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                 $r = q("SELECT `id`, `parent`, `body`, `wall`, `uri`, `private`, `origin`,
1187                                 `author-name`, `author-link`, `author-avatar`,
1188                                 `owner-name`, `owner-link`, `owner-avatar`
1189                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1190                         intval($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) {
1270                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
1271
1272                 // Fallback
1273                 if (!$r)
1274                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1275
1276                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
1277                 // So we try another way as well.
1278                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
1279                 if ($s)
1280                         $r[0]["network"] = $s[0]["network"];
1281
1282                 if ($r[0]["network"] == NETWORK_DFRN)
1283                         return(str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/"));
1284
1285                 if (self::is_redmatrix($r[0]["url"]))
1286                         return $r[0]["url"]."/?f=&mid=".$guid;
1287
1288                 return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1289         }
1290
1291         /**
1292          * @brief Processes an account deletion
1293          *
1294          * @param array $importer Array of the importer user
1295          * @param object $data The message object
1296          *
1297          * @return bool Success
1298          */
1299         private static function receive_account_deletion($importer, $data) {
1300
1301                 /// @todo Account deletion should remove the contact from the global contacts as well
1302
1303                 $author = notags(unxmlify($data->author));
1304
1305                 $contact = self::contact_by_handle($importer["uid"], $author);
1306                 if (!$contact) {
1307                         logger("cannot find contact for author: ".$author);
1308                         return false;
1309                 }
1310
1311                 // We now remove the contact
1312                 contact_remove($contact["id"]);
1313                 return true;
1314         }
1315
1316         /**
1317          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1318          *
1319          * @param string $author Author handle
1320          * @param string $guid Message guid
1321          * @param boolean $onlyfound Only return uri when found in the database
1322          *
1323          * @return string The constructed uri or the one from our database
1324          */
1325         private static function get_uri_from_guid($author, $guid, $onlyfound = false) {
1326
1327                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1328                 if (dbm::is_result($r)) {
1329                         return $r[0]["uri"];
1330                 } elseif (!$onlyfound) {
1331                         return $author.":".$guid;
1332                 }
1333
1334                 return "";
1335         }
1336
1337         /**
1338          * @brief Fetch the guid from our database with a given uri
1339          *
1340          * @param string $author Author handle
1341          * @param string $uri Message uri
1342          *
1343          * @return string The post guid
1344          */
1345         private static function get_guid_from_uri($uri, $uid) {
1346
1347                 $r = q("SELECT `guid` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($uri), intval($uid));
1348                 if (dbm::is_result($r)) {
1349                         return $r[0]["guid"];
1350                 } else {
1351                         return false;
1352                 }
1353         }
1354
1355         /**
1356          * @brief Find the best importer for a comment, like, ...
1357          *
1358          * @param string $guid The guid of the item
1359          *
1360          * @return array|boolean the origin owner of that post - or false
1361          */
1362         private static function importer_for_guid($guid) {
1363                 $item = dba::fetch_first("SELECT `uid` FROM `item` WHERE `origin` AND `guid` = ? LIMIT 1", $guid);
1364
1365                 if (dbm::is_result($item)) {
1366                         logger("Found user ".$item['uid']." as owner of item ".$guid, LOGGER_DEBUG);
1367                         $contact = dba::fetch_first("SELECT * FROM `contact` WHERE `self` AND `uid` = ?", $item['uid']);
1368                         if (dbm::is_result($contact)) {
1369                                 return $contact;
1370                         }
1371                 }
1372                 return false;
1373         }
1374
1375         /**
1376          * @brief Processes an incoming comment
1377          *
1378          * @param array $importer Array of the importer user
1379          * @param string $sender The sender of the message
1380          * @param object $data The message object
1381          * @param string $xml The original XML of the message
1382          *
1383          * @return int The message id of the generated comment or "false" if there was an error
1384          */
1385         private static function receive_comment($importer, $sender, $data, $xml) {
1386                 $author = notags(unxmlify($data->author));
1387                 $guid = notags(unxmlify($data->guid));
1388                 $parent_guid = notags(unxmlify($data->parent_guid));
1389                 $text = unxmlify($data->text);
1390
1391                 if (isset($data->created_at)) {
1392                         $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1393                 } else {
1394                         $created_at = datetime_convert();
1395                 }
1396
1397                 if (isset($data->thread_parent_guid)) {
1398                         $thread_parent_guid = notags(unxmlify($data->thread_parent_guid));
1399                         $thr_uri = self::get_uri_from_guid("", $thread_parent_guid, true);
1400                 } else {
1401                         $thr_uri = "";
1402                 }
1403
1404                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1405                 if (!$contact) {
1406                         return false;
1407                 }
1408
1409                 $message_id = self::message_exists($importer["uid"], $guid);
1410                 if ($message_id) {
1411                         return true;
1412                 }
1413
1414                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1415                 if (!$parent_item) {
1416                         return false;
1417                 }
1418
1419                 $person = self::person_by_handle($author);
1420                 if (!is_array($person)) {
1421                         logger("unable to find author details");
1422                         return false;
1423                 }
1424
1425                 // Fetch the contact id - if we know this contact
1426                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1427
1428                 $datarray = array();
1429
1430                 $datarray["uid"] = $importer["uid"];
1431                 $datarray["contact-id"] = $author_contact["cid"];
1432                 $datarray["network"]  = $author_contact["network"];
1433
1434                 $datarray["author-name"] = $person["name"];
1435                 $datarray["author-link"] = $person["url"];
1436                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1437
1438                 $datarray["owner-name"] = $contact["name"];
1439                 $datarray["owner-link"] = $contact["url"];
1440                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1441
1442                 $datarray["guid"] = $guid;
1443                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1444
1445                 $datarray["type"] = "remote-comment";
1446                 $datarray["verb"] = ACTIVITY_POST;
1447                 $datarray["gravity"] = GRAVITY_COMMENT;
1448
1449                 if ($thr_uri != "") {
1450                         $datarray["parent-uri"] = $thr_uri;
1451                 } else {
1452                         $datarray["parent-uri"] = $parent_item["uri"];
1453                 }
1454
1455                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1456
1457                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1458                 $datarray["source"] = $xml;
1459
1460                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1461
1462                 $body = diaspora2bb($text);
1463
1464                 $datarray["body"] = self::replace_people_guid($body, $person["url"]);
1465
1466                 self::fetch_guid($datarray);
1467
1468                 $message_id = item_store($datarray);
1469
1470                 if ($message_id <= 0) {
1471                         return false;
1472                 }
1473
1474                 if ($message_id) {
1475                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1476                 }
1477
1478                 // If we are the origin of the parent we store the original data and notify our followers
1479                 if ($message_id && $parent_item["origin"]) {
1480
1481                         // Formerly we stored the signed text, the signature and the author in different fields.
1482                         // We now store the raw data so that we are more flexible.
1483                         dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($data)));
1484
1485                         // notify others
1486                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1487                 }
1488
1489                 return true;
1490         }
1491
1492         /**
1493          * @brief processes and stores private messages
1494          *
1495          * @param array $importer Array of the importer user
1496          * @param array $contact The contact of the message
1497          * @param object $data The message object
1498          * @param array $msg Array of the processed message, author handle and key
1499          * @param object $mesg The private message
1500          * @param array $conversation The conversation record to which this message belongs
1501          *
1502          * @return bool "true" if it was successful
1503          */
1504         private static function receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation) {
1505                 $author = notags(unxmlify($data->author));
1506                 $guid = notags(unxmlify($data->guid));
1507                 $subject = notags(unxmlify($data->subject));
1508
1509                 // "diaspora_handle" is the element name from the old version
1510                 // "author" is the element name from the new version
1511                 if ($mesg->author) {
1512                         $msg_author = notags(unxmlify($mesg->author));
1513                 } elseif ($mesg->diaspora_handle) {
1514                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1515                 } else {
1516                         return false;
1517                 }
1518
1519                 $msg_guid = notags(unxmlify($mesg->guid));
1520                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1521                 $msg_text = unxmlify($mesg->text);
1522                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1523
1524                 if ($msg_conversation_guid != $guid) {
1525                         logger("message conversation guid does not belong to the current conversation.");
1526                         return false;
1527                 }
1528
1529                 $body = diaspora2bb($msg_text);
1530                 $message_uri = $msg_author.":".$msg_guid;
1531
1532                 $person = self::person_by_handle($msg_author);
1533
1534                 dba::lock('mail');
1535
1536                 $r = q("SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1537                         dbesc($msg_guid),
1538                         intval($importer["uid"])
1539                 );
1540                 if (dbm::is_result($r)) {
1541                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1542                         return false;
1543                 }
1544
1545                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1546                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1547                         intval($importer["uid"]),
1548                         dbesc($msg_guid),
1549                         intval($conversation["id"]),
1550                         dbesc($person["name"]),
1551                         dbesc($person["photo"]),
1552                         dbesc($person["url"]),
1553                         intval($contact["id"]),
1554                         dbesc($subject),
1555                         dbesc($body),
1556                         0,
1557                         0,
1558                         dbesc($message_uri),
1559                         dbesc($author.":".$guid),
1560                         dbesc($msg_created_at)
1561                 );
1562
1563                 dba::unlock();
1564
1565                 dba::update('conv', array('updated' => datetime_convert()), array('id' => $conversation["id"]));
1566
1567                 notification(array(
1568                         "type" => NOTIFY_MAIL,
1569                         "notify_flags" => $importer["notify-flags"],
1570                         "language" => $importer["language"],
1571                         "to_name" => $importer["username"],
1572                         "to_email" => $importer["email"],
1573                         "uid" =>$importer["uid"],
1574                         "item" => array("subject" => $subject, "body" => $body),
1575                         "source_name" => $person["name"],
1576                         "source_link" => $person["url"],
1577                         "source_photo" => $person["thumb"],
1578                         "verb" => ACTIVITY_POST,
1579                         "otype" => "mail"
1580                 ));
1581                 return true;
1582         }
1583
1584         /**
1585          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1586          *
1587          * @param array $importer Array of the importer user
1588          * @param array $msg Array of the processed message, author handle and key
1589          * @param object $data The message object
1590          *
1591          * @return bool Success
1592          */
1593         private static function receive_conversation($importer, $msg, $data) {
1594                 $author = notags(unxmlify($data->author));
1595                 $guid = notags(unxmlify($data->guid));
1596                 $subject = notags(unxmlify($data->subject));
1597                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1598                 $participants = notags(unxmlify($data->participants));
1599
1600                 $messages = $data->message;
1601
1602                 if (!count($messages)) {
1603                         logger("empty conversation");
1604                         return false;
1605                 }
1606
1607                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1608                 if (!$contact)
1609                         return false;
1610
1611                 $conversation = null;
1612
1613                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1614                         intval($importer["uid"]),
1615                         dbesc($guid)
1616                 );
1617                 if ($c)
1618                         $conversation = $c[0];
1619                 else {
1620                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1621                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1622                                 intval($importer["uid"]),
1623                                 dbesc($guid),
1624                                 dbesc($author),
1625                                 dbesc($created_at),
1626                                 dbesc(datetime_convert()),
1627                                 dbesc($subject),
1628                                 dbesc($participants)
1629                         );
1630                         if ($r)
1631                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1632                                         intval($importer["uid"]),
1633                                         dbesc($guid)
1634                                 );
1635
1636                         if ($c)
1637                                 $conversation = $c[0];
1638                 }
1639                 if (!$conversation) {
1640                         logger("unable to create conversation.");
1641                         return false;
1642                 }
1643
1644                 foreach ($messages as $mesg)
1645                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation);
1646
1647                 return true;
1648         }
1649
1650         /**
1651          * @brief Creates the body for a "like" message
1652          *
1653          * @param array $contact The contact that send us the "like"
1654          * @param array $parent_item The item array of the parent item
1655          * @param string $guid message guid
1656          *
1657          * @return string the body
1658          */
1659         private static function construct_like_body($contact, $parent_item, $guid) {
1660                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1661
1662                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1663                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1664                 $plink = "[url=".System::baseUrl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1665
1666                 return sprintf($bodyverb, $ulink, $alink, $plink);
1667         }
1668
1669         /**
1670          * @brief Creates a XML object for a "like"
1671          *
1672          * @param array $importer Array of the importer user
1673          * @param array $parent_item The item array of the parent item
1674          *
1675          * @return string The XML
1676          */
1677         private static function construct_like_object($importer, $parent_item) {
1678                 $objtype = ACTIVITY_OBJ_NOTE;
1679                 $link = '<link rel="alternate" type="text/html" href="'.System::baseUrl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1680                 $parent_body = $parent_item["body"];
1681
1682                 $xmldata = array("object" => array("type" => $objtype,
1683                                                 "local" => "1",
1684                                                 "id" => $parent_item["uri"],
1685                                                 "link" => $link,
1686                                                 "title" => "",
1687                                                 "content" => $parent_body));
1688
1689                 return xml::from_array($xmldata, $xml, true);
1690         }
1691
1692         /**
1693          * @brief Processes "like" messages
1694          *
1695          * @param array $importer Array of the importer user
1696          * @param string $sender The sender of the message
1697          * @param object $data The message object
1698          *
1699          * @return int The message id of the generated like or "false" if there was an error
1700          */
1701         private static function receive_like($importer, $sender, $data) {
1702                 $author = notags(unxmlify($data->author));
1703                 $guid = notags(unxmlify($data->guid));
1704                 $parent_guid = notags(unxmlify($data->parent_guid));
1705                 $parent_type = notags(unxmlify($data->parent_type));
1706                 $positive = notags(unxmlify($data->positive));
1707
1708                 // likes on comments aren't supported by Diaspora - only on posts
1709                 // But maybe this will be supported in the future, so we will accept it.
1710                 if (!in_array($parent_type, array("Post", "Comment")))
1711                         return false;
1712
1713                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1714                 if (!$contact)
1715                         return false;
1716
1717                 $message_id = self::message_exists($importer["uid"], $guid);
1718                 if ($message_id)
1719                         return true;
1720
1721                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1722                 if (!$parent_item)
1723                         return false;
1724
1725                 $person = self::person_by_handle($author);
1726                 if (!is_array($person)) {
1727                         logger("unable to find author details");
1728                         return false;
1729                 }
1730
1731                 // Fetch the contact id - if we know this contact
1732                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1733
1734                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1735                 // We would accept this anyhow.
1736                 if ($positive == "true")
1737                         $verb = ACTIVITY_LIKE;
1738                 else
1739                         $verb = ACTIVITY_DISLIKE;
1740
1741                 $datarray = array();
1742
1743                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1744
1745                 $datarray["uid"] = $importer["uid"];
1746                 $datarray["contact-id"] = $author_contact["cid"];
1747                 $datarray["network"]  = $author_contact["network"];
1748
1749                 $datarray["author-name"] = $person["name"];
1750                 $datarray["author-link"] = $person["url"];
1751                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1752
1753                 $datarray["owner-name"] = $contact["name"];
1754                 $datarray["owner-link"] = $contact["url"];
1755                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1756
1757                 $datarray["guid"] = $guid;
1758                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1759
1760                 $datarray["type"] = "activity";
1761                 $datarray["verb"] = $verb;
1762                 $datarray["gravity"] = GRAVITY_LIKE;
1763                 $datarray["parent-uri"] = $parent_item["uri"];
1764
1765                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1766                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1767
1768                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1769
1770                 $message_id = item_store($datarray);
1771
1772                 if ($message_id <= 0) {
1773                         return false;
1774                 }
1775
1776                 if ($message_id) {
1777                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1778                 }
1779
1780                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
1781                 if ($parent_item["id"] != $parent_item["parent"]) {
1782                         $toplevel = dba::select('item', array('origin'), array('id' => $parent_item["parent"]), array('limit' => 1));
1783                         $origin = $toplevel["origin"];
1784                 } else {
1785                         $origin = $parent_item["origin"];
1786                 }
1787
1788                 // If we are the origin of the parent we store the original data and notify our followers
1789                 if ($message_id && $origin) {
1790
1791                         // Formerly we stored the signed text, the signature and the author in different fields.
1792                         // We now store the raw data so that we are more flexible.
1793                         dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($data)));
1794
1795                         // notify others
1796                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1797                 }
1798
1799                 return true;
1800         }
1801
1802         /**
1803          * @brief Processes private messages
1804          *
1805          * @param array $importer Array of the importer user
1806          * @param object $data The message object
1807          *
1808          * @return bool Success?
1809          */
1810         private static function receive_message($importer, $data) {
1811                 $author = notags(unxmlify($data->author));
1812                 $guid = notags(unxmlify($data->guid));
1813                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1814                 $text = unxmlify($data->text);
1815                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1816
1817                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1818                 if (!$contact) {
1819                         return false;
1820                 }
1821
1822                 $conversation = null;
1823
1824                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1825                         intval($importer["uid"]),
1826                         dbesc($conversation_guid)
1827                 );
1828                 if ($c) {
1829                         $conversation = $c[0];
1830                 } else {
1831                         logger("conversation not available.");
1832                         return false;
1833                 }
1834
1835                 $message_uri = $author.":".$guid;
1836
1837                 $person = self::person_by_handle($author);
1838                 if (!$person) {
1839                         logger("unable to find author details");
1840                         return false;
1841                 }
1842
1843                 $body = diaspora2bb($text);
1844
1845                 $body = self::replace_people_guid($body, $person["url"]);
1846
1847                 dba::lock('mail');
1848
1849                 $r = q("SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1850                         dbesc($guid),
1851                         intval($importer["uid"])
1852                 );
1853                 if (dbm::is_result($r)) {
1854                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1855                         return false;
1856                 }
1857
1858                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1859                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1860                         intval($importer["uid"]),
1861                         dbesc($guid),
1862                         intval($conversation["id"]),
1863                         dbesc($person["name"]),
1864                         dbesc($person["photo"]),
1865                         dbesc($person["url"]),
1866                         intval($contact["id"]),
1867                         dbesc($conversation["subject"]),
1868                         dbesc($body),
1869                         0,
1870                         1,
1871                         dbesc($message_uri),
1872                         dbesc($author.":".$conversation["guid"]),
1873                         dbesc($created_at)
1874                 );
1875
1876                 dba::unlock();
1877
1878                 dba::update('conv', array('updated' => datetime_convert()), array('id' => $conversation["id"]));
1879                 return true;
1880         }
1881
1882         /**
1883          * @brief Processes participations - unsupported by now
1884          *
1885          * @param array $importer Array of the importer user
1886          * @param object $data The message object
1887          *
1888          * @return bool always true
1889          */
1890         private static function receive_participation($importer, $data) {
1891                 // I'm not sure if we can fully support this message type
1892                 return true;
1893         }
1894
1895         /**
1896          * @brief Processes photos - unneeded
1897          *
1898          * @param array $importer Array of the importer user
1899          * @param object $data The message object
1900          *
1901          * @return bool always true
1902          */
1903         private static function receive_photo($importer, $data) {
1904                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
1905                 return true;
1906         }
1907
1908         /**
1909          * @brief Processes poll participations - unssupported
1910          *
1911          * @param array $importer Array of the importer user
1912          * @param object $data The message object
1913          *
1914          * @return bool always true
1915          */
1916         private static function receive_poll_participation($importer, $data) {
1917                 // We don't support polls by now
1918                 return true;
1919         }
1920
1921         /**
1922          * @brief Processes incoming profile updates
1923          *
1924          * @param array $importer Array of the importer user
1925          * @param object $data The message object
1926          *
1927          * @return bool Success
1928          */
1929         private static function receive_profile($importer, $data) {
1930                 $author = strtolower(notags(unxmlify($data->author)));
1931
1932                 $contact = self::contact_by_handle($importer["uid"], $author);
1933                 if (!$contact)
1934                         return false;
1935
1936                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
1937                 $image_url = unxmlify($data->image_url);
1938                 $birthday = unxmlify($data->birthday);
1939                 $gender = unxmlify($data->gender);
1940                 $about = diaspora2bb(unxmlify($data->bio));
1941                 $location = diaspora2bb(unxmlify($data->location));
1942                 $searchable = (unxmlify($data->searchable) == "true");
1943                 $nsfw = (unxmlify($data->nsfw) == "true");
1944                 $tags = unxmlify($data->tag_string);
1945
1946                 $tags = explode("#", $tags);
1947
1948                 $keywords = array();
1949                 foreach ($tags as $tag) {
1950                         $tag = trim(strtolower($tag));
1951                         if ($tag != "")
1952                                 $keywords[] = $tag;
1953                 }
1954
1955                 $keywords = implode(", ", $keywords);
1956
1957                 $handle_parts = explode("@", $author);
1958                 $nick = $handle_parts[0];
1959
1960                 if ($name === "")
1961                         $name = $handle_parts[0];
1962
1963                 if ( preg_match("|^https?://|", $image_url) === 0)
1964                         $image_url = "http://".$handle_parts[1].$image_url;
1965
1966                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
1967
1968                 // Generic birthday. We don't know the timezone. The year is irrelevant.
1969
1970                 $birthday = str_replace("1000", "1901", $birthday);
1971
1972                 if ($birthday != "")
1973                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
1974
1975                 // this is to prevent multiple birthday notifications in a single year
1976                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
1977
1978                 if (substr($birthday,5) === substr($contact["bd"],5))
1979                         $birthday = $contact["bd"];
1980
1981                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
1982                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
1983                         dbesc($name),
1984                         dbesc($nick),
1985                         dbesc($author),
1986                         dbesc(datetime_convert()),
1987                         dbesc($birthday),
1988                         dbesc($location),
1989                         dbesc($about),
1990                         dbesc($keywords),
1991                         dbesc($gender),
1992                         intval($contact["id"]),
1993                         intval($importer["uid"])
1994                 );
1995
1996                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
1997                                         "photo" => $image_url, "name" => $name, "location" => $location,
1998                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
1999                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2000                                         "hide" => !$searchable, "nsfw" => $nsfw);
2001
2002                 $gcid = update_gcontact($gcontact);
2003
2004                 link_gcontact($gcid, $importer["uid"], $contact["id"]);
2005
2006                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
2007
2008                 return true;
2009         }
2010
2011         /**
2012          * @brief Processes incoming friend requests
2013          *
2014          * @param array $importer Array of the importer user
2015          * @param array $contact The contact that send the request
2016          */
2017         private static function receive_request_make_friend($importer, $contact) {
2018
2019                 $a = get_app();
2020
2021                 if ($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
2022                         dba::update('contact', array('rel' => CONTACT_IS_FRIEND, 'writable' => true),
2023                                         array('id' => $contact["id"], 'uid' => $importer["uid"]));
2024                 }
2025                 // send notification
2026
2027                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
2028                         intval($importer["uid"])
2029                 );
2030
2031                 if ($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(get_pconfig($importer["uid"], "system", "post_newfriend"))) {
2032
2033                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
2034                                 intval($importer["uid"])
2035                         );
2036
2037                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
2038
2039                         if ($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
2040
2041                                 $arr = array();
2042                                 $arr["protocol"] = PROTOCOL_DIASPORA;
2043                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
2044                                 $arr["uid"] = $importer["uid"];
2045                                 $arr["contact-id"] = $self[0]["id"];
2046                                 $arr["wall"] = 1;
2047                                 $arr["type"] = 'wall';
2048                                 $arr["gravity"] = 0;
2049                                 $arr["origin"] = 1;
2050                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
2051                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
2052                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
2053                                 $arr["verb"] = ACTIVITY_FRIEND;
2054                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
2055
2056                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
2057                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
2058                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
2059                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
2060
2061                                 $arr["object"] = self::construct_new_friend_object($contact);
2062
2063                                 $arr["last-child"] = 1;
2064
2065                                 $arr["allow_cid"] = $user[0]["allow_cid"];
2066                                 $arr["allow_gid"] = $user[0]["allow_gid"];
2067                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
2068                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
2069
2070                                 $i = item_store($arr);
2071                                 if ($i)
2072                                         proc_run(PRIORITY_HIGH, "include/notifier.php", "activity", $i);
2073                         }
2074                 }
2075         }
2076
2077         /**
2078          * @brief Creates a XML object for a "new friend" message
2079          *
2080          * @param array $contact Array of the contact
2081          *
2082          * @return string The XML
2083          */
2084         private static function construct_new_friend_object($contact) {
2085                 $objtype = ACTIVITY_OBJ_PERSON;
2086                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
2087                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
2088
2089                 $xmldata = array("object" => array("type" => $objtype,
2090                                                 "title" => $contact["name"],
2091                                                 "id" => $contact["url"]."/".$contact["name"],
2092                                                 "link" => $link));
2093
2094                 return xml::from_array($xmldata, $xml, true);
2095         }
2096
2097         /**
2098          * @brief Processes incoming sharing notification
2099          *
2100          * @param array $importer Array of the importer user
2101          * @param object $data The message object
2102          *
2103          * @return bool Success
2104          */
2105         private static function receive_contact_request($importer, $data) {
2106                 $author = unxmlify($data->author);
2107                 $recipient = unxmlify($data->recipient);
2108
2109                 if (!$author || !$recipient) {
2110                         return false;
2111                 }
2112
2113                 // the current protocol version doesn't know these fields
2114                 // That means that we will assume their existance
2115                 if (isset($data->following)) {
2116                         $following = (unxmlify($data->following) == "true");
2117                 } else {
2118                         $following = true;
2119                 }
2120
2121                 if (isset($data->sharing)) {
2122                         $sharing = (unxmlify($data->sharing) == "true");
2123                 } else {
2124                         $sharing = true;
2125                 }
2126
2127                 $contact = self::contact_by_handle($importer["uid"],$author);
2128
2129                 // perhaps we were already sharing with this person. Now they're sharing with us.
2130                 // That makes us friends.
2131                 if ($contact) {
2132                         if ($following && $sharing) {
2133                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to have a bidirectional conection.", LOGGER_DEBUG);
2134                                 self::receive_request_make_friend($importer, $contact);
2135
2136                                 // refetch the contact array
2137                                 $contact = self::contact_by_handle($importer["uid"],$author);
2138
2139                                 // If we are now friends, we are sending a share message.
2140                                 // Normally we needn't to do so, but the first message could have been vanished.
2141                                 if (in_array($contact["rel"], array(CONTACT_IS_FRIEND, CONTACT_IS_FOLLOWER))) {
2142                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2143                                         if ($u) {
2144                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2145                                                 $ret = self::send_share($u[0], $contact);
2146                                         }
2147                                 }
2148                                 return true;
2149                         } else { /// @todo Handle all possible variations of adding and retracting of permissions
2150                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to change the relationship: Following: ".$following." - sharing: ".$sharing. "(By now unsupported)", LOGGER_DEBUG);
2151                                 return false;
2152                         }
2153                 }
2154
2155                 if (!$following && $sharing && in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
2156                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2157                         return false;
2158                 } elseif (!$following && !$sharing) {
2159                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2160                         return false;
2161                 } elseif (!$following && $sharing) {
2162                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2163                 } elseif ($following && $sharing) {
2164                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2165                 } elseif ($following && !$sharing) {
2166                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2167                 }
2168
2169                 $ret = self::person_by_handle($author);
2170
2171                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2172                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2173                         return false;
2174                 }
2175
2176                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2177
2178                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2179                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2180                         intval($importer["uid"]),
2181                         dbesc($ret["network"]),
2182                         dbesc($ret["addr"]),
2183                         datetime_convert(),
2184                         dbesc($ret["url"]),
2185                         dbesc(normalise_link($ret["url"])),
2186                         dbesc($batch),
2187                         dbesc($ret["name"]),
2188                         dbesc($ret["nick"]),
2189                         dbesc($ret["photo"]),
2190                         dbesc($ret["pubkey"]),
2191                         dbesc($ret["notify"]),
2192                         dbesc($ret["poll"]),
2193                         1,
2194                         2
2195                 );
2196
2197                 // find the contact record we just created
2198
2199                 $contact_record = self::contact_by_handle($importer["uid"],$author);
2200
2201                 if (!$contact_record) {
2202                         logger("unable to locate newly created contact record.");
2203                         return;
2204                 }
2205
2206                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2207
2208                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
2209
2210                 if (intval($def_gid))
2211                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
2212
2213                 update_contact_avatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2214
2215                 if ($importer["page-flags"] == PAGE_NORMAL) {
2216
2217                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2218
2219                         $hash = random_string().(string)time();   // Generate a confirm_key
2220
2221                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2222                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2223                                 intval($importer["uid"]),
2224                                 intval($contact_record["id"]),
2225                                 0,
2226                                 0,
2227                                 dbesc(t("Sharing notification from Diaspora network")),
2228                                 dbesc($hash),
2229                                 dbesc(datetime_convert())
2230                         );
2231                 } else {
2232
2233                         // automatic friend approval
2234
2235                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2236
2237                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
2238
2239                         // technically they are sharing with us (CONTACT_IS_SHARING),
2240                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2241                         // we are going to change the relationship and make them a follower.
2242
2243                         if (($importer["page-flags"] == PAGE_FREELOVE) && $sharing && $following)
2244                                 $new_relation = CONTACT_IS_FRIEND;
2245                         elseif (($importer["page-flags"] == PAGE_FREELOVE) && $sharing)
2246                                 $new_relation = CONTACT_IS_SHARING;
2247                         else
2248                                 $new_relation = CONTACT_IS_FOLLOWER;
2249
2250                         $r = q("UPDATE `contact` SET `rel` = %d,
2251                                 `name-date` = '%s',
2252                                 `uri-date` = '%s',
2253                                 `blocked` = 0,
2254                                 `pending` = 0,
2255                                 `writable` = 1
2256                                 WHERE `id` = %d
2257                                 ",
2258                                 intval($new_relation),
2259                                 dbesc(datetime_convert()),
2260                                 dbesc(datetime_convert()),
2261                                 intval($contact_record["id"])
2262                         );
2263
2264                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2265                         if ($u) {
2266                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2267                                 $ret = self::send_share($u[0], $contact_record);
2268
2269                                 // Send the profile data, maybe it weren't transmitted before
2270                                 self::send_profile($importer["uid"], array($contact_record));
2271                         }
2272                 }
2273
2274                 return true;
2275         }
2276
2277         /**
2278          * @brief Fetches a message with a given guid
2279          *
2280          * @param string $guid message guid
2281          * @param string $orig_author handle of the original post
2282          * @param string $author handle of the sharer
2283          *
2284          * @return array The fetched item
2285          */
2286         private static function original_item($guid, $orig_author, $author) {
2287
2288                 // Do we already have this item?
2289                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2290                                 `author-name`, `author-link`, `author-avatar`
2291                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2292                         dbesc($guid));
2293
2294                 if (dbm::is_result($r)) {
2295                         logger("reshared message ".$guid." already exists on system.");
2296
2297                         // Maybe it is already a reshared item?
2298                         // Then refetch the content, if it is a reshare from a reshare.
2299                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2300                         if (self::is_reshare($r[0]["body"], true)) {
2301                                 $r = array();
2302                         } elseif (self::is_reshare($r[0]["body"], false)) {
2303                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2304
2305                                 $r[0]["body"] = self::replace_people_guid($r[0]["body"], $r[0]["author-link"]);
2306
2307                                 // Add OEmbed and other information to the body
2308                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
2309
2310                                 return $r[0];
2311                         } else {
2312                                 return $r[0];
2313                         }
2314                 }
2315
2316                 if (!dbm::is_result($r)) {
2317                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2318                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2319                         $item_id = self::store_by_guid($guid, $server);
2320
2321                         if (!$item_id) {
2322                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2323                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
2324                                 $item_id = self::store_by_guid($guid, $server);
2325                         }
2326
2327                         if ($item_id) {
2328                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2329                                                 `author-name`, `author-link`, `author-avatar`
2330                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2331                                         intval($item_id));
2332
2333                                 if (dbm::is_result($r)) {
2334                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2335                                         if (self::is_reshare($r[0]["body"], false)) {
2336                                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2337                                                 $r[0]["body"] = self::replace_people_guid($r[0]["body"], $r[0]["author-link"]);
2338                                         }
2339
2340                                         return $r[0];
2341                                 }
2342
2343                         }
2344                 }
2345                 return false;
2346         }
2347
2348         /**
2349          * @brief Processes a reshare message
2350          *
2351          * @param array $importer Array of the importer user
2352          * @param object $data The message object
2353          * @param string $xml The original XML of the message
2354          *
2355          * @return int the message id
2356          */
2357         private static function receive_reshare($importer, $data, $xml) {
2358                 $author = notags(unxmlify($data->author));
2359                 $guid = notags(unxmlify($data->guid));
2360                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2361                 $root_author = notags(unxmlify($data->root_author));
2362                 $root_guid = notags(unxmlify($data->root_guid));
2363                 /// @todo handle unprocessed property "provider_display_name"
2364                 $public = notags(unxmlify($data->public));
2365
2366                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2367                 if (!$contact) {
2368                         return false;
2369                 }
2370
2371                 $message_id = self::message_exists($importer["uid"], $guid);
2372                 if ($message_id) {
2373                         return true;
2374                 }
2375
2376                 $original_item = self::original_item($root_guid, $root_author, $author);
2377                 if (!$original_item) {
2378                         return false;
2379                 }
2380
2381                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2382
2383                 $datarray = array();
2384
2385                 $datarray["uid"] = $importer["uid"];
2386                 $datarray["contact-id"] = $contact["id"];
2387                 $datarray["network"]  = NETWORK_DIASPORA;
2388
2389                 $datarray["author-name"] = $contact["name"];
2390                 $datarray["author-link"] = $contact["url"];
2391                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2392
2393                 $datarray["owner-name"] = $datarray["author-name"];
2394                 $datarray["owner-link"] = $datarray["author-link"];
2395                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2396
2397                 $datarray["guid"] = $guid;
2398                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2399
2400                 $datarray["verb"] = ACTIVITY_POST;
2401                 $datarray["gravity"] = GRAVITY_PARENT;
2402
2403                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2404                 $datarray["source"] = $xml;
2405
2406                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
2407                                         $original_item["guid"], $original_item["created"], $orig_url);
2408                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2409
2410                 $datarray["tag"] = $original_item["tag"];
2411                 $datarray["app"]  = $original_item["app"];
2412
2413                 $datarray["plink"] = self::plink($author, $guid);
2414                 $datarray["private"] = (($public == "false") ? 1 : 0);
2415                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2416
2417                 $datarray["object-type"] = $original_item["object-type"];
2418
2419                 self::fetch_guid($datarray);
2420                 $message_id = item_store($datarray);
2421
2422                 if ($message_id) {
2423                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2424                         return true;
2425                 } else {
2426                         return false;
2427                 }
2428         }
2429
2430         /**
2431          * @brief Processes retractions
2432          *
2433          * @param array $importer Array of the importer user
2434          * @param array $contact The contact of the item owner
2435          * @param object $data The message object
2436          *
2437          * @return bool success
2438          */
2439         private static function item_retraction($importer, $contact, $data) {
2440                 $author = notags(unxmlify($data->author));
2441                 $target_guid = notags(unxmlify($data->target_guid));
2442                 $target_type = notags(unxmlify($data->target_type));
2443
2444                 $person = self::person_by_handle($author);
2445                 if (!is_array($person)) {
2446                         logger("unable to find author detail for ".$author);
2447                         return false;
2448                 }
2449
2450                 if (!isset($contact["url"])) {
2451                         $contact["url"] = $person["url"];
2452                 }
2453
2454                 $r = q("SELECT `id`, `parent`, `parent-uri`, `author-link` FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
2455                         dbesc($target_guid),
2456                         intval($importer["uid"])
2457                 );
2458                 if (!$r) {
2459                         logger("Target guid ".$target_guid." was not found for user ".$importer["uid"]);
2460                         return false;
2461                 }
2462
2463                 // Check if the sender is the thread owner
2464                 $p = q("SELECT `id`, `author-link`, `origin` FROM `item` WHERE `id` = %d",
2465                         intval($r[0]["parent"]));
2466
2467                 // Only delete it if the parent author really fits
2468                 if (!link_compare($p[0]["author-link"], $contact["url"]) && !link_compare($r[0]["author-link"], $contact["url"])) {
2469                         logger("Thread author ".$p[0]["author-link"]." and item author ".$r[0]["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2470                         return false;
2471                 }
2472
2473                 // 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
2474                 dba::update('item', array('deleted' => true, 'title' => '', 'body' => '',
2475                                         'edited' => datetime_convert(), 'changed' => datetime_convert()),
2476                                 array('id' => $r[0]["id"]));
2477
2478                 delete_thread($r[0]["id"], $r[0]["parent-uri"]);
2479
2480                 logger("Deleted target ".$target_guid." (".$r[0]["id"].") from user ".$importer["uid"]." parent: ".$p[0]["id"], LOGGER_DEBUG);
2481
2482                 // Now check if the retraction needs to be relayed by us
2483                 if ($p[0]["origin"]) {
2484                         // notify others
2485                         proc_run(PRIORITY_HIGH, "include/notifier.php", "drop", $r[0]["id"]);
2486                 }
2487
2488                 return true;
2489         }
2490
2491         /**
2492          * @brief Receives retraction messages
2493          *
2494          * @param array $importer Array of the importer user
2495          * @param string $sender The sender of the message
2496          * @param object $data The message object
2497          *
2498          * @return bool Success
2499          */
2500         private static function receive_retraction($importer, $sender, $data) {
2501                 $target_type = notags(unxmlify($data->target_type));
2502
2503                 $contact = self::contact_by_handle($importer["uid"], $sender);
2504                 if (!$contact && (in_array($target_type, array("Contact", "Person")))) {
2505                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2506                         return false;
2507                 }
2508
2509                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2510
2511                 switch ($target_type) {
2512                         case "Comment":
2513                         case "Like":
2514                         case "Post":
2515                         case "Reshare":
2516                         case "StatusMessage":
2517                                 return self::item_retraction($importer, $contact, $data);
2518
2519                         case "Contact":
2520                         case "Person":
2521                                 /// @todo What should we do with an "unshare"?
2522                                 // Removing the contact isn't correct since we still can read the public items
2523                                 contact_remove($contact["id"]);
2524                                 return true;
2525
2526                         default:
2527                                 logger("Unknown target type ".$target_type);
2528                                 return false;
2529                 }
2530                 return true;
2531         }
2532
2533         /**
2534          * @brief Receives status messages
2535          *
2536          * @param array $importer Array of the importer user
2537          * @param object $data The message object
2538          * @param string $xml The original XML of the message
2539          *
2540          * @return int The message id of the newly created item
2541          */
2542         private static function receive_status_message($importer, $data, $xml) {
2543                 $author = notags(unxmlify($data->author));
2544                 $guid = notags(unxmlify($data->guid));
2545                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2546                 $public = notags(unxmlify($data->public));
2547                 $text = unxmlify($data->text);
2548                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2549
2550                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2551                 if (!$contact) {
2552                         return false;
2553                 }
2554
2555                 $message_id = self::message_exists($importer["uid"], $guid);
2556                 if ($message_id) {
2557                         return true;
2558                 }
2559
2560                 $address = array();
2561                 if ($data->location) {
2562                         foreach ($data->location->children() AS $fieldname => $data) {
2563                                 $address[$fieldname] = notags(unxmlify($data));
2564                         }
2565                 }
2566
2567                 $body = diaspora2bb($text);
2568
2569                 $datarray = array();
2570
2571                 // Attach embedded pictures to the body
2572                 if ($data->photo) {
2573                         foreach ($data->photo AS $photo) {
2574                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2575                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2576                         }
2577
2578                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2579                 } else {
2580                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2581
2582                         // Add OEmbed and other information to the body
2583                         if (!self::is_redmatrix($contact["url"])) {
2584                                 $body = add_page_info_to_body($body, false, true);
2585                         }
2586                 }
2587
2588                 /// @todo enable support for polls
2589                 //if ($data->poll) {
2590                 //      foreach ($data->poll AS $poll)
2591                 //              print_r($poll);
2592                 //      die("poll!\n");
2593                 //}
2594
2595                 /// @todo enable support for events
2596
2597                 $datarray["uid"] = $importer["uid"];
2598                 $datarray["contact-id"] = $contact["id"];
2599                 $datarray["network"] = NETWORK_DIASPORA;
2600
2601                 $datarray["author-name"] = $contact["name"];
2602                 $datarray["author-link"] = $contact["url"];
2603                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2604
2605                 $datarray["owner-name"] = $datarray["author-name"];
2606                 $datarray["owner-link"] = $datarray["author-link"];
2607                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2608
2609                 $datarray["guid"] = $guid;
2610                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2611
2612                 $datarray["verb"] = ACTIVITY_POST;
2613                 $datarray["gravity"] = GRAVITY_PARENT;
2614
2615                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2616                 $datarray["source"] = $xml;
2617
2618                 $datarray["body"] = self::replace_people_guid($body, $contact["url"]);
2619
2620                 if ($provider_display_name != "") {
2621                         $datarray["app"] = $provider_display_name;
2622                 }
2623
2624                 $datarray["plink"] = self::plink($author, $guid);
2625                 $datarray["private"] = (($public == "false") ? 1 : 0);
2626                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2627
2628                 if (isset($address["address"])) {
2629                         $datarray["location"] = $address["address"];
2630                 }
2631
2632                 if (isset($address["lat"]) && isset($address["lng"])) {
2633                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2634                 }
2635
2636                 self::fetch_guid($datarray);
2637                 $message_id = item_store($datarray);
2638
2639                 if ($message_id) {
2640                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2641                         return true;
2642                 } else {
2643                         return false;
2644                 }
2645         }
2646
2647         /* ************************************************************************************** *
2648          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2649          * ************************************************************************************** */
2650
2651         /**
2652          * @brief returnes the handle of a contact
2653          *
2654          * @param array $me contact array
2655          *
2656          * @return string the handle in the format user@domain.tld
2657          */
2658         private static function my_handle($contact) {
2659                 if ($contact["addr"] != "") {
2660                         return $contact["addr"];
2661                 }
2662
2663                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2664                 // So - just in case - we build the the address here.
2665                 if ($contact["nickname"] != "") {
2666                         $nick = $contact["nickname"];
2667                 } else {
2668                         $nick = $contact["nick"];
2669                 }
2670
2671                 return $nick."@".substr(System::baseUrl(), strpos(System::baseUrl(),"://") + 3);
2672         }
2673
2674
2675         /**
2676          * @brief Creates the data for a private message in the new format
2677          *
2678          * @param string $msg The message that is to be transmitted
2679          * @param array $user The record of the sender
2680          * @param array $contact Target of the communication
2681          * @param string $prvkey The private key of the sender
2682          * @param string $pubkey The public key of the receiver
2683          *
2684          * @return string The encrypted data
2685          */
2686         public static function encode_private_data($msg, $user, $contact, $prvkey, $pubkey) {
2687
2688                 logger("Message: ".$msg, LOGGER_DATA);
2689
2690                 // without a public key nothing will work
2691                 if (!$pubkey) {
2692                         logger("pubkey missing: contact id: ".$contact["id"]);
2693                         return false;
2694                 }
2695
2696                 $aes_key = openssl_random_pseudo_bytes(32);
2697                 $b_aes_key = base64_encode($aes_key);
2698                 $iv = openssl_random_pseudo_bytes(16);
2699                 $b_iv = base64_encode($iv);
2700
2701                 $ciphertext = self::aes_encrypt($aes_key, $iv, $msg);
2702
2703                 $json = json_encode(array("iv" => $b_iv, "key" => $b_aes_key));
2704
2705                 $encrypted_key_bundle = "";
2706                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
2707
2708                 $json_object = json_encode(array("aes_key" => base64_encode($encrypted_key_bundle),
2709                                                 "encrypted_magic_envelope" => base64_encode($ciphertext)));
2710
2711                 return $json_object;
2712         }
2713
2714         /**
2715          * @brief Creates the envelope for the "fetch" endpoint and for the new format
2716          *
2717          * @param string $msg The message that is to be transmitted
2718          * @param array $user The record of the sender
2719          *
2720          * @return string The envelope
2721          */
2722         public static function build_magic_envelope($msg, $user) {
2723
2724                 $b64url_data = base64url_encode($msg);
2725                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2726
2727                 $key_id = base64url_encode(self::my_handle($user));
2728                 $type = "application/xml";
2729                 $encoding = "base64url";
2730                 $alg = "RSA-SHA256";
2731                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2732
2733                 // Fallback if the private key wasn't transmitted in the expected field
2734                 if ($user['uprvkey'] == "")
2735                         $user['uprvkey'] = $user['prvkey'];
2736
2737                 $signature = rsa_sign($signable_data, $user["uprvkey"]);
2738                 $sig = base64url_encode($signature);
2739
2740                 $xmldata = array("me:env" => array("me:data" => $data,
2741                                                         "@attributes" => array("type" => $type),
2742                                                         "me:encoding" => $encoding,
2743                                                         "me:alg" => $alg,
2744                                                         "me:sig" => $sig,
2745                                                         "@attributes2" => array("key_id" => $key_id)));
2746
2747                 $namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
2748
2749                 return xml::from_array($xmldata, $xml, false, $namespaces);
2750         }
2751
2752         /**
2753          * @brief Create the envelope for a message
2754          *
2755          * @param string $msg The message that is to be transmitted
2756          * @param array $user The record of the sender
2757          * @param array $contact Target of the communication
2758          * @param string $prvkey The private key of the sender
2759          * @param string $pubkey The public key of the receiver
2760          * @param bool $public Is the message public?
2761          *
2762          * @return string The message that will be transmitted to other servers
2763          */
2764         private static function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
2765
2766                 // The message is put into an envelope with the sender's signature
2767                 $envelope = self::build_magic_envelope($msg, $user);
2768
2769                 // Private messages are put into a second envelope, encrypted with the receivers public key
2770                 if (!$public) {
2771                         $envelope = self::encode_private_data($envelope, $user, $contact, $prvkey, $pubkey);
2772                 }
2773
2774                 return $envelope;
2775         }
2776
2777         /**
2778          * @brief Creates a signature for a message
2779          *
2780          * @param array $owner the array of the owner of the message
2781          * @param array $message The message that is to be signed
2782          *
2783          * @return string The signature
2784          */
2785         private static function signature($owner, $message) {
2786                 $sigmsg = $message;
2787                 unset($sigmsg["author_signature"]);
2788                 unset($sigmsg["parent_author_signature"]);
2789
2790                 $signed_text = implode(";", $sigmsg);
2791
2792                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2793         }
2794
2795         /**
2796          * @brief Transmit a message to a target server
2797          *
2798          * @param array $owner the array of the item owner
2799          * @param array $contact Target of the communication
2800          * @param string $envelope The message that is to be transmitted
2801          * @param bool $public_batch Is it a public post?
2802          * @param bool $queue_run Is the transmission called from the queue?
2803          * @param string $guid message guid
2804          *
2805          * @return int Result of the transmission
2806          */
2807         public static function transmit($owner, $contact, $envelope, $public_batch, $queue_run=false, $guid = "") {
2808
2809                 $a = get_app();
2810
2811                 $enabled = intval(get_config("system", "diaspora_enabled"));
2812                 if (!$enabled)
2813                         return 200;
2814
2815                 $logid = random_string(4);
2816                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2817                 if (!$dest_url) {
2818                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2819                         return 0;
2820                 }
2821
2822                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2823
2824                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2825                         $return_code = 0;
2826                 } else {
2827                         if (!intval(get_config("system", "diaspora_test"))) {
2828                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
2829
2830                                 post_url($dest_url."/", $envelope, array("Content-Type: ".$content_type));
2831                                 $return_code = $a->get_curl_code();
2832                         } else {
2833                                 logger("test_mode");
2834                                 return 200;
2835                         }
2836                 }
2837
2838                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2839
2840                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2841                         logger("queue message");
2842
2843                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2844                                 intval($contact["id"]),
2845                                 dbesc(NETWORK_DIASPORA),
2846                                 dbesc($envelope),
2847                                 intval($public_batch)
2848                         );
2849                         if ($r) {
2850                                 logger("add_to_queue ignored - identical item already in queue");
2851                         } else {
2852                                 // queue message for redelivery
2853                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch);
2854
2855                                 // The message could not be delivered. We mark the contact as "dead"
2856                                 mark_for_death($contact);
2857                         }
2858                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
2859                         // We successfully delivered a message, the contact is alive
2860                         unmark_for_death($contact);
2861                 }
2862
2863                 return(($return_code) ? $return_code : (-1));
2864         }
2865
2866
2867         /**
2868          * @brief Build the post xml
2869          *
2870          * @param string $type The message type
2871          * @param array $message The message data
2872          *
2873          * @return string The post XML
2874          */
2875         public static function build_post_xml($type, $message) {
2876
2877                 $data = array($type => $message);
2878
2879                 return xml::from_array($data, $xml);
2880         }
2881
2882         /**
2883          * @brief Builds and transmit messages
2884          *
2885          * @param array $owner the array of the item owner
2886          * @param array $contact Target of the communication
2887          * @param string $type The message type
2888          * @param array $message The message data
2889          * @param bool $public_batch Is it a public post?
2890          * @param string $guid message guid
2891          * @param bool $spool Should the transmission be spooled or transmitted?
2892          *
2893          * @return int Result of the transmission
2894          */
2895         private static function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false) {
2896
2897                 $msg = self::build_post_xml($type, $message);
2898
2899                 logger('message: '.$msg, LOGGER_DATA);
2900                 logger('send guid '.$guid, LOGGER_DEBUG);
2901
2902                 // Fallback if the private key wasn't transmitted in the expected field
2903                 if ($owner['uprvkey'] == "")
2904                         $owner['uprvkey'] = $owner['prvkey'];
2905
2906                 $envelope = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
2907
2908                 if ($spool) {
2909                         add_to_queue($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch);
2910                         return true;
2911                 } else
2912                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
2913
2914                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
2915
2916                 return $return_code;
2917         }
2918
2919         /**
2920          * @brief Sends a "share" message
2921          *
2922          * @param array $owner the array of the item owner
2923          * @param array $contact Target of the communication
2924          *
2925          * @return int The result of the transmission
2926          */
2927         public static function send_share($owner, $contact) {
2928
2929                 /**
2930                  * @todo support the different possible combinations of "following" and "sharing"
2931                  * Currently, Diaspora only interprets the "sharing" field
2932                  *
2933                  * Before switching this code productive, we have to check all "send_share" calls if "rel" is set correctly
2934                  */
2935
2936                 /*
2937                 switch ($contact["rel"]) {
2938                         case CONTACT_IS_FRIEND:
2939                                 $following = true;
2940                                 $sharing = true;
2941                         case CONTACT_IS_SHARING:
2942                                 $following = false;
2943                                 $sharing = true;
2944                         case CONTACT_IS_FOLLOWER:
2945                                 $following = true;
2946                                 $sharing = false;
2947                 }
2948                 */
2949
2950                 $message = array("author" => self::my_handle($owner),
2951                                 "recipient" => $contact["addr"],
2952                                 "following" => "true",
2953                                 "sharing" => "true");
2954
2955                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
2956
2957                 return self::build_and_transmit($owner, $contact, "contact", $message);
2958         }
2959
2960         /**
2961          * @brief sends an "unshare"
2962          *
2963          * @param array $owner the array of the item owner
2964          * @param array $contact Target of the communication
2965          *
2966          * @return int The result of the transmission
2967          */
2968         public static function send_unshare($owner, $contact) {
2969
2970                 $message = array("author" => self::my_handle($owner),
2971                                 "recipient" => $contact["addr"],
2972                                 "following" => "false",
2973                                 "sharing" => "false");
2974
2975                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
2976
2977                 return self::build_and_transmit($owner, $contact, "contact", $message);
2978         }
2979
2980         /**
2981          * @brief Checks a message body if it is a reshare
2982          *
2983          * @param string $body The message body that is to be check
2984          * @param bool $complete Should it be a complete check or a simple check?
2985          *
2986          * @return array|bool Reshare details or "false" if no reshare
2987          */
2988         public static function is_reshare($body, $complete = true) {
2989                 $body = trim($body);
2990
2991                 // Skip if it isn't a pure repeated messages
2992                 // Does it start with a share?
2993                 if ((strpos($body, "[share") > 0) && $complete)
2994                         return(false);
2995
2996                 // Does it end with a share?
2997                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
2998                         return(false);
2999
3000                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
3001                 // Skip if there is no shared message in there
3002                 if ($body == $attributes)
3003                         return(false);
3004
3005                 // If we don't do the complete check we quit here
3006                 if (!$complete)
3007                         return true;
3008
3009                 $guid = "";
3010                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3011                 if ($matches[1] != "")
3012                         $guid = $matches[1];
3013
3014                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3015                 if ($matches[1] != "")
3016                         $guid = $matches[1];
3017
3018                 if ($guid != "") {
3019                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
3020                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
3021                         if ($r) {
3022                                 $ret= array();
3023                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
3024                                 $ret["root_guid"] = $guid;
3025                                 return($ret);
3026                         }
3027                 }
3028
3029                 $profile = "";
3030                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3031                 if ($matches[1] != "")
3032                         $profile = $matches[1];
3033
3034                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3035                 if ($matches[1] != "")
3036                         $profile = $matches[1];
3037
3038                 $ret= array();
3039
3040                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
3041                 if (($ret["root_handle"] == $profile) || ($ret["root_handle"] == ""))
3042                         return(false);
3043
3044                 $link = "";
3045                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
3046                 if ($matches[1] != "")
3047                         $link = $matches[1];
3048
3049                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
3050                 if ($matches[1] != "")
3051                         $link = $matches[1];
3052
3053                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
3054                 if (($ret["root_guid"] == $link) || (trim($ret["root_guid"]) == ""))
3055                         return(false);
3056
3057                 return($ret);
3058         }
3059
3060         /**
3061          * @brief Create an event array
3062          *
3063          * @param integer $event_id The id of the event
3064          *
3065          * @return array with event data
3066          */
3067         private static function build_event($event_id) {
3068
3069                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3070                 if (!dbm::is_result($r)) {
3071                         return array();
3072                 }
3073
3074                 $event = $r[0];
3075
3076                 $eventdata = array();
3077
3078                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3079                 if (!dbm::is_result($r)) {
3080                         return array();
3081                 }
3082
3083                 $user = $r[0];
3084
3085                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3086                 if (!dbm::is_result($r)) {
3087                         return array();
3088                 }
3089
3090                 $owner = $r[0];
3091
3092                 $eventdata['author'] = self::my_handle($owner);
3093
3094                 if ($event['guid']) {
3095                         $eventdata['guid'] = $event['guid'];
3096                 }
3097
3098                 $mask = 'Y-m-d\TH:i:s\Z';
3099
3100                 /// @todo - establish "all day" events in Friendica
3101                 $eventdata["all_day"] = "false";
3102
3103                 if (!$event['adjust']) {
3104                         $eventdata['timezone'] = $user['timezone'];
3105
3106                         if ($eventdata['timezone'] == "") {
3107                                 $eventdata['timezone'] = 'UTC';
3108                         }
3109                 }
3110
3111                 if ($event['start']) {
3112                         $eventdata['start'] = datetime_convert($eventdata['timezone'], "UTC", $event['start'], $mask);
3113                 }
3114                 if ($event['finish'] && !$event['nofinish']) {
3115                         $eventdata['end'] = datetime_convert($eventdata['timezone'], "UTC", $event['finish'], $mask);
3116                 }
3117                 if ($event['summary']) {
3118                         $eventdata['summary'] = html_entity_decode(bb2diaspora($event['summary']));
3119                 }
3120                 if ($event['desc']) {
3121                         $eventdata['description'] = html_entity_decode(bb2diaspora($event['desc']));
3122                 }
3123                 if ($event['location']) {
3124                         $location = array();
3125                         $location["address"] = html_entity_decode(bb2diaspora($event['location']));
3126                         $location["lat"] = 0;
3127                         $location["lng"] = 0;
3128                         $eventdata['location'] = $location;
3129                 }
3130
3131                 return $eventdata;
3132         }
3133
3134         /**
3135          * @brief Create a post (status message or reshare)
3136          *
3137          * @param array $item The item that will be exported
3138          * @param array $owner the array of the item owner
3139          *
3140          * @return array
3141          * 'type' -> Message type ("status_message" or "reshare")
3142          * 'message' -> Array of XML elements of the status
3143          */
3144         public static function build_status($item, $owner) {
3145
3146                 $cachekey = "diaspora:build_status:".$item['guid'];
3147
3148                 $result = Cache::get($cachekey);
3149                 if (!is_null($result)) {
3150                         return $result;
3151                 }
3152
3153                 $myaddr = self::my_handle($owner);
3154
3155                 $public = (($item["private"]) ? "false" : "true");
3156
3157                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3158
3159                 // Detect a share element and do a reshare
3160                 if (!$item['private'] && ($ret = self::is_reshare($item["body"]))) {
3161                         $message = array("author" => $myaddr,
3162                                         "guid" => $item["guid"],
3163                                         "created_at" => $created,
3164                                         "root_author" => $ret["root_handle"],
3165                                         "root_guid" => $ret["root_guid"],
3166                                         "provider_display_name" => $item["app"],
3167                                         "public" => $public);
3168
3169                         $type = "reshare";
3170                 } else {
3171                         $title = $item["title"];
3172                         $body = $item["body"];
3173
3174                         // convert to markdown
3175                         $body = html_entity_decode(bb2diaspora($body));
3176
3177                         // Adding the title
3178                         if (strlen($title))
3179                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3180
3181                         if ($item["attach"]) {
3182                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3183                                 if (cnt) {
3184                                         $body .= "\n".t("Attachments:")."\n";
3185                                         foreach ($matches as $mtch)
3186                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3187                                 }
3188                         }
3189
3190                         $location = array();
3191
3192                         if ($item["location"] != "")
3193                                 $location["address"] = $item["location"];
3194
3195                         if ($item["coord"] != "") {
3196                                 $coord = explode(" ", $item["coord"]);
3197                                 $location["lat"] = $coord[0];
3198                                 $location["lng"] = $coord[1];
3199                         }
3200
3201                         $message = array("author" => $myaddr,
3202                                         "guid" => $item["guid"],
3203                                         "created_at" => $created,
3204                                         "public" => $public,
3205                                         "text" => $body,
3206                                         "provider_display_name" => $item["app"],
3207                                         "location" => $location);
3208
3209                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3210                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3211                                 unset($message["location"]);
3212                         }
3213
3214                         if ($item['event-id'] > 0) {
3215                                 $event = self::build_event($item['event-id']);
3216                                 if (count($event)) {
3217                                         $message['event'] = $event;
3218
3219                                         /// @todo Once Diaspora supports it, we will remove the body
3220                                         // $message['text'] = '';
3221                                 }
3222                         }
3223
3224                         $type = "status_message";
3225                 }
3226
3227                 $msg = array("type" => $type, "message" => $message);
3228
3229                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3230
3231                 return $msg;
3232         }
3233
3234         /**
3235          * @brief Sends a post
3236          *
3237          * @param array $item The item that will be exported
3238          * @param array $owner the array of the item owner
3239          * @param array $contact Target of the communication
3240          * @param bool $public_batch Is it a public post?
3241          *
3242          * @return int The result of the transmission
3243          */
3244         public static function send_status($item, $owner, $contact, $public_batch = false) {
3245
3246                 $status = self::build_status($item, $owner);
3247
3248                 return self::build_and_transmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3249         }
3250
3251         /**
3252          * @brief Creates a "like" object
3253          *
3254          * @param array $item The item that will be exported
3255          * @param array $owner the array of the item owner
3256          *
3257          * @return array The data for a "like"
3258          */
3259         private static function construct_like($item, $owner) {
3260
3261                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3262                         dbesc($item["thr-parent"]));
3263                 if (!dbm::is_result($p))
3264                         return false;
3265
3266                 $parent = $p[0];
3267
3268                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3269                 if ($item['verb'] === ACTIVITY_LIKE) {
3270                         $positive = "true";
3271                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3272                         $positive = "false";
3273                 }
3274
3275                 return(array("author" => self::my_handle($owner),
3276                                 "guid" => $item["guid"],
3277                                 "parent_guid" => $parent["guid"],
3278                                 "parent_type" => $target_type,
3279                                 "positive" => $positive,
3280                                 "author_signature" => ""));
3281         }
3282
3283         /**
3284          * @brief Creates an "EventParticipation" object
3285          *
3286          * @param array $item The item that will be exported
3287          * @param array $owner the array of the item owner
3288          *
3289          * @return array The data for an "EventParticipation"
3290          */
3291         private static function construct_attend($item, $owner) {
3292
3293                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3294                         dbesc($item["thr-parent"]));
3295                 if (!dbm::is_result($p))
3296                         return false;
3297
3298                 $parent = $p[0];
3299
3300                 switch ($item['verb']) {
3301                         case ACTIVITY_ATTEND:
3302                                 $attend_answer = 'accepted';
3303                                 break;
3304                         case ACTIVITY_ATTENDNO:
3305                                 $attend_answer = 'declined';
3306                                 break;
3307                         case ACTIVITY_ATTENDMAYBE:
3308                                 $attend_answer = 'tentative';
3309                                 break;
3310                         default:
3311                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3312                                 return false;
3313                 }
3314
3315                 return(array("author" => self::my_handle($owner),
3316                                 "guid" => $item["guid"],
3317                                 "parent_guid" => $parent["guid"],
3318                                 "status" => $attend_answer,
3319                                 "author_signature" => ""));
3320         }
3321
3322         /**
3323          * @brief Creates the object for a comment
3324          *
3325          * @param array $item The item that will be exported
3326          * @param array $owner the array of the item owner
3327          *
3328          * @return array The data for a comment
3329          */
3330         private static function construct_comment($item, $owner) {
3331
3332                 $cachekey = "diaspora:construct_comment:".$item['guid'];
3333
3334                 $result = Cache::get($cachekey);
3335                 if (!is_null($result)) {
3336                         return $result;
3337                 }
3338
3339                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3340                         intval($item["parent"]),
3341                         intval($item["parent"])
3342                 );
3343
3344                 if (!dbm::is_result($p))
3345                         return false;
3346
3347                 $parent = $p[0];
3348
3349                 $text = html_entity_decode(bb2diaspora($item["body"]));
3350                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3351
3352                 $comment = array("author" => self::my_handle($owner),
3353                                 "guid" => $item["guid"],
3354                                 "created_at" => $created,
3355                                 "parent_guid" => $parent["guid"],
3356                                 "text" => $text,
3357                                 "author_signature" => "");
3358
3359                 // Send the thread parent guid only if it is a threaded comment
3360                 if ($item['thr-parent'] != $item['parent-uri']) {
3361                         $comment['thread_parent_guid'] = self::get_guid_from_uri($item['thr-parent'], $item['uid']);
3362                 }
3363
3364                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3365
3366                 return($comment);
3367         }
3368
3369         /**
3370          * @brief Send a like or a comment
3371          *
3372          * @param array $item The item that will be exported
3373          * @param array $owner the array of the item owner
3374          * @param array $contact Target of the communication
3375          * @param bool $public_batch Is it a public post?
3376          *
3377          * @return int The result of the transmission
3378          */
3379         public static function send_followup($item,$owner,$contact,$public_batch = false) {
3380
3381                 if (in_array($item['verb'], array(ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE))) {
3382                         $message = self::construct_attend($item, $owner);
3383                         $type = "event_participation";
3384                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3385                         $message = self::construct_like($item, $owner);
3386                         $type = "like";
3387                 } else {
3388                         $message = self::construct_comment($item, $owner);
3389                         $type = "comment";
3390                 }
3391
3392                 if (!$message)
3393                         return false;
3394
3395                 $message["author_signature"] = self::signature($owner, $message);
3396
3397                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3398         }
3399
3400         /**
3401          * @brief Creates a message from a signature record entry
3402          *
3403          * @param array $item The item that will be exported
3404          * @param array $signature The entry of the "sign" record
3405          *
3406          * @return string The message
3407          */
3408         private static function message_from_signature($item, $signature) {
3409
3410                 // Split the signed text
3411                 $signed_parts = explode(";", $signature['signed_text']);
3412
3413                 if ($item["deleted"])
3414                         $message = array("author" => $signature['signer'],
3415                                         "target_guid" => $signed_parts[0],
3416                                         "target_type" => $signed_parts[1]);
3417                 elseif ($item['verb'] === ACTIVITY_LIKE)
3418                         $message = array("author" => $signed_parts[4],
3419                                         "guid" => $signed_parts[1],
3420                                         "parent_guid" => $signed_parts[3],
3421                                         "parent_type" => $signed_parts[2],
3422                                         "positive" => $signed_parts[0],
3423                                         "author_signature" => $signature['signature'],
3424                                         "parent_author_signature" => "");
3425                 else {
3426                         // Remove the comment guid
3427                         $guid = array_shift($signed_parts);
3428
3429                         // Remove the parent guid
3430                         $parent_guid = array_shift($signed_parts);
3431
3432                         // Remove the handle
3433                         $handle = array_pop($signed_parts);
3434
3435                         // Glue the parts together
3436                         $text = implode(";", $signed_parts);
3437
3438                         $message = array("author" => $handle,
3439                                         "guid" => $guid,
3440                                         "parent_guid" => $parent_guid,
3441                                         "text" => implode(";", $signed_parts),
3442                                         "author_signature" => $signature['signature'],
3443                                         "parent_author_signature" => "");
3444                 }
3445                 return $message;
3446         }
3447
3448         /**
3449          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3450          *
3451          * @param array $item The item that will be exported
3452          * @param array $owner the array of the item owner
3453          * @param array $contact Target of the communication
3454          * @param bool $public_batch Is it a public post?
3455          *
3456          * @return int The result of the transmission
3457          */
3458         public static function send_relay($item, $owner, $contact, $public_batch = false) {
3459
3460                 if ($item["deleted"])
3461                         return self::send_retraction($item, $owner, $contact, $public_batch, true);
3462                 elseif ($item['verb'] === ACTIVITY_LIKE)
3463                         $type = "like";
3464                 else
3465                         $type = "comment";
3466
3467                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3468
3469                 // fetch the original signature
3470
3471                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3472                         intval($item["id"]));
3473
3474                 if (!$r) {
3475                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3476                         return false;
3477                 }
3478
3479                 $signature = $r[0];
3480
3481                 // Old way - is used by the internal Friendica functions
3482                 /// @todo Change all signatur storing functions to the new format
3483                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer'])
3484                         $message = self::message_from_signature($item, $signature);
3485                 else {// New way
3486                         $msg = json_decode($signature['signed_text'], true);
3487
3488                         $message = array();
3489                         if (is_array($msg)) {
3490                                 foreach ($msg AS $field => $data) {
3491                                         if (!$item["deleted"]) {
3492                                                 if ($field == "diaspora_handle") {
3493                                                         $field = "author";
3494                                                 }
3495                                                 if ($field == "target_type") {
3496                                                         $field = "parent_type";
3497                                                 }
3498                                         }
3499
3500                                         $message[$field] = $data;
3501                                 }
3502                         } else
3503                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3504                 }
3505
3506                 $message["parent_author_signature"] = self::signature($owner, $message);
3507
3508                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3509
3510                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3511         }
3512
3513         /**
3514          * @brief Sends a retraction (deletion) of a message, like or comment
3515          *
3516          * @param array $item The item that will be exported
3517          * @param array $owner the array of the item owner
3518          * @param array $contact Target of the communication
3519          * @param bool $public_batch Is it a public post?
3520          * @param bool $relay Is the retraction transmitted from a relay?
3521          *
3522          * @return int The result of the transmission
3523          */
3524         public static function send_retraction($item, $owner, $contact, $public_batch = false, $relay = false) {
3525
3526                 $itemaddr = self::handle_from_contact($item["contact-id"], $item["gcontact-id"]);
3527
3528                 $msg_type = "retraction";
3529                 $target_type = "Post";
3530
3531                 $message = array("author" => $itemaddr,
3532                                 "target_guid" => $item['guid'],
3533                                 "target_type" => $target_type);
3534
3535                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3536
3537                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3538         }
3539
3540         /**
3541          * @brief Sends a mail
3542          *
3543          * @param array $item The item that will be exported
3544          * @param array $owner The owner
3545          * @param array $contact Target of the communication
3546          *
3547          * @return int The result of the transmission
3548          */
3549         public static function send_mail($item, $owner, $contact) {
3550
3551                 $myaddr = self::my_handle($owner);
3552
3553                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3554                         intval($item["convid"]),
3555                         intval($item["uid"])
3556                 );
3557
3558                 if (!dbm::is_result($r)) {
3559                         logger("conversation not found.");
3560                         return;
3561                 }
3562                 $cnv = $r[0];
3563
3564                 $conv = array(
3565                         "author" => $cnv["creator"],
3566                         "guid" => $cnv["guid"],
3567                         "subject" => $cnv["subject"],
3568                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3569                         "participants" => $cnv["recips"]
3570                 );
3571
3572                 $body = bb2diaspora($item["body"]);
3573                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3574
3575                 $msg = array(
3576                         "author" => $myaddr,
3577                         "guid" => $item["guid"],
3578                         "conversation_guid" => $cnv["guid"],
3579                         "text" => $body,
3580                         "created_at" => $created,
3581                 );
3582
3583                 if ($item["reply"]) {
3584                         $message = $msg;
3585                         $type = "message";
3586                 } else {
3587                         $message = array(
3588                                         "author" => $cnv["creator"],
3589                                         "guid" => $cnv["guid"],
3590                                         "subject" => $cnv["subject"],
3591                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3592                                         "participants" => $cnv["recips"],
3593                                         "message" => $msg);
3594
3595                         $type = "conversation";
3596                 }
3597
3598                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
3599         }
3600
3601         /**
3602          * @brief Sends profile data
3603          *
3604          * @param int $uid The user id
3605          */
3606         public static function send_profile($uid, $recips = false) {
3607
3608                 if (!$uid)
3609                         return;
3610
3611                 if (!$recips)
3612                         $recips = q("SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3613                                 AND `uid` = %d AND `rel` != %d",
3614                                 dbesc(NETWORK_DIASPORA),
3615                                 intval($uid),
3616                                 intval(CONTACT_IS_SHARING)
3617                         );
3618                 if (!$recips)
3619                         return;
3620
3621                 $r = q("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3622                         FROM `profile`
3623                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3624                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3625                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3626                         intval($uid)
3627                 );
3628
3629                 if (!$r)
3630                         return;
3631
3632                 $profile = $r[0];
3633
3634                 $handle = $profile["addr"];
3635                 $first = ((strpos($profile['name'],' ')
3636                         ? trim(substr($profile['name'],0,strpos($profile['name'],' '))) : $profile['name']));
3637                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3638                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3639                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3640                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3641                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
3642
3643                 if ($searchable === 'true') {
3644                         $dob = '1000-00-00';
3645
3646                         if (($profile['dob']) && ($profile['dob'] > '0001-01-01'))
3647                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC','UTC',$profile['dob'],'m-d');
3648
3649                         $about = $profile['about'];
3650                         $about = strip_tags(bbcode($about));
3651
3652                         $location = formatted_location($profile);
3653                         $tags = '';
3654                         if ($profile['pub_keywords']) {
3655                                 $kw = str_replace(',',' ',$profile['pub_keywords']);
3656                                 $kw = str_replace('  ',' ',$kw);
3657                                 $arr = explode(' ',$profile['pub_keywords']);
3658                                 if (count($arr)) {
3659                                         for ($x = 0; $x < 5; $x ++) {
3660                                                 if (trim($arr[$x]))
3661                                                         $tags .= '#'. trim($arr[$x]) .' ';
3662                                         }
3663                                 }
3664                         }
3665                         $tags = trim($tags);
3666                 }
3667
3668                 $message = array("author" => $handle,
3669                                 "first_name" => $first,
3670                                 "last_name" => $last,
3671                                 "image_url" => $large,
3672                                 "image_url_medium" => $medium,
3673                                 "image_url_small" => $small,
3674                                 "birthday" => $dob,
3675                                 "gender" => $profile['gender'],
3676                                 "bio" => $about,
3677                                 "location" => $location,
3678                                 "searchable" => $searchable,
3679                                 "nsfw" => "false",
3680                                 "tag_string" => $tags);
3681
3682                 foreach ($recips as $recip) {
3683                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
3684                         self::build_and_transmit($profile, $recip, "profile", $message, false, "", true);
3685                 }
3686         }
3687
3688         /**
3689          * @brief Stores the signature for likes that are created on our system
3690          *
3691          * @param array $contact The contact array of the "like"
3692          * @param int $post_id The post id of the "like"
3693          *
3694          * @return bool Success
3695          */
3696         public static function store_like_signature($contact, $post_id) {
3697
3698                 // Is the contact the owner? Then fetch the private key
3699                 if (!$contact['self'] || ($contact['uid'] == 0)) {
3700                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
3701                         return false;
3702                 }
3703
3704                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
3705                 if (!dbm::is_result($r)) {
3706                         return false;
3707                 }
3708
3709                 $contact["uprvkey"] = $r[0]['prvkey'];
3710
3711                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
3712                 if (!dbm::is_result($r)) {
3713                         return false;
3714                 }
3715
3716                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3717                         return false;
3718                 }
3719
3720                 $message = self::construct_like($r[0], $contact);
3721                 $message["author_signature"] = self::signature($contact, $message);
3722
3723                 /*
3724                  * Now store the signature more flexible to dynamically support new fields.
3725                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
3726                  */
3727                 dba::insert('sign', array('iid' => $post_id, 'signed_text' => json_encode($message)));
3728
3729                 logger('Stored diaspora like signature');
3730                 return true;
3731         }
3732
3733         /**
3734          * @brief Stores the signature for comments that are created on our system
3735          *
3736          * @param array $item The item array of the comment
3737          * @param array $contact The contact array of the item owner
3738          * @param string $uprvkey The private key of the sender
3739          * @param int $message_id The message id of the comment
3740          *
3741          * @return bool Success
3742          */
3743         public static function store_comment_signature($item, $contact, $uprvkey, $message_id) {
3744
3745                 if ($uprvkey == "") {
3746                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
3747                         return false;
3748                 }
3749
3750                 $contact["uprvkey"] = $uprvkey;
3751
3752                 $message = self::construct_comment($item, $contact);
3753                 $message["author_signature"] = self::signature($contact, $message);
3754
3755                 /*
3756                  * Now store the signature more flexible to dynamically support new fields.
3757                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
3758                  */
3759                 dba::insert('sign', array('iid' => $message_id, 'signed_text' => json_encode($message)));
3760
3761                 logger('Stored diaspora comment signature');
3762                 return true;
3763         }
3764 }