include/diaspora.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 require_once("include/queue_fn.php");
  17
  18 /**
  19  * @brief This class contain functions to create and send Diaspora XML files
  20  *
  21  */
  22 class diaspora {
  23
  24         /**
  25          * @brief Return a list of relay servers
  26          *
  27          * This is an experimental Diaspora feature.
  28          *
  29          * @return array of relay servers
  30          */
  31         public static function relay_list() {
  32
  33                 $serverdata = get_config("system", "relay_server");
  34                 if ($serverdata == "")
  35                         return array();
  36
  37                 $relay = array();
  38
  39                 $servers = explode(",", $serverdata);
  40
  41                 foreach($servers AS $server) {
  42                         $server = trim($server);
  43                         $batch = $server."/receive/public";
  44
  45                         $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  46
  47                         if (!$relais) {
  48                                 $addr = "relay@".str_replace("http://", "", normalise_link($server));
  49
  50                                 $r = q("INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
  51                                         VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
  52                                         datetime_convert(),
  53                                         dbesc($addr),
  54                                         dbesc($addr),
  55                                         dbesc($server),
  56                                         dbesc(normalise_link($server)),
  57                                         dbesc($batch),
  58                                         dbesc(NETWORK_DIASPORA),
  59                                         intval(CONTACT_IS_FOLLOWER),
  60                                         dbesc(datetime_convert()),
  61                                         dbesc(datetime_convert()),
  62                                         dbesc(datetime_convert())
  63                                 );
  64
  65                                 $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  66                                 if ($relais)
  67                                         $relay[] = $relais[0];
  68                         } else
  69                                 $relay[] = $relais[0];
  70                 }
  71
  72                 return $relay;
  73         }
  74
  75         /**
  76          * @brief repairs a signature that was double encoded
  77          *
  78          * The function is unused at the moment. It was copied from the old implementation.
  79          *
  80          * @param string $signature The signature
  81          * @param string $handle The handle of the signature owner
  82          * @param integer $level This value is only set inside this function to avoid endless loops
  83          *
  84          * @return string the repaired signature
  85          */
  86         private function repair_signature($signature, $handle = "", $level = 1) {
  87
  88                 if ($signature == "")
  89                         return ($signature);
  90
  91                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
  92                         $signature = base64_decode($signature);
  93                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
  94
  95                         // Do a recursive call to be able to fix even multiple levels
  96                         if ($level < 10)
  97                                 $signature = self::repair_signature($signature, $handle, ++$level);
  98                 }
  99
 100                 return($signature);
 101         }
 102
 103         /**
 104          * @brief verify the envelope and return the verified data
 105          *
 106          * @param string $envelope The magic envelope
 107          *
 108          * @return string verified data
 109          */
 110         private function verify_magic_envelope($envelope) {
 111
 112                 $basedom = parse_xml_string($envelope, false);
 113
 114                 if (!is_object($basedom)) {
 115                         logger("Envelope is no XML file");
 116                         return false;
 117                 }
 118
 119                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 120
 121                 if (sizeof($children) == 0) {
 122                         logger("XML has no children");
 123                         return false;
 124                 }
 125
 126                 $handle = "";
 127
 128                 $data = base64url_decode($children->data);
 129                 $type = $children->data->attributes()->type[0];
 130
 131                 $encoding = $children->encoding;
 132
 133                 $alg = $children->alg;
 134
 135                 $sig = base64url_decode($children->sig);
 136                 $key_id = $children->sig->attributes()->key_id[0];
 137                 if ($key_id != "")
 138                         $handle = base64url_decode($key_id);
 139
 140                 $b64url_data = base64url_encode($data);
 141                 $msg = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
 142
 143                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 144
 145                 $key = self::key($handle);
 146
 147                 $verify = rsa_verify($signable_data, $sig, $key);
 148                 if (!$verify) {
 149                         logger('Message did not verify. Discarding.');
 150                         return false;
 151                 }
 152
 153                 return $data;
 154         }
 155
 156         /**
 157          * @brief: Decodes incoming Diaspora message
 158          *
 159          * @param array $importer Array of the importer user
 160          * @param string $xml urldecoded Diaspora salmon
 161          *
 162          * @return array
 163          * 'message' -> decoded Diaspora XML message
 164          * 'author' -> author diaspora handle
 165          * 'key' -> author public key (converted to pkcs#8)
 166          */
 167         public static function decode($importer, $xml) {
 168
 169                 $public = false;
 170                 $basedom = parse_xml_string($xml);
 171
 172                 if (!is_object($basedom))
 173                         return false;
 174
 175                 $children = $basedom->children('https://joindiaspora.com/protocol');
 176
 177                 if($children->header) {
 178                         $public = true;
 179                         $author_link = str_replace('acct:','',$children->header->author_id);
 180                 } else {
 181
 182                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 183
 184                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 185                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 186
 187                         $outer_key_bundle = '';
 188                         openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
 189
 190                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 191
 192                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 193                         $outer_key = base64_decode($j_outer_key_bundle->key);
 194
 195                         $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);
 196
 197
 198                         $decrypted = pkcs5_unpad($decrypted);
 199
 200                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 201                         $idom = parse_xml_string($decrypted,false);
 202
 203                         $inner_iv = base64_decode($idom->iv);
 204                         $inner_aes_key = base64_decode($idom->aes_key);
 205
 206                         $author_link = str_replace('acct:','',$idom->author_id);
 207                 }
 208
 209                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 210
 211                 // figure out where in the DOM tree our data is hiding
 212
 213                 if($dom->provenance->data)
 214                         $base = $dom->provenance;
 215                 elseif($dom->env->data)
 216                         $base = $dom->env;
 217                 elseif($dom->data)
 218                         $base = $dom;
 219
 220                 if (!$base) {
 221                         logger('unable to locate salmon data in xml');
 222                         http_status_exit(400);
 223                 }
 224
 225
 226                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 227                 $signature = base64url_decode($base->sig);
 228
 229                 // unpack the  data
 230
 231                 // strip whitespace so our data element will return to one big base64 blob
 232                 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
 233
 234
 235                 // stash away some other stuff for later
 236
 237                 $type = $base->data[0]->attributes()->type[0];
 238                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 239                 $encoding = $base->encoding;
 240                 $alg = $base->alg;
 241
 242
 243                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 244
 245
 246                 // decode the data
 247                 $data = base64url_decode($data);
 248
 249
 250                 if($public)
 251                         $inner_decrypted = $data;
 252                 else {
 253
 254                         // Decode the encrypted blob
 255
 256                         $inner_encrypted = base64_decode($data);
 257                         $inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
 258                         $inner_decrypted = pkcs5_unpad($inner_decrypted);
 259                 }
 260
 261                 if (!$author_link) {
 262                         logger('Could not retrieve author URI.');
 263                         http_status_exit(400);
 264                 }
 265                 // Once we have the author URI, go to the web and try to find their public key
 266                 // (first this will look it up locally if it is in the fcontact cache)
 267                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 268
 269                 logger('Fetching key for '.$author_link);
 270                 $key = self::key($author_link);
 271
 272                 if (!$key) {
 273                         logger('Could not retrieve author key.');
 274                         http_status_exit(400);
 275                 }
 276
 277                 $verify = rsa_verify($signed_data,$signature,$key);
 278
 279                 if (!$verify) {
 280                         logger('Message did not verify. Discarding.');
 281                         http_status_exit(400);
 282                 }
 283
 284                 logger('Message verified.');
 285
 286                 return array('message' => (string)$inner_decrypted,
 287                                 'author' => unxmlify($author_link),
 288                                 'key' => (string)$key);
 289         }
 290
 291
 292         /**
 293          * @brief Dispatches public messages and find the fitting receivers
 294          *
 295          * @param array $msg The post that will be dispatched
 296          *
 297          * @return int The message id of the generated message, "true" or "false" if there was an error
 298          */
 299         public static function dispatch_public($msg) {
 300
 301                 $enabled = intval(get_config("system", "diaspora_enabled"));
 302                 if (!$enabled) {
 303                         logger("diaspora is disabled");
 304                         return false;
 305                 }
 306
 307                 // Use a dummy importer to import the data for the public copy
 308                 $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 309                 $message_id = self::dispatch($importer,$msg);
 310
 311                 // Now distribute it to the followers
 312                 $r = q("SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 313                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 314                         AND NOT `account_expired` AND NOT `account_removed`",
 315                         dbesc(NETWORK_DIASPORA),
 316                         dbesc($msg["author"])
 317                 );
 318                 if($r) {
 319                         foreach($r as $rr) {
 320                                 logger("delivering to: ".$rr["username"]);
 321                                 self::dispatch($rr,$msg);
 322                         }
 323                 } else
 324                         logger("No subscribers for ".$msg["author"]." ".print_r($msg, true));
 325
 326                 return $message_id;
 327         }
 328
 329         /**
 330          * @brief Dispatches the different message types to the different functions
 331          *
 332          * @param array $importer Array of the importer user
 333          * @param array $msg The post that will be dispatched
 334          *
 335          * @return int The message id of the generated message, "true" or "false" if there was an error
 336          */
 337         public static function dispatch($importer, $msg) {
 338
 339                 // The sender is the handle of the contact that sent the message.
 340                 // This will often be different with relayed messages (for example "like" and "comment")
 341                 $sender = $msg["author"];
 342
 343                 if (!diaspora::valid_posting($msg, $fields)) {
 344                         logger("Invalid posting");
 345                         return false;
 346                 }
 347
 348                 $type = $fields->getName();
 349
 350                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 351
 352                 switch ($type) {
 353                         case "account_deletion":
 354                                 return self::receive_account_deletion($importer, $fields);
 355
 356                         case "comment":
 357                                 return self::receive_comment($importer, $sender, $fields, $msg["message"]);
 358
 359                         case "contact":
 360                                 return self::receive_contact_request($importer, $fields);
 361
 362                         case "conversation":
 363                                 return self::receive_conversation($importer, $msg, $fields);
 364
 365                         case "like":
 366                                 return self::receive_like($importer, $sender, $fields);
 367
 368                         case "message":
 369                                 return self::receive_message($importer, $fields);
 370
 371                         case "participation": // Not implemented
 372                                 return self::receive_participation($importer, $fields);
 373
 374                         case "photo": // Not implemented
 375                                 return self::receive_photo($importer, $fields);
 376
 377                         case "poll_participation": // Not implemented
 378                                 return self::receive_poll_participation($importer, $fields);
 379
 380                         case "profile":
 381                                 return self::receive_profile($importer, $fields);
 382
 383                         case "reshare":
 384                                 return self::receive_reshare($importer, $fields, $msg["message"]);
 385
 386                         case "retraction":
 387                                 return self::receive_retraction($importer, $sender, $fields);
 388
 389                         case "status_message":
 390                                 return self::receive_status_message($importer, $fields, $msg["message"]);
 391
 392                         default:
 393                                 logger("Unknown message type ".$type);
 394                                 return false;
 395                 }
 396
 397                 return true;
 398         }
 399
 400         /**
 401          * @brief Checks if a posting is valid and fetches the data fields.
 402          *
 403          * This function does not only check the signature.
 404          * It also does the conversion between the old and the new diaspora format.
 405          *
 406          * @param array $msg Array with the XML, the sender handle and the sender signature
 407          * @param object $fields SimpleXML object that contains the posting when it is valid
 408          *
 409          * @return bool Is the posting valid?
 410          */
 411         private function valid_posting($msg, &$fields) {
 412
 413                 $data = parse_xml_string($msg["message"], false);
 414
 415                 if (!is_object($data)) {
 416                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 417                         return false;
 418                 }
 419
 420                 $first_child = $data->getName();
 421
 422                 // Is this the new or the old version?
 423                 if ($data->getName() == "XML") {
 424                         $oldXML = true;
 425                         foreach ($data->post->children() as $child)
 426                                 $element = $child;
 427                 } else {
 428                         $oldXML = false;
 429                         $element = $data;
 430                 }
 431
 432                 $type = $element->getName();
 433                 $orig_type = $type;
 434
 435                 // All retractions are handled identically from now on.
 436                 // In the new version there will only be "retraction".
 437                 if (in_array($type, array("signed_retraction", "relayable_retraction")))
 438                         $type = "retraction";
 439
 440                 if ($type == "request")
 441                         $type = "contact";
 442
 443                 $fields = new SimpleXMLElement("<".$type."/>");
 444
 445                 $signed_data = "";
 446
 447                 foreach ($element->children() AS $fieldname => $entry) {
 448                         if ($oldXML) {
 449                                 // Translation for the old XML structure
 450                                 if ($fieldname == "diaspora_handle")
 451                                         $fieldname = "author";
 452
 453                                 if ($fieldname == "participant_handles")
 454                                         $fieldname = "participants";
 455
 456                                 if (in_array($type, array("like", "participation"))) {
 457                                         if ($fieldname == "target_type")
 458                                                 $fieldname = "parent_type";
 459                                 }
 460
 461                                 if ($fieldname == "sender_handle")
 462                                         $fieldname = "author";
 463
 464                                 if ($fieldname == "recipient_handle")
 465                                         $fieldname = "recipient";
 466
 467                                 if ($fieldname == "root_diaspora_id")
 468                                         $fieldname = "root_author";
 469
 470                                 if ($type == "retraction") {
 471                                         if ($fieldname == "post_guid")
 472                                                 $fieldname = "target_guid";
 473
 474                                         if ($fieldname == "type")
 475                                                 $fieldname = "target_type";
 476                                 }
 477                         }
 478
 479                         if (($fieldname == "author_signature") AND ($entry != ""))
 480                                 $author_signature = base64_decode($entry);
 481                         elseif (($fieldname == "parent_author_signature") AND ($entry != ""))
 482                                 $parent_author_signature = base64_decode($entry);
 483                         elseif (!in_array($fieldname, array("author_signature", "parent_author_signature", "target_author_signature"))) {
 484                                 if ($signed_data != "") {
 485                                         $signed_data .= ";";
 486                                         $signed_data_parent .= ";";
 487                                 }
 488
 489                                 $signed_data .= $entry;
 490                         }
 491                         if (!in_array($fieldname, array("parent_author_signature", "target_author_signature")) OR
 492                                 ($orig_type == "relayable_retraction"))
 493                                 xml::copy($entry, $fields, $fieldname);
 494                 }
 495
 496                 // This is something that shouldn't happen at all.
 497                 if (in_array($type, array("status_message", "reshare", "profile")))
 498                         if ($msg["author"] != $fields->author) {
 499                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 500                                 return false;
 501                         }
 502
 503                 // Only some message types have signatures. So we quit here for the other types.
 504                 if (!in_array($type, array("comment", "message", "like")))
 505                         return true;
 506
 507                 // No author_signature? This is a must, so we quit.
 508                 if (!isset($author_signature)) {
 509                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 510                         return false;
 511                 }
 512
 513                 if (isset($parent_author_signature)) {
 514                         $key = self::key($msg["author"]);
 515
 516                         if (!rsa_verify($signed_data, $parent_author_signature, $key, "sha256")) {
 517                                 logger("No valid parent author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 518                                 return false;
 519                         }
 520                 }
 521
 522                 $key = self::key($fields->author);
 523
 524                 if (!rsa_verify($signed_data, $author_signature, $key, "sha256")) {
 525                         logger("No valid author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 526                         return false;
 527                 } else
 528                         return true;
 529         }
 530
 531         /**
 532          * @brief Fetches the public key for a given handle
 533          *
 534          * @param string $handle The handle
 535          *
 536          * @return string The public key
 537          */
 538         private function key($handle) {
 539                 $handle = strval($handle);
 540
 541                 logger("Fetching diaspora key for: ".$handle);
 542
 543                 $r = self::person_by_handle($handle);
 544                 if($r)
 545                         return $r["pubkey"];
 546
 547                 return "";
 548         }
 549
 550         /**
 551          * @brief Fetches data for a given handle
 552          *
 553          * @param string $handle The handle
 554          *
 555          * @return array the queried data
 556          */
 557         private function person_by_handle($handle) {
 558
 559                 $r = q("SELECT * FROM `fcontact` WHERE `network` = '%s' AND `addr` = '%s' LIMIT 1",
 560                         dbesc(NETWORK_DIASPORA),
 561                         dbesc($handle)
 562                 );
 563                 if ($r) {
 564                         $person = $r[0];
 565                         logger("In cache ".print_r($r,true), LOGGER_DEBUG);
 566
 567                         // update record occasionally so it doesn't get stale
 568                         $d = strtotime($person["updated"]." +00:00");
 569                         if ($d < strtotime("now - 14 days"))
 570                                 $update = true;
 571                 }
 572
 573                 if (!$person OR $update) {
 574                         logger("create or refresh", LOGGER_DEBUG);
 575                         $r = probe_url($handle, PROBE_DIASPORA);
 576
 577                         // Note that Friendica contacts will return a "Diaspora person"
 578                         // if Diaspora connectivity is enabled on their server
 579                         if ($r AND ($r["network"] === NETWORK_DIASPORA)) {
 580                                 self::add_fcontact($r, $update);
 581                                 $person = $r;
 582                         }
 583                 }
 584                 return $person;
 585         }
 586
 587         /**
 588          * @brief Updates the fcontact table
 589          *
 590          * @param array $arr The fcontact data
 591          * @param bool $update Update or insert?
 592          *
 593          * @return string The id of the fcontact entry
 594          */
 595         private function add_fcontact($arr, $update = false) {
 596
 597                 if($update) {
 598                         $r = q("UPDATE `fcontact` SET
 599                                         `name` = '%s',
 600                                         `photo` = '%s',
 601                                         `request` = '%s',
 602                                         `nick` = '%s',
 603                                         `addr` = '%s',
 604                                         `batch` = '%s',
 605                                         `notify` = '%s',
 606                                         `poll` = '%s',
 607                                         `confirm` = '%s',
 608                                         `alias` = '%s',
 609                                         `pubkey` = '%s',
 610                                         `updated` = '%s'
 611                                 WHERE `url` = '%s' AND `network` = '%s'",
 612                                         dbesc($arr["name"]),
 613                                         dbesc($arr["photo"]),
 614                                         dbesc($arr["request"]),
 615                                         dbesc($arr["nick"]),
 616                                         dbesc($arr["addr"]),
 617                                         dbesc($arr["batch"]),
 618                                         dbesc($arr["notify"]),
 619                                         dbesc($arr["poll"]),
 620                                         dbesc($arr["confirm"]),
 621                                         dbesc($arr["alias"]),
 622                                         dbesc($arr["pubkey"]),
 623                                         dbesc(datetime_convert()),
 624                                         dbesc($arr["url"]),
 625                                         dbesc($arr["network"])
 626                                 );
 627                 } else {
 628                         $r = q("INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`,
 629                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 630                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 631                                         dbesc($arr["url"]),
 632                                         dbesc($arr["name"]),
 633                                         dbesc($arr["photo"]),
 634                                         dbesc($arr["request"]),
 635                                         dbesc($arr["nick"]),
 636                                         dbesc($arr["addr"]),
 637                                         dbesc($arr["batch"]),
 638                                         dbesc($arr["notify"]),
 639                                         dbesc($arr["poll"]),
 640                                         dbesc($arr["confirm"]),
 641                                         dbesc($arr["network"]),
 642                                         dbesc($arr["alias"]),
 643                                         dbesc($arr["pubkey"]),
 644                                         dbesc(datetime_convert())
 645                                 );
 646                 }
 647
 648                 return $r;
 649         }
 650
 651         /**
 652          * @brief get a handle (user@domain.tld) from a given contact id or gcontact id
 653          *
 654          * @param int $contact_id The id in the contact table
 655          * @param int $gcontact_id The id in the gcontact table
 656          *
 657          * @return string the handle
 658          */
 659         public static function handle_from_contact($contact_id, $gcontact_id = 0) {
 660                 $handle = False;
 661
 662                 logger("contact id is ".$contact_id." - gcontact id is ".$gcontact_id, LOGGER_DEBUG);
 663
 664                 if ($gcontact_id != 0) {
 665                         $r = q("SELECT `addr` FROM `gcontact` WHERE `id` = %d AND `addr` != ''",
 666                                 intval($gcontact_id));
 667                         if ($r)
 668                                 return $r[0]["addr"];
 669                 }
 670
 671                 $r = q("SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 672                         intval($contact_id));
 673                 if ($r) {
 674                         $contact = $r[0];
 675
 676                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 677
 678                         if($contact['addr'] != "")
 679                                 $handle = $contact['addr'];
 680                         else {
 681                                 $baseurl_start = strpos($contact['url'],'://') + 3;
 682                                 $baseurl_length = strpos($contact['url'],'/profile') - $baseurl_start; // allows installations in a subdirectory--not sure how Diaspora will handle
 683                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 684                                 $handle = $contact['nick'].'@'.$baseurl;
 685                         }
 686                 }
 687
 688                 return $handle;
 689         }
 690
 691         /**
 692          * @brief Get a contact id for a given handle
 693          *
 694          * @param int $uid The user id
 695          * @param string $handle The handle in the format user@domain.tld
 696          *
 697          * @return The contact id
 698          */
 699         private function contact_by_handle($uid, $handle) {
 700                 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
 701                         intval($uid),
 702                         dbesc($handle)
 703                 );
 704
 705                 if ($r)
 706                         return $r[0];
 707
 708                 $handle_parts = explode("@", $handle);
 709                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
 710                 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
 711                         dbesc(NETWORK_DFRN),
 712                         intval($uid),
 713                         dbesc($nurl_sql)
 714                 );
 715                 if($r)
 716                         return $r[0];
 717
 718                 return false;
 719         }
 720
 721         /**
 722          * @brief Check if posting is allowed for this contact
 723          *
 724          * @param array $importer Array of the importer user
 725          * @param array $contact The contact that is checked
 726          * @param bool $is_comment Is the check for a comment?
 727          *
 728          * @return bool is the contact allowed to post?
 729          */
 730         private function post_allow($importer, $contact, $is_comment = false) {
 731
 732                 // perhaps we were already sharing with this person. Now they're sharing with us.
 733                 // That makes us friends.
 734                 // Normally this should have handled by getting a request - but this could get lost
 735                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
 736                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
 737                                 intval(CONTACT_IS_FRIEND),
 738                                 intval($contact["id"]),
 739                                 intval($importer["uid"])
 740                         );
 741                         $contact["rel"] = CONTACT_IS_FRIEND;
 742                         logger("defining user ".$contact["nick"]." as friend");
 743                 }
 744
 745                 if(($contact["blocked"]) || ($contact["readonly"]) || ($contact["archive"]))
 746                         return false;
 747                 if($contact["rel"] == CONTACT_IS_SHARING || $contact["rel"] == CONTACT_IS_FRIEND)
 748                         return true;
 749                 if($contact["rel"] == CONTACT_IS_FOLLOWER)
 750                         if(($importer["page-flags"] == PAGE_COMMUNITY) OR $is_comment)
 751                                 return true;
 752
 753                 // Messages for the global users are always accepted
 754                 if ($importer["uid"] == 0)
 755                         return true;
 756
 757                 return false;
 758         }
 759
 760         /**
 761          * @brief Fetches the contact id for a handle and checks if posting is allowed
 762          *
 763          * @param array $importer Array of the importer user
 764          * @param string $handle The checked handle in the format user@domain.tld
 765          * @param bool $is_comment Is the check for a comment?
 766          *
 767          * @return array The contact data
 768          */
 769         private function allowed_contact_by_handle($importer, $handle, $is_comment = false) {
 770                 $contact = self::contact_by_handle($importer["uid"], $handle);
 771                 if (!$contact) {
 772                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
 773                         return false;
 774                 }
 775
 776                 if (!self::post_allow($importer, $contact, $is_comment)) {
 777                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
 778                         return false;
 779                 }
 780                 return $contact;
 781         }
 782
 783         /**
 784          * @brief Does the message already exists on the system?
 785          *
 786          * @param int $uid The user id
 787          * @param string $guid The guid of the message
 788          *
 789          * @return int|bool message id if the message already was stored into the system - or false.
 790          */
 791         private function message_exists($uid, $guid) {
 792                 $r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 793                         intval($uid),
 794                         dbesc($guid)
 795                 );
 796
 797                 if($r) {
 798                         logger("message ".$guid." already exists for user ".$uid);
 799                         return $r[0]["id"];
 800                 }
 801
 802                 return false;
 803         }
 804
 805         /**
 806          * @brief Checks for links to posts in a message
 807          *
 808          * @param array $item The item array
 809          */
 810         private function fetch_guid($item) {
 811                 preg_replace_callback("&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
 812                         function ($match) use ($item){
 813                                 return(self::fetch_guid_sub($match, $item));
 814                         },$item["body"]);
 815         }
 816
 817         /**
 818          * @brief sub function of "fetch_guid" which checks for links in messages
 819          *
 820          * @param array $match array containing a link that has to be checked for a message link
 821          * @param array $item The item array
 822          */
 823         private function fetch_guid_sub($match, $item) {
 824                 if (!self::store_by_guid($match[1], $item["author-link"]))
 825                         self::store_by_guid($match[1], $item["owner-link"]);
 826         }
 827
 828         /**
 829          * @brief Fetches an item with a given guid from a given server
 830          *
 831          * @param string $guid the message guid
 832          * @param string $server The server address
 833          * @param int $uid The user id of the user
 834          *
 835          * @return int the message id of the stored message or false
 836          */
 837         private function store_by_guid($guid, $server, $uid = 0) {
 838                 $serverparts = parse_url($server);
 839                 $server = $serverparts["scheme"]."://".$serverparts["host"];
 840
 841                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
 842
 843                 $msg = self::message($guid, $server);
 844
 845                 if (!$msg)
 846                         return false;
 847
 848                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
 849
 850                 // Now call the dispatcher
 851                 return self::dispatch_public($msg);
 852         }
 853
 854         /**
 855          * @brief Fetches a message from a server
 856          *
 857          * @param string $guid message guid
 858          * @param string $server The url of the server
 859          * @param int $level Endless loop prevention
 860          *
 861          * @return array
 862          *      'message' => The message XML
 863          *      'author' => The author handle
 864          *      'key' => The public key of the author
 865          */
 866         private function message($guid, $server, $level = 0) {
 867
 868                 if ($level > 5)
 869                         return false;
 870
 871                 // This will work for new Diaspora servers and Friendica servers from 3.5
 872                 $source_url = $server."/fetch/post/".$guid;
 873                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
 874
 875                 $envelope = fetch_url($source_url);
 876                 if($envelope) {
 877                         logger("Envelope was fetched.", LOGGER_DEBUG);
 878                         $x = self::verify_magic_envelope($envelope);
 879                         if (!$x)
 880                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
 881                         else
 882                                 logger("Envelope was verified.", LOGGER_DEBUG);
 883                 } else
 884                         $x = false;
 885
 886                 // This will work for older Diaspora and Friendica servers
 887                 if (!$x) {
 888                         $source_url = $server."/p/".$guid.".xml";
 889                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
 890
 891                         $x = fetch_url($source_url);
 892                         if(!$x)
 893                                 return false;
 894                 }
 895
 896                 $source_xml = parse_xml_string($x, false);
 897
 898                 if (!is_object($source_xml))
 899                         return false;
 900
 901                 if ($source_xml->post->reshare) {
 902                         // Reshare of a reshare - old Diaspora version
 903                         logger("Message is a reshare", LOGGER_DEBUG);
 904                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
 905                 } elseif ($source_xml->getName() == "reshare") {
 906                         // Reshare of a reshare - new Diaspora version
 907                         logger("Message is a new reshare", LOGGER_DEBUG);
 908                         return self::message($source_xml->root_guid, $server, ++$level);
 909                 }
 910
 911                 $author = "";
 912
 913                 // Fetch the author - for the old and the new Diaspora version
 914                 if ($source_xml->post->status_message->diaspora_handle)
 915                         $author = (string)$source_xml->post->status_message->diaspora_handle;
 916                 elseif ($source_xml->author AND ($source_xml->getName() == "status_message"))
 917                         $author = (string)$source_xml->author;
 918
 919                 // If this isn't a "status_message" then quit
 920                 if (!$author) {
 921                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
 922                         return false;
 923                 }
 924
 925                 $msg = array("message" => $x, "author" => $author);
 926
 927                 $msg["key"] = self::key($msg["author"]);
 928
 929                 return $msg;
 930         }
 931
 932         /**
 933          * @brief Fetches the item record of a given guid
 934          *
 935          * @param int $uid The user id
 936          * @param string $guid message guid
 937          * @param string $author The handle of the item
 938          * @param array $contact The contact of the item owner
 939          *
 940          * @return array the item record
 941          */
 942         private function parent_item($uid, $guid, $author, $contact) {
 943                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 944                                 `author-name`, `author-link`, `author-avatar`,
 945                                 `owner-name`, `owner-link`, `owner-avatar`
 946                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 947                         intval($uid), dbesc($guid));
 948
 949                 if(!$r) {
 950                         $result = self::store_by_guid($guid, $contact["url"], $uid);
 951
 952                         if (!$result) {
 953                                 $person = self::person_by_handle($author);
 954                                 $result = self::store_by_guid($guid, $person["url"], $uid);
 955                         }
 956
 957                         if ($result) {
 958                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
 959
 960                                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 961                                                 `author-name`, `author-link`, `author-avatar`,
 962                                                 `owner-name`, `owner-link`, `owner-avatar`
 963                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 964                                         intval($uid), dbesc($guid));
 965                         }
 966                 }
 967
 968                 if (!$r) {
 969                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
 970                         return false;
 971                 } else {
 972                         logger("parent item found: parent: ".$guid." - user: ".$uid);
 973                         return $r[0];
 974                 }
 975         }
 976
 977         /**
 978          * @brief returns contact details
 979          *
 980          * @param array $contact The default contact if the person isn't found
 981          * @param array $person The record of the person
 982          * @param int $uid The user id
 983          *
 984          * @return array
 985          *      'cid' => contact id
 986          *      'network' => network type
 987          */
 988         private function author_contact_by_url($contact, $person, $uid) {
 989
 990                 $r = q("SELECT `id`, `network` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
 991                         dbesc(normalise_link($person["url"])), intval($uid));
 992                 if ($r) {
 993                         $cid = $r[0]["id"];
 994                         $network = $r[0]["network"];
 995                 } else {
 996                         $cid = $contact["id"];
 997                         $network = NETWORK_DIASPORA;
 998                 }
 999
1000                 return (array("cid" => $cid, "network" => $network));
1001         }
1002
1003         /**
1004          * @brief Is the profile a hubzilla profile?
1005          *
1006          * @param string $url The profile link
1007          *
1008          * @return bool is it a hubzilla server?
1009          */
1010         public static function is_redmatrix($url) {
1011                 return(strstr($url, "/channel/"));
1012         }
1013
1014         /**
1015          * @brief Generate a post link with a given handle and message guid
1016          *
1017          * @param string $addr The user handle
1018          * @param string $guid message guid
1019          *
1020          * @return string the post link
1021          */
1022         private function plink($addr, $guid) {
1023                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
1024
1025                 // Fallback
1026                 if (!$r)
1027                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1028
1029                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
1030                 // So we try another way as well.
1031                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
1032                 if ($s)
1033                         $r[0]["network"] = $s[0]["network"];
1034
1035                 if ($r[0]["network"] == NETWORK_DFRN)
1036                         return(str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/"));
1037
1038                 if (self::is_redmatrix($r[0]["url"]))
1039                         return $r[0]["url"]."/?f=&mid=".$guid;
1040
1041                 return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1042         }
1043
1044         /**
1045          * @brief Processes an account deletion
1046          *
1047          * @param array $importer Array of the importer user
1048          * @param object $data The message object
1049          *
1050          * @return bool Success
1051          */
1052         private function receive_account_deletion($importer, $data) {
1053
1054                 /// @todo Account deletion should remove the contact from the global contacts as well
1055
1056                 $author = notags(unxmlify($data->author));
1057
1058                 $contact = self::contact_by_handle($importer["uid"], $author);
1059                 if (!$contact) {
1060                         logger("cannot find contact for author: ".$author);
1061                         return false;
1062                 }
1063
1064                 // We now remove the contact
1065                 contact_remove($contact["id"]);
1066                 return true;
1067         }
1068
1069         /**
1070          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1071          *
1072          * @param string $author Author handle
1073          * @param string $guid Message guid
1074          *
1075          * @return string The constructed uri or the one from our database
1076          */
1077         private function get_uri_from_guid($author, $guid) {
1078
1079                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1080                 if ($r)
1081                         return $r[0]["uri"];
1082                 else
1083                         return $author.":".$guid;
1084         }
1085
1086         /**
1087          * @brief Processes an incoming comment
1088          *
1089          * @param array $importer Array of the importer user
1090          * @param string $sender The sender of the message
1091          * @param object $data The message object
1092          * @param string $xml The original XML of the message
1093          *
1094          * @return int The message id of the generated comment or "false" if there was an error
1095          */
1096         private function receive_comment($importer, $sender, $data, $xml) {
1097                 $guid = notags(unxmlify($data->guid));
1098                 $parent_guid = notags(unxmlify($data->parent_guid));
1099                 $text = unxmlify($data->text);
1100                 $author = notags(unxmlify($data->author));
1101
1102                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1103                 if (!$contact)
1104                         return false;
1105
1106                 $message_id = self::message_exists($importer["uid"], $guid);
1107                 if ($message_id)
1108                         return $message_id;
1109
1110                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1111                 if (!$parent_item)
1112                         return false;
1113
1114                 $person = self::person_by_handle($author);
1115                 if (!is_array($person)) {
1116                         logger("unable to find author details");
1117                         return false;
1118                 }
1119
1120                 // Fetch the contact id - if we know this contact
1121                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1122
1123                 $datarray = array();
1124
1125                 $datarray["uid"] = $importer["uid"];
1126                 $datarray["contact-id"] = $author_contact["cid"];
1127                 $datarray["network"]  = $author_contact["network"];
1128
1129                 $datarray["author-name"] = $person["name"];
1130                 $datarray["author-link"] = $person["url"];
1131                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1132
1133                 $datarray["owner-name"] = $contact["name"];
1134                 $datarray["owner-link"] = $contact["url"];
1135                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1136
1137                 $datarray["guid"] = $guid;
1138                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1139
1140                 $datarray["type"] = "remote-comment";
1141                 $datarray["verb"] = ACTIVITY_POST;
1142                 $datarray["gravity"] = GRAVITY_COMMENT;
1143                 $datarray["parent-uri"] = $parent_item["uri"];
1144
1145                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1146                 $datarray["object"] = $xml;
1147
1148                 $datarray["body"] = diaspora2bb($text);
1149
1150                 self::fetch_guid($datarray);
1151
1152                 $message_id = item_store($datarray);
1153
1154                 if ($message_id)
1155                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1156
1157                 // If we are the origin of the parent we store the original data and notify our followers
1158                 if($message_id AND $parent_item["origin"]) {
1159
1160                         // Formerly we stored the signed text, the signature and the author in different fields.
1161                         // We now store the raw data so that we are more flexible.
1162                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1163                                 intval($message_id),
1164                                 dbesc(json_encode($data))
1165                         );
1166
1167                         // notify others
1168                         proc_run("php", "include/notifier.php", "comment-import", $message_id);
1169                 }
1170
1171                 return $message_id;
1172         }
1173
1174         /**
1175          * @brief processes and stores private messages
1176          *
1177          * @param array $importer Array of the importer user
1178          * @param array $contact The contact of the message
1179          * @param object $data The message object
1180          * @param array $msg Array of the processed message, author handle and key
1181          * @param object $mesg The private message
1182          * @param array $conversation The conversation record to which this message belongs
1183          *
1184          * @return bool "true" if it was successful
1185          */
1186         private function receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation) {
1187                 $guid = notags(unxmlify($data->guid));
1188                 $subject = notags(unxmlify($data->subject));
1189                 $author = notags(unxmlify($data->author));
1190
1191                 $reply = 0;
1192
1193                 $msg_guid = notags(unxmlify($mesg->guid));
1194                 $msg_parent_guid = notags(unxmlify($mesg->parent_guid));
1195                 $msg_parent_author_signature = notags(unxmlify($mesg->parent_author_signature));
1196                 $msg_author_signature = notags(unxmlify($mesg->author_signature));
1197                 $msg_text = unxmlify($mesg->text);
1198                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1199
1200                 // "diaspora_handle" is the element name from the old version
1201                 // "author" is the element name from the new version
1202                 if ($mesg->author)
1203                         $msg_author = notags(unxmlify($mesg->author));
1204                 elseif ($mesg->diaspora_handle)
1205                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1206                 else
1207                         return false;
1208
1209                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1210
1211                 if($msg_conversation_guid != $guid) {
1212                         logger("message conversation guid does not belong to the current conversation.");
1213                         return false;
1214                 }
1215
1216                 $body = diaspora2bb($msg_text);
1217                 $message_uri = $msg_author.":".$msg_guid;
1218
1219                 $author_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1220
1221                 $author_signature = base64_decode($msg_author_signature);
1222
1223                 if(strcasecmp($msg_author,$msg["author"]) == 0) {
1224                         $person = $contact;
1225                         $key = $msg["key"];
1226                 } else {
1227                         $person = self::person_by_handle($msg_author);
1228
1229                         if (is_array($person) && x($person, "pubkey"))
1230                                 $key = $person["pubkey"];
1231                         else {
1232                                 logger("unable to find author details");
1233                                         return false;
1234                         }
1235                 }
1236
1237                 if (!rsa_verify($author_signed_data, $author_signature, $key, "sha256")) {
1238                         logger("verification failed.");
1239                         return false;
1240                 }
1241
1242                 if($msg_parent_author_signature) {
1243                         $owner_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1244
1245                         $parent_author_signature = base64_decode($msg_parent_author_signature);
1246
1247                         $key = $msg["key"];
1248
1249                         if (!rsa_verify($owner_signed_data, $parent_author_signature, $key, "sha256")) {
1250                                 logger("owner verification failed.");
1251                                 return false;
1252                         }
1253                 }
1254
1255                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' LIMIT 1",
1256                         dbesc($message_uri)
1257                 );
1258                 if($r) {
1259                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1260                         return false;
1261                 }
1262
1263                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1264                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1265                         intval($importer["uid"]),
1266                         dbesc($msg_guid),
1267                         intval($conversation["id"]),
1268                         dbesc($person["name"]),
1269                         dbesc($person["photo"]),
1270                         dbesc($person["url"]),
1271                         intval($contact["id"]),
1272                         dbesc($subject),
1273                         dbesc($body),
1274                         0,
1275                         0,
1276                         dbesc($message_uri),
1277                         dbesc($author.":".$guid),
1278                         dbesc($msg_created_at)
1279                 );
1280
1281                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1282                         dbesc(datetime_convert()),
1283                         intval($conversation["id"])
1284                 );
1285
1286                 notification(array(
1287                         "type" => NOTIFY_MAIL,
1288                         "notify_flags" => $importer["notify-flags"],
1289                         "language" => $importer["language"],
1290                         "to_name" => $importer["username"],
1291                         "to_email" => $importer["email"],
1292                         "uid" =>$importer["uid"],
1293                         "item" => array("subject" => $subject, "body" => $body),
1294                         "source_name" => $person["name"],
1295                         "source_link" => $person["url"],
1296                         "source_photo" => $person["thumb"],
1297                         "verb" => ACTIVITY_POST,
1298                         "otype" => "mail"
1299                 ));
1300                 return true;
1301         }
1302
1303         /**
1304          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1305          *
1306          * @param array $importer Array of the importer user
1307          * @param array $msg Array of the processed message, author handle and key
1308          * @param object $data The message object
1309          *
1310          * @return bool Success
1311          */
1312         private function receive_conversation($importer, $msg, $data) {
1313                 $guid = notags(unxmlify($data->guid));
1314                 $subject = notags(unxmlify($data->subject));
1315                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1316                 $author = notags(unxmlify($data->author));
1317                 $participants = notags(unxmlify($data->participants));
1318
1319                 $messages = $data->message;
1320
1321                 if (!count($messages)) {
1322                         logger("empty conversation");
1323                         return false;
1324                 }
1325
1326                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1327                 if (!$contact)
1328                         return false;
1329
1330                 $conversation = null;
1331
1332                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1333                         intval($importer["uid"]),
1334                         dbesc($guid)
1335                 );
1336                 if($c)
1337                         $conversation = $c[0];
1338                 else {
1339                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1340                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1341                                 intval($importer["uid"]),
1342                                 dbesc($guid),
1343                                 dbesc($author),
1344                                 dbesc(datetime_convert("UTC", "UTC", $created_at)),
1345                                 dbesc(datetime_convert()),
1346                                 dbesc($subject),
1347                                 dbesc($participants)
1348                         );
1349                         if($r)
1350                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1351                                         intval($importer["uid"]),
1352                                         dbesc($guid)
1353                                 );
1354
1355                         if($c)
1356                                 $conversation = $c[0];
1357                 }
1358                 if (!$conversation) {
1359                         logger("unable to create conversation.");
1360                         return;
1361                 }
1362
1363                 foreach($messages as $mesg)
1364                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation);
1365
1366                 return true;
1367         }
1368
1369         /**
1370          * @brief Creates the body for a "like" message
1371          *
1372          * @param array $contact The contact that send us the "like"
1373          * @param array $parent_item The item array of the parent item
1374          * @param string $guid message guid
1375          *
1376          * @return string the body
1377          */
1378         private function construct_like_body($contact, $parent_item, $guid) {
1379                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1380
1381                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1382                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1383                 $plink = "[url=".App::get_baseurl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1384
1385                 return sprintf($bodyverb, $ulink, $alink, $plink);
1386         }
1387
1388         /**
1389          * @brief Creates a XML object for a "like"
1390          *
1391          * @param array $importer Array of the importer user
1392          * @param array $parent_item The item array of the parent item
1393          *
1394          * @return string The XML
1395          */
1396         private function construct_like_object($importer, $parent_item) {
1397                 $objtype = ACTIVITY_OBJ_NOTE;
1398                 $link = '<link rel="alternate" type="text/html" href="'.App::get_baseurl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1399                 $parent_body = $parent_item["body"];
1400
1401                 $xmldata = array("object" => array("type" => $objtype,
1402                                                 "local" => "1",
1403                                                 "id" => $parent_item["uri"],
1404                                                 "link" => $link,
1405                                                 "title" => "",
1406                                                 "content" => $parent_body));
1407
1408                 return xml::from_array($xmldata, $xml, true);
1409         }
1410
1411         /**
1412          * @brief Processes "like" messages
1413          *
1414          * @param array $importer Array of the importer user
1415          * @param string $sender The sender of the message
1416          * @param object $data The message object
1417          *
1418          * @return int The message id of the generated like or "false" if there was an error
1419          */
1420         private function receive_like($importer, $sender, $data) {
1421                 $positive = notags(unxmlify($data->positive));
1422                 $guid = notags(unxmlify($data->guid));
1423                 $parent_type = notags(unxmlify($data->parent_type));
1424                 $parent_guid = notags(unxmlify($data->parent_guid));
1425                 $author = notags(unxmlify($data->author));
1426
1427                 // likes on comments aren't supported by Diaspora - only on posts
1428                 // But maybe this will be supported in the future, so we will accept it.
1429                 if (!in_array($parent_type, array("Post", "Comment")))
1430                         return false;
1431
1432                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1433                 if (!$contact)
1434                         return false;
1435
1436                 $message_id = self::message_exists($importer["uid"], $guid);
1437                 if ($message_id)
1438                         return $message_id;
1439
1440                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1441                 if (!$parent_item)
1442                         return false;
1443
1444                 $person = self::person_by_handle($author);
1445                 if (!is_array($person)) {
1446                         logger("unable to find author details");
1447                         return false;
1448                 }
1449
1450                 // Fetch the contact id - if we know this contact
1451                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1452
1453                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1454                 // We would accept this anyhow.
1455                 if ($positive == "true")
1456                         $verb = ACTIVITY_LIKE;
1457                 else
1458                         $verb = ACTIVITY_DISLIKE;
1459
1460                 $datarray = array();
1461
1462                 $datarray["uid"] = $importer["uid"];
1463                 $datarray["contact-id"] = $author_contact["cid"];
1464                 $datarray["network"]  = $author_contact["network"];
1465
1466                 $datarray["author-name"] = $person["name"];
1467                 $datarray["author-link"] = $person["url"];
1468                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1469
1470                 $datarray["owner-name"] = $contact["name"];
1471                 $datarray["owner-link"] = $contact["url"];
1472                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1473
1474                 $datarray["guid"] = $guid;
1475                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1476
1477                 $datarray["type"] = "activity";
1478                 $datarray["verb"] = $verb;
1479                 $datarray["gravity"] = GRAVITY_LIKE;
1480                 $datarray["parent-uri"] = $parent_item["uri"];
1481
1482                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1483                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1484
1485                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1486
1487                 $message_id = item_store($datarray);
1488
1489                 if ($message_id)
1490                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1491
1492                 // If we are the origin of the parent we store the original data and notify our followers
1493                 if($message_id AND $parent_item["origin"]) {
1494
1495                         // Formerly we stored the signed text, the signature and the author in different fields.
1496                         // We now store the raw data so that we are more flexible.
1497                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1498                                 intval($message_id),
1499                                 dbesc(json_encode($data))
1500                         );
1501
1502                         // notify others
1503                         proc_run("php", "include/notifier.php", "comment-import", $message_id);
1504                 }
1505
1506                 return $message_id;
1507         }
1508
1509         /**
1510          * @brief Processes private messages
1511          *
1512          * @param array $importer Array of the importer user
1513          * @param object $data The message object
1514          *
1515          * @return bool Success?
1516          */
1517         private function receive_message($importer, $data) {
1518                 $guid = notags(unxmlify($data->guid));
1519                 $parent_guid = notags(unxmlify($data->parent_guid));
1520                 $text = unxmlify($data->text);
1521                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1522                 $author = notags(unxmlify($data->author));
1523                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1524
1525                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1526                 if (!$contact)
1527                         return false;
1528
1529                 $conversation = null;
1530
1531                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1532                         intval($importer["uid"]),
1533                         dbesc($conversation_guid)
1534                 );
1535                 if($c)
1536                         $conversation = $c[0];
1537                 else {
1538                         logger("conversation not available.");
1539                         return false;
1540                 }
1541
1542                 $reply = 0;
1543
1544                 $body = diaspora2bb($text);
1545                 $message_uri = $author.":".$guid;
1546
1547                 $person = self::person_by_handle($author);
1548                 if (!$person) {
1549                         logger("unable to find author details");
1550                         return false;
1551                 }
1552
1553                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
1554                         dbesc($message_uri),
1555                         intval($importer["uid"])
1556                 );
1557                 if($r) {
1558                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1559                         return false;
1560                 }
1561
1562                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1563                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1564                         intval($importer["uid"]),
1565                         dbesc($guid),
1566                         intval($conversation["id"]),
1567                         dbesc($person["name"]),
1568                         dbesc($person["photo"]),
1569                         dbesc($person["url"]),
1570                         intval($contact["id"]),
1571                         dbesc($conversation["subject"]),
1572                         dbesc($body),
1573                         0,
1574                         1,
1575                         dbesc($message_uri),
1576                         dbesc($author.":".$parent_guid),
1577                         dbesc($created_at)
1578                 );
1579
1580                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1581                         dbesc(datetime_convert()),
1582                         intval($conversation["id"])
1583                 );
1584
1585                 return true;
1586         }
1587
1588         /**
1589          * @brief Processes participations - unsupported by now
1590          *
1591          * @param array $importer Array of the importer user
1592          * @param object $data The message object
1593          *
1594          * @return bool always true
1595          */
1596         private function receive_participation($importer, $data) {
1597                 // I'm not sure if we can fully support this message type
1598                 return true;
1599         }
1600
1601         /**
1602          * @brief Processes photos - unneeded
1603          *
1604          * @param array $importer Array of the importer user
1605          * @param object $data The message object
1606          *
1607          * @return bool always true
1608          */
1609         private function receive_photo($importer, $data) {
1610                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
1611                 return true;
1612         }
1613
1614         /**
1615          * @brief Processes poll participations - unssupported
1616          *
1617          * @param array $importer Array of the importer user
1618          * @param object $data The message object
1619          *
1620          * @return bool always true
1621          */
1622         private function receive_poll_participation($importer, $data) {
1623                 // We don't support polls by now
1624                 return true;
1625         }
1626
1627         /**
1628          * @brief Processes incoming profile updates
1629          *
1630          * @param array $importer Array of the importer user
1631          * @param object $data The message object
1632          *
1633          * @return bool Success
1634          */
1635         private function receive_profile($importer, $data) {
1636                 $author = notags(unxmlify($data->author));
1637
1638                 $contact = self::contact_by_handle($importer["uid"], $author);
1639                 if (!$contact)
1640                         return false;
1641
1642                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
1643                 $image_url = unxmlify($data->image_url);
1644                 $birthday = unxmlify($data->birthday);
1645                 $location = diaspora2bb(unxmlify($data->location));
1646                 $about = diaspora2bb(unxmlify($data->bio));
1647                 $gender = unxmlify($data->gender);
1648                 $searchable = (unxmlify($data->searchable) == "true");
1649                 $nsfw = (unxmlify($data->nsfw) == "true");
1650                 $tags = unxmlify($data->tag_string);
1651
1652                 $tags = explode("#", $tags);
1653
1654                 $keywords = array();
1655                 foreach ($tags as $tag) {
1656                         $tag = trim(strtolower($tag));
1657                         if ($tag != "")
1658                                 $keywords[] = $tag;
1659                 }
1660
1661                 $keywords = implode(", ", $keywords);
1662
1663                 $handle_parts = explode("@", $author);
1664                 $nick = $handle_parts[0];
1665
1666                 if($name === "")
1667                         $name = $handle_parts[0];
1668
1669                 if( preg_match("|^https?://|", $image_url) === 0)
1670                         $image_url = "http://".$handle_parts[1].$image_url;
1671
1672                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
1673
1674                 // Generic birthday. We don't know the timezone. The year is irrelevant.
1675
1676                 $birthday = str_replace("1000", "1901", $birthday);
1677
1678                 if ($birthday != "")
1679                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
1680
1681                 // this is to prevent multiple birthday notifications in a single year
1682                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
1683
1684                 if(substr($birthday,5) === substr($contact["bd"],5))
1685                         $birthday = $contact["bd"];
1686
1687                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
1688                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
1689                         dbesc($name),
1690                         dbesc($nick),
1691                         dbesc($author),
1692                         dbesc(datetime_convert()),
1693                         dbesc($birthday),
1694                         dbesc($location),
1695                         dbesc($about),
1696                         dbesc($keywords),
1697                         dbesc($gender),
1698                         intval($contact["id"]),
1699                         intval($importer["uid"])
1700                 );
1701
1702                 if ($searchable) {
1703                         poco_check($contact["url"], $name, NETWORK_DIASPORA, $image_url, $about, $location, $gender, $keywords, "",
1704                                 datetime_convert(), 2, $contact["id"], $importer["uid"]);
1705                 }
1706
1707                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
1708                                         "photo" => $image_url, "name" => $name, "location" => $location,
1709                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
1710                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
1711                                         "hide" => !$searchable, "nsfw" => $nsfw);
1712
1713                 update_gcontact($gcontact);
1714
1715                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
1716
1717                 return true;
1718         }
1719
1720         /**
1721          * @brief Processes incoming friend requests
1722          *
1723          * @param array $importer Array of the importer user
1724          * @param array $contact The contact that send the request
1725          */
1726         private function receive_request_make_friend($importer, $contact) {
1727
1728                 $a = get_app();
1729
1730                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1731                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
1732                                 intval(CONTACT_IS_FRIEND),
1733                                 intval($contact["id"]),
1734                                 intval($importer["uid"])
1735                         );
1736                 }
1737                 // send notification
1738
1739                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
1740                         intval($importer["uid"])
1741                 );
1742
1743                 if($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(get_pconfig($importer["uid"], "system", "post_newfriend"))) {
1744
1745                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
1746                                 intval($importer["uid"])
1747                         );
1748
1749                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
1750
1751                         if($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
1752
1753                                 $arr = array();
1754                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
1755                                 $arr["uid"] = $importer["uid"];
1756                                 $arr["contact-id"] = $self[0]["id"];
1757                                 $arr["wall"] = 1;
1758                                 $arr["type"] = 'wall';
1759                                 $arr["gravity"] = 0;
1760                                 $arr["origin"] = 1;
1761                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
1762                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
1763                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
1764                                 $arr["verb"] = ACTIVITY_FRIEND;
1765                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
1766
1767                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
1768                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1769                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
1770                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
1771
1772                                 $arr["object"] = self::construct_new_friend_object($contact);
1773
1774                                 $arr["last-child"] = 1;
1775
1776                                 $arr["allow_cid"] = $user[0]["allow_cid"];
1777                                 $arr["allow_gid"] = $user[0]["allow_gid"];
1778                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
1779                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
1780
1781                                 $i = item_store($arr);
1782                                 if($i)
1783                                         proc_run("php", "include/notifier.php", "activity", $i);
1784                         }
1785                 }
1786         }
1787
1788         /**
1789          * @brief Creates a XML object for a "new friend" message
1790          *
1791          * @param array $contact Array of the contact
1792          *
1793          * @return string The XML
1794          */
1795         private function construct_new_friend_object($contact) {
1796                 $objtype = ACTIVITY_OBJ_PERSON;
1797                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
1798                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
1799
1800                 $xmldata = array("object" => array("type" => $objtype,
1801                                                 "title" => $contact["name"],
1802                                                 "id" => $contact["url"]."/".$contact["name"],
1803                                                 "link" => $link));
1804
1805                 return xml::from_array($xmldata, $xml, true);
1806         }
1807
1808         /**
1809          * @brief Processes incoming sharing notification
1810          *
1811          * @param array $importer Array of the importer user
1812          * @param object $data The message object
1813          *
1814          * @return bool Success
1815          */
1816         private function receive_contact_request($importer, $data) {
1817                 $author = unxmlify($data->author);
1818                 $recipient = unxmlify($data->recipient);
1819
1820                 if (!$author || !$recipient)
1821                         return false;
1822
1823                 // the current protocol version doesn't know these fields
1824                 // That means that we will assume their existance
1825                 if (isset($data->following))
1826                         $following = (unxmlify($data->following) == "true");
1827                 else
1828                         $following = true;
1829
1830                 if (isset($data->sharing))
1831                         $sharing = (unxmlify($data->sharing) == "true");
1832                 else
1833                         $sharing = true;
1834
1835                 $contact = self::contact_by_handle($importer["uid"],$author);
1836
1837                 // perhaps we were already sharing with this person. Now they're sharing with us.
1838                 // That makes us friends.
1839                 if ($contact) {
1840                         if ($following AND $sharing) {
1841                                 self::receive_request_make_friend($importer, $contact);
1842                                 return true;
1843                         } else /// @todo Handle all possible variations of adding and retracting of permissions
1844                                 return false;
1845                 }
1846
1847                 if (!$following AND $sharing AND in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
1848                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
1849                         return false;
1850                 } elseif (!$following AND !$sharing) {
1851                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
1852                         return false;
1853                 }
1854
1855                 $ret = self::person_by_handle($author);
1856
1857                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
1858                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
1859                         return false;
1860                 }
1861
1862                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
1863
1864                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
1865                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
1866                         intval($importer["uid"]),
1867                         dbesc($ret["network"]),
1868                         dbesc($ret["addr"]),
1869                         datetime_convert(),
1870                         dbesc($ret["url"]),
1871                         dbesc(normalise_link($ret["url"])),
1872                         dbesc($batch),
1873                         dbesc($ret["name"]),
1874                         dbesc($ret["nick"]),
1875                         dbesc($ret["photo"]),
1876                         dbesc($ret["pubkey"]),
1877                         dbesc($ret["notify"]),
1878                         dbesc($ret["poll"]),
1879                         1,
1880                         2
1881                 );
1882
1883                 // find the contact record we just created
1884
1885                 $contact_record = self::contact_by_handle($importer["uid"],$author);
1886
1887                 if (!$contact_record) {
1888                         logger("unable to locate newly created contact record.");
1889                         return;
1890                 }
1891
1892                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
1893
1894                 if(intval($def_gid))
1895                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
1896
1897                 update_contact_avatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
1898
1899                 if($importer["page-flags"] == PAGE_NORMAL) {
1900
1901                         $hash = random_string().(string)time();   // Generate a confirm_key
1902
1903                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
1904                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
1905                                 intval($importer["uid"]),
1906                                 intval($contact_record["id"]),
1907                                 0,
1908                                 0,
1909                                 dbesc(t("Sharing notification from Diaspora network")),
1910                                 dbesc($hash),
1911                                 dbesc(datetime_convert())
1912                         );
1913                 } else {
1914
1915                         // automatic friend approval
1916
1917                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
1918
1919                         // technically they are sharing with us (CONTACT_IS_SHARING),
1920                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
1921                         // we are going to change the relationship and make them a follower.
1922
1923                         if (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing AND $following)
1924                                 $new_relation = CONTACT_IS_FRIEND;
1925                         elseif (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing)
1926                                 $new_relation = CONTACT_IS_SHARING;
1927                         else
1928                                 $new_relation = CONTACT_IS_FOLLOWER;
1929
1930                         $r = q("UPDATE `contact` SET `rel` = %d,
1931                                 `name-date` = '%s',
1932                                 `uri-date` = '%s',
1933                                 `blocked` = 0,
1934                                 `pending` = 0,
1935                                 `writable` = 1
1936                                 WHERE `id` = %d
1937                                 ",
1938                                 intval($new_relation),
1939                                 dbesc(datetime_convert()),
1940                                 dbesc(datetime_convert()),
1941                                 intval($contact_record["id"])
1942                         );
1943
1944                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
1945                         if($u)
1946                                 $ret = self::send_share($u[0], $contact_record);
1947                 }
1948
1949                 return true;
1950         }
1951
1952         /**
1953          * @brief Fetches a message with a given guid
1954          *
1955          * @param string $guid message guid
1956          * @param string $orig_author handle of the original post
1957          * @param string $author handle of the sharer
1958          *
1959          * @return array The fetched item
1960          */
1961         private function original_item($guid, $orig_author, $author) {
1962
1963                 // Do we already have this item?
1964                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
1965                                 `author-name`, `author-link`, `author-avatar`
1966                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
1967                         dbesc($guid));
1968
1969                 if($r) {
1970                         logger("reshared message ".$guid." already exists on system.");
1971
1972                         // Maybe it is already a reshared item?
1973                         // Then refetch the content, if it is a reshare from a reshare.
1974                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
1975                         if (self::is_reshare($r[0]["body"], true))
1976                                 $r = array();
1977                         elseif (self::is_reshare($r[0]["body"], false)) {
1978                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
1979
1980                                 // Add OEmbed and other information to the body
1981                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
1982
1983                                 return $r[0];
1984                         } else
1985                                 return $r[0];
1986                 }
1987
1988                 if (!$r) {
1989                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
1990                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
1991                         $item_id = self::store_by_guid($guid, $server);
1992
1993                         if (!$item_id) {
1994                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
1995                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
1996                                 $item_id = self::store_by_guid($guid, $server);
1997                         }
1998
1999                         if ($item_id) {
2000                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2001                                                 `author-name`, `author-link`, `author-avatar`
2002                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2003                                         intval($item_id));
2004
2005                                 if ($r) {
2006                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2007                                         if (self::is_reshare($r[0]["body"], false))
2008                                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2009
2010                                         return $r[0];
2011                                 }
2012
2013                         }
2014                 }
2015                 return false;
2016         }
2017
2018         /**
2019          * @brief Processes a reshare message
2020          *
2021          * @param array $importer Array of the importer user
2022          * @param object $data The message object
2023          * @param string $xml The original XML of the message
2024          *
2025          * @return int the message id
2026          */
2027         private function receive_reshare($importer, $data, $xml) {
2028                 $root_author = notags(unxmlify($data->root_author));
2029                 $root_guid = notags(unxmlify($data->root_guid));
2030                 $guid = notags(unxmlify($data->guid));
2031                 $author = notags(unxmlify($data->author));
2032                 $public = notags(unxmlify($data->public));
2033                 $created_at = notags(unxmlify($data->created_at));
2034
2035                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2036                 if (!$contact)
2037                         return false;
2038
2039                 $message_id = self::message_exists($importer["uid"], $guid);
2040                 if ($message_id)
2041                         return $message_id;
2042
2043                 $original_item = self::original_item($root_guid, $root_author, $author);
2044                 if (!$original_item)
2045                         return false;
2046
2047                 $orig_url = App::get_baseurl()."/display/".$original_item["guid"];
2048
2049                 $datarray = array();
2050
2051                 $datarray["uid"] = $importer["uid"];
2052                 $datarray["contact-id"] = $contact["id"];
2053                 $datarray["network"]  = NETWORK_DIASPORA;
2054
2055                 $datarray["author-name"] = $contact["name"];
2056                 $datarray["author-link"] = $contact["url"];
2057                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2058
2059                 $datarray["owner-name"] = $datarray["author-name"];
2060                 $datarray["owner-link"] = $datarray["author-link"];
2061                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2062
2063                 $datarray["guid"] = $guid;
2064                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2065
2066                 $datarray["verb"] = ACTIVITY_POST;
2067                 $datarray["gravity"] = GRAVITY_PARENT;
2068
2069                 $datarray["object"] = $xml;
2070
2071                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
2072                                         $original_item["guid"], $original_item["created"], $orig_url);
2073                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2074
2075                 $datarray["tag"] = $original_item["tag"];
2076                 $datarray["app"]  = $original_item["app"];
2077
2078                 $datarray["plink"] = self::plink($author, $guid);
2079                 $datarray["private"] = (($public == "false") ? 1 : 0);
2080                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = datetime_convert("UTC", "UTC", $created_at);
2081
2082                 $datarray["object-type"] = $original_item["object-type"];
2083
2084                 self::fetch_guid($datarray);
2085                 $message_id = item_store($datarray);
2086
2087                 if ($message_id)
2088                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2089
2090                 return $message_id;
2091         }
2092
2093         /**
2094          * @brief Processes retractions
2095          *
2096          * @param array $importer Array of the importer user
2097          * @param array $contact The contact of the item owner
2098          * @param object $data The message object
2099          *
2100          * @return bool success
2101          */
2102         private function item_retraction($importer, $contact, $data) {
2103                 $target_type = notags(unxmlify($data->target_type));
2104                 $target_guid = notags(unxmlify($data->target_guid));
2105                 $author = notags(unxmlify($data->author));
2106
2107                 $person = self::person_by_handle($author);
2108                 if (!is_array($person)) {
2109                         logger("unable to find author detail for ".$author);
2110                         return false;
2111                 }
2112
2113                 $r = q("SELECT `id`, `parent`, `parent-uri`, `author-link` FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
2114                         dbesc($target_guid),
2115                         intval($importer["uid"])
2116                 );
2117                 if (!$r)
2118                         return false;
2119
2120                 // Only delete it if the author really fits
2121                 if (!link_compare($r[0]["author-link"], $person["url"])) {
2122                         logger("Item author ".$r[0]["author-link"]." doesn't fit to expected contact ".$person["url"], LOGGER_DEBUG);
2123                         return false;
2124                 }
2125
2126                 // Check if the sender is the thread owner
2127                 $p = q("SELECT `id`, `author-link`, `origin` FROM `item` WHERE `id` = %d",
2128                         intval($r[0]["parent"]));
2129
2130                 // Only delete it if the parent author really fits
2131                 if (!link_compare($p[0]["author-link"], $contact["url"]) AND !link_compare($r[0]["author-link"], $contact["url"])) {
2132                         logger("Thread author ".$p[0]["author-link"]." and item author ".$r[0]["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2133                         return false;
2134                 }
2135
2136                 // 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
2137                 q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' WHERE `id` = %d",
2138                         dbesc(datetime_convert()),
2139                         dbesc(datetime_convert()),
2140                         intval($r[0]["id"])
2141                 );
2142                 delete_thread($r[0]["id"], $r[0]["parent-uri"]);
2143
2144                 logger("Deleted target ".$target_guid." (".$r[0]["id"].") from user ".$importer["uid"]." parent: ".$p[0]["id"], LOGGER_DEBUG);
2145
2146                 // Now check if the retraction needs to be relayed by us
2147                 if($p[0]["origin"]) {
2148                         // notify others
2149                         proc_run("php", "include/notifier.php", "drop", $r[0]["id"]);
2150                 }
2151
2152                 return true;
2153         }
2154
2155         /**
2156          * @brief Receives retraction messages
2157          *
2158          * @param array $importer Array of the importer user
2159          * @param string $sender The sender of the message
2160          * @param object $data The message object
2161          *
2162          * @return bool Success
2163          */
2164         private function receive_retraction($importer, $sender, $data) {
2165                 $target_type = notags(unxmlify($data->target_type));
2166
2167                 $contact = self::contact_by_handle($importer["uid"], $sender);
2168                 if (!$contact) {
2169                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2170                         return false;
2171                 }
2172
2173                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2174
2175                 switch ($target_type) {
2176                         case "Comment":
2177                         case "Like":
2178                         case "Post": // "Post" will be supported in a future version
2179                         case "Reshare":
2180                         case "StatusMessage":
2181                                 return self::item_retraction($importer, $contact, $data);;
2182
2183                         case "Contact":
2184                         case "Person":
2185                                 /// @todo What should we do with an "unshare"?
2186                                 // Removing the contact isn't correct since we still can read the public items
2187                                 contact_remove($contact["id"]);
2188                                 return true;
2189
2190                         default:
2191                                 logger("Unknown target type ".$target_type);
2192                                 return false;
2193                 }
2194                 return true;
2195         }
2196
2197         /**
2198          * @brief Receives status messages
2199          *
2200          * @param array $importer Array of the importer user
2201          * @param object $data The message object
2202          * @param string $xml The original XML of the message
2203          *
2204          * @return int The message id of the newly created item
2205          */
2206         private function receive_status_message($importer, $data, $xml) {
2207
2208                 $raw_message = unxmlify($data->raw_message);
2209                 $guid = notags(unxmlify($data->guid));
2210                 $author = notags(unxmlify($data->author));
2211                 $public = notags(unxmlify($data->public));
2212                 $created_at = notags(unxmlify($data->created_at));
2213                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2214
2215                 /// @todo enable support for polls
2216                 //if ($data->poll) {
2217                 //      foreach ($data->poll AS $poll)
2218                 //              print_r($poll);
2219                 //      die("poll!\n");
2220                 //}
2221                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2222                 if (!$contact)
2223                         return false;
2224
2225                 $message_id = self::message_exists($importer["uid"], $guid);
2226                 if ($message_id)
2227                         return $message_id;
2228
2229                 $address = array();
2230                 if ($data->location)
2231                         foreach ($data->location->children() AS $fieldname => $data)
2232                                 $address[$fieldname] = notags(unxmlify($data));
2233
2234                 $body = diaspora2bb($raw_message);
2235
2236                 $datarray = array();
2237
2238                 // Attach embedded pictures to the body
2239                 if ($data->photo) {
2240                         foreach ($data->photo AS $photo)
2241                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2242                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2243
2244                         $datarray["object-type"] = ACTIVITY_OBJ_PHOTO;
2245                 } else {
2246                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2247
2248                         // Add OEmbed and other information to the body
2249                         if (!self::is_redmatrix($contact["url"]))
2250                                 $body = add_page_info_to_body($body, false, true);
2251                 }
2252
2253                 $datarray["uid"] = $importer["uid"];
2254                 $datarray["contact-id"] = $contact["id"];
2255                 $datarray["network"] = NETWORK_DIASPORA;
2256
2257                 $datarray["author-name"] = $contact["name"];
2258                 $datarray["author-link"] = $contact["url"];
2259                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2260
2261                 $datarray["owner-name"] = $datarray["author-name"];
2262                 $datarray["owner-link"] = $datarray["author-link"];
2263                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2264
2265                 $datarray["guid"] = $guid;
2266                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2267
2268                 $datarray["verb"] = ACTIVITY_POST;
2269                 $datarray["gravity"] = GRAVITY_PARENT;
2270
2271                 $datarray["object"] = $xml;
2272
2273                 $datarray["body"] = $body;
2274
2275                 if ($provider_display_name != "")
2276                         $datarray["app"] = $provider_display_name;
2277
2278                 $datarray["plink"] = self::plink($author, $guid);
2279                 $datarray["private"] = (($public == "false") ? 1 : 0);
2280                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = datetime_convert("UTC", "UTC", $created_at);
2281
2282                 if (isset($address["address"]))
2283                         $datarray["location"] = $address["address"];
2284
2285                 if (isset($address["lat"]) AND isset($address["lng"]))
2286                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2287
2288                 self::fetch_guid($datarray);
2289                 $message_id = item_store($datarray);
2290
2291                 if ($message_id)
2292                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2293
2294                 return $message_id;
2295         }
2296
2297         /* ************************************************************************************** *
2298          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2299          * ************************************************************************************** */
2300
2301         /**
2302          * @brief returnes the handle of a contact
2303          *
2304          * @param array $me contact array
2305          *
2306          * @return string the handle in the format user@domain.tld
2307          */
2308         private function my_handle($contact) {
2309                 if ($contact["addr"] != "")
2310                         return $contact["addr"];
2311
2312                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2313                 // So - just in case - we build the the address here.
2314                 if ($contact["nickname"] != "")
2315                         $nick = $contact["nickname"];
2316                 else
2317                         $nick = $contact["nick"];
2318
2319                 return $nick."@".substr(App::get_baseurl(), strpos(App::get_baseurl(),"://") + 3);
2320         }
2321
2322         /**
2323          * @brief Creates the envelope for the "fetch" endpoint
2324          *
2325          * @param string $msg The message that is to be transmitted
2326          * @param array $user The record of the sender
2327          *
2328          * @return string The envelope
2329          */
2330
2331         public static function build_magic_envelope($msg, $user) {
2332
2333                 $b64url_data = base64url_encode($msg);
2334                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2335
2336                 $key_id = base64url_encode(diaspora::my_handle($user));
2337                 $type = "application/xml";
2338                 $encoding = "base64url";
2339                 $alg = "RSA-SHA256";
2340                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2341                 $signature = rsa_sign($signable_data, $user["prvkey"]);
2342                 $sig = base64url_encode($signature);
2343
2344                 $xmldata = array("me:env" => array("me:data" => $data,
2345                                                         "@attributes" => array("type" => $type),
2346                                                         "me:encoding" => $encoding,
2347                                                         "me:alg" => $alg,
2348                                                         "me:sig" => $sig,
2349                                                         "@attributes2" => array("key_id" => $key_id)));
2350
2351                 $namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
2352
2353                 return xml::from_array($xmldata, $xml, false, $namespaces);
2354         }
2355
2356         /**
2357          * @brief Creates the envelope for a public message
2358          *
2359          * @param string $msg The message that is to be transmitted
2360          * @param array $user The record of the sender
2361          * @param array $contact Target of the communication
2362          * @param string $prvkey The private key of the sender
2363          * @param string $pubkey The public key of the receiver
2364          *
2365          * @return string The envelope
2366          */
2367         private function build_public_message($msg, $user, $contact, $prvkey, $pubkey) {
2368
2369                 logger("Message: ".$msg, LOGGER_DATA);
2370
2371                 $handle = self::my_handle($user);
2372
2373                 $b64url_data = base64url_encode($msg);
2374
2375                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2376
2377                 $type = "application/xml";
2378                 $encoding = "base64url";
2379                 $alg = "RSA-SHA256";
2380
2381                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2382
2383                 $signature = rsa_sign($signable_data,$prvkey);
2384                 $sig = base64url_encode($signature);
2385
2386                 $xmldata = array("diaspora" => array("header" => array("author_id" => $handle),
2387                                                         "me:env" => array("me:encoding" => $encoding,
2388                                                         "me:alg" => $alg,
2389                                                         "me:data" => $data,
2390                                                         "@attributes" => array("type" => $type),
2391                                                         "me:sig" => $sig)));
2392
2393                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2394                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2395
2396                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2397
2398                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2399                 return $magic_env;
2400         }
2401
2402         /**
2403          * @brief Creates the envelope for a private message
2404          *
2405          * @param string $msg The message that is to be transmitted
2406          * @param array $user The record of the sender
2407          * @param array $contact Target of the communication
2408          * @param string $prvkey The private key of the sender
2409          * @param string $pubkey The public key of the receiver
2410          *
2411          * @return string The envelope
2412          */
2413         private function build_private_message($msg, $user, $contact, $prvkey, $pubkey) {
2414
2415                 logger("Message: ".$msg, LOGGER_DATA);
2416
2417                 // without a public key nothing will work
2418
2419                 if (!$pubkey) {
2420                         logger("pubkey missing: contact id: ".$contact["id"]);
2421                         return false;
2422                 }
2423
2424                 $inner_aes_key = random_string(32);
2425                 $b_inner_aes_key = base64_encode($inner_aes_key);
2426                 $inner_iv = random_string(16);
2427                 $b_inner_iv = base64_encode($inner_iv);
2428
2429                 $outer_aes_key = random_string(32);
2430                 $b_outer_aes_key = base64_encode($outer_aes_key);
2431                 $outer_iv = random_string(16);
2432                 $b_outer_iv = base64_encode($outer_iv);
2433
2434                 $handle = self::my_handle($user);
2435
2436                 $padded_data = pkcs5_pad($msg,16);
2437                 $inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);
2438
2439                 $b64_data = base64_encode($inner_encrypted);
2440
2441
2442                 $b64url_data = base64url_encode($b64_data);
2443                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2444
2445                 $type = "application/xml";
2446                 $encoding = "base64url";
2447                 $alg = "RSA-SHA256";
2448
2449                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2450
2451                 $signature = rsa_sign($signable_data,$prvkey);
2452                 $sig = base64url_encode($signature);
2453
2454                 $xmldata = array("decrypted_header" => array("iv" => $b_inner_iv,
2455                                                         "aes_key" => $b_inner_aes_key,
2456                                                         "author_id" => $handle));
2457
2458                 $decrypted_header = xml::from_array($xmldata, $xml, true);
2459                 $decrypted_header = pkcs5_pad($decrypted_header,16);
2460
2461                 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
2462
2463                 $outer_json = json_encode(array("iv" => $b_outer_iv, "key" => $b_outer_aes_key));
2464
2465                 $encrypted_outer_key_bundle = "";
2466                 openssl_public_encrypt($outer_json, $encrypted_outer_key_bundle, $pubkey);
2467
2468                 $b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);
2469
2470                 logger("outer_bundle: ".$b64_encrypted_outer_key_bundle." key: ".$pubkey, LOGGER_DATA);
2471
2472                 $encrypted_header_json_object = json_encode(array("aes_key" => base64_encode($encrypted_outer_key_bundle),
2473                                                                 "ciphertext" => base64_encode($ciphertext)));
2474                 $cipher_json = base64_encode($encrypted_header_json_object);
2475
2476                 $xmldata = array("diaspora" => array("encrypted_header" => $cipher_json,
2477                                                 "me:env" => array("me:encoding" => $encoding,
2478                                                                 "me:alg" => $alg,
2479                                                                 "me:data" => $data,
2480                                                                 "@attributes" => array("type" => $type),
2481                                                                 "me:sig" => $sig)));
2482
2483                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2484                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2485
2486                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2487
2488                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2489                 return $magic_env;
2490         }
2491
2492         /**
2493          * @brief Create the envelope for a message
2494          *
2495          * @param string $msg The message that is to be transmitted
2496          * @param array $user The record of the sender
2497          * @param array $contact Target of the communication
2498          * @param string $prvkey The private key of the sender
2499          * @param string $pubkey The public key of the receiver
2500          * @param bool $public Is the message public?
2501          *
2502          * @return string The message that will be transmitted to other servers
2503          */
2504         private function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
2505
2506                 if ($public)
2507                         $magic_env =  self::build_public_message($msg,$user,$contact,$prvkey,$pubkey);
2508                 else
2509                         $magic_env =  self::build_private_message($msg,$user,$contact,$prvkey,$pubkey);
2510
2511                 // The data that will be transmitted is double encoded via "urlencode", strange ...
2512                 $slap = "xml=".urlencode(urlencode($magic_env));
2513                 return $slap;
2514         }
2515
2516         /**
2517          * @brief Creates a signature for a message
2518          *
2519          * @param array $owner the array of the owner of the message
2520          * @param array $message The message that is to be signed
2521          *
2522          * @return string The signature
2523          */
2524         private function signature($owner, $message) {
2525                 $sigmsg = $message;
2526                 unset($sigmsg["author_signature"]);
2527                 unset($sigmsg["parent_author_signature"]);
2528
2529                 $signed_text = implode(";", $sigmsg);
2530
2531                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2532         }
2533
2534         /**
2535          * @brief Transmit a message to a target server
2536          *
2537          * @param array $owner the array of the item owner
2538          * @param array $contact Target of the communication
2539          * @param string $slap The message that is to be transmitted
2540          * @param bool $public_batch Is it a public post?
2541          * @param bool $queue_run Is the transmission called from the queue?
2542          * @param string $guid message guid
2543          *
2544          * @return int Result of the transmission
2545          */
2546         public static function transmit($owner, $contact, $slap, $public_batch, $queue_run=false, $guid = "") {
2547
2548                 $a = get_app();
2549
2550                 $enabled = intval(get_config("system", "diaspora_enabled"));
2551                 if(!$enabled)
2552                         return 200;
2553
2554                 $logid = random_string(4);
2555                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2556                 if (!$dest_url) {
2557                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2558                         return 0;
2559                 }
2560
2561                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2562
2563                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2564                         $return_code = 0;
2565                 } else {
2566                         if (!intval(get_config("system", "diaspora_test"))) {
2567                                 post_url($dest_url."/", $slap);
2568                                 $return_code = $a->get_curl_code();
2569                         } else {
2570                                 logger("test_mode");
2571                                 return 200;
2572                         }
2573                 }
2574
2575                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2576
2577                 if(!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2578                         logger("queue message");
2579
2580                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2581                                 intval($contact["id"]),
2582                                 dbesc(NETWORK_DIASPORA),
2583                                 dbesc($slap),
2584                                 intval($public_batch)
2585                         );
2586                         if($r) {
2587                                 logger("add_to_queue ignored - identical item already in queue");
2588                         } else {
2589                                 // queue message for redelivery
2590                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $slap, $public_batch);
2591                         }
2592                 }
2593
2594                 return(($return_code) ? $return_code : (-1));
2595         }
2596
2597
2598         /**
2599          * @brief Build the post xml
2600          *
2601          * @param string $type The message type
2602          * @param array $message The message data
2603          *
2604          * @return string The post XML
2605          */
2606         public static function build_post_xml($type, $message) {
2607
2608                 $data = array("XML" => array("post" => array($type => $message)));
2609                 return xml::from_array($data, $xml);
2610         }
2611
2612         /**
2613          * @brief Builds and transmit messages
2614          *
2615          * @param array $owner the array of the item owner
2616          * @param array $contact Target of the communication
2617          * @param string $type The message type
2618          * @param array $message The message data
2619          * @param bool $public_batch Is it a public post?
2620          * @param string $guid message guid
2621          * @param bool $spool Should the transmission be spooled or transmitted?
2622          *
2623          * @return int Result of the transmission
2624          */
2625         private function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false) {
2626
2627                 $msg = self::build_post_xml($type, $message);
2628
2629                 logger('message: '.$msg, LOGGER_DATA);
2630                 logger('send guid '.$guid, LOGGER_DEBUG);
2631
2632                 $slap = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
2633
2634                 if ($spool) {
2635                         add_to_queue($contact['id'], NETWORK_DIASPORA, $slap, $public_batch);
2636                         return true;
2637                 } else
2638                         $return_code = self::transmit($owner, $contact, $slap, $public_batch, false, $guid);
2639
2640                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
2641
2642                 return $return_code;
2643         }
2644
2645         /**
2646          * @brief Sends a "share" message
2647          *
2648          * @param array $owner the array of the item owner
2649          * @param array $contact Target of the communication
2650          *
2651          * @return int The result of the transmission
2652          */
2653         public static function send_share($owner,$contact) {
2654
2655                 $message = array("sender_handle" => self::my_handle($owner),
2656                                 "recipient_handle" => $contact["addr"]);
2657
2658                 return self::build_and_transmit($owner, $contact, "request", $message);
2659         }
2660
2661         /**
2662          * @brief sends an "unshare"
2663          *
2664          * @param array $owner the array of the item owner
2665          * @param array $contact Target of the communication
2666          *
2667          * @return int The result of the transmission
2668          */
2669         public static function send_unshare($owner,$contact) {
2670
2671                 $message = array("post_guid" => $owner["guid"],
2672                                 "diaspora_handle" => self::my_handle($owner),
2673                                 "type" => "Person");
2674
2675                 return self::build_and_transmit($owner, $contact, "retraction", $message);
2676         }
2677
2678         /**
2679          * @brief Checks a message body if it is a reshare
2680          *
2681          * @param string $body The message body that is to be check
2682          * @param bool $complete Should it be a complete check or a simple check?
2683          *
2684          * @return array|bool Reshare details or "false" if no reshare
2685          */
2686         public static function is_reshare($body, $complete = true) {
2687                 $body = trim($body);
2688
2689                 // Skip if it isn't a pure repeated messages
2690                 // Does it start with a share?
2691                 if ((strpos($body, "[share") > 0) AND $complete)
2692                         return(false);
2693
2694                 // Does it end with a share?
2695                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
2696                         return(false);
2697
2698                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
2699                 // Skip if there is no shared message in there
2700                 if ($body == $attributes)
2701                         return(false);
2702
2703                 // If we don't do the complete check we quit here
2704                 if (!$complete)
2705                         return true;
2706
2707                 $guid = "";
2708                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
2709                 if ($matches[1] != "")
2710                         $guid = $matches[1];
2711
2712                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
2713                 if ($matches[1] != "")
2714                         $guid = $matches[1];
2715
2716                 if ($guid != "") {
2717                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
2718                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
2719                         if ($r) {
2720                                 $ret= array();
2721                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
2722                                 $ret["root_guid"] = $guid;
2723                                 return($ret);
2724                         }
2725                 }
2726
2727                 $profile = "";
2728                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
2729                 if ($matches[1] != "")
2730                         $profile = $matches[1];
2731
2732                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
2733                 if ($matches[1] != "")
2734                         $profile = $matches[1];
2735
2736                 $ret= array();
2737
2738                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
2739                 if (($ret["root_handle"] == $profile) OR ($ret["root_handle"] == ""))
2740                         return(false);
2741
2742                 $link = "";
2743                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
2744                 if ($matches[1] != "")
2745                         $link = $matches[1];
2746
2747                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
2748                 if ($matches[1] != "")
2749                         $link = $matches[1];
2750
2751                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
2752                 if (($ret["root_guid"] == $link) OR (trim($ret["root_guid"]) == ""))
2753                         return(false);
2754
2755                 return($ret);
2756         }
2757
2758         /**
2759          * @brief Create a post (status message or reshare)
2760          *
2761          * @param array $item The item that will be exported
2762          * @param array $owner the array of the item owner
2763          *
2764          * @return array
2765          * 'type' -> Message type ("status_message" or "reshare")
2766          * 'message' -> Array of XML elements of the status
2767          */
2768         public static function build_status($item, $owner) {
2769
2770                 $myaddr = self::my_handle($owner);
2771
2772                 $public = (($item["private"]) ? "false" : "true");
2773
2774                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
2775
2776                 // Detect a share element and do a reshare
2777                 if (!$item['private'] AND ($ret = self::is_reshare($item["body"]))) {
2778                         $message = array("root_diaspora_id" => $ret["root_handle"],
2779                                         "root_guid" => $ret["root_guid"],
2780                                         "guid" => $item["guid"],
2781                                         "diaspora_handle" => $myaddr,
2782                                         "public" => $public,
2783                                         "created_at" => $created,
2784                                         "provider_display_name" => $item["app"]);
2785
2786                         $type = "reshare";
2787                 } else {
2788                         $title = $item["title"];
2789                         $body = $item["body"];
2790
2791                         // convert to markdown
2792                         $body = html_entity_decode(bb2diaspora($body));
2793
2794                         // Adding the title
2795                         if(strlen($title))
2796                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
2797
2798                         if ($item["attach"]) {
2799                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
2800                                 if(cnt) {
2801                                         $body .= "\n".t("Attachments:")."\n";
2802                                         foreach($matches as $mtch)
2803                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
2804                                 }
2805                         }
2806
2807                         $location = array();
2808
2809                         if ($item["location"] != "")
2810                                 $location["address"] = $item["location"];
2811
2812                         if ($item["coord"] != "") {
2813                                 $coord = explode(" ", $item["coord"]);
2814                                 $location["lat"] = $coord[0];
2815                                 $location["lng"] = $coord[1];
2816                         }
2817
2818                         $message = array("raw_message" => $body,
2819                                         "location" => $location,
2820                                         "guid" => $item["guid"],
2821                                         "diaspora_handle" => $myaddr,
2822                                         "public" => $public,
2823                                         "created_at" => $created,
2824                                         "provider_display_name" => $item["app"]);
2825
2826                         if (count($location) == 0)
2827                                 unset($message["location"]);
2828
2829                         $type = "status_message";
2830                 }
2831                 return array("type" => $type, "message" => $message);
2832         }
2833
2834         /**
2835          * @brief Sends a post
2836          *
2837          * @param array $item The item that will be exported
2838          * @param array $owner the array of the item owner
2839          * @param array $contact Target of the communication
2840          * @param bool $public_batch Is it a public post?
2841          *
2842          * @return int The result of the transmission
2843          */
2844         public static function send_status($item, $owner, $contact, $public_batch = false) {
2845
2846                 $status = diaspora::build_status($item, $owner);
2847
2848                 return self::build_and_transmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
2849         }
2850
2851         /**
2852          * @brief Creates a "like" object
2853          *
2854          * @param array $item The item that will be exported
2855          * @param array $owner the array of the item owner
2856          *
2857          * @return array The data for a "like"
2858          */
2859         private function construct_like($item, $owner) {
2860
2861                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
2862                         dbesc($item["thr-parent"]));
2863                 if(!$p)
2864                         return false;
2865
2866                 $parent = $p[0];
2867
2868                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
2869                 $positive = "true";
2870
2871                 return(array("positive" => $positive,
2872                                 "guid" => $item["guid"],
2873                                 "target_type" => $target_type,
2874                                 "parent_guid" => $parent["guid"],
2875                                 "author_signature" => "",
2876                                 "diaspora_handle" => self::my_handle($owner)));
2877         }
2878
2879         /**
2880          * @brief Creates the object for a comment
2881          *
2882          * @param array $item The item that will be exported
2883          * @param array $owner the array of the item owner
2884          *
2885          * @return array The data for a comment
2886          */
2887         private function construct_comment($item, $owner) {
2888
2889                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
2890                         intval($item["parent"]),
2891                         intval($item["parent"])
2892                 );
2893
2894                 if (!$p)
2895                         return false;
2896
2897                 $parent = $p[0];
2898
2899                 $text = html_entity_decode(bb2diaspora($item["body"]));
2900
2901                 return(array("guid" => $item["guid"],
2902                                 "parent_guid" => $parent["guid"],
2903                                 "author_signature" => "",
2904                                 "text" => $text,
2905                                 "diaspora_handle" => self::my_handle($owner)));
2906         }
2907
2908         /**
2909          * @brief Send a like or a comment
2910          *
2911          * @param array $item The item that will be exported
2912          * @param array $owner the array of the item owner
2913          * @param array $contact Target of the communication
2914          * @param bool $public_batch Is it a public post?
2915          *
2916          * @return int The result of the transmission
2917          */
2918         public static function send_followup($item,$owner,$contact,$public_batch = false) {
2919
2920                 if($item['verb'] === ACTIVITY_LIKE) {
2921                         $message = self::construct_like($item, $owner);
2922                         $type = "like";
2923                 } else {
2924                         $message = self::construct_comment($item, $owner);
2925                         $type = "comment";
2926                 }
2927
2928                 if (!$message)
2929                         return false;
2930
2931                 $message["author_signature"] = self::signature($owner, $message);
2932
2933                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2934         }
2935
2936         /**
2937          * @brief Creates a message from a signature record entry
2938          *
2939          * @param array $item The item that will be exported
2940          * @param array $signature The entry of the "sign" record
2941          *
2942          * @return string The message
2943          */
2944         private function message_from_signature($item, $signature) {
2945
2946                 // Split the signed text
2947                 $signed_parts = explode(";", $signature['signed_text']);
2948
2949                 if ($item["deleted"])
2950                         $message = array("parent_author_signature" => "",
2951                                         "target_guid" => $signed_parts[0],
2952                                         "target_type" => $signed_parts[1],
2953                                         "sender_handle" => $signature['signer'],
2954                                         "target_author_signature" => $signature['signature']);
2955                 elseif ($item['verb'] === ACTIVITY_LIKE)
2956                         $message = array("positive" => $signed_parts[0],
2957                                         "guid" => $signed_parts[1],
2958                                         "target_type" => $signed_parts[2],
2959                                         "parent_guid" => $signed_parts[3],
2960                                         "parent_author_signature" => "",
2961                                         "author_signature" => $signature['signature'],
2962                                         "diaspora_handle" => $signed_parts[4]);
2963                 else {
2964                         // Remove the comment guid
2965                         $guid = array_shift($signed_parts);
2966
2967                         // Remove the parent guid
2968                         $parent_guid = array_shift($signed_parts);
2969
2970                         // Remove the handle
2971                         $handle = array_pop($signed_parts);
2972
2973                         // Glue the parts together
2974                         $text = implode(";", $signed_parts);
2975
2976                         $message = array("guid" => $guid,
2977                                         "parent_guid" => $parent_guid,
2978                                         "parent_author_signature" => "",
2979                                         "author_signature" => $signature['signature'],
2980                                         "text" => implode(";", $signed_parts),
2981                                         "diaspora_handle" => $handle);
2982                 }
2983                 return $message;
2984         }
2985
2986         /**
2987          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
2988          *
2989          * @param array $item The item that will be exported
2990          * @param array $owner the array of the item owner
2991          * @param array $contact Target of the communication
2992          * @param bool $public_batch Is it a public post?
2993          *
2994          * @return int The result of the transmission
2995          */
2996         public static function send_relay($item, $owner, $contact, $public_batch = false) {
2997
2998                 if ($item["deleted"])
2999                         return self::send_retraction($item, $owner, $contact, $public_batch, true);
3000                 elseif ($item['verb'] === ACTIVITY_LIKE)
3001                         $type = "like";
3002                 else
3003                         $type = "comment";
3004
3005                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3006
3007                 // fetch the original signature
3008
3009                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3010                         intval($item["id"]));
3011
3012                 if (!$r) {
3013                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3014                         return false;
3015                 }
3016
3017                 $signature = $r[0];
3018
3019                 // Old way - is used by the internal Friendica functions
3020                 /// @todo Change all signatur storing functions to the new format
3021                 if ($signature['signed_text'] AND $signature['signature'] AND $signature['signer'])
3022                         $message = self::message_from_signature($item, $signature);
3023                 else {// New way
3024                         $msg = json_decode($signature['signed_text'], true);
3025
3026                         $message = array();
3027                         if (is_array($msg)) {
3028                                 foreach ($msg AS $field => $data) {
3029                                         if (!$item["deleted"]) {
3030                                                 if ($field == "author")
3031                                                         $field = "diaspora_handle";
3032                                                 if ($field == "parent_type")
3033                                                         $field = "target_type";
3034                                         }
3035
3036                                         $message[$field] = $data;
3037                                 }
3038                         } else
3039                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3040                 }
3041
3042                 $message["parent_author_signature"] = self::signature($owner, $message);
3043
3044                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3045
3046                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3047         }
3048
3049         /**
3050          * @brief Sends a retraction (deletion) of a message, like or comment
3051          *
3052          * @param array $item The item that will be exported
3053          * @param array $owner the array of the item owner
3054          * @param array $contact Target of the communication
3055          * @param bool $public_batch Is it a public post?
3056          * @param bool $relay Is the retraction transmitted from a relay?
3057          *
3058          * @return int The result of the transmission
3059          */
3060         public static function send_retraction($item, $owner, $contact, $public_batch = false, $relay = false) {
3061
3062                 $itemaddr = self::handle_from_contact($item["contact-id"], $item["gcontact-id"]);
3063
3064                 // Check whether the retraction is for a top-level post or whether it's a relayable
3065                 if ($item["uri"] !== $item["parent-uri"]) {
3066                         $msg_type = "relayable_retraction";
3067                         $target_type = (($item["verb"] === ACTIVITY_LIKE) ? "Like" : "Comment");
3068                 } else {
3069                         $msg_type = "signed_retraction";
3070                         $target_type = "StatusMessage";
3071                 }
3072
3073                 if ($relay AND ($item["uri"] !== $item["parent-uri"]))
3074                         $signature = "parent_author_signature";
3075                 else
3076                         $signature = "target_author_signature";
3077
3078                 $signed_text = $item["guid"].";".$target_type;
3079
3080                 $message = array("target_guid" => $item['guid'],
3081                                 "target_type" => $target_type,
3082                                 "sender_handle" => $itemaddr,
3083                                 $signature => base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')));
3084
3085                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3086
3087                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3088         }
3089
3090         /**
3091          * @brief Sends a mail
3092          *
3093          * @param array $item The item that will be exported
3094          * @param array $owner The owner
3095          * @param array $contact Target of the communication
3096          *
3097          * @return int The result of the transmission
3098          */
3099         public static function send_mail($item, $owner, $contact) {
3100
3101                 $myaddr = self::my_handle($owner);
3102
3103                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3104                         intval($item["convid"]),
3105                         intval($item["uid"])
3106                 );
3107
3108                 if (!$r) {
3109                         logger("conversation not found.");
3110                         return;
3111                 }
3112                 $cnv = $r[0];
3113
3114                 $conv = array(
3115                         "guid" => $cnv["guid"],
3116                         "subject" => $cnv["subject"],
3117                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
3118                         "diaspora_handle" => $cnv["creator"],
3119                         "participant_handles" => $cnv["recips"]
3120                 );
3121
3122                 $body = bb2diaspora($item["body"]);
3123                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
3124
3125                 $signed_text = $item["guid"].";".$cnv["guid"].";".$body.";".$created.";".$myaddr.";".$cnv['guid'];
3126                 $sig = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
3127
3128                 $msg = array(
3129                         "guid" => $item["guid"],
3130                         "parent_guid" => $cnv["guid"],
3131                         "parent_author_signature" => $sig,
3132                         "author_signature" => $sig,
3133                         "text" => $body,
3134                         "created_at" => $created,
3135                         "diaspora_handle" => $myaddr,
3136                         "conversation_guid" => $cnv["guid"]
3137                 );
3138
3139                 if ($item["reply"]) {
3140                         $message = $msg;
3141                         $type = "message";
3142                 } else {
3143                         $message = array("guid" => $cnv["guid"],
3144                                         "subject" => $cnv["subject"],
3145                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
3146                                         "message" => $msg,
3147                                         "diaspora_handle" => $cnv["creator"],
3148                                         "participant_handles" => $cnv["recips"]);
3149
3150                         $type = "conversation";
3151                 }
3152
3153                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
3154         }
3155
3156         /**
3157          * @brief Sends profile data
3158          *
3159          * @param int $uid The user id
3160          */
3161         public static function send_profile($uid) {
3162
3163                 if (!$uid)
3164                         return;
3165
3166                 $recips = q("SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3167                         AND `uid` = %d AND `rel` != %d",
3168                         dbesc(NETWORK_DIASPORA),
3169                         intval($uid),
3170                         intval(CONTACT_IS_SHARING)
3171                 );
3172                 if (!$recips)
3173                         return;
3174
3175                 $r = q("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3176                         FROM `profile`
3177                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3178                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3179                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3180                         intval($uid)
3181                 );
3182
3183                 if (!$r)
3184                         return;
3185
3186                 $profile = $r[0];
3187
3188                 $handle = $profile["addr"];
3189                 $first = ((strpos($profile['name'],' ')
3190                         ? trim(substr($profile['name'],0,strpos($profile['name'],' '))) : $profile['name']));
3191                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3192                 $large = App::get_baseurl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3193                 $medium = App::get_baseurl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3194                 $small = App::get_baseurl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3195                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
3196
3197                 if ($searchable === 'true') {
3198                         $dob = '1000-00-00';
3199
3200                         if (($profile['dob']) && ($profile['dob'] != '0000-00-00'))
3201                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC','UTC',$profile['dob'],'m-d');
3202
3203                         $about = $profile['about'];
3204                         $about = strip_tags(bbcode($about));
3205
3206                         $location = formatted_location($profile);
3207                         $tags = '';
3208                         if ($profile['pub_keywords']) {
3209                                 $kw = str_replace(',',' ',$profile['pub_keywords']);
3210                                 $kw = str_replace('  ',' ',$kw);
3211                                 $arr = explode(' ',$profile['pub_keywords']);
3212                                 if (count($arr)) {
3213                                         for($x = 0; $x < 5; $x ++) {
3214                                                 if (trim($arr[$x]))
3215                                                         $tags .= '#'. trim($arr[$x]) .' ';
3216                                         }
3217                                 }
3218                         }
3219                         $tags = trim($tags);
3220                 }
3221
3222                 $message = array("diaspora_handle" => $handle,
3223                                 "first_name" => $first,
3224                                 "last_name" => $last,
3225                                 "image_url" => $large,
3226                                 "image_url_medium" => $medium,
3227                                 "image_url_small" => $small,
3228                                 "birthday" => $dob,
3229                                 "gender" => $profile['gender'],
3230                                 "bio" => $about,
3231                                 "location" => $location,
3232                                 "searchable" => $searchable,
3233                                 "tag_string" => $tags);
3234
3235                 foreach($recips as $recip)
3236                         self::build_and_transmit($profile, $recip, "profile", $message, false, "", true);
3237         }
3238
3239         /**
3240          * @brief Stores the signature for likes that are created on our system
3241          *
3242          * @param array $contact The contact array of the "like"
3243          * @param int $post_id The post id of the "like"
3244          *
3245          * @return bool Success
3246          */
3247         public static function store_like_signature($contact, $post_id) {
3248
3249                 // Is the contact the owner? Then fetch the private key
3250                 if (!$contact['self'] OR ($contact['uid'] == 0)) {
3251                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
3252                         return false;
3253                 }
3254
3255                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
3256                 if(!$r)
3257                         return false;
3258
3259                 $contact["uprvkey"] = $r[0]['prvkey'];
3260
3261                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
3262                 if (!$r)
3263                         return false;
3264
3265                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE)))
3266                         return false;
3267
3268                 $message = self::construct_like($r[0], $contact);
3269                 $message["author_signature"] = self::signature($contact, $message);
3270
3271                 // In the future we will store the signature more flexible to support new fields.
3272                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3273                 // (We are transmitting this data here via DFRN)
3274
3275                 $signed_text = $message["positive"].";".$message["guid"].";".$message["target_type"].";".
3276                                 $message["parent_guid"].";".$message["diaspora_handle"];
3277
3278                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3279                         intval($post_id),
3280                         dbesc($signed_text),
3281                         dbesc($message["author_signature"]),
3282                         dbesc($message["diaspora_handle"])
3283                 );
3284
3285                 // This here will replace the lines above, once Diaspora changed its protocol
3286                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3287                 //      intval($message_id),
3288                 //      dbesc(json_encode($message))
3289                 //);
3290
3291                 logger('Stored diaspora like signature');
3292                 return true;
3293         }
3294
3295         /**
3296          * @brief Stores the signature for comments that are created on our system
3297          *
3298          * @param array $item The item array of the comment
3299          * @param array $contact The contact array of the item owner
3300          * @param string $uprvkey The private key of the sender
3301          * @param int $message_id The message id of the comment
3302          *
3303          * @return bool Success
3304          */
3305         public static function store_comment_signature($item, $contact, $uprvkey, $message_id) {
3306
3307                 if ($uprvkey == "") {
3308                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
3309                         return false;
3310                 }
3311
3312                 $contact["uprvkey"] = $uprvkey;
3313
3314                 $message = self::construct_comment($item, $contact);
3315                 $message["author_signature"] = self::signature($contact, $message);
3316
3317                 // In the future we will store the signature more flexible to support new fields.
3318                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3319                 // (We are transmitting this data here via DFRN)
3320                 $signed_text = $message["guid"].";".$message["parent_guid"].";".
3321                                 $message["text"].";".$message["diaspora_handle"];
3322
3323                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3324                         intval($message_id),
3325                         dbesc($signed_text),
3326                         dbesc($message["author_signature"]),
3327                         dbesc($message["diaspora_handle"])
3328                 );
3329
3330                 // This here will replace the lines above, once Diaspora changed its protocol
3331                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3332                 //      intval($message_id),
3333                 //      dbesc(json_encode($message))
3334                 //);
3335
3336                 logger('Stored diaspora comment signature');
3337                 return true;
3338         }
3339 }
3340 ?>