src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @file src/Protocol/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  *
   6  * The new protocol is described here: http://diaspora.github.io/diaspora_federation/index.html
   7  * This implementation here interprets the old and the new protocol and sends the new one.
   8  * In the future we will remove most stuff from "validPosting" and interpret only the new protocol.
   9  */
  10
  11 namespace Friendica\Protocol;
  12
  13 use Friendica\Content\Text\BBCode;
  14 use Friendica\Content\Text\Markdown;
  15 use Friendica\Core\Cache;
  16 use Friendica\Core\Config;
  17 use Friendica\Core\L10n;
  18 use Friendica\Core\PConfig;
  19 use Friendica\Core\System;
  20 use Friendica\Core\Worker;
  21 use Friendica\Database\DBM;
  22 use Friendica\Model\Contact;
  23 use Friendica\Model\GContact;
  24 use Friendica\Model\Group;
  25 use Friendica\Model\Item;
  26 use Friendica\Model\Profile;
  27 use Friendica\Model\Queue;
  28 use Friendica\Model\User;
  29 use Friendica\Network\Probe;
  30 use Friendica\Util\Crypto;
  31 use Friendica\Util\DateTimeFormat;
  32 use Friendica\Util\Network;
  33 use Friendica\Util\XML;
  34 use Friendica\Util\Map;
  35 use dba;
  36 use SimpleXMLElement;
  37
  38 require_once 'include/dba.php';
  39 require_once 'include/items.php';
  40
  41 /**
  42  * @brief This class contain functions to create and send Diaspora XML files
  43  *
  44  */
  45 class Diaspora
  46 {
  47         /**
  48          * @brief Return a list of relay servers
  49          *
  50          * The list contains not only the official relays but also servers that we serve directly
  51          *
  52          * @param integer $item_id  The id of the item that is sent
  53          * @param array   $contacts The previously fetched contacts
  54          *
  55          * @return array of relay servers
  56          */
  57         public static function relayList($item_id, $contacts = [])
  58         {
  59                 $serverlist = [];
  60
  61                 // Fetching relay servers
  62                 $serverdata = Config::get("system", "relay_server");
  63                 if ($serverdata != "") {
  64                         $servers = explode(",", $serverdata);
  65                         foreach ($servers as $server) {
  66                                 $serverlist[$server] = trim($server);
  67                         }
  68                 }
  69
  70                 if (Config::get("system", "relay_directly", false)) {
  71                         // Servers that want to get all content
  72                         $servers = dba::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  73                         while ($server = dba::fetch($servers)) {
  74                                 $serverlist[$server['url']] = $server['url'];
  75                         }
  76
  77                         // All tags of the current post
  78                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $item_id];
  79                         $tags = dba::select('term', ['term'], $condition);
  80                         $taglist = [];
  81                         while ($tag = dba::fetch($tags)) {
  82                                 $taglist[] = $tag['term'];
  83                         }
  84
  85                         // All servers who wants content with this tag
  86                         $tagserverlist = [];
  87                         if (!empty($taglist)) {
  88                                 $tagserver = dba::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  89                                 while ($server = dba::fetch($tagserver)) {
  90                                         $tagserverlist[] = $server['gserver-id'];
  91                                 }
  92                         }
  93
  94                         // All adresses with the given id
  95                         if (!empty($tagserverlist)) {
  96                                 $servers = dba::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
  97                                 while ($server = dba::fetch($servers)) {
  98                                         $serverlist[$server['url']] = $server['url'];
  99                                 }
 100                         }
 101                 }
 102
 103                 // Now we are collecting all relay contacts
 104                 foreach ($serverlist as $server_url) {
 105                         // We don't send messages to ourselves
 106                         if (link_compare($server_url, System::baseUrl())) {
 107                                 continue;
 108                         }
 109                         $contact = self::getRelayContact($server_url);
 110                         if (is_bool($contact)) {
 111                                 continue;
 112                         }
 113
 114                         $exists = false;
 115                         foreach ($contacts as $entry) {
 116                                 if ($entry['batch'] == $contact['batch']) {
 117                                         $exists = true;
 118                                 }
 119                         }
 120
 121                         if (!$exists) {
 122                                 $contacts[] = $contact;
 123                         }
 124                 }
 125
 126                 return $contacts;
 127         }
 128
 129         /**
 130          * @brief Return a contact for a given server address or creates a dummy entry
 131          *
 132          * @param string $server_url The url of the server
 133          * @return array with the contact
 134          */
 135         private static function getRelayContact($server_url)
 136         {
 137                 $batch = $server_url . '/receive/public';
 138
 139                 $fields = ['batch', 'id', 'name', 'network', 'archive', 'blocked'];
 140
 141                 // Fetch the relay contact
 142                 $condition = ['uid' => 0, 'network' => NETWORK_DIASPORA, 'batch' => $batch,
 143                         'contact-type' => ACCOUNT_TYPE_RELAY];
 144                 $contact = dba::selectFirst('contact', $fields, $condition);
 145
 146                 // If there is nothing found, we check if there is some unmarked relay
 147                 // This code segment can be removed before the release 2018-05
 148                 if (!DBM::is_result($contact)) {
 149                         $condition = ['uid' => 0, 'network' => NETWORK_DIASPORA, 'batch' => $batch,
 150                                 'name' => 'relay', 'nick' => 'relay', 'url' => $server_url];
 151                         $contact = dba::selectFirst('contact', $fields, $condition);
 152
 153                         if (DBM::is_result($contact)) {
 154                                 // Mark the relay account as a relay account
 155                                 $fields = ['contact-type' => ACCOUNT_TYPE_RELAY];
 156                                 dba::update('contact', $fields, ['id' => $contact['id']]);
 157                         }
 158                 }
 159                 if (DBM::is_result($contact)) {
 160                         if ($contact['archive'] || $contact['blocked']) {
 161                                 return false;
 162                         }
 163                         return $contact;
 164                 } else {
 165                         $fields = ['uid' => 0, 'created' => DateTimeFormat::utcNow(),
 166                                 'name' => 'relay', 'nick' => 'relay',
 167                                 'url' => $server_url, 'nurl' => normalise_link($server_url),
 168                                 'batch' => $batch, 'network' => NETWORK_DIASPORA,
 169                                 'rel' => CONTACT_IS_FOLLOWER, 'blocked' => false,
 170                                 'contact-type' => ACCOUNT_TYPE_RELAY,
 171                                 'pending' => false, 'writable' => true];
 172                         dba::insert('contact', $fields);
 173
 174                         $fields = ['batch', 'id', 'name', 'network'];
 175                         $contact = dba::selectFirst('contact', $fields, $condition);
 176                         if (DBM::is_result($contact)) {
 177                                 return $contact;
 178                         }
 179
 180                 }
 181
 182                 // It should never happen that we arrive here
 183                 return [];
 184         }
 185
 186         /**
 187          * @brief Return a list of participating contacts for a thread
 188          *
 189          * This is used for the participation feature.
 190          * One of the parameters is a contact array.
 191          * This is done to avoid duplicates.
 192          *
 193          * @param integer $thread   The id of the thread
 194          * @param array   $contacts The previously fetched contacts
 195          *
 196          * @return array of relay servers
 197          */
 198         public static function participantsForThread($thread, $contacts)
 199         {
 200                 $r = dba::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`,
 201                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 202                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 203                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 204                                 WHERE `participation`.`iid` = ?", $thread);
 205
 206                 while ($contact = dba::fetch($r)) {
 207                         if (!empty($contact['fnetwork'])) {
 208                                 $contact['network'] = $contact['fnetwork'];
 209                         }
 210                         unset($contact['fnetwork']);
 211
 212                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 213                                 $contact['batch'] = $contact['fbatch'];
 214                         }
 215                         unset($contact['fbatch']);
 216
 217                         $exists = false;
 218                         foreach ($contacts as $entry) {
 219                                 if ($entry['batch'] == $contact['batch']) {
 220                                         $exists = true;
 221                                 }
 222                         }
 223
 224                         if (!$exists) {
 225                                 $contacts[] = $contact;
 226                         }
 227                 }
 228                 dba::close($r);
 229
 230                 return $contacts;
 231         }
 232
 233         /**
 234          * @brief repairs a signature that was double encoded
 235          *
 236          * The function is unused at the moment. It was copied from the old implementation.
 237          *
 238          * @param string  $signature The signature
 239          * @param string  $handle    The handle of the signature owner
 240          * @param integer $level     This value is only set inside this function to avoid endless loops
 241          *
 242          * @return string the repaired signature
 243          */
 244         private static function repairSignature($signature, $handle = "", $level = 1)
 245         {
 246                 if ($signature == "") {
 247                         return ($signature);
 248                 }
 249
 250                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 251                         $signature = base64_decode($signature);
 252                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
 253
 254                         // Do a recursive call to be able to fix even multiple levels
 255                         if ($level < 10) {
 256                                 $signature = self::repairSignature($signature, $handle, ++$level);
 257                         }
 258                 }
 259
 260                 return($signature);
 261         }
 262
 263         /**
 264          * @brief verify the envelope and return the verified data
 265          *
 266          * @param string $envelope The magic envelope
 267          *
 268          * @return string verified data
 269          */
 270         private static function verifyMagicEnvelope($envelope)
 271         {
 272                 $basedom = XML::parseString($envelope);
 273
 274                 if (!is_object($basedom)) {
 275                         logger("Envelope is no XML file");
 276                         return false;
 277                 }
 278
 279                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 280
 281                 if (sizeof($children) == 0) {
 282                         logger("XML has no children");
 283                         return false;
 284                 }
 285
 286                 $handle = "";
 287
 288                 $data = base64url_decode($children->data);
 289                 $type = $children->data->attributes()->type[0];
 290
 291                 $encoding = $children->encoding;
 292
 293                 $alg = $children->alg;
 294
 295                 $sig = base64url_decode($children->sig);
 296                 $key_id = $children->sig->attributes()->key_id[0];
 297                 if ($key_id != "") {
 298                         $handle = base64url_decode($key_id);
 299                 }
 300
 301                 $b64url_data = base64url_encode($data);
 302                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 303
 304                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 305
 306                 if ($handle == '') {
 307                         logger('No author could be decoded. Discarding. Message: ' . $envelope);
 308                         return false;
 309                 }
 310
 311                 $key = self::key($handle);
 312                 if ($key == '') {
 313                         logger("Couldn't get a key for handle " . $handle . ". Discarding.");
 314                         return false;
 315                 }
 316
 317                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 318                 if (!$verify) {
 319                         logger('Message from ' . $handle . ' did not verify. Discarding.');
 320                         return false;
 321                 }
 322
 323                 return $data;
 324         }
 325
 326         /**
 327          * @brief encrypts data via AES
 328          *
 329          * @param string $key  The AES key
 330          * @param string $iv   The IV (is used for CBC encoding)
 331          * @param string $data The data that is to be encrypted
 332          *
 333          * @return string encrypted data
 334          */
 335         private static function aesEncrypt($key, $iv, $data)
 336         {
 337                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 338         }
 339
 340         /**
 341          * @brief decrypts data via AES
 342          *
 343          * @param string $key       The AES key
 344          * @param string $iv        The IV (is used for CBC encoding)
 345          * @param string $encrypted The encrypted data
 346          *
 347          * @return string decrypted data
 348          */
 349         private static function aesDecrypt($key, $iv, $encrypted)
 350         {
 351                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 352         }
 353
 354         /**
 355          * @brief: Decodes incoming Diaspora message in the new format
 356          *
 357          * @param array  $importer Array of the importer user
 358          * @param string $raw      raw post message
 359          *
 360          * @return array
 361          * 'message' -> decoded Diaspora XML message
 362          * 'author' -> author diaspora handle
 363          * 'key' -> author public key (converted to pkcs#8)
 364          */
 365         public static function decodeRaw($importer, $raw)
 366         {
 367                 $data = json_decode($raw);
 368
 369                 // Is it a private post? Then decrypt the outer Salmon
 370                 if (is_object($data)) {
 371                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 372                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 373
 374                         $outer_key_bundle = '';
 375                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 376                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 377
 378                         if (!is_object($j_outer_key_bundle)) {
 379                                 logger('Outer Salmon did not verify. Discarding.');
 380                                 System::httpExit(400);
 381                         }
 382
 383                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 384                         $outer_key = base64_decode($j_outer_key_bundle->key);
 385
 386                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 387                 } else {
 388                         $xml = $raw;
 389                 }
 390
 391                 $basedom = XML::parseString($xml);
 392
 393                 if (!is_object($basedom)) {
 394                         logger('Received data does not seem to be an XML. Discarding. '.$xml);
 395                         System::httpExit(400);
 396                 }
 397
 398                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 399
 400                 // Not sure if this cleaning is needed
 401                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 402
 403                 // Build the signed data
 404                 $type = $base->data[0]->attributes()->type[0];
 405                 $encoding = $base->encoding;
 406                 $alg = $base->alg;
 407                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 408
 409                 // This is the signature
 410                 $signature = base64url_decode($base->sig);
 411
 412                 // Get the senders' public key
 413                 $key_id = $base->sig[0]->attributes()->key_id[0];
 414                 $author_addr = base64_decode($key_id);
 415                 if ($author_addr == '') {
 416                         logger('No author could be decoded. Discarding. Message: ' . $xml);
 417                         System::httpExit(400);
 418                 }
 419
 420                 $key = self::key($author_addr);
 421                 if ($key == '') {
 422                         logger("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 423                         System::httpExit(400);
 424                 }
 425
 426                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 427                 if (!$verify) {
 428                         logger('Message did not verify. Discarding.');
 429                         System::httpExit(400);
 430                 }
 431
 432                 return ['message' => (string)base64url_decode($base->data),
 433                                 'author' => unxmlify($author_addr),
 434                                 'key' => (string)$key];
 435         }
 436
 437         /**
 438          * @brief: Decodes incoming Diaspora message in the deprecated format
 439          *
 440          * @param array  $importer Array of the importer user
 441          * @param string $xml      urldecoded Diaspora salmon
 442          *
 443          * @return array
 444          * 'message' -> decoded Diaspora XML message
 445          * 'author' -> author diaspora handle
 446          * 'key' -> author public key (converted to pkcs#8)
 447          */
 448         public static function decode($importer, $xml)
 449         {
 450                 $public = false;
 451                 $basedom = XML::parseString($xml);
 452
 453                 if (!is_object($basedom)) {
 454                         logger("XML is not parseable.");
 455                         return false;
 456                 }
 457                 $children = $basedom->children('https://joindiaspora.com/protocol');
 458
 459                 $inner_aes_key = null;
 460                 $inner_iv = null;
 461
 462                 if ($children->header) {
 463                         $public = true;
 464                         $author_link = str_replace('acct:', '', $children->header->author_id);
 465                 } else {
 466                         // This happens with posts from a relais
 467                         if (!$importer) {
 468                                 logger("This is no private post in the old format", LOGGER_DEBUG);
 469                                 return false;
 470                         }
 471
 472                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 473
 474                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 475                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 476
 477                         $outer_key_bundle = '';
 478                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 479
 480                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 481
 482                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 483                         $outer_key = base64_decode($j_outer_key_bundle->key);
 484
 485                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 486
 487                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 488                         $idom = XML::parseString($decrypted);
 489
 490                         $inner_iv = base64_decode($idom->iv);
 491                         $inner_aes_key = base64_decode($idom->aes_key);
 492
 493                         $author_link = str_replace('acct:', '', $idom->author_id);
 494                 }
 495
 496                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 497
 498                 // figure out where in the DOM tree our data is hiding
 499
 500                 $base = null;
 501                 if ($dom->provenance->data) {
 502                         $base = $dom->provenance;
 503                 } elseif ($dom->env->data) {
 504                         $base = $dom->env;
 505                 } elseif ($dom->data) {
 506                         $base = $dom;
 507                 }
 508
 509                 if (!$base) {
 510                         logger('unable to locate salmon data in xml');
 511                         System::httpExit(400);
 512                 }
 513
 514
 515                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 516                 $signature = base64url_decode($base->sig);
 517
 518                 // unpack the  data
 519
 520                 // strip whitespace so our data element will return to one big base64 blob
 521                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 522
 523
 524                 // stash away some other stuff for later
 525
 526                 $type = $base->data[0]->attributes()->type[0];
 527                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 528                 $encoding = $base->encoding;
 529                 $alg = $base->alg;
 530
 531
 532                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 533
 534
 535                 // decode the data
 536                 $data = base64url_decode($data);
 537
 538
 539                 if ($public) {
 540                         $inner_decrypted = $data;
 541                 } else {
 542                         // Decode the encrypted blob
 543                         $inner_encrypted = base64_decode($data);
 544                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 545                 }
 546
 547                 if (!$author_link) {
 548                         logger('Could not retrieve author URI.');
 549                         System::httpExit(400);
 550                 }
 551                 // Once we have the author URI, go to the web and try to find their public key
 552                 // (first this will look it up locally if it is in the fcontact cache)
 553                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 554
 555                 logger('Fetching key for '.$author_link);
 556                 $key = self::key($author_link);
 557
 558                 if (!$key) {
 559                         logger('Could not retrieve author key.');
 560                         System::httpExit(400);
 561                 }
 562
 563                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 564
 565                 if (!$verify) {
 566                         logger('Message did not verify. Discarding.');
 567                         System::httpExit(400);
 568                 }
 569
 570                 logger('Message verified.');
 571
 572                 return ['message' => (string)$inner_decrypted,
 573                                 'author' => unxmlify($author_link),
 574                                 'key' => (string)$key];
 575         }
 576
 577
 578         /**
 579          * @brief Dispatches public messages and find the fitting receivers
 580          *
 581          * @param array $msg The post that will be dispatched
 582          *
 583          * @return int The message id of the generated message, "true" or "false" if there was an error
 584          */
 585         public static function dispatchPublic($msg)
 586         {
 587                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 588                 if (!$enabled) {
 589                         logger("diaspora is disabled");
 590                         return false;
 591                 }
 592
 593                 if (!($postdata = self::validPosting($msg))) {
 594                         logger("Invalid posting");
 595                         return false;
 596                 }
 597
 598                 $fields = $postdata['fields'];
 599
 600                 // Is it a an action (comment, like, ...) for our own post?
 601                 if (isset($fields->parent_guid) && !$postdata["relayed"]) {
 602                         $guid = notags(unxmlify($fields->parent_guid));
 603                         $importer = self::importerForGuid($guid);
 604                         if (is_array($importer)) {
 605                                 logger("delivering to origin: ".$importer["name"]);
 606                                 $message_id = self::dispatch($importer, $msg, $fields);
 607                                 return $message_id;
 608                         }
 609                 }
 610
 611                 // Process item retractions. This has to be done separated from the other stuff,
 612                 // since retractions for comments could come even from non followers.
 613                 if (!empty($fields) && in_array($fields->getName(), ['retraction'])) {
 614                         $target = notags(unxmlify($fields->target_type));
 615                         if (in_array($target, ["Comment", "Like", "Post", "Reshare", "StatusMessage"])) {
 616                                 logger('processing retraction for '.$target, LOGGER_DEBUG);
 617                                 $importer = ["uid" => 0, "page-flags" => PAGE_FREELOVE];
 618                                 $message_id = self::dispatch($importer, $msg, $fields);
 619                                 return $message_id;
 620                         }
 621                 }
 622
 623                 // Now distribute it to the followers
 624                 $r = q(
 625                         "SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 626                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 627                         AND NOT `account_expired` AND NOT `account_removed`",
 628                         dbesc(NETWORK_DIASPORA),
 629                         dbesc($msg["author"])
 630                 );
 631
 632                 if (DBM::is_result($r)) {
 633                         foreach ($r as $rr) {
 634                                 logger("delivering to: ".$rr["username"]);
 635                                 self::dispatch($rr, $msg, $fields);
 636                         }
 637                 } elseif (!Config::get('system', 'relay_subscribe', false)) {
 638                         logger("Unwanted message from ".$msg["author"]." send by ".$_SERVER["REMOTE_ADDR"]." with ".$_SERVER["HTTP_USER_AGENT"].": ".print_r($msg, true), LOGGER_DEBUG);
 639                 } else {
 640                         // Use a dummy importer to import the data for the public copy
 641                         $importer = ["uid" => 0, "page-flags" => PAGE_FREELOVE];
 642                         $message_id = self::dispatch($importer, $msg, $fields);
 643                 }
 644
 645                 return $message_id;
 646         }
 647
 648         /**
 649          * @brief Dispatches the different message types to the different functions
 650          *
 651          * @param array  $importer Array of the importer user
 652          * @param array  $msg      The post that will be dispatched
 653          * @param object $fields   SimpleXML object that contains the message
 654          *
 655          * @return int The message id of the generated message, "true" or "false" if there was an error
 656          */
 657         public static function dispatch($importer, $msg, $fields = null)
 658         {
 659                 // The sender is the handle of the contact that sent the message.
 660                 // This will often be different with relayed messages (for example "like" and "comment")
 661                 $sender = $msg["author"];
 662
 663                 // This is only needed for private postings since this is already done for public ones before
 664                 if (is_null($fields)) {
 665                         if (!($postdata = self::validPosting($msg))) {
 666                                 logger("Invalid posting");
 667                                 return false;
 668                         }
 669                         $fields = $postdata['fields'];
 670                 }
 671
 672                 $type = $fields->getName();
 673
 674                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 675
 676                 switch ($type) {
 677                         case "account_migration":
 678                                 return self::receiveAccountMigration($importer, $fields);
 679
 680                         case "account_deletion":
 681                                 return self::receiveAccountDeletion($importer, $fields);
 682
 683                         case "comment":
 684                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 685
 686                         case "contact":
 687                                 return self::receiveContactRequest($importer, $fields);
 688
 689                         case "conversation":
 690                                 return self::receiveConversation($importer, $msg, $fields);
 691
 692                         case "like":
 693                                 return self::receiveLike($importer, $sender, $fields);
 694
 695                         case "message":
 696                                 return self::receiveMessage($importer, $fields);
 697
 698                         case "participation":
 699                                 return self::receiveParticipation($importer, $fields);
 700
 701                         case "photo": // Not implemented
 702                                 return self::receivePhoto($importer, $fields);
 703
 704                         case "poll_participation": // Not implemented
 705                                 return self::receivePollParticipation($importer, $fields);
 706
 707                         case "profile":
 708                                 return self::receiveProfile($importer, $fields);
 709
 710                         case "reshare":
 711                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 712
 713                         case "retraction":
 714                                 return self::receiveRetraction($importer, $sender, $fields);
 715
 716                         case "status_message":
 717                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 718
 719                         default:
 720                                 logger("Unknown message type ".$type);
 721                                 return false;
 722                 }
 723
 724                 return true;
 725         }
 726
 727         /**
 728          * @brief Checks if a posting is valid and fetches the data fields.
 729          *
 730          * This function does not only check the signature.
 731          * It also does the conversion between the old and the new diaspora format.
 732          *
 733          * @param array $msg Array with the XML, the sender handle and the sender signature
 734          *
 735          * @return bool|array If the posting is valid then an array with an SimpleXML object is returned
 736          */
 737         private static function validPosting($msg)
 738         {
 739                 $data = XML::parseString($msg["message"]);
 740
 741                 if (!is_object($data)) {
 742                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 743                         return false;
 744                 }
 745
 746                 // Is this the new or the old version?
 747                 if ($data->getName() == "XML") {
 748                         $oldXML = true;
 749                         foreach ($data->post->children() as $child) {
 750                                 $element = $child;
 751                         }
 752                 } else {
 753                         $oldXML = false;
 754                         $element = $data;
 755                 }
 756
 757                 $type = $element->getName();
 758                 $orig_type = $type;
 759
 760                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 761
 762                 // All retractions are handled identically from now on.
 763                 // In the new version there will only be "retraction".
 764                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 765                         $type = "retraction";
 766
 767                 if ($type == "request") {
 768                         $type = "contact";
 769                 }
 770
 771                 $fields = new SimpleXMLElement("<".$type."/>");
 772
 773                 $signed_data = "";
 774                 $author_signature = null;
 775                 $parent_author_signature = null;
 776
 777                 foreach ($element->children() as $fieldname => $entry) {
 778                         if ($oldXML) {
 779                                 // Translation for the old XML structure
 780                                 if ($fieldname == "diaspora_handle") {
 781                                         $fieldname = "author";
 782                                 }
 783                                 if ($fieldname == "participant_handles") {
 784                                         $fieldname = "participants";
 785                                 }
 786                                 if (in_array($type, ["like", "participation"])) {
 787                                         if ($fieldname == "target_type") {
 788                                                 $fieldname = "parent_type";
 789                                         }
 790                                 }
 791                                 if ($fieldname == "sender_handle") {
 792                                         $fieldname = "author";
 793                                 }
 794                                 if ($fieldname == "recipient_handle") {
 795                                         $fieldname = "recipient";
 796                                 }
 797                                 if ($fieldname == "root_diaspora_id") {
 798                                         $fieldname = "root_author";
 799                                 }
 800                                 if ($type == "status_message") {
 801                                         if ($fieldname == "raw_message") {
 802                                                 $fieldname = "text";
 803                                         }
 804                                 }
 805                                 if ($type == "retraction") {
 806                                         if ($fieldname == "post_guid") {
 807                                                 $fieldname = "target_guid";
 808                                         }
 809                                         if ($fieldname == "type") {
 810                                                 $fieldname = "target_type";
 811                                         }
 812                                 }
 813                         }
 814
 815                         if (($fieldname == "author_signature") && ($entry != "")) {
 816                                 $author_signature = base64_decode($entry);
 817                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 818                                 $parent_author_signature = base64_decode($entry);
 819                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 820                                 if ($signed_data != "") {
 821                                         $signed_data .= ";";
 822                                 }
 823
 824                                 $signed_data .= $entry;
 825                         }
 826                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 827                                 || ($orig_type == "relayable_retraction")
 828                         ) {
 829                                 XML::copy($entry, $fields, $fieldname);
 830                         }
 831                 }
 832
 833                 // This is something that shouldn't happen at all.
 834                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 835                         if ($msg["author"] != $fields->author) {
 836                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 837                                 return false;
 838                         }
 839                 }
 840
 841                 // Only some message types have signatures. So we quit here for the other types.
 842                 if (!in_array($type, ["comment", "like"])) {
 843                         return ["fields" => $fields, "relayed" => false];
 844                 }
 845                 // No author_signature? This is a must, so we quit.
 846                 if (!isset($author_signature)) {
 847                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 848                         return false;
 849                 }
 850
 851                 if (isset($parent_author_signature)) {
 852                         $relayed = true;
 853
 854                         $key = self::key($msg["author"]);
 855
 856                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 857                                 logger("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 858                                 return false;
 859                         }
 860                 } else {
 861                         $relayed = false;
 862                 }
 863
 864                 $key = self::key($fields->author);
 865
 866                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 867                         logger("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 868                         return false;
 869                 } else {
 870                         return ["fields" => $fields, "relayed" => $relayed];
 871                 }
 872         }
 873
 874         /**
 875          * @brief Fetches the public key for a given handle
 876          *
 877          * @param string $handle The handle
 878          *
 879          * @return string The public key
 880          */
 881         private static function key($handle)
 882         {
 883                 $handle = strval($handle);
 884
 885                 logger("Fetching diaspora key for: ".$handle);
 886
 887                 $r = self::personByHandle($handle);
 888                 if ($r) {
 889                         return $r["pubkey"];
 890                 }
 891
 892                 return "";
 893         }
 894
 895         /**
 896          * @brief Fetches data for a given handle
 897          *
 898          * @param string $handle The handle
 899          *
 900          * @return array the queried data
 901          */
 902         public static function personByHandle($handle)
 903         {
 904                 $update = false;
 905
 906                 $person = dba::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 907                 if (DBM::is_result($person)) {
 908                         logger("In cache " . print_r($person, true), LOGGER_DEBUG);
 909
 910                         // update record occasionally so it doesn't get stale
 911                         $d = strtotime($person["updated"]." +00:00");
 912                         if ($d < strtotime("now - 14 days")) {
 913                                 $update = true;
 914                         }
 915
 916                         if ($person["guid"] == "") {
 917                                 $update = true;
 918                         }
 919                 }
 920
 921                 if (!DBM::is_result($person) || $update) {
 922                         logger("create or refresh", LOGGER_DEBUG);
 923                         $r = Probe::uri($handle, NETWORK_DIASPORA);
 924
 925                         // Note that Friendica contacts will return a "Diaspora person"
 926                         // if Diaspora connectivity is enabled on their server
 927                         if ($r && ($r["network"] === NETWORK_DIASPORA)) {
 928                                 self::addFContact($r, $update);
 929
 930                                 // Fetch the updated or added contact
 931                                 $person = dba::selectFirst('fcontact', [], ['network' => NETWORK_DIASPORA, 'addr' => $handle]);
 932                                 if (!DBM::is_result($person)) {
 933                                         $person = $r;
 934                                 }
 935                         }
 936                 }
 937
 938                 return $person;
 939         }
 940
 941         /**
 942          * @brief Updates the fcontact table
 943          *
 944          * @param array $arr    The fcontact data
 945          * @param bool  $update Update or insert?
 946          *
 947          * @return string The id of the fcontact entry
 948          */
 949         private static function addFContact($arr, $update = false)
 950         {
 951                 if ($update) {
 952                         $r = q(
 953                                 "UPDATE `fcontact` SET
 954                                         `name` = '%s',
 955                                         `photo` = '%s',
 956                                         `request` = '%s',
 957                                         `nick` = '%s',
 958                                         `addr` = '%s',
 959                                         `guid` = '%s',
 960                                         `batch` = '%s',
 961                                         `notify` = '%s',
 962                                         `poll` = '%s',
 963                                         `confirm` = '%s',
 964                                         `alias` = '%s',
 965                                         `pubkey` = '%s',
 966                                         `updated` = '%s'
 967                                 WHERE `url` = '%s' AND `network` = '%s'",
 968                                 dbesc($arr["name"]),
 969                                 dbesc($arr["photo"]),
 970                                 dbesc($arr["request"]),
 971                                 dbesc($arr["nick"]),
 972                                 dbesc(strtolower($arr["addr"])),
 973                                 dbesc($arr["guid"]),
 974                                 dbesc($arr["batch"]),
 975                                 dbesc($arr["notify"]),
 976                                 dbesc($arr["poll"]),
 977                                 dbesc($arr["confirm"]),
 978                                 dbesc($arr["alias"]),
 979                                 dbesc($arr["pubkey"]),
 980                                 dbesc(DateTimeFormat::utcNow()),
 981                                 dbesc($arr["url"]),
 982                                 dbesc($arr["network"])
 983                         );
 984                 } else {
 985                         $r = q(
 986                                 "INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`, `guid`,
 987                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 988                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 989                                 dbesc($arr["url"]),
 990                                 dbesc($arr["name"]),
 991                                 dbesc($arr["photo"]),
 992                                 dbesc($arr["request"]),
 993                                 dbesc($arr["nick"]),
 994                                 dbesc($arr["addr"]),
 995                                 dbesc($arr["guid"]),
 996                                 dbesc($arr["batch"]),
 997                                 dbesc($arr["notify"]),
 998                                 dbesc($arr["poll"]),
 999                                 dbesc($arr["confirm"]),
1000                                 dbesc($arr["network"]),
1001                                 dbesc($arr["alias"]),
1002                                 dbesc($arr["pubkey"]),
1003                                 dbesc(DateTimeFormat::utcNow())
1004                         );
1005                 }
1006
1007                 return $r;
1008         }
1009
1010         /**
1011          * @brief get a handle (user@domain.tld) from a given contact id
1012          *
1013          * @param int $contact_id  The id in the contact table
1014          * @param int $pcontact_id The id in the contact table (Used for the public contact)
1015          *
1016          * @return string the handle
1017          */
1018         private static function handleFromContact($contact_id, $pcontact_id = 0)
1019         {
1020                 $handle = false;
1021
1022                 logger("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, LOGGER_DEBUG);
1023
1024                 if ($pcontact_id != 0) {
1025                         $r = q(
1026                                 "SELECT `addr` FROM `contact` WHERE `id` = %d AND `addr` != ''",
1027                                 intval($pcontact_id)
1028                         );
1029
1030                         if (DBM::is_result($r)) {
1031                                 return strtolower($r[0]["addr"]);
1032                         }
1033                 }
1034
1035                 $r = q(
1036                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1037                         intval($contact_id)
1038                 );
1039
1040                 if (DBM::is_result($r)) {
1041                         $contact = $r[0];
1042
1043                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
1044
1045                         if ($contact['addr'] != "") {
1046                                 $handle = $contact['addr'];
1047                         } else {
1048                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1049                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1050                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1051                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1052                                 $handle = $contact['nick'].'@'.$baseurl;
1053                         }
1054                 }
1055
1056                 return strtolower($handle);
1057         }
1058
1059         /**
1060          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1061          * fcontact guid
1062          *
1063          * @param mixed $fcontact_guid Hexadecimal string guid
1064          *
1065          * @return string the contact url or null
1066          */
1067         public static function urlFromContactGuid($fcontact_guid)
1068         {
1069                 logger("fcontact guid is ".$fcontact_guid, LOGGER_DEBUG);
1070
1071                 $r = q(
1072                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1073                         dbesc(NETWORK_DIASPORA),
1074                         dbesc($fcontact_guid)
1075                 );
1076
1077                 if (DBM::is_result($r)) {
1078                         return $r[0]['url'];
1079                 }
1080
1081                 return null;
1082         }
1083
1084         /**
1085          * @brief Get a contact id for a given handle
1086          *
1087          * @todo Move to Friendica\Model\Contact
1088          *
1089          * @param int    $uid    The user id
1090          * @param string $handle The handle in the format user@domain.tld
1091          *
1092          * @return int Contact id
1093          */
1094         private static function contactByHandle($uid, $handle)
1095         {
1096                 // First do a direct search on the contact table
1097                 $r = q(
1098                         "SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
1099                         intval($uid),
1100                         dbesc($handle)
1101                 );
1102
1103                 if (DBM::is_result($r)) {
1104                         return $r[0];
1105                 } else {
1106                         /*
1107                          * We haven't found it?
1108                          * We use another function for it that will possibly create a contact entry.
1109                          */
1110                         $cid = Contact::getIdForURL($handle, $uid);
1111
1112                         if ($cid > 0) {
1113                                 /// @TODO Contact retrieval should be encapsulated into an "entity" class like `Contact`
1114                                 $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($cid));
1115
1116                                 if (DBM::is_result($r)) {
1117                                         return $r[0];
1118                                 }
1119                         }
1120                 }
1121
1122                 $handle_parts = explode("@", $handle);
1123                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
1124                 $r = q(
1125                         "SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
1126                         dbesc(NETWORK_DFRN),
1127                         intval($uid),
1128                         dbesc($nurl_sql)
1129                 );
1130                 if (DBM::is_result($r)) {
1131                         return $r[0];
1132                 }
1133
1134                 logger("Haven't found contact for user ".$uid." and handle ".$handle, LOGGER_DEBUG);
1135                 return false;
1136         }
1137
1138         /**
1139          * @brief Check if posting is allowed for this contact
1140          *
1141          * @param array $importer   Array of the importer user
1142          * @param array $contact    The contact that is checked
1143          * @param bool  $is_comment Is the check for a comment?
1144          *
1145          * @return bool is the contact allowed to post?
1146          */
1147         private static function postAllow($importer, $contact, $is_comment = false)
1148         {
1149                 /*
1150                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1151                  * That makes us friends.
1152                  * Normally this should have handled by getting a request - but this could get lost
1153                  */
1154                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1155                 // It is not removed by now. Possibly the code is needed?
1156                 //if (!$is_comment && $contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1157                 //      dba::update(
1158                 //              'contact',
1159                 //              array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
1160                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1161                 //      );
1162                 //
1163                 //      $contact["rel"] = CONTACT_IS_FRIEND;
1164                 //      logger("defining user ".$contact["nick"]." as friend");
1165                 //}
1166
1167                 // We don't seem to like that person
1168                 if ($contact["blocked"] || $contact["readonly"]) {
1169                         // Maybe blocked, don't accept.
1170                         return false;
1171                         // We are following this person?
1172                 } elseif (($contact["rel"] == CONTACT_IS_SHARING) || ($contact["rel"] == CONTACT_IS_FRIEND)) {
1173                         // Yes, then it is fine.
1174                         return true;
1175                         // Is it a post to a community?
1176                 } elseif (($contact["rel"] == CONTACT_IS_FOLLOWER) && in_array($importer["page-flags"], [PAGE_COMMUNITY, PAGE_PRVGROUP])) {
1177                         // That's good
1178                         return true;
1179                         // Is the message a global user or a comment?
1180                 } elseif (($importer["uid"] == 0) || $is_comment) {
1181                         // Messages for the global users and comments are always accepted
1182                         return true;
1183                 }
1184
1185                 return false;
1186         }
1187
1188         /**
1189          * @brief Fetches the contact id for a handle and checks if posting is allowed
1190          *
1191          * @param array  $importer   Array of the importer user
1192          * @param string $handle     The checked handle in the format user@domain.tld
1193          * @param bool   $is_comment Is the check for a comment?
1194          *
1195          * @return array The contact data
1196          */
1197         private static function allowedContactByHandle($importer, $handle, $is_comment = false)
1198         {
1199                 $contact = self::contactByHandle($importer["uid"], $handle);
1200                 if (!$contact) {
1201                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1202                         // If a contact isn't found, we accept it anyway if it is a comment
1203                         if ($is_comment) {
1204                                 return $importer;
1205                         } else {
1206                                 return false;
1207                         }
1208                 }
1209
1210                 if (!self::postAllow($importer, $contact, $is_comment)) {
1211                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1212                         return false;
1213                 }
1214                 return $contact;
1215         }
1216
1217         /**
1218          * @brief Does the message already exists on the system?
1219          *
1220          * @param int    $uid  The user id
1221          * @param string $guid The guid of the message
1222          *
1223          * @return int|bool message id if the message already was stored into the system - or false.
1224          */
1225         private static function messageExists($uid, $guid)
1226         {
1227                 $r = q(
1228                         "SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1229                         intval($uid),
1230                         dbesc($guid)
1231                 );
1232
1233                 if (DBM::is_result($r)) {
1234                         logger("message ".$guid." already exists for user ".$uid);
1235                         return $r[0]["id"];
1236                 }
1237
1238                 return false;
1239         }
1240
1241         /**
1242          * @brief Checks for links to posts in a message
1243          *
1244          * @param array $item The item array
1245          * @return void
1246          */
1247         private static function fetchGuid($item)
1248         {
1249                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1250                 preg_replace_callback(
1251                         $expression,
1252                         function ($match) use ($item) {
1253                                 self::fetchGuidSub($match, $item);
1254                         },
1255                         $item["body"]
1256                 );
1257
1258                 preg_replace_callback(
1259                         "&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1260                         function ($match) use ($item) {
1261                                 self::fetchGuidSub($match, $item);
1262                         },
1263                         $item["body"]
1264                 );
1265         }
1266
1267         /**
1268          * @brief Checks for relative /people/* links in an item body to match local
1269          * contacts or prepends the remote host taken from the author link.
1270          *
1271          * @param string $body        The item body to replace links from
1272          * @param string $author_link The author link for missing local contact fallback
1273          *
1274          * @return string the replaced string
1275          */
1276         public static function replacePeopleGuid($body, $author_link)
1277         {
1278                 $return = preg_replace_callback(
1279                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1280                         function ($match) use ($author_link) {
1281                                 // $match
1282                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1283                                 // 1 => '0123456789abcdef'
1284                                 // 2 => 'Foo Bar'
1285                                 $handle = self::urlFromContactGuid($match[1]);
1286
1287                                 if ($handle) {
1288                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1289                                 } else {
1290                                         // No local match, restoring absolute remote URL from author scheme and host
1291                                         $author_url = parse_url($author_link);
1292                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1293                                 }
1294
1295                                 return $return;
1296                         },
1297                         $body
1298                 );
1299
1300                 return $return;
1301         }
1302
1303         /**
1304          * @brief sub function of "fetchGuid" which checks for links in messages
1305          *
1306          * @param array $match array containing a link that has to be checked for a message link
1307          * @param array $item  The item array
1308          * @return void
1309          */
1310         private static function fetchGuidSub($match, $item)
1311         {
1312                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1313                         self::storeByGuid($match[1], $item["owner-link"]);
1314                 }
1315         }
1316
1317         /**
1318          * @brief Fetches an item with a given guid from a given server
1319          *
1320          * @param string $guid   the message guid
1321          * @param string $server The server address
1322          * @param int    $uid    The user id of the user
1323          *
1324          * @return int the message id of the stored message or false
1325          */
1326         private static function storeByGuid($guid, $server, $uid = 0)
1327         {
1328                 $serverparts = parse_url($server);
1329                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1330
1331                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
1332
1333                 $msg = self::message($guid, $server);
1334
1335                 if (!$msg) {
1336                         return false;
1337                 }
1338
1339                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
1340
1341                 // Now call the dispatcher
1342                 return self::dispatchPublic($msg);
1343         }
1344
1345         /**
1346          * @brief Fetches a message from a server
1347          *
1348          * @param string $guid   message guid
1349          * @param string $server The url of the server
1350          * @param int    $level  Endless loop prevention
1351          *
1352          * @return array
1353          *      'message' => The message XML
1354          *      'author' => The author handle
1355          *      'key' => The public key of the author
1356          */
1357         private static function message($guid, $server, $level = 0)
1358         {
1359                 if ($level > 5) {
1360                         return false;
1361                 }
1362
1363                 // This will work for new Diaspora servers and Friendica servers from 3.5
1364                 $source_url = $server."/fetch/post/".urlencode($guid);
1365
1366                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1367
1368                 $envelope = Network::fetchUrl($source_url);
1369                 if ($envelope) {
1370                         logger("Envelope was fetched.", LOGGER_DEBUG);
1371                         $x = self::verifyMagicEnvelope($envelope);
1372                         if (!$x) {
1373                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
1374                         } else {
1375                                 logger("Envelope was verified.", LOGGER_DEBUG);
1376                         }
1377                 } else {
1378                         $x = false;
1379                 }
1380
1381                 // This will work for older Diaspora and Friendica servers
1382                 if (!$x) {
1383                         $source_url = $server."/p/".urlencode($guid).".xml";
1384                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1385
1386                         $x = Network::fetchUrl($source_url);
1387                         if (!$x) {
1388                                 return false;
1389                         }
1390                 }
1391
1392                 $source_xml = XML::parseString($x);
1393
1394                 if (!is_object($source_xml)) {
1395                         return false;
1396                 }
1397
1398                 if ($source_xml->post->reshare) {
1399                         // Reshare of a reshare - old Diaspora version
1400                         logger("Message is a reshare", LOGGER_DEBUG);
1401                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1402                 } elseif ($source_xml->getName() == "reshare") {
1403                         // Reshare of a reshare - new Diaspora version
1404                         logger("Message is a new reshare", LOGGER_DEBUG);
1405                         return self::message($source_xml->root_guid, $server, ++$level);
1406                 }
1407
1408                 $author = "";
1409
1410                 // Fetch the author - for the old and the new Diaspora version
1411                 if ($source_xml->post->status_message->diaspora_handle) {
1412                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1413                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1414                         $author = (string)$source_xml->author;
1415                 }
1416
1417                 // If this isn't a "status_message" then quit
1418                 if (!$author) {
1419                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
1420                         return false;
1421                 }
1422
1423                 $msg = ["message" => $x, "author" => $author];
1424
1425                 $msg["key"] = self::key($msg["author"]);
1426
1427                 return $msg;
1428         }
1429
1430         /**
1431          * @brief Fetches the item record of a given guid
1432          *
1433          * @param int    $uid     The user id
1434          * @param string $guid    message guid
1435          * @param string $author  The handle of the item
1436          * @param array  $contact The contact of the item owner
1437          *
1438          * @return array the item record
1439          */
1440         private static function parentItem($uid, $guid, $author, $contact)
1441         {
1442                 $r = q(
1443                         "SELECT `id`, `parent`, `body`, `wall`, `uri`, `guid`, `private`, `origin`,
1444                                 `author-name`, `author-link`, `author-avatar`,
1445                                 `owner-name`, `owner-link`, `owner-avatar`
1446                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1447                         intval($uid),
1448                         dbesc($guid)
1449                 );
1450
1451                 if (!$r) {
1452                         $result = self::storeByGuid($guid, $contact["url"], $uid);
1453
1454                         if (!$result) {
1455                                 $person = self::personByHandle($author);
1456                                 $result = self::storeByGuid($guid, $person["url"], $uid);
1457                         }
1458
1459                         if ($result) {
1460                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
1461
1462                                 $r = q(
1463                                         "SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
1464                                                 `author-name`, `author-link`, `author-avatar`,
1465                                                 `owner-name`, `owner-link`, `owner-avatar`
1466                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1467                                         intval($uid),
1468                                         dbesc($guid)
1469                                 );
1470                         }
1471                 }
1472
1473                 if (!$r) {
1474                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
1475                         return false;
1476                 } else {
1477                         logger("parent item found: parent: ".$guid." - user: ".$uid);
1478                         return $r[0];
1479                 }
1480         }
1481
1482         /**
1483          * @brief returns contact details
1484          *
1485          * @param array $def_contact The default contact if the person isn't found
1486          * @param array $person      The record of the person
1487          * @param int   $uid         The user id
1488          *
1489          * @return array
1490          *      'cid' => contact id
1491          *      'network' => network type
1492          */
1493         private static function authorContactByUrl($def_contact, $person, $uid)
1494         {
1495                 $condition = ['nurl' => normalise_link($person["url"]), 'uid' => $uid];
1496                 $contact = dba::selectFirst('contact', ['id', 'network'], $condition);
1497                 if (DBM::is_result($contact)) {
1498                         $cid = $contact["id"];
1499                         $network = $contact["network"];
1500                 } else {
1501                         $cid = $def_contact["id"];
1502                         $network = NETWORK_DIASPORA;
1503                 }
1504
1505                 return ["cid" => $cid, "network" => $network];
1506         }
1507
1508         /**
1509          * @brief Is the profile a hubzilla profile?
1510          *
1511          * @param string $url The profile link
1512          *
1513          * @return bool is it a hubzilla server?
1514          */
1515         public static function isRedmatrix($url)
1516         {
1517                 return(strstr($url, "/channel/"));
1518         }
1519
1520         /**
1521          * @brief Generate a post link with a given handle and message guid
1522          *
1523          * @param string $addr        The user handle
1524          * @param string $guid        message guid
1525          * @param string $parent_guid optional parent guid
1526          *
1527          * @return string the post link
1528          */
1529         private static function plink($addr, $guid, $parent_guid = '')
1530         {
1531                 $contact = Contact::getDetailsByAddr($addr);
1532
1533                 // Fallback
1534                 if (!$contact) {
1535                         if ($parent_guid != '') {
1536                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1537                         } else {
1538                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1539                         }
1540                 }
1541
1542                 if ($contact["network"] == NETWORK_DFRN) {
1543                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1544                 }
1545
1546                 if (self::isRedmatrix($contact["url"])) {
1547                         return $contact["url"] . "/?f=&mid=" . $guid;
1548                 }
1549
1550                 if ($parent_guid != '') {
1551                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1552                 } else {
1553                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1554                 }
1555         }
1556
1557         /**
1558          * @brief Receives account migration
1559          *
1560          * @param array  $importer Array of the importer user
1561          * @param object $data     The message object
1562          *
1563          * @return bool Success
1564          */
1565         private static function receiveAccountMigration($importer, $data)
1566         {
1567                 $old_handle = notags(unxmlify($data->author));
1568                 $new_handle = notags(unxmlify($data->profile->author));
1569                 $signature = notags(unxmlify($data->signature));
1570
1571                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1572                 if (!$contact) {
1573                         logger("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1574                         return false;
1575                 }
1576
1577                 logger("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1578
1579                 // Check signature
1580                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1581                 $key = self::key($old_handle);
1582                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1583                         logger('No valid signature for migration.');
1584                         return false;
1585                 }
1586
1587                 // Update the profile
1588                 self::receiveProfile($importer, $data->profile);
1589
1590                 // change the technical stuff in contact and gcontact
1591                 $data = Probe::uri($new_handle);
1592                 if ($data['network'] == NETWORK_PHANTOM) {
1593                         logger('Account for '.$new_handle." couldn't be probed.");
1594                         return false;
1595                 }
1596
1597                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1598                                 'name' => $data['name'], 'nick' => $data['nick'],
1599                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1600                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1601                                 'network' => $data['network']];
1602
1603                 dba::update('contact', $fields, ['addr' => $old_handle]);
1604
1605                 $fields = ['url' => $data['url'], 'nurl' => normalise_link($data['url']),
1606                                 'name' => $data['name'], 'nick' => $data['nick'],
1607                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1608                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1609                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1610
1611                 dba::update('gcontact', $fields, ['addr' => $old_handle]);
1612
1613                 logger('Contacts are updated.');
1614
1615                 // update items
1616                 /// @todo This is an extreme performance killer
1617                 $fields = [
1618                         'owner-link' => [$contact["url"], $data["url"]],
1619                         'author-link' => [$contact["url"], $data["url"]],
1620                 ];
1621                 foreach ($fields as $n => $f) {
1622                         $r = q(
1623                                 "SELECT `id` FROM `item` WHERE `%s` = '%s' AND `uid` = %d LIMIT 1",
1624                                 $n,
1625                                 dbesc($f[0]),
1626                                 intval($importer["uid"])
1627                         );
1628
1629                         if (DBM::is_result($r)) {
1630                                 $x = q(
1631                                         "UPDATE `item` SET `%s` = '%s' WHERE `%s` = '%s' AND `uid` = %d",
1632                                         $n,
1633                                         dbesc($f[1]),
1634                                         $n,
1635                                         dbesc($f[0]),
1636                                         intval($importer["uid"])
1637                                 );
1638
1639                                 if ($x === false) {
1640                                         return false;
1641                                 }
1642                         }
1643                 }
1644
1645                 logger('Items are updated.');
1646
1647                 return true;
1648         }
1649
1650         /**
1651          * @brief Processes an account deletion
1652          *
1653          * @param array  $importer Array of the importer user
1654          * @param object $data     The message object
1655          *
1656          * @return bool Success
1657          */
1658         private static function receiveAccountDeletion($importer, $data)
1659         {
1660                 /// @todo Account deletion should remove the contact from the global contacts as well
1661
1662                 $author = notags(unxmlify($data->author));
1663
1664                 $contact = self::contactByHandle($importer["uid"], $author);
1665                 if (!$contact) {
1666                         logger("cannot find contact for author: ".$author);
1667                         return false;
1668                 }
1669
1670                 // We now remove the contact
1671                 Contact::remove($contact["id"]);
1672                 return true;
1673         }
1674
1675         /**
1676          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1677          *
1678          * @param string  $author    Author handle
1679          * @param string  $guid      Message guid
1680          * @param boolean $onlyfound Only return uri when found in the database
1681          *
1682          * @return string The constructed uri or the one from our database
1683          */
1684         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1685         {
1686                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1687                 if (DBM::is_result($r)) {
1688                         return $r[0]["uri"];
1689                 } elseif (!$onlyfound) {
1690                         return $author.":".$guid;
1691                 }
1692
1693                 return "";
1694         }
1695
1696         /**
1697          * @brief Fetch the guid from our database with a given uri
1698          *
1699          * @param string $uri Message uri
1700          * @param string $uid Author handle
1701          *
1702          * @return string The post guid
1703          */
1704         private static function getGuidFromUri($uri, $uid)
1705         {
1706                 $r = q("SELECT `guid` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($uri), intval($uid));
1707                 if (DBM::is_result($r)) {
1708                         return $r[0]["guid"];
1709                 } else {
1710                         return false;
1711                 }
1712         }
1713
1714         /**
1715          * @brief Find the best importer for a comment, like, ...
1716          *
1717          * @param string $guid The guid of the item
1718          *
1719          * @return array|boolean the origin owner of that post - or false
1720          */
1721         private static function importerForGuid($guid)
1722         {
1723                 $item = dba::fetch_first("SELECT `uid` FROM `item` WHERE `origin` AND `guid` = ? LIMIT 1", $guid);
1724
1725                 if (DBM::is_result($item)) {
1726                         logger("Found user ".$item['uid']." as owner of item ".$guid, LOGGER_DEBUG);
1727                         $contact = dba::fetch_first("SELECT * FROM `contact` WHERE `self` AND `uid` = ?", $item['uid']);
1728                         if (DBM::is_result($contact)) {
1729                                 return $contact;
1730                         }
1731                 }
1732                 return false;
1733         }
1734
1735         /**
1736          * @brief Processes an incoming comment
1737          *
1738          * @param array  $importer Array of the importer user
1739          * @param string $sender   The sender of the message
1740          * @param object $data     The message object
1741          * @param string $xml      The original XML of the message
1742          *
1743          * @return int The message id of the generated comment or "false" if there was an error
1744          */
1745         private static function receiveComment($importer, $sender, $data, $xml)
1746         {
1747                 $author = notags(unxmlify($data->author));
1748                 $guid = notags(unxmlify($data->guid));
1749                 $parent_guid = notags(unxmlify($data->parent_guid));
1750                 $text = unxmlify($data->text);
1751
1752                 if (isset($data->created_at)) {
1753                         $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1754                 } else {
1755                         $created_at = DateTimeFormat::utcNow();
1756                 }
1757
1758                 if (isset($data->thread_parent_guid)) {
1759                         $thread_parent_guid = notags(unxmlify($data->thread_parent_guid));
1760                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1761                 } else {
1762                         $thr_uri = "";
1763                 }
1764
1765                 $contact = self::allowedContactByHandle($importer, $sender, true);
1766                 if (!$contact) {
1767                         return false;
1768                 }
1769
1770                 $message_id = self::messageExists($importer["uid"], $guid);
1771                 if ($message_id) {
1772                         return true;
1773                 }
1774
1775                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1776                 if (!$parent_item) {
1777                         return false;
1778                 }
1779
1780                 $person = self::personByHandle($author);
1781                 if (!is_array($person)) {
1782                         logger("unable to find author details");
1783                         return false;
1784                 }
1785
1786                 // Fetch the contact id - if we know this contact
1787                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1788
1789                 $datarray = [];
1790
1791                 $datarray["uid"] = $importer["uid"];
1792                 $datarray["contact-id"] = $author_contact["cid"];
1793                 $datarray["network"]  = $author_contact["network"];
1794
1795                 $datarray["author-name"] = $person["name"];
1796                 $datarray["author-link"] = $person["url"];
1797                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
1798
1799                 $datarray["owner-name"] = $contact["name"];
1800                 $datarray["owner-link"] = $contact["url"];
1801                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
1802
1803                 $datarray["guid"] = $guid;
1804                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1805
1806                 $datarray["type"] = "remote-comment";
1807                 $datarray["verb"] = ACTIVITY_POST;
1808                 $datarray["gravity"] = GRAVITY_COMMENT;
1809
1810                 if ($thr_uri != "") {
1811                         $datarray["parent-uri"] = $thr_uri;
1812                 } else {
1813                         $datarray["parent-uri"] = $parent_item["uri"];
1814                 }
1815
1816                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1817
1818                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1819                 $datarray["source"] = $xml;
1820
1821                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1822
1823                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1824
1825                 $body = Markdown::toBBCode($text);
1826
1827                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1828
1829                 self::fetchGuid($datarray);
1830
1831                 $message_id = Item::insert($datarray);
1832
1833                 if ($message_id <= 0) {
1834                         return false;
1835                 }
1836
1837                 if ($message_id) {
1838                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1839                 }
1840
1841                 // If we are the origin of the parent we store the original data and notify our followers
1842                 if ($message_id && $parent_item["origin"]) {
1843                         // Formerly we stored the signed text, the signature and the author in different fields.
1844                         // We now store the raw data so that we are more flexible.
1845                         dba::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($data)]);
1846
1847                         // notify others
1848                         Worker::add(PRIORITY_HIGH, "Notifier", "comment-import", $message_id);
1849                 }
1850
1851                 return true;
1852         }
1853
1854         /**
1855          * @brief processes and stores private messages
1856          *
1857          * @param array  $importer     Array of the importer user
1858          * @param array  $contact      The contact of the message
1859          * @param object $data         The message object
1860          * @param array  $msg          Array of the processed message, author handle and key
1861          * @param object $mesg         The private message
1862          * @param array  $conversation The conversation record to which this message belongs
1863          *
1864          * @return bool "true" if it was successful
1865          */
1866         private static function receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation)
1867         {
1868                 $author = notags(unxmlify($data->author));
1869                 $guid = notags(unxmlify($data->guid));
1870                 $subject = notags(unxmlify($data->subject));
1871
1872                 // "diaspora_handle" is the element name from the old version
1873                 // "author" is the element name from the new version
1874                 if ($mesg->author) {
1875                         $msg_author = notags(unxmlify($mesg->author));
1876                 } elseif ($mesg->diaspora_handle) {
1877                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1878                 } else {
1879                         return false;
1880                 }
1881
1882                 $msg_guid = notags(unxmlify($mesg->guid));
1883                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1884                 $msg_text = unxmlify($mesg->text);
1885                 $msg_created_at = DateTimeFormat::utc(notags(unxmlify($mesg->created_at)));
1886
1887                 if ($msg_conversation_guid != $guid) {
1888                         logger("message conversation guid does not belong to the current conversation.");
1889                         return false;
1890                 }
1891
1892                 $body = Markdown::toBBCode($msg_text);
1893                 $message_uri = $msg_author.":".$msg_guid;
1894
1895                 $person = self::personByHandle($msg_author);
1896
1897                 dba::lock('mail');
1898
1899                 $r = q(
1900                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1901                         dbesc($msg_guid),
1902                         intval($importer["uid"])
1903                 );
1904                 if (DBM::is_result($r)) {
1905                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1906                         return false;
1907                 }
1908
1909                 q(
1910                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1911                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1912                         intval($importer["uid"]),
1913                         dbesc($msg_guid),
1914                         intval($conversation["id"]),
1915                         dbesc($person["name"]),
1916                         dbesc($person["photo"]),
1917                         dbesc($person["url"]),
1918                         intval($contact["id"]),
1919                         dbesc($subject),
1920                         dbesc($body),
1921                         0,
1922                         0,
1923                         dbesc($message_uri),
1924                         dbesc($author.":".$guid),
1925                         dbesc($msg_created_at)
1926                 );
1927
1928                 dba::unlock();
1929
1930                 dba::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
1931
1932                 notification(
1933                         [
1934                         "type" => NOTIFY_MAIL,
1935                         "notify_flags" => $importer["notify-flags"],
1936                         "language" => $importer["language"],
1937                         "to_name" => $importer["username"],
1938                         "to_email" => $importer["email"],
1939                         "uid" =>$importer["uid"],
1940                         "item" => ["subject" => $subject, "body" => $body],
1941                         "source_name" => $person["name"],
1942                         "source_link" => $person["url"],
1943                         "source_photo" => $person["thumb"],
1944                         "verb" => ACTIVITY_POST,
1945                         "otype" => "mail"]
1946                 );
1947                 return true;
1948         }
1949
1950         /**
1951          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1952          *
1953          * @param array  $importer Array of the importer user
1954          * @param array  $msg      Array of the processed message, author handle and key
1955          * @param object $data     The message object
1956          *
1957          * @return bool Success
1958          */
1959         private static function receiveConversation($importer, $msg, $data)
1960         {
1961                 $author = notags(unxmlify($data->author));
1962                 $guid = notags(unxmlify($data->guid));
1963                 $subject = notags(unxmlify($data->subject));
1964                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
1965                 $participants = notags(unxmlify($data->participants));
1966
1967                 $messages = $data->message;
1968
1969                 if (!count($messages)) {
1970                         logger("empty conversation");
1971                         return false;
1972                 }
1973
1974                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1975                 if (!$contact) {
1976                         return false;
1977                 }
1978
1979                 $conversation = null;
1980
1981                 $c = q(
1982                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1983                         intval($importer["uid"]),
1984                         dbesc($guid)
1985                 );
1986                 if ($c)
1987                         $conversation = $c[0];
1988                 else {
1989                         $r = q(
1990                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1991                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1992                                 intval($importer["uid"]),
1993                                 dbesc($guid),
1994                                 dbesc($author),
1995                                 dbesc($created_at),
1996                                 dbesc(DateTimeFormat::utcNow()),
1997                                 dbesc($subject),
1998                                 dbesc($participants)
1999                         );
2000                         if ($r) {
2001                                 $c = q(
2002                                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
2003                                         intval($importer["uid"]),
2004                                         dbesc($guid)
2005                                 );
2006                         }
2007
2008                         if ($c) {
2009                                 $conversation = $c[0];
2010                         }
2011                 }
2012                 if (!$conversation) {
2013                         logger("unable to create conversation.");
2014                         return false;
2015                 }
2016
2017                 foreach ($messages as $mesg) {
2018                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
2019                 }
2020
2021                 return true;
2022         }
2023
2024         /**
2025          * @brief Creates the body for a "like" message
2026          *
2027          * @param array  $contact     The contact that send us the "like"
2028          * @param array  $parent_item The item array of the parent item
2029          * @param string $guid        message guid
2030          *
2031          * @return string the body
2032          */
2033         private static function constructLikeBody($contact, $parent_item, $guid)
2034         {
2035                 $bodyverb = L10n::t('%1$s likes %2$s\'s %3$s');
2036
2037                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
2038                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
2039                 $plink = "[url=".System::baseUrl()."/display/".urlencode($guid)."]".L10n::t("status")."[/url]";
2040
2041                 return sprintf($bodyverb, $ulink, $alink, $plink);
2042         }
2043
2044         /**
2045          * @brief Creates a XML object for a "like"
2046          *
2047          * @param array $importer    Array of the importer user
2048          * @param array $parent_item The item array of the parent item
2049          *
2050          * @return string The XML
2051          */
2052         private static function constructLikeObject($importer, $parent_item)
2053         {
2054                 $objtype = ACTIVITY_OBJ_NOTE;
2055                 $link = '<link rel="alternate" type="text/html" href="'.System::baseUrl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
2056                 $parent_body = $parent_item["body"];
2057
2058                 $xmldata = ["object" => ["type" => $objtype,
2059                                                 "local" => "1",
2060                                                 "id" => $parent_item["uri"],
2061                                                 "link" => $link,
2062                                                 "title" => "",
2063                                                 "content" => $parent_body]];
2064
2065                 return XML::fromArray($xmldata, $xml, true);
2066         }
2067
2068         /**
2069          * @brief Processes "like" messages
2070          *
2071          * @param array  $importer Array of the importer user
2072          * @param string $sender   The sender of the message
2073          * @param object $data     The message object
2074          *
2075          * @return int The message id of the generated like or "false" if there was an error
2076          */
2077         private static function receiveLike($importer, $sender, $data)
2078         {
2079                 $author = notags(unxmlify($data->author));
2080                 $guid = notags(unxmlify($data->guid));
2081                 $parent_guid = notags(unxmlify($data->parent_guid));
2082                 $parent_type = notags(unxmlify($data->parent_type));
2083                 $positive = notags(unxmlify($data->positive));
2084
2085                 // likes on comments aren't supported by Diaspora - only on posts
2086                 // But maybe this will be supported in the future, so we will accept it.
2087                 if (!in_array($parent_type, ["Post", "Comment"])) {
2088                         return false;
2089                 }
2090
2091                 $contact = self::allowedContactByHandle($importer, $sender, true);
2092                 if (!$contact) {
2093                         return false;
2094                 }
2095
2096                 $message_id = self::messageExists($importer["uid"], $guid);
2097                 if ($message_id) {
2098                         return true;
2099                 }
2100
2101                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
2102                 if (!$parent_item) {
2103                         return false;
2104                 }
2105
2106                 $person = self::personByHandle($author);
2107                 if (!is_array($person)) {
2108                         logger("unable to find author details");
2109                         return false;
2110                 }
2111
2112                 // Fetch the contact id - if we know this contact
2113                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2114
2115                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2116                 // We would accept this anyhow.
2117                 if ($positive == "true") {
2118                         $verb = ACTIVITY_LIKE;
2119                 } else {
2120                         $verb = ACTIVITY_DISLIKE;
2121                 }
2122
2123                 $datarray = [];
2124
2125                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2126
2127                 $datarray["uid"] = $importer["uid"];
2128                 $datarray["contact-id"] = $author_contact["cid"];
2129                 $datarray["network"]  = $author_contact["network"];
2130
2131                 $datarray["author-name"] = $person["name"];
2132                 $datarray["author-link"] = $person["url"];
2133                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
2134
2135                 $datarray["owner-name"] = $contact["name"];
2136                 $datarray["owner-link"] = $contact["url"];
2137                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2138
2139                 $datarray["guid"] = $guid;
2140                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2141
2142                 $datarray["type"] = "activity";
2143                 $datarray["verb"] = $verb;
2144                 $datarray["gravity"] = GRAVITY_LIKE;
2145                 $datarray["parent-uri"] = $parent_item["uri"];
2146
2147                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2148                 $datarray["object"] = self::constructLikeObject($importer, $parent_item);
2149
2150                 $datarray["body"] = self::constructLikeBody($contact, $parent_item, $guid);
2151
2152                 $message_id = Item::insert($datarray);
2153
2154                 if ($message_id <= 0) {
2155                         return false;
2156                 }
2157
2158                 if ($message_id) {
2159                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2160                 }
2161
2162                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2163                 if ($parent_item["id"] != $parent_item["parent"]) {
2164                         $toplevel = dba::selectFirst('item', ['origin'], ['id' => $parent_item["parent"]]);
2165                         $origin = $toplevel["origin"];
2166                 } else {
2167                         $origin = $parent_item["origin"];
2168                 }
2169
2170                 // If we are the origin of the parent we store the original data and notify our followers
2171                 if ($message_id && $origin) {
2172                         // Formerly we stored the signed text, the signature and the author in different fields.
2173                         // We now store the raw data so that we are more flexible.
2174                         dba::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($data)]);
2175
2176                         // notify others
2177                         Worker::add(PRIORITY_HIGH, "Notifier", "comment-import", $message_id);
2178                 }
2179
2180                 return true;
2181         }
2182
2183         /**
2184          * @brief Processes private messages
2185          *
2186          * @param array  $importer Array of the importer user
2187          * @param object $data     The message object
2188          *
2189          * @return bool Success?
2190          */
2191         private static function receiveMessage($importer, $data)
2192         {
2193                 $author = notags(unxmlify($data->author));
2194                 $guid = notags(unxmlify($data->guid));
2195                 $conversation_guid = notags(unxmlify($data->conversation_guid));
2196                 $text = unxmlify($data->text);
2197                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2198
2199                 $contact = self::allowedContactByHandle($importer, $author, true);
2200                 if (!$contact) {
2201                         return false;
2202                 }
2203
2204                 $conversation = null;
2205
2206                 $c = q(
2207                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
2208                         intval($importer["uid"]),
2209                         dbesc($conversation_guid)
2210                 );
2211                 if ($c) {
2212                         $conversation = $c[0];
2213                 } else {
2214                         logger("conversation not available.");
2215                         return false;
2216                 }
2217
2218                 $message_uri = $author.":".$guid;
2219
2220                 $person = self::personByHandle($author);
2221                 if (!$person) {
2222                         logger("unable to find author details");
2223                         return false;
2224                 }
2225
2226                 $body = Markdown::toBBCode($text);
2227
2228                 $body = self::replacePeopleGuid($body, $person["url"]);
2229
2230                 dba::lock('mail');
2231
2232                 $r = q(
2233                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
2234                         dbesc($guid),
2235                         intval($importer["uid"])
2236                 );
2237                 if (DBM::is_result($r)) {
2238                         logger("duplicate message already delivered.", LOGGER_DEBUG);
2239                         return false;
2240                 }
2241
2242                 q(
2243                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
2244                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
2245                         intval($importer["uid"]),
2246                         dbesc($guid),
2247                         intval($conversation["id"]),
2248                         dbesc($person["name"]),
2249                         dbesc($person["photo"]),
2250                         dbesc($person["url"]),
2251                         intval($contact["id"]),
2252                         dbesc($conversation["subject"]),
2253                         dbesc($body),
2254                         0,
2255                         1,
2256                         dbesc($message_uri),
2257                         dbesc($author.":".$conversation["guid"]),
2258                         dbesc($created_at)
2259                 );
2260
2261                 dba::unlock();
2262
2263                 dba::update('conv', ['updated' => DateTimeFormat::utcNow()], ['id' => $conversation["id"]]);
2264                 return true;
2265         }
2266
2267         /**
2268          * @brief Processes participations - unsupported by now
2269          *
2270          * @param array  $importer Array of the importer user
2271          * @param object $data     The message object
2272          *
2273          * @return bool always true
2274          */
2275         private static function receiveParticipation($importer, $data)
2276         {
2277                 $author = strtolower(notags(unxmlify($data->author)));
2278                 $parent_guid = notags(unxmlify($data->parent_guid));
2279
2280                 $contact_id = Contact::getIdForURL($author);
2281                 if (!$contact_id) {
2282                         logger('Contact not found: '.$author);
2283                         return false;
2284                 }
2285
2286                 $person = self::personByHandle($author);
2287                 if (!is_array($person)) {
2288                         logger("Person not found: ".$author);
2289                         return false;
2290                 }
2291
2292                 $item = dba::selectFirst('item', ['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2293                 if (!DBM::is_result($item)) {
2294                         logger('Item not found, no origin or private: '.$parent_guid);
2295                         return false;
2296                 }
2297
2298                 $author_parts = explode('@', $author);
2299                 if (isset($author_parts[1])) {
2300                         $server = $author_parts[1];
2301                 } else {
2302                         // Should never happen
2303                         $server = $author;
2304                 }
2305
2306                 logger('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, LOGGER_DEBUG);
2307
2308                 if (!dba::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2309                         dba::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2310                 }
2311
2312                 // Send all existing comments and likes to the requesting server
2313                 $comments = dba::p("SELECT `item`.`id`, `item`.`verb`, `contact`.`self`
2314                                 FROM `item`
2315                                 INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2316                                 WHERE `item`.`parent` = ? AND `item`.`id` != `item`.`parent`", $item['id']);
2317                 while ($comment = dba::fetch($comments)) {
2318                         if ($comment['verb'] == ACTIVITY_POST) {
2319                                 $cmd = $comment['self'] ? 'comment-new' : 'comment-import';
2320                         } else {
2321                                 $cmd = $comment['self'] ? 'like' : 'comment-import';
2322                         }
2323                         logger("Send ".$cmd." for item ".$comment['id']." to contact ".$contact_id, LOGGER_DEBUG);
2324                         Worker::add(PRIORITY_HIGH, 'Delivery', $cmd, $comment['id'], $contact_id);
2325                 }
2326                 dba::close($comments);
2327
2328                 return true;
2329         }
2330
2331         /**
2332          * @brief Processes photos - unneeded
2333          *
2334          * @param array  $importer Array of the importer user
2335          * @param object $data     The message object
2336          *
2337          * @return bool always true
2338          */
2339         private static function receivePhoto($importer, $data)
2340         {
2341                 // There doesn't seem to be a reason for this function,
2342                 // since the photo data is transmitted in the status message as well
2343                 return true;
2344         }
2345
2346         /**
2347          * @brief Processes poll participations - unssupported
2348          *
2349          * @param array  $importer Array of the importer user
2350          * @param object $data     The message object
2351          *
2352          * @return bool always true
2353          */
2354         private static function receivePollParticipation($importer, $data)
2355         {
2356                 // We don't support polls by now
2357                 return true;
2358         }
2359
2360         /**
2361          * @brief Processes incoming profile updates
2362          *
2363          * @param array  $importer Array of the importer user
2364          * @param object $data     The message object
2365          *
2366          * @return bool Success
2367          */
2368         private static function receiveProfile($importer, $data)
2369         {
2370                 $author = strtolower(notags(unxmlify($data->author)));
2371
2372                 $contact = self::contactByHandle($importer["uid"], $author);
2373                 if (!$contact) {
2374                         return false;
2375                 }
2376
2377                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
2378                 $image_url = unxmlify($data->image_url);
2379                 $birthday = unxmlify($data->birthday);
2380                 $gender = unxmlify($data->gender);
2381                 $about = Markdown::toBBCode(unxmlify($data->bio));
2382                 $location = Markdown::toBBCode(unxmlify($data->location));
2383                 $searchable = (unxmlify($data->searchable) == "true");
2384                 $nsfw = (unxmlify($data->nsfw) == "true");
2385                 $tags = unxmlify($data->tag_string);
2386
2387                 $tags = explode("#", $tags);
2388
2389                 $keywords = [];
2390                 foreach ($tags as $tag) {
2391                         $tag = trim(strtolower($tag));
2392                         if ($tag != "") {
2393                                 $keywords[] = $tag;
2394                         }
2395                 }
2396
2397                 $keywords = implode(", ", $keywords);
2398
2399                 $handle_parts = explode("@", $author);
2400                 $nick = $handle_parts[0];
2401
2402                 if ($name === "") {
2403                         $name = $handle_parts[0];
2404                 }
2405
2406                 if (preg_match("|^https?://|", $image_url) === 0) {
2407                         $image_url = "http://".$handle_parts[1].$image_url;
2408                 }
2409
2410                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2411
2412                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2413
2414                 $birthday = str_replace("1000", "1901", $birthday);
2415
2416                 if ($birthday != "") {
2417                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2418                 }
2419
2420                 // this is to prevent multiple birthday notifications in a single year
2421                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2422
2423                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2424                         $birthday = $contact["bd"];
2425                 }
2426
2427                 $r = q(
2428                         "UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
2429                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
2430                         dbesc($name),
2431                         dbesc($nick),
2432                         dbesc($author),
2433                         dbesc(DateTimeFormat::utcNow()),
2434                         dbesc($birthday),
2435                         dbesc($location),
2436                         dbesc($about),
2437                         dbesc($keywords),
2438                         dbesc($gender),
2439                         intval($contact["id"]),
2440                         intval($importer["uid"])
2441                 );
2442
2443                 $gcontact = ["url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
2444                                         "photo" => $image_url, "name" => $name, "location" => $location,
2445                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2446                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2447                                         "hide" => !$searchable, "nsfw" => $nsfw];
2448
2449                 $gcid = GContact::update($gcontact);
2450
2451                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2452
2453                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
2454
2455                 return true;
2456         }
2457
2458         /**
2459          * @brief Processes incoming friend requests
2460          *
2461          * @param array $importer Array of the importer user
2462          * @param array $contact  The contact that send the request
2463          * @return void
2464          */
2465         private static function receiveRequestMakeFriend($importer, $contact)
2466         {
2467                 $a = get_app();
2468
2469                 if ($contact["rel"] == CONTACT_IS_SHARING) {
2470                         dba::update(
2471                                 'contact',
2472                                 ['rel' => CONTACT_IS_FRIEND, 'writable' => true],
2473                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2474                         );
2475                 }
2476                 // send notification
2477
2478                 $r = q(
2479                         "SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
2480                         intval($importer["uid"])
2481                 );
2482
2483                 if ($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(PConfig::get($importer["uid"], "system", "post_newfriend"))) {
2484                         $self = q(
2485                                 "SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
2486                                 intval($importer["uid"])
2487                         );
2488
2489                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
2490
2491                         if ($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
2492                                 $arr = [];
2493                                 $arr["protocol"] = PROTOCOL_DIASPORA;
2494                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
2495                                 $arr["uid"] = $importer["uid"];
2496                                 $arr["contact-id"] = $self[0]["id"];
2497                                 $arr["wall"] = 1;
2498                                 $arr["type"] = 'wall';
2499                                 $arr["gravity"] = 0;
2500                                 $arr["origin"] = 1;
2501                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
2502                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
2503                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
2504                                 $arr["verb"] = ACTIVITY_FRIEND;
2505                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
2506
2507                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
2508                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
2509                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
2510                                 $arr["body"] = L10n::t('%1$s is now friends with %2$s', $A, $B)."\n\n\n".$BPhoto;
2511
2512                                 $arr["object"] = self::constructNewFriendObject($contact);
2513
2514                                 $user = dba::selectFirst('user', ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'], ['uid' => $importer["uid"]]);
2515
2516                                 $arr["allow_cid"] = $user["allow_cid"];
2517                                 $arr["allow_gid"] = $user["allow_gid"];
2518                                 $arr["deny_cid"]  = $user["deny_cid"];
2519                                 $arr["deny_gid"]  = $user["deny_gid"];
2520
2521                                 $i = Item::insert($arr);
2522                                 if ($i) {
2523                                         Worker::add(PRIORITY_HIGH, "Notifier", "activity", $i);
2524                                 }
2525                         }
2526                 }
2527         }
2528
2529         /**
2530          * @brief Creates a XML object for a "new friend" message
2531          *
2532          * @param array $contact Array of the contact
2533          *
2534          * @return string The XML
2535          */
2536         private static function constructNewFriendObject($contact)
2537         {
2538                 $objtype = ACTIVITY_OBJ_PERSON;
2539                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
2540                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
2541
2542                 $xmldata = ["object" => ["type" => $objtype,
2543                                                 "title" => $contact["name"],
2544                                                 "id" => $contact["url"]."/".$contact["name"],
2545                                                 "link" => $link]];
2546
2547                 return XML::fromArray($xmldata, $xml, true);
2548         }
2549
2550         /**
2551          * @brief Processes incoming sharing notification
2552          *
2553          * @param array  $importer Array of the importer user
2554          * @param object $data     The message object
2555          *
2556          * @return bool Success
2557          */
2558         private static function receiveContactRequest($importer, $data)
2559         {
2560                 $author = unxmlify($data->author);
2561                 $recipient = unxmlify($data->recipient);
2562
2563                 if (!$author || !$recipient) {
2564                         return false;
2565                 }
2566
2567                 // the current protocol version doesn't know these fields
2568                 // That means that we will assume their existance
2569                 if (isset($data->following)) {
2570                         $following = (unxmlify($data->following) == "true");
2571                 } else {
2572                         $following = true;
2573                 }
2574
2575                 if (isset($data->sharing)) {
2576                         $sharing = (unxmlify($data->sharing) == "true");
2577                 } else {
2578                         $sharing = true;
2579                 }
2580
2581                 $contact = self::contactByHandle($importer["uid"], $author);
2582
2583                 // perhaps we were already sharing with this person. Now they're sharing with us.
2584                 // That makes us friends.
2585                 if ($contact) {
2586                         if ($following) {
2587                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", LOGGER_DEBUG);
2588                                 self::receiveRequestMakeFriend($importer, $contact);
2589
2590                                 // refetch the contact array
2591                                 $contact = self::contactByHandle($importer["uid"], $author);
2592
2593                                 // If we are now friends, we are sending a share message.
2594                                 // Normally we needn't to do so, but the first message could have been vanished.
2595                                 if (in_array($contact["rel"], [CONTACT_IS_FRIEND])) {
2596                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2597                                         if ($u) {
2598                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2599                                                 $ret = self::sendShare($u[0], $contact);
2600                                         }
2601                                 }
2602                                 return true;
2603                         } else {
2604                                 logger("Author ".$author." doesn't want to follow us anymore.", LOGGER_DEBUG);
2605                                 Contact::removeFollower($importer, $contact);
2606                                 return true;
2607                         }
2608                 }
2609
2610                 if (!$following && $sharing && in_array($importer["page-flags"], [PAGE_SOAPBOX, PAGE_NORMAL])) {
2611                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2612                         return false;
2613                 } elseif (!$following && !$sharing) {
2614                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2615                         return false;
2616                 } elseif (!$following && $sharing) {
2617                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2618                 } elseif ($following && $sharing) {
2619                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2620                 } elseif ($following && !$sharing) {
2621                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2622                 }
2623
2624                 $ret = self::personByHandle($author);
2625
2626                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2627                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2628                         return false;
2629                 }
2630
2631                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2632
2633                 $r = q(
2634                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2635                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2636                         intval($importer["uid"]),
2637                         dbesc($ret["network"]),
2638                         dbesc($ret["addr"]),
2639                         DateTimeFormat::utcNow(),
2640                         dbesc($ret["url"]),
2641                         dbesc(normalise_link($ret["url"])),
2642                         dbesc($batch),
2643                         dbesc($ret["name"]),
2644                         dbesc($ret["nick"]),
2645                         dbesc($ret["photo"]),
2646                         dbesc($ret["pubkey"]),
2647                         dbesc($ret["notify"]),
2648                         dbesc($ret["poll"]),
2649                         1,
2650                         2
2651                 );
2652
2653                 // find the contact record we just created
2654
2655                 $contact_record = self::contactByHandle($importer["uid"], $author);
2656
2657                 if (!$contact_record) {
2658                         logger("unable to locate newly created contact record.");
2659                         return;
2660                 }
2661
2662                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2663
2664                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2665
2666                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2667
2668                 if (in_array($importer["page-flags"], [PAGE_NORMAL, PAGE_PRVGROUP])) {
2669                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2670
2671                         $hash = random_string().(string)time();   // Generate a confirm_key
2672
2673                         $ret = q(
2674                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2675                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2676                                 intval($importer["uid"]),
2677                                 intval($contact_record["id"]),
2678                                 0,
2679                                 0,
2680                                 dbesc(L10n::t("Sharing notification from Diaspora network")),
2681                                 dbesc($hash),
2682                                 dbesc(DateTimeFormat::utcNow())
2683                         );
2684                 } else {
2685                         // automatic friend approval
2686
2687                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2688
2689                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2690
2691                         // technically they are sharing with us (CONTACT_IS_SHARING),
2692                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2693                         // we are going to change the relationship and make them a follower.
2694
2695                         if (($importer["page-flags"] == PAGE_FREELOVE) && $sharing && $following) {
2696                                 $new_relation = CONTACT_IS_FRIEND;
2697                         } elseif (($importer["page-flags"] == PAGE_FREELOVE) && $sharing) {
2698                                 $new_relation = CONTACT_IS_SHARING;
2699                         } else {
2700                                 $new_relation = CONTACT_IS_FOLLOWER;
2701                         }
2702
2703                         $r = q(
2704                                 "UPDATE `contact` SET `rel` = %d,
2705                                 `name-date` = '%s',
2706                                 `uri-date` = '%s',
2707                                 `blocked` = 0,
2708                                 `pending` = 0,
2709                                 `writable` = 1
2710                                 WHERE `id` = %d
2711                                 ",
2712                                 intval($new_relation),
2713                                 dbesc(DateTimeFormat::utcNow()),
2714                                 dbesc(DateTimeFormat::utcNow()),
2715                                 intval($contact_record["id"])
2716                         );
2717
2718                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2719                         if ($u) {
2720                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2721                                 $ret = self::sendShare($u[0], $contact_record);
2722
2723                                 // Send the profile data, maybe it weren't transmitted before
2724                                 self::sendProfile($importer["uid"], [$contact_record]);
2725                         }
2726                 }
2727
2728                 return true;
2729         }
2730
2731         /**
2732          * @brief Fetches a message with a given guid
2733          *
2734          * @param string $guid        message guid
2735          * @param string $orig_author handle of the original post
2736          * @param string $author      handle of the sharer
2737          *
2738          * @return array The fetched item
2739          */
2740         public static function originalItem($guid, $orig_author)
2741         {
2742                 // Do we already have this item?
2743                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2744                         'author-name', 'author-link', 'author-avatar'];
2745                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false];
2746                 $item = dba::selectfirst('item', $fields, $condition);
2747
2748                 if (DBM::is_result($item)) {
2749                         logger("reshared message ".$guid." already exists on system.");
2750
2751                         // Maybe it is already a reshared item?
2752                         // Then refetch the content, if it is a reshare from a reshare.
2753                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2754                         if (self::isReshare($item["body"], true)) {
2755                                 $r = [];
2756                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2757                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2758
2759                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2760
2761                                 // Add OEmbed and other information to the body
2762                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2763
2764                                 return $item;
2765                         } else {
2766                                 return $item;
2767                         }
2768                 }
2769
2770                 if (!DBM::is_result($r)) {
2771                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2772                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2773                         $item_id = self::storeByGuid($guid, $server);
2774
2775                         if (!$item_id) {
2776                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2777                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
2778                                 $item_id = self::storeByGuid($guid, $server);
2779                         }
2780
2781                         if ($item_id) {
2782                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2783                                         'author-name', 'author-link', 'author-avatar'];
2784                                 $condition = ['id' => $item_id, 'visible' => true, 'deleted' => false];
2785                                 $item = dba::selectfirst('item', $fields, $condition);
2786
2787                                 if (DBM::is_result($item)) {
2788                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2789                                         if (self::isReshare($item["body"], false)) {
2790                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2791                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2792                                         }
2793
2794                                         return $item;
2795                                 }
2796                         }
2797                 }
2798                 return false;
2799         }
2800
2801         /**
2802          * @brief Processes a reshare message
2803          *
2804          * @param array  $importer Array of the importer user
2805          * @param object $data     The message object
2806          * @param string $xml      The original XML of the message
2807          *
2808          * @return int the message id
2809          */
2810         private static function receiveReshare($importer, $data, $xml)
2811         {
2812                 $author = notags(unxmlify($data->author));
2813                 $guid = notags(unxmlify($data->guid));
2814                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
2815                 $root_author = notags(unxmlify($data->root_author));
2816                 $root_guid = notags(unxmlify($data->root_guid));
2817                 /// @todo handle unprocessed property "provider_display_name"
2818                 $public = notags(unxmlify($data->public));
2819
2820                 $contact = self::allowedContactByHandle($importer, $author, false);
2821                 if (!$contact) {
2822                         return false;
2823                 }
2824
2825                 $message_id = self::messageExists($importer["uid"], $guid);
2826                 if ($message_id) {
2827                         return true;
2828                 }
2829
2830                 $original_item = self::originalItem($root_guid, $root_author);
2831                 if (!$original_item) {
2832                         return false;
2833                 }
2834
2835                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2836
2837                 $datarray = [];
2838
2839                 $datarray["uid"] = $importer["uid"];
2840                 $datarray["contact-id"] = $contact["id"];
2841                 $datarray["network"]  = NETWORK_DIASPORA;
2842
2843                 $datarray["author-name"] = $contact["name"];
2844                 $datarray["author-link"] = $contact["url"];
2845                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2846
2847                 $datarray["owner-name"] = $datarray["author-name"];
2848                 $datarray["owner-link"] = $datarray["author-link"];
2849                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2850
2851                 $datarray["guid"] = $guid;
2852                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2853
2854                 $datarray["verb"] = ACTIVITY_POST;
2855                 $datarray["gravity"] = GRAVITY_PARENT;
2856
2857                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2858                 $datarray["source"] = $xml;
2859
2860                 $prefix = share_header(
2861                         $original_item["author-name"],
2862                         $original_item["author-link"],
2863                         $original_item["author-avatar"],
2864                         $original_item["guid"],
2865                         $original_item["created"],
2866                         $orig_url
2867                 );
2868                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2869
2870                 $datarray["tag"] = $original_item["tag"];
2871                 $datarray["app"]  = $original_item["app"];
2872
2873                 $datarray["plink"] = self::plink($author, $guid);
2874                 $datarray["private"] = (($public == "false") ? 1 : 0);
2875                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2876
2877                 $datarray["object-type"] = $original_item["object-type"];
2878
2879                 self::fetchGuid($datarray);
2880                 $message_id = Item::insert($datarray);
2881
2882                 self::sendParticipation($contact, $datarray);
2883
2884                 if ($message_id) {
2885                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2886                         return true;
2887                 } else {
2888                         return false;
2889                 }
2890         }
2891
2892         /**
2893          * @brief Processes retractions
2894          *
2895          * @param array  $importer Array of the importer user
2896          * @param array  $contact  The contact of the item owner
2897          * @param object $data     The message object
2898          *
2899          * @return bool success
2900          */
2901         private static function itemRetraction($importer, $contact, $data)
2902         {
2903                 $author = notags(unxmlify($data->author));
2904                 $target_guid = notags(unxmlify($data->target_guid));
2905                 $target_type = notags(unxmlify($data->target_type));
2906
2907                 $person = self::personByHandle($author);
2908                 if (!is_array($person)) {
2909                         logger("unable to find author detail for ".$author);
2910                         return false;
2911                 }
2912
2913                 if (empty($contact["url"])) {
2914                         $contact["url"] = $person["url"];
2915                 }
2916
2917                 // Fetch items that are about to be deleted
2918                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link'];
2919
2920                 // When we receive a public retraction, we delete every item that we find.
2921                 if ($importer['uid'] == 0) {
2922                         $condition = ["`guid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid];
2923                 } else {
2924                         $condition = ["`guid` = ? AND `uid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid, $importer['uid']];
2925                 }
2926                 $r = dba::select('item', $fields, $condition);
2927                 if (!DBM::is_result($r)) {
2928                         logger("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2929                         return false;
2930                 }
2931
2932                 while ($item = dba::fetch($r)) {
2933                         // Fetch the parent item
2934                         $parent = dba::selectFirst('item', ['author-link', 'origin'], ['id' => $item["parent"]]);
2935
2936                         // Only delete it if the parent author really fits
2937                         if (!link_compare($parent["author-link"], $contact["url"]) && !link_compare($item["author-link"], $contact["url"])) {
2938                                 logger("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2939                                 continue;
2940                         }
2941
2942                         Item::deleteById($item["id"]);
2943
2944                         logger("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], LOGGER_DEBUG);
2945
2946                         // Now check if the retraction needs to be relayed by us
2947                         if ($parent["origin"]) {
2948                                 // notify others
2949                                 Worker::add(PRIORITY_HIGH, "Notifier", "drop", $item["id"]);
2950                         }
2951                 }
2952
2953                 return true;
2954         }
2955
2956         /**
2957          * @brief Receives retraction messages
2958          *
2959          * @param array  $importer Array of the importer user
2960          * @param string $sender   The sender of the message
2961          * @param object $data     The message object
2962          *
2963          * @return bool Success
2964          */
2965         private static function receiveRetraction($importer, $sender, $data)
2966         {
2967                 $target_type = notags(unxmlify($data->target_type));
2968
2969                 $contact = self::contactByHandle($importer["uid"], $sender);
2970                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2971                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2972                         return false;
2973                 }
2974
2975                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2976
2977                 switch ($target_type) {
2978                         case "Comment":
2979                         case "Like":
2980                         case "Post":
2981                         case "Reshare":
2982                         case "StatusMessage":
2983                                 return self::itemRetraction($importer, $contact, $data);
2984
2985                         case "Contact":
2986                         case "Person":
2987                                 /// @todo What should we do with an "unshare"?
2988                                 // Removing the contact isn't correct since we still can read the public items
2989                                 Contact::remove($contact["id"]);
2990                                 return true;
2991
2992                         default:
2993                                 logger("Unknown target type ".$target_type);
2994                                 return false;
2995                 }
2996                 return true;
2997         }
2998
2999         /**
3000          * @brief Receives status messages
3001          *
3002          * @param array  $importer Array of the importer user
3003          * @param object $data     The message object
3004          * @param string $xml      The original XML of the message
3005          *
3006          * @return int The message id of the newly created item
3007          */
3008         private static function receiveStatusMessage($importer, $data, $xml)
3009         {
3010                 $author = notags(unxmlify($data->author));
3011                 $guid = notags(unxmlify($data->guid));
3012                 $created_at = DateTimeFormat::utc(notags(unxmlify($data->created_at)));
3013                 $public = notags(unxmlify($data->public));
3014                 $text = unxmlify($data->text);
3015                 $provider_display_name = notags(unxmlify($data->provider_display_name));
3016
3017                 $contact = self::allowedContactByHandle($importer, $author, false);
3018                 if (!$contact) {
3019                         return false;
3020                 }
3021
3022                 $message_id = self::messageExists($importer["uid"], $guid);
3023                 if ($message_id) {
3024                         return true;
3025                 }
3026
3027                 $address = [];
3028                 if ($data->location) {
3029                         foreach ($data->location->children() as $fieldname => $data) {
3030                                 $address[$fieldname] = notags(unxmlify($data));
3031                         }
3032                 }
3033
3034                 $body = Markdown::toBBCode($text);
3035
3036                 $datarray = [];
3037
3038                 // Attach embedded pictures to the body
3039                 if ($data->photo) {
3040                         foreach ($data->photo as $photo) {
3041                                 $body = "[img]".unxmlify($photo->remote_photo_path).
3042                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
3043                         }
3044
3045                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
3046                 } else {
3047                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
3048
3049                         // Add OEmbed and other information to the body
3050                         if (!self::isRedmatrix($contact["url"])) {
3051                                 $body = add_page_info_to_body($body, false, true);
3052                         }
3053                 }
3054
3055                 /// @todo enable support for polls
3056                 //if ($data->poll) {
3057                 //      foreach ($data->poll AS $poll)
3058                 //              print_r($poll);
3059                 //      die("poll!\n");
3060                 //}
3061
3062                 /// @todo enable support for events
3063
3064                 $datarray["uid"] = $importer["uid"];
3065                 $datarray["contact-id"] = $contact["id"];
3066                 $datarray["network"] = NETWORK_DIASPORA;
3067
3068                 $datarray["author-name"] = $contact["name"];
3069                 $datarray["author-link"] = $contact["url"];
3070                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
3071
3072                 $datarray["owner-name"] = $datarray["author-name"];
3073                 $datarray["owner-link"] = $datarray["author-link"];
3074                 $datarray["owner-avatar"] = $datarray["author-avatar"];
3075
3076                 $datarray["guid"] = $guid;
3077                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
3078
3079                 $datarray["verb"] = ACTIVITY_POST;
3080                 $datarray["gravity"] = GRAVITY_PARENT;
3081
3082                 $datarray["protocol"] = PROTOCOL_DIASPORA;
3083                 $datarray["source"] = $xml;
3084
3085                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
3086
3087                 if ($provider_display_name != "") {
3088                         $datarray["app"] = $provider_display_name;
3089                 }
3090
3091                 $datarray["plink"] = self::plink($author, $guid);
3092                 $datarray["private"] = (($public == "false") ? 1 : 0);
3093                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
3094
3095                 if (isset($address["address"])) {
3096                         $datarray["location"] = $address["address"];
3097                 }
3098
3099                 if (isset($address["lat"]) && isset($address["lng"])) {
3100                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
3101                 }
3102
3103                 self::fetchGuid($datarray);
3104                 $message_id = Item::insert($datarray);
3105
3106                 self::sendParticipation($contact, $datarray);
3107
3108                 if ($message_id) {
3109                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
3110                         return true;
3111                 } else {
3112                         return false;
3113                 }
3114         }
3115
3116         /* ************************************************************************************** *
3117          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
3118          * ************************************************************************************** */
3119
3120         /**
3121          * @brief returnes the handle of a contact
3122          *
3123          * @param array $contact contact array
3124          *
3125          * @return string the handle in the format user@domain.tld
3126          */
3127         private static function myHandle($contact)
3128         {
3129                 if ($contact["addr"] != "") {
3130                         return $contact["addr"];
3131                 }
3132
3133                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
3134                 // So - just in case - we build the the address here.
3135                 if ($contact["nickname"] != "") {
3136                         $nick = $contact["nickname"];
3137                 } else {
3138                         $nick = $contact["nick"];
3139                 }
3140
3141                 return $nick."@".substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
3142         }
3143
3144
3145         /**
3146          * @brief Creates the data for a private message in the new format
3147          *
3148          * @param string $msg     The message that is to be transmitted
3149          * @param array  $user    The record of the sender
3150          * @param array  $contact Target of the communication
3151          * @param string $prvkey  The private key of the sender
3152          * @param string $pubkey  The public key of the receiver
3153          *
3154          * @return string The encrypted data
3155          */
3156         public static function encodePrivateData($msg, $user, $contact, $prvkey, $pubkey)
3157         {
3158                 logger("Message: ".$msg, LOGGER_DATA);
3159
3160                 // without a public key nothing will work
3161                 if (!$pubkey) {
3162                         logger("pubkey missing: contact id: ".$contact["id"]);
3163                         return false;
3164                 }
3165
3166                 $aes_key = openssl_random_pseudo_bytes(32);
3167                 $b_aes_key = base64_encode($aes_key);
3168                 $iv = openssl_random_pseudo_bytes(16);
3169                 $b_iv = base64_encode($iv);
3170
3171                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3172
3173                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3174
3175                 $encrypted_key_bundle = "";
3176                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3177
3178                 $json_object = json_encode(
3179                         ["aes_key" => base64_encode($encrypted_key_bundle),
3180                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3181                 );
3182
3183                 return $json_object;
3184         }
3185
3186         /**
3187          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3188          *
3189          * @param string $msg  The message that is to be transmitted
3190          * @param array  $user The record of the sender
3191          *
3192          * @return string The envelope
3193          */
3194         public static function buildMagicEnvelope($msg, $user)
3195         {
3196                 $b64url_data = base64url_encode($msg);
3197                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3198
3199                 $key_id = base64url_encode(self::myHandle($user));
3200                 $type = "application/xml";
3201                 $encoding = "base64url";
3202                 $alg = "RSA-SHA256";
3203                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
3204
3205                 // Fallback if the private key wasn't transmitted in the expected field
3206                 if ($user['uprvkey'] == "") {
3207                         $user['uprvkey'] = $user['prvkey'];
3208                 }
3209
3210                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3211                 $sig = base64url_encode($signature);
3212
3213                 $xmldata = ["me:env" => ["me:data" => $data,
3214                                                         "@attributes" => ["type" => $type],
3215                                                         "me:encoding" => $encoding,
3216                                                         "me:alg" => $alg,
3217                                                         "me:sig" => $sig,
3218                                                         "@attributes2" => ["key_id" => $key_id]]];
3219
3220                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3221
3222                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3223         }
3224
3225         /**
3226          * @brief Create the envelope for a message
3227          *
3228          * @param string $msg     The message that is to be transmitted
3229          * @param array  $user    The record of the sender
3230          * @param array  $contact Target of the communication
3231          * @param string $prvkey  The private key of the sender
3232          * @param string $pubkey  The public key of the receiver
3233          * @param bool   $public  Is the message public?
3234          *
3235          * @return string The message that will be transmitted to other servers
3236          */
3237         public static function buildMessage($msg, $user, $contact, $prvkey, $pubkey, $public = false)
3238         {
3239                 // The message is put into an envelope with the sender's signature
3240                 $envelope = self::buildMagicEnvelope($msg, $user);
3241
3242                 // Private messages are put into a second envelope, encrypted with the receivers public key
3243                 if (!$public) {
3244                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3245                 }
3246
3247                 return $envelope;
3248         }
3249
3250         /**
3251          * @brief Creates a signature for a message
3252          *
3253          * @param array $owner   the array of the owner of the message
3254          * @param array $message The message that is to be signed
3255          *
3256          * @return string The signature
3257          */
3258         private static function signature($owner, $message)
3259         {
3260                 $sigmsg = $message;
3261                 unset($sigmsg["author_signature"]);
3262                 unset($sigmsg["parent_author_signature"]);
3263
3264                 $signed_text = implode(";", $sigmsg);
3265
3266                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3267         }
3268
3269         /**
3270          * @brief Transmit a message to a target server
3271          *
3272          * @param array  $owner        the array of the item owner
3273          * @param array  $contact      Target of the communication
3274          * @param string $envelope     The message that is to be transmitted
3275          * @param bool   $public_batch Is it a public post?
3276          * @param bool   $queue_run    Is the transmission called from the queue?
3277          * @param string $guid         message guid
3278          *
3279          * @return int Result of the transmission
3280          */
3281         public static function transmit($owner, $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
3282         {
3283                 $a = get_app();
3284
3285                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3286                 if (!$enabled) {
3287                         return 200;
3288                 }
3289
3290                 $logid = random_string(4);
3291
3292                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3293
3294                 // We always try to use the data from the fcontact table.
3295                 // This is important for transmitting data to Friendica servers.
3296                 if (!empty($contact['addr'])) {
3297                         $fcontact = self::personByHandle($contact['addr']);
3298                         if (!empty($fcontact)) {
3299                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3300                         }
3301                 }
3302
3303                 if (!$dest_url) {
3304                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3305                         return 0;
3306                 }
3307
3308                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
3309
3310                 if (!$queue_run && Queue::wasDelayed($contact["id"])) {
3311                         $return_code = 0;
3312                 } else {
3313                         if (!intval(Config::get("system", "diaspora_test"))) {
3314                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3315
3316                                 Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3317                                 $return_code = $a->get_curl_code();
3318                         } else {
3319                                 logger("test_mode");
3320                                 return 200;
3321                         }
3322                 }
3323
3324                 logger("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3325
3326                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
3327                         if (!$no_queue && ($contact['contact-type'] != ACCOUNT_TYPE_RELAY)) {
3328                                 logger("queue message");
3329                                 // queue message for redelivery
3330                                 Queue::add($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3331                         }
3332
3333                         // The message could not be delivered. We mark the contact as "dead"
3334                         Contact::markForArchival($contact);
3335                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3336                         // We successfully delivered a message, the contact is alive
3337                         Contact::unmarkForArchival($contact);
3338                 }
3339
3340                 return $return_code ? $return_code : -1;
3341         }
3342
3343
3344         /**
3345          * @brief Build the post xml
3346          *
3347          * @param string $type    The message type
3348          * @param array  $message The message data
3349          *
3350          * @return string The post XML
3351          */
3352         public static function buildPostXml($type, $message)
3353         {
3354                 $data = [$type => $message];
3355
3356                 return XML::fromArray($data, $xml);
3357         }
3358
3359         /**
3360          * @brief Builds and transmit messages
3361          *
3362          * @param array  $owner        the array of the item owner
3363          * @param array  $contact      Target of the communication
3364          * @param string $type         The message type
3365          * @param array  $message      The message data
3366          * @param bool   $public_batch Is it a public post?
3367          * @param string $guid         message guid
3368          * @param bool   $spool        Should the transmission be spooled or transmitted?
3369          *
3370          * @return int Result of the transmission
3371          */
3372         private static function buildAndTransmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3373         {
3374                 $msg = self::buildPostXml($type, $message);
3375
3376                 logger('message: '.$msg, LOGGER_DATA);
3377                 logger('send guid '.$guid, LOGGER_DEBUG);
3378
3379                 // Fallback if the private key wasn't transmitted in the expected field
3380                 if ($owner['uprvkey'] == "") {
3381                         $owner['uprvkey'] = $owner['prvkey'];
3382                 }
3383
3384                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3385
3386                 if ($spool) {
3387                         Queue::add($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch, $guid);
3388                         return true;
3389                 } else {
3390                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3391                 }
3392
3393                 logger("guid: ".$guid." result ".$return_code, LOGGER_DEBUG);
3394
3395                 return $return_code;
3396         }
3397
3398         /**
3399          * @brief sends a participation (Used to get all further updates)
3400          *
3401          * @param array $contact Target of the communication
3402          * @param array $item    Item array
3403          *
3404          * @return int The result of the transmission
3405          */
3406         private static function sendParticipation($contact, $item)
3407         {
3408                 // Don't send notifications for private postings
3409                 if ($item['private']) {
3410                         return;
3411                 }
3412
3413                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3414
3415                 $result = Cache::get($cachekey);
3416                 if (!is_null($result)) {
3417                         return;
3418                 }
3419
3420                 // Fetch some user id to have a valid handle to transmit the participation.
3421                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3422                 // If the item belongs to a user, we take this user id.
3423                 if ($item['uid'] == 0) {
3424                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3425                         $first_user = dba::selectFirst('user', ['uid'], $condition);
3426                         $owner = User::getOwnerDataById($first_user['uid']);
3427                 } else {
3428                         $owner = User::getOwnerDataById($item['uid']);
3429                 }
3430
3431                 $author = self::myHandle($owner);
3432
3433                 $message = ["author" => $author,
3434                                 "guid" => get_guid(32),
3435                                 "parent_type" => "Post",
3436                                 "parent_guid" => $item["guid"]];
3437
3438                 logger("Send participation for ".$item["guid"]." by ".$author, LOGGER_DEBUG);
3439
3440                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3441                 Cache::set($cachekey, $item["guid"], CACHE_QUARTER_HOUR);
3442
3443                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3444         }
3445
3446         /**
3447          * @brief sends an account migration
3448          *
3449          * @param array $owner   the array of the item owner
3450          * @param array $contact Target of the communication
3451          * @param int   $uid     User ID
3452          *
3453          * @return int The result of the transmission
3454          */
3455         public static function sendAccountMigration($owner, $contact, $uid)
3456         {
3457                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3458                 $profile = self::createProfileData($uid);
3459
3460                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3461                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3462
3463                 $message = ["author" => $old_handle,
3464                                 "profile" => $profile,
3465                                 "signature" => $signature];
3466
3467                 logger("Send account migration ".print_r($message, true), LOGGER_DEBUG);
3468
3469                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3470         }
3471
3472         /**
3473          * @brief Sends a "share" message
3474          *
3475          * @param array $owner   the array of the item owner
3476          * @param array $contact Target of the communication
3477          *
3478          * @return int The result of the transmission
3479          */
3480         public static function sendShare($owner, $contact)
3481         {
3482                 /**
3483                  * @todo support the different possible combinations of "following" and "sharing"
3484                  * Currently, Diaspora only interprets the "sharing" field
3485                  *
3486                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3487                  */
3488
3489                 /*
3490                 switch ($contact["rel"]) {
3491                         case CONTACT_IS_FRIEND:
3492                                 $following = true;
3493                                 $sharing = true;
3494                         case CONTACT_IS_SHARING:
3495                                 $following = false;
3496                                 $sharing = true;
3497                         case CONTACT_IS_FOLLOWER:
3498                                 $following = true;
3499                                 $sharing = false;
3500                 }
3501                 */
3502
3503                 $message = ["author" => self::myHandle($owner),
3504                                 "recipient" => $contact["addr"],
3505                                 "following" => "true",
3506                                 "sharing" => "true"];
3507
3508                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
3509
3510                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3511         }
3512
3513         /**
3514          * @brief sends an "unshare"
3515          *
3516          * @param array $owner   the array of the item owner
3517          * @param array $contact Target of the communication
3518          *
3519          * @return int The result of the transmission
3520          */
3521         public static function sendUnshare($owner, $contact)
3522         {
3523                 $message = ["author" => self::myHandle($owner),
3524                                 "recipient" => $contact["addr"],
3525                                 "following" => "false",
3526                                 "sharing" => "false"];
3527
3528                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
3529
3530                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3531         }
3532
3533         /**
3534          * @brief Checks a message body if it is a reshare
3535          *
3536          * @param string $body     The message body that is to be check
3537          * @param bool   $complete Should it be a complete check or a simple check?
3538          *
3539          * @return array|bool Reshare details or "false" if no reshare
3540          */
3541         public static function isReshare($body, $complete = true)
3542         {
3543                 $body = trim($body);
3544
3545                 // Skip if it isn't a pure repeated messages
3546                 // Does it start with a share?
3547                 if ((strpos($body, "[share") > 0) && $complete) {
3548                         return false;
3549                 }
3550
3551                 // Does it end with a share?
3552                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3553                         return false;
3554                 }
3555
3556                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3557                 // Skip if there is no shared message in there
3558                 if ($body == $attributes) {
3559                         return false;
3560                 }
3561
3562                 // If we don't do the complete check we quit here
3563
3564                 $guid = "";
3565                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3566                 if ($matches[1] != "") {
3567                         $guid = $matches[1];
3568                 }
3569
3570                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3571                 if ($matches[1] != "") {
3572                         $guid = $matches[1];
3573                 }
3574
3575                 if (($guid != "") && $complete) {
3576                         $condition = ['guid' => $guid, 'network' => [NETWORK_DFRN, NETWORK_DIASPORA]];
3577                         $item = dba::selectFirst('item', ['contact-id'], $condition);
3578                         if (DBM::is_result($item)) {
3579                                 $ret= [];
3580                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3581                                 $ret["root_guid"] = $guid;
3582                                 return $ret;
3583                         }
3584                 }
3585
3586                 $profile = "";
3587                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3588                 if ($matches[1] != "") {
3589                         $profile = $matches[1];
3590                 }
3591
3592                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3593                 if ($matches[1] != "") {
3594                         $profile = $matches[1];
3595                 }
3596
3597                 $ret= [];
3598
3599                 if ($profile != "") {
3600                         if (Contact::getIdForURL($profile)) {
3601                                 $author = Contact::getDetailsByURL($profile);
3602                                 $ret["root_handle"] = $author['addr'];
3603                         }
3604                 }
3605
3606                 if (!empty($guid)) {
3607                         $ret["root_guid"] = $guid;
3608                 }
3609
3610                 if (empty($ret) && !$complete) {
3611                         return true;
3612                 }
3613
3614                 return $ret;
3615         }
3616
3617         /**
3618          * @brief Create an event array
3619          *
3620          * @param integer $event_id The id of the event
3621          *
3622          * @return array with event data
3623          */
3624         private static function buildEvent($event_id)
3625         {
3626                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3627                 if (!DBM::is_result($r)) {
3628                         return [];
3629                 }
3630
3631                 $event = $r[0];
3632
3633                 $eventdata = [];
3634
3635                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3636                 if (!DBM::is_result($r)) {
3637                         return [];
3638                 }
3639
3640                 $user = $r[0];
3641
3642                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3643                 if (!DBM::is_result($r)) {
3644                         return [];
3645                 }
3646
3647                 $owner = $r[0];
3648
3649                 $eventdata['author'] = self::myHandle($owner);
3650
3651                 if ($event['guid']) {
3652                         $eventdata['guid'] = $event['guid'];
3653                 }
3654
3655                 $mask = DateTimeFormat::ATOM;
3656
3657                 /// @todo - establish "all day" events in Friendica
3658                 $eventdata["all_day"] = "false";
3659
3660                 if (!$event['adjust']) {
3661                         $eventdata['timezone'] = $user['timezone'];
3662
3663                         if ($eventdata['timezone'] == "") {
3664                                 $eventdata['timezone'] = 'UTC';
3665                         }
3666                 }
3667
3668                 if ($event['start']) {
3669                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3670                 }
3671                 if ($event['finish'] && !$event['nofinish']) {
3672                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3673                 }
3674                 if ($event['summary']) {
3675                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3676                 }
3677                 if ($event['desc']) {
3678                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3679                 }
3680                 if ($event['location']) {
3681                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3682                         $coord = Map::getCoordinates($event['location']);
3683
3684                         $location = [];
3685                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3686                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3687                                 $location["lat"] = $coord['lat'];
3688                                 $location["lng"] = $coord['lon'];
3689                         } else {
3690                                 $location["lat"] = 0;
3691                                 $location["lng"] = 0;
3692                         }
3693                         $eventdata['location'] = $location;
3694                 }
3695
3696                 return $eventdata;
3697         }
3698
3699         /**
3700          * @brief Create a post (status message or reshare)
3701          *
3702          * @param array $item  The item that will be exported
3703          * @param array $owner the array of the item owner
3704          *
3705          * @return array
3706          * 'type' -> Message type ("status_message" or "reshare")
3707          * 'message' -> Array of XML elements of the status
3708          */
3709         public static function buildStatus($item, $owner)
3710         {
3711                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3712
3713                 $result = Cache::get($cachekey);
3714                 if (!is_null($result)) {
3715                         return $result;
3716                 }
3717
3718                 $myaddr = self::myHandle($owner);
3719
3720                 $public = (($item["private"]) ? "false" : "true");
3721
3722                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3723
3724                 // Detect a share element and do a reshare
3725                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3726                         $message = ["author" => $myaddr,
3727                                         "guid" => $item["guid"],
3728                                         "created_at" => $created,
3729                                         "root_author" => $ret["root_handle"],
3730                                         "root_guid" => $ret["root_guid"],
3731                                         "provider_display_name" => $item["app"],
3732                                         "public" => $public];
3733
3734                         $type = "reshare";
3735                 } else {
3736                         $title = $item["title"];
3737                         $body = $item["body"];
3738
3739                         if ($item['author-link'] != $item['owner-link']) {
3740                                 require_once 'mod/share.php';
3741                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3742                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3743                         }
3744
3745                         // convert to markdown
3746                         $body = html_entity_decode(BBCode::toMarkdown($body));
3747
3748                         // Adding the title
3749                         if (strlen($title)) {
3750                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3751                         }
3752
3753                         if ($item["attach"]) {
3754                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3755                                 if (cnt) {
3756                                         $body .= "\n".L10n::t("Attachments:")."\n";
3757                                         foreach ($matches as $mtch) {
3758                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3759                                         }
3760                                 }
3761                         }
3762
3763                         $location = [];
3764
3765                         if ($item["location"] != "")
3766                                 $location["address"] = $item["location"];
3767
3768                         if ($item["coord"] != "") {
3769                                 $coord = explode(" ", $item["coord"]);
3770                                 $location["lat"] = $coord[0];
3771                                 $location["lng"] = $coord[1];
3772                         }
3773
3774                         $message = ["author" => $myaddr,
3775                                         "guid" => $item["guid"],
3776                                         "created_at" => $created,
3777                                         "public" => $public,
3778                                         "text" => $body,
3779                                         "provider_display_name" => $item["app"],
3780                                         "location" => $location];
3781
3782                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3783                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3784                                 unset($message["location"]);
3785                         }
3786
3787                         if ($item['event-id'] > 0) {
3788                                 $event = self::buildEvent($item['event-id']);
3789                                 if (count($event)) {
3790                                         $message['event'] = $event;
3791
3792                                         if (!empty($event['location']['address']) &&
3793                                                 !empty($event['location']['lat']) &&
3794                                                 !empty($event['location']['lng'])) {
3795                                                 $message['location'] = $event['location'];
3796                                         }
3797
3798                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3799                                         // $message['text'] = '';
3800                                 }
3801                         }
3802
3803                         $type = "status_message";
3804                 }
3805
3806                 $msg = ["type" => $type, "message" => $message];
3807
3808                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3809
3810                 return $msg;
3811         }
3812
3813         /**
3814          * @brief Sends a post
3815          *
3816          * @param array $item         The item that will be exported
3817          * @param array $owner        the array of the item owner
3818          * @param array $contact      Target of the communication
3819          * @param bool  $public_batch Is it a public post?
3820          *
3821          * @return int The result of the transmission
3822          */
3823         public static function sendStatus($item, $owner, $contact, $public_batch = false)
3824         {
3825                 $status = self::buildStatus($item, $owner);
3826
3827                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3828         }
3829
3830         /**
3831          * @brief Creates a "like" object
3832          *
3833          * @param array $item  The item that will be exported
3834          * @param array $owner the array of the item owner
3835          *
3836          * @return array The data for a "like"
3837          */
3838         private static function constructLike($item, $owner)
3839         {
3840                 $p = q(
3841                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3842                         dbesc($item["thr-parent"])
3843                 );
3844                 if (!DBM::is_result($p)) {
3845                         return false;
3846                 }
3847
3848                 $parent = $p[0];
3849
3850                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3851                 $positive = null;
3852                 if ($item['verb'] === ACTIVITY_LIKE) {
3853                         $positive = "true";
3854                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3855                         $positive = "false";
3856                 }
3857
3858                 return(["author" => self::myHandle($owner),
3859                                 "guid" => $item["guid"],
3860                                 "parent_guid" => $parent["guid"],
3861                                 "parent_type" => $target_type,
3862                                 "positive" => $positive,
3863                                 "author_signature" => ""]);
3864         }
3865
3866         /**
3867          * @brief Creates an "EventParticipation" object
3868          *
3869          * @param array $item  The item that will be exported
3870          * @param array $owner the array of the item owner
3871          *
3872          * @return array The data for an "EventParticipation"
3873          */
3874         private static function constructAttend($item, $owner)
3875         {
3876                 $p = q(
3877                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3878                         dbesc($item["thr-parent"])
3879                 );
3880                 if (!DBM::is_result($p)) {
3881                         return false;
3882                 }
3883
3884                 $parent = $p[0];
3885
3886                 switch ($item['verb']) {
3887                         case ACTIVITY_ATTEND:
3888                                 $attend_answer = 'accepted';
3889                                 break;
3890                         case ACTIVITY_ATTENDNO:
3891                                 $attend_answer = 'declined';
3892                                 break;
3893                         case ACTIVITY_ATTENDMAYBE:
3894                                 $attend_answer = 'tentative';
3895                                 break;
3896                         default:
3897                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3898                                 return false;
3899                 }
3900
3901                 return(["author" => self::myHandle($owner),
3902                                 "guid" => $item["guid"],
3903                                 "parent_guid" => $parent["guid"],
3904                                 "status" => $attend_answer,
3905                                 "author_signature" => ""]);
3906         }
3907
3908         /**
3909          * @brief Creates the object for a comment
3910          *
3911          * @param array $item  The item that will be exported
3912          * @param array $owner the array of the item owner
3913          *
3914          * @return array The data for a comment
3915          */
3916         private static function constructComment($item, $owner)
3917         {
3918                 $cachekey = "diaspora:constructComment:".$item['guid'];
3919
3920                 $result = Cache::get($cachekey);
3921                 if (!is_null($result)) {
3922                         return $result;
3923                 }
3924
3925                 $p = q(
3926                         "SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3927                         intval($item["parent"]),
3928                         intval($item["parent"])
3929                 );
3930
3931                 if (!DBM::is_result($p)) {
3932                         return false;
3933                 }
3934
3935                 $parent = $p[0];
3936
3937                 $text = html_entity_decode(BBCode::toMarkdown($item["body"]));
3938                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3939
3940                 $comment = ["author" => self::myHandle($owner),
3941                                 "guid" => $item["guid"],
3942                                 "created_at" => $created,
3943                                 "parent_guid" => $parent["guid"],
3944                                 "text" => $text,
3945                                 "author_signature" => ""];
3946
3947                 // Send the thread parent guid only if it is a threaded comment
3948                 if ($item['thr-parent'] != $item['parent-uri']) {
3949                         $comment['thread_parent_guid'] = self::getGuidFromUri($item['thr-parent'], $item['uid']);
3950                 }
3951
3952                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3953
3954                 return($comment);
3955         }
3956
3957         /**
3958          * @brief Send a like or a comment
3959          *
3960          * @param array $item         The item that will be exported
3961          * @param array $owner        the array of the item owner
3962          * @param array $contact      Target of the communication
3963          * @param bool  $public_batch Is it a public post?
3964          *
3965          * @return int The result of the transmission
3966          */
3967         public static function sendFollowup($item, $owner, $contact, $public_batch = false)
3968         {
3969                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3970                         $message = self::constructAttend($item, $owner);
3971                         $type = "event_participation";
3972                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3973                         $message = self::constructLike($item, $owner);
3974                         $type = "like";
3975                 } else {
3976                         $message = self::constructComment($item, $owner);
3977                         $type = "comment";
3978                 }
3979
3980                 if (!$message) {
3981                         return false;
3982                 }
3983
3984                 $message["author_signature"] = self::signature($owner, $message);
3985
3986                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3987         }
3988
3989         /**
3990          * @brief Creates a message from a signature record entry
3991          *
3992          * @param array $item      The item that will be exported
3993          * @param array $signature The entry of the "sign" record
3994          *
3995          * @return string The message
3996          */
3997         private static function messageFromSignature($item, $signature)
3998         {
3999                 // Split the signed text
4000                 $signed_parts = explode(";", $signature['signed_text']);
4001
4002                 if ($item["deleted"]) {
4003                         $message = ["author" => $signature['signer'],
4004                                         "target_guid" => $signed_parts[0],
4005                                         "target_type" => $signed_parts[1]];
4006                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4007                         $message = ["author" => $signed_parts[4],
4008                                         "guid" => $signed_parts[1],
4009                                         "parent_guid" => $signed_parts[3],
4010                                         "parent_type" => $signed_parts[2],
4011                                         "positive" => $signed_parts[0],
4012                                         "author_signature" => $signature['signature'],
4013                                         "parent_author_signature" => ""];
4014                 } else {
4015                         // Remove the comment guid
4016                         $guid = array_shift($signed_parts);
4017
4018                         // Remove the parent guid
4019                         $parent_guid = array_shift($signed_parts);
4020
4021                         // Remove the handle
4022                         $handle = array_pop($signed_parts);
4023
4024                         // Glue the parts together
4025                         $text = implode(";", $signed_parts);
4026
4027                         $message = ["author" => $handle,
4028                                         "guid" => $guid,
4029                                         "parent_guid" => $parent_guid,
4030                                         "text" => implode(";", $signed_parts),
4031                                         "author_signature" => $signature['signature'],
4032                                         "parent_author_signature" => ""];
4033                 }
4034                 return $message;
4035         }
4036
4037         /**
4038          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
4039          *
4040          * @param array $item         The item that will be exported
4041          * @param array $owner        the array of the item owner
4042          * @param array $contact      Target of the communication
4043          * @param bool  $public_batch Is it a public post?
4044          *
4045          * @return int The result of the transmission
4046          */
4047         public static function sendRelay($item, $owner, $contact, $public_batch = false)
4048         {
4049                 if ($item["deleted"]) {
4050                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
4051                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4052                         $type = "like";
4053                 } else {
4054                         $type = "comment";
4055                 }
4056
4057                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
4058
4059                 // fetch the original signature
4060
4061                 $r = q(
4062                         "SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
4063                         intval($item["id"])
4064                 );
4065
4066                 if (!$r) {
4067                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
4068                         return false;
4069                 }
4070
4071                 $signature = $r[0];
4072
4073                 // Old way - is used by the internal Friendica functions
4074                 /// @todo Change all signatur storing functions to the new format
4075                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer']) {
4076                         $message = self::messageFromSignature($item, $signature);
4077                 } else {// New way
4078                         $msg = json_decode($signature['signed_text'], true);
4079
4080                         $message = [];
4081                         if (is_array($msg)) {
4082                                 foreach ($msg as $field => $data) {
4083                                         if (!$item["deleted"]) {
4084                                                 if ($field == "diaspora_handle") {
4085                                                         $field = "author";
4086                                                 }
4087                                                 if ($field == "target_type") {
4088                                                         $field = "parent_type";
4089                                                 }
4090                                         }
4091
4092                                         $message[$field] = $data;
4093                                 }
4094                         } else {
4095                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
4096                         }
4097                 }
4098
4099                 $message["parent_author_signature"] = self::signature($owner, $message);
4100
4101                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
4102
4103                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
4104         }
4105
4106         /**
4107          * @brief Sends a retraction (deletion) of a message, like or comment
4108          *
4109          * @param array $item         The item that will be exported
4110          * @param array $owner        the array of the item owner
4111          * @param array $contact      Target of the communication
4112          * @param bool  $public_batch Is it a public post?
4113          * @param bool  $relay        Is the retraction transmitted from a relay?
4114          *
4115          * @return int The result of the transmission
4116          */
4117         public static function sendRetraction($item, $owner, $contact, $public_batch = false, $relay = false)
4118         {
4119                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
4120
4121                 $msg_type = "retraction";
4122
4123                 if ($item['id'] == $item['parent']) {
4124                         $target_type = "Post";
4125                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4126                         $target_type = "Like";
4127                 } else {
4128                         $target_type = "Comment";
4129                 }
4130
4131                 $message = ["author" => $itemaddr,
4132                                 "target_guid" => $item['guid'],
4133                                 "target_type" => $target_type];
4134
4135                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
4136
4137                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
4138         }
4139
4140         /**
4141          * @brief Sends a mail
4142          *
4143          * @param array $item    The item that will be exported
4144          * @param array $owner   The owner
4145          * @param array $contact Target of the communication
4146          *
4147          * @return int The result of the transmission
4148          */
4149         public static function sendMail($item, $owner, $contact)
4150         {
4151                 $myaddr = self::myHandle($owner);
4152
4153                 $r = q(
4154                         "SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
4155                         intval($item["convid"]),
4156                         intval($item["uid"])
4157                 );
4158
4159                 if (!DBM::is_result($r)) {
4160                         logger("conversation not found.");
4161                         return;
4162                 }
4163                 $cnv = $r[0];
4164
4165                 $conv = [
4166                         "author" => $cnv["creator"],
4167                         "guid" => $cnv["guid"],
4168                         "subject" => $cnv["subject"],
4169                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4170                         "participants" => $cnv["recips"]
4171                 ];
4172
4173                 $body = BBCode::toMarkdown($item["body"]);
4174                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4175
4176                 $msg = [
4177                         "author" => $myaddr,
4178                         "guid" => $item["guid"],
4179                         "conversation_guid" => $cnv["guid"],
4180                         "text" => $body,
4181                         "created_at" => $created,
4182                 ];
4183
4184                 if ($item["reply"]) {
4185                         $message = $msg;
4186                         $type = "message";
4187                 } else {
4188                         $message = [
4189                                         "author" => $cnv["creator"],
4190                                         "guid" => $cnv["guid"],
4191                                         "subject" => $cnv["subject"],
4192                                         "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4193                                         "participants" => $cnv["recips"],
4194                                         "message" => $msg];
4195
4196                         $type = "conversation";
4197                 }
4198
4199                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4200         }
4201
4202         /**
4203          * @brief Split a name into first name and last name
4204          *
4205          * @param string $name The name
4206          *
4207          * @return array The array with "first" and "last"
4208          */
4209         public static function splitName($name) {
4210                 $name = trim($name);
4211
4212                 // Is the name longer than 64 characters? Then cut the rest of it.
4213                 if (strlen($name) > 64) {
4214                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4215                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4216                         } else {
4217                                 $name = substr($name, 0, 64);
4218                         }
4219                 }
4220
4221                 // Take the first word as first name
4222                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4223                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4224                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4225                         return ['first' => $first, 'last' => $last];
4226                 }
4227
4228                 // Take the last word as last name
4229                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4230                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4231
4232                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4233                         return ['first' => $first, 'last' => $last];
4234                 }
4235
4236                 // Take the first 32 characters if there is no space in the first 32 characters
4237                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4238                         $first = substr($name, 0, 32);
4239                         $last = substr($name, 32);
4240                         return ['first' => $first, 'last' => $last];
4241                 }
4242
4243                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4244                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4245
4246                 // Check if the last name is longer than 32 characters
4247                 if (strlen($last) > 32) {
4248                         if (strpos($last, ' ') <= 32) {
4249                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4250                         } else {
4251                                 $last = substr($last, 0, 32);
4252                         }
4253                 }
4254
4255                 return ['first' => $first, 'last' => $last];
4256         }
4257
4258         /**
4259          * @brief Create profile data
4260          *
4261          * @param int $uid The user id
4262          *
4263          * @return array The profile data
4264          */
4265         private static function createProfileData($uid)
4266         {
4267                 $r = q(
4268                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4269                         FROM `profile`
4270                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4271                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4272                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4273                         intval($uid)
4274                 );
4275
4276                 if (!$r) {
4277                         return [];
4278                 }
4279
4280                 $profile = $r[0];
4281                 $handle = $profile["addr"];
4282
4283                 $split_name = self::splitName($profile['name']);
4284                 $first = $split_name['first'];
4285                 $last = $split_name['last'];
4286
4287                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4288                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4289                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4290                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4291
4292                 $dob = null;
4293                 $about = null;
4294                 $location = null;
4295                 $tags = null;
4296                 if ($searchable === 'true') {
4297                         $dob = '';
4298
4299                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4300                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4301                                 if ($year < 1004) {
4302                                         $year = 1004;
4303                                 }
4304                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4305                         }
4306
4307                         $about = $profile['about'];
4308                         $about = strip_tags(BBCode::convert($about));
4309
4310                         $location = Profile::formatLocation($profile);
4311                         $tags = '';
4312                         if ($profile['pub_keywords']) {
4313                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4314                                 $kw = str_replace('  ', ' ', $kw);
4315                                 $arr = explode(' ', $profile['pub_keywords']);
4316                                 if (count($arr)) {
4317                                         for ($x = 0; $x < 5; $x ++) {
4318                                                 if (trim($arr[$x])) {
4319                                                         $tags .= '#'. trim($arr[$x]) .' ';
4320                                                 }
4321                                         }
4322                                 }
4323                         }
4324                         $tags = trim($tags);
4325                 }
4326
4327                 return ["author" => $handle,
4328                                 "first_name" => $first,
4329                                 "last_name" => $last,
4330                                 "image_url" => $large,
4331                                 "image_url_medium" => $medium,
4332                                 "image_url_small" => $small,
4333                                 "birthday" => $dob,
4334                                 "gender" => $profile['gender'],
4335                                 "bio" => $about,
4336                                 "location" => $location,
4337                                 "searchable" => $searchable,
4338                                 "nsfw" => "false",
4339                                 "tag_string" => $tags];
4340         }
4341
4342         /**
4343          * @brief Sends profile data
4344          *
4345          * @param int  $uid    The user id
4346          * @param bool $recips optional, default false
4347          * @return void
4348          */
4349         public static function sendProfile($uid, $recips = false)
4350         {
4351                 if (!$uid) {
4352                         return;
4353                 }
4354
4355                 $owner = User::getOwnerDataById($uid);
4356                 if (!$owner) {
4357                         return;
4358                 }
4359
4360                 if (!$recips) {
4361                         $recips = q(
4362                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4363                                 AND `uid` = %d AND `rel` != %d",
4364                                 dbesc(NETWORK_DIASPORA),
4365                                 intval($uid),
4366                                 intval(CONTACT_IS_SHARING)
4367                         );
4368                 }
4369
4370                 if (!$recips) {
4371                         return;
4372                 }
4373
4374                 $message = self::createProfileData($uid);
4375
4376                 foreach ($recips as $recip) {
4377                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
4378                         self::buildAndTransmit($owner, $recip, "profile", $message, false, "", false);
4379                 }
4380         }
4381
4382         /**
4383          * @brief Stores the signature for likes that are created on our system
4384          *
4385          * @param array $contact The contact array of the "like"
4386          * @param int   $post_id The post id of the "like"
4387          *
4388          * @return bool Success
4389          */
4390         public static function storeLikeSignature($contact, $post_id)
4391         {
4392                 // Is the contact the owner? Then fetch the private key
4393                 if (!$contact['self'] || ($contact['uid'] == 0)) {
4394                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
4395                         return false;
4396                 }
4397
4398                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
4399                 if (!DBM::is_result($r)) {
4400                         return false;
4401                 }
4402
4403                 $contact["uprvkey"] = $r[0]['prvkey'];
4404
4405                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
4406                 if (!DBM::is_result($r)) {
4407                         return false;
4408                 }
4409
4410                 if (!in_array($r[0]["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4411                         return false;
4412                 }
4413
4414                 $message = self::constructLike($r[0], $contact);
4415                 if ($message === false) {
4416                         return false;
4417                 }
4418
4419                 $message["author_signature"] = self::signature($contact, $message);
4420
4421                 /*
4422                  * Now store the signature more flexible to dynamically support new fields.
4423                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4424                  */
4425                 dba::insert('sign', ['iid' => $post_id, 'signed_text' => json_encode($message)]);
4426
4427                 logger('Stored diaspora like signature');
4428                 return true;
4429         }
4430
4431         /**
4432          * @brief Stores the signature for comments that are created on our system
4433          *
4434          * @param array  $item       The item array of the comment
4435          * @param array  $contact    The contact array of the item owner
4436          * @param string $uprvkey    The private key of the sender
4437          * @param int    $message_id The message id of the comment
4438          *
4439          * @return bool Success
4440          */
4441         public static function storeCommentSignature($item, $contact, $uprvkey, $message_id)
4442         {
4443                 if ($uprvkey == "") {
4444                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
4445                         return false;
4446                 }
4447
4448                 $contact["uprvkey"] = $uprvkey;
4449
4450                 $message = self::constructComment($item, $contact);
4451                 if ($message === false) {
4452                         return false;
4453                 }
4454
4455                 $message["author_signature"] = self::signature($contact, $message);
4456
4457                 /*
4458                  * Now store the signature more flexible to dynamically support new fields.
4459                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4460                  */
4461                 dba::insert('sign', ['iid' => $message_id, 'signed_text' => json_encode($message)]);
4462
4463                 logger('Stored diaspora comment signature');
4464                 return true;
4465         }
4466 }