src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @file src/Protocol/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  *
   6  * The new protocol is described here: http://diaspora.github.io/diaspora_federation/index.html
   7  * This implementation here interprets the old and the new protocol and sends the new one.
   8  * In the future we will remove most stuff from "validPosting" and interpret only the new protocol.
   9  */
  10
  11 namespace Friendica\Protocol;
  12
  13 use Friendica\Content\Text\BBCode;
  14 use Friendica\Content\Text\Markdown;
  15 use Friendica\Core\Cache;
  16 use Friendica\Core\Config;
  17 use Friendica\Core\L10n;
  18 use Friendica\Core\PConfig;
  19 use Friendica\Core\System;
  20 use Friendica\Core\Worker;
  21 use Friendica\Database\DBM;
  22 use Friendica\Model\Contact;
  23 use Friendica\Model\GContact;
  24 use Friendica\Model\Group;
  25 use Friendica\Model\Item;
  26 use Friendica\Model\Profile;
  27 use Friendica\Model\Queue;
  28 use Friendica\Model\User;
  29 use Friendica\Network\Probe;
  30 use Friendica\Util\Crypto;
  31 use Friendica\Util\DateTimeFormat;
  32 use Friendica\Util\Network;
  33 use Friendica\Util\XML;
  34 use Friendica\Util\Map;
  35 use dba;
  36 use SimpleXMLElement;
  37
  38 require_once 'include/dba.php';
  39 require_once 'include/items.php';
  40
  41 /**
  42  * @brief This class contain functions to create and send Diaspora XML files
  43  *
  44  */
  45 class Diaspora
  46 {
  47         /**
  48          * @brief Return a list of relay servers
  49          *
  50          * The list contains not only the official relays but also servers that we serve directly
  51          *
  52          * @param integer $item_id  The id of the item that is sent
  53          * @param array   $contacts The previously fetched contacts
  54          *
  55          * @return array of relay servers
  56          */
  57         public static function relayList($item_id, $contacts = [])
  58         {
  59                 $serverlist = [];
  60
  61                 // Fetching relay servers
  62                 $serverdata = Config::get("system", "relay_server");
  63                 if ($serverdata != "") {
  64                         $servers = explode(",", $serverdata);
  65                         foreach ($servers as $server) {
  66                                 $serverlist[$server] = trim($server);
  67                         }
  68                 }
  69
  70                 if (Config::get("system", "relay_directly", false)) {
  71                         // We distribute our stuff based on the parent to ensure that the thread will be complete
  72                         $parent = dba::selectFirst('item', ['parent'], ['id' => $item_id]);
  73                         if (!DBM::is_result($parent)) {
  74                                 return;
  75                         }
  76
  77                         // Servers that want to get all content
  78                         $servers = dba::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  79                         while ($server = dba::fetch($servers)) {
  80                                 $serverlist[$server['url']] = $server['url'];
  81                         }
  82
  83                         // All tags of the current post
  84                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
  85                         $tags = dba::select('term', ['term'], $condition);
  86                         $taglist = [];
  87                         while ($tag = dba::fetch($tags)) {
  88                                 $taglist[] = $tag['term'];
  89                         }
  90
  91                         // All servers who wants content with this tag
  92                         $tagserverlist = [];
  93                         if (!empty($taglist)) {
  94                                 $tagserver = dba::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  95                                 while ($server = dba::fetch($tagserver)) {
  96                                         $tagserverlist[] = $server['gserver-id'];
  97                                 }
  98                         }
  99
 100                         // All adresses with the given id
 101                         if (!empty($tagserverlist)) {
 102                                 $servers = dba::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 103                                 while ($server = dba::fetch($servers)) {
 104                                         $serverlist[$server['url']] = $server['url'];
 105                                 }
 106                         }
 107                 }
 108
 109                 // Now we are collecting all relay contacts
 110                 foreach ($serverlist as $server_url) {
 111                         // We don't send messages to ourselves
 112                         if (link_compare($server_url, System::baseUrl())) {
 113                                 continue;
 114                         }
 115                         $contact = self::getRelayContact($server_url);
 116                         if (is_bool($contact)) {
 117                                 continue;
 118                         }
 119
 120                         $exists = false;
 121                         foreach ($contacts as $entry) {
 122                                 if ($entry['batch'] == $contact['batch']) {
 123                                         $exists = true;
 124                                 }
 125                         }
 126
 127                         if (!$exists) {
 128                                 $contacts[] = $contact;
 129                         }
 130                 }
 131
 132                 return $contacts;
 133         }
 134
 135         /**
 136          * @brief Return a contact for a given server address or creates a dummy entry
 137          *
 138          * @param string $server_url The url of the server
 139          * @return array with the contact
 140          */
 141         private static function getRelayContact($server_url)
 142         {
 143                 $fields = ['batch', 'id', 'name', 'network', 'archive', 'blocked'];
 144
 145                 // Fetch the relay contact
 146                 $condition = ['uid' => 0, 'nurl' => normalise_link($server_url),
 147                         'contact-type' => ACCOUNT_TYPE_RELAY];
 148                 $contact = dba::selectFirst('contact', $fields, $condition);
 149
 150                 if (DBM::is_result($contact)) {
 151                         if ($contact['archive'] || $contact['blocked']) {
 152                                 return false;
 153                         }
 154                         return $contact;
 155                 } else {
 156                         self::setRelayContact($server_url);
 157
 158                         $contact = dba::selectFirst('contact', $fields, $condition);
 159                         if (DBM::is_result($contact)) {
 160                                 return $contact;
 161                         }
 162                 }
 163
 164                 // It should never happen that we arrive here
 165                 return [];
 166         }
 167
 168         /**
 169          * @brief Update or insert a relay contact
 170          *
 171          * @param string $server_url The url of the server
 172          * @param array $network_fields Optional network specific fields
 173          */
 174         public static function setRelayContact($server_url, $network_fields = [])
 175         {
 176                 $fields = ['created' => DateTimeFormat::utcNow(),
 177                         'name' => 'relay', 'nick' => 'relay',
 178                         'url' => $server_url, 'network' => NETWORK_DIASPORA,
 179                         'batch' => $server_url . '/receive/public',
 180                         'rel' => CONTACT_IS_FOLLOWER, 'blocked' => false,
 181                         'pending' => false, 'writable' => true];
 182
 183                 $fields = array_merge($fields, $network_fields);
 184
 185                 $condition = ['uid' => 0, 'nurl' => normalise_link($server_url),
 186                         'contact-type' => ACCOUNT_TYPE_RELAY];
 187
 188                 if (dba::exists('contact', $condition)) {
 189                         unset($fields['created']);
 190                 }
 191
 192                 dba::update('contact', $fields, $condition, true);
 193         }
 194
 195         /**
 196          * @brief Return a list of participating contacts for a thread
 197          *
 198          * This is used for the participation feature.
 199          * One of the parameters is a contact array.
 200          * This is done to avoid duplicates.
 201          *
 202          * @param integer $thread   The id of the thread
 203          * @param array   $contacts The previously fetched contacts
 204          *
 205          * @return array of relay servers
 206          */
 207         public static function participantsForThread($thread, $contacts)
 208         {
 209                 $r = dba::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
 210                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 211                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 212                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 213                                 WHERE `participation`.`iid` = ?", $thread);
 214
 215                 while ($contact = dba::fetch($r)) {
 216                         if (!empty($contact['fnetwork'])) {
 217                                 $contact['network'] = $contact['fnetwork'];
 218                         }
 219                         unset($contact['fnetwork']);
 220
 221                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 222                                 $contact['batch'] = $contact['fbatch'];
 223                         }
 224                         unset($contact['fbatch']);
 225
 226                         $exists = false;
 227                         foreach ($contacts as $entry) {
 228                                 if ($entry['batch'] == $contact['batch']) {
 229                                         $exists = true;
 230                                 }
 231                         }
 232
 233                         if (!$exists) {
 234                                 $contacts[] = $contact;
 235                         }
 236                 }
 237                 dba::close($r);
 238
 239                 return $contacts;
 240         }
 241
 242         /**
 243          * @brief repairs a signature that was double encoded
 244          *
 245          * The function is unused at the moment. It was copied from the old implementation.
 246          *
 247          * @param string  $signature The signature
 248          * @param string  $handle    The handle of the signature owner
 249          * @param integer $level     This value is only set inside this function to avoid endless loops
 250          *
 251          * @return string the repaired signature
 252          */
 253         private static function repairSignature($signature, $handle = "", $level = 1)
 254         {
 255                 if ($signature == "") {
 256                         return ($signature);
 257                 }
 258
 259                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 260                         $signature = base64_decode($signature);
 261                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
 262
 263                         // Do a recursive call to be able to fix even multiple levels
 264                         if ($level < 10) {
 265                                 $signature = self::repairSignature($signature, $handle, ++$level);
 266                         }
 267                 }
 268
 269                 return($signature);
 270         }
 271
 272         /**
 273          * @brief verify the envelope and return the verified data
 274          *
 275          * @param string $envelope The magic envelope
 276          *
 277          * @return string verified data
 278          */
 279         private static function verifyMagicEnvelope($envelope)
 280         {
 281                 $basedom = XML::parseString($envelope);
 282
 283                 if (!is_object($basedom)) {
 284                         logger("Envelope is no XML file");
 285                         return false;
 286                 }
 287
 288                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 289
 290                 if (sizeof($children) == 0) {
 291                         logger("XML has no children");
 292                         return false;
 293                 }
 294
 295                 $handle = "";
 296
 297                 $data = base64url_decode($children->data);
 298                 $type = $children->data->attributes()->type[0];
 299
 300                 $encoding = $children->encoding;
 301
 302                 $alg = $children->alg;
 303
 304                 $sig = base64url_decode($children->sig);
 305                 $key_id = $children->sig->attributes()->key_id[0];
 306                 if ($key_id != "") {
 307                         $handle = base64url_decode($key_id);
 308                 }
 309
 310                 $b64url_data = base64url_encode($data);
 311                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 312
 313                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 314
 315                 if ($handle == '') {
 316                         logger('No author could be decoded. Discarding. Message: ' . $envelope);
 317                         return false;
 318                 }
 319
 320                 $key = self::key($handle);
 321                 if ($key == '') {
 322                         logger("Couldn't get a key for handle " . $handle . ". Discarding.");
 323                         return false;
 324                 }
 325
 326                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 327                 if (!$verify) {
 328                         logger('Message from ' . $handle . ' did not verify. Discarding.');
 329                         return false;
 330                 }
 331
 332                 return $data;
 333         }
 334
 335         /**
 336          * @brief encrypts data via AES
 337          *
 338          * @param string $key  The AES key
 339          * @param string $iv   The IV (is used for CBC encoding)
 340          * @param string $data The data that is to be encrypted
 341          *
 342          * @return string encrypted data
 343          */
 344         private static function aesEncrypt($key, $iv, $data)
 345         {
 346                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 347         }
 348
 349         /**
 350          * @brief decrypts data via AES
 351          *
 352          * @param string $key       The AES key
 353          * @param string $iv        The IV (is used for CBC encoding)
 354          * @param string $encrypted The encrypted data
 355          *
 356          * @return string decrypted data
 357          */
 358         private static function aesDecrypt($key, $iv, $encrypted)
 359         {
 360                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 361         }
 362
 363         /**
 364          * @brief: Decodes incoming Diaspora message in the new format
 365          *
 366          * @param array  $importer Array of the importer user
 367          * @param string $raw      raw post message
 368          *
 369          * @return array
 370          * 'message' -> decoded Diaspora XML message
 371          * 'author' -> author diaspora handle
 372          * 'key' -> author public key (converted to pkcs#8)
 373          */
 374         public static function decodeRaw($importer, $raw)
 375         {
 376                 $data = json_decode($raw);
 377
 378                 // Is it a private post? Then decrypt the outer Salmon
 379                 if (is_object($data)) {
 380                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 381                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 382
 383                         $outer_key_bundle = '';
 384                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 385                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 386
 387                         if (!is_object($j_outer_key_bundle)) {
 388                                 logger('Outer Salmon did not verify. Discarding.');
 389                                 System::httpExit(400);
 390                         }
 391
 392                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 393                         $outer_key = base64_decode($j_outer_key_bundle->key);
 394
 395                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 396                 } else {
 397                         $xml = $raw;
 398                 }
 399
 400                 $basedom = XML::parseString($xml);
 401
 402                 if (!is_object($basedom)) {
 403                         logger('Received data does not seem to be an XML. Discarding. '.$xml);
 404                         System::httpExit(400);
 405                 }
 406
 407                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 408
 409                 // Not sure if this cleaning is needed
 410                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 411
 412                 // Build the signed data
 413                 $type = $base->data[0]->attributes()->type[0];
 414                 $encoding = $base->encoding;
 415                 $alg = $base->alg;
 416                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 417
 418                 // This is the signature
 419                 $signature = base64url_decode($base->sig);
 420
 421                 // Get the senders' public key
 422                 $key_id = $base->sig[0]->attributes()->key_id[0];
 423                 $author_addr = base64_decode($key_id);
 424                 if ($author_addr == '') {
 425                         logger('No author could be decoded. Discarding. Message: ' . $xml);
 426                         System::httpExit(400);
 427                 }
 428
 429                 $key = self::key($author_addr);
 430                 if ($key == '') {
 431                         logger("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 432                         System::httpExit(400);
 433                 }
 434
 435                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 436                 if (!$verify) {
 437                         logger('Message did not verify. Discarding.');
 438                         System::httpExit(400);
 439                 }
 440
 441                 return ['message' => (string)base64url_decode($base->data),
 442                                 'author' => unxmlify($author_addr),
 443                                 'key' => (string)$key];
 444         }
 445
 446         /**
 447          * @brief: Decodes incoming Diaspora message in the deprecated format
 448          *
 449          * @param array  $importer Array of the importer user
 450          * @param string $xml      urldecoded Diaspora salmon
 451          *
 452          * @return array
 453          * 'message' -> decoded Diaspora XML message
 454          * 'author' -> author diaspora handle
 455          * 'key' -> author public key (converted to pkcs#8)
 456          */
 457         public static function decode($importer, $xml)
 458         {
 459                 $public = false;
 460                 $basedom = XML::parseString($xml);
 461
 462                 if (!is_object($basedom)) {
 463                         logger("XML is not parseable.");
 464                         return false;
 465                 }
 466                 $children = $basedom->children('https://joindiaspora.com/protocol');
 467
 468                 $inner_aes_key = null;
 469                 $inner_iv = null;
 470
 471                 if ($children->header) {
 472                         $public = true;
 473                         $author_link = str_replace('acct:', '', $children->header->author_id);
 474                 } else {
 475                         // This happens with posts from a relais
 476                         if (!$importer) {
 477                                 logger("This is no private post in the old format", LOGGER_DEBUG);
 478                                 return false;
 479                         }
 480
 481                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 482
 483                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 484                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 485
 486                         $outer_key_bundle = '';
 487                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 488
 489                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 490
 491                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 492                         $outer_key = base64_decode($j_outer_key_bundle->key);
 493
 494                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 495
 496                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 497                         $idom = XML::parseString($decrypted);
 498
 499                         $inner_iv = base64_decode($idom->iv);
 500                         $inner_aes_key = base64_decode($idom->aes_key);
 501
 502                         $author_link = str_replace('acct:', '', $idom->author_id);
 503                 }
 504
 505                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 506
 507                 // figure out where in the DOM tree our data is hiding
 508
 509                 $base = null;
 510                 if ($dom->provenance->data) {
 511                         $base = $dom->provenance;
 512                 } elseif ($dom->env->data) {
 513                         $base = $dom->env;
 514                 } elseif ($dom->data) {
 515                         $base = $dom;
 516                 }
 517
 518                 if (!$base) {
 519                         logger('unable to locate salmon data in xml');
 520                         System::httpExit(400);
 521                 }
 522
 523
 524                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 525                 $signature = base64url_decode($base->sig);
 526
 527                 // unpack the  data
 528
 529                 // strip whitespace so our data element will return to one big base64 blob
 530                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 531
 532
 533                 // stash away some other stuff for later
 534
 535                 $type = $base->data[0]->attributes()->type[0];
 536                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 537                 $encoding = $base->encoding;
 538                 $alg = $base->alg;
 539
 540
 541                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 542
 543
 544                 // decode the data
 545                 $data = base64url_decode($data);
 546
 547
 548                 if ($public) {
 549                         $inner_decrypted = $data;
 550                 } else {
 551                         // Decode the encrypted blob
 552                         $inner_encrypted = base64_decode($data);
 553                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 554                 }
 555
 556                 if (!$author_link) {
 557                         logger('Could not retrieve author URI.');
 558                         System::httpExit(400);
 559                 }
 560                 // Once we have the author URI, go to the web and try to find their public key
 561                 // (first this will look it up locally if it is in the fcontact cache)
 562                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 563
 564                 logger('Fetching key for '.$author_link);
 565                 $key = self::key($author_link);
 566
 567                 if (!$key) {
 568                         logger('Could not retrieve author key.');
 569                         System::httpExit(400);
 570                 }
 571
 572                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 573
 574                 if (!$verify) {
 575                         logger('Message did not verify. Discarding.');
 576                         System::httpExit(400);
 577                 }
 578
 579                 logger('Message verified.');
 580
 581                 return ['message' => (string)$inner_decrypted,
 582                                 'author' => unxmlify($author_link),
 583                                 'key' => (string)$key];
 584         }
 585
 586
 587         /**
 588          * @brief Dispatches public messages and find the fitting receivers
 589          *
 590          * @param array $msg The post that will be dispatched
 591          *
 592          * @return int The message id of the generated message, "true" or "false" if there was an error
 593          */
 594         public static function dispatchPublic($msg)
 595         {
 596                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 597                 if (!$enabled) {
 598                         logger("diaspora is disabled");
 599                         return false;
 600                 }
 601
 602                 if (!($fields = self::validPosting($msg))) {
 603                         logger("Invalid posting");
 604                         return false;
 605                 }
 606
 607                 $importer = ["uid" => 0, "page-flags" => PAGE_FREELOVE];
 608                 $success = self::dispatch($importer, $msg, $fields);
 609
 610                 return $success;
 611         }
 612
 613         /**
 614          * @brief Dispatches the different message types to the different functions
 615          *
 616          * @param array  $importer Array of the importer user
 617          * @param array  $msg      The post that will be dispatched
 618          * @param object $fields   SimpleXML object that contains the message
 619          *
 620          * @return int The message id of the generated message, "true" or "false" if there was an error
 621          */
 622         public static function dispatch($importer, $msg, $fields = null)
 623         {
 624                 // The sender is the handle of the contact that sent the message.
 625                 // This will often be different with relayed messages (for example "like" and "comment")
 626                 $sender = $msg["author"];
 627
 628                 // This is only needed for private postings since this is already done for public ones before
 629                 if (is_null($fields)) {
 630                         $private = true;
 631                         if (!($fields = self::validPosting($msg))) {
 632                                 logger("Invalid posting");
 633                                 return false;
 634                         }
 635                 } else {
 636                         $private = false;
 637                 }
 638
 639                 $type = $fields->getName();
 640
 641                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 642
 643                 switch ($type) {
 644                         case "account_migration":
 645                                 if (!$private) {
 646                                         logger('Message with type ' . $type . ' is not private, quitting.');
 647                                         return false;
 648                                 }
 649                                 return self::receiveAccountMigration($importer, $fields);
 650
 651                         case "account_deletion":
 652                                 return self::receiveAccountDeletion($fields);
 653
 654                         case "comment":
 655                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 656
 657                         case "contact":
 658                                 if (!$private) {
 659                                         logger('Message with type ' . $type . ' is not private, quitting.');
 660                                         return false;
 661                                 }
 662                                 return self::receiveContactRequest($importer, $fields);
 663
 664                         case "conversation":
 665                                 if (!$private) {
 666                                         logger('Message with type ' . $type . ' is not private, quitting.');
 667                                         return false;
 668                                 }
 669                                 return self::receiveConversation($importer, $msg, $fields);
 670
 671                         case "like":
 672                                 return self::receiveLike($importer, $sender, $fields);
 673
 674                         case "message":
 675                                 if (!$private) {
 676                                         logger('Message with type ' . $type . ' is not private, quitting.');
 677                                         return false;
 678                                 }
 679                                 return self::receiveMessage($importer, $fields);
 680
 681                         case "participation":
 682                                 if (!$private) {
 683                                         logger('Message with type ' . $type . ' is not private, quitting.');
 684                                         return false;
 685                                 }
 686                                 return self::receiveParticipation($importer, $fields);
 687
 688                         case "photo": // Not implemented
 689                                 return self::receivePhoto($importer, $fields);
 690
 691                         case "poll_participation": // Not implemented
 692                                 return self::receivePollParticipation($importer, $fields);
 693
 694                         case "profile":
 695                                 if (!$private) {
 696                                         logger('Message with type ' . $type . ' is not private, quitting.');
 697                                         return false;
 698                                 }
 699                                 return self::receiveProfile($importer, $fields);
 700
 701                         case "reshare":
 702                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 703
 704                         case "retraction":
 705                                 return self::receiveRetraction($importer, $sender, $fields);
 706
 707                         case "status_message":
 708                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 709
 710                         default:
 711                                 logger("Unknown message type ".$type);
 712                                 return false;
 713                 }
 714
 715                 return true;
 716         }
 717
 718         /**
 719          * @brief Checks if a posting is valid and fetches the data fields.
 720          *
 721          * This function does not only check the signature.
 722          * It also does the conversion between the old and the new diaspora format.
 723          *
 724          * @param array $msg Array with the XML, the sender handle and the sender signature
 725          *
 726          * @return bool|array If the posting is valid then an array with an SimpleXML object is returned
 727          */
 728         private static function validPosting($msg)
 729         {
 730                 $data = XML::parseString($msg["message"]);
 731
 732                 if (!is_object($data)) {
 733                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 734                         return false;
 735                 }
 736
 737                 // Is this the new or the old version?
 738                 if ($data->getName() == "XML") {
 739                         $oldXML = true;
 740                         foreach ($data->post->children() as $child) {
 741                                 $element = $child;
 742                         }
 743                 } else {
 744                         $oldXML = false;
 745                         $element = $data;
 746                 }
 747
 748                 $type = $element->getName();
 749                 $orig_type = $type;
 750
 751                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 752
 753                 // All retractions are handled identically from now on.
 754                 // In the new version there will only be "retraction".
 755                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 756                         $type = "retraction";
 757
 758                 if ($type == "request") {
 759                         $type = "contact";
 760                 }
 761
 762                 $fields = new SimpleXMLElement("<".$type."/>");
 763
 764                 $signed_data = "";
 765                 $author_signature = null;
 766                 $parent_author_signature = null;
 767
 768                 foreach ($element->children() as $fieldname => $entry) {
 769                         if ($oldXML) {
 770                                 // Translation for the old XML structure
 771                                 if ($fieldname == "diaspora_handle") {
 772                                         $fieldname = "author";
 773                                 }
 774                                 if ($fieldname == "participant_handles") {
 775                                         $fieldname = "participants";
 776                                 }
 777                                 if (in_array($type, ["like", "participation"])) {
 778                                         if ($fieldname == "target_type") {
 779                                                 $fieldname = "parent_type";
 780                                         }
 781                                 }
 782                                 if ($fieldname == "sender_handle") {
 783                                         $fieldname = "author";
 784                                 }
 785                                 if ($fieldname == "recipient_handle") {
 786                                         $fieldname = "recipient";
 787                                 }
 788                                 if ($fieldname == "root_diaspora_id") {
 789                                         $fieldname = "root_author";
 790                                 }
 791                                 if ($type == "status_message") {
 792                                         if ($fieldname == "raw_message") {
 793                                                 $fieldname = "text";
 794                                         }
 795                                 }
 796                                 if ($type == "retraction") {
 797                                         if ($fieldname == "post_guid") {
 798                                                 $fieldname = "target_guid";
 799                                         }
 800                                         if ($fieldname == "type") {
 801                                                 $fieldname = "target_type";
 802                                         }
 803                                 }
 804                         }
 805
 806                         if (($fieldname == "author_signature") && ($entry != "")) {
 807                                 $author_signature = base64_decode($entry);
 808                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 809                                 $parent_author_signature = base64_decode($entry);
 810                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 811                                 if ($signed_data != "") {
 812                                         $signed_data .= ";";
 813                                 }
 814
 815                                 $signed_data .= $entry;
 816                         }
 817                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 818                                 || ($orig_type == "relayable_retraction")
 819                         ) {
 820                                 XML::copy($entry, $fields, $fieldname);
 821                         }
 822                 }
 823
 824                 // This is something that shouldn't happen at all.
 825                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 826                         if ($msg["author"] != $fields->author) {
 827                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 828                                 return false;
 829                         }
 830                 }
 831
 832                 // Only some message types have signatures. So we quit here for the other types.
 833                 if (!in_array($type, ["comment", "like"])) {
 834                         return $fields;
 835                 }
 836                 // No author_signature? This is a must, so we quit.
 837                 if (!isset($author_signature)) {
 838                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 839                         return false;
 840                 }
 841
 842                 if (isset($parent_author_signature)) {
 843                         $key = self::key($msg["author"]);
 844                         if (empty($key)) {
 845                                 logger("No key found for parent author ".$msg["author"], LOGGER_DEBUG);
 846                                 return false;
 847                         }
 848
 849                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 850                                 logger("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 851                                 return false;
 852                         }
 853                 }
 854
 855                 $key = self::key($fields->author);
 856                 if (empty($key)) {
 857                         logger("No key found for author ".$fields->author, LOGGER_DEBUG);
 858                         return false;
 859                 }
 860
 861                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 862                         logger("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 863                         return false;
 864                 } else {
 865                         return $fields;
 866                 }
 867         }
 868
 869         /**
 870          * @brief Fetches the public key for a given handle
 871          *
 872          * @param string $handle The handle
 873          *
 874          * @return string The public key
 875          */
 876         private static function key($handle)
 877         {
 878                 $handle = strval($handle);
 879
 880                 logger("Fetching diaspora key for: ".$handle);
 881
 882                 $r = self::personByHandle($handle);
 883                 if ($r) {
 884                         return $r["pubkey"];
 885                 }
 886
 887                 return "";
 888         }
 889
 890         /**
 891          * @brief Fetches data for a given handle
 892          *
 893          * @param string $handle The handle
 894          *
 895          * @return array the queried data
 896          */
 897         public static function personByHandle($handle)
 898         {
 899                 $update = false;
 900
 901                 $person = dba::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 902                 if (DBM::is_result($person)) {
 903                         logger("In cache " . print_r($person, true), LOGGER_DEBUG);
 904
 905                         // update record occasionally so it doesn't get stale
 906                         $d = strtotime($person["updated"]." +00:00");
 907                         if ($d < strtotime("now - 14 days")) {
 908                                 $update = true;
 909                         }
 910
 911                         if ($person["guid"] == "") {
 912                                 $update = true;
 913                         }
 914                 }
 915
 916                 if (!DBM::is_result($person) || $update) {
 917                         logger("create or refresh", LOGGER_DEBUG);
 918                         $r = Probe::uri($handle, NETWORK_DIASPORA);
 919
 920                         // Note that Friendica contacts will return a "Diaspora person"
 921                         // if Diaspora connectivity is enabled on their server
 922                         if ($r && ($r["network"] === NETWORK_DIASPORA)) {
 923                                 self::updateFContact($r);
 924
 925                                 // Fetch the updated or added contact
 926                                 $person = dba::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 927                                 if (!DBM::is_result($person)) {
 928                                         $person = $r;
 929                                 }
 930                         }
 931                 }
 932
 933                 return $person;
 934         }
 935
 936         /**
 937          * @brief Updates the fcontact table
 938          *
 939          * @param array $arr The fcontact data
 940          */
 941         private static function updateFContact($arr)
 942         {
 943                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
 944                         'request' => $arr["request"], 'nick' => $arr["nick"],
 945                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
 946                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
 947                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
 948                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
 949                         'updated' => DateTimeFormat::utcNow()];
 950
 951                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
 952
 953                 dba::update('fcontact', $fields, $condition, true);
 954         }
 955
 956         /**
 957          * @brief get a handle (user@domain.tld) from a given contact id
 958          *
 959          * @param int $contact_id  The id in the contact table
 960          * @param int $pcontact_id The id in the contact table (Used for the public contact)
 961          *
 962          * @return string the handle
 963          */
 964         private static function handleFromContact($contact_id, $pcontact_id = 0)
 965         {
 966                 $handle = false;
 967
 968                 logger("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, LOGGER_DEBUG);
 969
 970                 if ($pcontact_id != 0) {
 971                         $r = q(
 972                                 "SELECT `addr` FROM `contact` WHERE `id` = %d AND `addr` != ''",
 973                                 intval($pcontact_id)
 974                         );
 975
 976                         if (DBM::is_result($r)) {
 977                                 return strtolower($r[0]["addr"]);
 978                         }
 979                 }
 980
 981                 $r = q(
 982                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 983                         intval($contact_id)
 984                 );
 985
 986                 if (DBM::is_result($r)) {
 987                         $contact = $r[0];
 988
 989                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 990
 991                         if ($contact['addr'] != "") {
 992                                 $handle = $contact['addr'];
 993                         } else {
 994                                 $baseurl_start = strpos($contact['url'], '://') + 3;
 995                                 // allows installations in a subdirectory--not sure how Diaspora will handle
 996                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
 997                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 998                                 $handle = $contact['nick'].'@'.$baseurl;
 999                         }
1000                 }
1001
1002                 return strtolower($handle);
1003         }
1004
1005         /**
1006          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1007          * fcontact guid
1008          *
1009          * @param mixed $fcontact_guid Hexadecimal string guid
1010          *
1011          * @return string the contact url or null
1012          */
1013         public static function urlFromContactGuid($fcontact_guid)
1014         {
1015                 logger("fcontact guid is ".$fcontact_guid, LOGGER_DEBUG);
1016
1017                 $r = q(
1018                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1019                         dbesc(NETWORK_DIASPORA),
1020                         dbesc($fcontact_guid)
1021                 );
1022
1023                 if (DBM::is_result($r)) {
1024                         return $r[0]['url'];
1025                 }
1026
1027                 return null;
1028         }
1029
1030         /**
1031          * @brief Get a contact id for a given handle
1032          *
1033          * @todo Move to Friendica\Model\Contact
1034          *
1035          * @param int    $uid    The user id
1036          * @param string $handle The handle in the format user@domain.tld
1037          *
1038          * @return int Contact id
1039          */
1040         private static function contactByHandle($uid, $handle)
1041         {
1042                 // First do a direct search on the contact table
1043                 $r = q(
1044                         "SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
1045                         intval($uid),
1046                         dbesc($handle)
1047                 );
1048
1049                 if (DBM::is_result($r)) {
1050                         return $r[0];
1051                 } else {
1052                         /*
1053                          * We haven't found it?
1054                          * We use another function for it that will possibly create a contact entry.
1055                          */
1056                         $cid = Contact::getIdForURL($handle, $uid);
1057
1058                         if ($cid > 0) {
1059                                 /// @TODO Contact retrieval should be encapsulated into an "entity" class like `Contact`
1060                                 $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($cid));
1061
1062                                 if (DBM::is_result($r)) {
1063                                         return $r[0];
1064                                 }
1065                         }
1066                 }
1067
1068                 $handle_parts = explode("@", $handle);
1069                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
1070                 $r = q(
1071                         "SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
1072                         dbesc(NETWORK_DFRN),
1073                         intval($uid),
1074                         dbesc($nurl_sql)
1075                 );
1076                 if (DBM::is_result($r)) {
1077                         return $r[0];
1078                 }
1079
1080                 logger("Haven't found contact for user ".$uid." and handle ".$handle, LOGGER_DEBUG);
1081                 return false;
1082         }
1083
1084         /**
1085          * @brief Check if posting is allowed for this contact
1086          *
1087          * @param array $importer   Array of the importer user
1088          * @param array $contact    The contact that is checked
1089          * @param bool  $is_comment Is the check for a comment?
1090          *
1091          * @return bool is the contact allowed to post?
1092          */
1093         private static function postAllow($importer, $contact, $is_comment = false)
1094         {
1095                 /*
1096                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1097                  * That makes us friends.
1098                  * Normally this should have handled by getting a request - but this could get lost
1099                  */
1100                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1101                 // It is not removed by now. Possibly the code is needed?
1102                 //if (!$is_comment && $contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1103                 //      dba::update(
1104                 //              'contact',
1105                 //              array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
1106                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1107                 //      );
1108                 //
1109                 //      $contact["rel"] = CONTACT_IS_FRIEND;
1110                 //      logger("defining user ".$contact["nick"]." as friend");
1111                 //}
1112
1113                 // We don't seem to like that person
1114                 if ($contact["blocked"]) {
1115                         // Maybe blocked, don't accept.
1116                         return false;
1117                         // We are following this person?
1118                 } elseif (($contact["rel"] == CONTACT_IS_SHARING) || ($contact["rel"] == CONTACT_IS_FRIEND)) {
1119                         // Yes, then it is fine.
1120                         return true;
1121                         // Is it a post to a community?
1122                 } elseif (($contact["rel"] == CONTACT_IS_FOLLOWER) && in_array($importer["page-flags"], [PAGE_COMMUNITY, PAGE_PRVGROUP])) {
1123                         // That's good
1124                         return true;
1125                         // Is the message a global user or a comment?
1126                 } elseif (($importer["uid"] == 0) || $is_comment) {
1127                         // Messages for the global users and comments are always accepted
1128                         return true;
1129                 }
1130
1131                 return false;
1132         }
1133
1134         /**
1135          * @brief Fetches the contact id for a handle and checks if posting is allowed
1136          *
1137          * @param array  $importer   Array of the importer user
1138          * @param string $handle     The checked handle in the format user@domain.tld
1139          * @param bool   $is_comment Is the check for a comment?
1140          *
1141          * @return array The contact data
1142          */
1143         private static function allowedContactByHandle($importer, $handle, $is_comment = false)
1144         {
1145                 $contact = self::contactByHandle($importer["uid"], $handle);
1146                 if (!$contact) {
1147                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1148                         // If a contact isn't found, we accept it anyway if it is a comment
1149                         if ($is_comment) {
1150                                 return $importer;
1151                         } else {
1152                                 return false;
1153                         }
1154                 }
1155
1156                 if (!self::postAllow($importer, $contact, $is_comment)) {
1157                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1158                         return false;
1159                 }
1160                 return $contact;
1161         }
1162
1163         /**
1164          * @brief Does the message already exists on the system?
1165          *
1166          * @param int    $uid  The user id
1167          * @param string $guid The guid of the message
1168          *
1169          * @return int|bool message id if the message already was stored into the system - or false.
1170          */
1171         private static function messageExists($uid, $guid)
1172         {
1173                 $r = q(
1174                         "SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1175                         intval($uid),
1176                         dbesc($guid)
1177                 );
1178
1179                 if (DBM::is_result($r)) {
1180                         logger("message ".$guid." already exists for user ".$uid);
1181                         return $r[0]["id"];
1182                 }
1183
1184                 return false;
1185         }
1186
1187         /**
1188          * @brief Checks for links to posts in a message
1189          *
1190          * @param array $item The item array
1191          * @return void
1192          */
1193         private static function fetchGuid($item)
1194         {
1195                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1196                 preg_replace_callback(
1197                         $expression,
1198                         function ($match) use ($item) {
1199                                 self::fetchGuidSub($match, $item);
1200                         },
1201                         $item["body"]
1202                 );
1203
1204                 preg_replace_callback(
1205                         "&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1206                         function ($match) use ($item) {
1207                                 self::fetchGuidSub($match, $item);
1208                         },
1209                         $item["body"]
1210                 );
1211         }
1212
1213         /**
1214          * @brief Checks for relative /people/* links in an item body to match local
1215          * contacts or prepends the remote host taken from the author link.
1216          *
1217          * @param string $body        The item body to replace links from
1218          * @param string $author_link The author link for missing local contact fallback
1219          *
1220          * @return string the replaced string
1221          */
1222         public static function replacePeopleGuid($body, $author_link)
1223         {
1224                 $return = preg_replace_callback(
1225                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1226                         function ($match) use ($author_link) {
1227                                 // $match
1228                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1229                                 // 1 => '0123456789abcdef'
1230                                 // 2 => 'Foo Bar'
1231                                 $handle = self::urlFromContactGuid($match[1]);
1232
1233                                 if ($handle) {
1234                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1235                                 } else {
1236                                         // No local match, restoring absolute remote URL from author scheme and host
1237                                         $author_url = parse_url($author_link);
1238                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1239                                 }
1240
1241                                 return $return;
1242                         },
1243                         $body
1244                 );
1245
1246                 return $return;
1247         }
1248
1249         /**
1250          * @brief sub function of "fetchGuid" which checks for links in messages
1251          *
1252          * @param array $match array containing a link that has to be checked for a message link
1253          * @param array $item  The item array
1254          * @return void
1255          */
1256         private static function fetchGuidSub($match, $item)
1257         {
1258                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1259                         self::storeByGuid($match[1], $item["owner-link"]);
1260                 }
1261         }
1262
1263         /**
1264          * @brief Fetches an item with a given guid from a given server
1265          *
1266          * @param string $guid   the message guid
1267          * @param string $server The server address
1268          * @param int    $uid    The user id of the user
1269          *
1270          * @return int the message id of the stored message or false
1271          */
1272         private static function storeByGuid($guid, $server, $uid = 0)
1273         {
1274                 $serverparts = parse_url($server);
1275                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1276
1277                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
1278
1279                 $msg = self::message($guid, $server);
1280
1281                 if (!$msg) {
1282                         return false;
1283                 }
1284
1285                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
1286
1287                 // Now call the dispatcher
1288                 return self::dispatchPublic($msg);
1289         }
1290
1291         /**
1292          * @brief Fetches a message from a server
1293          *
1294          * @param string $guid   message guid
1295          * @param string $server The url of the server
1296          * @param int    $level  Endless loop prevention
1297          *
1298          * @return array
1299          *      'message' => The message XML
1300          *      'author' => The author handle
1301          *      'key' => The public key of the author
1302          */
1303         private static function message($guid, $server, $level = 0)
1304         {
1305                 if ($level > 5) {
1306                         return false;
1307                 }
1308
1309                 // This will work for new Diaspora servers and Friendica servers from 3.5
1310                 $source_url = $server."/fetch/post/".urlencode($guid);
1311
1312                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1313
1314                 $envelope = Network::fetchUrl($source_url);
1315                 if ($envelope) {
1316                         logger("Envelope was fetched.", LOGGER_DEBUG);
1317                         $x = self::verifyMagicEnvelope($envelope);
1318                         if (!$x) {
1319                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
1320                         } else {
1321                                 logger("Envelope was verified.", LOGGER_DEBUG);
1322                         }
1323                 } else {
1324                         $x = false;
1325                 }
1326
1327                 // This will work for older Diaspora and Friendica servers
1328                 if (!$x) {
1329                         $source_url = $server."/p/".urlencode($guid).".xml";
1330                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1331
1332                         $x = Network::fetchUrl($source_url);
1333                         if (!$x) {
1334                                 return false;
1335                         }
1336                 }
1337
1338                 $source_xml = XML::parseString($x);
1339
1340                 if (!is_object($source_xml)) {
1341                         return false;
1342                 }
1343
1344                 if ($source_xml->post->reshare) {
1345                         // Reshare of a reshare - old Diaspora version
1346                         logger("Message is a reshare", LOGGER_DEBUG);
1347                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1348                 } elseif ($source_xml->getName() == "reshare") {
1349                         // Reshare of a reshare - new Diaspora version
1350                         logger("Message is a new reshare", LOGGER_DEBUG);
1351                         return self::message($source_xml->root_guid, $server, ++$level);
1352                 }
1353
1354                 $author = "";
1355
1356                 // Fetch the author - for the old and the new Diaspora version
1357                 if ($source_xml->post->status_message->diaspora_handle) {
1358                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1359                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1360                         $author = (string)$source_xml->author;
1361                 }
1362
1363                 // If this isn't a "status_message" then quit
1364                 if (!$author) {
1365                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
1366                         return false;
1367                 }
1368
1369                 $msg = ["message" => $x, "author" => $author];
1370
1371                 $msg["key"] = self::key($msg["author"]);
1372
1373                 return $msg;
1374         }
1375
1376         /**
1377          * @brief Fetches the item record of a given guid
1378          *
1379          * @param int    $uid     The user id
1380          * @param string $guid    message guid
1381          * @param string $author  The handle of the item
1382          * @param array  $contact The contact of the item owner
1383          *
1384          * @return array the item record
1385          */
1386         private static function parentItem($uid, $guid, $author, $contact)
1387         {
1388                 $r = q(
1389                         "SELECT `id`, `parent`, `body`, `wall`, `uri`, `guid`, `private`, `origin`,
1390                                 `author-name`, `author-link`, `author-avatar`,
1391                                 `owner-name`, `owner-link`, `owner-avatar`
1392                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1393                         intval($uid),
1394                         dbesc($guid)
1395                 );
1396
1397                 if (!$r) {
1398                         $result = self::storeByGuid($guid, $contact["url"], $uid);
1399
1400                         if (!$result) {
1401                                 $person = self::personByHandle($author);
1402                                 $result = self::storeByGuid($guid, $person["url"], $uid);
1403                         }
1404
1405                         if ($result) {
1406                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
1407
1408                                 $r = q(
1409                                         "SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
1410                                                 `author-name`, `author-link`, `author-avatar`,
1411                                                 `owner-name`, `owner-link`, `owner-avatar`
1412                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1413                                         intval($uid),
1414                                         dbesc($guid)
1415                                 );
1416                         }
1417                 }
1418
1419                 if (!$r) {
1420                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
1421                         return false;
1422                 } else {
1423                         logger("parent item found: parent: ".$guid." - user: ".$uid);
1424                         return $r[0];
1425                 }
1426         }
1427
1428         /**
1429          * @brief returns contact details
1430          *
1431          * @param array $def_contact The default contact if the person isn't found
1432          * @param array $person      The record of the person
1433          * @param int   $uid         The user id
1434          *
1435          * @return array
1436          *      'cid' => contact id
1437          *      'network' => network type
1438          */
1439         private static function authorContactByUrl($def_contact, $person, $uid)
1440         {
1441                 $condition = ['nurl' => normalise_link($person["url"]), 'uid' => $uid];
1442                 $contact = dba::selectFirst('contact', ['id', 'network'], $condition);
1443                 if (DBM::is_result($contact)) {
1444                         $cid = $contact["id"];
1445                         $network = $contact["network"];
1446                 } else {
1447                         $cid = $def_contact["id"];
1448                         $network = NETWORK_DIASPORA;
1449                 }
1450
1451                 return ["cid" => $cid, "network" => $network];
1452         }
1453
1454         /**
1455          * @brief Is the profile a hubzilla profile?
1456          *
1457          * @param string $url The profile link
1458          *
1459          * @return bool is it a hubzilla server?
1460          */
1461         public static function isRedmatrix($url)
1462         {
1463                 return(strstr($url, "/channel/"));
1464         }
1465
1466         /**
1467          * @brief Generate a post link with a given handle and message guid
1468          *
1469          * @param string $addr        The user handle
1470          * @param string $guid        message guid
1471          * @param string $parent_guid optional parent guid
1472          *
1473          * @return string the post link
1474          */
1475         private static function plink($addr, $guid, $parent_guid = '')
1476         {
1477                 $contact = Contact::getDetailsByAddr($addr);
1478
1479                 // Fallback
1480                 if (!$contact) {
1481                         if ($parent_guid != '') {
1482                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1483                         } else {
1484                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1485                         }
1486                 }
1487
1488                 if ($contact["network"] == NETWORK_DFRN) {
1489                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1490                 }
1491
1492                 if (self::isRedmatrix($contact["url"])) {
1493                         return $contact["url"] . "/?f=&mid=" . $guid;
1494                 }
1495
1496                 if ($parent_guid != '') {
1497                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1498                 } else {
1499                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1500                 }
1501         }
1502
1503         /**
1504          * @brief Receives account migration
1505          *
1506          * @param array  $importer Array of the importer user
1507          * @param object $data     The message object
1508          *
1509          * @return bool Success
1510          */
1511         private static function receiveAccountMigration($importer, $data)
1512         {
1513                 $old_handle = notags(unxmlify($data->author));
1514                 $new_handle = notags(unxmlify($data->profile->author));
1515                 $signature = notags(unxmlify($data->signature));
1516
1517                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1518                 if (!$contact) {
1519                         logger("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1520                         return false;
1521                 }
1522
1523                 logger("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1524
1525                 // Check signature
1526                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1527                 $key = self::key($old_handle);
1528                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1529                         logger('No valid signature for migration.');
1530                         return false;
1531                 }
1532
1533                 // Update the profile
1534                 self::receiveProfile($importer, $data->profile);
1535
1536                 // change the technical stuff in contact and gcontact
1537                 $data = Probe::uri($new_handle);
1538                 if ($data['network'] == NETWORK_PHANTOM) {
1539                         logger('Account for '.$new_handle." couldn't be probed.");
1540                         return false;
1541                 }
1542
1543                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1544                                 'name' => $data['name'], 'nick' => $data['nick'],
1545                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1546                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1547                                 'network' => $data['network']];
1548
1549                 dba::update('contact', $fields, ['addr' => $old_handle]);
1550
1551                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1552                                 'name' => $data['name'], 'nick' => $data['nick'],
1553                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1554                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1555                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1556
1557                 dba::update('gcontact', $fields, ['addr' => $old_handle]);
1558
1559                 logger('Contacts are updated.');
1560
1561                 // update items
1562                 // This is an extreme performance killer
1563                 Item::update(['owner-link' => $data["url"]], ['owner-link' => $contact["url"], 'uid' => $importer["uid"]]);
1564                 Item::update(['author-link' => $data["url"]], ['author-link' => $contact["url"], 'uid' => $importer["uid"]]);
1565
1566                 logger('Items are updated.');
1567
1568                 return true;
1569         }
1570
1571         /**
1572          * @brief Processes an account deletion
1573          *
1574          * @param object $data     The message object
1575          *
1576          * @return bool Success
1577          */
1578         private static function receiveAccountDeletion($data)
1579         {
1580                 $author = notags(unxmlify($data->author));
1581
1582                 $contacts = dba::select('contact', ['id'], ['addr' => $author]);
1583                 while ($contact = dba::fetch($contacts)) {
1584                         Contact::remove($contact["id"]);
1585                 }
1586
1587                 dba::delete('gcontact', ['addr' => $author]);
1588
1589                 logger('Removed contacts for ' . $author);
1590
1591                 return true;
1592         }
1593
1594         /**
1595          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1596          *
1597          * @param string  $author    Author handle
1598          * @param string  $guid      Message guid
1599          * @param boolean $onlyfound Only return uri when found in the database
1600          *
1601          * @return string The constructed uri or the one from our database
1602          */
1603         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1604         {
1605                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1606                 if (DBM::is_result($r)) {
1607                         return $r[0]["uri"];
1608                 } elseif (!$onlyfound) {
1609                         return $author.":".$guid;
1610                 }
1611
1612                 return "";
1613         }
1614
1615         /**
1616          * @brief Fetch the guid from our database with a given uri
1617          *
1618          * @param string $uri Message uri
1619          * @param string $uid Author handle
1620          *
1621          * @return string The post guid
1622          */
1623         private static function getGuidFromUri($uri, $uid)
1624         {
1625                 $r = q("SELECT `guid` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($uri), intval($uid));
1626                 if (DBM::is_result($r)) {
1627                         return $r[0]["guid"];
1628                 } else {
1629                         return false;
1630                 }
1631         }
1632
1633         /**
1634          * @brief Find the best importer for a comment, like, ...
1635          *
1636          * @param string $guid The guid of the item
1637          *
1638          * @return array|boolean the origin owner of that post - or false
1639          */
1640         private static function importerForGuid($guid)
1641         {
1642                 $item = dba::fetch_first("SELECT `uid` FROM `item` WHERE `origin` AND `guid` = ? LIMIT 1", $guid);
1643
1644                 if (DBM::is_result($item)) {
1645                         logger("Found user ".$item['uid']." as owner of item ".$guid, LOGGER_DEBUG);
1646                         $contact = dba::fetch_first("SELECT * FROM `contact` WHERE `self` AND `uid` = ?", $item['uid']);
1647                         if (DBM::is_result($contact)) {
1648                                 return $contact;
1649                         }
1650                 }
1651                 return false;
1652         }
1653
1654         /**
1655          * @brief Processes an incoming comment
1656          *
1657          * @param array  $importer Array of the importer user
1658          * @param string $sender   The sender of the message
1659          * @param object $data     The message object
1660          * @param string $xml      The original XML of the message
1661          *
1662          * @return int The message id of the generated comment or "false" if there was an error
1663          */
1664         private static function receiveComment($importer, $sender, $data, $xml)
1665         {
1666                 $author = notags(unxmlify($data->author));
1667                 $guid = notags(unxmlify($data->guid));
1668                 $parent_guid = notags(unxmlify($data->parent_guid));
1669                 $text = unxmlify($data->text);
1670
1671                 if (isset($data->created_at)) {
1672                         $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1673                 } else {
1674                         $created_at = DateTimeFormat::utcNow();
1675                 }
1676
1677                 if (isset($data->thread_parent_guid)) {
1678                         $thread_parent_guid = notags(unxmlify($data->thread_parent_guid));
1679                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1680                 } else {
1681                         $thr_uri = "";
1682                 }
1683
1684                 $contact = self::allowedContactByHandle($importer, $sender, true);
1685                 if (!$contact) {
1686                         return false;
1687                 }
1688
1689                 $message_id = self::messageExists($importer["uid"], $guid);
1690                 if ($message_id) {
1691                         return true;
1692                 }
1693
1694                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1695                 if (!$parent_item) {
1696                         return false;
1697                 }
1698
1699                 $person = self::personByHandle($author);
1700                 if (!is_array($person)) {
1701                         logger("unable to find author details");
1702                         return false;
1703                 }
1704
1705                 // Fetch the contact id - if we know this contact
1706                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1707
1708                 $datarray = [];
1709
1710                 $datarray["uid"] = $importer["uid"];
1711                 $datarray["contact-id"] = $author_contact["cid"];
1712                 $datarray["network"]  = $author_contact["network"];
1713
1714                 $datarray["author-name"] = $person["name"];
1715                 $datarray["author-link"] = $person["url"];
1716                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
1717
1718                 $datarray["owner-name"] = $contact["name"];
1719                 $datarray["owner-link"] = $contact["url"];
1720                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
1721
1722                 $datarray["guid"] = $guid;
1723                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1724
1725                 $datarray["type"] = "remote-comment";
1726                 $datarray["verb"] = ACTIVITY_POST;
1727                 $datarray["gravity"] = GRAVITY_COMMENT;
1728
1729                 if ($thr_uri != "") {
1730                         $datarray["parent-uri"] = $thr_uri;
1731                 } else {
1732                         $datarray["parent-uri"] = $parent_item["uri"];
1733                 }
1734
1735                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1736
1737                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1738                 $datarray["source"] = $xml;
1739
1740                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1741
1742                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1743
1744                 $body = Markdown::toBBCode($text);
1745
1746                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1747
1748                 self::fetchGuid($datarray);
1749
1750                 // If we are the origin of the parent we store the original data.
1751                 // We notify our followers during the item storage.
1752                 if ($parent_item["origin"]) {
1753                         $datarray['diaspora_signed_text'] = json_encode($data);
1754                 }
1755
1756                 $message_id = Item::insert($datarray);
1757
1758                 if ($message_id <= 0) {
1759                         return false;
1760                 }
1761
1762                 if ($message_id) {
1763                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1764                         if ($datarray['uid'] == 0) {
1765                                 Item::distribute($message_id, json_encode($data));
1766                         }
1767                 }
1768
1769                 return true;
1770         }
1771
1772         /**
1773          * @brief processes and stores private messages
1774          *
1775          * @param array  $importer     Array of the importer user
1776          * @param array  $contact      The contact of the message
1777          * @param object $data         The message object
1778          * @param array  $msg          Array of the processed message, author handle and key
1779          * @param object $mesg         The private message
1780          * @param array  $conversation The conversation record to which this message belongs
1781          *
1782          * @return bool "true" if it was successful
1783          */
1784         private static function receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation)
1785         {
1786                 $author = notags(unxmlify($data->author));
1787                 $guid = notags(unxmlify($data->guid));
1788                 $subject = notags(unxmlify($data->subject));
1789
1790                 // "diaspora_handle" is the element name from the old version
1791                 // "author" is the element name from the new version
1792                 if ($mesg->author) {
1793                         $msg_author = notags(unxmlify($mesg->author));
1794                 } elseif ($mesg->diaspora_handle) {
1795                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1796                 } else {
1797                         return false;
1798                 }
1799
1800                 $msg_guid = notags(unxmlify($mesg->guid));
1801                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1802                 $msg_text = unxmlify($mesg->text);
1803                 $msg_created_at = DateTimeFormat::utc(notags(unxmlify($mesg->created_at)));
1804
1805                 if ($msg_conversation_guid != $guid) {
1806                         logger("message conversation guid does not belong to the current conversation.");
1807                         return false;
1808                 }
1809
1810                 $body = Markdown::toBBCode($msg_text);
1811                 $message_uri = $msg_author.":".$msg_guid;
1812
1813                 $person = self::personByHandle($msg_author);
1814
1815                 dba::lock('mail');
1816
1817                 $r = q(
1818                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1819                         dbesc($msg_guid),
1820                         intval($importer["uid"])
1821                 );
1822                 if (DBM::is_result($r)) {
1823                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1824                         return false;
1825                 }
1826
1827                 q(
1828                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1829                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1830                         intval($importer["uid"]),
1831                         dbesc($msg_guid),
1832                         intval($conversation["id"]),
1833                         dbesc($person["name"]),
1834                         dbesc($person["photo"]),
1835                         dbesc($person["url"]),
1836                         intval($contact["id"]),
1837                         dbesc($subject),
1838                         dbesc($body),
1839                         0,
1840                         0,
1841                         dbesc($message_uri),
1842                         dbesc($author.":".$guid),
1843                         dbesc($msg_created_at)
1844                 );
1845
1846                 dba::unlock();
1847
1848                 dba::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
1849
1850                 notification(
1851                         [
1852                         "type" => NOTIFY_MAIL,
1853                         "notify_flags" => $importer["notify-flags"],
1854                         "language" => $importer["language"],
1855                         "to_name" => $importer["username"],
1856                         "to_email" => $importer["email"],
1857                         "uid" =>$importer["uid"],
1858                         "item" => ["subject" => $subject, "body" => $body],
1859                         "source_name" => $person["name"],
1860                         "source_link" => $person["url"],
1861                         "source_photo" => $person["thumb"],
1862                         "verb" => ACTIVITY_POST,
1863                         "otype" => "mail"]
1864                 );
1865                 return true;
1866         }
1867
1868         /**
1869          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1870          *
1871          * @param array  $importer Array of the importer user
1872          * @param array  $msg      Array of the processed message, author handle and key
1873          * @param object $data     The message object
1874          *
1875          * @return bool Success
1876          */
1877         private static function receiveConversation($importer, $msg, $data)
1878         {
1879                 $author = notags(unxmlify($data->author));
1880                 $guid = notags(unxmlify($data->guid));
1881                 $subject = notags(unxmlify($data->subject));
1882                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1883                 $participants = notags(unxmlify($data->participants));
1884
1885                 $messages = $data->message;
1886
1887                 if (!count($messages)) {
1888                         logger("empty conversation");
1889                         return false;
1890                 }
1891
1892                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1893                 if (!$contact) {
1894                         return false;
1895                 }
1896
1897                 $conversation = null;
1898
1899                 $c = q(
1900                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1901                         intval($importer["uid"]),
1902                         dbesc($guid)
1903                 );
1904                 if ($c)
1905                         $conversation = $c[0];
1906                 else {
1907                         $r = q(
1908                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1909                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1910                                 intval($importer["uid"]),
1911                                 dbesc($guid),
1912                                 dbesc($author),
1913                                 dbesc($created_at),
1914                                 dbesc(DateTimeFormat::utcNow()),
1915                                 dbesc($subject),
1916                                 dbesc($participants)
1917                         );
1918                         if ($r) {
1919                                 $c = q(
1920                                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1921                                         intval($importer["uid"]),
1922                                         dbesc($guid)
1923                                 );
1924                         }
1925
1926                         if ($c) {
1927                                 $conversation = $c[0];
1928                         }
1929                 }
1930                 if (!$conversation) {
1931                         logger("unable to create conversation.");
1932                         return false;
1933                 }
1934
1935                 foreach ($messages as $mesg) {
1936                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1937                 }
1938
1939                 return true;
1940         }
1941
1942         /**
1943          * @brief Creates the body for a "like" message
1944          *
1945          * @param array  $contact     The contact that send us the "like"
1946          * @param array  $parent_item The item array of the parent item
1947          * @param string $guid        message guid
1948          *
1949          * @return string the body
1950          */
1951         private static function constructLikeBody($contact, $parent_item, $guid)
1952         {
1953                 $bodyverb = L10n::t('%1$s likes %2$s\'s %3$s');
1954
1955                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1956                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1957                 $plink = "[url=".System::baseUrl()."/display/".urlencode($guid)."]".L10n::t("status")."[/url]";
1958
1959                 return sprintf($bodyverb, $ulink, $alink, $plink);
1960         }
1961
1962         /**
1963          * @brief Creates a XML object for a "like"
1964          *
1965          * @param array $importer    Array of the importer user
1966          * @param array $parent_item The item array of the parent item
1967          *
1968          * @return string The XML
1969          */
1970         private static function constructLikeObject($importer, $parent_item)
1971         {
1972                 $objtype = ACTIVITY_OBJ_NOTE;
1973                 $link = '<link rel="alternate" type="text/html" href="'.System::baseUrl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1974                 $parent_body = $parent_item["body"];
1975
1976                 $xmldata = ["object" => ["type" => $objtype,
1977                                                 "local" => "1",
1978                                                 "id" => $parent_item["uri"],
1979                                                 "link" => $link,
1980                                                 "title" => "",
1981                                                 "content" => $parent_body]];
1982
1983                 return XML::fromArray($xmldata, $xml, true);
1984         }
1985
1986         /**
1987          * @brief Processes "like" messages
1988          *
1989          * @param array  $importer Array of the importer user
1990          * @param string $sender   The sender of the message
1991          * @param object $data     The message object
1992          *
1993          * @return int The message id of the generated like or "false" if there was an error
1994          */
1995         private static function receiveLike($importer, $sender, $data)
1996         {
1997                 $author = notags(unxmlify($data->author));
1998                 $guid = notags(unxmlify($data->guid));
1999                 $parent_guid = notags(unxmlify($data->parent_guid));
2000                 $parent_type = notags(unxmlify($data->parent_type));
2001                 $positive = notags(unxmlify($data->positive));
2002
2003                 // likes on comments aren't supported by Diaspora - only on posts
2004                 // But maybe this will be supported in the future, so we will accept it.
2005                 if (!in_array($parent_type, ["Post", "Comment"])) {
2006                         return false;
2007                 }
2008
2009                 $contact = self::allowedContactByHandle($importer, $sender, true);
2010                 if (!$contact) {
2011                         return false;
2012                 }
2013
2014                 $message_id = self::messageExists($importer["uid"], $guid);
2015                 if ($message_id) {
2016                         return true;
2017                 }
2018
2019                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
2020                 if (!$parent_item) {
2021                         return false;
2022                 }
2023
2024                 $person = self::personByHandle($author);
2025                 if (!is_array($person)) {
2026                         logger("unable to find author details");
2027                         return false;
2028                 }
2029
2030                 // Fetch the contact id - if we know this contact
2031                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2032
2033                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2034                 // We would accept this anyhow.
2035                 if ($positive == "true") {
2036                         $verb = ACTIVITY_LIKE;
2037                 } else {
2038                         $verb = ACTIVITY_DISLIKE;
2039                 }
2040
2041                 $datarray = [];
2042
2043                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2044
2045                 $datarray["uid"] = $importer["uid"];
2046                 $datarray["contact-id"] = $author_contact["cid"];
2047                 $datarray["network"]  = $author_contact["network"];
2048
2049                 $datarray["author-name"] = $person["name"];
2050                 $datarray["author-link"] = $person["url"];
2051                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
2052
2053                 $datarray["owner-name"] = $contact["name"];
2054                 $datarray["owner-link"] = $contact["url"];
2055                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2056
2057                 $datarray["guid"] = $guid;
2058                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2059
2060                 $datarray["type"] = "activity";
2061                 $datarray["verb"] = $verb;
2062                 $datarray["gravity"] = GRAVITY_LIKE;
2063                 $datarray["parent-uri"] = $parent_item["uri"];
2064
2065                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2066                 $datarray["object"] = self::constructLikeObject($importer, $parent_item);
2067
2068                 $datarray["body"] = self::constructLikeBody($contact, $parent_item, $guid);
2069
2070                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2071                 if ($parent_item["id"] != $parent_item["parent"]) {
2072                         $toplevel = dba::selectFirst('item', ['origin'], ['id' => $parent_item["parent"]]);
2073                         $origin = $toplevel["origin"];
2074                 } else {
2075                         $origin = $parent_item["origin"];
2076                 }
2077
2078                 // If we are the origin of the parent we store the original data.
2079                 // We notify our followers during the item storage.
2080                 if ($origin) {
2081                         $datarray['diaspora_signed_text'] = json_encode($data);
2082                 }
2083
2084                 $message_id = Item::insert($datarray);
2085
2086                 if ($message_id <= 0) {
2087                         return false;
2088                 }
2089
2090                 if ($message_id) {
2091                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2092                         if ($datarray['uid'] == 0) {
2093                                 Item::distribute($message_id, json_encode($data));
2094                         }
2095                 }
2096
2097                 return true;
2098         }
2099
2100         /**
2101          * @brief Processes private messages
2102          *
2103          * @param array  $importer Array of the importer user
2104          * @param object $data     The message object
2105          *
2106          * @return bool Success?
2107          */
2108         private static function receiveMessage($importer, $data)
2109         {
2110                 $author = notags(unxmlify($data->author));
2111                 $guid = notags(unxmlify($data->guid));
2112                 $conversation_guid = notags(unxmlify($data->conversation_guid));
2113                 $text = unxmlify($data->text);
2114                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2115
2116                 $contact = self::allowedContactByHandle($importer, $author, true);
2117                 if (!$contact) {
2118                         return false;
2119                 }
2120
2121                 $conversation = null;
2122
2123                 $c = q(
2124                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
2125                         intval($importer["uid"]),
2126                         dbesc($conversation_guid)
2127                 );
2128                 if ($c) {
2129                         $conversation = $c[0];
2130                 } else {
2131                         logger("conversation not available.");
2132                         return false;
2133                 }
2134
2135                 $message_uri = $author.":".$guid;
2136
2137                 $person = self::personByHandle($author);
2138                 if (!$person) {
2139                         logger("unable to find author details");
2140                         return false;
2141                 }
2142
2143                 $body = Markdown::toBBCode($text);
2144
2145                 $body = self::replacePeopleGuid($body, $person["url"]);
2146
2147                 dba::lock('mail');
2148
2149                 $r = q(
2150                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
2151                         dbesc($guid),
2152                         intval($importer["uid"])
2153                 );
2154                 if (DBM::is_result($r)) {
2155                         logger("duplicate message already delivered.", LOGGER_DEBUG);
2156                         return false;
2157                 }
2158
2159                 q(
2160                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
2161                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
2162                         intval($importer["uid"]),
2163                         dbesc($guid),
2164                         intval($conversation["id"]),
2165                         dbesc($person["name"]),
2166                         dbesc($person["photo"]),
2167                         dbesc($person["url"]),
2168                         intval($contact["id"]),
2169                         dbesc($conversation["subject"]),
2170                         dbesc($body),
2171                         0,
2172                         1,
2173                         dbesc($message_uri),
2174                         dbesc($author.":".$conversation["guid"]),
2175                         dbesc($created_at)
2176                 );
2177
2178                 dba::unlock();
2179
2180                 dba::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
2181                 return true;
2182         }
2183
2184         /**
2185          * @brief Processes participations - unsupported by now
2186          *
2187          * @param array  $importer Array of the importer user
2188          * @param object $data     The message object
2189          *
2190          * @return bool always true
2191          */
2192         private static function receiveParticipation($importer, $data)
2193         {
2194                 $author = strtolower(notags(unxmlify($data->author)));
2195                 $parent_guid = notags(unxmlify($data->parent_guid));
2196
2197                 $contact_id = Contact::getIdForURL($author);
2198                 if (!$contact_id) {
2199                         logger('Contact not found: '.$author);
2200                         return false;
2201                 }
2202
2203                 $person = self::personByHandle($author);
2204                 if (!is_array($person)) {
2205                         logger("Person not found: ".$author);
2206                         return false;
2207                 }
2208
2209                 $item = dba::selectFirst('item', ['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2210                 if (!DBM::is_result($item)) {
2211                         logger('Item not found, no origin or private: '.$parent_guid);
2212                         return false;
2213                 }
2214
2215                 $author_parts = explode('@', $author);
2216                 if (isset($author_parts[1])) {
2217                         $server = $author_parts[1];
2218                 } else {
2219                         // Should never happen
2220                         $server = $author;
2221                 }
2222
2223                 logger('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, LOGGER_DEBUG);
2224
2225                 if (!dba::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2226                         dba::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2227                 }
2228
2229                 // Send all existing comments and likes to the requesting server
2230                 $comments = dba::p("SELECT `item`.`id`, `item`.`verb`, `contact`.`self`
2231                                 FROM `item`
2232                                 INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2233                                 WHERE `item`.`parent` = ? AND `item`.`id` != `item`.`parent`", $item['id']);
2234                 while ($comment = dba::fetch($comments)) {
2235                         if ($comment['verb'] == ACTIVITY_POST) {
2236                                 $cmd = $comment['self'] ? 'comment-new' : 'comment-import';
2237                         } else {
2238                                 $cmd = $comment['self'] ? 'like' : 'comment-import';
2239                         }
2240                         logger("Send ".$cmd." for item ".$comment['id']." to contact ".$contact_id, LOGGER_DEBUG);
2241                         Worker::add(PRIORITY_HIGH, 'Delivery', $cmd, $comment['id'], $contact_id);
2242                 }
2243                 dba::close($comments);
2244
2245                 return true;
2246         }
2247
2248         /**
2249          * @brief Processes photos - unneeded
2250          *
2251          * @param array  $importer Array of the importer user
2252          * @param object $data     The message object
2253          *
2254          * @return bool always true
2255          */
2256         private static function receivePhoto($importer, $data)
2257         {
2258                 // There doesn't seem to be a reason for this function,
2259                 // since the photo data is transmitted in the status message as well
2260                 return true;
2261         }
2262
2263         /**
2264          * @brief Processes poll participations - unssupported
2265          *
2266          * @param array  $importer Array of the importer user
2267          * @param object $data     The message object
2268          *
2269          * @return bool always true
2270          */
2271         private static function receivePollParticipation($importer, $data)
2272         {
2273                 // We don't support polls by now
2274                 return true;
2275         }
2276
2277         /**
2278          * @brief Processes incoming profile updates
2279          *
2280          * @param array  $importer Array of the importer user
2281          * @param object $data     The message object
2282          *
2283          * @return bool Success
2284          */
2285         private static function receiveProfile($importer, $data)
2286         {
2287                 $author = strtolower(notags(unxmlify($data->author)));
2288
2289                 $contact = self::contactByHandle($importer["uid"], $author);
2290                 if (!$contact) {
2291                         return false;
2292                 }
2293
2294                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
2295                 $image_url = unxmlify($data->image_url);
2296                 $birthday = unxmlify($data->birthday);
2297                 $gender = unxmlify($data->gender);
2298                 $about = Markdown::toBBCode(unxmlify($data->bio));
2299                 $location = Markdown::toBBCode(unxmlify($data->location));
2300                 $searchable = (unxmlify($data->searchable) == "true");
2301                 $nsfw = (unxmlify($data->nsfw) == "true");
2302                 $tags = unxmlify($data->tag_string);
2303
2304                 $tags = explode("#", $tags);
2305
2306                 $keywords = [];
2307                 foreach ($tags as $tag) {
2308                         $tag = trim(strtolower($tag));
2309                         if ($tag != "") {
2310                                 $keywords[] = $tag;
2311                         }
2312                 }
2313
2314                 $keywords = implode(", ", $keywords);
2315
2316                 $handle_parts = explode("@", $author);
2317                 $nick = $handle_parts[0];
2318
2319                 if ($name === "") {
2320                         $name = $handle_parts[0];
2321                 }
2322
2323                 if (preg_match("|^https?://|", $image_url) === 0) {
2324                         $image_url = "http://".$handle_parts[1].$image_url;
2325                 }
2326
2327                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2328
2329                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2330
2331                 $birthday = str_replace("1000", "1901", $birthday);
2332
2333                 if ($birthday != "") {
2334                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2335                 }
2336
2337                 // this is to prevent multiple birthday notifications in a single year
2338                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2339
2340                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2341                         $birthday = $contact["bd"];
2342                 }
2343
2344                 $fields = ['name' => $name, 'location' => $location,
2345                         'name-date' => DateTimeFormat::utcNow(),
2346                         'about' => $about, 'gender' => $gender,
2347                         'addr' => $author, 'nick' => $nick,
2348                         'keywords' => $keywords];
2349
2350                 if (!empty($birthday)) {
2351                         $fields['bd'] = $birthday;
2352                 }
2353
2354                 dba::update('contact', $fields, ['id' => $contact['id']]);
2355
2356                 $gcontact = ["url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
2357                                         "photo" => $image_url, "name" => $name, "location" => $location,
2358                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2359                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2360                                         "hide" => !$searchable, "nsfw" => $nsfw];
2361
2362                 $gcid = GContact::update($gcontact);
2363
2364                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2365
2366                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
2367
2368                 return true;
2369         }
2370
2371         /**
2372          * @brief Processes incoming friend requests
2373          *
2374          * @param array $importer Array of the importer user
2375          * @param array $contact  The contact that send the request
2376          * @return void
2377          */
2378         private static function receiveRequestMakeFriend($importer, $contact)
2379         {
2380                 $a = get_app();
2381
2382                 if ($contact["rel"] == CONTACT_IS_SHARING) {
2383                         dba::update(
2384                                 'contact',
2385                                 ['rel' => CONTACT_IS_FRIEND, 'writable' => true],
2386                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2387                         );
2388                 }
2389         }
2390
2391         /**
2392          * @brief Processes incoming sharing notification
2393          *
2394          * @param array  $importer Array of the importer user
2395          * @param object $data     The message object
2396          *
2397          * @return bool Success
2398          */
2399         private static function receiveContactRequest($importer, $data)
2400         {
2401                 $author = unxmlify($data->author);
2402                 $recipient = unxmlify($data->recipient);
2403
2404                 if (!$author || !$recipient) {
2405                         return false;
2406                 }
2407
2408                 // the current protocol version doesn't know these fields
2409                 // That means that we will assume their existance
2410                 if (isset($data->following)) {
2411                         $following = (unxmlify($data->following) == "true");
2412                 } else {
2413                         $following = true;
2414                 }
2415
2416                 if (isset($data->sharing)) {
2417                         $sharing = (unxmlify($data->sharing) == "true");
2418                 } else {
2419                         $sharing = true;
2420                 }
2421
2422                 $contact = self::contactByHandle($importer["uid"], $author);
2423
2424                 // perhaps we were already sharing with this person. Now they're sharing with us.
2425                 // That makes us friends.
2426                 if ($contact) {
2427                         if ($following) {
2428                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", LOGGER_DEBUG);
2429                                 self::receiveRequestMakeFriend($importer, $contact);
2430
2431                                 // refetch the contact array
2432                                 $contact = self::contactByHandle($importer["uid"], $author);
2433
2434                                 // If we are now friends, we are sending a share message.
2435                                 // Normally we needn't to do so, but the first message could have been vanished.
2436                                 if (in_array($contact["rel"], [CONTACT_IS_FRIEND])) {
2437                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2438                                         if ($u) {
2439                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2440                                                 $ret = self::sendShare($u[0], $contact);
2441                                         }
2442                                 }
2443                                 return true;
2444                         } else {
2445                                 logger("Author ".$author." doesn't want to follow us anymore.", LOGGER_DEBUG);
2446                                 Contact::removeFollower($importer, $contact);
2447                                 return true;
2448                         }
2449                 }
2450
2451                 if (!$following && $sharing && in_array($importer["page-flags"], [PAGE_SOAPBOX, PAGE_NORMAL])) {
2452                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2453                         return false;
2454                 } elseif (!$following && !$sharing) {
2455                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2456                         return false;
2457                 } elseif (!$following && $sharing) {
2458                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2459                 } elseif ($following && $sharing) {
2460                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2461                 } elseif ($following && !$sharing) {
2462                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2463                 }
2464
2465                 $ret = self::personByHandle($author);
2466
2467                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2468                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2469                         return false;
2470                 }
2471
2472                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2473
2474                 $r = q(
2475                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2476                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2477                         intval($importer["uid"]),
2478                         dbesc($ret["network"]),
2479                         dbesc($ret["addr"]),
2480                         DateTimeFormat::utcNow(),
2481                         dbesc($ret["url"]),
2482                         dbesc(normalise_link($ret["url"])),
2483                         dbesc($batch),
2484                         dbesc($ret["name"]),
2485                         dbesc($ret["nick"]),
2486                         dbesc($ret["photo"]),
2487                         dbesc($ret["pubkey"]),
2488                         dbesc($ret["notify"]),
2489                         dbesc($ret["poll"]),
2490                         1,
2491                         2
2492                 );
2493
2494                 // find the contact record we just created
2495
2496                 $contact_record = self::contactByHandle($importer["uid"], $author);
2497
2498                 if (!$contact_record) {
2499                         logger("unable to locate newly created contact record.");
2500                         return;
2501                 }
2502
2503                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2504
2505                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2506
2507                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2508
2509                 if (in_array($importer["page-flags"], [PAGE_NORMAL, PAGE_PRVGROUP])) {
2510                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2511
2512                         $hash = random_string().(string)time();   // Generate a confirm_key
2513
2514                         $ret = q(
2515                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2516                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2517                                 intval($importer["uid"]),
2518                                 intval($contact_record["id"]),
2519                                 0,
2520                                 0,
2521                                 dbesc(L10n::t("Sharing notification from Diaspora network")),
2522                                 dbesc($hash),
2523                                 dbesc(DateTimeFormat::utcNow())
2524                         );
2525                 } else {
2526                         // automatic friend approval
2527
2528                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2529
2530                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2531
2532                         // technically they are sharing with us (CONTACT_IS_SHARING),
2533                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2534                         // we are going to change the relationship and make them a follower.
2535
2536                         if (($importer["page-flags"] == PAGE_FREELOVE) && $sharing && $following) {
2537                                 $new_relation = CONTACT_IS_FRIEND;
2538                         } elseif (($importer["page-flags"] == PAGE_FREELOVE) && $sharing) {
2539                                 $new_relation = CONTACT_IS_SHARING;
2540                         } else {
2541                                 $new_relation = CONTACT_IS_FOLLOWER;
2542                         }
2543
2544                         $r = q(
2545                                 "UPDATE `contact` SET `rel` = %d,
2546                                 `name-date` = '%s',
2547                                 `uri-date` = '%s',
2548                                 `blocked` = 0,
2549                                 `pending` = 0,
2550                                 `writable` = 1
2551                                 WHERE `id` = %d
2552                                 ",
2553                                 intval($new_relation),
2554                                 dbesc(DateTimeFormat::utcNow()),
2555                                 dbesc(DateTimeFormat::utcNow()),
2556                                 intval($contact_record["id"])
2557                         );
2558
2559                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2560                         if ($u) {
2561                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2562                                 $ret = self::sendShare($u[0], $contact_record);
2563
2564                                 // Send the profile data, maybe it weren't transmitted before
2565                                 self::sendProfile($importer["uid"], [$contact_record]);
2566                         }
2567                 }
2568
2569                 return true;
2570         }
2571
2572         /**
2573          * @brief Fetches a message with a given guid
2574          *
2575          * @param string $guid        message guid
2576          * @param string $orig_author handle of the original post
2577          * @param string $author      handle of the sharer
2578          *
2579          * @return array The fetched item
2580          */
2581         public static function originalItem($guid, $orig_author)
2582         {
2583                 if (empty($guid)) {
2584                         logger('Empty guid. Quitting.');
2585                         return false;
2586                 }
2587
2588                 // Do we already have this item?
2589                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2590                         'author-name', 'author-link', 'author-avatar'];
2591                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2592                 $item = dba::selectfirst('item', $fields, $condition);
2593
2594                 if (DBM::is_result($item)) {
2595                         logger("reshared message ".$guid." already exists on system.");
2596
2597                         // Maybe it is already a reshared item?
2598                         // Then refetch the content, if it is a reshare from a reshare.
2599                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2600                         if (self::isReshare($item["body"], true)) {
2601                                 $item = [];
2602                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2603                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2604
2605                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2606
2607                                 // Add OEmbed and other information to the body
2608                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2609
2610                                 return $item;
2611                         } else {
2612                                 return $item;
2613                         }
2614                 }
2615
2616                 if (!DBM::is_result($item)) {
2617                         if (empty($orig_author)) {
2618                                 logger('Empty author for guid ' . $guid . '. Quitting.');
2619                                 return false;
2620                         }
2621
2622                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2623                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2624                         $stored = self::storeByGuid($guid, $server);
2625
2626                         if (!$stored) {
2627                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2628                                 logger("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2629                                 $stored = self::storeByGuid($guid, $server);
2630                         }
2631
2632                         if ($stored) {
2633                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2634                                         'author-name', 'author-link', 'author-avatar'];
2635                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2636                                 $item = dba::selectfirst('item', $fields, $condition);
2637
2638                                 if (DBM::is_result($item)) {
2639                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2640                                         if (self::isReshare($item["body"], false)) {
2641                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2642                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2643                                         }
2644
2645                                         return $item;
2646                                 }
2647                         }
2648                 }
2649                 return false;
2650         }
2651
2652         /**
2653          * @brief Processes a reshare message
2654          *
2655          * @param array  $importer Array of the importer user
2656          * @param object $data     The message object
2657          * @param string $xml      The original XML of the message
2658          *
2659          * @return int the message id
2660          */
2661         private static function receiveReshare($importer, $data, $xml)
2662         {
2663                 $author = notags(unxmlify($data->author));
2664                 $guid = notags(unxmlify($data->guid));
2665                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2666                 $root_author = notags(unxmlify($data->root_author));
2667                 $root_guid = notags(unxmlify($data->root_guid));
2668                 /// @todo handle unprocessed property "provider_display_name"
2669                 $public = notags(unxmlify($data->public));
2670
2671                 $contact = self::allowedContactByHandle($importer, $author, false);
2672                 if (!$contact) {
2673                         return false;
2674                 }
2675
2676                 $message_id = self::messageExists($importer["uid"], $guid);
2677                 if ($message_id) {
2678                         return true;
2679                 }
2680
2681                 $original_item = self::originalItem($root_guid, $root_author);
2682                 if (!$original_item) {
2683                         return false;
2684                 }
2685
2686                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2687
2688                 $datarray = [];
2689
2690                 $datarray["uid"] = $importer["uid"];
2691                 $datarray["contact-id"] = $contact["id"];
2692                 $datarray["network"]  = NETWORK_DIASPORA;
2693
2694                 $datarray["author-name"] = $contact["name"];
2695                 $datarray["author-link"] = $contact["url"];
2696                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2697
2698                 $datarray["owner-name"] = $datarray["author-name"];
2699                 $datarray["owner-link"] = $datarray["author-link"];
2700                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2701
2702                 $datarray["guid"] = $guid;
2703                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2704
2705                 $datarray["verb"] = ACTIVITY_POST;
2706                 $datarray["gravity"] = GRAVITY_PARENT;
2707
2708                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2709                 $datarray["source"] = $xml;
2710
2711                 $prefix = share_header(
2712                         $original_item["author-name"],
2713                         $original_item["author-link"],
2714                         $original_item["author-avatar"],
2715                         $original_item["guid"],
2716                         $original_item["created"],
2717                         $orig_url
2718                 );
2719                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2720
2721                 $datarray["tag"] = $original_item["tag"];
2722                 $datarray["app"]  = $original_item["app"];
2723
2724                 $datarray["plink"] = self::plink($author, $guid);
2725                 $datarray["private"] = (($public == "false") ? 1 : 0);
2726                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2727
2728                 $datarray["object-type"] = $original_item["object-type"];
2729
2730                 self::fetchGuid($datarray);
2731                 $message_id = Item::insert($datarray);
2732
2733                 self::sendParticipation($contact, $datarray);
2734
2735                 if ($message_id) {
2736                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2737                         if ($datarray['uid'] == 0) {
2738                                 Item::distribute($message_id);
2739                         }
2740                         return true;
2741                 } else {
2742                         return false;
2743                 }
2744         }
2745
2746         /**
2747          * @brief Processes retractions
2748          *
2749          * @param array  $importer Array of the importer user
2750          * @param array  $contact  The contact of the item owner
2751          * @param object $data     The message object
2752          *
2753          * @return bool success
2754          */
2755         private static function itemRetraction($importer, $contact, $data)
2756         {
2757                 $author = notags(unxmlify($data->author));
2758                 $target_guid = notags(unxmlify($data->target_guid));
2759                 $target_type = notags(unxmlify($data->target_type));
2760
2761                 $person = self::personByHandle($author);
2762                 if (!is_array($person)) {
2763                         logger("unable to find author detail for ".$author);
2764                         return false;
2765                 }
2766
2767                 if (empty($contact["url"])) {
2768                         $contact["url"] = $person["url"];
2769                 }
2770
2771                 // Fetch items that are about to be deleted
2772                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link'];
2773
2774                 // When we receive a public retraction, we delete every item that we find.
2775                 if ($importer['uid'] == 0) {
2776                         $condition = ["`guid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid];
2777                 } else {
2778                         $condition = ["`guid` = ? AND `uid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid, $importer['uid']];
2779                 }
2780                 $r = dba::select('item', $fields, $condition);
2781                 if (!DBM::is_result($r)) {
2782                         logger("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2783                         return false;
2784                 }
2785
2786                 while ($item = dba::fetch($r)) {
2787                         // Fetch the parent item
2788                         $parent = dba::selectFirst('item', ['author-link'], ['id' => $item["parent"]]);
2789
2790                         // Only delete it if the parent author really fits
2791                         if (!link_compare($parent["author-link"], $contact["url"]) && !link_compare($item["author-link"], $contact["url"])) {
2792                                 logger("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2793                                 continue;
2794                         }
2795
2796                         Item::delete(['id' => $item["id"]]);
2797
2798                         logger("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], LOGGER_DEBUG);
2799                 }
2800
2801                 return true;
2802         }
2803
2804         /**
2805          * @brief Receives retraction messages
2806          *
2807          * @param array  $importer Array of the importer user
2808          * @param string $sender   The sender of the message
2809          * @param object $data     The message object
2810          *
2811          * @return bool Success
2812          */
2813         private static function receiveRetraction($importer, $sender, $data)
2814         {
2815                 $target_type = notags(unxmlify($data->target_type));
2816
2817                 $contact = self::contactByHandle($importer["uid"], $sender);
2818                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2819                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2820                         return false;
2821                 }
2822
2823                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2824
2825                 switch ($target_type) {
2826                         case "Comment":
2827                         case "Like":
2828                         case "Post":
2829                         case "Reshare":
2830                         case "StatusMessage":
2831                                 return self::itemRetraction($importer, $contact, $data);
2832
2833                         case "PollParticipation":
2834                         case "Photo":
2835                                 // Currently unsupported
2836                                 break;
2837
2838                         default:
2839                                 logger("Unknown target type ".$target_type);
2840                                 return false;
2841                 }
2842                 return true;
2843         }
2844
2845         /**
2846          * @brief Receives status messages
2847          *
2848          * @param array  $importer Array of the importer user
2849          * @param object $data     The message object
2850          * @param string $xml      The original XML of the message
2851          *
2852          * @return int The message id of the newly created item
2853          */
2854         private static function receiveStatusMessage($importer, $data, $xml)
2855         {
2856                 $author = notags(unxmlify($data->author));
2857                 $guid = notags(unxmlify($data->guid));
2858                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2859                 $public = notags(unxmlify($data->public));
2860                 $text = unxmlify($data->text);
2861                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2862
2863                 $contact = self::allowedContactByHandle($importer, $author, false);
2864                 if (!$contact) {
2865                         return false;
2866                 }
2867
2868                 $message_id = self::messageExists($importer["uid"], $guid);
2869                 if ($message_id) {
2870                         return true;
2871                 }
2872
2873                 $address = [];
2874                 if ($data->location) {
2875                         foreach ($data->location->children() as $fieldname => $data) {
2876                                 $address[$fieldname] = notags(unxmlify($data));
2877                         }
2878                 }
2879
2880                 $body = Markdown::toBBCode($text);
2881
2882                 $datarray = [];
2883
2884                 // Attach embedded pictures to the body
2885                 if ($data->photo) {
2886                         foreach ($data->photo as $photo) {
2887                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2888                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2889                         }
2890
2891                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2892                 } else {
2893                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2894
2895                         // Add OEmbed and other information to the body
2896                         if (!self::isRedmatrix($contact["url"])) {
2897                                 $body = add_page_info_to_body($body, false, true);
2898                         }
2899                 }
2900
2901                 /// @todo enable support for polls
2902                 //if ($data->poll) {
2903                 //      foreach ($data->poll AS $poll)
2904                 //              print_r($poll);
2905                 //      die("poll!\n");
2906                 //}
2907
2908                 /// @todo enable support for events
2909
2910                 $datarray["uid"] = $importer["uid"];
2911                 $datarray["contact-id"] = $contact["id"];
2912                 $datarray["network"] = NETWORK_DIASPORA;
2913
2914                 $datarray["author-name"] = $contact["name"];
2915                 $datarray["author-link"] = $contact["url"];
2916                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2917
2918                 $datarray["owner-name"] = $datarray["author-name"];
2919                 $datarray["owner-link"] = $datarray["author-link"];
2920                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2921
2922                 $datarray["guid"] = $guid;
2923                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2924
2925                 $datarray["verb"] = ACTIVITY_POST;
2926                 $datarray["gravity"] = GRAVITY_PARENT;
2927
2928                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2929                 $datarray["source"] = $xml;
2930
2931                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2932
2933                 if ($provider_display_name != "") {
2934                         $datarray["app"] = $provider_display_name;
2935                 }
2936
2937                 $datarray["plink"] = self::plink($author, $guid);
2938                 $datarray["private"] = (($public == "false") ? 1 : 0);
2939                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2940
2941                 if (isset($address["address"])) {
2942                         $datarray["location"] = $address["address"];
2943                 }
2944
2945                 if (isset($address["lat"]) && isset($address["lng"])) {
2946                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2947                 }
2948
2949                 self::fetchGuid($datarray);
2950                 $message_id = Item::insert($datarray);
2951
2952                 self::sendParticipation($contact, $datarray);
2953
2954                 if ($message_id) {
2955                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2956                         if ($datarray['uid'] == 0) {
2957                                 Item::distribute($message_id);
2958                         }
2959                         return true;
2960                 } else {
2961                         return false;
2962                 }
2963         }
2964
2965         /* ************************************************************************************** *
2966          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2967          * ************************************************************************************** */
2968
2969         /**
2970          * @brief returnes the handle of a contact
2971          *
2972          * @param array $contact contact array
2973          *
2974          * @return string the handle in the format user@domain.tld
2975          */
2976         private static function myHandle($contact)
2977         {
2978                 if ($contact["addr"] != "") {
2979                         return $contact["addr"];
2980                 }
2981
2982                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2983                 // So - just in case - we build the the address here.
2984                 if ($contact["nickname"] != "") {
2985                         $nick = $contact["nickname"];
2986                 } else {
2987                         $nick = $contact["nick"];
2988                 }
2989
2990                 return $nick."@".substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
2991         }
2992
2993
2994         /**
2995          * @brief Creates the data for a private message in the new format
2996          *
2997          * @param string $msg     The message that is to be transmitted
2998          * @param array  $user    The record of the sender
2999          * @param array  $contact Target of the communication
3000          * @param string $prvkey  The private key of the sender
3001          * @param string $pubkey  The public key of the receiver
3002          *
3003          * @return string The encrypted data
3004          */
3005         public static function encodePrivateData($msg, $user, $contact, $prvkey, $pubkey)
3006         {
3007                 logger("Message: ".$msg, LOGGER_DATA);
3008
3009                 // without a public key nothing will work
3010                 if (!$pubkey) {
3011                         logger("pubkey missing: contact id: ".$contact["id"]);
3012                         return false;
3013                 }
3014
3015                 $aes_key = openssl_random_pseudo_bytes(32);
3016                 $b_aes_key = base64_encode($aes_key);
3017                 $iv = openssl_random_pseudo_bytes(16);
3018                 $b_iv = base64_encode($iv);
3019
3020                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3021
3022                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3023
3024                 $encrypted_key_bundle = "";
3025                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3026
3027                 $json_object = json_encode(
3028                         ["aes_key" => base64_encode($encrypted_key_bundle),
3029                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3030                 );
3031
3032                 return $json_object;
3033         }
3034
3035         /**
3036          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3037          *
3038          * @param string $msg  The message that is to be transmitted
3039          * @param array  $user The record of the sender
3040          *
3041          * @return string The envelope
3042          */
3043         public static function buildMagicEnvelope($msg, $user)
3044         {
3045                 $b64url_data = base64url_encode($msg);
3046                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3047
3048                 $key_id = base64url_encode(self::myHandle($user));
3049                 $type = "application/xml";
3050                 $encoding = "base64url";
3051                 $alg = "RSA-SHA256";
3052                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
3053
3054                 // Fallback if the private key wasn't transmitted in the expected field
3055                 if ($user['uprvkey'] == "") {
3056                         $user['uprvkey'] = $user['prvkey'];
3057                 }
3058
3059                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3060                 $sig = base64url_encode($signature);
3061
3062                 $xmldata = ["me:env" => ["me:data" => $data,
3063                                                         "@attributes" => ["type" => $type],
3064                                                         "me:encoding" => $encoding,
3065                                                         "me:alg" => $alg,
3066                                                         "me:sig" => $sig,
3067                                                         "@attributes2" => ["key_id" => $key_id]]];
3068
3069                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3070
3071                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3072         }
3073
3074         /**
3075          * @brief Create the envelope for a message
3076          *
3077          * @param string $msg     The message that is to be transmitted
3078          * @param array  $user    The record of the sender
3079          * @param array  $contact Target of the communication
3080          * @param string $prvkey  The private key of the sender
3081          * @param string $pubkey  The public key of the receiver
3082          * @param bool   $public  Is the message public?
3083          *
3084          * @return string The message that will be transmitted to other servers
3085          */
3086         public static function buildMessage($msg, $user, $contact, $prvkey, $pubkey, $public = false)
3087         {
3088                 // The message is put into an envelope with the sender's signature
3089                 $envelope = self::buildMagicEnvelope($msg, $user);
3090
3091                 // Private messages are put into a second envelope, encrypted with the receivers public key
3092                 if (!$public) {
3093                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3094                 }
3095
3096                 return $envelope;
3097         }
3098
3099         /**
3100          * @brief Creates a signature for a message
3101          *
3102          * @param array $owner   the array of the owner of the message
3103          * @param array $message The message that is to be signed
3104          *
3105          * @return string The signature
3106          */
3107         private static function signature($owner, $message)
3108         {
3109                 $sigmsg = $message;
3110                 unset($sigmsg["author_signature"]);
3111                 unset($sigmsg["parent_author_signature"]);
3112
3113                 $signed_text = implode(";", $sigmsg);
3114
3115                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3116         }
3117
3118         /**
3119          * @brief Transmit a message to a target server
3120          *
3121          * @param array  $owner        the array of the item owner
3122          * @param array  $contact      Target of the communication
3123          * @param string $envelope     The message that is to be transmitted
3124          * @param bool   $public_batch Is it a public post?
3125          * @param bool   $queue_run    Is the transmission called from the queue?
3126          * @param string $guid         message guid
3127          *
3128          * @return int Result of the transmission
3129          */
3130         public static function transmit($owner, $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
3131         {
3132                 $a = get_app();
3133
3134                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3135                 if (!$enabled) {
3136                         return 200;
3137                 }
3138
3139                 $logid = random_string(4);
3140
3141                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3142
3143                 // We always try to use the data from the fcontact table.
3144                 // This is important for transmitting data to Friendica servers.
3145                 if (!empty($contact['addr'])) {
3146                         $fcontact = self::personByHandle($contact['addr']);
3147                         if (!empty($fcontact)) {
3148                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3149                         }
3150                 }
3151
3152                 if (!$dest_url) {
3153                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3154                         return 0;
3155                 }
3156
3157                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
3158
3159                 if (!$queue_run && Queue::wasDelayed($contact["id"])) {
3160                         $return_code = 0;
3161                 } else {
3162                         if (!intval(Config::get("system", "diaspora_test"))) {
3163                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3164
3165                                 Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3166                                 $return_code = $a->get_curl_code();
3167                         } else {
3168                                 logger("test_mode");
3169                                 return 200;
3170                         }
3171                 }
3172
3173                 logger("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3174
3175                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
3176                         if (!$no_queue && ($contact['contact-type'] != ACCOUNT_TYPE_RELAY)) {
3177                                 logger("queue message");
3178                                 // queue message for redelivery
3179                                 Queue::add($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3180                         }
3181
3182                         // The message could not be delivered. We mark the contact as "dead"
3183                         Contact::markForArchival($contact);
3184                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3185                         // We successfully delivered a message, the contact is alive
3186                         Contact::unmarkForArchival($contact);
3187                 }
3188
3189                 return $return_code ? $return_code : -1;
3190         }
3191
3192
3193         /**
3194          * @brief Build the post xml
3195          *
3196          * @param string $type    The message type
3197          * @param array  $message The message data
3198          *
3199          * @return string The post XML
3200          */
3201         public static function buildPostXml($type, $message)
3202         {
3203                 $data = [$type => $message];
3204
3205                 return XML::fromArray($data, $xml);
3206         }
3207
3208         /**
3209          * @brief Builds and transmit messages
3210          *
3211          * @param array  $owner        the array of the item owner
3212          * @param array  $contact      Target of the communication
3213          * @param string $type         The message type
3214          * @param array  $message      The message data
3215          * @param bool   $public_batch Is it a public post?
3216          * @param string $guid         message guid
3217          * @param bool   $spool        Should the transmission be spooled or transmitted?
3218          *
3219          * @return int Result of the transmission
3220          */
3221         private static function buildAndTransmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3222         {
3223                 $msg = self::buildPostXml($type, $message);
3224
3225                 logger('message: '.$msg, LOGGER_DATA);
3226                 logger('send guid '.$guid, LOGGER_DEBUG);
3227
3228                 // Fallback if the private key wasn't transmitted in the expected field
3229                 if ($owner['uprvkey'] == "") {
3230                         $owner['uprvkey'] = $owner['prvkey'];
3231                 }
3232
3233                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3234
3235                 if ($spool) {
3236                         Queue::add($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3237                         return true;
3238                 } else {
3239                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3240                 }
3241
3242                 logger("guid: ".$guid." result ".$return_code, LOGGER_DEBUG);
3243
3244                 return $return_code;
3245         }
3246
3247         /**
3248          * @brief sends a participation (Used to get all further updates)
3249          *
3250          * @param array $contact Target of the communication
3251          * @param array $item    Item array
3252          *
3253          * @return int The result of the transmission
3254          */
3255         private static function sendParticipation($contact, $item)
3256         {
3257                 // Don't send notifications for private postings
3258                 if ($item['private']) {
3259                         return;
3260                 }
3261
3262                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3263
3264                 $result = Cache::get($cachekey);
3265                 if (!is_null($result)) {
3266                         return;
3267                 }
3268
3269                 // Fetch some user id to have a valid handle to transmit the participation.
3270                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3271                 // If the item belongs to a user, we take this user id.
3272                 if ($item['uid'] == 0) {
3273                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3274                         $first_user = dba::selectFirst('user', ['uid'], $condition);
3275                         $owner = User::getOwnerDataById($first_user['uid']);
3276                 } else {
3277                         $owner = User::getOwnerDataById($item['uid']);
3278                 }
3279
3280                 $author = self::myHandle($owner);
3281
3282                 $message = ["author" => $author,
3283                                 "guid" => get_guid(32),
3284                                 "parent_type" => "Post",
3285                                 "parent_guid" => $item["guid"]];
3286
3287                 logger("Send participation for ".$item["guid"]." by ".$author, LOGGER_DEBUG);
3288
3289                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3290                 Cache::set($cachekey, $item["guid"], CACHE_QUARTER_HOUR);
3291
3292                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3293         }
3294
3295         /**
3296          * @brief sends an account migration
3297          *
3298          * @param array $owner   the array of the item owner
3299          * @param array $contact Target of the communication
3300          * @param int   $uid     User ID
3301          *
3302          * @return int The result of the transmission
3303          */
3304         public static function sendAccountMigration($owner, $contact, $uid)
3305         {
3306                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3307                 $profile = self::createProfileData($uid);
3308
3309                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3310                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3311
3312                 $message = ["author" => $old_handle,
3313                                 "profile" => $profile,
3314                                 "signature" => $signature];
3315
3316                 logger("Send account migration ".print_r($message, true), LOGGER_DEBUG);
3317
3318                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3319         }
3320
3321         /**
3322          * @brief Sends a "share" message
3323          *
3324          * @param array $owner   the array of the item owner
3325          * @param array $contact Target of the communication
3326          *
3327          * @return int The result of the transmission
3328          */
3329         public static function sendShare($owner, $contact)
3330         {
3331                 /**
3332                  * @todo support the different possible combinations of "following" and "sharing"
3333                  * Currently, Diaspora only interprets the "sharing" field
3334                  *
3335                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3336                  */
3337
3338                 /*
3339                 switch ($contact["rel"]) {
3340                         case CONTACT_IS_FRIEND:
3341                                 $following = true;
3342                                 $sharing = true;
3343                         case CONTACT_IS_SHARING:
3344                                 $following = false;
3345                                 $sharing = true;
3346                         case CONTACT_IS_FOLLOWER:
3347                                 $following = true;
3348                                 $sharing = false;
3349                 }
3350                 */
3351
3352                 $message = ["author" => self::myHandle($owner),
3353                                 "recipient" => $contact["addr"],
3354                                 "following" => "true",
3355                                 "sharing" => "true"];
3356
3357                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
3358
3359                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3360         }
3361
3362         /**
3363          * @brief sends an "unshare"
3364          *
3365          * @param array $owner   the array of the item owner
3366          * @param array $contact Target of the communication
3367          *
3368          * @return int The result of the transmission
3369          */
3370         public static function sendUnshare($owner, $contact)
3371         {
3372                 $message = ["author" => self::myHandle($owner),
3373                                 "recipient" => $contact["addr"],
3374                                 "following" => "false",
3375                                 "sharing" => "false"];
3376
3377                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
3378
3379                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3380         }
3381
3382         /**
3383          * @brief Checks a message body if it is a reshare
3384          *
3385          * @param string $body     The message body that is to be check
3386          * @param bool   $complete Should it be a complete check or a simple check?
3387          *
3388          * @return array|bool Reshare details or "false" if no reshare
3389          */
3390         public static function isReshare($body, $complete = true)
3391         {
3392                 $body = trim($body);
3393
3394                 // Skip if it isn't a pure repeated messages
3395                 // Does it start with a share?
3396                 if ((strpos($body, "[share") > 0) && $complete) {
3397                         return false;
3398                 }
3399
3400                 // Does it end with a share?
3401                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3402                         return false;
3403                 }
3404
3405                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3406                 // Skip if there is no shared message in there
3407                 if ($body == $attributes) {
3408                         return false;
3409                 }
3410
3411                 // If we don't do the complete check we quit here
3412
3413                 $guid = "";
3414                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3415                 if ($matches[1] != "") {
3416                         $guid = $matches[1];
3417                 }
3418
3419                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3420                 if ($matches[1] != "") {
3421                         $guid = $matches[1];
3422                 }
3423
3424                 if (($guid != "") && $complete) {
3425                         $condition = ['guid' => $guid, 'network' => [NETWORK_DFRN, NETWORK_DIASPORA]];
3426                         $item = dba::selectFirst('item', ['contact-id'], $condition);
3427                         if (DBM::is_result($item)) {
3428                                 $ret= [];
3429                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3430                                 $ret["root_guid"] = $guid;
3431                                 return $ret;
3432                         } elseif ($complete) {
3433                                 // We are resharing something that isn't a DFRN or Diaspora post.
3434                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3435                                 return false;
3436                         }
3437                 } elseif (($guid == "") && $complete) {
3438                         return false;
3439                 }
3440
3441                 $ret["root_guid"] = $guid;
3442
3443                 $profile = "";
3444                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3445                 if ($matches[1] != "") {
3446                         $profile = $matches[1];
3447                 }
3448
3449                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3450                 if ($matches[1] != "") {
3451                         $profile = $matches[1];
3452                 }
3453
3454                 $ret= [];
3455
3456                 if ($profile != "") {
3457                         if (Contact::getIdForURL($profile)) {
3458                                 $author = Contact::getDetailsByURL($profile);
3459                                 $ret["root_handle"] = $author['addr'];
3460                         }
3461                 }
3462
3463                 if (empty($ret) && !$complete) {
3464                         return true;
3465                 }
3466
3467                 return $ret;
3468         }
3469
3470         /**
3471          * @brief Create an event array
3472          *
3473          * @param integer $event_id The id of the event
3474          *
3475          * @return array with event data
3476          */
3477         private static function buildEvent($event_id)
3478         {
3479                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3480                 if (!DBM::is_result($r)) {
3481                         return [];
3482                 }
3483
3484                 $event = $r[0];
3485
3486                 $eventdata = [];
3487
3488                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3489                 if (!DBM::is_result($r)) {
3490                         return [];
3491                 }
3492
3493                 $user = $r[0];
3494
3495                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3496                 if (!DBM::is_result($r)) {
3497                         return [];
3498                 }
3499
3500                 $owner = $r[0];
3501
3502                 $eventdata['author'] = self::myHandle($owner);
3503
3504                 if ($event['guid']) {
3505                         $eventdata['guid'] = $event['guid'];
3506                 }
3507
3508                 $mask = DateTimeFormat::ATOM;
3509
3510                 /// @todo - establish "all day" events in Friendica
3511                 $eventdata["all_day"] = "false";
3512
3513                 if (!$event['adjust']) {
3514                         $eventdata['timezone'] = $user['timezone'];
3515
3516                         if ($eventdata['timezone'] == "") {
3517                                 $eventdata['timezone'] = 'UTC';
3518                         }
3519                 }
3520
3521                 if ($event['start']) {
3522                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3523                 }
3524                 if ($event['finish'] && !$event['nofinish']) {
3525                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3526                 }
3527                 if ($event['summary']) {
3528                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3529                 }
3530                 if ($event['desc']) {
3531                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3532                 }
3533                 if ($event['location']) {
3534                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3535                         $coord = Map::getCoordinates($event['location']);
3536
3537                         $location = [];
3538                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3539                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3540                                 $location["lat"] = $coord['lat'];
3541                                 $location["lng"] = $coord['lon'];
3542                         } else {
3543                                 $location["lat"] = 0;
3544                                 $location["lng"] = 0;
3545                         }
3546                         $eventdata['location'] = $location;
3547                 }
3548
3549                 return $eventdata;
3550         }
3551
3552         /**
3553          * @brief Create a post (status message or reshare)
3554          *
3555          * @param array $item  The item that will be exported
3556          * @param array $owner the array of the item owner
3557          *
3558          * @return array
3559          * 'type' -> Message type ("status_message" or "reshare")
3560          * 'message' -> Array of XML elements of the status
3561          */
3562         public static function buildStatus($item, $owner)
3563         {
3564                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3565
3566                 $result = Cache::get($cachekey);
3567                 if (!is_null($result)) {
3568                         return $result;
3569                 }
3570
3571                 $myaddr = self::myHandle($owner);
3572
3573                 $public = (($item["private"]) ? "false" : "true");
3574
3575                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3576
3577                 // Detect a share element and do a reshare
3578                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3579                         $message = ["author" => $myaddr,
3580                                         "guid" => $item["guid"],
3581                                         "created_at" => $created,
3582                                         "root_author" => $ret["root_handle"],
3583                                         "root_guid" => $ret["root_guid"],
3584                                         "provider_display_name" => $item["app"],
3585                                         "public" => $public];
3586
3587                         $type = "reshare";
3588                 } else {
3589                         $title = $item["title"];
3590                         $body = $item["body"];
3591
3592                         if ($item['author-link'] != $item['owner-link']) {
3593                                 require_once 'mod/share.php';
3594                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3595                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3596                         }
3597
3598                         // convert to markdown
3599                         $body = html_entity_decode(BBCode::toMarkdown($body));
3600
3601                         // Adding the title
3602                         if (strlen($title)) {
3603                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3604                         }
3605
3606                         if ($item["attach"]) {
3607                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3608                                 if (cnt) {
3609                                         $body .= "\n".L10n::t("Attachments:")."\n";
3610                                         foreach ($matches as $mtch) {
3611                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3612                                         }
3613                                 }
3614                         }
3615
3616                         $location = [];
3617
3618                         if ($item["location"] != "")
3619                                 $location["address"] = $item["location"];
3620
3621                         if ($item["coord"] != "") {
3622                                 $coord = explode(" ", $item["coord"]);
3623                                 $location["lat"] = $coord[0];
3624                                 $location["lng"] = $coord[1];
3625                         }
3626
3627                         $message = ["author" => $myaddr,
3628                                         "guid" => $item["guid"],
3629                                         "created_at" => $created,
3630                                         "public" => $public,
3631                                         "text" => $body,
3632                                         "provider_display_name" => $item["app"],
3633                                         "location" => $location];
3634
3635                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3636                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3637                                 unset($message["location"]);
3638                         }
3639
3640                         if ($item['event-id'] > 0) {
3641                                 $event = self::buildEvent($item['event-id']);
3642                                 if (count($event)) {
3643                                         $message['event'] = $event;
3644
3645                                         if (!empty($event['location']['address']) &&
3646                                                 !empty($event['location']['lat']) &&
3647                                                 !empty($event['location']['lng'])) {
3648                                                 $message['location'] = $event['location'];
3649                                         }
3650
3651                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3652                                         // $message['text'] = '';
3653                                 }
3654                         }
3655
3656                         $type = "status_message";
3657                 }
3658
3659                 $msg = ["type" => $type, "message" => $message];
3660
3661                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3662
3663                 return $msg;
3664         }
3665
3666         /**
3667          * @brief Sends a post
3668          *
3669          * @param array $item         The item that will be exported
3670          * @param array $owner        the array of the item owner
3671          * @param array $contact      Target of the communication
3672          * @param bool  $public_batch Is it a public post?
3673          *
3674          * @return int The result of the transmission
3675          */
3676         public static function sendStatus($item, $owner, $contact, $public_batch = false)
3677         {
3678                 $status = self::buildStatus($item, $owner);
3679
3680                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3681         }
3682
3683         /**
3684          * @brief Creates a "like" object
3685          *
3686          * @param array $item  The item that will be exported
3687          * @param array $owner the array of the item owner
3688          *
3689          * @return array The data for a "like"
3690          */
3691         private static function constructLike($item, $owner)
3692         {
3693                 $p = q(
3694                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3695                         dbesc($item["thr-parent"])
3696                 );
3697                 if (!DBM::is_result($p)) {
3698                         return false;
3699                 }
3700
3701                 $parent = $p[0];
3702
3703                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3704                 $positive = null;
3705                 if ($item['verb'] === ACTIVITY_LIKE) {
3706                         $positive = "true";
3707                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3708                         $positive = "false";
3709                 }
3710
3711                 return(["author" => self::myHandle($owner),
3712                                 "guid" => $item["guid"],
3713                                 "parent_guid" => $parent["guid"],
3714                                 "parent_type" => $target_type,
3715                                 "positive" => $positive,
3716                                 "author_signature" => ""]);
3717         }
3718
3719         /**
3720          * @brief Creates an "EventParticipation" object
3721          *
3722          * @param array $item  The item that will be exported
3723          * @param array $owner the array of the item owner
3724          *
3725          * @return array The data for an "EventParticipation"
3726          */
3727         private static function constructAttend($item, $owner)
3728         {
3729                 $p = q(
3730                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3731                         dbesc($item["thr-parent"])
3732                 );
3733                 if (!DBM::is_result($p)) {
3734                         return false;
3735                 }
3736
3737                 $parent = $p[0];
3738
3739                 switch ($item['verb']) {
3740                         case ACTIVITY_ATTEND:
3741                                 $attend_answer = 'accepted';
3742                                 break;
3743                         case ACTIVITY_ATTENDNO:
3744                                 $attend_answer = 'declined';
3745                                 break;
3746                         case ACTIVITY_ATTENDMAYBE:
3747                                 $attend_answer = 'tentative';
3748                                 break;
3749                         default:
3750                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3751                                 return false;
3752                 }
3753
3754                 return(["author" => self::myHandle($owner),
3755                                 "guid" => $item["guid"],
3756                                 "parent_guid" => $parent["guid"],
3757                                 "status" => $attend_answer,
3758                                 "author_signature" => ""]);
3759         }
3760
3761         /**
3762          * @brief Creates the object for a comment
3763          *
3764          * @param array $item  The item that will be exported
3765          * @param array $owner the array of the item owner
3766          *
3767          * @return array The data for a comment
3768          */
3769         private static function constructComment($item, $owner)
3770         {
3771                 $cachekey = "diaspora:constructComment:".$item['guid'];
3772
3773                 $result = Cache::get($cachekey);
3774                 if (!is_null($result)) {
3775                         return $result;
3776                 }
3777
3778                 $p = q(
3779                         "SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3780                         intval($item["parent"]),
3781                         intval($item["parent"])
3782                 );
3783
3784                 if (!DBM::is_result($p)) {
3785                         return false;
3786                 }
3787
3788                 $parent = $p[0];
3789
3790                 $text = html_entity_decode(BBCode::toMarkdown($item["body"]));
3791                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3792
3793                 $comment = ["author" => self::myHandle($owner),
3794                                 "guid" => $item["guid"],
3795                                 "created_at" => $created,
3796                                 "parent_guid" => $parent["guid"],
3797                                 "text" => $text,
3798                                 "author_signature" => ""];
3799
3800                 // Send the thread parent guid only if it is a threaded comment
3801                 if ($item['thr-parent'] != $item['parent-uri']) {
3802                         $comment['thread_parent_guid'] = self::getGuidFromUri($item['thr-parent'], $item['uid']);
3803                 }
3804
3805                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3806
3807                 return($comment);
3808         }
3809
3810         /**
3811          * @brief Send a like or a comment
3812          *
3813          * @param array $item         The item that will be exported
3814          * @param array $owner        the array of the item owner
3815          * @param array $contact      Target of the communication
3816          * @param bool  $public_batch Is it a public post?
3817          *
3818          * @return int The result of the transmission
3819          */
3820         public static function sendFollowup($item, $owner, $contact, $public_batch = false)
3821         {
3822                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3823                         $message = self::constructAttend($item, $owner);
3824                         $type = "event_participation";
3825                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3826                         $message = self::constructLike($item, $owner);
3827                         $type = "like";
3828                 } else {
3829                         $message = self::constructComment($item, $owner);
3830                         $type = "comment";
3831                 }
3832
3833                 if (!$message) {
3834                         return false;
3835                 }
3836
3837                 $message["author_signature"] = self::signature($owner, $message);
3838
3839                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3840         }
3841
3842         /**
3843          * @brief Creates a message from a signature record entry
3844          *
3845          * @param array $item      The item that will be exported
3846          * @param array $signature The entry of the "sign" record
3847          *
3848          * @return string The message
3849          */
3850         private static function messageFromSignature($item, $signature)
3851         {
3852                 // Split the signed text
3853                 $signed_parts = explode(";", $signature['signed_text']);
3854
3855                 if ($item["deleted"]) {
3856                         $message = ["author" => $signature['signer'],
3857                                         "target_guid" => $signed_parts[0],
3858                                         "target_type" => $signed_parts[1]];
3859                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3860                         $message = ["author" => $signed_parts[4],
3861                                         "guid" => $signed_parts[1],
3862                                         "parent_guid" => $signed_parts[3],
3863                                         "parent_type" => $signed_parts[2],
3864                                         "positive" => $signed_parts[0],
3865                                         "author_signature" => $signature['signature'],
3866                                         "parent_author_signature" => ""];
3867                 } else {
3868                         // Remove the comment guid
3869                         $guid = array_shift($signed_parts);
3870
3871                         // Remove the parent guid
3872                         $parent_guid = array_shift($signed_parts);
3873
3874                         // Remove the handle
3875                         $handle = array_pop($signed_parts);
3876
3877                         // Glue the parts together
3878                         $text = implode(";", $signed_parts);
3879
3880                         $message = ["author" => $handle,
3881                                         "guid" => $guid,
3882                                         "parent_guid" => $parent_guid,
3883                                         "text" => implode(";", $signed_parts),
3884                                         "author_signature" => $signature['signature'],
3885                                         "parent_author_signature" => ""];
3886                 }
3887                 return $message;
3888         }
3889
3890         /**
3891          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3892          *
3893          * @param array $item         The item that will be exported
3894          * @param array $owner        the array of the item owner
3895          * @param array $contact      Target of the communication
3896          * @param bool  $public_batch Is it a public post?
3897          *
3898          * @return int The result of the transmission
3899          */
3900         public static function sendRelay($item, $owner, $contact, $public_batch = false)
3901         {
3902                 if ($item["deleted"]) {
3903                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3904                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3905                         $type = "like";
3906                 } else {
3907                         $type = "comment";
3908                 }
3909
3910                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3911
3912                 // fetch the original signature
3913
3914                 $r = q(
3915                         "SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3916                         intval($item["id"])
3917                 );
3918
3919                 if (!$r) {
3920                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3921                         return false;
3922                 }
3923
3924                 $signature = $r[0];
3925
3926                 // Old way - is used by the internal Friendica functions
3927                 /// @todo Change all signatur storing functions to the new format
3928                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer']) {
3929                         $message = self::messageFromSignature($item, $signature);
3930                 } else {// New way
3931                         $msg = json_decode($signature['signed_text'], true);
3932
3933                         $message = [];
3934                         if (is_array($msg)) {
3935                                 foreach ($msg as $field => $data) {
3936                                         if (!$item["deleted"]) {
3937                                                 if ($field == "diaspora_handle") {
3938                                                         $field = "author";
3939                                                 }
3940                                                 if ($field == "target_type") {
3941                                                         $field = "parent_type";
3942                                                 }
3943                                         }
3944
3945                                         $message[$field] = $data;
3946                                 }
3947                         } else {
3948                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3949                         }
3950                 }
3951
3952                 $message["parent_author_signature"] = self::signature($owner, $message);
3953
3954                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3955
3956                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3957         }
3958
3959         /**
3960          * @brief Sends a retraction (deletion) of a message, like or comment
3961          *
3962          * @param array $item         The item that will be exported
3963          * @param array $owner        the array of the item owner
3964          * @param array $contact      Target of the communication
3965          * @param bool  $public_batch Is it a public post?
3966          * @param bool  $relay        Is the retraction transmitted from a relay?
3967          *
3968          * @return int The result of the transmission
3969          */
3970         public static function sendRetraction($item, $owner, $contact, $public_batch = false, $relay = false)
3971         {
3972                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3973
3974                 $msg_type = "retraction";
3975
3976                 if ($item['id'] == $item['parent']) {
3977                         $target_type = "Post";
3978                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3979                         $target_type = "Like";
3980                 } else {
3981                         $target_type = "Comment";
3982                 }
3983
3984                 $message = ["author" => $itemaddr,
3985                                 "target_guid" => $item['guid'],
3986                                 "target_type" => $target_type];
3987
3988                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3989
3990                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3991         }
3992
3993         /**
3994          * @brief Sends a mail
3995          *
3996          * @param array $item    The item that will be exported
3997          * @param array $owner   The owner
3998          * @param array $contact Target of the communication
3999          *
4000          * @return int The result of the transmission
4001          */
4002         public static function sendMail($item, $owner, $contact)
4003         {
4004                 $myaddr = self::myHandle($owner);
4005
4006                 $r = q(
4007                         "SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
4008                         intval($item["convid"]),
4009                         intval($item["uid"])
4010                 );
4011
4012                 if (!DBM::is_result($r)) {
4013                         logger("conversation not found.");
4014                         return;
4015                 }
4016                 $cnv = $r[0];
4017
4018                 $conv = [
4019                         "author" => $cnv["creator"],
4020                         "guid" => $cnv["guid"],
4021                         "subject" => $cnv["subject"],
4022                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4023                         "participants" => $cnv["recips"]
4024                 ];
4025
4026                 $body = BBCode::toMarkdown($item["body"]);
4027                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4028
4029                 $msg = [
4030                         "author" => $myaddr,
4031                         "guid" => $item["guid"],
4032                         "conversation_guid" => $cnv["guid"],
4033                         "text" => $body,
4034                         "created_at" => $created,
4035                 ];
4036
4037                 if ($item["reply"]) {
4038                         $message = $msg;
4039                         $type = "message";
4040                 } else {
4041                         $message = [
4042                                         "author" => $cnv["creator"],
4043                                         "guid" => $cnv["guid"],
4044                                         "subject" => $cnv["subject"],
4045                                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4046                                         "participants" => $cnv["recips"],
4047                                         "message" => $msg];
4048
4049                         $type = "conversation";
4050                 }
4051
4052                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4053         }
4054
4055         /**
4056          * @brief Split a name into first name and last name
4057          *
4058          * @param string $name The name
4059          *
4060          * @return array The array with "first" and "last"
4061          */
4062         public static function splitName($name) {
4063                 $name = trim($name);
4064
4065                 // Is the name longer than 64 characters? Then cut the rest of it.
4066                 if (strlen($name) > 64) {
4067                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4068                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4069                         } else {
4070                                 $name = substr($name, 0, 64);
4071                         }
4072                 }
4073
4074                 // Take the first word as first name
4075                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4076                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4077                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4078                         return ['first' => $first, 'last' => $last];
4079                 }
4080
4081                 // Take the last word as last name
4082                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4083                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4084
4085                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4086                         return ['first' => $first, 'last' => $last];
4087                 }
4088
4089                 // Take the first 32 characters if there is no space in the first 32 characters
4090                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4091                         $first = substr($name, 0, 32);
4092                         $last = substr($name, 32);
4093                         return ['first' => $first, 'last' => $last];
4094                 }
4095
4096                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4097                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4098
4099                 // Check if the last name is longer than 32 characters
4100                 if (strlen($last) > 32) {
4101                         if (strpos($last, ' ') <= 32) {
4102                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4103                         } else {
4104                                 $last = substr($last, 0, 32);
4105                         }
4106                 }
4107
4108                 return ['first' => $first, 'last' => $last];
4109         }
4110
4111         /**
4112          * @brief Create profile data
4113          *
4114          * @param int $uid The user id
4115          *
4116          * @return array The profile data
4117          */
4118         private static function createProfileData($uid)
4119         {
4120                 $r = q(
4121                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4122                         FROM `profile`
4123                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4124                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4125                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4126                         intval($uid)
4127                 );
4128
4129                 if (!$r) {
4130                         return [];
4131                 }
4132
4133                 $profile = $r[0];
4134                 $handle = $profile["addr"];
4135
4136                 $split_name = self::splitName($profile['name']);
4137                 $first = $split_name['first'];
4138                 $last = $split_name['last'];
4139
4140                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4141                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4142                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4143                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4144
4145                 $dob = null;
4146                 $about = null;
4147                 $location = null;
4148                 $tags = null;
4149                 if ($searchable === 'true') {
4150                         $dob = '';
4151
4152                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4153                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4154                                 if ($year < 1004) {
4155                                         $year = 1004;
4156                                 }
4157                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4158                         }
4159
4160                         $about = $profile['about'];
4161                         $about = strip_tags(BBCode::convert($about));
4162
4163                         $location = Profile::formatLocation($profile);
4164                         $tags = '';
4165                         if ($profile['pub_keywords']) {
4166                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4167                                 $kw = str_replace('  ', ' ', $kw);
4168                                 $arr = explode(' ', $profile['pub_keywords']);
4169                                 if (count($arr)) {
4170                                         for ($x = 0; $x < 5; $x ++) {
4171                                                 if (trim($arr[$x])) {
4172                                                         $tags .= '#'. trim($arr[$x]) .' ';
4173                                                 }
4174                                         }
4175                                 }
4176                         }
4177                         $tags = trim($tags);
4178                 }
4179
4180                 return ["author" => $handle,
4181                                 "first_name" => $first,
4182                                 "last_name" => $last,
4183                                 "image_url" => $large,
4184                                 "image_url_medium" => $medium,
4185                                 "image_url_small" => $small,
4186                                 "birthday" => $dob,
4187                                 "gender" => $profile['gender'],
4188                                 "bio" => $about,
4189                                 "location" => $location,
4190                                 "searchable" => $searchable,
4191                                 "nsfw" => "false",
4192                                 "tag_string" => $tags];
4193         }
4194
4195         /**
4196          * @brief Sends profile data
4197          *
4198          * @param int  $uid    The user id
4199          * @param bool $recips optional, default false
4200          * @return void
4201          */
4202         public static function sendProfile($uid, $recips = false)
4203         {
4204                 if (!$uid) {
4205                         return;
4206                 }
4207
4208                 $owner = User::getOwnerDataById($uid);
4209                 if (!$owner) {
4210                         return;
4211                 }
4212
4213                 if (!$recips) {
4214                         $recips = q(
4215                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4216                                 AND `uid` = %d AND `rel` != %d",
4217                                 dbesc(NETWORK_DIASPORA),
4218                                 intval($uid),
4219                                 intval(CONTACT_IS_SHARING)
4220                         );
4221                 }
4222
4223                 if (!$recips) {
4224                         return;
4225                 }
4226
4227                 $message = self::createProfileData($uid);
4228
4229                 foreach ($recips as $recip) {
4230                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
4231                         self::buildAndTransmit($owner, $recip, "profile", $message, false, "", false);
4232                 }
4233         }
4234
4235         /**
4236          * @brief Stores the signature for likes that are created on our system
4237          *
4238          * @param array $contact The contact array of the "like"
4239          * @param int   $post_id The post id of the "like"
4240          *
4241          * @return bool Success
4242          */
4243         public static function storeLikeSignature($contact, $post_id)
4244         {
4245                 // Is the contact the owner? Then fetch the private key
4246                 if (!$contact['self'] || ($contact['uid'] == 0)) {
4247                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
4248                         return false;
4249                 }
4250
4251                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
4252                 if (!DBM::is_result($r)) {
4253                         return false;
4254                 }
4255
4256                 $contact["uprvkey"] = $r[0]['prvkey'];
4257
4258                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
4259                 if (!DBM::is_result($r)) {
4260                         return false;
4261                 }
4262
4263                 if (!in_array($r[0]["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4264                         return false;
4265                 }
4266
4267                 $message = self::constructLike($r[0], $contact);
4268                 if ($message === false) {
4269                         return false;
4270                 }
4271
4272                 $message["author_signature"] = self::signature($contact, $message);
4273
4274                 /*
4275                  * Now store the signature more flexible to dynamically support new fields.
4276                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4277                  */
4278                 dba::insert('sign', ['iid' => $post_id, 'signed_text' => json_encode($message)]);
4279
4280                 logger('Stored diaspora like signature');
4281                 return true;
4282         }
4283
4284         /**
4285          * @brief Stores the signature for comments that are created on our system
4286          *
4287          * @param array  $item       The item array of the comment
4288          * @param array  $contact    The contact array of the item owner
4289          * @param string $uprvkey    The private key of the sender
4290          * @param int    $message_id The message id of the comment
4291          *
4292          * @return bool Success
4293          */
4294         public static function storeCommentSignature($item, $contact, $uprvkey, $message_id)
4295         {
4296                 if ($uprvkey == "") {
4297                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
4298                         return false;
4299                 }
4300
4301                 $contact["uprvkey"] = $uprvkey;
4302
4303                 $message = self::constructComment($item, $contact);
4304                 if ($message === false) {
4305                         return false;
4306                 }
4307
4308                 $message["author_signature"] = self::signature($contact, $message);
4309
4310                 /*
4311                  * Now store the signature more flexible to dynamically support new fields.
4312                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4313                  */
4314                 dba::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($message)]);
4315
4316                 logger('Stored diaspora comment signature');
4317                 return true;
4318         }
4319 }