src/Protocol/Diaspora.php

   1 <?php
   2 namespace Friendica\Protocol;
   3
   4 /**
   5  * @file include/diaspora.php
   6  * @brief The implementation of the diaspora protocol
   7  *
   8  * The new protocol is described here: http://diaspora.github.io/diaspora_federation/index.html
   9  * This implementation here interprets the old and the new protocol and sends the new one.
  10  * In the future we will remove most stuff from "valid_posting" and interpret only the new protocol.
  11  */
  12
  13 use Friendica\App;
  14 use Friendica\Core\System;
  15 use Friendica\Core\Config;
  16 use Friendica\Core\PConfig;
  17 use Friendica\Core\Worker;
  18 use Friendica\Database\DBM;
  19 use Friendica\Network\Probe;
  20
  21 use Cache;
  22 use dba;
  23 use SimpleXMLElement;
  24 use xml;
  25
  26 require_once 'include/items.php';
  27 require_once 'include/bb2diaspora.php';
  28 require_once 'include/Contact.php';
  29 require_once 'include/Photo.php';
  30 require_once 'include/socgraph.php';
  31 require_once 'include/group.php';
  32 require_once 'include/datetime.php';
  33 require_once 'include/queue_fn.php';
  34
  35 /**
  36  * @brief This class contain functions to create and send Diaspora XML files
  37  *
  38  */
  39 class Diaspora {
  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 relay_list() {
  49
  50                 $serverdata = Config::get("system", "relay_server");
  51                 if ($serverdata == "")
  52                         return array();
  53
  54                 $relay = array();
  55
  56                 $servers = explode(",", $serverdata);
  57
  58                 foreach ($servers AS $server) {
  59                         $server = trim($server);
  60                         $addr = "relay@".str_replace("http://", "", normalise_link($server));
  61                         $batch = $server."/receive/public";
  62
  63                         $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' AND `addr` = '%s' AND `nurl` = '%s' LIMIT 1",
  64                                         dbesc($batch), dbesc($addr), dbesc(normalise_link($server)));
  65
  66                         if (!$relais) {
  67                                 $r = q("INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
  68                                         VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
  69                                         datetime_convert(),
  70                                         dbesc($addr),
  71                                         dbesc($addr),
  72                                         dbesc($server),
  73                                         dbesc(normalise_link($server)),
  74                                         dbesc($batch),
  75                                         dbesc(NETWORK_DIASPORA),
  76                                         intval(CONTACT_IS_FOLLOWER),
  77                                         dbesc(datetime_convert()),
  78                                         dbesc(datetime_convert()),
  79                                         dbesc(datetime_convert())
  80                                 );
  81
  82                                 $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  83                                 if ($relais)
  84                                         $relay[] = $relais[0];
  85                         } else
  86                                 $relay[] = $relais[0];
  87                 }
  88
  89                 return $relay;
  90         }
  91
  92         /**
  93          * @brief repairs a signature that was double encoded
  94          *
  95          * The function is unused at the moment. It was copied from the old implementation.
  96          *
  97          * @param string $signature The signature
  98          * @param string $handle The handle of the signature owner
  99          * @param integer $level This value is only set inside this function to avoid endless loops
 100          *
 101          * @return string the repaired signature
 102          */
 103         private static function repair_signature($signature, $handle = "", $level = 1) {
 104
 105                 if ($signature == "")
 106                         return ($signature);
 107
 108                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 109                         $signature = base64_decode($signature);
 110                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
 111
 112                         // Do a recursive call to be able to fix even multiple levels
 113                         if ($level < 10)
 114                                 $signature = self::repair_signature($signature, $handle, ++$level);
 115                 }
 116
 117                 return($signature);
 118         }
 119
 120         /**
 121          * @brief verify the envelope and return the verified data
 122          *
 123          * @param string $envelope The magic envelope
 124          *
 125          * @return string verified data
 126          */
 127         private static function verify_magic_envelope($envelope) {
 128
 129                 $basedom = parse_xml_string($envelope);
 130
 131                 if (!is_object($basedom)) {
 132                         logger("Envelope is no XML file");
 133                         return false;
 134                 }
 135
 136                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 137
 138                 if (sizeof($children) == 0) {
 139                         logger("XML has no children");
 140                         return false;
 141                 }
 142
 143                 $handle = "";
 144
 145                 $data = base64url_decode($children->data);
 146                 $type = $children->data->attributes()->type[0];
 147
 148                 $encoding = $children->encoding;
 149
 150                 $alg = $children->alg;
 151
 152                 $sig = base64url_decode($children->sig);
 153                 $key_id = $children->sig->attributes()->key_id[0];
 154                 if ($key_id != "")
 155                         $handle = base64url_decode($key_id);
 156
 157                 $b64url_data = base64url_encode($data);
 158                 $msg = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
 159
 160                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 161
 162                 $key = self::key($handle);
 163
 164                 $verify = rsa_verify($signable_data, $sig, $key);
 165                 if (!$verify) {
 166                         logger('Message did not verify. Discarding.');
 167                         return false;
 168                 }
 169
 170                 return $data;
 171         }
 172
 173         /**
 174          * @brief encrypts data via AES
 175          *
 176          * @param string $key The AES key
 177          * @param string $iv The IV (is used for CBC encoding)
 178          * @param string $data The data that is to be encrypted
 179          *
 180          * @return string encrypted data
 181          */
 182         private static function aes_encrypt($key, $iv, $data) {
 183                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 184         }
 185
 186         /**
 187          * @brief decrypts data via AES
 188          *
 189          * @param string $key The AES key
 190          * @param string $iv The IV (is used for CBC encoding)
 191          * @param string $encrypted The encrypted data
 192          *
 193          * @return string decrypted data
 194          */
 195         private static function aes_decrypt($key, $iv, $encrypted) {
 196                 return openssl_decrypt($encrypted,'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA,str_pad($iv, 16, "\0"));
 197         }
 198
 199         /**
 200          * @brief: Decodes incoming Diaspora message in the new format
 201          *
 202          * @param array $importer Array of the importer user
 203          * @param string $raw raw post message
 204          *
 205          * @return array
 206          * 'message' -> decoded Diaspora XML message
 207          * 'author' -> author diaspora handle
 208          * 'key' -> author public key (converted to pkcs#8)
 209          */
 210         public static function decode_raw($importer, $raw) {
 211                 $data = json_decode($raw);
 212
 213                 // Is it a private post? Then decrypt the outer Salmon
 214                 if (is_object($data)) {
 215                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 216                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 217
 218                         $outer_key_bundle = '';
 219                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 220                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 221
 222                         if (!is_object($j_outer_key_bundle)) {
 223                                 logger('Outer Salmon did not verify. Discarding.');
 224                                 http_status_exit(400);
 225                         }
 226
 227                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 228                         $outer_key = base64_decode($j_outer_key_bundle->key);
 229
 230                         $xml = self::aes_decrypt($outer_key, $outer_iv, $ciphertext);
 231                 } else {
 232                         $xml = $raw;
 233                 }
 234
 235                 $basedom = parse_xml_string($xml);
 236
 237                 if (!is_object($basedom)) {
 238                         logger('Received data does not seem to be an XML. Discarding. '.$xml);
 239                         http_status_exit(400);
 240                 }
 241
 242                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 243
 244                 // Not sure if this cleaning is needed
 245                 $data = str_replace(array(" ", "\t", "\r", "\n"), array("", "", "", ""), $base->data);
 246
 247                 // Build the signed data
 248                 $type = $base->data[0]->attributes()->type[0];
 249                 $encoding = $base->encoding;
 250                 $alg = $base->alg;
 251                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 252
 253                 // This is the signature
 254                 $signature = base64url_decode($base->sig);
 255
 256                 // Get the senders' public key
 257                 $key_id = $base->sig[0]->attributes()->key_id[0];
 258                 $author_addr = base64_decode($key_id);
 259                 $key = self::key($author_addr);
 260
 261                 $verify = rsa_verify($signed_data, $signature, $key);
 262                 if (!$verify) {
 263                         logger('Message did not verify. Discarding.');
 264                         http_status_exit(400);
 265                 }
 266
 267                 return array('message' => (string)base64url_decode($base->data),
 268                                 'author' => unxmlify($author_addr),
 269                                 'key' => (string)$key);
 270         }
 271
 272         /**
 273          * @brief: Decodes incoming Diaspora message in the deprecated format
 274          *
 275          * @param array $importer Array of the importer user
 276          * @param string $xml urldecoded Diaspora salmon
 277          *
 278          * @return array
 279          * 'message' -> decoded Diaspora XML message
 280          * 'author' -> author diaspora handle
 281          * 'key' -> author public key (converted to pkcs#8)
 282          */
 283         public static function decode($importer, $xml) {
 284
 285                 $public = false;
 286                 $basedom = parse_xml_string($xml);
 287
 288                 if (!is_object($basedom)) {
 289                         logger("XML is not parseable.");
 290                         return false;
 291                 }
 292                 $children = $basedom->children('https://joindiaspora.com/protocol');
 293
 294                 if ($children->header) {
 295                         $public = true;
 296                         $author_link = str_replace('acct:','',$children->header->author_id);
 297                 } else {
 298                         // This happens with posts from a relais
 299                         if (!$importer) {
 300                                 logger("This is no private post in the old format", LOGGER_DEBUG);
 301                                 return false;
 302                         }
 303
 304                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 305
 306                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 307                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 308
 309                         $outer_key_bundle = '';
 310                         openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
 311
 312                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 313
 314                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 315                         $outer_key = base64_decode($j_outer_key_bundle->key);
 316
 317                         $decrypted = self::aes_decrypt($outer_key, $outer_iv, $ciphertext);
 318
 319                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 320                         $idom = parse_xml_string($decrypted);
 321
 322                         $inner_iv = base64_decode($idom->iv);
 323                         $inner_aes_key = base64_decode($idom->aes_key);
 324
 325                         $author_link = str_replace('acct:','',$idom->author_id);
 326                 }
 327
 328                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 329
 330                 // figure out where in the DOM tree our data is hiding
 331
 332                 if ($dom->provenance->data)
 333                         $base = $dom->provenance;
 334                 elseif ($dom->env->data)
 335                         $base = $dom->env;
 336                 elseif ($dom->data)
 337                         $base = $dom;
 338
 339                 if (!$base) {
 340                         logger('unable to locate salmon data in xml');
 341                         http_status_exit(400);
 342                 }
 343
 344
 345                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 346                 $signature = base64url_decode($base->sig);
 347
 348                 // unpack the  data
 349
 350                 // strip whitespace so our data element will return to one big base64 blob
 351                 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
 352
 353
 354                 // stash away some other stuff for later
 355
 356                 $type = $base->data[0]->attributes()->type[0];
 357                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 358                 $encoding = $base->encoding;
 359                 $alg = $base->alg;
 360
 361
 362                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 363
 364
 365                 // decode the data
 366                 $data = base64url_decode($data);
 367
 368
 369                 if ($public)
 370                         $inner_decrypted = $data;
 371                 else {
 372
 373                         // Decode the encrypted blob
 374
 375                         $inner_encrypted = base64_decode($data);
 376                         $inner_decrypted = self::aes_decrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 377                 }
 378
 379                 if (!$author_link) {
 380                         logger('Could not retrieve author URI.');
 381                         http_status_exit(400);
 382                 }
 383                 // Once we have the author URI, go to the web and try to find their public key
 384                 // (first this will look it up locally if it is in the fcontact cache)
 385                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 386
 387                 logger('Fetching key for '.$author_link);
 388                 $key = self::key($author_link);
 389
 390                 if (!$key) {
 391                         logger('Could not retrieve author key.');
 392                         http_status_exit(400);
 393                 }
 394
 395                 $verify = rsa_verify($signed_data,$signature,$key);
 396
 397                 if (!$verify) {
 398                         logger('Message did not verify. Discarding.');
 399                         http_status_exit(400);
 400                 }
 401
 402                 logger('Message verified.');
 403
 404                 return array('message' => (string)$inner_decrypted,
 405                                 'author' => unxmlify($author_link),
 406                                 'key' => (string)$key);
 407         }
 408
 409
 410         /**
 411          * @brief Dispatches public messages and find the fitting receivers
 412          *
 413          * @param array $msg The post that will be dispatched
 414          *
 415          * @return int The message id of the generated message, "true" or "false" if there was an error
 416          */
 417         public static function dispatch_public($msg) {
 418
 419                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 420                 if (!$enabled) {
 421                         logger("diaspora is disabled");
 422                         return false;
 423                 }
 424
 425                 if (!($postdata = self::valid_posting($msg))) {
 426                         logger("Invalid posting");
 427                         return false;
 428                 }
 429
 430                 $fields = $postdata['fields'];
 431
 432                 // Is it a an action (comment, like, ...) for our own post?
 433                 if (isset($fields->parent_guid) && !$postdata["relayed"]) {
 434                         $guid = notags(unxmlify($fields->parent_guid));
 435                         $importer = self::importer_for_guid($guid);
 436                         if (is_array($importer)) {
 437                                 logger("delivering to origin: ".$importer["name"]);
 438                                 $message_id = self::dispatch($importer, $msg, $fields);
 439                                 return $message_id;
 440                         }
 441                 }
 442
 443                 // Process item retractions. This has to be done separated from the other stuff,
 444                 // since retractions for comments could come even from non followers.
 445                 if (!empty($fields) && in_array($fields->getName(), array('retraction'))) {
 446                         $target = notags(unxmlify($fields->target_type));
 447                         if (in_array($target, array("Comment", "Like", "Post", "Reshare", "StatusMessage"))) {
 448                                 logger('processing retraction for '.$target, LOGGER_DEBUG);
 449                                 $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 450                                 $message_id = self::dispatch($importer, $msg, $fields);
 451                                 return $message_id;
 452                         }
 453                 }
 454
 455                 // Now distribute it to the followers
 456                 $r = q("SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 457                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 458                         AND NOT `account_expired` AND NOT `account_removed`",
 459                         dbesc(NETWORK_DIASPORA),
 460                         dbesc($msg["author"])
 461                 );
 462
 463                 if (DBM::is_result($r)) {
 464                         foreach ($r as $rr) {
 465                                 logger("delivering to: ".$rr["username"]);
 466                                 self::dispatch($rr, $msg, $fields);
 467                         }
 468                 } elseif (!Config::get('system', 'relay_subscribe', false)) {
 469                         logger("Unwanted message from ".$msg["author"]." send by ".$_SERVER["REMOTE_ADDR"]." with ".$_SERVER["HTTP_USER_AGENT"].": ".print_r($msg, true), LOGGER_DEBUG);
 470                 } else {
 471                         // Use a dummy importer to import the data for the public copy
 472                         $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 473                         $message_id = self::dispatch($importer, $msg, $fields);
 474                 }
 475
 476                 return $message_id;
 477         }
 478
 479         /**
 480          * @brief Dispatches the different message types to the different functions
 481          *
 482          * @param array $importer Array of the importer user
 483          * @param array $msg The post that will be dispatched
 484          * @param object $fields SimpleXML object that contains the message
 485          *
 486          * @return int The message id of the generated message, "true" or "false" if there was an error
 487          */
 488         public static function dispatch($importer, $msg, $fields = null) {
 489
 490                 // The sender is the handle of the contact that sent the message.
 491                 // This will often be different with relayed messages (for example "like" and "comment")
 492                 $sender = $msg["author"];
 493
 494                 // This is only needed for private postings since this is already done for public ones before
 495                 if (is_null($fields)) {
 496                         if (!($postdata = self::valid_posting($msg))) {
 497                                 logger("Invalid posting");
 498                                 return false;
 499                         }
 500                         $fields = $postdata['fields'];
 501                 }
 502
 503                 $type = $fields->getName();
 504
 505                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 506
 507                 switch ($type) {
 508                         case "account_migration":
 509                                 return self::receiveAccountMigration($importer, $fields);
 510
 511                         case "account_deletion":
 512                                 return self::receive_account_deletion($importer, $fields);
 513
 514                         case "comment":
 515                                 return self::receive_comment($importer, $sender, $fields, $msg["message"]);
 516
 517                         case "contact":
 518                                 return self::receive_contact_request($importer, $fields);
 519
 520                         case "conversation":
 521                                 return self::receive_conversation($importer, $msg, $fields);
 522
 523                         case "like":
 524                                 return self::receive_like($importer, $sender, $fields);
 525
 526                         case "message":
 527                                 return self::receive_message($importer, $fields);
 528
 529                         case "participation": // Not implemented
 530                                 return self::receive_participation($importer, $fields);
 531
 532                         case "photo": // Not implemented
 533                                 return self::receive_photo($importer, $fields);
 534
 535                         case "poll_participation": // Not implemented
 536                                 return self::receive_poll_participation($importer, $fields);
 537
 538                         case "profile":
 539                                 return self::receive_profile($importer, $fields);
 540
 541                         case "reshare":
 542                                 return self::receive_reshare($importer, $fields, $msg["message"]);
 543
 544                         case "retraction":
 545                                 return self::receive_retraction($importer, $sender, $fields);
 546
 547                         case "status_message":
 548                                 return self::receive_status_message($importer, $fields, $msg["message"]);
 549
 550                         default:
 551                                 logger("Unknown message type ".$type);
 552                                 return false;
 553                 }
 554
 555                 return true;
 556         }
 557
 558         /**
 559          * @brief Checks if a posting is valid and fetches the data fields.
 560          *
 561          * This function does not only check the signature.
 562          * It also does the conversion between the old and the new diaspora format.
 563          *
 564          * @param array $msg Array with the XML, the sender handle and the sender signature
 565          *
 566          * @return bool|array If the posting is valid then an array with an SimpleXML object is returned
 567          */
 568         private static function valid_posting($msg) {
 569
 570                 $data = parse_xml_string($msg["message"]);
 571
 572                 if (!is_object($data)) {
 573                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 574                         return false;
 575                 }
 576
 577                 $first_child = $data->getName();
 578
 579                 // Is this the new or the old version?
 580                 if ($data->getName() == "XML") {
 581                         $oldXML = true;
 582                         foreach ($data->post->children() as $child)
 583                                 $element = $child;
 584                 } else {
 585                         $oldXML = false;
 586                         $element = $data;
 587                 }
 588
 589                 $type = $element->getName();
 590                 $orig_type = $type;
 591
 592                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 593
 594                 // All retractions are handled identically from now on.
 595                 // In the new version there will only be "retraction".
 596                 if (in_array($type, array("signed_retraction", "relayable_retraction")))
 597                         $type = "retraction";
 598
 599                 if ($type == "request")
 600                         $type = "contact";
 601
 602                 $fields = new SimpleXMLElement("<".$type."/>");
 603
 604                 $signed_data = "";
 605
 606                 foreach ($element->children() AS $fieldname => $entry) {
 607                         if ($oldXML) {
 608                                 // Translation for the old XML structure
 609                                 if ($fieldname == "diaspora_handle") {
 610                                         $fieldname = "author";
 611                                 }
 612                                 if ($fieldname == "participant_handles") {
 613                                         $fieldname = "participants";
 614                                 }
 615                                 if (in_array($type, array("like", "participation"))) {
 616                                         if ($fieldname == "target_type") {
 617                                                 $fieldname = "parent_type";
 618                                         }
 619                                 }
 620                                 if ($fieldname == "sender_handle") {
 621                                         $fieldname = "author";
 622                                 }
 623                                 if ($fieldname == "recipient_handle") {
 624                                         $fieldname = "recipient";
 625                                 }
 626                                 if ($fieldname == "root_diaspora_id") {
 627                                         $fieldname = "root_author";
 628                                 }
 629                                 if ($type == "status_message") {
 630                                         if ($fieldname == "raw_message") {
 631                                                 $fieldname = "text";
 632                                         }
 633                                 }
 634                                 if ($type == "retraction") {
 635                                         if ($fieldname == "post_guid") {
 636                                                 $fieldname = "target_guid";
 637                                         }
 638                                         if ($fieldname == "type") {
 639                                                 $fieldname = "target_type";
 640                                         }
 641                                 }
 642                         }
 643
 644                         if (($fieldname == "author_signature") && ($entry != ""))
 645                                 $author_signature = base64_decode($entry);
 646                         elseif (($fieldname == "parent_author_signature") && ($entry != ""))
 647                                 $parent_author_signature = base64_decode($entry);
 648                         elseif (!in_array($fieldname, array("author_signature", "parent_author_signature", "target_author_signature"))) {
 649                                 if ($signed_data != "") {
 650                                         $signed_data .= ";";
 651                                         $signed_data_parent .= ";";
 652                                 }
 653
 654                                 $signed_data .= $entry;
 655                         }
 656                         if (!in_array($fieldname, array("parent_author_signature", "target_author_signature")) ||
 657                                 ($orig_type == "relayable_retraction"))
 658                                 xml::copy($entry, $fields, $fieldname);
 659                 }
 660
 661                 // This is something that shouldn't happen at all.
 662                 if (in_array($type, array("status_message", "reshare", "profile")))
 663                         if ($msg["author"] != $fields->author) {
 664                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 665                                 return false;
 666                         }
 667
 668                 // Only some message types have signatures. So we quit here for the other types.
 669                 if (!in_array($type, array("comment", "like"))) {
 670                         return array("fields" => $fields, "relayed" => false);
 671                 }
 672                 // No author_signature? This is a must, so we quit.
 673                 if (!isset($author_signature)) {
 674                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 675                         return false;
 676                 }
 677
 678                 if (isset($parent_author_signature)) {
 679                         $relayed = true;
 680
 681                         $key = self::key($msg["author"]);
 682
 683                         if (!rsa_verify($signed_data, $parent_author_signature, $key, "sha256")) {
 684                                 logger("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 685                                 return false;
 686                         }
 687                 } else {
 688                         $relayed = false;
 689                 }
 690
 691                 $key = self::key($fields->author);
 692
 693                 if (!rsa_verify($signed_data, $author_signature, $key, "sha256")) {
 694                         logger("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 695                         return false;
 696                 } else {
 697                         return array("fields" => $fields, "relayed" => $relayed);
 698                 }
 699         }
 700
 701         /**
 702          * @brief Fetches the public key for a given handle
 703          *
 704          * @param string $handle The handle
 705          *
 706          * @return string The public key
 707          */
 708         private static function key($handle) {
 709                 $handle = strval($handle);
 710
 711                 logger("Fetching diaspora key for: ".$handle);
 712
 713                 $r = self::person_by_handle($handle);
 714                 if ($r)
 715                         return $r["pubkey"];
 716
 717                 return "";
 718         }
 719
 720         /**
 721          * @brief Fetches data for a given handle
 722          *
 723          * @param string $handle The handle
 724          *
 725          * @return array the queried data
 726          */
 727         public static function person_by_handle($handle) {
 728
 729                 $r = q("SELECT * FROM `fcontact` WHERE `network` = '%s' AND `addr` = '%s' LIMIT 1",
 730                         dbesc(NETWORK_DIASPORA),
 731                         dbesc($handle)
 732                 );
 733                 if ($r) {
 734                         $person = $r[0];
 735                         logger("In cache ".print_r($r,true), LOGGER_DEBUG);
 736
 737                         // update record occasionally so it doesn't get stale
 738                         $d = strtotime($person["updated"]." +00:00");
 739                         if ($d < strtotime("now - 14 days"))
 740                                 $update = true;
 741
 742                         if ($person["guid"] == "")
 743                                 $update = true;
 744                 }
 745
 746                 if (!$person || $update) {
 747                         logger("create or refresh", LOGGER_DEBUG);
 748                         $r = Probe::uri($handle, NETWORK_DIASPORA);
 749
 750                         // Note that Friendica contacts will return a "Diaspora person"
 751                         // if Diaspora connectivity is enabled on their server
 752                         if ($r && ($r["network"] === NETWORK_DIASPORA)) {
 753                                 self::add_fcontact($r, $update);
 754                                 $person = $r;
 755                         }
 756                 }
 757                 return $person;
 758         }
 759
 760         /**
 761          * @brief Updates the fcontact table
 762          *
 763          * @param array $arr The fcontact data
 764          * @param bool $update Update or insert?
 765          *
 766          * @return string The id of the fcontact entry
 767          */
 768         private static function add_fcontact($arr, $update = false) {
 769
 770                 if ($update) {
 771                         $r = q("UPDATE `fcontact` SET
 772                                         `name` = '%s',
 773                                         `photo` = '%s',
 774                                         `request` = '%s',
 775                                         `nick` = '%s',
 776                                         `addr` = '%s',
 777                                         `guid` = '%s',
 778                                         `batch` = '%s',
 779                                         `notify` = '%s',
 780                                         `poll` = '%s',
 781                                         `confirm` = '%s',
 782                                         `alias` = '%s',
 783                                         `pubkey` = '%s',
 784                                         `updated` = '%s'
 785                                 WHERE `url` = '%s' AND `network` = '%s'",
 786                                         dbesc($arr["name"]),
 787                                         dbesc($arr["photo"]),
 788                                         dbesc($arr["request"]),
 789                                         dbesc($arr["nick"]),
 790                                         dbesc(strtolower($arr["addr"])),
 791                                         dbesc($arr["guid"]),
 792                                         dbesc($arr["batch"]),
 793                                         dbesc($arr["notify"]),
 794                                         dbesc($arr["poll"]),
 795                                         dbesc($arr["confirm"]),
 796                                         dbesc($arr["alias"]),
 797                                         dbesc($arr["pubkey"]),
 798                                         dbesc(datetime_convert()),
 799                                         dbesc($arr["url"]),
 800                                         dbesc($arr["network"])
 801                                 );
 802                 } else {
 803                         $r = q("INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`, `guid`,
 804                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 805                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 806                                         dbesc($arr["url"]),
 807                                         dbesc($arr["name"]),
 808                                         dbesc($arr["photo"]),
 809                                         dbesc($arr["request"]),
 810                                         dbesc($arr["nick"]),
 811                                         dbesc($arr["addr"]),
 812                                         dbesc($arr["guid"]),
 813                                         dbesc($arr["batch"]),
 814                                         dbesc($arr["notify"]),
 815                                         dbesc($arr["poll"]),
 816                                         dbesc($arr["confirm"]),
 817                                         dbesc($arr["network"]),
 818                                         dbesc($arr["alias"]),
 819                                         dbesc($arr["pubkey"]),
 820                                         dbesc(datetime_convert())
 821                                 );
 822                 }
 823
 824                 return $r;
 825         }
 826
 827         /**
 828          * @brief get a handle (user@domain.tld) from a given contact id or gcontact id
 829          *
 830          * @param int $contact_id The id in the contact table
 831          * @param int $gcontact_id The id in the gcontact table
 832          *
 833          * @return string the handle
 834          */
 835         public static function handle_from_contact($contact_id, $gcontact_id = 0) {
 836                 $handle = false;
 837
 838                 logger("contact id is ".$contact_id." - gcontact id is ".$gcontact_id, LOGGER_DEBUG);
 839
 840                 if ($gcontact_id != 0) {
 841                         $r = q("SELECT `addr` FROM `gcontact` WHERE `id` = %d AND `addr` != ''",
 842                                 intval($gcontact_id));
 843
 844                         if (DBM::is_result($r)) {
 845                                 return strtolower($r[0]["addr"]);
 846                         }
 847                 }
 848
 849                 $r = q("SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 850                         intval($contact_id));
 851
 852                 if (DBM::is_result($r)) {
 853                         $contact = $r[0];
 854
 855                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 856
 857                         if ($contact['addr'] != "") {
 858                                 $handle = $contact['addr'];
 859                         } else {
 860                                 $baseurl_start = strpos($contact['url'],'://') + 3;
 861                                 $baseurl_length = strpos($contact['url'],'/profile') - $baseurl_start; // allows installations in a subdirectory--not sure how Diaspora will handle
 862                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 863                                 $handle = $contact['nick'].'@'.$baseurl;
 864                         }
 865                 }
 866
 867                 return strtolower($handle);
 868         }
 869
 870         /**
 871          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
 872          * fcontact guid
 873          *
 874          * @param mixed $fcontact_guid Hexadecimal string guid
 875          *
 876          * @return string the contact url or null
 877          */
 878         public static function url_from_contact_guid($fcontact_guid) {
 879                 logger("fcontact guid is ".$fcontact_guid, LOGGER_DEBUG);
 880
 881                 $r = q("SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
 882                         dbesc(NETWORK_DIASPORA),
 883                         dbesc($fcontact_guid)
 884                 );
 885
 886                 if (DBM::is_result($r)) {
 887                         return $r[0]['url'];
 888                 }
 889
 890                 return null;
 891         }
 892
 893         /**
 894          * @brief Get a contact id for a given handle
 895          *
 896          * @param int $uid The user id
 897          * @param string $handle The handle in the format user@domain.tld
 898          *
 899          * @return The contact id
 900          */
 901         private static function contact_by_handle($uid, $handle) {
 902
 903                 // First do a direct search on the contact table
 904                 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
 905                         intval($uid),
 906                         dbesc($handle)
 907                 );
 908
 909                 if (DBM::is_result($r)) {
 910                         return $r[0];
 911                 } else {
 912                         /*
 913                          * We haven't found it?
 914                          * We use another function for it that will possibly create a contact entry.
 915                          */
 916                         $cid = get_contact($handle, $uid);
 917
 918                         if ($cid > 0) {
 919                                 /// @TODO Contact retrieval should be encapsulated into an "entity" class like `Contact`
 920                                 $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($cid));
 921
 922                                 if (DBM::is_result($r)) {
 923                                         return $r[0];
 924                                 }
 925                         }
 926                 }
 927
 928                 $handle_parts = explode("@", $handle);
 929                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
 930                 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
 931                         dbesc(NETWORK_DFRN),
 932                         intval($uid),
 933                         dbesc($nurl_sql)
 934                 );
 935                 if (DBM::is_result($r)) {
 936                         return $r[0];
 937                 }
 938
 939                 logger("Haven't found contact for user ".$uid." and handle ".$handle, LOGGER_DEBUG);
 940                 return false;
 941         }
 942
 943         /**
 944          * @brief Check if posting is allowed for this contact
 945          *
 946          * @param array $importer Array of the importer user
 947          * @param array $contact The contact that is checked
 948          * @param bool $is_comment Is the check for a comment?
 949          *
 950          * @return bool is the contact allowed to post?
 951          */
 952         private static function post_allow($importer, $contact, $is_comment = false) {
 953
 954                 /*
 955                  * Perhaps we were already sharing with this person. Now they're sharing with us.
 956                  * That makes us friends.
 957                  * Normally this should have handled by getting a request - but this could get lost
 958                  */
 959                 if ($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
 960                         dba::update('contact', array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
 961                                         array('id' => $contact["id"], 'uid' => $contact["uid"]));
 962
 963                         $contact["rel"] = CONTACT_IS_FRIEND;
 964                         logger("defining user ".$contact["nick"]." as friend");
 965                 }
 966
 967                 // We don't seem to like that person
 968                 if ($contact["blocked"] || $contact["readonly"] || $contact["archive"]) {
 969                         // Maybe blocked, don't accept.
 970                         return false;
 971                 // We are following this person?
 972                 } elseif (($contact["rel"] == CONTACT_IS_SHARING) || ($contact["rel"] == CONTACT_IS_FRIEND)) {
 973                         // Yes, then it is fine.
 974                         return true;
 975                 // Is it a post to a community?
 976                 } elseif (($contact["rel"] == CONTACT_IS_FOLLOWER) && ($importer["page-flags"] == PAGE_COMMUNITY)) {
 977                         // That's good
 978                         return true;
 979                 // Is the message a global user or a comment?
 980                 } elseif (($importer["uid"] == 0) || $is_comment) {
 981                         // Messages for the global users and comments are always accepted
 982                         return true;
 983                 }
 984
 985                 return false;
 986         }
 987
 988         /**
 989          * @brief Fetches the contact id for a handle and checks if posting is allowed
 990          *
 991          * @param array $importer Array of the importer user
 992          * @param string $handle The checked handle in the format user@domain.tld
 993          * @param bool $is_comment Is the check for a comment?
 994          *
 995          * @return array The contact data
 996          */
 997         private static function allowed_contact_by_handle($importer, $handle, $is_comment = false) {
 998                 $contact = self::contact_by_handle($importer["uid"], $handle);
 999                 if (!$contact) {
1000                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1001                         // If a contact isn't found, we accept it anyway if it is a comment
1002                         if ($is_comment) {
1003                                 return $importer;
1004                         } else {
1005                                 return false;
1006                         }
1007                 }
1008
1009                 if (!self::post_allow($importer, $contact, $is_comment)) {
1010                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1011                         return false;
1012                 }
1013                 return $contact;
1014         }
1015
1016         /**
1017          * @brief Does the message already exists on the system?
1018          *
1019          * @param int $uid The user id
1020          * @param string $guid The guid of the message
1021          *
1022          * @return int|bool message id if the message already was stored into the system - or false.
1023          */
1024         private static function message_exists($uid, $guid) {
1025                 $r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1026                         intval($uid),
1027                         dbesc($guid)
1028                 );
1029
1030                 if (DBM::is_result($r)) {
1031                         logger("message ".$guid." already exists for user ".$uid);
1032                         return $r[0]["id"];
1033                 }
1034
1035                 return false;
1036         }
1037
1038         /**
1039          * @brief Checks for links to posts in a message
1040          *
1041          * @param array $item The item array
1042          */
1043         private static function fetch_guid($item) {
1044                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1045                 preg_replace_callback($expression,
1046                         function ($match) use ($item) {
1047                                 return self::fetch_guid_sub($match, $item);
1048                         }, $item["body"]);
1049
1050                 preg_replace_callback("&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1051                         function ($match) use ($item) {
1052                                 return self::fetch_guid_sub($match, $item);
1053                         }, $item["body"]);
1054         }
1055
1056         /**
1057          * @brief Checks for relative /people/* links in an item body to match local
1058          * contacts or prepends the remote host taken from the author link.
1059          *
1060          * @param string $body The item body to replace links from
1061          * @param string $author_link The author link for missing local contact fallback
1062          *
1063          * @return the replaced string
1064          */
1065         public static function replace_people_guid($body, $author_link) {
1066                 $return = preg_replace_callback("&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1067                         function ($match) use ($author_link) {
1068                                 // $match
1069                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1070                                 // 1 => '0123456789abcdef'
1071                                 // 2 => 'Foo Bar'
1072                                 $handle = self::url_from_contact_guid($match[1]);
1073
1074                                 if ($handle) {
1075                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1076                                 } else {
1077                                         // No local match, restoring absolute remote URL from author scheme and host
1078                                         $author_url = parse_url($author_link);
1079                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1080                                 }
1081
1082                                 return $return;
1083                         }, $body);
1084
1085                 return $return;
1086         }
1087
1088         /**
1089          * @brief sub function of "fetch_guid" which checks for links in messages
1090          *
1091          * @param array $match array containing a link that has to be checked for a message link
1092          * @param array $item The item array
1093          */
1094         private static function fetch_guid_sub($match, $item) {
1095                 if (!self::store_by_guid($match[1], $item["author-link"]))
1096                         self::store_by_guid($match[1], $item["owner-link"]);
1097         }
1098
1099         /**
1100          * @brief Fetches an item with a given guid from a given server
1101          *
1102          * @param string $guid the message guid
1103          * @param string $server The server address
1104          * @param int $uid The user id of the user
1105          *
1106          * @return int the message id of the stored message or false
1107          */
1108         private static function store_by_guid($guid, $server, $uid = 0) {
1109                 $serverparts = parse_url($server);
1110                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1111
1112                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
1113
1114                 $msg = self::message($guid, $server);
1115
1116                 if (!$msg)
1117                         return false;
1118
1119                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
1120
1121                 // Now call the dispatcher
1122                 return self::dispatch_public($msg);
1123         }
1124
1125         /**
1126          * @brief Fetches a message from a server
1127          *
1128          * @param string $guid message guid
1129          * @param string $server The url of the server
1130          * @param int $level Endless loop prevention
1131          *
1132          * @return array
1133          *      'message' => The message XML
1134          *      'author' => The author handle
1135          *      'key' => The public key of the author
1136          */
1137         private static function message($guid, $server, $level = 0) {
1138
1139                 if ($level > 5)
1140                         return false;
1141
1142                 // This will work for new Diaspora servers and Friendica servers from 3.5
1143                 $source_url = $server."/fetch/post/".urlencode($guid);
1144
1145                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1146
1147                 $envelope = fetch_url($source_url);
1148                 if ($envelope) {
1149                         logger("Envelope was fetched.", LOGGER_DEBUG);
1150                         $x = self::verify_magic_envelope($envelope);
1151                         if (!$x)
1152                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
1153                         else
1154                                 logger("Envelope was verified.", LOGGER_DEBUG);
1155                 } else
1156                         $x = false;
1157
1158                 // This will work for older Diaspora and Friendica servers
1159                 if (!$x) {
1160                         $source_url = $server."/p/".urlencode($guid).".xml";
1161                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
1162
1163                         $x = fetch_url($source_url);
1164                         if (!$x)
1165                                 return false;
1166                 }
1167
1168                 $source_xml = parse_xml_string($x);
1169
1170                 if (!is_object($source_xml))
1171                         return false;
1172
1173                 if ($source_xml->post->reshare) {
1174                         // Reshare of a reshare - old Diaspora version
1175                         logger("Message is a reshare", LOGGER_DEBUG);
1176                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1177                 } elseif ($source_xml->getName() == "reshare") {
1178                         // Reshare of a reshare - new Diaspora version
1179                         logger("Message is a new reshare", LOGGER_DEBUG);
1180                         return self::message($source_xml->root_guid, $server, ++$level);
1181                 }
1182
1183                 $author = "";
1184
1185                 // Fetch the author - for the old and the new Diaspora version
1186                 if ($source_xml->post->status_message->diaspora_handle)
1187                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1188                 elseif ($source_xml->author && ($source_xml->getName() == "status_message"))
1189                         $author = (string)$source_xml->author;
1190
1191                 // If this isn't a "status_message" then quit
1192                 if (!$author) {
1193                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
1194                         return false;
1195                 }
1196
1197                 $msg = array("message" => $x, "author" => $author);
1198
1199                 $msg["key"] = self::key($msg["author"]);
1200
1201                 return $msg;
1202         }
1203
1204         /**
1205          * @brief Fetches the item record of a given guid
1206          *
1207          * @param int $uid The user id
1208          * @param string $guid message guid
1209          * @param string $author The handle of the item
1210          * @param array $contact The contact of the item owner
1211          *
1212          * @return array the item record
1213          */
1214         private static function parent_item($uid, $guid, $author, $contact) {
1215                 $r = q("SELECT `id`, `parent`, `body`, `wall`, `uri`, `guid`, `private`, `origin`,
1216                                 `author-name`, `author-link`, `author-avatar`,
1217                                 `owner-name`, `owner-link`, `owner-avatar`
1218                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1219                         intval($uid), dbesc($guid));
1220
1221                 if (!$r) {
1222                         $result = self::store_by_guid($guid, $contact["url"], $uid);
1223
1224                         if (!$result) {
1225                                 $person = self::person_by_handle($author);
1226                                 $result = self::store_by_guid($guid, $person["url"], $uid);
1227                         }
1228
1229                         if ($result) {
1230                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
1231
1232                                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
1233                                                 `author-name`, `author-link`, `author-avatar`,
1234                                                 `owner-name`, `owner-link`, `owner-avatar`
1235                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1236                                         intval($uid), dbesc($guid));
1237                         }
1238                 }
1239
1240                 if (!$r) {
1241                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
1242                         return false;
1243                 } else {
1244                         logger("parent item found: parent: ".$guid." - user: ".$uid);
1245                         return $r[0];
1246                 }
1247         }
1248
1249         /**
1250          * @brief returns contact details
1251          *
1252          * @param array $contact The default contact if the person isn't found
1253          * @param array $person The record of the person
1254          * @param int $uid The user id
1255          *
1256          * @return array
1257          *      'cid' => contact id
1258          *      'network' => network type
1259          */
1260         private static function author_contact_by_url($contact, $person, $uid) {
1261
1262                 $r = q("SELECT `id`, `network`, `url` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
1263                         dbesc(normalise_link($person["url"])), intval($uid));
1264                 if ($r) {
1265                         $cid = $r[0]["id"];
1266                         $network = $r[0]["network"];
1267
1268                         // We are receiving content from a user that possibly is about to be terminated
1269                         // This means the user is vital, so we remove a possible termination date.
1270                         unmark_for_death($r[0]);
1271                 } else {
1272                         $cid = $contact["id"];
1273                         $network = NETWORK_DIASPORA;
1274                 }
1275
1276                 return array("cid" => $cid, "network" => $network);
1277         }
1278
1279         /**
1280          * @brief Is the profile a hubzilla profile?
1281          *
1282          * @param string $url The profile link
1283          *
1284          * @return bool is it a hubzilla server?
1285          */
1286         public static function is_redmatrix($url) {
1287                 return(strstr($url, "/channel/"));
1288         }
1289
1290         /**
1291          * @brief Generate a post link with a given handle and message guid
1292          *
1293          * @param string $addr The user handle
1294          * @param string $guid message guid
1295          *
1296          * @return string the post link
1297          */
1298         private static function plink($addr, $guid, $parent_guid = '') {
1299                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
1300
1301                 // Fallback
1302                 if (!DBM::is_result($r)) {
1303                         if ($parent_guid != '') {
1304                                 return "https://".substr($addr,strpos($addr,"@") + 1)."/posts/".$parent_guid."#".$guid;
1305                         } else {
1306                                 return "https://".substr($addr,strpos($addr,"@") + 1)."/posts/".$guid;
1307                         }
1308                 }
1309
1310                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
1311                 // So we try another way as well.
1312                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
1313                 if (DBM::is_result($s)) {
1314                         $r[0]["network"] = $s[0]["network"];
1315                 }
1316
1317                 if ($r[0]["network"] == NETWORK_DFRN) {
1318                         return str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/");
1319                 }
1320
1321                 if (self::is_redmatrix($r[0]["url"])) {
1322                         return $r[0]["url"]."/?f=&mid=".$guid;
1323                 }
1324
1325                 if ($parent_guid != '') {
1326                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$parent_guid."#".$guid;
1327                 } else {
1328                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1329                 }
1330         }
1331
1332         /**
1333          * @brief Receives account migration
1334          *
1335          * @param array $importer Array of the importer user
1336          * @param object $data The message object
1337          *
1338          * @return bool Success
1339          */
1340         private static function receiveAccountMigration($importer, $data) {
1341                 $old_handle = notags(unxmlify($data->author));
1342                 $new_handle = notags(unxmlify($data->profile->author));
1343                 $signature = notags(unxmlify($data->signature));
1344
1345                 $contact = self::contact_by_handle($importer["uid"], $old_handle);
1346                 if (!$contact) {
1347                         logger("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1348                         return false;
1349                 }
1350
1351                 logger("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1352
1353                 // Check signature
1354                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1355                 $key = self::key($old_handle);
1356                 if (!rsa_verify($signed_text, $signature, $key, "sha256")) {
1357                         logger('No valid signature for migration.');
1358                         return false;
1359                 }
1360
1361                 // Update the profile
1362                 self::receive_profile($importer, $data->profile);
1363
1364                 // change the technical stuff in contact and gcontact
1365                 $data = Probe::uri($new_handle);
1366                 if ($data['network'] == NETWORK_PHANTOM) {
1367                         logger('Account for '.$new_handle." couldn't be probed.");
1368                         return false;
1369                 }
1370
1371                 $fields = array('url' => $data['url'], 'nurl' => normalise_link($data['url']),
1372                                 'name' => $data['name'], 'nick' => $data['nick'],
1373                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1374                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1375                                 'network' => $data['network']);
1376
1377                 dba::update('contact', $fields, array('addr' => $old_handle));
1378
1379                 $fields = array('url' => $data['url'], 'nurl' => normalise_link($data['url']),
1380                                 'name' => $data['name'], 'nick' => $data['nick'],
1381                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1382                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1383                                 'server_url' => $data['baseurl'], 'network' => $data['network']);
1384
1385                 dba::update('gcontact', $fields, array('addr' => $old_handle));
1386
1387                 logger('Contacts are updated.');
1388
1389                 // update items
1390                 /// @todo This is an extreme performance killer
1391                 $fields = array(
1392                         'owner-link' => array($contact["url"], $data["url"]),
1393                         'author-link' => array($contact["url"], $data["url"]),
1394                 );
1395                 foreach ($fields as $n=>$f) {
1396                         $r = q("SELECT `id` FROM `item` WHERE `%s` = '%s' AND `uid` = %d LIMIT 1",
1397                                         $n, dbesc($f[0]),
1398                                         intval($importer["uid"]));
1399
1400                         if (DBM::is_result($r)) {
1401                                 $x = q("UPDATE `item` SET `%s` = '%s' WHERE `%s` = '%s' AND `uid` = %d",
1402                                                 $n, dbesc($f[1]),
1403                                                 $n, dbesc($f[0]),
1404                                                 intval($importer["uid"]));
1405
1406                                 if ($x === false) {
1407                                         return false;
1408                                 }
1409                         }
1410                 }
1411
1412                 logger('Items are updated.');
1413
1414                 return true;
1415         }
1416
1417         /**
1418          * @brief Processes an account deletion
1419          *
1420          * @param array $importer Array of the importer user
1421          * @param object $data The message object
1422          *
1423          * @return bool Success
1424          */
1425         private static function receive_account_deletion($importer, $data) {
1426
1427                 /// @todo Account deletion should remove the contact from the global contacts as well
1428
1429                 $author = notags(unxmlify($data->author));
1430
1431                 $contact = self::contact_by_handle($importer["uid"], $author);
1432                 if (!$contact) {
1433                         logger("cannot find contact for author: ".$author);
1434                         return false;
1435                 }
1436
1437                 // We now remove the contact
1438                 contact_remove($contact["id"]);
1439                 return true;
1440         }
1441
1442         /**
1443          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1444          *
1445          * @param string $author Author handle
1446          * @param string $guid Message guid
1447          * @param boolean $onlyfound Only return uri when found in the database
1448          *
1449          * @return string The constructed uri or the one from our database
1450          */
1451         private static function get_uri_from_guid($author, $guid, $onlyfound = false) {
1452
1453                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1454                 if (DBM::is_result($r)) {
1455                         return $r[0]["uri"];
1456                 } elseif (!$onlyfound) {
1457                         return $author.":".$guid;
1458                 }
1459
1460                 return "";
1461         }
1462
1463         /**
1464          * @brief Fetch the guid from our database with a given uri
1465          *
1466          * @param string $author Author handle
1467          * @param string $uri Message uri
1468          *
1469          * @return string The post guid
1470          */
1471         private static function get_guid_from_uri($uri, $uid) {
1472
1473                 $r = q("SELECT `guid` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($uri), intval($uid));
1474                 if (DBM::is_result($r)) {
1475                         return $r[0]["guid"];
1476                 } else {
1477                         return false;
1478                 }
1479         }
1480
1481         /**
1482          * @brief Find the best importer for a comment, like, ...
1483          *
1484          * @param string $guid The guid of the item
1485          *
1486          * @return array|boolean the origin owner of that post - or false
1487          */
1488         private static function importer_for_guid($guid) {
1489                 $item = dba::fetch_first("SELECT `uid` FROM `item` WHERE `origin` AND `guid` = ? LIMIT 1", $guid);
1490
1491                 if (DBM::is_result($item)) {
1492                         logger("Found user ".$item['uid']." as owner of item ".$guid, LOGGER_DEBUG);
1493                         $contact = dba::fetch_first("SELECT * FROM `contact` WHERE `self` AND `uid` = ?", $item['uid']);
1494                         if (DBM::is_result($contact)) {
1495                                 return $contact;
1496                         }
1497                 }
1498                 return false;
1499         }
1500
1501         /**
1502          * @brief Processes an incoming comment
1503          *
1504          * @param array $importer Array of the importer user
1505          * @param string $sender The sender of the message
1506          * @param object $data The message object
1507          * @param string $xml The original XML of the message
1508          *
1509          * @return int The message id of the generated comment or "false" if there was an error
1510          */
1511         private static function receive_comment($importer, $sender, $data, $xml) {
1512                 $author = notags(unxmlify($data->author));
1513                 $guid = notags(unxmlify($data->guid));
1514                 $parent_guid = notags(unxmlify($data->parent_guid));
1515                 $text = unxmlify($data->text);
1516
1517                 if (isset($data->created_at)) {
1518                         $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1519                 } else {
1520                         $created_at = datetime_convert();
1521                 }
1522
1523                 if (isset($data->thread_parent_guid)) {
1524                         $thread_parent_guid = notags(unxmlify($data->thread_parent_guid));
1525                         $thr_uri = self::get_uri_from_guid("", $thread_parent_guid, true);
1526                 } else {
1527                         $thr_uri = "";
1528                 }
1529
1530                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1531                 if (!$contact) {
1532                         return false;
1533                 }
1534
1535                 $message_id = self::message_exists($importer["uid"], $guid);
1536                 if ($message_id) {
1537                         return true;
1538                 }
1539
1540                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1541                 if (!$parent_item) {
1542                         return false;
1543                 }
1544
1545                 $person = self::person_by_handle($author);
1546                 if (!is_array($person)) {
1547                         logger("unable to find author details");
1548                         return false;
1549                 }
1550
1551                 // Fetch the contact id - if we know this contact
1552                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1553
1554                 $datarray = array();
1555
1556                 $datarray["uid"] = $importer["uid"];
1557                 $datarray["contact-id"] = $author_contact["cid"];
1558                 $datarray["network"]  = $author_contact["network"];
1559
1560                 $datarray["author-name"] = $person["name"];
1561                 $datarray["author-link"] = $person["url"];
1562                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1563
1564                 $datarray["owner-name"] = $contact["name"];
1565                 $datarray["owner-link"] = $contact["url"];
1566                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1567
1568                 $datarray["guid"] = $guid;
1569                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1570
1571                 $datarray["type"] = "remote-comment";
1572                 $datarray["verb"] = ACTIVITY_POST;
1573                 $datarray["gravity"] = GRAVITY_COMMENT;
1574
1575                 if ($thr_uri != "") {
1576                         $datarray["parent-uri"] = $thr_uri;
1577                 } else {
1578                         $datarray["parent-uri"] = $parent_item["uri"];
1579                 }
1580
1581                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1582
1583                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1584                 $datarray["source"] = $xml;
1585
1586                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1587
1588                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1589
1590                 $body = diaspora2bb($text);
1591
1592                 $datarray["body"] = self::replace_people_guid($body, $person["url"]);
1593
1594                 self::fetch_guid($datarray);
1595
1596                 $message_id = item_store($datarray);
1597
1598                 if ($message_id <= 0) {
1599                         return false;
1600                 }
1601
1602                 if ($message_id) {
1603                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1604                 }
1605
1606                 // If we are the origin of the parent we store the original data and notify our followers
1607                 if ($message_id && $parent_item["origin"]) {
1608
1609                         // Formerly we stored the signed text, the signature and the author in different fields.
1610                         // We now store the raw data so that we are more flexible.
1611                         dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($data)));
1612
1613                         // notify others
1614                         Worker::add(PRIORITY_HIGH, "notifier", "comment-import", $message_id);
1615                 }
1616
1617                 return true;
1618         }
1619
1620         /**
1621          * @brief processes and stores private messages
1622          *
1623          * @param array $importer Array of the importer user
1624          * @param array $contact The contact of the message
1625          * @param object $data The message object
1626          * @param array $msg Array of the processed message, author handle and key
1627          * @param object $mesg The private message
1628          * @param array $conversation The conversation record to which this message belongs
1629          *
1630          * @return bool "true" if it was successful
1631          */
1632         private static function receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation) {
1633                 $author = notags(unxmlify($data->author));
1634                 $guid = notags(unxmlify($data->guid));
1635                 $subject = notags(unxmlify($data->subject));
1636
1637                 // "diaspora_handle" is the element name from the old version
1638                 // "author" is the element name from the new version
1639                 if ($mesg->author) {
1640                         $msg_author = notags(unxmlify($mesg->author));
1641                 } elseif ($mesg->diaspora_handle) {
1642                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1643                 } else {
1644                         return false;
1645                 }
1646
1647                 $msg_guid = notags(unxmlify($mesg->guid));
1648                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1649                 $msg_text = unxmlify($mesg->text);
1650                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1651
1652                 if ($msg_conversation_guid != $guid) {
1653                         logger("message conversation guid does not belong to the current conversation.");
1654                         return false;
1655                 }
1656
1657                 $body = diaspora2bb($msg_text);
1658                 $message_uri = $msg_author.":".$msg_guid;
1659
1660                 $person = self::person_by_handle($msg_author);
1661
1662                 dba::lock('mail');
1663
1664                 $r = q("SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1665                         dbesc($msg_guid),
1666                         intval($importer["uid"])
1667                 );
1668                 if (DBM::is_result($r)) {
1669                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1670                         return false;
1671                 }
1672
1673                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1674                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1675                         intval($importer["uid"]),
1676                         dbesc($msg_guid),
1677                         intval($conversation["id"]),
1678                         dbesc($person["name"]),
1679                         dbesc($person["photo"]),
1680                         dbesc($person["url"]),
1681                         intval($contact["id"]),
1682                         dbesc($subject),
1683                         dbesc($body),
1684                         0,
1685                         0,
1686                         dbesc($message_uri),
1687                         dbesc($author.":".$guid),
1688                         dbesc($msg_created_at)
1689                 );
1690
1691                 dba::unlock();
1692
1693                 dba::update('conv', array('updated' => datetime_convert()), array('id' => $conversation["id"]));
1694
1695                 notification(array(
1696                         "type" => NOTIFY_MAIL,
1697                         "notify_flags" => $importer["notify-flags"],
1698                         "language" => $importer["language"],
1699                         "to_name" => $importer["username"],
1700                         "to_email" => $importer["email"],
1701                         "uid" =>$importer["uid"],
1702                         "item" => array("subject" => $subject, "body" => $body),
1703                         "source_name" => $person["name"],
1704                         "source_link" => $person["url"],
1705                         "source_photo" => $person["thumb"],
1706                         "verb" => ACTIVITY_POST,
1707                         "otype" => "mail"
1708                 ));
1709                 return true;
1710         }
1711
1712         /**
1713          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1714          *
1715          * @param array $importer Array of the importer user
1716          * @param array $msg Array of the processed message, author handle and key
1717          * @param object $data The message object
1718          *
1719          * @return bool Success
1720          */
1721         private static function receive_conversation($importer, $msg, $data) {
1722                 $author = notags(unxmlify($data->author));
1723                 $guid = notags(unxmlify($data->guid));
1724                 $subject = notags(unxmlify($data->subject));
1725                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1726                 $participants = notags(unxmlify($data->participants));
1727
1728                 $messages = $data->message;
1729
1730                 if (!count($messages)) {
1731                         logger("empty conversation");
1732                         return false;
1733                 }
1734
1735                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1736                 if (!$contact)
1737                         return false;
1738
1739                 $conversation = null;
1740
1741                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1742                         intval($importer["uid"]),
1743                         dbesc($guid)
1744                 );
1745                 if ($c)
1746                         $conversation = $c[0];
1747                 else {
1748                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1749                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1750                                 intval($importer["uid"]),
1751                                 dbesc($guid),
1752                                 dbesc($author),
1753                                 dbesc($created_at),
1754                                 dbesc(datetime_convert()),
1755                                 dbesc($subject),
1756                                 dbesc($participants)
1757                         );
1758                         if ($r)
1759                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1760                                         intval($importer["uid"]),
1761                                         dbesc($guid)
1762                                 );
1763
1764                         if ($c)
1765                                 $conversation = $c[0];
1766                 }
1767                 if (!$conversation) {
1768                         logger("unable to create conversation.");
1769                         return false;
1770                 }
1771
1772                 foreach ($messages as $mesg)
1773                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation);
1774
1775                 return true;
1776         }
1777
1778         /**
1779          * @brief Creates the body for a "like" message
1780          *
1781          * @param array $contact The contact that send us the "like"
1782          * @param array $parent_item The item array of the parent item
1783          * @param string $guid message guid
1784          *
1785          * @return string the body
1786          */
1787         private static function construct_like_body($contact, $parent_item, $guid) {
1788                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1789
1790                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1791                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1792                 $plink = "[url=".System::baseUrl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1793
1794                 return sprintf($bodyverb, $ulink, $alink, $plink);
1795         }
1796
1797         /**
1798          * @brief Creates a XML object for a "like"
1799          *
1800          * @param array $importer Array of the importer user
1801          * @param array $parent_item The item array of the parent item
1802          *
1803          * @return string The XML
1804          */
1805         private static function construct_like_object($importer, $parent_item) {
1806                 $objtype = ACTIVITY_OBJ_NOTE;
1807                 $link = '<link rel="alternate" type="text/html" href="'.System::baseUrl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1808                 $parent_body = $parent_item["body"];
1809
1810                 $xmldata = array("object" => array("type" => $objtype,
1811                                                 "local" => "1",
1812                                                 "id" => $parent_item["uri"],
1813                                                 "link" => $link,
1814                                                 "title" => "",
1815                                                 "content" => $parent_body));
1816
1817                 return xml::from_array($xmldata, $xml, true);
1818         }
1819
1820         /**
1821          * @brief Processes "like" messages
1822          *
1823          * @param array $importer Array of the importer user
1824          * @param string $sender The sender of the message
1825          * @param object $data The message object
1826          *
1827          * @return int The message id of the generated like or "false" if there was an error
1828          */
1829         private static function receive_like($importer, $sender, $data) {
1830                 $author = notags(unxmlify($data->author));
1831                 $guid = notags(unxmlify($data->guid));
1832                 $parent_guid = notags(unxmlify($data->parent_guid));
1833                 $parent_type = notags(unxmlify($data->parent_type));
1834                 $positive = notags(unxmlify($data->positive));
1835
1836                 // likes on comments aren't supported by Diaspora - only on posts
1837                 // But maybe this will be supported in the future, so we will accept it.
1838                 if (!in_array($parent_type, array("Post", "Comment")))
1839                         return false;
1840
1841                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1842                 if (!$contact)
1843                         return false;
1844
1845                 $message_id = self::message_exists($importer["uid"], $guid);
1846                 if ($message_id)
1847                         return true;
1848
1849                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1850                 if (!$parent_item)
1851                         return false;
1852
1853                 $person = self::person_by_handle($author);
1854                 if (!is_array($person)) {
1855                         logger("unable to find author details");
1856                         return false;
1857                 }
1858
1859                 // Fetch the contact id - if we know this contact
1860                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1861
1862                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1863                 // We would accept this anyhow.
1864                 if ($positive == "true")
1865                         $verb = ACTIVITY_LIKE;
1866                 else
1867                         $verb = ACTIVITY_DISLIKE;
1868
1869                 $datarray = array();
1870
1871                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1872
1873                 $datarray["uid"] = $importer["uid"];
1874                 $datarray["contact-id"] = $author_contact["cid"];
1875                 $datarray["network"]  = $author_contact["network"];
1876
1877                 $datarray["author-name"] = $person["name"];
1878                 $datarray["author-link"] = $person["url"];
1879                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1880
1881                 $datarray["owner-name"] = $contact["name"];
1882                 $datarray["owner-link"] = $contact["url"];
1883                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1884
1885                 $datarray["guid"] = $guid;
1886                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1887
1888                 $datarray["type"] = "activity";
1889                 $datarray["verb"] = $verb;
1890                 $datarray["gravity"] = GRAVITY_LIKE;
1891                 $datarray["parent-uri"] = $parent_item["uri"];
1892
1893                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1894                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1895
1896                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1897
1898                 $message_id = item_store($datarray);
1899
1900                 if ($message_id <= 0) {
1901                         return false;
1902                 }
1903
1904                 if ($message_id) {
1905                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1906                 }
1907
1908                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
1909                 if ($parent_item["id"] != $parent_item["parent"]) {
1910                         $toplevel = dba::select('item', array('origin'), array('id' => $parent_item["parent"]), array('limit' => 1));
1911                         $origin = $toplevel["origin"];
1912                 } else {
1913                         $origin = $parent_item["origin"];
1914                 }
1915
1916                 // If we are the origin of the parent we store the original data and notify our followers
1917                 if ($message_id && $origin) {
1918
1919                         // Formerly we stored the signed text, the signature and the author in different fields.
1920                         // We now store the raw data so that we are more flexible.
1921                         dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($data)));
1922
1923                         // notify others
1924                         Worker::add(PRIORITY_HIGH, "notifier", "comment-import", $message_id);
1925                 }
1926
1927                 return true;
1928         }
1929
1930         /**
1931          * @brief Processes private messages
1932          *
1933          * @param array $importer Array of the importer user
1934          * @param object $data The message object
1935          *
1936          * @return bool Success?
1937          */
1938         private static function receive_message($importer, $data) {
1939                 $author = notags(unxmlify($data->author));
1940                 $guid = notags(unxmlify($data->guid));
1941                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1942                 $text = unxmlify($data->text);
1943                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1944
1945                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1946                 if (!$contact) {
1947                         return false;
1948                 }
1949
1950                 $conversation = null;
1951
1952                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1953                         intval($importer["uid"]),
1954                         dbesc($conversation_guid)
1955                 );
1956                 if ($c) {
1957                         $conversation = $c[0];
1958                 } else {
1959                         logger("conversation not available.");
1960                         return false;
1961                 }
1962
1963                 $message_uri = $author.":".$guid;
1964
1965                 $person = self::person_by_handle($author);
1966                 if (!$person) {
1967                         logger("unable to find author details");
1968                         return false;
1969                 }
1970
1971                 $body = diaspora2bb($text);
1972
1973                 $body = self::replace_people_guid($body, $person["url"]);
1974
1975                 dba::lock('mail');
1976
1977                 $r = q("SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1978                         dbesc($guid),
1979                         intval($importer["uid"])
1980                 );
1981                 if (DBM::is_result($r)) {
1982                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1983                         return false;
1984                 }
1985
1986                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1987                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1988                         intval($importer["uid"]),
1989                         dbesc($guid),
1990                         intval($conversation["id"]),
1991                         dbesc($person["name"]),
1992                         dbesc($person["photo"]),
1993                         dbesc($person["url"]),
1994                         intval($contact["id"]),
1995                         dbesc($conversation["subject"]),
1996                         dbesc($body),
1997                         0,
1998                         1,
1999                         dbesc($message_uri),
2000                         dbesc($author.":".$conversation["guid"]),
2001                         dbesc($created_at)
2002                 );
2003
2004                 dba::unlock();
2005
2006                 dba::update('conv', array('updated' => datetime_convert()), array('id' => $conversation["id"]));
2007                 return true;
2008         }
2009
2010         /**
2011          * @brief Processes participations - unsupported by now
2012          *
2013          * @param array $importer Array of the importer user
2014          * @param object $data The message object
2015          *
2016          * @return bool always true
2017          */
2018         private static function receive_participation($importer, $data) {
2019                 // I'm not sure if we can fully support this message type
2020                 return true;
2021         }
2022
2023         /**
2024          * @brief Processes photos - unneeded
2025          *
2026          * @param array $importer Array of the importer user
2027          * @param object $data The message object
2028          *
2029          * @return bool always true
2030          */
2031         private static function receive_photo($importer, $data) {
2032                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
2033                 return true;
2034         }
2035
2036         /**
2037          * @brief Processes poll participations - unssupported
2038          *
2039          * @param array $importer Array of the importer user
2040          * @param object $data The message object
2041          *
2042          * @return bool always true
2043          */
2044         private static function receive_poll_participation($importer, $data) {
2045                 // We don't support polls by now
2046                 return true;
2047         }
2048
2049         /**
2050          * @brief Processes incoming profile updates
2051          *
2052          * @param array $importer Array of the importer user
2053          * @param object $data The message object
2054          *
2055          * @return bool Success
2056          */
2057         private static function receive_profile($importer, $data) {
2058                 $author = strtolower(notags(unxmlify($data->author)));
2059
2060                 $contact = self::contact_by_handle($importer["uid"], $author);
2061                 if (!$contact)
2062                         return false;
2063
2064                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
2065                 $image_url = unxmlify($data->image_url);
2066                 $birthday = unxmlify($data->birthday);
2067                 $gender = unxmlify($data->gender);
2068                 $about = diaspora2bb(unxmlify($data->bio));
2069                 $location = diaspora2bb(unxmlify($data->location));
2070                 $searchable = (unxmlify($data->searchable) == "true");
2071                 $nsfw = (unxmlify($data->nsfw) == "true");
2072                 $tags = unxmlify($data->tag_string);
2073
2074                 $tags = explode("#", $tags);
2075
2076                 $keywords = array();
2077                 foreach ($tags as $tag) {
2078                         $tag = trim(strtolower($tag));
2079                         if ($tag != "")
2080                                 $keywords[] = $tag;
2081                 }
2082
2083                 $keywords = implode(", ", $keywords);
2084
2085                 $handle_parts = explode("@", $author);
2086                 $nick = $handle_parts[0];
2087
2088                 if ($name === "")
2089                         $name = $handle_parts[0];
2090
2091                 if ( preg_match("|^https?://|", $image_url) === 0)
2092                         $image_url = "http://".$handle_parts[1].$image_url;
2093
2094                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
2095
2096                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2097
2098                 $birthday = str_replace("1000", "1901", $birthday);
2099
2100                 if ($birthday != "")
2101                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
2102
2103                 // this is to prevent multiple birthday notifications in a single year
2104                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2105
2106                 if (substr($birthday,5) === substr($contact["bd"],5))
2107                         $birthday = $contact["bd"];
2108
2109                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
2110                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
2111                         dbesc($name),
2112                         dbesc($nick),
2113                         dbesc($author),
2114                         dbesc(datetime_convert()),
2115                         dbesc($birthday),
2116                         dbesc($location),
2117                         dbesc($about),
2118                         dbesc($keywords),
2119                         dbesc($gender),
2120                         intval($contact["id"]),
2121                         intval($importer["uid"])
2122                 );
2123
2124                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
2125                                         "photo" => $image_url, "name" => $name, "location" => $location,
2126                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2127                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2128                                         "hide" => !$searchable, "nsfw" => $nsfw);
2129
2130                 $gcid = update_gcontact($gcontact);
2131
2132                 link_gcontact($gcid, $importer["uid"], $contact["id"]);
2133
2134                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
2135
2136                 return true;
2137         }
2138
2139         /**
2140          * @brief Processes incoming friend requests
2141          *
2142          * @param array $importer Array of the importer user
2143          * @param array $contact The contact that send the request
2144          */
2145         private static function receive_request_make_friend($importer, $contact) {
2146
2147                 $a = get_app();
2148
2149                 if ($contact["rel"] == CONTACT_IS_SHARING) {
2150                         dba::update('contact', array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
2151                                         array('id' => $contact["id"], 'uid' => $importer["uid"]));
2152                 }
2153                 // send notification
2154
2155                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
2156                         intval($importer["uid"])
2157                 );
2158
2159                 if ($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(PConfig::get($importer["uid"], "system", "post_newfriend"))) {
2160
2161                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
2162                                 intval($importer["uid"])
2163                         );
2164
2165                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
2166
2167                         if ($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
2168
2169                                 $arr = array();
2170                                 $arr["protocol"] = PROTOCOL_DIASPORA;
2171                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
2172                                 $arr["uid"] = $importer["uid"];
2173                                 $arr["contact-id"] = $self[0]["id"];
2174                                 $arr["wall"] = 1;
2175                                 $arr["type"] = 'wall';
2176                                 $arr["gravity"] = 0;
2177                                 $arr["origin"] = 1;
2178                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
2179                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
2180                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
2181                                 $arr["verb"] = ACTIVITY_FRIEND;
2182                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
2183
2184                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
2185                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
2186                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
2187                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
2188
2189                                 $arr["object"] = self::construct_new_friend_object($contact);
2190
2191                                 $arr["last-child"] = 1;
2192
2193                                 $arr["allow_cid"] = $user[0]["allow_cid"];
2194                                 $arr["allow_gid"] = $user[0]["allow_gid"];
2195                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
2196                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
2197
2198                                 $i = item_store($arr);
2199                                 if ($i)
2200                                         Worker::add(PRIORITY_HIGH, "notifier", "activity", $i);
2201                         }
2202                 }
2203         }
2204
2205         /**
2206          * @brief Creates a XML object for a "new friend" message
2207          *
2208          * @param array $contact Array of the contact
2209          *
2210          * @return string The XML
2211          */
2212         private static function construct_new_friend_object($contact) {
2213                 $objtype = ACTIVITY_OBJ_PERSON;
2214                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
2215                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
2216
2217                 $xmldata = array("object" => array("type" => $objtype,
2218                                                 "title" => $contact["name"],
2219                                                 "id" => $contact["url"]."/".$contact["name"],
2220                                                 "link" => $link));
2221
2222                 return xml::from_array($xmldata, $xml, true);
2223         }
2224
2225         /**
2226          * @brief Processes incoming sharing notification
2227          *
2228          * @param array $importer Array of the importer user
2229          * @param object $data The message object
2230          *
2231          * @return bool Success
2232          */
2233         private static function receive_contact_request($importer, $data) {
2234                 $author = unxmlify($data->author);
2235                 $recipient = unxmlify($data->recipient);
2236
2237                 if (!$author || !$recipient) {
2238                         return false;
2239                 }
2240
2241                 // the current protocol version doesn't know these fields
2242                 // That means that we will assume their existance
2243                 if (isset($data->following)) {
2244                         $following = (unxmlify($data->following) == "true");
2245                 } else {
2246                         $following = true;
2247                 }
2248
2249                 if (isset($data->sharing)) {
2250                         $sharing = (unxmlify($data->sharing) == "true");
2251                 } else {
2252                         $sharing = true;
2253                 }
2254
2255                 $contact = self::contact_by_handle($importer["uid"],$author);
2256
2257                 // perhaps we were already sharing with this person. Now they're sharing with us.
2258                 // That makes us friends.
2259                 if ($contact) {
2260                         if ($following) {
2261                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", LOGGER_DEBUG);
2262                                 self::receive_request_make_friend($importer, $contact);
2263
2264                                 // refetch the contact array
2265                                 $contact = self::contact_by_handle($importer["uid"],$author);
2266
2267                                 // If we are now friends, we are sending a share message.
2268                                 // Normally we needn't to do so, but the first message could have been vanished.
2269                                 if (in_array($contact["rel"], array(CONTACT_IS_FRIEND))) {
2270                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2271                                         if ($u) {
2272                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2273                                                 $ret = self::send_share($u[0], $contact);
2274                                         }
2275                                 }
2276                                 return true;
2277                         } else {
2278                                 logger("Author ".$author." doesn't want to follow us anymore.", LOGGER_DEBUG);
2279                                 lose_follower($importer, $contact);
2280                                 return true;
2281                         }
2282                 }
2283
2284                 if (!$following && $sharing && in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
2285                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2286                         return false;
2287                 } elseif (!$following && !$sharing) {
2288                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2289                         return false;
2290                 } elseif (!$following && $sharing) {
2291                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2292                 } elseif ($following && $sharing) {
2293                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2294                 } elseif ($following && !$sharing) {
2295                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2296                 }
2297
2298                 $ret = self::person_by_handle($author);
2299
2300                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2301                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2302                         return false;
2303                 }
2304
2305                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2306
2307                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2308                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2309                         intval($importer["uid"]),
2310                         dbesc($ret["network"]),
2311                         dbesc($ret["addr"]),
2312                         datetime_convert(),
2313                         dbesc($ret["url"]),
2314                         dbesc(normalise_link($ret["url"])),
2315                         dbesc($batch),
2316                         dbesc($ret["name"]),
2317                         dbesc($ret["nick"]),
2318                         dbesc($ret["photo"]),
2319                         dbesc($ret["pubkey"]),
2320                         dbesc($ret["notify"]),
2321                         dbesc($ret["poll"]),
2322                         1,
2323                         2
2324                 );
2325
2326                 // find the contact record we just created
2327
2328                 $contact_record = self::contact_by_handle($importer["uid"],$author);
2329
2330                 if (!$contact_record) {
2331                         logger("unable to locate newly created contact record.");
2332                         return;
2333                 }
2334
2335                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2336
2337                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
2338
2339                 if (intval($def_gid))
2340                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
2341
2342                 update_contact_avatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2343
2344                 if ($importer["page-flags"] == PAGE_NORMAL) {
2345
2346                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2347
2348                         $hash = random_string().(string)time();   // Generate a confirm_key
2349
2350                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2351                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2352                                 intval($importer["uid"]),
2353                                 intval($contact_record["id"]),
2354                                 0,
2355                                 0,
2356                                 dbesc(t("Sharing notification from Diaspora network")),
2357                                 dbesc($hash),
2358                                 dbesc(datetime_convert())
2359                         );
2360                 } else {
2361
2362                         // automatic friend approval
2363
2364                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2365
2366                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
2367
2368                         // technically they are sharing with us (CONTACT_IS_SHARING),
2369                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2370                         // we are going to change the relationship and make them a follower.
2371
2372                         if (($importer["page-flags"] == PAGE_FREELOVE) && $sharing && $following)
2373                                 $new_relation = CONTACT_IS_FRIEND;
2374                         elseif (($importer["page-flags"] == PAGE_FREELOVE) && $sharing)
2375                                 $new_relation = CONTACT_IS_SHARING;
2376                         else
2377                                 $new_relation = CONTACT_IS_FOLLOWER;
2378
2379                         $r = q("UPDATE `contact` SET `rel` = %d,
2380                                 `name-date` = '%s',
2381                                 `uri-date` = '%s',
2382                                 `blocked` = 0,
2383                                 `pending` = 0,
2384                                 `writable` = 1
2385                                 WHERE `id` = %d
2386                                 ",
2387                                 intval($new_relation),
2388                                 dbesc(datetime_convert()),
2389                                 dbesc(datetime_convert()),
2390                                 intval($contact_record["id"])
2391                         );
2392
2393                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2394                         if ($u) {
2395                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2396                                 $ret = self::send_share($u[0], $contact_record);
2397
2398                                 // Send the profile data, maybe it weren't transmitted before
2399                                 self::send_profile($importer["uid"], array($contact_record));
2400                         }
2401                 }
2402
2403                 return true;
2404         }
2405
2406         /**
2407          * @brief Fetches a message with a given guid
2408          *
2409          * @param string $guid message guid
2410          * @param string $orig_author handle of the original post
2411          * @param string $author handle of the sharer
2412          *
2413          * @return array The fetched item
2414          */
2415         private static function original_item($guid, $orig_author, $author) {
2416
2417                 // Do we already have this item?
2418                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2419                                 `author-name`, `author-link`, `author-avatar`
2420                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2421                         dbesc($guid));
2422
2423                 if (DBM::is_result($r)) {
2424                         logger("reshared message ".$guid." already exists on system.");
2425
2426                         // Maybe it is already a reshared item?
2427                         // Then refetch the content, if it is a reshare from a reshare.
2428                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2429                         if (self::is_reshare($r[0]["body"], true)) {
2430                                 $r = array();
2431                         } elseif (self::is_reshare($r[0]["body"], false) || strstr($r[0]["body"], "[share")) {
2432                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2433
2434                                 $r[0]["body"] = self::replace_people_guid($r[0]["body"], $r[0]["author-link"]);
2435
2436                                 // Add OEmbed and other information to the body
2437                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
2438
2439                                 return $r[0];
2440                         } else {
2441                                 return $r[0];
2442                         }
2443                 }
2444
2445                 if (!DBM::is_result($r)) {
2446                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2447                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2448                         $item_id = self::store_by_guid($guid, $server);
2449
2450                         if (!$item_id) {
2451                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2452                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
2453                                 $item_id = self::store_by_guid($guid, $server);
2454                         }
2455
2456                         if ($item_id) {
2457                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2458                                                 `author-name`, `author-link`, `author-avatar`
2459                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2460                                         intval($item_id));
2461
2462                                 if (DBM::is_result($r)) {
2463                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2464                                         if (self::is_reshare($r[0]["body"], false)) {
2465                                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2466                                                 $r[0]["body"] = self::replace_people_guid($r[0]["body"], $r[0]["author-link"]);
2467                                         }
2468
2469                                         return $r[0];
2470                                 }
2471
2472                         }
2473                 }
2474                 return false;
2475         }
2476
2477         /**
2478          * @brief Processes a reshare message
2479          *
2480          * @param array $importer Array of the importer user
2481          * @param object $data The message object
2482          * @param string $xml The original XML of the message
2483          *
2484          * @return int the message id
2485          */
2486         private static function receive_reshare($importer, $data, $xml) {
2487                 $author = notags(unxmlify($data->author));
2488                 $guid = notags(unxmlify($data->guid));
2489                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2490                 $root_author = notags(unxmlify($data->root_author));
2491                 $root_guid = notags(unxmlify($data->root_guid));
2492                 /// @todo handle unprocessed property "provider_display_name"
2493                 $public = notags(unxmlify($data->public));
2494
2495                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2496                 if (!$contact) {
2497                         return false;
2498                 }
2499
2500                 $message_id = self::message_exists($importer["uid"], $guid);
2501                 if ($message_id) {
2502                         return true;
2503                 }
2504
2505                 $original_item = self::original_item($root_guid, $root_author, $author);
2506                 if (!$original_item) {
2507                         return false;
2508                 }
2509
2510                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2511
2512                 $datarray = array();
2513
2514                 $datarray["uid"] = $importer["uid"];
2515                 $datarray["contact-id"] = $contact["id"];
2516                 $datarray["network"]  = NETWORK_DIASPORA;
2517
2518                 $datarray["author-name"] = $contact["name"];
2519                 $datarray["author-link"] = $contact["url"];
2520                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2521
2522                 $datarray["owner-name"] = $datarray["author-name"];
2523                 $datarray["owner-link"] = $datarray["author-link"];
2524                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2525
2526                 $datarray["guid"] = $guid;
2527                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2528
2529                 $datarray["verb"] = ACTIVITY_POST;
2530                 $datarray["gravity"] = GRAVITY_PARENT;
2531
2532                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2533                 $datarray["source"] = $xml;
2534
2535                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
2536                                         $original_item["guid"], $original_item["created"], $orig_url);
2537                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2538
2539                 $datarray["tag"] = $original_item["tag"];
2540                 $datarray["app"]  = $original_item["app"];
2541
2542                 $datarray["plink"] = self::plink($author, $guid);
2543                 $datarray["private"] = (($public == "false") ? 1 : 0);
2544                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2545
2546                 $datarray["object-type"] = $original_item["object-type"];
2547
2548                 self::fetch_guid($datarray);
2549                 $message_id = item_store($datarray);
2550
2551                 if ($message_id) {
2552                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2553                         return true;
2554                 } else {
2555                         return false;
2556                 }
2557         }
2558
2559         /**
2560          * @brief Processes retractions
2561          *
2562          * @param array $importer Array of the importer user
2563          * @param array $contact The contact of the item owner
2564          * @param object $data The message object
2565          *
2566          * @return bool success
2567          */
2568         private static function item_retraction($importer, $contact, $data) {
2569                 $author = notags(unxmlify($data->author));
2570                 $target_guid = notags(unxmlify($data->target_guid));
2571                 $target_type = notags(unxmlify($data->target_type));
2572
2573                 $person = self::person_by_handle($author);
2574                 if (!is_array($person)) {
2575                         logger("unable to find author detail for ".$author);
2576                         return false;
2577                 }
2578
2579                 if (empty($contact["url"])) {
2580                         $contact["url"] = $person["url"];
2581                 }
2582
2583                 // Fetch items that are about to be deleted
2584                 $fields = array('uid', 'id', 'parent', 'parent-uri', 'author-link');
2585
2586                 // When we receive a public retraction, we delete every item that we find.
2587                 if ($importer['uid'] == 0) {
2588                         $condition = array("`guid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid);
2589                 } else {
2590                         $condition = array("`guid` = ? AND `uid` = ? AND NOT `file` LIKE '%%[%%' AND NOT `deleted`", $target_guid, $importer['uid']);
2591                 }
2592                 $r = dba::select('item', $fields, $condition);
2593                 if (!DBM::is_result($r)) {
2594                         logger("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2595                         return false;
2596                 }
2597
2598                 while ($item = dba::fetch($r)) {
2599                         // Fetch the parent item
2600                         $parent = dba::select('item', array('author-link', 'origin'), array('id' => $item["parent"]), array('limit' => 1));
2601
2602                         // Only delete it if the parent author really fits
2603                         if (!link_compare($parent["author-link"], $contact["url"]) && !link_compare($item["author-link"], $contact["url"])) {
2604                                 logger("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2605                                 continue;
2606                         }
2607
2608                         // Currently we don't have a central deletion function that we could use in this case. The function "item_drop" doesn't work for that case
2609                         dba::update('item', array('deleted' => true, 'title' => '', 'body' => '',
2610                                                 'edited' => datetime_convert(), 'changed' => datetime_convert()),
2611                                         array('id' => $item["id"]));
2612
2613                         // Delete the thread - if it is a starting post and not a comment
2614                         if ($target_type != 'Comment') {
2615                                 delete_thread($item["id"], $item["parent-uri"]);
2616                         }
2617
2618                         logger("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], LOGGER_DEBUG);
2619
2620                         // Now check if the retraction needs to be relayed by us
2621                         if ($parent["origin"]) {
2622                                 // notify others
2623                                 Worker::add(PRIORITY_HIGH, "notifier", "drop", $item["id"]);
2624                         }
2625                 }
2626
2627                 return true;
2628         }
2629
2630         /**
2631          * @brief Receives retraction messages
2632          *
2633          * @param array $importer Array of the importer user
2634          * @param string $sender The sender of the message
2635          * @param object $data The message object
2636          *
2637          * @return bool Success
2638          */
2639         private static function receive_retraction($importer, $sender, $data) {
2640                 $target_type = notags(unxmlify($data->target_type));
2641
2642                 $contact = self::contact_by_handle($importer["uid"], $sender);
2643                 if (!$contact && (in_array($target_type, array("Contact", "Person")))) {
2644                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2645                         return false;
2646                 }
2647
2648                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2649
2650                 switch ($target_type) {
2651                         case "Comment":
2652                         case "Like":
2653                         case "Post":
2654                         case "Reshare":
2655                         case "StatusMessage":
2656                                 return self::item_retraction($importer, $contact, $data);
2657
2658                         case "Contact":
2659                         case "Person":
2660                                 /// @todo What should we do with an "unshare"?
2661                                 // Removing the contact isn't correct since we still can read the public items
2662                                 contact_remove($contact["id"]);
2663                                 return true;
2664
2665                         default:
2666                                 logger("Unknown target type ".$target_type);
2667                                 return false;
2668                 }
2669                 return true;
2670         }
2671
2672         /**
2673          * @brief Receives status messages
2674          *
2675          * @param array $importer Array of the importer user
2676          * @param object $data The message object
2677          * @param string $xml The original XML of the message
2678          *
2679          * @return int The message id of the newly created item
2680          */
2681         private static function receive_status_message($importer, $data, $xml) {
2682                 $author = notags(unxmlify($data->author));
2683                 $guid = notags(unxmlify($data->guid));
2684                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2685                 $public = notags(unxmlify($data->public));
2686                 $text = unxmlify($data->text);
2687                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2688
2689                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2690                 if (!$contact) {
2691                         return false;
2692                 }
2693
2694                 $message_id = self::message_exists($importer["uid"], $guid);
2695                 if ($message_id) {
2696                         return true;
2697                 }
2698
2699                 $address = array();
2700                 if ($data->location) {
2701                         foreach ($data->location->children() AS $fieldname => $data) {
2702                                 $address[$fieldname] = notags(unxmlify($data));
2703                         }
2704                 }
2705
2706                 $body = diaspora2bb($text);
2707
2708                 $datarray = array();
2709
2710                 // Attach embedded pictures to the body
2711                 if ($data->photo) {
2712                         foreach ($data->photo AS $photo) {
2713                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2714                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2715                         }
2716
2717                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2718                 } else {
2719                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2720
2721                         // Add OEmbed and other information to the body
2722                         if (!self::is_redmatrix($contact["url"])) {
2723                                 $body = add_page_info_to_body($body, false, true);
2724                         }
2725                 }
2726
2727                 /// @todo enable support for polls
2728                 //if ($data->poll) {
2729                 //      foreach ($data->poll AS $poll)
2730                 //              print_r($poll);
2731                 //      die("poll!\n");
2732                 //}
2733
2734                 /// @todo enable support for events
2735
2736                 $datarray["uid"] = $importer["uid"];
2737                 $datarray["contact-id"] = $contact["id"];
2738                 $datarray["network"] = NETWORK_DIASPORA;
2739
2740                 $datarray["author-name"] = $contact["name"];
2741                 $datarray["author-link"] = $contact["url"];
2742                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2743
2744                 $datarray["owner-name"] = $datarray["author-name"];
2745                 $datarray["owner-link"] = $datarray["author-link"];
2746                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2747
2748                 $datarray["guid"] = $guid;
2749                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2750
2751                 $datarray["verb"] = ACTIVITY_POST;
2752                 $datarray["gravity"] = GRAVITY_PARENT;
2753
2754                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2755                 $datarray["source"] = $xml;
2756
2757                 $datarray["body"] = self::replace_people_guid($body, $contact["url"]);
2758
2759                 if ($provider_display_name != "") {
2760                         $datarray["app"] = $provider_display_name;
2761                 }
2762
2763                 $datarray["plink"] = self::plink($author, $guid);
2764                 $datarray["private"] = (($public == "false") ? 1 : 0);
2765                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2766
2767                 if (isset($address["address"])) {
2768                         $datarray["location"] = $address["address"];
2769                 }
2770
2771                 if (isset($address["lat"]) && isset($address["lng"])) {
2772                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2773                 }
2774
2775                 self::fetch_guid($datarray);
2776                 $message_id = item_store($datarray);
2777
2778                 if ($message_id) {
2779                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2780                         return true;
2781                 } else {
2782                         return false;
2783                 }
2784         }
2785
2786         /* ************************************************************************************** *
2787          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2788          * ************************************************************************************** */
2789
2790         /**
2791          * @brief returnes the handle of a contact
2792          *
2793          * @param array $me contact array
2794          *
2795          * @return string the handle in the format user@domain.tld
2796          */
2797         private static function my_handle($contact) {
2798                 if ($contact["addr"] != "") {
2799                         return $contact["addr"];
2800                 }
2801
2802                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2803                 // So - just in case - we build the the address here.
2804                 if ($contact["nickname"] != "") {
2805                         $nick = $contact["nickname"];
2806                 } else {
2807                         $nick = $contact["nick"];
2808                 }
2809
2810                 return $nick."@".substr(System::baseUrl(), strpos(System::baseUrl(),"://") + 3);
2811         }
2812
2813
2814         /**
2815          * @brief Creates the data for a private message in the new format
2816          *
2817          * @param string $msg The message that is to be transmitted
2818          * @param array $user The record of the sender
2819          * @param array $contact Target of the communication
2820          * @param string $prvkey The private key of the sender
2821          * @param string $pubkey The public key of the receiver
2822          *
2823          * @return string The encrypted data
2824          */
2825         public static function encode_private_data($msg, $user, $contact, $prvkey, $pubkey) {
2826
2827                 logger("Message: ".$msg, LOGGER_DATA);
2828
2829                 // without a public key nothing will work
2830                 if (!$pubkey) {
2831                         logger("pubkey missing: contact id: ".$contact["id"]);
2832                         return false;
2833                 }
2834
2835                 $aes_key = openssl_random_pseudo_bytes(32);
2836                 $b_aes_key = base64_encode($aes_key);
2837                 $iv = openssl_random_pseudo_bytes(16);
2838                 $b_iv = base64_encode($iv);
2839
2840                 $ciphertext = self::aes_encrypt($aes_key, $iv, $msg);
2841
2842                 $json = json_encode(array("iv" => $b_iv, "key" => $b_aes_key));
2843
2844                 $encrypted_key_bundle = "";
2845                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
2846
2847                 $json_object = json_encode(array("aes_key" => base64_encode($encrypted_key_bundle),
2848                                                 "encrypted_magic_envelope" => base64_encode($ciphertext)));
2849
2850                 return $json_object;
2851         }
2852
2853         /**
2854          * @brief Creates the envelope for the "fetch" endpoint and for the new format
2855          *
2856          * @param string $msg The message that is to be transmitted
2857          * @param array $user The record of the sender
2858          *
2859          * @return string The envelope
2860          */
2861         public static function build_magic_envelope($msg, $user) {
2862
2863                 $b64url_data = base64url_encode($msg);
2864                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2865
2866                 $key_id = base64url_encode(self::my_handle($user));
2867                 $type = "application/xml";
2868                 $encoding = "base64url";
2869                 $alg = "RSA-SHA256";
2870                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2871
2872                 // Fallback if the private key wasn't transmitted in the expected field
2873                 if ($user['uprvkey'] == "")
2874                         $user['uprvkey'] = $user['prvkey'];
2875
2876                 $signature = rsa_sign($signable_data, $user["uprvkey"]);
2877                 $sig = base64url_encode($signature);
2878
2879                 $xmldata = array("me:env" => array("me:data" => $data,
2880                                                         "@attributes" => array("type" => $type),
2881                                                         "me:encoding" => $encoding,
2882                                                         "me:alg" => $alg,
2883                                                         "me:sig" => $sig,
2884                                                         "@attributes2" => array("key_id" => $key_id)));
2885
2886                 $namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
2887
2888                 return xml::from_array($xmldata, $xml, false, $namespaces);
2889         }
2890
2891         /**
2892          * @brief Create the envelope for a message
2893          *
2894          * @param string $msg The message that is to be transmitted
2895          * @param array $user The record of the sender
2896          * @param array $contact Target of the communication
2897          * @param string $prvkey The private key of the sender
2898          * @param string $pubkey The public key of the receiver
2899          * @param bool $public Is the message public?
2900          *
2901          * @return string The message that will be transmitted to other servers
2902          */
2903         private static function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
2904
2905                 // The message is put into an envelope with the sender's signature
2906                 $envelope = self::build_magic_envelope($msg, $user);
2907
2908                 // Private messages are put into a second envelope, encrypted with the receivers public key
2909                 if (!$public) {
2910                         $envelope = self::encode_private_data($envelope, $user, $contact, $prvkey, $pubkey);
2911                 }
2912
2913                 return $envelope;
2914         }
2915
2916         /**
2917          * @brief Creates a signature for a message
2918          *
2919          * @param array $owner the array of the owner of the message
2920          * @param array $message The message that is to be signed
2921          *
2922          * @return string The signature
2923          */
2924         private static function signature($owner, $message) {
2925                 $sigmsg = $message;
2926                 unset($sigmsg["author_signature"]);
2927                 unset($sigmsg["parent_author_signature"]);
2928
2929                 $signed_text = implode(";", $sigmsg);
2930
2931                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2932         }
2933
2934         /**
2935          * @brief Transmit a message to a target server
2936          *
2937          * @param array $owner the array of the item owner
2938          * @param array $contact Target of the communication
2939          * @param string $envelope The message that is to be transmitted
2940          * @param bool $public_batch Is it a public post?
2941          * @param bool $queue_run Is the transmission called from the queue?
2942          * @param string $guid message guid
2943          *
2944          * @return int Result of the transmission
2945          */
2946         public static function transmit($owner, $contact, $envelope, $public_batch, $queue_run=false, $guid = "") {
2947
2948                 $a = get_app();
2949
2950                 $enabled = intval(Config::get("system", "diaspora_enabled"));
2951                 if (!$enabled)
2952                         return 200;
2953
2954                 $logid = random_string(4);
2955                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2956                 if (!$dest_url) {
2957                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2958                         return 0;
2959                 }
2960
2961                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2962
2963                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2964                         $return_code = 0;
2965                 } else {
2966                         if (!intval(Config::get("system", "diaspora_test"))) {
2967                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
2968
2969                                 post_url($dest_url."/", $envelope, array("Content-Type: ".$content_type));
2970                                 $return_code = $a->get_curl_code();
2971                         } else {
2972                                 logger("test_mode");
2973                                 return 200;
2974                         }
2975                 }
2976
2977                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2978
2979                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2980                         logger("queue message");
2981
2982                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2983                                 intval($contact["id"]),
2984                                 dbesc(NETWORK_DIASPORA),
2985                                 dbesc($envelope),
2986                                 intval($public_batch)
2987                         );
2988                         if ($r) {
2989                                 logger("add_to_queue ignored - identical item already in queue");
2990                         } else {
2991                                 // queue message for redelivery
2992                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch);
2993
2994                                 // The message could not be delivered. We mark the contact as "dead"
2995                                 mark_for_death($contact);
2996                         }
2997                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
2998                         // We successfully delivered a message, the contact is alive
2999                         unmark_for_death($contact);
3000                 }
3001
3002                 return(($return_code) ? $return_code : (-1));
3003         }
3004
3005
3006         /**
3007          * @brief Build the post xml
3008          *
3009          * @param string $type The message type
3010          * @param array $message The message data
3011          *
3012          * @return string The post XML
3013          */
3014         public static function build_post_xml($type, $message) {
3015
3016                 $data = array($type => $message);
3017
3018                 return xml::from_array($data, $xml);
3019         }
3020
3021         /**
3022          * @brief Builds and transmit messages
3023          *
3024          * @param array $owner the array of the item owner
3025          * @param array $contact Target of the communication
3026          * @param string $type The message type
3027          * @param array $message The message data
3028          * @param bool $public_batch Is it a public post?
3029          * @param string $guid message guid
3030          * @param bool $spool Should the transmission be spooled or transmitted?
3031          *
3032          * @return int Result of the transmission
3033          */
3034         private static function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false) {
3035
3036                 $msg = self::build_post_xml($type, $message);
3037
3038                 logger('message: '.$msg, LOGGER_DATA);
3039                 logger('send guid '.$guid, LOGGER_DEBUG);
3040
3041                 // Fallback if the private key wasn't transmitted in the expected field
3042                 if ($owner['uprvkey'] == "")
3043                         $owner['uprvkey'] = $owner['prvkey'];
3044
3045                 $envelope = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3046
3047                 if ($spool) {
3048                         add_to_queue($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch);
3049                         return true;
3050                 } else
3051                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
3052
3053                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
3054
3055                 return $return_code;
3056         }
3057
3058         /**
3059          * @brief sends an account migration
3060          *
3061          * @param array $owner the array of the item owner
3062          * @param array $contact Target of the communication
3063          * @param int $uid User ID
3064          *
3065          * @return int The result of the transmission
3066          */
3067         public static function sendAccountMigration($owner, $contact, $uid) {
3068
3069                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3070                 $profile = self::createProfileData($uid);
3071
3072                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3073                 $signature = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
3074
3075                 $message = array("author" => $old_handle,
3076                                 "profile" => $profile,
3077                                 "signature" => $signature);
3078
3079                 logger("Send account migration ".print_r($message, true), LOGGER_DEBUG);
3080
3081                 return self::build_and_transmit($owner, $contact, "account_migration", $message);
3082         }
3083
3084         /**
3085          * @brief Sends a "share" message
3086          *
3087          * @param array $owner the array of the item owner
3088          * @param array $contact Target of the communication
3089          *
3090          * @return int The result of the transmission
3091          */
3092         public static function send_share($owner, $contact) {
3093
3094                 /**
3095                  * @todo support the different possible combinations of "following" and "sharing"
3096                  * Currently, Diaspora only interprets the "sharing" field
3097                  *
3098                  * Before switching this code productive, we have to check all "send_share" calls if "rel" is set correctly
3099                  */
3100
3101                 /*
3102                 switch ($contact["rel"]) {
3103                         case CONTACT_IS_FRIEND:
3104                                 $following = true;
3105                                 $sharing = true;
3106                         case CONTACT_IS_SHARING:
3107                                 $following = false;
3108                                 $sharing = true;
3109                         case CONTACT_IS_FOLLOWER:
3110                                 $following = true;
3111                                 $sharing = false;
3112                 }
3113                 */
3114
3115                 $message = array("author" => self::my_handle($owner),
3116                                 "recipient" => $contact["addr"],
3117                                 "following" => "true",
3118                                 "sharing" => "true");
3119
3120                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
3121
3122                 return self::build_and_transmit($owner, $contact, "contact", $message);
3123         }
3124
3125         /**
3126          * @brief sends an "unshare"
3127          *
3128          * @param array $owner the array of the item owner
3129          * @param array $contact Target of the communication
3130          *
3131          * @return int The result of the transmission
3132          */
3133         public static function send_unshare($owner, $contact) {
3134
3135                 $message = array("author" => self::my_handle($owner),
3136                                 "recipient" => $contact["addr"],
3137                                 "following" => "false",
3138                                 "sharing" => "false");
3139
3140                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
3141
3142                 return self::build_and_transmit($owner, $contact, "contact", $message);
3143         }
3144
3145         /**
3146          * @brief Checks a message body if it is a reshare
3147          *
3148          * @param string $body The message body that is to be check
3149          * @param bool $complete Should it be a complete check or a simple check?
3150          *
3151          * @return array|bool Reshare details or "false" if no reshare
3152          */
3153         public static function is_reshare($body, $complete = true) {
3154                 $body = trim($body);
3155
3156                 // Skip if it isn't a pure repeated messages
3157                 // Does it start with a share?
3158                 if ((strpos($body, "[share") > 0) && $complete)
3159                         return(false);
3160
3161                 // Does it end with a share?
3162                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
3163                         return(false);
3164
3165                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
3166                 // Skip if there is no shared message in there
3167                 if ($body == $attributes)
3168                         return(false);
3169
3170                 // If we don't do the complete check we quit here
3171                 if (!$complete)
3172                         return true;
3173
3174                 $guid = "";
3175                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3176                 if ($matches[1] != "")
3177                         $guid = $matches[1];
3178
3179                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3180                 if ($matches[1] != "")
3181                         $guid = $matches[1];
3182
3183                 if ($guid != "") {
3184                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
3185                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
3186                         if ($r) {
3187                                 $ret= array();
3188                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
3189                                 $ret["root_guid"] = $guid;
3190                                 return($ret);
3191                         }
3192                 }
3193
3194                 $profile = "";
3195                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3196                 if ($matches[1] != "")
3197                         $profile = $matches[1];
3198
3199                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3200                 if ($matches[1] != "")
3201                         $profile = $matches[1];
3202
3203                 $ret= array();
3204
3205                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
3206                 if (($ret["root_handle"] == $profile) || ($ret["root_handle"] == ""))
3207                         return(false);
3208
3209                 $link = "";
3210                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
3211                 if ($matches[1] != "")
3212                         $link = $matches[1];
3213
3214                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
3215                 if ($matches[1] != "")
3216                         $link = $matches[1];
3217
3218                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
3219                 if (($ret["root_guid"] == $link) || (trim($ret["root_guid"]) == ""))
3220                         return(false);
3221
3222                 return($ret);
3223         }
3224
3225         /**
3226          * @brief Create an event array
3227          *
3228          * @param integer $event_id The id of the event
3229          *
3230          * @return array with event data
3231          */
3232         private static function build_event($event_id) {
3233
3234                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3235                 if (!DBM::is_result($r)) {
3236                         return array();
3237                 }
3238
3239                 $event = $r[0];
3240
3241                 $eventdata = array();
3242
3243                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3244                 if (!DBM::is_result($r)) {
3245                         return array();
3246                 }
3247
3248                 $user = $r[0];
3249
3250                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3251                 if (!DBM::is_result($r)) {
3252                         return array();
3253                 }
3254
3255                 $owner = $r[0];
3256
3257                 $eventdata['author'] = self::my_handle($owner);
3258
3259                 if ($event['guid']) {
3260                         $eventdata['guid'] = $event['guid'];
3261                 }
3262
3263                 $mask = 'Y-m-d\TH:i:s\Z';
3264
3265                 /// @todo - establish "all day" events in Friendica
3266                 $eventdata["all_day"] = "false";
3267
3268                 if (!$event['adjust']) {
3269                         $eventdata['timezone'] = $user['timezone'];
3270
3271                         if ($eventdata['timezone'] == "") {
3272                                 $eventdata['timezone'] = 'UTC';
3273                         }
3274                 }
3275
3276                 if ($event['start']) {
3277                         $eventdata['start'] = datetime_convert($eventdata['timezone'], "UTC", $event['start'], $mask);
3278                 }
3279                 if ($event['finish'] && !$event['nofinish']) {
3280                         $eventdata['end'] = datetime_convert($eventdata['timezone'], "UTC", $event['finish'], $mask);
3281                 }
3282                 if ($event['summary']) {
3283                         $eventdata['summary'] = html_entity_decode(bb2diaspora($event['summary']));
3284                 }
3285                 if ($event['desc']) {
3286                         $eventdata['description'] = html_entity_decode(bb2diaspora($event['desc']));
3287                 }
3288                 if ($event['location']) {
3289                         $location = array();
3290                         $location["address"] = html_entity_decode(bb2diaspora($event['location']));
3291                         $location["lat"] = 0;
3292                         $location["lng"] = 0;
3293                         $eventdata['location'] = $location;
3294                 }
3295
3296                 return $eventdata;
3297         }
3298
3299         /**
3300          * @brief Create a post (status message or reshare)
3301          *
3302          * @param array $item The item that will be exported
3303          * @param array $owner the array of the item owner
3304          *
3305          * @return array
3306          * 'type' -> Message type ("status_message" or "reshare")
3307          * 'message' -> Array of XML elements of the status
3308          */
3309         public static function build_status($item, $owner) {
3310
3311                 $cachekey = "diaspora:build_status:".$item['guid'];
3312
3313                 $result = Cache::get($cachekey);
3314                 if (!is_null($result)) {
3315                         return $result;
3316                 }
3317
3318                 $myaddr = self::my_handle($owner);
3319
3320                 $public = (($item["private"]) ? "false" : "true");
3321
3322                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3323
3324                 // Detect a share element and do a reshare
3325                 if (!$item['private'] && ($ret = self::is_reshare($item["body"]))) {
3326                         $message = array("author" => $myaddr,
3327                                         "guid" => $item["guid"],
3328                                         "created_at" => $created,
3329                                         "root_author" => $ret["root_handle"],
3330                                         "root_guid" => $ret["root_guid"],
3331                                         "provider_display_name" => $item["app"],
3332                                         "public" => $public);
3333
3334                         $type = "reshare";
3335                 } else {
3336                         $title = $item["title"];
3337                         $body = $item["body"];
3338
3339                         // convert to markdown
3340                         $body = html_entity_decode(bb2diaspora($body));
3341
3342                         // Adding the title
3343                         if (strlen($title))
3344                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3345
3346                         if ($item["attach"]) {
3347                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3348                                 if (cnt) {
3349                                         $body .= "\n".t("Attachments:")."\n";
3350                                         foreach ($matches as $mtch)
3351                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3352                                 }
3353                         }
3354
3355                         $location = array();
3356
3357                         if ($item["location"] != "")
3358                                 $location["address"] = $item["location"];
3359
3360                         if ($item["coord"] != "") {
3361                                 $coord = explode(" ", $item["coord"]);
3362                                 $location["lat"] = $coord[0];
3363                                 $location["lng"] = $coord[1];
3364                         }
3365
3366                         $message = array("author" => $myaddr,
3367                                         "guid" => $item["guid"],
3368                                         "created_at" => $created,
3369                                         "public" => $public,
3370                                         "text" => $body,
3371                                         "provider_display_name" => $item["app"],
3372                                         "location" => $location);
3373
3374                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3375                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3376                                 unset($message["location"]);
3377                         }
3378
3379                         if ($item['event-id'] > 0) {
3380                                 $event = self::build_event($item['event-id']);
3381                                 if (count($event)) {
3382                                         $message['event'] = $event;
3383
3384                                         /// @todo Once Diaspora supports it, we will remove the body
3385                                         // $message['text'] = '';
3386                                 }
3387                         }
3388
3389                         $type = "status_message";
3390                 }
3391
3392                 $msg = array("type" => $type, "message" => $message);
3393
3394                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3395
3396                 return $msg;
3397         }
3398
3399         /**
3400          * @brief Sends a post
3401          *
3402          * @param array $item The item that will be exported
3403          * @param array $owner the array of the item owner
3404          * @param array $contact Target of the communication
3405          * @param bool $public_batch Is it a public post?
3406          *
3407          * @return int The result of the transmission
3408          */
3409         public static function send_status($item, $owner, $contact, $public_batch = false) {
3410
3411                 $status = self::build_status($item, $owner);
3412
3413                 return self::build_and_transmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3414         }
3415
3416         /**
3417          * @brief Creates a "like" object
3418          *
3419          * @param array $item The item that will be exported
3420          * @param array $owner the array of the item owner
3421          *
3422          * @return array The data for a "like"
3423          */
3424         private static function construct_like($item, $owner) {
3425
3426                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3427                         dbesc($item["thr-parent"]));
3428                 if (!DBM::is_result($p))
3429                         return false;
3430
3431                 $parent = $p[0];
3432
3433                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3434                 if ($item['verb'] === ACTIVITY_LIKE) {
3435                         $positive = "true";
3436                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3437                         $positive = "false";
3438                 }
3439
3440                 return(array("author" => self::my_handle($owner),
3441                                 "guid" => $item["guid"],
3442                                 "parent_guid" => $parent["guid"],
3443                                 "parent_type" => $target_type,
3444                                 "positive" => $positive,
3445                                 "author_signature" => ""));
3446         }
3447
3448         /**
3449          * @brief Creates an "EventParticipation" object
3450          *
3451          * @param array $item The item that will be exported
3452          * @param array $owner the array of the item owner
3453          *
3454          * @return array The data for an "EventParticipation"
3455          */
3456         private static function construct_attend($item, $owner) {
3457
3458                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3459                         dbesc($item["thr-parent"]));
3460                 if (!DBM::is_result($p))
3461                         return false;
3462
3463                 $parent = $p[0];
3464
3465                 switch ($item['verb']) {
3466                         case ACTIVITY_ATTEND:
3467                                 $attend_answer = 'accepted';
3468                                 break;
3469                         case ACTIVITY_ATTENDNO:
3470                                 $attend_answer = 'declined';
3471                                 break;
3472                         case ACTIVITY_ATTENDMAYBE:
3473                                 $attend_answer = 'tentative';
3474                                 break;
3475                         default:
3476                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3477                                 return false;
3478                 }
3479
3480                 return(array("author" => self::my_handle($owner),
3481                                 "guid" => $item["guid"],
3482                                 "parent_guid" => $parent["guid"],
3483                                 "status" => $attend_answer,
3484                                 "author_signature" => ""));
3485         }
3486
3487         /**
3488          * @brief Creates the object for a comment
3489          *
3490          * @param array $item The item that will be exported
3491          * @param array $owner the array of the item owner
3492          *
3493          * @return array The data for a comment
3494          */
3495         private static function construct_comment($item, $owner) {
3496
3497                 $cachekey = "diaspora:construct_comment:".$item['guid'];
3498
3499                 $result = Cache::get($cachekey);
3500                 if (!is_null($result)) {
3501                         return $result;
3502                 }
3503
3504                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3505                         intval($item["parent"]),
3506                         intval($item["parent"])
3507                 );
3508
3509                 if (!DBM::is_result($p))
3510                         return false;
3511
3512                 $parent = $p[0];
3513
3514                 $text = html_entity_decode(bb2diaspora($item["body"]));
3515                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3516
3517                 $comment = array("author" => self::my_handle($owner),
3518                                 "guid" => $item["guid"],
3519                                 "created_at" => $created,
3520                                 "parent_guid" => $parent["guid"],
3521                                 "text" => $text,
3522                                 "author_signature" => "");
3523
3524                 // Send the thread parent guid only if it is a threaded comment
3525                 if ($item['thr-parent'] != $item['parent-uri']) {
3526                         $comment['thread_parent_guid'] = self::get_guid_from_uri($item['thr-parent'], $item['uid']);
3527                 }
3528
3529                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3530
3531                 return($comment);
3532         }
3533
3534         /**
3535          * @brief Send a like or a comment
3536          *
3537          * @param array $item The item that will be exported
3538          * @param array $owner the array of the item owner
3539          * @param array $contact Target of the communication
3540          * @param bool $public_batch Is it a public post?
3541          *
3542          * @return int The result of the transmission
3543          */
3544         public static function send_followup($item,$owner,$contact,$public_batch = false) {
3545
3546                 if (in_array($item['verb'], array(ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE))) {
3547                         $message = self::construct_attend($item, $owner);
3548                         $type = "event_participation";
3549                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3550                         $message = self::construct_like($item, $owner);
3551                         $type = "like";
3552                 } else {
3553                         $message = self::construct_comment($item, $owner);
3554                         $type = "comment";
3555                 }
3556
3557                 if (!$message)
3558                         return false;
3559
3560                 $message["author_signature"] = self::signature($owner, $message);
3561
3562                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3563         }
3564
3565         /**
3566          * @brief Creates a message from a signature record entry
3567          *
3568          * @param array $item The item that will be exported
3569          * @param array $signature The entry of the "sign" record
3570          *
3571          * @return string The message
3572          */
3573         private static function message_from_signature($item, $signature) {
3574
3575                 // Split the signed text
3576                 $signed_parts = explode(";", $signature['signed_text']);
3577
3578                 if ($item["deleted"]) {
3579                         $message = array("author" => $signature['signer'],
3580                                         "target_guid" => $signed_parts[0],
3581                                         "target_type" => $signed_parts[1]);
3582                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3583                         $message = array("author" => $signed_parts[4],
3584                                         "guid" => $signed_parts[1],
3585                                         "parent_guid" => $signed_parts[3],
3586                                         "parent_type" => $signed_parts[2],
3587                                         "positive" => $signed_parts[0],
3588                                         "author_signature" => $signature['signature'],
3589                                         "parent_author_signature" => "");
3590                 } else {
3591                         // Remove the comment guid
3592                         $guid = array_shift($signed_parts);
3593
3594                         // Remove the parent guid
3595                         $parent_guid = array_shift($signed_parts);
3596
3597                         // Remove the handle
3598                         $handle = array_pop($signed_parts);
3599
3600                         // Glue the parts together
3601                         $text = implode(";", $signed_parts);
3602
3603                         $message = array("author" => $handle,
3604                                         "guid" => $guid,
3605                                         "parent_guid" => $parent_guid,
3606                                         "text" => implode(";", $signed_parts),
3607                                         "author_signature" => $signature['signature'],
3608                                         "parent_author_signature" => "");
3609                 }
3610                 return $message;
3611         }
3612
3613         /**
3614          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3615          *
3616          * @param array $item The item that will be exported
3617          * @param array $owner the array of the item owner
3618          * @param array $contact Target of the communication
3619          * @param bool $public_batch Is it a public post?
3620          *
3621          * @return int The result of the transmission
3622          */
3623         public static function send_relay($item, $owner, $contact, $public_batch = false) {
3624
3625                 if ($item["deleted"]) {
3626                         return self::send_retraction($item, $owner, $contact, $public_batch, true);
3627                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3628                         $type = "like";
3629                 } else {
3630                         $type = "comment";
3631                 }
3632
3633                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3634
3635                 // fetch the original signature
3636
3637                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3638                         intval($item["id"]));
3639
3640                 if (!$r) {
3641                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3642                         return false;
3643                 }
3644
3645                 $signature = $r[0];
3646
3647                 // Old way - is used by the internal Friendica functions
3648                 /// @todo Change all signatur storing functions to the new format
3649                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer'])
3650                         $message = self::message_from_signature($item, $signature);
3651                 else {// New way
3652                         $msg = json_decode($signature['signed_text'], true);
3653
3654                         $message = array();
3655                         if (is_array($msg)) {
3656                                 foreach ($msg AS $field => $data) {
3657                                         if (!$item["deleted"]) {
3658                                                 if ($field == "diaspora_handle") {
3659                                                         $field = "author";
3660                                                 }
3661                                                 if ($field == "target_type") {
3662                                                         $field = "parent_type";
3663                                                 }
3664                                         }
3665
3666                                         $message[$field] = $data;
3667                                 }
3668                         } else
3669                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3670                 }
3671
3672                 $message["parent_author_signature"] = self::signature($owner, $message);
3673
3674                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3675
3676                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3677         }
3678
3679         /**
3680          * @brief Sends a retraction (deletion) of a message, like or comment
3681          *
3682          * @param array $item The item that will be exported
3683          * @param array $owner the array of the item owner
3684          * @param array $contact Target of the communication
3685          * @param bool $public_batch Is it a public post?
3686          * @param bool $relay Is the retraction transmitted from a relay?
3687          *
3688          * @return int The result of the transmission
3689          */
3690         public static function send_retraction($item, $owner, $contact, $public_batch = false, $relay = false) {
3691
3692                 $itemaddr = self::handle_from_contact($item["contact-id"], $item["gcontact-id"]);
3693
3694                 $msg_type = "retraction";
3695
3696                 if ($item['id'] == $item['parent']) {
3697                         $target_type = "Post";
3698                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3699                         $target_type = "Like";
3700                 } else {
3701                         $target_type = "Comment";
3702                 }
3703
3704                 $message = array("author" => $itemaddr,
3705                                 "target_guid" => $item['guid'],
3706                                 "target_type" => $target_type);
3707
3708                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3709
3710                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3711         }
3712
3713         /**
3714          * @brief Sends a mail
3715          *
3716          * @param array $item The item that will be exported
3717          * @param array $owner The owner
3718          * @param array $contact Target of the communication
3719          *
3720          * @return int The result of the transmission
3721          */
3722         public static function send_mail($item, $owner, $contact) {
3723
3724                 $myaddr = self::my_handle($owner);
3725
3726                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3727                         intval($item["convid"]),
3728                         intval($item["uid"])
3729                 );
3730
3731                 if (!DBM::is_result($r)) {
3732                         logger("conversation not found.");
3733                         return;
3734                 }
3735                 $cnv = $r[0];
3736
3737                 $conv = array(
3738                         "author" => $cnv["creator"],
3739                         "guid" => $cnv["guid"],
3740                         "subject" => $cnv["subject"],
3741                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3742                         "participants" => $cnv["recips"]
3743                 );
3744
3745                 $body = bb2diaspora($item["body"]);
3746                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3747
3748                 $msg = array(
3749                         "author" => $myaddr,
3750                         "guid" => $item["guid"],
3751                         "conversation_guid" => $cnv["guid"],
3752                         "text" => $body,
3753                         "created_at" => $created,
3754                 );
3755
3756                 if ($item["reply"]) {
3757                         $message = $msg;
3758                         $type = "message";
3759                 } else {
3760                         $message = array(
3761                                         "author" => $cnv["creator"],
3762                                         "guid" => $cnv["guid"],
3763                                         "subject" => $cnv["subject"],
3764                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3765                                         "participants" => $cnv["recips"],
3766                                         "message" => $msg);
3767
3768                         $type = "conversation";
3769                 }
3770
3771                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
3772         }
3773
3774         /**
3775          * @brief Create profile data
3776          *
3777          * @param int $uid The user id
3778          *
3779          * @return array The profile data
3780          */
3781         private static function createProfileData($uid) {
3782                 $r = q("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3783                         FROM `profile`
3784                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3785                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3786                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3787                         intval($uid)
3788                 );
3789
3790                 if (!$r) {
3791                         return array();
3792                 }
3793
3794                 $profile = $r[0];
3795
3796                 $handle = $profile["addr"];
3797                 $first = ((strpos($profile['name'],' ')
3798                         ? trim(substr($profile['name'],0,strpos($profile['name'],' '))) : $profile['name']));
3799                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3800                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3801                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3802                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3803                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
3804
3805                 if ($searchable === 'true') {
3806                         $dob = '1000-00-00';
3807
3808                         if (($profile['dob']) && ($profile['dob'] > '0001-01-01'))
3809                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC','UTC',$profile['dob'],'m-d');
3810
3811                         $about = $profile['about'];
3812                         $about = strip_tags(bbcode($about));
3813
3814                         $location = formatted_location($profile);
3815                         $tags = '';
3816                         if ($profile['pub_keywords']) {
3817                                 $kw = str_replace(',',' ',$profile['pub_keywords']);
3818                                 $kw = str_replace('  ',' ',$kw);
3819                                 $arr = explode(' ',$profile['pub_keywords']);
3820                                 if (count($arr)) {
3821                                         for ($x = 0; $x < 5; $x ++) {
3822                                                 if (trim($arr[$x]))
3823                                                         $tags .= '#'. trim($arr[$x]) .' ';
3824                                         }
3825                                 }
3826                         }
3827                         $tags = trim($tags);
3828                 }
3829
3830                 return array("author" => $handle,
3831                                 "first_name" => $first,
3832                                 "last_name" => $last,
3833                                 "image_url" => $large,
3834                                 "image_url_medium" => $medium,
3835                                 "image_url_small" => $small,
3836                                 "birthday" => $dob,
3837                                 "gender" => $profile['gender'],
3838                                 "bio" => $about,
3839                                 "location" => $location,
3840                                 "searchable" => $searchable,
3841                                 "nsfw" => "false",
3842                                 "tag_string" => $tags);
3843         }
3844
3845         /**
3846          * @brief Sends profile data
3847          *
3848          * @param int $uid The user id
3849          */
3850         public static function send_profile($uid, $recips = false) {
3851
3852                 if (!$uid)
3853                         return;
3854
3855                 if (!$recips)
3856                         $recips = q("SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3857                                 AND `uid` = %d AND `rel` != %d",
3858                                 dbesc(NETWORK_DIASPORA),
3859                                 intval($uid),
3860                                 intval(CONTACT_IS_SHARING)
3861                         );
3862                 if (!$recips)
3863                         return;
3864
3865                 $message = self::createProfileData($uid);
3866
3867                 foreach ($recips as $recip) {
3868                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
3869                         self::build_and_transmit($profile, $recip, "profile", $message, false, "", true);
3870                 }
3871         }
3872
3873         /**
3874          * @brief Stores the signature for likes that are created on our system
3875          *
3876          * @param array $contact The contact array of the "like"
3877          * @param int $post_id The post id of the "like"
3878          *
3879          * @return bool Success
3880          */
3881         public static function store_like_signature($contact, $post_id) {
3882
3883                 // Is the contact the owner? Then fetch the private key
3884                 if (!$contact['self'] || ($contact['uid'] == 0)) {
3885                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
3886                         return false;
3887                 }
3888
3889                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
3890                 if (!DBM::is_result($r)) {
3891                         return false;
3892                 }
3893
3894                 $contact["uprvkey"] = $r[0]['prvkey'];
3895
3896                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
3897                 if (!DBM::is_result($r)) {
3898                         return false;
3899                 }
3900
3901                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3902                         return false;
3903                 }
3904
3905                 $message = self::construct_like($r[0], $contact);
3906                 $message["author_signature"] = self::signature($contact, $message);
3907
3908                 /*
3909                  * Now store the signature more flexible to dynamically support new fields.
3910                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
3911                  */
3912                 dba::insert('sign', array('iid' => $post_id, 'signed_text' => json_encode($message)));
3913
3914                 logger('Stored diaspora like signature');
3915                 return true;
3916         }
3917
3918         /**
3919          * @brief Stores the signature for comments that are created on our system
3920          *
3921          * @param array $item The item array of the comment
3922          * @param array $contact The contact array of the item owner
3923          * @param string $uprvkey The private key of the sender
3924          * @param int $message_id The message id of the comment
3925          *
3926          * @return bool Success
3927          */
3928         public static function store_comment_signature($item, $contact, $uprvkey, $message_id) {
3929
3930                 if ($uprvkey == "") {
3931                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
3932                         return false;
3933                 }
3934
3935                 $contact["uprvkey"] = $uprvkey;
3936
3937                 $message = self::construct_comment($item, $contact);
3938                 $message["author_signature"] = self::signature($contact, $message);
3939
3940                 /*
3941                  * Now store the signature more flexible to dynamically support new fields.
3942                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
3943                  */
3944                 dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($message)));
3945
3946                 logger('Stored diaspora comment signature');
3947                 return true;
3948         }
3949 }