) {
1323                         return false;
1324                 }
1325
1326                 if ($source_xml->post->reshare) {
1327                         // Reshare of a reshare - old Diaspora version
1328                         logger("Message is a reshare", LOGGER_DEBUG);
1329                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1330                 } elseif ($source_xml->getName() == "reshare") {
1331                         // Reshare of a reshare - new Diaspora version
1332                         logger("Message is a new reshare", LOGGER_DEBUG);
1333                         return self::message($source_xml->root_guid, $server, ++$level);
1334                 }
1335
1336                 $author = "";
1337
1338                 // Fetch the author - for the old and the new Diaspora version
1339                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1340                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1341                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1342                         $author = (string)$source_xml->author;
1343                 }
1344
1345                 // If this isn't a "status_message" then quit
1346                 if (!$author) {
1347                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
1348                         return false;
1349                 }
1350
1351                 $msg = ["message" => $x, "author" => $author];
1352
1353                 $msg["key"] = self::key($msg["author"]);
1354
1355                 return $msg;
1356         }
1357
1358         /**
1359          * @brief Fetches the item record of a given guid
1360          *
1361          * @param int    $uid     The user id
1362          * @param string $guid    message guid
1363          * @param string $author  The handle of the item
1364          * @param array  $contact The contact of the item owner
1365          *
1366          * @return array the item record
1367          */
1368         private static function parentItem($uid, $guid, $author, array $contact)
1369         {
1370                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1371                         'author-name', 'author-link', 'author-avatar',
1372                         'owner-name', 'owner-link', 'owner-avatar'];
1373                 $condition = ['uid' => $uid, 'guid' => $guid];
1374                 $item = Item::selectFirst($fields, $condition);
1375
1376                 if (!DBA::isResult($item)) {
1377                         $person = self::personByHandle($author);
1378                         $result = self::storeByGuid($guid, $person["url"], $uid);
1379
1380                         // We don't have an url for items that arrived at the public dispatcher
1381                         if (!$result && !empty($contact["url"])) {
1382                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1383                         }
1384
1385                         if ($result) {
1386                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
1387
1388                                 $item = Item::selectFirst($fields, $condition);
1389                         }
1390                 }
1391
1392                 if (!DBA::isResult($item)) {
1393                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
1394                         return false;
1395                 } else {
1396                         logger("parent item found: parent: ".$guid." - user: ".$uid);
1397                         return $item;
1398                 }
1399         }
1400
1401         /**
1402          * @brief returns contact details
1403          *
1404          * @param array $def_contact The default contact if the person isn't found
1405          * @param array $person      The record of the person
1406          * @param int   $uid         The user id
1407          *
1408          * @return array
1409          *      'cid' => contact id
1410          *      'network' => network type
1411          */
1412         private static function authorContactByUrl($def_contact, $person, $uid)
1413         {
1414                 $condition = ['nurl' => normalise_link($person["url"]), 'uid' => $uid];
1415                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1416                 if (DBA::isResult($contact)) {
1417                         $cid = $contact["id"];
1418                         $network = $contact["network"];
1419                 } else {
1420                         $cid = $def_contact["id"];
1421                         $network = NETWORK_DIASPORA;
1422                 }
1423
1424                 return ["cid" => $cid, "network" => $network];
1425         }
1426
1427         /**
1428          * @brief Is the profile a hubzilla profile?
1429          *
1430          * @param string $url The profile link
1431          *
1432          * @return bool is it a hubzilla server?
1433          */
1434         public static function isRedmatrix($url)
1435         {
1436                 return(strstr($url, "/channel/"));
1437         }
1438
1439         /**
1440          * @brief Generate a post link with a given handle and message guid
1441          *
1442          * @param string $addr        The user handle
1443          * @param string $guid        message guid
1444          * @param string $parent_guid optional parent guid
1445          *
1446          * @return string the post link
1447          */
1448         private static function plink($addr, $guid, $parent_guid = '')
1449         {
1450                 $contact = Contact::getDetailsByAddr($addr);
1451
1452                 // Fallback
1453                 if (!$contact) {
1454                         if ($parent_guid != '') {
1455                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1456                         } else {
1457                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1458                         }
1459                 }
1460
1461                 if ($contact["network"] == NETWORK_DFRN) {
1462                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1463                 }
1464
1465                 if (self::isRedmatrix($contact["url"])) {
1466                         return $contact["url"] . "/?f=&mid=" . $guid;
1467                 }
1468
1469                 if ($parent_guid != '') {
1470                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1471                 } else {
1472                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1473                 }
1474         }
1475
1476         /**
1477          * @brief Receives account migration
1478          *
1479          * @param array  $importer Array of the importer user
1480          * @param object $data     The message object
1481          *
1482          * @return bool Success
1483          */
1484         private static function receiveAccountMigration(array $importer, $data)
1485         {
1486                 $old_handle = notags(unxmlify($data->author));
1487                 $new_handle = notags(unxmlify($data->profile->author));
1488                 $signature = notags(unxmlify($data->signature));
1489
1490                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1491                 if (!$contact) {
1492                         logger("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1493                         return false;
1494                 }
1495
1496                 logger("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1497
1498                 // Check signature
1499                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1500                 $key = self::key($old_handle);
1501                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1502                         logger('No valid signature for migration.');
1503                         return false;
1504                 }
1505
1506                 // Update the profile
1507                 self::receiveProfile($importer, $data->profile);
1508
1509                 // change the technical stuff in contact and gcontact
1510                 $data = Probe::uri($new_handle);
1511                 if ($data['network'] == NETWORK_PHANTOM) {
1512                         logger('Account for '.$new_handle." couldn't be probed.");
1513                         return false;
1514                 }
1515
1516                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1517                                 'name' => $data['name'], 'nick' => $data['nick'],
1518                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1519                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1520                                 'network' => $data['network']];
1521
1522                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1523
1524                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1525                                 'name' => $data['name'], 'nick' => $data['nick'],
1526                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1527                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1528                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1529
1530                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1531
1532                 logger('Contacts are updated.');
1533
1534                 return true;
1535         }
1536
1537         /**
1538          * @brief Processes an account deletion
1539          *
1540          * @param object $data     The message object
1541          *
1542          * @return bool Success
1543          */
1544         private static function receiveAccountDeletion($data)
1545         {
1546                 $author = notags(unxmlify($data->author));
1547
1548                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1549                 while ($contact = DBA::fetch($contacts)) {
1550                         Contact::remove($contact["id"]);
1551                 }
1552
1553                 DBA::delete('gcontact', ['addr' => $author]);
1554
1555                 logger('Removed contacts for ' . $author);
1556
1557                 return true;
1558         }
1559
1560         /**
1561          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1562          *
1563          * @param string  $author    Author handle
1564          * @param string  $guid      Message guid
1565          * @param boolean $onlyfound Only return uri when found in the database
1566          *
1567          * @return string The constructed uri or the one from our database
1568          */
1569         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1570         {
1571                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1572                 if (DBA::isResult($item)) {
1573                         return $item["uri"];
1574                 } elseif (!$onlyfound) {
1575                         $contact = Contact::getDetailsByAddr($author, 0);
1576                         if (!empty($contact['network'])) {
1577                                 $prefix = 'urn:X-' . $contact['network'] . ':';
1578                         } else {
1579                                 // This fallback should happen most unlikely
1580                                 $prefix = 'urn:X-dspr:';
1581                         }
1582
1583                         $author_parts = explode('@', $author);
1584
1585                         return $prefix . $author_parts[1] . ':' . $author_parts[0] . ':'. $guid;
1586                 }
1587
1588                 return "";
1589         }
1590
1591         /**
1592          * @brief Fetch the guid from our database with a given uri
1593          *
1594          * @param string $uri Message uri
1595          * @param string $uid Author handle
1596          *
1597          * @return string The post guid
1598          */
1599         private static function getGuidFromUri($uri, $uid)
1600         {
1601                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1602                 if (DBA::isResult($item)) {
1603                         return $item["guid"];
1604                 } else {
1605                         return false;
1606                 }
1607         }
1608
1609         /**
1610          * @brief Find the best importer for a comment, like, ...
1611          *
1612          * @param string $guid The guid of the item
1613          *
1614          * @return array|boolean the origin owner of that post - or false
1615          */
1616         private static function importerForGuid($guid)
1617         {
1618                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1619                 if (DBA::isResult($item)) {
1620                         logger("Found user ".$item['uid']." as owner of item ".$guid, LOGGER_DEBUG);
1621                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1622                         if (DBA::isResult($contact)) {
1623                                 return $contact;
1624                         }
1625                 }
1626                 return false;
1627         }
1628
1629         /**
1630          * @brief Processes an incoming comment
1631          *
1632          * @param array  $importer Array of the importer user
1633          * @param string $sender   The sender of the message
1634          * @param object $data     The message object
1635          * @param string $xml      The original XML of the message
1636          *
1637          * @return int The message id of the generated comment or "false" if there was an error
1638          */
1639         private static function receiveComment(array $importer, $sender, $data, $xml)
1640         {
1641                 $author = notags(unxmlify($data->author));
1642                 $guid = notags(unxmlify($data->guid));
1643                 $parent_guid = notags(unxmlify($data->parent_guid));
1644                 $text = unxmlify($data->text);
1645
1646                 if (isset($data->created_at)) {
1647                         $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1648                 } else {
1649                         $created_at = DateTimeFormat::utcNow();
1650                 }
1651
1652                 if (isset($data->thread_parent_guid)) {
1653                         $thread_parent_guid = notags(unxmlify($data->thread_parent_guid));
1654                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1655                 } else {
1656                         $thr_uri = "";
1657                 }
1658
1659                 $contact = self::allowedContactByHandle($importer, $sender, true);
1660                 if (!$contact) {
1661                         return false;
1662                 }
1663
1664                 $message_id = self::messageExists($importer["uid"], $guid);
1665                 if ($message_id) {
1666                         return true;
1667                 }
1668
1669                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1670                 if (!$parent_item) {
1671                         return false;
1672                 }
1673
1674                 $person = self::personByHandle($author);
1675                 if (!is_array($person)) {
1676                         logger("unable to find author details");
1677                         return false;
1678                 }
1679
1680                 // Fetch the contact id - if we know this contact
1681                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1682
1683                 $datarray = [];
1684
1685                 $datarray["uid"] = $importer["uid"];
1686                 $datarray["contact-id"] = $author_contact["cid"];
1687                 $datarray["network"]  = $author_contact["network"];
1688
1689                 $datarray["author-link"] = $person["url"];
1690                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1691
1692                 $datarray["owner-link"] = $contact["url"];
1693                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1694
1695                 $datarray["guid"] = $guid;
1696                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1697
1698                 $datarray["verb"] = ACTIVITY_POST;
1699                 $datarray["gravity"] = GRAVITY_COMMENT;
1700
1701                 if ($thr_uri != "") {
1702                         $datarray["parent-uri"] = $thr_uri;
1703                 } else {
1704                         $datarray["parent-uri"] = $parent_item["uri"];
1705                 }
1706
1707                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1708
1709                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1710                 $datarray["source"] = $xml;
1711
1712                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1713
1714                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1715
1716                 $body = Markdown::toBBCode($text);
1717
1718                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1719
1720                 self::fetchGuid($datarray);
1721
1722                 // If we are the origin of the parent we store the original data.
1723                 // We notify our followers during the item storage.
1724                 if ($parent_item["origin"]) {
1725                         $datarray['diaspora_signed_text'] = json_encode($data);
1726                 }
1727
1728                 $message_id = Item::insert($datarray);
1729
1730                 if ($message_id <= 0) {
1731                         return false;
1732                 }
1733
1734                 if ($message_id) {
1735                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1736                         if ($datarray['uid'] == 0) {
1737                                 Item::distribute($message_id, json_encode($data));
1738                         }
1739                 }
1740
1741                 return true;
1742         }
1743
1744         /**
1745          * @brief processes and stores private messages
1746          *
1747          * @param array  $importer     Array of the importer user
1748          * @param array  $contact      The contact of the message
1749          * @param object $data         The message object
1750          * @param array  $msg          Array of the processed message, author handle and key
1751          * @param object $mesg         The private message
1752          * @param array  $conversation The conversation record to which this message belongs
1753          *
1754          * @return bool "true" if it was successful
1755          */
1756         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1757         {
1758                 $author = notags(unxmlify($data->author));
1759                 $guid = notags(unxmlify($data->guid));
1760                 $subject = notags(unxmlify($data->subject));
1761
1762                 // "diaspora_handle" is the element name from the old version
1763                 // "author" is the element name from the new version
1764                 if ($mesg->author) {
1765                         $msg_author = notags(unxmlify($mesg->author));
1766                 } elseif ($mesg->diaspora_handle) {
1767                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1768                 } else {
1769                         return false;
1770                 }
1771
1772                 $msg_guid = notags(unxmlify($mesg->guid));
1773                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1774                 $msg_text = unxmlify($mesg->text);
1775                 $msg_created_at = DateTimeFormat::utc(notags(unxmlify($mesg->created_at)));
1776
1777                 if ($msg_conversation_guid != $guid) {
1778                         logger("message conversation guid does not belong to the current conversation.");
1779                         return false;
1780                 }
1781
1782                 $body = Markdown::toBBCode($msg_text);
1783                 $message_uri = $msg_author.":".$msg_guid;
1784
1785                 $person = self::personByHandle($msg_author);
1786
1787                 DBA::lock('mail');
1788
1789                 $r = q(
1790                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1791                         DBA::escape($msg_guid),
1792                         intval($importer["uid"])
1793                 );
1794                 if (DBA::isResult($r)) {
1795                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1796                         return false;
1797                 }
1798
1799                 q(
1800                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1801                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1802                         intval($importer["uid"]),
1803                         DBA::escape($msg_guid),
1804                         intval($conversation["id"]),
1805                         DBA::escape($person["name"]),
1806                         DBA::escape($person["photo"]),
1807                         DBA::escape($person["url"]),
1808                         intval($contact["id"]),
1809                         DBA::escape($subject),
1810                         DBA::escape($body),
1811                         0,
1812                         0,
1813                         DBA::escape($message_uri),
1814                         DBA::escape($author.":".$guid),
1815                         DBA::escape($msg_created_at)
1816                 );
1817
1818                 DBA::unlock();
1819
1820                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
1821
1822                 notification(
1823                         [
1824                         "type" => NOTIFY_MAIL,
1825                         "notify_flags" => $importer["notify-flags"],
1826                         "language" => $importer["language"],
1827                         "to_name" => $importer["username"],
1828                         "to_email" => $importer["email"],
1829                         "uid" =>$importer["uid"],
1830                         "item" => ["subject" => $subject, "body" => $body],
1831                         "source_name" => $person["name"],
1832                         "source_link" => $person["url"],
1833                         "source_photo" => $person["thumb"],
1834                         "verb" => ACTIVITY_POST,
1835                         "otype" => "mail"]
1836                 );
1837                 return true;
1838         }
1839
1840         /**
1841          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1842          *
1843          * @param array  $importer Array of the importer user
1844          * @param array  $msg      Array of the processed message, author handle and key
1845          * @param object $data     The message object
1846          *
1847          * @return bool Success
1848          */
1849         private static function receiveConversation(array $importer, $msg, $data)
1850         {
1851                 $author = notags(unxmlify($data->author));
1852                 $guid = notags(unxmlify($data->guid));
1853                 $subject = notags(unxmlify($data->subject));
1854                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1855                 $participants = notags(unxmlify($data->participants));
1856
1857                 $messages = $data->message;
1858
1859                 if (!count($messages)) {
1860                         logger("empty conversation");
1861                         return false;
1862                 }
1863
1864                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1865                 if (!$contact) {
1866                         return false;
1867                 }
1868
1869                 $conversation = null;
1870
1871                 $c = q(
1872                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1873                         intval($importer["uid"]),
1874                         DBA::escape($guid)
1875                 );
1876                 if ($c)
1877                         $conversation = $c[0];
1878                 else {
1879                         $r = q(
1880                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1881                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1882                                 intval($importer["uid"]),
1883                                 DBA::escape($guid),
1884                                 DBA::escape($author),
1885                                 DBA::escape($created_at),
1886                                 DBA::escape(DateTimeFormat::utcNow()),
1887                                 DBA::escape($subject),
1888                                 DBA::escape($participants)
1889                         );
1890                         if ($r) {
1891                                 $c = q(
1892                                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1893                                         intval($importer["uid"]),
1894                                         DBA::escape($guid)
1895                                 );
1896                         }
1897
1898                         if ($c) {
1899                                 $conversation = $c[0];
1900                         }
1901                 }
1902                 if (!$conversation) {
1903                         logger("unable to create conversation.");
1904                         return false;
1905                 }
1906
1907                 foreach ($messages as $mesg) {
1908                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1909                 }
1910
1911                 return true;
1912         }
1913
1914         /**
1915          * @brief Processes "like" messages
1916          *
1917          * @param array  $importer Array of the importer user
1918          * @param string $sender   The sender of the message
1919          * @param object $data     The message object
1920          *
1921          * @return int The message id of the generated like or "false" if there was an error
1922          */
1923         private static function receiveLike(array $importer, $sender, $data)
1924         {
1925                 $author = notags(unxmlify($data->author));
1926                 $guid = notags(unxmlify($data->guid));
1927                 $parent_guid = notags(unxmlify($data->parent_guid));
1928                 $parent_type = notags(unxmlify($data->parent_type));
1929                 $positive = notags(unxmlify($data->positive));
1930
1931                 // likes on comments aren't supported by Diaspora - only on posts
1932                 // But maybe this will be supported in the future, so we will accept it.
1933                 if (!in_array($parent_type, ["Post", "Comment"])) {
1934                         return false;
1935                 }
1936
1937                 $contact = self::allowedContactByHandle($importer, $sender, true);
1938                 if (!$contact) {
1939                         return false;
1940                 }
1941
1942                 $message_id = self::messageExists($importer["uid"], $guid);
1943                 if ($message_id) {
1944                         return true;
1945                 }
1946
1947                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1948                 if (!$parent_item) {
1949                         return false;
1950                 }
1951
1952                 $person = self::personByHandle($author);
1953                 if (!is_array($person)) {
1954                         logger("unable to find author details");
1955                         return false;
1956                 }
1957
1958                 // Fetch the contact id - if we know this contact
1959                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1960
1961                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1962                 // We would accept this anyhow.
1963                 if ($positive == "true") {
1964                         $verb = ACTIVITY_LIKE;
1965                 } else {
1966                         $verb = ACTIVITY_DISLIKE;
1967                 }
1968
1969                 $datarray = [];
1970
1971                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1972
1973                 $datarray["uid"] = $importer["uid"];
1974                 $datarray["contact-id"] = $author_contact["cid"];
1975                 $datarray["network"]  = $author_contact["network"];
1976
1977                 $datarray["author-link"] = $person["url"];
1978                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1979
1980                 $datarray["owner-link"] = $contact["url"];
1981                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1982
1983                 $datarray["guid"] = $guid;
1984                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1985
1986                 $datarray["verb"] = $verb;
1987                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1988                 $datarray["parent-uri"] = $parent_item["uri"];
1989
1990                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1991
1992                 $datarray["body"] = $verb;
1993
1994                 // Diaspora doesn't provide a date for likes
1995                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1996
1997                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
1998                 if ($parent_item["id"] != $parent_item["parent"]) {
1999                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item["parent"]]);
2000                         $origin = $toplevel["origin"];
2001                 } else {
2002                         $origin = $parent_item["origin"];
2003                 }
2004
2005                 // If we are the origin of the parent we store the original data.
2006                 // We notify our followers during the item storage.
2007                 if ($origin) {
2008                         $datarray['diaspora_signed_text'] = json_encode($data);
2009                 }
2010
2011                 $message_id = Item::insert($datarray);
2012
2013                 if ($message_id <= 0) {
2014                         return false;
2015                 }
2016
2017                 if ($message_id) {
2018                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2019                         if ($datarray['uid'] == 0) {
2020                                 Item::distribute($message_id, json_encode($data));
2021                         }
2022                 }
2023
2024                 return true;
2025         }
2026
2027         /**
2028          * @brief Processes private messages
2029          *
2030          * @param array  $importer Array of the importer user
2031          * @param object $data     The message object
2032          *
2033          * @return bool Success?
2034          */
2035         private static function receiveMessage(array $importer, $data)
2036         {
2037                 $author = notags(unxmlify($data->author));
2038                 $guid = notags(unxmlify($data->guid));
2039                 $conversation_guid = notags(unxmlify($data->conversation_guid));
2040                 $text = unxmlify($data->text);
2041                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2042
2043                 $contact = self::allowedContactByHandle($importer, $author, true);
2044                 if (!$contact) {
2045                         return false;
2046                 }
2047
2048                 $conversation = null;
2049
2050                 $c = q(
2051                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
2052                         intval($importer["uid"]),
2053                         DBA::escape($conversation_guid)
2054                 );
2055                 if ($c) {
2056                         $conversation = $c[0];
2057                 } else {
2058                         logger("conversation not available.");
2059                         return false;
2060                 }
2061
2062                 $message_uri = $author.":".$guid;
2063
2064                 $person = self::personByHandle($author);
2065                 if (!$person) {
2066                         logger("unable to find author details");
2067                         return false;
2068                 }
2069
2070                 $body = Markdown::toBBCode($text);
2071
2072                 $body = self::replacePeopleGuid($body, $person["url"]);
2073
2074                 DBA::lock('mail');
2075
2076                 $r = q(
2077                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
2078                         DBA::escape($guid),
2079                         intval($importer["uid"])
2080                 );
2081                 if (DBA::isResult($r)) {
2082                         logger("duplicate message already delivered.", LOGGER_DEBUG);
2083                         return false;
2084                 }
2085
2086                 q(
2087                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
2088                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
2089                         intval($importer["uid"]),
2090                         DBA::escape($guid),
2091                         intval($conversation["id"]),
2092                         DBA::escape($person["name"]),
2093                         DBA::escape($person["photo"]),
2094                         DBA::escape($person["url"]),
2095                         intval($contact["id"]),
2096                         DBA::escape($conversation["subject"]),
2097                         DBA::escape($body),
2098                         0,
2099                         1,
2100                         DBA::escape($message_uri),
2101                         DBA::escape($author.":".$conversation["guid"]),
2102                         DBA::escape($created_at)
2103                 );
2104
2105                 DBA::unlock();
2106
2107                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
2108                 return true;
2109         }
2110
2111         /**
2112          * @brief Processes participations - unsupported by now
2113          *
2114          * @param array  $importer Array of the importer user
2115          * @param object $data     The message object
2116          *
2117          * @return bool always true
2118          */
2119         private static function receiveParticipation(array $importer, $data)
2120         {
2121                 $author = strtolower(notags(unxmlify($data->author)));
2122                 $parent_guid = notags(unxmlify($data->parent_guid));
2123
2124                 $contact_id = Contact::getIdForURL($author);
2125                 if (!$contact_id) {
2126                         logger('Contact not found: '.$author);
2127                         return false;
2128                 }
2129
2130                 $person = self::personByHandle($author);
2131                 if (!is_array($person)) {
2132                         logger("Person not found: ".$author);
2133                         return false;
2134                 }
2135
2136                 $item = Item::selectFirst(['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2137                 if (!DBA::isResult($item)) {
2138                         logger('Item not found, no origin or private: '.$parent_guid);
2139                         return false;
2140                 }
2141
2142                 $author_parts = explode('@', $author);
2143                 if (isset($author_parts[1])) {
2144                         $server = $author_parts[1];
2145                 } else {
2146                         // Should never happen
2147                         $server = $author;
2148                 }
2149
2150                 logger('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, LOGGER_DEBUG);
2151
2152                 if (!DBA::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2153                         DBA::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2154                 }
2155
2156                 // Send all existing comments and likes to the requesting server
2157                 $comments = Item::select(['id', 'parent', 'verb', 'self'], ['parent' => $item['id']]);
2158                 while ($comment = Item::fetch($comments)) {
2159                         if ($comment['id'] == $comment['parent']) {
2160                                 continue;
2161                         }
2162                         if ($comment['verb'] == ACTIVITY_POST) {
2163                                 $cmd = $comment['self'] ? 'comment-new' : 'comment-import';
2164                         } else {
2165                                 $cmd = $comment['self'] ? 'like' : 'comment-import';
2166                         }
2167                         logger("Send ".$cmd." for item ".$comment['id']." to contact ".$contact_id, LOGGER_DEBUG);
2168                         Worker::add(PRIORITY_HIGH, 'Delivery', $cmd, $comment['id'], $contact_id);
2169                 }
2170                 DBA::close($comments);
2171
2172                 return true;
2173         }
2174
2175         /**
2176          * @brief Processes photos - unneeded
2177          *
2178          * @param array  $importer Array of the importer user
2179          * @param object $data     The message object
2180          *
2181          * @return bool always true
2182          */
2183         private static function receivePhoto(array $importer, $data)
2184         {
2185                 // There doesn't seem to be a reason for this function,
2186                 // since the photo data is transmitted in the status message as well
2187                 return true;
2188         }
2189
2190         /**
2191          * @brief Processes poll participations - unssupported
2192          *
2193          * @param array  $importer Array of the importer user
2194          * @param object $data     The message object
2195          *
2196          * @return bool always true
2197          */
2198         private static function receivePollParticipation(array $importer, $data)
2199         {
2200                 // We don't support polls by now
2201                 return true;
2202         }
2203
2204         /**
2205          * @brief Processes incoming profile updates
2206          *
2207          * @param array  $importer Array of the importer user
2208          * @param object $data     The message object
2209          *
2210          * @return bool Success
2211          */
2212         private static function receiveProfile(array $importer, $data)
2213         {
2214                 $author = strtolower(notags(unxmlify($data->author)));
2215
2216                 $contact = self::contactByHandle($importer["uid"], $author);
2217                 if (!$contact) {
2218                         return false;
2219                 }
2220
2221                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
2222                 $image_url = unxmlify($data->image_url);
2223                 $birthday = unxmlify($data->birthday);
2224                 $gender = unxmlify($data->gender);
2225                 $about = Markdown::toBBCode(unxmlify($data->bio));
2226                 $location = Markdown::toBBCode(unxmlify($data->location));
2227                 $searchable = (unxmlify($data->searchable) == "true");
2228                 $nsfw = (unxmlify($data->nsfw) == "true");
2229                 $tags = unxmlify($data->tag_string);
2230
2231                 $tags = explode("#", $tags);
2232
2233                 $keywords = [];
2234                 foreach ($tags as $tag) {
2235                         $tag = trim(strtolower($tag));
2236                         if ($tag != "") {
2237                                 $keywords[] = $tag;
2238                         }
2239                 }
2240
2241                 $keywords = implode(", ", $keywords);
2242
2243                 $handle_parts = explode("@", $author);
2244                 $nick = $handle_parts[0];
2245
2246                 if ($name === "") {
2247                         $name = $handle_parts[0];
2248                 }
2249
2250                 if (preg_match("|^https?://|", $image_url) === 0) {
2251                         $image_url = "http://".$handle_parts[1].$image_url;
2252                 }
2253
2254                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2255
2256                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2257
2258                 $birthday = str_replace("1000", "1901", $birthday);
2259
2260                 if ($birthday != "") {
2261                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2262                 }
2263
2264                 // this is to prevent multiple birthday notifications in a single year
2265                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2266
2267                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2268                         $birthday = $contact["bd"];
2269                 }
2270
2271                 $fields = ['name' => $name, 'location' => $location,
2272                         'name-date' => DateTimeFormat::utcNow(),
2273                         'about' => $about, 'gender' => $gender,
2274                         'addr' => $author, 'nick' => $nick,
2275                         'keywords' => $keywords];
2276
2277                 if (!empty($birthday)) {
2278                         $fields['bd'] = $birthday;
2279                 }
2280
2281                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2282
2283                 $gcontact = ["url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
2284                                         "photo" => $image_url, "name" => $name, "location" => $location,
2285                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2286                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2287                                         "hide" => !$searchable, "nsfw" => $nsfw];
2288
2289                 $gcid = GContact::update($gcontact);
2290
2291                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2292
2293                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
2294
2295                 return true;
2296         }
2297
2298         /**
2299          * @brief Processes incoming friend requests
2300          *
2301          * @param array $importer Array of the importer user
2302          * @param array $contact  The contact that send the request
2303          * @return void
2304          */
2305         private static function receiveRequestMakeFriend(array $importer, array $contact)
2306         {
2307                 $a = get_app();
2308
2309                 if ($contact["rel"] == Contact::SHARING) {
2310                         DBA::update(
2311                                 'contact',
2312                                 ['rel' => Contact::FRIEND, 'writable' => true],
2313                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2314                         );
2315                 }
2316         }
2317
2318         /**
2319          * @brief Processes incoming sharing notification
2320          *
2321          * @param array  $importer Array of the importer user
2322          * @param object $data     The message object
2323          *
2324          * @return bool Success
2325          */
2326         private static function receiveContactRequest(array $importer, $data)
2327         {
2328                 $author = unxmlify($data->author);
2329                 $recipient = unxmlify($data->recipient);
2330
2331                 if (!$author || !$recipient) {
2332                         return false;
2333                 }
2334
2335                 // the current protocol version doesn't know these fields
2336                 // That means that we will assume their existance
2337                 if (isset($data->following)) {
2338                         $following = (unxmlify($data->following) == "true");
2339                 } else {
2340                         $following = true;
2341                 }
2342
2343                 if (isset($data->sharing)) {
2344                         $sharing = (unxmlify($data->sharing) == "true");
2345                 } else {
2346                         $sharing = true;
2347                 }
2348
2349                 $contact = self::contactByHandle($importer["uid"], $author);
2350
2351                 // perhaps we were already sharing with this person. Now they're sharing with us.
2352                 // That makes us friends.
2353                 if ($contact) {
2354                         if ($following) {
2355                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", LOGGER_DEBUG);
2356                                 self::receiveRequestMakeFriend($importer, $contact);
2357
2358                                 // refetch the contact array
2359                                 $contact = self::contactByHandle($importer["uid"], $author);
2360
2361                                 // If we are now friends, we are sending a share message.
2362                                 // Normally we needn't to do so, but the first message could have been vanished.
2363                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2364                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2365                                         if ($u) {
2366                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2367                                                 $ret = self::sendShare($u[0], $contact);
2368                                         }
2369                                 }
2370                                 return true;
2371                         } else {
2372                                 logger("Author ".$author." doesn't want to follow us anymore.", LOGGER_DEBUG);
2373                                 Contact::removeFollower($importer, $contact);
2374                                 return true;
2375                         }
2376                 }
2377
2378                 if (!$following && $sharing && in_array($importer["page-flags"], [Contact::PAGE_SOAPBOX, Contact::PAGE_NORMAL])) {
2379                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2380                         return false;
2381                 } elseif (!$following && !$sharing) {
2382                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2383                         return false;
2384                 } elseif (!$following && $sharing) {
2385                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2386                 } elseif ($following && $sharing) {
2387                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2388                 } elseif ($following && !$sharing) {
2389                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2390                 }
2391
2392                 $ret = self::personByHandle($author);
2393
2394                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2395                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2396                         return false;
2397                 }
2398
2399                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2400
2401                 $r = q(
2402                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2403                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2404                         intval($importer["uid"]),
2405                         DBA::escape($ret["network"]),
2406                         DBA::escape($ret["addr"]),
2407                         DateTimeFormat::utcNow(),
2408                         DBA::escape($ret["url"]),
2409                         DBA::escape(normalise_link($ret["url"])),
2410                         DBA::escape($batch),
2411                         DBA::escape($ret["name"]),
2412                         DBA::escape($ret["nick"]),
2413                         DBA::escape($ret["photo"]),
2414                         DBA::escape($ret["pubkey"]),
2415                         DBA::escape($ret["notify"]),
2416                         DBA::escape($ret["poll"]),
2417                         1,
2418                         2
2419                 );
2420
2421                 // find the contact record we just created
2422
2423                 $contact_record = self::contactByHandle($importer["uid"], $author);
2424
2425                 if (!$contact_record) {
2426                         logger("unable to locate newly created contact record.");
2427                         return;
2428                 }
2429
2430                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2431
2432                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2433
2434                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2435
2436                 if (in_array($importer["page-flags"], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP])) {
2437                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2438
2439                         $hash = random_string().(string)time();   // Generate a confirm_key
2440
2441                         $ret = q(
2442                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2443                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2444                                 intval($importer["uid"]),
2445                                 intval($contact_record["id"]),
2446                                 0,
2447                                 0,
2448                                 DBA::escape(L10n::t("Sharing notification from Diaspora network")),
2449                                 DBA::escape($hash),
2450                                 DBA::escape(DateTimeFormat::utcNow())
2451                         );
2452                 } else {
2453                         // automatic friend approval
2454
2455                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2456
2457                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2458
2459                         // technically they are sharing with us (Contact::SHARING),
2460                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2461                         // we are going to change the relationship and make them a follower.
2462
2463                         if (($importer["page-flags"] == Contact::PAGE_FREELOVE) && $sharing && $following) {
2464                                 $new_relation = Contact::FRIEND;
2465                         } elseif (($importer["page-flags"] == Contact::PAGE_FREELOVE) && $sharing) {
2466                                 $new_relation = Contact::SHARING;
2467                         } else {
2468                                 $new_relation = Contact::FOLLOWER;
2469                         }
2470
2471                         $r = q(
2472                                 "UPDATE `contact` SET `rel` = %d,
2473                                 `name-date` = '%s',
2474                                 `uri-date` = '%s',
2475                                 `blocked` = 0,
2476                                 `pending` = 0,
2477                                 `writable` = 1
2478                                 WHERE `id` = %d
2479                                 ",
2480                                 intval($new_relation),
2481                                 DBA::escape(DateTimeFormat::utcNow()),
2482                                 DBA::escape(DateTimeFormat::utcNow()),
2483                                 intval($contact_record["id"])
2484                         );
2485
2486                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2487                         if ($u) {
2488                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2489                                 $ret = self::sendShare($u[0], $contact_record);
2490
2491                                 // Send the profile data, maybe it weren't transmitted before
2492                                 self::sendProfile($importer["uid"], [$contact_record]);
2493                         }
2494                 }
2495
2496                 return true;
2497         }
2498
2499         /**
2500          * @brief Fetches a message with a given guid
2501          *
2502          * @param string $guid        message guid
2503          * @param string $orig_author handle of the original post
2504          * @param string $author      handle of the sharer
2505          *
2506          * @return array The fetched item
2507          */
2508         public static function originalItem($guid, $orig_author)
2509         {
2510                 if (empty($guid)) {
2511                         logger('Empty guid. Quitting.');
2512                         return false;
2513                 }
2514
2515                 // Do we already have this item?
2516                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2517                         'author-name', 'author-link', 'author-avatar'];
2518                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2519                 $item = Item::selectFirst($fields, $condition);
2520
2521                 if (DBA::isResult($item)) {
2522                         logger("reshared message ".$guid." already exists on system.");
2523
2524                         // Maybe it is already a reshared item?
2525                         // Then refetch the content, if it is a reshare from a reshare.
2526                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2527                         if (self::isReshare($item["body"], true)) {
2528                                 $item = [];
2529                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2530                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2531
2532                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2533
2534                                 // Add OEmbed and other information to the body
2535                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2536
2537                                 return $item;
2538                         } else {
2539                                 return $item;
2540                         }
2541                 }
2542
2543                 if (!DBA::isResult($item)) {
2544                         if (empty($orig_author)) {
2545                                 logger('Empty author for guid ' . $guid . '. Quitting.');
2546                                 return false;
2547                         }
2548
2549                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2550                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2551                         $stored = self::storeByGuid($guid, $server);
2552
2553                         if (!$stored) {
2554                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2555                                 logger("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2556                                 $stored = self::storeByGuid($guid, $server);
2557                         }
2558
2559                         if ($stored) {
2560                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2561                                         'author-name', 'author-link', 'author-avatar'];
2562                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2563                                 $item = Item::selectFirst($fields, $condition);
2564
2565                                 if (DBA::isResult($item)) {
2566                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2567                                         if (self::isReshare($item["body"], false)) {
2568                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2569                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2570                                         }
2571
2572                                         return $item;
2573                                 }
2574                         }
2575                 }
2576                 return false;
2577         }
2578
2579         /**
2580          * @brief Processes a reshare message
2581          *
2582          * @param array  $importer Array of the importer user
2583          * @param object $data     The message object
2584          * @param string $xml      The original XML of the message
2585          *
2586          * @return int the message id
2587          */
2588         private static function receiveReshare(array $importer, $data, $xml)
2589         {
2590                 $author = notags(unxmlify($data->author));
2591                 $guid = notags(unxmlify($data->guid));
2592                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2593                 $root_author = notags(unxmlify($data->root_author));
2594                 $root_guid = notags(unxmlify($data->root_guid));
2595                 /// @todo handle unprocessed property "provider_display_name"
2596                 $public = notags(unxmlify($data->public));
2597
2598                 $contact = self::allowedContactByHandle($importer, $author, false);
2599                 if (!$contact) {
2600                         return false;
2601                 }
2602
2603                 $message_id = self::messageExists($importer["uid"], $guid);
2604                 if ($message_id) {
2605                         return true;
2606                 }
2607
2608                 $original_item = self::originalItem($root_guid, $root_author);
2609                 if (!$original_item) {
2610                         return false;
2611                 }
2612
2613                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2614
2615                 $datarray = [];
2616
2617                 $datarray["uid"] = $importer["uid"];
2618                 $datarray["contact-id"] = $contact["id"];
2619                 $datarray["network"]  = NETWORK_DIASPORA;
2620
2621                 $datarray["author-link"] = $contact["url"];
2622                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2623
2624                 $datarray["owner-link"] = $datarray["author-link"];
2625                 $datarray["owner-id"] = $datarray["author-id"];
2626
2627                 $datarray["guid"] = $guid;
2628                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2629
2630                 $datarray["verb"] = ACTIVITY_POST;
2631                 $datarray["gravity"] = GRAVITY_PARENT;
2632
2633                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2634                 $datarray["source"] = $xml;
2635
2636                 $prefix = share_header(
2637                         $original_item["author-name"],
2638                         $original_item["author-link"],
2639                         $original_item["author-avatar"],
2640                         $original_item["guid"],
2641                         $original_item["created"],
2642                         $orig_url
2643                 );
2644                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2645
2646                 $datarray["tag"] = $original_item["tag"];
2647                 $datarray["app"]  = $original_item["app"];
2648
2649                 $datarray["plink"] = self::plink($author, $guid);
2650                 $datarray["private"] = (($public == "false") ? 1 : 0);
2651                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2652
2653                 $datarray["object-type"] = $original_item["object-type"];
2654
2655                 self::fetchGuid($datarray);
2656                 $message_id = Item::insert($datarray);
2657
2658                 self::sendParticipation($contact, $datarray);
2659
2660                 if ($message_id) {
2661                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2662                         if ($datarray['uid'] == 0) {
2663                                 Item::distribute($message_id);
2664                         }
2665                         return true;
2666                 } else {
2667                         return false;
2668                 }
2669         }
2670
2671         /**
2672          * @brief Processes retractions
2673          *
2674          * @param array  $importer Array of the importer user
2675          * @param array  $contact  The contact of the item owner
2676          * @param object $data     The message object
2677          *
2678          * @return bool success
2679          */
2680         private static function itemRetraction(array $importer, array $contact, $data)
2681         {
2682                 $author = notags(unxmlify($data->author));
2683                 $target_guid = notags(unxmlify($data->target_guid));
2684                 $target_type = notags(unxmlify($data->target_type));
2685
2686                 $person = self::personByHandle($author);
2687                 if (!is_array($person)) {
2688                         logger("unable to find author detail for ".$author);
2689                         return false;
2690                 }
2691
2692                 if (empty($contact["url"])) {
2693                         $contact["url"] = $person["url"];
2694                 }
2695
2696                 // Fetch items that are about to be deleted
2697                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2698
2699                 // When we receive a public retraction, we delete every item that we find.
2700                 if ($importer['uid'] == 0) {
2701                         $condition = ['guid' => $target_guid, 'deleted' => false];
2702                 } else {
2703                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2704                 }
2705
2706                 $r = Item::select($fields, $condition);
2707                 if (!DBA::isResult($r)) {
2708                         logger("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2709                         return false;
2710                 }
2711
2712                 while ($item = Item::fetch($r)) {
2713                         if (strstr($item['file'], '[')) {
2714                                 logger("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", LOGGER_DEBUG);
2715                                 continue;
2716                         }
2717
2718                         // Fetch the parent item
2719                         $parent = Item::selectFirst(['author-link'], ['id' => $item["parent"]]);
2720
2721                         // Only delete it if the parent author really fits
2722                         if (!link_compare($parent["author-link"], $contact["url"]) && !link_compare($item["author-link"], $contact["url"])) {
2723                                 logger("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2724                                 continue;
2725                         }
2726
2727                         Item::delete(['id' => $item['id']]);
2728
2729                         logger("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], LOGGER_DEBUG);
2730                 }
2731
2732                 return true;
2733         }
2734
2735         /**
2736          * @brief Receives retraction messages
2737          *
2738          * @param array  $importer Array of the importer user
2739          * @param string $sender   The sender of the message
2740          * @param object $data     The message object
2741          *
2742          * @return bool Success
2743          */
2744         private static function receiveRetraction(array $importer, $sender, $data)
2745         {
2746                 $target_type = notags(unxmlify($data->target_type));
2747
2748                 $contact = self::contactByHandle($importer["uid"], $sender);
2749                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2750                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2751                         return false;
2752                 }
2753
2754                 if (!$contact) {
2755                         $contact = [];
2756                 }
2757
2758                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2759
2760                 switch ($target_type) {
2761                         case "Comment":
2762                         case "Like":
2763                         case "Post":
2764                         case "Reshare":
2765                         case "StatusMessage":
2766                                 return self::itemRetraction($importer, $contact, $data);
2767
2768                         case "PollParticipation":
2769                         case "Photo":
2770                                 // Currently unsupported
2771                                 break;
2772
2773                         default:
2774                                 logger("Unknown target type ".$target_type);
2775                                 return false;
2776                 }
2777                 return true;
2778         }
2779
2780         /**
2781          * @brief Receives status messages
2782          *
2783          * @param array  $importer Array of the importer user
2784          * @param object $data     The message object
2785          * @param string $xml      The original XML of the message
2786          *
2787          * @return int The message id of the newly created item
2788          */
2789         private static function receiveStatusMessage(array $importer, $data, $xml)
2790         {
2791                 $author = notags(unxmlify($data->author));
2792                 $guid = notags(unxmlify($data->guid));
2793                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2794                 $public = notags(unxmlify($data->public));
2795                 $text = unxmlify($data->text);
2796                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2797
2798                 $contact = self::allowedContactByHandle($importer, $author, false);
2799                 if (!$contact) {
2800                         return false;
2801                 }
2802
2803                 $message_id = self::messageExists($importer["uid"], $guid);
2804                 if ($message_id) {
2805                         return true;
2806                 }
2807
2808                 $address = [];
2809                 if ($data->location) {
2810                         foreach ($data->location->children() as $fieldname => $data) {
2811                                 $address[$fieldname] = notags(unxmlify($data));
2812                         }
2813                 }
2814
2815                 $body = Markdown::toBBCode($text);
2816
2817                 $datarray = [];
2818
2819                 // Attach embedded pictures to the body
2820                 if ($data->photo) {
2821                         foreach ($data->photo as $photo) {
2822                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2823                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2824                         }
2825
2826                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2827                 } else {
2828                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2829
2830                         // Add OEmbed and other information to the body
2831                         if (!self::isRedmatrix($contact["url"])) {
2832                                 $body = add_page_info_to_body($body, false, true);
2833                         }
2834                 }
2835
2836                 /// @todo enable support for polls
2837                 //if ($data->poll) {
2838                 //      foreach ($data->poll AS $poll)
2839                 //              print_r($poll);
2840                 //      die("poll!\n");
2841                 //}
2842
2843                 /// @todo enable support for events
2844
2845                 $datarray["uid"] = $importer["uid"];
2846                 $datarray["contact-id"] = $contact["id"];
2847                 $datarray["network"] = NETWORK_DIASPORA;
2848
2849                 $datarray["author-link"] = $contact["url"];
2850                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2851
2852                 $datarray["owner-link"] = $datarray["author-link"];
2853                 $datarray["owner-id"] = $datarray["author-id"];
2854
2855                 $datarray["guid"] = $guid;
2856                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2857
2858                 $datarray["verb"] = ACTIVITY_POST;
2859                 $datarray["gravity"] = GRAVITY_PARENT;
2860
2861                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2862                 $datarray["source"] = $xml;
2863
2864                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2865
2866                 if ($provider_display_name != "") {
2867                         $datarray["app"] = $provider_display_name;
2868                 }
2869
2870                 $datarray["plink"] = self::plink($author, $guid);
2871                 $datarray["private"] = (($public == "false") ? 1 : 0);
2872                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2873
2874                 if (isset($address["address"])) {
2875                         $datarray["location"] = $address["address"];
2876                 }
2877
2878                 if (isset($address["lat"]) && isset($address["lng"])) {
2879                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2880                 }
2881
2882                 self::fetchGuid($datarray);
2883                 $message_id = Item::insert($datarray);
2884
2885                 self::sendParticipation($contact, $datarray);
2886
2887                 if ($message_id) {
2888                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2889                         if ($datarray['uid'] == 0) {
2890                                 Item::distribute($message_id);
2891                         }
2892                         return true;
2893                 } else {
2894                         return false;
2895                 }
2896         }
2897
2898         /* ************************************************************************************** *
2899          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2900          * ************************************************************************************** */
2901
2902         /**
2903          * @brief returnes the handle of a contact
2904          *
2905          * @param array $contact contact array
2906          *
2907          * @return string the handle in the format user@domain.tld
2908          */
2909         private static function myHandle(array $contact)
2910         {
2911                 if (!empty($contact["addr"])) {
2912                         return $contact["addr"];
2913                 }
2914
2915                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2916                 // So - just in case - we build the the address here.
2917                 if ($contact["nickname"] != "") {
2918                         $nick = $contact["nickname"];
2919                 } else {
2920                         $nick = $contact["nick"];
2921                 }
2922
2923                 return $nick . "@" . substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
2924         }
2925
2926
2927         /**
2928          * @brief Creates the data for a private message in the new format
2929          *
2930          * @param string $msg     The message that is to be transmitted
2931          * @param array  $user    The record of the sender
2932          * @param array  $contact Target of the communication
2933          * @param string $prvkey  The private key of the sender
2934          * @param string $pubkey  The public key of the receiver
2935          *
2936          * @return string The encrypted data
2937          */
2938         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2939         {
2940                 logger("Message: ".$msg, LOGGER_DATA);
2941
2942                 // without a public key nothing will work
2943                 if (!$pubkey) {
2944                         logger("pubkey missing: contact id: ".$contact["id"]);
2945                         return false;
2946                 }
2947
2948                 $aes_key = openssl_random_pseudo_bytes(32);
2949                 $b_aes_key = base64_encode($aes_key);
2950                 $iv = openssl_random_pseudo_bytes(16);
2951                 $b_iv = base64_encode($iv);
2952
2953                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
2954
2955                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
2956
2957                 $encrypted_key_bundle = "";
2958                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
2959
2960                 $json_object = json_encode(
2961                         ["aes_key" => base64_encode($encrypted_key_bundle),
2962                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
2963                 );
2964
2965                 return $json_object;
2966         }
2967
2968         /**
2969          * @brief Creates the envelope for the "fetch" endpoint and for the new format
2970          *
2971          * @param string $msg  The message that is to be transmitted
2972          * @param array  $user The record of the sender
2973          *
2974          * @return string The envelope
2975          */
2976         public static function buildMagicEnvelope($msg, array $user)
2977         {
2978                 $b64url_data = base64url_encode($msg);
2979                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
2980
2981                 $key_id = base64url_encode(self::myHandle($user));
2982                 $type = "application/xml";
2983                 $encoding = "base64url";
2984                 $alg = "RSA-SHA256";
2985                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2986
2987                 // Fallback if the private key wasn't transmitted in the expected field
2988                 if ($user['uprvkey'] == "") {
2989                         $user['uprvkey'] = $user['prvkey'];
2990                 }
2991
2992                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
2993                 $sig = base64url_encode($signature);
2994
2995                 $xmldata = ["me:env" => ["me:data" => $data,
2996                                                         "@attributes" => ["type" => $type],
2997                                                         "me:encoding" => $encoding,
2998                                                         "me:alg" => $alg,
2999                                                         "me:sig" => $sig,
3000                                                         "@attributes2" => ["key_id" => $key_id]]];
3001
3002                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3003
3004                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3005         }
3006
3007         /**
3008          * @brief Create the envelope for a message
3009          *
3010          * @param string $msg     The message that is to be transmitted
3011          * @param array  $user    The record of the sender
3012          * @param array  $contact Target of the communication
3013          * @param string $prvkey  The private key of the sender
3014          * @param string $pubkey  The public key of the receiver
3015          * @param bool   $public  Is the message public?
3016          *
3017          * @return string The message that will be transmitted to other servers
3018          */
3019         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3020         {
3021                 // The message is put into an envelope with the sender's signature
3022                 $envelope = self::buildMagicEnvelope($msg, $user);
3023
3024                 // Private messages are put into a second envelope, encrypted with the receivers public key
3025                 if (!$public) {
3026                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3027                 }
3028
3029                 return $envelope;
3030         }
3031
3032         /**
3033          * @brief Creates a signature for a message
3034          *
3035          * @param array $owner   the array of the owner of the message
3036          * @param array $message The message that is to be signed
3037          *
3038          * @return string The signature
3039          */
3040         private static function signature($owner, $message)
3041         {
3042                 $sigmsg = $message;
3043                 unset($sigmsg["author_signature"]);
3044                 unset($sigmsg["parent_author_signature"]);
3045
3046                 $signed_text = implode(";", $sigmsg);
3047
3048                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3049         }
3050
3051         /**
3052          * @brief Transmit a message to a target server
3053          *
3054          * @param array  $owner        the array of the item owner
3055          * @param array  $contact      Target of the communication
3056          * @param string $envelope     The message that is to be transmitted
3057          * @param bool   $public_batch Is it a public post?
3058          * @param bool   $queue_run    Is the transmission called from the queue?
3059          * @param string $guid         message guid
3060          *
3061          * @return int Result of the transmission
3062          */
3063         public static function transmit(array $owner, array $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
3064         {
3065                 $a = get_app();
3066
3067                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3068                 if (!$enabled) {
3069                         return 200;
3070                 }
3071
3072                 $logid = random_string(4);
3073
3074                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3075
3076                 // We always try to use the data from the fcontact table.
3077                 // This is important for transmitting data to Friendica servers.
3078                 if (!empty($contact['addr'])) {
3079                         $fcontact = self::personByHandle($contact['addr']);
3080                         if (!empty($fcontact)) {
3081                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3082                         }
3083                 }
3084
3085                 if (!$dest_url) {
3086                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3087                         return 0;
3088                 }
3089
3090                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
3091
3092                 if (!$queue_run && Queue::wasDelayed($contact["id"])) {
3093                         $return_code = 0;
3094                 } else {
3095                         if (!intval(Config::get("system", "diaspora_test"))) {
3096                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3097
3098                                 Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3099                                 $return_code = $a->get_curl_code();
3100                         } else {
3101                                 logger("test_mode");
3102                                 return 200;
3103                         }
3104                 }
3105
3106                 logger("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3107
3108                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
3109                         if (!$no_queue && ($contact['contact-type'] != Contact::ACCOUNT_TYPE_RELAY)) {
3110                                 logger("queue message");
3111                                 // queue message for redelivery
3112                                 Queue::add($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3113                         }
3114
3115                         // The message could not be delivered. We mark the contact as "dead"
3116                         Contact::markForArchival($contact);
3117                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3118                         // We successfully delivered a message, the contact is alive
3119                         Contact::unmarkForArchival($contact);
3120                 }
3121
3122                 return $return_code ? $return_code : -1;
3123         }
3124
3125
3126         /**
3127          * @brief Build the post xml
3128          *
3129          * @param string $type    The message type
3130          * @param array  $message The message data
3131          *
3132          * @return string The post XML
3133          */
3134         public static function buildPostXml($type, $message)
3135         {
3136                 $data = [$type => $message];
3137
3138                 return XML::fromArray($data, $xml);
3139         }
3140
3141         /**
3142          * @brief Builds and transmit messages
3143          *
3144          * @param array  $owner        the array of the item owner
3145          * @param array  $contact      Target of the communication
3146          * @param string $type         The message type
3147          * @param array  $message      The message data
3148          * @param bool   $public_batch Is it a public post?
3149          * @param string $guid         message guid
3150          * @param bool   $spool        Should the transmission be spooled or transmitted?
3151          *
3152          * @return int Result of the transmission
3153          */
3154         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3155         {
3156                 $msg = self::buildPostXml($type, $message);
3157
3158                 logger('message: '.$msg, LOGGER_DATA);
3159                 logger('send guid '.$guid, LOGGER_DEBUG);
3160
3161                 // Fallback if the private key wasn't transmitted in the expected field
3162                 if (empty($owner['uprvkey'])) {
3163                         $owner['uprvkey'] = $owner['prvkey'];
3164                 }
3165
3166                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3167
3168                 if ($spool) {
3169                         Queue::add($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3170                         return true;
3171                 } else {
3172                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3173                 }
3174
3175                 logger("guid: ".$guid." result ".$return_code, LOGGER_DEBUG);
3176
3177                 return $return_code;
3178         }
3179
3180         /**
3181          * @brief sends a participation (Used to get all further updates)
3182          *
3183          * @param array $contact Target of the communication
3184          * @param array $item    Item array
3185          *
3186          * @return int The result of the transmission
3187          */
3188         private static function sendParticipation(array $contact, array $item)
3189         {
3190                 // Don't send notifications for private postings
3191                 if ($item['private']) {
3192                         return;
3193                 }
3194
3195                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3196
3197                 $result = Cache::get($cachekey);
3198                 if (!is_null($result)) {
3199                         return;
3200                 }
3201
3202                 // Fetch some user id to have a valid handle to transmit the participation.
3203                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3204                 // If the item belongs to a user, we take this user id.
3205                 if ($item['uid'] == 0) {
3206                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3207                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3208                         $owner = User::getOwnerDataById($first_user['uid']);
3209                 } else {
3210                         $owner = User::getOwnerDataById($item['uid']);
3211                 }
3212
3213                 $author = self::myHandle($owner);
3214
3215                 $message = ["author" => $author,
3216                                 "guid" => System::createGUID(32),
3217                                 "parent_type" => "Post",
3218                                 "parent_guid" => $item["guid"]];
3219
3220                 logger("Send participation for ".$item["guid"]." by ".$author, LOGGER_DEBUG);
3221
3222                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3223                 Cache::set($cachekey, $item["guid"], CACHE_QUARTER_HOUR);
3224
3225                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3226         }
3227
3228         /**
3229          * @brief sends an account migration
3230          *
3231          * @param array $owner   the array of the item owner
3232          * @param array $contact Target of the communication
3233          * @param int   $uid     User ID
3234          *
3235          * @return int The result of the transmission
3236          */
3237         public static function sendAccountMigration(array $owner, array $contact, $uid)
3238         {
3239                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3240                 $profile = self::createProfileData($uid);
3241
3242                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3243                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3244
3245                 $message = ["author" => $old_handle,
3246                                 "profile" => $profile,
3247                                 "signature" => $signature];
3248
3249                 logger("Send account migration ".print_r($message, true), LOGGER_DEBUG);
3250
3251                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3252         }
3253
3254         /**
3255          * @brief Sends a "share" message
3256          *
3257          * @param array $owner   the array of the item owner
3258          * @param array $contact Target of the communication
3259          *
3260          * @return int The result of the transmission
3261          */
3262         public static function sendShare(array $owner, array $contact)
3263         {
3264                 /**
3265                  * @todo support the different possible combinations of "following" and "sharing"
3266                  * Currently, Diaspora only interprets the "sharing" field
3267                  *
3268                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3269                  */
3270
3271                 /*
3272                 switch ($contact["rel"]) {
3273                         case Contact::FRIEND:
3274                                 $following = true;
3275                                 $sharing = true;
3276
3277                         case Contact::SHARING:
3278                                 $following = false;
3279                                 $sharing = true;
3280
3281                         case Contact::FOLLOWER:
3282                                 $following = true;
3283                                 $sharing = false;
3284                 }
3285                 */
3286
3287                 $message = ["author" => self::myHandle($owner),
3288                                 "recipient" => $contact["addr"],
3289                                 "following" => "true",
3290                                 "sharing" => "true"];
3291
3292                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
3293
3294                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3295         }
3296
3297         /**
3298          * @brief sends an "unshare"
3299          *
3300          * @param array $owner   the array of the item owner
3301          * @param array $contact Target of the communication
3302          *
3303          * @return int The result of the transmission
3304          */
3305         public static function sendUnshare(array $owner, array $contact)
3306         {
3307                 $message = ["author" => self::myHandle($owner),
3308                                 "recipient" => $contact["addr"],
3309                                 "following" => "false",
3310                                 "sharing" => "false"];
3311
3312                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
3313
3314                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3315         }
3316
3317         /**
3318          * @brief Checks a message body if it is a reshare
3319          *
3320          * @param string $body     The message body that is to be check
3321          * @param bool   $complete Should it be a complete check or a simple check?
3322          *
3323          * @return array|bool Reshare details or "false" if no reshare
3324          */
3325         public static function isReshare($body, $complete = true)
3326         {
3327                 $body = trim($body);
3328
3329                 // Skip if it isn't a pure repeated messages
3330                 // Does it start with a share?
3331                 if ((strpos($body, "[share") > 0) && $complete) {
3332                         return false;
3333                 }
3334
3335                 // Does it end with a share?
3336                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3337                         return false;
3338                 }
3339
3340                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3341                 // Skip if there is no shared message in there
3342                 if ($body == $attributes) {
3343                         return false;
3344                 }
3345
3346                 // If we don't do the complete check we quit here
3347
3348                 $guid = "";
3349                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3350                 if (!empty($matches[1])) {
3351                         $guid = $matches[1];
3352                 }
3353
3354                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3355                 if (!empty($matches[1])) {
3356                         $guid = $matches[1];
3357                 }
3358
3359                 if (($guid != "") && $complete) {
3360                         $condition = ['guid' => $guid, 'network' => [NETWORK_DFRN, NETWORK_DIASPORA]];
3361                         $item = Item::selectFirst(['contact-id'], $condition);
3362                         if (DBA::isResult($item)) {
3363                                 $ret= [];
3364                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3365                                 $ret["root_guid"] = $guid;
3366                                 return $ret;
3367                         } elseif ($complete) {
3368                                 // We are resharing something that isn't a DFRN or Diaspora post.
3369                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3370                                 return false;
3371                         }
3372                 } elseif (($guid == "") && $complete) {
3373                         return false;
3374                 }
3375
3376                 $ret["root_guid"] = $guid;
3377
3378                 $profile = "";
3379                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3380                 if (!empty($matches[1])) {
3381                         $profile = $matches[1];
3382                 }
3383
3384                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3385                 if (!empty($matches[1])) {
3386                         $profile = $matches[1];
3387                 }
3388
3389                 $ret= [];
3390
3391                 if ($profile != "") {
3392                         if (Contact::getIdForURL($profile)) {
3393                                 $author = Contact::getDetailsByURL($profile);
3394                                 $ret["root_handle"] = $author['addr'];
3395                         }
3396                 }
3397
3398                 if (empty($ret) && !$complete) {
3399                         return true;
3400                 }
3401
3402                 return $ret;
3403         }
3404
3405         /**
3406          * @brief Create an event array
3407          *
3408          * @param integer $event_id The id of the event
3409          *
3410          * @return array with event data
3411          */
3412         private static function buildEvent($event_id)
3413         {
3414                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3415                 if (!DBA::isResult($r)) {
3416                         return [];
3417                 }
3418
3419                 $event = $r[0];
3420
3421                 $eventdata = [];
3422
3423                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3424                 if (!DBA::isResult($r)) {
3425                         return [];
3426                 }
3427
3428                 $user = $r[0];
3429
3430                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3431                 if (!DBA::isResult($r)) {
3432                         return [];
3433                 }
3434
3435                 $owner = $r[0];
3436
3437                 $eventdata['author'] = self::myHandle($owner);
3438
3439                 if ($event['guid']) {
3440                         $eventdata['guid'] = $event['guid'];
3441                 }
3442
3443                 $mask = DateTimeFormat::ATOM;
3444
3445                 /// @todo - establish "all day" events in Friendica
3446                 $eventdata["all_day"] = "false";
3447
3448                 if (!$event['adjust']) {
3449                         $eventdata['timezone'] = $user['timezone'];
3450
3451                         if ($eventdata['timezone'] == "") {
3452                                 $eventdata['timezone'] = 'UTC';
3453                         }
3454                 }
3455
3456                 if ($event['start']) {
3457                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3458                 }
3459                 if ($event['finish'] && !$event['nofinish']) {
3460                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3461                 }
3462                 if ($event['summary']) {
3463                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3464                 }
3465                 if ($event['desc']) {
3466                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3467                 }
3468                 if ($event['location']) {
3469                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3470                         $coord = Map::getCoordinates($event['location']);
3471
3472                         $location = [];
3473                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3474                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3475                                 $location["lat"] = $coord['lat'];
3476                                 $location["lng"] = $coord['lon'];
3477                         } else {
3478                                 $location["lat"] = 0;
3479                                 $location["lng"] = 0;
3480                         }
3481                         $eventdata['location'] = $location;
3482                 }
3483
3484                 return $eventdata;
3485         }
3486
3487         /**
3488          * @brief Create a post (status message or reshare)
3489          *
3490          * @param array $item  The item that will be exported
3491          * @param array $owner the array of the item owner
3492          *
3493          * @return array
3494          * 'type' -> Message type ("status_message" or "reshare")
3495          * 'message' -> Array of XML elements of the status
3496          */
3497         public static function buildStatus(array $item, array $owner)
3498         {
3499                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3500
3501                 $result = Cache::get($cachekey);
3502                 if (!is_null($result)) {
3503                         return $result;
3504                 }
3505
3506                 $myaddr = self::myHandle($owner);
3507
3508                 $public = (($item["private"]) ? "false" : "true");
3509
3510                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3511
3512                 // Detect a share element and do a reshare
3513                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3514                         $message = ["author" => $myaddr,
3515                                         "guid" => $item["guid"],
3516                                         "created_at" => $created,
3517                                         "root_author" => $ret["root_handle"],
3518                                         "root_guid" => $ret["root_guid"],
3519                                         "provider_display_name" => $item["app"],
3520                                         "public" => $public];
3521
3522                         $type = "reshare";
3523                 } else {
3524                         $title = $item["title"];
3525                         $body = $item["body"];
3526
3527                         if ($item['author-link'] != $item['owner-link']) {
3528                                 require_once 'mod/share.php';
3529                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3530                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3531                         }
3532
3533                         // convert to markdown
3534                         $body = html_entity_decode(BBCode::toMarkdown($body));
3535
3536                         // Adding the title
3537                         if (strlen($title)) {
3538                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3539                         }
3540
3541                         if ($item["attach"]) {
3542                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3543                                 if ($cnt) {
3544                                         $body .= "\n".L10n::t("Attachments:")."\n";
3545                                         foreach ($matches as $mtch) {
3546                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3547                                         }
3548                                 }
3549                         }
3550
3551                         $location = [];
3552
3553                         if ($item["location"] != "")
3554                                 $location["address"] = $item["location"];
3555
3556                         if ($item["coord"] != "") {
3557                                 $coord = explode(" ", $item["coord"]);
3558                                 $location["lat"] = $coord[0];
3559                                 $location["lng"] = $coord[1];
3560                         }
3561
3562                         $message = ["author" => $myaddr,
3563                                         "guid" => $item["guid"],
3564                                         "created_at" => $created,
3565                                         "public" => $public,
3566                                         "text" => $body,
3567                                         "provider_display_name" => $item["app"],
3568                                         "location" => $location];
3569
3570                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3571                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3572                                 unset($message["location"]);
3573                         }
3574
3575                         if ($item['event-id'] > 0) {
3576                                 $event = self::buildEvent($item['event-id']);
3577                                 if (count($event)) {
3578                                         $message['event'] = $event;
3579
3580                                         if (!empty($event['location']['address']) &&
3581                                                 !empty($event['location']['lat']) &&
3582                                                 !empty($event['location']['lng'])) {
3583                                                 $message['location'] = $event['location'];
3584                                         }
3585
3586                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3587                                         // $message['text'] = '';
3588                                 }
3589                         }
3590
3591                         $type = "status_message";
3592                 }
3593
3594                 $msg = ["type" => $type, "message" => $message];
3595
3596                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3597
3598                 return $msg;
3599         }
3600
3601         /**
3602          * @brief Sends a post
3603          *
3604          * @param array $item         The item that will be exported
3605          * @param array $owner        the array of the item owner
3606          * @param array $contact      Target of the communication
3607          * @param bool  $public_batch Is it a public post?
3608          *
3609          * @return int The result of the transmission
3610          */
3611         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3612         {
3613                 $status = self::buildStatus($item, $owner);
3614
3615                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3616         }
3617
3618         /**
3619          * @brief Creates a "like" object
3620          *
3621          * @param array $item  The item that will be exported
3622          * @param array $owner the array of the item owner
3623          *
3624          * @return array The data for a "like"
3625          */
3626         private static function constructLike(array $item, array $owner)
3627         {
3628                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3629                 if (!DBA::isResult($parent)) {
3630                         return false;
3631                 }
3632
3633                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3634                 $positive = null;
3635                 if ($item['verb'] === ACTIVITY_LIKE) {
3636                         $positive = "true";
3637                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3638                         $positive = "false";
3639                 }
3640
3641                 return(["author" => self::myHandle($owner),
3642                                 "guid" => $item["guid"],
3643                                 "parent_guid" => $parent["guid"],
3644                                 "parent_type" => $target_type,
3645                                 "positive" => $positive,
3646                                 "author_signature" => ""]);
3647         }
3648
3649         /**
3650          * @brief Creates an "EventParticipation" object
3651          *
3652          * @param array $item  The item that will be exported
3653          * @param array $owner the array of the item owner
3654          *
3655          * @return array The data for an "EventParticipation"
3656          */
3657         private static function constructAttend(array $item, array $owner)
3658         {
3659                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3660                 if (!DBA::isResult($parent)) {
3661                         return false;
3662                 }
3663
3664                 switch ($item['verb']) {
3665                         case ACTIVITY_ATTEND:
3666                                 $attend_answer = 'accepted';
3667                                 break;
3668                         case ACTIVITY_ATTENDNO:
3669                                 $attend_answer = 'declined';
3670                                 break;
3671                         case ACTIVITY_ATTENDMAYBE:
3672                                 $attend_answer = 'tentative';
3673                                 break;
3674                         default:
3675                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3676                                 return false;
3677                 }
3678
3679                 return(["author" => self::myHandle($owner),
3680                                 "guid" => $item["guid"],
3681                                 "parent_guid" => $parent["guid"],
3682                                 "status" => $attend_answer,
3683                                 "author_signature" => ""]);
3684         }
3685
3686         /**
3687          * @brief Creates the object for a comment
3688          *
3689          * @param array $item  The item that will be exported
3690          * @param array $owner the array of the item owner
3691          *
3692          * @return array The data for a comment
3693          */
3694         private static function constructComment(array $item, array $owner)
3695         {
3696                 $cachekey = "diaspora:constructComment:".$item['guid'];
3697
3698                 $result = Cache::get($cachekey);
3699                 if (!is_null($result)) {
3700                         return $result;
3701                 }
3702
3703                 $parent = Item::selectFirst(['guid'], ['id' => $item["parent"], 'parent' => $item["parent"]]);
3704                 if (!DBA::isResult($parent)) {
3705                         return false;
3706                 }
3707
3708                 $text = html_entity_decode(BBCode::toMarkdown($item["body"]));
3709                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3710
3711                 $comment = ["author" => self::myHandle($owner),
3712                                 "guid" => $item["guid"],
3713                                 "created_at" => $created,
3714                                 "parent_guid" => $parent["guid"],
3715                                 "text" => $text,
3716                                 "author_signature" => ""];
3717
3718                 // Send the thread parent guid only if it is a threaded comment
3719                 if ($item['thr-parent'] != $item['parent-uri']) {
3720                         $comment['thread_parent_guid'] = self::getGuidFromUri($item['thr-parent'], $item['uid']);
3721                 }
3722
3723                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3724
3725                 return($comment);
3726         }
3727
3728         /**
3729          * @brief Send a like or a comment
3730          *
3731          * @param array $item         The item that will be exported
3732          * @param array $owner        the array of the item owner
3733          * @param array $contact      Target of the communication
3734          * @param bool  $public_batch Is it a public post?
3735          *
3736          * @return int The result of the transmission
3737          */
3738         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3739         {
3740                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3741                         $message = self::constructAttend($item, $owner);
3742                         $type = "event_participation";
3743                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3744                         $message = self::constructLike($item, $owner);
3745                         $type = "like";
3746                 } else {
3747                         $message = self::constructComment($item, $owner);
3748                         $type = "comment";
3749                 }
3750
3751                 if (!$message) {
3752                         return false;
3753                 }
3754
3755                 $message["author_signature"] = self::signature($owner, $message);
3756
3757                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3758         }
3759
3760         /**
3761          * @brief Creates a message from a signature record entry
3762          *
3763          * @param array $item      The item that will be exported
3764          * @param array $signature The entry of the "sign" record
3765          *
3766          * @return string The message
3767          */
3768         private static function messageFromSignature(array $item, array $signature)
3769         {
3770                 // Split the signed text
3771                 $signed_parts = explode(";", $signature['signed_text']);
3772
3773                 if ($item["deleted"]) {
3774                         $message = ["author" => $signature['signer'],
3775                                         "target_guid" => $signed_parts[0],
3776                                         "target_type" => $signed_parts[1]];
3777                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3778                         $message = ["author" => $signed_parts[4],
3779                                         "guid" => $signed_parts[1],
3780                                         "parent_guid" => $signed_parts[3],
3781                                         "parent_type" => $signed_parts[2],
3782                                         "positive" => $signed_parts[0],
3783                                         "author_signature" => $signature['signature'],
3784                                         "parent_author_signature" => ""];
3785                 } else {
3786                         // Remove the comment guid
3787                         $guid = array_shift($signed_parts);
3788
3789                         // Remove the parent guid
3790                         $parent_guid = array_shift($signed_parts);
3791
3792                         // Remove the handle
3793                         $handle = array_pop($signed_parts);
3794
3795                         // Glue the parts together
3796                         $text = implode(";", $signed_parts);
3797
3798                         $message = ["author" => $handle,
3799                                         "guid" => $guid,
3800                                         "parent_guid" => $parent_guid,
3801                                         "text" => implode(";", $signed_parts),
3802                                         "author_signature" => $signature['signature'],
3803                                         "parent_author_signature" => ""];
3804                 }
3805                 return $message;
3806         }
3807
3808         /**
3809          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3810          *
3811          * @param array $item         The item that will be exported
3812          * @param array $owner        the array of the item owner
3813          * @param array $contact      Target of the communication
3814          * @param bool  $public_batch Is it a public post?
3815          *
3816          * @return int The result of the transmission
3817          */
3818         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3819         {
3820                 if ($item["deleted"]) {
3821                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3822                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3823                         $type = "like";
3824                 } else {
3825                         $type = "comment";
3826                 }
3827
3828                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3829
3830                 // fetch the original signature
3831
3832                 $r = q(
3833                         "SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3834                         intval($item["id"])
3835                 );
3836
3837                 if (!$r) {
3838                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3839                         return false;
3840                 }
3841
3842                 $signature = $r[0];
3843
3844                 // Old way - is used by the internal Friendica functions
3845                 /// @todo Change all signatur storing functions to the new format
3846                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer']) {
3847                         $message = self::messageFromSignature($item, $signature);
3848                 } else {// New way
3849                         $msg = json_decode($signature['signed_text'], true);
3850
3851                         $message = [];
3852                         if (is_array($msg)) {
3853                                 foreach ($msg as $field => $data) {
3854                                         if (!$item["deleted"]) {
3855                                                 if ($field == "diaspora_handle") {
3856                                                         $field = "author";
3857                                                 }
3858                                                 if ($field == "target_type") {
3859                                                         $field = "parent_type";
3860                                                 }
3861                                         }
3862
3863                                         $message[$field] = $data;
3864                                 }
3865                         } else {
3866                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3867                         }
3868                 }
3869
3870                 $message["parent_author_signature"] = self::signature($owner, $message);
3871
3872                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3873
3874                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3875         }
3876
3877         /**
3878          * @brief Sends a retraction (deletion) of a message, like or comment
3879          *
3880          * @param array $item         The item that will be exported
3881          * @param array $owner        the array of the item owner
3882          * @param array $contact      Target of the communication
3883          * @param bool  $public_batch Is it a public post?
3884          * @param bool  $relay        Is the retraction transmitted from a relay?
3885          *
3886          * @return int The result of the transmission
3887          */
3888         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3889         {
3890                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3891
3892                 $msg_type = "retraction";
3893
3894                 if ($item['id'] == $item['parent']) {
3895                         $target_type = "Post";
3896                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3897                         $target_type = "Like";
3898                 } else {
3899                         $target_type = "Comment";
3900                 }
3901
3902                 $message = ["author" => $itemaddr,
3903                                 "target_guid" => $item['guid'],
3904                                 "target_type" => $target_type];
3905
3906                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3907
3908                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3909         }
3910
3911         /**
3912          * @brief Sends a mail
3913          *
3914          * @param array $item    The item that will be exported
3915          * @param array $owner   The owner
3916          * @param array $contact Target of the communication
3917          *
3918          * @return int The result of the transmission
3919          */
3920         public static function sendMail(array $item, array $owner, array $contact)
3921         {
3922                 $myaddr = self::myHandle($owner);
3923
3924                 $r = q(
3925                         "SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3926                         intval($item["convid"]),
3927                         intval($item["uid"])
3928                 );
3929
3930                 if (!DBA::isResult($r)) {
3931                         logger("conversation not found.");
3932                         return;
3933                 }
3934                 $cnv = $r[0];
3935
3936                 $conv = [
3937                         "author" => $cnv["creator"],
3938                         "guid" => $cnv["guid"],
3939                         "subject" => $cnv["subject"],
3940                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
3941                         "participants" => $cnv["recips"]
3942                 ];
3943
3944                 $body = BBCode::toMarkdown($item["body"]);
3945                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3946
3947                 $msg = [
3948                         "author" => $myaddr,
3949                         "guid" => $item["guid"],
3950                         "conversation_guid" => $cnv["guid"],
3951                         "text" => $body,
3952                         "created_at" => $created,
3953                 ];
3954
3955                 if ($item["reply"]) {
3956                         $message = $msg;
3957                         $type = "message";
3958                 } else {
3959                         $message = [
3960                                         "author" => $cnv["creator"],
3961                                         "guid" => $cnv["guid"],
3962                                         "subject" => $cnv["subject"],
3963                                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
3964                                         "participants" => $cnv["recips"],
3965                                         "message" => $msg];
3966
3967                         $type = "conversation";
3968                 }
3969
3970                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
3971         }
3972
3973         /**
3974          * @brief Split a name into first name and last name
3975          *
3976          * @param string $name The name
3977          *
3978          * @return array The array with "first" and "last"
3979          */
3980         public static function splitName($name) {
3981                 $name = trim($name);
3982
3983                 // Is the name longer than 64 characters? Then cut the rest of it.
3984                 if (strlen($name) > 64) {
3985                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
3986                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
3987                         } else {
3988                                 $name = substr($name, 0, 64);
3989                         }
3990                 }
3991
3992                 // Take the first word as first name
3993                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
3994                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3995                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3996                         return ['first' => $first, 'last' => $last];
3997                 }
3998
3999                 // Take the last word as last name
4000                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4001                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4002
4003                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4004                         return ['first' => $first, 'last' => $last];
4005                 }
4006
4007                 // Take the first 32 characters if there is no space in the first 32 characters
4008                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4009                         $first = substr($name, 0, 32);
4010                         $last = substr($name, 32);
4011                         return ['first' => $first, 'last' => $last];
4012                 }
4013
4014                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4015                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4016
4017                 // Check if the last name is longer than 32 characters
4018                 if (strlen($last) > 32) {
4019                         if (strpos($last, ' ') <= 32) {
4020                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4021                         } else {
4022                                 $last = substr($last, 0, 32);
4023                         }
4024                 }
4025
4026                 return ['first' => $first, 'last' => $last];
4027         }
4028
4029         /**
4030          * @brief Create profile data
4031          *
4032          * @param int $uid The user id
4033          *
4034          * @return array The profile data
4035          */
4036         private static function createProfileData($uid)
4037         {
4038                 $r = q(
4039                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4040                         FROM `profile`
4041                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4042                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4043                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4044                         intval($uid)
4045                 );
4046
4047                 if (!$r) {
4048                         return [];
4049                 }
4050
4051                 $profile = $r[0];
4052                 $handle = $profile["addr"];
4053
4054                 $split_name = self::splitName($profile['name']);
4055                 $first = $split_name['first'];
4056                 $last = $split_name['last'];
4057
4058                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4059                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4060                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4061                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4062
4063                 $dob = null;
4064                 $about = null;
4065                 $location = null;
4066                 $tags = null;
4067                 if ($searchable === 'true') {
4068                         $dob = '';
4069
4070                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4071                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4072                                 if ($year < 1004) {
4073                                         $year = 1004;
4074                                 }
4075                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4076                         }
4077
4078                         $about = $profile['about'];
4079                         $about = strip_tags(BBCode::convert($about));
4080
4081                         $location = Profile::formatLocation($profile);
4082                         $tags = '';
4083                         if ($profile['pub_keywords']) {
4084                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4085                                 $kw = str_replace('  ', ' ', $kw);
4086                                 $arr = explode(' ', $profile['pub_keywords']);
4087                                 if (count($arr)) {
4088                                         for ($x = 0; $x < 5; $x ++) {
4089                                                 if (!empty($arr[$x])) {
4090                                                         $tags .= '#'. trim($arr[$x]) .' ';
4091                                                 }
4092                                         }
4093                                 }
4094                         }
4095                         $tags = trim($tags);
4096                 }
4097
4098                 return ["author" => $handle,
4099                                 "first_name" => $first,
4100                                 "last_name" => $last,
4101                                 "image_url" => $large,
4102                                 "image_url_medium" => $medium,
4103                                 "image_url_small" => $small,
4104                                 "birthday" => $dob,
4105                                 "gender" => $profile['gender'],
4106                                 "bio" => $about,
4107                                 "location" => $location,
4108                                 "searchable" => $searchable,
4109                                 "nsfw" => "false",
4110                                 "tag_string" => $tags];
4111         }
4112
4113         /**
4114          * @brief Sends profile data
4115          *
4116          * @param int  $uid    The user id
4117          * @param bool $recips optional, default false
4118          * @return void
4119          */
4120         public static function sendProfile($uid, $recips = false)
4121         {
4122                 if (!$uid) {
4123                         return;
4124                 }
4125
4126                 $owner = User::getOwnerDataById($uid);
4127                 if (!$owner) {
4128                         return;
4129                 }
4130
4131                 if (!$recips) {
4132                         $recips = q(
4133                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4134                                 AND `uid` = %d AND `rel` != %d",
4135                                 DBA::escape(NETWORK_DIASPORA),
4136                                 intval($uid),
4137                                 intval(Contact::SHARING)
4138                         );
4139                 }
4140
4141                 if (!$recips) {
4142                         return;
4143                 }
4144
4145                 $message = self::createProfileData($uid);
4146
4147                 foreach ($recips as $recip) {
4148                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
4149                         self::buildAndTransmit($owner, $recip, "profile", $message, false, "", false);
4150                 }
4151         }
4152
4153         /**
4154          * @brief Stores the signature for likes that are created on our system
4155          *
4156          * @param array $contact The contact array of the "like"
4157          * @param int   $post_id The post id of the "like"
4158          *
4159          * @return bool Success
4160          */
4161         public static function storeLikeSignature(array $contact, $post_id)
4162         {
4163                 // Is the contact the owner? Then fetch the private key
4164                 if (!$contact['self'] || ($contact['uid'] == 0)) {
4165                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
4166                         return false;
4167                 }
4168
4169                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
4170                 if (!DBA::isResult($r)) {
4171                         return false;
4172                 }
4173
4174                 $contact["uprvkey"] = $r[0]['prvkey'];
4175
4176                 $item = Item::selectFirst([], ['id' => $post_id]);
4177                 if (!DBA::isResult($item)) {
4178                         return false;
4179                 }
4180
4181                 if (!in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4182                         return false;
4183                 }
4184
4185                 $message = self::constructLike($item, $contact);
4186                 if ($message === false) {
4187                         return false;
4188                 }
4189
4190                 $message["author_signature"] = self::signature($contact, $message);
4191
4192                 /*
4193                  * Now store the signature more flexible to dynamically support new fields.
4194                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4195                  */
4196                 DBA::insert('sign', ['iid' => $post_id, 'signed_text' => json_encode($message)]);
4197
4198                 logger('Stored diaspora like signature');
4199                 return true;
4200         }
4201
4202         /**
4203          * @brief Stores the signature for comments that are created on our system
4204          *
4205          * @param array  $item       The item array of the comment
4206          * @param array  $contact    The contact array of the item owner
4207          * @param string $uprvkey    The private key of the sender
4208          * @param int    $message_id The message id of the comment
4209          *
4210          * @return bool Success
4211          */
4212         public static function storeCommentSignature(array $item, array $contact, $uprvkey, $message_id)
4213         {
4214                 if ($uprvkey == "") {
4215                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
4216                         return false;
4217                 }
4218
4219                 $contact["uprvkey"] = $uprvkey;
4220
4221                 $message = self::constructComment($item, $contact);
4222                 if ($message === false) {
4223                         return false;
4224                 }
4225
4226                 $message["author_signature"] = self::signature($contact, $message);
4227
4228                 /*
4229                  * Now store the signature more flexible to dynamically support new fields.
4230                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4231                  */
4232                 DBA::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($message)]);
4233
4234                 logger('Stored diaspora comment signature');
4235                 return true;
4236         }
4237 }