include/diaspora.php

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