src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @file include/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 namespace Friendica\Protocol;
  11
  12 use Friendica\App;
  13 use Friendica\Core\System;
  14 use Friendica\Core\Cache;
  15 use Friendica\Core\Config;
  16 use Friendica\Core\PConfig;
  17 use Friendica\Core\Worker;
  18 use Friendica\Database\DBM;
  19 use Friendica\Model\GlobalContact;
  20 use Friendica\Network\Probe;
  21 use Friendica\Object\Contact;
  22 use Friendica\Object\Profile;
  23 use Friendica\Util\XML;
  24
  25 use dba;
  26 use SimpleXMLElement;
  27
  28 require_once 'include/items.php';
  29 require_once 'include/bb2diaspora.php';
  30 require_once 'include/group.php';
  31 require_once 'include/datetime.php';
  32 require_once 'include/queue_fn.php';
  33
  34 /**
  35  * @brief This class contain functions to create and send Diaspora XML files
  36  *
  37  */
  38 class Diaspora
  39 {
  40
  41         /**
  42          * @brief Return a list of relay servers
  43          *
  44          * This is an experimental Diaspora feature.
  45          *
  46          * @return array of relay servers
  47          */
  48         public static function relayList()
  49         {
  50                 $serverdata = Config::get("system", "relay_server");
  51                 if ($serverdata == "") {
  52                         return array();
  53                 }
  54
  55                 $relay = array();
  56
  57                 $servers = explode(",", $serverdata);
  58
  59                 foreach ($servers as $server) {
  60                         $server = trim($server);
  61                         $addr = "relay@".str_replace("http://", "", normalise_link($server));
  62                         $batch = $server."/receive/public";
  63
  64                         $relais = q(
  65                                 "SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' AND `addr` = '%s' AND `nurl` = '%s' LIMIT 1",
  66                                 dbesc($batch),
  67                                 dbesc($addr),
  68                                 dbesc(normalise_link($server))
  69                         );
  70
  71                         if (!$relais) {
  72                                 $r = q(
  73                                         "INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
  74                                         VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
  75                                         datetime_convert(),
  76                                         dbesc($addr),
  77                                         dbesc($addr),
  78                                         dbesc($server),
  79                                         dbesc(normalise_link($server)),
  80                                         dbesc($batch),
  81                                         dbesc(NETWORK_DIASPORA),
  82                                         intval(CONTACT_IS_FOLLOWER),
  83                                         dbesc(datetime_convert()),
  84                                         dbesc(datetime_convert()),
  85                                         dbesc(datetime_convert())
  86                                 );
  87
  88                                 $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  89                                 if ($relais) {
  90                                         $relay[] = $relais[0];
  91                                 }
  92                         } else {
  93                                 $relay[] = $relais[0];
  94                         }
  95                 }
  96
  97                 return $relay;
  98         }
  99
 100         /**
 101          * @brief repairs a signature that was double encoded
 102          *
 103          * The function is unused at the moment. It was copied from the old implementation.
 104          *
 105          * @param string  $signature The signature
 106          * @param string  $handle    The handle of the signature owner
 107          * @param integer $level     This value is only set inside this function to avoid endless loops
 108          *
 109          * @return string the repaired signature
 110          */
 111         private static function repairSignature($signature, $handle = "", $level = 1)
 112         {
 113                 if ($signature == "") {
 114                         return ($signature);
 115                 }
 116
 117                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 118                         $signature = base64_decode($signature);
 119                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
 120
 121                         // Do a recursive call to be able to fix even multiple levels
 122                         if ($level < 10) {
 123                                 $signature = self::repairSignature($signature, $handle, ++$level);
 124                         }
 125                 }
 126
 127                 return($signature);
 128         }
 129
 130         /**
 131          * @brief verify the envelope and return the verified data
 132          *
 133          * @param string $envelope The magic envelope
 134          *
 135          * @return string verified data
 136          */
 137         private static function verifyMagicEnvelope($envelope)
 138         {
 139                 $basedom = parse_xml_string($envelope);
 140
 141                 if (!is_object($basedom)) {
 142                         logger("Envelope is no XML file");
 143                         return false;
 144                 }
 145
 146                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 147
 148                 if (sizeof($children) == 0) {
 149                         logger("XML has no children");
 150                         return false;
 151                 }
 152
 153                 $handle = "";
 154
 155                 $data = base64url_decode($children->data);
 156                 $type = $children->data->attributes()->type[0];
 157
 158                 $encoding = $children->encoding;
 159
 160                 $alg = $children->alg;
 161
 162                 $sig = base64url_decode($children->sig);
 163                 $key_id = $children->sig->attributes()->key_id[0];
 164                 if ($key_id != "") {
 165                         $handle = base64url_decode($key_id);
 166                 }
 167
 168                 $b64url_data = base64url_encode($data);
 169                 $msg = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
 170
 171                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 172
 173                 $key = self::key($handle);
 174
 175                 $verify = rsa_verify($signable_data, $sig, $key);
 176                 if (!$verify) {
 177                         logger('Message did not verify. Discarding.');
 178                         return false;
 179                 }
 180
 181                 return $data;
 182         }
 183
 184         /**
 185          * @brief encrypts data via AES
 186          *
 187          * @param string $key  The AES key
 188          * @param string $iv   The IV (is used for CBC encoding)
 189          * @param string $data The data that is to be encrypted
 190          *
 191          * @return string encrypted data
 192          */
 193         private static function aesEncrypt($key, $iv, $data)
 194         {
 195                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 196         }
 197
 198         /**
 199          * @brief decrypts data via AES
 200          *
 201          * @param string $key       The AES key
 202          * @param string $iv        The IV (is used for CBC encoding)
 203          * @param string $encrypted The encrypted data
 204          *
 205          * @return string decrypted data
 206          */
 207         private static function aesDecrypt($key, $iv, $encrypted)
 208         {
 209                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 210         }
 211
 212         /**
 213          * @brief: Decodes incoming Diaspora message in the new format
 214          *
 215          * @param array  $importer Array of the importer user
 216          * @param string $raw      raw post message
 217          *
 218          * @return array
 219          * 'message' -> decoded Diaspora XML message
 220          * 'author' -> author diaspora handle
 221          * 'key' -> author public key (converted to pkcs#8)
 222          */
 223         public static function decodeRaw($importer, $raw)
 224         {
 225                 $data = json_decode($raw);
 226
 227                 // Is it a private post? Then decrypt the outer Salmon
 228                 if (is_object($data)) {
 229                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 230                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 231
 232                         $outer_key_bundle = '';
 233                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 234                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 235
 236                         if (!is_object($j_outer_key_bundle)) {
 237                                 logger('Outer Salmon did not verify. Discarding.');
 238                                 http_status_exit(400);
 239                         }
 240
 241                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 242                         $outer_key = base64_decode($j_outer_key_bundle->key);
 243
 244                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 245                 } else {
 246                         $xml = $raw;
 247                 }
 248
 249                 $basedom = parse_xml_string($xml);
 250
 251                 if (!is_object($basedom)) {
 252                         logger('Received data does not seem to be an XML. Discarding. '.$xml);
 253                         http_status_exit(400);
 254                 }
 255
 256                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 257
 258                 // Not sure if this cleaning is needed
 259                 $data = str_replace(array(" ", "\t", "\r", "\n"), array("", "", "", ""), $base->data);
 260
 261                 // Build the signed data
 262                 $type = $base->data[0]->attributes()->type[0];
 263                 $encoding = $base->encoding;
 264                 $alg = $base->alg;
 265                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 266
 267                 // This is the signature
 268                 $signature = base64url_decode($base->sig);
 269
 270                 // Get the senders' public key
 271                 $key_id = $base->sig[0]->attributes()->key_id[0];
 272                 $author_addr = base64_decode($key_id);
 273                 $key = self::key($author_addr);
 274
 275                 $verify = rsa_verify($signed_data, $signature, $key);
 276                 if (!$verify) {
 277                         logger('Message did not verify. Discarding.');
 278                         http_status_exit(400);
 279                 }
 280
 281                 return array('message' => (string)base64url_decode($base->data),
 282                                 'author' => unxmlify($author_addr),
 283                                 'key' => (string)$key);
 284         }
 285
 286         /**
 287          * @brief: Decodes incoming Diaspora message in the deprecated format
 288          *
 289          * @param array  $importer Array of the importer user
 290          * @param string $xml      urldecoded Diaspora salmon
 291          *
 292          * @return array
 293          * 'message' -> decoded Diaspora XML message
 294          * 'author' -> author diaspora handle
 295          * 'key' -> author public key (converted to pkcs#8)
 296          */
 297         public static function decode($importer, $xml)
 298         {
 299                 $public = false;
 300                 $basedom = parse_xml_string($xml);
 301
 302                 if (!is_object($basedom)) {
 303                         logger("XML is not parseable.");
 304                         return false;
 305                 }
 306                 $children = $basedom->children('https://joindiaspora.com/protocol');
 307
 308                 if ($children->header) {
 309                         $public = true;
 310                         $author_link = str_replace('acct:', '', $children->header->author_id);
 311                 } else {
 312                         // This happens with posts from a relais
 313                         if (!$importer) {
 314                                 logger("This is no private post in the old format", LOGGER_DEBUG);
 315                                 return false;
 316                         }
 317
 318                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 319
 320                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 321                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 322
 323                         $outer_key_bundle = '';
 324                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 325
 326                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 327
 328                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 329                         $outer_key = base64_decode($j_outer_key_bundle->key);
 330
 331                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 332
 333                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 334                         $idom = parse_xml_string($decrypted);
 335
 336                         $inner_iv = base64_decode($idom->iv);
 337                         $inner_aes_key = base64_decode($idom->aes_key);
 338
 339                         $author_link = str_replace('acct:', '', $idom->author_id);
 340                 }
 341
 342                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 343
 344                 // figure out where in the DOM tree our data is hiding
 345
 346                 if ($dom->provenance->data) {
 347                         $base = $dom->provenance;
 348                 } elseif ($dom->env->data) {
 349                         $base = $dom->env;
 350                 } elseif ($dom->data) {
 351                         $base = $dom;
 352                 }
 353
 354                 if (!$base) {
 355                         logger('unable to locate salmon data in xml');
 356                         http_status_exit(400);
 357                 }
 358
 359
 360                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 361                 $signature = base64url_decode($base->sig);
 362
 363                 // unpack the  data
 364
 365                 // strip whitespace so our data element will return to one big base64 blob
 366                 $data = str_replace(array(" ", "\t", "\r", "\n"), array("", "", "", ""), $base->data);
 367
 368
 369                 // stash away some other stuff for later
 370
 371                 $type = $base->data[0]->attributes()->type[0];
 372                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 373                 $encoding = $base->encoding;
 374                 $alg = $base->alg;
 375
 376
 377                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 378
 379
 380                 // decode the data
 381                 $data = base64url_decode($data);
 382
 383
 384                 if ($public) {
 385                         $inner_decrypted = $data;
 386                 } else {
 387                         // Decode the encrypted blob
 388                         $inner_encrypted = base64_decode($data);
 389                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 390                 }
 391
 392                 if (!$author_link) {
 393                         logger('Could not retrieve author URI.');
 394                         http_status_exit(400);
 395                 }
 396                 // Once we have the author URI, go to the web and try to find their public key
 397                 // (first this will look it up locally if it is in the fcontact cache)
 398                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 399
 400                 logger('Fetching key for '.$author_link);
 401                 $key = self::key($author_link);
 402
 403                 if (!$key) {
 404                         logger('Could not retrieve author key.');
 405                         http_status_exit(400);
 406                 }
 407
 408                 $verify = rsa_verify($signed_data, $signature, $key);
 409
 410                 if (!$verify) {
 411                         logger('Message did not verify. Discarding.');
 412                         http_status_exit(400);
 413                 }
 414
 415                 logger('Message verified.');
 416
 417                 return array('message' => (string)$inner_decrypted,
 418                                 'author' => unxmlify($author_link),
 419                                 'key' => (string)$key);
 420         }
 421
 422
 423         /**
 424          * @brief Dispatches public messages and find the fitting receivers
 425          *
 426          * @param array $msg The post that will be dispatched
 427          *
 428          * @return int The message id of the generated message, "true" or "false" if there was an error
 429          */
 430         public static function dispatchPublic($msg)
 431         {
 432                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 433                 if (!$enabled) {
 434                         logger("diaspora is disabled");
 435                         return false;
 436                 }
 437
 438                 if (!($postdata = self::validPosting($msg))) {
 439                         logger("Invalid posting");
 440                         return false;
 441                 }
 442
 443                 $fields = $postdata['fields'];
 444
 445                 // Is it a an action (comment, like, ...) for our own post?
 446                 if (isset($fields->parent_guid) && !$postdata["relayed"]) {
 447                         $guid = notags(unxmlify($fields->parent_guid));
 448                         $importer = self::importerForGuid($guid);
 449                         if (is_array($importer)) {
 450                                 logger("delivering to origin: ".$importer["name"]);
 451                                 $message_id = self::dispatch($importer, $msg, $fields);
 452                                 return $message_id;
 453                         }
 454                 }
 455
 456                 // Process item retractions. This has to be done separated from the other stuff,
 457                 // since retractions for comments could come even from non followers.
 458                 if (!empty($fields) && in_array($fields->getName(), array('retraction'))) {
 459                         $target = notags(unxmlify($fields->target_type));
 460                         if (in_array($target, array("Comment", "Like", "Post", "Reshare", "StatusMessage"))) {
 461                                 logger('processing retraction for '.$target, LOGGER_DEBUG);
 462                                 $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 463                                 $message_id = self::dispatch($importer, $msg, $fields);
 464                                 return $message_id;
 465                         }
 466                 }
 467
 468                 // Now distribute it to the followers
 469                 $r = q(
 470                         "SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 471                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 472                         AND NOT `account_expired` AND NOT `account_removed`",
 473                         dbesc(NETWORK_DIASPORA),
 474                         dbesc($msg["author"])
 475                 );
 476
 477                 if (DBM::is_result($r)) {
 478                         foreach ($r as $rr) {
 479                                 logger("delivering to: ".$rr["username"]);
 480                                 self::dispatch($rr, $msg, $fields);
 481                         }
 482                 } elseif (!Config::get('system', 'relay_subscribe', false)) {
 483                         logger("Unwanted message from ".$msg["author"]." send by ".$_SERVER["REMOTE_ADDR"]." with ".$_SERVER["HTTP_USER_AGENT"].": ".print_r($msg, true), LOGGER_DEBUG);
 484                 } else {
 485                         // Use a dummy importer to import the data for the public copy
 486                         $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 487                         $message_id = self::dispatch($importer, $msg, $fields);
 488                 }
 489
 490                 return $message_id;
 491         }
 492
 493         /**
 494          * @brief Dispatches the different message types to the different functions
 495          *
 496          * @param array  $importer Array of the importer user
 497          * @param array  $msg      The post that will be dispatched
 498          * @param object $fields   SimpleXML object that contains the message
 499          *
 500          * @return int The message id of the generated message, "true" or "false" if there was an error
 501          */
 502         public static function dispatch($importer, $msg, $fields = null)
 503         {
 504                 // The sender is the handle of the contact that sent the message.
 505                 // This will often be different with relayed messages (for example "like" and "comment")
 506                 $sender = $msg["author"];
 507
 508                 // This is only needed for private postings since this is already done for public ones before
 509                 if (is_null($fields)) {
 510                         if (!($postdata = self::validPosting($msg))) {
 511                                 logger("Invalid posting");
 512                                 return false;
 513                         }
 514                         $fields = $postdata['fields'];
 515                 }
 516
 517                 $type = $fields->getName();
 518
 519                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 520
 521                 switch ($type) {
 522                         case "account_migration":
 523                                 return self::receiveAccountMigration($importer, $fields);
 524
 525                         case "account_deletion":
 526                                 return self::receiveAccountDeletion($importer, $fields);
 527
 528                         case "comment":
 529                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 530
 531                         case "contact":
 532                                 return self::receiveContactRequest($importer, $fields);
 533
 534                         case "conversation":
 535                                 return self::receiveConversation($importer, $msg, $fields);
 536
 537                         case "like":
 538                                 return self::receiveLike($importer, $sender, $fields);
 539
 540                         case "message":
 541                                 return self::receiveMessage($importer, $fields);
 542
 543                         case "participation": // Not implemented
 544                                 return self::receiveParticipation($importer, $fields);
 545
 546                         case "photo": // Not implemented
 547                                 return self::receivePhoto($importer, $fields);
 548
 549                         case "poll_participation": // Not implemented
 550                                 return self::receivePollParticipation($importer, $fields);
 551
 552                         case "profile":
 553                                 return self::receiveProfile($importer, $fields);
 554
 555                         case "reshare":
 556                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 557
 558                         case "retraction":
 559                                 return self::receiveRetraction($importer, $sender, $fields);
 560
 561                         case "status_message":
 562                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 563
 564                         default:
 565                                 logger("Unknown message type ".$type);
 566                                 return false;
 567                 }
 568
 569                 return true;
 570         }
 571
 572         /**
 573          * @brief Checks if a posting is valid and fetches the data fields.
 574          *
 575          * This function does not only check the signature.
 576          * It also does the conversion between the old and the new diaspora format.
 577          *
 578          * @param array $msg Array with the XML, the sender handle and the sender signature
 579          *
 580          * @return bool|array If the posting is valid then an array with an SimpleXML object is returned
 581          */
 582         private static function validPosting($msg)
 583         {
 584                 $data = parse_xml_string($msg["message"]);
 585
 586                 if (!is_object($data)) {
 587                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 588                         return false;
 589                 }
 590
 591                 $first_child = $data->getName();
 592
 593                 // Is this the new or the old version?
 594                 if ($data->getName() == "XML") {
 595                         $oldXML = true;
 596                         foreach ($data->post->children() as $child) {
 597                                 $element = $child;
 598                         }
 599                 } else {
 600                         $oldXML = false;
 601                         $element = $data;
 602                 }
 603
 604                 $type = $element->getName();
 605                 $orig_type = $type;
 606
 607                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 608
 609                 // All retractions are handled identically from now on.
 610                 // In the new version there will only be "retraction".
 611                 if (in_array($type, array("signed_retraction", "relayable_retraction")))
 612                         $type = "retraction";
 613
 614                 if ($type == "request") {
 615                         $type = "contact";
 616                 }
 617
 618                 $fields = new SimpleXMLElement("<".$type."/>");
 619
 620                 $signed_data = "";
 621
 622                 foreach ($element->children() as $fieldname => $entry) {
 623                         if ($oldXML) {
 624                                 // Translation for the old XML structure
 625                                 if ($fieldname == "diaspora_handle") {
 626                                         $fieldname = "author";
 627                                 }
 628                                 if ($fieldname == "participant_handles") {
 629                                         $fieldname = "participants";
 630                                 }
 631                                 if (in_array($type, array("like", "participation"))) {
 632                                         if ($fieldname == "target_type") {
 633                                                 $fieldname = "parent_type";
 634                                         }
 635                                 }
 636                                 if ($fieldname == "sender_handle") {
 637                                         $fieldname = "author";
 638                                 }
 639                                 if ($fieldname == "recipient_handle") {
 640                                         $fieldname = "recipient";
 641                                 }
 642                                 if ($fieldname == "root_diaspora_id") {
 643                                         $fieldname = "root_author";
 644                                 }
 645                                 if ($type == "status_message") {
 646                                         if ($fieldname == "raw_message") {
 647                                                 $fieldname = "text";
 648                                         }
 649                                 }
 650                                 if ($type == "retraction") {
 651                                         if ($fieldname == "post_guid") {
 652                                                 $fieldname = "target_guid";
 653                                         }
 654                                         if ($fieldname == "type") {
 655                                                 $fieldname = "target_type";
 656                                         }
 657                                 }
 658                         }
 659
 660                         if (($fieldname == "author_signature") && ($entry != "")) {
 661                                 $author_signature = base64_decode($entry);
 662                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 663                                 $parent_author_signature = base64_decode($entry);
 664                         } elseif (!in_array($fieldname, array("author_signature", "parent_author_signature", "target_author_signature"))) {
 665                                 if ($signed_data != "") {
 666                                         $signed_data .= ";";
 667                                         $signed_data_parent .= ";";
 668                                 }
 669
 670                                 $signed_data .= $entry;
 671                         }
 672                         if (!in_array($fieldname, array("parent_author_signature", "target_author_signature"))
 673                                 || ($orig_type == "relayable_retraction")
 674                         ) {
 675                                 XML::copy($entry, $fields, $fieldname);
 676                         }
 677                 }
 678
 679                 // This is something that shouldn't happen at all.
 680                 if (in_array($type, array("status_message", "reshare", "profile"))) {
 681                         if ($msg["author"] != $fields->author) {
 682                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 683                                 return false;
 684                         }
 685                 }
 686
 687                 // Only some message types have signatures. So we quit here for the other types.
 688                 if (!in_array($type, array("comment", "like"))) {
 689                         return array("fields" => $fields, "relayed" => false);
 690                 }
 691                 // No author_signature? This is a must, so we quit.
 692                 if (!isset($author_signature)) {
 693                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 694                         return false;
 695                 }
 696
 697                 if (isset($parent_author_signature)) {
 698                         $relayed = true;
 699
 700                         $key = self::key($msg["author"]);
 701
 702                         if (!rsa_verify($signed_data, $parent_author_signature, $key, "sha256")) {
 703                                 logger("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 704                                 return false;
 705                         }
 706                 } else {
 707                         $relayed = false;
 708                 }
 709
 710                 $key = self::key($fields->author);
 711
 712                 if (!rsa_verify($signed_data, $author_signature, $key, "sha256")) {
 713                         logger("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 714                         return false;
 715                 } else {
 716                         return array("fields" => $fields, "relayed" => $relayed);
 717                 }
 718         }
 719
 720         /**
 721          * @brief Fetches the public key for a given handle
 722          *
 723          * @param string $handle The handle
 724          *
 725          * @return string The public key
 726          */
 727         private static function key($handle)
 728         {
 729                 $handle = strval($handle);
 730
 731                 logger("Fetching diaspora key for: ".$handle);
 732
 733                 $r = self::personByHandle($handle);
 734                 if ($r) {
 735                         return $r["pubkey"];
 736                 }
 737
 738                 return "";
 739         }
 740
 741         /**
 742          * @brief Fetches data for a given handle
 743          *
 744          * @param string $handle The handle
 745          *
 746          * @return array the queried data
 747          */
 748         public static function personByHandle($handle)
 749         {
 750                 $r = q(
 751                         "SELECT * FROM `fcontact` WHERE `network` = '%s' AND `addr` = '%s' LIMIT 1",
 752                         dbesc(NETWORK_DIASPORA),
 753                         dbesc($handle)
 754                 );
 755                 if ($r) {
 756                         $person = $r[0];
 757                         logger("In cache " . print_r($r, true), LOGGER_DEBUG);
 758
 759                         // update record occasionally so it doesn't get stale
 760                         $d = strtotime($person["updated"]." +00:00");
 761                         if ($d < strtotime("now - 14 days")) {
 762                                 $update = true;
 763                         }
 764
 765                         if ($person["guid"] == "") {
 766                                 $update = true;
 767                         }
 768                 }
 769
 770                 if (!$person || $update) {
 771                         logger("create or refresh", LOGGER_DEBUG);
 772                         $r = Probe::uri($handle, NETWORK_DIASPORA);
 773
 774                         // Note that Friendica contacts will return a "Diaspora person"
 775                         // if Diaspora connectivity is enabled on their server
 776                         if ($r && ($r["network"] === NETWORK_DIASPORA)) {
 777                                 self::addFContact($r, $update);
 778                                 $person = $r;
 779                         }
 780                 }
 781                 return $person;
 782         }
 783
 784         /**
 785          * @brief Updates the fcontact table
 786          *
 787          * @param array $arr    The fcontact data
 788          * @param bool  $update Update or insert?
 789          *
 790          * @return string The id of the fcontact entry
 791          */
 792         private static function addFContact($arr, $update = false)
 793         {
 794                 if ($update) {
 795                         $r = q(
 796                                 "UPDATE `fcontact` SET
 797                                         `name` = '%s',
 798                                         `photo` = '%s',
 799                                         `request` = '%s',
 800                                         `nick` = '%s',
 801                                         `addr` = '%s',
 802                                         `guid` = '%s',
 803                                         `batch` = '%s',
 804                                         `notify` = '%s',
 805                                         `poll` = '%s',
 806                                         `confirm` = '%s',
 807                                         `alias` = '%s',
 808                                         `pubkey` = '%s',
 809                                         `updated` = '%s'
 810                                 WHERE `url` = '%s' AND `network` = '%s'",
 811                                 dbesc($arr["name"]),
 812                                 dbesc($arr["photo"]),
 813                                 dbesc($arr["request"]),
 814                                 dbesc($arr["nick"]),
 815                                 dbesc(strtolower($arr["addr"])),
 816                                 dbesc($arr["guid"]),
 817                                 dbesc($arr["batch"]),
 818                                 dbesc($arr["notify"]),
 819                                 dbesc($arr["poll"]),
 820                                 dbesc($arr["confirm"]),
 821                                 dbesc($arr["alias"]),
 822                                 dbesc($arr["pubkey"]),
 823                                 dbesc(datetime_convert()),
 824                                 dbesc($arr["url"]),
 825                                 dbesc($arr["network"])
 826                         );
 827                 } else {
 828                         $r = q(
 829                                 "INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`, `guid`,
 830                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 831                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 832                                 dbesc($arr["url"]),
 833                                 dbesc($arr["name"]),
 834                                 dbesc($arr["photo"]),
 835                                 dbesc($arr["request"]),
 836                                 dbesc($arr["nick"]),
 837                                 dbesc($arr["addr"]),
 838                                 dbesc($arr["guid"]),
 839                                 dbesc($arr["batch"]),
 840                                 dbesc($arr["notify"]),
 841                                 dbesc($arr["poll"]),
 842                                 dbesc($arr["confirm"]),
 843                                 dbesc($arr["network"]),
 844                                 dbesc($arr["alias"]),
 845                                 dbesc($arr["pubkey"]),
 846                                 dbesc(datetime_convert())
 847                         );
 848                 }
 849
 850                 return $r;
 851         }
 852
 853         /**
 854          * @brief get a handle (user@domain.tld) from a given contact id or gcontact id
 855          *
 856          * @param int $contact_id  The id in the contact table
 857          * @param int $gcontact_id The id in the gcontact table
 858          *
 859          * @return string the handle
 860          */
 861         public static function handleFromContact($contact_id, $gcontact_id = 0)
 862         {
 863                 $handle = false;
 864
 865                 logger("contact id is ".$contact_id." - gcontact id is ".$gcontact_id, LOGGER_DEBUG);
 866
 867                 if ($gcontact_id != 0) {
 868                         $r = q(
 869                                 "SELECT `addr` FROM `gcontact` WHERE `id` = %d AND `addr` != ''",
 870                                 intval($gcontact_id)
 871                         );
 872
 873                         if (DBM::is_result($r)) {
 874                                 return strtolower($r[0]["addr"]);
 875                         }
 876                 }
 877
 878                 $r = q(
 879                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 880                         intval($contact_id)
 881                 );
 882
 883                 if (DBM::is_result($r)) {
 884                         $contact = $r[0];
 885
 886                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 887
 888                         if ($contact['addr'] != "") {
 889                                 $handle = $contact['addr'];
 890                         } else {
 891                                 $baseurl_start = strpos($contact['url'], '://') + 3;
 892                                 // allows installations in a subdirectory--not sure how Diaspora will handle
 893                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
 894                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 895                                 $handle = $contact['nick'].'@'.$baseurl;
 896                         }
 897                 }
 898
 899                 return strtolower($handle);
 900         }
 901
 902         /**
 903          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
 904          * fcontact guid
 905          *
 906          * @param mixed $fcontact_guid Hexadecimal string guid
 907          *
 908          * @return string the contact url or null
 909          */
 910         public static function urlFromContactGuid($fcontact_guid)
 911         {
 912                 logger("fcontact guid is ".$fcontact_guid, LOGGER_DEBUG);
 913
 914                 $r = q(
 915                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
 916                         dbesc(NETWORK_DIASPORA),
 917                         dbesc($fcontact_guid)
 918                 );
 919
 920                 if (DBM::is_result($r)) {
 921                         return $r[0]['url'];
 922                 }
 923
 924                 return null;
 925         }
 926
 927         /**
 928          * @brief Get a contact id for a given handle
 929          *
 930          * @param int    $uid    The user id
 931          * @param string $handle The handle in the format user@domain.tld
 932          *
 933          * @return The contact id
 934          */
 935         private static function contactByHandle($uid, $handle)
 936         {
 937                 // First do a direct search on the contact table
 938                 $r = q(
 939                         "SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
 940                         intval($uid),
 941                         dbesc($handle)
 942                 );
 943
 944                 if (DBM::is_result($r)) {
 945                         return $r[0];
 946                 } else {
 947                         /*
 948                          * We haven't found it?
 949                          * We use another function for it that will possibly create a contact entry.
 950                          */
 951                         $cid = Contact::getIdForURL($handle, $uid);
 952
 953                         if ($cid > 0) {
 954                                 /// @TODO Contact retrieval should be encapsulated into an "entity" class like `Contact`
 955                                 $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($cid));
 956
 957                                 if (DBM::is_result($r)) {
 958                                         return $r[0];
 959                                 }
 960                         }
 961                 }
 962
 963                 $handle_parts = explode("@", $handle);
 964                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
 965                 $r = q(
 966                         "SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
 967                         dbesc(NETWORK_DFRN),
 968                         intval($uid),
 969                         dbesc($nurl_sql)
 970                 );
 971                 if (DBM::is_result($r)) {
 972                         return $r[0];
 973                 }
 974
 975                 logger("Haven't found contact for user ".$uid." and handle ".$handle, LOGGER_DEBUG);
 976                 return false;
 977         }
 978
 979         /**
 980          * @brief Check if posting is allowed for this contact
 981          *
 982          * @param array $importer   Array of the importer user
 983          * @param array $contact    The contact that is checked
 984          * @param bool  $is_comment Is the check for a comment?
 985          *
 986          * @return bool is the contact allowed to post?
 987          */
 988         private static function postAllow($importer, $contact, $is_comment = false)
 989         {
 990                 /*
 991                  * Perhaps we were already sharing with this person. Now they're sharing with us.
 992                  * That makes us friends.
 993                  * Normally this should have handled by getting a request - but this could get lost
 994                  */
 995                 if ($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
 996                         dba::update(
 997                                 'contact',
 998                                 array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
 999                                 array('id' => $contact["id"], 'uid' => $contact["uid"])
1000                         );
1001
1002                         $contact["rel"] = CONTACT_IS_FRIEND;
1003                         logger("defining user ".$contact["nick"]." as friend");
1004                 }
1005
1006                 // We don't seem to like that person
1007                 if ($contact["blocked"] || $contact["readonly"] || $contact["archive"]) {
1008                         // Maybe blocked, don't accept.
1009                         return false;
1010                         // We are following this person?
1011                 } elseif (($contact["rel"] == CONTACT_IS_SHARING) || ($contact["rel"] == CONTACT_IS_FRIEND)) {
1012                         // Yes, then it is fine.
1013                         return true;
1014                         // Is it a post to a community?
1015                 } elseif (($contact["rel"] == CONTACT_IS_FOLLOWER) && ($importer["page-flags"] == PAGE_COMMUNITY)) {
1016                         // That's good
1017                         return true;
1018                         // Is the message a global user or a comment?
1019                 } elseif (($importer["uid"] == 0) || $is_comment) {
1020                         // Messages for the global users and comments are always accepted
1021                         return true;
1022                 }
1023
1024                 return false;
1025         }
1026
1027         /**
1028          * @brief Fetches the contact id for a handle and checks if posting is allowed
1029          *
1030          * @param array  $importer   Array of the importer user
1031          * @param string $handle     The checked handle in the format user@domain.tld
1032          * @param bool   $is_comment Is the check for a comment?
1033          *
1034          * @return array The contact data
1035          */
1036         private static function allowedContactByHandle($importer, $handle, $is_comment = false)
1037         {
1038                 $contact = self::contactByHandle($importer["uid"], $handle);
1039                 if (!$contact) {
1040                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1041                         // If a contact isn't found, we accept it anyway if it is a comment
1042                         if ($is_comment) {
1043                                 return $importer;
1044                         } else {
1045                                 return false;
1046                         }
1047                 }
1048
1049                 if (!self::postAllow($importer, $contact, $is_comment)) {
1050                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1051                         return false;
1052                 }
1053                 return $contact;
1054         }
1055
1056         /**
1057          * @brief Does the message already exists on the system?
1058          *
1059          * @param int    $uid  The user id
1060          * @param string $guid The guid of the message
1061          *
1062          * @return int|bool message id if the message already was stored into the system - or false.
1063          */
1064         private static function messageExists($uid, $guid)
1065         {
1066                 $r = q(
1067                         "SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1068                         intval($uid),
1069                         dbesc($guid)
1070                 );
1071
1072                 if (DBM::is_result($r)) {
1073                         logger("message ".$guid." already exists for user ".$uid);
1074                         return $r[0]["id"];
1075                 }
1076
1077                 return false;
1078         }
1079
1080         /**
1081          * @brief Checks for links to posts in a message
1082          *
1083          * @param array $item The item array
1084          * @return void
1085          */
1086         private static function fetchGuid($item)
1087         {
1088                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1089                 preg_replace_callback(
1090                         $expression,
1091                         function ($match) use ($item) {
1092                                 return self::fetchGuidSub($match, $item);
1093                         },
1094                         $item["body"]
1095                 );
1096
1097                 preg_replace_callback(
1098                         "&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1099                         function ($match) use ($item) {
1100                                 return self::fetchGuidSub($match, $item);
1101                         },
1102                         $item["body"]
1103                 );
1104         }
1105
1106         /**
1107          * @brief Checks for relative /people/* links in an item body to match local
1108          * contacts or prepends the remote host taken from the author link.
1109          *
1110          * @param string $body        The item body to replace links from
1111          * @param string $author_link The author link for missing local contact fallback
1112          *
1113          * @return the replaced string
1114          */
1115         public static function replacePeopleGuid($body, $author_link)
1116         {
1117                 $return = preg_replace_callback(
1118                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1119                         function ($match) use ($author_link) {
1120                                 // $match
1121                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1122                                 // 1 => '0123456789abcdef'
1123                                 // 2 => 'Foo Bar'
1124                                 $handle = self::urlFromContactGuid($match[1]);
1125
1126                                 if ($handle) {
1127                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1128                                 } else {
1129                                         // No local match, restoring absolute remote URL from author scheme and host
1130                                         $author_url = parse_url($author_link);
1131                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1132                                 }
1133
1134                                 return $return;
1135                         },
1136                         $body
1137                 );
1138
1139                 return $return;
1140         }
1141
1142         /**
1143          * @brief sub function of "fetchGuid" which checks for links in messages
1144          *
1145          * @param array $match array containing a link that has to be checked for a message link
1146          * @param array $item  The item array
1147          * @return void
1148          */
1149         private static function fetchGuidSub($match, $item)
1150         {
1151                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1152                         self::storeByGuid($match[1], $item["owner-link"]);
1153                 }
1154         }
1155
1156         /**
1157          * @brief Fetches an item with a given guid from a given server
1158          *
1159          * @param string $guid   the message guid
1160          * @param string $server The server address
1161          * @param int    $uid    The user id of the user
1162          *
1163          * @return int the message id of the stored message or false
1164          */
1165         private static function storeByGuid($guid, $server, $uid = 0)
1166         {
1167                 $serverparts = parse_url($server);
1168                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1169
1170                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
1171
1172                 $msg = self::message($guid, $server);
1173
1174                 if (!$msg) {
1175                         return false;
1176                 }
1177
1178                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
1179
1180                 // Now call the dispatcher
1181                 return self::dispatchPublic($msg);
1182         }
1183
1184         /**
1185          * @brief Fetches a message from a server
1186          *
1187          * @param string $guid   message guid
1188          * @param string $server The url of the server
1189          * @param int    $level  Endless loop prevention
1190          *
1191          * @return array
1192          *      'message' => The message XML
1193          *      'author' => The author handle
1194          *      'key' => The public key of the author
1195          */
1196         private static function message($guid, $server, $level = 0)
1197         {
1198                 if ($level > 5) {
1199                         return false;
1200                 }
1201
1202                 // This will work for new Diaspora servers and Friendica servers from 3.5
1203                 $source_url = $server."/fetch/post/".urlencode($guid);
1204
1205                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1206
1207                 $envelope = fetch_url($source_url);
1208                 if ($envelope) {
1209                         logger("Envelope was fetched.", LOGGER_DEBUG);
1210                         $x = self::verifyMagicEnvelope($envelope);
1211                         if (!$x) {
1212                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
1213                         } else {
1214                                 logger("Envelope was verified.", LOGGER_DEBUG);
1215                         }
1216                 } else {
1217                         $x = false;
1218                 }
1219
1220                 // This will work for older Diaspora and Friendica servers
1221                 if (!$x) {
1222                         $source_url = $server."/p/".urlencode($guid).".xml";
1223                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1224
1225                         $x = fetch_url($source_url);
1226                         if (!$x) {
1227                                 return false;
1228                         }
1229                 }
1230
1231                 $source_xml = parse_xml_string($x);
1232
1233                 if (!is_object($source_xml)) {
1234                         return false;
1235                 }
1236
1237                 if ($source_xml->post->reshare) {
1238                         // Reshare of a reshare - old Diaspora version
1239                         logger("Message is a reshare", LOGGER_DEBUG);
1240                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1241                 } elseif ($source_xml->getName() == "reshare") {
1242                         // Reshare of a reshare - new Diaspora version
1243                         logger("Message is a new reshare", LOGGER_DEBUG);
1244                         return self::message($source_xml->root_guid, $server, ++$level);
1245                 }
1246
1247                 $author = "";
1248
1249                 // Fetch the author - for the old and the new Diaspora version
1250                 if ($source_xml->post->status_message->diaspora_handle) {
1251                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1252                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1253                         $author = (string)$source_xml->author;
1254                 }
1255
1256                 // If this isn't a "status_message" then quit
1257                 if (!$author) {
1258                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
1259                         return false;
1260                 }
1261
1262                 $msg = array("message" => $x, "author" => $author);
1263
1264                 $msg["key"] = self::key($msg["author"]);
1265
1266                 return $msg;
1267         }
1268
1269         /**
1270          * @brief Fetches the item record of a given guid
1271          *
1272          * @param int    $uid     The user id
1273          * @param string $guid    message guid
1274          * @param string $author  The handle of the item
1275          * @param array  $contact The contact of the item owner
1276          *
1277          * @return array the item record
1278          */
1279         private static function parentItem($uid, $guid, $author, $contact)
1280         {
1281                 $r = q(
1282                         "SELECT `id`, `parent`, `body`, `wall`, `uri`, `guid`, `private`, `origin`,
1283                                 `author-name`, `author-link`, `author-avatar`,
1284                                 `owner-name`, `owner-link`, `owner-avatar`
1285                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1286                         intval($uid),
1287                         dbesc($guid)
1288                 );
1289
1290                 if (!$r) {
1291                         $result = self::storeByGuid($guid, $contact["url"], $uid);
1292
1293                         if (!$result) {
1294                                 $person = self::personByHandle($author);
1295                                 $result = self::storeByGuid($guid, $person["url"], $uid);
1296                         }
1297
1298                         if ($result) {
1299                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
1300
1301                                 $r = q(
1302                                         "SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
1303                                                 `author-name`, `author-link`, `author-avatar`,
1304                                                 `owner-name`, `owner-link`, `owner-avatar`
1305                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1306                                         intval($uid),
1307                                         dbesc($guid)
1308                                 );
1309                         }
1310                 }
1311
1312                 if (!$r) {
1313                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
1314                         return false;
1315                 } else {
1316                         logger("parent item found: parent: ".$guid." - user: ".$uid);
1317                         return $r[0];
1318                 }
1319         }
1320
1321         /**
1322          * @brief returns contact details
1323          *
1324          * @param array $contact The default contact if the person isn't found
1325          * @param array $person  The record of the person
1326          * @param int   $uid     The user id
1327          *
1328          * @return array
1329          *      'cid' => contact id
1330          *      'network' => network type
1331          */
1332         private static function authorContactByUrl($contact, $person, $uid)
1333         {
1334                 $r = q(
1335                         "SELECT `id`, `network`, `url` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
1336                         dbesc(normalise_link($person["url"])),
1337                         intval($uid)
1338                 );
1339                 if ($r) {
1340                         $cid = $r[0]["id"];
1341                         $network = $r[0]["network"];
1342
1343                         // We are receiving content from a user that possibly is about to be terminated
1344                         // This means the user is vital, so we remove a possible termination date.
1345                         Contact::unmarkForArchival($r[0]);
1346                 } else {
1347                         $cid = $contact["id"];
1348                         $network = NETWORK_DIASPORA;
1349                 }
1350
1351                 return array("cid" => $cid, "network" => $network);
1352         }
1353
1354         /**
1355          * @brief Is the profile a hubzilla profile?
1356          *
1357          * @param string $url The profile link
1358          *
1359          * @return bool is it a hubzilla server?
1360          */
1361         public static function isRedmatrix($url)
1362         {
1363                 return(strstr($url, "/channel/"));
1364         }
1365
1366         /**
1367          * @brief Generate a post link with a given handle and message guid
1368          *
1369          * @param string $addr        The user handle
1370          * @param string $guid        message guid
1371          * @param string $parent_guid optional parent guid
1372          *
1373          * @return string the post link
1374          */
1375         private static function plink($addr, $guid, $parent_guid = '')
1376         {
1377                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
1378
1379                 // Fallback
1380                 if (!DBM::is_result($r)) {
1381                         if ($parent_guid != '') {
1382                                 return "https://".substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1383                         } else {
1384                                 return "https://".substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1385                         }
1386                 }
1387
1388                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
1389                 // So we try another way as well.
1390                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
1391                 if (DBM::is_result($s)) {
1392                         $r[0]["network"] = $s[0]["network"];
1393                 }
1394
1395                 if ($r[0]["network"] == NETWORK_DFRN) {
1396                         return str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/");
1397                 }
1398
1399                 if (self::isRedmatrix($r[0]["url"])) {
1400                         return $r[0]["url"]."/?f=&mid=".$guid;
1401                 }
1402
1403                 if ($parent_guid != '') {
1404                         return "https://".substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1405                 } else {
1406                         return "https://".substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1407                 }
1408         }
1409
1410         /**
1411          * @brief Receives account migration
1412          *
1413          * @param array  $importer Array of the importer user
1414          * @param object $data     The message object
1415          *
1416          * @return bool Success
1417          */
1418         private static function receiveAccountMigration($importer, $data)
1419         {
1420                 $old_handle = notags(unxmlify($data->author));
1421                 $new_handle = notags(unxmlify($data->profile->author));
1422                 $signature = notags(unxmlify($data->signature));
1423
1424                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1425                 if (!$contact) {
1426                         logger("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1427                         return false;
1428                 }
1429
1430                 logger("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1431
1432                 // Check signature
1433                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1434                 $key = self::key($old_handle);
1435                 if (!rsa_verify($signed_text, $signature, $key, "sha256")) {
1436                         logger('No valid signature for migration.');
1437                         return false;
1438                 }
1439
1440                 // Update the profile
1441                 self::receiveProfile($importer, $data->profile);
1442
1443                 // change the technical stuff in contact and gcontact
1444                 $data = Probe::uri($new_handle);
1445                 if ($data['network'] == NETWORK_PHANTOM) {
1446                         logger('Account for '.$new_handle." couldn't be probed.");
1447                         return false;
1448                 }
1449
1450                 $fields = array('url' => $data['url'], 'nurl' => normalise_link($data['url']),
1451                                 'name' => $data['name'], 'nick' => $data['nick'],
1452                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1453                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1454                                 'network' => $data['network']);
1455
1456                 dba::update('contact', $fields, array('addr' => $old_handle));
1457
1458                 $fields = array('url' => $data['url'], 'nurl' => normalise_link($data['url']),
1459                                 'name' => $data['name'], 'nick' => $data['nick'],
1460                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1461                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1462                                 'server_url' => $data['baseurl'], 'network' => $data['network']);
1463
1464                 dba::update('gcontact', $fields, array('addr' => $old_handle));
1465
1466                 logger('Contacts are updated.');
1467
1468                 // update items
1469                 /// @todo This is an extreme performance killer
1470                 $fields = array(
1471                         'owner-link' => array($contact["url"], $data["url"]),
1472                         'author-link' => array($contact["url"], $data["url"]),
1473                 );
1474                 foreach ($fields as $n => $f) {
1475                         $r = q(
1476                                 "SELECT `id` FROM `item` WHERE `%s` = '%s' AND `uid` = %d LIMIT 1",
1477                                 $n,
1478                                 dbesc($f[0]),
1479                                 intval($importer["uid"])
1480                         );
1481
1482                         if (DBM::is_result($r)) {
1483                                 $x = q(
1484                                         "UPDATE `item` SET `%s` = '%s' WHERE `%s` = '%s' AND `uid` = %d",
1485                                         $n,
1486                                         dbesc($f[1]),
1487                                         $n,
1488                                         dbesc($f[0]),
1489                                         intval($importer["uid"])
1490                                 );
1491
1492                                 if ($x === false) {
1493                                         return false;
1494                                 }
1495                         }
1496                 }
1497
1498                 logger('Items are updated.');
1499
1500                 return true;
1501         }
1502
1503         /**
1504          * @brief Processes an account deletion
1505          *
1506          * @param array  $importer Array of the importer user
1507          * @param object $data     The message object
1508          *
1509          * @return bool Success
1510          */
1511         private static function receiveAccountDeletion($importer, $data)
1512         {
1513                 /// @todo Account deletion should remove the contact from the global contacts as well
1514
1515                 $author = notags(unxmlify($data->author));
1516
1517                 $contact = self::contactByHandle($importer["uid"], $author);
1518                 if (!$contact) {
1519                         logger("cannot find contact for author: ".$author);
1520                         return false;
1521                 }
1522
1523                 // We now remove the contact
1524                 Contact::remove($contact["id"]);
1525                 return true;
1526         }
1527
1528         /**
1529          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1530          *
1531          * @param string  $author    Author handle
1532          * @param string  $guid      Message guid
1533          * @param boolean $onlyfound Only return uri when found in the database
1534          *
1535          * @return string The constructed uri or the one from our database
1536          */
1537         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1538         {
1539                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1540                 if (DBM::is_result($r)) {
1541                         return $r[0]["uri"];
1542                 } elseif (!$onlyfound) {
1543                         return $author.":".$guid;
1544                 }
1545
1546                 return "";
1547         }
1548
1549         /**
1550          * @brief Fetch the guid from our database with a given uri
1551          *
1552          * @param string $uri Message uri
1553          * @param string $uid Author handle
1554          *
1555          * @return string The post guid
1556          */
1557         private static function getGuidFromUri($uri, $uid)
1558         {
1559                 $r = q("SELECT `guid` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($uri), intval($uid));
1560                 if (DBM::is_result($r)) {
1561                         return $r[0]["guid"];
1562                 } else {
1563                         return false;
1564                 }
1565         }
1566
1567         /**
1568          * @brief Find the best importer for a comment, like, ...
1569          *
1570          * @param string $guid The guid of the item
1571          *
1572          * @return array|boolean the origin owner of that post - or false
1573          */
1574         private static function importerForGuid($guid)
1575         {
1576                 $item = dba::fetch_first("SELECT `uid` FROM `item` WHERE `origin` AND `guid` = ? LIMIT 1", $guid);
1577
1578                 if (DBM::is_result($item)) {
1579                         logger("Found user ".$item['uid']." as owner of item ".$guid, LOGGER_DEBUG);
1580                         $contact = dba::fetch_first("SELECT * FROM `contact` WHERE `self` AND `uid` = ?", $item['uid']);
1581                         if (DBM::is_result($contact)) {
1582                                 return $contact;
1583                         }
1584                 }
1585                 return false;
1586         }
1587
1588         /**
1589          * @brief Processes an incoming comment
1590          *
1591          * @param array  $importer Array of the importer user
1592          * @param string $sender   The sender of the message
1593          * @param object $data     The message object
1594          * @param string $xml      The original XML of the message
1595          *
1596          * @return int The message id of the generated comment or "false" if there was an error
1597          */
1598         private static function receiveComment($importer, $sender, $data, $xml)
1599         {
1600                 $author = notags(unxmlify($data->author));
1601                 $guid = notags(unxmlify($data->guid));
1602                 $parent_guid = notags(unxmlify($data->parent_guid));
1603                 $text = unxmlify($data->text);
1604
1605                 if (isset($data->created_at)) {
1606                         $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1607                 } else {
1608                         $created_at = datetime_convert();
1609                 }
1610
1611                 if (isset($data->thread_parent_guid)) {
1612                         $thread_parent_guid = notags(unxmlify($data->thread_parent_guid));
1613                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1614                 } else {
1615                         $thr_uri = "";
1616                 }
1617
1618                 $contact = self::allowedContactByHandle($importer, $sender, true);
1619                 if (!$contact) {
1620                         return false;
1621                 }
1622
1623                 $message_id = self::messageExists($importer["uid"], $guid);
1624                 if ($message_id) {
1625                         return true;
1626                 }
1627
1628                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1629                 if (!$parent_item) {
1630                         return false;
1631                 }
1632
1633                 $person = self::personByHandle($author);
1634                 if (!is_array($person)) {
1635                         logger("unable to find author details");
1636                         return false;
1637                 }
1638
1639                 // Fetch the contact id - if we know this contact
1640                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1641
1642                 $datarray = array();
1643
1644                 $datarray["uid"] = $importer["uid"];
1645                 $datarray["contact-id"] = $author_contact["cid"];
1646                 $datarray["network"]  = $author_contact["network"];
1647
1648                 $datarray["author-name"] = $person["name"];
1649                 $datarray["author-link"] = $person["url"];
1650                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
1651
1652                 $datarray["owner-name"] = $contact["name"];
1653                 $datarray["owner-link"] = $contact["url"];
1654                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
1655
1656                 $datarray["guid"] = $guid;
1657                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1658
1659                 $datarray["type"] = "remote-comment";
1660                 $datarray["verb"] = ACTIVITY_POST;
1661                 $datarray["gravity"] = GRAVITY_COMMENT;
1662
1663                 if ($thr_uri != "") {
1664                         $datarray["parent-uri"] = $thr_uri;
1665                 } else {
1666                         $datarray["parent-uri"] = $parent_item["uri"];
1667                 }
1668
1669                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1670
1671                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1672                 $datarray["source"] = $xml;
1673
1674                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1675
1676                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1677
1678                 $body = diaspora2bb($text);
1679
1680                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1681
1682                 self::fetchGuid($datarray);
1683
1684                 $message_id = item_store($datarray);
1685
1686                 if ($message_id <= 0) {
1687                         return false;
1688                 }
1689
1690                 if ($message_id) {
1691                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1692                 }
1693
1694                 // If we are the origin of the parent we store the original data and notify our followers
1695                 if ($message_id && $parent_item["origin"]) {
1696                         // Formerly we stored the signed text, the signature and the author in different fields.
1697                         // We now store the raw data so that we are more flexible.
1698                         dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($data)));
1699
1700                         // notify others
1701                         Worker::add(PRIORITY_HIGH, "Notifier", "comment-import", $message_id);
1702                 }
1703
1704                 return true;
1705         }
1706
1707         /**
1708          * @brief processes and stores private messages
1709          *
1710          * @param array  $importer     Array of the importer user
1711          * @param array  $contact      The contact of the message
1712          * @param object $data         The message object
1713          * @param array  $msg          Array of the processed message, author handle and key
1714          * @param object $mesg         The private message
1715          * @param array  $conversation The conversation record to which this message belongs
1716          *
1717          * @return bool "true" if it was successful
1718          */
1719         private static function receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation)
1720         {
1721                 $author = notags(unxmlify($data->author));
1722                 $guid = notags(unxmlify($data->guid));
1723                 $subject = notags(unxmlify($data->subject));
1724
1725                 // "diaspora_handle" is the element name from the old version
1726                 // "author" is the element name from the new version
1727                 if ($mesg->author) {
1728                         $msg_author = notags(unxmlify($mesg->author));
1729                 } elseif ($mesg->diaspora_handle) {
1730                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1731                 } else {
1732                         return false;
1733                 }
1734
1735                 $msg_guid = notags(unxmlify($mesg->guid));
1736                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1737                 $msg_text = unxmlify($mesg->text);
1738                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1739
1740                 if ($msg_conversation_guid != $guid) {
1741                         logger("message conversation guid does not belong to the current conversation.");
1742                         return false;
1743                 }
1744
1745                 $body = diaspora2bb($msg_text);
1746                 $message_uri = $msg_author.":".$msg_guid;
1747
1748                 $person = self::personByHandle($msg_author);
1749
1750                 dba::lock('mail');
1751
1752                 $r = q(
1753                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1754                         dbesc($msg_guid),
1755                         intval($importer["uid"])
1756                 );
1757                 if (DBM::is_result($r)) {
1758                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1759                         return false;
1760                 }
1761
1762                 q(
1763                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1764                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1765                         intval($importer["uid"]),
1766                         dbesc($msg_guid),
1767                         intval($conversation["id"]),
1768                         dbesc($person["name"]),
1769                         dbesc($person["photo"]),
1770                         dbesc($person["url"]),
1771                         intval($contact["id"]),
1772                         dbesc($subject),
1773                         dbesc($body),
1774                         0,
1775                         0,
1776                         dbesc($message_uri),
1777                         dbesc($author.":".$guid),
1778                         dbesc($msg_created_at)
1779                 );
1780
1781                 dba::unlock();
1782
1783                 dba::update('conv', array('updated' => datetime_convert()), array('id' => $conversation["id"]));
1784
1785                 notification(
1786                         array(
1787                         "type" => NOTIFY_MAIL,
1788                         "notify_flags" => $importer["notify-flags"],
1789                         "language" => $importer["language"],
1790                         "to_name" => $importer["username"],
1791                         "to_email" => $importer["email"],
1792                         "uid" =>$importer["uid"],
1793                         "item" => array("subject" => $subject, "body" => $body),
1794                         "source_name" => $person["name"],
1795                         "source_link" => $person["url"],
1796                         "source_photo" => $person["thumb"],
1797                         "verb" => ACTIVITY_POST,
1798                         "otype" => "mail")
1799                 );
1800                 return true;
1801         }
1802
1803         /**
1804          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1805          *
1806          * @param array  $importer Array of the importer user
1807          * @param array  $msg      Array of the processed message, author handle and key
1808          * @param object $data     The message object
1809          *
1810          * @return bool Success
1811          */
1812         private static function receiveConversation($importer, $msg, $data)
1813         {
1814                 $author = notags(unxmlify($data->author));
1815                 $guid = notags(unxmlify($data->guid));
1816                 $subject = notags(unxmlify($data->subject));
1817                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1818                 $participants = notags(unxmlify($data->participants));
1819
1820                 $messages = $data->message;
1821
1822                 if (!count($messages)) {
1823                         logger("empty conversation");
1824                         return false;
1825                 }
1826
1827                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1828                 if (!$contact) {
1829                         return false;
1830                 }
1831
1832                 $conversation = null;
1833
1834                 $c = q(
1835                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1836                         intval($importer["uid"]),
1837                         dbesc($guid)
1838                 );
1839                 if ($c)
1840                         $conversation = $c[0];
1841                 else {
1842                         $r = q(
1843                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1844                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1845                                 intval($importer["uid"]),
1846                                 dbesc($guid),
1847                                 dbesc($author),
1848                                 dbesc($created_at),
1849                                 dbesc(datetime_convert()),
1850                                 dbesc($subject),
1851                                 dbesc($participants)
1852                         );
1853                         if ($r) {
1854                                 $c = q(
1855                                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1856                                         intval($importer["uid"]),
1857                                         dbesc($guid)
1858                                 );
1859                         }
1860
1861                         if ($c) {
1862                                 $conversation = $c[0];
1863                         }
1864                 }
1865                 if (!$conversation) {
1866                         logger("unable to create conversation.");
1867                         return false;
1868                 }
1869
1870                 foreach ($messages as $mesg) {
1871                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1872                 }
1873
1874                 return true;
1875         }
1876
1877         /**
1878          * @brief Creates the body for a "like" message
1879          *
1880          * @param array  $contact     The contact that send us the "like"
1881          * @param array  $parent_item The item array of the parent item
1882          * @param string $guid        message guid
1883          *
1884          * @return string the body
1885          */
1886         private static function constructLikeBody($contact, $parent_item, $guid)
1887         {
1888                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1889
1890                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1891                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1892                 $plink = "[url=".System::baseUrl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1893
1894                 return sprintf($bodyverb, $ulink, $alink, $plink);
1895         }
1896
1897         /**
1898          * @brief Creates a XML object for a "like"
1899          *
1900          * @param array $importer    Array of the importer user
1901          * @param array $parent_item The item array of the parent item
1902          *
1903          * @return string The XML
1904          */
1905         private static function constructLikeObject($importer, $parent_item)
1906         {
1907                 $objtype = ACTIVITY_OBJ_NOTE;
1908                 $link = '<link rel="alternate" type="text/html" href="'.System::baseUrl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1909                 $parent_body = $parent_item["body"];
1910
1911                 $xmldata = array("object" => array("type" => $objtype,
1912                                                 "local" => "1",
1913                                                 "id" => $parent_item["uri"],
1914                                                 "link" => $link,
1915                                                 "title" => "",
1916                                                 "content" => $parent_body));
1917
1918                 return XML::fromArray($xmldata, $xml, true);
1919         }
1920
1921         /**
1922          * @brief Processes "like" messages
1923          *
1924          * @param array  $importer Array of the importer user
1925          * @param string $sender   The sender of the message
1926          * @param object $data     The message object
1927          *
1928          * @return int The message id of the generated like or "false" if there was an error
1929          */
1930         private static function receiveLike($importer, $sender, $data)
1931         {
1932                 $author = notags(unxmlify($data->author));
1933                 $guid = notags(unxmlify($data->guid));
1934                 $parent_guid = notags(unxmlify($data->parent_guid));
1935                 $parent_type = notags(unxmlify($data->parent_type));
1936                 $positive = notags(unxmlify($data->positive));
1937
1938                 // likes on comments aren't supported by Diaspora - only on posts
1939                 // But maybe this will be supported in the future, so we will accept it.
1940                 if (!in_array($parent_type, array("Post", "Comment"))) {
1941                         return false;
1942                 }
1943
1944                 $contact = self::allowedContactByHandle($importer, $sender, true);
1945                 if (!$contact) {
1946                         return false;
1947                 }
1948
1949                 $message_id = self::messageExists($importer["uid"], $guid);
1950                 if ($message_id) {
1951                         return true;
1952                 }
1953
1954                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1955                 if (!$parent_item) {
1956                         return false;
1957                 }
1958
1959                 $person = self::personByHandle($author);
1960                 if (!is_array($person)) {
1961                         logger("unable to find author details");
1962                         return false;
1963                 }
1964
1965                 // Fetch the contact id - if we know this contact
1966                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1967
1968                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1969                 // We would accept this anyhow.
1970                 if ($positive == "true") {
1971                         $verb = ACTIVITY_LIKE;
1972                 } else {
1973                         $verb = ACTIVITY_DISLIKE;
1974                 }
1975
1976                 $datarray = array();
1977
1978                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1979
1980                 $datarray["uid"] = $importer["uid"];
1981                 $datarray["contact-id"] = $author_contact["cid"];
1982                 $datarray["network"]  = $author_contact["network"];
1983
1984                 $datarray["author-name"] = $person["name"];
1985                 $datarray["author-link"] = $person["url"];
1986                 $datarray["author-avatar"] = ((x($person, "thumb")) ? $person["thumb"] : $person["photo"]);
1987
1988                 $datarray["owner-name"] = $contact["name"];
1989                 $datarray["owner-link"] = $contact["url"];
1990                 $datarray["owner-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
1991
1992                 $datarray["guid"] = $guid;
1993                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1994
1995                 $datarray["type"] = "activity";
1996                 $datarray["verb"] = $verb;
1997                 $datarray["gravity"] = GRAVITY_LIKE;
1998                 $datarray["parent-uri"] = $parent_item["uri"];
1999
2000                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2001                 $datarray["object"] = self::constructLikeObject($importer, $parent_item);
2002
2003                 $datarray["body"] = self::constructLikeBody($contact, $parent_item, $guid);
2004
2005                 $message_id = item_store($datarray);
2006
2007                 if ($message_id <= 0) {
2008                         return false;
2009                 }
2010
2011                 if ($message_id) {
2012                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2013                 }
2014
2015                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2016                 if ($parent_item["id"] != $parent_item["parent"]) {
2017                         $toplevel = dba::select('item', array('origin'), array('id' => $parent_item["parent"]), array('limit' => 1));
2018                         $origin = $toplevel["origin"];
2019                 } else {
2020                         $origin = $parent_item["origin"];
2021                 }
2022
2023                 // If we are the origin of the parent we store the original data and notify our followers
2024                 if ($message_id && $origin) {
2025                         // Formerly we stored the signed text, the signature and the author in different fields.
2026                         // We now store the raw data so that we are more flexible.
2027                         dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($data)));
2028
2029                         // notify others
2030                         Worker::add(PRIORITY_HIGH, "Notifier", "comment-import", $message_id);
2031                 }
2032
2033                 return true;
2034         }
2035
2036         /**
2037          * @brief Processes private messages
2038          *
2039          * @param array  $importer Array of the importer user
2040          * @param object $data     The message object
2041          *
2042          * @return bool Success?
2043          */
2044         private static function receiveMessage($importer, $data)
2045         {
2046                 $author = notags(unxmlify($data->author));
2047                 $guid = notags(unxmlify($data->guid));
2048                 $conversation_guid = notags(unxmlify($data->conversation_guid));
2049                 $text = unxmlify($data->text);
2050                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2051
2052                 $contact = self::allowedContactByHandle($importer, $author, true);
2053                 if (!$contact) {
2054                         return false;
2055                 }
2056
2057                 $conversation = null;
2058
2059                 $c = q(
2060                         "SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
2061                         intval($importer["uid"]),
2062                         dbesc($conversation_guid)
2063                 );
2064                 if ($c) {
2065                         $conversation = $c[0];
2066                 } else {
2067                         logger("conversation not available.");
2068                         return false;
2069                 }
2070
2071                 $message_uri = $author.":".$guid;
2072
2073                 $person = self::personByHandle($author);
2074                 if (!$person) {
2075                         logger("unable to find author details");
2076                         return false;
2077                 }
2078
2079                 $body = diaspora2bb($text);
2080
2081                 $body = self::replacePeopleGuid($body, $person["url"]);
2082
2083                 dba::lock('mail');
2084
2085                 $r = q(
2086                         "SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
2087                         dbesc($guid),
2088                         intval($importer["uid"])
2089                 );
2090                 if (DBM::is_result($r)) {
2091                         logger("duplicate message already delivered.", LOGGER_DEBUG);
2092                         return false;
2093                 }
2094
2095                 q(
2096                         "INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
2097                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
2098                         intval($importer["uid"]),
2099                         dbesc($guid),
2100                         intval($conversation["id"]),
2101                         dbesc($person["name"]),
2102                         dbesc($person["photo"]),
2103                         dbesc($person["url"]),
2104                         intval($contact["id"]),
2105                         dbesc($conversation["subject"]),
2106                         dbesc($body),
2107                         0,
2108                         1,
2109                         dbesc($message_uri),
2110                         dbesc($author.":".$conversation["guid"]),
2111                         dbesc($created_at)
2112                 );
2113
2114                 dba::unlock();
2115
2116                 dba::update('conv', array('updated' => datetime_convert()), array('id' => $conversation["id"]));
2117                 return true;
2118         }
2119
2120         /**
2121          * @brief Processes participations - unsupported by now
2122          *
2123          * @param array  $importer Array of the importer user
2124          * @param object $data     The message object
2125          *
2126          * @return bool always true
2127          */
2128         private static function receiveParticipation($importer, $data)
2129         {
2130                 // I'm not sure if we can fully support this message type
2131                 return true;
2132         }
2133
2134         /**
2135          * @brief Processes photos - unneeded
2136          *
2137          * @param array  $importer Array of the importer user
2138          * @param object $data     The message object
2139          *
2140          * @return bool always true
2141          */
2142         private static function receivePhoto($importer, $data)
2143         {
2144                 // There doesn't seem to be a reason for this function,
2145                 // since the photo data is transmitted in the status message as well
2146                 return true;
2147         }
2148
2149         /**
2150          * @brief Processes poll participations - unssupported
2151          *
2152          * @param array  $importer Array of the importer user
2153          * @param object $data     The message object
2154          *
2155          * @return bool always true
2156          */
2157         private static function receivePollParticipation($importer, $data)
2158         {
2159                 // We don't support polls by now
2160                 return true;
2161         }
2162
2163         /**
2164          * @brief Processes incoming profile updates
2165          *
2166          * @param array  $importer Array of the importer user
2167          * @param object $data     The message object
2168          *
2169          * @return bool Success
2170          */
2171         private static function receiveProfile($importer, $data)
2172         {
2173                 $author = strtolower(notags(unxmlify($data->author)));
2174
2175                 $contact = self::contactByHandle($importer["uid"], $author);
2176                 if (!$contact) {
2177                         return false;
2178                 }
2179
2180                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
2181                 $image_url = unxmlify($data->image_url);
2182                 $birthday = unxmlify($data->birthday);
2183                 $gender = unxmlify($data->gender);
2184                 $about = diaspora2bb(unxmlify($data->bio));
2185                 $location = diaspora2bb(unxmlify($data->location));
2186                 $searchable = (unxmlify($data->searchable) == "true");
2187                 $nsfw = (unxmlify($data->nsfw) == "true");
2188                 $tags = unxmlify($data->tag_string);
2189
2190                 $tags = explode("#", $tags);
2191
2192                 $keywords = array();
2193                 foreach ($tags as $tag) {
2194                         $tag = trim(strtolower($tag));
2195                         if ($tag != "") {
2196                                 $keywords[] = $tag;
2197                         }
2198                 }
2199
2200                 $keywords = implode(", ", $keywords);
2201
2202                 $handle_parts = explode("@", $author);
2203                 $nick = $handle_parts[0];
2204
2205                 if ($name === "") {
2206                         $name = $handle_parts[0];
2207                 }
2208
2209                 if (preg_match("|^https?://|", $image_url) === 0) {
2210                         $image_url = "http://".$handle_parts[1].$image_url;
2211                 }
2212
2213                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2214
2215                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2216
2217                 $birthday = str_replace("1000", "1901", $birthday);
2218
2219                 if ($birthday != "") {
2220                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
2221                 }
2222
2223                 // this is to prevent multiple birthday notifications in a single year
2224                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2225
2226                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2227                         $birthday = $contact["bd"];
2228                 }
2229
2230                 $r = q(
2231                         "UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
2232                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
2233                         dbesc($name),
2234                         dbesc($nick),
2235                         dbesc($author),
2236                         dbesc(datetime_convert()),
2237                         dbesc($birthday),
2238                         dbesc($location),
2239                         dbesc($about),
2240                         dbesc($keywords),
2241                         dbesc($gender),
2242                         intval($contact["id"]),
2243                         intval($importer["uid"])
2244                 );
2245
2246                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
2247                                         "photo" => $image_url, "name" => $name, "location" => $location,
2248                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2249                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2250                                         "hide" => !$searchable, "nsfw" => $nsfw);
2251
2252                 $gcid = GlobalContact::update($gcontact);
2253
2254                 GlobalContact::link($gcid, $importer["uid"], $contact["id"]);
2255
2256                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
2257
2258                 return true;
2259         }
2260
2261         /**
2262          * @brief Processes incoming friend requests
2263          *
2264          * @param array $importer Array of the importer user
2265          * @param array $contact  The contact that send the request
2266          * @return void
2267          */
2268         private static function receiveRequestMakeFriend($importer, $contact)
2269         {
2270                 $a = get_app();
2271
2272                 if ($contact["rel"] == CONTACT_IS_SHARING) {
2273                         dba::update(
2274                                 'contact',
2275                                 array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
2276                                 array('id' => $contact["id"], 'uid' => $importer["uid"])
2277                         );
2278                 }
2279                 // send notification
2280
2281                 $r = q(
2282                         "SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
2283                         intval($importer["uid"])
2284                 );
2285
2286                 if ($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(PConfig::get($importer["uid"], "system", "post_newfriend"))) {
2287                         $self = q(
2288                                 "SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
2289                                 intval($importer["uid"])
2290                         );
2291
2292                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
2293
2294                         if ($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
2295                                 $arr = array();
2296                                 $arr["protocol"] = PROTOCOL_DIASPORA;
2297                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
2298                                 $arr["uid"] = $importer["uid"];
2299                                 $arr["contact-id"] = $self[0]["id"];
2300                                 $arr["wall"] = 1;
2301                                 $arr["type"] = 'wall';
2302                                 $arr["gravity"] = 0;
2303                                 $arr["origin"] = 1;
2304                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
2305                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
2306                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
2307                                 $arr["verb"] = ACTIVITY_FRIEND;
2308                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
2309
2310                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
2311                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
2312                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
2313                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
2314
2315                                 $arr["object"] = self::constructNewFriendObject($contact);
2316
2317                                 $arr["last-child"] = 1;
2318
2319                                 $arr["allow_cid"] = $user[0]["allow_cid"];
2320                                 $arr["allow_gid"] = $user[0]["allow_gid"];
2321                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
2322                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
2323
2324                                 $i = item_store($arr);
2325                                 if ($i) {
2326                                         Worker::add(PRIORITY_HIGH, "Notifier", "activity", $i);
2327                                 }
2328                         }
2329                 }
2330         }
2331
2332         /**
2333          * @brief Creates a XML object for a "new friend" message
2334          *
2335          * @param array $contact Array of the contact
2336          *
2337          * @return string The XML
2338          */
2339         private static function constructNewFriendObject($contact)
2340         {
2341                 $objtype = ACTIVITY_OBJ_PERSON;
2342                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
2343                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
2344
2345                 $xmldata = array("object" => array("type" => $objtype,
2346                                                 "title" => $contact["name"],
2347                                                 "id" => $contact["url"]."/".$contact["name"],
2348                                                 "link" => $link));
2349
2350                 return XML::fromArray($xmldata, $xml, true);
2351         }
2352
2353         /**
2354          * @brief Processes incoming sharing notification
2355          *
2356          * @param array  $importer Array of the importer user
2357          * @param object $data     The message object
2358          *
2359          * @return bool Success
2360          */
2361         private static function receiveContactRequest($importer, $data)
2362         {
2363                 $author = unxmlify($data->author);
2364                 $recipient = unxmlify($data->recipient);
2365
2366                 if (!$author || !$recipient) {
2367                         return false;
2368                 }
2369
2370                 // the current protocol version doesn't know these fields
2371                 // That means that we will assume their existance
2372                 if (isset($data->following)) {
2373                         $following = (unxmlify($data->following) == "true");
2374                 } else {
2375                         $following = true;
2376                 }
2377
2378                 if (isset($data->sharing)) {
2379                         $sharing = (unxmlify($data->sharing) == "true");
2380                 } else {
2381                         $sharing = true;
2382                 }
2383
2384                 $contact = self::contactByHandle($importer["uid"], $author);
2385
2386                 // perhaps we were already sharing with this person. Now they're sharing with us.
2387                 // That makes us friends.
2388                 if ($contact) {
2389                         if ($following) {
2390                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", LOGGER_DEBUG);
2391                                 self::receiveRequestMakeFriend($importer, $contact);
2392
2393                                 // refetch the contact array
2394                                 $contact = self::contactByHandle($importer["uid"], $author);
2395
2396                                 // If we are now friends, we are sending a share message.
2397                                 // Normally we needn't to do so, but the first message could have been vanished.
2398                                 if (in_array($contact["rel"], array(CONTACT_IS_FRIEND))) {
2399                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2400                                         if ($u) {
2401                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2402                                                 $ret = self::sendShare($u[0], $contact);
2403                                         }
2404                                 }
2405                                 return true;
2406                         } else {
2407                                 logger("Author ".$author." doesn't want to follow us anymore.", LOGGER_DEBUG);
2408                                 lose_follower($importer, $contact);
2409                                 return true;
2410                         }
2411                 }
2412
2413                 if (!$following && $sharing && in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
2414                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2415                         return false;
2416                 } elseif (!$following && !$sharing) {
2417                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2418                         return false;
2419                 } elseif (!$following && $sharing) {
2420                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2421                 } elseif ($following && $sharing) {
2422                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2423                 } elseif ($following && !$sharing) {
2424                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2425                 }
2426
2427                 $ret = self::personByHandle($author);
2428
2429                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2430                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2431                         return false;
2432                 }
2433
2434                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2435
2436                 $r = q(
2437                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2438                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2439                         intval($importer["uid"]),
2440                         dbesc($ret["network"]),
2441                         dbesc($ret["addr"]),
2442                         datetime_convert(),
2443                         dbesc($ret["url"]),
2444                         dbesc(normalise_link($ret["url"])),
2445                         dbesc($batch),
2446                         dbesc($ret["name"]),
2447                         dbesc($ret["nick"]),
2448                         dbesc($ret["photo"]),
2449                         dbesc($ret["pubkey"]),
2450                         dbesc($ret["notify"]),
2451                         dbesc($ret["poll"]),
2452                         1,
2453                         2
2454                 );
2455
2456                 // find the contact record we just created
2457
2458                 $contact_record = self::contactByHandle($importer["uid"], $author);
2459
2460                 if (!$contact_record) {
2461                         logger("unable to locate newly created contact record.");
2462                         return;
2463                 }
2464
2465                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2466
2467                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
2468
2469                 if (intval($def_gid)) {
2470                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
2471                 }
2472
2473                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2474
2475                 if ($importer["page-flags"] == PAGE_NORMAL) {
2476                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2477
2478                         $hash = random_string().(string)time();   // Generate a confirm_key
2479
2480                         $ret = q(
2481                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2482                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2483                                 intval($importer["uid"]),
2484                                 intval($contact_record["id"]),
2485                                 0,
2486                                 0,
2487                                 dbesc(t("Sharing notification from Diaspora network")),
2488                                 dbesc($hash),
2489                                 dbesc(datetime_convert())
2490                         );
2491                 } else {
2492                         // automatic friend approval
2493
2494                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2495
2496                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2497
2498                         // technically they are sharing with us (CONTACT_IS_SHARING),
2499                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2500                         // we are going to change the relationship and make them a follower.
2501
2502                         if (($importer["page-flags"] == PAGE_FREELOVE) && $sharing && $following) {
2503                                 $new_relation = CONTACT_IS_FRIEND;
2504                         } elseif (($importer["page-flags"] == PAGE_FREELOVE) && $sharing) {
2505                                 $new_relation = CONTACT_IS_SHARING;
2506                         } else {
2507                                 $new_relation = CONTACT_IS_FOLLOWER;
2508                         }
2509
2510                         $r = q(
2511                                 "UPDATE `contact` SET `rel` = %d,
2512                                 `name-date` = '%s',
2513                                 `uri-date` = '%s',
2514                                 `blocked` = 0,
2515                                 `pending` = 0,
2516                                 `writable` = 1
2517                                 WHERE `id` = %d
2518                                 ",
2519                                 intval($new_relation),
2520                                 dbesc(datetime_convert()),
2521                                 dbesc(datetime_convert()),
2522                                 intval($contact_record["id"])
2523                         );
2524
2525                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2526                         if ($u) {
2527                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2528                                 $ret = self::sendShare($u[0], $contact_record);
2529
2530                                 // Send the profile data, maybe it weren't transmitted before
2531                                 self::sendProfile($importer["uid"], array($contact_record));
2532                         }
2533                 }
2534
2535                 return true;
2536         }
2537
2538         /**
2539          * @brief Fetches a message with a given guid
2540          *
2541          * @param string $guid        message guid
2542          * @param string $orig_author handle of the original post
2543          * @param string $author      handle of the sharer
2544          *
2545          * @return array The fetched item
2546          */
2547         private static function originalItem($guid, $orig_author, $author)
2548         {
2549                 // Do we already have this item?
2550                 $r = q(
2551                         "SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2552                                 `author-name`, `author-link`, `author-avatar`
2553                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2554                         dbesc($guid)
2555                 );
2556
2557                 if (DBM::is_result($r)) {
2558                         logger("reshared message ".$guid." already exists on system.");
2559
2560                         // Maybe it is already a reshared item?
2561                         // Then refetch the content, if it is a reshare from a reshare.
2562                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2563                         if (self::isReshare($r[0]["body"], true)) {
2564                                 $r = array();
2565                         } elseif (self::isReshare($r[0]["body"], false) || strstr($r[0]["body"], "[share")) {
2566                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2567
2568                                 $r[0]["body"] = self::replacePeopleGuid($r[0]["body"], $r[0]["author-link"]);
2569
2570                                 // Add OEmbed and other information to the body
2571                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
2572
2573                                 return $r[0];
2574                         } else {
2575                                 return $r[0];
2576                         }
2577                 }
2578
2579                 if (!DBM::is_result($r)) {
2580                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2581                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2582                         $item_id = self::storeByGuid($guid, $server);
2583
2584                         if (!$item_id) {
2585                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2586                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
2587                                 $item_id = self::storeByGuid($guid, $server);
2588                         }
2589
2590                         if ($item_id) {
2591                                 $r = q(
2592                                         "SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2593                                                 `author-name`, `author-link`, `author-avatar`
2594                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2595                                         intval($item_id)
2596                                 );
2597
2598                                 if (DBM::is_result($r)) {
2599                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2600                                         if (self::isReshare($r[0]["body"], false)) {
2601                                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2602                                                 $r[0]["body"] = self::replacePeopleGuid($r[0]["body"], $r[0]["author-link"]);
2603                                         }
2604
2605                                         return $r[0];
2606                                 }
2607                         }
2608                 }
2609                 return false;
2610         }
2611
2612         /**
2613          * @brief Processes a reshare message
2614          *
2615          * @param array  $importer Array of the importer user
2616          * @param object $data     The message object
2617          * @param string $xml      The original XML of the message
2618          *
2619          * @return int the message id
2620          */
2621         private static function receiveReshare($importer, $data, $xml)
2622         {
2623                 $author = notags(unxmlify($data->author));
2624                 $guid = notags(unxmlify($data->guid));
2625                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2626                 $root_author = notags(unxmlify($data->root_author));
2627                 $root_guid = notags(unxmlify($data->root_guid));
2628                 /// @todo handle unprocessed property "provider_display_name"
2629                 $public = notags(unxmlify($data->public));
2630
2631                 $contact = self::allowedContactByHandle($importer, $author, false);
2632                 if (!$contact) {
2633                         return false;
2634                 }
2635
2636                 $message_id = self::messageExists($importer["uid"], $guid);
2637                 if ($message_id) {
2638                         return true;
2639                 }
2640
2641                 $original_item = self::originalItem($root_guid, $root_author, $author);
2642                 if (!$original_item) {
2643                         return false;
2644                 }
2645
2646                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2647
2648                 $datarray = array();
2649
2650                 $datarray["uid"] = $importer["uid"];
2651                 $datarray["contact-id"] = $contact["id"];
2652                 $datarray["network"]  = NETWORK_DIASPORA;
2653
2654                 $datarray["author-name"] = $contact["name"];
2655                 $datarray["author-link"] = $contact["url"];
2656                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2657
2658                 $datarray["owner-name"] = $datarray["author-name"];
2659                 $datarray["owner-link"] = $datarray["author-link"];
2660                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2661
2662                 $datarray["guid"] = $guid;
2663                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2664
2665                 $datarray["verb"] = ACTIVITY_POST;
2666                 $datarray["gravity"] = GRAVITY_PARENT;
2667
2668                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2669                 $datarray["source"] = $xml;
2670
2671                 $prefix = share_header(
2672                         $original_item["author-name"],
2673                         $original_item["author-link"],
2674                         $original_item["author-avatar"],
2675                         $original_item["guid"],
2676                         $original_item["created"],
2677                         $orig_url
2678                 );
2679                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2680
2681                 $datarray["tag"] = $original_item["tag"];
2682                 $datarray["app"]  = $original_item["app"];
2683
2684                 $datarray["plink"] = self::plink($author, $guid);
2685                 $datarray["private"] = (($public == "false") ? 1 : 0);
2686                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2687
2688                 $datarray["object-type"] = $original_item["object-type"];
2689
2690                 self::fetchGuid($datarray);
2691                 $message_id = item_store($datarray);
2692
2693                 if ($message_id) {
2694                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2695                         return true;
2696                 } else {
2697                         return false;
2698                 }
2699         }
2700
2701         /**
2702          * @brief Processes retractions
2703          *
2704          * @param array  $importer Array of the importer user
2705          * @param array  $contact  The contact of the item owner
2706          * @param object $data     The message object
2707          *
2708          * @return bool success
2709          */
2710         private static function itemRetraction($importer, $contact, $data)
2711         {
2712                 $author = notags(unxmlify($data->author));
2713                 $target_guid = notags(unxmlify($data->target_guid));
2714                 $target_type = notags(unxmlify($data->target_type));
2715
2716                 $person = self::personByHandle($author);
2717                 if (!is_array($person)) {
2718                         logger("unable to find author detail for ".$author);
2719                         return false;
2720                 }
2721
2722                 if (empty($contact["url"])) {
2723                         $contact["url"] = $person["url"];
2724                 }
2725
2726                 // Fetch items that are about to be deleted
2727                 $fields = array('uid', 'id', 'parent', 'parent-uri', 'author-link');
2728
2729                 // When we receive a public retraction, we delete every item that we find.
2730                 if ($importer['uid'] == 0) {
2731                         $condition = array("`guid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid);
2732                 } else {
2733                         $condition = array("`guid` = ? AND `uid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid, $importer['uid']);
2734                 }
2735                 $r = dba::select('item', $fields, $condition);
2736                 if (!DBM::is_result($r)) {
2737                         logger("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2738                         return false;
2739                 }
2740
2741                 while ($item = dba::fetch($r)) {
2742                         // Fetch the parent item
2743                         $parent = dba::select('item', array('author-link', 'origin'), array('id' => $item["parent"]), array('limit' => 1));
2744
2745                         // Only delete it if the parent author really fits
2746                         if (!link_compare($parent["author-link"], $contact["url"]) && !link_compare($item["author-link"], $contact["url"])) {
2747                                 logger("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2748                                 continue;
2749                         }
2750
2751                         // Currently we don't have a central deletion function that we could use in this case.
2752                         // The function "item_drop" doesn't work for that case
2753                         dba::update(
2754                                 'item',
2755                                 array(
2756                                         'deleted' => true,
2757                                         'title' => '',
2758                                         'body' => '',
2759                                         'edited' => datetime_convert(),
2760                                         'changed' => datetime_convert()),
2761                                 array('id' => $item["id"])
2762                         );
2763
2764                         // Delete the thread - if it is a starting post and not a comment
2765                         if ($target_type != 'Comment') {
2766                                 delete_thread($item["id"], $item["parent-uri"]);
2767                         }
2768
2769                         logger("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], LOGGER_DEBUG);
2770
2771                         // Now check if the retraction needs to be relayed by us
2772                         if ($parent["origin"]) {
2773                                 // notify others
2774                                 Worker::add(PRIORITY_HIGH, "Notifier", "drop", $item["id"]);
2775                         }
2776                 }
2777
2778                 return true;
2779         }
2780
2781         /**
2782          * @brief Receives retraction messages
2783          *
2784          * @param array  $importer Array of the importer user
2785          * @param string $sender   The sender of the message
2786          * @param object $data     The message object
2787          *
2788          * @return bool Success
2789          */
2790         private static function receiveRetraction($importer, $sender, $data)
2791         {
2792                 $target_type = notags(unxmlify($data->target_type));
2793
2794                 $contact = self::contactByHandle($importer["uid"], $sender);
2795                 if (!$contact && (in_array($target_type, array("Contact", "Person")))) {
2796                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2797                         return false;
2798                 }
2799
2800                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2801
2802                 switch ($target_type) {
2803                         case "Comment":
2804                         case "Like":
2805                         case "Post":
2806                         case "Reshare":
2807                         case "StatusMessage":
2808                                 return self::itemRetraction($importer, $contact, $data);
2809
2810                         case "Contact":
2811                         case "Person":
2812                                 /// @todo What should we do with an "unshare"?
2813                                 // Removing the contact isn't correct since we still can read the public items
2814                                 Contact::remove($contact["id"]);
2815                                 return true;
2816
2817                         default:
2818                                 logger("Unknown target type ".$target_type);
2819                                 return false;
2820                 }
2821                 return true;
2822         }
2823
2824         /**
2825          * @brief Receives status messages
2826          *
2827          * @param array  $importer Array of the importer user
2828          * @param object $data     The message object
2829          * @param string $xml      The original XML of the message
2830          *
2831          * @return int The message id of the newly created item
2832          */
2833         private static function receiveStatusMessage($importer, $data, $xml)
2834         {
2835                 $author = notags(unxmlify($data->author));
2836                 $guid = notags(unxmlify($data->guid));
2837                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2838                 $public = notags(unxmlify($data->public));
2839                 $text = unxmlify($data->text);
2840                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2841
2842                 $contact = self::allowedContactByHandle($importer, $author, false);
2843                 if (!$contact) {
2844                         return false;
2845                 }
2846
2847                 $message_id = self::messageExists($importer["uid"], $guid);
2848                 if ($message_id) {
2849                         return true;
2850                 }
2851
2852                 $address = array();
2853                 if ($data->location) {
2854                         foreach ($data->location->children() as $fieldname => $data) {
2855                                 $address[$fieldname] = notags(unxmlify($data));
2856                         }
2857                 }
2858
2859                 $body = diaspora2bb($text);
2860
2861                 $datarray = array();
2862
2863                 // Attach embedded pictures to the body
2864                 if ($data->photo) {
2865                         foreach ($data->photo as $photo) {
2866                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2867                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2868                         }
2869
2870                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2871                 } else {
2872                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2873
2874                         // Add OEmbed and other information to the body
2875                         if (!self::isRedmatrix($contact["url"])) {
2876                                 $body = add_page_info_to_body($body, false, true);
2877                         }
2878                 }
2879
2880                 /// @todo enable support for polls
2881                 //if ($data->poll) {
2882                 //      foreach ($data->poll AS $poll)
2883                 //              print_r($poll);
2884                 //      die("poll!\n");
2885                 //}
2886
2887                 /// @todo enable support for events
2888
2889                 $datarray["uid"] = $importer["uid"];
2890                 $datarray["contact-id"] = $contact["id"];
2891                 $datarray["network"] = NETWORK_DIASPORA;
2892
2893                 $datarray["author-name"] = $contact["name"];
2894                 $datarray["author-link"] = $contact["url"];
2895                 $datarray["author-avatar"] = ((x($contact, "thumb")) ? $contact["thumb"] : $contact["photo"]);
2896
2897                 $datarray["owner-name"] = $datarray["author-name"];
2898                 $datarray["owner-link"] = $datarray["author-link"];
2899                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2900
2901                 $datarray["guid"] = $guid;
2902                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2903
2904                 $datarray["verb"] = ACTIVITY_POST;
2905                 $datarray["gravity"] = GRAVITY_PARENT;
2906
2907                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2908                 $datarray["source"] = $xml;
2909
2910                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2911
2912                 if ($provider_display_name != "") {
2913                         $datarray["app"] = $provider_display_name;
2914                 }
2915
2916                 $datarray["plink"] = self::plink($author, $guid);
2917                 $datarray["private"] = (($public == "false") ? 1 : 0);
2918                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2919
2920                 if (isset($address["address"])) {
2921                         $datarray["location"] = $address["address"];
2922                 }
2923
2924                 if (isset($address["lat"]) && isset($address["lng"])) {
2925                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2926                 }
2927
2928                 self::fetchGuid($datarray);
2929                 $message_id = item_store($datarray);
2930
2931                 if ($message_id) {
2932                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2933                         return true;
2934                 } else {
2935                         return false;
2936                 }
2937         }
2938
2939         /* ************************************************************************************** *
2940          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2941          * ************************************************************************************** */
2942
2943         /**
2944          * @brief returnes the handle of a contact
2945          *
2946          * @param array $contact contact array
2947          *
2948          * @return string the handle in the format user@domain.tld
2949          */
2950         private static function myHandle($contact)
2951         {
2952                 if ($contact["addr"] != "") {
2953                         return $contact["addr"];
2954                 }
2955
2956                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2957                 // So - just in case - we build the the address here.
2958                 if ($contact["nickname"] != "") {
2959                         $nick = $contact["nickname"];
2960                 } else {
2961                         $nick = $contact["nick"];
2962                 }
2963
2964                 return $nick."@".substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
2965         }
2966
2967
2968         /**
2969          * @brief Creates the data for a private message in the new format
2970          *
2971          * @param string $msg     The message that is to be transmitted
2972          * @param array  $user    The record of the sender
2973          * @param array  $contact Target of the communication
2974          * @param string $prvkey  The private key of the sender
2975          * @param string $pubkey  The public key of the receiver
2976          *
2977          * @return string The encrypted data
2978          */
2979         public static function encodePrivateData($msg, $user, $contact, $prvkey, $pubkey)
2980         {
2981                 logger("Message: ".$msg, LOGGER_DATA);
2982
2983                 // without a public key nothing will work
2984                 if (!$pubkey) {
2985                         logger("pubkey missing: contact id: ".$contact["id"]);
2986                         return false;
2987                 }
2988
2989                 $aes_key = openssl_random_pseudo_bytes(32);
2990                 $b_aes_key = base64_encode($aes_key);
2991                 $iv = openssl_random_pseudo_bytes(16);
2992                 $b_iv = base64_encode($iv);
2993
2994                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
2995
2996                 $json = json_encode(array("iv" => $b_iv, "key" => $b_aes_key));
2997
2998                 $encrypted_key_bundle = "";
2999                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3000
3001                 $json_object = json_encode(
3002                         array("aes_key" => base64_encode($encrypted_key_bundle),
3003                                         "encrypted_magic_envelope" => base64_encode($ciphertext))
3004                 );
3005
3006                 return $json_object;
3007         }
3008
3009         /**
3010          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3011          *
3012          * @param string $msg  The message that is to be transmitted
3013          * @param array  $user The record of the sender
3014          *
3015          * @return string The envelope
3016          */
3017         public static function buildMagicEnvelope($msg, $user)
3018         {
3019                 $b64url_data = base64url_encode($msg);
3020                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
3021
3022                 $key_id = base64url_encode(self::myHandle($user));
3023                 $type = "application/xml";
3024                 $encoding = "base64url";
3025                 $alg = "RSA-SHA256";
3026                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
3027
3028                 // Fallback if the private key wasn't transmitted in the expected field
3029                 if ($user['uprvkey'] == "") {
3030                         $user['uprvkey'] = $user['prvkey'];
3031                 }
3032
3033                 $signature = rsa_sign($signable_data, $user["uprvkey"]);
3034                 $sig = base64url_encode($signature);
3035
3036                 $xmldata = array("me:env" => array("me:data" => $data,
3037                                                         "@attributes" => array("type" => $type),
3038                                                         "me:encoding" => $encoding,
3039                                                         "me:alg" => $alg,
3040                                                         "me:sig" => $sig,
3041                                                         "@attributes2" => array("key_id" => $key_id)));
3042
3043                 $namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
3044
3045                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3046         }
3047
3048         /**
3049          * @brief Create the envelope for a message
3050          *
3051          * @param string $msg     The message that is to be transmitted
3052          * @param array  $user    The record of the sender
3053          * @param array  $contact Target of the communication
3054          * @param string $prvkey  The private key of the sender
3055          * @param string $pubkey  The public key of the receiver
3056          * @param bool   $public  Is the message public?
3057          *
3058          * @return string The message that will be transmitted to other servers
3059          */
3060         private static function buildMessage($msg, $user, $contact, $prvkey, $pubkey, $public = false)
3061         {
3062                 // The message is put into an envelope with the sender's signature
3063                 $envelope = self::buildMagicEnvelope($msg, $user);
3064
3065                 // Private messages are put into a second envelope, encrypted with the receivers public key
3066                 if (!$public) {
3067                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3068                 }
3069
3070                 return $envelope;
3071         }
3072
3073         /**
3074          * @brief Creates a signature for a message
3075          *
3076          * @param array $owner   the array of the owner of the message
3077          * @param array $message The message that is to be signed
3078          *
3079          * @return string The signature
3080          */
3081         private static function signature($owner, $message)
3082         {
3083                 $sigmsg = $message;
3084                 unset($sigmsg["author_signature"]);
3085                 unset($sigmsg["parent_author_signature"]);
3086
3087                 $signed_text = implode(";", $sigmsg);
3088
3089                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
3090         }
3091
3092         /**
3093          * @brief Transmit a message to a target server
3094          *
3095          * @param array  $owner        the array of the item owner
3096          * @param array  $contact      Target of the communication
3097          * @param string $envelope     The message that is to be transmitted
3098          * @param bool   $public_batch Is it a public post?
3099          * @param bool   $queue_run    Is the transmission called from the queue?
3100          * @param string $guid         message guid
3101          *
3102          * @return int Result of the transmission
3103          */
3104         public static function transmit($owner, $contact, $envelope, $public_batch, $queue_run = false, $guid = "")
3105         {
3106                 $a = get_app();
3107
3108                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3109                 if (!$enabled) {
3110                         return 200;
3111                 }
3112
3113                 $logid = random_string(4);
3114                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
3115                 if (!$dest_url) {
3116                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3117                         return 0;
3118                 }
3119
3120                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
3121
3122                 if (!$queue_run && was_recently_delayed($contact["id"])) {
3123                         $return_code = 0;
3124                 } else {
3125                         if (!intval(Config::get("system", "diaspora_test"))) {
3126                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3127
3128                                 post_url($dest_url."/", $envelope, array("Content-Type: ".$content_type));
3129                                 $return_code = $a->get_curl_code();
3130                         } else {
3131                                 logger("test_mode");
3132                                 return 200;
3133                         }
3134                 }
3135
3136                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
3137
3138                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
3139                         logger("queue message");
3140
3141                         $r = q(
3142                                 "SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
3143                                 intval($contact["id"]),
3144                                 dbesc(NETWORK_DIASPORA),
3145                                 dbesc($envelope),
3146                                 intval($public_batch)
3147                         );
3148                         if ($r) {
3149                                 logger("add_to_queue ignored - identical item already in queue");
3150                         } else {
3151                                 // queue message for redelivery
3152                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch);
3153
3154                                 // The message could not be delivered. We mark the contact as "dead"
3155                                 Contact::markForArchival($contact);
3156                         }
3157                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
3158                         // We successfully delivered a message, the contact is alive
3159                         Contact::unmarkForArchival($contact);
3160                 }
3161
3162                 return(($return_code) ? $return_code : (-1));
3163         }
3164
3165
3166         /**
3167          * @brief Build the post xml
3168          *
3169          * @param string $type    The message type
3170          * @param array  $message The message data
3171          *
3172          * @return string The post XML
3173          */
3174         public static function buildPostXml($type, $message)
3175         {
3176                 $data = array($type => $message);
3177
3178                 return XML::fromArray($data, $xml);
3179         }
3180
3181         /**
3182          * @brief Builds and transmit messages
3183          *
3184          * @param array  $owner        the array of the item owner
3185          * @param array  $contact      Target of the communication
3186          * @param string $type         The message type
3187          * @param array  $message      The message data
3188          * @param bool   $public_batch Is it a public post?
3189          * @param string $guid         message guid
3190          * @param bool   $spool        Should the transmission be spooled or transmitted?
3191          *
3192          * @return int Result of the transmission
3193          */
3194         private static function buildAndTransmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false)
3195         {
3196                 $msg = self::buildPostXml($type, $message);
3197
3198                 logger('message: '.$msg, LOGGER_DATA);
3199                 logger('send guid '.$guid, LOGGER_DEBUG);
3200
3201                 // Fallback if the private key wasn't transmitted in the expected field
3202                 if ($owner['uprvkey'] == "") {
3203                         $owner['uprvkey'] = $owner['prvkey'];
3204                 }
3205
3206                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3207
3208                 if ($spool) {
3209                         add_to_queue($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch);
3210                         return true;
3211                 } else {
3212                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3213                 }
3214
3215                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
3216
3217                 return $return_code;
3218         }
3219
3220         /**
3221          * @brief sends an account migration
3222          *
3223          * @param array $owner   the array of the item owner
3224          * @param array $contact Target of the communication
3225          * @param int   $uid     User ID
3226          *
3227          * @return int The result of the transmission
3228          */
3229         public static function sendAccountMigration($owner, $contact, $uid)
3230         {
3231                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3232                 $profile = self::createProfileData($uid);
3233
3234                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3235                 $signature = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
3236
3237                 $message = array("author" => $old_handle,
3238                                 "profile" => $profile,
3239                                 "signature" => $signature);
3240
3241                 logger("Send account migration ".print_r($message, true), LOGGER_DEBUG);
3242
3243                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3244         }
3245
3246         /**
3247          * @brief Sends a "share" message
3248          *
3249          * @param array $owner   the array of the item owner
3250          * @param array $contact Target of the communication
3251          *
3252          * @return int The result of the transmission
3253          */
3254         public static function sendShare($owner, $contact)
3255         {
3256                 /**
3257                  * @todo support the different possible combinations of "following" and "sharing"
3258                  * Currently, Diaspora only interprets the "sharing" field
3259                  *
3260                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3261                  */
3262
3263                 /*
3264                 switch ($contact["rel"]) {
3265                         case CONTACT_IS_FRIEND:
3266                                 $following = true;
3267                                 $sharing = true;
3268                         case CONTACT_IS_SHARING:
3269                                 $following = false;
3270                                 $sharing = true;
3271                         case CONTACT_IS_FOLLOWER:
3272                                 $following = true;
3273                                 $sharing = false;
3274                 }
3275                 */
3276
3277                 $message = array("author" => self::myHandle($owner),
3278                                 "recipient" => $contact["addr"],
3279                                 "following" => "true",
3280                                 "sharing" => "true");
3281
3282                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
3283
3284                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3285         }
3286
3287         /**
3288          * @brief sends an "unshare"
3289          *
3290          * @param array $owner   the array of the item owner
3291          * @param array $contact Target of the communication
3292          *
3293          * @return int The result of the transmission
3294          */
3295         public static function sendUnshare($owner, $contact)
3296         {
3297                 $message = array("author" => self::myHandle($owner),
3298                                 "recipient" => $contact["addr"],
3299                                 "following" => "false",
3300                                 "sharing" => "false");
3301
3302                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
3303
3304                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3305         }
3306
3307         /**
3308          * @brief Checks a message body if it is a reshare
3309          *
3310          * @param string $body     The message body that is to be check
3311          * @param bool   $complete Should it be a complete check or a simple check?
3312          *
3313          * @return array|bool Reshare details or "false" if no reshare
3314          */
3315         public static function isReshare($body, $complete = true)
3316         {
3317                 $body = trim($body);
3318
3319                 // Skip if it isn't a pure repeated messages
3320                 // Does it start with a share?
3321                 if ((strpos($body, "[share") > 0) && $complete) {
3322                         return(false);
3323                 }
3324
3325                 // Does it end with a share?
3326                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3327                         return(false);
3328                 }
3329
3330                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3331                 // Skip if there is no shared message in there
3332                 if ($body == $attributes) {
3333                         return(false);
3334                 }
3335
3336                 // If we don't do the complete check we quit here
3337                 if (!$complete) {
3338                         return true;
3339                 }
3340
3341                 $guid = "";
3342                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3343                 if ($matches[1] != "") {
3344                         $guid = $matches[1];
3345                 }
3346
3347                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3348                 if ($matches[1] != "") {
3349                         $guid = $matches[1];
3350                 }
3351
3352                 if ($guid != "") {
3353                         $r = q(
3354                                 "SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
3355                                 dbesc($guid),
3356                                 NETWORK_DFRN,
3357                                 NETWORK_DIASPORA
3358                         );
3359                         if ($r) {
3360                                 $ret= array();
3361                                 $ret["root_handle"] = self::handleFromContact($r[0]["contact-id"]);
3362                                 $ret["root_guid"] = $guid;
3363                                 return($ret);
3364                         }
3365                 }
3366
3367                 $profile = "";
3368                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3369                 if ($matches[1] != "") {
3370                         $profile = $matches[1];
3371                 }
3372
3373                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3374                 if ($matches[1] != "") {
3375                         $profile = $matches[1];
3376                 }
3377
3378                 $ret= array();
3379
3380                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
3381                 if (($ret["root_handle"] == $profile) || ($ret["root_handle"] == "")) {
3382                         return(false);
3383                 }
3384
3385                 $link = "";
3386                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
3387                 if ($matches[1] != "") {
3388                         $link = $matches[1];
3389                 }
3390
3391                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
3392                 if ($matches[1] != "") {
3393                         $link = $matches[1];
3394                 }
3395
3396                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
3397                 if (($ret["root_guid"] == $link) || (trim($ret["root_guid"]) == "")) {
3398                         return(false);
3399                 }
3400
3401                 return($ret);
3402         }
3403
3404         /**
3405          * @brief Create an event array
3406          *
3407          * @param integer $event_id The id of the event
3408          *
3409          * @return array with event data
3410          */
3411         private static function buildEvent($event_id)
3412         {
3413                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3414                 if (!DBM::is_result($r)) {
3415                         return array();
3416                 }
3417
3418                 $event = $r[0];
3419
3420                 $eventdata = array();
3421
3422                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3423                 if (!DBM::is_result($r)) {
3424                         return array();
3425                 }
3426
3427                 $user = $r[0];
3428
3429                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3430                 if (!DBM::is_result($r)) {
3431                         return array();
3432                 }
3433
3434                 $owner = $r[0];
3435
3436                 $eventdata['author'] = self::myHandle($owner);
3437
3438                 if ($event['guid']) {
3439                         $eventdata['guid'] = $event['guid'];
3440                 }
3441
3442                 $mask = 'Y-m-d\TH:i:s\Z';
3443
3444                 /// @todo - establish "all day" events in Friendica
3445                 $eventdata["all_day"] = "false";
3446
3447                 if (!$event['adjust']) {
3448                         $eventdata['timezone'] = $user['timezone'];
3449
3450                         if ($eventdata['timezone'] == "") {
3451                                 $eventdata['timezone'] = 'UTC';
3452                         }
3453                 }
3454
3455                 if ($event['start']) {
3456                         $eventdata['start'] = datetime_convert($eventdata['timezone'], "UTC", $event['start'], $mask);
3457                 }
3458                 if ($event['finish'] && !$event['nofinish']) {
3459                         $eventdata['end'] = datetime_convert($eventdata['timezone'], "UTC", $event['finish'], $mask);
3460                 }
3461                 if ($event['summary']) {
3462                         $eventdata['summary'] = html_entity_decode(bb2diaspora($event['summary']));
3463                 }
3464                 if ($event['desc']) {
3465                         $eventdata['description'] = html_entity_decode(bb2diaspora($event['desc']));
3466                 }
3467                 if ($event['location']) {
3468                         $location = array();
3469                         $location["address"] = html_entity_decode(bb2diaspora($event['location']));
3470                         $location["lat"] = 0;
3471                         $location["lng"] = 0;
3472                         $eventdata['location'] = $location;
3473                 }
3474
3475                 return $eventdata;
3476         }
3477
3478         /**
3479          * @brief Create a post (status message or reshare)
3480          *
3481          * @param array $item  The item that will be exported
3482          * @param array $owner the array of the item owner
3483          *
3484          * @return array
3485          * 'type' -> Message type ("status_message" or "reshare")
3486          * 'message' -> Array of XML elements of the status
3487          */
3488         public static function buildStatus($item, $owner)
3489         {
3490                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3491
3492                 $result = Cache::get($cachekey);
3493                 if (!is_null($result)) {
3494                         return $result;
3495                 }
3496
3497                 $myaddr = self::myHandle($owner);
3498
3499                 $public = (($item["private"]) ? "false" : "true");
3500
3501                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3502
3503                 // Detect a share element and do a reshare
3504                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3505                         $message = array("author" => $myaddr,
3506                                         "guid" => $item["guid"],
3507                                         "created_at" => $created,
3508                                         "root_author" => $ret["root_handle"],
3509                                         "root_guid" => $ret["root_guid"],
3510                                         "provider_display_name" => $item["app"],
3511                                         "public" => $public);
3512
3513                         $type = "reshare";
3514                 } else {
3515                         $title = $item["title"];
3516                         $body = $item["body"];
3517
3518                         // convert to markdown
3519                         $body = html_entity_decode(bb2diaspora($body));
3520
3521                         // Adding the title
3522                         if (strlen($title)) {
3523                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3524                         }
3525
3526                         if ($item["attach"]) {
3527                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3528                                 if (cnt) {
3529                                         $body .= "\n".t("Attachments:")."\n";
3530                                         foreach ($matches as $mtch) {
3531                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3532                                         }
3533                                 }
3534                         }
3535
3536                         $location = array();
3537
3538                         if ($item["location"] != "")
3539                                 $location["address"] = $item["location"];
3540
3541                         if ($item["coord"] != "") {
3542                                 $coord = explode(" ", $item["coord"]);
3543                                 $location["lat"] = $coord[0];
3544                                 $location["lng"] = $coord[1];
3545                         }
3546
3547                         $message = array("author" => $myaddr,
3548                                         "guid" => $item["guid"],
3549                                         "created_at" => $created,
3550                                         "public" => $public,
3551                                         "text" => $body,
3552                                         "provider_display_name" => $item["app"],
3553                                         "location" => $location);
3554
3555                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3556                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3557                                 unset($message["location"]);
3558                         }
3559
3560                         if ($item['event-id'] > 0) {
3561                                 $event = self::buildEvent($item['event-id']);
3562                                 if (count($event)) {
3563                                         $message['event'] = $event;
3564
3565                                         /// @todo Once Diaspora supports it, we will remove the body
3566                                         // $message['text'] = '';
3567                                 }
3568                         }
3569
3570                         $type = "status_message";
3571                 }
3572
3573                 $msg = array("type" => $type, "message" => $message);
3574
3575                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3576
3577                 return $msg;
3578         }
3579
3580         /**
3581          * @brief Sends a post
3582          *
3583          * @param array $item         The item that will be exported
3584          * @param array $owner        the array of the item owner
3585          * @param array $contact      Target of the communication
3586          * @param bool  $public_batch Is it a public post?
3587          *
3588          * @return int The result of the transmission
3589          */
3590         public static function sendStatus($item, $owner, $contact, $public_batch = false)
3591         {
3592                 $status = self::buildStatus($item, $owner);
3593
3594                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3595         }
3596
3597         /**
3598          * @brief Creates a "like" object
3599          *
3600          * @param array $item  The item that will be exported
3601          * @param array $owner the array of the item owner
3602          *
3603          * @return array The data for a "like"
3604          */
3605         private static function constructLike($item, $owner)
3606         {
3607                 $p = q(
3608                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3609                         dbesc($item["thr-parent"])
3610                 );
3611                 if (!DBM::is_result($p)) {
3612                         return false;
3613                 }
3614
3615                 $parent = $p[0];
3616
3617                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3618                 if ($item['verb'] === ACTIVITY_LIKE) {
3619                         $positive = "true";
3620                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3621                         $positive = "false";
3622                 }
3623
3624                 return(array("author" => self::myHandle($owner),
3625                                 "guid" => $item["guid"],
3626                                 "parent_guid" => $parent["guid"],
3627                                 "parent_type" => $target_type,
3628                                 "positive" => $positive,
3629                                 "author_signature" => ""));
3630         }
3631
3632         /**
3633          * @brief Creates an "EventParticipation" object
3634          *
3635          * @param array $item  The item that will be exported
3636          * @param array $owner the array of the item owner
3637          *
3638          * @return array The data for an "EventParticipation"
3639          */
3640         private static function constructAttend($item, $owner)
3641         {
3642                 $p = q(
3643                         "SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3644                         dbesc($item["thr-parent"])
3645                 );
3646                 if (!DBM::is_result($p)) {
3647                         return false;
3648                 }
3649
3650                 $parent = $p[0];
3651
3652                 switch ($item['verb']) {
3653                         case ACTIVITY_ATTEND:
3654                                 $attend_answer = 'accepted';
3655                                 break;
3656                         case ACTIVITY_ATTENDNO:
3657                                 $attend_answer = 'declined';
3658                                 break;
3659                         case ACTIVITY_ATTENDMAYBE:
3660                                 $attend_answer = 'tentative';
3661                                 break;
3662                         default:
3663                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3664                                 return false;
3665                 }
3666
3667                 return(array("author" => self::myHandle($owner),
3668                                 "guid" => $item["guid"],
3669                                 "parent_guid" => $parent["guid"],
3670                                 "status" => $attend_answer,
3671                                 "author_signature" => ""));
3672         }
3673
3674         /**
3675          * @brief Creates the object for a comment
3676          *
3677          * @param array $item  The item that will be exported
3678          * @param array $owner the array of the item owner
3679          *
3680          * @return array The data for a comment
3681          */
3682         private static function constructComment($item, $owner)
3683         {
3684                 $cachekey = "diaspora:constructComment:".$item['guid'];
3685
3686                 $result = Cache::get($cachekey);
3687                 if (!is_null($result)) {
3688                         return $result;
3689                 }
3690
3691                 $p = q(
3692                         "SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3693                         intval($item["parent"]),
3694                         intval($item["parent"])
3695                 );
3696
3697                 if (!DBM::is_result($p)) {
3698                         return false;
3699                 }
3700
3701                 $parent = $p[0];
3702
3703                 $text = html_entity_decode(bb2diaspora($item["body"]));
3704                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3705
3706                 $comment = array("author" => self::myHandle($owner),
3707                                 "guid" => $item["guid"],
3708                                 "created_at" => $created,
3709                                 "parent_guid" => $parent["guid"],
3710                                 "text" => $text,
3711                                 "author_signature" => "");
3712
3713                 // Send the thread parent guid only if it is a threaded comment
3714                 if ($item['thr-parent'] != $item['parent-uri']) {
3715                         $comment['thread_parent_guid'] = self::getGuidFromUri($item['thr-parent'], $item['uid']);
3716                 }
3717
3718                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3719
3720                 return($comment);
3721         }
3722
3723         /**
3724          * @brief Send a like or a comment
3725          *
3726          * @param array $item         The item that will be exported
3727          * @param array $owner        the array of the item owner
3728          * @param array $contact      Target of the communication
3729          * @param bool  $public_batch Is it a public post?
3730          *
3731          * @return int The result of the transmission
3732          */
3733         public static function sendFollowup($item, $owner, $contact, $public_batch = false)
3734         {
3735                 if (in_array($item['verb'], array(ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE))) {
3736                         $message = self::constructAttend($item, $owner);
3737                         $type = "event_participation";
3738                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3739                         $message = self::constructLike($item, $owner);
3740                         $type = "like";
3741                 } else {
3742                         $message = self::constructComment($item, $owner);
3743                         $type = "comment";
3744                 }
3745
3746                 if (!$message) {
3747                         return false;
3748                 }
3749
3750                 $message["author_signature"] = self::signature($owner, $message);
3751
3752                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3753         }
3754
3755         /**
3756          * @brief Creates a message from a signature record entry
3757          *
3758          * @param array $item      The item that will be exported
3759          * @param array $signature The entry of the "sign" record
3760          *
3761          * @return string The message
3762          */
3763         private static function messageFromSignature($item, $signature)
3764         {
3765                 // Split the signed text
3766                 $signed_parts = explode(";", $signature['signed_text']);
3767
3768                 if ($item["deleted"]) {
3769                         $message = array("author" => $signature['signer'],
3770                                         "target_guid" => $signed_parts[0],
3771                                         "target_type" => $signed_parts[1]);
3772                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3773                         $message = array("author" => $signed_parts[4],
3774                                         "guid" => $signed_parts[1],
3775                                         "parent_guid" => $signed_parts[3],
3776                                         "parent_type" => $signed_parts[2],
3777                                         "positive" => $signed_parts[0],
3778                                         "author_signature" => $signature['signature'],
3779                                         "parent_author_signature" => "");
3780                 } else {
3781                         // Remove the comment guid
3782                         $guid = array_shift($signed_parts);
3783
3784                         // Remove the parent guid
3785                         $parent_guid = array_shift($signed_parts);
3786
3787                         // Remove the handle
3788                         $handle = array_pop($signed_parts);
3789
3790                         // Glue the parts together
3791                         $text = implode(";", $signed_parts);
3792
3793                         $message = array("author" => $handle,
3794                                         "guid" => $guid,
3795                                         "parent_guid" => $parent_guid,
3796                                         "text" => implode(";", $signed_parts),
3797                                         "author_signature" => $signature['signature'],
3798                                         "parent_author_signature" => "");
3799                 }
3800                 return $message;
3801         }
3802
3803         /**
3804          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3805          *
3806          * @param array $item         The item that will be exported
3807          * @param array $owner        the array of the item owner
3808          * @param array $contact      Target of the communication
3809          * @param bool  $public_batch Is it a public post?
3810          *
3811          * @return int The result of the transmission
3812          */
3813         public static function sendRelay($item, $owner, $contact, $public_batch = false)
3814         {
3815                 if ($item["deleted"]) {
3816                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3817                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3818                         $type = "like";
3819                 } else {
3820                         $type = "comment";
3821                 }
3822
3823                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3824
3825                 // fetch the original signature
3826
3827                 $r = q(
3828                         "SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3829                         intval($item["id"])
3830                 );
3831
3832                 if (!$r) {
3833                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3834                         return false;
3835                 }
3836
3837                 $signature = $r[0];
3838
3839                 // Old way - is used by the internal Friendica functions
3840                 /// @todo Change all signatur storing functions to the new format
3841                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer']) {
3842                         $message = self::messageFromSignature($item, $signature);
3843                 } else {// New way
3844                         $msg = json_decode($signature['signed_text'], true);
3845
3846                         $message = array();
3847                         if (is_array($msg)) {
3848                                 foreach ($msg as $field => $data) {
3849                                         if (!$item["deleted"]) {
3850                                                 if ($field == "diaspora_handle") {
3851                                                         $field = "author";
3852                                                 }
3853                                                 if ($field == "target_type") {
3854                                                         $field = "parent_type";
3855                                                 }
3856                                         }
3857
3858                                         $message[$field] = $data;
3859                                 }
3860                         } else {
3861                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3862                         }
3863                 }
3864
3865                 $message["parent_author_signature"] = self::signature($owner, $message);
3866
3867                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3868
3869                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3870         }
3871
3872         /**
3873          * @brief Sends a retraction (deletion) of a message, like or comment
3874          *
3875          * @param array $item         The item that will be exported
3876          * @param array $owner        the array of the item owner
3877          * @param array $contact      Target of the communication
3878          * @param bool  $public_batch Is it a public post?
3879          * @param bool  $relay        Is the retraction transmitted from a relay?
3880          *
3881          * @return int The result of the transmission
3882          */
3883         public static function sendRetraction($item, $owner, $contact, $public_batch = false, $relay = false)
3884         {
3885                 $itemaddr = self::handleFromContact($item["contact-id"], $item["gcontact-id"]);
3886
3887                 $msg_type = "retraction";
3888
3889                 if ($item['id'] == $item['parent']) {
3890                         $target_type = "Post";
3891                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3892                         $target_type = "Like";
3893                 } else {
3894                         $target_type = "Comment";
3895                 }
3896
3897                 $message = array("author" => $itemaddr,
3898                                 "target_guid" => $item['guid'],
3899                                 "target_type" => $target_type);
3900
3901                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3902
3903                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3904         }
3905
3906         /**
3907          * @brief Sends a mail
3908          *
3909          * @param array $item    The item that will be exported
3910          * @param array $owner   The owner
3911          * @param array $contact Target of the communication
3912          *
3913          * @return int The result of the transmission
3914          */
3915         public static function sendMail($item, $owner, $contact)
3916         {
3917                 $myaddr = self::myHandle($owner);
3918
3919                 $r = q(
3920                         "SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3921                         intval($item["convid"]),
3922                         intval($item["uid"])
3923                 );
3924
3925                 if (!DBM::is_result($r)) {
3926                         logger("conversation not found.");
3927                         return;
3928                 }
3929                 $cnv = $r[0];
3930
3931                 $conv = array(
3932                         "author" => $cnv["creator"],
3933                         "guid" => $cnv["guid"],
3934                         "subject" => $cnv["subject"],
3935                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3936                         "participants" => $cnv["recips"]
3937                 );
3938
3939                 $body = bb2diaspora($item["body"]);
3940                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3941
3942                 $msg = array(
3943                         "author" => $myaddr,
3944                         "guid" => $item["guid"],
3945                         "conversation_guid" => $cnv["guid"],
3946                         "text" => $body,
3947                         "created_at" => $created,
3948                 );
3949
3950                 if ($item["reply"]) {
3951                         $message = $msg;
3952                         $type = "message";
3953                 } else {
3954                         $message = array(
3955                                         "author" => $cnv["creator"],
3956                                         "guid" => $cnv["guid"],
3957                                         "subject" => $cnv["subject"],
3958                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3959                                         "participants" => $cnv["recips"],
3960                                         "message" => $msg);
3961
3962                         $type = "conversation";
3963                 }
3964
3965                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
3966         }
3967
3968         /**
3969          * @brief Create profile data
3970          *
3971          * @param int $uid The user id
3972          *
3973          * @return array The profile data
3974          */
3975         private static function createProfileData($uid)
3976         {
3977                 $r = q(
3978                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3979                         FROM `profile`
3980                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3981                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3982                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3983                         intval($uid)
3984                 );
3985
3986                 if (!$r) {
3987                         return array();
3988                 }
3989
3990                 $profile = $r[0];
3991
3992                 $handle = $profile["addr"];
3993                 $first = ((strpos($profile['name'], ' ')
3994                         ? trim(substr($profile['name'], 0, strpos($profile['name'], ' '))) : $profile['name']));
3995                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3996                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3997                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3998                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3999                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4000
4001                 if ($searchable === 'true') {
4002                         $dob = '1000-00-00';
4003
4004                         if (($profile['dob']) && ($profile['dob'] > '0001-01-01')) {
4005                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC', 'UTC', $profile['dob'],'m-d');
4006                         }
4007
4008                         $about = $profile['about'];
4009                         $about = strip_tags(bbcode($about));
4010
4011                         $location = Profile::formatLocation($profile);
4012                         $tags = '';
4013                         if ($profile['pub_keywords']) {
4014                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4015                                 $kw = str_replace('  ', ' ', $kw);
4016                                 $arr = explode(' ', $profile['pub_keywords']);
4017                                 if (count($arr)) {
4018                                         for ($x = 0; $x < 5; $x ++) {
4019                                                 if (trim($arr[$x])) {
4020                                                         $tags .= '#'. trim($arr[$x]) .' ';
4021                                                 }
4022                                         }
4023                                 }
4024                         }
4025                         $tags = trim($tags);
4026                 }
4027
4028                 return array("author" => $handle,
4029                                 "first_name" => $first,
4030                                 "last_name" => $last,
4031                                 "image_url" => $large,
4032                                 "image_url_medium" => $medium,
4033                                 "image_url_small" => $small,
4034                                 "birthday" => $dob,
4035                                 "gender" => $profile['gender'],
4036                                 "bio" => $about,
4037                                 "location" => $location,
4038                                 "searchable" => $searchable,
4039                                 "nsfw" => "false",
4040                                 "tag_string" => $tags);
4041         }
4042
4043         /**
4044          * @brief Sends profile data
4045          *
4046          * @param int  $uid    The user id
4047          * @param bool $recips optional, default false
4048          * @return void
4049          */
4050         public static function sendProfile($uid, $recips = false)
4051         {
4052                 if (!$uid) {
4053                         return;
4054                 }
4055
4056                 if (!$recips) {
4057                         $recips = q(
4058                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4059                                 AND `uid` = %d AND `rel` != %d",
4060                                 dbesc(NETWORK_DIASPORA),
4061                                 intval($uid),
4062                                 intval(CONTACT_IS_SHARING)
4063                         );
4064                 }
4065
4066                 if (!$recips) {
4067                         return;
4068                 }
4069
4070                 $message = self::createProfileData($uid);
4071
4072                 foreach ($recips as $recip) {
4073                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
4074                         self::buildAndTransmit($profile, $recip, "profile", $message, false, "", true);
4075                 }
4076         }
4077
4078         /**
4079          * @brief Stores the signature for likes that are created on our system
4080          *
4081          * @param array $contact The contact array of the "like"
4082          * @param int   $post_id The post id of the "like"
4083          *
4084          * @return bool Success
4085          */
4086         public static function storeLikeSignature($contact, $post_id)
4087         {
4088                 // Is the contact the owner? Then fetch the private key
4089                 if (!$contact['self'] || ($contact['uid'] == 0)) {
4090                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
4091                         return false;
4092                 }
4093
4094                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
4095                 if (!DBM::is_result($r)) {
4096                         return false;
4097                 }
4098
4099                 $contact["uprvkey"] = $r[0]['prvkey'];
4100
4101                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
4102                 if (!DBM::is_result($r)) {
4103                         return false;
4104                 }
4105
4106                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
4107                         return false;
4108                 }
4109
4110                 $message = self::constructLike($r[0], $contact);
4111                 $message["author_signature"] = self::signature($contact, $message);
4112
4113                 /*
4114                  * Now store the signature more flexible to dynamically support new fields.
4115                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4116                  */
4117                 dba::insert('sign', array('iid' => $post_id, 'signed_text' => json_encode($message)));
4118
4119                 logger('Stored diaspora like signature');
4120                 return true;
4121         }
4122
4123         /**
4124          * @brief Stores the signature for comments that are created on our system
4125          *
4126          * @param array  $item       The item array of the comment
4127          * @param array  $contact    The contact array of the item owner
4128          * @param string $uprvkey    The private key of the sender
4129          * @param int    $message_id The message id of the comment
4130          *
4131          * @return bool Success
4132          */
4133         public static function storeCommentSignature($item, $contact, $uprvkey, $message_id)
4134         {
4135                 if ($uprvkey == "") {
4136                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
4137                         return false;
4138                 }
4139
4140                 $contact["uprvkey"] = $uprvkey;
4141
4142                 $message = self::constructComment($item, $contact);
4143                 $message["author_signature"] = self::signature($contact, $message);
4144
4145                 /*
4146                  * Now store the signature more flexible to dynamically support new fields.
4147                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
4148                  */
4149                 dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($message)));
4150
4151                 logger('Stored diaspora comment signature');
4152                 return true;
4153         }
4154 }