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 && $parent_item["origin"]) {
1475
1476                         // Formerly we stored the signed text, the signature and the author in different fields.
1477                         // We now store the raw data so that we are more flexible.
1478                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1479                                 intval($message_id),
1480                                 dbesc(json_encode($data))
1481                         );
1482
1483                         // notify others
1484                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1485                 }
1486
1487                 return true;
1488         }
1489
1490         /**
1491          * @brief processes and stores private messages
1492          *
1493          * @param array $importer Array of the importer user
1494          * @param array $contact The contact of the message
1495          * @param object $data The message object
1496          * @param array $msg Array of the processed message, author handle and key
1497          * @param object $mesg The private message
1498          * @param array $conversation The conversation record to which this message belongs
1499          *
1500          * @return bool "true" if it was successful
1501          */
1502         private static function receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation) {
1503                 $author = notags(unxmlify($data->author));
1504                 $guid = notags(unxmlify($data->guid));
1505                 $subject = notags(unxmlify($data->subject));
1506
1507                 // "diaspora_handle" is the element name from the old version
1508                 // "author" is the element name from the new version
1509                 if ($mesg->author) {
1510                         $msg_author = notags(unxmlify($mesg->author));
1511                 } elseif ($mesg->diaspora_handle) {
1512                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1513                 } else {
1514                         return false;
1515                 }
1516
1517                 $msg_guid = notags(unxmlify($mesg->guid));
1518                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1519                 $msg_text = unxmlify($mesg->text);
1520                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1521
1522                 if ($msg_conversation_guid != $guid) {
1523                         logger("message conversation guid does not belong to the current conversation.");
1524                         return false;
1525                 }
1526
1527                 $body = diaspora2bb($msg_text);
1528                 $message_uri = $msg_author.":".$msg_guid;
1529
1530                 $person = self::person_by_handle($msg_author);
1531
1532                 $r = q("SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1533                         dbesc($msg_guid),
1534                         intval($importer["uid"])
1535                 );
1536                 if (dbm::is_result($r)) {
1537                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1538                         return false;
1539                 }
1540
1541                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1542                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1543                         intval($importer["uid"]),
1544                         dbesc($msg_guid),
1545                         intval($conversation["id"]),
1546                         dbesc($person["name"]),
1547                         dbesc($person["photo"]),
1548                         dbesc($person["url"]),
1549                         intval($contact["id"]),
1550                         dbesc($subject),
1551                         dbesc($body),
1552                         0,
1553                         0,
1554                         dbesc($message_uri),
1555                         dbesc($author.":".$guid),
1556                         dbesc($msg_created_at)
1557                 );
1558
1559                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1560                         dbesc(datetime_convert()),
1561                         intval($conversation["id"])
1562                 );
1563
1564                 notification(array(
1565                         "type" => NOTIFY_MAIL,
1566                         "notify_flags" => $importer["notify-flags"],
1567                         "language" => $importer["language"],
1568                         "to_name" => $importer["username"],
1569                         "to_email" => $importer["email"],
1570                         "uid" =>$importer["uid"],
1571                         "item" => array("subject" => $subject, "body" => $body),
1572                         "source_name" => $person["name"],
1573                         "source_link" => $person["url"],
1574                         "source_photo" => $person["thumb"],
1575                         "verb" => ACTIVITY_POST,
1576                         "otype" => "mail"
1577                 ));
1578                 return true;
1579         }
1580
1581         /**
1582          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1583          *
1584          * @param array $importer Array of the importer user
1585          * @param array $msg Array of the processed message, author handle and key
1586          * @param object $data The message object
1587          *
1588          * @return bool Success
1589          */
1590         private static function receive_conversation($importer, $msg, $data) {
1591                 $author = notags(unxmlify($data->author));
1592                 $guid = notags(unxmlify($data->guid));
1593                 $subject = notags(unxmlify($data->subject));
1594                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1595                 $participants = notags(unxmlify($data->participants));
1596
1597                 $messages = $data->message;
1598
1599                 if (!count($messages)) {
1600                         logger("empty conversation");
1601                         return false;
1602                 }
1603
1604                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1605                 if (!$contact)
1606                         return false;
1607
1608                 $conversation = null;
1609
1610                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1611                         intval($importer["uid"]),
1612                         dbesc($guid)
1613                 );
1614                 if ($c)
1615                         $conversation = $c[0];
1616                 else {
1617                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1618                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1619                                 intval($importer["uid"]),
1620                                 dbesc($guid),
1621                                 dbesc($author),
1622                                 dbesc($created_at),
1623                                 dbesc(datetime_convert()),
1624                                 dbesc($subject),
1625                                 dbesc($participants)
1626                         );
1627                         if ($r)
1628                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1629                                         intval($importer["uid"]),
1630                                         dbesc($guid)
1631                                 );
1632
1633                         if ($c)
1634                                 $conversation = $c[0];
1635                 }
1636                 if (!$conversation) {
1637                         logger("unable to create conversation.");
1638                         return false;
1639                 }
1640
1641                 foreach ($messages as $mesg)
1642                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation);
1643
1644                 return true;
1645         }
1646
1647         /**
1648          * @brief Creates the body for a "like" message
1649          *
1650          * @param array $contact The contact that send us the "like"
1651          * @param array $parent_item The item array of the parent item
1652          * @param string $guid message guid
1653          *
1654          * @return string the body
1655          */
1656         private static function construct_like_body($contact, $parent_item, $guid) {
1657                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1658
1659                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1660                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1661                 $plink = "[url=".App::get_baseurl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1662
1663                 return sprintf($bodyverb, $ulink, $alink, $plink);
1664         }
1665
1666         /**
1667          * @brief Creates a XML object for a "like"
1668          *
1669          * @param array $importer Array of the importer user
1670          * @param array $parent_item The item array of the parent item
1671          *
1672          * @return string The XML
1673          */
1674         private static function construct_like_object($importer, $parent_item) {
1675                 $objtype = ACTIVITY_OBJ_NOTE;
1676                 $link = '<link rel="alternate" type="text/html" href="'.App::get_baseurl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1677                 $parent_body = $parent_item["body"];
1678
1679                 $xmldata = array("object" => array("type" => $objtype,
1680                                                 "local" => "1",
1681                                                 "id" => $parent_item["uri"],
1682                                                 "link" => $link,
1683                                                 "title" => "",
1684                                                 "content" => $parent_body));
1685
1686                 return xml::from_array($xmldata, $xml, true);
1687         }
1688
1689         /**
1690          * @brief Processes "like" messages
1691          *
1692          * @param array $importer Array of the importer user
1693          * @param string $sender The sender of the message
1694          * @param object $data The message object
1695          *
1696          * @return int The message id of the generated like or "false" if there was an error
1697          */
1698         private static function receive_like($importer, $sender, $data) {
1699                 $author = notags(unxmlify($data->author));
1700                 $guid = notags(unxmlify($data->guid));
1701                 $parent_guid = notags(unxmlify($data->parent_guid));
1702                 $parent_type = notags(unxmlify($data->parent_type));
1703                 $positive = notags(unxmlify($data->positive));
1704
1705                 // likes on comments aren't supported by Diaspora - only on posts
1706                 // But maybe this will be supported in the future, so we will accept it.
1707                 if (!in_array($parent_type, array("Post", "Comment")))
1708                         return false;
1709
1710                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1711                 if (!$contact)
1712                         return false;
1713
1714                 $message_id = self::message_exists($importer["uid"], $guid);
1715                 if ($message_id)
1716                         return true;
1717
1718                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1719                 if (!$parent_item)
1720                         return false;
1721
1722                 $person = self::person_by_handle($author);
1723                 if (!is_array($person)) {
1724                         logger("unable to find author details");
1725                         return false;
1726                 }
1727
1728                 // Fetch the contact id - if we know this contact
1729                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1730
1731                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1732                 // We would accept this anyhow.
1733                 if ($positive == "true")
1734                         $verb = ACTIVITY_LIKE;
1735                 else
1736                         $verb = ACTIVITY_DISLIKE;
1737
1738                 $datarray = array();
1739
1740                 $datarray["protocol"] = PROTOCOL_DIASPORA;
1741
1742                 $datarray["uid"] = $importer["uid"];
1743                 $datarray["contact-id"] = $author_contact["cid"];
1744                 $datarray["network"]  = $author_contact["network"];
1745
1746                 $datarray["author-name"] = $person["name"];
1747                 $datarray["author-link"] = $person["url"];
1748                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1749
1750                 $datarray["owner-name"] = $contact["name"];
1751                 $datarray["owner-link"] = $contact["url"];
1752                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1753
1754                 $datarray["guid"] = $guid;
1755                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1756
1757                 $datarray["type"] = "activity";
1758                 $datarray["verb"] = $verb;
1759                 $datarray["gravity"] = GRAVITY_LIKE;
1760                 $datarray["parent-uri"] = $parent_item["uri"];
1761
1762                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1763                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1764
1765                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1766
1767                 $message_id = item_store($datarray);
1768
1769                 if ($message_id <= 0) {
1770                         return false;
1771                 }
1772
1773                 if ($message_id) {
1774                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1775                 }
1776
1777                 // If we are the origin of the parent we store the original data and notify our followers
1778                 if ($message_id && $parent_item["origin"]) {
1779
1780                         // Formerly we stored the signed text, the signature and the author in different fields.
1781                         // We now store the raw data so that we are more flexible.
1782                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1783                                 intval($message_id),
1784                                 dbesc(json_encode($data))
1785                         );
1786
1787                         // notify others
1788                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1789                 }
1790
1791                 return true;
1792         }
1793
1794         /**
1795          * @brief Processes private messages
1796          *
1797          * @param array $importer Array of the importer user
1798          * @param object $data The message object
1799          *
1800          * @return bool Success?
1801          */
1802         private static function receive_message($importer, $data) {
1803                 $author = notags(unxmlify($data->author));
1804                 $guid = notags(unxmlify($data->guid));
1805                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1806                 $text = unxmlify($data->text);
1807                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1808
1809                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1810                 if (!$contact) {
1811                         return false;
1812                 }
1813
1814                 $conversation = null;
1815
1816                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1817                         intval($importer["uid"]),
1818                         dbesc($conversation_guid)
1819                 );
1820                 if ($c) {
1821                         $conversation = $c[0];
1822                 } else {
1823                         logger("conversation not available.");
1824                         return false;
1825                 }
1826
1827                 $message_uri = $author.":".$guid;
1828
1829                 $person = self::person_by_handle($author);
1830                 if (!$person) {
1831                         logger("unable to find author details");
1832                         return false;
1833                 }
1834
1835                 $r = q("SELECT `id` FROM `mail` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
1836                         dbesc($guid),
1837                         intval($importer["uid"])
1838                 );
1839                 if (dbm::is_result($r)) {
1840                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1841                         return false;
1842                 }
1843
1844                 $body = diaspora2bb($text);
1845
1846                 $body = self::replace_people_guid($body, $person["url"]);
1847
1848                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1849                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1850                         intval($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                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1867                         dbesc(datetime_convert()),
1868                         intval($conversation["id"])
1869                 );
1870
1871                 return true;
1872         }
1873
1874         /**
1875          * @brief Processes participations - unsupported by now
1876          *
1877          * @param array $importer Array of the importer user
1878          * @param object $data The message object
1879          *
1880          * @return bool always true
1881          */
1882         private static function receive_participation($importer, $data) {
1883                 // I'm not sure if we can fully support this message type
1884                 return true;
1885         }
1886
1887         /**
1888          * @brief Processes photos - unneeded
1889          *
1890          * @param array $importer Array of the importer user
1891          * @param object $data The message object
1892          *
1893          * @return bool always true
1894          */
1895         private static function receive_photo($importer, $data) {
1896                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
1897                 return true;
1898         }
1899
1900         /**
1901          * @brief Processes poll participations - unssupported
1902          *
1903          * @param array $importer Array of the importer user
1904          * @param object $data The message object
1905          *
1906          * @return bool always true
1907          */
1908         private static function receive_poll_participation($importer, $data) {
1909                 // We don't support polls by now
1910                 return true;
1911         }
1912
1913         /**
1914          * @brief Processes incoming profile updates
1915          *
1916          * @param array $importer Array of the importer user
1917          * @param object $data The message object
1918          *
1919          * @return bool Success
1920          */
1921         private static function receive_profile($importer, $data) {
1922                 $author = strtolower(notags(unxmlify($data->author)));
1923
1924                 $contact = self::contact_by_handle($importer["uid"], $author);
1925                 if (!$contact)
1926                         return false;
1927
1928                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
1929                 $image_url = unxmlify($data->image_url);
1930                 $birthday = unxmlify($data->birthday);
1931                 $gender = unxmlify($data->gender);
1932                 $about = diaspora2bb(unxmlify($data->bio));
1933                 $location = diaspora2bb(unxmlify($data->location));
1934                 $searchable = (unxmlify($data->searchable) == "true");
1935                 $nsfw = (unxmlify($data->nsfw) == "true");
1936                 $tags = unxmlify($data->tag_string);
1937
1938                 $tags = explode("#", $tags);
1939
1940                 $keywords = array();
1941                 foreach ($tags as $tag) {
1942                         $tag = trim(strtolower($tag));
1943                         if ($tag != "")
1944                                 $keywords[] = $tag;
1945                 }
1946
1947                 $keywords = implode(", ", $keywords);
1948
1949                 $handle_parts = explode("@", $author);
1950                 $nick = $handle_parts[0];
1951
1952                 if ($name === "")
1953                         $name = $handle_parts[0];
1954
1955                 if ( preg_match("|^https?://|", $image_url) === 0)
1956                         $image_url = "http://".$handle_parts[1].$image_url;
1957
1958                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
1959
1960                 // Generic birthday. We don't know the timezone. The year is irrelevant.
1961
1962                 $birthday = str_replace("1000", "1901", $birthday);
1963
1964                 if ($birthday != "")
1965                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
1966
1967                 // this is to prevent multiple birthday notifications in a single year
1968                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
1969
1970                 if (substr($birthday,5) === substr($contact["bd"],5))
1971                         $birthday = $contact["bd"];
1972
1973                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
1974                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
1975                         dbesc($name),
1976                         dbesc($nick),
1977                         dbesc($author),
1978                         dbesc(datetime_convert()),
1979                         dbesc($birthday),
1980                         dbesc($location),
1981                         dbesc($about),
1982                         dbesc($keywords),
1983                         dbesc($gender),
1984                         intval($contact["id"]),
1985                         intval($importer["uid"])
1986                 );
1987
1988                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
1989                                         "photo" => $image_url, "name" => $name, "location" => $location,
1990                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
1991                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
1992                                         "hide" => !$searchable, "nsfw" => $nsfw);
1993
1994                 $gcid = update_gcontact($gcontact);
1995
1996                 link_gcontact($gcid, $importer["uid"], $contact["id"]);
1997
1998                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
1999
2000                 return true;
2001         }
2002
2003         /**
2004          * @brief Processes incoming friend requests
2005          *
2006          * @param array $importer Array of the importer user
2007          * @param array $contact The contact that send the request
2008          */
2009         private static function receive_request_make_friend($importer, $contact) {
2010
2011                 $a = get_app();
2012
2013                 if ($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
2014                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
2015                                 intval(CONTACT_IS_FRIEND),
2016                                 intval($contact["id"]),
2017                                 intval($importer["uid"])
2018                         );
2019                 }
2020                 // send notification
2021
2022                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
2023                         intval($importer["uid"])
2024                 );
2025
2026                 if ($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(get_pconfig($importer["uid"], "system", "post_newfriend"))) {
2027
2028                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
2029                                 intval($importer["uid"])
2030                         );
2031
2032                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
2033
2034                         if ($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
2035
2036                                 $arr = array();
2037                                 $arr["protocol"] = PROTOCOL_DIASPORA;
2038                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
2039                                 $arr["uid"] = $importer["uid"];
2040                                 $arr["contact-id"] = $self[0]["id"];
2041                                 $arr["wall"] = 1;
2042                                 $arr["type"] = 'wall';
2043                                 $arr["gravity"] = 0;
2044                                 $arr["origin"] = 1;
2045                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
2046                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
2047                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
2048                                 $arr["verb"] = ACTIVITY_FRIEND;
2049                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
2050
2051                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
2052                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
2053                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
2054                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
2055
2056                                 $arr["object"] = self::construct_new_friend_object($contact);
2057
2058                                 $arr["last-child"] = 1;
2059
2060                                 $arr["allow_cid"] = $user[0]["allow_cid"];
2061                                 $arr["allow_gid"] = $user[0]["allow_gid"];
2062                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
2063                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
2064
2065                                 $i = item_store($arr);
2066                                 if ($i)
2067                                         proc_run(PRIORITY_HIGH, "include/notifier.php", "activity", $i);
2068                         }
2069                 }
2070         }
2071
2072         /**
2073          * @brief Creates a XML object for a "new friend" message
2074          *
2075          * @param array $contact Array of the contact
2076          *
2077          * @return string The XML
2078          */
2079         private static function construct_new_friend_object($contact) {
2080                 $objtype = ACTIVITY_OBJ_PERSON;
2081                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
2082                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
2083
2084                 $xmldata = array("object" => array("type" => $objtype,
2085                                                 "title" => $contact["name"],
2086                                                 "id" => $contact["url"]."/".$contact["name"],
2087                                                 "link" => $link));
2088
2089                 return xml::from_array($xmldata, $xml, true);
2090         }
2091
2092         /**
2093          * @brief Processes incoming sharing notification
2094          *
2095          * @param array $importer Array of the importer user
2096          * @param object $data The message object
2097          *
2098          * @return bool Success
2099          */
2100         private static function receive_contact_request($importer, $data) {
2101                 $author = unxmlify($data->author);
2102                 $recipient = unxmlify($data->recipient);
2103
2104                 if (!$author || !$recipient) {
2105                         return false;
2106                 }
2107
2108                 // the current protocol version doesn't know these fields
2109                 // That means that we will assume their existance
2110                 if (isset($data->following)) {
2111                         $following = (unxmlify($data->following) == "true");
2112                 } else {
2113                         $following = true;
2114                 }
2115
2116                 if (isset($data->sharing)) {
2117                         $sharing = (unxmlify($data->sharing) == "true");
2118                 } else {
2119                         $sharing = true;
2120                 }
2121
2122                 $contact = self::contact_by_handle($importer["uid"],$author);
2123
2124                 // perhaps we were already sharing with this person. Now they're sharing with us.
2125                 // That makes us friends.
2126                 if ($contact) {
2127                         if ($following && $sharing) {
2128                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to have a bidirectional conection.", LOGGER_DEBUG);
2129                                 self::receive_request_make_friend($importer, $contact);
2130
2131                                 // refetch the contact array
2132                                 $contact = self::contact_by_handle($importer["uid"],$author);
2133
2134                                 // If we are now friends, we are sending a share message.
2135                                 // Normally we needn't to do so, but the first message could have been vanished.
2136                                 if (in_array($contact["rel"], array(CONTACT_IS_FRIEND, CONTACT_IS_FOLLOWER))) {
2137                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2138                                         if ($u) {
2139                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2140                                                 $ret = self::send_share($u[0], $contact);
2141                                         }
2142                                 }
2143                                 return true;
2144                         } else { /// @todo Handle all possible variations of adding and retracting of permissions
2145                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to change the relationship: Following: ".$following." - sharing: ".$sharing. "(By now unsupported)", LOGGER_DEBUG);
2146                                 return false;
2147                         }
2148                 }
2149
2150                 if (!$following && $sharing && in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
2151                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
2152                         return false;
2153                 } elseif (!$following && !$sharing) {
2154                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
2155                         return false;
2156                 } elseif (!$following && $sharing) {
2157                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
2158                 } elseif ($following && $sharing) {
2159                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
2160                 } elseif ($following && !$sharing) {
2161                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
2162                 }
2163
2164                 $ret = self::person_by_handle($author);
2165
2166                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
2167                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
2168                         return false;
2169                 }
2170
2171                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2172
2173                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2174                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2175                         intval($importer["uid"]),
2176                         dbesc($ret["network"]),
2177                         dbesc($ret["addr"]),
2178                         datetime_convert(),
2179                         dbesc($ret["url"]),
2180                         dbesc(normalise_link($ret["url"])),
2181                         dbesc($batch),
2182                         dbesc($ret["name"]),
2183                         dbesc($ret["nick"]),
2184                         dbesc($ret["photo"]),
2185                         dbesc($ret["pubkey"]),
2186                         dbesc($ret["notify"]),
2187                         dbesc($ret["poll"]),
2188                         1,
2189                         2
2190                 );
2191
2192                 // find the contact record we just created
2193
2194                 $contact_record = self::contact_by_handle($importer["uid"],$author);
2195
2196                 if (!$contact_record) {
2197                         logger("unable to locate newly created contact record.");
2198                         return;
2199                 }
2200
2201                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
2202
2203                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
2204
2205                 if (intval($def_gid))
2206                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
2207
2208                 update_contact_avatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2209
2210                 if ($importer["page-flags"] == PAGE_NORMAL) {
2211
2212                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2213
2214                         $hash = random_string().(string)time();   // Generate a confirm_key
2215
2216                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2217                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2218                                 intval($importer["uid"]),
2219                                 intval($contact_record["id"]),
2220                                 0,
2221                                 0,
2222                                 dbesc(t("Sharing notification from Diaspora network")),
2223                                 dbesc($hash),
2224                                 dbesc(datetime_convert())
2225                         );
2226                 } else {
2227
2228                         // automatic friend approval
2229
2230                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2231
2232                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
2233
2234                         // technically they are sharing with us (CONTACT_IS_SHARING),
2235                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2236                         // we are going to change the relationship and make them a follower.
2237
2238                         if (($importer["page-flags"] == PAGE_FREELOVE) && $sharing && $following)
2239                                 $new_relation = CONTACT_IS_FRIEND;
2240                         elseif (($importer["page-flags"] == PAGE_FREELOVE) && $sharing)
2241                                 $new_relation = CONTACT_IS_SHARING;
2242                         else
2243                                 $new_relation = CONTACT_IS_FOLLOWER;
2244
2245                         $r = q("UPDATE `contact` SET `rel` = %d,
2246                                 `name-date` = '%s',
2247                                 `uri-date` = '%s',
2248                                 `blocked` = 0,
2249                                 `pending` = 0,
2250                                 `writable` = 1
2251                                 WHERE `id` = %d
2252                                 ",
2253                                 intval($new_relation),
2254                                 dbesc(datetime_convert()),
2255                                 dbesc(datetime_convert()),
2256                                 intval($contact_record["id"])
2257                         );
2258
2259                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2260                         if ($u) {
2261                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2262                                 $ret = self::send_share($u[0], $contact_record);
2263
2264                                 // Send the profile data, maybe it weren't transmitted before
2265                                 self::send_profile($importer["uid"], array($contact_record));
2266                         }
2267                 }
2268
2269                 return true;
2270         }
2271
2272         /**
2273          * @brief Fetches a message with a given guid
2274          *
2275          * @param string $guid message guid
2276          * @param string $orig_author handle of the original post
2277          * @param string $author handle of the sharer
2278          *
2279          * @return array The fetched item
2280          */
2281         private static function original_item($guid, $orig_author, $author) {
2282
2283                 // Do we already have this item?
2284                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2285                                 `author-name`, `author-link`, `author-avatar`
2286                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2287                         dbesc($guid));
2288
2289                 if (dbm::is_result($r)) {
2290                         logger("reshared message ".$guid." already exists on system.");
2291
2292                         // Maybe it is already a reshared item?
2293                         // Then refetch the content, if it is a reshare from a reshare.
2294                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2295                         if (self::is_reshare($r[0]["body"], true)) {
2296                                 $r = array();
2297                         } elseif (self::is_reshare($r[0]["body"], false)) {
2298                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2299
2300                                 $r[0]["body"] = self::replace_people_guid($r[0]["body"], $r[0]["author-link"]);
2301
2302                                 // Add OEmbed and other information to the body
2303                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
2304
2305                                 return $r[0];
2306                         } else {
2307                                 return $r[0];
2308                         }
2309                 }
2310
2311                 if (!dbm::is_result($r)) {
2312                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2313                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2314                         $item_id = self::store_by_guid($guid, $server);
2315
2316                         if (!$item_id) {
2317                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2318                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
2319                                 $item_id = self::store_by_guid($guid, $server);
2320                         }
2321
2322                         if ($item_id) {
2323                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2324                                                 `author-name`, `author-link`, `author-avatar`
2325                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2326                                         intval($item_id));
2327
2328                                 if (dbm::is_result($r)) {
2329                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2330                                         if (self::is_reshare($r[0]["body"], false)) {
2331                                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2332                                                 $r[0]["body"] = self::replace_people_guid($r[0]["body"], $r[0]["author-link"]);
2333                                         }
2334
2335                                         return $r[0];
2336                                 }
2337
2338                         }
2339                 }
2340                 return false;
2341         }
2342
2343         /**
2344          * @brief Processes a reshare message
2345          *
2346          * @param array $importer Array of the importer user
2347          * @param object $data The message object
2348          * @param string $xml The original XML of the message
2349          *
2350          * @return int the message id
2351          */
2352         private static function receive_reshare($importer, $data, $xml) {
2353                 $author = notags(unxmlify($data->author));
2354                 $guid = notags(unxmlify($data->guid));
2355                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2356                 $root_author = notags(unxmlify($data->root_author));
2357                 $root_guid = notags(unxmlify($data->root_guid));
2358                 /// @todo handle unprocessed property "provider_display_name"
2359                 $public = notags(unxmlify($data->public));
2360
2361                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2362                 if (!$contact) {
2363                         return false;
2364                 }
2365
2366                 $message_id = self::message_exists($importer["uid"], $guid);
2367                 if ($message_id) {
2368                         return true;
2369                 }
2370
2371                 $original_item = self::original_item($root_guid, $root_author, $author);
2372                 if (!$original_item) {
2373                         return false;
2374                 }
2375
2376                 $orig_url = App::get_baseurl()."/display/".$original_item["guid"];
2377
2378                 $datarray = array();
2379
2380                 $datarray["uid"] = $importer["uid"];
2381                 $datarray["contact-id"] = $contact["id"];
2382                 $datarray["network"]  = NETWORK_DIASPORA;
2383
2384                 $datarray["author-name"] = $contact["name"];
2385                 $datarray["author-link"] = $contact["url"];
2386                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2387
2388                 $datarray["owner-name"] = $datarray["author-name"];
2389                 $datarray["owner-link"] = $datarray["author-link"];
2390                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2391
2392                 $datarray["guid"] = $guid;
2393                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2394
2395                 $datarray["verb"] = ACTIVITY_POST;
2396                 $datarray["gravity"] = GRAVITY_PARENT;
2397
2398                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2399                 $datarray["source"] = $xml;
2400
2401                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
2402                                         $original_item["guid"], $original_item["created"], $orig_url);
2403                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2404
2405                 $datarray["tag"] = $original_item["tag"];
2406                 $datarray["app"]  = $original_item["app"];
2407
2408                 $datarray["plink"] = self::plink($author, $guid);
2409                 $datarray["private"] = (($public == "false") ? 1 : 0);
2410                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2411
2412                 $datarray["object-type"] = $original_item["object-type"];
2413
2414                 self::fetch_guid($datarray);
2415                 $message_id = item_store($datarray);
2416
2417                 if ($message_id) {
2418                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2419                         return true;
2420                 } else {
2421                         return false;
2422                 }
2423         }
2424
2425         /**
2426          * @brief Processes retractions
2427          *
2428          * @param array $importer Array of the importer user
2429          * @param array $contact The contact of the item owner
2430          * @param object $data The message object
2431          *
2432          * @return bool success
2433          */
2434         private static function item_retraction($importer, $contact, $data) {
2435                 $author = notags(unxmlify($data->author));
2436                 $target_guid = notags(unxmlify($data->target_guid));
2437                 $target_type = notags(unxmlify($data->target_type));
2438
2439                 $person = self::person_by_handle($author);
2440                 if (!is_array($person)) {
2441                         logger("unable to find author detail for ".$author);
2442                         return false;
2443                 }
2444
2445                 if (!isset($contact["url"])) {
2446                         $contact["url"] = $person["url"];
2447                 }
2448
2449                 $r = q("SELECT `id`, `parent`, `parent-uri`, `author-link` FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
2450                         dbesc($target_guid),
2451                         intval($importer["uid"])
2452                 );
2453                 if (!$r) {
2454                         logger("Target guid ".$target_guid." was not found for user ".$importer["uid"]);
2455                         return false;
2456                 }
2457
2458                 // Check if the sender is the thread owner
2459                 $p = q("SELECT `id`, `author-link`, `origin` FROM `item` WHERE `id` = %d",
2460                         intval($r[0]["parent"]));
2461
2462                 // Only delete it if the parent author really fits
2463                 if (!link_compare($p[0]["author-link"], $contact["url"]) && !link_compare($r[0]["author-link"], $contact["url"])) {
2464                         logger("Thread author ".$p[0]["author-link"]." and item author ".$r[0]["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2465                         return false;
2466                 }
2467
2468                 // 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
2469                 q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' WHERE `id` = %d",
2470                         dbesc(datetime_convert()),
2471                         dbesc(datetime_convert()),
2472                         intval($r[0]["id"])
2473                 );
2474                 delete_thread($r[0]["id"], $r[0]["parent-uri"]);
2475
2476                 logger("Deleted target ".$target_guid." (".$r[0]["id"].") from user ".$importer["uid"]." parent: ".$p[0]["id"], LOGGER_DEBUG);
2477
2478                 // Now check if the retraction needs to be relayed by us
2479                 if ($p[0]["origin"]) {
2480                         // notify others
2481                         proc_run(PRIORITY_HIGH, "include/notifier.php", "drop", $r[0]["id"]);
2482                 }
2483
2484                 return true;
2485         }
2486
2487         /**
2488          * @brief Receives retraction messages
2489          *
2490          * @param array $importer Array of the importer user
2491          * @param string $sender The sender of the message
2492          * @param object $data The message object
2493          *
2494          * @return bool Success
2495          */
2496         private static function receive_retraction($importer, $sender, $data) {
2497                 $target_type = notags(unxmlify($data->target_type));
2498
2499                 $contact = self::contact_by_handle($importer["uid"], $sender);
2500                 if (!$contact && (in_array($target_type, array("Contact", "Person")))) {
2501                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2502                         return false;
2503                 }
2504
2505                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2506
2507                 switch ($target_type) {
2508                         case "Comment":
2509                         case "Like":
2510                         case "Post":
2511                         case "Reshare":
2512                         case "StatusMessage":
2513                                 return self::item_retraction($importer, $contact, $data);
2514
2515                         case "Contact":
2516                         case "Person":
2517                                 /// @todo What should we do with an "unshare"?
2518                                 // Removing the contact isn't correct since we still can read the public items
2519                                 contact_remove($contact["id"]);
2520                                 return true;
2521
2522                         default:
2523                                 logger("Unknown target type ".$target_type);
2524                                 return false;
2525                 }
2526                 return true;
2527         }
2528
2529         /**
2530          * @brief Receives status messages
2531          *
2532          * @param array $importer Array of the importer user
2533          * @param object $data The message object
2534          * @param string $xml The original XML of the message
2535          *
2536          * @return int The message id of the newly created item
2537          */
2538         private static function receive_status_message($importer, $data, $xml) {
2539                 $author = notags(unxmlify($data->author));
2540                 $guid = notags(unxmlify($data->guid));
2541                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2542                 $public = notags(unxmlify($data->public));
2543                 $text = unxmlify($data->text);
2544                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2545
2546                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2547                 if (!$contact) {
2548                         return false;
2549                 }
2550
2551                 $message_id = self::message_exists($importer["uid"], $guid);
2552                 if ($message_id) {
2553                         return true;
2554                 }
2555
2556                 $address = array();
2557                 if ($data->location) {
2558                         foreach ($data->location->children() AS $fieldname => $data) {
2559                                 $address[$fieldname] = notags(unxmlify($data));
2560                         }
2561                 }
2562
2563                 $body = diaspora2bb($text);
2564
2565                 $datarray = array();
2566
2567                 // Attach embedded pictures to the body
2568                 if ($data->photo) {
2569                         foreach ($data->photo AS $photo) {
2570                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2571                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2572                         }
2573
2574                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2575                 } else {
2576                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2577
2578                         // Add OEmbed and other information to the body
2579                         if (!self::is_redmatrix($contact["url"])) {
2580                                 $body = add_page_info_to_body($body, false, true);
2581                         }
2582                 }
2583
2584                 /// @todo enable support for polls
2585                 //if ($data->poll) {
2586                 //      foreach ($data->poll AS $poll)
2587                 //              print_r($poll);
2588                 //      die("poll!\n");
2589                 //}
2590
2591                 /// @todo enable support for events
2592
2593                 $datarray["uid"] = $importer["uid"];
2594                 $datarray["contact-id"] = $contact["id"];
2595                 $datarray["network"] = NETWORK_DIASPORA;
2596
2597                 $datarray["author-name"] = $contact["name"];
2598                 $datarray["author-link"] = $contact["url"];
2599                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2600
2601                 $datarray["owner-name"] = $datarray["author-name"];
2602                 $datarray["owner-link"] = $datarray["author-link"];
2603                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2604
2605                 $datarray["guid"] = $guid;
2606                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2607
2608                 $datarray["verb"] = ACTIVITY_POST;
2609                 $datarray["gravity"] = GRAVITY_PARENT;
2610
2611                 $datarray["protocol"] = PROTOCOL_DIASPORA;
2612                 $datarray["source"] = $xml;
2613
2614                 $datarray["body"] = self::replace_people_guid($body, $contact["url"]);
2615
2616                 if ($provider_display_name != "") {
2617                         $datarray["app"] = $provider_display_name;
2618                 }
2619
2620                 $datarray["plink"] = self::plink($author, $guid);
2621                 $datarray["private"] = (($public == "false") ? 1 : 0);
2622                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2623
2624                 if (isset($address["address"])) {
2625                         $datarray["location"] = $address["address"];
2626                 }
2627
2628                 if (isset($address["lat"]) && isset($address["lng"])) {
2629                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2630                 }
2631
2632                 self::fetch_guid($datarray);
2633                 $message_id = item_store($datarray);
2634
2635                 if ($message_id) {
2636                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2637                         return true;
2638                 } else {
2639                         return false;
2640                 }
2641         }
2642
2643         /* ************************************************************************************** *
2644          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2645          * ************************************************************************************** */
2646
2647         /**
2648          * @brief returnes the handle of a contact
2649          *
2650          * @param array $me contact array
2651          *
2652          * @return string the handle in the format user@domain.tld
2653          */
2654         private static function my_handle($contact) {
2655                 if ($contact["addr"] != "") {
2656                         return $contact["addr"];
2657                 }
2658
2659                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2660                 // So - just in case - we build the the address here.
2661                 if ($contact["nickname"] != "") {
2662                         $nick = $contact["nickname"];
2663                 } else {
2664                         $nick = $contact["nick"];
2665                 }
2666
2667                 return $nick."@".substr(App::get_baseurl(), strpos(App::get_baseurl(),"://") + 3);
2668         }
2669
2670
2671         /**
2672          * @brief Creates the data for a private message in the new format
2673          *
2674          * @param string $msg The message that is to be transmitted
2675          * @param array $user The record of the sender
2676          * @param array $contact Target of the communication
2677          * @param string $prvkey The private key of the sender
2678          * @param string $pubkey The public key of the receiver
2679          *
2680          * @return string The encrypted data
2681          */
2682         public static function encode_private_data($msg, $user, $contact, $prvkey, $pubkey) {
2683
2684                 logger("Message: ".$msg, LOGGER_DATA);
2685
2686                 // without a public key nothing will work
2687                 if (!$pubkey) {
2688                         logger("pubkey missing: contact id: ".$contact["id"]);
2689                         return false;
2690                 }
2691
2692                 $aes_key = openssl_random_pseudo_bytes(32);
2693                 $b_aes_key = base64_encode($aes_key);
2694                 $iv = openssl_random_pseudo_bytes(16);
2695                 $b_iv = base64_encode($iv);
2696
2697                 $ciphertext = self::aes_encrypt($aes_key, $iv, $msg);
2698
2699                 $json = json_encode(array("iv" => $b_iv, "key" => $b_aes_key));
2700
2701                 $encrypted_key_bundle = "";
2702                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
2703
2704                 $json_object = json_encode(array("aes_key" => base64_encode($encrypted_key_bundle),
2705                                                 "encrypted_magic_envelope" => base64_encode($ciphertext)));
2706
2707                 return $json_object;
2708         }
2709
2710         /**
2711          * @brief Creates the envelope for the "fetch" endpoint and for the new format
2712          *
2713          * @param string $msg The message that is to be transmitted
2714          * @param array $user The record of the sender
2715          *
2716          * @return string The envelope
2717          */
2718         public static function build_magic_envelope($msg, $user) {
2719
2720                 $b64url_data = base64url_encode($msg);
2721                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2722
2723                 $key_id = base64url_encode(self::my_handle($user));
2724                 $type = "application/xml";
2725                 $encoding = "base64url";
2726                 $alg = "RSA-SHA256";
2727                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2728
2729                 // Fallback if the private key wasn't transmitted in the expected field
2730                 if ($user['uprvkey'] == "")
2731                         $user['uprvkey'] = $user['prvkey'];
2732
2733                 $signature = rsa_sign($signable_data, $user["uprvkey"]);
2734                 $sig = base64url_encode($signature);
2735
2736                 $xmldata = array("me:env" => array("me:data" => $data,
2737                                                         "@attributes" => array("type" => $type),
2738                                                         "me:encoding" => $encoding,
2739                                                         "me:alg" => $alg,
2740                                                         "me:sig" => $sig,
2741                                                         "@attributes2" => array("key_id" => $key_id)));
2742
2743                 $namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
2744
2745                 return xml::from_array($xmldata, $xml, false, $namespaces);
2746         }
2747
2748         /**
2749          * @brief Create the envelope for a message
2750          *
2751          * @param string $msg The message that is to be transmitted
2752          * @param array $user The record of the sender
2753          * @param array $contact Target of the communication
2754          * @param string $prvkey The private key of the sender
2755          * @param string $pubkey The public key of the receiver
2756          * @param bool $public Is the message public?
2757          *
2758          * @return string The message that will be transmitted to other servers
2759          */
2760         private static function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
2761
2762                 // The message is put into an envelope with the sender's signature
2763                 $envelope = self::build_magic_envelope($msg, $user);
2764
2765                 // Private messages are put into a second envelope, encrypted with the receivers public key
2766                 if (!$public) {
2767                         $envelope = self::encode_private_data($envelope, $user, $contact, $prvkey, $pubkey);
2768                 }
2769
2770                 return $envelope;
2771         }
2772
2773         /**
2774          * @brief Creates a signature for a message
2775          *
2776          * @param array $owner the array of the owner of the message
2777          * @param array $message The message that is to be signed
2778          *
2779          * @return string The signature
2780          */
2781         private static function signature($owner, $message) {
2782                 $sigmsg = $message;
2783                 unset($sigmsg["author_signature"]);
2784                 unset($sigmsg["parent_author_signature"]);
2785
2786                 $signed_text = implode(";", $sigmsg);
2787
2788                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2789         }
2790
2791         /**
2792          * @brief Transmit a message to a target server
2793          *
2794          * @param array $owner the array of the item owner
2795          * @param array $contact Target of the communication
2796          * @param string $envelope The message that is to be transmitted
2797          * @param bool $public_batch Is it a public post?
2798          * @param bool $queue_run Is the transmission called from the queue?
2799          * @param string $guid message guid
2800          *
2801          * @return int Result of the transmission
2802          */
2803         public static function transmit($owner, $contact, $envelope, $public_batch, $queue_run=false, $guid = "") {
2804
2805                 $a = get_app();
2806
2807                 $enabled = intval(get_config("system", "diaspora_enabled"));
2808                 if (!$enabled)
2809                         return 200;
2810
2811                 $logid = random_string(4);
2812                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2813                 if (!$dest_url) {
2814                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2815                         return 0;
2816                 }
2817
2818                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2819
2820                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2821                         $return_code = 0;
2822                 } else {
2823                         if (!intval(get_config("system", "diaspora_test"))) {
2824                                 $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
2825
2826                                 post_url($dest_url."/", $envelope, array("Content-Type: ".$content_type));
2827                                 $return_code = $a->get_curl_code();
2828                         } else {
2829                                 logger("test_mode");
2830                                 return 200;
2831                         }
2832                 }
2833
2834                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2835
2836                 if (!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2837                         logger("queue message");
2838
2839                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2840                                 intval($contact["id"]),
2841                                 dbesc(NETWORK_DIASPORA),
2842                                 dbesc($envelope),
2843                                 intval($public_batch)
2844                         );
2845                         if ($r) {
2846                                 logger("add_to_queue ignored - identical item already in queue");
2847                         } else {
2848                                 // queue message for redelivery
2849                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $envelope, $public_batch);
2850
2851                                 // The message could not be delivered. We mark the contact as "dead"
2852                                 mark_for_death($contact);
2853                         }
2854                 } elseif (($return_code >= 200) && ($return_code <= 299)) {
2855                         // We successfully delivered a message, the contact is alive
2856                         unmark_for_death($contact);
2857                 }
2858
2859                 return(($return_code) ? $return_code : (-1));
2860         }
2861
2862
2863         /**
2864          * @brief Build the post xml
2865          *
2866          * @param string $type The message type
2867          * @param array $message The message data
2868          *
2869          * @return string The post XML
2870          */
2871         public static function build_post_xml($type, $message) {
2872
2873                 $data = array($type => $message);
2874
2875                 return xml::from_array($data, $xml);
2876         }
2877
2878         /**
2879          * @brief Builds and transmit messages
2880          *
2881          * @param array $owner the array of the item owner
2882          * @param array $contact Target of the communication
2883          * @param string $type The message type
2884          * @param array $message The message data
2885          * @param bool $public_batch Is it a public post?
2886          * @param string $guid message guid
2887          * @param bool $spool Should the transmission be spooled or transmitted?
2888          *
2889          * @return int Result of the transmission
2890          */
2891         private static function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false) {
2892
2893                 $msg = self::build_post_xml($type, $message);
2894
2895                 logger('message: '.$msg, LOGGER_DATA);
2896                 logger('send guid '.$guid, LOGGER_DEBUG);
2897
2898                 // Fallback if the private key wasn't transmitted in the expected field
2899                 if ($owner['uprvkey'] == "")
2900                         $owner['uprvkey'] = $owner['prvkey'];
2901
2902                 $envelope = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
2903
2904                 if ($spool) {
2905                         add_to_queue($contact['id'], NETWORK_DIASPORA, $envelope, $public_batch);
2906                         return true;
2907                 } else
2908                         $return_code = self::transmit($owner, $contact, $envelope, $public_batch, false, $guid);
2909
2910                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
2911
2912                 return $return_code;
2913         }
2914
2915         /**
2916          * @brief Sends a "share" message
2917          *
2918          * @param array $owner the array of the item owner
2919          * @param array $contact Target of the communication
2920          *
2921          * @return int The result of the transmission
2922          */
2923         public static function send_share($owner, $contact) {
2924
2925                 /**
2926                  * @todo support the different possible combinations of "following" and "sharing"
2927                  * Currently, Diaspora only interprets the "sharing" field
2928                  *
2929                  * Before switching this code productive, we have to check all "send_share" calls if "rel" is set correctly
2930                  */
2931
2932                 /*
2933                 switch ($contact["rel"]) {
2934                         case CONTACT_IS_FRIEND:
2935                                 $following = true;
2936                                 $sharing = true;
2937                         case CONTACT_IS_SHARING:
2938                                 $following = false;
2939                                 $sharing = true;
2940                         case CONTACT_IS_FOLLOWER:
2941                                 $following = true;
2942                                 $sharing = false;
2943                 }
2944                 */
2945
2946                 $message = array("author" => self::my_handle($owner),
2947                                 "recipient" => $contact["addr"],
2948                                 "following" => "true",
2949                                 "sharing" => "true");
2950
2951                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
2952
2953                 return self::build_and_transmit($owner, $contact, "contact", $message);
2954         }
2955
2956         /**
2957          * @brief sends an "unshare"
2958          *
2959          * @param array $owner the array of the item owner
2960          * @param array $contact Target of the communication
2961          *
2962          * @return int The result of the transmission
2963          */
2964         public static function send_unshare($owner, $contact) {
2965
2966                 $message = array("author" => self::my_handle($owner),
2967                                 "recipient" => $contact["addr"],
2968                                 "following" => "false",
2969                                 "sharing" => "false");
2970
2971                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
2972
2973                 return self::build_and_transmit($owner, $contact, "contact", $message);
2974         }
2975
2976         /**
2977          * @brief Checks a message body if it is a reshare
2978          *
2979          * @param string $body The message body that is to be check
2980          * @param bool $complete Should it be a complete check or a simple check?
2981          *
2982          * @return array|bool Reshare details or "false" if no reshare
2983          */
2984         public static function is_reshare($body, $complete = true) {
2985                 $body = trim($body);
2986
2987                 // Skip if it isn't a pure repeated messages
2988                 // Does it start with a share?
2989                 if ((strpos($body, "[share") > 0) && $complete)
2990                         return(false);
2991
2992                 // Does it end with a share?
2993                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
2994                         return(false);
2995
2996                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
2997                 // Skip if there is no shared message in there
2998                 if ($body == $attributes)
2999                         return(false);
3000
3001                 // If we don't do the complete check we quit here
3002                 if (!$complete)
3003                         return true;
3004
3005                 $guid = "";
3006                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3007                 if ($matches[1] != "")
3008                         $guid = $matches[1];
3009
3010                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3011                 if ($matches[1] != "")
3012                         $guid = $matches[1];
3013
3014                 if ($guid != "") {
3015                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
3016                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
3017                         if ($r) {
3018                                 $ret= array();
3019                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
3020                                 $ret["root_guid"] = $guid;
3021                                 return($ret);
3022                         }
3023                 }
3024
3025                 $profile = "";
3026                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3027                 if ($matches[1] != "")
3028                         $profile = $matches[1];
3029
3030                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3031                 if ($matches[1] != "")
3032                         $profile = $matches[1];
3033
3034                 $ret= array();
3035
3036                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
3037                 if (($ret["root_handle"] == $profile) || ($ret["root_handle"] == ""))
3038                         return(false);
3039
3040                 $link = "";
3041                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
3042                 if ($matches[1] != "")
3043                         $link = $matches[1];
3044
3045                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
3046                 if ($matches[1] != "")
3047                         $link = $matches[1];
3048
3049                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
3050                 if (($ret["root_guid"] == $link) || (trim($ret["root_guid"]) == ""))
3051                         return(false);
3052
3053                 return($ret);
3054         }
3055
3056         /**
3057          * @brief Create an event array
3058          *
3059          * @param integer $event_id The id of the event
3060          *
3061          * @return array with event data
3062          */
3063         private static function build_event($event_id) {
3064
3065                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3066                 if (!dbm::is_result($r)) {
3067                         return array();
3068                 }
3069
3070                 $event = $r[0];
3071
3072                 $eventdata = array();
3073
3074                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3075                 if (!dbm::is_result($r)) {
3076                         return array();
3077                 }
3078
3079                 $user = $r[0];
3080
3081                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3082                 if (!dbm::is_result($r)) {
3083                         return array();
3084                 }
3085
3086                 $owner = $r[0];
3087
3088                 $eventdata['author'] = self::my_handle($owner);
3089
3090                 if ($event['guid']) {
3091                         $eventdata['guid'] = $event['guid'];
3092                 }
3093
3094                 $mask = 'Y-m-d\TH:i:s\Z';
3095
3096                 /// @todo - establish "all day" events in Friendica
3097                 $eventdata["all_day"] = "false";
3098
3099                 if (!$event['adjust']) {
3100                         $eventdata['timezone'] = $user['timezone'];
3101
3102                         if ($eventdata['timezone'] == "") {
3103                                 $eventdata['timezone'] = 'UTC';
3104                         }
3105                 }
3106
3107                 if ($event['start']) {
3108                         $eventdata['start'] = datetime_convert($eventdata['timezone'], "UTC", $event['start'], $mask);
3109                 }
3110                 if ($event['finish'] && !$event['nofinish']) {
3111                         $eventdata['end'] = datetime_convert($eventdata['timezone'], "UTC", $event['finish'], $mask);
3112                 }
3113                 if ($event['summary']) {
3114                         $eventdata['summary'] = html_entity_decode(bb2diaspora($event['summary']));
3115                 }
3116                 if ($event['desc']) {
3117                         $eventdata['description'] = html_entity_decode(bb2diaspora($event['desc']));
3118                 }
3119                 if ($event['location']) {
3120                         $location = array();
3121                         $location["address"] = html_entity_decode(bb2diaspora($event['location']));
3122                         $location["lat"] = 0;
3123                         $location["lng"] = 0;
3124                         $eventdata['location'] = $location;
3125                 }
3126
3127                 return $eventdata;
3128         }
3129
3130         /**
3131          * @brief Create a post (status message or reshare)
3132          *
3133          * @param array $item The item that will be exported
3134          * @param array $owner the array of the item owner
3135          *
3136          * @return array
3137          * 'type' -> Message type ("status_message" or "reshare")
3138          * 'message' -> Array of XML elements of the status
3139          */
3140         public static function build_status($item, $owner) {
3141
3142                 $cachekey = "diaspora:build_status:".$item['guid'];
3143
3144                 $result = Cache::get($cachekey);
3145                 if (!is_null($result)) {
3146                         return $result;
3147                 }
3148
3149                 $myaddr = self::my_handle($owner);
3150
3151                 $public = (($item["private"]) ? "false" : "true");
3152
3153                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3154
3155                 // Detect a share element and do a reshare
3156                 if (!$item['private'] && ($ret = self::is_reshare($item["body"]))) {
3157                         $message = array("author" => $myaddr,
3158                                         "guid" => $item["guid"],
3159                                         "created_at" => $created,
3160                                         "root_author" => $ret["root_handle"],
3161                                         "root_guid" => $ret["root_guid"],
3162                                         "provider_display_name" => $item["app"],
3163                                         "public" => $public);
3164
3165                         $type = "reshare";
3166                 } else {
3167                         $title = $item["title"];
3168                         $body = $item["body"];
3169
3170                         // convert to markdown
3171                         $body = html_entity_decode(bb2diaspora($body));
3172
3173                         // Adding the title
3174                         if (strlen($title))
3175                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3176
3177                         if ($item["attach"]) {
3178                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3179                                 if (cnt) {
3180                                         $body .= "\n".t("Attachments:")."\n";
3181                                         foreach ($matches as $mtch)
3182                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3183                                 }
3184                         }
3185
3186                         $location = array();
3187
3188                         if ($item["location"] != "")
3189                                 $location["address"] = $item["location"];
3190
3191                         if ($item["coord"] != "") {
3192                                 $coord = explode(" ", $item["coord"]);
3193                                 $location["lat"] = $coord[0];
3194                                 $location["lng"] = $coord[1];
3195                         }
3196
3197                         $message = array("author" => $myaddr,
3198                                         "guid" => $item["guid"],
3199                                         "created_at" => $created,
3200                                         "public" => $public,
3201                                         "text" => $body,
3202                                         "provider_display_name" => $item["app"],
3203                                         "location" => $location);
3204
3205                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3206                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3207                                 unset($message["location"]);
3208                         }
3209
3210                         if ($item['event-id'] > 0) {
3211                                 $event = self::build_event($item['event-id']);
3212                                 if (count($event)) {
3213                                         $message['event'] = $event;
3214
3215                                         /// @todo Once Diaspora supports it, we will remove the body
3216                                         // $message['text'] = '';
3217                                 }
3218                         }
3219
3220                         $type = "status_message";
3221                 }
3222
3223                 $msg = array("type" => $type, "message" => $message);
3224
3225                 Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
3226
3227                 return $msg;
3228         }
3229
3230         /**
3231          * @brief Sends a post
3232          *
3233          * @param array $item The item that will be exported
3234          * @param array $owner the array of the item owner
3235          * @param array $contact Target of the communication
3236          * @param bool $public_batch Is it a public post?
3237          *
3238          * @return int The result of the transmission
3239          */
3240         public static function send_status($item, $owner, $contact, $public_batch = false) {
3241
3242                 $status = self::build_status($item, $owner);
3243
3244                 return self::build_and_transmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3245         }
3246
3247         /**
3248          * @brief Creates a "like" object
3249          *
3250          * @param array $item The item that will be exported
3251          * @param array $owner the array of the item owner
3252          *
3253          * @return array The data for a "like"
3254          */
3255         private static function construct_like($item, $owner) {
3256
3257                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3258                         dbesc($item["thr-parent"]));
3259                 if (!dbm::is_result($p))
3260                         return false;
3261
3262                 $parent = $p[0];
3263
3264                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3265                 if ($item['verb'] === ACTIVITY_LIKE) {
3266                         $positive = "true";
3267                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3268                         $positive = "false";
3269                 }
3270
3271                 return(array("author" => self::my_handle($owner),
3272                                 "guid" => $item["guid"],
3273                                 "parent_guid" => $parent["guid"],
3274                                 "parent_type" => $target_type,
3275                                 "positive" => $positive,
3276                                 "author_signature" => ""));
3277         }
3278
3279         /**
3280          * @brief Creates an "EventParticipation" object
3281          *
3282          * @param array $item The item that will be exported
3283          * @param array $owner the array of the item owner
3284          *
3285          * @return array The data for an "EventParticipation"
3286          */
3287         private static function construct_attend($item, $owner) {
3288
3289                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
3290                         dbesc($item["thr-parent"]));
3291                 if (!dbm::is_result($p))
3292                         return false;
3293
3294                 $parent = $p[0];
3295
3296                 switch ($item['verb']) {
3297                         case ACTIVITY_ATTEND:
3298                                 $attend_answer = 'accepted';
3299                                 break;
3300                         case ACTIVITY_ATTENDNO:
3301                                 $attend_answer = 'declined';
3302                                 break;
3303                         case ACTIVITY_ATTENDMAYBE:
3304                                 $attend_answer = 'tentative';
3305                                 break;
3306                         default:
3307                                 logger('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3308                                 return false;
3309                 }
3310
3311                 return(array("author" => self::my_handle($owner),
3312                                 "guid" => $item["guid"],
3313                                 "parent_guid" => $parent["guid"],
3314                                 "status" => $attend_answer,
3315                                 "author_signature" => ""));
3316         }
3317
3318         /**
3319          * @brief Creates the object for a comment
3320          *
3321          * @param array $item The item that will be exported
3322          * @param array $owner the array of the item owner
3323          *
3324          * @return array The data for a comment
3325          */
3326         private static function construct_comment($item, $owner) {
3327
3328                 $cachekey = "diaspora:construct_comment:".$item['guid'];
3329
3330                 $result = Cache::get($cachekey);
3331                 if (!is_null($result)) {
3332                         return $result;
3333                 }
3334
3335                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3336                         intval($item["parent"]),
3337                         intval($item["parent"])
3338                 );
3339
3340                 if (!dbm::is_result($p))
3341                         return false;
3342
3343                 $parent = $p[0];
3344
3345                 $text = html_entity_decode(bb2diaspora($item["body"]));
3346                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3347
3348                 $comment = array("author" => self::my_handle($owner),
3349                                 "guid" => $item["guid"],
3350                                 "created_at" => $created,
3351                                 "parent_guid" => $parent["guid"],
3352                                 "text" => $text,
3353                                 "author_signature" => "");
3354
3355                 // Send the thread parent guid only if it is a threaded comment
3356                 if ($item['thr-parent'] != $item['parent-uri']) {
3357                         $comment['thread_parent_guid'] = self::get_guid_from_uri($item['thr-parent'], $item['uid']);
3358                 }
3359
3360                 Cache::set($cachekey, $comment, CACHE_QUARTER_HOUR);
3361
3362                 return($comment);
3363         }
3364
3365         /**
3366          * @brief Send a like or a comment
3367          *
3368          * @param array $item The item that will be exported
3369          * @param array $owner the array of the item owner
3370          * @param array $contact Target of the communication
3371          * @param bool $public_batch Is it a public post?
3372          *
3373          * @return int The result of the transmission
3374          */
3375         public static function send_followup($item,$owner,$contact,$public_batch = false) {
3376
3377                 if (in_array($item['verb'], array(ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE))) {
3378                         $message = self::construct_attend($item, $owner);
3379                         $type = "event_participation";
3380                 } elseif (in_array($item["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3381                         $message = self::construct_like($item, $owner);
3382                         $type = "like";
3383                 } else {
3384                         $message = self::construct_comment($item, $owner);
3385                         $type = "comment";
3386                 }
3387
3388                 if (!$message)
3389                         return false;
3390
3391                 $message["author_signature"] = self::signature($owner, $message);
3392
3393                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3394         }
3395
3396         /**
3397          * @brief Creates a message from a signature record entry
3398          *
3399          * @param array $item The item that will be exported
3400          * @param array $signature The entry of the "sign" record
3401          *
3402          * @return string The message
3403          */
3404         private static function message_from_signature($item, $signature) {
3405
3406                 // Split the signed text
3407                 $signed_parts = explode(";", $signature['signed_text']);
3408
3409                 if ($item["deleted"])
3410                         $message = array("author" => $signature['signer'],
3411                                         "target_guid" => $signed_parts[0],
3412                                         "target_type" => $signed_parts[1]);
3413                 elseif ($item['verb'] === ACTIVITY_LIKE)
3414                         $message = array("author" => $signed_parts[4],
3415                                         "guid" => $signed_parts[1],
3416                                         "parent_guid" => $signed_parts[3],
3417                                         "parent_type" => $signed_parts[2],
3418                                         "positive" => $signed_parts[0],
3419                                         "author_signature" => $signature['signature'],
3420                                         "parent_author_signature" => "");
3421                 else {
3422                         // Remove the comment guid
3423                         $guid = array_shift($signed_parts);
3424
3425                         // Remove the parent guid
3426                         $parent_guid = array_shift($signed_parts);
3427
3428                         // Remove the handle
3429                         $handle = array_pop($signed_parts);
3430
3431                         // Glue the parts together
3432                         $text = implode(";", $signed_parts);
3433
3434                         $message = array("author" => $handle,
3435                                         "guid" => $guid,
3436                                         "parent_guid" => $parent_guid,
3437                                         "text" => implode(";", $signed_parts),
3438                                         "author_signature" => $signature['signature'],
3439                                         "parent_author_signature" => "");
3440                 }
3441                 return $message;
3442         }
3443
3444         /**
3445          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3446          *
3447          * @param array $item The item that will be exported
3448          * @param array $owner the array of the item owner
3449          * @param array $contact Target of the communication
3450          * @param bool $public_batch Is it a public post?
3451          *
3452          * @return int The result of the transmission
3453          */
3454         public static function send_relay($item, $owner, $contact, $public_batch = false) {
3455
3456                 if ($item["deleted"])
3457                         return self::send_retraction($item, $owner, $contact, $public_batch, true);
3458                 elseif ($item['verb'] === ACTIVITY_LIKE)
3459                         $type = "like";
3460                 else
3461                         $type = "comment";
3462
3463                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3464
3465                 // fetch the original signature
3466
3467                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3468                         intval($item["id"]));
3469
3470                 if (!$r) {
3471                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3472                         return false;
3473                 }
3474
3475                 $signature = $r[0];
3476
3477                 // Old way - is used by the internal Friendica functions
3478                 /// @todo Change all signatur storing functions to the new format
3479                 if ($signature['signed_text'] && $signature['signature'] && $signature['signer'])
3480                         $message = self::message_from_signature($item, $signature);
3481                 else {// New way
3482                         $msg = json_decode($signature['signed_text'], true);
3483
3484                         $message = array();
3485                         if (is_array($msg)) {
3486                                 foreach ($msg AS $field => $data) {
3487                                         if (!$item["deleted"]) {
3488                                                 if ($field == "diaspora_handle") {
3489                                                         $field = "author";
3490                                                 }
3491                                                 if ($field == "target_type") {
3492                                                         $field = "parent_type";
3493                                                 }
3494                                         }
3495
3496                                         $message[$field] = $data;
3497                                 }
3498                         } else
3499                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3500                 }
3501
3502                 $message["parent_author_signature"] = self::signature($owner, $message);
3503
3504                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3505
3506                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3507         }
3508
3509         /**
3510          * @brief Sends a retraction (deletion) of a message, like or comment
3511          *
3512          * @param array $item The item that will be exported
3513          * @param array $owner the array of the item owner
3514          * @param array $contact Target of the communication
3515          * @param bool $public_batch Is it a public post?
3516          * @param bool $relay Is the retraction transmitted from a relay?
3517          *
3518          * @return int The result of the transmission
3519          */
3520         public static function send_retraction($item, $owner, $contact, $public_batch = false, $relay = false) {
3521
3522                 $itemaddr = self::handle_from_contact($item["contact-id"], $item["gcontact-id"]);
3523
3524                 $msg_type = "retraction";
3525                 $target_type = "Post";
3526
3527                 $message = array("author" => $itemaddr,
3528                                 "target_guid" => $item['guid'],
3529                                 "target_type" => $target_type);
3530
3531                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3532
3533                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3534         }
3535
3536         /**
3537          * @brief Sends a mail
3538          *
3539          * @param array $item The item that will be exported
3540          * @param array $owner The owner
3541          * @param array $contact Target of the communication
3542          *
3543          * @return int The result of the transmission
3544          */
3545         public static function send_mail($item, $owner, $contact) {
3546
3547                 $myaddr = self::my_handle($owner);
3548
3549                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3550                         intval($item["convid"]),
3551                         intval($item["uid"])
3552                 );
3553
3554                 if (!dbm::is_result($r)) {
3555                         logger("conversation not found.");
3556                         return;
3557                 }
3558                 $cnv = $r[0];
3559
3560                 $conv = array(
3561                         "author" => $cnv["creator"],
3562                         "guid" => $cnv["guid"],
3563                         "subject" => $cnv["subject"],
3564                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3565                         "participants" => $cnv["recips"]
3566                 );
3567
3568                 $body = bb2diaspora($item["body"]);
3569                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d\TH:i:s\Z');
3570
3571                 $msg = array(
3572                         "author" => $myaddr,
3573                         "guid" => $item["guid"],
3574                         "conversation_guid" => $cnv["guid"],
3575                         "text" => $body,
3576                         "created_at" => $created,
3577                 );
3578
3579                 if ($item["reply"]) {
3580                         $message = $msg;
3581                         $type = "message";
3582                 } else {
3583                         $message = array(
3584                                         "author" => $cnv["creator"],
3585                                         "guid" => $cnv["guid"],
3586                                         "subject" => $cnv["subject"],
3587                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d\TH:i:s\Z'),
3588                                         "participants" => $cnv["recips"],
3589                                         "message" => $msg);
3590
3591                         $type = "conversation";
3592                 }
3593
3594                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
3595         }
3596
3597         /**
3598          * @brief Sends profile data
3599          *
3600          * @param int $uid The user id
3601          */
3602         public static function send_profile($uid, $recips = false) {
3603
3604                 if (!$uid)
3605                         return;
3606
3607                 if (!$recips)
3608                         $recips = q("SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3609                                 AND `uid` = %d AND `rel` != %d",
3610                                 dbesc(NETWORK_DIASPORA),
3611                                 intval($uid),
3612                                 intval(CONTACT_IS_SHARING)
3613                         );
3614                 if (!$recips)
3615                         return;
3616
3617                 $r = q("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3618                         FROM `profile`
3619                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3620                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3621                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3622                         intval($uid)
3623                 );
3624
3625                 if (!$r)
3626                         return;
3627
3628                 $profile = $r[0];
3629
3630                 $handle = $profile["addr"];
3631                 $first = ((strpos($profile['name'],' ')
3632                         ? trim(substr($profile['name'],0,strpos($profile['name'],' '))) : $profile['name']));
3633                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3634                 $large = App::get_baseurl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3635                 $medium = App::get_baseurl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3636                 $small = App::get_baseurl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3637                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
3638
3639                 if ($searchable === 'true') {
3640                         $dob = '1000-00-00';
3641
3642                         if (($profile['dob']) && ($profile['dob'] > '0001-01-01'))
3643                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC','UTC',$profile['dob'],'m-d');
3644
3645                         $about = $profile['about'];
3646                         $about = strip_tags(bbcode($about));
3647
3648                         $location = formatted_location($profile);
3649                         $tags = '';
3650                         if ($profile['pub_keywords']) {
3651                                 $kw = str_replace(',',' ',$profile['pub_keywords']);
3652                                 $kw = str_replace('  ',' ',$kw);
3653                                 $arr = explode(' ',$profile['pub_keywords']);
3654                                 if (count($arr)) {
3655                                         for ($x = 0; $x < 5; $x ++) {
3656                                                 if (trim($arr[$x]))
3657                                                         $tags .= '#'. trim($arr[$x]) .' ';
3658                                         }
3659                                 }
3660                         }
3661                         $tags = trim($tags);
3662                 }
3663
3664                 $message = array("author" => $handle,
3665                                 "first_name" => $first,
3666                                 "last_name" => $last,
3667                                 "image_url" => $large,
3668                                 "image_url_medium" => $medium,
3669                                 "image_url_small" => $small,
3670                                 "birthday" => $dob,
3671                                 "gender" => $profile['gender'],
3672                                 "bio" => $about,
3673                                 "location" => $location,
3674                                 "searchable" => $searchable,
3675                                 "nsfw" => "false",
3676                                 "tag_string" => $tags);
3677
3678                 foreach ($recips as $recip) {
3679                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
3680                         self::build_and_transmit($profile, $recip, "profile", $message, false, "", true);
3681                 }
3682         }
3683
3684         /**
3685          * @brief Stores the signature for likes that are created on our system
3686          *
3687          * @param array $contact The contact array of the "like"
3688          * @param int $post_id The post id of the "like"
3689          *
3690          * @return bool Success
3691          */
3692         public static function store_like_signature($contact, $post_id) {
3693
3694                 // Is the contact the owner? Then fetch the private key
3695                 if (!$contact['self'] || ($contact['uid'] == 0)) {
3696                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
3697                         return false;
3698                 }
3699
3700                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
3701                 if (!dbm::is_result($r)) {
3702                         return false;
3703                 }
3704
3705                 $contact["uprvkey"] = $r[0]['prvkey'];
3706
3707                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
3708                 if (!dbm::is_result($r)) {
3709                         return false;
3710                 }
3711
3712                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE))) {
3713                         return false;
3714                 }
3715
3716                 $message = self::construct_like($r[0], $contact);
3717                 $message["author_signature"] = self::signature($contact, $message);
3718
3719                 /*
3720                  * Now store the signature more flexible to dynamically support new fields.
3721                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
3722                  */
3723                 q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3724                         intval($message_id),
3725                         dbesc(json_encode($message))
3726                 );
3727
3728                 logger('Stored diaspora like signature');
3729                 return true;
3730         }
3731
3732         /**
3733          * @brief Stores the signature for comments that are created on our system
3734          *
3735          * @param array $item The item array of the comment
3736          * @param array $contact The contact array of the item owner
3737          * @param string $uprvkey The private key of the sender
3738          * @param int $message_id The message id of the comment
3739          *
3740          * @return bool Success
3741          */
3742         public static function store_comment_signature($item, $contact, $uprvkey, $message_id) {
3743
3744                 if ($uprvkey == "") {
3745                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
3746                         return false;
3747                 }
3748
3749                 $contact["uprvkey"] = $uprvkey;
3750
3751                 $message = self::construct_comment($item, $contact);
3752                 $message["author_signature"] = self::signature($contact, $message);
3753
3754                 /*
3755                  * Now store the signature more flexible to dynamically support new fields.
3756                  * This will break Diaspora compatibility with Friendica versions prior to 3.5.
3757                  */
3758                 q("INSERT INTO `sign` (`iid`, `signed_text`) VALUES (%d, '%s')",
3759                         intval($message_id),
3760                         dbesc(json_encode($message))
3761                 );
3762
3763                 logger('Stored diaspora comment signature');
3764                 return true;
3765         }
3766 }