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