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\Logger;
  19 use Friendica\Core\PConfig;
  20 use Friendica\Core\Protocol;
  21 use Friendica\Core\System;
  22 use Friendica\Core\Worker;
  23 use Friendica\Database\DBA;
  24 use Friendica\Model\Contact;
  25 use Friendica\Model\Conversation;
  26 use Friendica\Model\GContact;
  27 use Friendica\Model\Group;
  28 use Friendica\Model\Item;
  29 use Friendica\Model\Profile;
  30 use Friendica\Model\Queue;
  31 use Friendica\Model\User;
  32 use Friendica\Network\Probe;
  33 use Friendica\Util\Crypto;
  34 use Friendica\Util\DateTimeFormat;
  35 use Friendica\Util\Map;
  36 use Friendica\Util\Network;
  37 use Friendica\Util\Strings;
  38 use Friendica\Util\XML;
  39 use SimpleXMLElement;
  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, array $contacts = [])
  58         {
  59                 $serverlist = [];
  60
  61                 // Fetching relay servers
  62                 $serverdata = Config::get("system", "relay_server");
  63
  64                 if (!empty($serverdata)) {
  65                         $servers = explode(",", $serverdata);
  66                         foreach ($servers as $server) {
  67                                 $serverlist[$server] = trim($server);
  68                         }
  69                 }
  70
  71                 if (Config::get("system", "relay_directly", false)) {
  72                         // We distribute our stuff based on the parent to ensure that the thread will be complete
  73                         $parent = Item::selectFirst(['parent'], ['id' => $item_id]);
  74                         if (!DBA::isResult($parent)) {
  75                                 return;
  76                         }
  77
  78                         // Servers that want to get all content
  79                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  80                         while ($server = DBA::fetch($servers)) {
  81                                 $serverlist[$server['url']] = $server['url'];
  82                         }
  83
  84                         // All tags of the current post
  85                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
  86                         $tags = DBA::select('term', ['term'], $condition);
  87                         $taglist = [];
  88                         while ($tag = DBA::fetch($tags)) {
  89                                 $taglist[] = $tag['term'];
  90                         }
  91
  92                         // All servers who wants content with this tag
  93                         $tagserverlist = [];
  94                         if (!empty($taglist)) {
  95                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  96                                 while ($server = DBA::fetch($tagserver)) {
  97                                         $tagserverlist[] = $server['gserver-id'];
  98                                 }
  99                         }
 100
 101                         // All adresses with the given id
 102                         if (!empty($tagserverlist)) {
 103                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 104                                 while ($server = DBA::fetch($servers)) {
 105                                         $serverlist[$server['url']] = $server['url'];
 106                                 }
 107                         }
 108                 }
 109
 110                 // Now we are collecting all relay contacts
 111                 foreach ($serverlist as $server_url) {
 112                         // We don't send messages to ourselves
 113                         if (Strings::compareLink($server_url, System::baseUrl())) {
 114                                 continue;
 115                         }
 116                         $contact = self::getRelayContact($server_url);
 117                         if (is_bool($contact)) {
 118                                 continue;
 119                         }
 120
 121                         $exists = false;
 122                         foreach ($contacts as $entry) {
 123                                 if ($entry['batch'] == $contact['batch']) {
 124                                         $exists = true;
 125                                 }
 126                         }
 127
 128                         if (!$exists) {
 129                                 $contacts[] = $contact;
 130                         }
 131                 }
 132
 133                 return $contacts;
 134         }
 135
 136         /**
 137          * @brief Return a contact for a given server address or creates a dummy entry
 138          *
 139          * @param string $server_url The url of the server
 140          * @return array with the contact
 141          */
 142         private static function getRelayContact($server_url)
 143         {
 144                 $fields = ['batch', 'id', 'name', 'network', 'archive', 'blocked'];
 145
 146                 // Fetch the relay contact
 147                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 148                         'contact-type' => Contact::ACCOUNT_TYPE_RELAY];
 149                 $contact = DBA::selectFirst('contact', $fields, $condition);
 150
 151                 if (DBA::isResult($contact)) {
 152                         if ($contact['archive'] || $contact['blocked']) {
 153                                 return false;
 154                         }
 155                         return $contact;
 156                 } else {
 157                         self::setRelayContact($server_url);
 158
 159                         $contact = DBA::selectFirst('contact', $fields, $condition);
 160                         if (DBA::isResult($contact)) {
 161                                 return $contact;
 162                         }
 163                 }
 164
 165                 // It should never happen that we arrive here
 166                 return [];
 167         }
 168
 169         /**
 170          * @brief Update or insert a relay contact
 171          *
 172          * @param string $server_url The url of the server
 173          * @param array $network_fields Optional network specific fields
 174          */
 175         public static function setRelayContact($server_url, array $network_fields = [])
 176         {
 177                 $fields = ['created' => DateTimeFormat::utcNow(),
 178                         'name' => 'relay', 'nick' => 'relay',
 179                         'url' => $server_url, 'network' => Protocol::DIASPORA,
 180                         'batch' => $server_url . '/receive/public',
 181                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 182                         'pending' => false, 'writable' => true];
 183
 184                 $fields = array_merge($fields, $network_fields);
 185
 186                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 187                         'contact-type' => Contact::ACCOUNT_TYPE_RELAY];
 188
 189                 if (DBA::exists('contact', $condition)) {
 190                         unset($fields['created']);
 191                 }
 192
 193                 DBA::update('contact', $fields, $condition, true);
 194         }
 195
 196         /**
 197          * @brief Return a list of participating contacts for a thread
 198          *
 199          * This is used for the participation feature.
 200          * One of the parameters is a contact array.
 201          * This is done to avoid duplicates.
 202          *
 203          * @param integer $thread   The id of the thread
 204          * @param array   $contacts The previously fetched contacts
 205          *
 206          * @return array of relay servers
 207          */
 208         public static function participantsForThread($thread, array $contacts)
 209         {
 210                 $r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
 211                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 212                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 213                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 214                                 WHERE `participation`.`iid` = ?", $thread);
 215
 216                 while ($contact = DBA::fetch($r)) {
 217                         if (!empty($contact['fnetwork'])) {
 218                                 $contact['network'] = $contact['fnetwork'];
 219                         }
 220                         unset($contact['fnetwork']);
 221
 222                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 223                                 $contact['batch'] = $contact['fbatch'];
 224                         }
 225                         unset($contact['fbatch']);
 226
 227                         $exists = false;
 228                         foreach ($contacts as $entry) {
 229                                 if ($entry['batch'] == $contact['batch']) {
 230                                         $exists = true;
 231                                 }
 232                         }
 233
 234                         if (!$exists) {
 235                                 $contacts[] = $contact;
 236                         }
 237                 }
 238                 DBA::close($r);
 239
 240                 return $contacts;
 241         }
 242
 243         /**
 244          * @brief repairs a signature that was double encoded
 245          *
 246          * The function is unused at the moment. It was copied from the old implementation.
 247          *
 248          * @param string  $signature The signature
 249          * @param string  $handle    The handle of the signature owner
 250          * @param integer $level     This value is only set inside this function to avoid endless loops
 251          *
 252          * @return string the repaired signature
 253          */
 254         private static function repairSignature($signature, $handle = "", $level = 1)
 255         {
 256                 if ($signature == "") {
 257                         return ($signature);
 258                 }
 259
 260                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 261                         $signature = base64_decode($signature);
 262                         Logger::log("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, Logger::DEBUG);
 263
 264                         // Do a recursive call to be able to fix even multiple levels
 265                         if ($level < 10) {
 266                                 $signature = self::repairSignature($signature, $handle, ++$level);
 267                         }
 268                 }
 269
 270                 return($signature);
 271         }
 272
 273         /**
 274          * @brief verify the envelope and return the verified data
 275          *
 276          * @param string $envelope The magic envelope
 277          *
 278          * @return string verified data
 279          */
 280         private static function verifyMagicEnvelope($envelope)
 281         {
 282                 $basedom = XML::parseString($envelope);
 283
 284                 if (!is_object($basedom)) {
 285                         Logger::log("Envelope is no XML file");
 286                         return false;
 287                 }
 288
 289                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 290
 291                 if (sizeof($children) == 0) {
 292                         Logger::log("XML has no children");
 293                         return false;
 294                 }
 295
 296                 $handle = "";
 297
 298                 $data = Strings::base64UrlDecode($children->data);
 299                 $type = $children->data->attributes()->type[0];
 300
 301                 $encoding = $children->encoding;
 302
 303                 $alg = $children->alg;
 304
 305                 $sig = Strings::base64UrlDecode($children->sig);
 306                 $key_id = $children->sig->attributes()->key_id[0];
 307                 if ($key_id != "") {
 308                         $handle = Strings::base64UrlDecode($key_id);
 309                 }
 310
 311                 $b64url_data = Strings::base64UrlEncode($data);
 312                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 313
 314                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 315
 316                 if ($handle == '') {
 317                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 318                         return false;
 319                 }
 320
 321                 $key = self::key($handle);
 322                 if ($key == '') {
 323                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 324                         return false;
 325                 }
 326
 327                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 328                 if (!$verify) {
 329                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 330                         return false;
 331                 }
 332
 333                 return $data;
 334         }
 335
 336         /**
 337          * @brief encrypts data via AES
 338          *
 339          * @param string $key  The AES key
 340          * @param string $iv   The IV (is used for CBC encoding)
 341          * @param string $data The data that is to be encrypted
 342          *
 343          * @return string encrypted data
 344          */
 345         private static function aesEncrypt($key, $iv, $data)
 346         {
 347                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 348         }
 349
 350         /**
 351          * @brief decrypts data via AES
 352          *
 353          * @param string $key       The AES key
 354          * @param string $iv        The IV (is used for CBC encoding)
 355          * @param string $encrypted The encrypted data
 356          *
 357          * @return string decrypted data
 358          */
 359         private static function aesDecrypt($key, $iv, $encrypted)
 360         {
 361                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 362         }
 363
 364         /**
 365          * @brief: Decodes incoming Diaspora message in the new format
 366          *
 367          * @param array   $importer Array of the importer user
 368          * @param string  $raw      raw post message
 369          * @param boolean $no_exit  Don't do an http exit on error
 370          *
 371          * @return array
 372          * 'message' -> decoded Diaspora XML message
 373          * 'author' -> author diaspora handle
 374          * 'key' -> author public key (converted to pkcs#8)
 375          */
 376         public static function decodeRaw(array $importer, $raw, $no_exit = false)
 377         {
 378                 $data = json_decode($raw);
 379
 380                 // Is it a private post? Then decrypt the outer Salmon
 381                 if (is_object($data)) {
 382                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 383                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 384
 385                         $outer_key_bundle = '';
 386                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 387                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 388
 389                         if (!is_object($j_outer_key_bundle)) {
 390                                 Logger::log('Outer Salmon did not verify. Discarding.');
 391                                 if ($no_exit) {
 392                                         return false;
 393                                 } else {
 394                                         System::httpExit(400);
 395                                 }
 396                         }
 397
 398                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 399                         $outer_key = base64_decode($j_outer_key_bundle->key);
 400
 401                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 402                 } else {
 403                         $xml = $raw;
 404                 }
 405
 406                 $basedom = XML::parseString($xml);
 407
 408                 if (!is_object($basedom)) {
 409                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 410                         if ($no_exit) {
 411                                 return false;
 412                         } else {
 413                                 System::httpExit(400);
 414                         }
 415                 }
 416
 417                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 418
 419                 // Not sure if this cleaning is needed
 420                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 421
 422                 // Build the signed data
 423                 $type = $base->data[0]->attributes()->type[0];
 424                 $encoding = $base->encoding;
 425                 $alg = $base->alg;
 426                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 427
 428                 // This is the signature
 429                 $signature = Strings::base64UrlDecode($base->sig);
 430
 431                 // Get the senders' public key
 432                 $key_id = $base->sig[0]->attributes()->key_id[0];
 433                 $author_addr = base64_decode($key_id);
 434                 if ($author_addr == '') {
 435                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 436                         if ($no_exit) {
 437                                 return false;
 438                         } else {
 439                                 System::httpExit(400);
 440                         }
 441                 }
 442
 443                 $key = self::key($author_addr);
 444                 if ($key == '') {
 445                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 446                         if ($no_exit) {
 447                                 return false;
 448                         } else {
 449                                 System::httpExit(400);
 450                         }
 451                 }
 452
 453                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 454                 if (!$verify) {
 455                         Logger::log('Message did not verify. Discarding.');
 456                         if ($no_exit) {
 457                                 return false;
 458                         } else {
 459                                 System::httpExit(400);
 460                         }
 461                 }
 462
 463                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 464                                 'author' => XML::unescape($author_addr),
 465                                 'key' => (string)$key];
 466         }
 467
 468         /**
 469          * @brief: Decodes incoming Diaspora message in the deprecated format
 470          *
 471          * @param array  $importer Array of the importer user
 472          * @param string $xml      urldecoded Diaspora salmon
 473          *
 474          * @return array
 475          * 'message' -> decoded Diaspora XML message
 476          * 'author' -> author diaspora handle
 477          * 'key' -> author public key (converted to pkcs#8)
 478          */
 479         public static function decode(array $importer, $xml)
 480         {
 481                 $public = false;
 482                 $basedom = XML::parseString($xml);
 483
 484                 if (!is_object($basedom)) {
 485                         Logger::log("XML is not parseable.");
 486                         return false;
 487                 }
 488                 $children = $basedom->children('https://joindiaspora.com/protocol');
 489
 490                 $inner_aes_key = null;
 491                 $inner_iv = null;
 492
 493                 if ($children->header) {
 494                         $public = true;
 495                         $author_link = str_replace('acct:', '', $children->header->author_id);
 496                 } else {
 497                         // This happens with posts from a relais
 498                         if (!$importer) {
 499                                 Logger::log("This is no private post in the old format", Logger::DEBUG);
 500                                 return false;
 501                         }
 502
 503                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 504
 505                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 506                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 507
 508                         $outer_key_bundle = '';
 509                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 510
 511                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 512
 513                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 514                         $outer_key = base64_decode($j_outer_key_bundle->key);
 515
 516                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 517
 518                         Logger::log('decrypted: '.$decrypted, Logger::DEBUG);
 519                         $idom = XML::parseString($decrypted);
 520
 521                         $inner_iv = base64_decode($idom->iv);
 522                         $inner_aes_key = base64_decode($idom->aes_key);
 523
 524                         $author_link = str_replace('acct:', '', $idom->author_id);
 525                 }
 526
 527                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 528
 529                 // figure out where in the DOM tree our data is hiding
 530
 531                 $base = null;
 532                 if ($dom->provenance->data) {
 533                         $base = $dom->provenance;
 534                 } elseif ($dom->env->data) {
 535                         $base = $dom->env;
 536                 } elseif ($dom->data) {
 537                         $base = $dom;
 538                 }
 539
 540                 if (!$base) {
 541                         Logger::log('unable to locate salmon data in xml');
 542                         System::httpExit(400);
 543                 }
 544
 545
 546                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 547                 $signature = Strings::base64UrlDecode($base->sig);
 548
 549                 // unpack the  data
 550
 551                 // strip whitespace so our data element will return to one big base64 blob
 552                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 553
 554
 555                 // stash away some other stuff for later
 556
 557                 $type = $base->data[0]->attributes()->type[0];
 558                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 559                 $encoding = $base->encoding;
 560                 $alg = $base->alg;
 561
 562
 563                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 564
 565
 566                 // decode the data
 567                 $data = Strings::base64UrlDecode($data);
 568
 569
 570                 if ($public) {
 571                         $inner_decrypted = $data;
 572                 } else {
 573                         // Decode the encrypted blob
 574                         $inner_encrypted = base64_decode($data);
 575                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 576                 }
 577
 578                 if (!$author_link) {
 579                         Logger::log('Could not retrieve author URI.');
 580                         System::httpExit(400);
 581                 }
 582                 // Once we have the author URI, go to the web and try to find their public key
 583                 // (first this will look it up locally if it is in the fcontact cache)
 584                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 585
 586                 Logger::log('Fetching key for '.$author_link);
 587                 $key = self::key($author_link);
 588
 589                 if (!$key) {
 590                         Logger::log('Could not retrieve author key.');
 591                         System::httpExit(400);
 592                 }
 593
 594                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 595
 596                 if (!$verify) {
 597                         Logger::log('Message did not verify. Discarding.');
 598                         System::httpExit(400);
 599                 }
 600
 601                 Logger::log('Message verified.');
 602
 603                 return ['message' => (string)$inner_decrypted,
 604                                 'author' => XML::unescape($author_link),
 605                                 'key' => (string)$key];
 606         }
 607
 608
 609         /**
 610          * @brief Dispatches public messages and find the fitting receivers
 611          *
 612          * @param array $msg The post that will be dispatched
 613          *
 614          * @return int The message id of the generated message, "true" or "false" if there was an error
 615          */
 616         public static function dispatchPublic($msg)
 617         {
 618                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 619                 if (!$enabled) {
 620                         Logger::log("diaspora is disabled");
 621                         return false;
 622                 }
 623
 624                 if (!($fields = self::validPosting($msg))) {
 625                         Logger::log("Invalid posting");
 626                         return false;
 627                 }
 628
 629                 $importer = ["uid" => 0, "page-flags" => Contact::PAGE_FREELOVE];
 630                 $success = self::dispatch($importer, $msg, $fields);
 631
 632                 return $success;
 633         }
 634
 635         /**
 636          * @brief Dispatches the different message types to the different functions
 637          *
 638          * @param array  $importer Array of the importer user
 639          * @param array  $msg      The post that will be dispatched
 640          * @param object $fields   SimpleXML object that contains the message
 641          *
 642          * @return int The message id of the generated message, "true" or "false" if there was an error
 643          */
 644         public static function dispatch(array $importer, $msg, $fields = null)
 645         {
 646                 // The sender is the handle of the contact that sent the message.
 647                 // This will often be different with relayed messages (for example "like" and "comment")
 648                 $sender = $msg["author"];
 649
 650                 // This is only needed for private postings since this is already done for public ones before
 651                 if (is_null($fields)) {
 652                         $private = true;
 653                         if (!($fields = self::validPosting($msg))) {
 654                                 Logger::log("Invalid posting");
 655                                 return false;
 656                         }
 657                 } else {
 658                         $private = false;
 659                 }
 660
 661                 $type = $fields->getName();
 662
 663                 Logger::log("Received message type ".$type." from ".$sender." for user ".$importer["uid"], Logger::DEBUG);
 664
 665                 switch ($type) {
 666                         case "account_migration":
 667                                 if (!$private) {
 668                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 669                                         return false;
 670                                 }
 671                                 return self::receiveAccountMigration($importer, $fields);
 672
 673                         case "account_deletion":
 674                                 return self::receiveAccountDeletion($fields);
 675
 676                         case "comment":
 677                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 678
 679                         case "contact":
 680                                 if (!$private) {
 681                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 682                                         return false;
 683                                 }
 684                                 return self::receiveContactRequest($importer, $fields);
 685
 686                         case "conversation":
 687                                 if (!$private) {
 688                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 689                                         return false;
 690                                 }
 691                                 return self::receiveConversation($importer, $msg, $fields);
 692
 693                         case "like":
 694                                 return self::receiveLike($importer, $sender, $fields);
 695
 696                         case "message":
 697                                 if (!$private) {
 698                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 699                                         return false;
 700                                 }
 701                                 return self::receiveMessage($importer, $fields);
 702
 703                         case "participation":
 704                                 if (!$private) {
 705                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 706                                         return false;
 707                                 }
 708                                 return self::receiveParticipation($importer, $fields);
 709
 710                         case "photo": // Not implemented
 711                                 return self::receivePhoto($importer, $fields);
 712
 713                         case "poll_participation": // Not implemented
 714                                 return self::receivePollParticipation($importer, $fields);
 715
 716                         case "profile":
 717                                 if (!$private) {
 718                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 719                                         return false;
 720                                 }
 721                                 return self::receiveProfile($importer, $fields);
 722
 723                         case "reshare":
 724                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 725
 726                         case "retraction":
 727                                 return self::receiveRetraction($importer, $sender, $fields);
 728
 729                         case "status_message":
 730                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 731
 732                         default:
 733                                 Logger::log("Unknown message type ".$type);
 734                                 return false;
 735                 }
 736
 737                 return true;
 738         }
 739
 740         /**
 741          * @brief Checks if a posting is valid and fetches the data fields.
 742          *
 743          * This function does not only check the signature.
 744          * It also does the conversion between the old and the new diaspora format.
 745          *
 746          * @param array $msg Array with the XML, the sender handle and the sender signature
 747          *
 748          * @return bool|array If the posting is valid then an array with an SimpleXML object is returned
 749          */
 750         private static function validPosting($msg)
 751         {
 752                 $data = XML::parseString($msg["message"]);
 753
 754                 if (!is_object($data)) {
 755                         Logger::log("No valid XML ".$msg["message"], Logger::DEBUG);
 756                         return false;
 757                 }
 758
 759                 // Is this the new or the old version?
 760                 if ($data->getName() == "XML") {
 761                         $oldXML = true;
 762                         foreach ($data->post->children() as $child) {
 763                                 $element = $child;
 764                         }
 765                 } else {
 766                         $oldXML = false;
 767                         $element = $data;
 768                 }
 769
 770                 $type = $element->getName();
 771                 $orig_type = $type;
 772
 773                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 774
 775                 // All retractions are handled identically from now on.
 776                 // In the new version there will only be "retraction".
 777                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 778                         $type = "retraction";
 779
 780                 if ($type == "request") {
 781                         $type = "contact";
 782                 }
 783
 784                 $fields = new SimpleXMLElement("<".$type."/>");
 785
 786                 $signed_data = "";
 787                 $author_signature = null;
 788                 $parent_author_signature = null;
 789
 790                 foreach ($element->children() as $fieldname => $entry) {
 791                         if ($oldXML) {
 792                                 // Translation for the old XML structure
 793                                 if ($fieldname == "diaspora_handle") {
 794                                         $fieldname = "author";
 795                                 }
 796                                 if ($fieldname == "participant_handles") {
 797                                         $fieldname = "participants";
 798                                 }
 799                                 if (in_array($type, ["like", "participation"])) {
 800                                         if ($fieldname == "target_type") {
 801                                                 $fieldname = "parent_type";
 802                                         }
 803                                 }
 804                                 if ($fieldname == "sender_handle") {
 805                                         $fieldname = "author";
 806                                 }
 807                                 if ($fieldname == "recipient_handle") {
 808                                         $fieldname = "recipient";
 809                                 }
 810                                 if ($fieldname == "root_diaspora_id") {
 811                                         $fieldname = "root_author";
 812                                 }
 813                                 if ($type == "status_message") {
 814                                         if ($fieldname == "raw_message") {
 815                                                 $fieldname = "text";
 816                                         }
 817                                 }
 818                                 if ($type == "retraction") {
 819                                         if ($fieldname == "post_guid") {
 820                                                 $fieldname = "target_guid";
 821                                         }
 822                                         if ($fieldname == "type") {
 823                                                 $fieldname = "target_type";
 824                                         }
 825                                 }
 826                         }
 827
 828                         if (($fieldname == "author_signature") && ($entry != "")) {
 829                                 $author_signature = base64_decode($entry);
 830                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 831                                 $parent_author_signature = base64_decode($entry);
 832                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 833                                 if ($signed_data != "") {
 834                                         $signed_data .= ";";
 835                                 }
 836
 837                                 $signed_data .= $entry;
 838                         }
 839                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 840                                 || ($orig_type == "relayable_retraction")
 841                         ) {
 842                                 XML::copy($entry, $fields, $fieldname);
 843                         }
 844                 }
 845
 846                 // This is something that shouldn't happen at all.
 847                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 848                         if ($msg["author"] != $fields->author) {
 849                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 850                                 return false;
 851                         }
 852                 }
 853
 854                 // Only some message types have signatures. So we quit here for the other types.
 855                 if (!in_array($type, ["comment", "like"])) {
 856                         return $fields;
 857                 }
 858                 // No author_signature? This is a must, so we quit.
 859                 if (!isset($author_signature)) {
 860                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 861                         return false;
 862                 }
 863
 864                 if (isset($parent_author_signature)) {
 865                         $key = self::key($msg["author"]);
 866                         if (empty($key)) {
 867                                 Logger::log("No key found for parent author ".$msg["author"], Logger::DEBUG);
 868                                 return false;
 869                         }
 870
 871                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 872                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 873                                 return false;
 874                         }
 875                 }
 876
 877                 $key = self::key($fields->author);
 878                 if (empty($key)) {
 879                         Logger::log("No key found for author ".$fields->author, Logger::DEBUG);
 880                         return false;
 881                 }
 882
 883                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 884                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 885                         return false;
 886                 } else {
 887                         return $fields;
 888                 }
 889         }
 890
 891         /**
 892          * @brief Fetches the public key for a given handle
 893          *
 894          * @param string $handle The handle
 895          *
 896          * @return string The public key
 897          */
 898         private static function key($handle)
 899         {
 900                 $handle = strval($handle);
 901
 902                 Logger::log("Fetching diaspora key for: ".$handle);
 903
 904                 $r = self::personByHandle($handle);
 905                 if ($r) {
 906                         return $r["pubkey"];
 907                 }
 908
 909                 return "";
 910         }
 911
 912         /**
 913          * @brief Fetches data for a given handle
 914          *
 915          * @param string $handle The handle
 916          *
 917          * @return array the queried data
 918          */
 919         public static function personByHandle($handle)
 920         {
 921                 $update = false;
 922
 923                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 924                 if (DBA::isResult($person)) {
 925                         Logger::log("In cache " . print_r($person, true), Logger::DEBUG);
 926
 927                         // update record occasionally so it doesn't get stale
 928                         $d = strtotime($person["updated"]." +00:00");
 929                         if ($d < strtotime("now - 14 days")) {
 930                                 $update = true;
 931                         }
 932
 933                         if ($person["guid"] == "") {
 934                                 $update = true;
 935                         }
 936                 }
 937
 938                 if (!DBA::isResult($person) || $update) {
 939                         Logger::log("create or refresh", Logger::DEBUG);
 940                         $r = Probe::uri($handle, Protocol::DIASPORA);
 941
 942                         // Note that Friendica contacts will return a "Diaspora person"
 943                         // if Diaspora connectivity is enabled on their server
 944                         if ($r && ($r["network"] === Protocol::DIASPORA)) {
 945                                 self::updateFContact($r);
 946
 947                                 // Fetch the updated or added contact
 948                                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 949                                 if (!DBA::isResult($person)) {
 950                                         $person = $r;
 951                                         $person['id'] = 0;
 952                                 }
 953                         }
 954                 }
 955
 956                 return $person;
 957         }
 958
 959         /**
 960          * @brief Updates the fcontact table
 961          *
 962          * @param array $arr The fcontact data
 963          */
 964         private static function updateFContact($arr)
 965         {
 966                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
 967                         'request' => $arr["request"], 'nick' => $arr["nick"],
 968                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
 969                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
 970                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
 971                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
 972                         'updated' => DateTimeFormat::utcNow()];
 973
 974                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
 975
 976                 DBA::update('fcontact', $fields, $condition, true);
 977         }
 978
 979         /**
 980          * @brief get a handle (user@domain.tld) from a given contact id
 981          *
 982          * @param int $contact_id  The id in the contact table
 983          * @param int $pcontact_id The id in the contact table (Used for the public contact)
 984          *
 985          * @return string the handle
 986          */
 987         private static function handleFromContact($contact_id, $pcontact_id = 0)
 988         {
 989                 $handle = false;
 990
 991                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
 992
 993                 if ($pcontact_id != 0) {
 994                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
 995
 996                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
 997                                 return strtolower($contact["addr"]);
 998                         }
 999                 }
1000
1001                 $r = q(
1002                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1003                         intval($contact_id)
1004                 );
1005
1006                 if (DBA::isResult($r)) {
1007                         $contact = $r[0];
1008
1009                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
1010
1011                         if ($contact['addr'] != "") {
1012                                 $handle = $contact['addr'];
1013                         } else {
1014                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1015                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1016                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1017                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1018                                 $handle = $contact['nick'].'@'.$baseurl;
1019                         }
1020                 }
1021
1022                 return strtolower($handle);
1023         }
1024
1025         /**
1026          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1027          * fcontact guid
1028          *
1029          * @param mixed $fcontact_guid Hexadecimal string guid
1030          *
1031          * @return string the contact url or null
1032          */
1033         public static function urlFromContactGuid($fcontact_guid)
1034         {
1035                 Logger::log("fcontact guid is ".$fcontact_guid, Logger::DEBUG);
1036
1037                 $r = q(
1038                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1039                         DBA::escape(Protocol::DIASPORA),
1040                         DBA::escape($fcontact_guid)
1041                 );
1042
1043                 if (DBA::isResult($r)) {
1044                         return $r[0]['url'];
1045                 }
1046
1047                 return null;
1048         }
1049
1050         /**
1051          * @brief Get a contact id for a given handle
1052          *
1053          * @todo Move to Friendica\Model\Contact
1054          *
1055          * @param int    $uid    The user id
1056          * @param string $handle The handle in the format user@domain.tld
1057          *
1058          * @return int Contact id
1059          */
1060         private static function contactByHandle($uid, $handle)
1061         {
1062                 $cid = Contact::getIdForURL($handle, $uid);
1063                 if (!$cid) {
1064                         $handle_parts = explode("@", $handle);
1065                         $nurl_sql = "%%://" . $handle_parts[1] . "%%/profile/" . $handle_parts[0];
1066                         $cid = Contact::getIdForURL($nurl_sql, $uid);
1067                 }
1068
1069                 if (!$cid) {
1070                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1071                         return false;
1072                 }
1073
1074                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1075                 if (!DBA::isResult($contact)) {
1076                         // This here shouldn't happen at all
1077                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1078                         return false;
1079                 }
1080
1081                 return $contact;
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(array $importer, array $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 && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(Contact::PAGE_FREELOVE))) {
1103                 //      DBA::update(
1104                 //              'contact',
1105                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1106                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1107                 //      );
1108                 //
1109                 //      $contact["rel"] = Contact::FRIEND;
1110                 //      Logger::log("defining user ".$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::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1119                         // Yes, then it is fine.
1120                         return true;
1121                         // Is it a post to a community?
1122                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [Contact::PAGE_COMMUNITY, Contact::PAGE_PRVGROUP])) {
1123                         // That's good
1124                         return true;
1125                         // Is the message a global user or a comment?
1126                 } elseif (($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(array $importer, $handle, $is_comment = false)
1144         {
1145                 $contact = self::contactByHandle($importer["uid"], $handle);
1146                 if (!$contact) {
1147                         Logger::log("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 ($is_comment && ($importer["uid"] != 0)) {
1150                                 return self::contactByHandle(0, $handle);
1151                         } elseif ($is_comment) {
1152                                 return $importer;
1153                         } else {
1154                                 return false;
1155                         }
1156                 }
1157
1158                 if (!self::postAllow($importer, $contact, $is_comment)) {
1159                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1160                         return false;
1161                 }
1162                 return $contact;
1163         }
1164
1165         /**
1166          * @brief Does the message already exists on the system?
1167          *
1168          * @param int    $uid  The user id
1169          * @param string $guid The guid of the message
1170          *
1171          * @return int|bool message id if the message already was stored into the system - or false.
1172          */
1173         private static function messageExists($uid, $guid)
1174         {
1175                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1176                 if (DBA::isResult($item)) {
1177                         Logger::log("message ".$guid." already exists for user ".$uid);
1178                         return $item["id"];
1179                 }
1180
1181                 return false;
1182         }
1183
1184         /**
1185          * @brief Checks for links to posts in a message
1186          *
1187          * @param array $item The item array
1188          * @return void
1189          */
1190         private static function fetchGuid(array $item)
1191         {
1192                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1193                 preg_replace_callback(
1194                         $expression,
1195                         function ($match) use ($item) {
1196                                 self::fetchGuidSub($match, $item);
1197                         },
1198                         $item["body"]
1199                 );
1200
1201                 preg_replace_callback(
1202                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1203                         function ($match) use ($item) {
1204                                 self::fetchGuidSub($match, $item);
1205                         },
1206                         $item["body"]
1207                 );
1208         }
1209
1210         /**
1211          * @brief Checks for relative /people/* links in an item body to match local
1212          * contacts or prepends the remote host taken from the author link.
1213          *
1214          * @param string $body        The item body to replace links from
1215          * @param string $author_link The author link for missing local contact fallback
1216          *
1217          * @return string the replaced string
1218          */
1219         public static function replacePeopleGuid($body, $author_link)
1220         {
1221                 $return = preg_replace_callback(
1222                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1223                         function ($match) use ($author_link) {
1224                                 // $match
1225                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1226                                 // 1 => '0123456789abcdef'
1227                                 // 2 => 'Foo Bar'
1228                                 $handle = self::urlFromContactGuid($match[1]);
1229
1230                                 if ($handle) {
1231                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1232                                 } else {
1233                                         // No local match, restoring absolute remote URL from author scheme and host
1234                                         $author_url = parse_url($author_link);
1235                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1236                                 }
1237
1238                                 return $return;
1239                         },
1240                         $body
1241                 );
1242
1243                 return $return;
1244         }
1245
1246         /**
1247          * @brief sub function of "fetchGuid" which checks for links in messages
1248          *
1249          * @param array $match array containing a link that has to be checked for a message link
1250          * @param array $item  The item array
1251          * @return void
1252          */
1253         private static function fetchGuidSub($match, $item)
1254         {
1255                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1256                         self::storeByGuid($match[1], $item["owner-link"]);
1257                 }
1258         }
1259
1260         /**
1261          * @brief Fetches an item with a given guid from a given server
1262          *
1263          * @param string $guid   the message guid
1264          * @param string $server The server address
1265          * @param int    $uid    The user id of the user
1266          *
1267          * @return int the message id of the stored message or false
1268          */
1269         private static function storeByGuid($guid, $server, $uid = 0)
1270         {
1271                 $serverparts = parse_url($server);
1272
1273                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1274                         return false;
1275                 }
1276
1277                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1278
1279                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1280
1281                 $msg = self::message($guid, $server);
1282
1283                 if (!$msg) {
1284                         return false;
1285                 }
1286
1287                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1288
1289                 // Now call the dispatcher
1290                 return self::dispatchPublic($msg);
1291         }
1292
1293         /**
1294          * @brief Fetches a message from a server
1295          *
1296          * @param string $guid   message guid
1297          * @param string $server The url of the server
1298          * @param int    $level  Endless loop prevention
1299          *
1300          * @return array
1301          *      'message' => The message XML
1302          *      'author' => The author handle
1303          *      'key' => The public key of the author
1304          */
1305         private static function message($guid, $server, $level = 0)
1306         {
1307                 if ($level > 5) {
1308                         return false;
1309                 }
1310
1311                 // This will work for new Diaspora servers and Friendica servers from 3.5
1312                 $source_url = $server."/fetch/post/".urlencode($guid);
1313
1314                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1315
1316                 $envelope = Network::fetchUrl($source_url);
1317                 if ($envelope) {
1318                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1319                         $x = self::verifyMagicEnvelope($envelope);
1320                         if (!$x) {
1321                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1322                         } else {
1323                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1324                         }
1325                 } else {
1326                         $x = false;
1327                 }
1328
1329                 // This will work for older Diaspora and Friendica servers
1330                 if (!$x) {
1331                         $source_url = $server."/p/".urlencode($guid).".xml";
1332                         Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1333
1334                         $x = Network::fetchUrl($source_url);
1335                         if (!$x) {
1336                                 return false;
1337                         }
1338                 }
1339
1340                 $source_xml = XML::parseString($x);
1341
1342                 if (!is_object($source_xml)) {
1343                         return false;
1344                 }
1345
1346                 if ($source_xml->post->reshare) {
1347                         // Reshare of a reshare - old Diaspora version
1348                         Logger::log("Message is a reshare", Logger::DEBUG);
1349                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1350                 } elseif ($source_xml->getName() == "reshare") {
1351                         // Reshare of a reshare - new Diaspora version
1352                         Logger::log("Message is a new reshare", Logger::DEBUG);
1353                         return self::message($source_xml->root_guid, $server, ++$level);
1354                 }
1355
1356                 $author = "";
1357
1358                 // Fetch the author - for the old and the new Diaspora version
1359                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1360                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1361                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1362                         $author = (string)$source_xml->author;
1363                 }
1364
1365                 // If this isn't a "status_message" then quit
1366                 if (!$author) {
1367                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1368                         return false;
1369                 }
1370
1371                 $msg = ["message" => $x, "author" => $author];
1372
1373                 $msg["key"] = self::key($msg["author"]);
1374
1375                 return $msg;
1376         }
1377
1378         /**
1379          * @brief Fetches the item record of a given guid
1380          *
1381          * @param int    $uid     The user id
1382          * @param string $guid    message guid
1383          * @param string $author  The handle of the item
1384          * @param array  $contact The contact of the item owner
1385          *
1386          * @return array the item record
1387          */
1388         private static function parentItem($uid, $guid, $author, array $contact)
1389         {
1390                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1391                         'author-name', 'author-link', 'author-avatar',
1392                         'owner-name', 'owner-link', 'owner-avatar'];
1393                 $condition = ['uid' => $uid, 'guid' => $guid];
1394                 $item = Item::selectFirst($fields, $condition);
1395
1396                 if (!DBA::isResult($item)) {
1397                         $person = self::personByHandle($author);
1398                         $result = self::storeByGuid($guid, $person["url"], $uid);
1399
1400                         // We don't have an url for items that arrived at the public dispatcher
1401                         if (!$result && !empty($contact["url"])) {
1402                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1403                         }
1404
1405                         if ($result) {
1406                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1407
1408                                 $item = Item::selectFirst($fields, $condition);
1409                         }
1410                 }
1411
1412                 if (!DBA::isResult($item)) {
1413                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1414                         return false;
1415                 } else {
1416                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1417                         return $item;
1418                 }
1419         }
1420
1421         /**
1422          * @brief returns contact details
1423          *
1424          * @param array $def_contact The default contact if the person isn't found
1425          * @param array $person      The record of the person
1426          * @param int   $uid         The user id
1427          *
1428          * @return array
1429          *      'cid' => contact id
1430          *      'network' => network type
1431          */
1432         private static function authorContactByUrl($def_contact, $person, $uid)
1433         {
1434                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1435                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1436                 if (DBA::isResult($contact)) {
1437                         $cid = $contact["id"];
1438                         $network = $contact["network"];
1439                 } else {
1440                         $cid = $def_contact["id"];
1441                         $network = Protocol::DIASPORA;
1442                 }
1443
1444                 return ["cid" => $cid, "network" => $network];
1445         }
1446
1447         /**
1448          * @brief Is the profile a hubzilla profile?
1449          *
1450          * @param string $url The profile link
1451          *
1452          * @return bool is it a hubzilla server?
1453          */
1454         public static function isRedmatrix($url)
1455         {
1456                 return(strstr($url, "/channel/"));
1457         }
1458
1459         /**
1460          * @brief Generate a post link with a given handle and message guid
1461          *
1462          * @param string $addr        The user handle
1463          * @param string $guid        message guid
1464          * @param string $parent_guid optional parent guid
1465          *
1466          * @return string the post link
1467          */
1468         private static function plink($addr, $guid, $parent_guid = '')
1469         {
1470                 $contact = Contact::getDetailsByAddr($addr);
1471
1472                 // Fallback
1473                 if (!$contact) {
1474                         if ($parent_guid != '') {
1475                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1476                         } else {
1477                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1478                         }
1479                 }
1480
1481                 if ($contact["network"] == Protocol::DFRN) {
1482                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1483                 }
1484
1485                 if (self::isRedmatrix($contact["url"])) {
1486                         return $contact["url"] . "/?f=&mid=" . $guid;
1487                 }
1488
1489                 if ($parent_guid != '') {
1490                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1491                 } else {
1492                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1493                 }
1494         }
1495
1496         /**
1497          * @brief Receives account migration
1498          *
1499          * @param array  $importer Array of the importer user
1500          * @param object $data     The message object
1501          *
1502          * @return bool Success
1503          */
1504         private static function receiveAccountMigration(array $importer, $data)
1505         {
1506                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1507                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1508                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1509
1510                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1511                 if (!$contact) {
1512                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1513                         return false;
1514                 }
1515
1516                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1517
1518                 // Check signature
1519                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1520                 $key = self::key($old_handle);
1521                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1522                         Logger::log('No valid signature for migration.');
1523                         return false;
1524                 }
1525
1526                 // Update the profile
1527                 self::receiveProfile($importer, $data->profile);
1528
1529                 // change the technical stuff in contact and gcontact
1530                 $data = Probe::uri($new_handle);
1531                 if ($data['network'] == Protocol::PHANTOM) {
1532                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1533                         return false;
1534                 }
1535
1536                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1537                                 'name' => $data['name'], 'nick' => $data['nick'],
1538                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1539                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1540                                 'network' => $data['network']];
1541
1542                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1543
1544                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1545                                 'name' => $data['name'], 'nick' => $data['nick'],
1546                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1547                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1548                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1549
1550                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1551
1552                 Logger::log('Contacts are updated.');
1553
1554                 return true;
1555         }
1556
1557         /**
1558          * @brief Processes an account deletion
1559          *
1560          * @param object $data     The message object
1561          *
1562          * @return bool Success
1563          */
1564         private static function receiveAccountDeletion($data)
1565         {
1566                 $author = Strings::escapeTags(XML::unescape($data->author));
1567
1568                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1569                 while ($contact = DBA::fetch($contacts)) {
1570                         Contact::remove($contact["id"]);
1571                 }
1572
1573                 DBA::delete('gcontact', ['addr' => $author]);
1574
1575                 Logger::log('Removed contacts for ' . $author);
1576
1577                 return true;
1578         }
1579
1580         /**
1581          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1582          *
1583          * @param string  $author    Author handle
1584          * @param string  $guid      Message guid
1585          * @param boolean $onlyfound Only return uri when found in the database
1586          *
1587          * @return string The constructed uri or the one from our database
1588          */
1589         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1590         {
1591                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1592                 if (DBA::isResult($item)) {
1593                         return $item["uri"];
1594                 } elseif (!$onlyfound) {
1595                         $person = self::personByHandle($author);
1596
1597                         $parts = parse_url($person['url']);
1598                         unset($parts['path']);
1599                         $host_url = Network::unparseURL($parts);
1600
1601                         return $host_url . '/objects/' . $guid;
1602                 }
1603
1604                 return "";
1605         }
1606
1607         /**
1608          * @brief Fetch the guid from our database with a given uri
1609          *
1610          * @param string $uri Message uri
1611          * @param string $uid Author handle
1612          *
1613          * @return string The post guid
1614          */
1615         private static function getGuidFromUri($uri, $uid)
1616         {
1617                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1618                 if (DBA::isResult($item)) {
1619                         return $item["guid"];
1620                 } else {
1621                         return false;
1622                 }
1623         }
1624
1625         /**
1626          * @brief Find the best importer for a comment, like, ...
1627          *
1628          * @param string $guid The guid of the item
1629          *
1630          * @return array|boolean the origin owner of that post - or false
1631          */
1632         private static function importerForGuid($guid)
1633         {
1634                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1635                 if (DBA::isResult($item)) {
1636                         Logger::log("Found user ".$item['uid']." as owner of item ".$guid, Logger::DEBUG);
1637                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1638                         if (DBA::isResult($contact)) {
1639                                 return $contact;
1640                         }
1641                 }
1642                 return false;
1643         }
1644
1645         /**
1646          * @brief Processes an incoming comment
1647          *
1648          * @param array  $importer Array of the importer user
1649          * @param string $sender   The sender of the message
1650          * @param object $data     The message object
1651          * @param string $xml      The original XML of the message
1652          *
1653          * @return int The message id of the generated comment or "false" if there was an error
1654          */
1655         private static function receiveComment(array $importer, $sender, $data, $xml)
1656         {
1657                 $author = Strings::escapeTags(XML::unescape($data->author));
1658                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1659                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1660                 $text = XML::unescape($data->text);
1661
1662                 if (isset($data->created_at)) {
1663                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1664                 } else {
1665                         $created_at = DateTimeFormat::utcNow();
1666                 }
1667
1668                 if (isset($data->thread_parent_guid)) {
1669                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1670                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1671                 } else {
1672                         $thr_uri = "";
1673                 }
1674
1675                 $contact = self::allowedContactByHandle($importer, $sender, true);
1676                 if (!$contact) {
1677                         return false;
1678                 }
1679
1680                 $message_id = self::messageExists($importer["uid"], $guid);
1681                 if ($message_id) {
1682                         return true;
1683                 }
1684
1685                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1686                 if (!$parent_item) {
1687                         return false;
1688                 }
1689
1690                 $person = self::personByHandle($author);
1691                 if (!is_array($person)) {
1692                         Logger::log("unable to find author details");
1693                         return false;
1694                 }
1695
1696                 // Fetch the contact id - if we know this contact
1697                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1698
1699                 $datarray = [];
1700
1701                 $datarray["uid"] = $importer["uid"];
1702                 $datarray["contact-id"] = $author_contact["cid"];
1703                 $datarray["network"]  = $author_contact["network"];
1704
1705                 $datarray["author-link"] = $person["url"];
1706                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1707
1708                 $datarray["owner-link"] = $contact["url"];
1709                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1710
1711                 $datarray["guid"] = $guid;
1712                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1713
1714                 $datarray["verb"] = ACTIVITY_POST;
1715                 $datarray["gravity"] = GRAVITY_COMMENT;
1716
1717                 if ($thr_uri != "") {
1718                         $datarray["parent-uri"] = $thr_uri;
1719                 } else {
1720                         $datarray["parent-uri"] = $parent_item["uri"];
1721                 }
1722
1723                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1724
1725                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1726                 $datarray["source"] = $xml;
1727
1728                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1729
1730                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1731
1732                 $body = Markdown::toBBCode($text);
1733
1734                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1735
1736                 self::fetchGuid($datarray);
1737
1738                 // If we are the origin of the parent we store the original data.
1739                 // We notify our followers during the item storage.
1740                 if ($parent_item["origin"]) {
1741                         $datarray['diaspora_signed_text'] = json_encode($data);
1742                 }
1743
1744                 $message_id = Item::insert($datarray);
1745
1746                 if ($message_id <= 0) {
1747                         return false;
1748                 }
1749
1750                 if ($message_id) {
1751                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1752                         if ($datarray['uid'] == 0) {
1753                                 Item::distribute($message_id, json_encode($data));
1754                         }
1755                 }
1756
1757                 return true;
1758         }
1759
1760         /**
1761          * @brief processes and stores private messages
1762          *
1763          * @param array  $importer     Array of the importer user
1764          * @param array  $contact      The contact of the message
1765          * @param object $data         The message object
1766          * @param array  $msg          Array of the processed message, author handle and key
1767          * @param object $mesg         The private message
1768          * @param array  $conversation The conversation record to which this message belongs
1769          *
1770          * @return bool "true" if it was successful
1771          */
1772         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1773         {
1774                 $author = Strings::escapeTags(XML::unescape($data->author));
1775                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1776                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1777
1778                 // "diaspora_handle" is the element name from the old version
1779                 // "author" is the element name from the new version
1780                 if ($mesg->author) {
1781                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1782                 } elseif ($mesg->diaspora_handle) {
1783                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1784                 } else {
1785                         return false;
1786                 }
1787
1788                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1789                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1790                 $msg_text = XML::unescape($mesg->text);
1791                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1792
1793                 if ($msg_conversation_guid != $guid) {
1794                         Logger::log("message conversation guid does not belong to the current conversation.");
1795                         return false;
1796                 }
1797
1798                 $body = Markdown::toBBCode($msg_text);
1799                 $message_uri = $msg_author.":".$msg_guid;
1800
1801                 $person = self::personByHandle($msg_author);
1802
1803                 DBA::lock('mail');
1804
1805                 if (DBA::exists('mail', ['guid' => $msg_guid, 'uid' => $importer["uid"]])) {
1806                         Logger::log("duplicate message already delivered.", Logger::DEBUG);
1807                         return false;
1808                 }
1809
1810                 DBA::insert('mail', [
1811                         'uid'        => $importer['uid'],
1812                         'guid'       => $msg_guid,
1813                         'convid'     => $conversation['id'],
1814                         'from-name'  => $person['name'],
1815                         'from-photo' => $person['photo'],
1816                         'from-url'   => $person['url'],
1817                         'contact-id' => $contact['id'],
1818                         'title'      => $subject,
1819                         'body'       => $body,
1820                         'seen'       => 0,
1821                         'reply'      => 0,
1822                         'uri'        => $message_uri,
1823                         'parent-uri' => $author . ':' . $guid,
1824                         'created'    => $msg_created_at
1825                 ]);
1826
1827                 $message_id = DBA::lastInsertId();
1828
1829                 DBA::unlock();
1830
1831                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
1832
1833                 notification([
1834                         "type" => NOTIFY_MAIL,
1835                         "notify_flags" => $importer["notify-flags"],
1836                         "language" => $importer["language"],
1837                         "to_name" => $importer["username"],
1838                         "to_email" => $importer["email"],
1839                         "uid" => $importer["uid"],
1840                         "item" => ["id" => $message_id, "title" => $subject, "subject" => $subject, "body" => $body],
1841                         "parent" => $conversation["id"],
1842                         "source_name" => $person["name"],
1843                         "source_link" => $person["url"],
1844                         "source_photo" => $person["photo"],
1845                         "verb" => ACTIVITY_POST,
1846                         "otype" => "mail"
1847                 ]);
1848
1849                 return true;
1850         }
1851
1852         /**
1853          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1854          *
1855          * @param array  $importer Array of the importer user
1856          * @param array  $msg      Array of the processed message, author handle and key
1857          * @param object $data     The message object
1858          *
1859          * @return bool Success
1860          */
1861         private static function receiveConversation(array $importer, $msg, $data)
1862         {
1863                 $author = Strings::escapeTags(XML::unescape($data->author));
1864                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1865                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1866                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1867                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1868
1869                 $messages = $data->message;
1870
1871                 if (!count($messages)) {
1872                         Logger::log("empty conversation");
1873                         return false;
1874                 }
1875
1876                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1877                 if (!$contact) {
1878                         return false;
1879                 }
1880
1881                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1882                 if (!DBA::isResult($conversation)) {
1883                         $r = q(
1884                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1885                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1886                                 intval($importer["uid"]),
1887                                 DBA::escape($guid),
1888                                 DBA::escape($author),
1889                                 DBA::escape($created_at),
1890                                 DBA::escape(DateTimeFormat::utcNow()),
1891                                 DBA::escape($subject),
1892                                 DBA::escape($participants)
1893                         );
1894                         if ($r) {
1895                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1896                         }
1897                 }
1898                 if (!$conversation) {
1899                         Logger::log("unable to create conversation.");
1900                         return false;
1901                 }
1902
1903                 foreach ($messages as $mesg) {
1904                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1905                 }
1906
1907                 return true;
1908         }
1909
1910         /**
1911          * @brief Processes "like" messages
1912          *
1913          * @param array  $importer Array of the importer user
1914          * @param string $sender   The sender of the message
1915          * @param object $data     The message object
1916          *
1917          * @return int The message id of the generated like or "false" if there was an error
1918          */
1919         private static function receiveLike(array $importer, $sender, $data)
1920         {
1921                 $author = Strings::escapeTags(XML::unescape($data->author));
1922                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1923                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1924                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
1925                 $positive = Strings::escapeTags(XML::unescape($data->positive));
1926
1927                 // likes on comments aren't supported by Diaspora - only on posts
1928                 // But maybe this will be supported in the future, so we will accept it.
1929                 if (!in_array($parent_type, ["Post", "Comment"])) {
1930                         return false;
1931                 }
1932
1933                 $contact = self::allowedContactByHandle($importer, $sender, true);
1934                 if (!$contact) {
1935                         return false;
1936                 }
1937
1938                 $message_id = self::messageExists($importer["uid"], $guid);
1939                 if ($message_id) {
1940                         return true;
1941                 }
1942
1943                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1944                 if (!$parent_item) {
1945                         return false;
1946                 }
1947
1948                 $person = self::personByHandle($author);
1949                 if (!is_array($person)) {
1950                         Logger::log("unable to find author details");
1951                         return false;
1952                 }
1953
1954                 // Fetch the contact id - if we know this contact
1955                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1956
1957                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1958                 // We would accept this anyhow.
1959                 if ($positive == "true") {
1960                         $verb = ACTIVITY_LIKE;
1961                 } else {
1962                         $verb = ACTIVITY_DISLIKE;
1963                 }
1964
1965                 $datarray = [];
1966
1967                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1968
1969                 $datarray["uid"] = $importer["uid"];
1970                 $datarray["contact-id"] = $author_contact["cid"];
1971                 $datarray["network"]  = $author_contact["network"];
1972
1973                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1974                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1975
1976                 $datarray["guid"] = $guid;
1977                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1978
1979                 $datarray["verb"] = $verb;
1980                 $datarray["gravity"] = GRAVITY_ACTIVITY;
1981                 $datarray["parent-uri"] = $parent_item["uri"];
1982
1983                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1984
1985                 $datarray["body"] = $verb;
1986
1987                 // Diaspora doesn't provide a date for likes
1988                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
1989
1990                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
1991                 if ($parent_item["id"] != $parent_item["parent"]) {
1992                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item["parent"]]);
1993                         $origin = $toplevel["origin"];
1994                 } else {
1995                         $origin = $parent_item["origin"];
1996                 }
1997
1998                 // If we are the origin of the parent we store the original data.
1999                 // We notify our followers during the item storage.
2000                 if ($origin) {
2001                         $datarray['diaspora_signed_text'] = json_encode($data);
2002                 }
2003
2004                 $message_id = Item::insert($datarray);
2005
2006                 if ($message_id <= 0) {
2007                         return false;
2008                 }
2009
2010                 if ($message_id) {
2011                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2012                         if ($datarray['uid'] == 0) {
2013                                 Item::distribute($message_id, json_encode($data));
2014                         }
2015                 }
2016
2017                 return true;
2018         }
2019
2020         /**
2021          * @brief Processes private messages
2022          *
2023          * @param array  $importer Array of the importer user
2024          * @param object $data     The message object
2025          *
2026          * @return bool Success?
2027          */
2028         private static function receiveMessage(array $importer, $data)
2029         {
2030                 $author = Strings::escapeTags(XML::unescape($data->author));
2031                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2032                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
2033                 $text = XML::unescape($data->text);
2034                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2035
2036                 $contact = self::allowedContactByHandle($importer, $author, true);
2037                 if (!$contact) {
2038                         return false;
2039                 }
2040
2041                 $conversation = null;
2042
2043                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
2044                 $conversation = DBA::selectFirst('conv', [], $condition);
2045
2046                 if (!DBA::isResult($conversation)) {
2047                         Logger::log("conversation not available.");
2048                         return false;
2049                 }
2050
2051                 $message_uri = $author.":".$guid;
2052
2053                 $person = self::personByHandle($author);
2054                 if (!$person) {
2055                         Logger::log("unable to find author details");
2056                         return false;
2057                 }
2058
2059                 $body = Markdown::toBBCode($text);
2060
2061                 $body = self::replacePeopleGuid($body, $person["url"]);
2062
2063                 DBA::lock('mail');
2064
2065                 if (DBA::exists('mail', ['guid' => $guid, 'uid' => $importer["uid"]])) {
2066                         Logger::log("duplicate message already delivered.", Logger::DEBUG);
2067                         return false;
2068                 }
2069
2070                 DBA::insert('mail', [
2071                         'uid'        => $importer['uid'],
2072                         'guid'       => $guid,
2073                         'convid'     => $conversation['id'],
2074                         'from-name'  => $person['name'],
2075                         'from-photo' => $person['photo'],
2076                         'from-url'   => $person['url'],
2077                         'contact-id' => $contact['id'],
2078                         'title'      => $conversation['subject'],
2079                         'body'       => $body,
2080                         'seen'       => 0,
2081                         'reply'      => 1,
2082                         'uri'        => $message_uri,
2083                         'parent-uri' => $author.":".$conversation['guid'],
2084                         'created'    => $created_at
2085                 ]);
2086
2087                 $message_id = DBA::lastInsertId();
2088
2089                 DBA::unlock();
2090
2091                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
2092
2093                 notification([
2094                         "type" => NOTIFY_MAIL,
2095                         "notify_flags" => $importer["notify-flags"],
2096                         "language" => $importer["language"],
2097                         "to_name" => $importer["username"],
2098                         "to_email" => $importer["email"],
2099                         "uid" => $importer["uid"],
2100                         "item" => ["id" => $message_id, "title" => $conversation["subject"], "subject" => $conversation["subject"], "body" => $body],
2101                         "parent" => $conversation["id"],
2102                         "source_name" => $person["name"],
2103                         "source_link" => $person["url"],
2104                         "source_photo" => $person["photo"],
2105                         "verb" => ACTIVITY_POST,
2106                         "otype" => "mail"
2107                 ]);
2108
2109                 return true;
2110         }
2111
2112         /**
2113          * @brief Processes participations - unsupported by now
2114          *
2115          * @param array  $importer Array of the importer user
2116          * @param object $data     The message object
2117          *
2118          * @return bool always true
2119          */
2120         private static function receiveParticipation(array $importer, $data)
2121         {
2122                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2123                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2124
2125                 $contact_id = Contact::getIdForURL($author);
2126                 if (!$contact_id) {
2127                         Logger::log('Contact not found: '.$author);
2128                         return false;
2129                 }
2130
2131                 $person = self::personByHandle($author);
2132                 if (!is_array($person)) {
2133                         Logger::log("Person not found: ".$author);
2134                         return false;
2135                 }
2136
2137                 $item = Item::selectFirst(['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2138                 if (!DBA::isResult($item)) {
2139                         Logger::log('Item not found, no origin or private: '.$parent_guid);
2140                         return false;
2141                 }
2142
2143                 $author_parts = explode('@', $author);
2144                 if (isset($author_parts[1])) {
2145                         $server = $author_parts[1];
2146                 } else {
2147                         // Should never happen
2148                         $server = $author;
2149                 }
2150
2151                 Logger::log('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, Logger::DEBUG);
2152
2153                 if (!DBA::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2154                         DBA::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2155                 }
2156
2157                 // Send all existing comments and likes to the requesting server
2158                 $comments = Item::select(['id', 'parent', 'verb', 'self'], ['parent' => $item['id']]);
2159                 while ($comment = Item::fetch($comments)) {
2160                         if ($comment['id'] == $comment['parent']) {
2161                                 continue;
2162                         }
2163                         if ($comment['verb'] == ACTIVITY_POST) {
2164                                 $cmd = $comment['self'] ? 'comment-new' : 'comment-import';
2165                         } else {
2166                                 $cmd = $comment['self'] ? 'like' : 'comment-import';
2167                         }
2168                         Logger::log("Send ".$cmd." for item ".$comment['id']." to contact ".$contact_id, Logger::DEBUG);
2169                         Worker::add(PRIORITY_HIGH, 'Delivery', $cmd, $comment['id'], $contact_id);
2170                 }
2171                 DBA::close($comments);
2172
2173                 return true;
2174         }
2175
2176         /**
2177          * @brief Processes photos - unneeded
2178          *
2179          * @param array  $importer Array of the importer user
2180          * @param object $data     The message object
2181          *
2182          * @return bool always true
2183          */
2184         private static function receivePhoto(array $importer, $data)
2185         {
2186                 // There doesn't seem to be a reason for this function,
2187                 // since the photo data is transmitted in the status message as well
2188                 return true;
2189         }
2190
2191         /**
2192          * @brief Processes poll participations - unssupported
2193          *
2194          * @param array  $importer Array of the importer user
2195          * @param object $data     The message object
2196          *
2197          * @return bool always true
2198          */
2199         private static function receivePollParticipation(array $importer, $data)
2200         {
2201                 // We don't support polls by now
2202                 return true;
2203         }
2204
2205         /**
2206          * @brief Processes incoming profile updates
2207          *
2208          * @param array  $importer Array of the importer user
2209          * @param object $data     The message object
2210          *
2211          * @return bool Success
2212          */
2213         private static function receiveProfile(array $importer, $data)
2214         {
2215                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2216
2217                 $contact = self::contactByHandle($importer["uid"], $author);
2218                 if (!$contact) {
2219                         return false;
2220                 }
2221
2222                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2223                 $image_url = XML::unescape($data->image_url);
2224                 $birthday = XML::unescape($data->birthday);
2225                 $gender = XML::unescape($data->gender);
2226                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2227                 $location = Markdown::toBBCode(XML::unescape($data->location));
2228                 $searchable = (XML::unescape($data->searchable) == "true");
2229                 $nsfw = (XML::unescape($data->nsfw) == "true");
2230                 $tags = XML::unescape($data->tag_string);
2231
2232                 $tags = explode("#", $tags);
2233
2234                 $keywords = [];
2235                 foreach ($tags as $tag) {
2236                         $tag = trim(strtolower($tag));
2237                         if ($tag != "") {
2238                                 $keywords[] = $tag;
2239                         }
2240                 }
2241
2242                 $keywords = implode(", ", $keywords);
2243
2244                 $handle_parts = explode("@", $author);
2245                 $nick = $handle_parts[0];
2246
2247                 if ($name === "") {
2248                         $name = $handle_parts[0];
2249                 }
2250
2251                 if (preg_match("|^https?://|", $image_url) === 0) {
2252                         $image_url = "http://".$handle_parts[1].$image_url;
2253                 }
2254
2255                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2256
2257                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2258
2259                 $birthday = str_replace("1000", "1901", $birthday);
2260
2261                 if ($birthday != "") {
2262                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2263                 }
2264
2265                 // this is to prevent multiple birthday notifications in a single year
2266                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2267
2268                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2269                         $birthday = $contact["bd"];
2270                 }
2271
2272                 $fields = ['name' => $name, 'location' => $location,
2273                         'name-date' => DateTimeFormat::utcNow(),
2274                         'about' => $about, 'gender' => $gender,
2275                         'addr' => $author, 'nick' => $nick,
2276                         'keywords' => $keywords];
2277
2278                 if (!empty($birthday)) {
2279                         $fields['bd'] = $birthday;
2280                 }
2281
2282                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2283
2284                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2285                                         "photo" => $image_url, "name" => $name, "location" => $location,
2286                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2287                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2288                                         "hide" => !$searchable, "nsfw" => $nsfw];
2289
2290                 $gcid = GContact::update($gcontact);
2291
2292                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2293
2294                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2295
2296                 return true;
2297         }
2298
2299         /**
2300          * @brief Processes incoming friend requests
2301          *
2302          * @param array $importer Array of the importer user
2303          * @param array $contact  The contact that send the request
2304          * @return void
2305          */
2306         private static function receiveRequestMakeFriend(array $importer, array $contact)
2307         {
2308                 $a = get_app();
2309
2310                 if ($contact["rel"] == Contact::SHARING) {
2311                         DBA::update(
2312                                 'contact',
2313                                 ['rel' => Contact::FRIEND, 'writable' => true],
2314                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2315                         );
2316                 }
2317         }
2318
2319         /**
2320          * @brief Processes incoming sharing notification
2321          *
2322          * @param array  $importer Array of the importer user
2323          * @param object $data     The message object
2324          *
2325          * @return bool Success
2326          */
2327         private static function receiveContactRequest(array $importer, $data)
2328         {
2329                 $author = XML::unescape($data->author);
2330                 $recipient = XML::unescape($data->recipient);
2331
2332                 if (!$author || !$recipient) {
2333                         return false;
2334                 }
2335
2336                 // the current protocol version doesn't know these fields
2337                 // That means that we will assume their existance
2338                 if (isset($data->following)) {
2339                         $following = (XML::unescape($data->following) == "true");
2340                 } else {
2341                         $following = true;
2342                 }
2343
2344                 if (isset($data->sharing)) {
2345                         $sharing = (XML::unescape($data->sharing) == "true");
2346                 } else {
2347                         $sharing = true;
2348                 }
2349
2350                 $contact = self::contactByHandle($importer["uid"], $author);
2351
2352                 // perhaps we were already sharing with this person. Now they're sharing with us.
2353                 // That makes us friends.
2354                 if ($contact) {
2355                         if ($following) {
2356                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2357                                 self::receiveRequestMakeFriend($importer, $contact);
2358
2359                                 // refetch the contact array
2360                                 $contact = self::contactByHandle($importer["uid"], $author);
2361
2362                                 // If we are now friends, we are sending a share message.
2363                                 // Normally we needn't to do so, but the first message could have been vanished.
2364                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2365                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2366                                         if (DBA::isResult($user)) {
2367                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2368                                                 $ret = self::sendShare($user, $contact);
2369                                         }
2370                                 }
2371                                 return true;
2372                         } else {
2373                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2374                                 Contact::removeFollower($importer, $contact);
2375                                 return true;
2376                         }
2377                 }
2378
2379                 if (!$following && $sharing && in_array($importer["page-flags"], [Contact::PAGE_SOAPBOX, Contact::PAGE_NORMAL])) {
2380                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2381                         return false;
2382                 } elseif (!$following && !$sharing) {
2383                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2384                         return false;
2385                 } elseif (!$following && $sharing) {
2386                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2387                 } elseif ($following && $sharing) {
2388                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2389                 } elseif ($following && !$sharing) {
2390                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2391                 }
2392
2393                 $ret = self::personByHandle($author);
2394
2395                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2396                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2397                         return false;
2398                 }
2399
2400                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2401
2402                 $r = q(
2403                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2404                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2405                         intval($importer["uid"]),
2406                         DBA::escape($ret["network"]),
2407                         DBA::escape($ret["addr"]),
2408                         DateTimeFormat::utcNow(),
2409                         DBA::escape($ret["url"]),
2410                         DBA::escape(Strings::normaliseLink($ret["url"])),
2411                         DBA::escape($batch),
2412                         DBA::escape($ret["name"]),
2413                         DBA::escape($ret["nick"]),
2414                         DBA::escape($ret["photo"]),
2415                         DBA::escape($ret["pubkey"]),
2416                         DBA::escape($ret["notify"]),
2417                         DBA::escape($ret["poll"]),
2418                         1,
2419                         2
2420                 );
2421
2422                 // find the contact record we just created
2423
2424                 $contact_record = self::contactByHandle($importer["uid"], $author);
2425
2426                 if (!$contact_record) {
2427                         Logger::log("unable to locate newly created contact record.");
2428                         return;
2429                 }
2430
2431                 Logger::log("Author ".$author." was added as contact number ".$contact_record["id"].".", Logger::DEBUG);
2432
2433                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2434
2435                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2436
2437                 if (in_array($importer["page-flags"], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP])) {
2438                         Logger::log("Sending intra message for author ".$author.".", Logger::DEBUG);
2439
2440                         $hash = Strings::getRandomHex().(string)time();   // Generate a confirm_key
2441
2442                         $ret = q(
2443                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2444                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2445                                 intval($importer["uid"]),
2446                                 intval($contact_record["id"]),
2447                                 0,
2448                                 0,
2449                                 DBA::escape(L10n::t("Sharing notification from Diaspora network")),
2450                                 DBA::escape($hash),
2451                                 DBA::escape(DateTimeFormat::utcNow())
2452                         );
2453                 } else {
2454                         // automatic friend approval
2455
2456                         Logger::log("Does an automatic friend approval for author ".$author.".", Logger::DEBUG);
2457
2458                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2459
2460                         /*
2461                          * technically they are sharing with us (Contact::SHARING),
2462                          * but if our page-type is Profile::PAGE_COMMUNITY or Profile::PAGE_SOAPBOX
2463                          * we are going to change the relationship and make them a follower.
2464                          */
2465                         if (($importer["page-flags"] == Contact::PAGE_FREELOVE) && $sharing && $following) {
2466                                 $new_relation = Contact::FRIEND;
2467                         } elseif (($importer["page-flags"] == Contact::PAGE_FREELOVE) && $sharing) {
2468                                 $new_relation = Contact::SHARING;
2469                         } else {
2470                                 $new_relation = Contact::FOLLOWER;
2471                         }
2472
2473                         $r = q(
2474                                 "UPDATE `contact` SET `rel` = %d,
2475                                 `name-date` = '%s',
2476                                 `uri-date` = '%s',
2477                                 `blocked` = 0,
2478                                 `pending` = 0,
2479                                 `writable` = 1
2480                                 WHERE `id` = %d
2481                                 ",
2482                                 intval($new_relation),
2483                                 DBA::escape(DateTimeFormat::utcNow()),
2484                                 DBA::escape(DateTimeFormat::utcNow()),
2485                                 intval($contact_record["id"])
2486                         );
2487
2488                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2489                         if (DBA::isResult($user)) {
2490                                 Logger::log("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2491                                 $ret = self::sendShare($user, $contact_record);
2492
2493                                 // Send the profile data, maybe it weren't transmitted before
2494                                 self::sendProfile($importer["uid"], [$contact_record]);
2495                         }
2496                 }
2497
2498                 return true;
2499         }
2500
2501         /**
2502          * @brief Fetches a message with a given guid
2503          *
2504          * @param string $guid        message guid
2505          * @param string $orig_author handle of the original post
2506          * @param string $author      handle of the sharer
2507          *
2508          * @return array The fetched item
2509          */
2510         public static function originalItem($guid, $orig_author)
2511         {
2512                 if (empty($guid)) {
2513                         Logger::log('Empty guid. Quitting.');
2514                         return false;
2515                 }
2516
2517                 // Do we already have this item?
2518                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2519                         'author-name', 'author-link', 'author-avatar'];
2520                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2521                 $item = Item::selectFirst($fields, $condition);
2522
2523                 if (DBA::isResult($item)) {
2524                         Logger::log("reshared message ".$guid." already exists on system.");
2525
2526                         // Maybe it is already a reshared item?
2527                         // Then refetch the content, if it is a reshare from a reshare.
2528                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2529                         if (self::isReshare($item["body"], true)) {
2530                                 $item = [];
2531                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2532                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2533
2534                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2535
2536                                 // Add OEmbed and other information to the body
2537                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2538
2539                                 return $item;
2540                         } else {
2541                                 return $item;
2542                         }
2543                 }
2544
2545                 if (!DBA::isResult($item)) {
2546                         if (empty($orig_author)) {
2547                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2548                                 return false;
2549                         }
2550
2551                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2552                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2553                         $stored = self::storeByGuid($guid, $server);
2554
2555                         if (!$stored) {
2556                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2557                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2558                                 $stored = self::storeByGuid($guid, $server);
2559                         }
2560
2561                         if ($stored) {
2562                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2563                                         'author-name', 'author-link', 'author-avatar'];
2564                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2565                                 $item = Item::selectFirst($fields, $condition);
2566
2567                                 if (DBA::isResult($item)) {
2568                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2569                                         if (self::isReshare($item["body"], false)) {
2570                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2571                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2572                                         }
2573
2574                                         return $item;
2575                                 }
2576                         }
2577                 }
2578                 return false;
2579         }
2580
2581         /**
2582          * @brief Processes a reshare message
2583          *
2584          * @param array  $importer Array of the importer user
2585          * @param object $data     The message object
2586          * @param string $xml      The original XML of the message
2587          *
2588          * @return int the message id
2589          */
2590         private static function receiveReshare(array $importer, $data, $xml)
2591         {
2592                 $author = Strings::escapeTags(XML::unescape($data->author));
2593                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2594                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2595                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2596                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2597                 /// @todo handle unprocessed property "provider_display_name"
2598                 $public = Strings::escapeTags(XML::unescape($data->public));
2599
2600                 $contact = self::allowedContactByHandle($importer, $author, false);
2601                 if (!$contact) {
2602                         return false;
2603                 }
2604
2605                 $message_id = self::messageExists($importer["uid"], $guid);
2606                 if ($message_id) {
2607                         return true;
2608                 }
2609
2610                 $original_item = self::originalItem($root_guid, $root_author);
2611                 if (!$original_item) {
2612                         return false;
2613                 }
2614
2615                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2616
2617                 $datarray = [];
2618
2619                 $datarray["uid"] = $importer["uid"];
2620                 $datarray["contact-id"] = $contact["id"];
2621                 $datarray["network"]  = Protocol::DIASPORA;
2622
2623                 $datarray["author-link"] = $contact["url"];
2624                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2625
2626                 $datarray["owner-link"] = $datarray["author-link"];
2627                 $datarray["owner-id"] = $datarray["author-id"];
2628
2629                 $datarray["guid"] = $guid;
2630                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2631
2632                 $datarray["verb"] = ACTIVITY_POST;
2633                 $datarray["gravity"] = GRAVITY_PARENT;
2634
2635                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2636                 $datarray["source"] = $xml;
2637
2638                 $prefix = share_header(
2639                         $original_item["author-name"],
2640                         $original_item["author-link"],
2641                         $original_item["author-avatar"],
2642                         $original_item["guid"],
2643                         $original_item["created"],
2644                         $orig_url
2645                 );
2646                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2647
2648                 $datarray["tag"] = $original_item["tag"];
2649                 $datarray["app"]  = $original_item["app"];
2650
2651                 $datarray["plink"] = self::plink($author, $guid);
2652                 $datarray["private"] = (($public == "false") ? 1 : 0);
2653                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2654
2655                 $datarray["object-type"] = $original_item["object-type"];
2656
2657                 self::fetchGuid($datarray);
2658                 $message_id = Item::insert($datarray);
2659
2660                 self::sendParticipation($contact, $datarray);
2661
2662                 if ($message_id) {
2663                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2664                         if ($datarray['uid'] == 0) {
2665                                 Item::distribute($message_id);
2666                         }
2667                         return true;
2668                 } else {
2669                         return false;
2670                 }
2671         }
2672
2673         /**
2674          * @brief Processes retractions
2675          *
2676          * @param array  $importer Array of the importer user
2677          * @param array  $contact  The contact of the item owner
2678          * @param object $data     The message object
2679          *
2680          * @return bool success
2681          */
2682         private static function itemRetraction(array $importer, array $contact, $data)
2683         {
2684                 $author = Strings::escapeTags(XML::unescape($data->author));
2685                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2686                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2687
2688                 $person = self::personByHandle($author);
2689                 if (!is_array($person)) {
2690                         Logger::log("unable to find author detail for ".$author);
2691                         return false;
2692                 }
2693
2694                 if (empty($contact["url"])) {
2695                         $contact["url"] = $person["url"];
2696                 }
2697
2698                 // Fetch items that are about to be deleted
2699                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2700
2701                 // When we receive a public retraction, we delete every item that we find.
2702                 if ($importer['uid'] == 0) {
2703                         $condition = ['guid' => $target_guid, 'deleted' => false];
2704                 } else {
2705                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2706                 }
2707
2708                 $r = Item::select($fields, $condition);
2709                 if (!DBA::isResult($r)) {
2710                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2711                         return false;
2712                 }
2713
2714                 while ($item = Item::fetch($r)) {
2715                         if (strstr($item['file'], '[')) {
2716                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2717                                 continue;
2718                         }
2719
2720                         // Fetch the parent item
2721                         $parent = Item::selectFirst(['author-link'], ['id' => $item["parent"]]);
2722
2723                         // Only delete it if the parent author really fits
2724                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2725                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2726                                 continue;
2727                         }
2728
2729                         Item::delete(['id' => $item['id']]);
2730
2731                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], Logger::DEBUG);
2732                 }
2733
2734                 return true;
2735         }
2736
2737         /**
2738          * @brief Receives retraction messages
2739          *
2740          * @param array  $importer Array of the importer user
2741          * @param string $sender   The sender of the message
2742          * @param object $data     The message object
2743          *
2744          * @return bool Success
2745          */
2746         private static function receiveRetraction(array $importer, $sender, $data)
2747         {
2748                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2749
2750                 $contact = self::contactByHandle($importer["uid"], $sender);
2751                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2752                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2753                         return false;
2754                 }
2755
2756                 if (!$contact) {
2757                         $contact = [];
2758                 }
2759
2760                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2761
2762                 switch ($target_type) {
2763                         case "Comment":
2764                         case "Like":
2765                         case "Post":
2766                         case "Reshare":
2767                         case "StatusMessage":
2768                                 return self::itemRetraction($importer, $contact, $data);
2769
2770                         case "PollParticipation":
2771                         case "Photo":
2772                                 // Currently unsupported
2773                                 break;
2774
2775                         default:
2776                                 Logger::log("Unknown target type ".$target_type);
2777                                 return false;
2778                 }
2779                 return true;
2780         }
2781
2782         /**
2783          * @brief Receives status messages
2784          *
2785          * @param array  $importer Array of the importer user
2786          * @param object $data     The message object
2787          * @param string $xml      The original XML of the message
2788          *
2789          * @return int The message id of the newly created item
2790          */
2791         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2792         {
2793                 $author = Strings::escapeTags(XML::unescape($data->author));
2794                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2795                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2796                 $public = Strings::escapeTags(XML::unescape($data->public));
2797                 $text = XML::unescape($data->text);
2798                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2799
2800                 $contact = self::allowedContactByHandle($importer, $author, false);
2801                 if (!$contact) {
2802                         return false;
2803                 }
2804
2805                 $message_id = self::messageExists($importer["uid"], $guid);
2806                 if ($message_id) {
2807                         return true;
2808                 }
2809
2810                 $address = [];
2811                 if ($data->location) {
2812                         foreach ($data->location->children() as $fieldname => $data) {
2813                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2814                         }
2815                 }
2816
2817                 $body = Markdown::toBBCode($text);
2818
2819                 $datarray = [];
2820
2821                 // Attach embedded pictures to the body
2822                 if ($data->photo) {
2823                         foreach ($data->photo as $photo) {
2824                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2825                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2826                         }
2827
2828                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2829                 } else {
2830                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2831
2832                         // Add OEmbed and other information to the body
2833                         if (!self::isRedmatrix($contact["url"])) {
2834                                 $body = add_page_info_to_body($body, false, true);
2835                         }
2836                 }
2837
2838                 /// @todo enable support for polls
2839                 //if ($data->poll) {
2840                 //      foreach ($data->poll AS $poll)
2841                 //              print_r($poll);
2842                 //      die("poll!\n");
2843                 //}
2844
2845                 /// @todo enable support for events
2846
2847                 $datarray["uid"] = $importer["uid"];
2848                 $datarray["contact-id"] = $contact["id"];
2849                 $datarray["network"] = Protocol::DIASPORA;
2850
2851                 $datarray["author-link"] = $contact["url"];
2852                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2853
2854                 $datarray["owner-link"] = $datarray["author-link"];
2855                 $datarray["owner-id"] = $datarray["author-id"];
2856
2857                 $datarray["guid"] = $guid;
2858                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2859
2860                 $datarray["verb"] = ACTIVITY_POST;
2861                 $datarray["gravity"] = GRAVITY_PARENT;
2862
2863                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2864                 $datarray["source"] = $xml;
2865
2866                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2867
2868                 if ($provider_display_name != "") {
2869                         $datarray["app"] = $provider_display_name;
2870                 }
2871
2872                 $datarray["plink"] = self::plink($author, $guid);
2873                 $datarray["private"] = (($public == "false") ? 1 : 0);
2874                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2875
2876                 if (isset($address["address"])) {
2877                         $datarray["location"] = $address["address"];
2878                 }
2879
2880                 if (isset($address["lat"]) && isset($address["lng"])) {
2881                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2882                 }
2883
2884                 self::fetchGuid($datarray);
2885                 $message_id = Item::insert($datarray);
2886
2887                 self::sendParticipation($contact, $datarray);
2888
2889                 if ($message_id) {
2890                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2891                         if ($datarray['uid'] == 0) {
2892                                 Item::distribute($message_id);
2893                         }
2894                         return true;
2895                 } else {
2896                         return false;
2897                 }
2898         }
2899
2900         /* ************************************************************************************** *
2901          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2902          * ************************************************************************************** */
2903
2904         /**
2905          * @brief returnes the handle of a contact
2906          *
2907          * @param array $contact contact array
2908          *
2909          * @return string the handle in the format user@domain.tld
2910          */
2911         private static function myHandle(array $contact)
2912         {
2913                 if (!empty($contact["addr"])) {
2914                         return $contact["addr"];
2915                 }
2916
2917                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2918                 // So - just in case - we build the the address here.
2919                 if ($contact["nickname"] != "") {
2920                         $nick = $contact["nickname"];
2921                 } else {
2922                         $nick = $contact["nick"];
2923                 }
2924
2925                 return $nick . "@" . substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
2926         }
2927
2928
2929         /**
2930          * @brief Creates the data for a private message in the new format
2931          *
2932          * @param string $msg     The message that is to be transmitted
2933          * @param array  $user    The record of the sender
2934          * @param array  $contact Target of the communication
2935          * @param string $prvkey  The private key of the sender
2936          * @param string $pubkey  The public key of the receiver
2937          *
2938          * @return string The encrypted data
2939          */
2940         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2941         {
2942                 Logger::log("Message: ".$msg, Logger::DATA);
2943
2944                 // without a public key nothing will work
2945                 if (!$pubkey) {
2946                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
2947                         return false;
2948                 }
2949
2950                 $aes_key = openssl_random_pseudo_bytes(32);
2951                 $b_aes_key = base64_encode($aes_key);
2952                 $iv = openssl_random_pseudo_bytes(16);
2953                 $b_iv = base64_encode($iv);
2954
2955                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
2956
2957                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
2958
2959                 $encrypted_key_bundle = "";
2960                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
2961
2962                 $json_object = json_encode(
2963                         ["aes_key" => base64_encode($encrypted_key_bundle),
2964                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
2965                 );
2966
2967                 return $json_object;
2968         }
2969
2970         /**
2971          * @brief Creates the envelope for the "fetch" endpoint and for the new format
2972          *
2973          * @param string $msg  The message that is to be transmitted
2974          * @param array  $user The record of the sender
2975          *
2976          * @return string The envelope
2977          */
2978         public static function buildMagicEnvelope($msg, array $user)
2979         {
2980                 $b64url_data = Strings::base64UrlEncode($msg);
2981                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
2982
2983                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
2984                 $type = "application/xml";
2985                 $encoding = "base64url";
2986                 $alg = "RSA-SHA256";
2987                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
2988
2989                 // Fallback if the private key wasn't transmitted in the expected field
2990                 if ($user['uprvkey'] == "") {
2991                         $user['uprvkey'] = $user['prvkey'];
2992                 }
2993
2994                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
2995                 $sig = Strings::base64UrlEncode($signature);
2996
2997                 $xmldata = ["me:env" => ["me:data" => $data,
2998                                                         "@attributes" => ["type" => $type],
2999                                                         "me:encoding" => $encoding,
3000                                                         "me:alg" => $alg,
3001                                                         "me:sig" => $sig,
3002                                                         "@attributes2" => ["key_id" => $key_id]]];
3003
3004                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3005
3006                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3007         }
3008
3009         /**
3010          * @brief Create the envelope for a message
3011          *
3012          * @param string $msg     The message that is to be transmitted
3013          * @param array  $user    The record of the sender
3014          * @param array  $contact Target of the communication
3015          * @param string $prvkey  The private key of the sender
3016          * @param string $pubkey  The public key of the receiver
3017          * @param bool   $public  Is the message public?
3018          *
3019          * @return string The message that will be transmitted to other servers
3020          */
3021         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3022         {
3023                 // The message is put into an envelope with the sender's signature
3024                 $envelope = self::buildMagicEnvelope($msg, $user);
3025
3026                 // Private messages are put into a second envelope, encrypted with the receivers public key
3027                 if (!$public) {
3028                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3029                 }
3030
3031                 return $envelope;
3032         }
3033
3034         /**
3035          * @brief Creates a signature for a message
3036          *
3037          * @param array $owner   the array of the owner of the message
3038          * @param array $message The message that is to be signed
3039          *
3040          * @return string The signature
3041          */
3042         private static function signature($owner, $message)
3043         {
3044                 $sigmsg = $message;
3045                 unset($sigmsg["author_signature"]);
3046                 unset($sigmsg["parent_author_signature"]);
3047
3048                 $signed_text = implode(";", $sigmsg);
3049
3050                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3051         }
3052
3053         /**
3054          * @brief Transmit a message to a target server
3055          *
3056          * @param array  $owner        the array of the item owner
3057          * @param array  $contact      Target of the communication
3058          * @param string $envelope     The message that is to be transmitted
3059          * @param bool   $public_batch Is it a public post?
3060          * @param bool   $queue_run    Is the transmission called from the queue?
3061          * @param string $guid         message guid
3062          *
3063          * @return int Result of the transmission
3064          */
3065         public static function transmit(array $owner, array $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
3066         {
3067                 $a = get_app();
3068
3069                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3070                 if (!$enabled) {
3071                         return 200;
3072                 }
3073
3074                 $logid = Strings::getRandomHex(4);
3075
3076                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3077
3078                 // We always try to use the data from the fcontact table.
3079                 // This is important for transmitting data to Friendica servers.
3080                 if (!empty($contact['addr'])) {
3081                         $fcontact = self::personByHandle($contact['addr']);
3082                         if (!empty($fcontact)) {
3083                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3084                         }
3085                 }
3086
3087                 if (!$dest_url) {
3088                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3089                         return 0;
3090                 }
3091
3092                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3093
3094                 if (!$queue_run && Queue::wasDelayed($contact["id"])) {
3095                         $return_code = 0;
3096                 } else {
3097                         if (!intval(Config::get("system", "diaspora_test"))) {
3098                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3099
3100                                 $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3101                                 $return_code = $postResult->getReturnCode();
3102                         } else {
3103                                 Logger::log("test_mode");
3104                                 return 200;
3105                         }
3106                 }
3107
3108                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3109
3110                 if (!$return_code || (($return_code == 503) && (stristr($postResult->getHeader(), "retry-after")))) {
3111                         if (!$no_queue && !empty($contact['contact-type']) && ($contact['contact-type'] != Contact::ACCOUNT_TYPE_RELAY)) {
3112                                 Logger::log("queue message");
3113                                 // queue message for redelivery
3114                                 Queue::add($contact["id"], Protocol::DIASPORA, $envelope, $public_batch, $guid);
3115                         }
3116
3117                         // The message could not be delivered. We mark the contact as "dead"
3118                         Contact::markForArchival($contact);
3119                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3120                         // We successfully delivered a message, the contact is alive
3121                         Contact::unmarkForArchival($contact);
3122                 }
3123
3124                 return $return_code ? $return_code : -1;
3125         }
3126
3127
3128         /**
3129          * @brief Build the post xml
3130          *
3131          * @param string $type    The message type
3132          * @param array  $message The message data
3133          *
3134          * @return string The post XML
3135          */
3136         public static function buildPostXml($type, $message)
3137         {
3138                 $data = [$type => $message];
3139
3140                 return XML::fromArray($data, $xml);
3141         }
3142
3143         /**
3144          * @brief Builds and transmit messages
3145          *
3146          * @param array  $owner        the array of the item owner
3147          * @param array  $contact      Target of the communication
3148          * @param string $type         The message type
3149          * @param array  $message      The message data
3150          * @param bool   $public_batch Is it a public post?
3151          * @param string $guid         message guid
3152          * @param bool   $spool        Should the transmission be spooled or transmitted?
3153          *
3154          * @return int Result of the transmission
3155          */
3156         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3157         {
3158                 $msg = self::buildPostXml($type, $message);
3159
3160                 Logger::log('message: '.$msg, Logger::DATA);
3161                 Logger::log('send guid '.$guid, Logger::DEBUG);
3162
3163                 // Fallback if the private key wasn't transmitted in the expected field
3164                 if (empty($owner['uprvkey'])) {
3165                         $owner['uprvkey'] = $owner['prvkey'];
3166                 }
3167
3168                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3169
3170                 if ($spool) {
3171                         Queue::add($contact['id'], Protocol::DIASPORA, $envelope, $public_batch, $guid);
3172                         return true;
3173                 } else {
3174                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3175                 }
3176
3177                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3178
3179                 return $return_code;
3180         }
3181
3182         /**
3183          * @brief sends a participation (Used to get all further updates)
3184          *
3185          * @param array $contact Target of the communication
3186          * @param array $item    Item array
3187          *
3188          * @return int The result of the transmission
3189          */
3190         private static function sendParticipation(array $contact, array $item)
3191         {
3192                 // Don't send notifications for private postings
3193                 if ($item['private']) {
3194                         return;
3195                 }
3196
3197                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3198
3199                 $result = Cache::get($cachekey);
3200                 if (!is_null($result)) {
3201                         return;
3202                 }
3203
3204                 // Fetch some user id to have a valid handle to transmit the participation.
3205                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3206                 // If the item belongs to a user, we take this user id.
3207                 if ($item['uid'] == 0) {
3208                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3209                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3210                         $owner = User::getOwnerDataById($first_user['uid']);
3211                 } else {
3212                         $owner = User::getOwnerDataById($item['uid']);
3213                 }
3214
3215                 $author = self::myHandle($owner);
3216
3217                 $message = ["author" => $author,
3218                                 "guid" => System::createUUID(),
3219                                 "parent_type" => "Post",
3220                                 "parent_guid" => $item["guid"]];
3221
3222                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3223
3224                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3225                 Cache::set($cachekey, $item["guid"], Cache::QUARTER_HOUR);
3226
3227                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3228         }
3229
3230         /**
3231          * @brief sends an account migration
3232          *
3233          * @param array $owner   the array of the item owner
3234          * @param array $contact Target of the communication
3235          * @param int   $uid     User ID
3236          *
3237          * @return int The result of the transmission
3238          */
3239         public static function sendAccountMigration(array $owner, array $contact, $uid)
3240         {
3241                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3242                 $profile = self::createProfileData($uid);
3243
3244                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3245                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3246
3247                 $message = ["author" => $old_handle,
3248                                 "profile" => $profile,
3249                                 "signature" => $signature];
3250
3251                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3252
3253                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3254         }
3255
3256         /**
3257          * @brief Sends a "share" message
3258          *
3259          * @param array $owner   the array of the item owner
3260          * @param array $contact Target of the communication
3261          *
3262          * @return int The result of the transmission
3263          */
3264         public static function sendShare(array $owner, array $contact)
3265         {
3266                 /**
3267                  * @todo support the different possible combinations of "following" and "sharing"
3268                  * Currently, Diaspora only interprets the "sharing" field
3269                  *
3270                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3271                  */
3272
3273                 /*
3274                 switch ($contact["rel"]) {
3275                         case Contact::FRIEND:
3276                                 $following = true;
3277                                 $sharing = true;
3278
3279                         case Contact::SHARING:
3280                                 $following = false;
3281                                 $sharing = true;
3282
3283                         case Contact::FOLLOWER:
3284                                 $following = true;
3285                                 $sharing = false;
3286                 }
3287                 */
3288
3289                 $message = ["author" => self::myHandle($owner),
3290                                 "recipient" => $contact["addr"],
3291                                 "following" => "true",
3292                                 "sharing" => "true"];
3293
3294                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3295
3296                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3297         }
3298
3299         /**
3300          * @brief sends an "unshare"
3301          *
3302          * @param array $owner   the array of the item owner
3303          * @param array $contact Target of the communication
3304          *
3305          * @return int The result of the transmission
3306          */
3307         public static function sendUnshare(array $owner, array $contact)
3308         {
3309                 $message = ["author" => self::myHandle($owner),
3310                                 "recipient" => $contact["addr"],
3311                                 "following" => "false",
3312                                 "sharing" => "false"];
3313
3314                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3315
3316                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3317         }
3318
3319         /**
3320          * @brief Checks a message body if it is a reshare
3321          *
3322          * @param string $body     The message body that is to be check
3323          * @param bool   $complete Should it be a complete check or a simple check?
3324          *
3325          * @return array|bool Reshare details or "false" if no reshare
3326          */
3327         public static function isReshare($body, $complete = true)
3328         {
3329                 $body = trim($body);
3330
3331                 // Skip if it isn't a pure repeated messages
3332                 // Does it start with a share?
3333                 if ((strpos($body, "[share") > 0) && $complete) {
3334                         return false;
3335                 }
3336
3337                 // Does it end with a share?
3338                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3339                         return false;
3340                 }
3341
3342                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3343                 // Skip if there is no shared message in there
3344                 if ($body == $attributes) {
3345                         return false;
3346                 }
3347
3348                 // If we don't do the complete check we quit here
3349
3350                 $guid = "";
3351                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3352                 if (!empty($matches[1])) {
3353                         $guid = $matches[1];
3354                 }
3355
3356                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3357                 if (!empty($matches[1])) {
3358                         $guid = $matches[1];
3359                 }
3360
3361                 if (($guid != "") && $complete) {
3362                         $condition = ['guid' => $guid, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3363                         $item = Item::selectFirst(['contact-id'], $condition);
3364                         if (DBA::isResult($item)) {
3365                                 $ret= [];
3366                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3367                                 $ret["root_guid"] = $guid;
3368                                 return $ret;
3369                         } elseif ($complete) {
3370                                 // We are resharing something that isn't a DFRN or Diaspora post.
3371                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3372                                 return false;
3373                         }
3374                 } elseif (($guid == "") && $complete) {
3375                         return false;
3376                 }
3377
3378                 $ret["root_guid"] = $guid;
3379
3380                 $profile = "";
3381                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3382                 if (!empty($matches[1])) {
3383                         $profile = $matches[1];
3384                 }
3385
3386                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3387                 if (!empty($matches[1])) {
3388                         $profile = $matches[1];
3389                 }
3390
3391                 $ret= [];
3392
3393                 if ($profile != "") {
3394                         if (Contact::getIdForURL($profile)) {
3395                                 $author = Contact::getDetailsByURL($profile);
3396                                 $ret["root_handle"] = $author['addr'];
3397                         }
3398                 }
3399
3400                 if (empty($ret) && !$complete) {
3401                         return true;
3402                 }
3403
3404                 return $ret;
3405         }
3406
3407         /**
3408          * @brief Create an event array
3409          *
3410          * @param integer $event_id The id of the event
3411          *
3412          * @return array with event data
3413          */
3414         private static function buildEvent($event_id)
3415         {
3416                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3417                 if (!DBA::isResult($r)) {
3418                         return [];
3419                 }
3420
3421                 $event = $r[0];
3422
3423                 $eventdata = [];
3424
3425                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3426                 if (!DBA::isResult($r)) {
3427                         return [];
3428                 }
3429
3430                 $user = $r[0];
3431
3432                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3433                 if (!DBA::isResult($r)) {
3434                         return [];
3435                 }
3436
3437                 $owner = $r[0];
3438
3439                 $eventdata['author'] = self::myHandle($owner);
3440
3441                 if ($event['guid']) {
3442                         $eventdata['guid'] = $event['guid'];
3443                 }
3444
3445                 $mask = DateTimeFormat::ATOM;
3446
3447                 /// @todo - establish "all day" events in Friendica
3448                 $eventdata["all_day"] = "false";
3449
3450                 $eventdata['timezone'] = 'UTC';
3451                 if (!$event['adjust'] && $user['timezone']) {
3452                         $eventdata['timezone'] = $user['timezone'];
3453                 }
3454
3455                 if ($event['start']) {
3456                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3457                 }
3458                 if ($event['finish'] && !$event['nofinish']) {
3459                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3460                 }
3461                 if ($event['summary']) {
3462                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3463                 }
3464                 if ($event['desc']) {
3465                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3466                 }
3467                 if ($event['location']) {
3468                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3469                         $coord = Map::getCoordinates($event['location']);
3470
3471                         $location = [];
3472                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3473                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3474                                 $location["lat"] = $coord['lat'];
3475                                 $location["lng"] = $coord['lon'];
3476                         } else {
3477                                 $location["lat"] = 0;
3478                                 $location["lng"] = 0;
3479                         }
3480                         $eventdata['location'] = $location;
3481                 }
3482
3483                 return $eventdata;
3484         }
3485
3486         /**
3487          * @brief Create a post (status message or reshare)
3488          *
3489          * @param array $item  The item that will be exported
3490          * @param array $owner the array of the item owner
3491          *
3492          * @return array
3493          * 'type' -> Message type ("status_message" or "reshare")
3494          * 'message' -> Array of XML elements of the status
3495          */
3496         public static function buildStatus(array $item, array $owner)
3497         {
3498                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3499
3500                 $result = Cache::get($cachekey);
3501                 if (!is_null($result)) {
3502                         return $result;
3503                 }
3504
3505                 $myaddr = self::myHandle($owner);
3506
3507                 $public = ($item["private"] ? "false" : "true");
3508
3509                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3510
3511                 // Detect a share element and do a reshare
3512                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3513                         $message = ["author" => $myaddr,
3514                                         "guid" => $item["guid"],
3515                                         "created_at" => $created,
3516                                         "root_author" => $ret["root_handle"],
3517                                         "root_guid" => $ret["root_guid"],
3518                                         "provider_display_name" => $item["app"],
3519                                         "public" => $public];
3520
3521                         $type = "reshare";
3522                 } else {
3523                         $title = $item["title"];
3524                         $body = $item["body"];
3525
3526                         if ($item['author-link'] != $item['owner-link']) {
3527                                 require_once 'mod/share.php';
3528                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3529                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3530                         }
3531
3532                         // convert to markdown
3533                         $body = html_entity_decode(BBCode::toMarkdown($body));
3534
3535                         // Adding the title
3536                         if (strlen($title)) {
3537                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3538                         }
3539
3540                         if ($item["attach"]) {
3541                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3542                                 if ($cnt) {
3543                                         $body .= "\n".L10n::t("Attachments:")."\n";
3544                                         foreach ($matches as $mtch) {
3545                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3546                                         }
3547                                 }
3548                         }
3549
3550                         $location = [];
3551
3552                         if ($item["location"] != "")
3553                                 $location["address"] = $item["location"];
3554
3555                         if ($item["coord"] != "") {
3556                                 $coord = explode(" ", $item["coord"]);
3557                                 $location["lat"] = $coord[0];
3558                                 $location["lng"] = $coord[1];
3559                         }
3560
3561                         $message = ["author" => $myaddr,
3562                                         "guid" => $item["guid"],
3563                                         "created_at" => $created,
3564                                         "public" => $public,
3565                                         "text" => $body,
3566                                         "provider_display_name" => $item["app"],
3567                                         "location" => $location];
3568
3569                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3570                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3571                                 unset($message["location"]);
3572                         }
3573
3574                         if ($item['event-id'] > 0) {
3575                                 $event = self::buildEvent($item['event-id']);
3576                                 if (count($event)) {
3577                                         $message['event'] = $event;
3578
3579                                         if (!empty($event['location']['address']) &&
3580                                                 !empty($event['location']['lat']) &&
3581                                                 !empty($event['location']['lng'])) {
3582                                                 $message['location'] = $event['location'];
3583                                         }
3584
3585                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3586                                         // $message['text'] = '';
3587                                 }
3588                         }
3589
3590                         $type = "status_message";
3591                 }
3592
3593                 $msg = ["type" => $type, "message" => $message];
3594
3595                 Cache::set($cachekey, $msg, Cache::QUARTER_HOUR);
3596
3597                 return $msg;
3598         }
3599
3600         /**
3601          * @brief Sends a post
3602          *
3603          * @param array $item         The item that will be exported
3604          * @param array $owner        the array of the item owner
3605          * @param array $contact      Target of the communication
3606          * @param bool  $public_batch Is it a public post?
3607          *
3608          * @return int The result of the transmission
3609          */
3610         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3611         {
3612                 $status = self::buildStatus($item, $owner);
3613
3614                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3615         }
3616
3617         /**
3618          * @brief Creates a "like" object
3619          *
3620          * @param array $item  The item that will be exported
3621          * @param array $owner the array of the item owner
3622          *
3623          * @return array The data for a "like"
3624          */
3625         private static function constructLike(array $item, array $owner)
3626         {
3627                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3628                 if (!DBA::isResult($parent)) {
3629                         return false;
3630                 }
3631
3632                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3633                 $positive = null;
3634                 if ($item['verb'] === ACTIVITY_LIKE) {
3635                         $positive = "true";
3636                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3637                         $positive = "false";
3638                 }
3639
3640                 return(["author" => self::myHandle($owner),
3641                                 "guid" => $item["guid"],
3642                                 "parent_guid" => $parent["guid"],
3643                                 "parent_type" => $target_type,
3644                                 "positive" => $positive,
3645                                 "author_signature" => ""]);
3646         }
3647
3648         /**
3649          * @brief Creates an "EventParticipation" object
3650          *
3651          * @param array $item  The item that will be exported
3652          * @param array $owner the array of the item owner
3653          *
3654          * @return array The data for an "EventParticipation"
3655          */
3656         private static function constructAttend(array $item, array $owner)
3657         {
3658                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3659                 if (!DBA::isResult($parent)) {
3660                         return false;
3661                 }
3662
3663                 switch ($item['verb']) {
3664                         case ACTIVITY_ATTEND:
3665                                 $attend_answer = 'accepted';
3666                                 break;
3667                         case ACTIVITY_ATTENDNO:
3668                                 $attend_answer = 'declined';
3669                                 break;
3670                         case ACTIVITY_ATTENDMAYBE:
3671                                 $attend_answer = 'tentative';
3672                                 break;
3673                         default:
3674                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3675                                 return false;
3676                 }
3677
3678                 return(["author" => self::myHandle($owner),
3679                                 "guid" => $item["guid"],
3680                                 "parent_guid" => $parent["guid"],
3681                                 "status" => $attend_answer,
3682                                 "author_signature" => ""]);
3683         }
3684
3685         /**
3686          * @brief Creates the object for a comment
3687          *
3688          * @param array $item  The item that will be exported
3689          * @param array $owner the array of the item owner
3690          *
3691          * @return array The data for a comment
3692          */
3693         private static function constructComment(array $item, array $owner)
3694         {
3695                 $cachekey = "diaspora:constructComment:".$item['guid'];
3696
3697                 $result = Cache::get($cachekey);
3698                 if (!is_null($result)) {
3699                         return $result;
3700                 }
3701
3702                 $parent = Item::selectFirst(['guid'], ['id' => $item["parent"], 'parent' => $item["parent"]]);
3703                 if (!DBA::isResult($parent)) {
3704                         return false;
3705                 }
3706
3707                 $text = html_entity_decode(BBCode::toMarkdown($item["body"]));
3708                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3709
3710                 $comment = ["author" => self::myHandle($owner),
3711                                 "guid" => $item["guid"],
3712                                 "created_at" => $created,
3713                                 "parent_guid" => $parent["guid"],
3714                                 "text" => $text,
3715                                 "author_signature" => ""];
3716
3717                 // Send the thread parent guid only if it is a threaded comment
3718                 if ($item['thr-parent'] != $item['parent-uri']) {
3719                         $comment['thread_parent_guid'] = self::getGuidFromUri($item['thr-parent'], $item['uid']);
3720                 }
3721
3722                 Cache::set($cachekey, $comment, Cache::QUARTER_HOUR);
3723
3724                 return($comment);
3725         }
3726
3727         /**
3728          * @brief Send a like or a comment
3729          *
3730          * @param array $item         The item that will be exported
3731          * @param array $owner        the array of the item owner
3732          * @param array $contact      Target of the communication
3733          * @param bool  $public_batch Is it a public post?
3734          *
3735          * @return int The result of the transmission
3736          */
3737         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3738         {
3739                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3740                         $message = self::constructAttend($item, $owner);
3741                         $type = "event_participation";
3742                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3743                         $message = self::constructLike($item, $owner);
3744                         $type = "like";
3745                 } elseif (!in_array($item["verb"], [ACTIVITY_FOLLOW])) {
3746                         $message = self::constructComment($item, $owner);
3747                         $type = "comment";
3748                 }
3749
3750                 if (empty($message)) {
3751                         return false;
3752                 }
3753
3754                 $message["author_signature"] = self::signature($owner, $message);
3755
3756                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3757         }
3758
3759         /**
3760          * @brief Creates a message from a signature record entry
3761          *
3762          * @param array $item      The item that will be exported
3763          * @param array $signature The entry of the "sign" record
3764          *
3765          * @return string The message
3766          */
3767         private static function messageFromSignature(array $item)
3768         {
3769                 // Split the signed text
3770                 $signed_parts = explode(";", $item['signed_text']);
3771
3772                 if ($item["deleted"]) {
3773                         $message = ["author" => $item['signer'],
3774                                         "target_guid" => $signed_parts[0],
3775                                         "target_type" => $signed_parts[1]];
3776                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3777                         $message = ["author" => $signed_parts[4],
3778                                         "guid" => $signed_parts[1],
3779                                         "parent_guid" => $signed_parts[3],
3780                                         "parent_type" => $signed_parts[2],
3781                                         "positive" => $signed_parts[0],
3782                                         "author_signature" => $item['signature'],
3783                                         "parent_author_signature" => ""];
3784                 } else {
3785                         // Remove the comment guid
3786                         $guid = array_shift($signed_parts);
3787
3788                         // Remove the parent guid
3789                         $parent_guid = array_shift($signed_parts);
3790
3791                         // Remove the handle
3792                         $handle = array_pop($signed_parts);
3793
3794                         // Glue the parts together
3795                         $text = implode(";", $signed_parts);
3796
3797                         $message = ["author" => $handle,
3798                                         "guid" => $guid,
3799                                         "parent_guid" => $parent_guid,
3800                                         "text" => implode(";", $signed_parts),
3801                                         "author_signature" => $item['signature'],
3802                                         "parent_author_signature" => ""];
3803                 }
3804                 return $message;
3805         }
3806
3807         /**
3808          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3809          *
3810          * @param array $item         The item that will be exported
3811          * @param array $owner        the array of the item owner
3812          * @param array $contact      Target of the communication
3813          * @param bool  $public_batch Is it a public post?
3814          *
3815          * @return int The result of the transmission
3816          */
3817         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3818         {
3819                 if ($item["deleted"]) {
3820                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3821                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3822                         $type = "like";
3823                 } else {
3824                         $type = "comment";
3825                 }
3826
3827                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3828
3829                 // Old way - is used by the internal Friendica functions
3830                 /// @todo Change all signatur storing functions to the new format
3831                 if ($item['signed_text'] && $item['signature'] && $item['signer']) {
3832                         $message = self::messageFromSignature($item);
3833                 } else {// New way
3834                         $msg = json_decode($item['signed_text'], true);
3835
3836                         $message = [];
3837                         if (is_array($msg)) {
3838                                 foreach ($msg as $field => $data) {
3839                                         if (!$item["deleted"]) {
3840                                                 if ($field == "diaspora_handle") {
3841                                                         $field = "author";
3842                                                 }
3843                                                 if ($field == "target_type") {
3844                                                         $field = "parent_type";
3845                                                 }
3846                                         }
3847
3848                                         $message[$field] = $data;
3849                                 }
3850                         } else {
3851                                 Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3852                         }
3853                 }
3854
3855                 $message["parent_author_signature"] = self::signature($owner, $message);
3856
3857                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
3858
3859                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3860         }
3861
3862         /**
3863          * @brief Sends a retraction (deletion) of a message, like or comment
3864          *
3865          * @param array $item         The item that will be exported
3866          * @param array $owner        the array of the item owner
3867          * @param array $contact      Target of the communication
3868          * @param bool  $public_batch Is it a public post?
3869          * @param bool  $relay        Is the retraction transmitted from a relay?
3870          *
3871          * @return int The result of the transmission
3872          */
3873         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3874         {
3875                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3876
3877                 $msg_type = "retraction";
3878
3879                 if ($item['id'] == $item['parent']) {
3880                         $target_type = "Post";
3881                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3882                         $target_type = "Like";
3883                 } else {
3884                         $target_type = "Comment";
3885                 }
3886
3887                 $message = ["author" => $itemaddr,
3888                                 "target_guid" => $item['guid'],
3889                                 "target_type" => $target_type];
3890
3891                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
3892
3893                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3894         }
3895
3896         /**
3897          * @brief Sends a mail
3898          *
3899          * @param array $item    The item that will be exported
3900          * @param array $owner   The owner
3901          * @param array $contact Target of the communication
3902          *
3903          * @return int The result of the transmission
3904          */
3905         public static function sendMail(array $item, array $owner, array $contact)
3906         {
3907                 $myaddr = self::myHandle($owner);
3908
3909                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
3910                 if (!DBA::isResult($cnv)) {
3911                         Logger::log("conversation not found.");
3912                         return;
3913                 }
3914
3915                 $conv = [
3916                         "author" => $cnv["creator"],
3917                         "guid" => $cnv["guid"],
3918                         "subject" => $cnv["subject"],
3919                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
3920                         "participants" => $cnv["recips"]
3921                 ];
3922
3923                 $body = BBCode::toMarkdown($item["body"]);
3924                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3925
3926                 $msg = [
3927                         "author" => $myaddr,
3928                         "guid" => $item["guid"],
3929                         "conversation_guid" => $cnv["guid"],
3930                         "text" => $body,
3931                         "created_at" => $created,
3932                 ];
3933
3934                 if ($item["reply"]) {
3935                         $message = $msg;
3936                         $type = "message";
3937                 } else {
3938                         $message = [
3939                                         "author" => $cnv["creator"],
3940                                         "guid" => $cnv["guid"],
3941                                         "subject" => $cnv["subject"],
3942                                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
3943                                         "participants" => $cnv["recips"],
3944                                         "message" => $msg];
3945
3946                         $type = "conversation";
3947                 }
3948
3949                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
3950         }
3951
3952         /**
3953          * @brief Split a name into first name and last name
3954          *
3955          * @param string $name The name
3956          *
3957          * @return array The array with "first" and "last"
3958          */
3959         public static function splitName($name) {
3960                 $name = trim($name);
3961
3962                 // Is the name longer than 64 characters? Then cut the rest of it.
3963                 if (strlen($name) > 64) {
3964                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
3965                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
3966                         } else {
3967                                 $name = substr($name, 0, 64);
3968                         }
3969                 }
3970
3971                 // Take the first word as first name
3972                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
3973                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3974                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3975                         return ['first' => $first, 'last' => $last];
3976                 }
3977
3978                 // Take the last word as last name
3979                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
3980                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3981
3982                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
3983                         return ['first' => $first, 'last' => $last];
3984                 }
3985
3986                 // Take the first 32 characters if there is no space in the first 32 characters
3987                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
3988                         $first = substr($name, 0, 32);
3989                         $last = substr($name, 32);
3990                         return ['first' => $first, 'last' => $last];
3991                 }
3992
3993                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
3994                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
3995
3996                 // Check if the last name is longer than 32 characters
3997                 if (strlen($last) > 32) {
3998                         if (strpos($last, ' ') <= 32) {
3999                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4000                         } else {
4001                                 $last = substr($last, 0, 32);
4002                         }
4003                 }
4004
4005                 return ['first' => $first, 'last' => $last];
4006         }
4007
4008         /**
4009          * @brief Create profile data
4010          *
4011          * @param int $uid The user id
4012          *
4013          * @return array The profile data
4014          */
4015         private static function createProfileData($uid)
4016         {
4017                 $r = q(
4018                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4019                         FROM `profile`
4020                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4021                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4022                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4023                         intval($uid)
4024                 );
4025
4026                 if (!$r) {
4027                         return [];
4028                 }
4029
4030                 $profile = $r[0];
4031                 $handle = $profile["addr"];
4032
4033                 $split_name = self::splitName($profile['name']);
4034                 $first = $split_name['first'];
4035                 $last = $split_name['last'];
4036
4037                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4038                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4039                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4040                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4041
4042                 $dob = null;
4043                 $about = null;
4044                 $location = null;
4045                 $tags = null;
4046                 if ($searchable === 'true') {
4047                         $dob = '';
4048
4049                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4050                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4051                                 if ($year < 1004) {
4052                                         $year = 1004;
4053                                 }
4054                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4055                         }
4056
4057                         $about = $profile['about'];
4058                         $about = strip_tags(BBCode::convert($about));
4059
4060                         $location = Profile::formatLocation($profile);
4061                         $tags = '';
4062                         if ($profile['pub_keywords']) {
4063                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4064                                 $kw = str_replace('  ', ' ', $kw);
4065                                 $arr = explode(' ', $profile['pub_keywords']);
4066                                 if (count($arr)) {
4067                                         for ($x = 0; $x < 5; $x ++) {
4068                                                 if (!empty($arr[$x])) {
4069                                                         $tags .= '#'. trim($arr[$x]) .' ';
4070                                                 }
4071                                         }
4072                                 }
4073                         }
4074                         $tags = trim($tags);
4075                 }
4076
4077                 return ["author" => $handle,
4078                                 "first_name" => $first,
4079                                 "last_name" => $last,
4080                                 "image_url" => $large,
4081                                 "image_url_medium" => $medium,
4082                                 "image_url_small" => $small,
4083                                 "birthday" => $dob,
4084                                 "gender" => $profile['gender'],
4085                                 "bio" => $about,
4086                                 "location" => $location,
4087                                 "searchable" => $searchable,
4088                                 "nsfw" => "false",
4089                                 "tag_string" => $tags];
4090         }
4091
4092         /**
4093          * @brief Sends profile data
4094          *
4095          * @param int  $uid    The user id
4096          * @param bool $recips optional, default false
4097          * @return void
4098          */
4099         public static function sendProfile($uid, $recips = false)
4100         {
4101                 if (!$uid) {
4102                         return;
4103                 }
4104
4105                 $owner = User::getOwnerDataById($uid);
4106                 if (!$owner) {
4107                         return;
4108                 }
4109
4110                 if (!$recips) {
4111                         $recips = q(
4112                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4113                                 AND `uid` = %d AND `rel` != %d",
4114                                 DBA::escape(Protocol::DIASPORA),
4115                                 intval($uid),
4116                                 intval(Contact::SHARING)
4117                         );
4118                 }
4119
4120                 if (!$recips) {
4121                         return;
4122                 }
4123
4124                 $message = self::createProfileData($uid);
4125
4126                 foreach ($recips as $recip) {
4127                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4128                         self::buildAndTransmit($owner, $recip, "profile", $message, false, "", false);
4129                 }
4130         }
4131
4132         /**
4133          * @brief Creates the signature for likes that are created on our system
4134          *
4135          * @param integer $uid  The user of that comment
4136          * @param array   $item Item array
4137          *
4138          * @return array Signed content
4139          */
4140         public static function createLikeSignature($uid, array $item)
4141         {
4142                 $owner = User::getOwnerDataById($uid);
4143                 if (empty($owner)) {
4144                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4145                         return false;
4146                 }
4147
4148                 if (!in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4149                         return false;
4150                 }
4151
4152                 $message = self::constructLike($item, $owner);
4153                 if ($message === false) {
4154                         return false;
4155                 }
4156
4157                 $message["author_signature"] = self::signature($owner, $message);
4158
4159                 return $message;
4160         }
4161
4162         /**
4163          * @brief Creates the signature for Comments that are created on our system
4164          *
4165          * @param integer $uid  The user of that comment
4166          * @param array   $item Item array
4167          *
4168          * @return array Signed content
4169          */
4170         public static function createCommentSignature($uid, array $item)
4171         {
4172                 $owner = User::getOwnerDataById($uid);
4173                 if (empty($owner)) {
4174                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4175                         return false;
4176                 }
4177
4178                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4179                 $item['thr-parent'] = $item['parent-uri'];
4180
4181                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4182                 if (!DBA::isResult($parent)) {
4183                         return;
4184                 }
4185
4186                 $item['parent-uri'] = $parent['parent-uri'];
4187
4188                 $message = self::constructComment($item, $owner);
4189                 if ($message === false) {
4190                         return false;
4191                 }
4192
4193                 $message["author_signature"] = self::signature($owner, $message);
4194
4195                 return $message;
4196         }
4197 }