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\DI;
  26 use Friendica\Model\Contact;
  27 use Friendica\Model\Conversation;
  28 use Friendica\Model\GContact;
  29 use Friendica\Model\Item;
  30 use Friendica\Model\ItemDeliveryData;
  31 use Friendica\Model\Mail;
  32 use Friendica\Model\Profile;
  33 use Friendica\Model\User;
  34 use Friendica\Network\Probe;
  35 use Friendica\Util\Crypto;
  36 use Friendica\Util\DateTimeFormat;
  37 use Friendica\Util\Map;
  38 use Friendica\Util\Network;
  39 use Friendica\Util\Strings;
  40 use Friendica\Util\XML;
  41 use Friendica\Worker\Delivery;
  42 use SimpleXMLElement;
  43
  44 /**
  45  * @brief This class contain functions to create and send Diaspora XML files
  46  *
  47  */
  48 class Diaspora
  49 {
  50         /**
  51          * Mark the relay contact of the given contact for archival
  52          * This is called whenever there is a communication issue with the server.
  53          * It avoids sending stuff to servers who don't exist anymore.
  54          * The relay contact is a technical contact entry that exists once per server.
  55          *
  56          * @param array $contact of the relay contact
  57          */
  58         public static function markRelayForArchival(array $contact)
  59         {
  60                 if (!empty($contact['contact-type']) && ($contact['contact-type'] == Contact::TYPE_RELAY)) {
  61                         // This is already the relay contact, we don't need to fetch it
  62                         $relay_contact = $contact;
  63                 } elseif (empty($contact['baseurl'])) {
  64                         if (!empty($contact['batch'])) {
  65                                 $condition = ['uid' => 0, 'network' => Protocol::FEDERATED, 'batch' => $contact['batch'], 'contact-type' => Contact::TYPE_RELAY];
  66                                 $relay_contact = DBA::selectFirst('contact', [], $condition);
  67                         } else {
  68                                 return;
  69                         }
  70                 } else {
  71                         $relay_contact = self::getRelayContact($contact['baseurl'], []);
  72                 }
  73
  74                 if (!empty($relay_contact)) {
  75                         Logger::info('Relay contact will be marked for archival', ['id' => $relay_contact['id'], 'url' => $relay_contact['url']]);
  76                         Contact::markForArchival($relay_contact);
  77                 }
  78         }
  79
  80         /**
  81          * @brief Return a list of relay servers
  82          *
  83          * The list contains not only the official relays but also servers that we serve directly
  84          *
  85          * @param integer $item_id  The id of the item that is sent
  86          * @param array   $contacts The previously fetched contacts
  87          *
  88          * @return array of relay servers
  89          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  90          */
  91         public static function relayList($item_id, array $contacts = [])
  92         {
  93                 $serverlist = [];
  94
  95                 // Fetching relay servers
  96                 $serverdata = Config::get("system", "relay_server");
  97
  98                 if (!empty($serverdata)) {
  99                         $servers = explode(",", $serverdata);
 100                         foreach ($servers as $server) {
 101                                 $serverlist[$server] = trim($server);
 102                         }
 103                 }
 104
 105                 if (Config::get("system", "relay_directly", false)) {
 106                         // We distribute our stuff based on the parent to ensure that the thread will be complete
 107                         $parent = Item::selectFirst(['parent'], ['id' => $item_id]);
 108                         if (!DBA::isResult($parent)) {
 109                                 return;
 110                         }
 111
 112                         // Servers that want to get all content
 113                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
 114                         while ($server = DBA::fetch($servers)) {
 115                                 $serverlist[$server['url']] = $server['url'];
 116                         }
 117
 118                         // All tags of the current post
 119                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
 120                         $tags = DBA::select('term', ['term'], $condition);
 121                         $taglist = [];
 122                         while ($tag = DBA::fetch($tags)) {
 123                                 $taglist[] = $tag['term'];
 124                         }
 125
 126                         // All servers who wants content with this tag
 127                         $tagserverlist = [];
 128                         if (!empty($taglist)) {
 129                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
 130                                 while ($server = DBA::fetch($tagserver)) {
 131                                         $tagserverlist[] = $server['gserver-id'];
 132                                 }
 133                         }
 134
 135                         // All adresses with the given id
 136                         if (!empty($tagserverlist)) {
 137                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 138                                 while ($server = DBA::fetch($servers)) {
 139                                         $serverlist[$server['url']] = $server['url'];
 140                                 }
 141                         }
 142                 }
 143
 144                 // Now we are collecting all relay contacts
 145                 foreach ($serverlist as $server_url) {
 146                         // We don't send messages to ourselves
 147                         if (Strings::compareLink($server_url, DI::baseUrl())) {
 148                                 continue;
 149                         }
 150                         $contact = self::getRelayContact($server_url);
 151                         if (is_bool($contact)) {
 152                                 continue;
 153                         }
 154
 155                         $exists = false;
 156                         foreach ($contacts as $entry) {
 157                                 if ($entry['batch'] == $contact['batch']) {
 158                                         $exists = true;
 159                                 }
 160                         }
 161
 162                         if (!$exists) {
 163                                 $contacts[] = $contact;
 164                         }
 165                 }
 166
 167                 return $contacts;
 168         }
 169
 170         /**
 171          * @brief Return a contact for a given server address or creates a dummy entry
 172          *
 173          * @param string $server_url The url of the server
 174          * @param array $fields Fieldlist
 175          * @return array with the contact
 176          * @throws \Exception
 177          */
 178         private static function getRelayContact(string $server_url, array $fields = ['batch', 'id', 'url', 'name', 'network', 'protocol', 'archive', 'blocked'])
 179         {
 180                 // Fetch the relay contact
 181                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 182                         'contact-type' => Contact::TYPE_RELAY];
 183                 $contact = DBA::selectFirst('contact', $fields, $condition);
 184
 185                 if (DBA::isResult($contact)) {
 186                         if ($contact['archive'] || $contact['blocked']) {
 187                                 return false;
 188                         }
 189                         return $contact;
 190                 } else {
 191                         self::setRelayContact($server_url);
 192
 193                         $contact = DBA::selectFirst('contact', $fields, $condition);
 194                         if (DBA::isResult($contact)) {
 195                                 return $contact;
 196                         }
 197                 }
 198
 199                 // It should never happen that we arrive here
 200                 return [];
 201         }
 202
 203         /**
 204          * @brief Update or insert a relay contact
 205          *
 206          * @param string $server_url     The url of the server
 207          * @param array  $network_fields Optional network specific fields
 208          * @throws \Exception
 209          */
 210         public static function setRelayContact($server_url, array $network_fields = [])
 211         {
 212                 $fields = ['created' => DateTimeFormat::utcNow(),
 213                         'name' => 'relay', 'nick' => 'relay', 'url' => $server_url,
 214                         'nurl' => Strings::normaliseLink($server_url),
 215                         'network' => Protocol::DIASPORA, 'uid' => 0,
 216                         'batch' => $server_url . '/receive/public',
 217                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 218                         'pending' => false, 'writable' => true,
 219                         'baseurl' => $server_url, 'contact-type' => Contact::TYPE_RELAY];
 220
 221                 $fields = array_merge($fields, $network_fields);
 222
 223                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url)];
 224                 $old = DBA::selectFirst('contact', [], $condition);
 225                 if (DBA::isResult($old)) {
 226                         unset($fields['created']);
 227                         $condition = ['id' => $old['id']];
 228
 229                         Logger::info('Update relay contact', ['fields' => $fields, 'condition' => $condition]);
 230                         DBA::update('contact', $fields, $condition, $old);
 231                 } else {
 232                         Logger::info('Create relay contact', ['fields' => $fields]);
 233                         Contact::insert($fields);
 234                 }
 235         }
 236
 237         /**
 238          * @brief Return a list of participating contacts for a thread
 239          *
 240          * This is used for the participation feature.
 241          * One of the parameters is a contact array.
 242          * This is done to avoid duplicates.
 243          *
 244          * @param integer $thread   The id of the thread
 245          * @param array   $contacts The previously fetched contacts
 246          *
 247          * @return array of relay servers
 248          * @throws \Exception
 249          */
 250         public static function participantsForThread($thread, array $contacts)
 251         {
 252                 $r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`url`, `contact`.`name`, `contact`.`network`, `contact`.`protocol`,
 253                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 254                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 255                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 256                                 WHERE `participation`.`iid` = ? AND NOT `contact`.`archive`", $thread);
 257
 258                 while ($contact = DBA::fetch($r)) {
 259                         if (!empty($contact['fnetwork'])) {
 260                                 $contact['network'] = $contact['fnetwork'];
 261                         }
 262                         unset($contact['fnetwork']);
 263
 264                         if (empty($contact['protocol'])) {
 265                                 $contact['protocol'] = $contact['network'];
 266                         }
 267
 268                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 269                                 $contact['batch'] = $contact['fbatch'];
 270                         }
 271                         unset($contact['fbatch']);
 272
 273                         $exists = false;
 274                         foreach ($contacts as $entry) {
 275                                 if ($entry['batch'] == $contact['batch']) {
 276                                         $exists = true;
 277                                 }
 278                         }
 279
 280                         if (!$exists) {
 281                                 $contacts[] = $contact;
 282                         }
 283                 }
 284                 DBA::close($r);
 285
 286                 return $contacts;
 287         }
 288
 289         /**
 290          * @brief repairs a signature that was double encoded
 291          *
 292          * The function is unused at the moment. It was copied from the old implementation.
 293          *
 294          * @param string  $signature The signature
 295          * @param string  $handle    The handle of the signature owner
 296          * @param integer $level     This value is only set inside this function to avoid endless loops
 297          *
 298          * @return string the repaired signature
 299          * @throws \Exception
 300          */
 301         private static function repairSignature($signature, $handle = "", $level = 1)
 302         {
 303                 if ($signature == "") {
 304                         return ($signature);
 305                 }
 306
 307                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 308                         $signature = base64_decode($signature);
 309                         Logger::log("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, Logger::DEBUG);
 310
 311                         // Do a recursive call to be able to fix even multiple levels
 312                         if ($level < 10) {
 313                                 $signature = self::repairSignature($signature, $handle, ++$level);
 314                         }
 315                 }
 316
 317                 return($signature);
 318         }
 319
 320         /**
 321          * @brief verify the envelope and return the verified data
 322          *
 323          * @param string $envelope The magic envelope
 324          *
 325          * @return string verified data
 326          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 327          * @throws \ImagickException
 328          */
 329         private static function verifyMagicEnvelope($envelope)
 330         {
 331                 $basedom = XML::parseString($envelope);
 332
 333                 if (!is_object($basedom)) {
 334                         Logger::log("Envelope is no XML file");
 335                         return false;
 336                 }
 337
 338                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 339
 340                 if (sizeof($children) == 0) {
 341                         Logger::log("XML has no children");
 342                         return false;
 343                 }
 344
 345                 $handle = "";
 346
 347                 $data = Strings::base64UrlDecode($children->data);
 348                 $type = $children->data->attributes()->type[0];
 349
 350                 $encoding = $children->encoding;
 351
 352                 $alg = $children->alg;
 353
 354                 $sig = Strings::base64UrlDecode($children->sig);
 355                 $key_id = $children->sig->attributes()->key_id[0];
 356                 if ($key_id != "") {
 357                         $handle = Strings::base64UrlDecode($key_id);
 358                 }
 359
 360                 $b64url_data = Strings::base64UrlEncode($data);
 361                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 362
 363                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 364
 365                 if ($handle == '') {
 366                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 367                         return false;
 368                 }
 369
 370                 $key = self::key($handle);
 371                 if ($key == '') {
 372                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 373                         return false;
 374                 }
 375
 376                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 377                 if (!$verify) {
 378                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 379                         return false;
 380                 }
 381
 382                 return $data;
 383         }
 384
 385         /**
 386          * @brief encrypts data via AES
 387          *
 388          * @param string $key  The AES key
 389          * @param string $iv   The IV (is used for CBC encoding)
 390          * @param string $data The data that is to be encrypted
 391          *
 392          * @return string encrypted data
 393          */
 394         private static function aesEncrypt($key, $iv, $data)
 395         {
 396                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 397         }
 398
 399         /**
 400          * @brief decrypts data via AES
 401          *
 402          * @param string $key       The AES key
 403          * @param string $iv        The IV (is used for CBC encoding)
 404          * @param string $encrypted The encrypted data
 405          *
 406          * @return string decrypted data
 407          */
 408         private static function aesDecrypt($key, $iv, $encrypted)
 409         {
 410                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 411         }
 412
 413         /**
 414          * @brief: Decodes incoming Diaspora message in the new format
 415          *
 416          * @param string  $raw      raw post message
 417          * @param string  $privKey   The private key of the importer
 418          * @param boolean $no_exit  Don't do an http exit on error
 419          *
 420          * @return array
 421          * 'message' -> decoded Diaspora XML message
 422          * 'author' -> author diaspora handle
 423          * 'key' -> author public key (converted to pkcs#8)
 424          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 425          * @throws \ImagickException
 426          */
 427         public static function decodeRaw(string $raw, string $privKey = '', bool $no_exit = false)
 428         {
 429                 $data = json_decode($raw);
 430
 431                 // Is it a private post? Then decrypt the outer Salmon
 432                 if (is_object($data)) {
 433                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 434                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 435
 436                         $outer_key_bundle = '';
 437                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 438                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 439
 440                         if (!is_object($j_outer_key_bundle)) {
 441                                 Logger::log('Outer Salmon did not verify. Discarding.');
 442                                 if ($no_exit) {
 443                                         return false;
 444                                 } else {
 445                                         throw new \Friendica\Network\HTTPException\BadRequestException();
 446                                 }
 447                         }
 448
 449                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 450                         $outer_key = base64_decode($j_outer_key_bundle->key);
 451
 452                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 453                 } else {
 454                         $xml = $raw;
 455                 }
 456
 457                 $basedom = XML::parseString($xml);
 458
 459                 if (!is_object($basedom)) {
 460                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 461                         if ($no_exit) {
 462                                 return false;
 463                         } else {
 464                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 465                         }
 466                 }
 467
 468                 $base = $basedom->children(ActivityNamespace::SALMON_ME);
 469
 470                 // Not sure if this cleaning is needed
 471                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 472
 473                 // Build the signed data
 474                 $type = $base->data[0]->attributes()->type[0];
 475                 $encoding = $base->encoding;
 476                 $alg = $base->alg;
 477                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 478
 479                 // This is the signature
 480                 $signature = Strings::base64UrlDecode($base->sig);
 481
 482                 // Get the senders' public key
 483                 $key_id = $base->sig[0]->attributes()->key_id[0];
 484                 $author_addr = base64_decode($key_id);
 485                 if ($author_addr == '') {
 486                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 487                         if ($no_exit) {
 488                                 return false;
 489                         } else {
 490                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 491                         }
 492                 }
 493
 494                 $key = self::key($author_addr);
 495                 if ($key == '') {
 496                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 497                         if ($no_exit) {
 498                                 return false;
 499                         } else {
 500                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 501                         }
 502                 }
 503
 504                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 505                 if (!$verify) {
 506                         Logger::log('Message did not verify. Discarding.');
 507                         if ($no_exit) {
 508                                 return false;
 509                         } else {
 510                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 511                         }
 512                 }
 513
 514                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 515                                 'author' => XML::unescape($author_addr),
 516                                 'key' => (string)$key];
 517         }
 518
 519         /**
 520          * @brief: Decodes incoming Diaspora message in the deprecated format
 521          *
 522          * @param string $xml      urldecoded Diaspora salmon
 523          * @param string $privKey  The private key of the importer
 524          *
 525          * @return array
 526          * 'message' -> decoded Diaspora XML message
 527          * 'author' -> author diaspora handle
 528          * 'key' -> author public key (converted to pkcs#8)
 529          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 530          * @throws \ImagickException
 531          */
 532         public static function decode(string $xml, string $privKey = '')
 533         {
 534                 $public = false;
 535                 $basedom = XML::parseString($xml);
 536
 537                 if (!is_object($basedom)) {
 538                         Logger::log("XML is not parseable.");
 539                         return false;
 540                 }
 541                 $children = $basedom->children('https://joindiaspora.com/protocol');
 542
 543                 $inner_aes_key = null;
 544                 $inner_iv = null;
 545
 546                 if ($children->header) {
 547                         $public = true;
 548                         $author_link = str_replace('acct:', '', $children->header->author_id);
 549                 } else {
 550                         // This happens with posts from a relais
 551                         if (empty($privKey)) {
 552                                 Logger::log("This is no private post in the old format", Logger::DEBUG);
 553                                 return false;
 554                         }
 555
 556                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 557
 558                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 559                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 560
 561                         $outer_key_bundle = '';
 562                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 563
 564                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 565
 566                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 567                         $outer_key = base64_decode($j_outer_key_bundle->key);
 568
 569                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 570
 571                         Logger::log('decrypted: '.$decrypted, Logger::DEBUG);
 572                         $idom = XML::parseString($decrypted);
 573
 574                         $inner_iv = base64_decode($idom->iv);
 575                         $inner_aes_key = base64_decode($idom->aes_key);
 576
 577                         $author_link = str_replace('acct:', '', $idom->author_id);
 578                 }
 579
 580                 $dom = $basedom->children(ActivityNamespace::SALMON_ME);
 581
 582                 // figure out where in the DOM tree our data is hiding
 583
 584                 $base = null;
 585                 if ($dom->provenance->data) {
 586                         $base = $dom->provenance;
 587                 } elseif ($dom->env->data) {
 588                         $base = $dom->env;
 589                 } elseif ($dom->data) {
 590                         $base = $dom;
 591                 }
 592
 593                 if (!$base) {
 594                         Logger::log('unable to locate salmon data in xml');
 595                         throw new \Friendica\Network\HTTPException\BadRequestException();
 596                 }
 597
 598
 599                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 600                 $signature = Strings::base64UrlDecode($base->sig);
 601
 602                 // unpack the  data
 603
 604                 // strip whitespace so our data element will return to one big base64 blob
 605                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 606
 607
 608                 // stash away some other stuff for later
 609
 610                 $type = $base->data[0]->attributes()->type[0];
 611                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 612                 $encoding = $base->encoding;
 613                 $alg = $base->alg;
 614
 615
 616                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 617
 618
 619                 // decode the data
 620                 $data = Strings::base64UrlDecode($data);
 621
 622
 623                 if ($public) {
 624                         $inner_decrypted = $data;
 625                 } else {
 626                         // Decode the encrypted blob
 627                         $inner_encrypted = base64_decode($data);
 628                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 629                 }
 630
 631                 if (!$author_link) {
 632                         Logger::log('Could not retrieve author URI.');
 633                         throw new \Friendica\Network\HTTPException\BadRequestException();
 634                 }
 635                 // Once we have the author URI, go to the web and try to find their public key
 636                 // (first this will look it up locally if it is in the fcontact cache)
 637                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 638
 639                 Logger::log('Fetching key for '.$author_link);
 640                 $key = self::key($author_link);
 641
 642                 if (!$key) {
 643                         Logger::log('Could not retrieve author key.');
 644                         throw new \Friendica\Network\HTTPException\BadRequestException();
 645                 }
 646
 647                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 648
 649                 if (!$verify) {
 650                         Logger::log('Message did not verify. Discarding.');
 651                         throw new \Friendica\Network\HTTPException\BadRequestException();
 652                 }
 653
 654                 Logger::log('Message verified.');
 655
 656                 return ['message' => (string)$inner_decrypted,
 657                                 'author' => XML::unescape($author_link),
 658                                 'key' => (string)$key];
 659         }
 660
 661
 662         /**
 663          * @brief Dispatches public messages and find the fitting receivers
 664          *
 665          * @param array $msg The post that will be dispatched
 666          *
 667          * @return int The message id of the generated message, "true" or "false" if there was an error
 668          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 669          * @throws \ImagickException
 670          */
 671         public static function dispatchPublic($msg)
 672         {
 673                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 674                 if (!$enabled) {
 675                         Logger::log("diaspora is disabled");
 676                         return false;
 677                 }
 678
 679                 if (!($fields = self::validPosting($msg))) {
 680                         Logger::log("Invalid posting");
 681                         return false;
 682                 }
 683
 684                 $importer = ["uid" => 0, "page-flags" => User::PAGE_FLAGS_FREELOVE];
 685                 $success = self::dispatch($importer, $msg, $fields);
 686
 687                 return $success;
 688         }
 689
 690         /**
 691          * @brief Dispatches the different message types to the different functions
 692          *
 693          * @param array            $importer Array of the importer user
 694          * @param array            $msg      The post that will be dispatched
 695          * @param SimpleXMLElement $fields   SimpleXML object that contains the message
 696          *
 697          * @return int The message id of the generated message, "true" or "false" if there was an error
 698          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 699          * @throws \ImagickException
 700          */
 701         public static function dispatch(array $importer, $msg, SimpleXMLElement $fields = null)
 702         {
 703                 // The sender is the handle of the contact that sent the message.
 704                 // This will often be different with relayed messages (for example "like" and "comment")
 705                 $sender = $msg["author"];
 706
 707                 // This is only needed for private postings since this is already done for public ones before
 708                 if (is_null($fields)) {
 709                         $private = true;
 710                         if (!($fields = self::validPosting($msg))) {
 711                                 Logger::log("Invalid posting");
 712                                 return false;
 713                         }
 714                 } else {
 715                         $private = false;
 716                 }
 717
 718                 $type = $fields->getName();
 719
 720                 Logger::log("Received message type ".$type." from ".$sender." for user ".$importer["uid"], Logger::DEBUG);
 721
 722                 switch ($type) {
 723                         case "account_migration":
 724                                 if (!$private) {
 725                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 726                                         return false;
 727                                 }
 728                                 return self::receiveAccountMigration($importer, $fields);
 729
 730                         case "account_deletion":
 731                                 return self::receiveAccountDeletion($fields);
 732
 733                         case "comment":
 734                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 735
 736                         case "contact":
 737                                 if (!$private) {
 738                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 739                                         return false;
 740                                 }
 741                                 return self::receiveContactRequest($importer, $fields);
 742
 743                         case "conversation":
 744                                 if (!$private) {
 745                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 746                                         return false;
 747                                 }
 748                                 return self::receiveConversation($importer, $msg, $fields);
 749
 750                         case "like":
 751                                 return self::receiveLike($importer, $sender, $fields);
 752
 753                         case "message":
 754                                 if (!$private) {
 755                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 756                                         return false;
 757                                 }
 758                                 return self::receiveMessage($importer, $fields);
 759
 760                         case "participation":
 761                                 if (!$private) {
 762                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 763                                         return false;
 764                                 }
 765                                 return self::receiveParticipation($importer, $fields);
 766
 767                         case "photo": // Not implemented
 768                                 return self::receivePhoto($importer, $fields);
 769
 770                         case "poll_participation": // Not implemented
 771                                 return self::receivePollParticipation($importer, $fields);
 772
 773                         case "profile":
 774                                 if (!$private) {
 775                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 776                                         return false;
 777                                 }
 778                                 return self::receiveProfile($importer, $fields);
 779
 780                         case "reshare":
 781                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 782
 783                         case "retraction":
 784                                 return self::receiveRetraction($importer, $sender, $fields);
 785
 786                         case "status_message":
 787                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 788
 789                         default:
 790                                 Logger::log("Unknown message type ".$type);
 791                                 return false;
 792                 }
 793         }
 794
 795         /**
 796          * @brief Checks if a posting is valid and fetches the data fields.
 797          *
 798          * This function does not only check the signature.
 799          * It also does the conversion between the old and the new diaspora format.
 800          *
 801          * @param array $msg Array with the XML, the sender handle and the sender signature
 802          *
 803          * @return bool|SimpleXMLElement If the posting is valid then an array with an SimpleXML object is returned
 804          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 805          * @throws \ImagickException
 806          */
 807         private static function validPosting($msg)
 808         {
 809                 $data = XML::parseString($msg["message"]);
 810
 811                 if (!is_object($data)) {
 812                         Logger::log("No valid XML ".$msg["message"], Logger::DEBUG);
 813                         return false;
 814                 }
 815
 816                 // Is this the new or the old version?
 817                 if ($data->getName() == "XML") {
 818                         $oldXML = true;
 819                         foreach ($data->post->children() as $child) {
 820                                 $element = $child;
 821                         }
 822                 } else {
 823                         $oldXML = false;
 824                         $element = $data;
 825                 }
 826
 827                 $type = $element->getName();
 828                 $orig_type = $type;
 829
 830                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 831
 832                 // All retractions are handled identically from now on.
 833                 // In the new version there will only be "retraction".
 834                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 835                         $type = "retraction";
 836
 837                 if ($type == "request") {
 838                         $type = "contact";
 839                 }
 840
 841                 $fields = new SimpleXMLElement("<".$type."/>");
 842
 843                 $signed_data = "";
 844                 $author_signature = null;
 845                 $parent_author_signature = null;
 846
 847                 foreach ($element->children() as $fieldname => $entry) {
 848                         if ($oldXML) {
 849                                 // Translation for the old XML structure
 850                                 if ($fieldname == "diaspora_handle") {
 851                                         $fieldname = "author";
 852                                 }
 853                                 if ($fieldname == "participant_handles") {
 854                                         $fieldname = "participants";
 855                                 }
 856                                 if (in_array($type, ["like", "participation"])) {
 857                                         if ($fieldname == "target_type") {
 858                                                 $fieldname = "parent_type";
 859                                         }
 860                                 }
 861                                 if ($fieldname == "sender_handle") {
 862                                         $fieldname = "author";
 863                                 }
 864                                 if ($fieldname == "recipient_handle") {
 865                                         $fieldname = "recipient";
 866                                 }
 867                                 if ($fieldname == "root_diaspora_id") {
 868                                         $fieldname = "root_author";
 869                                 }
 870                                 if ($type == "status_message") {
 871                                         if ($fieldname == "raw_message") {
 872                                                 $fieldname = "text";
 873                                         }
 874                                 }
 875                                 if ($type == "retraction") {
 876                                         if ($fieldname == "post_guid") {
 877                                                 $fieldname = "target_guid";
 878                                         }
 879                                         if ($fieldname == "type") {
 880                                                 $fieldname = "target_type";
 881                                         }
 882                                 }
 883                         }
 884
 885                         if (($fieldname == "author_signature") && ($entry != "")) {
 886                                 $author_signature = base64_decode($entry);
 887                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 888                                 $parent_author_signature = base64_decode($entry);
 889                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 890                                 if ($signed_data != "") {
 891                                         $signed_data .= ";";
 892                                 }
 893
 894                                 $signed_data .= $entry;
 895                         }
 896                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 897                                 || ($orig_type == "relayable_retraction")
 898                         ) {
 899                                 XML::copy($entry, $fields, $fieldname);
 900                         }
 901                 }
 902
 903                 // This is something that shouldn't happen at all.
 904                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 905                         if ($msg["author"] != $fields->author) {
 906                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 907                                 return false;
 908                         }
 909                 }
 910
 911                 // Only some message types have signatures. So we quit here for the other types.
 912                 if (!in_array($type, ["comment", "like"])) {
 913                         return $fields;
 914                 }
 915                 // No author_signature? This is a must, so we quit.
 916                 if (!isset($author_signature)) {
 917                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 918                         return false;
 919                 }
 920
 921                 if (isset($parent_author_signature)) {
 922                         $key = self::key($msg["author"]);
 923                         if (empty($key)) {
 924                                 Logger::log("No key found for parent author ".$msg["author"], Logger::DEBUG);
 925                                 return false;
 926                         }
 927
 928                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 929                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 930                                 return false;
 931                         }
 932                 }
 933
 934                 $key = self::key($fields->author);
 935                 if (empty($key)) {
 936                         Logger::log("No key found for author ".$fields->author, Logger::DEBUG);
 937                         return false;
 938                 }
 939
 940                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 941                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 942                         return false;
 943                 } else {
 944                         return $fields;
 945                 }
 946         }
 947
 948         /**
 949          * @brief Fetches the public key for a given handle
 950          *
 951          * @param string $handle The handle
 952          *
 953          * @return string The public key
 954          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 955          * @throws \ImagickException
 956          */
 957         private static function key($handle)
 958         {
 959                 $handle = strval($handle);
 960
 961                 Logger::log("Fetching diaspora key for: ".$handle);
 962
 963                 $r = self::personByHandle($handle);
 964                 if ($r) {
 965                         return $r["pubkey"];
 966                 }
 967
 968                 return "";
 969         }
 970
 971         /**
 972          * @brief Fetches data for a given handle
 973          *
 974          * @param string $handle The handle
 975          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
 976          *
 977          * @return array the queried data
 978          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 979          * @throws \ImagickException
 980          */
 981         public static function personByHandle($handle, $update = null)
 982         {
 983                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 984                 if (!DBA::isResult($person)) {
 985                         $urls = [$handle, str_replace('http://', 'https://', $handle), Strings::normaliseLink($handle)];
 986                         $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'url' => $urls]);
 987                 }
 988
 989                 if (DBA::isResult($person)) {
 990                         Logger::debug("In cache " . print_r($person, true));
 991
 992                         if (is_null($update)) {
 993                                 // update record occasionally so it doesn't get stale
 994                                 $d = strtotime($person["updated"]." +00:00");
 995                                 if ($d < strtotime("now - 14 days")) {
 996                                         $update = true;
 997                                 }
 998
 999                                 if ($person["guid"] == "") {
1000                                         $update = true;
1001                                 }
1002                         }
1003                 } elseif (is_null($update)) {
1004                         $update = !DBA::isResult($person);
1005                 } else {
1006                         $person = [];
1007                 }
1008
1009                 if ($update) {
1010                         Logger::log("create or refresh", Logger::DEBUG);
1011                         $r = Probe::uri($handle, Protocol::DIASPORA);
1012
1013                         // Note that Friendica contacts will return a "Diaspora person"
1014                         // if Diaspora connectivity is enabled on their server
1015                         if ($r && ($r["network"] === Protocol::DIASPORA)) {
1016                                 self::updateFContact($r);
1017
1018                                 $person = self::personByHandle($handle, false);
1019                         }
1020                 }
1021
1022                 return $person;
1023         }
1024
1025         /**
1026          * @brief Updates the fcontact table
1027          *
1028          * @param array $arr The fcontact data
1029          * @throws \Exception
1030          */
1031         private static function updateFContact($arr)
1032         {
1033                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
1034                         'request' => $arr["request"], 'nick' => $arr["nick"],
1035                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
1036                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
1037                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
1038                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
1039                         'updated' => DateTimeFormat::utcNow()];
1040
1041                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
1042
1043                 DBA::update('fcontact', $fields, $condition, true);
1044         }
1045
1046         /**
1047          * @brief get a handle (user@domain.tld) from a given contact id
1048          *
1049          * @param int $contact_id  The id in the contact table
1050          * @param int $pcontact_id The id in the contact table (Used for the public contact)
1051          *
1052          * @return string the handle
1053          * @throws \Exception
1054          */
1055         private static function handleFromContact($contact_id, $pcontact_id = 0)
1056         {
1057                 $handle = false;
1058
1059                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
1060
1061                 if ($pcontact_id != 0) {
1062                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
1063
1064                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
1065                                 return strtolower($contact["addr"]);
1066                         }
1067                 }
1068
1069                 $r = q(
1070                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1071                         intval($contact_id)
1072                 );
1073
1074                 if (DBA::isResult($r)) {
1075                         $contact = $r[0];
1076
1077                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
1078
1079                         if ($contact['addr'] != "") {
1080                                 $handle = $contact['addr'];
1081                         } else {
1082                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1083                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1084                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1085                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1086                                 $handle = $contact['nick'].'@'.$baseurl;
1087                         }
1088                 }
1089
1090                 return strtolower($handle);
1091         }
1092
1093         /**
1094          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1095          * fcontact guid
1096          *
1097          * @param mixed $fcontact_guid Hexadecimal string guid
1098          *
1099          * @return string the contact url or null
1100          * @throws \Exception
1101          */
1102         public static function urlFromContactGuid($fcontact_guid)
1103         {
1104                 Logger::log("fcontact guid is ".$fcontact_guid, Logger::DEBUG);
1105
1106                 $r = q(
1107                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1108                         DBA::escape(Protocol::DIASPORA),
1109                         DBA::escape($fcontact_guid)
1110                 );
1111
1112                 if (DBA::isResult($r)) {
1113                         return $r[0]['url'];
1114                 }
1115
1116                 return null;
1117         }
1118
1119         /**
1120          * @brief Get a contact id for a given handle
1121          *
1122          * @todo  Move to Friendica\Model\Contact
1123          *
1124          * @param int    $uid    The user id
1125          * @param string $handle The handle in the format user@domain.tld
1126          *
1127          * @return array Contact data
1128          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1129          * @throws \ImagickException
1130          */
1131         private static function contactByHandle($uid, $handle)
1132         {
1133                 $cid = Contact::getIdForURL($handle, $uid);
1134                 if (!$cid) {
1135                         $handle_parts = explode("@", $handle);
1136                         $nurl_sql = "%%://" . $handle_parts[1] . "%%/profile/" . $handle_parts[0];
1137                         $cid = Contact::getIdForURL($nurl_sql, $uid);
1138                 }
1139
1140                 if (!$cid) {
1141                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1142                         return false;
1143                 }
1144
1145                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1146                 if (!DBA::isResult($contact)) {
1147                         // This here shouldn't happen at all
1148                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1149                         return false;
1150                 }
1151
1152                 return $contact;
1153         }
1154
1155         /**
1156          * Checks if the given contact url does support ActivityPub
1157          *
1158          * @param string  $url    profile url
1159          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
1160          * @return boolean
1161          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1162          * @throws \ImagickException
1163          */
1164         public static function isSupportedByContactUrl($url, $update = null)
1165         {
1166                 return !empty(self::personByHandle($url, $update));
1167         }
1168
1169         /**
1170          * @brief Check if posting is allowed for this contact
1171          *
1172          * @param array $importer   Array of the importer user
1173          * @param array $contact    The contact that is checked
1174          * @param bool  $is_comment Is the check for a comment?
1175          *
1176          * @return bool is the contact allowed to post?
1177          */
1178         private static function postAllow(array $importer, array $contact, $is_comment = false)
1179         {
1180                 /*
1181                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1182                  * That makes us friends.
1183                  * Normally this should have handled by getting a request - but this could get lost
1184                  */
1185                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1186                 // It is not removed by now. Possibly the code is needed?
1187                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(User::PAGE_FLAGS_FREELOVE))) {
1188                 //      DBA::update(
1189                 //              'contact',
1190                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1191                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1192                 //      );
1193                 //
1194                 //      $contact["rel"] = Contact::FRIEND;
1195                 //      Logger::log("defining user ".$contact["nick"]." as friend");
1196                 //}
1197
1198                 // Contact server is blocked
1199                 if (Network::isUrlBlocked($contact['url'])) {
1200                         return false;
1201                         // We don't seem to like that person
1202                 } elseif ($contact["blocked"]) {
1203                         // Maybe blocked, don't accept.
1204                         return false;
1205                         // We are following this person?
1206                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1207                         // Yes, then it is fine.
1208                         return true;
1209                         // Is it a post to a community?
1210                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
1211                         // That's good
1212                         return true;
1213                         // Is the message a global user or a comment?
1214                 } elseif (($importer["uid"] == 0) || $is_comment) {
1215                         // Messages for the global users and comments are always accepted
1216                         return true;
1217                 }
1218
1219                 return false;
1220         }
1221
1222         /**
1223          * @brief Fetches the contact id for a handle and checks if posting is allowed
1224          *
1225          * @param array  $importer   Array of the importer user
1226          * @param string $handle     The checked handle in the format user@domain.tld
1227          * @param bool   $is_comment Is the check for a comment?
1228          *
1229          * @return array The contact data
1230          * @throws \Exception
1231          */
1232         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
1233         {
1234                 $contact = self::contactByHandle($importer["uid"], $handle);
1235                 if (!$contact) {
1236                         Logger::log("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1237                         // If a contact isn't found, we accept it anyway if it is a comment
1238                         if ($is_comment && ($importer["uid"] != 0)) {
1239                                 return self::contactByHandle(0, $handle);
1240                         } elseif ($is_comment) {
1241                                 return $importer;
1242                         } else {
1243                                 return false;
1244                         }
1245                 }
1246
1247                 if (!self::postAllow($importer, $contact, $is_comment)) {
1248                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1249                         return false;
1250                 }
1251                 return $contact;
1252         }
1253
1254         /**
1255          * @brief Does the message already exists on the system?
1256          *
1257          * @param int    $uid  The user id
1258          * @param string $guid The guid of the message
1259          *
1260          * @return int|bool message id if the message already was stored into the system - or false.
1261          * @throws \Exception
1262          */
1263         private static function messageExists($uid, $guid)
1264         {
1265                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1266                 if (DBA::isResult($item)) {
1267                         Logger::log("message ".$guid." already exists for user ".$uid);
1268                         return $item["id"];
1269                 }
1270
1271                 return false;
1272         }
1273
1274         /**
1275          * @brief Checks for links to posts in a message
1276          *
1277          * @param array $item The item array
1278          * @return void
1279          */
1280         private static function fetchGuid(array $item)
1281         {
1282                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1283                 preg_replace_callback(
1284                         $expression,
1285                         function ($match) use ($item) {
1286                                 self::fetchGuidSub($match, $item);
1287                         },
1288                         $item["body"]
1289                 );
1290
1291                 preg_replace_callback(
1292                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1293                         function ($match) use ($item) {
1294                                 self::fetchGuidSub($match, $item);
1295                         },
1296                         $item["body"]
1297                 );
1298         }
1299
1300         /**
1301          * @brief Checks for relative /people/* links in an item body to match local
1302          * contacts or prepends the remote host taken from the author link.
1303          *
1304          * @param string $body        The item body to replace links from
1305          * @param string $author_link The author link for missing local contact fallback
1306          *
1307          * @return string the replaced string
1308          */
1309         public static function replacePeopleGuid($body, $author_link)
1310         {
1311                 $return = preg_replace_callback(
1312                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1313                         function ($match) use ($author_link) {
1314                                 // $match
1315                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1316                                 // 1 => '0123456789abcdef'
1317                                 // 2 => 'Foo Bar'
1318                                 $handle = self::urlFromContactGuid($match[1]);
1319
1320                                 if ($handle) {
1321                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1322                                 } else {
1323                                         // No local match, restoring absolute remote URL from author scheme and host
1324                                         $author_url = parse_url($author_link);
1325                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1326                                 }
1327
1328                                 return $return;
1329                         },
1330                         $body
1331                 );
1332
1333                 return $return;
1334         }
1335
1336         /**
1337          * @brief sub function of "fetchGuid" which checks for links in messages
1338          *
1339          * @param array $match array containing a link that has to be checked for a message link
1340          * @param array $item  The item array
1341          * @return void
1342          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1343          * @throws \ImagickException
1344          */
1345         private static function fetchGuidSub($match, $item)
1346         {
1347                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1348                         self::storeByGuid($match[1], $item["owner-link"]);
1349                 }
1350         }
1351
1352         /**
1353          * @brief Fetches an item with a given guid from a given server
1354          *
1355          * @param string $guid   the message guid
1356          * @param string $server The server address
1357          * @param int    $uid    The user id of the user
1358          *
1359          * @return int the message id of the stored message or false
1360          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1361          * @throws \ImagickException
1362          */
1363         private static function storeByGuid($guid, $server, $uid = 0)
1364         {
1365                 $serverparts = parse_url($server);
1366
1367                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1368                         return false;
1369                 }
1370
1371                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1372
1373                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1374
1375                 $msg = self::message($guid, $server);
1376
1377                 if (!$msg) {
1378                         return false;
1379                 }
1380
1381                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1382
1383                 // Now call the dispatcher
1384                 return self::dispatchPublic($msg);
1385         }
1386
1387         /**
1388          * @brief Fetches a message from a server
1389          *
1390          * @param string $guid   message guid
1391          * @param string $server The url of the server
1392          * @param int    $level  Endless loop prevention
1393          *
1394          * @return array
1395          *      'message' => The message XML
1396          *      'author' => The author handle
1397          *      'key' => The public key of the author
1398          * @throws \Exception
1399          */
1400         private static function message($guid, $server, $level = 0)
1401         {
1402                 if ($level > 5) {
1403                         return false;
1404                 }
1405
1406                 // This will work for new Diaspora servers and Friendica servers from 3.5
1407                 $source_url = $server."/fetch/post/".urlencode($guid);
1408
1409                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1410
1411                 $envelope = Network::fetchUrl($source_url);
1412                 if ($envelope) {
1413                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1414                         $x = self::verifyMagicEnvelope($envelope);
1415                         if (!$x) {
1416                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1417                         } else {
1418                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1419                         }
1420                 } else {
1421                         $x = false;
1422                 }
1423
1424                 if (!$x) {
1425                         return false;
1426                 }
1427
1428                 $source_xml = XML::parseString($x);
1429
1430                 if (!is_object($source_xml)) {
1431                         return false;
1432                 }
1433
1434                 if ($source_xml->post->reshare) {
1435                         // Reshare of a reshare - old Diaspora version
1436                         Logger::log("Message is a reshare", Logger::DEBUG);
1437                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1438                 } elseif ($source_xml->getName() == "reshare") {
1439                         // Reshare of a reshare - new Diaspora version
1440                         Logger::log("Message is a new reshare", Logger::DEBUG);
1441                         return self::message($source_xml->root_guid, $server, ++$level);
1442                 }
1443
1444                 $author = "";
1445
1446                 // Fetch the author - for the old and the new Diaspora version
1447                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1448                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1449                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1450                         $author = (string)$source_xml->author;
1451                 }
1452
1453                 // If this isn't a "status_message" then quit
1454                 if (!$author) {
1455                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1456                         return false;
1457                 }
1458
1459                 $msg = ["message" => $x, "author" => $author];
1460
1461                 $msg["key"] = self::key($msg["author"]);
1462
1463                 return $msg;
1464         }
1465
1466         /**
1467          * @brief Fetches an item with a given URL
1468          *
1469          * @param string $url the message url
1470          *
1471          * @return int the message id of the stored message or false
1472          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1473          * @throws \ImagickException
1474          */
1475         public static function fetchByURL($url, $uid = 0)
1476         {
1477                 // Check for Diaspora (and Friendica) typical paths
1478                 if (!preg_match("=(https?://.+)/(?:posts|display)/([a-zA-Z0-9-_@.:%]+[a-zA-Z0-9])=i", $url, $matches)) {
1479                         return false;
1480                 }
1481
1482                 $guid = urldecode($matches[2]);
1483
1484                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1485                 if (DBA::isResult($item)) {
1486                         return $item['id'];
1487                 }
1488
1489                 self::storeByGuid($guid, $matches[1], $uid);
1490
1491                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1492                 if (DBA::isResult($item)) {
1493                         return $item['id'];
1494                 } else {
1495                         return false;
1496                 }
1497         }
1498
1499         /**
1500          * @brief Fetches the item record of a given guid
1501          *
1502          * @param int    $uid     The user id
1503          * @param string $guid    message guid
1504          * @param string $author  The handle of the item
1505          * @param array  $contact The contact of the item owner
1506          *
1507          * @return array the item record
1508          * @throws \Exception
1509          */
1510         private static function parentItem($uid, $guid, $author, array $contact)
1511         {
1512                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1513                         'author-name', 'author-link', 'author-avatar',
1514                         'owner-name', 'owner-link', 'owner-avatar'];
1515                 $condition = ['uid' => $uid, 'guid' => $guid];
1516                 $item = Item::selectFirst($fields, $condition);
1517
1518                 if (!DBA::isResult($item)) {
1519                         $person = self::personByHandle($author);
1520                         $result = self::storeByGuid($guid, $person["url"], $uid);
1521
1522                         // We don't have an url for items that arrived at the public dispatcher
1523                         if (!$result && !empty($contact["url"])) {
1524                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1525                         }
1526
1527                         if ($result) {
1528                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1529
1530                                 $item = Item::selectFirst($fields, $condition);
1531                         }
1532                 }
1533
1534                 if (!DBA::isResult($item)) {
1535                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1536                         return false;
1537                 } else {
1538                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1539                         return $item;
1540                 }
1541         }
1542
1543         /**
1544          * @brief returns contact details
1545          *
1546          * @param array $def_contact The default contact if the person isn't found
1547          * @param array $person      The record of the person
1548          * @param int   $uid         The user id
1549          *
1550          * @return array
1551          *      'cid' => contact id
1552          *      'network' => network type
1553          * @throws \Exception
1554          */
1555         private static function authorContactByUrl($def_contact, $person, $uid)
1556         {
1557                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1558                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1559                 if (DBA::isResult($contact)) {
1560                         $cid = $contact["id"];
1561                         $network = $contact["network"];
1562                 } else {
1563                         $cid = $def_contact["id"];
1564                         $network = Protocol::DIASPORA;
1565                 }
1566
1567                 return ["cid" => $cid, "network" => $network];
1568         }
1569
1570         /**
1571          * @brief Is the profile a hubzilla profile?
1572          *
1573          * @param string $url The profile link
1574          *
1575          * @return bool is it a hubzilla server?
1576          */
1577         public static function isRedmatrix($url)
1578         {
1579                 return(strstr($url, "/channel/"));
1580         }
1581
1582         /**
1583          * @brief Generate a post link with a given handle and message guid
1584          *
1585          * @param string $addr        The user handle
1586          * @param string $guid        message guid
1587          * @param string $parent_guid optional parent guid
1588          *
1589          * @return string the post link
1590          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1591          * @throws \ImagickException
1592          */
1593         private static function plink($addr, $guid, $parent_guid = '')
1594         {
1595                 $contact = Contact::getDetailsByAddr($addr);
1596
1597                 // Fallback
1598                 if (!$contact) {
1599                         if ($parent_guid != '') {
1600                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1601                         } else {
1602                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1603                         }
1604                 }
1605
1606                 if ($contact["network"] == Protocol::DFRN) {
1607                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1608                 }
1609
1610                 if (self::isRedmatrix($contact["url"])) {
1611                         return $contact["url"] . "/?mid=" . $guid;
1612                 }
1613
1614                 if ($parent_guid != '') {
1615                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1616                 } else {
1617                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1618                 }
1619         }
1620
1621         /**
1622          * @brief Receives account migration
1623          *
1624          * @param array  $importer Array of the importer user
1625          * @param object $data     The message object
1626          *
1627          * @return bool Success
1628          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1629          * @throws \ImagickException
1630          */
1631         private static function receiveAccountMigration(array $importer, $data)
1632         {
1633                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1634                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1635                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1636
1637                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1638                 if (!$contact) {
1639                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1640                         return false;
1641                 }
1642
1643                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1644
1645                 // Check signature
1646                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1647                 $key = self::key($old_handle);
1648                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1649                         Logger::log('No valid signature for migration.');
1650                         return false;
1651                 }
1652
1653                 // Update the profile
1654                 self::receiveProfile($importer, $data->profile);
1655
1656                 // change the technical stuff in contact and gcontact
1657                 $data = Probe::uri($new_handle);
1658                 if ($data['network'] == Protocol::PHANTOM) {
1659                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1660                         return false;
1661                 }
1662
1663                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1664                                 'name' => $data['name'], 'nick' => $data['nick'],
1665                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1666                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1667                                 'network' => $data['network']];
1668
1669                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1670
1671                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1672                                 'name' => $data['name'], 'nick' => $data['nick'],
1673                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1674                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1675                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1676
1677                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1678
1679                 Logger::log('Contacts are updated.');
1680
1681                 return true;
1682         }
1683
1684         /**
1685          * @brief Processes an account deletion
1686          *
1687          * @param object $data The message object
1688          *
1689          * @return bool Success
1690          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1691          */
1692         private static function receiveAccountDeletion($data)
1693         {
1694                 $author = Strings::escapeTags(XML::unescape($data->author));
1695
1696                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1697                 while ($contact = DBA::fetch($contacts)) {
1698                         Contact::remove($contact["id"]);
1699                 }
1700
1701                 DBA::delete('gcontact', ['addr' => $author]);
1702
1703                 Logger::log('Removed contacts for ' . $author);
1704
1705                 return true;
1706         }
1707
1708         /**
1709          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1710          *
1711          * @param string  $author    Author handle
1712          * @param string  $guid      Message guid
1713          * @param boolean $onlyfound Only return uri when found in the database
1714          *
1715          * @return string The constructed uri or the one from our database
1716          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1717          * @throws \ImagickException
1718          */
1719         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1720         {
1721                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1722                 if (DBA::isResult($item)) {
1723                         return $item["uri"];
1724                 } elseif (!$onlyfound) {
1725                         $person = self::personByHandle($author);
1726
1727                         $parts = parse_url($person['url']);
1728                         unset($parts['path']);
1729                         $host_url = Network::unparseURL($parts);
1730
1731                         return $host_url . '/objects/' . $guid;
1732                 }
1733
1734                 return "";
1735         }
1736
1737         /**
1738          * @brief Fetch the guid from our database with a given uri
1739          *
1740          * @param string $uri Message uri
1741          * @param string $uid Author handle
1742          *
1743          * @return string The post guid
1744          * @throws \Exception
1745          */
1746         private static function getGuidFromUri($uri, $uid)
1747         {
1748                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1749                 if (DBA::isResult($item)) {
1750                         return $item["guid"];
1751                 } else {
1752                         return false;
1753                 }
1754         }
1755
1756         /**
1757          * @brief Find the best importer for a comment, like, ...
1758          *
1759          * @param string $guid The guid of the item
1760          *
1761          * @return array|boolean the origin owner of that post - or false
1762          * @throws \Exception
1763          */
1764         private static function importerForGuid($guid)
1765         {
1766                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1767                 if (DBA::isResult($item)) {
1768                         Logger::log("Found user ".$item['uid']." as owner of item ".$guid, Logger::DEBUG);
1769                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1770                         if (DBA::isResult($contact)) {
1771                                 return $contact;
1772                         }
1773                 }
1774                 return false;
1775         }
1776
1777         /**
1778          * @brief Processes an incoming comment
1779          *
1780          * @param array  $importer Array of the importer user
1781          * @param string $sender   The sender of the message
1782          * @param object $data     The message object
1783          * @param string $xml      The original XML of the message
1784          *
1785          * @return int The message id of the generated comment or "false" if there was an error
1786          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1787          * @throws \ImagickException
1788          */
1789         private static function receiveComment(array $importer, $sender, $data, $xml)
1790         {
1791                 $author = Strings::escapeTags(XML::unescape($data->author));
1792                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1793                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1794                 $text = XML::unescape($data->text);
1795
1796                 if (isset($data->created_at)) {
1797                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1798                 } else {
1799                         $created_at = DateTimeFormat::utcNow();
1800                 }
1801
1802                 if (isset($data->thread_parent_guid)) {
1803                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1804                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1805                 } else {
1806                         $thr_uri = "";
1807                 }
1808
1809                 $contact = self::allowedContactByHandle($importer, $sender, true);
1810                 if (!$contact) {
1811                         return false;
1812                 }
1813
1814                 $message_id = self::messageExists($importer["uid"], $guid);
1815                 if ($message_id) {
1816                         return true;
1817                 }
1818
1819                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1820                 if (!$parent_item) {
1821                         return false;
1822                 }
1823
1824                 $person = self::personByHandle($author);
1825                 if (!is_array($person)) {
1826                         Logger::log("unable to find author details");
1827                         return false;
1828                 }
1829
1830                 // Fetch the contact id - if we know this contact
1831                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1832
1833                 $datarray = [];
1834
1835                 $datarray["uid"] = $importer["uid"];
1836                 $datarray["contact-id"] = $author_contact["cid"];
1837                 $datarray["network"]  = $author_contact["network"];
1838
1839                 $datarray["author-link"] = $person["url"];
1840                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1841
1842                 $datarray["owner-link"] = $contact["url"];
1843                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1844
1845                 $datarray["guid"] = $guid;
1846                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1847
1848                 $datarray["verb"] = Activity::POST;
1849                 $datarray["gravity"] = GRAVITY_COMMENT;
1850
1851                 if ($thr_uri != "") {
1852                         $datarray["parent-uri"] = $thr_uri;
1853                 } else {
1854                         $datarray["parent-uri"] = $parent_item["uri"];
1855                 }
1856
1857                 $datarray["object-type"] = Activity\ObjectType::COMMENT;
1858
1859                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1860                 $datarray["source"] = $xml;
1861
1862                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1863
1864                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1865
1866                 $body = Markdown::toBBCode($text);
1867
1868                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1869
1870                 self::fetchGuid($datarray);
1871
1872                 // If we are the origin of the parent we store the original data.
1873                 // We notify our followers during the item storage.
1874                 if ($parent_item["origin"]) {
1875                         $datarray['diaspora_signed_text'] = json_encode($data);
1876                 }
1877
1878                 $message_id = Item::insert($datarray);
1879
1880                 if ($message_id <= 0) {
1881                         return false;
1882                 }
1883
1884                 if ($message_id) {
1885                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1886                         if ($datarray['uid'] == 0) {
1887                                 Item::distribute($message_id, json_encode($data));
1888                         }
1889                 }
1890
1891                 return true;
1892         }
1893
1894         /**
1895          * @brief processes and stores private messages
1896          *
1897          * @param array  $importer     Array of the importer user
1898          * @param array  $contact      The contact of the message
1899          * @param object $data         The message object
1900          * @param array  $msg          Array of the processed message, author handle and key
1901          * @param object $mesg         The private message
1902          * @param array  $conversation The conversation record to which this message belongs
1903          *
1904          * @return bool "true" if it was successful
1905          * @throws \Exception
1906          */
1907         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1908         {
1909                 $author = Strings::escapeTags(XML::unescape($data->author));
1910                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1911                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1912
1913                 // "diaspora_handle" is the element name from the old version
1914                 // "author" is the element name from the new version
1915                 if ($mesg->author) {
1916                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1917                 } elseif ($mesg->diaspora_handle) {
1918                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1919                 } else {
1920                         return false;
1921                 }
1922
1923                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1924                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1925                 $msg_text = XML::unescape($mesg->text);
1926                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1927
1928                 if ($msg_conversation_guid != $guid) {
1929                         Logger::log("message conversation guid does not belong to the current conversation.");
1930                         return false;
1931                 }
1932
1933                 $body = Markdown::toBBCode($msg_text);
1934                 $message_uri = $msg_author.":".$msg_guid;
1935
1936                 $person = self::personByHandle($msg_author);
1937
1938                 return Mail::insert([
1939                         'uid'        => $importer['uid'],
1940                         'guid'       => $msg_guid,
1941                         'convid'     => $conversation['id'],
1942                         'from-name'  => $person['name'],
1943                         'from-photo' => $person['photo'],
1944                         'from-url'   => $person['url'],
1945                         'contact-id' => $contact['id'],
1946                         'title'      => $subject,
1947                         'body'       => $body,
1948                         'uri'        => $message_uri,
1949                         'parent-uri' => $author . ':' . $guid,
1950                         'created'    => $msg_created_at
1951                 ]);
1952         }
1953
1954         /**
1955          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1956          *
1957          * @param array  $importer Array of the importer user
1958          * @param array  $msg      Array of the processed message, author handle and key
1959          * @param object $data     The message object
1960          *
1961          * @return bool Success
1962          * @throws \Exception
1963          */
1964         private static function receiveConversation(array $importer, $msg, $data)
1965         {
1966                 $author = Strings::escapeTags(XML::unescape($data->author));
1967                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1968                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1969                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1970                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1971
1972                 $messages = $data->message;
1973
1974                 if (!count($messages)) {
1975                         Logger::log("empty conversation");
1976                         return false;
1977                 }
1978
1979                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1980                 if (!$contact) {
1981                         return false;
1982                 }
1983
1984                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1985                 if (!DBA::isResult($conversation)) {
1986                         $r = q(
1987                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1988                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1989                                 intval($importer["uid"]),
1990                                 DBA::escape($guid),
1991                                 DBA::escape($author),
1992                                 DBA::escape($created_at),
1993                                 DBA::escape(DateTimeFormat::utcNow()),
1994                                 DBA::escape($subject),
1995                                 DBA::escape($participants)
1996                         );
1997                         if ($r) {
1998                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1999                         }
2000                 }
2001                 if (!$conversation) {
2002                         Logger::log("unable to create conversation.");
2003                         return false;
2004                 }
2005
2006                 foreach ($messages as $mesg) {
2007                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
2008                 }
2009
2010                 return true;
2011         }
2012
2013         /**
2014          * @brief Processes "like" messages
2015          *
2016          * @param array  $importer Array of the importer user
2017          * @param string $sender   The sender of the message
2018          * @param object $data     The message object
2019          *
2020          * @return int The message id of the generated like or "false" if there was an error
2021          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2022          * @throws \ImagickException
2023          */
2024         private static function receiveLike(array $importer, $sender, $data)
2025         {
2026                 $author = Strings::escapeTags(XML::unescape($data->author));
2027                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2028                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2029                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
2030                 $positive = Strings::escapeTags(XML::unescape($data->positive));
2031
2032                 // likes on comments aren't supported by Diaspora - only on posts
2033                 // But maybe this will be supported in the future, so we will accept it.
2034                 if (!in_array($parent_type, ["Post", "Comment"])) {
2035                         return false;
2036                 }
2037
2038                 $contact = self::allowedContactByHandle($importer, $sender, true);
2039                 if (!$contact) {
2040                         return false;
2041                 }
2042
2043                 $message_id = self::messageExists($importer["uid"], $guid);
2044                 if ($message_id) {
2045                         return true;
2046                 }
2047
2048                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
2049                 if (!$parent_item) {
2050                         return false;
2051                 }
2052
2053                 $person = self::personByHandle($author);
2054                 if (!is_array($person)) {
2055                         Logger::log("unable to find author details");
2056                         return false;
2057                 }
2058
2059                 // Fetch the contact id - if we know this contact
2060                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2061
2062                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2063                 // We would accept this anyhow.
2064                 if ($positive == "true") {
2065                         $verb = Activity::LIKE;
2066                 } else {
2067                         $verb = Activity::DISLIKE;
2068                 }
2069
2070                 $datarray = [];
2071
2072                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2073
2074                 $datarray["uid"] = $importer["uid"];
2075                 $datarray["contact-id"] = $author_contact["cid"];
2076                 $datarray["network"]  = $author_contact["network"];
2077
2078                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
2079                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
2080
2081                 $datarray["guid"] = $guid;
2082                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2083
2084                 $datarray["verb"] = $verb;
2085                 $datarray["gravity"] = GRAVITY_ACTIVITY;
2086                 $datarray["parent-uri"] = $parent_item["uri"];
2087
2088                 $datarray["object-type"] = Activity\ObjectType::NOTE;
2089
2090                 $datarray["body"] = $verb;
2091
2092                 // Diaspora doesn't provide a date for likes
2093                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
2094
2095                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2096                 if ($parent_item["id"] != $parent_item["parent"]) {
2097                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item["parent"]]);
2098                         $origin = $toplevel["origin"];
2099                 } else {
2100                         $origin = $parent_item["origin"];
2101                 }
2102
2103                 // If we are the origin of the parent we store the original data.
2104                 // We notify our followers during the item storage.
2105                 if ($origin) {
2106                         $datarray['diaspora_signed_text'] = json_encode($data);
2107                 }
2108
2109                 $message_id = Item::insert($datarray);
2110
2111                 if ($message_id <= 0) {
2112                         return false;
2113                 }
2114
2115                 if ($message_id) {
2116                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2117                         if ($datarray['uid'] == 0) {
2118                                 Item::distribute($message_id, json_encode($data));
2119                         }
2120                 }
2121
2122                 return true;
2123         }
2124
2125         /**
2126          * @brief Processes private messages
2127          *
2128          * @param array  $importer Array of the importer user
2129          * @param object $data     The message object
2130          *
2131          * @return bool Success?
2132          * @throws \Exception
2133          */
2134         private static function receiveMessage(array $importer, $data)
2135         {
2136                 $author = Strings::escapeTags(XML::unescape($data->author));
2137                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2138                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
2139                 $text = XML::unescape($data->text);
2140                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2141
2142                 $contact = self::allowedContactByHandle($importer, $author, true);
2143                 if (!$contact) {
2144                         return false;
2145                 }
2146
2147                 $conversation = null;
2148
2149                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
2150                 $conversation = DBA::selectFirst('conv', [], $condition);
2151
2152                 if (!DBA::isResult($conversation)) {
2153                         Logger::log("conversation not available.");
2154                         return false;
2155                 }
2156
2157                 $message_uri = $author.":".$guid;
2158
2159                 $person = self::personByHandle($author);
2160                 if (!$person) {
2161                         Logger::log("unable to find author details");
2162                         return false;
2163                 }
2164
2165                 $body = Markdown::toBBCode($text);
2166
2167                 $body = self::replacePeopleGuid($body, $person["url"]);
2168
2169                 return Mail::insert([
2170                         'uid'        => $importer['uid'],
2171                         'guid'       => $guid,
2172                         'convid'     => $conversation['id'],
2173                         'from-name'  => $person['name'],
2174                         'from-photo' => $person['photo'],
2175                         'from-url'   => $person['url'],
2176                         'contact-id' => $contact['id'],
2177                         'title'      => $conversation['subject'],
2178                         'body'       => $body,
2179                         'reply'      => 1,
2180                         'uri'        => $message_uri,
2181                         'parent-uri' => $author.":".$conversation['guid'],
2182                         'created'    => $created_at
2183                 ]);
2184         }
2185
2186         /**
2187          * @brief Processes participations - unsupported by now
2188          *
2189          * @param array  $importer Array of the importer user
2190          * @param object $data     The message object
2191          *
2192          * @return bool always true
2193          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2194          * @throws \ImagickException
2195          */
2196         private static function receiveParticipation(array $importer, $data)
2197         {
2198                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2199                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2200
2201                 $contact_id = Contact::getIdForURL($author);
2202                 if (!$contact_id) {
2203                         Logger::log('Contact not found: '.$author);
2204                         return false;
2205                 }
2206
2207                 $person = self::personByHandle($author);
2208                 if (!is_array($person)) {
2209                         Logger::log("Person not found: ".$author);
2210                         return false;
2211                 }
2212
2213                 $item = Item::selectFirst(['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2214                 if (!DBA::isResult($item)) {
2215                         Logger::log('Item not found, no origin or private: '.$parent_guid);
2216                         return false;
2217                 }
2218
2219                 $author_parts = explode('@', $author);
2220                 if (isset($author_parts[1])) {
2221                         $server = $author_parts[1];
2222                 } else {
2223                         // Should never happen
2224                         $server = $author;
2225                 }
2226
2227                 Logger::log('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, Logger::DEBUG);
2228
2229                 if (!DBA::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2230                         DBA::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2231                 }
2232
2233                 // Send all existing comments and likes to the requesting server
2234                 $comments = Item::select(['id', 'parent', 'verb', 'self'], ['parent' => $item['id']]);
2235                 while ($comment = Item::fetch($comments)) {
2236                         if ($comment['id'] == $comment['parent']) {
2237                                 continue;
2238                         }
2239
2240                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $contact_id]);
2241                         if (Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $contact_id)) {
2242                                 ItemDeliveryData::incrementQueueCount($comment['id'], 1);
2243                         }
2244                 }
2245                 DBA::close($comments);
2246
2247                 return true;
2248         }
2249
2250         /**
2251          * @brief Processes photos - unneeded
2252          *
2253          * @param array  $importer Array of the importer user
2254          * @param object $data     The message object
2255          *
2256          * @return bool always true
2257          */
2258         private static function receivePhoto(array $importer, $data)
2259         {
2260                 // There doesn't seem to be a reason for this function,
2261                 // since the photo data is transmitted in the status message as well
2262                 return true;
2263         }
2264
2265         /**
2266          * @brief Processes poll participations - unssupported
2267          *
2268          * @param array  $importer Array of the importer user
2269          * @param object $data     The message object
2270          *
2271          * @return bool always true
2272          */
2273         private static function receivePollParticipation(array $importer, $data)
2274         {
2275                 // We don't support polls by now
2276                 return true;
2277         }
2278
2279         /**
2280          * @brief Processes incoming profile updates
2281          *
2282          * @param array  $importer Array of the importer user
2283          * @param object $data     The message object
2284          *
2285          * @return bool Success
2286          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2287          * @throws \ImagickException
2288          */
2289         private static function receiveProfile(array $importer, $data)
2290         {
2291                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2292
2293                 $contact = self::contactByHandle($importer["uid"], $author);
2294                 if (!$contact) {
2295                         return false;
2296                 }
2297
2298                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2299                 $image_url = XML::unescape($data->image_url);
2300                 $birthday = XML::unescape($data->birthday);
2301                 $gender = XML::unescape($data->gender);
2302                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2303                 $location = Markdown::toBBCode(XML::unescape($data->location));
2304                 $searchable = (XML::unescape($data->searchable) == "true");
2305                 $nsfw = (XML::unescape($data->nsfw) == "true");
2306                 $tags = XML::unescape($data->tag_string);
2307
2308                 $tags = explode("#", $tags);
2309
2310                 $keywords = [];
2311                 foreach ($tags as $tag) {
2312                         $tag = trim(strtolower($tag));
2313                         if ($tag != "") {
2314                                 $keywords[] = $tag;
2315                         }
2316                 }
2317
2318                 $keywords = implode(", ", $keywords);
2319
2320                 $handle_parts = explode("@", $author);
2321                 $nick = $handle_parts[0];
2322
2323                 if ($name === "") {
2324                         $name = $handle_parts[0];
2325                 }
2326
2327                 if (preg_match("|^https?://|", $image_url) === 0) {
2328                         $image_url = "http://".$handle_parts[1].$image_url;
2329                 }
2330
2331                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2332
2333                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2334
2335                 $birthday = str_replace("1000", "1901", $birthday);
2336
2337                 if ($birthday != "") {
2338                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2339                 }
2340
2341                 // this is to prevent multiple birthday notifications in a single year
2342                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2343
2344                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2345                         $birthday = $contact["bd"];
2346                 }
2347
2348                 $fields = ['name' => $name, 'location' => $location,
2349                         'name-date' => DateTimeFormat::utcNow(),
2350                         'about' => $about, 'gender' => $gender,
2351                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2352                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2353
2354                 if (!empty($birthday)) {
2355                         $fields['bd'] = $birthday;
2356                 }
2357
2358                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2359
2360                 // @todo Update the public contact, then update the gcontact from that
2361
2362                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2363                                         "photo" => $image_url, "name" => $name, "location" => $location,
2364                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2365                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2366                                         "hide" => !$searchable, "nsfw" => $nsfw];
2367
2368                 $gcid = GContact::update($gcontact);
2369
2370                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2371
2372                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2373
2374                 return true;
2375         }
2376
2377         /**
2378          * @brief Processes incoming friend requests
2379          *
2380          * @param array $importer Array of the importer user
2381          * @param array $contact  The contact that send the request
2382          * @return void
2383          * @throws \Exception
2384          */
2385         private static function receiveRequestMakeFriend(array $importer, array $contact)
2386         {
2387                 if ($contact["rel"] == Contact::SHARING) {
2388                         DBA::update(
2389                                 'contact',
2390                                 ['rel' => Contact::FRIEND, 'writable' => true],
2391                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2392                         );
2393                 }
2394         }
2395
2396         /**
2397          * @brief Processes incoming sharing notification
2398          *
2399          * @param array  $importer Array of the importer user
2400          * @param object $data     The message object
2401          *
2402          * @return bool Success
2403          * @throws \Exception
2404          */
2405         private static function receiveContactRequest(array $importer, $data)
2406         {
2407                 $author = XML::unescape($data->author);
2408                 $recipient = XML::unescape($data->recipient);
2409
2410                 if (!$author || !$recipient) {
2411                         return false;
2412                 }
2413
2414                 // the current protocol version doesn't know these fields
2415                 // That means that we will assume their existance
2416                 if (isset($data->following)) {
2417                         $following = (XML::unescape($data->following) == "true");
2418                 } else {
2419                         $following = true;
2420                 }
2421
2422                 if (isset($data->sharing)) {
2423                         $sharing = (XML::unescape($data->sharing) == "true");
2424                 } else {
2425                         $sharing = true;
2426                 }
2427
2428                 $contact = self::contactByHandle($importer["uid"], $author);
2429
2430                 // perhaps we were already sharing with this person. Now they're sharing with us.
2431                 // That makes us friends.
2432                 if ($contact) {
2433                         if ($following) {
2434                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2435                                 self::receiveRequestMakeFriend($importer, $contact);
2436
2437                                 // refetch the contact array
2438                                 $contact = self::contactByHandle($importer["uid"], $author);
2439
2440                                 // If we are now friends, we are sending a share message.
2441                                 // Normally we needn't to do so, but the first message could have been vanished.
2442                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2443                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2444                                         if (DBA::isResult($user)) {
2445                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2446                                                 self::sendShare($user, $contact);
2447                                         }
2448                                 }
2449                                 return true;
2450                         } else {
2451                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2452                                 Contact::removeFollower($importer, $contact);
2453                                 return true;
2454                         }
2455                 }
2456
2457                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2458                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2459                         return false;
2460                 } elseif (!$following && !$sharing) {
2461                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2462                         return false;
2463                 } elseif (!$following && $sharing) {
2464                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2465                 } elseif ($following && $sharing) {
2466                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2467                 } elseif ($following && !$sharing) {
2468                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2469                 }
2470
2471                 $ret = self::personByHandle($author);
2472
2473                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2474                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2475                         return false;
2476                 }
2477
2478                 $cid = Contact::getIdForURL($ret['url'], $importer['uid']);
2479                 if (!empty($cid)) {
2480                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
2481                 } else {
2482                         $contact = [];
2483                 }
2484
2485                 $item = ['author-id' => Contact::getIdForURL($ret['url']),
2486                         'author-link' => $ret['url']];
2487
2488                 $result = Contact::addRelationship($importer, $contact, $item, false);
2489                 if ($result === true) {
2490                         $contact_record = self::contactByHandle($importer['uid'], $author);
2491                         if (!$contact_record) {
2492                                 Logger::info('unable to locate newly created contact record.');
2493                                 return;
2494                         }
2495
2496                         $user = DBA::selectFirst('user', [], ['uid' => $importer['uid']]);
2497                         if (DBA::isResult($user)) {
2498                                 self::sendShare($user, $contact_record);
2499
2500                                 // Send the profile data, maybe it weren't transmitted before
2501                                 self::sendProfile($importer['uid'], [$contact_record]);
2502                         }
2503                 }
2504
2505                 return true;
2506         }
2507
2508         /**
2509          * @brief Fetches a message with a given guid
2510          *
2511          * @param string $guid        message guid
2512          * @param string $orig_author handle of the original post
2513          * @return array The fetched item
2514          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2515          * @throws \ImagickException
2516          */
2517         public static function originalItem($guid, $orig_author)
2518         {
2519                 if (empty($guid)) {
2520                         Logger::log('Empty guid. Quitting.');
2521                         return false;
2522                 }
2523
2524                 // Do we already have this item?
2525                 $fields = ['body', 'title', 'attach', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2526                         'author-name', 'author-link', 'author-avatar'];
2527                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2528                 $item = Item::selectFirst($fields, $condition);
2529
2530                 if (DBA::isResult($item)) {
2531                         Logger::log("reshared message ".$guid." already exists on system.");
2532
2533                         // Maybe it is already a reshared item?
2534                         // Then refetch the content, if it is a reshare from a reshare.
2535                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2536                         if (self::isReshare($item["body"], true)) {
2537                                 $item = [];
2538                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2539                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2540
2541                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2542
2543                                 // Add OEmbed and other information to the body
2544                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2545
2546                                 return $item;
2547                         } else {
2548                                 return $item;
2549                         }
2550                 }
2551
2552                 if (!DBA::isResult($item)) {
2553                         if (empty($orig_author)) {
2554                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2555                                 return false;
2556                         }
2557
2558                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2559                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2560                         $stored = self::storeByGuid($guid, $server);
2561
2562                         if (!$stored) {
2563                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2564                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2565                                 $stored = self::storeByGuid($guid, $server);
2566                         }
2567
2568                         if ($stored) {
2569                                 $fields = ['body', 'title', 'attach', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2570                                         'author-name', 'author-link', 'author-avatar'];
2571                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2572                                 $item = Item::selectFirst($fields, $condition);
2573
2574                                 if (DBA::isResult($item)) {
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"], false)) {
2577                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2578                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2579                                         }
2580
2581                                         return $item;
2582                                 }
2583                         }
2584                 }
2585                 return false;
2586         }
2587
2588         /**
2589          * @brief Stores a reshare activity
2590          *
2591          * @param array   $item              Array of reshare post
2592          * @param integer $parent_message_id Id of the parent post
2593          * @param string  $guid              GUID string of reshare action
2594          * @param string  $author            Author handle
2595          */
2596         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2597         {
2598                 $parent = Item::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2599
2600                 $datarray = [];
2601
2602                 $datarray['uid'] = $item['uid'];
2603                 $datarray['contact-id'] = $item['contact-id'];
2604                 $datarray['network'] = $item['network'];
2605
2606                 $datarray['author-link'] = $item['author-link'];
2607                 $datarray['author-id'] = $item['author-id'];
2608
2609                 $datarray['owner-link'] = $datarray['author-link'];
2610                 $datarray['owner-id'] = $datarray['author-id'];
2611
2612                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2613                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2614                 $datarray['parent-uri'] = $parent['uri'];
2615
2616                 $datarray['verb'] = $datarray['body'] = Activity::ANNOUNCE;
2617                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2618                 $datarray['object-type'] = Activity\ObjectType::NOTE;
2619
2620                 $datarray['protocol'] = $item['protocol'];
2621
2622                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2623                 $datarray['private'] = $item['private'];
2624                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2625
2626                 $message_id = Item::insert($datarray);
2627
2628                 if ($message_id) {
2629                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2630                         if ($datarray['uid'] == 0) {
2631                                 Item::distribute($message_id);
2632                         }
2633                 }
2634         }
2635
2636         /**
2637          * @brief Processes a reshare message
2638          *
2639          * @param array  $importer Array of the importer user
2640          * @param object $data     The message object
2641          * @param string $xml      The original XML of the message
2642          *
2643          * @return int the message id
2644          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2645          * @throws \ImagickException
2646          */
2647         private static function receiveReshare(array $importer, $data, $xml)
2648         {
2649                 $author = Strings::escapeTags(XML::unescape($data->author));
2650                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2651                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2652                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2653                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2654                 /// @todo handle unprocessed property "provider_display_name"
2655                 $public = Strings::escapeTags(XML::unescape($data->public));
2656
2657                 $contact = self::allowedContactByHandle($importer, $author, false);
2658                 if (!$contact) {
2659                         return false;
2660                 }
2661
2662                 $message_id = self::messageExists($importer["uid"], $guid);
2663                 if ($message_id) {
2664                         return true;
2665                 }
2666
2667                 $original_item = self::originalItem($root_guid, $root_author);
2668                 if (!$original_item) {
2669                         return false;
2670                 }
2671
2672                 $orig_url = DI::baseUrl()."/display/".$original_item["guid"];
2673
2674                 $datarray = [];
2675
2676                 $datarray["uid"] = $importer["uid"];
2677                 $datarray["contact-id"] = $contact["id"];
2678                 $datarray["network"]  = Protocol::DIASPORA;
2679
2680                 $datarray["author-link"] = $contact["url"];
2681                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2682
2683                 $datarray["owner-link"] = $datarray["author-link"];
2684                 $datarray["owner-id"] = $datarray["author-id"];
2685
2686                 $datarray["guid"] = $guid;
2687                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2688
2689                 $datarray["verb"] = Activity::POST;
2690                 $datarray["gravity"] = GRAVITY_PARENT;
2691
2692                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2693                 $datarray["source"] = $xml;
2694
2695                 $prefix = share_header(
2696                         $original_item["author-name"],
2697                         $original_item["author-link"],
2698                         $original_item["author-avatar"],
2699                         $original_item["guid"],
2700                         $original_item["created"],
2701                         $orig_url
2702                 );
2703
2704                 if (!empty($original_item['title'])) {
2705                         $prefix .= '[h3]' . $original_item['title'] . "[/h3]\n";
2706                 }
2707
2708                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2709
2710                 $datarray["tag"] = $original_item["tag"];
2711                 $datarray["attach"] = $original_item["attach"];
2712                 $datarray["app"]  = $original_item["app"];
2713
2714                 $datarray["plink"] = self::plink($author, $guid);
2715                 $datarray["private"] = (($public == "false") ? 1 : 0);
2716                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2717
2718                 $datarray["object-type"] = $original_item["object-type"];
2719
2720                 self::fetchGuid($datarray);
2721                 $message_id = Item::insert($datarray);
2722
2723                 self::sendParticipation($contact, $datarray);
2724
2725                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2726                 if ($root_message_id) {
2727                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2728                 }
2729
2730                 if ($message_id) {
2731                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2732                         if ($datarray['uid'] == 0) {
2733                                 Item::distribute($message_id);
2734                         }
2735                         return true;
2736                 } else {
2737                         return false;
2738                 }
2739         }
2740
2741         /**
2742          * @brief Processes retractions
2743          *
2744          * @param array  $importer Array of the importer user
2745          * @param array  $contact  The contact of the item owner
2746          * @param object $data     The message object
2747          *
2748          * @return bool success
2749          * @throws \Exception
2750          */
2751         private static function itemRetraction(array $importer, array $contact, $data)
2752         {
2753                 $author = Strings::escapeTags(XML::unescape($data->author));
2754                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2755                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2756
2757                 $person = self::personByHandle($author);
2758                 if (!is_array($person)) {
2759                         Logger::log("unable to find author detail for ".$author);
2760                         return false;
2761                 }
2762
2763                 if (empty($contact["url"])) {
2764                         $contact["url"] = $person["url"];
2765                 }
2766
2767                 // Fetch items that are about to be deleted
2768                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2769
2770                 // When we receive a public retraction, we delete every item that we find.
2771                 if ($importer['uid'] == 0) {
2772                         $condition = ['guid' => $target_guid, 'deleted' => false];
2773                 } else {
2774                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2775                 }
2776
2777                 $r = Item::select($fields, $condition);
2778                 if (!DBA::isResult($r)) {
2779                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2780                         return false;
2781                 }
2782
2783                 while ($item = Item::fetch($r)) {
2784                         if (strstr($item['file'], '[')) {
2785                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2786                                 continue;
2787                         }
2788
2789                         // Fetch the parent item
2790                         $parent = Item::selectFirst(['author-link'], ['id' => $item["parent"]]);
2791
2792                         // Only delete it if the parent author really fits
2793                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2794                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2795                                 continue;
2796                         }
2797
2798                         Item::delete(['id' => $item['id']]);
2799
2800                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], Logger::DEBUG);
2801                 }
2802
2803                 return true;
2804         }
2805
2806         /**
2807          * @brief Receives retraction messages
2808          *
2809          * @param array  $importer Array of the importer user
2810          * @param string $sender   The sender of the message
2811          * @param object $data     The message object
2812          *
2813          * @return bool Success
2814          * @throws \Exception
2815          */
2816         private static function receiveRetraction(array $importer, $sender, $data)
2817         {
2818                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2819
2820                 $contact = self::contactByHandle($importer["uid"], $sender);
2821                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2822                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2823                         return false;
2824                 }
2825
2826                 if (!$contact) {
2827                         $contact = [];
2828                 }
2829
2830                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2831
2832                 switch ($target_type) {
2833                         case "Comment":
2834                         case "Like":
2835                         case "Post":
2836                         case "Reshare":
2837                         case "StatusMessage":
2838                                 return self::itemRetraction($importer, $contact, $data);
2839
2840                         case "PollParticipation":
2841                         case "Photo":
2842                                 // Currently unsupported
2843                                 break;
2844
2845                         default:
2846                                 Logger::log("Unknown target type ".$target_type);
2847                                 return false;
2848                 }
2849                 return true;
2850         }
2851
2852         /**
2853          * @brief Receives status messages
2854          *
2855          * @param array            $importer Array of the importer user
2856          * @param SimpleXMLElement $data     The message object
2857          * @param string           $xml      The original XML of the message
2858          *
2859          * @return int The message id of the newly created item
2860          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2861          * @throws \ImagickException
2862          */
2863         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2864         {
2865                 $author = Strings::escapeTags(XML::unescape($data->author));
2866                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2867                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2868                 $public = Strings::escapeTags(XML::unescape($data->public));
2869                 $text = XML::unescape($data->text);
2870                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2871
2872                 $contact = self::allowedContactByHandle($importer, $author, false);
2873                 if (!$contact) {
2874                         return false;
2875                 }
2876
2877                 $message_id = self::messageExists($importer["uid"], $guid);
2878                 if ($message_id) {
2879                         return true;
2880                 }
2881
2882                 $address = [];
2883                 if ($data->location) {
2884                         foreach ($data->location->children() as $fieldname => $data) {
2885                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2886                         }
2887                 }
2888
2889                 $body = Markdown::toBBCode($text);
2890
2891                 $datarray = [];
2892
2893                 // Attach embedded pictures to the body
2894                 if ($data->photo) {
2895                         foreach ($data->photo as $photo) {
2896                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2897                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2898                         }
2899
2900                         $datarray["object-type"] = Activity\ObjectType::IMAGE;
2901                 } else {
2902                         $datarray["object-type"] = Activity\ObjectType::NOTE;
2903
2904                         // Add OEmbed and other information to the body
2905                         if (!self::isRedmatrix($contact["url"])) {
2906                                 $body = add_page_info_to_body($body, false, true);
2907                         }
2908                 }
2909
2910                 /// @todo enable support for polls
2911                 //if ($data->poll) {
2912                 //      foreach ($data->poll AS $poll)
2913                 //              print_r($poll);
2914                 //      die("poll!\n");
2915                 //}
2916
2917                 /// @todo enable support for events
2918
2919                 $datarray["uid"] = $importer["uid"];
2920                 $datarray["contact-id"] = $contact["id"];
2921                 $datarray["network"] = Protocol::DIASPORA;
2922
2923                 $datarray["author-link"] = $contact["url"];
2924                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2925
2926                 $datarray["owner-link"] = $datarray["author-link"];
2927                 $datarray["owner-id"] = $datarray["author-id"];
2928
2929                 $datarray["guid"] = $guid;
2930                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2931
2932                 $datarray["verb"] = Activity::POST;
2933                 $datarray["gravity"] = GRAVITY_PARENT;
2934
2935                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2936                 $datarray["source"] = $xml;
2937
2938                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2939
2940                 if ($provider_display_name != "") {
2941                         $datarray["app"] = $provider_display_name;
2942                 }
2943
2944                 $datarray["plink"] = self::plink($author, $guid);
2945                 $datarray["private"] = (($public == "false") ? 1 : 0);
2946                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2947
2948                 if (isset($address["address"])) {
2949                         $datarray["location"] = $address["address"];
2950                 }
2951
2952                 if (isset($address["lat"]) && isset($address["lng"])) {
2953                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2954                 }
2955
2956                 self::fetchGuid($datarray);
2957                 $message_id = Item::insert($datarray);
2958
2959                 self::sendParticipation($contact, $datarray);
2960
2961                 if ($message_id) {
2962                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2963                         if ($datarray['uid'] == 0) {
2964                                 Item::distribute($message_id);
2965                         }
2966                         return true;
2967                 } else {
2968                         return false;
2969                 }
2970         }
2971
2972         /* ************************************************************************************** *
2973          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2974          * ************************************************************************************** */
2975
2976         /**
2977          * @brief returnes the handle of a contact
2978          *
2979          * @param array $contact contact array
2980          *
2981          * @return string the handle in the format user@domain.tld
2982          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2983          */
2984         private static function myHandle(array $contact)
2985         {
2986                 if (!empty($contact["addr"])) {
2987                         return $contact["addr"];
2988                 }
2989
2990                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2991                 // So - just in case - we build the the address here.
2992                 if ($contact["nickname"] != "") {
2993                         $nick = $contact["nickname"];
2994                 } else {
2995                         $nick = $contact["nick"];
2996                 }
2997
2998                 return $nick . "@" . substr(DI::baseUrl(), strpos(DI::baseUrl(), "://") + 3);
2999         }
3000
3001
3002         /**
3003          * @brief Creates the data for a private message in the new format
3004          *
3005          * @param string $msg     The message that is to be transmitted
3006          * @param array  $user    The record of the sender
3007          * @param array  $contact Target of the communication
3008          * @param string $prvkey  The private key of the sender
3009          * @param string $pubkey  The public key of the receiver
3010          *
3011          * @return string The encrypted data
3012          * @throws \Exception
3013          */
3014         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
3015         {
3016                 Logger::log("Message: ".$msg, Logger::DATA);
3017
3018                 // without a public key nothing will work
3019                 if (!$pubkey) {
3020                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
3021                         return false;
3022                 }
3023
3024                 $aes_key = openssl_random_pseudo_bytes(32);
3025                 $b_aes_key = base64_encode($aes_key);
3026                 $iv = openssl_random_pseudo_bytes(16);
3027                 $b_iv = base64_encode($iv);
3028
3029                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3030
3031                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3032
3033                 $encrypted_key_bundle = "";
3034                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3035
3036                 $json_object = json_encode(
3037                         ["aes_key" => base64_encode($encrypted_key_bundle),
3038                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3039                 );
3040
3041                 return $json_object;
3042         }
3043
3044         /**
3045          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3046          *
3047          * @param string $msg  The message that is to be transmitted
3048          * @param array  $user The record of the sender
3049          *
3050          * @return string The envelope
3051          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3052          */
3053         public static function buildMagicEnvelope($msg, array $user)
3054         {
3055                 $b64url_data = Strings::base64UrlEncode($msg);
3056                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3057
3058                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
3059                 $type = "application/xml";
3060                 $encoding = "base64url";
3061                 $alg = "RSA-SHA256";
3062                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
3063
3064                 // Fallback if the private key wasn't transmitted in the expected field
3065                 if ($user['uprvkey'] == "") {
3066                         $user['uprvkey'] = $user['prvkey'];
3067                 }
3068
3069                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3070                 $sig = Strings::base64UrlEncode($signature);
3071
3072                 $xmldata = ["me:env" => ["me:data" => $data,
3073                                                         "@attributes" => ["type" => $type],
3074                                                         "me:encoding" => $encoding,
3075                                                         "me:alg" => $alg,
3076                                                         "me:sig" => $sig,
3077                                                         "@attributes2" => ["key_id" => $key_id]]];
3078
3079                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3080
3081                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3082         }
3083
3084         /**
3085          * @brief Create the envelope for a message
3086          *
3087          * @param string $msg     The message that is to be transmitted
3088          * @param array  $user    The record of the sender
3089          * @param array  $contact Target of the communication
3090          * @param string $prvkey  The private key of the sender
3091          * @param string $pubkey  The public key of the receiver
3092          * @param bool   $public  Is the message public?
3093          *
3094          * @return string The message that will be transmitted to other servers
3095          * @throws \Exception
3096          */
3097         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3098         {
3099                 // The message is put into an envelope with the sender's signature
3100                 $envelope = self::buildMagicEnvelope($msg, $user);
3101
3102                 // Private messages are put into a second envelope, encrypted with the receivers public key
3103                 if (!$public) {
3104                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3105                 }
3106
3107                 return $envelope;
3108         }
3109
3110         /**
3111          * @brief Creates a signature for a message
3112          *
3113          * @param array $owner   the array of the owner of the message
3114          * @param array $message The message that is to be signed
3115          *
3116          * @return string The signature
3117          */
3118         private static function signature($owner, $message)
3119         {
3120                 $sigmsg = $message;
3121                 unset($sigmsg["author_signature"]);
3122                 unset($sigmsg["parent_author_signature"]);
3123
3124                 $signed_text = implode(";", $sigmsg);
3125
3126                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3127         }
3128
3129         /**
3130          * @brief Transmit a message to a target server
3131          *
3132          * @param array  $owner        the array of the item owner
3133          * @param array  $contact      Target of the communication
3134          * @param string $envelope     The message that is to be transmitted
3135          * @param bool   $public_batch Is it a public post?
3136          * @param string $guid         message guid
3137          *
3138          * @return int Result of the transmission
3139          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3140          * @throws \ImagickException
3141          */
3142         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
3143         {
3144                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3145                 if (!$enabled) {
3146                         return 200;
3147                 }
3148
3149                 $logid = Strings::getRandomHex(4);
3150
3151                 // We always try to use the data from the fcontact table.
3152                 // This is important for transmitting data to Friendica servers.
3153                 if (!empty($contact['addr'])) {
3154                         $fcontact = self::personByHandle($contact['addr']);
3155                         if (!empty($fcontact)) {
3156                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3157                         }
3158                 }
3159
3160                 if (empty($dest_url)) {
3161                         $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3162                 }
3163
3164                 if (!$dest_url) {
3165                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3166                         return 0;
3167                 }
3168
3169                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3170
3171                 if (!intval(Config::get("system", "diaspora_test"))) {
3172                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3173
3174                         $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3175                         $return_code = $postResult->getReturnCode();
3176                 } else {
3177                         Logger::log("test_mode");
3178                         return 200;
3179                 }
3180
3181                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3182
3183                 return $return_code ? $return_code : -1;
3184         }
3185
3186
3187         /**
3188          * @brief Build the post xml
3189          *
3190          * @param string $type    The message type
3191          * @param array  $message The message data
3192          *
3193          * @return string The post XML
3194          */
3195         public static function buildPostXml($type, $message)
3196         {
3197                 $data = [$type => $message];
3198
3199                 return XML::fromArray($data, $xml);
3200         }
3201
3202         /**
3203          * @brief Builds and transmit messages
3204          *
3205          * @param array  $owner        the array of the item owner
3206          * @param array  $contact      Target of the communication
3207          * @param string $type         The message type
3208          * @param array  $message      The message data
3209          * @param bool   $public_batch Is it a public post?
3210          * @param string $guid         message guid
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 = "")
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                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3231
3232                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3233
3234                 return $return_code;
3235         }
3236
3237         /**
3238          * @brief sends a participation (Used to get all further updates)
3239          *
3240          * @param array $contact Target of the communication
3241          * @param array $item    Item array
3242          *
3243          * @return int The result of the transmission
3244          * @throws \Exception
3245          */
3246         private static function sendParticipation(array $contact, array $item)
3247         {
3248                 // Don't send notifications for private postings
3249                 if ($item['private']) {
3250                         return;
3251                 }
3252
3253                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3254
3255                 $result = Cache::get($cachekey);
3256                 if (!is_null($result)) {
3257                         return;
3258                 }
3259
3260                 // Fetch some user id to have a valid handle to transmit the participation.
3261                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3262                 // If the item belongs to a user, we take this user id.
3263                 if ($item['uid'] == 0) {
3264                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3265                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3266                         $owner = User::getOwnerDataById($first_user['uid']);
3267                 } else {
3268                         $owner = User::getOwnerDataById($item['uid']);
3269                 }
3270
3271                 $author = self::myHandle($owner);
3272
3273                 $message = ["author" => $author,
3274                                 "guid" => System::createUUID(),
3275                                 "parent_type" => "Post",
3276                                 "parent_guid" => $item["guid"]];
3277
3278                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3279
3280                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3281                 Cache::set($cachekey, $item["guid"], Cache::QUARTER_HOUR);
3282
3283                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3284         }
3285
3286         /**
3287          * @brief sends an account migration
3288          *
3289          * @param array $owner   the array of the item owner
3290          * @param array $contact Target of the communication
3291          * @param int   $uid     User ID
3292          *
3293          * @return int The result of the transmission
3294          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3295          * @throws \ImagickException
3296          */
3297         public static function sendAccountMigration(array $owner, array $contact, $uid)
3298         {
3299                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3300                 $profile = self::createProfileData($uid);
3301
3302                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3303                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3304
3305                 $message = ["author" => $old_handle,
3306                                 "profile" => $profile,
3307                                 "signature" => $signature];
3308
3309                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3310
3311                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3312         }
3313
3314         /**
3315          * @brief Sends a "share" message
3316          *
3317          * @param array $owner   the array of the item owner
3318          * @param array $contact Target of the communication
3319          *
3320          * @return int The result of the transmission
3321          * @throws \Exception
3322          */
3323         public static function sendShare(array $owner, array $contact)
3324         {
3325                 /**
3326                  * @todo support the different possible combinations of "following" and "sharing"
3327                  * Currently, Diaspora only interprets the "sharing" field
3328                  *
3329                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3330                  */
3331
3332                 /*
3333                 switch ($contact["rel"]) {
3334                         case Contact::FRIEND:
3335                                 $following = true;
3336                                 $sharing = true;
3337
3338                         case Contact::SHARING:
3339                                 $following = false;
3340                                 $sharing = true;
3341
3342                         case Contact::FOLLOWER:
3343                                 $following = true;
3344                                 $sharing = false;
3345                 }
3346                 */
3347
3348                 $message = ["author" => self::myHandle($owner),
3349                                 "recipient" => $contact["addr"],
3350                                 "following" => "true",
3351                                 "sharing" => "true"];
3352
3353                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3354
3355                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3356         }
3357
3358         /**
3359          * @brief sends an "unshare"
3360          *
3361          * @param array $owner   the array of the item owner
3362          * @param array $contact Target of the communication
3363          *
3364          * @return int The result of the transmission
3365          * @throws \Exception
3366          */
3367         public static function sendUnshare(array $owner, array $contact)
3368         {
3369                 $message = ["author" => self::myHandle($owner),
3370                                 "recipient" => $contact["addr"],
3371                                 "following" => "false",
3372                                 "sharing" => "false"];
3373
3374                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3375
3376                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3377         }
3378
3379         /**
3380          * @brief Checks a message body if it is a reshare
3381          *
3382          * @param string $body     The message body that is to be check
3383          * @param bool   $complete Should it be a complete check or a simple check?
3384          *
3385          * @return array|bool Reshare details or "false" if no reshare
3386          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3387          * @throws \ImagickException
3388          */
3389         public static function isReshare($body, $complete = true)
3390         {
3391                 $body = trim($body);
3392
3393                 $reshared = Item::getShareArray(['body' => $body]);
3394                 if (empty($reshared)) {
3395                         return false;
3396                 }
3397
3398                 // Skip if it isn't a pure repeated messages
3399                 // Does it start with a share?
3400                 if (!empty($reshared['comment']) && $complete) {
3401                         return false;
3402                 }
3403
3404                 if (!empty($reshared['guid']) && $complete) {
3405                         $condition = ['guid' => $reshared['guid'], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3406                         $item = Item::selectFirst(['contact-id'], $condition);
3407                         if (DBA::isResult($item)) {
3408                                 $ret = [];
3409                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3410                                 $ret["root_guid"] = $reshared['guid'];
3411                                 return $ret;
3412                         } elseif ($complete) {
3413                                 // We are resharing something that isn't a DFRN or Diaspora post.
3414                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3415                                 return false;
3416                         }
3417                 } elseif (empty($reshared['guid']) && $complete) {
3418                         return false;
3419                 }
3420
3421                 $ret = [];
3422
3423                 if (!empty($reshared['profile']) && ($cid = Contact::getIdForURL($reshared['profile']))) {
3424                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $cid]);
3425                         if (!empty($contact['addr'])) {
3426                                 $ret['root_handle'] = $contact['addr'];
3427                         }
3428                 }
3429
3430                 if (empty($ret) && !$complete) {
3431                         return true;
3432                 }
3433
3434                 return $ret;
3435         }
3436
3437         /**
3438          * @brief Create an event array
3439          *
3440          * @param integer $event_id The id of the event
3441          *
3442          * @return array with event data
3443          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3444          */
3445         private static function buildEvent($event_id)
3446         {
3447                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3448                 if (!DBA::isResult($r)) {
3449                         return [];
3450                 }
3451
3452                 $event = $r[0];
3453
3454                 $eventdata = [];
3455
3456                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3457                 if (!DBA::isResult($r)) {
3458                         return [];
3459                 }
3460
3461                 $user = $r[0];
3462
3463                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3464                 if (!DBA::isResult($r)) {
3465                         return [];
3466                 }
3467
3468                 $owner = $r[0];
3469
3470                 $eventdata['author'] = self::myHandle($owner);
3471
3472                 if ($event['guid']) {
3473                         $eventdata['guid'] = $event['guid'];
3474                 }
3475
3476                 $mask = DateTimeFormat::ATOM;
3477
3478                 /// @todo - establish "all day" events in Friendica
3479                 $eventdata["all_day"] = "false";
3480
3481                 $eventdata['timezone'] = 'UTC';
3482                 if (!$event['adjust'] && $user['timezone']) {
3483                         $eventdata['timezone'] = $user['timezone'];
3484                 }
3485
3486                 if ($event['start']) {
3487                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3488                 }
3489                 if ($event['finish'] && !$event['nofinish']) {
3490                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3491                 }
3492                 if ($event['summary']) {
3493                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3494                 }
3495                 if ($event['desc']) {
3496                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3497                 }
3498                 if ($event['location']) {
3499                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3500                         $coord = Map::getCoordinates($event['location']);
3501
3502                         $location = [];
3503                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3504                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3505                                 $location["lat"] = $coord['lat'];
3506                                 $location["lng"] = $coord['lon'];
3507                         } else {
3508                                 $location["lat"] = 0;
3509                                 $location["lng"] = 0;
3510                         }
3511                         $eventdata['location'] = $location;
3512                 }
3513
3514                 return $eventdata;
3515         }
3516
3517         /**
3518          * @brief Create a post (status message or reshare)
3519          *
3520          * @param array $item  The item that will be exported
3521          * @param array $owner the array of the item owner
3522          *
3523          * @return array
3524          * 'type' -> Message type ("status_message" or "reshare")
3525          * 'message' -> Array of XML elements of the status
3526          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3527          * @throws \ImagickException
3528          */
3529         public static function buildStatus(array $item, array $owner)
3530         {
3531                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3532
3533                 $result = Cache::get($cachekey);
3534                 if (!is_null($result)) {
3535                         return $result;
3536                 }
3537
3538                 $myaddr = self::myHandle($owner);
3539
3540                 $public = ($item["private"] ? "false" : "true");
3541                 $created = DateTimeFormat::utc($item['received'], DateTimeFormat::ATOM);
3542                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3543
3544                 // Detect a share element and do a reshare
3545                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3546                         $message = ["author" => $myaddr,
3547                                         "guid" => $item["guid"],
3548                                         "created_at" => $created,
3549                                         "root_author" => $ret["root_handle"],
3550                                         "root_guid" => $ret["root_guid"],
3551                                         "provider_display_name" => $item["app"],
3552                                         "public" => $public];
3553
3554                         $type = "reshare";
3555                 } else {
3556                         $title = $item["title"];
3557                         $body = $item["body"];
3558
3559                         // Fetch the title from an attached link - if there is one
3560                         if (empty($item["title"]) && PConfig::get($owner['uid'], 'system', 'attach_link_title')) {
3561                                 $page_data = BBCode::getAttachmentData($item['body']);
3562                                 if (!empty($page_data['type']) && !empty($page_data['title']) && ($page_data['type'] == 'link')) {
3563                                         $title = $page_data['title'];
3564                                 }
3565                         }
3566
3567                         if ($item['author-link'] != $item['owner-link']) {
3568                                 require_once 'mod/share.php';
3569                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3570                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3571                         }
3572
3573                         // convert to markdown
3574                         $body = html_entity_decode(BBCode::toMarkdown($body));
3575
3576                         // Adding the title
3577                         if (strlen($title)) {
3578                                 $body = "### ".html_entity_decode($title)."\n\n".$body;
3579                         }
3580
3581                         if ($item["attach"]) {
3582                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3583                                 if ($cnt) {
3584                                         $body .= "\n".L10n::t("Attachments:")."\n";
3585                                         foreach ($matches as $mtch) {
3586                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3587                                         }
3588                                 }
3589                         }
3590
3591                         $location = [];
3592
3593                         if ($item["location"] != "")
3594                                 $location["address"] = $item["location"];
3595
3596                         if ($item["coord"] != "") {
3597                                 $coord = explode(" ", $item["coord"]);
3598                                 $location["lat"] = $coord[0];
3599                                 $location["lng"] = $coord[1];
3600                         }
3601
3602                         $message = ["author" => $myaddr,
3603                                         "guid" => $item["guid"],
3604                                         "created_at" => $created,
3605                                         "edited_at" => $edited,
3606                                         "public" => $public,
3607                                         "text" => $body,
3608                                         "provider_display_name" => $item["app"],
3609                                         "location" => $location];
3610
3611                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3612                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3613                                 unset($message["location"]);
3614                         }
3615
3616                         if ($item['event-id'] > 0) {
3617                                 $event = self::buildEvent($item['event-id']);
3618                                 if (count($event)) {
3619                                         $message['event'] = $event;
3620
3621                                         if (!empty($event['location']['address']) &&
3622                                                 !empty($event['location']['lat']) &&
3623                                                 !empty($event['location']['lng'])) {
3624                                                 $message['location'] = $event['location'];
3625                                         }
3626
3627                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3628                                         // $message['text'] = '';
3629                                 }
3630                         }
3631
3632                         $type = "status_message";
3633                 }
3634
3635                 $msg = ["type" => $type, "message" => $message];
3636
3637                 Cache::set($cachekey, $msg, Cache::QUARTER_HOUR);
3638
3639                 return $msg;
3640         }
3641
3642         private static function prependParentAuthorMention($body, $profile_url)
3643         {
3644                 $profile = Contact::getDetailsByURL($profile_url);
3645                 if (!empty($profile['addr'])
3646                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3647                         && !strstr($body, $profile['addr'])
3648                         && !strstr($body, $profile_url)
3649                 ) {
3650                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3651                 }
3652
3653                 return $body;
3654         }
3655
3656         /**
3657          * @brief Sends a post
3658          *
3659          * @param array $item         The item that will be exported
3660          * @param array $owner        the array of the item owner
3661          * @param array $contact      Target of the communication
3662          * @param bool  $public_batch Is it a public post?
3663          *
3664          * @return int The result of the transmission
3665          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3666          * @throws \ImagickException
3667          */
3668         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3669         {
3670                 $status = self::buildStatus($item, $owner);
3671
3672                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3673         }
3674
3675         /**
3676          * @brief Creates a "like" object
3677          *
3678          * @param array $item  The item that will be exported
3679          * @param array $owner the array of the item owner
3680          *
3681          * @return array The data for a "like"
3682          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3683          */
3684         private static function constructLike(array $item, array $owner)
3685         {
3686                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3687                 if (!DBA::isResult($parent)) {
3688                         return false;
3689                 }
3690
3691                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3692                 $positive = null;
3693                 if ($item['verb'] === Activity::LIKE) {
3694                         $positive = "true";
3695                 } elseif ($item['verb'] === Activity::DISLIKE) {
3696                         $positive = "false";
3697                 }
3698
3699                 return(["author" => self::myHandle($owner),
3700                                 "guid" => $item["guid"],
3701                                 "parent_guid" => $parent["guid"],
3702                                 "parent_type" => $target_type,
3703                                 "positive" => $positive,
3704                                 "author_signature" => ""]);
3705         }
3706
3707         /**
3708          * @brief Creates an "EventParticipation" object
3709          *
3710          * @param array $item  The item that will be exported
3711          * @param array $owner the array of the item owner
3712          *
3713          * @return array The data for an "EventParticipation"
3714          * @throws \Exception
3715          */
3716         private static function constructAttend(array $item, array $owner)
3717         {
3718                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3719                 if (!DBA::isResult($parent)) {
3720                         return false;
3721                 }
3722
3723                 switch ($item['verb']) {
3724                         case Activity::ATTEND:
3725                                 $attend_answer = 'accepted';
3726                                 break;
3727                         case Activity::ATTENDNO:
3728                                 $attend_answer = 'declined';
3729                                 break;
3730                         case Activity::ATTENDMAYBE:
3731                                 $attend_answer = 'tentative';
3732                                 break;
3733                         default:
3734                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3735                                 return false;
3736                 }
3737
3738                 return(["author" => self::myHandle($owner),
3739                                 "guid" => $item["guid"],
3740                                 "parent_guid" => $parent["guid"],
3741                                 "status" => $attend_answer,
3742                                 "author_signature" => ""]);
3743         }
3744
3745         /**
3746          * @brief Creates the object for a comment
3747          *
3748          * @param array $item  The item that will be exported
3749          * @param array $owner the array of the item owner
3750          *
3751          * @return array|false The data for a comment
3752          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3753          */
3754         private static function constructComment(array $item, array $owner)
3755         {
3756                 $cachekey = "diaspora:constructComment:".$item['guid'];
3757
3758                 $result = Cache::get($cachekey);
3759                 if (!is_null($result)) {
3760                         return $result;
3761                 }
3762
3763                 $toplevel_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['id' => $item["parent"], 'parent' => $item["parent"]]);
3764                 if (!DBA::isResult($toplevel_item)) {
3765                         Logger::error('Missing parent conversation item', ['parent' => $item["parent"]]);
3766                         return false;
3767                 }
3768
3769                 $thread_parent_item = $toplevel_item;
3770                 if ($item['thr-parent'] != $item['parent-uri']) {
3771                         $thread_parent_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3772                 }
3773
3774                 $body = $item["body"];
3775
3776                 // The replied to autor mention is prepended for clarity if:
3777                 // - Item replied isn't yours
3778                 // - Item is public or explicit mentions are disabled
3779                 // - Implicit mentions are enabled
3780                 if (
3781                         $item['author-id'] != $thread_parent_item['author-id']
3782                         && (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3783                         && !Config::get('system', 'disable_implicit_mentions')
3784                 ) {
3785                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3786                 }
3787
3788                 $text = html_entity_decode(BBCode::toMarkdown($body));
3789                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3790                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3791
3792                 $comment = [
3793                         "author"      => self::myHandle($owner),
3794                         "guid"        => $item["guid"],
3795                         "created_at"  => $created,
3796                         "edited_at"   => $edited,
3797                         "parent_guid" => $toplevel_item["guid"],
3798                         "text"        => $text,
3799                         "author_signature" => ""
3800                 ];
3801
3802                 // Send the thread parent guid only if it is a threaded comment
3803                 if ($item['thr-parent'] != $item['parent-uri']) {
3804                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3805                 }
3806
3807                 Cache::set($cachekey, $comment, Cache::QUARTER_HOUR);
3808
3809                 return($comment);
3810         }
3811
3812         /**
3813          * @brief Send a like or a comment
3814          *
3815          * @param array $item         The item that will be exported
3816          * @param array $owner        the array of the item owner
3817          * @param array $contact      Target of the communication
3818          * @param bool  $public_batch Is it a public post?
3819          *
3820          * @return int The result of the transmission
3821          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3822          * @throws \ImagickException
3823          */
3824         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3825         {
3826                 if (in_array($item['verb'], [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE])) {
3827                         $message = self::constructAttend($item, $owner);
3828                         $type = "event_participation";
3829                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3830                         $message = self::constructLike($item, $owner);
3831                         $type = "like";
3832                 } elseif (!in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
3833                         $message = self::constructComment($item, $owner);
3834                         $type = "comment";
3835                 }
3836
3837                 if (empty($message)) {
3838                         return false;
3839                 }
3840
3841                 $message["author_signature"] = self::signature($owner, $message);
3842
3843                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3844         }
3845
3846         /**
3847          * @brief Creates a message from a signature record entry
3848          *
3849          * @param array $item The item that will be exported
3850          * @return array The message
3851          */
3852         private static function messageFromSignature(array $item)
3853         {
3854                 // Split the signed text
3855                 $signed_parts = explode(";", $item['signed_text']);
3856
3857                 if ($item["deleted"]) {
3858                         $message = ["author" => $item['signer'],
3859                                         "target_guid" => $signed_parts[0],
3860                                         "target_type" => $signed_parts[1]];
3861                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3862                         $message = ["author" => $signed_parts[4],
3863                                         "guid" => $signed_parts[1],
3864                                         "parent_guid" => $signed_parts[3],
3865                                         "parent_type" => $signed_parts[2],
3866                                         "positive" => $signed_parts[0],
3867                                         "author_signature" => $item['signature'],
3868                                         "parent_author_signature" => ""];
3869                 } else {
3870                         // Remove the comment guid
3871                         $guid = array_shift($signed_parts);
3872
3873                         // Remove the parent guid
3874                         $parent_guid = array_shift($signed_parts);
3875
3876                         // Remove the handle
3877                         $handle = array_pop($signed_parts);
3878
3879                         $message = [
3880                                 "author" => $handle,
3881                                 "guid" => $guid,
3882                                 "parent_guid" => $parent_guid,
3883                                 "text" => implode(";", $signed_parts),
3884                                 "author_signature" => $item['signature'],
3885                                 "parent_author_signature" => ""
3886                         ];
3887                 }
3888                 return $message;
3889         }
3890
3891         /**
3892          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3893          *
3894          * @param array $item         The item that will be exported
3895          * @param array $owner        the array of the item owner
3896          * @param array $contact      Target of the communication
3897          * @param bool  $public_batch Is it a public post?
3898          *
3899          * @return int The result of the transmission
3900          * @throws \Exception
3901          */
3902         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3903         {
3904                 if ($item["deleted"]) {
3905                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3906                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3907                         $type = "like";
3908                 } else {
3909                         $type = "comment";
3910                 }
3911
3912                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3913
3914                 // Old way - is used by the internal Friendica functions
3915                 /// @todo Change all signatur storing functions to the new format
3916                 if ($item['signed_text'] && $item['signature'] && $item['signer']) {
3917                         $message = self::messageFromSignature($item);
3918                 } else {// New way
3919                         $msg = json_decode($item['signed_text'], true);
3920
3921                         $message = [];
3922                         if (is_array($msg)) {
3923                                 foreach ($msg as $field => $data) {
3924                                         if (!$item["deleted"]) {
3925                                                 if ($field == "diaspora_handle") {
3926                                                         $field = "author";
3927                                                 }
3928                                                 if ($field == "target_type") {
3929                                                         $field = "parent_type";
3930                                                 }
3931                                         }
3932
3933                                         $message[$field] = $data;
3934                                 }
3935                         } else {
3936                                 Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3937                         }
3938                 }
3939
3940                 $message["parent_author_signature"] = self::signature($owner, $message);
3941
3942                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
3943
3944                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3945         }
3946
3947         /**
3948          * @brief Sends a retraction (deletion) of a message, like or comment
3949          *
3950          * @param array $item         The item that will be exported
3951          * @param array $owner        the array of the item owner
3952          * @param array $contact      Target of the communication
3953          * @param bool  $public_batch Is it a public post?
3954          * @param bool  $relay        Is the retraction transmitted from a relay?
3955          *
3956          * @return int The result of the transmission
3957          * @throws \Exception
3958          */
3959         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3960         {
3961                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3962
3963                 $msg_type = "retraction";
3964
3965                 if ($item['id'] == $item['parent']) {
3966                         $target_type = "Post";
3967                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3968                         $target_type = "Like";
3969                 } else {
3970                         $target_type = "Comment";
3971                 }
3972
3973                 $message = ["author" => $itemaddr,
3974                                 "target_guid" => $item['guid'],
3975                                 "target_type" => $target_type];
3976
3977                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
3978
3979                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3980         }
3981
3982         /**
3983          * @brief Sends a mail
3984          *
3985          * @param array $item    The item that will be exported
3986          * @param array $owner   The owner
3987          * @param array $contact Target of the communication
3988          *
3989          * @return int The result of the transmission
3990          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3991          * @throws \ImagickException
3992          */
3993         public static function sendMail(array $item, array $owner, array $contact)
3994         {
3995                 $myaddr = self::myHandle($owner);
3996
3997                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
3998                 if (!DBA::isResult($cnv)) {
3999                         Logger::log("conversation not found.");
4000                         return;
4001                 }
4002
4003                 $body = BBCode::toMarkdown($item["body"]);
4004                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4005
4006                 $msg = [
4007                         "author" => $myaddr,
4008                         "guid" => $item["guid"],
4009                         "conversation_guid" => $cnv["guid"],
4010                         "text" => $body,
4011                         "created_at" => $created,
4012                 ];
4013
4014                 if ($item["reply"]) {
4015                         $message = $msg;
4016                         $type = "message";
4017                 } else {
4018                         $message = [
4019                                 "author" => $cnv["creator"],
4020                                 "guid" => $cnv["guid"],
4021                                 "subject" => $cnv["subject"],
4022                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4023                                 "participants" => $cnv["recips"],
4024                                 "message" => $msg
4025                         ];
4026
4027                         $type = "conversation";
4028                 }
4029
4030                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4031         }
4032
4033         /**
4034          * @brief Split a name into first name and last name
4035          *
4036          * @param string $name The name
4037          *
4038          * @return array The array with "first" and "last"
4039          */
4040         public static function splitName($name) {
4041                 $name = trim($name);
4042
4043                 // Is the name longer than 64 characters? Then cut the rest of it.
4044                 if (strlen($name) > 64) {
4045                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4046                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4047                         } else {
4048                                 $name = substr($name, 0, 64);
4049                         }
4050                 }
4051
4052                 // Take the first word as first name
4053                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4054                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4055                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4056                         return ['first' => $first, 'last' => $last];
4057                 }
4058
4059                 // Take the last word as last name
4060                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4061                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4062
4063                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4064                         return ['first' => $first, 'last' => $last];
4065                 }
4066
4067                 // Take the first 32 characters if there is no space in the first 32 characters
4068                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4069                         $first = substr($name, 0, 32);
4070                         $last = substr($name, 32);
4071                         return ['first' => $first, 'last' => $last];
4072                 }
4073
4074                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4075                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4076
4077                 // Check if the last name is longer than 32 characters
4078                 if (strlen($last) > 32) {
4079                         if (strpos($last, ' ') <= 32) {
4080                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4081                         } else {
4082                                 $last = substr($last, 0, 32);
4083                         }
4084                 }
4085
4086                 return ['first' => $first, 'last' => $last];
4087         }
4088
4089         /**
4090          * @brief Create profile data
4091          *
4092          * @param int $uid The user id
4093          *
4094          * @return array The profile data
4095          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4096          */
4097         private static function createProfileData($uid)
4098         {
4099                 $r = q(
4100                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4101                         FROM `profile`
4102                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4103                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4104                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4105                         intval($uid)
4106                 );
4107
4108                 if (!$r) {
4109                         return [];
4110                 }
4111
4112                 $profile = $r[0];
4113                 $handle = $profile["addr"];
4114
4115                 $split_name = self::splitName($profile['name']);
4116                 $first = $split_name['first'];
4117                 $last = $split_name['last'];
4118
4119                 $large = DI::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4120                 $medium = DI::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4121                 $small = DI::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4122                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4123
4124                 $dob = null;
4125                 $about = null;
4126                 $location = null;
4127                 $tags = null;
4128                 if ($searchable === 'true') {
4129                         $dob = '';
4130
4131                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4132                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4133                                 if ($year < 1004) {
4134                                         $year = 1004;
4135                                 }
4136                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4137                         }
4138
4139                         $about = $profile['about'];
4140                         $about = strip_tags(BBCode::convert($about));
4141
4142                         $location = Profile::formatLocation($profile);
4143                         $tags = '';
4144                         if ($profile['pub_keywords']) {
4145                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4146                                 $kw = str_replace('  ', ' ', $kw);
4147                                 $arr = explode(' ', $kw);
4148                                 if (count($arr)) {
4149                                         for ($x = 0; $x < 5; $x ++) {
4150                                                 if (!empty($arr[$x])) {
4151                                                         $tags .= '#'. trim($arr[$x]) .' ';
4152                                                 }
4153                                         }
4154                                 }
4155                         }
4156                         $tags = trim($tags);
4157                 }
4158
4159                 return ["author" => $handle,
4160                                 "first_name" => $first,
4161                                 "last_name" => $last,
4162                                 "image_url" => $large,
4163                                 "image_url_medium" => $medium,
4164                                 "image_url_small" => $small,
4165                                 "birthday" => $dob,
4166                                 "gender" => $profile['gender'],
4167                                 "bio" => $about,
4168                                 "location" => $location,
4169                                 "searchable" => $searchable,
4170                                 "nsfw" => "false",
4171                                 "tag_string" => $tags];
4172         }
4173
4174         /**
4175          * @brief Sends profile data
4176          *
4177          * @param int  $uid    The user id
4178          * @param bool $recips optional, default false
4179          * @return void
4180          * @throws \Exception
4181          */
4182         public static function sendProfile($uid, $recips = false)
4183         {
4184                 if (!$uid) {
4185                         return;
4186                 }
4187
4188                 $owner = User::getOwnerDataById($uid);
4189                 if (!$owner) {
4190                         return;
4191                 }
4192
4193                 if (!$recips) {
4194                         $recips = q(
4195                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4196                                 AND `uid` = %d AND `rel` != %d",
4197                                 DBA::escape(Protocol::DIASPORA),
4198                                 intval($uid),
4199                                 intval(Contact::SHARING)
4200                         );
4201                 }
4202
4203                 if (!$recips) {
4204                         return;
4205                 }
4206
4207                 $message = self::createProfileData($uid);
4208
4209                 // @ToDo Split this into single worker jobs
4210                 foreach ($recips as $recip) {
4211                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4212                         self::buildAndTransmit($owner, $recip, "profile", $message);
4213                 }
4214         }
4215
4216         /**
4217          * @brief Creates the signature for likes that are created on our system
4218          *
4219          * @param integer $uid  The user of that comment
4220          * @param array   $item Item array
4221          *
4222          * @return array Signed content
4223          * @throws \Exception
4224          */
4225         public static function createLikeSignature($uid, array $item)
4226         {
4227                 $owner = User::getOwnerDataById($uid);
4228                 if (empty($owner)) {
4229                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4230                         return false;
4231                 }
4232
4233                 if (!in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4234                         return false;
4235                 }
4236
4237                 $message = self::constructLike($item, $owner);
4238                 if ($message === false) {
4239                         return false;
4240                 }
4241
4242                 $message["author_signature"] = self::signature($owner, $message);
4243
4244                 return $message;
4245         }
4246
4247         /**
4248          * @brief Creates the signature for Comments that are created on our system
4249          *
4250          * @param integer $uid  The user of that comment
4251          * @param array   $item Item array
4252          *
4253          * @return array Signed content
4254          * @throws \Exception
4255          */
4256         public static function createCommentSignature($uid, array $item)
4257         {
4258                 $owner = User::getOwnerDataById($uid);
4259                 if (empty($owner)) {
4260                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4261                         return false;
4262                 }
4263
4264                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4265                 $item['thr-parent'] = $item['parent-uri'];
4266
4267                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4268                 if (!DBA::isResult($parent)) {
4269                         return;
4270                 }
4271
4272                 $item['parent-uri'] = $parent['parent-uri'];
4273
4274                 $message = self::constructComment($item, $owner);
4275                 if ($message === false) {
4276                         return false;
4277                 }
4278
4279                 $message["author_signature"] = self::signature($owner, $message);
4280
4281                 return $message;
4282         }
4283 }