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