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\Feature;
  14 use Friendica\Content\Text\BBCode;
  15 use Friendica\Content\Text\Markdown;
  16 use Friendica\Core\Cache;
  17 use Friendica\Core\Config;
  18 use Friendica\Core\L10n;
  19 use Friendica\Core\Logger;
  20 use Friendica\Core\PConfig;
  21 use Friendica\Core\Protocol;
  22 use Friendica\Core\System;
  23 use Friendica\Core\Worker;
  24 use Friendica\Database\DBA;
  25 use Friendica\Model\Contact;
  26 use Friendica\Model\Conversation;
  27 use Friendica\Model\GContact;
  28 use Friendica\Model\Group;
  29 use Friendica\Model\Item;
  30 use Friendica\Model\Profile;
  31 use Friendica\Model\Queue;
  32 use Friendica\Model\User;
  33 use Friendica\Network\Probe;
  34 use Friendica\Util\Crypto;
  35 use Friendica\Util\DateTimeFormat;
  36 use Friendica\Util\Map;
  37 use Friendica\Util\Network;
  38 use Friendica\Util\Strings;
  39 use Friendica\Util\XML;
  40 use SimpleXMLElement;
  41
  42 /**
  43  * @brief This class contain functions to create and send Diaspora XML files
  44  *
  45  */
  46 class Diaspora
  47 {
  48         /**
  49          * @brief Return a list of relay servers
  50          *
  51          * The list contains not only the official relays but also servers that we serve directly
  52          *
  53          * @param integer $item_id  The id of the item that is sent
  54          * @param array   $contacts The previously fetched contacts
  55          *
  56          * @return array of relay servers
  57          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  58          */
  59         public static function relayList($item_id, array $contacts = [])
  60         {
  61                 $serverlist = [];
  62
  63                 // Fetching relay servers
  64                 $serverdata = Config::get("system", "relay_server");
  65
  66                 if (!empty($serverdata)) {
  67                         $servers = explode(",", $serverdata);
  68                         foreach ($servers as $server) {
  69                                 $serverlist[$server] = trim($server);
  70                         }
  71                 }
  72
  73                 if (Config::get("system", "relay_directly", false)) {
  74                         // We distribute our stuff based on the parent to ensure that the thread will be complete
  75                         $parent = Item::selectFirst(['parent'], ['id' => $item_id]);
  76                         if (!DBA::isResult($parent)) {
  77                                 return;
  78                         }
  79
  80                         // Servers that want to get all content
  81                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  82                         while ($server = DBA::fetch($servers)) {
  83                                 $serverlist[$server['url']] = $server['url'];
  84                         }
  85
  86                         // All tags of the current post
  87                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
  88                         $tags = DBA::select('term', ['term'], $condition);
  89                         $taglist = [];
  90                         while ($tag = DBA::fetch($tags)) {
  91                                 $taglist[] = $tag['term'];
  92                         }
  93
  94                         // All servers who wants content with this tag
  95                         $tagserverlist = [];
  96                         if (!empty($taglist)) {
  97                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  98                                 while ($server = DBA::fetch($tagserver)) {
  99                                         $tagserverlist[] = $server['gserver-id'];
 100                                 }
 101                         }
 102
 103                         // All adresses with the given id
 104                         if (!empty($tagserverlist)) {
 105                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 106                                 while ($server = DBA::fetch($servers)) {
 107                                         $serverlist[$server['url']] = $server['url'];
 108                                 }
 109                         }
 110                 }
 111
 112                 // Now we are collecting all relay contacts
 113                 foreach ($serverlist as $server_url) {
 114                         // We don't send messages to ourselves
 115                         if (Strings::compareLink($server_url, System::baseUrl())) {
 116                                 continue;
 117                         }
 118                         $contact = self::getRelayContact($server_url);
 119                         if (is_bool($contact)) {
 120                                 continue;
 121                         }
 122
 123                         $exists = false;
 124                         foreach ($contacts as $entry) {
 125                                 if ($entry['batch'] == $contact['batch']) {
 126                                         $exists = true;
 127                                 }
 128                         }
 129
 130                         if (!$exists) {
 131                                 $contacts[] = $contact;
 132                         }
 133                 }
 134
 135                 return $contacts;
 136         }
 137
 138         /**
 139          * @brief Return a contact for a given server address or creates a dummy entry
 140          *
 141          * @param string $server_url The url of the server
 142          * @return array with the contact
 143          * @throws \Exception
 144          */
 145         private static function getRelayContact($server_url)
 146         {
 147                 $fields = ['batch', 'id', 'name', 'network', 'archive', 'blocked'];
 148
 149                 // Fetch the relay contact
 150                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 151                         'contact-type' => Contact::TYPE_RELAY];
 152                 $contact = DBA::selectFirst('contact', $fields, $condition);
 153
 154                 if (DBA::isResult($contact)) {
 155                         if ($contact['archive'] || $contact['blocked']) {
 156                                 return false;
 157                         }
 158                         return $contact;
 159                 } else {
 160                         self::setRelayContact($server_url);
 161
 162                         $contact = DBA::selectFirst('contact', $fields, $condition);
 163                         if (DBA::isResult($contact)) {
 164                                 return $contact;
 165                         }
 166                 }
 167
 168                 // It should never happen that we arrive here
 169                 return [];
 170         }
 171
 172         /**
 173          * @brief Update or insert a relay contact
 174          *
 175          * @param string $server_url     The url of the server
 176          * @param array  $network_fields Optional network specific fields
 177          * @throws \Exception
 178          */
 179         public static function setRelayContact($server_url, array $network_fields = [])
 180         {
 181                 $fields = ['created' => DateTimeFormat::utcNow(),
 182                         'name' => 'relay', 'nick' => 'relay',
 183                         'url' => $server_url, 'network' => Protocol::DIASPORA,
 184                         'batch' => $server_url . '/receive/public',
 185                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 186                         'pending' => false, 'writable' => true];
 187
 188                 $fields = array_merge($fields, $network_fields);
 189
 190                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 191                         'contact-type' => Contact::TYPE_RELAY];
 192
 193                 if (DBA::exists('contact', $condition)) {
 194                         unset($fields['created']);
 195                 }
 196
 197                 DBA::update('contact', $fields, $condition, true);
 198         }
 199
 200         /**
 201          * @brief Return a list of participating contacts for a thread
 202          *
 203          * This is used for the participation feature.
 204          * One of the parameters is a contact array.
 205          * This is done to avoid duplicates.
 206          *
 207          * @param integer $thread   The id of the thread
 208          * @param array   $contacts The previously fetched contacts
 209          *
 210          * @return array of relay servers
 211          * @throws \Exception
 212          */
 213         public static function participantsForThread($thread, array $contacts)
 214         {
 215                 $r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
 216                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 217                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 218                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 219                                 WHERE `participation`.`iid` = ?", $thread);
 220
 221                 while ($contact = DBA::fetch($r)) {
 222                         if (!empty($contact['fnetwork'])) {
 223                                 $contact['network'] = $contact['fnetwork'];
 224                         }
 225                         unset($contact['fnetwork']);
 226
 227                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 228                                 $contact['batch'] = $contact['fbatch'];
 229                         }
 230                         unset($contact['fbatch']);
 231
 232                         $exists = false;
 233                         foreach ($contacts as $entry) {
 234                                 if ($entry['batch'] == $contact['batch']) {
 235                                         $exists = true;
 236                                 }
 237                         }
 238
 239                         if (!$exists) {
 240                                 $contacts[] = $contact;
 241                         }
 242                 }
 243                 DBA::close($r);
 244
 245                 return $contacts;
 246         }
 247
 248         /**
 249          * @brief repairs a signature that was double encoded
 250          *
 251          * The function is unused at the moment. It was copied from the old implementation.
 252          *
 253          * @param string  $signature The signature
 254          * @param string  $handle    The handle of the signature owner
 255          * @param integer $level     This value is only set inside this function to avoid endless loops
 256          *
 257          * @return string the repaired signature
 258          * @throws \Exception
 259          */
 260         private static function repairSignature($signature, $handle = "", $level = 1)
 261         {
 262                 if ($signature == "") {
 263                         return ($signature);
 264                 }
 265
 266                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 267                         $signature = base64_decode($signature);
 268                         Logger::log("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, Logger::DEBUG);
 269
 270                         // Do a recursive call to be able to fix even multiple levels
 271                         if ($level < 10) {
 272                                 $signature = self::repairSignature($signature, $handle, ++$level);
 273                         }
 274                 }
 275
 276                 return($signature);
 277         }
 278
 279         /**
 280          * @brief verify the envelope and return the verified data
 281          *
 282          * @param string $envelope The magic envelope
 283          *
 284          * @return string verified data
 285          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 286          * @throws \ImagickException
 287          */
 288         private static function verifyMagicEnvelope($envelope)
 289         {
 290                 $basedom = XML::parseString($envelope);
 291
 292                 if (!is_object($basedom)) {
 293                         Logger::log("Envelope is no XML file");
 294                         return false;
 295                 }
 296
 297                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 298
 299                 if (sizeof($children) == 0) {
 300                         Logger::log("XML has no children");
 301                         return false;
 302                 }
 303
 304                 $handle = "";
 305
 306                 $data = Strings::base64UrlDecode($children->data);
 307                 $type = $children->data->attributes()->type[0];
 308
 309                 $encoding = $children->encoding;
 310
 311                 $alg = $children->alg;
 312
 313                 $sig = Strings::base64UrlDecode($children->sig);
 314                 $key_id = $children->sig->attributes()->key_id[0];
 315                 if ($key_id != "") {
 316                         $handle = Strings::base64UrlDecode($key_id);
 317                 }
 318
 319                 $b64url_data = Strings::base64UrlEncode($data);
 320                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 321
 322                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 323
 324                 if ($handle == '') {
 325                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 326                         return false;
 327                 }
 328
 329                 $key = self::key($handle);
 330                 if ($key == '') {
 331                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 332                         return false;
 333                 }
 334
 335                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 336                 if (!$verify) {
 337                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 338                         return false;
 339                 }
 340
 341                 return $data;
 342         }
 343
 344         /**
 345          * @brief encrypts data via AES
 346          *
 347          * @param string $key  The AES key
 348          * @param string $iv   The IV (is used for CBC encoding)
 349          * @param string $data The data that is to be encrypted
 350          *
 351          * @return string encrypted data
 352          */
 353         private static function aesEncrypt($key, $iv, $data)
 354         {
 355                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 356         }
 357
 358         /**
 359          * @brief decrypts data via AES
 360          *
 361          * @param string $key       The AES key
 362          * @param string $iv        The IV (is used for CBC encoding)
 363          * @param string $encrypted The encrypted data
 364          *
 365          * @return string decrypted data
 366          */
 367         private static function aesDecrypt($key, $iv, $encrypted)
 368         {
 369                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 370         }
 371
 372         /**
 373          * @brief: Decodes incoming Diaspora message in the new format
 374          *
 375          * @param array   $importer Array of the importer user
 376          * @param string  $raw      raw post message
 377          * @param boolean $no_exit  Don't do an http exit on error
 378          *
 379          * @return array
 380          * 'message' -> decoded Diaspora XML message
 381          * 'author' -> author diaspora handle
 382          * 'key' -> author public key (converted to pkcs#8)
 383          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 384          * @throws \ImagickException
 385          */
 386         public static function decodeRaw(array $importer, $raw, $no_exit = false)
 387         {
 388                 $data = json_decode($raw);
 389
 390                 // Is it a private post? Then decrypt the outer Salmon
 391                 if (is_object($data)) {
 392                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 393                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 394
 395                         $outer_key_bundle = '';
 396                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 397                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 398
 399                         if (!is_object($j_outer_key_bundle)) {
 400                                 Logger::log('Outer Salmon did not verify. Discarding.');
 401                                 if ($no_exit) {
 402                                         return false;
 403                                 } else {
 404                                         System::httpExit(400);
 405                                 }
 406                         }
 407
 408                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 409                         $outer_key = base64_decode($j_outer_key_bundle->key);
 410
 411                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 412                 } else {
 413                         $xml = $raw;
 414                 }
 415
 416                 $basedom = XML::parseString($xml);
 417
 418                 if (!is_object($basedom)) {
 419                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 420                         if ($no_exit) {
 421                                 return false;
 422                         } else {
 423                                 System::httpExit(400);
 424                         }
 425                 }
 426
 427                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 428
 429                 // Not sure if this cleaning is needed
 430                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 431
 432                 // Build the signed data
 433                 $type = $base->data[0]->attributes()->type[0];
 434                 $encoding = $base->encoding;
 435                 $alg = $base->alg;
 436                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 437
 438                 // This is the signature
 439                 $signature = Strings::base64UrlDecode($base->sig);
 440
 441                 // Get the senders' public key
 442                 $key_id = $base->sig[0]->attributes()->key_id[0];
 443                 $author_addr = base64_decode($key_id);
 444                 if ($author_addr == '') {
 445                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 446                         if ($no_exit) {
 447                                 return false;
 448                         } else {
 449                                 System::httpExit(400);
 450                         }
 451                 }
 452
 453                 $key = self::key($author_addr);
 454                 if ($key == '') {
 455                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 456                         if ($no_exit) {
 457                                 return false;
 458                         } else {
 459                                 System::httpExit(400);
 460                         }
 461                 }
 462
 463                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 464                 if (!$verify) {
 465                         Logger::log('Message did not verify. Discarding.');
 466                         if ($no_exit) {
 467                                 return false;
 468                         } else {
 469                                 System::httpExit(400);
 470                         }
 471                 }
 472
 473                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 474                                 'author' => XML::unescape($author_addr),
 475                                 'key' => (string)$key];
 476         }
 477
 478         /**
 479          * @brief: Decodes incoming Diaspora message in the deprecated format
 480          *
 481          * @param array  $importer Array of the importer user
 482          * @param string $xml      urldecoded Diaspora salmon
 483          *
 484          * @return array
 485          * 'message' -> decoded Diaspora XML message
 486          * 'author' -> author diaspora handle
 487          * 'key' -> author public key (converted to pkcs#8)
 488          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 489          * @throws \ImagickException
 490          */
 491         public static function decode(array $importer, $xml)
 492         {
 493                 $public = false;
 494                 $basedom = XML::parseString($xml);
 495
 496                 if (!is_object($basedom)) {
 497                         Logger::log("XML is not parseable.");
 498                         return false;
 499                 }
 500                 $children = $basedom->children('https://joindiaspora.com/protocol');
 501
 502                 $inner_aes_key = null;
 503                 $inner_iv = null;
 504
 505                 if ($children->header) {
 506                         $public = true;
 507                         $author_link = str_replace('acct:', '', $children->header->author_id);
 508                 } else {
 509                         // This happens with posts from a relais
 510                         if (!$importer) {
 511                                 Logger::log("This is no private post in the old format", Logger::DEBUG);
 512                                 return false;
 513                         }
 514
 515                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 516
 517                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 518                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 519
 520                         $outer_key_bundle = '';
 521                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 522
 523                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 524
 525                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 526                         $outer_key = base64_decode($j_outer_key_bundle->key);
 527
 528                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 529
 530                         Logger::log('decrypted: '.$decrypted, Logger::DEBUG);
 531                         $idom = XML::parseString($decrypted);
 532
 533                         $inner_iv = base64_decode($idom->iv);
 534                         $inner_aes_key = base64_decode($idom->aes_key);
 535
 536                         $author_link = str_replace('acct:', '', $idom->author_id);
 537                 }
 538
 539                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 540
 541                 // figure out where in the DOM tree our data is hiding
 542
 543                 $base = null;
 544                 if ($dom->provenance->data) {
 545                         $base = $dom->provenance;
 546                 } elseif ($dom->env->data) {
 547                         $base = $dom->env;
 548                 } elseif ($dom->data) {
 549                         $base = $dom;
 550                 }
 551
 552                 if (!$base) {
 553                         Logger::log('unable to locate salmon data in xml');
 554                         System::httpExit(400);
 555                 }
 556
 557
 558                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 559                 $signature = Strings::base64UrlDecode($base->sig);
 560
 561                 // unpack the  data
 562
 563                 // strip whitespace so our data element will return to one big base64 blob
 564                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 565
 566
 567                 // stash away some other stuff for later
 568
 569                 $type = $base->data[0]->attributes()->type[0];
 570                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 571                 $encoding = $base->encoding;
 572                 $alg = $base->alg;
 573
 574
 575                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 576
 577
 578                 // decode the data
 579                 $data = Strings::base64UrlDecode($data);
 580
 581
 582                 if ($public) {
 583                         $inner_decrypted = $data;
 584                 } else {
 585                         // Decode the encrypted blob
 586                         $inner_encrypted = base64_decode($data);
 587                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 588                 }
 589
 590                 if (!$author_link) {
 591                         Logger::log('Could not retrieve author URI.');
 592                         System::httpExit(400);
 593                 }
 594                 // Once we have the author URI, go to the web and try to find their public key
 595                 // (first this will look it up locally if it is in the fcontact cache)
 596                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 597
 598                 Logger::log('Fetching key for '.$author_link);
 599                 $key = self::key($author_link);
 600
 601                 if (!$key) {
 602                         Logger::log('Could not retrieve author key.');
 603                         System::httpExit(400);
 604                 }
 605
 606                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 607
 608                 if (!$verify) {
 609                         Logger::log('Message did not verify. Discarding.');
 610                         System::httpExit(400);
 611                 }
 612
 613                 Logger::log('Message verified.');
 614
 615                 return ['message' => (string)$inner_decrypted,
 616                                 'author' => XML::unescape($author_link),
 617                                 'key' => (string)$key];
 618         }
 619
 620
 621         /**
 622          * @brief Dispatches public messages and find the fitting receivers
 623          *
 624          * @param array $msg The post that will be dispatched
 625          *
 626          * @return int The message id of the generated message, "true" or "false" if there was an error
 627          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 628          * @throws \ImagickException
 629          */
 630         public static function dispatchPublic($msg)
 631         {
 632                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 633                 if (!$enabled) {
 634                         Logger::log("diaspora is disabled");
 635                         return false;
 636                 }
 637
 638                 if (!($fields = self::validPosting($msg))) {
 639                         Logger::log("Invalid posting");
 640                         return false;
 641                 }
 642
 643                 $importer = ["uid" => 0, "page-flags" => User::PAGE_FLAGS_FREELOVE];
 644                 $success = self::dispatch($importer, $msg, $fields);
 645
 646                 return $success;
 647         }
 648
 649         /**
 650          * @brief Dispatches the different message types to the different functions
 651          *
 652          * @param array            $importer Array of the importer user
 653          * @param array            $msg      The post that will be dispatched
 654          * @param SimpleXMLElement $fields   SimpleXML object that contains the message
 655          *
 656          * @return int The message id of the generated message, "true" or "false" if there was an error
 657          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 658          * @throws \ImagickException
 659          */
 660         public static function dispatch(array $importer, $msg, SimpleXMLElement $fields = null)
 661         {
 662                 // The sender is the handle of the contact that sent the message.
 663                 // This will often be different with relayed messages (for example "like" and "comment")
 664                 $sender = $msg["author"];
 665
 666                 // This is only needed for private postings since this is already done for public ones before
 667                 if (is_null($fields)) {
 668                         $private = true;
 669                         if (!($fields = self::validPosting($msg))) {
 670                                 Logger::log("Invalid posting");
 671                                 return false;
 672                         }
 673                 } else {
 674                         $private = false;
 675                 }
 676
 677                 $type = $fields->getName();
 678
 679                 Logger::log("Received message type ".$type." from ".$sender." for user ".$importer["uid"], Logger::DEBUG);
 680
 681                 switch ($type) {
 682                         case "account_migration":
 683                                 if (!$private) {
 684                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 685                                         return false;
 686                                 }
 687                                 return self::receiveAccountMigration($importer, $fields);
 688
 689                         case "account_deletion":
 690                                 return self::receiveAccountDeletion($fields);
 691
 692                         case "comment":
 693                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 694
 695                         case "contact":
 696                                 if (!$private) {
 697                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 698                                         return false;
 699                                 }
 700                                 return self::receiveContactRequest($importer, $fields);
 701
 702                         case "conversation":
 703                                 if (!$private) {
 704                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 705                                         return false;
 706                                 }
 707                                 return self::receiveConversation($importer, $msg, $fields);
 708
 709                         case "like":
 710                                 return self::receiveLike($importer, $sender, $fields);
 711
 712                         case "message":
 713                                 if (!$private) {
 714                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 715                                         return false;
 716                                 }
 717                                 return self::receiveMessage($importer, $fields);
 718
 719                         case "participation":
 720                                 if (!$private) {
 721                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 722                                         return false;
 723                                 }
 724                                 return self::receiveParticipation($importer, $fields);
 725
 726                         case "photo": // Not implemented
 727                                 return self::receivePhoto($importer, $fields);
 728
 729                         case "poll_participation": // Not implemented
 730                                 return self::receivePollParticipation($importer, $fields);
 731
 732                         case "profile":
 733                                 if (!$private) {
 734                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 735                                         return false;
 736                                 }
 737                                 return self::receiveProfile($importer, $fields);
 738
 739                         case "reshare":
 740                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 741
 742                         case "retraction":
 743                                 return self::receiveRetraction($importer, $sender, $fields);
 744
 745                         case "status_message":
 746                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 747
 748                         default:
 749                                 Logger::log("Unknown message type ".$type);
 750                                 return false;
 751                 }
 752         }
 753
 754         /**
 755          * @brief Checks if a posting is valid and fetches the data fields.
 756          *
 757          * This function does not only check the signature.
 758          * It also does the conversion between the old and the new diaspora format.
 759          *
 760          * @param array $msg Array with the XML, the sender handle and the sender signature
 761          *
 762          * @return bool|SimpleXMLElement If the posting is valid then an array with an SimpleXML object is returned
 763          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 764          * @throws \ImagickException
 765          */
 766         private static function validPosting($msg)
 767         {
 768                 $data = XML::parseString($msg["message"]);
 769
 770                 if (!is_object($data)) {
 771                         Logger::log("No valid XML ".$msg["message"], Logger::DEBUG);
 772                         return false;
 773                 }
 774
 775                 // Is this the new or the old version?
 776                 if ($data->getName() == "XML") {
 777                         $oldXML = true;
 778                         foreach ($data->post->children() as $child) {
 779                                 $element = $child;
 780                         }
 781                 } else {
 782                         $oldXML = false;
 783                         $element = $data;
 784                 }
 785
 786                 $type = $element->getName();
 787                 $orig_type = $type;
 788
 789                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 790
 791                 // All retractions are handled identically from now on.
 792                 // In the new version there will only be "retraction".
 793                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 794                         $type = "retraction";
 795
 796                 if ($type == "request") {
 797                         $type = "contact";
 798                 }
 799
 800                 $fields = new SimpleXMLElement("<".$type."/>");
 801
 802                 $signed_data = "";
 803                 $author_signature = null;
 804                 $parent_author_signature = null;
 805
 806                 foreach ($element->children() as $fieldname => $entry) {
 807                         if ($oldXML) {
 808                                 // Translation for the old XML structure
 809                                 if ($fieldname == "diaspora_handle") {
 810                                         $fieldname = "author";
 811                                 }
 812                                 if ($fieldname == "participant_handles") {
 813                                         $fieldname = "participants";
 814                                 }
 815                                 if (in_array($type, ["like", "participation"])) {
 816                                         if ($fieldname == "target_type") {
 817                                                 $fieldname = "parent_type";
 818                                         }
 819                                 }
 820                                 if ($fieldname == "sender_handle") {
 821                                         $fieldname = "author";
 822                                 }
 823                                 if ($fieldname == "recipient_handle") {
 824                                         $fieldname = "recipient";
 825                                 }
 826                                 if ($fieldname == "root_diaspora_id") {
 827                                         $fieldname = "root_author";
 828                                 }
 829                                 if ($type == "status_message") {
 830                                         if ($fieldname == "raw_message") {
 831                                                 $fieldname = "text";
 832                                         }
 833                                 }
 834                                 if ($type == "retraction") {
 835                                         if ($fieldname == "post_guid") {
 836                                                 $fieldname = "target_guid";
 837                                         }
 838                                         if ($fieldname == "type") {
 839                                                 $fieldname = "target_type";
 840                                         }
 841                                 }
 842                         }
 843
 844                         if (($fieldname == "author_signature") && ($entry != "")) {
 845                                 $author_signature = base64_decode($entry);
 846                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 847                                 $parent_author_signature = base64_decode($entry);
 848                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 849                                 if ($signed_data != "") {
 850                                         $signed_data .= ";";
 851                                 }
 852
 853                                 $signed_data .= $entry;
 854                         }
 855                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 856                                 || ($orig_type == "relayable_retraction")
 857                         ) {
 858                                 XML::copy($entry, $fields, $fieldname);
 859                         }
 860                 }
 861
 862                 // This is something that shouldn't happen at all.
 863                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 864                         if ($msg["author"] != $fields->author) {
 865                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 866                                 return false;
 867                         }
 868                 }
 869
 870                 // Only some message types have signatures. So we quit here for the other types.
 871                 if (!in_array($type, ["comment", "like"])) {
 872                         return $fields;
 873                 }
 874                 // No author_signature? This is a must, so we quit.
 875                 if (!isset($author_signature)) {
 876                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 877                         return false;
 878                 }
 879
 880                 if (isset($parent_author_signature)) {
 881                         $key = self::key($msg["author"]);
 882                         if (empty($key)) {
 883                                 Logger::log("No key found for parent author ".$msg["author"], Logger::DEBUG);
 884                                 return false;
 885                         }
 886
 887                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 888                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 889                                 return false;
 890                         }
 891                 }
 892
 893                 $key = self::key($fields->author);
 894                 if (empty($key)) {
 895                         Logger::log("No key found for author ".$fields->author, Logger::DEBUG);
 896                         return false;
 897                 }
 898
 899                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 900                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 901                         return false;
 902                 } else {
 903                         return $fields;
 904                 }
 905         }
 906
 907         /**
 908          * @brief Fetches the public key for a given handle
 909          *
 910          * @param string $handle The handle
 911          *
 912          * @return string The public key
 913          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 914          * @throws \ImagickException
 915          */
 916         private static function key($handle)
 917         {
 918                 $handle = strval($handle);
 919
 920                 Logger::log("Fetching diaspora key for: ".$handle);
 921
 922                 $r = self::personByHandle($handle);
 923                 if ($r) {
 924                         return $r["pubkey"];
 925                 }
 926
 927                 return "";
 928         }
 929
 930         /**
 931          * @brief Fetches data for a given handle
 932          *
 933          * @param string $handle The handle
 934          *
 935          * @return array the queried data
 936          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 937          * @throws \ImagickException
 938          */
 939         public static function personByHandle($handle)
 940         {
 941                 $update = false;
 942
 943                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 944                 if (DBA::isResult($person)) {
 945                         Logger::debug("In cache " . print_r($person, true));
 946
 947                         // update record occasionally so it doesn't get stale
 948                         $d = strtotime($person["updated"]." +00:00");
 949                         if ($d < strtotime("now - 14 days")) {
 950                                 $update = true;
 951                         }
 952
 953                         if ($person["guid"] == "") {
 954                                 $update = true;
 955                         }
 956                 }
 957
 958                 if (!DBA::isResult($person) || $update) {
 959                         Logger::log("create or refresh", Logger::DEBUG);
 960                         $r = Probe::uri($handle, Protocol::DIASPORA);
 961
 962                         // Note that Friendica contacts will return a "Diaspora person"
 963                         // if Diaspora connectivity is enabled on their server
 964                         if ($r && ($r["network"] === Protocol::DIASPORA)) {
 965                                 self::updateFContact($r);
 966
 967                                 // Fetch the updated or added contact
 968                                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 969                                 if (!DBA::isResult($person)) {
 970                                         $person = $r;
 971                                         $person['id'] = 0;
 972                                 }
 973                         }
 974                 }
 975
 976                 return $person;
 977         }
 978
 979         /**
 980          * @brief Updates the fcontact table
 981          *
 982          * @param array $arr The fcontact data
 983          * @throws \Exception
 984          */
 985         private static function updateFContact($arr)
 986         {
 987                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
 988                         'request' => $arr["request"], 'nick' => $arr["nick"],
 989                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
 990                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
 991                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
 992                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
 993                         'updated' => DateTimeFormat::utcNow()];
 994
 995                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
 996
 997                 DBA::update('fcontact', $fields, $condition, true);
 998         }
 999
1000         /**
1001          * @brief get a handle (user@domain.tld) from a given contact id
1002          *
1003          * @param int $contact_id  The id in the contact table
1004          * @param int $pcontact_id The id in the contact table (Used for the public contact)
1005          *
1006          * @return string the handle
1007          * @throws \Exception
1008          */
1009         private static function handleFromContact($contact_id, $pcontact_id = 0)
1010         {
1011                 $handle = false;
1012
1013                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
1014
1015                 if ($pcontact_id != 0) {
1016                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
1017
1018                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
1019                                 return strtolower($contact["addr"]);
1020                         }
1021                 }
1022
1023                 $r = q(
1024                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1025                         intval($contact_id)
1026                 );
1027
1028                 if (DBA::isResult($r)) {
1029                         $contact = $r[0];
1030
1031                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
1032
1033                         if ($contact['addr'] != "") {
1034                                 $handle = $contact['addr'];
1035                         } else {
1036                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1037                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1038                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1039                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1040                                 $handle = $contact['nick'].'@'.$baseurl;
1041                         }
1042                 }
1043
1044                 return strtolower($handle);
1045         }
1046
1047         /**
1048          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1049          * fcontact guid
1050          *
1051          * @param mixed $fcontact_guid Hexadecimal string guid
1052          *
1053          * @return string the contact url or null
1054          * @throws \Exception
1055          */
1056         public static function urlFromContactGuid($fcontact_guid)
1057         {
1058                 Logger::log("fcontact guid is ".$fcontact_guid, Logger::DEBUG);
1059
1060                 $r = q(
1061                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1062                         DBA::escape(Protocol::DIASPORA),
1063                         DBA::escape($fcontact_guid)
1064                 );
1065
1066                 if (DBA::isResult($r)) {
1067                         return $r[0]['url'];
1068                 }
1069
1070                 return null;
1071         }
1072
1073         /**
1074          * @brief Get a contact id for a given handle
1075          *
1076          * @todo  Move to Friendica\Model\Contact
1077          *
1078          * @param int    $uid    The user id
1079          * @param string $handle The handle in the format user@domain.tld
1080          *
1081          * @return array Contact data
1082          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1083          * @throws \ImagickException
1084          */
1085         private static function contactByHandle($uid, $handle)
1086         {
1087                 $cid = Contact::getIdForURL($handle, $uid);
1088                 if (!$cid) {
1089                         $handle_parts = explode("@", $handle);
1090                         $nurl_sql = "%%://" . $handle_parts[1] . "%%/profile/" . $handle_parts[0];
1091                         $cid = Contact::getIdForURL($nurl_sql, $uid);
1092                 }
1093
1094                 if (!$cid) {
1095                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1096                         return false;
1097                 }
1098
1099                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1100                 if (!DBA::isResult($contact)) {
1101                         // This here shouldn't happen at all
1102                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1103                         return false;
1104                 }
1105
1106                 return $contact;
1107         }
1108
1109         /**
1110          * @brief Check if posting is allowed for this contact
1111          *
1112          * @param array $importer   Array of the importer user
1113          * @param array $contact    The contact that is checked
1114          * @param bool  $is_comment Is the check for a comment?
1115          *
1116          * @return bool is the contact allowed to post?
1117          */
1118         private static function postAllow(array $importer, array $contact, $is_comment = false)
1119         {
1120                 /*
1121                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1122                  * That makes us friends.
1123                  * Normally this should have handled by getting a request - but this could get lost
1124                  */
1125                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1126                 // It is not removed by now. Possibly the code is needed?
1127                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(User::PAGE_FLAGS_FREELOVE))) {
1128                 //      DBA::update(
1129                 //              'contact',
1130                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1131                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1132                 //      );
1133                 //
1134                 //      $contact["rel"] = Contact::FRIEND;
1135                 //      Logger::log("defining user ".$contact["nick"]." as friend");
1136                 //}
1137
1138                 // We don't seem to like that person
1139                 if ($contact["blocked"]) {
1140                         // Maybe blocked, don't accept.
1141                         return false;
1142                         // We are following this person?
1143                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1144                         // Yes, then it is fine.
1145                         return true;
1146                         // Is it a post to a community?
1147                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
1148                         // That's good
1149                         return true;
1150                         // Is the message a global user or a comment?
1151                 } elseif (($importer["uid"] == 0) || $is_comment) {
1152                         // Messages for the global users and comments are always accepted
1153                         return true;
1154                 }
1155
1156                 return false;
1157         }
1158
1159         /**
1160          * @brief Fetches the contact id for a handle and checks if posting is allowed
1161          *
1162          * @param array  $importer   Array of the importer user
1163          * @param string $handle     The checked handle in the format user@domain.tld
1164          * @param bool   $is_comment Is the check for a comment?
1165          *
1166          * @return array The contact data
1167          * @throws \Exception
1168          */
1169         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
1170         {
1171                 $contact = self::contactByHandle($importer["uid"], $handle);
1172                 if (!$contact) {
1173                         Logger::log("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1174                         // If a contact isn't found, we accept it anyway if it is a comment
1175                         if ($is_comment && ($importer["uid"] != 0)) {
1176                                 return self::contactByHandle(0, $handle);
1177                         } elseif ($is_comment) {
1178                                 return $importer;
1179                         } else {
1180                                 return false;
1181                         }
1182                 }
1183
1184                 if (!self::postAllow($importer, $contact, $is_comment)) {
1185                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1186                         return false;
1187                 }
1188                 return $contact;
1189         }
1190
1191         /**
1192          * @brief Does the message already exists on the system?
1193          *
1194          * @param int    $uid  The user id
1195          * @param string $guid The guid of the message
1196          *
1197          * @return int|bool message id if the message already was stored into the system - or false.
1198          * @throws \Exception
1199          */
1200         private static function messageExists($uid, $guid)
1201         {
1202                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1203                 if (DBA::isResult($item)) {
1204                         Logger::log("message ".$guid." already exists for user ".$uid);
1205                         return $item["id"];
1206                 }
1207
1208                 return false;
1209         }
1210
1211         /**
1212          * @brief Checks for links to posts in a message
1213          *
1214          * @param array $item The item array
1215          * @return void
1216          */
1217         private static function fetchGuid(array $item)
1218         {
1219                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1220                 preg_replace_callback(
1221                         $expression,
1222                         function ($match) use ($item) {
1223                                 self::fetchGuidSub($match, $item);
1224                         },
1225                         $item["body"]
1226                 );
1227
1228                 preg_replace_callback(
1229                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1230                         function ($match) use ($item) {
1231                                 self::fetchGuidSub($match, $item);
1232                         },
1233                         $item["body"]
1234                 );
1235         }
1236
1237         /**
1238          * @brief Checks for relative /people/* links in an item body to match local
1239          * contacts or prepends the remote host taken from the author link.
1240          *
1241          * @param string $body        The item body to replace links from
1242          * @param string $author_link The author link for missing local contact fallback
1243          *
1244          * @return string the replaced string
1245          */
1246         public static function replacePeopleGuid($body, $author_link)
1247         {
1248                 $return = preg_replace_callback(
1249                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1250                         function ($match) use ($author_link) {
1251                                 // $match
1252                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1253                                 // 1 => '0123456789abcdef'
1254                                 // 2 => 'Foo Bar'
1255                                 $handle = self::urlFromContactGuid($match[1]);
1256
1257                                 if ($handle) {
1258                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1259                                 } else {
1260                                         // No local match, restoring absolute remote URL from author scheme and host
1261                                         $author_url = parse_url($author_link);
1262                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1263                                 }
1264
1265                                 return $return;
1266                         },
1267                         $body
1268                 );
1269
1270                 return $return;
1271         }
1272
1273         /**
1274          * @brief sub function of "fetchGuid" which checks for links in messages
1275          *
1276          * @param array $match array containing a link that has to be checked for a message link
1277          * @param array $item  The item array
1278          * @return void
1279          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1280          * @throws \ImagickException
1281          */
1282         private static function fetchGuidSub($match, $item)
1283         {
1284                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1285                         self::storeByGuid($match[1], $item["owner-link"]);
1286                 }
1287         }
1288
1289         /**
1290          * @brief Fetches an item with a given guid from a given server
1291          *
1292          * @param string $guid   the message guid
1293          * @param string $server The server address
1294          * @param int    $uid    The user id of the user
1295          *
1296          * @return int the message id of the stored message or false
1297          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1298          * @throws \ImagickException
1299          */
1300         private static function storeByGuid($guid, $server, $uid = 0)
1301         {
1302                 $serverparts = parse_url($server);
1303
1304                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1305                         return false;
1306                 }
1307
1308                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1309
1310                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1311
1312                 $msg = self::message($guid, $server);
1313
1314                 if (!$msg) {
1315                         return false;
1316                 }
1317
1318                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1319
1320                 // Now call the dispatcher
1321                 return self::dispatchPublic($msg);
1322         }
1323
1324         /**
1325          * @brief Fetches a message from a server
1326          *
1327          * @param string $guid   message guid
1328          * @param string $server The url of the server
1329          * @param int    $level  Endless loop prevention
1330          *
1331          * @return array
1332          *      'message' => The message XML
1333          *      'author' => The author handle
1334          *      'key' => The public key of the author
1335          * @throws \Exception
1336          */
1337         private static function message($guid, $server, $level = 0)
1338         {
1339                 if ($level > 5) {
1340                         return false;
1341                 }
1342
1343                 // This will work for new Diaspora servers and Friendica servers from 3.5
1344                 $source_url = $server."/fetch/post/".urlencode($guid);
1345
1346                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1347
1348                 $envelope = Network::fetchUrl($source_url);
1349                 if ($envelope) {
1350                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1351                         $x = self::verifyMagicEnvelope($envelope);
1352                         if (!$x) {
1353                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1354                         } else {
1355                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1356                         }
1357                 } else {
1358                         $x = false;
1359                 }
1360
1361                 if (!$x) {
1362                         return false;
1363                 }
1364
1365                 $source_xml = XML::parseString($x);
1366
1367                 if (!is_object($source_xml)) {
1368                         return false;
1369                 }
1370
1371                 if ($source_xml->post->reshare) {
1372                         // Reshare of a reshare - old Diaspora version
1373                         Logger::log("Message is a reshare", Logger::DEBUG);
1374                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1375                 } elseif ($source_xml->getName() == "reshare") {
1376                         // Reshare of a reshare - new Diaspora version
1377                         Logger::log("Message is a new reshare", Logger::DEBUG);
1378                         return self::message($source_xml->root_guid, $server, ++$level);
1379                 }
1380
1381                 $author = "";
1382
1383                 // Fetch the author - for the old and the new Diaspora version
1384                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1385                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1386                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1387                         $author = (string)$source_xml->author;
1388                 }
1389
1390                 // If this isn't a "status_message" then quit
1391                 if (!$author) {
1392                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1393                         return false;
1394                 }
1395
1396                 $msg = ["message" => $x, "author" => $author];
1397
1398                 $msg["key"] = self::key($msg["author"]);
1399
1400                 return $msg;
1401         }
1402
1403         /**
1404          * @brief Fetches the item record of a given guid
1405          *
1406          * @param int    $uid     The user id
1407          * @param string $guid    message guid
1408          * @param string $author  The handle of the item
1409          * @param array  $contact The contact of the item owner
1410          *
1411          * @return array the item record
1412          * @throws \Exception
1413          */
1414         private static function parentItem($uid, $guid, $author, array $contact)
1415         {
1416                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1417                         'author-name', 'author-link', 'author-avatar',
1418                         'owner-name', 'owner-link', 'owner-avatar'];
1419                 $condition = ['uid' => $uid, 'guid' => $guid];
1420                 $item = Item::selectFirst($fields, $condition);
1421
1422                 if (!DBA::isResult($item)) {
1423                         $person = self::personByHandle($author);
1424                         $result = self::storeByGuid($guid, $person["url"], $uid);
1425
1426                         // We don't have an url for items that arrived at the public dispatcher
1427                         if (!$result && !empty($contact["url"])) {
1428                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1429                         }
1430
1431                         if ($result) {
1432                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1433
1434                                 $item = Item::selectFirst($fields, $condition);
1435                         }
1436                 }
1437
1438                 if (!DBA::isResult($item)) {
1439                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1440                         return false;
1441                 } else {
1442                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1443                         return $item;
1444                 }
1445         }
1446
1447         /**
1448          * @brief returns contact details
1449          *
1450          * @param array $def_contact The default contact if the person isn't found
1451          * @param array $person      The record of the person
1452          * @param int   $uid         The user id
1453          *
1454          * @return array
1455          *      'cid' => contact id
1456          *      'network' => network type
1457          * @throws \Exception
1458          */
1459         private static function authorContactByUrl($def_contact, $person, $uid)
1460         {
1461                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1462                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1463                 if (DBA::isResult($contact)) {
1464                         $cid = $contact["id"];
1465                         $network = $contact["network"];
1466                 } else {
1467                         $cid = $def_contact["id"];
1468                         $network = Protocol::DIASPORA;
1469                 }
1470
1471                 return ["cid" => $cid, "network" => $network];
1472         }
1473
1474         /**
1475          * @brief Is the profile a hubzilla profile?
1476          *
1477          * @param string $url The profile link
1478          *
1479          * @return bool is it a hubzilla server?
1480          */
1481         public static function isRedmatrix($url)
1482         {
1483                 return(strstr($url, "/channel/"));
1484         }
1485
1486         /**
1487          * @brief Generate a post link with a given handle and message guid
1488          *
1489          * @param string $addr        The user handle
1490          * @param string $guid        message guid
1491          * @param string $parent_guid optional parent guid
1492          *
1493          * @return string the post link
1494          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1495          * @throws \ImagickException
1496          */
1497         private static function plink($addr, $guid, $parent_guid = '')
1498         {
1499                 $contact = Contact::getDetailsByAddr($addr);
1500
1501                 // Fallback
1502                 if (!$contact) {
1503                         if ($parent_guid != '') {
1504                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1505                         } else {
1506                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1507                         }
1508                 }
1509
1510                 if ($contact["network"] == Protocol::DFRN) {
1511                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1512                 }
1513
1514                 if (self::isRedmatrix($contact["url"])) {
1515                         return $contact["url"] . "/?f=&mid=" . $guid;
1516                 }
1517
1518                 if ($parent_guid != '') {
1519                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1520                 } else {
1521                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1522                 }
1523         }
1524
1525         /**
1526          * @brief Receives account migration
1527          *
1528          * @param array  $importer Array of the importer user
1529          * @param object $data     The message object
1530          *
1531          * @return bool Success
1532          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1533          * @throws \ImagickException
1534          */
1535         private static function receiveAccountMigration(array $importer, $data)
1536         {
1537                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1538                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1539                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1540
1541                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1542                 if (!$contact) {
1543                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1544                         return false;
1545                 }
1546
1547                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1548
1549                 // Check signature
1550                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1551                 $key = self::key($old_handle);
1552                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1553                         Logger::log('No valid signature for migration.');
1554                         return false;
1555                 }
1556
1557                 // Update the profile
1558                 self::receiveProfile($importer, $data->profile);
1559
1560                 // change the technical stuff in contact and gcontact
1561                 $data = Probe::uri($new_handle);
1562                 if ($data['network'] == Protocol::PHANTOM) {
1563                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1564                         return false;
1565                 }
1566
1567                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1568                                 'name' => $data['name'], 'nick' => $data['nick'],
1569                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1570                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1571                                 'network' => $data['network']];
1572
1573                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1574
1575                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1576                                 'name' => $data['name'], 'nick' => $data['nick'],
1577                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1578                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1579                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1580
1581                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1582
1583                 Logger::log('Contacts are updated.');
1584
1585                 return true;
1586         }
1587
1588         /**
1589          * @brief Processes an account deletion
1590          *
1591          * @param object $data The message object
1592          *
1593          * @return bool Success
1594          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1595          */
1596         private static function receiveAccountDeletion($data)
1597         {
1598                 $author = Strings::escapeTags(XML::unescape($data->author));
1599
1600                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1601                 while ($contact = DBA::fetch($contacts)) {
1602                         Contact::remove($contact["id"]);
1603                 }
1604
1605                 DBA::delete('gcontact', ['addr' => $author]);
1606
1607                 Logger::log('Removed contacts for ' . $author);
1608
1609                 return true;
1610         }
1611
1612         /**
1613          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1614          *
1615          * @param string  $author    Author handle
1616          * @param string  $guid      Message guid
1617          * @param boolean $onlyfound Only return uri when found in the database
1618          *
1619          * @return string The constructed uri or the one from our database
1620          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1621          * @throws \ImagickException
1622          */
1623         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1624         {
1625                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1626                 if (DBA::isResult($item)) {
1627                         return $item["uri"];
1628                 } elseif (!$onlyfound) {
1629                         $person = self::personByHandle($author);
1630
1631                         $parts = parse_url($person['url']);
1632                         unset($parts['path']);
1633                         $host_url = Network::unparseURL($parts);
1634
1635                         return $host_url . '/objects/' . $guid;
1636                 }
1637
1638                 return "";
1639         }
1640
1641         /**
1642          * @brief Fetch the guid from our database with a given uri
1643          *
1644          * @param string $uri Message uri
1645          * @param string $uid Author handle
1646          *
1647          * @return string The post guid
1648          * @throws \Exception
1649          */
1650         private static function getGuidFromUri($uri, $uid)
1651         {
1652                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1653                 if (DBA::isResult($item)) {
1654                         return $item["guid"];
1655                 } else {
1656                         return false;
1657                 }
1658         }
1659
1660         /**
1661          * @brief Find the best importer for a comment, like, ...
1662          *
1663          * @param string $guid The guid of the item
1664          *
1665          * @return array|boolean the origin owner of that post - or false
1666          * @throws \Exception
1667          */
1668         private static function importerForGuid($guid)
1669         {
1670                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1671                 if (DBA::isResult($item)) {
1672                         Logger::log("Found user ".$item['uid']." as owner of item ".$guid, Logger::DEBUG);
1673                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1674                         if (DBA::isResult($contact)) {
1675                                 return $contact;
1676                         }
1677                 }
1678                 return false;
1679         }
1680
1681         /**
1682          * @brief Processes an incoming comment
1683          *
1684          * @param array  $importer Array of the importer user
1685          * @param string $sender   The sender of the message
1686          * @param object $data     The message object
1687          * @param string $xml      The original XML of the message
1688          *
1689          * @return int The message id of the generated comment or "false" if there was an error
1690          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1691          * @throws \ImagickException
1692          */
1693         private static function receiveComment(array $importer, $sender, $data, $xml)
1694         {
1695                 $author = Strings::escapeTags(XML::unescape($data->author));
1696                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1697                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1698                 $text = XML::unescape($data->text);
1699
1700                 if (isset($data->created_at)) {
1701                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1702                 } else {
1703                         $created_at = DateTimeFormat::utcNow();
1704                 }
1705
1706                 if (isset($data->thread_parent_guid)) {
1707                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1708                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1709                 } else {
1710                         $thr_uri = "";
1711                 }
1712
1713                 $contact = self::allowedContactByHandle($importer, $sender, true);
1714                 if (!$contact) {
1715                         return false;
1716                 }
1717
1718                 $message_id = self::messageExists($importer["uid"], $guid);
1719                 if ($message_id) {
1720                         return true;
1721                 }
1722
1723                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1724                 if (!$parent_item) {
1725                         return false;
1726                 }
1727
1728                 $person = self::personByHandle($author);
1729                 if (!is_array($person)) {
1730                         Logger::log("unable to find author details");
1731                         return false;
1732                 }
1733
1734                 // Fetch the contact id - if we know this contact
1735                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1736
1737                 $datarray = [];
1738
1739                 $datarray["uid"] = $importer["uid"];
1740                 $datarray["contact-id"] = $author_contact["cid"];
1741                 $datarray["network"]  = $author_contact["network"];
1742
1743                 $datarray["author-link"] = $person["url"];
1744                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1745
1746                 $datarray["owner-link"] = $contact["url"];
1747                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1748
1749                 $datarray["guid"] = $guid;
1750                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1751
1752                 $datarray["verb"] = ACTIVITY_POST;
1753                 $datarray["gravity"] = GRAVITY_COMMENT;
1754
1755                 if ($thr_uri != "") {
1756                         $datarray["parent-uri"] = $thr_uri;
1757                 } else {
1758                         $datarray["parent-uri"] = $parent_item["uri"];
1759                 }
1760
1761                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1762
1763                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1764                 $datarray["source"] = $xml;
1765
1766                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1767
1768                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1769
1770                 $body = Markdown::toBBCode($text);
1771
1772                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1773
1774                 self::fetchGuid($datarray);
1775
1776                 // If we are the origin of the parent we store the original data.
1777                 // We notify our followers during the item storage.
1778                 if ($parent_item["origin"]) {
1779                         $datarray['diaspora_signed_text'] = json_encode($data);
1780                 }
1781
1782                 $message_id = Item::insert($datarray);
1783
1784                 if ($message_id <= 0) {
1785                         return false;
1786                 }
1787
1788                 if ($message_id) {
1789                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1790                         if ($datarray['uid'] == 0) {
1791                                 Item::distribute($message_id, json_encode($data));
1792                         }
1793                 }
1794
1795                 return true;
1796         }
1797
1798         /**
1799          * @brief processes and stores private messages
1800          *
1801          * @param array  $importer     Array of the importer user
1802          * @param array  $contact      The contact of the message
1803          * @param object $data         The message object
1804          * @param array  $msg          Array of the processed message, author handle and key
1805          * @param object $mesg         The private message
1806          * @param array  $conversation The conversation record to which this message belongs
1807          *
1808          * @return bool "true" if it was successful
1809          * @throws \Exception
1810          */
1811         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1812         {
1813                 $author = Strings::escapeTags(XML::unescape($data->author));
1814                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1815                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1816
1817                 // "diaspora_handle" is the element name from the old version
1818                 // "author" is the element name from the new version
1819                 if ($mesg->author) {
1820                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1821                 } elseif ($mesg->diaspora_handle) {
1822                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1823                 } else {
1824                         return false;
1825                 }
1826
1827                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1828                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1829                 $msg_text = XML::unescape($mesg->text);
1830                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1831
1832                 if ($msg_conversation_guid != $guid) {
1833                         Logger::log("message conversation guid does not belong to the current conversation.");
1834                         return false;
1835                 }
1836
1837                 $body = Markdown::toBBCode($msg_text);
1838                 $message_uri = $msg_author.":".$msg_guid;
1839
1840                 $person = self::personByHandle($msg_author);
1841
1842                 DBA::lock('mail');
1843
1844                 if (DBA::exists('mail', ['guid' => $msg_guid, 'uid' => $importer["uid"]])) {
1845                         Logger::log("duplicate message already delivered.", Logger::DEBUG);
1846                         return false;
1847                 }
1848
1849                 DBA::insert('mail', [
1850                         'uid'        => $importer['uid'],
1851                         'guid'       => $msg_guid,
1852                         'convid'     => $conversation['id'],
1853                         'from-name'  => $person['name'],
1854                         'from-photo' => $person['photo'],
1855                         'from-url'   => $person['url'],
1856                         'contact-id' => $contact['id'],
1857                         'title'      => $subject,
1858                         'body'       => $body,
1859                         'seen'       => 0,
1860                         'reply'      => 0,
1861                         'uri'        => $message_uri,
1862                         'parent-uri' => $author . ':' . $guid,
1863                         'created'    => $msg_created_at
1864                 ]);
1865
1866                 $message_id = DBA::lastInsertId();
1867
1868                 DBA::unlock();
1869
1870                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
1871
1872                 notification([
1873                         "type" => NOTIFY_MAIL,
1874                         "notify_flags" => $importer["notify-flags"],
1875                         "language" => $importer["language"],
1876                         "to_name" => $importer["username"],
1877                         "to_email" => $importer["email"],
1878                         "uid" => $importer["uid"],
1879                         "item" => ["id" => $message_id, "title" => $subject, "subject" => $subject, "body" => $body],
1880                         "parent" => $conversation["id"],
1881                         "source_name" => $person["name"],
1882                         "source_link" => $person["url"],
1883                         "source_photo" => $person["photo"],
1884                         "verb" => ACTIVITY_POST,
1885                         "otype" => "mail"
1886                 ]);
1887
1888                 return true;
1889         }
1890
1891         /**
1892          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1893          *
1894          * @param array  $importer Array of the importer user
1895          * @param array  $msg      Array of the processed message, author handle and key
1896          * @param object $data     The message object
1897          *
1898          * @return bool Success
1899          * @throws \Exception
1900          */
1901         private static function receiveConversation(array $importer, $msg, $data)
1902         {
1903                 $author = Strings::escapeTags(XML::unescape($data->author));
1904                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1905                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1906                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1907                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1908
1909                 $messages = $data->message;
1910
1911                 if (!count($messages)) {
1912                         Logger::log("empty conversation");
1913                         return false;
1914                 }
1915
1916                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1917                 if (!$contact) {
1918                         return false;
1919                 }
1920
1921                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1922                 if (!DBA::isResult($conversation)) {
1923                         $r = q(
1924                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1925                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1926                                 intval($importer["uid"]),
1927                                 DBA::escape($guid),
1928                                 DBA::escape($author),
1929                                 DBA::escape($created_at),
1930                                 DBA::escape(DateTimeFormat::utcNow()),
1931                                 DBA::escape($subject),
1932                                 DBA::escape($participants)
1933                         );
1934                         if ($r) {
1935                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1936                         }
1937                 }
1938                 if (!$conversation) {
1939                         Logger::log("unable to create conversation.");
1940                         return false;
1941                 }
1942
1943                 foreach ($messages as $mesg) {
1944                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1945                 }
1946
1947                 return true;
1948         }
1949
1950         /**
1951          * @brief Processes "like" messages
1952          *
1953          * @param array  $importer Array of the importer user
1954          * @param string $sender   The sender of the message
1955          * @param object $data     The message object
1956          *
1957          * @return int The message id of the generated like or "false" if there was an error
1958          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1959          * @throws \ImagickException
1960          */
1961         private static function receiveLike(array $importer, $sender, $data)
1962         {
1963                 $author = Strings::escapeTags(XML::unescape($data->author));
1964                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1965                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1966                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
1967                 $positive = Strings::escapeTags(XML::unescape($data->positive));
1968
1969                 // likes on comments aren't supported by Diaspora - only on posts
1970                 // But maybe this will be supported in the future, so we will accept it.
1971                 if (!in_array($parent_type, ["Post", "Comment"])) {
1972                         return false;
1973                 }
1974
1975                 $contact = self::allowedContactByHandle($importer, $sender, true);
1976                 if (!$contact) {
1977                         return false;
1978                 }
1979
1980                 $message_id = self::messageExists($importer["uid"], $guid);
1981                 if ($message_id) {
1982                         return true;
1983                 }
1984
1985                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1986                 if (!$parent_item) {
1987                         return false;
1988                 }
1989
1990                 $person = self::personByHandle($author);
1991                 if (!is_array($person)) {
1992                         Logger::log("unable to find author details");
1993                         return false;
1994                 }
1995
1996                 // Fetch the contact id - if we know this contact
1997                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1998
1999                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2000                 // We would accept this anyhow.
2001                 if ($positive == "true") {
2002                         $verb = ACTIVITY_LIKE;
2003                 } else {
2004                         $verb = ACTIVITY_DISLIKE;
2005                 }
2006
2007                 $datarray = [];
2008
2009                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2010
2011                 $datarray["uid"] = $importer["uid"];
2012                 $datarray["contact-id"] = $author_contact["cid"];
2013                 $datarray["network"]  = $author_contact["network"];
2014
2015                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
2016                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
2017
2018                 $datarray["guid"] = $guid;
2019                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2020
2021                 $datarray["verb"] = $verb;
2022                 $datarray["gravity"] = GRAVITY_ACTIVITY;
2023                 $datarray["parent-uri"] = $parent_item["uri"];
2024
2025                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2026
2027                 $datarray["body"] = $verb;
2028
2029                 // Diaspora doesn't provide a date for likes
2030                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
2031
2032                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2033                 if ($parent_item["id"] != $parent_item["parent"]) {
2034                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item["parent"]]);
2035                         $origin = $toplevel["origin"];
2036                 } else {
2037                         $origin = $parent_item["origin"];
2038                 }
2039
2040                 // If we are the origin of the parent we store the original data.
2041                 // We notify our followers during the item storage.
2042                 if ($origin) {
2043                         $datarray['diaspora_signed_text'] = json_encode($data);
2044                 }
2045
2046                 $message_id = Item::insert($datarray);
2047
2048                 if ($message_id <= 0) {
2049                         return false;
2050                 }
2051
2052                 if ($message_id) {
2053                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2054                         if ($datarray['uid'] == 0) {
2055                                 Item::distribute($message_id, json_encode($data));
2056                         }
2057                 }
2058
2059                 return true;
2060         }
2061
2062         /**
2063          * @brief Processes private messages
2064          *
2065          * @param array  $importer Array of the importer user
2066          * @param object $data     The message object
2067          *
2068          * @return bool Success?
2069          * @throws \Exception
2070          */
2071         private static function receiveMessage(array $importer, $data)
2072         {
2073                 $author = Strings::escapeTags(XML::unescape($data->author));
2074                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2075                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
2076                 $text = XML::unescape($data->text);
2077                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2078
2079                 $contact = self::allowedContactByHandle($importer, $author, true);
2080                 if (!$contact) {
2081                         return false;
2082                 }
2083
2084                 $conversation = null;
2085
2086                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
2087                 $conversation = DBA::selectFirst('conv', [], $condition);
2088
2089                 if (!DBA::isResult($conversation)) {
2090                         Logger::log("conversation not available.");
2091                         return false;
2092                 }
2093
2094                 $message_uri = $author.":".$guid;
2095
2096                 $person = self::personByHandle($author);
2097                 if (!$person) {
2098                         Logger::log("unable to find author details");
2099                         return false;
2100                 }
2101
2102                 $body = Markdown::toBBCode($text);
2103
2104                 $body = self::replacePeopleGuid($body, $person["url"]);
2105
2106                 DBA::lock('mail');
2107
2108                 if (DBA::exists('mail', ['guid' => $guid, 'uid' => $importer["uid"]])) {
2109                         Logger::log("duplicate message already delivered.", Logger::DEBUG);
2110                         return false;
2111                 }
2112
2113                 DBA::insert('mail', [
2114                         'uid'        => $importer['uid'],
2115                         'guid'       => $guid,
2116                         'convid'     => $conversation['id'],
2117                         'from-name'  => $person['name'],
2118                         'from-photo' => $person['photo'],
2119                         'from-url'   => $person['url'],
2120                         'contact-id' => $contact['id'],
2121                         'title'      => $conversation['subject'],
2122                         'body'       => $body,
2123                         'seen'       => 0,
2124                         'reply'      => 1,
2125                         'uri'        => $message_uri,
2126                         'parent-uri' => $author.":".$conversation['guid'],
2127                         'created'    => $created_at
2128                 ]);
2129
2130                 $message_id = DBA::lastInsertId();
2131
2132                 DBA::unlock();
2133
2134                 DBA::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
2135
2136                 notification([
2137                         "type" => NOTIFY_MAIL,
2138                         "notify_flags" => $importer["notify-flags"],
2139                         "language" => $importer["language"],
2140                         "to_name" => $importer["username"],
2141                         "to_email" => $importer["email"],
2142                         "uid" => $importer["uid"],
2143                         "item" => ["id" => $message_id, "title" => $conversation["subject"], "subject" => $conversation["subject"], "body" => $body],
2144                         "parent" => $conversation["id"],
2145                         "source_name" => $person["name"],
2146                         "source_link" => $person["url"],
2147                         "source_photo" => $person["photo"],
2148                         "verb" => ACTIVITY_POST,
2149                         "otype" => "mail"
2150                 ]);
2151
2152                 return true;
2153         }
2154
2155         /**
2156          * @brief Processes participations - unsupported by now
2157          *
2158          * @param array  $importer Array of the importer user
2159          * @param object $data     The message object
2160          *
2161          * @return bool always true
2162          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2163          * @throws \ImagickException
2164          */
2165         private static function receiveParticipation(array $importer, $data)
2166         {
2167                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2168                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2169
2170                 $contact_id = Contact::getIdForURL($author);
2171                 if (!$contact_id) {
2172                         Logger::log('Contact not found: '.$author);
2173                         return false;
2174                 }
2175
2176                 $person = self::personByHandle($author);
2177                 if (!is_array($person)) {
2178                         Logger::log("Person not found: ".$author);
2179                         return false;
2180                 }
2181
2182                 $item = Item::selectFirst(['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2183                 if (!DBA::isResult($item)) {
2184                         Logger::log('Item not found, no origin or private: '.$parent_guid);
2185                         return false;
2186                 }
2187
2188                 $author_parts = explode('@', $author);
2189                 if (isset($author_parts[1])) {
2190                         $server = $author_parts[1];
2191                 } else {
2192                         // Should never happen
2193                         $server = $author;
2194                 }
2195
2196                 Logger::log('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, Logger::DEBUG);
2197
2198                 if (!DBA::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2199                         DBA::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2200                 }
2201
2202                 // Send all existing comments and likes to the requesting server
2203                 $comments = Item::select(['id', 'parent', 'verb', 'self'], ['parent' => $item['id']]);
2204                 while ($comment = Item::fetch($comments)) {
2205                         if ($comment['id'] == $comment['parent']) {
2206                                 continue;
2207                         }
2208                         if ($comment['verb'] == ACTIVITY_POST) {
2209                                 $cmd = $comment['self'] ? 'comment-new' : 'comment-import';
2210                         } else {
2211                                 $cmd = $comment['self'] ? 'like' : 'comment-import';
2212                         }
2213                         Logger::log("Send ".$cmd." for item ".$comment['id']." to contact ".$contact_id, Logger::DEBUG);
2214                         Worker::add(PRIORITY_HIGH, 'Delivery', $cmd, $comment['id'], $contact_id);
2215                 }
2216                 DBA::close($comments);
2217
2218                 return true;
2219         }
2220
2221         /**
2222          * @brief Processes photos - unneeded
2223          *
2224          * @param array  $importer Array of the importer user
2225          * @param object $data     The message object
2226          *
2227          * @return bool always true
2228          */
2229         private static function receivePhoto(array $importer, $data)
2230         {
2231                 // There doesn't seem to be a reason for this function,
2232                 // since the photo data is transmitted in the status message as well
2233                 return true;
2234         }
2235
2236         /**
2237          * @brief Processes poll participations - unssupported
2238          *
2239          * @param array  $importer Array of the importer user
2240          * @param object $data     The message object
2241          *
2242          * @return bool always true
2243          */
2244         private static function receivePollParticipation(array $importer, $data)
2245         {
2246                 // We don't support polls by now
2247                 return true;
2248         }
2249
2250         /**
2251          * @brief Processes incoming profile updates
2252          *
2253          * @param array  $importer Array of the importer user
2254          * @param object $data     The message object
2255          *
2256          * @return bool Success
2257          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2258          * @throws \ImagickException
2259          */
2260         private static function receiveProfile(array $importer, $data)
2261         {
2262                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2263
2264                 $contact = self::contactByHandle($importer["uid"], $author);
2265                 if (!$contact) {
2266                         return false;
2267                 }
2268
2269                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2270                 $image_url = XML::unescape($data->image_url);
2271                 $birthday = XML::unescape($data->birthday);
2272                 $gender = XML::unescape($data->gender);
2273                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2274                 $location = Markdown::toBBCode(XML::unescape($data->location));
2275                 $searchable = (XML::unescape($data->searchable) == "true");
2276                 $nsfw = (XML::unescape($data->nsfw) == "true");
2277                 $tags = XML::unescape($data->tag_string);
2278
2279                 $tags = explode("#", $tags);
2280
2281                 $keywords = [];
2282                 foreach ($tags as $tag) {
2283                         $tag = trim(strtolower($tag));
2284                         if ($tag != "") {
2285                                 $keywords[] = $tag;
2286                         }
2287                 }
2288
2289                 $keywords = implode(", ", $keywords);
2290
2291                 $handle_parts = explode("@", $author);
2292                 $nick = $handle_parts[0];
2293
2294                 if ($name === "") {
2295                         $name = $handle_parts[0];
2296                 }
2297
2298                 if (preg_match("|^https?://|", $image_url) === 0) {
2299                         $image_url = "http://".$handle_parts[1].$image_url;
2300                 }
2301
2302                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2303
2304                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2305
2306                 $birthday = str_replace("1000", "1901", $birthday);
2307
2308                 if ($birthday != "") {
2309                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2310                 }
2311
2312                 // this is to prevent multiple birthday notifications in a single year
2313                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2314
2315                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2316                         $birthday = $contact["bd"];
2317                 }
2318
2319                 $fields = ['name' => $name, 'location' => $location,
2320                         'name-date' => DateTimeFormat::utcNow(),
2321                         'about' => $about, 'gender' => $gender,
2322                         'addr' => $author, 'nick' => $nick,
2323                         'keywords' => $keywords];
2324
2325                 if (!empty($birthday)) {
2326                         $fields['bd'] = $birthday;
2327                 }
2328
2329                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2330
2331                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2332                                         "photo" => $image_url, "name" => $name, "location" => $location,
2333                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2334                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2335                                         "hide" => !$searchable, "nsfw" => $nsfw];
2336
2337                 $gcid = GContact::update($gcontact);
2338
2339                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2340
2341                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2342
2343                 return true;
2344         }
2345
2346         /**
2347          * @brief Processes incoming friend requests
2348          *
2349          * @param array $importer Array of the importer user
2350          * @param array $contact  The contact that send the request
2351          * @return void
2352          * @throws \Exception
2353          */
2354         private static function receiveRequestMakeFriend(array $importer, array $contact)
2355         {
2356                 if ($contact["rel"] == Contact::SHARING) {
2357                         DBA::update(
2358                                 'contact',
2359                                 ['rel' => Contact::FRIEND, 'writable' => true],
2360                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2361                         );
2362                 }
2363         }
2364
2365         /**
2366          * @brief Processes incoming sharing notification
2367          *
2368          * @param array  $importer Array of the importer user
2369          * @param object $data     The message object
2370          *
2371          * @return bool Success
2372          * @throws \Exception
2373          */
2374         private static function receiveContactRequest(array $importer, $data)
2375         {
2376                 $author = XML::unescape($data->author);
2377                 $recipient = XML::unescape($data->recipient);
2378
2379                 if (!$author || !$recipient) {
2380                         return false;
2381                 }
2382
2383                 // the current protocol version doesn't know these fields
2384                 // That means that we will assume their existance
2385                 if (isset($data->following)) {
2386                         $following = (XML::unescape($data->following) == "true");
2387                 } else {
2388                         $following = true;
2389                 }
2390
2391                 if (isset($data->sharing)) {
2392                         $sharing = (XML::unescape($data->sharing) == "true");
2393                 } else {
2394                         $sharing = true;
2395                 }
2396
2397                 $contact = self::contactByHandle($importer["uid"], $author);
2398
2399                 // perhaps we were already sharing with this person. Now they're sharing with us.
2400                 // That makes us friends.
2401                 if ($contact) {
2402                         if ($following) {
2403                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2404                                 self::receiveRequestMakeFriend($importer, $contact);
2405
2406                                 // refetch the contact array
2407                                 $contact = self::contactByHandle($importer["uid"], $author);
2408
2409                                 // If we are now friends, we are sending a share message.
2410                                 // Normally we needn't to do so, but the first message could have been vanished.
2411                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2412                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2413                                         if (DBA::isResult($user)) {
2414                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2415                                                 self::sendShare($user, $contact);
2416                                         }
2417                                 }
2418                                 return true;
2419                         } else {
2420                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2421                                 Contact::removeFollower($importer, $contact);
2422                                 return true;
2423                         }
2424                 }
2425
2426                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2427                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2428                         return false;
2429                 } elseif (!$following && !$sharing) {
2430                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2431                         return false;
2432                 } elseif (!$following && $sharing) {
2433                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2434                 } elseif ($following && $sharing) {
2435                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2436                 } elseif ($following && !$sharing) {
2437                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2438                 }
2439
2440                 $ret = self::personByHandle($author);
2441
2442                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2443                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2444                         return false;
2445                 }
2446
2447                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2448
2449                 q(
2450                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2451                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2452                         intval($importer["uid"]),
2453                         DBA::escape($ret["network"]),
2454                         DBA::escape($ret["addr"]),
2455                         DateTimeFormat::utcNow(),
2456                         DBA::escape($ret["url"]),
2457                         DBA::escape(Strings::normaliseLink($ret["url"])),
2458                         DBA::escape($batch),
2459                         DBA::escape($ret["name"]),
2460                         DBA::escape($ret["nick"]),
2461                         DBA::escape($ret["photo"]),
2462                         DBA::escape($ret["pubkey"]),
2463                         DBA::escape($ret["notify"]),
2464                         DBA::escape($ret["poll"]),
2465                         1,
2466                         2
2467                 );
2468
2469                 // find the contact record we just created
2470
2471                 $contact_record = self::contactByHandle($importer["uid"], $author);
2472
2473                 if (!$contact_record) {
2474                         Logger::log("unable to locate newly created contact record.");
2475                         return;
2476                 }
2477
2478                 Logger::log("Author ".$author." was added as contact number ".$contact_record["id"].".", Logger::DEBUG);
2479
2480                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2481
2482                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2483
2484                 if (in_array($importer["page-flags"], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP])) {
2485                         Logger::log("Sending intra message for author ".$author.".", Logger::DEBUG);
2486
2487                         $hash = Strings::getRandomHex().(string)time();   // Generate a confirm_key
2488
2489                         q(
2490                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2491                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2492                                 intval($importer["uid"]),
2493                                 intval($contact_record["id"]),
2494                                 0,
2495                                 0,
2496                                 DBA::escape(L10n::t("Sharing notification from Diaspora network")),
2497                                 DBA::escape($hash),
2498                                 DBA::escape(DateTimeFormat::utcNow())
2499                         );
2500                 } else {
2501                         // automatic friend approval
2502
2503                         Logger::log("Does an automatic friend approval for author ".$author.".", Logger::DEBUG);
2504
2505                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2506
2507                         /*
2508                          * technically they are sharing with us (Contact::SHARING),
2509                          * but if our page-type is Profile::PAGE_COMMUNITY or Profile::PAGE_SOAPBOX
2510                          * we are going to change the relationship and make them a follower.
2511                          */
2512                         if (($importer["page-flags"] == User::PAGE_FLAGS_FREELOVE) && $sharing && $following) {
2513                                 $new_relation = Contact::FRIEND;
2514                         } elseif (($importer["page-flags"] == User::PAGE_FLAGS_FREELOVE) && $sharing) {
2515                                 $new_relation = Contact::SHARING;
2516                         } else {
2517                                 $new_relation = Contact::FOLLOWER;
2518                         }
2519
2520                         q(
2521                                 "UPDATE `contact` SET `rel` = %d,
2522                                 `name-date` = '%s',
2523                                 `uri-date` = '%s',
2524                                 `blocked` = 0,
2525                                 `pending` = 0,
2526                                 `writable` = 1
2527                                 WHERE `id` = %d
2528                                 ",
2529                                 intval($new_relation),
2530                                 DBA::escape(DateTimeFormat::utcNow()),
2531                                 DBA::escape(DateTimeFormat::utcNow()),
2532                                 intval($contact_record["id"])
2533                         );
2534
2535                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2536                         if (DBA::isResult($user)) {
2537                                 Logger::log("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2538                                 self::sendShare($user, $contact_record);
2539
2540                                 // Send the profile data, maybe it weren't transmitted before
2541                                 self::sendProfile($importer["uid"], [$contact_record]);
2542                         }
2543                 }
2544
2545                 return true;
2546         }
2547
2548         /**
2549          * @brief Fetches a message with a given guid
2550          *
2551          * @param string $guid        message guid
2552          * @param string $orig_author handle of the original post
2553          * @return array The fetched item
2554          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2555          * @throws \ImagickException
2556          */
2557         public static function originalItem($guid, $orig_author)
2558         {
2559                 if (empty($guid)) {
2560                         Logger::log('Empty guid. Quitting.');
2561                         return false;
2562                 }
2563
2564                 // Do we already have this item?
2565                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2566                         'author-name', 'author-link', 'author-avatar'];
2567                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2568                 $item = Item::selectFirst($fields, $condition);
2569
2570                 if (DBA::isResult($item)) {
2571                         Logger::log("reshared message ".$guid." already exists on system.");
2572
2573                         // Maybe it is already a reshared item?
2574                         // Then refetch the content, if it is a reshare from a reshare.
2575                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2576                         if (self::isReshare($item["body"], true)) {
2577                                 $item = [];
2578                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2579                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2580
2581                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2582
2583                                 // Add OEmbed and other information to the body
2584                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2585
2586                                 return $item;
2587                         } else {
2588                                 return $item;
2589                         }
2590                 }
2591
2592                 if (!DBA::isResult($item)) {
2593                         if (empty($orig_author)) {
2594                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2595                                 return false;
2596                         }
2597
2598                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2599                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2600                         $stored = self::storeByGuid($guid, $server);
2601
2602                         if (!$stored) {
2603                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2604                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2605                                 $stored = self::storeByGuid($guid, $server);
2606                         }
2607
2608                         if ($stored) {
2609                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2610                                         'author-name', 'author-link', 'author-avatar'];
2611                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2612                                 $item = Item::selectFirst($fields, $condition);
2613
2614                                 if (DBA::isResult($item)) {
2615                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2616                                         if (self::isReshare($item["body"], false)) {
2617                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2618                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2619                                         }
2620
2621                                         return $item;
2622                                 }
2623                         }
2624                 }
2625                 return false;
2626         }
2627
2628         /**
2629          * @brief Processes a reshare message
2630          *
2631          * @param array  $importer Array of the importer user
2632          * @param object $data     The message object
2633          * @param string $xml      The original XML of the message
2634          *
2635          * @return int the message id
2636          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2637          * @throws \ImagickException
2638          */
2639         private static function receiveReshare(array $importer, $data, $xml)
2640         {
2641                 $author = Strings::escapeTags(XML::unescape($data->author));
2642                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2643                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2644                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2645                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2646                 /// @todo handle unprocessed property "provider_display_name"
2647                 $public = Strings::escapeTags(XML::unescape($data->public));
2648
2649                 $contact = self::allowedContactByHandle($importer, $author, false);
2650                 if (!$contact) {
2651                         return false;
2652                 }
2653
2654                 $message_id = self::messageExists($importer["uid"], $guid);
2655                 if ($message_id) {
2656                         return true;
2657                 }
2658
2659                 $original_item = self::originalItem($root_guid, $root_author);
2660                 if (!$original_item) {
2661                         return false;
2662                 }
2663
2664                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2665
2666                 $datarray = [];
2667
2668                 $datarray["uid"] = $importer["uid"];
2669                 $datarray["contact-id"] = $contact["id"];
2670                 $datarray["network"]  = Protocol::DIASPORA;
2671
2672                 $datarray["author-link"] = $contact["url"];
2673                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2674
2675                 $datarray["owner-link"] = $datarray["author-link"];
2676                 $datarray["owner-id"] = $datarray["author-id"];
2677
2678                 $datarray["guid"] = $guid;
2679                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2680
2681                 $datarray["verb"] = ACTIVITY_POST;
2682                 $datarray["gravity"] = GRAVITY_PARENT;
2683
2684                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2685                 $datarray["source"] = $xml;
2686
2687                 $prefix = share_header(
2688                         $original_item["author-name"],
2689                         $original_item["author-link"],
2690                         $original_item["author-avatar"],
2691                         $original_item["guid"],
2692                         $original_item["created"],
2693                         $orig_url
2694                 );
2695                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2696
2697                 $datarray["tag"] = $original_item["tag"];
2698                 $datarray["app"]  = $original_item["app"];
2699
2700                 $datarray["plink"] = self::plink($author, $guid);
2701                 $datarray["private"] = (($public == "false") ? 1 : 0);
2702                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2703
2704                 $datarray["object-type"] = $original_item["object-type"];
2705
2706                 self::fetchGuid($datarray);
2707                 $message_id = Item::insert($datarray);
2708
2709                 self::sendParticipation($contact, $datarray);
2710
2711                 if ($message_id) {
2712                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2713                         if ($datarray['uid'] == 0) {
2714                                 Item::distribute($message_id);
2715                         }
2716                         return true;
2717                 } else {
2718                         return false;
2719                 }
2720         }
2721
2722         /**
2723          * @brief Processes retractions
2724          *
2725          * @param array  $importer Array of the importer user
2726          * @param array  $contact  The contact of the item owner
2727          * @param object $data     The message object
2728          *
2729          * @return bool success
2730          * @throws \Exception
2731          */
2732         private static function itemRetraction(array $importer, array $contact, $data)
2733         {
2734                 $author = Strings::escapeTags(XML::unescape($data->author));
2735                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2736                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2737
2738                 $person = self::personByHandle($author);
2739                 if (!is_array($person)) {
2740                         Logger::log("unable to find author detail for ".$author);
2741                         return false;
2742                 }
2743
2744                 if (empty($contact["url"])) {
2745                         $contact["url"] = $person["url"];
2746                 }
2747
2748                 // Fetch items that are about to be deleted
2749                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2750
2751                 // When we receive a public retraction, we delete every item that we find.
2752                 if ($importer['uid'] == 0) {
2753                         $condition = ['guid' => $target_guid, 'deleted' => false];
2754                 } else {
2755                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2756                 }
2757
2758                 $r = Item::select($fields, $condition);
2759                 if (!DBA::isResult($r)) {
2760                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2761                         return false;
2762                 }
2763
2764                 while ($item = Item::fetch($r)) {
2765                         if (strstr($item['file'], '[')) {
2766                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2767                                 continue;
2768                         }
2769
2770                         // Fetch the parent item
2771                         $parent = Item::selectFirst(['author-link'], ['id' => $item["parent"]]);
2772
2773                         // Only delete it if the parent author really fits
2774                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2775                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2776                                 continue;
2777                         }
2778
2779                         Item::delete(['id' => $item['id']]);
2780
2781                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], Logger::DEBUG);
2782                 }
2783
2784                 return true;
2785         }
2786
2787         /**
2788          * @brief Receives retraction messages
2789          *
2790          * @param array  $importer Array of the importer user
2791          * @param string $sender   The sender of the message
2792          * @param object $data     The message object
2793          *
2794          * @return bool Success
2795          * @throws \Exception
2796          */
2797         private static function receiveRetraction(array $importer, $sender, $data)
2798         {
2799                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2800
2801                 $contact = self::contactByHandle($importer["uid"], $sender);
2802                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2803                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2804                         return false;
2805                 }
2806
2807                 if (!$contact) {
2808                         $contact = [];
2809                 }
2810
2811                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2812
2813                 switch ($target_type) {
2814                         case "Comment":
2815                         case "Like":
2816                         case "Post":
2817                         case "Reshare":
2818                         case "StatusMessage":
2819                                 return self::itemRetraction($importer, $contact, $data);
2820
2821                         case "PollParticipation":
2822                         case "Photo":
2823                                 // Currently unsupported
2824                                 break;
2825
2826                         default:
2827                                 Logger::log("Unknown target type ".$target_type);
2828                                 return false;
2829                 }
2830                 return true;
2831         }
2832
2833         /**
2834          * @brief Receives status messages
2835          *
2836          * @param array            $importer Array of the importer user
2837          * @param SimpleXMLElement $data     The message object
2838          * @param string           $xml      The original XML of the message
2839          *
2840          * @return int The message id of the newly created item
2841          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2842          * @throws \ImagickException
2843          */
2844         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2845         {
2846                 $author = Strings::escapeTags(XML::unescape($data->author));
2847                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2848                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2849                 $public = Strings::escapeTags(XML::unescape($data->public));
2850                 $text = XML::unescape($data->text);
2851                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2852
2853                 $contact = self::allowedContactByHandle($importer, $author, false);
2854                 if (!$contact) {
2855                         return false;
2856                 }
2857
2858                 $message_id = self::messageExists($importer["uid"], $guid);
2859                 if ($message_id) {
2860                         return true;
2861                 }
2862
2863                 $address = [];
2864                 if ($data->location) {
2865                         foreach ($data->location->children() as $fieldname => $data) {
2866                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2867                         }
2868                 }
2869
2870                 $body = Markdown::toBBCode($text);
2871
2872                 $datarray = [];
2873
2874                 // Attach embedded pictures to the body
2875                 if ($data->photo) {
2876                         foreach ($data->photo as $photo) {
2877                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2878                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2879                         }
2880
2881                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2882                 } else {
2883                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2884
2885                         // Add OEmbed and other information to the body
2886                         if (!self::isRedmatrix($contact["url"])) {
2887                                 $body = add_page_info_to_body($body, false, true);
2888                         }
2889                 }
2890
2891                 /// @todo enable support for polls
2892                 //if ($data->poll) {
2893                 //      foreach ($data->poll AS $poll)
2894                 //              print_r($poll);
2895                 //      die("poll!\n");
2896                 //}
2897
2898                 /// @todo enable support for events
2899
2900                 $datarray["uid"] = $importer["uid"];
2901                 $datarray["contact-id"] = $contact["id"];
2902                 $datarray["network"] = Protocol::DIASPORA;
2903
2904                 $datarray["author-link"] = $contact["url"];
2905                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2906
2907                 $datarray["owner-link"] = $datarray["author-link"];
2908                 $datarray["owner-id"] = $datarray["author-id"];
2909
2910                 $datarray["guid"] = $guid;
2911                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2912
2913                 $datarray["verb"] = ACTIVITY_POST;
2914                 $datarray["gravity"] = GRAVITY_PARENT;
2915
2916                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2917                 $datarray["source"] = $xml;
2918
2919                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2920
2921                 if ($provider_display_name != "") {
2922                         $datarray["app"] = $provider_display_name;
2923                 }
2924
2925                 $datarray["plink"] = self::plink($author, $guid);
2926                 $datarray["private"] = (($public == "false") ? 1 : 0);
2927                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2928
2929                 if (isset($address["address"])) {
2930                         $datarray["location"] = $address["address"];
2931                 }
2932
2933                 if (isset($address["lat"]) && isset($address["lng"])) {
2934                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2935                 }
2936
2937                 self::fetchGuid($datarray);
2938                 $message_id = Item::insert($datarray);
2939
2940                 self::sendParticipation($contact, $datarray);
2941
2942                 if ($message_id) {
2943                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2944                         if ($datarray['uid'] == 0) {
2945                                 Item::distribute($message_id);
2946                         }
2947                         return true;
2948                 } else {
2949                         return false;
2950                 }
2951         }
2952
2953         /* ************************************************************************************** *
2954          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2955          * ************************************************************************************** */
2956
2957         /**
2958          * @brief returnes the handle of a contact
2959          *
2960          * @param array $contact contact array
2961          *
2962          * @return string the handle in the format user@domain.tld
2963          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2964          */
2965         private static function myHandle(array $contact)
2966         {
2967                 if (!empty($contact["addr"])) {
2968                         return $contact["addr"];
2969                 }
2970
2971                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2972                 // So - just in case - we build the the address here.
2973                 if ($contact["nickname"] != "") {
2974                         $nick = $contact["nickname"];
2975                 } else {
2976                         $nick = $contact["nick"];
2977                 }
2978
2979                 return $nick . "@" . substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
2980         }
2981
2982
2983         /**
2984          * @brief Creates the data for a private message in the new format
2985          *
2986          * @param string $msg     The message that is to be transmitted
2987          * @param array  $user    The record of the sender
2988          * @param array  $contact Target of the communication
2989          * @param string $prvkey  The private key of the sender
2990          * @param string $pubkey  The public key of the receiver
2991          *
2992          * @return string The encrypted data
2993          * @throws \Exception
2994          */
2995         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2996         {
2997                 Logger::log("Message: ".$msg, Logger::DATA);
2998
2999                 // without a public key nothing will work
3000                 if (!$pubkey) {
3001                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
3002                         return false;
3003                 }
3004
3005                 $aes_key = openssl_random_pseudo_bytes(32);
3006                 $b_aes_key = base64_encode($aes_key);
3007                 $iv = openssl_random_pseudo_bytes(16);
3008                 $b_iv = base64_encode($iv);
3009
3010                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3011
3012                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3013
3014                 $encrypted_key_bundle = "";
3015                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3016
3017                 $json_object = json_encode(
3018                         ["aes_key" => base64_encode($encrypted_key_bundle),
3019                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3020                 );
3021
3022                 return $json_object;
3023         }
3024
3025         /**
3026          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3027          *
3028          * @param string $msg  The message that is to be transmitted
3029          * @param array  $user The record of the sender
3030          *
3031          * @return string The envelope
3032          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3033          */
3034         public static function buildMagicEnvelope($msg, array $user)
3035         {
3036                 $b64url_data = Strings::base64UrlEncode($msg);
3037                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3038
3039                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
3040                 $type = "application/xml";
3041                 $encoding = "base64url";
3042                 $alg = "RSA-SHA256";
3043                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
3044
3045                 // Fallback if the private key wasn't transmitted in the expected field
3046                 if ($user['uprvkey'] == "") {
3047                         $user['uprvkey'] = $user['prvkey'];
3048                 }
3049
3050                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3051                 $sig = Strings::base64UrlEncode($signature);
3052
3053                 $xmldata = ["me:env" => ["me:data" => $data,
3054                                                         "@attributes" => ["type" => $type],
3055                                                         "me:encoding" => $encoding,
3056                                                         "me:alg" => $alg,
3057                                                         "me:sig" => $sig,
3058                                                         "@attributes2" => ["key_id" => $key_id]]];
3059
3060                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3061
3062                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3063         }
3064
3065         /**
3066          * @brief Create the envelope for a message
3067          *
3068          * @param string $msg     The message that is to be transmitted
3069          * @param array  $user    The record of the sender
3070          * @param array  $contact Target of the communication
3071          * @param string $prvkey  The private key of the sender
3072          * @param string $pubkey  The public key of the receiver
3073          * @param bool   $public  Is the message public?
3074          *
3075          * @return string The message that will be transmitted to other servers
3076          * @throws \Exception
3077          */
3078         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3079         {
3080                 // The message is put into an envelope with the sender's signature
3081                 $envelope = self::buildMagicEnvelope($msg, $user);
3082
3083                 // Private messages are put into a second envelope, encrypted with the receivers public key
3084                 if (!$public) {
3085                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3086                 }
3087
3088                 return $envelope;
3089         }
3090
3091         /**
3092          * @brief Creates a signature for a message
3093          *
3094          * @param array $owner   the array of the owner of the message
3095          * @param array $message The message that is to be signed
3096          *
3097          * @return string The signature
3098          */
3099         private static function signature($owner, $message)
3100         {
3101                 $sigmsg = $message;
3102                 unset($sigmsg["author_signature"]);
3103                 unset($sigmsg["parent_author_signature"]);
3104
3105                 $signed_text = implode(";", $sigmsg);
3106
3107                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3108         }
3109
3110         /**
3111          * @brief Transmit a message to a target server
3112          *
3113          * @param array  $owner        the array of the item owner
3114          * @param array  $contact      Target of the communication
3115          * @param string $envelope     The message that is to be transmitted
3116          * @param bool   $public_batch Is it a public post?
3117          * @param bool   $queue_run    Is the transmission called from the queue?
3118          * @param string $guid         message guid
3119          *
3120          * @param bool   $no_queue
3121          * @return int Result of the transmission
3122          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3123          * @throws \ImagickException
3124          */
3125         public static function transmit(array $owner, array $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
3126         {
3127                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3128                 if (!$enabled) {
3129                         return 200;
3130                 }
3131
3132                 $logid = Strings::getRandomHex(4);
3133
3134                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3135
3136                 // We always try to use the data from the fcontact table.
3137                 // This is important for transmitting data to Friendica servers.
3138                 if (!empty($contact['addr'])) {
3139                         $fcontact = self::personByHandle($contact['addr']);
3140                         if (!empty($fcontact)) {
3141                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3142                         }
3143                 }
3144
3145                 if (!$dest_url) {
3146                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3147                         return 0;
3148                 }
3149
3150                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3151
3152                 if (!$queue_run && Queue::wasDelayed($contact["id"])) {
3153                         $return_code = 0;
3154                 } else {
3155                         if (!intval(Config::get("system", "diaspora_test"))) {
3156                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3157
3158                                 $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3159                                 $return_code = $postResult->getReturnCode();
3160                         } else {
3161                                 Logger::log("test_mode");
3162                                 return 200;
3163                         }
3164                 }
3165
3166                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3167
3168                 if (!$return_code || (($return_code == 503) && (stristr($postResult->getHeader(), "retry-after")))) {
3169                         if (!$no_queue && !empty($contact['contact-type']) && ($contact['contact-type'] != Contact::TYPE_RELAY)) {
3170                                 Logger::log("queue message");
3171                                 // queue message for redelivery
3172                                 Queue::add($contact["id"], Protocol::DIASPORA, $envelope, $public_batch, $guid);
3173                         }
3174
3175                         // The message could not be delivered. We mark the contact as "dead"
3176                         Contact::markForArchival($contact);
3177                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3178                         // We successfully delivered a message, the contact is alive
3179                         Contact::unmarkForArchival($contact);
3180                 }
3181
3182                 return $return_code ? $return_code : -1;
3183         }
3184
3185
3186         /**
3187          * @brief Build the post xml
3188          *
3189          * @param string $type    The message type
3190          * @param array  $message The message data
3191          *
3192          * @return string The post XML
3193          */
3194         public static function buildPostXml($type, $message)
3195         {
3196                 $data = [$type => $message];
3197
3198                 return XML::fromArray($data, $xml);
3199         }
3200
3201         /**
3202          * @brief Builds and transmit messages
3203          *
3204          * @param array  $owner        the array of the item owner
3205          * @param array  $contact      Target of the communication
3206          * @param string $type         The message type
3207          * @param array  $message      The message data
3208          * @param bool   $public_batch Is it a public post?
3209          * @param string $guid         message guid
3210          * @param bool   $spool        Should the transmission be spooled or transmitted?
3211          *
3212          * @return int Result of the transmission
3213          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3214          * @throws \ImagickException
3215          */
3216         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3217         {
3218                 $msg = self::buildPostXml($type, $message);
3219
3220                 Logger::log('message: '.$msg, Logger::DATA);
3221                 Logger::log('send guid '.$guid, Logger::DEBUG);
3222
3223                 // Fallback if the private key wasn't transmitted in the expected field
3224                 if (empty($owner['uprvkey'])) {
3225                         $owner['uprvkey'] = $owner['prvkey'];
3226                 }
3227
3228                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3229
3230                 if ($spool) {
3231                         Queue::add($contact['id'], Protocol::DIASPORA, $envelope, $public_batch, $guid);
3232                         return true;
3233                 } else {
3234                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3235                 }
3236
3237                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3238
3239                 return $return_code;
3240         }
3241
3242         /**
3243          * @brief sends a participation (Used to get all further updates)
3244          *
3245          * @param array $contact Target of the communication
3246          * @param array $item    Item array
3247          *
3248          * @return int The result of the transmission
3249          * @throws \Exception
3250          */
3251         private static function sendParticipation(array $contact, array $item)
3252         {
3253                 // Don't send notifications for private postings
3254                 if ($item['private']) {
3255                         return;
3256                 }
3257
3258                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3259
3260                 $result = Cache::get($cachekey);
3261                 if (!is_null($result)) {
3262                         return;
3263                 }
3264
3265                 // Fetch some user id to have a valid handle to transmit the participation.
3266                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3267                 // If the item belongs to a user, we take this user id.
3268                 if ($item['uid'] == 0) {
3269                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3270                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3271                         $owner = User::getOwnerDataById($first_user['uid']);
3272                 } else {
3273                         $owner = User::getOwnerDataById($item['uid']);
3274                 }
3275
3276                 $author = self::myHandle($owner);
3277
3278                 $message = ["author" => $author,
3279                                 "guid" => System::createUUID(),
3280                                 "parent_type" => "Post",
3281                                 "parent_guid" => $item["guid"]];
3282
3283                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3284
3285                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3286                 Cache::set($cachekey, $item["guid"], Cache::QUARTER_HOUR);
3287
3288                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3289         }
3290
3291         /**
3292          * @brief sends an account migration
3293          *
3294          * @param array $owner   the array of the item owner
3295          * @param array $contact Target of the communication
3296          * @param int   $uid     User ID
3297          *
3298          * @return int The result of the transmission
3299          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3300          * @throws \ImagickException
3301          */
3302         public static function sendAccountMigration(array $owner, array $contact, $uid)
3303         {
3304                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3305                 $profile = self::createProfileData($uid);
3306
3307                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3308                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3309
3310                 $message = ["author" => $old_handle,
3311                                 "profile" => $profile,
3312                                 "signature" => $signature];
3313
3314                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3315
3316                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3317         }
3318
3319         /**
3320          * @brief Sends a "share" message
3321          *
3322          * @param array $owner   the array of the item owner
3323          * @param array $contact Target of the communication
3324          *
3325          * @return int The result of the transmission
3326          * @throws \Exception
3327          */
3328         public static function sendShare(array $owner, array $contact)
3329         {
3330                 /**
3331                  * @todo support the different possible combinations of "following" and "sharing"
3332                  * Currently, Diaspora only interprets the "sharing" field
3333                  *
3334                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3335                  */
3336
3337                 /*
3338                 switch ($contact["rel"]) {
3339                         case Contact::FRIEND:
3340                                 $following = true;
3341                                 $sharing = true;
3342
3343                         case Contact::SHARING:
3344                                 $following = false;
3345                                 $sharing = true;
3346
3347                         case Contact::FOLLOWER:
3348                                 $following = true;
3349                                 $sharing = false;
3350                 }
3351                 */
3352
3353                 $message = ["author" => self::myHandle($owner),
3354                                 "recipient" => $contact["addr"],
3355                                 "following" => "true",
3356                                 "sharing" => "true"];
3357
3358                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3359
3360                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3361         }
3362
3363         /**
3364          * @brief sends an "unshare"
3365          *
3366          * @param array $owner   the array of the item owner
3367          * @param array $contact Target of the communication
3368          *
3369          * @return int The result of the transmission
3370          * @throws \Exception
3371          */
3372         public static function sendUnshare(array $owner, array $contact)
3373         {
3374                 $message = ["author" => self::myHandle($owner),
3375                                 "recipient" => $contact["addr"],
3376                                 "following" => "false",
3377                                 "sharing" => "false"];
3378
3379                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3380
3381                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3382         }
3383
3384         /**
3385          * @brief Checks a message body if it is a reshare
3386          *
3387          * @param string $body     The message body that is to be check
3388          * @param bool   $complete Should it be a complete check or a simple check?
3389          *
3390          * @return array|bool Reshare details or "false" if no reshare
3391          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3392          * @throws \ImagickException
3393          */
3394         public static function isReshare($body, $complete = true)
3395         {
3396                 $body = trim($body);
3397
3398                 // Skip if it isn't a pure repeated messages
3399                 // Does it start with a share?
3400                 if ((strpos($body, "[share") > 0) && $complete) {
3401                         return false;
3402                 }
3403
3404                 // Does it end with a share?
3405                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3406                         return false;
3407                 }
3408
3409                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3410                 // Skip if there is no shared message in there
3411                 if ($body == $attributes) {
3412                         return false;
3413                 }
3414
3415                 // If we don't do the complete check we quit here
3416
3417                 $guid = "";
3418                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3419                 if (!empty($matches[1])) {
3420                         $guid = $matches[1];
3421                 }
3422
3423                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3424                 if (!empty($matches[1])) {
3425                         $guid = $matches[1];
3426                 }
3427
3428                 if (($guid != "") && $complete) {
3429                         $condition = ['guid' => $guid, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3430                         $item = Item::selectFirst(['contact-id'], $condition);
3431                         if (DBA::isResult($item)) {
3432                                 $ret= [];
3433                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3434                                 $ret["root_guid"] = $guid;
3435                                 return $ret;
3436                         } elseif ($complete) {
3437                                 // We are resharing something that isn't a DFRN or Diaspora post.
3438                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3439                                 return false;
3440                         }
3441                 } elseif (($guid == "") && $complete) {
3442                         return false;
3443                 }
3444
3445                 $ret["root_guid"] = $guid;
3446
3447                 $profile = "";
3448                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3449                 if (!empty($matches[1])) {
3450                         $profile = $matches[1];
3451                 }
3452
3453                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3454                 if (!empty($matches[1])) {
3455                         $profile = $matches[1];
3456                 }
3457
3458                 $ret= [];
3459
3460                 if ($profile != "") {
3461                         if (Contact::getIdForURL($profile)) {
3462                                 $author = Contact::getDetailsByURL($profile);
3463                                 $ret["root_handle"] = $author['addr'];
3464                         }
3465                 }
3466
3467                 if (empty($ret) && !$complete) {
3468                         return true;
3469                 }
3470
3471                 return $ret;
3472         }
3473
3474         /**
3475          * @brief Create an event array
3476          *
3477          * @param integer $event_id The id of the event
3478          *
3479          * @return array with event data
3480          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3481          */
3482         private static function buildEvent($event_id)
3483         {
3484                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3485                 if (!DBA::isResult($r)) {
3486                         return [];
3487                 }
3488
3489                 $event = $r[0];
3490
3491                 $eventdata = [];
3492
3493                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3494                 if (!DBA::isResult($r)) {
3495                         return [];
3496                 }
3497
3498                 $user = $r[0];
3499
3500                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3501                 if (!DBA::isResult($r)) {
3502                         return [];
3503                 }
3504
3505                 $owner = $r[0];
3506
3507                 $eventdata['author'] = self::myHandle($owner);
3508
3509                 if ($event['guid']) {
3510                         $eventdata['guid'] = $event['guid'];
3511                 }
3512
3513                 $mask = DateTimeFormat::ATOM;
3514
3515                 /// @todo - establish "all day" events in Friendica
3516                 $eventdata["all_day"] = "false";
3517
3518                 $eventdata['timezone'] = 'UTC';
3519                 if (!$event['adjust'] && $user['timezone']) {
3520                         $eventdata['timezone'] = $user['timezone'];
3521                 }
3522
3523                 if ($event['start']) {
3524                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3525                 }
3526                 if ($event['finish'] && !$event['nofinish']) {
3527                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3528                 }
3529                 if ($event['summary']) {
3530                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3531                 }
3532                 if ($event['desc']) {
3533                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3534                 }
3535                 if ($event['location']) {
3536                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3537                         $coord = Map::getCoordinates($event['location']);
3538
3539                         $location = [];
3540                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3541                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3542                                 $location["lat"] = $coord['lat'];
3543                                 $location["lng"] = $coord['lon'];
3544                         } else {
3545                                 $location["lat"] = 0;
3546                                 $location["lng"] = 0;
3547                         }
3548                         $eventdata['location'] = $location;
3549                 }
3550
3551                 return $eventdata;
3552         }
3553
3554         /**
3555          * @brief Create a post (status message or reshare)
3556          *
3557          * @param array $item  The item that will be exported
3558          * @param array $owner the array of the item owner
3559          *
3560          * @return array
3561          * 'type' -> Message type ("status_message" or "reshare")
3562          * 'message' -> Array of XML elements of the status
3563          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3564          * @throws \ImagickException
3565          */
3566         public static function buildStatus(array $item, array $owner)
3567         {
3568                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3569
3570                 $result = Cache::get($cachekey);
3571                 if (!is_null($result)) {
3572                         return $result;
3573                 }
3574
3575                 $myaddr = self::myHandle($owner);
3576
3577                 $public = ($item["private"] ? "false" : "true");
3578
3579                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3580
3581                 // Detect a share element and do a reshare
3582                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3583                         $message = ["author" => $myaddr,
3584                                         "guid" => $item["guid"],
3585                                         "created_at" => $created,
3586                                         "root_author" => $ret["root_handle"],
3587                                         "root_guid" => $ret["root_guid"],
3588                                         "provider_display_name" => $item["app"],
3589                                         "public" => $public];
3590
3591                         $type = "reshare";
3592                 } else {
3593                         $title = $item["title"];
3594                         $body = $item["body"];
3595
3596                         if ($item['author-link'] != $item['owner-link']) {
3597                                 require_once 'mod/share.php';
3598                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3599                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3600                         }
3601
3602                         // convert to markdown
3603                         $body = html_entity_decode(BBCode::toMarkdown($body));
3604
3605                         // Adding the title
3606                         if (strlen($title)) {
3607                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3608                         }
3609
3610                         if ($item["attach"]) {
3611                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3612                                 if ($cnt) {
3613                                         $body .= "\n".L10n::t("Attachments:")."\n";
3614                                         foreach ($matches as $mtch) {
3615                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3616                                         }
3617                                 }
3618                         }
3619
3620                         $location = [];
3621
3622                         if ($item["location"] != "")
3623                                 $location["address"] = $item["location"];
3624
3625                         if ($item["coord"] != "") {
3626                                 $coord = explode(" ", $item["coord"]);
3627                                 $location["lat"] = $coord[0];
3628                                 $location["lng"] = $coord[1];
3629                         }
3630
3631                         $message = ["author" => $myaddr,
3632                                         "guid" => $item["guid"],
3633                                         "created_at" => $created,
3634                                         "public" => $public,
3635                                         "text" => $body,
3636                                         "provider_display_name" => $item["app"],
3637                                         "location" => $location];
3638
3639                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3640                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3641                                 unset($message["location"]);
3642                         }
3643
3644                         if ($item['event-id'] > 0) {
3645                                 $event = self::buildEvent($item['event-id']);
3646                                 if (count($event)) {
3647                                         $message['event'] = $event;
3648
3649                                         if (!empty($event['location']['address']) &&
3650                                                 !empty($event['location']['lat']) &&
3651                                                 !empty($event['location']['lng'])) {
3652                                                 $message['location'] = $event['location'];
3653                                         }
3654
3655                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3656                                         // $message['text'] = '';
3657                                 }
3658                         }
3659
3660                         $type = "status_message";
3661                 }
3662
3663                 $msg = ["type" => $type, "message" => $message];
3664
3665                 Cache::set($cachekey, $msg, Cache::QUARTER_HOUR);
3666
3667                 return $msg;
3668         }
3669
3670         private static function prependParentAuthorMention($body, $profile_url)
3671         {
3672                 $profile = Contact::getDetailsByURL($profile_url);
3673                 if (!empty($profile['addr'])
3674                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3675                         && !strstr($body, $profile['addr'])
3676                         && !strstr($body, $profile_url)
3677                 ) {
3678                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3679                 }
3680
3681                 return $body;
3682         }
3683
3684         /**
3685          * @brief Sends a post
3686          *
3687          * @param array $item         The item that will be exported
3688          * @param array $owner        the array of the item owner
3689          * @param array $contact      Target of the communication
3690          * @param bool  $public_batch Is it a public post?
3691          *
3692          * @return int The result of the transmission
3693          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3694          * @throws \ImagickException
3695          */
3696         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3697         {
3698                 $status = self::buildStatus($item, $owner);
3699
3700                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3701         }
3702
3703         /**
3704          * @brief Creates a "like" object
3705          *
3706          * @param array $item  The item that will be exported
3707          * @param array $owner the array of the item owner
3708          *
3709          * @return array The data for a "like"
3710          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3711          */
3712         private static function constructLike(array $item, array $owner)
3713         {
3714                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3715                 if (!DBA::isResult($parent)) {
3716                         return false;
3717                 }
3718
3719                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3720                 $positive = null;
3721                 if ($item['verb'] === ACTIVITY_LIKE) {
3722                         $positive = "true";
3723                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3724                         $positive = "false";
3725                 }
3726
3727                 return(["author" => self::myHandle($owner),
3728                                 "guid" => $item["guid"],
3729                                 "parent_guid" => $parent["guid"],
3730                                 "parent_type" => $target_type,
3731                                 "positive" => $positive,
3732                                 "author_signature" => ""]);
3733         }
3734
3735         /**
3736          * @brief Creates an "EventParticipation" object
3737          *
3738          * @param array $item  The item that will be exported
3739          * @param array $owner the array of the item owner
3740          *
3741          * @return array The data for an "EventParticipation"
3742          * @throws \Exception
3743          */
3744         private static function constructAttend(array $item, array $owner)
3745         {
3746                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3747                 if (!DBA::isResult($parent)) {
3748                         return false;
3749                 }
3750
3751                 switch ($item['verb']) {
3752                         case ACTIVITY_ATTEND:
3753                                 $attend_answer = 'accepted';
3754                                 break;
3755                         case ACTIVITY_ATTENDNO:
3756                                 $attend_answer = 'declined';
3757                                 break;
3758                         case ACTIVITY_ATTENDMAYBE:
3759                                 $attend_answer = 'tentative';
3760                                 break;
3761                         default:
3762                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3763                                 return false;
3764                 }
3765
3766                 return(["author" => self::myHandle($owner),
3767                                 "guid" => $item["guid"],
3768                                 "parent_guid" => $parent["guid"],
3769                                 "status" => $attend_answer,
3770                                 "author_signature" => ""]);
3771         }
3772
3773         /**
3774          * @brief Creates the object for a comment
3775          *
3776          * @param array $item  The item that will be exported
3777          * @param array $owner the array of the item owner
3778          *
3779          * @return array|false The data for a comment
3780          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3781          */
3782         private static function constructComment(array $item, array $owner)
3783         {
3784                 $cachekey = "diaspora:constructComment:".$item['guid'];
3785
3786                 $result = Cache::get($cachekey);
3787                 if (!is_null($result)) {
3788                         return $result;
3789                 }
3790
3791                 $toplevel_item = Item::selectFirst(['guid', 'author-link'], ['id' => $item["parent"], 'parent' => $item["parent"]]);
3792                 if (!DBA::isResult($toplevel_item)) {
3793                         Logger::error('Missing parent conversation item', ['parent' => $item["parent"]]);
3794                         return false;
3795                 }
3796
3797                 $thread_parent_item = $toplevel_item;
3798                 if ($item['thr-parent'] != $item['parent-uri']) {
3799                         $thread_parent_item = Item::selectFirst(['guid', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3800                 }
3801
3802                 $body = $item["body"];
3803
3804                 if ((empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3805                         && !Config::get('system', 'disable_implicit_mentions')
3806                 ) {
3807                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3808                 }
3809
3810                 $text = html_entity_decode(BBCode::toMarkdown($body));
3811                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3812
3813                 $comment = [
3814                         "author"      => self::myHandle($owner),
3815                         "guid"        => $item["guid"],
3816                         "created_at"  => $created,
3817                         "parent_guid" => $toplevel_item["guid"],
3818                         "text"        => $text,
3819                         "author_signature" => ""
3820                 ];
3821
3822                 // Send the thread parent guid only if it is a threaded comment
3823                 if ($item['thr-parent'] != $item['parent-uri']) {
3824                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3825                 }
3826
3827                 Cache::set($cachekey, $comment, Cache::QUARTER_HOUR);
3828
3829                 return($comment);
3830         }
3831
3832         /**
3833          * @brief Send a like or a comment
3834          *
3835          * @param array $item         The item that will be exported
3836          * @param array $owner        the array of the item owner
3837          * @param array $contact      Target of the communication
3838          * @param bool  $public_batch Is it a public post?
3839          *
3840          * @return int The result of the transmission
3841          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3842          * @throws \ImagickException
3843          */
3844         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3845         {
3846                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3847                         $message = self::constructAttend($item, $owner);
3848                         $type = "event_participation";
3849                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3850                         $message = self::constructLike($item, $owner);
3851                         $type = "like";
3852                 } elseif (!in_array($item["verb"], [ACTIVITY_FOLLOW])) {
3853                         $message = self::constructComment($item, $owner);
3854                         $type = "comment";
3855                 }
3856
3857                 if (empty($message)) {
3858                         return false;
3859                 }
3860
3861                 $message["author_signature"] = self::signature($owner, $message);
3862
3863                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3864         }
3865
3866         /**
3867          * @brief Creates a message from a signature record entry
3868          *
3869          * @param array $item The item that will be exported
3870          * @return array The message
3871          */
3872         private static function messageFromSignature(array $item)
3873         {
3874                 // Split the signed text
3875                 $signed_parts = explode(";", $item['signed_text']);
3876
3877                 if ($item["deleted"]) {
3878                         $message = ["author" => $item['signer'],
3879                                         "target_guid" => $signed_parts[0],
3880                                         "target_type" => $signed_parts[1]];
3881                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3882                         $message = ["author" => $signed_parts[4],
3883                                         "guid" => $signed_parts[1],
3884                                         "parent_guid" => $signed_parts[3],
3885                                         "parent_type" => $signed_parts[2],
3886                                         "positive" => $signed_parts[0],
3887                                         "author_signature" => $item['signature'],
3888                                         "parent_author_signature" => ""];
3889                 } else {
3890                         // Remove the comment guid
3891                         $guid = array_shift($signed_parts);
3892
3893                         // Remove the parent guid
3894                         $parent_guid = array_shift($signed_parts);
3895
3896                         // Remove the handle
3897                         $handle = array_pop($signed_parts);
3898
3899                         $message = [
3900                                 "author" => $handle,
3901                                 "guid" => $guid,
3902                                 "parent_guid" => $parent_guid,
3903                                 "text" => implode(";", $signed_parts),
3904                                 "author_signature" => $item['signature'],
3905                                 "parent_author_signature" => ""
3906                         ];
3907                 }
3908                 return $message;
3909         }
3910
3911         /**
3912          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3913          *
3914          * @param array $item         The item that will be exported
3915          * @param array $owner        the array of the item owner
3916          * @param array $contact      Target of the communication
3917          * @param bool  $public_batch Is it a public post?
3918          *
3919          * @return int The result of the transmission
3920          * @throws \Exception
3921          */
3922         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3923         {
3924                 if ($item["deleted"]) {
3925                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3926                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3927                         $type = "like";
3928                 } else {
3929                         $type = "comment";
3930                 }
3931
3932                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3933
3934                 // Old way - is used by the internal Friendica functions
3935                 /// @todo Change all signatur storing functions to the new format
3936                 if ($item['signed_text'] && $item['signature'] && $item['signer']) {
3937                         $message = self::messageFromSignature($item);
3938                 } else {// New way
3939                         $msg = json_decode($item['signed_text'], true);
3940
3941                         $message = [];
3942                         if (is_array($msg)) {
3943                                 foreach ($msg as $field => $data) {
3944                                         if (!$item["deleted"]) {
3945                                                 if ($field == "diaspora_handle") {
3946                                                         $field = "author";
3947                                                 }
3948                                                 if ($field == "target_type") {
3949                                                         $field = "parent_type";
3950                                                 }
3951                                         }
3952
3953                                         $message[$field] = $data;
3954                                 }
3955                         } else {
3956                                 Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3957                         }
3958                 }
3959
3960                 $message["parent_author_signature"] = self::signature($owner, $message);
3961
3962                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
3963
3964                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3965         }
3966
3967         /**
3968          * @brief Sends a retraction (deletion) of a message, like or comment
3969          *
3970          * @param array $item         The item that will be exported
3971          * @param array $owner        the array of the item owner
3972          * @param array $contact      Target of the communication
3973          * @param bool  $public_batch Is it a public post?
3974          * @param bool  $relay        Is the retraction transmitted from a relay?
3975          *
3976          * @return int The result of the transmission
3977          * @throws \Exception
3978          */
3979         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3980         {
3981                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3982
3983                 $msg_type = "retraction";
3984
3985                 if ($item['id'] == $item['parent']) {
3986                         $target_type = "Post";
3987                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3988                         $target_type = "Like";
3989                 } else {
3990                         $target_type = "Comment";
3991                 }
3992
3993                 $message = ["author" => $itemaddr,
3994                                 "target_guid" => $item['guid'],
3995                                 "target_type" => $target_type];
3996
3997                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
3998
3999                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
4000         }
4001
4002         /**
4003          * @brief Sends a mail
4004          *
4005          * @param array $item    The item that will be exported
4006          * @param array $owner   The owner
4007          * @param array $contact Target of the communication
4008          *
4009          * @return int The result of the transmission
4010          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4011          * @throws \ImagickException
4012          */
4013         public static function sendMail(array $item, array $owner, array $contact)
4014         {
4015                 $myaddr = self::myHandle($owner);
4016
4017                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
4018                 if (!DBA::isResult($cnv)) {
4019                         Logger::log("conversation not found.");
4020                         return;
4021                 }
4022
4023                 $body = BBCode::toMarkdown($item["body"]);
4024                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4025
4026                 $msg = [
4027                         "author" => $myaddr,
4028                         "guid" => $item["guid"],
4029                         "conversation_guid" => $cnv["guid"],
4030                         "text" => $body,
4031                         "created_at" => $created,
4032                 ];
4033
4034                 if ($item["reply"]) {
4035                         $message = $msg;
4036                         $type = "message";
4037                 } else {
4038                         $message = [
4039                                 "author" => $cnv["creator"],
4040                                 "guid" => $cnv["guid"],
4041                                 "subject" => $cnv["subject"],
4042                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4043                                 "participants" => $cnv["recips"],
4044                                 "message" => $msg
4045                         ];
4046
4047                         $type = "conversation";
4048                 }
4049
4050                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4051         }
4052
4053         /**
4054          * @brief Split a name into first name and last name
4055          *
4056          * @param string $name The name
4057          *
4058          * @return array The array with "first" and "last"
4059          */
4060         public static function splitName($name) {
4061                 $name = trim($name);
4062
4063                 // Is the name longer than 64 characters? Then cut the rest of it.
4064                 if (strlen($name) > 64) {
4065                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4066                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4067                         } else {
4068                                 $name = substr($name, 0, 64);
4069                         }
4070                 }
4071
4072                 // Take the first word as first name
4073                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4074                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4075                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4076                         return ['first' => $first, 'last' => $last];
4077                 }
4078
4079                 // Take the last word as last name
4080                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4081                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4082
4083                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4084                         return ['first' => $first, 'last' => $last];
4085                 }
4086
4087                 // Take the first 32 characters if there is no space in the first 32 characters
4088                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4089                         $first = substr($name, 0, 32);
4090                         $last = substr($name, 32);
4091                         return ['first' => $first, 'last' => $last];
4092                 }
4093
4094                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4095                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4096
4097                 // Check if the last name is longer than 32 characters
4098                 if (strlen($last) > 32) {
4099                         if (strpos($last, ' ') <= 32) {
4100                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4101                         } else {
4102                                 $last = substr($last, 0, 32);
4103                         }
4104                 }
4105
4106                 return ['first' => $first, 'last' => $last];
4107         }
4108
4109         /**
4110          * @brief Create profile data
4111          *
4112          * @param int $uid The user id
4113          *
4114          * @return array The profile data
4115          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4116          */
4117         private static function createProfileData($uid)
4118         {
4119                 $r = q(
4120                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4121                         FROM `profile`
4122                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4123                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4124                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4125                         intval($uid)
4126                 );
4127
4128                 if (!$r) {
4129                         return [];
4130                 }
4131
4132                 $profile = $r[0];
4133                 $handle = $profile["addr"];
4134
4135                 $split_name = self::splitName($profile['name']);
4136                 $first = $split_name['first'];
4137                 $last = $split_name['last'];
4138
4139                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4140                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4141                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4142                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4143
4144                 $dob = null;
4145                 $about = null;
4146                 $location = null;
4147                 $tags = null;
4148                 if ($searchable === 'true') {
4149                         $dob = '';
4150
4151                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4152                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4153                                 if ($year < 1004) {
4154                                         $year = 1004;
4155                                 }
4156                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4157                         }
4158
4159                         $about = $profile['about'];
4160                         $about = strip_tags(BBCode::convert($about));
4161
4162                         $location = Profile::formatLocation($profile);
4163                         $tags = '';
4164                         if ($profile['pub_keywords']) {
4165                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4166                                 $kw = str_replace('  ', ' ', $kw);
4167                                 $arr = explode(' ', $kw);
4168                                 if (count($arr)) {
4169                                         for ($x = 0; $x < 5; $x ++) {
4170                                                 if (!empty($arr[$x])) {
4171                                                         $tags .= '#'. trim($arr[$x]) .' ';
4172                                                 }
4173                                         }
4174                                 }
4175                         }
4176                         $tags = trim($tags);
4177                 }
4178
4179                 return ["author" => $handle,
4180                                 "first_name" => $first,
4181                                 "last_name" => $last,
4182                                 "image_url" => $large,
4183                                 "image_url_medium" => $medium,
4184                                 "image_url_small" => $small,
4185                                 "birthday" => $dob,
4186                                 "gender" => $profile['gender'],
4187                                 "bio" => $about,
4188                                 "location" => $location,
4189                                 "searchable" => $searchable,
4190                                 "nsfw" => "false",
4191                                 "tag_string" => $tags];
4192         }
4193
4194         /**
4195          * @brief Sends profile data
4196          *
4197          * @param int  $uid    The user id
4198          * @param bool $recips optional, default false
4199          * @return void
4200          * @throws \Exception
4201          */
4202         public static function sendProfile($uid, $recips = false)
4203         {
4204                 if (!$uid) {
4205                         return;
4206                 }
4207
4208                 $owner = User::getOwnerDataById($uid);
4209                 if (!$owner) {
4210                         return;
4211                 }
4212
4213                 if (!$recips) {
4214                         $recips = q(
4215                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4216                                 AND `uid` = %d AND `rel` != %d",
4217                                 DBA::escape(Protocol::DIASPORA),
4218                                 intval($uid),
4219                                 intval(Contact::SHARING)
4220                         );
4221                 }
4222
4223                 if (!$recips) {
4224                         return;
4225                 }
4226
4227                 $message = self::createProfileData($uid);
4228
4229                 foreach ($recips as $recip) {
4230                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4231                         self::buildAndTransmit($owner, $recip, "profile", $message, false, "", false);
4232                 }
4233         }
4234
4235         /**
4236          * @brief Creates the signature for likes that are created on our system
4237          *
4238          * @param integer $uid  The user of that comment
4239          * @param array   $item Item array
4240          *
4241          * @return array Signed content
4242          * @throws \Exception
4243          */
4244         public static function createLikeSignature($uid, array $item)
4245         {
4246                 $owner = User::getOwnerDataById($uid);
4247                 if (empty($owner)) {
4248                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4249                         return false;
4250                 }
4251
4252                 if (!in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4253                         return false;
4254                 }
4255
4256                 $message = self::constructLike($item, $owner);
4257                 if ($message === false) {
4258                         return false;
4259                 }
4260
4261                 $message["author_signature"] = self::signature($owner, $message);
4262
4263                 return $message;
4264         }
4265
4266         /**
4267          * @brief Creates the signature for Comments that are created on our system
4268          *
4269          * @param integer $uid  The user of that comment
4270          * @param array   $item Item array
4271          *
4272          * @return array Signed content
4273          * @throws \Exception
4274          */
4275         public static function createCommentSignature($uid, array $item)
4276         {
4277                 $owner = User::getOwnerDataById($uid);
4278                 if (empty($owner)) {
4279                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4280                         return false;
4281                 }
4282
4283                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4284                 $item['thr-parent'] = $item['parent-uri'];
4285
4286                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4287                 if (!DBA::isResult($parent)) {
4288                         return;
4289                 }
4290
4291                 $item['parent-uri'] = $parent['parent-uri'];
4292
4293                 $message = self::constructComment($item, $owner);
4294                 if ($message === false) {
4295                         return false;
4296                 }
4297
4298                 $message["author_signature"] = self::signature($owner, $message);
4299
4300                 return $message;
4301         }
4302 }