include/diaspora2.php

   1 <?php
   2 /**
   3  * @file include/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  */
   6
   7 require_once("include/items.php");
   8 require_once("include/bb2diaspora.php");
   9 require_once("include/Scrape.php");
  10 require_once("include/Contact.php");
  11 require_once("include/Photo.php");
  12 require_once("include/socgraph.php");
  13 require_once("include/group.php");
  14 require_once("include/xml.php");
  15 require_once("include/datetime.php");
  16
  17 /**
  18  * @brief This class contain functions to create and send Diaspora XML files
  19  *
  20  */
  21 class diaspora {
  22
  23         public static function relay_list() {
  24
  25                 $serverdata = get_config("system", "relay_server");
  26                 if ($serverdata == "")
  27                         return array();
  28
  29                 $relay = array();
  30
  31                 $servers = explode(",", $serverdata);
  32
  33                 foreach($servers AS $server) {
  34                         $server = trim($server);
  35                         $batch = $server."/receive/public";
  36
  37                         $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  38
  39                         if (!$relais) {
  40                                 $addr = "relay@".str_replace("http://", "", normalise_link($server));
  41
  42                                 $r = q("INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
  43                                         VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
  44                                         datetime_convert(),
  45                                         dbesc($addr),
  46                                         dbesc($addr),
  47                                         dbesc($server),
  48                                         dbesc(normalise_link($server)),
  49                                         dbesc($batch),
  50                                         dbesc(NETWORK_DIASPORA),
  51                                         intval(CONTACT_IS_FOLLOWER),
  52                                         dbesc(datetime_convert()),
  53                                         dbesc(datetime_convert()),
  54                                         dbesc(datetime_convert())
  55                                 );
  56
  57                                 $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  58                                 if ($relais)
  59                                         $relay[] = $relais[0];
  60                         } else
  61                                 $relay[] = $relais[0];
  62                 }
  63
  64                 return $relay;
  65         }
  66
  67         function repair_signature($signature, $handle = "", $level = 1) {
  68
  69                 if ($signature == "")
  70                         return ($signature);
  71
  72                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
  73                         $signature = base64_decode($signature);
  74                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
  75
  76                         // Do a recursive call to be able to fix even multiple levels
  77                         if ($level < 10)
  78                                 $signature = self::repair_signature($signature, $handle, ++$level);
  79                 }
  80
  81                 return($signature);
  82         }
  83
  84         /**
  85          * @brief: Decodes incoming Diaspora message
  86          *
  87          * @param array $importer from user table
  88          * @param string $xml urldecoded Diaspora salmon
  89          *
  90          * @return array
  91          * 'message' -> decoded Diaspora XML message
  92          * 'author' -> author diaspora handle
  93          * 'key' -> author public key (converted to pkcs#8)
  94          */
  95         function decode($importer, $xml) {
  96
  97                 $public = false;
  98                 $basedom = parse_xml_string($xml);
  99
 100                 if (!is_object($basedom))
 101                         return false;
 102
 103                 $children = $basedom->children('https://joindiaspora.com/protocol');
 104
 105                 if($children->header) {
 106                         $public = true;
 107                         $author_link = str_replace('acct:','',$children->header->author_id);
 108                 } else {
 109
 110                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 111
 112                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 113                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 114
 115                         $outer_key_bundle = '';
 116                         openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
 117
 118                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 119
 120                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 121                         $outer_key = base64_decode($j_outer_key_bundle->key);
 122
 123                         $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);
 124
 125
 126                         $decrypted = pkcs5_unpad($decrypted);
 127
 128                         /**
 129                          * $decrypted now contains something like
 130                          *
 131                          *  <decrypted_header>
 132                          *     <iv>8e+G2+ET8l5BPuW0sVTnQw==</iv>
 133                          *     <aes_key>UvSMb4puPeB14STkcDWq+4QE302Edu15oaprAQSkLKU=</aes_key>
 134                          *     <author_id>galaxor@diaspora.priateship.org</author_id>
 135                          *  </decrypted_header>
 136                          */
 137
 138                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 139                         $idom = parse_xml_string($decrypted,false);
 140
 141                         $inner_iv = base64_decode($idom->iv);
 142                         $inner_aes_key = base64_decode($idom->aes_key);
 143
 144                         $author_link = str_replace('acct:','',$idom->author_id);
 145                 }
 146
 147                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 148
 149                 // figure out where in the DOM tree our data is hiding
 150
 151                 if($dom->provenance->data)
 152                         $base = $dom->provenance;
 153                 elseif($dom->env->data)
 154                         $base = $dom->env;
 155                 elseif($dom->data)
 156                         $base = $dom;
 157
 158                 if (!$base) {
 159                         logger('unable to locate salmon data in xml');
 160                         http_status_exit(400);
 161                 }
 162
 163
 164                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 165                 $signature = base64url_decode($base->sig);
 166
 167                 // unpack the  data
 168
 169                 // strip whitespace so our data element will return to one big base64 blob
 170                 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
 171
 172
 173                 // stash away some other stuff for later
 174
 175                 $type = $base->data[0]->attributes()->type[0];
 176                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 177                 $encoding = $base->encoding;
 178                 $alg = $base->alg;
 179
 180
 181                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 182
 183
 184                 // decode the data
 185                 $data = base64url_decode($data);
 186
 187
 188                 if($public)
 189                         $inner_decrypted = $data;
 190                 else {
 191
 192                         // Decode the encrypted blob
 193
 194                         $inner_encrypted = base64_decode($data);
 195                         $inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
 196                         $inner_decrypted = pkcs5_unpad($inner_decrypted);
 197                 }
 198
 199                 if (!$author_link) {
 200                         logger('Could not retrieve author URI.');
 201                         http_status_exit(400);
 202                 }
 203                 // Once we have the author URI, go to the web and try to find their public key
 204                 // (first this will look it up locally if it is in the fcontact cache)
 205                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 206
 207                 logger('Fetching key for '.$author_link);
 208                 $key = self::key($author_link);
 209
 210                 if (!$key) {
 211                         logger('Could not retrieve author key.');
 212                         http_status_exit(400);
 213                 }
 214
 215                 $verify = rsa_verify($signed_data,$signature,$key);
 216
 217                 if (!$verify) {
 218                         logger('Message did not verify. Discarding.');
 219                         http_status_exit(400);
 220                 }
 221
 222                 logger('Message verified.');
 223
 224                 return array('message' => $inner_decrypted, 'author' => $author_link, 'key' => $key);
 225
 226         }
 227
 228
 229         /**
 230          * @brief Dispatches public messages and find the fitting receivers
 231          *
 232          * @param array $msg The post that will be dispatched
 233          *
 234          * @return bool Was the message accepted?
 235          */
 236         public static function dispatch_public($msg) {
 237
 238                 $enabled = intval(get_config("system", "diaspora_enabled"));
 239                 if (!$enabled) {
 240                         logger("diaspora is disabled");
 241                         return false;
 242                 }
 243
 244                 // Use a dummy importer to import the data for the public copy
 245                 $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 246                 $item_id = self::dispatch($importer,$msg);
 247
 248                 // Now distribute it to the followers
 249                 $r = q("SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 250                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 251                         AND NOT `account_expired` AND NOT `account_removed`",
 252                         dbesc(NETWORK_DIASPORA),
 253                         dbesc($msg["author"])
 254                 );
 255                 if($r) {
 256                         foreach($r as $rr) {
 257                                 logger("delivering to: ".$rr["username"]);
 258                                 self::dispatch($rr,$msg);
 259                         }
 260                 } else
 261                         logger("No subscribers for ".$msg["author"]." ".print_r($msg, true));
 262
 263                 return $item_id;
 264         }
 265
 266         /**
 267          * @brief Dispatches the different message types to the different functions
 268          *
 269          * @param array $importer Array of the importer user
 270          * @param array $msg The post that will be dispatched
 271          *
 272          * @return bool Was the message accepted?
 273          */
 274         public static function dispatch($importer, $msg) {
 275
 276                 // The sender is the handle of the contact that sent the message.
 277                 // This will often be different with relayed messages (for example "like" and "comment")
 278                 $sender = $msg["author"];
 279
 280                 if (!diaspora::valid_posting($msg, $fields)) {
 281                         logger("Invalid posting");
 282                         return false;
 283                 }
 284
 285                 $type = $fields->getName();
 286
 287                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 288
 289                 switch ($type) {
 290                         case "account_deletion":
 291                                 return self::receive_account_deletion($importer, $fields);
 292
 293                         case "comment":
 294                                 return self::receive_comment($importer, $sender, $fields);
 295
 296                         case "conversation":
 297                                 return self::receive_conversation($importer, $msg, $fields);
 298
 299                         case "like":
 300                                 return self::receive_like($importer, $sender, $fields);
 301
 302                         case "message":
 303                                 return self::receive_message($importer, $fields);
 304
 305                         case "participation": // Not implemented
 306                                 return self::receive_participation($importer, $fields);
 307
 308                         case "photo": // Not implemented
 309                                 return self::receive_photo($importer, $fields);
 310
 311                         case "poll_participation": // Not implemented
 312                                 return self::receive_poll_participation($importer, $fields);
 313
 314                         case "profile":
 315                                 return self::receive_profile($importer, $fields);
 316
 317                         case "request":
 318                                 return self::receive_request($importer, $fields);
 319
 320                         case "reshare":
 321                                 return self::receive_reshare($importer, $fields);
 322
 323                         case "retraction":
 324                                 return self::receive_retraction($importer, $sender, $fields);
 325
 326                         case "status_message":
 327                                 return self::receive_status_message($importer, $fields);
 328
 329                         default:
 330                                 logger("Unknown message type ".$type);
 331                                 return false;
 332                 }
 333
 334                 return true;
 335         }
 336
 337         /**
 338          * @brief Checks if a posting is valid and fetches the data fields.
 339          *
 340          * This function does not only check the signature.
 341          * It also does the conversion between the old and the new diaspora format.
 342          *
 343          * @param array $msg Array with the XML, the sender handle and the sender signature
 344          * @param object $fields SimpleXML object that contains the posting when it is valid
 345          *
 346          * @return bool Is the posting valid?
 347          */
 348         private function valid_posting($msg, &$fields) {
 349
 350                 $data = parse_xml_string($msg["message"], false);
 351
 352                 if (!is_object($data))
 353                         return false;
 354
 355                 $first_child = $data->getName();
 356
 357                 // Is this the new or the old version?
 358                 if ($data->getName() == "XML") {
 359                         $oldXML = true;
 360                         foreach ($data->post->children() as $child)
 361                                 $element = $child;
 362                 } else {
 363                         $oldXML = false;
 364                         $element = $data;
 365                 }
 366
 367                 $type = $element->getName();
 368                 $orig_type = $type;
 369
 370                 // All retractions are handled identically from now on.
 371                 // In the new version there will only be "retraction".
 372                 if (in_array($type, array("signed_retraction", "relayable_retraction")))
 373                         $type = "retraction";
 374
 375                 $fields = new SimpleXMLElement("<".$type."/>");
 376
 377                 $signed_data = "";
 378
 379                 foreach ($element->children() AS $fieldname => $entry) {
 380                         if ($oldXML) {
 381                                 // Translation for the old XML structure
 382                                 if ($fieldname == "diaspora_handle")
 383                                         $fieldname = "author";
 384
 385                                 if ($fieldname == "participant_handles")
 386                                         $fieldname = "participants";
 387
 388                                 if (in_array($type, array("like", "participation"))) {
 389                                         if ($fieldname == "target_type")
 390                                                 $fieldname = "parent_type";
 391                                 }
 392
 393                                 if ($fieldname == "sender_handle")
 394                                         $fieldname = "author";
 395
 396                                 if ($fieldname == "recipient_handle")
 397                                         $fieldname = "recipient";
 398
 399                                 if ($fieldname == "root_diaspora_id")
 400                                         $fieldname = "root_author";
 401
 402                                 if ($type == "retraction") {
 403                                         if ($fieldname == "post_guid")
 404                                                 $fieldname = "target_guid";
 405
 406                                         if ($fieldname == "type")
 407                                                 $fieldname = "target_type";
 408                                 }
 409                         }
 410
 411                         if ($fieldname == "author_signature")
 412                                 $author_signature = base64_decode($entry);
 413                         elseif ($fieldname == "parent_author_signature")
 414                                 $parent_author_signature = base64_decode($entry);
 415                         elseif ($fieldname != "target_author_signature") {
 416                                 if ($signed_data != "") {
 417                                         $signed_data .= ";";
 418                                         $signed_data_parent .= ";";
 419                                 }
 420
 421                                 $signed_data .= $entry;
 422                         }
 423                         if (!in_array($fieldname, array("parent_author_signature", "target_author_signature")) OR
 424                                 ($orig_type == "relayable_retraction"))
 425                                 xml::copy($entry, $fields, $fieldname);
 426                 }
 427
 428                 // This is something that shouldn't happen at all.
 429                 if (in_array($type, array("status_message", "reshare", "profile")))
 430                         if ($msg["author"] != $fields->author) {
 431                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 432                                 return false;
 433                         }
 434
 435                 // Only some message types have signatures. So we quit here for the other types.
 436                 if (!in_array($type, array("comment", "message", "like")))
 437                         return true;
 438
 439                 // No author_signature? This is a must, so we quit.
 440                 if (!isset($author_signature))
 441                         return false;
 442
 443                 if (isset($parent_author_signature)) {
 444                         $key = self::key($msg["author"]);
 445
 446                         if (!rsa_verify($signed_data, $parent_author_signature, $key, "sha256"))
 447                                 return false;
 448                 }
 449
 450                 $key = self::key($fields->author);
 451
 452                 return rsa_verify($signed_data, $author_signature, $key, "sha256");
 453         }
 454
 455         /**
 456          * @brief Fetches the public key for a given handle
 457          *
 458          * @param string $handle The handle
 459          *
 460          * @return string The public key
 461          */
 462         private function key($handle) {
 463                 $handle = strval($handle);
 464
 465                 logger("Fetching diaspora key for: ".$handle);
 466
 467                 $r = self::person_by_handle($handle);
 468                 if($r)
 469                         return $r["pubkey"];
 470
 471                 return "";
 472         }
 473
 474         /**
 475          * @brief Fetches data for a given handle
 476          *
 477          * @param string $handle The handle
 478          *
 479          * @return array the queried data
 480          */
 481         private function person_by_handle($handle) {
 482
 483                 $r = q("SELECT * FROM `fcontact` WHERE `network` = '%s' AND `addr` = '%s' LIMIT 1",
 484                         dbesc(NETWORK_DIASPORA),
 485                         dbesc($handle)
 486                 );
 487                 if ($r) {
 488                         $person = $r[0];
 489                         logger("In cache ".print_r($r,true), LOGGER_DEBUG);
 490
 491                         // update record occasionally so it doesn't get stale
 492                         $d = strtotime($person["updated"]." +00:00");
 493                         if ($d < strtotime("now - 14 days"))
 494                                 $update = true;
 495                 }
 496
 497                 if (!$person OR $update) {
 498                         logger("create or refresh", LOGGER_DEBUG);
 499                         $r = probe_url($handle, PROBE_DIASPORA);
 500
 501                         // Note that Friendica contacts will return a "Diaspora person"
 502                         // if Diaspora connectivity is enabled on their server
 503                         if ($r AND ($r["network"] === NETWORK_DIASPORA)) {
 504                                 self::add_fcontact($r, $update);
 505                                 $person = $r;
 506                         }
 507                 }
 508                 return $person;
 509         }
 510
 511         /**
 512          * @brief Updates the fcontact table
 513          *
 514          * @param array $arr The fcontact data
 515          * @param bool $update Update or insert?
 516          *
 517          * @return string The id of the fcontact entry
 518          */
 519         private function add_fcontact($arr, $update = false) {
 520                 /// @todo Remove this function from include/network.php
 521
 522                 if($update) {
 523                         $r = q("UPDATE `fcontact` SET
 524                                         `name` = '%s',
 525                                         `photo` = '%s',
 526                                         `request` = '%s',
 527                                         `nick` = '%s',
 528                                         `addr` = '%s',
 529                                         `batch` = '%s',
 530                                         `notify` = '%s',
 531                                         `poll` = '%s',
 532                                         `confirm` = '%s',
 533                                         `alias` = '%s',
 534                                         `pubkey` = '%s',
 535                                         `updated` = '%s'
 536                                 WHERE `url` = '%s' AND `network` = '%s'",
 537                                         dbesc($arr["name"]),
 538                                         dbesc($arr["photo"]),
 539                                         dbesc($arr["request"]),
 540                                         dbesc($arr["nick"]),
 541                                         dbesc($arr["addr"]),
 542                                         dbesc($arr["batch"]),
 543                                         dbesc($arr["notify"]),
 544                                         dbesc($arr["poll"]),
 545                                         dbesc($arr["confirm"]),
 546                                         dbesc($arr["alias"]),
 547                                         dbesc($arr["pubkey"]),
 548                                         dbesc(datetime_convert()),
 549                                         dbesc($arr["url"]),
 550                                         dbesc($arr["network"])
 551                                 );
 552                 } else {
 553                         $r = q("INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`,
 554                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 555                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 556                                         dbesc($arr["url"]),
 557                                         dbesc($arr["name"]),
 558                                         dbesc($arr["photo"]),
 559                                         dbesc($arr["request"]),
 560                                         dbesc($arr["nick"]),
 561                                         dbesc($arr["addr"]),
 562                                         dbesc($arr["batch"]),
 563                                         dbesc($arr["notify"]),
 564                                         dbesc($arr["poll"]),
 565                                         dbesc($arr["confirm"]),
 566                                         dbesc($arr["network"]),
 567                                         dbesc($arr["alias"]),
 568                                         dbesc($arr["pubkey"]),
 569                                         dbesc(datetime_convert())
 570                                 );
 571                 }
 572
 573                 return $r;
 574         }
 575
 576         public static function handle_from_contact($contact_id) {
 577                 $handle = False;
 578
 579                 logger("contact id is ".$contact_id, LOGGER_DEBUG);
 580
 581                 $r = q("SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 582                        intval($contact_id)
 583                 );
 584                 if($r) {
 585                         $contact = $r[0];
 586
 587                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 588
 589                         if($contact['addr'] != "")
 590                                 $handle = $contact['addr'];
 591                         elseif(($contact['network'] === NETWORK_DFRN) || ($contact['self'] == 1)) {
 592                                 $baseurl_start = strpos($contact['url'],'://') + 3;
 593                                 $baseurl_length = strpos($contact['url'],'/profile') - $baseurl_start; // allows installations in a subdirectory--not sure how Diaspora will handle
 594                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 595                                 $handle = $contact['nick'].'@'.$baseurl;
 596                         }
 597                 }
 598
 599                 return $handle;
 600         }
 601
 602         private function contact_by_handle($uid, $handle) {
 603                 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
 604                         intval($uid),
 605                         dbesc($handle)
 606                 );
 607
 608                 if ($r)
 609                         return $r[0];
 610
 611                 $handle_parts = explode("@", $handle);
 612                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
 613                 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
 614                         dbesc(NETWORK_DFRN),
 615                         intval($uid),
 616                         dbesc($nurl_sql)
 617                 );
 618                 if($r)
 619                         return $r[0];
 620
 621                 return false;
 622         }
 623
 624         private function post_allow($importer, $contact, $is_comment = false) {
 625
 626                 // perhaps we were already sharing with this person. Now they're sharing with us.
 627                 // That makes us friends.
 628                 // Normally this should have handled by getting a request - but this could get lost
 629                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
 630                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
 631                                 intval(CONTACT_IS_FRIEND),
 632                                 intval($contact["id"]),
 633                                 intval($importer["uid"])
 634                         );
 635                         $contact["rel"] = CONTACT_IS_FRIEND;
 636                         logger("defining user ".$contact["nick"]." as friend");
 637                 }
 638
 639                 if(($contact["blocked"]) || ($contact["readonly"]) || ($contact["archive"]))
 640                         return false;
 641                 if($contact["rel"] == CONTACT_IS_SHARING || $contact["rel"] == CONTACT_IS_FRIEND)
 642                         return true;
 643                 if($contact["rel"] == CONTACT_IS_FOLLOWER)
 644                         if(($importer["page-flags"] == PAGE_COMMUNITY) OR $is_comment)
 645                                 return true;
 646
 647                 // Messages for the global users are always accepted
 648                 if ($importer["uid"] == 0)
 649                         return true;
 650
 651                 return false;
 652         }
 653
 654         private function allowed_contact_by_handle($importer, $handle, $is_comment = false) {
 655                 $contact = self::contact_by_handle($importer["uid"], $handle);
 656                 if (!$contact) {
 657                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
 658                         return false;
 659                 }
 660
 661                 if (!self::post_allow($importer, $contact, $is_comment)) {
 662                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
 663                         return false;
 664                 }
 665                 return $contact;
 666         }
 667
 668         private function message_exists($uid, $guid) {
 669                 $r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 670                         intval($uid),
 671                         dbesc($guid)
 672                 );
 673
 674                 if($r) {
 675                         logger("message ".$guid." already exists for user ".$uid);
 676                         return true;
 677                 }
 678
 679                 return false;
 680         }
 681
 682         private function fetch_guid($item) {
 683                 preg_replace_callback("&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
 684                         function ($match) use ($item){
 685                                 return(self::fetch_guid_sub($match, $item));
 686                         },$item["body"]);
 687         }
 688
 689         private function fetch_guid_sub($match, $item) {
 690                 if (!self::store_by_guid($match[1], $item["author-link"]))
 691                         self::store_by_guid($match[1], $item["owner-link"]);
 692         }
 693
 694         private function store_by_guid($guid, $server, $uid = 0) {
 695                 $serverparts = parse_url($server);
 696                 $server = $serverparts["scheme"]."://".$serverparts["host"];
 697
 698                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
 699
 700                 $msg = self::message($guid, $server);
 701
 702                 if (!$msg)
 703                         return false;
 704
 705                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
 706
 707                 // Now call the dispatcher
 708                 return self::dispatch_public($msg);
 709         }
 710
 711         private function message($guid, $server, $level = 0) {
 712
 713                 if ($level > 5)
 714                         return false;
 715
 716                 // This will work for Diaspora and newer Friendica servers
 717                 $source_url = $server."/p/".$guid.".xml";
 718                 $x = fetch_url($source_url);
 719                 if(!$x)
 720                         return false;
 721
 722                 $source_xml = parse_xml_string($x, false);
 723
 724                 if (!is_object($source_xml))
 725                         return false;
 726
 727                 if ($source_xml->post->reshare) {
 728                         // Reshare of a reshare - old Diaspora version
 729                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
 730                 } elseif ($source_xml->getName() == "reshare") {
 731                         // Reshare of a reshare - new Diaspora version
 732                         return self::message($source_xml->root_guid, $server, ++$level);
 733                 }
 734
 735                 $author = "";
 736
 737                 // Fetch the author - for the old and the new Diaspora version
 738                 if ($source_xml->post->status_message->diaspora_handle)
 739                         $author = (string)$source_xml->post->status_message->diaspora_handle;
 740                 elseif ($source_xml->author AND ($source_xml->getName() == "status_message"))
 741                         $author = (string)$source_xml->author;
 742
 743                 // If this isn't a "status_message" then quit
 744                 if (!$author)
 745                         return false;
 746
 747                 $msg = array("message" => $x, "author" => $author);
 748
 749                 $msg["key"] = self::key($msg["author"]);
 750
 751                 return $msg;
 752         }
 753
 754         private function parent_item($uid, $guid, $author, $contact) {
 755                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 756                                 `author-name`, `author-link`, `author-avatar`,
 757                                 `owner-name`, `owner-link`, `owner-avatar`
 758                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 759                         intval($uid), dbesc($guid));
 760
 761                 if(!$r) {
 762                         $result = self::store_by_guid($guid, $contact["url"], $uid);
 763
 764                         if (!$result) {
 765                                 $person = self::person_by_handle($author);
 766                                 $result = self::store_by_guid($guid, $person["url"], $uid);
 767                         }
 768
 769                         if ($result) {
 770                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
 771
 772                                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 773                                                 `author-name`, `author-link`, `author-avatar`,
 774                                                 `owner-name`, `owner-link`, `owner-avatar`
 775                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 776                                         intval($uid), dbesc($guid));
 777                         }
 778                 }
 779
 780                 if (!$r) {
 781                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
 782                         return false;
 783                 } else {
 784                         logger("parent item found: parent: ".$guid." - user: ".$uid);
 785                         return $r[0];
 786                 }
 787         }
 788
 789         private function author_contact_by_url($contact, $person, $uid) {
 790
 791                 $r = q("SELECT `id`, `network` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
 792                         dbesc(normalise_link($person["url"])), intval($uid));
 793                 if ($r) {
 794                         $cid = $r[0]["id"];
 795                         $network = $r[0]["network"];
 796                 } else {
 797                         $cid = $contact["id"];
 798                         $network = NETWORK_DIASPORA;
 799                 }
 800
 801                 return (array("cid" => $cid, "network" => $network));
 802         }
 803
 804         public static function is_redmatrix($url) {
 805                 return(strstr($url, "/channel/"));
 806         }
 807
 808         private function plink($addr, $guid) {
 809                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
 810
 811                 // Fallback
 812                 if (!$r)
 813                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
 814
 815                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
 816                 // So we try another way as well.
 817                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
 818                 if ($s)
 819                         $r[0]["network"] = $s[0]["network"];
 820
 821                 if ($r[0]["network"] == NETWORK_DFRN)
 822                         return(str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/"));
 823
 824                 if (self::is_redmatrix($r[0]["url"]))
 825                         return $r[0]["url"]."/?f=&mid=".$guid;
 826
 827                 return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
 828         }
 829
 830         private function receive_account_deletion($importer, $data) {
 831                 $author = notags(unxmlify($data->author));
 832
 833                 $contact = self::contact_by_handle($importer["uid"], $author);
 834                 if (!$contact) {
 835                         logger("cannot find contact for author: ".$author);
 836                         return false;
 837                 }
 838
 839                 // We now remove the contact
 840                 contact_remove($contact["id"]);
 841                 return true;
 842         }
 843
 844         private function receive_comment($importer, $sender, $data) {
 845                 $guid = notags(unxmlify($data->guid));
 846                 $parent_guid = notags(unxmlify($data->parent_guid));
 847                 $text = unxmlify($data->text);
 848                 $author = notags(unxmlify($data->author));
 849
 850                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
 851                 if (!$contact)
 852                         return false;
 853
 854                 if (self::message_exists($importer["uid"], $guid))
 855                         return false;
 856
 857                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
 858                 if (!$parent_item)
 859                         return false;
 860
 861                 $person = self::person_by_handle($author);
 862                 if (!is_array($person)) {
 863                         logger("unable to find author details");
 864                         return false;
 865                 }
 866
 867                 // Fetch the contact id - if we know this contact
 868                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
 869
 870                 $datarray = array();
 871
 872                 $datarray["uid"] = $importer["uid"];
 873                 $datarray["contact-id"] = $author_contact["cid"];
 874                 $datarray["network"]  = $author_contact["network"];
 875
 876                 $datarray["author-name"] = $person["name"];
 877                 $datarray["author-link"] = $person["url"];
 878                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
 879
 880                 $datarray["owner-name"] = $contact["name"];
 881                 $datarray["owner-link"] = $contact["url"];
 882                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
 883
 884                 $datarray["guid"] = $guid;
 885                 $datarray["uri"] = $author.":".$guid;
 886
 887                 $datarray["type"] = "remote-comment";
 888                 $datarray["verb"] = ACTIVITY_POST;
 889                 $datarray["gravity"] = GRAVITY_COMMENT;
 890                 $datarray["parent-uri"] = $parent_item["uri"];
 891
 892                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
 893                 $datarray["object"] = json_encode($data);
 894
 895                 $datarray["body"] = diaspora2bb($text);
 896
 897                 self::fetch_guid($datarray);
 898
 899                 $message_id = item_store($datarray);
 900
 901                 if ($message_id)
 902                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
 903
 904                 // If we are the origin of the parent we store the original data and notify our followers
 905                 if($message_id AND $parent_item["origin"]) {
 906
 907                         // Formerly we stored the signed text, the signature and the author in different fields.
 908                         // We now store the raw data so that we are more flexible.
 909                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
 910                                 intval($message_id),
 911                                 dbesc(json_encode($data))
 912                         );
 913
 914                         // notify others
 915                         proc_run("php", "include/notifier.php", "comment-import", $message_id);
 916                 }
 917
 918                 return $message_id;
 919         }
 920
 921         private function receive_conversation_message($importer, $contact, $data, $msg, $mesg) {
 922                 $guid = notags(unxmlify($data->guid));
 923                 $subject = notags(unxmlify($data->subject));
 924                 $author = notags(unxmlify($data->author));
 925
 926                 $reply = 0;
 927
 928                 $msg_guid = notags(unxmlify($mesg->guid));
 929                 $msg_parent_guid = notags(unxmlify($mesg->parent_guid));
 930                 $msg_parent_author_signature = notags(unxmlify($mesg->parent_author_signature));
 931                 $msg_author_signature = notags(unxmlify($mesg->author_signature));
 932                 $msg_text = unxmlify($mesg->text);
 933                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
 934
 935                 // "diaspora_handle" is the element name from the old version
 936                 // "author" is the element name from the new version
 937                 if ($mesg->author)
 938                         $msg_author = notags(unxmlify($mesg->author));
 939                 elseif ($mesg->diaspora_handle)
 940                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
 941                 else
 942                         return false;
 943
 944                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
 945
 946                 if($msg_conversation_guid != $guid) {
 947                         logger("message conversation guid does not belong to the current conversation.");
 948                         return false;
 949                 }
 950
 951                 $body = diaspora2bb($msg_text);
 952                 $message_uri = $msg_author.":".$msg_guid;
 953
 954                 $author_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
 955
 956                 $author_signature = base64_decode($msg_author_signature);
 957
 958                 if(strcasecmp($msg_author,$msg["author"]) == 0) {
 959                         $person = $contact;
 960                         $key = $msg["key"];
 961                 } else {
 962                         $person = self::person_by_handle($msg_author);
 963
 964                         if (is_array($person) && x($person, "pubkey"))
 965                                 $key = $person["pubkey"];
 966                         else {
 967                                 logger("unable to find author details");
 968                                         return false;
 969                         }
 970                 }
 971
 972                 if (!rsa_verify($author_signed_data, $author_signature, $key, "sha256")) {
 973                         logger("verification failed.");
 974                         return false;
 975                 }
 976
 977                 if($msg_parent_author_signature) {
 978                         $owner_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
 979
 980                         $parent_author_signature = base64_decode($msg_parent_author_signature);
 981
 982                         $key = $msg["key"];
 983
 984                         if (!rsa_verify($owner_signed_data, $parent_author_signature, $key, "sha256")) {
 985                                 logger("owner verification failed.");
 986                                 return false;
 987                         }
 988                 }
 989
 990                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' LIMIT 1",
 991                         dbesc($message_uri)
 992                 );
 993                 if($r) {
 994                         logger("duplicate message already delivered.", LOGGER_DEBUG);
 995                         return false;
 996                 }
 997
 998                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
 999                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1000                         intval($importer["uid"]),
1001                         dbesc($msg_guid),
1002                         intval($conversation["id"]),
1003                         dbesc($person["name"]),
1004                         dbesc($person["photo"]),
1005                         dbesc($person["url"]),
1006                         intval($contact["id"]),
1007                         dbesc($subject),
1008                         dbesc($body),
1009                         0,
1010                         0,
1011                         dbesc($message_uri),
1012                         dbesc($author.":".$guid),
1013                         dbesc($msg_created_at)
1014                 );
1015
1016                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1017                         dbesc(datetime_convert()),
1018                         intval($conversation["id"])
1019                 );
1020
1021                 notification(array(
1022                         "type" => NOTIFY_MAIL,
1023                         "notify_flags" => $importer["notify-flags"],
1024                         "language" => $importer["language"],
1025                         "to_name" => $importer["username"],
1026                         "to_email" => $importer["email"],
1027                         "uid" =>$importer["uid"],
1028                         "item" => array("subject" => $subject, "body" => $body),
1029                         "source_name" => $person["name"],
1030                         "source_link" => $person["url"],
1031                         "source_photo" => $person["thumb"],
1032                         "verb" => ACTIVITY_POST,
1033                         "otype" => "mail"
1034                 ));
1035         }
1036
1037         private function receive_conversation($importer, $msg, $data) {
1038                 $guid = notags(unxmlify($data->guid));
1039                 $subject = notags(unxmlify($data->subject));
1040                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1041                 $author = notags(unxmlify($data->author));
1042                 $participants = notags(unxmlify($data->participants));
1043
1044                 $messages = $data->message;
1045
1046                 if (!count($messages)) {
1047                         logger("empty conversation");
1048                         return false;
1049                 }
1050
1051                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1052                 if (!$contact)
1053                         return false;
1054
1055                 $conversation = null;
1056
1057                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1058                         intval($importer["uid"]),
1059                         dbesc($guid)
1060                 );
1061                 if($c)
1062                         $conversation = $c[0];
1063                 else {
1064                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1065                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1066                                 intval($importer["uid"]),
1067                                 dbesc($guid),
1068                                 dbesc($author),
1069                                 dbesc(datetime_convert("UTC", "UTC", $created_at)),
1070                                 dbesc(datetime_convert()),
1071                                 dbesc($subject),
1072                                 dbesc($participants)
1073                         );
1074                         if($r)
1075                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1076                                         intval($importer["uid"]),
1077                                         dbesc($guid)
1078                                 );
1079
1080                         if($c)
1081                                 $conversation = $c[0];
1082                 }
1083                 if (!$conversation) {
1084                         logger("unable to create conversation.");
1085                         return;
1086                 }
1087
1088                 foreach($messages as $mesg)
1089                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg);
1090
1091                 return true;
1092         }
1093
1094         private function construct_like_body($contact, $parent_item, $guid) {
1095                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1096
1097                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1098                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1099                 $plink = "[url=".App::get_baseurl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1100
1101                 return sprintf($bodyverb, $ulink, $alink, $plink);
1102         }
1103
1104         private function construct_like_object($importer, $parent_item) {
1105                 $objtype = ACTIVITY_OBJ_NOTE;
1106                 $link = '<link rel="alternate" type="text/html" href="'.App::get_baseurl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1107                 $parent_body = $parent_item["body"];
1108
1109                 $xmldata = array("object" => array("type" => $objtype,
1110                                                 "local" => "1",
1111                                                 "id" => $parent_item["uri"],
1112                                                 "link" => $link,
1113                                                 "title" => "",
1114                                                 "content" => $parent_body));
1115
1116                 return xml::from_array($xmldata, $xml, true);
1117         }
1118
1119         private function receive_like($importer, $sender, $data) {
1120                 $positive = notags(unxmlify($data->positive));
1121                 $guid = notags(unxmlify($data->guid));
1122                 $parent_type = notags(unxmlify($data->parent_type));
1123                 $parent_guid = notags(unxmlify($data->parent_guid));
1124                 $author = notags(unxmlify($data->author));
1125
1126                 // likes on comments aren't supported by Diaspora - only on posts
1127                 // But maybe this will be supported in the future, so we will accept it.
1128                 if (!in_array($parent_type, array("Post", "Comment")))
1129                         return false;
1130
1131                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1132                 if (!$contact)
1133                         return false;
1134
1135                 if (self::message_exists($importer["uid"], $guid))
1136                         return false;
1137
1138                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1139                 if (!$parent_item)
1140                         return false;
1141
1142                 $person = self::person_by_handle($author);
1143                 if (!is_array($person)) {
1144                         logger("unable to find author details");
1145                         return false;
1146                 }
1147
1148                 // Fetch the contact id - if we know this contact
1149                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1150
1151                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1152                 // We would accept this anyhow.
1153                 if ($positive === "true")
1154                         $verb = ACTIVITY_LIKE;
1155                 else
1156                         $verb = ACTIVITY_DISLIKE;
1157
1158                 $datarray = array();
1159
1160                 $datarray["uid"] = $importer["uid"];
1161                 $datarray["contact-id"] = $author_contact["cid"];
1162                 $datarray["network"]  = $author_contact["network"];
1163
1164                 $datarray["author-name"] = $person["name"];
1165                 $datarray["author-link"] = $person["url"];
1166                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1167
1168                 $datarray["owner-name"] = $contact["name"];
1169                 $datarray["owner-link"] = $contact["url"];
1170                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1171
1172                 $datarray["guid"] = $guid;
1173                 $datarray["uri"] = $author.":".$guid;
1174
1175                 $datarray["type"] = "activity";
1176                 $datarray["verb"] = $verb;
1177                 $datarray["gravity"] = GRAVITY_LIKE;
1178                 $datarray["parent-uri"] = $parent_item["uri"];
1179
1180                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1181                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1182
1183                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1184
1185                 $message_id = item_store($datarray);
1186
1187                 if ($message_id)
1188                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1189
1190                 // If we are the origin of the parent we store the original data and notify our followers
1191                 if($message_id AND $parent_item["origin"]) {
1192
1193                         // Formerly we stored the signed text, the signature and the author in different fields.
1194                         // We now store the raw data so that we are more flexible.
1195                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1196                                 intval($message_id),
1197                                 dbesc(json_encode($data))
1198                         );
1199
1200                         // notify others
1201                         proc_run("php", "include/notifier.php", "comment-import", $message_id);
1202                 }
1203
1204                 return $message_id;
1205         }
1206
1207         private function receive_message($importer, $data) {
1208                 $guid = notags(unxmlify($data->guid));
1209                 $parent_guid = notags(unxmlify($data->parent_guid));
1210                 $text = unxmlify($data->text);
1211                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1212                 $author = notags(unxmlify($data->author));
1213                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1214
1215                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1216                 if (!$contact)
1217                         return false;
1218
1219                 $conversation = null;
1220
1221                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1222                         intval($importer["uid"]),
1223                         dbesc($conversation_guid)
1224                 );
1225                 if($c)
1226                         $conversation = $c[0];
1227                 else {
1228                         logger("conversation not available.");
1229                         return false;
1230                 }
1231
1232                 $reply = 0;
1233
1234                 $body = diaspora2bb($text);
1235                 $message_uri = $author.":".$guid;
1236
1237                 $person = self::person_by_handle($author);
1238                 if (!$person) {
1239                         logger("unable to find author details");
1240                         return false;
1241                 }
1242
1243                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
1244                         dbesc($message_uri),
1245                         intval($importer["uid"])
1246                 );
1247                 if($r) {
1248                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1249                         return false;
1250                 }
1251
1252                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1253                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1254                         intval($importer["uid"]),
1255                         dbesc($guid),
1256                         intval($conversation["id"]),
1257                         dbesc($person["name"]),
1258                         dbesc($person["photo"]),
1259                         dbesc($person["url"]),
1260                         intval($contact["id"]),
1261                         dbesc($conversation["subject"]),
1262                         dbesc($body),
1263                         0,
1264                         1,
1265                         dbesc($message_uri),
1266                         dbesc($author.":".$parent_guid),
1267                         dbesc($created_at)
1268                 );
1269
1270                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1271                         dbesc(datetime_convert()),
1272                         intval($conversation["id"])
1273                 );
1274
1275                 return true;
1276         }
1277
1278         private function receive_participation($importer, $data) {
1279                 // I'm not sure if we can fully support this message type
1280                 return true;
1281         }
1282
1283         private function receive_photo($importer, $data) {
1284                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
1285                 return true;
1286         }
1287
1288         private function receive_poll_participation($importer, $data) {
1289                 // We don't support polls by now
1290                 return true;
1291         }
1292
1293         private function receive_profile($importer, $data) {
1294                 $author = notags(unxmlify($data->author));
1295
1296                 $contact = self::contact_by_handle($importer["uid"], $author);
1297                 if (!$contact)
1298                         return;
1299
1300                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
1301                 $image_url = unxmlify($data->image_url);
1302                 $birthday = unxmlify($data->birthday);
1303                 $location = diaspora2bb(unxmlify($data->location));
1304                 $about = diaspora2bb(unxmlify($data->bio));
1305                 $gender = unxmlify($data->gender);
1306                 $searchable = (unxmlify($data->searchable) == "true");
1307                 $nsfw = (unxmlify($data->nsfw) == "true");
1308                 $tags = unxmlify($data->tag_string);
1309
1310                 $tags = explode("#", $tags);
1311
1312                 $keywords = array();
1313                 foreach ($tags as $tag) {
1314                         $tag = trim(strtolower($tag));
1315                         if ($tag != "")
1316                                 $keywords[] = $tag;
1317                 }
1318
1319                 $keywords = implode(", ", $keywords);
1320
1321                 $handle_parts = explode("@", $author);
1322                 $nick = $handle_parts[0];
1323
1324                 if($name === "")
1325                         $name = $handle_parts[0];
1326
1327                 if( preg_match("|^https?://|", $image_url) === 0)
1328                         $image_url = "http://".$handle_parts[1].$image_url;
1329
1330                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
1331
1332                 // Generic birthday. We don't know the timezone. The year is irrelevant.
1333
1334                 $birthday = str_replace("1000", "1901", $birthday);
1335
1336                 if ($birthday != "")
1337                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
1338
1339                 // this is to prevent multiple birthday notifications in a single year
1340                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
1341
1342                 if(substr($birthday,5) === substr($contact["bd"],5))
1343                         $birthday = $contact["bd"];
1344
1345                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
1346                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
1347                         dbesc($name),
1348                         dbesc($nick),
1349                         dbesc($author),
1350                         dbesc(datetime_convert()),
1351                         dbesc($birthday),
1352                         dbesc($location),
1353                         dbesc($about),
1354                         dbesc($keywords),
1355                         dbesc($gender),
1356                         intval($contact["id"]),
1357                         intval($importer["uid"])
1358                 );
1359
1360                 if ($searchable) {
1361                         poco_check($contact["url"], $name, NETWORK_DIASPORA, $image_url, $about, $location, $gender, $keywords, "",
1362                                 datetime_convert(), 2, $contact["id"], $importer["uid"]);
1363                 }
1364
1365                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
1366                                         "photo" => $image_url, "name" => $name, "location" => $location,
1367                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
1368                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
1369                                         "hide" => !$searchable, "nsfw" => $nsfw);
1370
1371                 update_gcontact($gcontact);
1372
1373                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
1374
1375                 return true;
1376         }
1377
1378         private function receive_request_make_friend($importer, $contact) {
1379
1380                 $a = get_app();
1381
1382                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1383                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
1384                                 intval(CONTACT_IS_FRIEND),
1385                                 intval($contact["id"]),
1386                                 intval($importer["uid"])
1387                         );
1388                 }
1389                 // send notification
1390
1391                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
1392                         intval($importer["uid"])
1393                 );
1394
1395                 if($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(get_pconfig($importer["uid"], "system", "post_newfriend"))) {
1396
1397                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
1398                                 intval($importer["uid"])
1399                         );
1400
1401                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
1402
1403                         if($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
1404
1405                                 $arr = array();
1406                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
1407                                 $arr["uid"] = $importer["uid"];
1408                                 $arr["contact-id"] = $self[0]["id"];
1409                                 $arr["wall"] = 1;
1410                                 $arr["type"] = 'wall';
1411                                 $arr["gravity"] = 0;
1412                                 $arr["origin"] = 1;
1413                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
1414                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
1415                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
1416                                 $arr["verb"] = ACTIVITY_FRIEND;
1417                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
1418
1419                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
1420                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1421                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
1422                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
1423
1424                                 $arr["object"] = "<object><type>".ACTIVITY_OBJ_PERSON."</type><title>".$contact["name"]."</title>"
1425                                         ."<id>".$contact["url"]."/".$contact["name"]."</id>";
1426                                 $arr["object"] .= "<link>".xmlify('<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n");
1427                                 $arr["object"] .= xmlify('<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n");
1428                                 $arr["object"] .= "</link></object>\n";
1429                                 $arr["last-child"] = 1;
1430
1431                                 $arr["allow_cid"] = $user[0]["allow_cid"];
1432                                 $arr["allow_gid"] = $user[0]["allow_gid"];
1433                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
1434                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
1435
1436                                 $i = item_store($arr);
1437                                 if($i)
1438                                         proc_run("php", "include/notifier.php", "activity", $i);
1439
1440                         }
1441
1442                 }
1443         }
1444
1445         private function receive_request($importer, $data) {
1446                 $author = unxmlify($data->author);
1447                 $recipient = unxmlify($data->recipient);
1448
1449                 if (!$author || !$recipient)
1450                         return;
1451
1452                 $contact = self::contact_by_handle($importer["uid"],$author);
1453
1454                 if($contact) {
1455
1456                         // perhaps we were already sharing with this person. Now they're sharing with us.
1457                         // That makes us friends.
1458
1459                         self::receive_request_make_friend($importer, $contact);
1460                         return true;
1461                 }
1462
1463                 $ret = self::person_by_handle($author);
1464
1465                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
1466                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
1467                         return false;
1468                 }
1469
1470                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
1471
1472                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
1473                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
1474                         intval($importer["uid"]),
1475                         dbesc($ret["network"]),
1476                         dbesc($ret["addr"]),
1477                         datetime_convert(),
1478                         dbesc($ret["url"]),
1479                         dbesc(normalise_link($ret["url"])),
1480                         dbesc($batch),
1481                         dbesc($ret["name"]),
1482                         dbesc($ret["nick"]),
1483                         dbesc($ret["photo"]),
1484                         dbesc($ret["pubkey"]),
1485                         dbesc($ret["notify"]),
1486                         dbesc($ret["poll"]),
1487                         1,
1488                         2
1489                 );
1490
1491                 // find the contact record we just created
1492
1493                 $contact_record = self::contact_by_handle($importer["uid"],$author);
1494
1495                 if (!$contact_record) {
1496                         logger("unable to locate newly created contact record.");
1497                         return;
1498                 }
1499
1500                 $g = q("SELECT `def_gid` FROM `user` WHERE `uid` = %d LIMIT 1",
1501                         intval($importer["uid"])
1502                 );
1503
1504                 if($g && intval($g[0]["def_gid"]))
1505                         group_add_member($importer["uid"], "", $contact_record["id"], $g[0]["def_gid"]);
1506
1507                 if($importer["page-flags"] == PAGE_NORMAL) {
1508
1509                         $hash = random_string().(string)time();   // Generate a confirm_key
1510
1511                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
1512                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
1513                                 intval($importer["uid"]),
1514                                 intval($contact_record["id"]),
1515                                 0,
1516                                 0,
1517                                 dbesc(t("Sharing notification from Diaspora network")),
1518                                 dbesc($hash),
1519                                 dbesc(datetime_convert())
1520                         );
1521                 } else {
1522
1523                         // automatic friend approval
1524
1525                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
1526
1527                         // technically they are sharing with us (CONTACT_IS_SHARING),
1528                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
1529                         // we are going to change the relationship and make them a follower.
1530
1531                         if($importer["page-flags"] == PAGE_FREELOVE)
1532                                 $new_relation = CONTACT_IS_FRIEND;
1533                         else
1534                                 $new_relation = CONTACT_IS_FOLLOWER;
1535
1536                         $r = q("UPDATE `contact` SET `rel` = %d,
1537                                 `name-date` = '%s',
1538                                 `uri-date` = '%s',
1539                                 `blocked` = 0,
1540                                 `pending` = 0,
1541                                 `writable` = 1
1542                                 WHERE `id` = %d
1543                                 ",
1544                                 intval($new_relation),
1545                                 dbesc(datetime_convert()),
1546                                 dbesc(datetime_convert()),
1547                                 intval($contact_record["id"])
1548                         );
1549
1550                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
1551                         if($u)
1552                                 $ret = self::send_share($u[0], $contact_record);
1553                 }
1554
1555                 return true;
1556         }
1557
1558         private function original_item($guid, $orig_author, $author) {
1559
1560                 // Do we already have this item?
1561                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
1562                                 `author-name`, `author-link`, `author-avatar`
1563                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
1564                         dbesc($guid));
1565
1566                 if($r) {
1567                         logger("reshared message ".$guid." already exists on system.");
1568
1569                         // Maybe it is already a reshared item?
1570                         // Then refetch the content, since there can be many side effects with reshared posts from other networks or reshares from reshares
1571                         if (self::is_reshare($r[0]["body"]))
1572                                 $r = array();
1573                         else
1574                                 return $r[0];
1575                 }
1576
1577                 if (!$r) {
1578                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
1579                         logger("1st try: reshared message ".$guid." will be fetched from original server: ".$server);
1580                         $item_id = self::store_by_guid($guid, $server);
1581
1582                         if (!$item_id) {
1583                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
1584                                 logger("2nd try: reshared message ".$guid." will be fetched from original server: ".$server);
1585                                 $item_id = self::store_by_guid($guid, $server);
1586                         }
1587
1588                         // Deactivated by now since there is a risk that someone could manipulate postings through this method
1589 /*                      if (!$item_id) {
1590                                 $server = "https://".substr($author, strpos($author, "@") + 1);
1591                                 logger("3rd try: reshared message ".$guid." will be fetched from sharer's server: ".$server);
1592                                 $item_id = self::store_by_guid($guid, $server);
1593                         }
1594                         if (!$item_id) {
1595                                 $server = "http://".substr($author, strpos($author, "@") + 1);
1596                                 logger("4th try: reshared message ".$guid." will be fetched from sharer's server: ".$server);
1597                                 $item_id = self::store_by_guid($guid, $server);
1598                         }
1599 */
1600                         if ($item_id) {
1601                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
1602                                                 `author-name`, `author-link`, `author-avatar`
1603                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
1604                                         intval($item_id));
1605
1606                                 if ($r)
1607                                         return $r[0];
1608
1609                         }
1610                 }
1611                 return false;
1612         }
1613
1614         private function receive_reshare($importer, $data) {
1615                 $root_author = notags(unxmlify($data->root_author));
1616                 $root_guid = notags(unxmlify($data->root_guid));
1617                 $guid = notags(unxmlify($data->guid));
1618                 $author = notags(unxmlify($data->author));
1619                 $public = notags(unxmlify($data->public));
1620                 $created_at = notags(unxmlify($data->created_at));
1621
1622                 $contact = self::allowed_contact_by_handle($importer, $author, false);
1623                 if (!$contact)
1624                         return false;
1625
1626                 if (self::message_exists($importer["uid"], $guid))
1627                         return false;
1628
1629                 $original_item = self::original_item($root_guid, $root_author, $author);
1630                 if (!$original_item)
1631                         return false;
1632
1633                 $orig_url = App::get_baseurl()."/display/".$original_item["guid"];
1634
1635                 $datarray = array();
1636
1637                 $datarray["uid"] = $importer["uid"];
1638                 $datarray["contact-id"] = $contact["id"];
1639                 $datarray["network"]  = NETWORK_DIASPORA;
1640
1641                 $datarray["author-name"] = $contact["name"];
1642                 $datarray["author-link"] = $contact["url"];
1643                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1644
1645                 $datarray["owner-name"] = $datarray["author-name"];
1646                 $datarray["owner-link"] = $datarray["author-link"];
1647                 $datarray["owner-avatar"] = $datarray["author-avatar"];
1648
1649                 $datarray["guid"] = $guid;
1650                 $datarray["uri"] = $datarray["parent-uri"] = $author.":".$guid;
1651
1652                 $datarray["verb"] = ACTIVITY_POST;
1653                 $datarray["gravity"] = GRAVITY_PARENT;
1654
1655                 $datarray["object"] = json_encode($data);
1656
1657                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
1658                                         $original_item["guid"], $original_item["created"], $orig_url);
1659                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
1660
1661                 $datarray["tag"] = $original_item["tag"];
1662                 $datarray["app"]  = $original_item["app"];
1663
1664                 $datarray["plink"] = self::plink($author, $guid);
1665                 $datarray["private"] = (($public == "false") ? 1 : 0);
1666                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = datetime_convert("UTC", "UTC", $created_at);
1667
1668                 $datarray["object-type"] = $original_item["object-type"];
1669
1670                 self::fetch_guid($datarray);
1671                 $message_id = item_store($datarray);
1672
1673                 if ($message_id)
1674                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1675
1676                 return $message_id;
1677         }
1678
1679         private function item_retraction($importer, $contact, $data) {
1680                 $target_type = notags(unxmlify($data->target_type));
1681                 $target_guid = notags(unxmlify($data->target_guid));
1682                 $author = notags(unxmlify($data->author));
1683
1684                 $person = self::person_by_handle($author);
1685                 if (!is_array($person)) {
1686                         logger("unable to find author detail for ".$author);
1687                         return false;
1688                 }
1689
1690                 $r = q("SELECT `id`, `parent`, `parent-uri`, `author-link` FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
1691                         dbesc($target_guid),
1692                         intval($importer["uid"])
1693                 );
1694                 if (!$r)
1695                         return false;
1696
1697                 // Only delete it if the author really fits
1698                 if (!link_compare($r[0]["author-link"], $person["url"])) {
1699                         logger("Item author ".$r[0]["author-link"]." doesn't fit to expected contact ".$person["url"], LOGGER_DEBUG);
1700                         return false;
1701                 }
1702
1703                 // Check if the sender is the thread owner
1704                 $p = q("SELECT `id`, `author-link`, `origin` FROM `item` WHERE `id` = %d",
1705                         intval($r[0]["parent"]));
1706
1707                 // Only delete it if the parent author really fits
1708                 if (!link_compare($p[0]["author-link"], $contact["url"]) AND !link_compare($r[0]["author-link"], $contact["url"])) {
1709                         logger("Thread author ".$p[0]["author-link"]." and item author ".$r[0]["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
1710                         return false;
1711                 }
1712
1713                 // 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
1714                 q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' WHERE `id` = %d",
1715                         dbesc(datetime_convert()),
1716                         dbesc(datetime_convert()),
1717                         intval($r[0]["id"])
1718                 );
1719                 delete_thread($r[0]["id"], $r[0]["parent-uri"]);
1720
1721                 logger("Deleted target ".$target_guid." (".$r[0]["id"].") from user ".$importer["uid"]." parent: ".$p[0]["id"], LOGGER_DEBUG);
1722
1723                 // Now check if the retraction needs to be relayed by us
1724                 if($p[0]["origin"]) {
1725
1726                         // Formerly we stored the signed text, the signature and the author in different fields.
1727                         // We now store the raw data so that we are more flexible.
1728                         q("INSERT INTO `sign` (`retract_iid`,`signed_text`) VALUES (%d,'%s')",
1729                                 intval($r[0]["id"]),
1730                                 dbesc(json_encode($data))
1731                         );
1732                         $s = q("select * from sign where retract_iid = %d", intval($r[0]["id"]));
1733                         logger("Stored signatur for item ".$r[0]["id"]." - ".print_r($s, true), LOGGER_DEBUG);
1734
1735                         // notify others
1736                         proc_run("php", "include/notifier.php", "drop", $r[0]["id"]);
1737                 }
1738         }
1739
1740         private function receive_retraction($importer, $sender, $data) {
1741                 $target_type = notags(unxmlify($data->target_type));
1742
1743                 $contact = self::contact_by_handle($importer["uid"], $sender);
1744                 if (!$contact) {
1745                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
1746                         return false;
1747                 }
1748
1749                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
1750
1751                 switch ($target_type) {
1752                         case "Comment":
1753                         case "Like":
1754                         case "Post": // "Post" will be supported in a future version
1755                         case "Reshare":
1756                         case "StatusMessage":
1757                                 return self::item_retraction($importer, $contact, $data);;
1758
1759                         case "Person":
1760                                 /// @todo What should we do with an "unshare"?
1761                                 // Removing the contact isn't correct since we still can read the public items
1762                                 //contact_remove($contact["id"]);
1763                                 return true;
1764
1765                         default:
1766                                 logger("Unknown target type ".$target_type);
1767                                 return false;
1768                 }
1769                 return true;
1770         }
1771
1772         private function receive_status_message($importer, $data) {
1773
1774                 $raw_message = unxmlify($data->raw_message);
1775                 $guid = notags(unxmlify($data->guid));
1776                 $author = notags(unxmlify($data->author));
1777                 $public = notags(unxmlify($data->public));
1778                 $created_at = notags(unxmlify($data->created_at));
1779                 $provider_display_name = notags(unxmlify($data->provider_display_name));
1780
1781                 /// @todo enable support for polls
1782                 //if ($data->poll) {
1783                 //      foreach ($data->poll AS $poll)
1784                 //              print_r($poll);
1785                 //      die("poll!\n");
1786                 //}
1787                 $contact = self::allowed_contact_by_handle($importer, $author, false);
1788                 if (!$contact)
1789                         return false;
1790
1791                 if (self::message_exists($importer["uid"], $guid))
1792                         return false;
1793
1794                 $address = array();
1795                 if ($data->location)
1796                         foreach ($data->location->children() AS $fieldname => $data)
1797                                 $address[$fieldname] = notags(unxmlify($data));
1798
1799                 $body = diaspora2bb($raw_message);
1800
1801                 $datarray = array();
1802
1803                 if ($data->photo) {
1804                         foreach ($data->photo AS $photo)
1805                                 $body = "[img]".$photo->remote_photo_path.$photo->remote_photo_name."[/img]\n".$body;
1806
1807                         $datarray["object-type"] = ACTIVITY_OBJ_PHOTO;
1808                 } else {
1809                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1810
1811                         // Add OEmbed and other information to the body
1812                         if (!self::is_redmatrix($contact["url"]))
1813                                 $body = add_page_info_to_body($body, false, true);
1814                 }
1815
1816                 $datarray["uid"] = $importer["uid"];
1817                 $datarray["contact-id"] = $contact["id"];
1818                 $datarray["network"] = NETWORK_DIASPORA;
1819
1820                 $datarray["author-name"] = $contact["name"];
1821                 $datarray["author-link"] = $contact["url"];
1822                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1823
1824                 $datarray["owner-name"] = $datarray["author-name"];
1825                 $datarray["owner-link"] = $datarray["author-link"];
1826                 $datarray["owner-avatar"] = $datarray["author-avatar"];
1827
1828                 $datarray["guid"] = $guid;
1829                 $datarray["uri"] = $datarray["parent-uri"] = $author.":".$guid;
1830
1831                 $datarray["verb"] = ACTIVITY_POST;
1832                 $datarray["gravity"] = GRAVITY_PARENT;
1833
1834                 $datarray["object"] = json_encode($data);
1835
1836                 $datarray["body"] = $body;
1837
1838                 if ($provider_display_name != "")
1839                         $datarray["app"] = $provider_display_name;
1840
1841                 $datarray["plink"] = self::plink($author, $guid);
1842                 $datarray["private"] = (($public == "false") ? 1 : 0);
1843                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = datetime_convert("UTC", "UTC", $created_at);
1844
1845                 if (isset($address["address"]))
1846                         $datarray["location"] = $address["address"];
1847
1848                 if (isset($address["lat"]) AND isset($address["lng"]))
1849                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
1850
1851                 self::fetch_guid($datarray);
1852                 $message_id = item_store($datarray);
1853
1854                 if ($message_id)
1855                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1856
1857                 return $message_id;
1858         }
1859
1860         /******************************************************************************************
1861          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
1862          ******************************************************************************************/
1863
1864         private function my_handle($me) {
1865                 if ($contact["addr"] != "")
1866                         return $contact["addr"];
1867
1868                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
1869                 // So - just in case - we build the the address here.
1870                 return $me["nickname"]."@".substr(App::get_baseurl(), strpos(App::get_baseurl(),"://") + 3);
1871         }
1872
1873         private function build_public_message($msg, $user, $contact, $prvkey, $pubkey) {
1874
1875                 logger("Message: ".$msg, LOGGER_DATA);
1876
1877                 $handle = self::my_handle($user);
1878
1879                 $b64url_data = base64url_encode($msg);
1880
1881                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
1882
1883                 $type = "application/xml";
1884                 $encoding = "base64url";
1885                 $alg = "RSA-SHA256";
1886
1887                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
1888
1889                 $signature = rsa_sign($signable_data,$prvkey);
1890                 $sig = base64url_encode($signature);
1891
1892                 $xmldata = array("diaspora" => array("header" => array("author_id" => $handle),
1893                                                 "me:env" => array("me:encoding" => "base64url",
1894                                                                 "me:alg" => "RSA-SHA256",
1895                                                                 "me:data" => $data,
1896                                                                 "@attributes" => array("type" => "application/xml"),
1897                                                                 "me:sig" => $sig)));
1898
1899                 $namespaces = array("" => "https://joindiaspora.com/protocol",
1900                                 "me" => "http://salmon-protocol.org/ns/magic-env");
1901
1902                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
1903
1904                 logger("magic_env: ".$magic_env, LOGGER_DATA);
1905                 return $magic_env;
1906         }
1907
1908         private function build_private_message($msg, $user, $contact, $prvkey, $pubkey) {
1909
1910                 logger("Message: ".$msg, LOGGER_DATA);
1911
1912                 // without a public key nothing will work
1913
1914                 if (!$pubkey) {
1915                         logger("pubkey missing: contact id: ".$contact["id"]);
1916                         return false;
1917                 }
1918
1919                 $inner_aes_key = random_string(32);
1920                 $b_inner_aes_key = base64_encode($inner_aes_key);
1921                 $inner_iv = random_string(16);
1922                 $b_inner_iv = base64_encode($inner_iv);
1923
1924                 $outer_aes_key = random_string(32);
1925                 $b_outer_aes_key = base64_encode($outer_aes_key);
1926                 $outer_iv = random_string(16);
1927                 $b_outer_iv = base64_encode($outer_iv);
1928
1929                 $handle = self::my_handle($user);
1930
1931                 $padded_data = pkcs5_pad($msg,16);
1932                 $inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);
1933
1934                 $b64_data = base64_encode($inner_encrypted);
1935
1936
1937                 $b64url_data = base64url_encode($b64_data);
1938                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
1939
1940                 $type = "application/xml";
1941                 $encoding = "base64url";
1942                 $alg = "RSA-SHA256";
1943
1944                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
1945
1946                 $signature = rsa_sign($signable_data,$prvkey);
1947                 $sig = base64url_encode($signature);
1948
1949                 $xmldata = array("decrypted_header" => array("iv" => $b_inner_iv,
1950                                                         "aes_key" => $b_inner_aes_key,
1951                                                         "author_id" => $handle));
1952
1953                 $decrypted_header = xml::from_array($xmldata, $xml, true);
1954                 $decrypted_header = pkcs5_pad($decrypted_header,16);
1955
1956                 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
1957
1958                 $outer_json = json_encode(array("iv" => $b_outer_iv, "key" => $b_outer_aes_key));
1959
1960                 $encrypted_outer_key_bundle = "";
1961                 openssl_public_encrypt($outer_json, $encrypted_outer_key_bundle, $pubkey);
1962
1963                 $b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);
1964
1965                 logger("outer_bundle: ".$b64_encrypted_outer_key_bundle." key: ".$pubkey, LOGGER_DATA);
1966
1967                 $encrypted_header_json_object = json_encode(array("aes_key" => base64_encode($encrypted_outer_key_bundle),
1968                                                                 "ciphertext" => base64_encode($ciphertext)));
1969                 $cipher_json = base64_encode($encrypted_header_json_object);
1970
1971                 $xmldata = array("diaspora" => array("encrypted_header" => $cipher_json,
1972                                                 "me:env" => array("me:encoding" => "base64url",
1973                                                                 "me:alg" => "RSA-SHA256",
1974                                                                 "me:data" => $data,
1975                                                                 "@attributes" => array("type" => "application/xml"),
1976                                                                 "me:sig" => $sig)));
1977
1978                 $namespaces = array("" => "https://joindiaspora.com/protocol",
1979                                 "me" => "http://salmon-protocol.org/ns/magic-env");
1980
1981                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
1982
1983                 logger("magic_env: ".$magic_env, LOGGER_DATA);
1984                 return $magic_env;
1985         }
1986
1987         private function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
1988
1989                 if ($public)
1990                         $magic_env =  self::build_public_message($msg,$user,$contact,$prvkey,$pubkey);
1991                 else
1992                         $magic_env =  self::build_private_message($msg,$user,$contact,$prvkey,$pubkey);
1993
1994                 // The data that will be transmitted is double encoded via "urlencode", strange ...
1995                 $slap = "xml=".urlencode(urlencode($magic_env));
1996                 return $slap;
1997         }
1998
1999         private function signature($owner, $message) {
2000                 $sigmsg = $message;
2001                 unset($sigmsg["author_signature"]);
2002                 unset($sigmsg["parent_author_signature"]);
2003
2004                 $signed_text = implode(";", $sigmsg);
2005
2006                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2007         }
2008
2009         public static function transmit($owner, $contact, $slap, $public_batch, $queue_run=false, $guid = "") {
2010
2011                 $a = get_app();
2012
2013                 $enabled = intval(get_config("system", "diaspora_enabled"));
2014                 if(!$enabled)
2015                         return 200;
2016
2017                 $logid = random_string(4);
2018                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2019                 if (!$dest_url) {
2020                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2021                         return 0;
2022                 }
2023
2024                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2025
2026                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2027                         $return_code = 0;
2028                 } else {
2029                         if (!intval(get_config("system", "diaspora_test"))) {
2030                                 post_url($dest_url."/", $slap);
2031                                 $return_code = $a->get_curl_code();
2032                         } else {
2033                                 logger("test_mode");
2034                                 return 200;
2035                         }
2036                 }
2037
2038                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2039
2040                 if(!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2041                         logger("queue message");
2042
2043                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2044                                 intval($contact["id"]),
2045                                 dbesc(NETWORK_DIASPORA),
2046                                 dbesc($slap),
2047                                 intval($public_batch)
2048                         );
2049                         if($r) {
2050                                 logger("add_to_queue ignored - identical item already in queue");
2051                         } else {
2052                                 // queue message for redelivery
2053                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $slap, $public_batch);
2054                         }
2055                 }
2056
2057                 return(($return_code) ? $return_code : (-1));
2058         }
2059
2060
2061         private function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "") {
2062
2063                 $data = array("XML" => array("post" => array($type => $message)));
2064
2065                 $msg = xml::from_array($data, $xml);
2066
2067                 logger('message: '.$msg, LOGGER_DATA);
2068                 logger('send guid '.$guid, LOGGER_DEBUG);
2069
2070                 $slap = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
2071
2072                 $return_code = self::transmit($owner, $contact, $slap, $public_batch, false, $guid);
2073
2074                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
2075
2076                 return $return_code;
2077         }
2078
2079         public static function send_share($owner,$contact) {
2080
2081                 $message = array("sender_handle" => self::my_handle($owner),
2082                                 "recipient_handle" => $contact["addr"]);
2083
2084                 return self::build_and_transmit($owner, $contact, "request", $message);
2085         }
2086
2087         public static function send_unshare($owner,$contact) {
2088
2089                 $message = array("post_guid" => $owner["guid"],
2090                                 "diaspora_handle" => self::my_handle($owner),
2091                                 "type" => "Person");
2092
2093                 return self::build_and_transmit($owner, $contact, "retraction", $message);
2094         }
2095
2096         private function is_reshare($body) {
2097                 $body = trim($body);
2098
2099                 // Skip if it isn't a pure repeated messages
2100                 // Does it start with a share?
2101                 if (strpos($body, "[share") > 0)
2102                         return(false);
2103
2104                 // Does it end with a share?
2105                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
2106                         return(false);
2107
2108                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
2109                 // Skip if there is no shared message in there
2110                 if ($body == $attributes)
2111                         return(false);
2112
2113                 $guid = "";
2114                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
2115                 if ($matches[1] != "")
2116                         $guid = $matches[1];
2117
2118                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
2119                 if ($matches[1] != "")
2120                         $guid = $matches[1];
2121
2122                 if ($guid != "") {
2123                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
2124                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
2125                         if ($r) {
2126                                 $ret= array();
2127                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
2128                                 $ret["root_guid"] = $guid;
2129                                 return($ret);
2130                         }
2131                 }
2132
2133                 $profile = "";
2134                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
2135                 if ($matches[1] != "")
2136                         $profile = $matches[1];
2137
2138                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
2139                 if ($matches[1] != "")
2140                         $profile = $matches[1];
2141
2142                 $ret= array();
2143
2144                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
2145                 if (($ret["root_handle"] == $profile) OR ($ret["root_handle"] == ""))
2146                         return(false);
2147
2148                 $link = "";
2149                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
2150                 if ($matches[1] != "")
2151                         $link = $matches[1];
2152
2153                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
2154                 if ($matches[1] != "")
2155                         $link = $matches[1];
2156
2157                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
2158                 if (($ret["root_guid"] == $link) OR ($ret["root_guid"] == ""))
2159                         return(false);
2160                 return($ret);
2161         }
2162
2163         public static function send_status($item, $owner, $contact, $public_batch = false) {
2164
2165                 $myaddr = self::my_handle($owner);
2166
2167                 $public = (($item["private"]) ? "false" : "true");
2168
2169                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
2170
2171                 // Detect a share element and do a reshare
2172                 if (!$item['private'] AND ($ret = self::is_reshare($item["body"]))) {
2173                         $message = array("root_diaspora_id" => $ret["root_handle"],
2174                                         "root_guid" => $ret["root_guid"],
2175                                         "guid" => $item["guid"],
2176                                         "diaspora_handle" => $myaddr,
2177                                         "public" => $public,
2178                                         "created_at" => $created,
2179                                         "provider_display_name" => $item["app"]);
2180
2181                         $type = "reshare";
2182                 } else {
2183                         $title = $item["title"];
2184                         $body = $item["body"];
2185
2186                         // convert to markdown
2187                         $body = html_entity_decode(bb2diaspora($body));
2188
2189                         // Adding the title
2190                         if(strlen($title))
2191                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
2192
2193                         if ($item["attach"]) {
2194                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
2195                                 if(cnt) {
2196                                         $body .= "\n".t("Attachments:")."\n";
2197                                         foreach($matches as $mtch)
2198                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
2199                                 }
2200                         }
2201
2202                         $location = array();
2203
2204                         if ($item["location"] != "")
2205                                 $location["address"] = $item["location"];
2206
2207                         if ($item["coord"] != "") {
2208                                 $coord = explode(" ", $item["coord"]);
2209                                 $location["lat"] = $coord[0];
2210                                 $location["lng"] = $coord[1];
2211                         }
2212
2213                         $message = array("raw_message" => $body,
2214                                         "location" => $location,
2215                                         "guid" => $item["guid"],
2216                                         "diaspora_handle" => $myaddr,
2217                                         "public" => $public,
2218                                         "created_at" => $created,
2219                                         "provider_display_name" => $item["app"]);
2220
2221                         if (count($location) == 0)
2222                                 unset($message["location"]);
2223
2224                         $type = "status_message";
2225                 }
2226
2227                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2228         }
2229
2230         private function construct_like($item, $owner) {
2231
2232                 $myaddr = self::my_handle($owner);
2233
2234                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
2235                         dbesc($item["thr-parent"]));
2236                 if(!$p)
2237                         return false;
2238
2239                 $parent = $p[0];
2240
2241                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
2242                 $positive = "true";
2243
2244                 return(array("positive" => $positive,
2245                                 "guid" => $item["guid"],
2246                                 "target_type" => $target_type,
2247                                 "parent_guid" => $parent["guid"],
2248                                 "author_signature" => $authorsig,
2249                                 "diaspora_handle" => $myaddr));
2250         }
2251
2252         private function construct_comment($item, $owner) {
2253
2254                 $myaddr = self::my_handle($owner);
2255
2256                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
2257                         intval($item["parent"]),
2258                         intval($item["parent"])
2259                 );
2260
2261                 if (!$p)
2262                         return false;
2263
2264                 $parent = $p[0];
2265
2266                 $text = html_entity_decode(bb2diaspora($item["body"]));
2267
2268                 return(array("guid" => $item["guid"],
2269                                 "parent_guid" => $parent["guid"],
2270                                 "author_signature" => "",
2271                                 "text" => $text,
2272                                 "diaspora_handle" => $myaddr));
2273         }
2274
2275         public static function send_followup($item,$owner,$contact,$public_batch = false) {
2276
2277                 if($item['verb'] === ACTIVITY_LIKE) {
2278                         $message = self::construct_like($item, $owner);
2279                         $type = "like";
2280                 } else {
2281                         $message = self::construct_comment($item, $owner);
2282                         $type = "comment";
2283                 }
2284
2285                 if (!$message)
2286                         return false;
2287
2288                 $message["author_signature"] = self::signature($owner, $message);
2289
2290                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2291         }
2292
2293         private function message_from_signatur($item, $signature) {
2294
2295                 // Split the signed text
2296                 $signed_parts = explode(";", $signature['signed_text']);
2297
2298                 if ($item["deleted"])
2299                         $message = array("parent_author_signature" => "",
2300                                         "target_guid" => $signed_parts[0],
2301                                         "target_type" => $signed_parts[1],
2302                                         "sender_handle" => $signature['signer'],
2303                                         "target_author_signature" => $signature['signature']);
2304                 elseif ($item['verb'] === ACTIVITY_LIKE)
2305                         $message = array("positive" => $signed_parts[0],
2306                                         "guid" => $signed_parts[1],
2307                                         "target_type" => $signed_parts[2],
2308                                         "parent_guid" => $signed_parts[3],
2309                                         "parent_author_signature" => "",
2310                                         "author_signature" => $signature['signature'],
2311                                         "diaspora_handle" => $signed_parts[4]);
2312                 else {
2313                         // Remove the comment guid
2314                         $guid = array_shift($signed_parts);
2315
2316                         // Remove the parent guid
2317                         $parent_guid = array_shift($signed_parts);
2318
2319                         // Remove the handle
2320                         $handle = array_pop($signed_parts);
2321
2322                         // Glue the parts together
2323                         $text = implode(";", $signed_parts);
2324
2325                         $message = array("guid" => $guid,
2326                                         "parent_guid" => $parent_guid,
2327                                         "parent_author_signature" => "",
2328                                         "author_signature" => $signature['signature'],
2329                                         "text" => implode(";", $signed_parts),
2330                                         "diaspora_handle" => $handle);
2331                 }
2332                 return $message;
2333         }
2334
2335         public static function send_relay($item, $owner, $contact, $public_batch = false) {
2336
2337                 if ($item["deleted"]) {
2338                         $sql_sign_id = "retract_iid";
2339                         $type = "relayable_retraction";
2340                 } elseif ($item['verb'] === ACTIVITY_LIKE) {
2341                         $sql_sign_id = "iid";
2342                         $type = "like";
2343                 } else {
2344                         $sql_sign_id = "iid";
2345                         $type = "comment";
2346                 }
2347
2348                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
2349
2350                 // fetch the original signature
2351
2352                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `".$sql_sign_id."` = %d LIMIT 1",
2353                         intval($item["id"]));
2354
2355                 if (!$r)
2356                         return self::send_followup($item, $owner, $contact, $public_batch);
2357
2358                 $signature = $r[0];
2359
2360                 // Old way - is used by the internal Friendica functions
2361                 /// @todo Change all signatur storing functions to the new format
2362                 if ($signature['signed_text'] AND $signature['signature'] AND $signature['signer'])
2363                         $message = self::message_from_signatur($item, $signature);
2364                 else {// New way
2365                         $msg = json_decode($signature['signed_text'], true);
2366
2367                         $message = array();
2368                         foreach ($msg AS $field => $data) {
2369                                 if (!$item["deleted"]) {
2370                                         if ($field == "author")
2371                                                 $field = "diaspora_handle";
2372                                         if ($field == "parent_type")
2373                                                 $field = "target_type";
2374                                 }
2375
2376                                 $message[$field] = $data;
2377                         }
2378                 }
2379
2380                 if ($item["deleted"]) {
2381                         $signed_text = $message["target_guid"].';'.$message["target_type"];
2382                         $message["parent_author_signature"] = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2383                 } else
2384                         $message["parent_author_signature"] = self::signature($owner, $message);
2385
2386                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
2387
2388                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2389         }
2390
2391         public static function send_retraction($item, $owner, $contact, $public_batch = false) {
2392
2393                 $myaddr = self::my_handle($owner);
2394
2395                 // Check whether the retraction is for a top-level post or whether it's a relayable
2396                 if ($item["uri"] !== $item["parent-uri"]) {
2397                         $msg_type = "relayable_retraction";
2398                         $target_type = (($item["verb"] === ACTIVITY_LIKE) ? "Like" : "Comment");
2399                 } else {
2400                         $msg_type = "signed_retraction";
2401                         $target_type = "StatusMessage";
2402                 }
2403
2404                 $signed_text = $item["guid"].";".$target_type;
2405
2406                 $message = array("target_guid" => $item['guid'],
2407                                 "target_type" => $target_type,
2408                                 "sender_handle" => $myaddr,
2409                                 "target_author_signature" => base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')));
2410
2411                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
2412         }
2413
2414         public static function send_mail($item, $owner, $contact) {
2415
2416                 $myaddr = self::my_handle($owner);
2417
2418                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
2419                         intval($item["convid"]),
2420                         intval($item["uid"])
2421                 );
2422
2423                 if (!$r) {
2424                         logger("conversation not found.");
2425                         return;
2426                 }
2427                 $cnv = $r[0];
2428
2429                 $conv = array(
2430                         "guid" => $cnv["guid"],
2431                         "subject" => $cnv["subject"],
2432                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
2433                         "diaspora_handle" => $cnv["creator"],
2434                         "participant_handles" => $cnv["recips"]
2435                 );
2436
2437                 $body = bb2diaspora($item["body"]);
2438                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
2439
2440                 $signed_text = $item["guid"].";".$cnv["guid"].";".$body.";".$created.";".$myaddr.";".$cnv['guid'];
2441                 $sig = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2442
2443                 $msg = array(
2444                         "guid" => $item["guid"],
2445                         "parent_guid" => $cnv["guid"],
2446                         "parent_author_signature" => $sig,
2447                         "author_signature" => $sig,
2448                         "text" => $body,
2449                         "created_at" => $created,
2450                         "diaspora_handle" => $myaddr,
2451                         "conversation_guid" => $cnv["guid"]
2452                 );
2453
2454                 if ($item["reply"]) {
2455                         $message = $msg;
2456                         $type = "message";
2457                 } else {
2458                         $message = array("guid" => $cnv["guid"],
2459                                         "subject" => $cnv["subject"],
2460                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
2461                                         "message" => $msg,
2462                                         "diaspora_handle" => $cnv["creator"],
2463                                         "participant_handles" => $cnv["recips"]);
2464
2465                         $type = "conversation";
2466                 }
2467
2468                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
2469         }
2470 }
2471 ?>