src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @file src/Protocol/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  *
   6  * The new protocol is described here: http://diaspora.github.io/diaspora_federation/index.html
   7  * This implementation here interprets the old and the new protocol and sends the new one.
   8  * In the future we will remove most stuff from "validPosting" and interpret only the new protocol.
   9  */
  10
  11 namespace Friendica\Protocol;
  12
  13 use Friendica\Content\Text\BBCode;
  14 use Friendica\Content\Text\Markdown;
  15 use Friendica\Core\Cache;
  16 use Friendica\Core\Config;
  17 use Friendica\Core\L10n;
  18 use Friendica\Core\PConfig;
  19 use Friendica\Core\System;
  20 use Friendica\Core\Worker;
  21 use Friendica\Database\DBM;
  22 use Friendica\Model\Contact;
  23 use Friendica\Model\GContact;
  24 use Friendica\Model\Group;
  25 use Friendica\Model\Item;
  26 use Friendica\Model\Profile;
  27 use Friendica\Model\Queue;
  28 use Friendica\Model\User;
  29 use Friendica\Network\Probe;
  30 use Friendica\Util\Crypto;
  31 use Friendica\Util\DateTimeFormat;
  32 use Friendica\Util\Network;
  33 use Friendica\Util\XML;
  34 use Friendica\Util\Map;
  35 use dba;
  36 use SimpleXMLElement;
  37
  38 require_once 'include/dba.php';
  39 require_once 'include/items.php';
  40
  41 /**
  42  * @brief This class contain functions to create and send Diaspora XML files
  43  *
  44  */
  45 class Diaspora
  46 {
  47         /**
  48          * @brief Return a list of relay servers
  49          *
  50          * The list contains not only the official relays but also servers that we serve directly
  51          *
  52          * @param integer $item_id  The id of the item that is sent
  53          * @param array   $contacts The previously fetched contacts
  54          *
  55          * @return array of relay servers
  56          */
  57         public static function relayList($item_id, $contacts = [])
  58         {
  59                 $serverlist = [];
  60
  61                 // Fetching relay servers
  62                 $serverdata = Config::get("system", "relay_server");
  63                 if ($serverdata != "") {
  64                         $servers = explode(",", $serverdata);
  65                         foreach ($servers as $server) {
  66                                 $serverlist[$server] = trim($server);
  67                         }
  68                 }
  69
  70                 if (Config::get("system", "relay_directly", false)) {
  71                         // We distribute our stuff based on the parent to ensure that the thread will be complete
  72                         $parent = dba::selectFirst('item', ['parent'], ['id' => $item_id]);
  73                         if (!DBM::is_result($parent)) {
  74                                 return;
  75                         }
  76
  77                         // Servers that want to get all content
  78                         $servers = dba::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  79                         while ($server = dba::fetch($servers)) {
  80                                 $serverlist[$server['url']] = $server['url'];
  81                         }
  82
  83                         // All tags of the current post
  84                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
  85                         $tags = dba::select('term', ['term'], $condition);
  86                         $taglist = [];
  87                         while ($tag = dba::fetch($tags)) {
  88                                 $taglist[] = $tag['term'];
  89                         }
  90
  91                         // All servers who wants content with this tag
  92                         $tagserverlist = [];
  93                         if (!empty($taglist)) {
  94                                 $tagserver = dba::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  95                                 while ($server = dba::fetch($tagserver)) {
  96                                         $tagserverlist[] = $server['gserver-id'];
  97                                 }
  98                         }
  99
 100                         // All adresses with the given id
 101                         if (!empty($tagserverlist)) {
 102                                 $servers = dba::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 103                                 while ($server = dba::fetch($servers)) {
 104                                         $serverlist[$server['url']] = $server['url'];
 105                                 }
 106                         }
 107                 }
 108
 109                 // Now we are collecting all relay contacts
 110                 foreach ($serverlist as $server_url) {
 111                         // We don't send messages to ourselves
 112                         if (link_compare($server_url, System::baseUrl())) {
 113                                 continue;
 114                         }
 115                         $contact = self::getRelayContact($server_url);
 116                         if (is_bool($contact)) {
 117                                 continue;
 118                         }
 119
 120                         $exists = false;
 121                         foreach ($contacts as $entry) {
 122                                 if ($entry['batch'] == $contact['batch']) {
 123                                         $exists = true;
 124                                 }
 125                         }
 126
 127                         if (!$exists) {
 128                                 $contacts[] = $contact;
 129                         }
 130                 }
 131
 132                 return $contacts;
 133         }
 134
 135         /**
 136          * @brief Return a contact for a given server address or creates a dummy entry
 137          *
 138          * @param string $server_url The url of the server
 139          * @return array with the contact
 140          */
 141         private static function getRelayContact($server_url)
 142         {
 143                 $fields = ['batch', 'id', 'name', 'network', 'archive', 'blocked'];
 144
 145                 // Fetch the relay contact
 146                 $condition = ['uid' => 0, 'nurl' => normalise_link($server_url),
 147                         'contact-type' => ACCOUNT_TYPE_RELAY];
 148                 $contact = dba::selectFirst('contact', $fields, $condition);
 149
 150                 if (DBM::is_result($contact)) {
 151                         if ($contact['archive'] || $contact['blocked']) {
 152                                 return false;
 153                         }
 154                         return $contact;
 155                 } else {
 156                         self::setRelayContact($server_url);
 157
 158                         $contact = dba::selectFirst('contact', $fields, $condition);
 159                         if (DBM::is_result($contact)) {
 160                                 return $contact;
 161                         }
 162                 }
 163
 164                 // It should never happen that we arrive here
 165                 return [];
 166         }
 167
 168         /**
 169          * @brief Update or insert a relay contact
 170          *
 171          * @param string $server_url The url of the server
 172          * @param array $network_fields Optional network specific fields
 173          */
 174         public static function setRelayContact($server_url, $network_fields = [])
 175         {
 176                 $fields = ['created' => DateTimeFormat::utcNow(),
 177                         'name' => 'relay', 'nick' => 'relay',
 178                         'url' => $server_url, 'network' => NETWORK_DIASPORA,
 179                         'batch' => $server_url . '/receive/public',
 180                         'rel' => CONTACT_IS_FOLLOWER, 'blocked' => false,
 181                         'pending' => false, 'writable' => true];
 182
 183                 $fields = array_merge($fields, $network_fields);
 184
 185                 $condition = ['uid' => 0, 'nurl' => normalise_link($server_url),
 186                         'contact-type' => ACCOUNT_TYPE_RELAY];
 187
 188                 if (dba::exists('contact', $condition)) {
 189                         unset($fields['created']);
 190                 }
 191
 192                 dba::update('contact', $fields, $condition, true);
 193         }
 194
 195         /**
 196          * @brief Return a list of participating contacts for a thread
 197          *
 198          * This is used for the participation feature.
 199          * One of the parameters is a contact array.
 200          * This is done to avoid duplicates.
 201          *
 202          * @param integer $thread   The id of the thread
 203          * @param array   $contacts The previously fetched contacts
 204          *
 205          * @return array of relay servers
 206          */
 207         public static function participantsForThread($thread, $contacts)
 208         {
 209                 $r = dba::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
 210                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 211                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 212                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 213                                 WHERE `participation`.`iid` = ?", $thread);
 214
 215                 while ($contact = dba::fetch($r)) {
 216                         if (!empty($contact['fnetwork'])) {
 217                                 $contact['network'] = $contact['fnetwork'];
 218                         }
 219                         unset($contact['fnetwork']);
 220
 221                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 222                                 $contact['batch'] = $contact['fbatch'];
 223                         }
 224                         unset($contact['fbatch']);
 225
 226                         $exists = false;
 227                         foreach ($contacts as $entry) {
 228                                 if ($entry['batch'] == $contact['batch']) {
 229                                         $exists = true;
 230                                 }
 231                         }
 232
 233                         if (!$exists) {
 234                                 $contacts[] = $contact;
 235                         }
 236                 }
 237                 dba::close($r);
 238
 239                 return $contacts;
 240         }
 241
 242         /**
 243          * @brief repairs a signature that was double encoded
 244          *
 245          * The function is unused at the moment. It was copied from the old implementation.
 246          *
 247          * @param string  $signature The signature
 248          * @param string  $handle    The handle of the signature owner
 249          * @param integer $level     This value is only set inside this function to avoid endless loops
 250          *
 251          * @return string the repaired signature
 252          */
 253         private static function repairSignature($signature, $handle = "", $level = 1)
 254         {
 255                 if ($signature == "") {
 256                         return ($signature);
 257                 }
 258
 259                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 260                         $signature = base64_decode($signature);
 261                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
 262
 263                         // Do a recursive call to be able to fix even multiple levels
 264                         if ($level < 10) {
 265                                 $signature = self::repairSignature($signature, $handle, ++$level);
 266                         }
 267                 }
 268
 269                 return($signature);
 270         }
 271
 272         /**
 273          * @brief verify the envelope and return the verified data
 274          *
 275          * @param string $envelope The magic envelope
 276          *
 277          * @return string verified data
 278          */
 279         private static function verifyMagicEnvelope($envelope)
 280         {
 281                 $basedom = XML::parseString($envelope);
 282
 283                 if (!is_object($basedom)) {
 284                         logger("Envelope is no XML file");
 285                         return false;
 286                 }
 287
 288                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 289
 290                 if (sizeof($children) == 0) {
 291                         logger("XML has no children");
 292                         return false;
 293                 }
 294
 295                 $handle = "";
 296
 297                 $data = base64url_decode($children->data);
 298                 $type = $children->data->attributes()->type[0];
 299
 300                 $encoding = $children->encoding;
 301
 302                 $alg = $children->alg;
 303
 304                 $sig = base64url_decode($children->sig);
 305                 $key_id = $children->sig->attributes()->key_id[0];
 306                 if ($key_id != "") {
 307                         $handle = base64url_decode($key_id);
 308                 }
 309
 310                 $b64url_data = base64url_encode($data);
 311                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 312
 313                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 314
 315                 if ($handle == '') {
 316                         logger('No author could be decoded. Discarding. Message: ' . $envelope);
 317                         return false;
 318                 }
 319
 320                 $key = self::key($handle);
 321                 if ($key == '') {
 322                         logger("Couldn't get a key for handle " . $handle . ". Discarding.");
 323                         return false;
 324                 }
 325
 326                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 327                 if (!$verify) {
 328                         logger('Message from ' . $handle . ' did not verify. Discarding.');
 329                         return false;
 330                 }
 331
 332                 return $data;
 333         }
 334
 335         /**
 336          * @brief encrypts data via AES
 337          *
 338          * @param string $key  The AES key
 339          * @param string $iv   The IV (is used for CBC encoding)
 340          * @param string $data The data that is to be encrypted
 341          *
 342          * @return string encrypted data
 343          */
 344         private static function aesEncrypt($key, $iv, $data)
 345         {
 346                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 347         }
 348
 349         /**
 350          * @brief decrypts data via AES
 351          *
 352          * @param string $key       The AES key
 353          * @param string $iv        The IV (is used for CBC encoding)
 354          * @param string $encrypted The encrypted data
 355          *
 356          * @return string decrypted data
 357          */
 358         private static function aesDecrypt($key, $iv, $encrypted)
 359         {
 360                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 361         }
 362
 363         /**
 364          * @brief: Decodes incoming Diaspora message in the new format
 365          *
 366          * @param array  $importer Array of the importer user
 367          * @param string $raw      raw post message
 368          *
 369          * @return array
 370          * 'message' -> decoded Diaspora XML message
 371          * 'author' -> author diaspora handle
 372          * 'key' -> author public key (converted to pkcs#8)
 373          */
 374         public static function decodeRaw($importer, $raw)
 375         {
 376                 $data = json_decode($raw);
 377
 378                 // Is it a private post? Then decrypt the outer Salmon
 379                 if (is_object($data)) {
 380                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 381                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 382
 383                         $outer_key_bundle = '';
 384                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 385                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 386
 387                         if (!is_object($j_outer_key_bundle)) {
 388                                 logger('Outer Salmon did not verify. Discarding.');
 389                                 System::httpExit(400);
 390                         }
 391
 392                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 393                         $outer_key = base64_decode($j_outer_key_bundle->key);
 394
 395                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 396                 } else {
 397                         $xml = $raw;
 398                 }
 399
 400                 $basedom = XML::parseString($xml);
 401
 402                 if (!is_object($basedom)) {
 403                         logger('Received data does not seem to be an XML. Discarding. '.$xml);
 404                         System::httpExit(400);
 405                 }
 406
 407                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 408
 409                 // Not sure if this cleaning is needed
 410                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 411
 412                 // Build the signed data
 413                 $type = $base->data[0]->attributes()->type[0];
 414                 $encoding = $base->encoding;
 415                 $alg = $base->alg;
 416                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 417
 418                 // This is the signature
 419                 $signature = base64url_decode($base->sig);
 420
 421                 // Get the senders' public key
 422                 $key_id = $base->sig[0]->attributes()->key_id[0];
 423                 $author_addr = base64_decode($key_id);
 424                 if ($author_addr == '') {
 425                         logger('No author could be decoded. Discarding. Message: ' . $xml);
 426                         System::httpExit(400);
 427                 }
 428
 429                 $key = self::key($author_addr);
 430                 if ($key == '') {
 431                         logger("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 432                         System::httpExit(400);
 433                 }
 434
 435                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 436                 if (!$verify) {
 437                         logger('Message did not verify. Discarding.');
 438                         System::httpExit(400);
 439                 }
 440
 441                 return ['message' => (string)base64url_decode($base->data),
 442                                 'author' => unxmlify($author_addr),
 443                                 'key' => (string)$key];
 444         }
 445
 446         /**
 447          * @brief: Decodes incoming Diaspora message in the deprecated format
 448          *
 449          * @param array  $importer Array of the importer user
 450          * @param string $xml      urldecoded Diaspora salmon
 451          *
 452          * @return array
 453          * 'message' -> decoded Diaspora XML message
 454          * 'author' -> author diaspora handle
 455          * 'key' -> author public key (converted to pkcs#8)
 456          */
 457         public static function decode($importer, $xml)
 458         {
 459                 $public = false;
 460                 $basedom = XML::parseString($xml);
 461
 462                 if (!is_object($basedom)) {
 463                         logger("XML is not parseable.");
 464                         return false;
 465                 }
 466                 $children = $basedom->children('https://joindiaspora.com/protocol');
 467
 468                 $inner_aes_key = null;
 469                 $inner_iv = null;
 470
 471                 if ($children->header) {
 472                         $public = true;
 473                         $author_link = str_replace('acct:', '', $children->header->author_id);
 474                 } else {
 475                         // This happens with posts from a relais
 476                         if (!$importer) {
 477                                 logger("This is no private post in the old format", LOGGER_DEBUG);
 478                                 return false;
 479                         }
 480
 481                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 482
 483                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 484                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 485
 486                         $outer_key_bundle = '';
 487                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 488
 489                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 490
 491                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 492                         $outer_key = base64_decode($j_outer_key_bundle->key);
 493
 494                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 495
 496                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 497                         $idom = XML::parseString($decrypted);
 498
 499                         $inner_iv = base64_decode($idom->iv);
 500                         $inner_aes_key = base64_decode($idom->aes_key);
 501
 502                         $author_link = str_replace('acct:', '', $idom->author_id);
 503                 }
 504
 505                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 506
 507                 // figure out where in the DOM tree our data is hiding
 508
 509                 $base = null;
 510                 if ($dom->provenance->data) {
 511                         $base = $dom->provenance;
 512                 } elseif ($dom->env->data) {
 513                         $base = $dom->env;
 514                 } elseif ($dom->data) {
 515                         $base = $dom;
 516                 }
 517
 518                 if (!$base) {
 519                         logger('unable to locate salmon data in xml');
 520                         System::httpExit(400);
 521                 }
 522
 523
 524                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 525                 $signature = base64url_decode($base->sig);
 526
 527                 // unpack the  data
 528
 529                 // strip whitespace so our data element will return to one big base64 blob
 530                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 531
 532
 533                 // stash away some other stuff for later
 534
 535                 $type = $base->data[0]->attributes()->type[0];
 536                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 537                 $encoding = $base->encoding;
 538                 $alg = $base->alg;
 539
 540
 541                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 542
 543
 544                 // decode the data
 545                 $data = base64url_decode($data);
 546
 547
 548                 if ($public) {
 549                         $inner_decrypted = $data;
 550                 } else {
 551                         // Decode the encrypted blob
 552                         $inner_encrypted = base64_decode($data);
 553                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 554                 }
 555
 556                 if (!$author_link) {
 557                         logger('Could not retrieve author URI.');
 558                         System::httpExit(400);
 559                 }
 560                 // Once we have the author URI, go to the web and try to find their public key
 561                 // (first this will look it up locally if it is in the fcontact cache)
 562                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 563
 564                 logger('Fetching key for '.$author_link);
 565                 $key = self::key($author_link);
 566
 567                 if (!$key) {
 568                         logger('Could not retrieve author key.');
 569                         System::httpExit(400);
 570                 }
 571
 572                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 573
 574                 if (!$verify) {
 575                         logger('Message did not verify. Discarding.');
 576                         System::httpExit(400);
 577                 }
 578
 579                 logger('Message verified.');
 580
 581                 return ['message' => (string)$inner_decrypted,
 582                                 'author' => unxmlify($author_link),
 583                                 'key' => (string)$key];
 584         }
 585
 586
 587         /**
 588          * @brief Dispatches public messages and find the fitting receivers
 589          *
 590          * @param array $msg The post that will be dispatched
 591          *
 592          * @return int The message id of the generated message, "true" or "false" if there was an error
 593          */
 594         public static function dispatchPublic($msg)
 595         {
 596                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 597                 if (!$enabled) {
 598                         logger("diaspora is disabled");
 599                         return false;
 600                 }
 601
 602                 if (!($fields = self::validPosting($msg))) {
 603                         logger("Invalid posting");
 604                         return false;
 605                 }
 606
 607                 $importer = ["uid" => 0, "page-flags" => PAGE_FREELOVE];
 608                 $success = self::dispatch($importer, $msg, $fields);
 609
 610                 return $success;
 611         }
 612
 613         /**
 614          * @brief Dispatches the different message types to the different functions
 615          *
 616          * @param array  $importer Array of the importer user
 617          * @param array  $msg      The post that will be dispatched
 618          * @param object $fields   SimpleXML object that contains the message
 619          *
 620          * @return int The message id of the generated message, "true" or "false" if there was an error
 621          */
 622         public static function dispatch($importer, $msg, $fields = null)
 623         {
 624                 // The sender is the handle of the contact that sent the message.
 625                 // This will often be different with relayed messages (for example "like" and "comment")
 626                 $sender = $msg["author"];
 627
 628                 // This is only needed for private postings since this is already done for public ones before
 629                 if (is_null($fields)) {
 630                         $private = true;
 631                         if (!($fields = self::validPosting($msg))) {
 632                                 logger("Invalid posting");
 633                                 return false;
 634                         }
 635                 } else {
 636                         $private = false;
 637                 }
 638
 639                 $type = $fields->getName();
 640
 641                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 642
 643                 switch ($type) {
 644                         case "account_migration":
 645                                 if (!$private) {
 646                                         logger('Message with type ' . $type . ' is not private, quitting.');
 647                                         return false;
 648                                 }
 649                                 return self::receiveAccountMigration($importer, $fields);
 650
 651                         case "account_deletion":
 652                                 return self::receiveAccountDeletion($fields);
 653
 654                         case "comment":
 655                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 656
 657                         case "contact":
 658                                 if (!$private) {
 659                                         logger('Message with type ' . $type . ' is not private, quitting.');
 660                                         return false;
 661                                 }
 662                                 return self::receiveContactRequest($importer, $fields);
 663
 664                         case "conversation":
 665                                 if (!$private) {
 666                                         logger('Message with type ' . $type . ' is not private, quitting.');
 667                                         return false;
 668                                 }
 669                                 return self::receiveConversation($importer, $msg, $fields);
 670
 671                         case "like":
 672                                 return self::receiveLike($importer, $sender, $fields);
 673
 674                         case "message":
 675                                 if (!$private) {
 676                                         logger('Message with type ' . $type . ' is not private, quitting.');
 677                                         return false;
 678                                 }
 679                                 return self::receiveMessage($importer, $fields);
 680
 681                         case "participation":
 682                                 if (!$private) {
 683                                         logger('Message with type ' . $type . ' is not private, quitting.');
 684                                         return false;
 685                                 }
 686                                 return self::receiveParticipation($importer, $fields);
 687
 688                         case "photo": // Not implemented
 689                                 return self::receivePhoto($importer, $fields);
 690
 691                         case "poll_participation": // Not implemented
 692                                 return self::receivePollParticipation($importer, $fields);
 693
 694                         case "profile":
 695                                 if (!$private) {
 696                                         logger('Message with type ' . $type . ' is not private, quitting.');
 697                                         return false;
 698                                 }
 699                                 return self::receiveProfile($importer, $fields);
 700
 701                         case "reshare":
 702                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 703
 704                         case "retraction":
 705                                 return self::receiveRetraction($importer, $sender, $fields);
 706
 707                         case "status_message":
 708                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 709
 710                         default:
 711                                 logger("Unknown message type ".$type);
 712                                 return false;
 713                 }
 714
 715                 return true;
 716         }
 717
 718         /**
 719          * @brief Checks if a posting is valid and fetches the data fields.
 720          *
 721          * This function does not only check the signature.
 722          * It also does the conversion between the old and the new diaspora format.
 723          *
 724          * @param array $msg Array with the XML, the sender handle and the sender signature
 725          *
 726          * @return bool|array If the posting is valid then an array with an SimpleXML object is returned
 727          */
 728         private static function validPosting($msg)
 729         {
 730                 $data = XML::parseString($msg["message"]);
 731
 732                 if (!is_object($data)) {
 733                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 734                         return false;
 735                 }
 736
 737                 // Is this the new or the old version?
 738                 if ($data->getName() == "XML") {
 739                         $oldXML = true;
 740                         foreach ($data->post->children() as $child) {
 741                                 $element = $child;
 742                         }
 743                 } else {
 744                         $oldXML = false;
 745                         $element = $data;
 746                 }
 747
 748                 $type = $element->getName();
 749                 $orig_type = $type;
 750
 751                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 752
 753                 // All retractions are handled identically from now on.
 754                 // In the new version there will only be "retraction".
 755                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 756                         $type = "retraction";
 757
 758                 if ($type == "request") {
 759                         $type = "contact";
 760                 }
 761
 762                 $fields = new SimpleXMLElement("<".$type."/>");
 763
 764                 $signed_data = "";
 765                 $author_signature = null;
 766                 $parent_author_signature = null;
 767
 768                 foreach ($element->children() as $fieldname => $entry) {
 769                         if ($oldXML) {
 770                                 // Translation for the old XML structure
 771                                 if ($fieldname == "diaspora_handle") {
 772                                         $fieldname = "author";
 773                                 }
 774                                 if ($fieldname == "participant_handles") {
 775                                         $fieldname = "participants";
 776                                 }
 777                                 if (in_array($type, ["like", "participation"])) {
 778                                         if ($fieldname == "target_type") {
 779                                                 $fieldname = "parent_type";
 780                                         }
 781                                 }
 782                                 if ($fieldname == "sender_handle") {
 783                                         $fieldname = "author";
 784                                 }
 785                                 if ($fieldname == "recipient_handle") {
 786                                         $fieldname = "recipient";
 787                                 }
 788                                 if ($fieldname == "root_diaspora_id") {
 789                                         $fieldname = "root_author";
 790                                 }
 791                                 if ($type == "status_message") {
 792                                         if ($fieldname == "raw_message") {
 793                                                 $fieldname = "text";
 794                                         }
 795                                 }
 796                                 if ($type == "retraction") {
 797                                         if ($fieldname == "post_guid") {
 798                                                 $fieldname = "target_guid";
 799                                         }
 800                                         if ($fieldname == "type") {
 801                                                 $fieldname = "target_type";
 802                                         }
 803                                 }
 804                         }
 805
 806                         if (($fieldname == "author_signature") && ($entry != "")) {
 807                                 $author_signature = base64_decode($entry);
 808                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 809                                 $parent_author_signature = base64_decode($entry);
 810                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 811                                 if ($signed_data != "") {
 812                                         $signed_data .= ";";
 813                                 }
 814
 815                                 $signed_data .= $entry;
 816                         }
 817                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 818                                 || ($orig_type == "relayable_retraction")
 819                         ) {
 820                                 XML::copy($entry, $fields, $fieldname);
 821                         }
 822                 }
 823
 824                 // This is something that shouldn't happen at all.
 825                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 826                         if ($msg["author"] != $fields->author) {
 827                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 828                                 return false;
 829                         }
 830                 }
 831
 832                 // Only some message types have signatures. So we quit here for the other types.
 833                 if (!in_array($type, ["comment", "like"])) {
 834                         return $fields;
 835                 }
 836                 // No author_signature? This is a must, so we quit.
 837                 if (!isset($author_signature)) {
 838                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 839                         return false;
 840                 }
 841
 842                 if (isset($parent_author_signature)) {
 843                         $key = self::key($msg["author"]);
 844                         if (empty($key)) {
 845                                 logger("No key found for parent author ".$msg["author"], LOGGER_DEBUG);
 846                                 return false;
 847                         }
 848
 849                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 850                                 logger("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 851                                 return false;
 852                         }
 853                 }
 854
 855                 $key = self::key($fields->author);
 856                 if (empty($key)) {
 857                         logger("No key found for author ".$fields->author, LOGGER_DEBUG);
 858                         return false;
 859                 }
 860
 861                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 862                         logger("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 863                         return false;
 864                 } else {
 865                         return $fields;
 866                 }
 867         }
 868
 869         /**
 870          * @brief Fetches the public key for a given handle
 871          *
 872          * @param string $handle The handle
 873          *
 874          * @return string The public key
 875          */
 876         private static function key($handle)
 877         {
 878                 $handle = strval($handle);
 879
 880                 logger("Fetching diaspora key for: ".$handle);
 881
 882                 $r = self::personByHandle($handle);
 883                 if ($r) {
 884                         return $r["pubkey"];
 885                 }
 886
 887                 return "";
 888         }
 889
 890         /**
 891          * @brief Fetches data for a given handle
 892          *
 893          * @param string $handle The handle
 894          *
 895          * @return array the queried data
 896          */
 897         public static function personByHandle($handle)
 898         {
 899                 $update = false;
 900
 901                 $person = dba::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 902                 if (DBM::is_result($person)) {
 903                         logger("In cache " . print_r($person, true), LOGGER_DEBUG);
 904
 905                         // update record occasionally so it doesn't get stale
 906                         $d = strtotime($person["updated"]." +00:00");
 907                         if ($d < strtotime("now - 14 days")) {
 908                                 $update = true;
 909                         }
 910
 911                         if ($person["guid"] == "") {
 912                                 $update = true;
 913                         }
 914                 }
 915
 916                 if (!DBM::is_result($person) || $update) {
 917                         logger("create or refresh", LOGGER_DEBUG);
 918                         $r = Probe::uri($handle, NETWORK_DIASPORA);
 919
 920                         // Note that Friendica contacts will return a "Diaspora person"
 921                         // if Diaspora connectivity is enabled on their server
 922                         if ($r && ($r["network"] === NETWORK_DIASPORA)) {
 923                                 self::updateFContact($r);
 924
 925                                 // Fetch the updated or added contact
 926                                 $person = dba::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 927                                 if (!DBM::is_result($person)) {
 928                                         $person = $r;
 929                                 }
 930                         }
 931                 }
 932
 933                 return $person;
 934         }
 935
 936         /**
 937          * @brief Updates the fcontact table
 938          *
 939          * @param array $arr The fcontact data
 940          */
 941         private static function updateFContact($arr)
 942         {
 943                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
 944                         'request' => $arr["request"], 'nick' => $arr["nick"],
 945                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
 946                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
 947                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
 948                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
 949                         'updated' => DateTimeFormat::utcNow()];
 950
 951                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
 952
 953                 dba::update('fcontact', $fields, $condition, true);
 954         }
 955
 956         /**
 957          * @brief get a handle (user@domain.tld) from a given contact id
 958          *
 959          * @param int $contact_id  The id in the contact table
 960          * @param int $pcontact_id The id in the contact table (Used for the public contact)
 961          *
 962          * @return string the handle
 963          */
 964         private static function handleFromContact($contact_id, $pcontact_id = 0)
 965         {
 966                 $handle = false;
 967
 968                 logger("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, LOGGER_DEBUG);
 969
 970                 if ($pcontact_id != 0) {
 971                         $r = q(
 972                                 "SELECT `addr` FROM `contact` WHERE `id` = %d AND `addr` != ''",
 973                                 intval($pcontact_id)
 974                         );
 975
 976                         if (DBM::is_result($r)) {
 977                                 return strtolower($r[0]["addr"]);
 978                         }
 979                 }
 980
 981                 $r = q(
 982                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 983                         intval($contact_id)
 984                 );
 985
 986                 if (DBM::is_result($r)) {
 987                         $contact = $r[0];
 988
 989                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 990
 991                         if ($contact['addr'] != "") {
 992                                 $handle = $contact['addr'];
 993                         } else {
 994                                 $baseurl_start = strpos($contact['url'], '://') + 3;
 995                                 // allows installations in a subdirectory--not sure how Diaspora will handle
 996                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
 997                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 998                                 $handle = $contact['nick'].'@'.$baseurl;
 999                         }
1000                 }
1001
1002                 return strtolower($handle);
1003         }
1004
1005         /**
1006          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1007          * fcontact guid
1008          *
1009          * @param mixed $fcontact_guid Hexadecimal string guid
1010          *
1011          * @return string the contact url or null
1012          */
1013         public static function urlFromContactGuid($fcontact_guid)
1014         {
1015                 logger("fcontact guid is ".$fcontact_guid, LOGGER_DEBUG);
1016
1017                 $r = q(
1018                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1019                         dbesc(NETWORK_DIASPORA),
1020                         dbesc($fcontact_guid)
1021                 );
1022
1023                 if (DBM::is_result($r)) {
1024                         return $r[0]['url'];
1025                 }
1026
1027                 return null;
1028         }
1029
1030         /**
1031          * @brief Get a contact id for a given handle
1032          *
1033          * @todo Move to Friendica\Model\Contact
1034          *
1035          * @param int    $uid    The user id
1036          * @param string $handle The handle in the format user@domain.tld
1037          *
1038          * @return int Contact id
1039          */
1040         private static function contactByHandle($uid, $handle)
1041         {
1042                 // First do a direct search on the contact table
1043                 $r = q(
1044                         "SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
1045                         intval($uid),
1046                         dbesc($handle)
1047                 );
1048
1049                 if (DBM::is_result($r)) {
1050                         return $r[0];
1051                 } else {
1052                         /*
1053                          * We haven't found it?
1054                          * We use another function for it that will possibly create a contact entry.
1055                          */
1056                         $cid = Contact::getIdForURL($handle, $uid);
1057
1058                         if ($cid > 0) {
1059                                 /// @TODO Contact retrieval should be encapsulated into an "entity" class like `Contact`
1060                                 $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($cid));
1061
1062                                 if (DBM::is_result($r)) {
1063                                         return $r[0];
1064                                 }
1065                         }
1066                 }
1067
1068                 $handle_parts = explode("@", $handle);
1069                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
1070                 $r = q(
1071                         "SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
1072                         dbesc(NETWORK_DFRN),
1073                         intval($uid),
1074                         dbesc($nurl_sql)
1075                 );
1076                 if (DBM::is_result($r)) {
1077                         return $r[0];
1078                 }
1079
1080                 logger("Haven't found contact for user ".$uid." and handle ".$handle, LOGGER_DEBUG);
1081                 return false;
1082         }
1083
1084         /**
1085          * @brief Check if posting is allowed for this contact
1086          *
1087          * @param array $importer   Array of the importer user
1088          * @param array $contact    The contact that is checked
1089          * @param bool  $is_comment Is the check for a comment?
1090          *
1091          * @return bool is the contact allowed to post?
1092          */
1093         private static function postAllow($importer, $contact, $is_comment = false)
1094         {
1095                 /*
1096                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1097                  * That makes us friends.
1098                  * Normally this should have handled by getting a request - but this could get lost
1099                  */
1100                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1101                 // It is not removed by now. Possibly the code is needed?
1102                 //if (!$is_comment && $contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1103                 //      dba::update(
1104                 //              'contact',
1105                 //              array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
1106                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1107                 //      );
1108                 //
1109                 //      $contact["rel"] = CONTACT_IS_FRIEND;
1110                 //      logger("defining user ".$contact["nick"]." as friend");
1111                 //}
1112
1113                 // We don't seem to like that person
1114                 if ($contact["blocked"]) {
1115                         // Maybe blocked, don't accept.
1116                         return false;
1117                         // We are following this person?
1118                 } elseif (($contact["rel"] == CONTACT_IS_SHARING) || ($contact["rel"] == CONTACT_IS_FRIEND)) {
1119                         // Yes, then it is fine.
1120                         return true;
1121                         // Is it a post to a community?
1122                 } elseif (($contact["rel"] == CONTACT_IS_FOLLOWER) && in_array($importer["page-flags"], [PAGE_COMMUNITY, PAGE_PRVGROUP])) {
1123                         // That's good
1124                         return true;
1125                         // Is the message a global user or a comment?
1126                 } elseif (($importer["uid"] == 0) || $is_comment) {
1127                         // Messages for the global users and comments are always accepted
1128                         return true;
1129                 }
1130
1131                 return false;
1132         }
1133
1134         /**
1135          * @brief Fetches the contact id for a handle and checks if posting is allowed
1136          *
1137          * @param array  $importer   Array of the importer user
1138          * @param string $handle     The checked handle in the format user@domain.tld
1139          * @param bool   $is_comment Is the check for a comment?
1140          *
1141          * @return array The contact data
1142          */
1143         private static function allowedContactByHandle($importer, $handle, $is_comment = false)
1144         {
1145                 $contact = self::contactByHandle($importer["uid"], $handle);
1146                 if (!$contact) {
1147                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1148                         // If a contact isn't found, we accept it anyway if it is a comment
1149                         if ($is_comment) {
1150                                 return $importer;
1151                         } else {
1152                                 return false;
1153                         }
1154                 }
1155
1156                 if (!self::postAllow($importer, $contact, $is_comment)) {
1157                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1158                         return false;
1159                 }
1160                 return $contact;
1161         }
1162
1163         /**
1164          * @brief Does the message already exists on the system?
1165          *
1166          * @param int    $uid  The user id
1167          * @param string $guid The guid of the message
1168          *
1169          * @return int|bool message id if the message already was stored into the system - or false.
1170          */
1171         private static function messageExists($uid, $guid)
1172         {
1173                 $r = q(
1174                         "SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1175                         intval($uid),
1176                         dbesc($guid)
1177                 );
1178
1179                 if (DBM::is_result($r)) {
1180                         logger("message ".$guid." already exists for user ".$uid);
1181                         return $r[0]["id"];
1182                 }
1183
1184                 return false;
1185         }
1186
1187         /**
1188          * @brief Checks for links to posts in a message
1189          *
1190          * @param array $item The item array
1191          * @return void
1192          */
1193         private static function fetchGuid($item)
1194         {
1195                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1196                 preg_replace_callback(
1197                         $expression,
1198                         function ($match) use ($item) {
1199                                 self::fetchGuidSub($match, $item);
1200                         },
1201                         $item["body"]
1202                 );
1203
1204                 preg_replace_callback(
1205                         "&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1206                         function ($match) use ($item) {
1207                                 self::fetchGuidSub($match, $item);
1208                         },
1209                         $item["body"]
1210                 );
1211         }
1212
1213         /**
1214          * @brief Checks for relative /people/* links in an item body to match local
1215          * contacts or prepends the remote host taken from the author link.
1216          *
1217          * @param string $body        The item body to replace links from
1218          * @param string $author_link The author link for missing local contact fallback
1219          *
1220          * @return string the replaced string
1221          */
1222         public static function replacePeopleGuid($body, $author_link)
1223         {
1224                 $return = preg_replace_callback(
1225                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1226                         function ($match) use ($author_link) {
1227                                 // $match
1228                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1229                                 // 1 => '0123456789abcdef'
1230                                 // 2 => 'Foo Bar'
1231                                 $handle = self::urlFromContactGuid($match[1]);
1232
1233                                 if ($handle) {
1234                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1235                                 } else {
1236                                         // No local match, restoring absolute remote URL from author scheme and host
1237                                         $author_url = parse_url($author_link);
1238                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1239                                 }
1240
1241                                 return $return;
1242                         },
1243                         $body
1244                 );
1245
1246                 return $return;
1247         }
1248
1249         /**
1250          * @brief sub function of "fetchGuid" which checks for links in messages
1251          *
1252          * @param array $match array containing a link that has to be checked for a message link
1253          * @param array $item  The item array
1254          * @return void
1255          */
1256         private static function fetchGuidSub($match, $item)
1257         {
1258                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1259                         self::storeByGuid($match[1], $item["owner-link"]);
1260                 }
1261         }
1262
1263         /**
1264          * @brief Fetches an item with a given guid from a given server
1265          *
1266          * @param string $guid   the message guid
1267          * @param string $server The server address
1268          * @param int    $uid    The user id of the user
1269          *
1270          * @return int the message id of the stored message or false
1271          */
1272         private static function storeByGuid($guid, $server, $uid = 0)
1273         {
1274                 $serverparts = parse_url($server);
1275                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1276
1277                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
1278
1279                 $msg = self::message($guid, $server);
1280
1281                 if (!$msg) {
1282                         return false;
1283                 }
1284
1285                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
1286
1287                 // Now call the dispatcher
1288                 return self::dispatchPublic($msg);
1289         }
1290
1291         /**
1292          * @brief Fetches a message from a server
1293          *
1294          * @param string $guid   message guid
1295          * @param string $server The url of the server
1296          * @param int    $level  Endless loop prevention
1297          *
1298          * @return array
1299          *      'message' => The message XML
1300          *      'author' => The author handle
1301          *      'key' => The public key of the author
1302          */
1303         private static function message($guid, $server, $level = 0)
1304         {
1305                 if ($level > 5) {
1306                         return false;
1307                 }
1308
1309                 // This will work for new Diaspora servers and Friendica servers from 3.5
1310                 $source_url = $server."/fetch/post/".urlencode($guid);
1311
1312                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1313
1314                 $envelope = Network::fetchUrl($source_url);
1315                 if ($envelope) {
1316                         logger("Envelope was fetched.", LOGGER_DEBUG);
1317                         $x = self::verifyMagicEnvelope($envelope);
1318                         if (!$x) {
1319                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
1320                         } else {
1321                                 logger("Envelope was verified.", LOGGER_DEBUG);
1322                         }
1323                 } else {
1324                         $x = false;
1325                 }
1326
1327                 // This will work for older Diaspora and Friendica servers
1328                 if (!$x) {
1329                         $source_url = $server."/p/".urlencode($guid).".xml";
1330                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1331
1332                         $x = Network::fetchUrl($source_url);
1333                         if (!$x) {
1334                                 return false;
1335                         }
1336                 }
1337
1338                 $source_xml = XML::parseString($x);
1339
1340                 if (!is_object($source_xml)) {
1341                         return false;
1342                 }
1343
1344                 if ($source_xml->post->reshare) {
1345                         // Reshare of a reshare - old Diaspora version
1346                         logger("Message is a reshare", LOGGER_DEBUG);
1347                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1348                 } elseif ($source_xml->getName() == "reshare") {
1349                         // Reshare of a reshare - new Diaspora version
1350                         logger("Message is a new reshare", LOGGER_DEBUG);
1351                         return self::message($source_xml->root_guid, $server, ++$level);
1352                 }
1353
1354                 $author = "";
1355
1356                 // Fetch the author - for the old and the new Diaspora version
1357                 if ($source_xml->post->status_message->diaspora_handle) {
1358                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1359                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1360                         $author = (string)$source_xml->author;
1361                 }
1362
1363                 // If this isn't a "status_message" then quit
1364                 if (!$author) {
1365                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
1366                         return false;
1367                 }
1368
1369                 $msg = ["message" => $x, "author" => $author];
1370
1371                 $msg["key"] = self::key($msg["author"]);
1372
1373                 return $msg;
1374         }
1375
1376         /**
1377          * @brief Fetches the item record of a given guid
1378          *
1379          * @param int    $uid     The user id
1380          * @param string $guid    message guid
1381          * @param string $author  The handle of the item
1382          * @param array  $contact The contact of the item owner
1383          *
1384          * @return array the item record
1385          */
1386         private static function parentItem($uid, $guid, $author, $contact)
1387         {
1388                 $r = q(
1389                         "SELECT `id`, `parent`, `body`, `wall`, `uri`, `guid`, `private`, `origin`,
1390                                 `author-name`, `author-link`, `author-avatar`,
1391                                 `owner-name`, `owner-link`, `owner-avatar`
1392                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1393                         intval($uid),
1394                         dbesc($guid)
1395                 );
1396
1397                 if (!$r) {
1398                         $result = self::storeByGuid($guid, $contact["url"], $uid);
1399
1400                         if (!$result) {
1401                                 $person = self::personByHandle($author);
1402                                 $result = self::storeByGuid($guid, $person["url"], $uid);
1403                         }
1404
1405                         if ($result) {
1406                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
1407
1408                                 $r = q(
1409                                         "SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
1410                                                 `author-name`, `author-link`, `author-avatar`,
1411                                                 `owner-name`, `owner-link`, `owner-avatar`
1412                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1413                                         intval($uid),
1414                                         dbesc($guid)
1415                                 );
1416                         }
1417                 }
1418
1419                 if (!$r) {
1420                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
1421                         return false;
1422                 } else {
1423                         logger("parent item found: parent: ".$guid." - user: ".$uid);
1424                         return $r[0];
1425                 }
1426         }
1427
1428         /**
1429          * @brief returns contact details
1430          *
1431          * @param array $def_contact The default contact if the person isn't found
1432          * @param array $person      The record of the person
1433          * @param int   $uid         The user id
1434          *
1435          * @return array
1436          *      'cid' => contact id
1437          *      'network' => network type
1438          */
1439         private static function authorContactByUrl($def_contact, $person, $uid)
1440         {
1441                 $condition = ['nurl' => normalise_link($person["url"]), 'uid' => $uid];
1442                 $contact = dba::selectFirst('contact', ['id', 'network'], $condition);
1443                 if (DBM::is_result($contact)) {
1444                         $cid = $contact["id"];
1445                         $network = $contact["network"];
1446                 } else {
1447                         $cid = $def_contact["id"];
1448                         $network = NETWORK_DIASPORA;
1449                 }
1450
1451                 return ["cid" => $cid, "network" => $network];
1452         }
1453
1454         /**
1455          * @brief Is the profile a hubzilla profile?
1456          *
1457          * @param string $url The profile link
1458          *
1459          * @return bool is it a hubzilla server?
1460          */
1461         public static function isRedmatrix($url)
1462         {
1463                 return(strstr($url, "/channel/"));
1464         }
1465
1466         /**
1467          * @brief Generate a post link with a given handle and message guid
1468          *
1469          * @param string $addr        The user handle
1470          * @param string $guid        message guid
1471          * @param string $parent_guid optional parent guid
1472          *
1473          * @return string the post link
1474          */
1475         private static function plink($addr, $guid, $parent_guid = '')
1476         {
1477                 $contact = Contact::getDetailsByAddr($addr);
1478
1479                 // Fallback
1480                 if (!$contact) {
1481                         if ($parent_guid != '') {
1482                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1483                         } else {
1484                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1485                         }
1486                 }
1487
1488                 if ($contact["network"] == NETWORK_DFRN) {
1489                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1490                 }
1491
1492                 if (self::isRedmatrix($contact["url"])) {
1493                         return $contact["url"] . "/?f=&mid=" . $guid;
1494                 }
1495
1496                 if ($parent_guid != '') {
1497                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1498                 } else {
1499                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1500                 }
1501         }
1502
1503         /**
1504          * @brief Receives account migration
1505          *
1506          * @param array  $importer Array of the importer user
1507          * @param object $data     The message object
1508          *
1509          * @return bool Success
1510          */
1511         private static function receiveAccountMigration($importer, $data)
1512         {
1513                 $old_handle = notags(unxmlify($data->author));
1514                 $new_handle = notags(unxmlify($data->profile->author));
1515                 $signature = notags(unxmlify($data->signature));
1516
1517                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1518                 if (!$contact) {
1519                         logger("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1520                         return false;
1521                 }
1522
1523                 logger("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1524
1525                 // Check signature
1526                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1527                 $key = self::key($old_handle);
1528                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1529                         logger('No valid signature for migration.');
1530                         return false;
1531                 }
1532
1533                 // Update the profile
1534                 self::receiveProfile($importer, $data->profile);
1535
1536                 // change the technical stuff in contact and gcontact
1537                 $data = Probe::uri($new_handle);
1538                 if ($data['network'] == NETWORK_PHANTOM) {
1539                         logger('Account for '.$new_handle." couldn't be probed.");
1540                         return false;
1541                 }
1542
1543                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1544                                 'name' => $data['name'], 'nick' => $data['nick'],
1545                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1546                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1547                                 'network' => $data['network']];
1548
1549                 dba::update('contact', $fields, ['addr' => $old_handle]);
1550
1551                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1552                                 'name' => $data['name'], 'nick' => $data['nick'],
1553                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1554                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1555                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1556
1557                 dba::update('gcontact', $fields, ['addr' => $old_handle]);
1558
1559                 logger('Contacts are updated.');
1560
1561                 // update items
1562                 // This is an extreme performance killer
1563                 Item::update(['owner-link' => $data["url"]], ['owner-link' => $contact["url"], 'uid' => $importer["uid"]]);
1564                 Item::update(['author-link' => $data["url"]], ['author-link' => $contact["url"], 'uid' => $importer["uid"]]);
1565
1566                 logger('Items are updated.');
1567
1568                 return true;
1569         }
1570
1571         /**
1572          * @brief Processes an account deletion
1573          *
1574          * @param object $data     The message object
1575          *
1576          * @return bool Success
1577          */
1578         private static function receiveAccountDeletion($data)
1579         {
1580                 $author = notags(unxmlify($data->author));
1581
1582                 $contacts = dba::select('contact', ['id'], ['addr' => $author]);
1583                 while ($contact = dba::fetch($contacts)) {
1584                         Contact::remove($contact["id"]);
1585                 }
1586
1587                 dba::delete('gcontact', ['addr' => $author]);
1588
1589                 logger('Removed contacts for ' . $author);
1590
1591                 return true;
1592         }
1593
1594         /**
1595          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1596          *
1597          * @param string  $author    Author handle
1598          * @param string  $guid      Message guid
1599          * @param boolean $onlyfound Only return uri when found in the database
1600          *
1601          * @return string The constructed uri or the one from our database
1602          */
1603         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1604         {
1605                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1606                 if (DBM::is_result($r)) {
1607                         return $r[0]["uri"];
1608                 } elseif (!$onlyfound) {
1609                         return $author.":".$guid;
1610                 }
1611
1612                 return "";
1613         }
1614
1615         /**
1616          * @brief Fetch the guid from our database with a given uri
1617          *
1618          * @param string $uri Message uri
1619          * @param string $uid Author handle
1620          *
1621          * @return string The post guid
1622          */
1623         private static function getGuidFromUri($uri, $uid)
1624         {
1625                 $r = q("SELECT `guid` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($uri), intval($uid));
1626                 if (DBM::is_result($r)) {
1627                         return $r[0]["guid"];
1628                 } else {
1629                         return false;
1630                 }
1631         }
1632
1633         /**
1634          * @brief Find the best importer for a comment, like, ...
1635          *
1636          * @param string $guid The guid of the item
1637          *
1638          * @return array|boolean the origin owner of that post - or false
1639          */
1640         private static function importerForGuid($guid)
1641         {
1642                 $item = dba::fetch_first("SELECT `uid` FROM `item` WHERE `origin` AND `guid` = ? LIMIT 1", $guid);
1643
1644                 if (DBM::is_result($item)) {
1645                         logger("Found user ".$item['uid']." as owner of item ".$guid, LOGGER_DEBUG);
1646                         $contact = dba::fetch_first("SELECT * FROM `contact` WHERE `self` AND `uid` = ?", $item['uid']);
1647                         if (DBM::is_result($contact)) {
1648                                 return $contact;
1649                         }
1650                 }
1651                 return false;
1652         }
1653
1654         /**
1655          * @brief Processes an incoming comment
1656          *
1657          * @param array  $importer Array of the importer user
1658          * @param string $sender   The sender of the message
1659          * @param object $data     The message object
1660          * @param string $xml      The original XML of the message
1661          *
1662          * @return int The message id of the generated comment or "false" if there was an error
1663          */
1664         private static function receiveComment($importer, $sender, $data, $xml)
1665         {
1666                 $author = notags(unxmlify($data->author));
1667                 $guid = notags(unxmlify($data->guid));
1668                 $parent_guid = notags(unxmlify($data->parent_guid));
1669                 $text = unxmlify($data->text);
1670
1671                 if (isset($data->created_at)) {
1672                         $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1673                 } else {
1674                         $created_at = DateTimeFormat::utcNow();
1675                 }
1676
1677                 if (isset($data->thread_parent_guid)) {
1678                         $thread_parent_guid = notags(unxmlify($data->thread_parent_guid));
1679                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1680                 } else {
1681                         $thr_uri = "";
1682                 }
1683
1684                 $contact = self::allowedContactByHandle($importer, $sender, true);
1685                 if (!$contact) {
1686                         return false;
1687                 }
1688
1689                 $message_id = self::messageExists($importer["uid"], $guid);
1690                 if ($message_id) {
1691                         return true;
1692                 }
1693
1694                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1695                 if (!$parent_item) {
1696                         return false;
1697                 }
1698
1699                 $person = self::personByHandle($author);
1700                 if (!is_array($person)) {
1701                         logger("unable to find author details");
1702                         return false;
1703                 }
1704
1705                 // Fetch the contact id - if we know this contact
1706                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1707
1708                 $datarray = [];
1709
1710                 $datarray["uid"] = $importer["uid"];
1711                 $datarray["contact-id"] = $author_contact["cid"];
1712                 $datarray["network"]  = $author_contact["network"];
1713
1714                 $datarray["author-name"] = $person["name"];
1715                 $datarray["author-link"] = $person["url"];
1716                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
1717
1718                 $datarray["owner-name"] = $contact["name"];
1719                 $datarray["owner-link"] = $contact["url"];
1720                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
1721
1722                 $datarray["guid"] = $guid;
1723                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1724
1725                 $datarray["type"] = "remote-comment";
1726                 $datarray["verb"] = ACTIVITY_POST;
1727                 $datarray["gravity"] = GRAVITY_COMMENT;
1728
1729                 if ($thr_uri != "") {
1730                         $datarray["parent-uri"] = $thr_uri;
1731                 } else {
1732                         $datarray["parent-uri"] = $parent_item["uri"];
1733                 }
1734
1735                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1736
1737                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1738                 $datarray["source"] = $xml;
1739
1740                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1741
1742                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1743
1744                 $body = Markdown::toBBCode($text);
1745
1746                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1747
1748                 self::fetchGuid($datarray);
1749
1750                 $message_id = Item::insert($datarray);
1751
1752                 if ($message_id <= 0) {
1753                         return false;
1754                 }
1755
1756                 if ($message_id) {
1757                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1758                         if ($datarray['uid'] == 0) {
1759                                 Item::distribute($message_id);
1760                         }
1761                 }
1762
1763                 // If we are the origin of the parent we store the original data and notify our followers
1764                 if ($message_id && $parent_item["origin"]) {
1765                         // Formerly we stored the signed text, the signature and the author in different fields.
1766                         // We now store the raw data so that we are more flexible.
1767                         dba::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($data)]);
1768
1769                         // notify others
1770                         Worker::add(PRIORITY_HIGH, "Notifier", "comment-import", $message_id);
1771                 }
1772
1773                 return true;
1774         }
1775
1776         /**
1777          * @brief processes and stores private messages
1778          *
1779          * @param array  $importer     Array of the importer user
1780          * @param array  $contact      The contact of the message
1781          * @param object $data         The message object
1782          * @param array  $msg          Array of the processed message, author handle and key
1783          * @param object $mesg         The private message
1784          * @param array  $conversation The conversation record to which this message belongs
1785          *
1786          * @return bool "true" if it was successful
1787          */
1788         private static function receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation)
1789         {
1790                 $author = notags(unxmlify($data->author));
1791                 $guid = notags(unxmlify($data->guid));
1792                 $subject = notags(unxmlify($data->subject));
1793
1794                 // "diaspora_handle" is the element name from the old version
1795                 // "author" is the element name from the new version
1796                 if ($mesg->author) {
1797                         $msg_author = notags(unxmlify($mesg->author));
1798                 } elseif ($mesg->diaspora_handle) {
1799                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1800                 } else {
1801                         return false;
1802                 }
1803
1804                 $msg_guid = notags(unxmlify($mesg->guid));
1805                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1806                 $msg_text = unxmlify($mesg->text);
1807                 $msg_created_at = DateTimeFormat::utc(notags(unxmlify($mesg->created_at)));
1808
1809                 if ($msg_conversation_guid != $guid) {
1810                         logger("message conversation guid does not belong to the current conversation.");
1811                         return false;
1812                 }
1813
1814                 $body = Markdown::toBBCode($msg_text);
1815                 $message_uri = $msg_author.":".$msg_guid;
1816
1817                 $person = self::personByHandle($msg_author);
1818
1819                 dba::lock('mail');
1820
1821                 $r = q(
1822                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1823                         dbesc($msg_guid),
1824                         intval($importer["uid"])
1825                 );
1826                 if (DBM::is_result($r)) {
1827                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1828                         return false;
1829                 }
1830
1831                 q(
1832                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1833                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1834                         intval($importer["uid"]),
1835                         dbesc($msg_guid),
1836                         intval($conversation["id"]),
1837                         dbesc($person["name"]),
1838                         dbesc($person["photo"]),
1839                         dbesc($person["url"]),
1840                         intval($contact["id"]),
1841                         dbesc($subject),
1842                         dbesc($body),
1843                         0,
1844                         0,
1845                         dbesc($message_uri),
1846                         dbesc($author.":".$guid),
1847                         dbesc($msg_created_at)
1848                 );
1849
1850                 dba::unlock();
1851
1852                 dba::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
1853
1854                 notification(
1855                         [
1856                         "type" => NOTIFY_MAIL,
1857                         "notify_flags" => $importer["notify-flags"],
1858                         "language" => $importer["language"],
1859                         "to_name" => $importer["username"],
1860                         "to_email" => $importer["email"],
1861                         "uid" =>$importer["uid"],
1862                         "item" => ["subject" => $subject, "body" => $body],
1863                         "source_name" => $person["name"],
1864                         "source_link" => $person["url"],
1865                         "source_photo" => $person["thumb"],
1866                         "verb" => ACTIVITY_POST,
1867                         "otype" => "mail"]
1868                 );
1869                 return true;
1870         }
1871
1872         /**
1873          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1874          *
1875          * @param array  $importer Array of the importer user
1876          * @param array  $msg      Array of the processed message, author handle and key
1877          * @param object $data     The message object
1878          *
1879          * @return bool Success
1880          */
1881         private static function receiveConversation($importer, $msg, $data)
1882         {
1883                 $author = notags(unxmlify($data->author));
1884                 $guid = notags(unxmlify($data->guid));
1885                 $subject = notags(unxmlify($data->subject));
1886                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1887                 $participants = notags(unxmlify($data->participants));
1888
1889                 $messages = $data->message;
1890
1891                 if (!count($messages)) {
1892                         logger("empty conversation");
1893                         return false;
1894                 }
1895
1896                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1897                 if (!$contact) {
1898                         return false;
1899                 }
1900
1901                 $conversation = null;
1902
1903                 $c = q(
1904                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1905                         intval($importer["uid"]),
1906                         dbesc($guid)
1907                 );
1908                 if ($c)
1909                         $conversation = $c[0];
1910                 else {
1911                         $r = q(
1912                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1913                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1914                                 intval($importer["uid"]),
1915                                 dbesc($guid),
1916                                 dbesc($author),
1917                                 dbesc($created_at),
1918                                 dbesc(DateTimeFormat::utcNow()),
1919                                 dbesc($subject),
1920                                 dbesc($participants)
1921                         );
1922                         if ($r) {
1923                                 $c = q(
1924                                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1925                                         intval($importer["uid"]),
1926                                         dbesc($guid)
1927                                 );
1928                         }
1929
1930                         if ($c) {
1931                                 $conversation = $c[0];
1932                         }
1933                 }
1934                 if (!$conversation) {
1935                         logger("unable to create conversation.");
1936                         return false;
1937                 }
1938
1939                 foreach ($messages as $mesg) {
1940                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1941                 }
1942
1943                 return true;
1944         }
1945
1946         /**
1947          * @brief Creates the body for a "like" message
1948          *
1949          * @param array  $contact     The contact that send us the "like"
1950          * @param array  $parent_item The item array of the parent item
1951          * @param string $guid        message guid
1952          *
1953          * @return string the body
1954          */
1955         private static function constructLikeBody($contact, $parent_item, $guid)
1956         {
1957                 $bodyverb = L10n::t('%1$s likes %2$s\'s %3$s');
1958
1959                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1960                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1961                 $plink = "[url=".System::baseUrl()."/display/".urlencode($guid)."]".L10n::t("status")."[/url]";
1962
1963                 return sprintf($bodyverb, $ulink, $alink, $plink);
1964         }
1965
1966         /**
1967          * @brief Creates a XML object for a "like"
1968          *
1969          * @param array $importer    Array of the importer user
1970          * @param array $parent_item The item array of the parent item
1971          *
1972          * @return string The XML
1973          */
1974         private static function constructLikeObject($importer, $parent_item)
1975         {
1976                 $objtype = ACTIVITY_OBJ_NOTE;
1977                 $link = '<link rel="alternate" type="text/html" href="'.System::baseUrl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1978                 $parent_body = $parent_item["body"];
1979
1980                 $xmldata = ["object" => ["type" => $objtype,
1981                                                 "local" => "1",
1982                                                 "id" => $parent_item["uri"],
1983                                                 "link" => $link,
1984                                                 "title" => "",
1985                                                 "content" => $parent_body]];
1986
1987                 return XML::fromArray($xmldata, $xml, true);
1988         }
1989
1990         /**
1991          * @brief Processes "like" messages
1992          *
1993          * @param array  $importer Array of the importer user
1994          * @param string $sender   The sender of the message
1995          * @param object $data     The message object
1996          *
1997          * @return int The message id of the generated like or "false" if there was an error
1998          */
1999         private static function receiveLike($importer, $sender, $data)
2000         {
2001                 $author = notags(unxmlify($data->author));
2002                 $guid = notags(unxmlify($data->guid));
2003                 $parent_guid = notags(unxmlify($data->parent_guid));
2004                 $parent_type = notags(unxmlify($data->parent_type));
2005                 $positive = notags(unxmlify($data->positive));
2006
2007                 // likes on comments aren't supported by Diaspora - only on posts
2008                 // But maybe this will be supported in the future, so we will accept it.
2009                 if (!in_array($parent_type, ["Post", "Comment"])) {
2010                         return false;
2011                 }
2012
2013                 $contact = self::allowedContactByHandle($importer, $sender, true);
2014                 if (!$contact) {
2015                         return false;
2016                 }
2017
2018                 $message_id = self::messageExists($importer["uid"], $guid);
2019                 if ($message_id) {
2020                         return true;
2021                 }
2022
2023                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
2024                 if (!$parent_item) {
2025                         return false;
2026                 }
2027
2028                 $person = self::personByHandle($author);
2029                 if (!is_array($person)) {
2030                         logger("unable to find author details");
2031                         return false;
2032                 }
2033
2034                 // Fetch the contact id - if we know this contact
2035                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2036
2037                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2038                 // We would accept this anyhow.
2039                 if ($positive == "true") {
2040                         $verb = ACTIVITY_LIKE;
2041                 } else {
2042                         $verb = ACTIVITY_DISLIKE;
2043                 }
2044
2045                 $datarray = [];
2046
2047                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2048
2049                 $datarray["uid"] = $importer["uid"];
2050                 $datarray["contact-id"] = $author_contact["cid"];
2051                 $datarray["network"]  = $author_contact["network"];
2052
2053                 $datarray["author-name"] = $person["name"];
2054                 $datarray["author-link"] = $person["url"];
2055                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
2056
2057                 $datarray["owner-name"] = $contact["name"];
2058                 $datarray["owner-link"] = $contact["url"];
2059                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2060
2061                 $datarray["guid"] = $guid;
2062                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2063
2064                 $datarray["type"] = "activity";
2065                 $datarray["verb"] = $verb;
2066                 $datarray["gravity"] = GRAVITY_LIKE;
2067                 $datarray["parent-uri"] = $parent_item["uri"];
2068
2069                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2070                 $datarray["object"] = self::constructLikeObject($importer, $parent_item);
2071
2072                 $datarray["body"] = self::constructLikeBody($contact, $parent_item, $guid);
2073
2074                 $message_id = Item::insert($datarray);
2075
2076                 if ($message_id <= 0) {
2077                         return false;
2078                 }
2079
2080                 if ($message_id) {
2081                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2082                         if ($datarray['uid'] == 0) {
2083                                 Item::distribute($message_id);
2084                         }
2085                 }
2086
2087                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2088                 if ($parent_item["id"] != $parent_item["parent"]) {
2089                         $toplevel = dba::selectFirst('item', ['origin'], ['id' => $parent_item["parent"]]);
2090                         $origin = $toplevel["origin"];
2091                 } else {
2092                         $origin = $parent_item["origin"];
2093                 }
2094
2095                 // If we are the origin of the parent we store the original data and notify our followers
2096                 if ($message_id && $origin) {
2097                         // Formerly we stored the signed text, the signature and the author in different fields.
2098                         // We now store the raw data so that we are more flexible.
2099                         dba::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($data)]);
2100
2101                         // notify others
2102                         Worker::add(PRIORITY_HIGH, "Notifier", "comment-import", $message_id);
2103                 }
2104
2105                 return true;
2106         }
2107
2108         /**
2109          * @brief Processes private messages
2110          *
2111          * @param array  $importer Array of the importer user
2112          * @param object $data     The message object
2113          *
2114          * @return bool Success?
2115          */
2116         private static function receiveMessage($importer, $data)
2117         {
2118                 $author = notags(unxmlify($data->author));
2119                 $guid = notags(unxmlify($data->guid));
2120                 $conversation_guid = notags(unxmlify($data->conversation_guid));
2121                 $text = unxmlify($data->text);
2122                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2123
2124                 $contact = self::allowedContactByHandle($importer, $author, true);
2125                 if (!$contact) {
2126                         return false;
2127                 }
2128
2129                 $conversation = null;
2130
2131                 $c = q(
2132                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
2133                         intval($importer["uid"]),
2134                         dbesc($conversation_guid)
2135                 );
2136                 if ($c) {
2137                         $conversation = $c[0];
2138                 } else {
2139                         logger("conversation not available.");
2140                         return false;
2141                 }
2142
2143                 $message_uri = $author.":".$guid;
2144
2145                 $person = self::personByHandle($author);
2146                 if (!$person) {
2147                         logger("unable to find author details");
2148                         return false;
2149                 }
2150
2151                 $body = Markdown::toBBCode($text);
2152
2153                 $body = self::replacePeopleGuid($body, $person["url"]);
2154
2155                 dba::lock('mail');
2156
2157                 $r = q(
2158                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
2159                         dbesc($guid),
2160                         intval($importer["uid"])
2161                 );
2162                 if (DBM::is_result($r)) {
2163                         logger("duplicate message already delivered.", LOGGER_DEBUG);
2164                         return false;
2165                 }
2166
2167                 q(
2168                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
2169                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
2170                         intval($importer["uid"]),
2171                         dbesc($guid),
2172                         intval($conversation["id"]),
2173                         dbesc($person["name"]),
2174                         dbesc($person["photo"]),
2175                         dbesc($person["url"]),
2176                         intval($contact["id"]),
2177                         dbesc($conversation["subject"]),
2178                         dbesc($body),
2179                         0,
2180                         1,
2181                         dbesc($message_uri),
2182                         dbesc($author.":".$conversation["guid"]),
2183                         dbesc($created_at)
2184                 );
2185
2186                 dba::unlock();
2187
2188                 dba::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
2189                 return true;
2190         }
2191
2192         /**
2193          * @brief Processes participations - unsupported by now
2194          *
2195          * @param array  $importer Array of the importer user
2196          * @param object $data     The message object
2197          *
2198          * @return bool always true
2199          */
2200         private static function receiveParticipation($importer, $data)
2201         {
2202                 $author = strtolower(notags(unxmlify($data->author)));
2203                 $parent_guid = notags(unxmlify($data->parent_guid));
2204
2205                 $contact_id = Contact::getIdForURL($author);
2206                 if (!$contact_id) {
2207                         logger('Contact not found: '.$author);
2208                         return false;
2209                 }
2210
2211                 $person = self::personByHandle($author);
2212                 if (!is_array($person)) {
2213                         logger("Person not found: ".$author);
2214                         return false;
2215                 }
2216
2217                 $item = dba::selectFirst('item', ['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2218                 if (!DBM::is_result($item)) {
2219                         logger('Item not found, no origin or private: '.$parent_guid);
2220                         return false;
2221                 }
2222
2223                 $author_parts = explode('@', $author);
2224                 if (isset($author_parts[1])) {
2225                         $server = $author_parts[1];
2226                 } else {
2227                         // Should never happen
2228                         $server = $author;
2229                 }
2230
2231                 logger('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, LOGGER_DEBUG);
2232
2233                 if (!dba::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2234                         dba::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2235                 }
2236
2237                 // Send all existing comments and likes to the requesting server
2238                 $comments = dba::p("SELECT `item`.`id`, `item`.`verb`, `contact`.`self`
2239                                 FROM `item`
2240                                 INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2241                                 WHERE `item`.`parent` = ? AND `item`.`id` != `item`.`parent`", $item['id']);
2242                 while ($comment = dba::fetch($comments)) {
2243                         if ($comment['verb'] == ACTIVITY_POST) {
2244                                 $cmd = $comment['self'] ? 'comment-new' : 'comment-import';
2245                         } else {
2246                                 $cmd = $comment['self'] ? 'like' : 'comment-import';
2247                         }
2248                         logger("Send ".$cmd." for item ".$comment['id']." to contact ".$contact_id, LOGGER_DEBUG);
2249                         Worker::add(PRIORITY_HIGH, 'Delivery', $cmd, $comment['id'], $contact_id);
2250                 }
2251                 dba::close($comments);
2252
2253                 return true;
2254         }
2255
2256         /**
2257          * @brief Processes photos - unneeded
2258          *
2259          * @param array  $importer Array of the importer user
2260          * @param object $data     The message object
2261          *
2262          * @return bool always true
2263          */
2264         private static function receivePhoto($importer, $data)
2265         {
2266                 // There doesn't seem to be a reason for this function,
2267                 // since the photo data is transmitted in the status message as well
2268                 return true;
2269         }
2270
2271         /**
2272          * @brief Processes poll participations - unssupported
2273          *
2274          * @param array  $importer Array of the importer user
2275          * @param object $data     The message object
2276          *
2277          * @return bool always true
2278          */
2279         private static function receivePollParticipation($importer, $data)
2280         {
2281                 // We don't support polls by now
2282                 return true;
2283         }
2284
2285         /**
2286          * @brief Processes incoming profile updates
2287          *
2288          * @param array  $importer Array of the importer user
2289          * @param object $data     The message object
2290          *
2291          * @return bool Success
2292          */
2293         private static function receiveProfile($importer, $data)
2294         {
2295                 $author = strtolower(notags(unxmlify($data->author)));
2296
2297                 $contact = self::contactByHandle($importer["uid"], $author);
2298                 if (!$contact) {
2299                         return false;
2300                 }
2301
2302                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
2303                 $image_url = unxmlify($data->image_url);
2304                 $birthday = unxmlify($data->birthday);
2305                 $gender = unxmlify($data->gender);
2306                 $about = Markdown::toBBCode(unxmlify($data->bio));
2307                 $location = Markdown::toBBCode(unxmlify($data->location));
2308                 $searchable = (unxmlify($data->searchable) == "true");
2309                 $nsfw = (unxmlify($data->nsfw) == "true");
2310                 $tags = unxmlify($data->tag_string);
2311
2312                 $tags = explode("#", $tags);
2313
2314                 $keywords = [];
2315                 foreach ($tags as $tag) {
2316                         $tag = trim(strtolower($tag));
2317                         if ($tag != "") {
2318                                 $keywords[] = $tag;
2319                         }
2320                 }
2321
2322                 $keywords = implode(", ", $keywords);
2323
2324                 $handle_parts = explode("@", $author);
2325                 $nick = $handle_parts[0];
2326
2327                 if ($name === "") {
2328                         $name = $handle_parts[0];
2329                 }
2330
2331                 if (preg_match("|^https?://|", $image_url) === 0) {
2332                         $image_url = "http://".$handle_parts[1].$image_url;
2333                 }
2334
2335                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2336
2337                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2338
2339                 $birthday = str_replace("1000", "1901", $birthday);
2340
2341                 if ($birthday != "") {
2342                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2343                 }
2344
2345                 // this is to prevent multiple birthday notifications in a single year
2346                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2347
2348                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2349                         $birthday = $contact["bd"];
2350                 }
2351
2352                 $fields = ['name' => $name, 'location' => $location,
2353                         'name-date' => DateTimeFormat::utcNow(),
2354                         'about' => $about, 'gender' => $gender,
2355                         'addr' => $author, 'nick' => $nick,
2356                         'keywords' => $keywords];
2357
2358                 if (!empty($birthday)) {
2359                         $fields['bd'] = $birthday;
2360                 }
2361
2362                 dba::update('contact', $fields, ['id' => $contact['id']]);
2363
2364                 $gcontact = ["url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
2365                                         "photo" => $image_url, "name" => $name, "location" => $location,
2366                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2367                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2368                                         "hide" => !$searchable, "nsfw" => $nsfw];
2369
2370                 $gcid = GContact::update($gcontact);
2371
2372                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2373
2374                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
2375
2376                 return true;
2377         }
2378
2379         /**
2380          * @brief Processes incoming friend requests
2381          *
2382          * @param array $importer Array of the importer user
2383          * @param array $contact  The contact that send the request
2384          * @return void
2385          */
2386         private static function receiveRequestMakeFriend($importer, $contact)
2387         {
2388                 $a = get_app();
2389
2390                 if ($contact["rel"] == CONTACT_IS_SHARING) {
2391                         dba::update(
2392                                 'contact',
2393                                 ['rel' => CONTACT_IS_FRIEND, 'writable' => true],
2394                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2395                         );
2396                 }
2397                 // send notification
2398
2399                 $r = q(
2400                         "SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
2401                         intval($importer["uid"])
2402                 );
2403
2404                 if ($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(PConfig::get($importer["uid"], "system", "post_newfriend"))) {
2405                         $self = q(
2406                                 "SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
2407                                 intval($importer["uid"])
2408                         );
2409
2410                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
2411
2412                         if ($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
2413                                 $arr = [];
2414                                 $arr["protocol"] = PROTOCOL_DIASPORA;
2415                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
2416                                 $arr["uid"] = $importer["uid"];
2417                                 $arr["contact-id"] = $self[0]["id"];
2418                                 $arr["wall"] = 1;
2419                                 $arr["type"] = 'wall';
2420                                 $arr["gravity"] = 0;
2421                                 $arr["origin"] = 1;
2422                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
2423                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
2424                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
2425                                 $arr["verb"] = ACTIVITY_FRIEND;
2426                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
2427
2428                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
2429                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
2430                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
2431                                 $arr["body"] = L10n::t('%1$s is now friends with %2$s', $A, $B)."\n\n\n".$BPhoto;
2432
2433                                 $arr["object"] = self::constructNewFriendObject($contact);
2434
2435                                 $user = dba::selectFirst('user', ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'], ['uid' => $importer["uid"]]);
2436
2437                                 $arr["allow_cid"] = $user["allow_cid"];
2438                                 $arr["allow_gid"] = $user["allow_gid"];
2439                                 $arr["deny_cid"]  = $user["deny_cid"];
2440                                 $arr["deny_gid"]  = $user["deny_gid"];
2441
2442                                 $i = Item::insert($arr);
2443                                 if ($i) {
2444                                         Worker::add(PRIORITY_HIGH, "Notifier", "activity", $i);
2445                                 }
2446                         }
2447                 }
2448         }
2449
2450         /**
2451          * @brief Creates a XML object for a "new friend" message
2452          *
2453          * @param array $contact Array of the contact
2454          *
2455          * @return string The XML
2456          */
2457         private static function constructNewFriendObject($contact)
2458         {
2459                 $objtype = ACTIVITY_OBJ_PERSON;
2460                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
2461                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
2462
2463                 $xmldata = ["object" => ["type" => $objtype,
2464                                                 "title" => $contact["name"],
2465                                                 "id" => $contact["url"]."/".$contact["name"],
2466                                                 "link" => $link]];
2467
2468                 return XML::fromArray($xmldata, $xml, true);
2469         }
2470
2471         /**
2472          * @brief Processes incoming sharing notification
2473          *
2474          * @param array  $importer Array of the importer user
2475          * @param object $data     The message object
2476          *
2477          * @return bool Success
2478          */
2479         private static function receiveContactRequest($importer, $data)
2480         {
2481                 $author = unxmlify($data->author);
2482                 $recipient = unxmlify($data->recipient);
2483
2484                 if (!$author || !$recipient) {
2485                         return false;
2486                 }
2487
2488                 // the current protocol version doesn't know these fields
2489                 // That means that we will assume their existance
2490                 if (isset($data->following)) {
2491                         $following = (unxmlify($data->following) == "true");
2492                 } else {
2493                         $following = true;
2494                 }
2495
2496                 if (isset($data->sharing)) {
2497                         $sharing = (unxmlify($data->sharing) == "true");
2498                 } else {
2499                         $sharing = true;
2500                 }
2501
2502                 $contact = self::contactByHandle($importer["uid"], $author);
2503
2504                 // perhaps we were already sharing with this person. Now they're sharing with us.
2505                 // That makes us friends.
2506                 if ($contact) {
2507                         if ($following) {
2508                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", LOGGER_DEBUG);
2509                                 self::receiveRequestMakeFriend($importer, $contact);
2510
2511                                 // refetch the contact array
2512                                 $contact = self::contactByHandle($importer["uid"], $author);
2513
2514                                 // If we are now friends, we are sending a share message.
2515                                 // Normally we needn't to do so, but the first message could have been vanished.
2516                                 if (in_array($contact["rel"], [CONTACT_IS_FRIEND])) {
2517                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2518                                         if ($u) {
2519                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2520                                                 $ret = self::sendShare($u[0], $contact);
2521                                         }
2522                                 }
2523                                 return true;
2524                         } else {
2525                                 logger("Author ".$author." doesn't want to follow us anymore.", LOGGER_DEBUG);
2526                                 Contact::removeFollower($importer, $contact);
2527                                 return true;
2528                         }
2529                 }
2530
2531                 if (!$following && $sharing && in_array($importer["page-flags"], [PAGE_SOAPBOX, PAGE_NORMAL])) {
2532                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2533                         return false;
2534                 } elseif (!$following && !$sharing) {
2535                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2536                         return false;
2537                 } elseif (!$following && $sharing) {
2538                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2539                 } elseif ($following && $sharing) {
2540                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2541                 } elseif ($following && !$sharing) {
2542                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2543                 }
2544
2545                 $ret = self::personByHandle($author);
2546
2547                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2548                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2549                         return false;
2550                 }
2551
2552                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2553
2554                 $r = q(
2555                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2556                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2557                         intval($importer["uid"]),
2558                         dbesc($ret["network"]),
2559                         dbesc($ret["addr"]),
2560                         DateTimeFormat::utcNow(),
2561                         dbesc($ret["url"]),
2562                         dbesc(normalise_link($ret["url"])),
2563                         dbesc($batch),
2564                         dbesc($ret["name"]),
2565                         dbesc($ret["nick"]),
2566                         dbesc($ret["photo"]),
2567                         dbesc($ret["pubkey"]),
2568                         dbesc($ret["notify"]),
2569                         dbesc($ret["poll"]),
2570                         1,
2571                         2
2572                 );
2573
2574                 // find the contact record we just created
2575
2576                 $contact_record = self::contactByHandle($importer["uid"], $author);
2577
2578                 if (!$contact_record) {
2579                         logger("unable to locate newly created contact record.");
2580                         return;
2581                 }
2582
2583                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2584
2585                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2586
2587                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2588
2589                 if (in_array($importer["page-flags"], [PAGE_NORMAL, PAGE_PRVGROUP])) {
2590                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2591
2592                         $hash = random_string().(string)time();   // Generate a confirm_key
2593
2594                         $ret = q(
2595                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2596                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2597                                 intval($importer["uid"]),
2598                                 intval($contact_record["id"]),
2599                                 0,
2600                                 0,
2601                                 dbesc(L10n::t("Sharing notification from Diaspora network")),
2602                                 dbesc($hash),
2603                                 dbesc(DateTimeFormat::utcNow())
2604                         );
2605                 } else {
2606                         // automatic friend approval
2607
2608                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2609
2610                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2611
2612                         // technically they are sharing with us (CONTACT_IS_SHARING),
2613                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2614                         // we are going to change the relationship and make them a follower.
2615
2616                         if (($importer["page-flags"] == PAGE_FREELOVE) && $sharing && $following) {
2617                                 $new_relation = CONTACT_IS_FRIEND;
2618                         } elseif (($importer["page-flags"] == PAGE_FREELOVE) && $sharing) {
2619                                 $new_relation = CONTACT_IS_SHARING;
2620                         } else {
2621                                 $new_relation = CONTACT_IS_FOLLOWER;
2622                         }
2623
2624                         $r = q(
2625                                 "UPDATE `contact` SET `rel` = %d,
2626                                 `name-date` = '%s',
2627                                 `uri-date` = '%s',
2628                                 `blocked` = 0,
2629                                 `pending` = 0,
2630                                 `writable` = 1
2631                                 WHERE `id` = %d
2632                                 ",
2633                                 intval($new_relation),
2634                                 dbesc(DateTimeFormat::utcNow()),
2635                                 dbesc(DateTimeFormat::utcNow()),
2636                                 intval($contact_record["id"])
2637                         );
2638
2639                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2640                         if ($u) {
2641                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2642                                 $ret = self::sendShare($u[0], $contact_record);
2643
2644                                 // Send the profile data, maybe it weren't transmitted before
2645                                 self::sendProfile($importer["uid"], [$contact_record]);
2646                         }
2647                 }
2648
2649                 return true;
2650         }
2651
2652         /**
2653          * @brief Fetches a message with a given guid
2654          *
2655          * @param string $guid        message guid
2656          * @param string $orig_author handle of the original post
2657          * @param string $author      handle of the sharer
2658          *
2659          * @return array The fetched item
2660          */
2661         public static function originalItem($guid, $orig_author)
2662         {
2663                 if (empty($guid)) {
2664                         logger('Empty guid. Quitting.');
2665                         return false;
2666                 }
2667
2668                 // Do we already have this item?
2669                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2670                         'author-name', 'author-link', 'author-avatar'];
2671                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2672                 $item = dba::selectfirst('item', $fields, $condition);
2673
2674                 if (DBM::is_result($item)) {
2675                         logger("reshared message ".$guid." already exists on system.");
2676
2677                         // Maybe it is already a reshared item?
2678                         // Then refetch the content, if it is a reshare from a reshare.
2679                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2680                         if (self::isReshare($item["body"], true)) {
2681                                 $item = [];
2682                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2683                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2684
2685                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2686
2687                                 // Add OEmbed and other information to the body
2688                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2689
2690                                 return $item;
2691                         } else {
2692                                 return $item;
2693                         }
2694                 }
2695
2696                 if (!DBM::is_result($item)) {
2697                         if (empty($orig_author)) {
2698                                 logger('Empty author for guid ' . $guid . '. Quitting.');
2699                                 return false;
2700                         }
2701
2702                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2703                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2704                         $stored = self::storeByGuid($guid, $server);
2705
2706                         if (!$stored) {
2707                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2708                                 logger("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2709                                 $stored = self::storeByGuid($guid, $server);
2710                         }
2711
2712                         if ($stored) {
2713                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2714                                         'author-name', 'author-link', 'author-avatar'];
2715                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2716                                 $item = dba::selectfirst('item', $fields, $condition);
2717
2718                                 if (DBM::is_result($item)) {
2719                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2720                                         if (self::isReshare($item["body"], false)) {
2721                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2722                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2723                                         }
2724
2725                                         return $item;
2726                                 }
2727                         }
2728                 }
2729                 return false;
2730         }
2731
2732         /**
2733          * @brief Processes a reshare message
2734          *
2735          * @param array  $importer Array of the importer user
2736          * @param object $data     The message object
2737          * @param string $xml      The original XML of the message
2738          *
2739          * @return int the message id
2740          */
2741         private static function receiveReshare($importer, $data, $xml)
2742         {
2743                 $author = notags(unxmlify($data->author));
2744                 $guid = notags(unxmlify($data->guid));
2745                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2746                 $root_author = notags(unxmlify($data->root_author));
2747                 $root_guid = notags(unxmlify($data->root_guid));
2748                 /// @todo handle unprocessed property "provider_display_name"
2749                 $public = notags(unxmlify($data->public));
2750
2751                 $contact = self::allowedContactByHandle($importer, $author, false);
2752                 if (!$contact) {
2753                         return false;
2754                 }
2755
2756                 $message_id = self::messageExists($importer["uid"], $guid);
2757                 if ($message_id) {
2758                         return true;
2759                 }
2760
2761                 $original_item = self::originalItem($root_guid, $root_author);
2762                 if (!$original_item) {
2763                         return false;
2764                 }
2765
2766                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2767
2768                 $datarray = [];
2769
2770                 $datarray["uid"] = $importer["uid"];
2771                 $datarray["contact-id"] = $contact["id"];
2772                 $datarray["network"]  = NETWORK_DIASPORA;
2773
2774                 $datarray["author-name"] = $contact["name"];
2775                 $datarray["author-link"] = $contact["url"];
2776                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2777
2778                 $datarray["owner-name"] = $datarray["author-name"];
2779                 $datarray["owner-link"] = $datarray["author-link"];
2780                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2781
2782                 $datarray["guid"] = $guid;
2783                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2784
2785                 $datarray["verb"] = ACTIVITY_POST;
2786                 $datarray["gravity"] = GRAVITY_PARENT;
2787
2788                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2789                 $datarray["source"] = $xml;
2790
2791                 $prefix = share_header(
2792                         $original_item["author-name"],
2793                         $original_item["author-link"],
2794                         $original_item["author-avatar"],
2795                         $original_item["guid"],
2796                         $original_item["created"],
2797                         $orig_url
2798                 );
2799                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2800
2801                 $datarray["tag"] = $original_item["tag"];
2802                 $datarray["app"]  = $original_item["app"];
2803
2804                 $datarray["plink"] = self::plink($author, $guid);
2805                 $datarray["private"] = (($public == "false") ? 1 : 0);
2806                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2807
2808                 $datarray["object-type"] = $original_item["object-type"];
2809
2810                 self::fetchGuid($datarray);
2811                 $message_id = Item::insert($datarray);
2812
2813                 self::sendParticipation($contact, $datarray);
2814
2815                 if ($message_id) {
2816                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2817                         if ($datarray['uid'] == 0) {
2818                                 Item::distribute($message_id);
2819                         }
2820                         return true;
2821                 } else {
2822                         return false;
2823                 }
2824         }
2825
2826         /**
2827          * @brief Processes retractions
2828          *
2829          * @param array  $importer Array of the importer user
2830          * @param array  $contact  The contact of the item owner
2831          * @param object $data     The message object
2832          *
2833          * @return bool success
2834          */
2835         private static function itemRetraction($importer, $contact, $data)
2836         {
2837                 $author = notags(unxmlify($data->author));
2838                 $target_guid = notags(unxmlify($data->target_guid));
2839                 $target_type = notags(unxmlify($data->target_type));
2840
2841                 $person = self::personByHandle($author);
2842                 if (!is_array($person)) {
2843                         logger("unable to find author detail for ".$author);
2844                         return false;
2845                 }
2846
2847                 if (empty($contact["url"])) {
2848                         $contact["url"] = $person["url"];
2849                 }
2850
2851                 // Fetch items that are about to be deleted
2852                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link'];
2853
2854                 // When we receive a public retraction, we delete every item that we find.
2855                 if ($importer['uid'] == 0) {
2856                         $condition = ["`guid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid];
2857                 } else {
2858                         $condition = ["`guid` = ? AND `uid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid, $importer['uid']];
2859                 }
2860                 $r = dba::select('item', $fields, $condition);
2861                 if (!DBM::is_result($r)) {
2862                         logger("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2863                         return false;
2864                 }
2865
2866                 while ($item = dba::fetch($r)) {
2867                         // Fetch the parent item
2868                         $parent = dba::selectFirst('item', ['author-link', 'origin'], ['id' => $item["parent"]]);
2869
2870                         // Only delete it if the parent author really fits
2871                         if (!link_compare($parent["author-link"], $contact["url"]) && !link_compare($item["author-link"], $contact["url"])) {
2872                                 logger("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2873                                 continue;
2874                         }
2875
2876                         Item::deleteById($item["id"]);
2877
2878                         logger("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], LOGGER_DEBUG);
2879
2880                         // Now check if the retraction needs to be relayed by us
2881                         if ($parent["origin"]) {
2882                                 // notify others
2883                                 Worker::add(PRIORITY_HIGH, "Notifier", "drop", $item["id"]);
2884                         }
2885                 }
2886
2887                 return true;
2888         }
2889
2890         /**
2891          * @brief Receives retraction messages
2892          *
2893          * @param array  $importer Array of the importer user
2894          * @param string $sender   The sender of the message
2895          * @param object $data     The message object
2896          *
2897          * @return bool Success
2898          */
2899         private static function receiveRetraction($importer, $sender, $data)
2900         {
2901                 $target_type = notags(unxmlify($data->target_type));
2902
2903                 $contact = self::contactByHandle($importer["uid"], $sender);
2904                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2905                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2906                         return false;
2907                 }
2908
2909                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2910
2911                 switch ($target_type) {
2912                         case "Comment":
2913                         case "Like":
2914                         case "Post":
2915                         case "Reshare":
2916                         case "StatusMessage":
2917                                 return self::itemRetraction($importer, $contact, $data);
2918
2919                         case "PollParticipation":
2920                         case "Photo":
2921                                 // Currently unsupported
2922                                 break;
2923
2924                         default:
2925                                 logger("Unknown target type ".$target_type);
2926                                 return false;
2927                 }
2928                 return true;
2929         }
2930
2931         /**
2932          * @brief Receives status messages
2933          *
2934          * @param array  $importer Array of the importer user
2935          * @param object $data     The message object
2936          * @param string $xml      The original XML of the message
2937          *
2938          * @return int The message id of the newly created item
2939          */
2940         private static function receiveStatusMessage($importer, $data, $xml)
2941         {
2942                 $author = notags(unxmlify($data->author));
2943                 $guid = notags(unxmlify($data->guid));
2944                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2945                 $public = notags(unxmlify($data->public));
2946                 $text = unxmlify($data->text);
2947                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2948
2949                 $contact = self::allowedContactByHandle($importer, $author, false);
2950                 if (!$contact) {
2951                         return false;
2952                 }
2953
2954                 $message_id = self::messageExists($importer["uid"], $guid);
2955                 if ($message_id) {
2956                         return true;
2957                 }
2958
2959                 $address = [];
2960                 if ($data->location) {
2961                         foreach ($data->location->children() as $fieldname => $data) {
2962                                 $address[$fieldname] = notags(unxmlify($data));
2963                         }
2964                 }
2965
2966                 $body = Markdown::toBBCode($text);
2967
2968                 $datarray = [];
2969
2970                 // Attach embedded pictures to the body
2971                 if ($data->photo) {
2972                         foreach ($data->photo as $photo) {
2973                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2974                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2975                         }
2976
2977                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2978                 } else {
2979                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2980
2981                         // Add OEmbed and other information to the body
2982                         if (!self::isRedmatrix($contact["url"])) {
2983                                 $body = add_page_info_to_body($body, false, true);
2984                         }
2985                 }
2986
2987                 /// @todo enable support for polls
2988                 //if ($data->poll) {
2989                 //      foreach ($data->poll AS $poll)
2990                 //              print_r($poll);
2991                 //      die("poll!\n");
2992                 //}
2993
2994                 /// @todo enable support for events
2995
2996                 $datarray["uid"] = $importer["uid"];
2997                 $datarray["contact-id"] = $contact["id"];
2998                 $datarray["network"] = NETWORK_DIASPORA;
2999
3000                 $datarray["author-name"] = $contact["name"];
3001                 $datarray["author-link"] = $contact["url"];
3002                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
3003
3004                 $datarray["owner-name"] = $datarray["author-name"];
3005                 $datarray["owner-link"] = $datarray["author-link"];
3006                 $datarray["owner-avatar"] = $datarray["author-avatar"];
3007
3008                 $datarray["guid"] = $guid;
3009                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
3010
3011                 $datarray["verb"] = ACTIVITY_POST;
3012                 $datarray["gravity"] = GRAVITY_PARENT;
3013
3014                 $datarray["protocol"] = PROTOCOL_DIASPORA;
3015                 $datarray["source"] = $xml;
3016
3017                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
3018
3019                 if ($provider_display_name != "") {
3020                         $datarray["app"] = $provider_display_name;
3021                 }
3022
3023                 $datarray["plink"] = self::plink($author, $guid);
3024                 $datarray["private"] = (($public == "false") ? 1 : 0);
3025                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
3026
3027                 if (isset($address["address"])) {
3028                         $datarray["location"] = $address["address"];
3029                 }
3030
3031                 if (isset($address["lat"]) && isset($address["lng"])) {
3032                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
3033                 }
3034
3035                 self::fetchGuid($datarray);
3036                 $message_id = Item::insert($datarray);
3037
3038                 self::sendParticipation($contact, $datarray);
3039
3040                 if ($message_id) {
3041                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
3042                         if ($datarray['uid'] == 0) {
3043                                 Item::distribute($message_id);
3044                         }
3045                         return true;
3046                 } else {
3047                         return false;
3048                 }
3049         }
3050
3051         /* ************************************************************************************** *
3052          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
3053          * ************************************************************************************** */
3054
3055         /**
3056          * @brief returnes the handle of a contact
3057          *
3058          * @param array $contact contact array
3059          *
3060          * @return string the handle in the format user@domain.tld
3061          */
3062         private static function myHandle($contact)
3063         {
3064                 if ($contact["addr"] != "") {
3065                         return $contact["addr"];
3066                 }
3067
3068                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
3069                 // So - just in case - we build the the address here.
3070                 if ($contact["nickname"] != "") {
3071                         $nick = $contact["nickname"];
3072                 } else {
3073                         $nick = $contact["nick"];
3074                 }
3075
3076                 return $nick."@".substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
3077         }
3078
3079
3080         /**
3081          * @brief Creates the data for a private message in the new format
3082          *
3083          * @param string $msg     The message that is to be transmitted
3084          * @param array  $user    The record of the sender
3085          * @param array  $contact Target of the communication
3086          * @param string $prvkey  The private key of the sender
3087          * @param string $pubkey  The public key of the receiver
3088          *
3089          * @return string The encrypted data
3090          */
3091         public static function encodePrivateData($msg, $user, $contact, $prvkey, $pubkey)
3092         {
3093                 logger("Message: ".$msg, LOGGER_DATA);
3094
3095                 // without a public key nothing will work
3096                 if (!$pubkey) {
3097                         logger("pubkey missing: contact id: ".$contact["id"]);
3098                         return false;
3099                 }
3100
3101                 $aes_key = openssl_random_pseudo_bytes(32);
3102                 $b_aes_key = base64_encode($aes_key);
3103                 $iv = openssl_random_pseudo_bytes(16);
3104                 $b_iv = base64_encode($iv);
3105
3106                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3107
3108                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3109
3110                 $encrypted_key_bundle = "";
3111                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3112
3113                 $json_object = json_encode(
3114                         ["aes_key" => base64_encode($encrypted_key_bundle),
3115                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3116                 );
3117
3118                 return $json_object;
3119         }
3120
3121         /**
3122          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3123          *
3124          * @param string $msg  The message that is to be transmitted
3125          * @param array  $user The record of the sender
3126          *
3127          * @return string The envelope
3128          */
3129         public static function buildMagicEnvelope($msg, $user)
3130         {
3131                 $b64url_data = base64url_encode($msg);
3132                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3133
3134                 $key_id = base64url_encode(self::myHandle($user));
3135                 $type = "application/xml";
3136                 $encoding = "base64url";
3137                 $alg = "RSA-SHA256";
3138                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
3139
3140                 // Fallback if the private key wasn't transmitted in the expected field
3141                 if ($user['uprvkey'] == "") {
3142                         $user['uprvkey'] = $user['prvkey'];
3143                 }
3144
3145                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3146                 $sig = base64url_encode($signature);
3147
3148                 $xmldata = ["me:env" => ["me:data" => $data,
3149                                                         "@attributes" => ["type" => $type],
3150                                                         "me:encoding" => $encoding,
3151                                                         "me:alg" => $alg,
3152                                                         "me:sig" => $sig,
3153                                                         "@attributes2" => ["key_id" => $key_id]]];
3154
3155                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3156
3157                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3158         }
3159
3160         /**
3161          * @brief Create the envelope for a message
3162          *
3163          * @param string $msg     The message that is to be transmitted
3164          * @param array  $user    The record of the sender
3165          * @param array  $contact Target of the communication
3166          * @param string $prvkey  The private key of the sender
3167          * @param string $pubkey  The public key of the receiver
3168          * @param bool   $public  Is the message public?
3169          *
3170          * @return string The message that will be transmitted to other servers
3171          */
3172         public static function buildMessage($msg, $user, $contact, $prvkey, $pubkey, $public = false)
3173         {
3174                 // The message is put into an envelope with the sender's signature
3175                 $envelope = self::buildMagicEnvelope($msg, $user);
3176
3177                 // Private messages are put into a second envelope, encrypted with the receivers public key
3178                 if (!$public) {
3179                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3180                 }
3181
3182                 return $envelope;
3183         }
3184
3185         /**
3186          * @brief Creates a signature for a message
3187          *
3188          * @param array $owner   the array of the owner of the message
3189          * @param array $message The message that is to be signed
3190          *
3191          * @return string The signature
3192          */
3193         private static function signature($owner, $message)
3194         {
3195                 $sigmsg = $message;
3196                 unset($sigmsg["author_signature"]);
3197                 unset($sigmsg["parent_author_signature"]);
3198
3199                 $signed_text = implode(";", $sigmsg);
3200
3201                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3202         }
3203
3204         /**
3205          * @brief Transmit a message to a target server
3206          *
3207          * @param array  $owner        the array of the item owner
3208          * @param array  $contact      Target of the communication
3209          * @param string $envelope     The message that is to be transmitted
3210          * @param bool   $public_batch Is it a public post?
3211          * @param bool   $queue_run    Is the transmission called from the queue?
3212          * @param string $guid         message guid
3213          *
3214          * @return int Result of the transmission
3215          */
3216         public static function transmit($owner, $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
3217         {
3218                 $a = get_app();
3219
3220                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3221                 if (!$enabled) {
3222                         return 200;
3223                 }
3224
3225                 $logid = random_string(4);
3226
3227                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3228
3229                 // We always try to use the data from the fcontact table.
3230                 // This is important for transmitting data to Friendica servers.
3231                 if (!empty($contact['addr'])) {
3232                         $fcontact = self::personByHandle($contact['addr']);
3233                         if (!empty($fcontact)) {
3234                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3235                         }
3236                 }
3237
3238                 if (!$dest_url) {
3239                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3240                         return 0;
3241                 }
3242
3243                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
3244
3245                 if (!$queue_run && Queue::wasDelayed($contact["id"])) {
3246                         $return_code = 0;
3247                 } else {
3248                         if (!intval(Config::get("system", "diaspora_test"))) {
3249                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3250
3251                                 Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3252                                 $return_code = $a->get_curl_code();
3253                         } else {
3254                                 logger("test_mode");
3255                                 return 200;
3256                         }
3257                 }
3258
3259                 logger("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3260
3261                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
3262                         if (!$no_queue && ($contact['contact-type'] != ACCOUNT_TYPE_RELAY)) {
3263                                 logger("queue message");
3264                                 // queue message for redelivery
3265                                 Queue::add($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3266                         }
3267
3268                         // The message could not be delivered. We mark the contact as "dead"
3269                         Contact::markForArchival($contact);
3270                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3271                         // We successfully delivered a message, the contact is alive
3272                         Contact::unmarkForArchival($contact);
3273                 }
3274
3275                 return $return_code ? $return_code : -1;
3276         }
3277
3278
3279         /**
3280          * @brief Build the post xml
3281          *
3282          * @param string $type    The message type
3283          * @param array  $message The message data
3284          *
3285          * @return string The post XML
3286          */
3287         public static function buildPostXml($type, $message)
3288         {
3289                 $data = [$type => $message];
3290
3291                 return XML::fromArray($data, $xml);
3292         }
3293
3294         /**
3295          * @brief Builds and transmit messages
3296          *
3297          * @param array  $owner        the array of the item owner
3298          * @param array  $contact      Target of the communication
3299          * @param string $type         The message type
3300          * @param array  $message      The message data
3301          * @param bool   $public_batch Is it a public post?
3302          * @param string $guid         message guid
3303          * @param bool   $spool        Should the transmission be spooled or transmitted?
3304          *
3305          * @return int Result of the transmission
3306          */
3307         private static function buildAndTransmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3308         {
3309                 $msg = self::buildPostXml($type, $message);
3310
3311                 logger('message: '.$msg, LOGGER_DATA);
3312                 logger('send guid '.$guid, LOGGER_DEBUG);
3313
3314                 // Fallback if the private key wasn't transmitted in the expected field
3315                 if ($owner['uprvkey'] == "") {
3316                         $owner['uprvkey'] = $owner['prvkey'];
3317                 }
3318
3319                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3320
3321                 if ($spool) {
3322                         Queue::add($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3323                         return true;
3324                 } else {
3325                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3326                 }
3327
3328                 logger("guid: ".$guid." result ".$return_code, LOGGER_DEBUG);
3329
3330                 return $return_code;
3331         }
3332
3333         /**
3334          * @brief sends a participation (Used to get all further updates)
3335          *
3336          * @param array $contact Target of the communication
3337          * @param array $item    Item array
3338          *
3339          * @return int The result of the transmission
3340          */
3341         private static function sendParticipation($contact, $item)
3342         {
3343                 // Don't send notifications for private postings
3344                 if ($item['private']) {
3345                         return;
3346                 }
3347
3348                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3349
3350                 $result = Cache::get($cachekey);
3351                 if (!is_null($result)) {
3352                         return;
3353                 }
3354
3355                 // Fetch some user id to have a valid handle to transmit the participation.
3356                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3357                 // If the item belongs to a user, we take this user id.
3358                 if ($item['uid'] == 0) {
3359                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3360                         $first_user = dba::selectFirst('user', ['uid'], $condition);
3361                         $owner = User::getOwnerDataById($first_user['uid']);
3362                 } else {
3363                         $owner = User::getOwnerDataById($item['uid']);
3364                 }
3365
3366                 $author = self::myHandle($owner);
3367
3368                 $message = ["author" => $author,
3369                                 "guid" => get_guid(32),
3370                                 "parent_type" => "Post",
3371                                 "parent_guid" => $item["guid"]];
3372
3373                 logger("Send participation for ".$item["guid"]." by ".$author, LOGGER_DEBUG);
3374
3375                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3376                 Cache::set($cachekey, $item["guid"], CACHE_QUARTER_HOUR);
3377
3378                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3379         }
3380
3381         /**
3382          * @brief sends an account migration
3383          *
3384          * @param array $owner   the array of the item owner
3385          * @param array $contact Target of the communication
3386          * @param int   $uid     User ID
3387          *
3388          * @return int The result of the transmission
3389          */
3390         public static function sendAccountMigration($owner, $contact, $uid)
3391         {
3392                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3393                 $profile = self::createProfileData($uid);
3394
3395                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3396                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3397
3398                 $message = ["author" => $old_handle,
3399                                 "profile" => $profile,
3400                                 "signature" => $signature];
3401
3402                 logger("Send account migration ".print_r($message, true), LOGGER_DEBUG);
3403
3404                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3405         }
3406
3407         /**
3408          * @brief Sends a "share" message
3409          *
3410          * @param array $owner   the array of the item owner
3411          * @param array $contact Target of the communication
3412          *
3413          * @return int The result of the transmission
3414          */
3415         public static function sendShare($owner, $contact)
3416         {
3417                 /**
3418                  * @todo support the different possible combinations of "following" and "sharing"
3419                  * Currently, Diaspora only interprets the "sharing" field
3420                  *
3421                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3422                  */
3423
3424                 /*
3425                 switch ($contact["rel"]) {
3426                         case CONTACT_IS_FRIEND:
3427                                 $following = true;
3428                                 $sharing = true;
3429                         case CONTACT_IS_SHARING:
3430                                 $following = false;
3431                                 $sharing = true;
3432                         case CONTACT_IS_FOLLOWER:
3433                                 $following = true;
3434                                 $sharing = false;
3435                 }
3436                 */
3437
3438                 $message = ["author" => self::myHandle($owner),
3439                                 "recipient" => $contact["addr"],
3440                                 "following" => "true",
3441                                 "sharing" => "true"];
3442
3443                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
3444
3445                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3446         }
3447
3448         /**
3449          * @brief sends an "unshare"
3450          *
3451          * @param array $owner   the array of the item owner
3452          * @param array $contact Target of the communication
3453          *
3454          * @return int The result of the transmission
3455          */
3456         public static function sendUnshare($owner, $contact)
3457         {
3458                 $message = ["author" => self::myHandle($owner),
3459                                 "recipient" => $contact["addr"],
3460                                 "following" => "false",
3461                                 "sharing" => "false"];
3462
3463                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
3464
3465                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3466         }
3467
3468         /**
3469          * @brief Checks a message body if it is a reshare
3470          *
3471          * @param string $body     The message body that is to be check
3472          * @param bool   $complete Should it be a complete check or a simple check?
3473          *
3474          * @return array|bool Reshare details or "false" if no reshare
3475          */
3476         public static function isReshare($body, $complete = true)
3477         {
3478                 $body = trim($body);
3479
3480                 // Skip if it isn't a pure repeated messages
3481                 // Does it start with a share?
3482                 if ((strpos($body, "[share") > 0) && $complete) {
3483                         return false;
3484                 }
3485
3486                 // Does it end with a share?
3487                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3488                         return false;
3489                 }
3490
3491                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3492                 // Skip if there is no shared message in there
3493                 if ($body == $attributes) {
3494                         return false;
3495                 }
3496
3497                 // If we don't do the complete check we quit here
3498
3499                 $guid = "";
3500                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3501                 if ($matches[1] != "") {
3502                         $guid = $matches[1];
3503                 }
3504
3505                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3506                 if ($matches[1] != "") {
3507                         $guid = $matches[1];
3508                 }
3509
3510                 if (($guid != "") && $complete) {
3511                         $condition = ['guid' => $guid, 'network' => [NETWORK_DFRN, NETWORK_DIASPORA]];
3512                         $item = dba::selectFirst('item', ['contact-id'], $condition);
3513                         if (DBM::is_result($item)) {
3514                                 $ret= [];
3515                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3516                                 $ret["root_guid"] = $guid;
3517                                 return $ret;
3518                         } elseif ($complete) {
3519                                 // We are resharing something that isn't a DFRN or Diaspora post.
3520                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3521                                 return false;
3522                         }
3523                 } elseif (($guid == "") && $complete) {
3524                         return false;
3525                 }
3526
3527                 $ret["root_guid"] = $guid;
3528
3529                 $profile = "";
3530                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3531                 if ($matches[1] != "") {
3532                         $profile = $matches[1];
3533                 }
3534
3535                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3536                 if ($matches[1] != "") {
3537                         $profile = $matches[1];
3538                 }
3539
3540                 $ret= [];
3541
3542                 if ($profile != "") {
3543                         if (Contact::getIdForURL($profile)) {
3544                                 $author = Contact::getDetailsByURL($profile);
3545                                 $ret["root_handle"] = $author['addr'];
3546                         }
3547                 }
3548
3549                 if (empty($ret) && !$complete) {
3550                         return true;
3551                 }
3552
3553                 return $ret;
3554         }
3555
3556         /**
3557          * @brief Create an event array
3558          *
3559          * @param integer $event_id The id of the event
3560          *
3561          * @return array with event data
3562          */
3563         private static function buildEvent($event_id)
3564         {
3565                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3566                 if (!DBM::is_result($r)) {
3567                         return [];
3568                 }
3569
3570                 $event = $r[0];
3571
3572                 $eventdata = [];
3573
3574                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3575                 if (!DBM::is_result($r)) {
3576                         return [];
3577                 }
3578
3579                 $user = $r[0];
3580
3581                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3582                 if (!DBM::is_result($r)) {
3583                         return [];
3584                 }
3585
3586                 $owner = $r[0];
3587
3588                 $eventdata['author'] = self::myHandle($owner);
3589
3590                 if ($event['guid']) {
3591                         $eventdata['guid'] = $event['guid'];
3592                 }
3593
3594                 $mask = DateTimeFormat::ATOM;
3595
3596                 /// @todo - establish "all day" events in Friendica
3597                 $eventdata["all_day"] = "false";
3598
3599                 if (!$event['adjust']) {
3600                         $eventdata['timezone'] = $user['timezone'];
3601
3602                         if ($eventdata['timezone'] == "") {
3603                                 $eventdata['timezone'] = 'UTC';
3604                         }
3605                 }
3606
3607                 if ($event['start']) {
3608                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3609                 }
3610                 if ($event['finish'] && !$event['nofinish']) {
3611                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3612                 }
3613                 if ($event['summary']) {
3614                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3615                 }
3616                 if ($event['desc']) {
3617                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3618                 }
3619                 if ($event['location']) {
3620                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3621                         $coord = Map::getCoordinates($event['location']);
3622
3623                         $location = [];
3624                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3625                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3626                                 $location["lat"] = $coord['lat'];
3627                                 $location["lng"] = $coord['lon'];
3628                         } else {
3629                                 $location["lat"] = 0;
3630                                 $location["lng"] = 0;
3631                         }
3632                         $eventdata['location'] = $location;
3633                 }
3634
3635                 return $eventdata;
3636         }
3637
3638         /**
3639          * @brief Create a post (status message or reshare)
3640          *
3641          * @param array $item  The item that will be exported
3642          * @param array $owner the array of the item owner
3643          *
3644          * @return array
3645          * 'type' -> Message type ("status_message" or "reshare")
3646          * 'message' -> Array of XML elements of the status
3647          */
3648         public static function buildStatus($item, $owner)
3649         {
3650                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3651
3652                 $result = Cache::get($cachekey);
3653                 if (!is_null($result)) {
3654                         return $result;
3655                 }
3656
3657                 $myaddr = self::myHandle($owner);
3658
3659                 $public = (($item["private"]) ? "false" : "true");
3660
3661                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3662
3663                 // Detect a share element and do a reshare
3664                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3665                         $message = ["author" => $myaddr,
3666                                         "guid" => $item["guid"],
3667                                         "created_at" => $created,
3668                                         "root_author" => $ret["root_handle"],
3669                                         "root_guid" => $ret["root_guid"],
3670                                         "provider_display_name" => $item["app"],
3671                                         "public" => $public];
3672
3673                         $type = "reshare";
3674                 } else {
3675                         $title = $item["title"];
3676                         $body = $item["body"];
3677
3678                         if ($item['author-link'] != $item['owner-link']) {
3679                                 require_once 'mod/share.php';
3680                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3681                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3682                         }
3683
3684                         // convert to markdown
3685                         $body = html_entity_decode(BBCode::toMarkdown($body));
3686
3687                         // Adding the title
3688                         if (strlen($title)) {
3689                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3690                         }
3691
3692                         if ($item["attach"]) {
3693                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3694                                 if (cnt) {
3695                                         $body .= "\n".L10n::t("Attachments:")."\n";
3696                                         foreach ($matches as $mtch) {
3697                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3698                                         }
3699                                 }
3700                         }
3701
3702                         $location = [];
3703
3704                         if ($item["location"] != "")
3705                                 $location["address"] = $item["location"];
3706
3707                         if ($item["coord"] != "") {
3708                                 $coord = explode(" ", $item["coord"]);
3709                                 $location["lat"] = $coord[0];
3710                                 $location["lng"] = $coord[1];
3711                         }
3712
3713                         $message = ["author" => $myaddr,
3714                                         "guid" => $item["guid"],
3715                                         "created_at" => $created,
3716                                         "public" => $public,
3717                                         "text" => $body,
3718                                         "provider_display_name" => $item["app"],
3719                                         "location" => $location];
3720
3721                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3722                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3723                                 unset($message["location"]);
3724                         }
3725
3726                         if ($item['event-id'] > 0) {
3727                                 $event = self::buildEvent($item['event-id']);
3728                                 if (count($event)) {
3729                                         $message['event'] = $event;
3730
3731                                         if (!empty($event['location']['address']) &&
3732                                                 !empty($event['location']['lat']) &&
3733                                                 !empty($event['location']['lng'])) {
3734                                                 $message['location'] = $event['location'];
3735                                         }
3736
3737                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3738                                         // $message['text'] = '';
3739                                 }
3740                         }
3741
3742                         $type = "status_message";
3743                 }
3744
3745                 $msg = ["type" => $type, "message" => $message];
3746
3747                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3748
3749                 return $msg;
3750         }
3751
3752         /**
3753          * @brief Sends a post
3754          *
3755          * @param array $item         The item that will be exported
3756          * @param array $owner        the array of the item owner
3757          * @param array $contact      Target of the communication
3758          * @param bool  $public_batch Is it a public post?
3759          *
3760          * @return int The result of the transmission
3761          */
3762         public static function sendStatus($item, $owner, $contact, $public_batch = false)
3763         {
3764                 $status = self::buildStatus($item, $owner);
3765
3766                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3767         }
3768
3769         /**
3770          * @brief Creates a "like" object
3771          *
3772          * @param array $item  The item that will be exported
3773          * @param array $owner the array of the item owner
3774          *
3775          * @return array The data for a "like"
3776          */
3777         private static function constructLike($item, $owner)
3778         {
3779                 $p = q(
3780                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3781                         dbesc($item["thr-parent"])
3782                 );
3783                 if (!DBM::is_result($p)) {
3784                         return false;
3785                 }
3786
3787                 $parent = $p[0];
3788
3789                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3790                 $positive = null;
3791                 if ($item['verb'] === ACTIVITY_LIKE) {
3792                         $positive = "true";
3793                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3794                         $positive = "false";
3795                 }
3796
3797                 return(["author" => self::myHandle($owner),
3798                                 "guid" => $item["guid"],
3799                                 "parent_guid" => $parent["guid"],
3800                                 "parent_type" => $target_type,
3801                                 "positive" => $positive,
3802                                 "author_signature" => ""]);
3803         }
3804
3805         /**
3806          * @brief Creates an "EventParticipation" object
3807          *
3808          * @param array $item  The item that will be exported
3809          * @param array $owner the array of the item owner
3810          *
3811          * @return array The data for an "EventParticipation"
3812          */
3813         private static function constructAttend($item, $owner)
3814         {
3815                 $p = q(
3816                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3817                         dbesc($item["thr-parent"])
3818                 );
3819                 if (!DBM::is_result($p)) {
3820                         return false;
3821                 }
3822
3823                 $parent = $p[0];
3824
3825                 switch ($item['verb']) {
3826                         case ACTIVITY_ATTEND:
3827                                 $attend_answer = 'accepted';
3828                                 break;
3829                         case ACTIVITY_ATTENDNO:
3830                                 $attend_answer = 'declined';
3831                                 break;
3832                         case ACTIVITY_ATTENDMAYBE:
3833                                 $attend_answer = 'tentative';
3834                                 break;
3835                         default:
3836                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3837                                 return false;
3838                 }
3839
3840                 return(["author" => self::myHandle($owner),
3841                                 "guid" => $item["guid"],
3842                                 "parent_guid" => $parent["guid"],
3843                                 "status" => $attend_answer,
3844                                 "author_signature" => ""]);
3845         }
3846
3847         /**
3848          * @brief Creates the object for a comment
3849          *
3850          * @param array $item  The item that will be exported
3851          * @param array $owner the array of the item owner
3852          *
3853          * @return array The data for a comment
3854          */
3855         private static function constructComment($item, $owner)
3856         {
3857                 $cachekey = "diaspora:constructComment:".$item['guid'];
3858
3859                 $result = Cache::get($cachekey);
3860                 if (!is_null($result)) {
3861                         return $result;
3862                 }
3863
3864                 $p = q(
3865                         "SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3866                         intval($item["parent"]),
3867                         intval($item["parent"])
3868                 );
3869
3870                 if (!DBM::is_result($p)) {
3871                         return false;
3872                 }
3873
3874                 $parent = $p[0];
3875
3876                 $text = html_entity_decode(BBCode::toMarkdown($item["body"]));
3877                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3878
3879                 $comment = ["author" => self::myHandle($owner),
3880                                 "guid" => $item["guid"],
3881                                 "created_at" => $created,
3882                                 "parent_guid" => $parent["guid"],
3883                                 "text" => $text,
3884                                 "author_signature" => ""];
3885
3886                 // Send the thread parent guid only if it is a threaded comment
3887                 if ($item['thr-parent'] != $item['parent-uri']) {
3888                         $comment['thread_parent_guid'] = self::getGuidFromUri($item['thr-parent'], $item['uid']);
3889                 }
3890
3891                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3892
3893                 return($comment);
3894         }
3895
3896         /**
3897          * @brief Send a like or a comment
3898          *
3899          * @param array $item         The item that will be exported
3900          * @param array $owner        the array of the item owner
3901          * @param array $contact      Target of the communication
3902          * @param bool  $public_batch Is it a public post?
3903          *
3904          * @return int The result of the transmission
3905          */
3906         public static function sendFollowup($item, $owner, $contact, $public_batch = false)
3907         {
3908                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3909                         $message = self::constructAttend($item, $owner);
3910                         $type = "event_participation";
3911                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3912                         $message = self::constructLike($item, $owner);
3913                         $type = "like";
3914                 } else {
3915                         $message = self::constructComment($item, $owner);
3916                         $type = "comment";
3917                 }
3918
3919                 if (!$message) {
3920                         return false;
3921                 }
3922
3923                 $message["author_signature"] = self::signature($owner, $message);
3924
3925                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3926         }
3927
3928         /**
3929          * @brief Creates a message from a signature record entry
3930          *
3931          * @param array $item      The item that will be exported
3932          * @param array $signature The entry of the "sign" record
3933          *
3934          * @return string The message
3935          */
3936         private static function messageFromSignature($item, $signature)
3937         {
3938                 // Split the signed text
3939                 $signed_parts = explode(";", $signature['signed_text']);
3940
3941                 if ($item["deleted"]) {
3942                         $message = ["author" => $signature['signer'],
3943                                         "target_guid" => $signed_parts[0],
3944                                         "target_type" => $signed_parts[1]];
3945                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3946                         $message = ["author" => $signed_parts[4],
3947                                         "guid" => $signed_parts[1],
3948                                         "parent_guid" => $signed_parts[3],
3949                                         "parent_type" => $signed_parts[2],
3950                                         "positive" => $signed_parts[0],
3951                                         "author_signature" => $signature['signature'],
3952                                         "parent_author_signature" => ""];
3953                 } else {
3954                         // Remove the comment guid
3955                         $guid = array_shift($signed_parts);
3956
3957                         // Remove the parent guid
3958                         $parent_guid = array_shift($signed_parts);
3959
3960                         // Remove the handle
3961                         $handle = array_pop($signed_parts);
3962
3963                         // Glue the parts together
3964                         $text = implode(";", $signed_parts);
3965
3966                         $message = ["author" => $handle,
3967                                         "guid" => $guid,
3968                                         "parent_guid" => $parent_guid,
3969                                         "text" => implode(";", $signed_parts),
3970                                         "author_signature" => $signature['signature'],
3971                                         "parent_author_signature" => ""];
3972                 }
3973                 return $message;
3974         }
3975
3976         /**
3977          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3978          *
3979          * @param array $item         The item that will be exported
3980          * @param array $owner        the array of the item owner
3981          * @param array $contact      Target of the communication
3982          * @param bool  $public_batch Is it a public post?
3983          *
3984          * @return int The result of the transmission
3985          */
3986         public static function sendRelay($item, $owner, $contact, $public_batch = false)
3987         {
3988                 if ($item["deleted"]) {
3989                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3990                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3991                         $type = "like";
3992                 } else {
3993                         $type = "comment";
3994                 }
3995
3996                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3997
3998                 // fetch the original signature
3999
4000                 $r = q(
4001                         "SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
4002                         intval($item["id"])
4003                 );
4004
4005                 if (!$r) {
4006                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
4007                         return false;
4008                 }
4009
4010                 $signature = $r[0];
4011
4012                 // Old way - is used by the internal Friendica functions
4013                 /// @todo Change all signatur storing functions to the new format
4014                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer']) {
4015                         $message = self::messageFromSignature($item, $signature);
4016                 } else {// New way
4017                         $msg = json_decode($signature['signed_text'], true);
4018
4019                         $message = [];
4020                         if (is_array($msg)) {
4021                                 foreach ($msg as $field => $data) {
4022                                         if (!$item["deleted"]) {
4023                                                 if ($field == "diaspora_handle") {
4024                                                         $field = "author";
4025                                                 }
4026                                                 if ($field == "target_type") {
4027                                                         $field = "parent_type";
4028                                                 }
4029                                         }
4030
4031                                         $message[$field] = $data;
4032                                 }
4033                         } else {
4034                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
4035                         }
4036                 }
4037
4038                 $message["parent_author_signature"] = self::signature($owner, $message);
4039
4040                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
4041
4042                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
4043         }
4044
4045         /**
4046          * @brief Sends a retraction (deletion) of a message, like or comment
4047          *
4048          * @param array $item         The item that will be exported
4049          * @param array $owner        the array of the item owner
4050          * @param array $contact      Target of the communication
4051          * @param bool  $public_batch Is it a public post?
4052          * @param bool  $relay        Is the retraction transmitted from a relay?
4053          *
4054          * @return int The result of the transmission
4055          */
4056         public static function sendRetraction($item, $owner, $contact, $public_batch = false, $relay = false)
4057         {
4058                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
4059
4060                 $msg_type = "retraction";
4061
4062                 if ($item['id'] == $item['parent']) {
4063                         $target_type = "Post";
4064                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4065                         $target_type = "Like";
4066                 } else {
4067                         $target_type = "Comment";
4068                 }
4069
4070                 $message = ["author" => $itemaddr,
4071                                 "target_guid" => $item['guid'],
4072                                 "target_type" => $target_type];
4073
4074                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
4075
4076                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
4077         }
4078
4079         /**
4080          * @brief Sends a mail
4081          *
4082          * @param array $item    The item that will be exported
4083          * @param array $owner   The owner
4084          * @param array $contact Target of the communication
4085          *
4086          * @return int The result of the transmission
4087          */
4088         public static function sendMail($item, $owner, $contact)
4089         {
4090                 $myaddr = self::myHandle($owner);
4091
4092                 $r = q(
4093                         "SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
4094                         intval($item["convid"]),
4095                         intval($item["uid"])
4096                 );
4097
4098                 if (!DBM::is_result($r)) {
4099                         logger("conversation not found.");
4100                         return;
4101                 }
4102                 $cnv = $r[0];
4103
4104                 $conv = [
4105                         "author" => $cnv["creator"],
4106                         "guid" => $cnv["guid"],
4107                         "subject" => $cnv["subject"],
4108                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4109                         "participants" => $cnv["recips"]
4110                 ];
4111
4112                 $body = BBCode::toMarkdown($item["body"]);
4113                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4114
4115                 $msg = [
4116                         "author" => $myaddr,
4117                         "guid" => $item["guid"],
4118                         "conversation_guid" => $cnv["guid"],
4119                         "text" => $body,
4120                         "created_at" => $created,
4121                 ];
4122
4123                 if ($item["reply"]) {
4124                         $message = $msg;
4125                         $type = "message";
4126                 } else {
4127                         $message = [
4128                                         "author" => $cnv["creator"],
4129                                         "guid" => $cnv["guid"],
4130                                         "subject" => $cnv["subject"],
4131                                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4132                                         "participants" => $cnv["recips"],
4133                                         "message" => $msg];
4134
4135                         $type = "conversation";
4136                 }
4137
4138                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4139         }
4140
4141         /**
4142          * @brief Split a name into first name and last name
4143          *
4144          * @param string $name The name
4145          *
4146          * @return array The array with "first" and "last"
4147          */
4148         public static function splitName($name) {
4149                 $name = trim($name);
4150
4151                 // Is the name longer than 64 characters? Then cut the rest of it.
4152                 if (strlen($name) > 64) {
4153                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4154                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4155                         } else {
4156                                 $name = substr($name, 0, 64);
4157                         }
4158                 }
4159
4160                 // Take the first word as first name
4161                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4162                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4163                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4164                         return ['first' => $first, 'last' => $last];
4165                 }
4166
4167                 // Take the last word as last name
4168                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4169                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4170
4171                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4172                         return ['first' => $first, 'last' => $last];
4173                 }
4174
4175                 // Take the first 32 characters if there is no space in the first 32 characters
4176                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4177                         $first = substr($name, 0, 32);
4178                         $last = substr($name, 32);
4179                         return ['first' => $first, 'last' => $last];
4180                 }
4181
4182                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4183                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4184
4185                 // Check if the last name is longer than 32 characters
4186                 if (strlen($last) > 32) {
4187                         if (strpos($last, ' ') <= 32) {
4188                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4189                         } else {
4190                                 $last = substr($last, 0, 32);
4191                         }
4192                 }
4193
4194                 return ['first' => $first, 'last' => $last];
4195         }
4196
4197         /**
4198          * @brief Create profile data
4199          *
4200          * @param int $uid The user id
4201          *
4202          * @return array The profile data
4203          */
4204         private static function createProfileData($uid)
4205         {
4206                 $r = q(
4207                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4208                         FROM `profile`
4209                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4210                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4211                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4212                         intval($uid)
4213                 );
4214
4215                 if (!$r) {
4216                         return [];
4217                 }
4218
4219                 $profile = $r[0];
4220                 $handle = $profile["addr"];
4221
4222                 $split_name = self::splitName($profile['name']);
4223                 $first = $split_name['first'];
4224                 $last = $split_name['last'];
4225
4226                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4227                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4228                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4229                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4230
4231                 $dob = null;
4232                 $about = null;
4233                 $location = null;
4234                 $tags = null;
4235                 if ($searchable === 'true') {
4236                         $dob = '';
4237
4238                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4239                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4240                                 if ($year < 1004) {
4241                                         $year = 1004;
4242                                 }
4243                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4244                         }
4245
4246                         $about = $profile['about'];
4247                         $about = strip_tags(BBCode::convert($about));
4248
4249                         $location = Profile::formatLocation($profile);
4250                         $tags = '';
4251                         if ($profile['pub_keywords']) {
4252                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4253                                 $kw = str_replace('  ', ' ', $kw);
4254                                 $arr = explode(' ', $profile['pub_keywords']);
4255                                 if (count($arr)) {
4256                                         for ($x = 0; $x < 5; $x ++) {
4257                                                 if (trim($arr[$x])) {
4258                                                         $tags .= '#'. trim($arr[$x]) .' ';
4259                                                 }
4260                                         }
4261                                 }
4262                         }
4263                         $tags = trim($tags);
4264                 }
4265
4266                 return ["author" => $handle,
4267                                 "first_name" => $first,
4268                                 "last_name" => $last,
4269                                 "image_url" => $large,
4270                                 "image_url_medium" => $medium,
4271                                 "image_url_small" => $small,
4272                                 "birthday" => $dob,
4273                                 "gender" => $profile['gender'],
4274                                 "bio" => $about,
4275                                 "location" => $location,
4276                                 "searchable" => $searchable,
4277                                 "nsfw" => "false",
4278                                 "tag_string" => $tags];
4279         }
4280
4281         /**
4282          * @brief Sends profile data
4283          *
4284          * @param int  $uid    The user id
4285          * @param bool $recips optional, default false
4286          * @return void
4287          */
4288         public static function sendProfile($uid, $recips = false)
4289         {
4290                 if (!$uid) {
4291                         return;
4292                 }
4293
4294                 $owner = User::getOwnerDataById($uid);
4295                 if (!$owner) {
4296                         return;
4297                 }
4298
4299                 if (!$recips) {
4300                         $recips = q(
4301                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4302                                 AND `uid` = %d AND `rel` != %d",
4303                                 dbesc(NETWORK_DIASPORA),
4304                                 intval($uid),
4305                                 intval(CONTACT_IS_SHARING)
4306                         );
4307                 }
4308
4309                 if (!$recips) {
4310                         return;
4311                 }
4312
4313                 $message = self::createProfileData($uid);
4314
4315                 foreach ($recips as $recip) {
4316                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
4317                         self::buildAndTransmit($owner, $recip, "profile", $message, false, "", false);
4318                 }
4319         }
4320
4321         /**
4322          * @brief Stores the signature for likes that are created on our system
4323          *
4324          * @param array $contact The contact array of the "like"
4325          * @param int   $post_id The post id of the "like"
4326          *
4327          * @return bool Success
4328          */
4329         public static function storeLikeSignature($contact, $post_id)
4330         {
4331                 // Is the contact the owner? Then fetch the private key
4332                 if (!$contact['self'] || ($contact['uid'] == 0)) {
4333                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
4334                         return false;
4335                 }
4336
4337                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
4338                 if (!DBM::is_result($r)) {
4339                         return false;
4340                 }
4341
4342                 $contact["uprvkey"] = $r[0]['prvkey'];
4343
4344                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
4345                 if (!DBM::is_result($r)) {
4346                         return false;
4347                 }
4348
4349                 if (!in_array($r[0]["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4350                         return false;
4351                 }
4352
4353                 $message = self::constructLike($r[0], $contact);
4354                 if ($message === false) {
4355                         return false;
4356                 }
4357
4358                 $message["author_signature"] = self::signature($contact, $message);
4359
4360                 /*
4361                  * Now store the signature more flexible to dynamically support new fields.
4362                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4363                  */
4364                 dba::insert('sign', ['iid' => $post_id, 'signed_text' => json_encode($message)]);
4365
4366                 logger('Stored diaspora like signature');
4367                 return true;
4368         }
4369
4370         /**
4371          * @brief Stores the signature for comments that are created on our system
4372          *
4373          * @param array  $item       The item array of the comment
4374          * @param array  $contact    The contact array of the item owner
4375          * @param string $uprvkey    The private key of the sender
4376          * @param int    $message_id The message id of the comment
4377          *
4378          * @return bool Success
4379          */
4380         public static function storeCommentSignature($item, $contact, $uprvkey, $message_id)
4381         {
4382                 if ($uprvkey == "") {
4383                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
4384                         return false;
4385                 }
4386
4387                 $contact["uprvkey"] = $uprvkey;
4388
4389                 $message = self::constructComment($item, $contact);
4390                 if ($message === false) {
4391                         return false;
4392                 }
4393
4394                 $message["author_signature"] = self::signature($contact, $message);
4395
4396                 /*
4397                  * Now store the signature more flexible to dynamically support new fields.
4398                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4399                  */
4400                 dba::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($message)]);
4401
4402                 logger('Stored diaspora comment signature');
4403                 return true;
4404         }
4405 }