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