include/diaspora.php

   1 <?php
   2 /**
   3  * @file include/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  *
   6  * The new protocol is described here: http://diaspora.github.io/diaspora_federation/index.html
   7  * Currently this implementation here interprets the old and the new protocol and sends the old one.
   8  * This will change in the future.
   9  */
  10
  11 require_once("include/items.php");
  12 require_once("include/bb2diaspora.php");
  13 require_once("include/Scrape.php");
  14 require_once("include/Contact.php");
  15 require_once("include/Photo.php");
  16 require_once("include/socgraph.php");
  17 require_once("include/group.php");
  18 require_once("include/xml.php");
  19 require_once("include/datetime.php");
  20 require_once("include/queue_fn.php");
  21
  22 /**
  23  * @brief This class contain functions to create and send Diaspora XML files
  24  *
  25  */
  26 class diaspora {
  27
  28         /**
  29          * @brief Return a list of relay servers
  30          *
  31          * This is an experimental Diaspora feature.
  32          *
  33          * @return array of relay servers
  34          */
  35         public static function relay_list() {
  36
  37                 $serverdata = get_config("system", "relay_server");
  38                 if ($serverdata == "")
  39                         return array();
  40
  41                 $relay = array();
  42
  43                 $servers = explode(",", $serverdata);
  44
  45                 foreach($servers AS $server) {
  46                         $server = trim($server);
  47                         $batch = $server."/receive/public";
  48
  49                         $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  50
  51                         if (!$relais) {
  52                                 $addr = "relay@".str_replace("http://", "", normalise_link($server));
  53
  54                                 $r = q("INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
  55                                         VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
  56                                         datetime_convert(),
  57                                         dbesc($addr),
  58                                         dbesc($addr),
  59                                         dbesc($server),
  60                                         dbesc(normalise_link($server)),
  61                                         dbesc($batch),
  62                                         dbesc(NETWORK_DIASPORA),
  63                                         intval(CONTACT_IS_FOLLOWER),
  64                                         dbesc(datetime_convert()),
  65                                         dbesc(datetime_convert()),
  66                                         dbesc(datetime_convert())
  67                                 );
  68
  69                                 $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  70                                 if ($relais)
  71                                         $relay[] = $relais[0];
  72                         } else
  73                                 $relay[] = $relais[0];
  74                 }
  75
  76                 return $relay;
  77         }
  78
  79         /**
  80          * @brief repairs a signature that was double encoded
  81          *
  82          * The function is unused at the moment. It was copied from the old implementation.
  83          *
  84          * @param string $signature The signature
  85          * @param string $handle The handle of the signature owner
  86          * @param integer $level This value is only set inside this function to avoid endless loops
  87          *
  88          * @return string the repaired signature
  89          */
  90         private function repair_signature($signature, $handle = "", $level = 1) {
  91
  92                 if ($signature == "")
  93                         return ($signature);
  94
  95                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
  96                         $signature = base64_decode($signature);
  97                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
  98
  99                         // Do a recursive call to be able to fix even multiple levels
 100                         if ($level < 10)
 101                                 $signature = self::repair_signature($signature, $handle, ++$level);
 102                 }
 103
 104                 return($signature);
 105         }
 106
 107         /**
 108          * @brief verify the envelope and return the verified data
 109          *
 110          * @param string $envelope The magic envelope
 111          *
 112          * @return string verified data
 113          */
 114         private function verify_magic_envelope($envelope) {
 115
 116                 $basedom = parse_xml_string($envelope, false);
 117
 118                 if (!is_object($basedom)) {
 119                         logger("Envelope is no XML file");
 120                         return false;
 121                 }
 122
 123                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 124
 125                 if (sizeof($children) == 0) {
 126                         logger("XML has no children");
 127                         return false;
 128                 }
 129
 130                 $handle = "";
 131
 132                 $data = base64url_decode($children->data);
 133                 $type = $children->data->attributes()->type[0];
 134
 135                 $encoding = $children->encoding;
 136
 137                 $alg = $children->alg;
 138
 139                 $sig = base64url_decode($children->sig);
 140                 $key_id = $children->sig->attributes()->key_id[0];
 141                 if ($key_id != "")
 142                         $handle = base64url_decode($key_id);
 143
 144                 $b64url_data = base64url_encode($data);
 145                 $msg = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
 146
 147                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 148
 149                 $key = self::key($handle);
 150
 151                 $verify = rsa_verify($signable_data, $sig, $key);
 152                 if (!$verify) {
 153                         logger('Message did not verify. Discarding.');
 154                         return false;
 155                 }
 156
 157                 return $data;
 158         }
 159
 160         /**
 161          * @brief: Decodes incoming Diaspora message
 162          *
 163          * @param array $importer Array of the importer user
 164          * @param string $xml urldecoded Diaspora salmon
 165          *
 166          * @return array
 167          * 'message' -> decoded Diaspora XML message
 168          * 'author' -> author diaspora handle
 169          * 'key' -> author public key (converted to pkcs#8)
 170          */
 171         public static function decode($importer, $xml) {
 172
 173                 $public = false;
 174                 $basedom = parse_xml_string($xml);
 175
 176                 if (!is_object($basedom))
 177                         return false;
 178
 179                 $children = $basedom->children('https://joindiaspora.com/protocol');
 180
 181                 if($children->header) {
 182                         $public = true;
 183                         $author_link = str_replace('acct:','',$children->header->author_id);
 184                 } else {
 185
 186                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 187
 188                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 189                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 190
 191                         $outer_key_bundle = '';
 192                         openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
 193
 194                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 195
 196                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 197                         $outer_key = base64_decode($j_outer_key_bundle->key);
 198
 199                         $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);
 200
 201
 202                         $decrypted = pkcs5_unpad($decrypted);
 203
 204                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 205                         $idom = parse_xml_string($decrypted,false);
 206
 207                         $inner_iv = base64_decode($idom->iv);
 208                         $inner_aes_key = base64_decode($idom->aes_key);
 209
 210                         $author_link = str_replace('acct:','',$idom->author_id);
 211                 }
 212
 213                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 214
 215                 // figure out where in the DOM tree our data is hiding
 216
 217                 if($dom->provenance->data)
 218                         $base = $dom->provenance;
 219                 elseif($dom->env->data)
 220                         $base = $dom->env;
 221                 elseif($dom->data)
 222                         $base = $dom;
 223
 224                 if (!$base) {
 225                         logger('unable to locate salmon data in xml');
 226                         http_status_exit(400);
 227                 }
 228
 229
 230                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 231                 $signature = base64url_decode($base->sig);
 232
 233                 // unpack the  data
 234
 235                 // strip whitespace so our data element will return to one big base64 blob
 236                 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
 237
 238
 239                 // stash away some other stuff for later
 240
 241                 $type = $base->data[0]->attributes()->type[0];
 242                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 243                 $encoding = $base->encoding;
 244                 $alg = $base->alg;
 245
 246
 247                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 248
 249
 250                 // decode the data
 251                 $data = base64url_decode($data);
 252
 253
 254                 if($public)
 255                         $inner_decrypted = $data;
 256                 else {
 257
 258                         // Decode the encrypted blob
 259
 260                         $inner_encrypted = base64_decode($data);
 261                         $inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
 262                         $inner_decrypted = pkcs5_unpad($inner_decrypted);
 263                 }
 264
 265                 if (!$author_link) {
 266                         logger('Could not retrieve author URI.');
 267                         http_status_exit(400);
 268                 }
 269                 // Once we have the author URI, go to the web and try to find their public key
 270                 // (first this will look it up locally if it is in the fcontact cache)
 271                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 272
 273                 logger('Fetching key for '.$author_link);
 274                 $key = self::key($author_link);
 275
 276                 if (!$key) {
 277                         logger('Could not retrieve author key.');
 278                         http_status_exit(400);
 279                 }
 280
 281                 $verify = rsa_verify($signed_data,$signature,$key);
 282
 283                 if (!$verify) {
 284                         logger('Message did not verify. Discarding.');
 285                         http_status_exit(400);
 286                 }
 287
 288                 logger('Message verified.');
 289
 290                 return array('message' => (string)$inner_decrypted,
 291                                 'author' => unxmlify($author_link),
 292                                 'key' => (string)$key);
 293         }
 294
 295
 296         /**
 297          * @brief Dispatches public messages and find the fitting receivers
 298          *
 299          * @param array $msg The post that will be dispatched
 300          *
 301          * @return int The message id of the generated message, "true" or "false" if there was an error
 302          */
 303         public static function dispatch_public($msg) {
 304
 305                 $enabled = intval(get_config("system", "diaspora_enabled"));
 306                 if (!$enabled) {
 307                         logger("diaspora is disabled");
 308                         return false;
 309                 }
 310
 311                 // Use a dummy importer to import the data for the public copy
 312                 $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 313                 $message_id = self::dispatch($importer,$msg);
 314
 315                 // Now distribute it to the followers
 316                 $r = q("SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 317                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 318                         AND NOT `account_expired` AND NOT `account_removed`",
 319                         dbesc(NETWORK_DIASPORA),
 320                         dbesc($msg["author"])
 321                 );
 322                 if($r) {
 323                         foreach($r as $rr) {
 324                                 logger("delivering to: ".$rr["username"]);
 325                                 self::dispatch($rr,$msg);
 326                         }
 327                 } else
 328                         logger("No subscribers for ".$msg["author"]." ".print_r($msg, true));
 329
 330                 return $message_id;
 331         }
 332
 333         /**
 334          * @brief Dispatches the different message types to the different functions
 335          *
 336          * @param array $importer Array of the importer user
 337          * @param array $msg The post that will be dispatched
 338          *
 339          * @return int The message id of the generated message, "true" or "false" if there was an error
 340          */
 341         public static function dispatch($importer, $msg) {
 342
 343                 // The sender is the handle of the contact that sent the message.
 344                 // This will often be different with relayed messages (for example "like" and "comment")
 345                 $sender = $msg["author"];
 346
 347                 if (!diaspora::valid_posting($msg, $fields)) {
 348                         logger("Invalid posting");
 349                         return false;
 350                 }
 351
 352                 $type = $fields->getName();
 353
 354                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 355
 356                 switch ($type) {
 357                         case "account_deletion":
 358                                 return self::receive_account_deletion($importer, $fields);
 359
 360                         case "comment":
 361                                 return self::receive_comment($importer, $sender, $fields, $msg["message"]);
 362
 363                         case "contact":
 364                                 return self::receive_contact_request($importer, $fields);
 365
 366                         case "conversation":
 367                                 return self::receive_conversation($importer, $msg, $fields);
 368
 369                         case "like":
 370                                 return self::receive_like($importer, $sender, $fields);
 371
 372                         case "message":
 373                                 return self::receive_message($importer, $fields);
 374
 375                         case "participation": // Not implemented
 376                                 return self::receive_participation($importer, $fields);
 377
 378                         case "photo": // Not implemented
 379                                 return self::receive_photo($importer, $fields);
 380
 381                         case "poll_participation": // Not implemented
 382                                 return self::receive_poll_participation($importer, $fields);
 383
 384                         case "profile":
 385                                 return self::receive_profile($importer, $fields);
 386
 387                         case "reshare":
 388                                 return self::receive_reshare($importer, $fields, $msg["message"]);
 389
 390                         case "retraction":
 391                                 return self::receive_retraction($importer, $sender, $fields);
 392
 393                         case "status_message":
 394                                 return self::receive_status_message($importer, $fields, $msg["message"]);
 395
 396                         default:
 397                                 logger("Unknown message type ".$type);
 398                                 return false;
 399                 }
 400
 401                 return true;
 402         }
 403
 404         /**
 405          * @brief Checks if a posting is valid and fetches the data fields.
 406          *
 407          * This function does not only check the signature.
 408          * It also does the conversion between the old and the new diaspora format.
 409          *
 410          * @param array $msg Array with the XML, the sender handle and the sender signature
 411          * @param object $fields SimpleXML object that contains the posting when it is valid
 412          *
 413          * @return bool Is the posting valid?
 414          */
 415         private function valid_posting($msg, &$fields) {
 416
 417                 $data = parse_xml_string($msg["message"], false);
 418
 419                 if (!is_object($data)) {
 420                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 421                         return false;
 422                 }
 423
 424                 $first_child = $data->getName();
 425
 426                 // Is this the new or the old version?
 427                 if ($data->getName() == "XML") {
 428                         $oldXML = true;
 429                         foreach ($data->post->children() as $child)
 430                                 $element = $child;
 431                 } else {
 432                         $oldXML = false;
 433                         $element = $data;
 434                 }
 435
 436                 $type = $element->getName();
 437                 $orig_type = $type;
 438
 439                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 440
 441                 // All retractions are handled identically from now on.
 442                 // In the new version there will only be "retraction".
 443                 if (in_array($type, array("signed_retraction", "relayable_retraction")))
 444                         $type = "retraction";
 445
 446                 if ($type == "request")
 447                         $type = "contact";
 448
 449                 $fields = new SimpleXMLElement("<".$type."/>");
 450
 451                 $signed_data = "";
 452
 453                 foreach ($element->children() AS $fieldname => $entry) {
 454                         if ($oldXML) {
 455                                 // Translation for the old XML structure
 456                                 if ($fieldname == "diaspora_handle")
 457                                         $fieldname = "author";
 458
 459                                 if ($fieldname == "participant_handles")
 460                                         $fieldname = "participants";
 461
 462                                 if (in_array($type, array("like", "participation"))) {
 463                                         if ($fieldname == "target_type")
 464                                                 $fieldname = "parent_type";
 465                                 }
 466
 467                                 if ($fieldname == "sender_handle")
 468                                         $fieldname = "author";
 469
 470                                 if ($fieldname == "recipient_handle")
 471                                         $fieldname = "recipient";
 472
 473                                 if ($fieldname == "root_diaspora_id")
 474                                         $fieldname = "root_author";
 475
 476                                 if ($type == "retraction") {
 477                                         if ($fieldname == "post_guid")
 478                                                 $fieldname = "target_guid";
 479
 480                                         if ($fieldname == "type")
 481                                                 $fieldname = "target_type";
 482                                 }
 483                         }
 484
 485                         if (($fieldname == "author_signature") AND ($entry != ""))
 486                                 $author_signature = base64_decode($entry);
 487                         elseif (($fieldname == "parent_author_signature") AND ($entry != ""))
 488                                 $parent_author_signature = base64_decode($entry);
 489                         elseif (!in_array($fieldname, array("author_signature", "parent_author_signature", "target_author_signature"))) {
 490                                 if ($signed_data != "") {
 491                                         $signed_data .= ";";
 492                                         $signed_data_parent .= ";";
 493                                 }
 494
 495                                 $signed_data .= $entry;
 496                         }
 497                         if (!in_array($fieldname, array("parent_author_signature", "target_author_signature")) OR
 498                                 ($orig_type == "relayable_retraction"))
 499                                 xml::copy($entry, $fields, $fieldname);
 500                 }
 501
 502                 // This is something that shouldn't happen at all.
 503                 if (in_array($type, array("status_message", "reshare", "profile")))
 504                         if ($msg["author"] != $fields->author) {
 505                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 506                                 return false;
 507                         }
 508
 509                 // Only some message types have signatures. So we quit here for the other types.
 510                 if (!in_array($type, array("comment", "message", "like")))
 511                         return true;
 512
 513                 // No author_signature? This is a must, so we quit.
 514                 if (!isset($author_signature)) {
 515                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 516                         return false;
 517                 }
 518
 519                 if (isset($parent_author_signature)) {
 520                         $key = self::key($msg["author"]);
 521
 522                         if (!rsa_verify($signed_data, $parent_author_signature, $key, "sha256")) {
 523                                 logger("No valid parent author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 524                                 return false;
 525                         }
 526                 }
 527
 528                 $key = self::key($fields->author);
 529
 530                 if (!rsa_verify($signed_data, $author_signature, $key, "sha256")) {
 531                         logger("No valid author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 532                         return false;
 533                 } else
 534                         return true;
 535         }
 536
 537         /**
 538          * @brief Fetches the public key for a given handle
 539          *
 540          * @param string $handle The handle
 541          *
 542          * @return string The public key
 543          */
 544         private function key($handle) {
 545                 $handle = strval($handle);
 546
 547                 logger("Fetching diaspora key for: ".$handle);
 548
 549                 $r = self::person_by_handle($handle);
 550                 if($r)
 551                         return $r["pubkey"];
 552
 553                 return "";
 554         }
 555
 556         /**
 557          * @brief Fetches data for a given handle
 558          *
 559          * @param string $handle The handle
 560          *
 561          * @return array the queried data
 562          */
 563         private function person_by_handle($handle) {
 564
 565                 $r = q("SELECT * FROM `fcontact` WHERE `network` = '%s' AND `addr` = '%s' LIMIT 1",
 566                         dbesc(NETWORK_DIASPORA),
 567                         dbesc($handle)
 568                 );
 569                 if ($r) {
 570                         $person = $r[0];
 571                         logger("In cache ".print_r($r,true), LOGGER_DEBUG);
 572
 573                         // update record occasionally so it doesn't get stale
 574                         $d = strtotime($person["updated"]." +00:00");
 575                         if ($d < strtotime("now - 14 days"))
 576                                 $update = true;
 577
 578                         if ($person["guid"] == "")
 579                                 $update = true;
 580                 }
 581
 582                 if (!$person OR $update) {
 583                         logger("create or refresh", LOGGER_DEBUG);
 584                         $r = probe_url($handle, PROBE_DIASPORA);
 585
 586                         // Note that Friendica contacts will return a "Diaspora person"
 587                         // if Diaspora connectivity is enabled on their server
 588                         if ($r AND ($r["network"] === NETWORK_DIASPORA)) {
 589                                 self::add_fcontact($r, $update);
 590                                 $person = $r;
 591                         }
 592                 }
 593                 return $person;
 594         }
 595
 596         /**
 597          * @brief Updates the fcontact table
 598          *
 599          * @param array $arr The fcontact data
 600          * @param bool $update Update or insert?
 601          *
 602          * @return string The id of the fcontact entry
 603          */
 604         private function add_fcontact($arr, $update = false) {
 605
 606                 if($update) {
 607                         $r = q("UPDATE `fcontact` SET
 608                                         `name` = '%s',
 609                                         `photo` = '%s',
 610                                         `request` = '%s',
 611                                         `nick` = '%s',
 612                                         `addr` = '%s',
 613                                         `guid` = '%s',
 614                                         `batch` = '%s',
 615                                         `notify` = '%s',
 616                                         `poll` = '%s',
 617                                         `confirm` = '%s',
 618                                         `alias` = '%s',
 619                                         `pubkey` = '%s',
 620                                         `updated` = '%s'
 621                                 WHERE `url` = '%s' AND `network` = '%s'",
 622                                         dbesc($arr["name"]),
 623                                         dbesc($arr["photo"]),
 624                                         dbesc($arr["request"]),
 625                                         dbesc($arr["nick"]),
 626                                         dbesc(strtolower($arr["addr"])),
 627                                         dbesc($arr["guid"]),
 628                                         dbesc($arr["batch"]),
 629                                         dbesc($arr["notify"]),
 630                                         dbesc($arr["poll"]),
 631                                         dbesc($arr["confirm"]),
 632                                         dbesc($arr["alias"]),
 633                                         dbesc($arr["pubkey"]),
 634                                         dbesc(datetime_convert()),
 635                                         dbesc($arr["url"]),
 636                                         dbesc($arr["network"])
 637                                 );
 638                 } else {
 639                         $r = q("INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`, `guid`,
 640                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 641                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 642                                         dbesc($arr["url"]),
 643                                         dbesc($arr["name"]),
 644                                         dbesc($arr["photo"]),
 645                                         dbesc($arr["request"]),
 646                                         dbesc($arr["nick"]),
 647                                         dbesc($arr["addr"]),
 648                                         dbesc($arr["guid"]),
 649                                         dbesc($arr["batch"]),
 650                                         dbesc($arr["notify"]),
 651                                         dbesc($arr["poll"]),
 652                                         dbesc($arr["confirm"]),
 653                                         dbesc($arr["network"]),
 654                                         dbesc($arr["alias"]),
 655                                         dbesc($arr["pubkey"]),
 656                                         dbesc(datetime_convert())
 657                                 );
 658                 }
 659
 660                 return $r;
 661         }
 662
 663         /**
 664          * @brief get a handle (user@domain.tld) from a given contact id or gcontact id
 665          *
 666          * @param int $contact_id The id in the contact table
 667          * @param int $gcontact_id The id in the gcontact table
 668          *
 669          * @return string the handle
 670          */
 671         public static function handle_from_contact($contact_id, $gcontact_id = 0) {
 672                 $handle = False;
 673
 674                 logger("contact id is ".$contact_id." - gcontact id is ".$gcontact_id, LOGGER_DEBUG);
 675
 676                 if ($gcontact_id != 0) {
 677                         $r = q("SELECT `addr` FROM `gcontact` WHERE `id` = %d AND `addr` != ''",
 678                                 intval($gcontact_id));
 679                         if ($r)
 680                                 return strtolower($r[0]["addr"]);
 681                 }
 682
 683                 $r = q("SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 684                         intval($contact_id));
 685                 if ($r) {
 686                         $contact = $r[0];
 687
 688                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 689
 690                         if($contact['addr'] != "")
 691                                 $handle = $contact['addr'];
 692                         else {
 693                                 $baseurl_start = strpos($contact['url'],'://') + 3;
 694                                 $baseurl_length = strpos($contact['url'],'/profile') - $baseurl_start; // allows installations in a subdirectory--not sure how Diaspora will handle
 695                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 696                                 $handle = $contact['nick'].'@'.$baseurl;
 697                         }
 698                 }
 699
 700                 return strtolower($handle);
 701         }
 702
 703         /**
 704          * @brief Get a contact id for a given handle
 705          *
 706          * @param int $uid The user id
 707          * @param string $handle The handle in the format user@domain.tld
 708          *
 709          * @return The contact id
 710          */
 711         private function contact_by_handle($uid, $handle) {
 712                 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
 713                         intval($uid),
 714                         dbesc($handle)
 715                 );
 716
 717                 if ($r)
 718                         return $r[0];
 719
 720                 $handle_parts = explode("@", $handle);
 721                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
 722                 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
 723                         dbesc(NETWORK_DFRN),
 724                         intval($uid),
 725                         dbesc($nurl_sql)
 726                 );
 727                 if($r)
 728                         return $r[0];
 729
 730                 return false;
 731         }
 732
 733         /**
 734          * @brief Check if posting is allowed for this contact
 735          *
 736          * @param array $importer Array of the importer user
 737          * @param array $contact The contact that is checked
 738          * @param bool $is_comment Is the check for a comment?
 739          *
 740          * @return bool is the contact allowed to post?
 741          */
 742         private function post_allow($importer, $contact, $is_comment = false) {
 743
 744                 // perhaps we were already sharing with this person. Now they're sharing with us.
 745                 // That makes us friends.
 746                 // Normally this should have handled by getting a request - but this could get lost
 747                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
 748                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
 749                                 intval(CONTACT_IS_FRIEND),
 750                                 intval($contact["id"]),
 751                                 intval($importer["uid"])
 752                         );
 753                         $contact["rel"] = CONTACT_IS_FRIEND;
 754                         logger("defining user ".$contact["nick"]." as friend");
 755                 }
 756
 757                 if(($contact["blocked"]) || ($contact["readonly"]) || ($contact["archive"]))
 758                         return false;
 759                 if($contact["rel"] == CONTACT_IS_SHARING || $contact["rel"] == CONTACT_IS_FRIEND)
 760                         return true;
 761                 if($contact["rel"] == CONTACT_IS_FOLLOWER)
 762                         if(($importer["page-flags"] == PAGE_COMMUNITY) OR $is_comment)
 763                                 return true;
 764
 765                 // Messages for the global users are always accepted
 766                 if ($importer["uid"] == 0)
 767                         return true;
 768
 769                 return false;
 770         }
 771
 772         /**
 773          * @brief Fetches the contact id for a handle and checks if posting is allowed
 774          *
 775          * @param array $importer Array of the importer user
 776          * @param string $handle The checked handle in the format user@domain.tld
 777          * @param bool $is_comment Is the check for a comment?
 778          *
 779          * @return array The contact data
 780          */
 781         private function allowed_contact_by_handle($importer, $handle, $is_comment = false) {
 782                 $contact = self::contact_by_handle($importer["uid"], $handle);
 783                 if (!$contact) {
 784                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
 785                         return false;
 786                 }
 787
 788                 if (!self::post_allow($importer, $contact, $is_comment)) {
 789                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
 790                         return false;
 791                 }
 792                 return $contact;
 793         }
 794
 795         /**
 796          * @brief Does the message already exists on the system?
 797          *
 798          * @param int $uid The user id
 799          * @param string $guid The guid of the message
 800          *
 801          * @return int|bool message id if the message already was stored into the system - or false.
 802          */
 803         private function message_exists($uid, $guid) {
 804                 $r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 805                         intval($uid),
 806                         dbesc($guid)
 807                 );
 808
 809                 if($r) {
 810                         logger("message ".$guid." already exists for user ".$uid);
 811                         return $r[0]["id"];
 812                 }
 813
 814                 return false;
 815         }
 816
 817         /**
 818          * @brief Checks for links to posts in a message
 819          *
 820          * @param array $item The item array
 821          */
 822         private function fetch_guid($item) {
 823                 preg_replace_callback("&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
 824                         function ($match) use ($item){
 825                                 return(self::fetch_guid_sub($match, $item));
 826                         },$item["body"]);
 827         }
 828
 829         /**
 830          * @brief sub function of "fetch_guid" which checks for links in messages
 831          *
 832          * @param array $match array containing a link that has to be checked for a message link
 833          * @param array $item The item array
 834          */
 835         private function fetch_guid_sub($match, $item) {
 836                 if (!self::store_by_guid($match[1], $item["author-link"]))
 837                         self::store_by_guid($match[1], $item["owner-link"]);
 838         }
 839
 840         /**
 841          * @brief Fetches an item with a given guid from a given server
 842          *
 843          * @param string $guid the message guid
 844          * @param string $server The server address
 845          * @param int $uid The user id of the user
 846          *
 847          * @return int the message id of the stored message or false
 848          */
 849         private function store_by_guid($guid, $server, $uid = 0) {
 850                 $serverparts = parse_url($server);
 851                 $server = $serverparts["scheme"]."://".$serverparts["host"];
 852
 853                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
 854
 855                 $msg = self::message($guid, $server);
 856
 857                 if (!$msg)
 858                         return false;
 859
 860                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
 861
 862                 // Now call the dispatcher
 863                 return self::dispatch_public($msg);
 864         }
 865
 866         /**
 867          * @brief Fetches a message from a server
 868          *
 869          * @param string $guid message guid
 870          * @param string $server The url of the server
 871          * @param int $level Endless loop prevention
 872          *
 873          * @return array
 874          *      'message' => The message XML
 875          *      'author' => The author handle
 876          *      'key' => The public key of the author
 877          */
 878         private function message($guid, $server, $level = 0) {
 879
 880                 if ($level > 5)
 881                         return false;
 882
 883                 // This will work for new Diaspora servers and Friendica servers from 3.5
 884                 $source_url = $server."/fetch/post/".$guid;
 885                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
 886
 887                 $envelope = fetch_url($source_url);
 888                 if($envelope) {
 889                         logger("Envelope was fetched.", LOGGER_DEBUG);
 890                         $x = self::verify_magic_envelope($envelope);
 891                         if (!$x)
 892                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
 893                         else
 894                                 logger("Envelope was verified.", LOGGER_DEBUG);
 895                 } else
 896                         $x = false;
 897
 898                 // This will work for older Diaspora and Friendica servers
 899                 if (!$x) {
 900                         $source_url = $server."/p/".$guid.".xml";
 901                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
 902
 903                         $x = fetch_url($source_url);
 904                         if(!$x)
 905                                 return false;
 906                 }
 907
 908                 $source_xml = parse_xml_string($x, false);
 909
 910                 if (!is_object($source_xml))
 911                         return false;
 912
 913                 if ($source_xml->post->reshare) {
 914                         // Reshare of a reshare - old Diaspora version
 915                         logger("Message is a reshare", LOGGER_DEBUG);
 916                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
 917                 } elseif ($source_xml->getName() == "reshare") {
 918                         // Reshare of a reshare - new Diaspora version
 919                         logger("Message is a new reshare", LOGGER_DEBUG);
 920                         return self::message($source_xml->root_guid, $server, ++$level);
 921                 }
 922
 923                 $author = "";
 924
 925                 // Fetch the author - for the old and the new Diaspora version
 926                 if ($source_xml->post->status_message->diaspora_handle)
 927                         $author = (string)$source_xml->post->status_message->diaspora_handle;
 928                 elseif ($source_xml->author AND ($source_xml->getName() == "status_message"))
 929                         $author = (string)$source_xml->author;
 930
 931                 // If this isn't a "status_message" then quit
 932                 if (!$author) {
 933                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
 934                         return false;
 935                 }
 936
 937                 $msg = array("message" => $x, "author" => $author);
 938
 939                 $msg["key"] = self::key($msg["author"]);
 940
 941                 return $msg;
 942         }
 943
 944         /**
 945          * @brief Fetches the item record of a given guid
 946          *
 947          * @param int $uid The user id
 948          * @param string $guid message guid
 949          * @param string $author The handle of the item
 950          * @param array $contact The contact of the item owner
 951          *
 952          * @return array the item record
 953          */
 954         private function parent_item($uid, $guid, $author, $contact) {
 955                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 956                                 `author-name`, `author-link`, `author-avatar`,
 957                                 `owner-name`, `owner-link`, `owner-avatar`
 958                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 959                         intval($uid), dbesc($guid));
 960
 961                 if(!$r) {
 962                         $result = self::store_by_guid($guid, $contact["url"], $uid);
 963
 964                         if (!$result) {
 965                                 $person = self::person_by_handle($author);
 966                                 $result = self::store_by_guid($guid, $person["url"], $uid);
 967                         }
 968
 969                         if ($result) {
 970                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
 971
 972                                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
 973                                                 `author-name`, `author-link`, `author-avatar`,
 974                                                 `owner-name`, `owner-link`, `owner-avatar`
 975                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 976                                         intval($uid), dbesc($guid));
 977                         }
 978                 }
 979
 980                 if (!$r) {
 981                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
 982                         return false;
 983                 } else {
 984                         logger("parent item found: parent: ".$guid." - user: ".$uid);
 985                         return $r[0];
 986                 }
 987         }
 988
 989         /**
 990          * @brief returns contact details
 991          *
 992          * @param array $contact The default contact if the person isn't found
 993          * @param array $person The record of the person
 994          * @param int $uid The user id
 995          *
 996          * @return array
 997          *      'cid' => contact id
 998          *      'network' => network type
 999          */
1000         private function author_contact_by_url($contact, $person, $uid) {
1001
1002                 $r = q("SELECT `id`, `network`, `url` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
1003                         dbesc(normalise_link($person["url"])), intval($uid));
1004                 if ($r) {
1005                         $cid = $r[0]["id"];
1006                         $network = $r[0]["network"];
1007
1008                         // We are receiving content from a user that is about to be terminated
1009                         // This means the user is vital, so we remove a possible termination date.
1010                         unmark_for_death($contact);
1011                 } else {
1012                         $cid = $contact["id"];
1013                         $network = NETWORK_DIASPORA;
1014                 }
1015
1016                 return array("cid" => $cid, "network" => $network);
1017         }
1018
1019         /**
1020          * @brief Is the profile a hubzilla profile?
1021          *
1022          * @param string $url The profile link
1023          *
1024          * @return bool is it a hubzilla server?
1025          */
1026         public static function is_redmatrix($url) {
1027                 return(strstr($url, "/channel/"));
1028         }
1029
1030         /**
1031          * @brief Generate a post link with a given handle and message guid
1032          *
1033          * @param string $addr The user handle
1034          * @param string $guid message guid
1035          *
1036          * @return string the post link
1037          */
1038         private function plink($addr, $guid) {
1039                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
1040
1041                 // Fallback
1042                 if (!$r)
1043                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1044
1045                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
1046                 // So we try another way as well.
1047                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
1048                 if ($s)
1049                         $r[0]["network"] = $s[0]["network"];
1050
1051                 if ($r[0]["network"] == NETWORK_DFRN)
1052                         return(str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/"));
1053
1054                 if (self::is_redmatrix($r[0]["url"]))
1055                         return $r[0]["url"]."/?f=&mid=".$guid;
1056
1057                 return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1058         }
1059
1060         /**
1061          * @brief Processes an account deletion
1062          *
1063          * @param array $importer Array of the importer user
1064          * @param object $data The message object
1065          *
1066          * @return bool Success
1067          */
1068         private function receive_account_deletion($importer, $data) {
1069
1070                 /// @todo Account deletion should remove the contact from the global contacts as well
1071
1072                 $author = notags(unxmlify($data->author));
1073
1074                 $contact = self::contact_by_handle($importer["uid"], $author);
1075                 if (!$contact) {
1076                         logger("cannot find contact for author: ".$author);
1077                         return false;
1078                 }
1079
1080                 // We now remove the contact
1081                 contact_remove($contact["id"]);
1082                 return true;
1083         }
1084
1085         /**
1086          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1087          *
1088          * @param string $author Author handle
1089          * @param string $guid Message guid
1090          *
1091          * @return string The constructed uri or the one from our database
1092          */
1093         private function get_uri_from_guid($author, $guid) {
1094
1095                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1096                 if ($r)
1097                         return $r[0]["uri"];
1098                 else
1099                         return $author.":".$guid;
1100         }
1101
1102         /**
1103          * @brief Processes an incoming comment
1104          *
1105          * @param array $importer Array of the importer user
1106          * @param string $sender The sender of the message
1107          * @param object $data The message object
1108          * @param string $xml The original XML of the message
1109          *
1110          * @return int The message id of the generated comment or "false" if there was an error
1111          */
1112         private function receive_comment($importer, $sender, $data, $xml) {
1113                 $guid = notags(unxmlify($data->guid));
1114                 $parent_guid = notags(unxmlify($data->parent_guid));
1115                 $text = unxmlify($data->text);
1116                 $author = notags(unxmlify($data->author));
1117
1118                 if (isset($data->created_at))
1119                         $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1120                 else
1121                         $created_at = datetime_convert();
1122
1123                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1124                 if (!$contact)
1125                         return false;
1126
1127                 $message_id = self::message_exists($importer["uid"], $guid);
1128                 if ($message_id)
1129                         return $message_id;
1130
1131                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1132                 if (!$parent_item)
1133                         return false;
1134
1135                 $person = self::person_by_handle($author);
1136                 if (!is_array($person)) {
1137                         logger("unable to find author details");
1138                         return false;
1139                 }
1140
1141                 // Fetch the contact id - if we know this contact
1142                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1143
1144                 $datarray = array();
1145
1146                 $datarray["uid"] = $importer["uid"];
1147                 $datarray["contact-id"] = $author_contact["cid"];
1148                 $datarray["network"]  = $author_contact["network"];
1149
1150                 $datarray["author-name"] = $person["name"];
1151                 $datarray["author-link"] = $person["url"];
1152                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1153
1154                 $datarray["owner-name"] = $contact["name"];
1155                 $datarray["owner-link"] = $contact["url"];
1156                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1157
1158                 $datarray["guid"] = $guid;
1159                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1160
1161                 $datarray["type"] = "remote-comment";
1162                 $datarray["verb"] = ACTIVITY_POST;
1163                 $datarray["gravity"] = GRAVITY_COMMENT;
1164                 $datarray["parent-uri"] = $parent_item["uri"];
1165
1166                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1167                 $datarray["object"] = $xml;
1168
1169                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1170
1171                 $datarray["body"] = diaspora2bb($text);
1172
1173                 self::fetch_guid($datarray);
1174
1175                 $message_id = item_store($datarray);
1176
1177                 if ($message_id)
1178                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1179
1180                 // If we are the origin of the parent we store the original data and notify our followers
1181                 if($message_id AND $parent_item["origin"]) {
1182
1183                         // Formerly we stored the signed text, the signature and the author in different fields.
1184                         // We now store the raw data so that we are more flexible.
1185                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1186                                 intval($message_id),
1187                                 dbesc(json_encode($data))
1188                         );
1189
1190                         // notify others
1191                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1192                 }
1193
1194                 return $message_id;
1195         }
1196
1197         /**
1198          * @brief processes and stores private messages
1199          *
1200          * @param array $importer Array of the importer user
1201          * @param array $contact The contact of the message
1202          * @param object $data The message object
1203          * @param array $msg Array of the processed message, author handle and key
1204          * @param object $mesg The private message
1205          * @param array $conversation The conversation record to which this message belongs
1206          *
1207          * @return bool "true" if it was successful
1208          */
1209         private function receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation) {
1210                 $guid = notags(unxmlify($data->guid));
1211                 $subject = notags(unxmlify($data->subject));
1212                 $author = notags(unxmlify($data->author));
1213
1214                 $reply = 0;
1215
1216                 $msg_guid = notags(unxmlify($mesg->guid));
1217                 $msg_parent_guid = notags(unxmlify($mesg->parent_guid));
1218                 $msg_parent_author_signature = notags(unxmlify($mesg->parent_author_signature));
1219                 $msg_author_signature = notags(unxmlify($mesg->author_signature));
1220                 $msg_text = unxmlify($mesg->text);
1221                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1222
1223                 // "diaspora_handle" is the element name from the old version
1224                 // "author" is the element name from the new version
1225                 if ($mesg->author)
1226                         $msg_author = notags(unxmlify($mesg->author));
1227                 elseif ($mesg->diaspora_handle)
1228                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1229                 else
1230                         return false;
1231
1232                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1233
1234                 if($msg_conversation_guid != $guid) {
1235                         logger("message conversation guid does not belong to the current conversation.");
1236                         return false;
1237                 }
1238
1239                 $body = diaspora2bb($msg_text);
1240                 $message_uri = $msg_author.":".$msg_guid;
1241
1242                 $author_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1243
1244                 $author_signature = base64_decode($msg_author_signature);
1245
1246                 if(strcasecmp($msg_author,$msg["author"]) == 0) {
1247                         $person = $contact;
1248                         $key = $msg["key"];
1249                 } else {
1250                         $person = self::person_by_handle($msg_author);
1251
1252                         if (is_array($person) && x($person, "pubkey"))
1253                                 $key = $person["pubkey"];
1254                         else {
1255                                 logger("unable to find author details");
1256                                         return false;
1257                         }
1258                 }
1259
1260                 if (!rsa_verify($author_signed_data, $author_signature, $key, "sha256")) {
1261                         logger("verification failed.");
1262                         return false;
1263                 }
1264
1265                 if($msg_parent_author_signature) {
1266                         $owner_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1267
1268                         $parent_author_signature = base64_decode($msg_parent_author_signature);
1269
1270                         $key = $msg["key"];
1271
1272                         if (!rsa_verify($owner_signed_data, $parent_author_signature, $key, "sha256")) {
1273                                 logger("owner verification failed.");
1274                                 return false;
1275                         }
1276                 }
1277
1278                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' LIMIT 1",
1279                         dbesc($message_uri)
1280                 );
1281                 if($r) {
1282                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1283                         return false;
1284                 }
1285
1286                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1287                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1288                         intval($importer["uid"]),
1289                         dbesc($msg_guid),
1290                         intval($conversation["id"]),
1291                         dbesc($person["name"]),
1292                         dbesc($person["photo"]),
1293                         dbesc($person["url"]),
1294                         intval($contact["id"]),
1295                         dbesc($subject),
1296                         dbesc($body),
1297                         0,
1298                         0,
1299                         dbesc($message_uri),
1300                         dbesc($author.":".$guid),
1301                         dbesc($msg_created_at)
1302                 );
1303
1304                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1305                         dbesc(datetime_convert()),
1306                         intval($conversation["id"])
1307                 );
1308
1309                 notification(array(
1310                         "type" => NOTIFY_MAIL,
1311                         "notify_flags" => $importer["notify-flags"],
1312                         "language" => $importer["language"],
1313                         "to_name" => $importer["username"],
1314                         "to_email" => $importer["email"],
1315                         "uid" =>$importer["uid"],
1316                         "item" => array("subject" => $subject, "body" => $body),
1317                         "source_name" => $person["name"],
1318                         "source_link" => $person["url"],
1319                         "source_photo" => $person["thumb"],
1320                         "verb" => ACTIVITY_POST,
1321                         "otype" => "mail"
1322                 ));
1323                 return true;
1324         }
1325
1326         /**
1327          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1328          *
1329          * @param array $importer Array of the importer user
1330          * @param array $msg Array of the processed message, author handle and key
1331          * @param object $data The message object
1332          *
1333          * @return bool Success
1334          */
1335         private function receive_conversation($importer, $msg, $data) {
1336                 $guid = notags(unxmlify($data->guid));
1337                 $subject = notags(unxmlify($data->subject));
1338                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1339                 $author = notags(unxmlify($data->author));
1340                 $participants = notags(unxmlify($data->participants));
1341
1342                 $messages = $data->message;
1343
1344                 if (!count($messages)) {
1345                         logger("empty conversation");
1346                         return false;
1347                 }
1348
1349                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1350                 if (!$contact)
1351                         return false;
1352
1353                 $conversation = null;
1354
1355                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1356                         intval($importer["uid"]),
1357                         dbesc($guid)
1358                 );
1359                 if($c)
1360                         $conversation = $c[0];
1361                 else {
1362                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1363                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1364                                 intval($importer["uid"]),
1365                                 dbesc($guid),
1366                                 dbesc($author),
1367                                 dbesc($created_at),
1368                                 dbesc(datetime_convert()),
1369                                 dbesc($subject),
1370                                 dbesc($participants)
1371                         );
1372                         if($r)
1373                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1374                                         intval($importer["uid"]),
1375                                         dbesc($guid)
1376                                 );
1377
1378                         if($c)
1379                                 $conversation = $c[0];
1380                 }
1381                 if (!$conversation) {
1382                         logger("unable to create conversation.");
1383                         return;
1384                 }
1385
1386                 foreach($messages as $mesg)
1387                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation);
1388
1389                 return true;
1390         }
1391
1392         /**
1393          * @brief Creates the body for a "like" message
1394          *
1395          * @param array $contact The contact that send us the "like"
1396          * @param array $parent_item The item array of the parent item
1397          * @param string $guid message guid
1398          *
1399          * @return string the body
1400          */
1401         private function construct_like_body($contact, $parent_item, $guid) {
1402                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1403
1404                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1405                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1406                 $plink = "[url=".App::get_baseurl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1407
1408                 return sprintf($bodyverb, $ulink, $alink, $plink);
1409         }
1410
1411         /**
1412          * @brief Creates a XML object for a "like"
1413          *
1414          * @param array $importer Array of the importer user
1415          * @param array $parent_item The item array of the parent item
1416          *
1417          * @return string The XML
1418          */
1419         private function construct_like_object($importer, $parent_item) {
1420                 $objtype = ACTIVITY_OBJ_NOTE;
1421                 $link = '<link rel="alternate" type="text/html" href="'.App::get_baseurl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1422                 $parent_body = $parent_item["body"];
1423
1424                 $xmldata = array("object" => array("type" => $objtype,
1425                                                 "local" => "1",
1426                                                 "id" => $parent_item["uri"],
1427                                                 "link" => $link,
1428                                                 "title" => "",
1429                                                 "content" => $parent_body));
1430
1431                 return xml::from_array($xmldata, $xml, true);
1432         }
1433
1434         /**
1435          * @brief Processes "like" messages
1436          *
1437          * @param array $importer Array of the importer user
1438          * @param string $sender The sender of the message
1439          * @param object $data The message object
1440          *
1441          * @return int The message id of the generated like or "false" if there was an error
1442          */
1443         private function receive_like($importer, $sender, $data) {
1444                 $positive = notags(unxmlify($data->positive));
1445                 $guid = notags(unxmlify($data->guid));
1446                 $parent_type = notags(unxmlify($data->parent_type));
1447                 $parent_guid = notags(unxmlify($data->parent_guid));
1448                 $author = notags(unxmlify($data->author));
1449
1450                 // likes on comments aren't supported by Diaspora - only on posts
1451                 // But maybe this will be supported in the future, so we will accept it.
1452                 if (!in_array($parent_type, array("Post", "Comment")))
1453                         return false;
1454
1455                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1456                 if (!$contact)
1457                         return false;
1458
1459                 $message_id = self::message_exists($importer["uid"], $guid);
1460                 if ($message_id)
1461                         return $message_id;
1462
1463                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1464                 if (!$parent_item)
1465                         return false;
1466
1467                 $person = self::person_by_handle($author);
1468                 if (!is_array($person)) {
1469                         logger("unable to find author details");
1470                         return false;
1471                 }
1472
1473                 // Fetch the contact id - if we know this contact
1474                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1475
1476                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1477                 // We would accept this anyhow.
1478                 if ($positive == "true")
1479                         $verb = ACTIVITY_LIKE;
1480                 else
1481                         $verb = ACTIVITY_DISLIKE;
1482
1483                 $datarray = array();
1484
1485                 $datarray["uid"] = $importer["uid"];
1486                 $datarray["contact-id"] = $author_contact["cid"];
1487                 $datarray["network"]  = $author_contact["network"];
1488
1489                 $datarray["author-name"] = $person["name"];
1490                 $datarray["author-link"] = $person["url"];
1491                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1492
1493                 $datarray["owner-name"] = $contact["name"];
1494                 $datarray["owner-link"] = $contact["url"];
1495                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1496
1497                 $datarray["guid"] = $guid;
1498                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1499
1500                 $datarray["type"] = "activity";
1501                 $datarray["verb"] = $verb;
1502                 $datarray["gravity"] = GRAVITY_LIKE;
1503                 $datarray["parent-uri"] = $parent_item["uri"];
1504
1505                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1506                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1507
1508                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1509
1510                 $message_id = item_store($datarray);
1511
1512                 if ($message_id)
1513                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1514
1515                 // If we are the origin of the parent we store the original data and notify our followers
1516                 if($message_id AND $parent_item["origin"]) {
1517
1518                         // Formerly we stored the signed text, the signature and the author in different fields.
1519                         // We now store the raw data so that we are more flexible.
1520                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1521                                 intval($message_id),
1522                                 dbesc(json_encode($data))
1523                         );
1524
1525                         // notify others
1526                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1527                 }
1528
1529                 return $message_id;
1530         }
1531
1532         /**
1533          * @brief Processes private messages
1534          *
1535          * @param array $importer Array of the importer user
1536          * @param object $data The message object
1537          *
1538          * @return bool Success?
1539          */
1540         private function receive_message($importer, $data) {
1541                 $guid = notags(unxmlify($data->guid));
1542                 $parent_guid = notags(unxmlify($data->parent_guid));
1543                 $text = unxmlify($data->text);
1544                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1545                 $author = notags(unxmlify($data->author));
1546                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1547
1548                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1549                 if (!$contact)
1550                         return false;
1551
1552                 $conversation = null;
1553
1554                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1555                         intval($importer["uid"]),
1556                         dbesc($conversation_guid)
1557                 );
1558                 if($c)
1559                         $conversation = $c[0];
1560                 else {
1561                         logger("conversation not available.");
1562                         return false;
1563                 }
1564
1565                 $reply = 0;
1566
1567                 $body = diaspora2bb($text);
1568                 $message_uri = $author.":".$guid;
1569
1570                 $person = self::person_by_handle($author);
1571                 if (!$person) {
1572                         logger("unable to find author details");
1573                         return false;
1574                 }
1575
1576                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
1577                         dbesc($message_uri),
1578                         intval($importer["uid"])
1579                 );
1580                 if($r) {
1581                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1582                         return false;
1583                 }
1584
1585                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1586                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1587                         intval($importer["uid"]),
1588                         dbesc($guid),
1589                         intval($conversation["id"]),
1590                         dbesc($person["name"]),
1591                         dbesc($person["photo"]),
1592                         dbesc($person["url"]),
1593                         intval($contact["id"]),
1594                         dbesc($conversation["subject"]),
1595                         dbesc($body),
1596                         0,
1597                         1,
1598                         dbesc($message_uri),
1599                         dbesc($author.":".$parent_guid),
1600                         dbesc($created_at)
1601                 );
1602
1603                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1604                         dbesc(datetime_convert()),
1605                         intval($conversation["id"])
1606                 );
1607
1608                 return true;
1609         }
1610
1611         /**
1612          * @brief Processes participations - unsupported by now
1613          *
1614          * @param array $importer Array of the importer user
1615          * @param object $data The message object
1616          *
1617          * @return bool always true
1618          */
1619         private function receive_participation($importer, $data) {
1620                 // I'm not sure if we can fully support this message type
1621                 return true;
1622         }
1623
1624         /**
1625          * @brief Processes photos - unneeded
1626          *
1627          * @param array $importer Array of the importer user
1628          * @param object $data The message object
1629          *
1630          * @return bool always true
1631          */
1632         private function receive_photo($importer, $data) {
1633                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
1634                 return true;
1635         }
1636
1637         /**
1638          * @brief Processes poll participations - unssupported
1639          *
1640          * @param array $importer Array of the importer user
1641          * @param object $data The message object
1642          *
1643          * @return bool always true
1644          */
1645         private function receive_poll_participation($importer, $data) {
1646                 // We don't support polls by now
1647                 return true;
1648         }
1649
1650         /**
1651          * @brief Processes incoming profile updates
1652          *
1653          * @param array $importer Array of the importer user
1654          * @param object $data The message object
1655          *
1656          * @return bool Success
1657          */
1658         private function receive_profile($importer, $data) {
1659                 $author = strtolower(notags(unxmlify($data->author)));
1660
1661                 $contact = self::contact_by_handle($importer["uid"], $author);
1662                 if (!$contact)
1663                         return false;
1664
1665                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
1666                 $image_url = unxmlify($data->image_url);
1667                 $birthday = unxmlify($data->birthday);
1668                 $location = diaspora2bb(unxmlify($data->location));
1669                 $about = diaspora2bb(unxmlify($data->bio));
1670                 $gender = unxmlify($data->gender);
1671                 $searchable = (unxmlify($data->searchable) == "true");
1672                 $nsfw = (unxmlify($data->nsfw) == "true");
1673                 $tags = unxmlify($data->tag_string);
1674
1675                 $tags = explode("#", $tags);
1676
1677                 $keywords = array();
1678                 foreach ($tags as $tag) {
1679                         $tag = trim(strtolower($tag));
1680                         if ($tag != "")
1681                                 $keywords[] = $tag;
1682                 }
1683
1684                 $keywords = implode(", ", $keywords);
1685
1686                 $handle_parts = explode("@", $author);
1687                 $nick = $handle_parts[0];
1688
1689                 if($name === "")
1690                         $name = $handle_parts[0];
1691
1692                 if( preg_match("|^https?://|", $image_url) === 0)
1693                         $image_url = "http://".$handle_parts[1].$image_url;
1694
1695                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
1696
1697                 // Generic birthday. We don't know the timezone. The year is irrelevant.
1698
1699                 $birthday = str_replace("1000", "1901", $birthday);
1700
1701                 if ($birthday != "")
1702                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
1703
1704                 // this is to prevent multiple birthday notifications in a single year
1705                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
1706
1707                 if(substr($birthday,5) === substr($contact["bd"],5))
1708                         $birthday = $contact["bd"];
1709
1710                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
1711                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
1712                         dbesc($name),
1713                         dbesc($nick),
1714                         dbesc($author),
1715                         dbesc(datetime_convert()),
1716                         dbesc($birthday),
1717                         dbesc($location),
1718                         dbesc($about),
1719                         dbesc($keywords),
1720                         dbesc($gender),
1721                         intval($contact["id"]),
1722                         intval($importer["uid"])
1723                 );
1724
1725                 if ($searchable) {
1726                         poco_check($contact["url"], $name, NETWORK_DIASPORA, $image_url, $about, $location, $gender, $keywords, "",
1727                                 datetime_convert(), 2, $contact["id"], $importer["uid"]);
1728                 }
1729
1730                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
1731                                         "photo" => $image_url, "name" => $name, "location" => $location,
1732                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
1733                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
1734                                         "hide" => !$searchable, "nsfw" => $nsfw);
1735
1736                 update_gcontact($gcontact);
1737
1738                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
1739
1740                 return true;
1741         }
1742
1743         /**
1744          * @brief Processes incoming friend requests
1745          *
1746          * @param array $importer Array of the importer user
1747          * @param array $contact The contact that send the request
1748          */
1749         private function receive_request_make_friend($importer, $contact) {
1750
1751                 $a = get_app();
1752
1753                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1754                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
1755                                 intval(CONTACT_IS_FRIEND),
1756                                 intval($contact["id"]),
1757                                 intval($importer["uid"])
1758                         );
1759                 }
1760                 // send notification
1761
1762                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
1763                         intval($importer["uid"])
1764                 );
1765
1766                 if($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(get_pconfig($importer["uid"], "system", "post_newfriend"))) {
1767
1768                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
1769                                 intval($importer["uid"])
1770                         );
1771
1772                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
1773
1774                         if($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
1775
1776                                 $arr = array();
1777                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
1778                                 $arr["uid"] = $importer["uid"];
1779                                 $arr["contact-id"] = $self[0]["id"];
1780                                 $arr["wall"] = 1;
1781                                 $arr["type"] = 'wall';
1782                                 $arr["gravity"] = 0;
1783                                 $arr["origin"] = 1;
1784                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
1785                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
1786                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
1787                                 $arr["verb"] = ACTIVITY_FRIEND;
1788                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
1789
1790                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
1791                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1792                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
1793                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
1794
1795                                 $arr["object"] = self::construct_new_friend_object($contact);
1796
1797                                 $arr["last-child"] = 1;
1798
1799                                 $arr["allow_cid"] = $user[0]["allow_cid"];
1800                                 $arr["allow_gid"] = $user[0]["allow_gid"];
1801                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
1802                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
1803
1804                                 $i = item_store($arr);
1805                                 if($i)
1806                                         proc_run(PRIORITY_HIGH, "include/notifier.php", "activity", $i);
1807                         }
1808                 }
1809         }
1810
1811         /**
1812          * @brief Creates a XML object for a "new friend" message
1813          *
1814          * @param array $contact Array of the contact
1815          *
1816          * @return string The XML
1817          */
1818         private function construct_new_friend_object($contact) {
1819                 $objtype = ACTIVITY_OBJ_PERSON;
1820                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
1821                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
1822
1823                 $xmldata = array("object" => array("type" => $objtype,
1824                                                 "title" => $contact["name"],
1825                                                 "id" => $contact["url"]."/".$contact["name"],
1826                                                 "link" => $link));
1827
1828                 return xml::from_array($xmldata, $xml, true);
1829         }
1830
1831         /**
1832          * @brief Processes incoming sharing notification
1833          *
1834          * @param array $importer Array of the importer user
1835          * @param object $data The message object
1836          *
1837          * @return bool Success
1838          */
1839         private function receive_contact_request($importer, $data) {
1840                 $author = unxmlify($data->author);
1841                 $recipient = unxmlify($data->recipient);
1842
1843                 if (!$author || !$recipient)
1844                         return false;
1845
1846                 // the current protocol version doesn't know these fields
1847                 // That means that we will assume their existance
1848                 if (isset($data->following))
1849                         $following = (unxmlify($data->following) == "true");
1850                 else
1851                         $following = true;
1852
1853                 if (isset($data->sharing))
1854                         $sharing = (unxmlify($data->sharing) == "true");
1855                 else
1856                         $sharing = true;
1857
1858                 $contact = self::contact_by_handle($importer["uid"],$author);
1859
1860                 // perhaps we were already sharing with this person. Now they're sharing with us.
1861                 // That makes us friends.
1862                 if ($contact) {
1863                         if ($following AND $sharing) {
1864                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to have a bidirectional conection.", LOGGER_DEBUG);
1865                                 self::receive_request_make_friend($importer, $contact);
1866
1867                                 // refetch the contact array
1868                                 $contact = self::contact_by_handle($importer["uid"],$author);
1869
1870                                 // If we are now friends, we are sending a share message.
1871                                 // Normally we needn't to do so, but the first message could have been vanished.
1872                                 if (in_array($contact["rel"], array(CONTACT_IS_FRIEND, CONTACT_IS_FOLLOWER))) {
1873                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
1874                                         if($u) {
1875                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
1876                                                 $ret = self::send_share($u[0], $contact);
1877                                         }
1878                                 }
1879                                 return true;
1880                         } else { /// @todo Handle all possible variations of adding and retracting of permissions
1881                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to change the relationship: Following: ".$following." - sharing: ".$sharing. "(By now unsupported)", LOGGER_DEBUG);
1882                                 return false;
1883                         }
1884                 }
1885
1886                 if (!$following AND $sharing AND in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
1887                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
1888                         return false;
1889                 } elseif (!$following AND !$sharing) {
1890                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
1891                         return false;
1892                 } elseif (!$following AND $sharing) {
1893                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
1894                 } elseif ($following AND $sharing) {
1895                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
1896                 } elseif ($following AND !$sharing) {
1897                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
1898                 }
1899
1900                 $ret = self::person_by_handle($author);
1901
1902                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
1903                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
1904                         return false;
1905                 }
1906
1907                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
1908
1909                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
1910                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
1911                         intval($importer["uid"]),
1912                         dbesc($ret["network"]),
1913                         dbesc($ret["addr"]),
1914                         datetime_convert(),
1915                         dbesc($ret["url"]),
1916                         dbesc(normalise_link($ret["url"])),
1917                         dbesc($batch),
1918                         dbesc($ret["name"]),
1919                         dbesc($ret["nick"]),
1920                         dbesc($ret["photo"]),
1921                         dbesc($ret["pubkey"]),
1922                         dbesc($ret["notify"]),
1923                         dbesc($ret["poll"]),
1924                         1,
1925                         2
1926                 );
1927
1928                 // find the contact record we just created
1929
1930                 $contact_record = self::contact_by_handle($importer["uid"],$author);
1931
1932                 if (!$contact_record) {
1933                         logger("unable to locate newly created contact record.");
1934                         return;
1935                 }
1936
1937                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
1938
1939                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
1940
1941                 if(intval($def_gid))
1942                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
1943
1944                 update_contact_avatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
1945
1946                 if($importer["page-flags"] == PAGE_NORMAL) {
1947
1948                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
1949
1950                         $hash = random_string().(string)time();   // Generate a confirm_key
1951
1952                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
1953                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
1954                                 intval($importer["uid"]),
1955                                 intval($contact_record["id"]),
1956                                 0,
1957                                 0,
1958                                 dbesc(t("Sharing notification from Diaspora network")),
1959                                 dbesc($hash),
1960                                 dbesc(datetime_convert())
1961                         );
1962                 } else {
1963
1964                         // automatic friend approval
1965
1966                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
1967
1968                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
1969
1970                         // technically they are sharing with us (CONTACT_IS_SHARING),
1971                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
1972                         // we are going to change the relationship and make them a follower.
1973
1974                         if (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing AND $following)
1975                                 $new_relation = CONTACT_IS_FRIEND;
1976                         elseif (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing)
1977                                 $new_relation = CONTACT_IS_SHARING;
1978                         else
1979                                 $new_relation = CONTACT_IS_FOLLOWER;
1980
1981                         $r = q("UPDATE `contact` SET `rel` = %d,
1982                                 `name-date` = '%s',
1983                                 `uri-date` = '%s',
1984                                 `blocked` = 0,
1985                                 `pending` = 0,
1986                                 `writable` = 1
1987                                 WHERE `id` = %d
1988                                 ",
1989                                 intval($new_relation),
1990                                 dbesc(datetime_convert()),
1991                                 dbesc(datetime_convert()),
1992                                 intval($contact_record["id"])
1993                         );
1994
1995                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
1996                         if($u) {
1997                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
1998                                 $ret = self::send_share($u[0], $contact_record);
1999
2000                                 // Send the profile data, maybe it weren't transmitted before
2001                                 self::send_profile($importer["uid"], array($contact_record));
2002                         }
2003                 }
2004
2005                 return true;
2006         }
2007
2008         /**
2009          * @brief Fetches a message with a given guid
2010          *
2011          * @param string $guid message guid
2012          * @param string $orig_author handle of the original post
2013          * @param string $author handle of the sharer
2014          *
2015          * @return array The fetched item
2016          */
2017         private function original_item($guid, $orig_author, $author) {
2018
2019                 // Do we already have this item?
2020                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2021                                 `author-name`, `author-link`, `author-avatar`
2022                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2023                         dbesc($guid));
2024
2025                 if($r) {
2026                         logger("reshared message ".$guid." already exists on system.");
2027
2028                         // Maybe it is already a reshared item?
2029                         // Then refetch the content, if it is a reshare from a reshare.
2030                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2031                         if (self::is_reshare($r[0]["body"], true))
2032                                 $r = array();
2033                         elseif (self::is_reshare($r[0]["body"], false)) {
2034                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2035
2036                                 // Add OEmbed and other information to the body
2037                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
2038
2039                                 return $r[0];
2040                         } else
2041                                 return $r[0];
2042                 }
2043
2044                 if (!$r) {
2045                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2046                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2047                         $item_id = self::store_by_guid($guid, $server);
2048
2049                         if (!$item_id) {
2050                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2051                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
2052                                 $item_id = self::store_by_guid($guid, $server);
2053                         }
2054
2055                         if ($item_id) {
2056                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2057                                                 `author-name`, `author-link`, `author-avatar`
2058                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2059                                         intval($item_id));
2060
2061                                 if ($r) {
2062                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2063                                         if (self::is_reshare($r[0]["body"], false))
2064                                                 $r[0]["body"] = diaspora2bb(bb2diaspora($r[0]["body"]));
2065
2066                                         return $r[0];
2067                                 }
2068
2069                         }
2070                 }
2071                 return false;
2072         }
2073
2074         /**
2075          * @brief Processes a reshare message
2076          *
2077          * @param array $importer Array of the importer user
2078          * @param object $data The message object
2079          * @param string $xml The original XML of the message
2080          *
2081          * @return int the message id
2082          */
2083         private function receive_reshare($importer, $data, $xml) {
2084                 $root_author = notags(unxmlify($data->root_author));
2085                 $root_guid = notags(unxmlify($data->root_guid));
2086                 $guid = notags(unxmlify($data->guid));
2087                 $author = notags(unxmlify($data->author));
2088                 $public = notags(unxmlify($data->public));
2089                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2090
2091                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2092                 if (!$contact)
2093                         return false;
2094
2095                 $message_id = self::message_exists($importer["uid"], $guid);
2096                 if ($message_id)
2097                         return $message_id;
2098
2099                 $original_item = self::original_item($root_guid, $root_author, $author);
2100                 if (!$original_item)
2101                         return false;
2102
2103                 $orig_url = App::get_baseurl()."/display/".$original_item["guid"];
2104
2105                 $datarray = array();
2106
2107                 $datarray["uid"] = $importer["uid"];
2108                 $datarray["contact-id"] = $contact["id"];
2109                 $datarray["network"]  = NETWORK_DIASPORA;
2110
2111                 $datarray["author-name"] = $contact["name"];
2112                 $datarray["author-link"] = $contact["url"];
2113                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2114
2115                 $datarray["owner-name"] = $datarray["author-name"];
2116                 $datarray["owner-link"] = $datarray["author-link"];
2117                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2118
2119                 $datarray["guid"] = $guid;
2120                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2121
2122                 $datarray["verb"] = ACTIVITY_POST;
2123                 $datarray["gravity"] = GRAVITY_PARENT;
2124
2125                 $datarray["object"] = $xml;
2126
2127                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
2128                                         $original_item["guid"], $original_item["created"], $orig_url);
2129                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2130
2131                 $datarray["tag"] = $original_item["tag"];
2132                 $datarray["app"]  = $original_item["app"];
2133
2134                 $datarray["plink"] = self::plink($author, $guid);
2135                 $datarray["private"] = (($public == "false") ? 1 : 0);
2136                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2137
2138                 $datarray["object-type"] = $original_item["object-type"];
2139
2140                 self::fetch_guid($datarray);
2141                 $message_id = item_store($datarray);
2142
2143                 if ($message_id)
2144                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2145
2146                 return $message_id;
2147         }
2148
2149         /**
2150          * @brief Processes retractions
2151          *
2152          * @param array $importer Array of the importer user
2153          * @param array $contact The contact of the item owner
2154          * @param object $data The message object
2155          *
2156          * @return bool success
2157          */
2158         private function item_retraction($importer, $contact, $data) {
2159                 $target_type = notags(unxmlify($data->target_type));
2160                 $target_guid = notags(unxmlify($data->target_guid));
2161                 $author = notags(unxmlify($data->author));
2162
2163                 $person = self::person_by_handle($author);
2164                 if (!is_array($person)) {
2165                         logger("unable to find author detail for ".$author);
2166                         return false;
2167                 }
2168
2169                 $r = q("SELECT `id`, `parent`, `parent-uri`, `author-link` FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
2170                         dbesc($target_guid),
2171                         intval($importer["uid"])
2172                 );
2173                 if (!$r)
2174                         return false;
2175
2176                 // Check if the sender is the thread owner
2177                 $p = q("SELECT `id`, `author-link`, `origin` FROM `item` WHERE `id` = %d",
2178                         intval($r[0]["parent"]));
2179
2180                 // Only delete it if the parent author really fits
2181                 if (!link_compare($p[0]["author-link"], $contact["url"]) AND !link_compare($r[0]["author-link"], $contact["url"])) {
2182                         logger("Thread author ".$p[0]["author-link"]." and item author ".$r[0]["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2183                         return false;
2184                 }
2185
2186                 // 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
2187                 q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' WHERE `id` = %d",
2188                         dbesc(datetime_convert()),
2189                         dbesc(datetime_convert()),
2190                         intval($r[0]["id"])
2191                 );
2192                 delete_thread($r[0]["id"], $r[0]["parent-uri"]);
2193
2194                 logger("Deleted target ".$target_guid." (".$r[0]["id"].") from user ".$importer["uid"]." parent: ".$p[0]["id"], LOGGER_DEBUG);
2195
2196                 // Now check if the retraction needs to be relayed by us
2197                 if($p[0]["origin"]) {
2198                         // notify others
2199                         proc_run(PRIORITY_HIGH, "include/notifier.php", "drop", $r[0]["id"]);
2200                 }
2201
2202                 return true;
2203         }
2204
2205         /**
2206          * @brief Receives retraction messages
2207          *
2208          * @param array $importer Array of the importer user
2209          * @param string $sender The sender of the message
2210          * @param object $data The message object
2211          *
2212          * @return bool Success
2213          */
2214         private function receive_retraction($importer, $sender, $data) {
2215                 $target_type = notags(unxmlify($data->target_type));
2216
2217                 $contact = self::contact_by_handle($importer["uid"], $sender);
2218                 if (!$contact) {
2219                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2220                         return false;
2221                 }
2222
2223                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2224
2225                 switch ($target_type) {
2226                         case "Comment":
2227                         case "Like":
2228                         case "Post": // "Post" will be supported in a future version
2229                         case "Reshare":
2230                         case "StatusMessage":
2231                                 return self::item_retraction($importer, $contact, $data);;
2232
2233                         case "Contact":
2234                         case "Person":
2235                                 /// @todo What should we do with an "unshare"?
2236                                 // Removing the contact isn't correct since we still can read the public items
2237                                 contact_remove($contact["id"]);
2238                                 return true;
2239
2240                         default:
2241                                 logger("Unknown target type ".$target_type);
2242                                 return false;
2243                 }
2244                 return true;
2245         }
2246
2247         /**
2248          * @brief Receives status messages
2249          *
2250          * @param array $importer Array of the importer user
2251          * @param object $data The message object
2252          * @param string $xml The original XML of the message
2253          *
2254          * @return int The message id of the newly created item
2255          */
2256         private function receive_status_message($importer, $data, $xml) {
2257                 $raw_message = unxmlify($data->raw_message);
2258                 $guid = notags(unxmlify($data->guid));
2259                 $author = notags(unxmlify($data->author));
2260                 $public = notags(unxmlify($data->public));
2261                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2262                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2263
2264                 /// @todo enable support for polls
2265                 //if ($data->poll) {
2266                 //      foreach ($data->poll AS $poll)
2267                 //              print_r($poll);
2268                 //      die("poll!\n");
2269                 //}
2270                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2271                 if (!$contact)
2272                         return false;
2273
2274                 $message_id = self::message_exists($importer["uid"], $guid);
2275                 if ($message_id)
2276                         return $message_id;
2277
2278                 $address = array();
2279                 if ($data->location)
2280                         foreach ($data->location->children() AS $fieldname => $data)
2281                                 $address[$fieldname] = notags(unxmlify($data));
2282
2283                 $body = diaspora2bb($raw_message);
2284
2285                 $datarray = array();
2286
2287                 // Attach embedded pictures to the body
2288                 if ($data->photo) {
2289                         foreach ($data->photo AS $photo)
2290                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2291                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2292
2293                         $datarray["object-type"] = ACTIVITY_OBJ_PHOTO;
2294                 } else {
2295                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2296
2297                         // Add OEmbed and other information to the body
2298                         if (!self::is_redmatrix($contact["url"]))
2299                                 $body = add_page_info_to_body($body, false, true);
2300                 }
2301
2302                 $datarray["uid"] = $importer["uid"];
2303                 $datarray["contact-id"] = $contact["id"];
2304                 $datarray["network"] = NETWORK_DIASPORA;
2305
2306                 $datarray["author-name"] = $contact["name"];
2307                 $datarray["author-link"] = $contact["url"];
2308                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2309
2310                 $datarray["owner-name"] = $datarray["author-name"];
2311                 $datarray["owner-link"] = $datarray["author-link"];
2312                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2313
2314                 $datarray["guid"] = $guid;
2315                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2316
2317                 $datarray["verb"] = ACTIVITY_POST;
2318                 $datarray["gravity"] = GRAVITY_PARENT;
2319
2320                 $datarray["object"] = $xml;
2321
2322                 $datarray["body"] = $body;
2323
2324                 if ($provider_display_name != "")
2325                         $datarray["app"] = $provider_display_name;
2326
2327                 $datarray["plink"] = self::plink($author, $guid);
2328                 $datarray["private"] = (($public == "false") ? 1 : 0);
2329                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2330
2331                 if (isset($address["address"]))
2332                         $datarray["location"] = $address["address"];
2333
2334                 if (isset($address["lat"]) AND isset($address["lng"]))
2335                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2336
2337                 self::fetch_guid($datarray);
2338                 $message_id = item_store($datarray);
2339
2340                 if ($message_id)
2341                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2342
2343                 return $message_id;
2344         }
2345
2346         /* ************************************************************************************** *
2347          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2348          * ************************************************************************************** */
2349
2350         /**
2351          * @brief returnes the handle of a contact
2352          *
2353          * @param array $me contact array
2354          *
2355          * @return string the handle in the format user@domain.tld
2356          */
2357         private function my_handle($contact) {
2358                 if ($contact["addr"] != "")
2359                         return $contact["addr"];
2360
2361                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2362                 // So - just in case - we build the the address here.
2363                 if ($contact["nickname"] != "")
2364                         $nick = $contact["nickname"];
2365                 else
2366                         $nick = $contact["nick"];
2367
2368                 return $nick."@".substr(App::get_baseurl(), strpos(App::get_baseurl(),"://") + 3);
2369         }
2370
2371         /**
2372          * @brief Creates the envelope for the "fetch" endpoint
2373          *
2374          * @param string $msg The message that is to be transmitted
2375          * @param array $user The record of the sender
2376          *
2377          * @return string The envelope
2378          */
2379
2380         public static function build_magic_envelope($msg, $user) {
2381
2382                 $b64url_data = base64url_encode($msg);
2383                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2384
2385                 $key_id = base64url_encode(diaspora::my_handle($user));
2386                 $type = "application/xml";
2387                 $encoding = "base64url";
2388                 $alg = "RSA-SHA256";
2389                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2390                 $signature = rsa_sign($signable_data, $user["prvkey"]);
2391                 $sig = base64url_encode($signature);
2392
2393                 $xmldata = array("me:env" => array("me:data" => $data,
2394                                                         "@attributes" => array("type" => $type),
2395                                                         "me:encoding" => $encoding,
2396                                                         "me:alg" => $alg,
2397                                                         "me:sig" => $sig,
2398                                                         "@attributes2" => array("key_id" => $key_id)));
2399
2400                 $namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
2401
2402                 return xml::from_array($xmldata, $xml, false, $namespaces);
2403         }
2404
2405         /**
2406          * @brief Creates the envelope for a public message
2407          *
2408          * @param string $msg The message that is to be transmitted
2409          * @param array $user The record of the sender
2410          * @param array $contact Target of the communication
2411          * @param string $prvkey The private key of the sender
2412          * @param string $pubkey The public key of the receiver
2413          *
2414          * @return string The envelope
2415          */
2416         private function build_public_message($msg, $user, $contact, $prvkey, $pubkey) {
2417
2418                 logger("Message: ".$msg, LOGGER_DATA);
2419
2420                 $handle = self::my_handle($user);
2421
2422                 $b64url_data = base64url_encode($msg);
2423
2424                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2425
2426                 $type = "application/xml";
2427                 $encoding = "base64url";
2428                 $alg = "RSA-SHA256";
2429
2430                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2431
2432                 $signature = rsa_sign($signable_data,$prvkey);
2433                 $sig = base64url_encode($signature);
2434
2435                 $xmldata = array("diaspora" => array("header" => array("author_id" => $handle),
2436                                                         "me:env" => array("me:encoding" => $encoding,
2437                                                         "me:alg" => $alg,
2438                                                         "me:data" => $data,
2439                                                         "@attributes" => array("type" => $type),
2440                                                         "me:sig" => $sig)));
2441
2442                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2443                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2444
2445                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2446
2447                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2448                 return $magic_env;
2449         }
2450
2451         /**
2452          * @brief Creates the envelope for a private message
2453          *
2454          * @param string $msg The message that is to be transmitted
2455          * @param array $user The record of the sender
2456          * @param array $contact Target of the communication
2457          * @param string $prvkey The private key of the sender
2458          * @param string $pubkey The public key of the receiver
2459          *
2460          * @return string The envelope
2461          */
2462         private function build_private_message($msg, $user, $contact, $prvkey, $pubkey) {
2463
2464                 logger("Message: ".$msg, LOGGER_DATA);
2465
2466                 // without a public key nothing will work
2467
2468                 if (!$pubkey) {
2469                         logger("pubkey missing: contact id: ".$contact["id"]);
2470                         return false;
2471                 }
2472
2473                 $inner_aes_key = random_string(32);
2474                 $b_inner_aes_key = base64_encode($inner_aes_key);
2475                 $inner_iv = random_string(16);
2476                 $b_inner_iv = base64_encode($inner_iv);
2477
2478                 $outer_aes_key = random_string(32);
2479                 $b_outer_aes_key = base64_encode($outer_aes_key);
2480                 $outer_iv = random_string(16);
2481                 $b_outer_iv = base64_encode($outer_iv);
2482
2483                 $handle = self::my_handle($user);
2484
2485                 $padded_data = pkcs5_pad($msg,16);
2486                 $inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);
2487
2488                 $b64_data = base64_encode($inner_encrypted);
2489
2490
2491                 $b64url_data = base64url_encode($b64_data);
2492                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2493
2494                 $type = "application/xml";
2495                 $encoding = "base64url";
2496                 $alg = "RSA-SHA256";
2497
2498                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2499
2500                 $signature = rsa_sign($signable_data,$prvkey);
2501                 $sig = base64url_encode($signature);
2502
2503                 $xmldata = array("decrypted_header" => array("iv" => $b_inner_iv,
2504                                                         "aes_key" => $b_inner_aes_key,
2505                                                         "author_id" => $handle));
2506
2507                 $decrypted_header = xml::from_array($xmldata, $xml, true);
2508                 $decrypted_header = pkcs5_pad($decrypted_header,16);
2509
2510                 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
2511
2512                 $outer_json = json_encode(array("iv" => $b_outer_iv, "key" => $b_outer_aes_key));
2513
2514                 $encrypted_outer_key_bundle = "";
2515                 openssl_public_encrypt($outer_json, $encrypted_outer_key_bundle, $pubkey);
2516
2517                 $b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);
2518
2519                 logger("outer_bundle: ".$b64_encrypted_outer_key_bundle." key: ".$pubkey, LOGGER_DATA);
2520
2521                 $encrypted_header_json_object = json_encode(array("aes_key" => base64_encode($encrypted_outer_key_bundle),
2522                                                                 "ciphertext" => base64_encode($ciphertext)));
2523                 $cipher_json = base64_encode($encrypted_header_json_object);
2524
2525                 $xmldata = array("diaspora" => array("encrypted_header" => $cipher_json,
2526                                                 "me:env" => array("me:encoding" => $encoding,
2527                                                                 "me:alg" => $alg,
2528                                                                 "me:data" => $data,
2529                                                                 "@attributes" => array("type" => $type),
2530                                                                 "me:sig" => $sig)));
2531
2532                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2533                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2534
2535                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2536
2537                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2538                 return $magic_env;
2539         }
2540
2541         /**
2542          * @brief Create the envelope for a message
2543          *
2544          * @param string $msg The message that is to be transmitted
2545          * @param array $user The record of the sender
2546          * @param array $contact Target of the communication
2547          * @param string $prvkey The private key of the sender
2548          * @param string $pubkey The public key of the receiver
2549          * @param bool $public Is the message public?
2550          *
2551          * @return string The message that will be transmitted to other servers
2552          */
2553         private function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
2554
2555                 if ($public)
2556                         $magic_env =  self::build_public_message($msg,$user,$contact,$prvkey,$pubkey);
2557                 else
2558                         $magic_env =  self::build_private_message($msg,$user,$contact,$prvkey,$pubkey);
2559
2560                 // The data that will be transmitted is double encoded via "urlencode", strange ...
2561                 $slap = "xml=".urlencode(urlencode($magic_env));
2562                 return $slap;
2563         }
2564
2565         /**
2566          * @brief Creates a signature for a message
2567          *
2568          * @param array $owner the array of the owner of the message
2569          * @param array $message The message that is to be signed
2570          *
2571          * @return string The signature
2572          */
2573         private function signature($owner, $message) {
2574                 $sigmsg = $message;
2575                 unset($sigmsg["author_signature"]);
2576                 unset($sigmsg["parent_author_signature"]);
2577
2578                 $signed_text = implode(";", $sigmsg);
2579
2580                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2581         }
2582
2583         /**
2584          * @brief Transmit a message to a target server
2585          *
2586          * @param array $owner the array of the item owner
2587          * @param array $contact Target of the communication
2588          * @param string $slap The message that is to be transmitted
2589          * @param bool $public_batch Is it a public post?
2590          * @param bool $queue_run Is the transmission called from the queue?
2591          * @param string $guid message guid
2592          *
2593          * @return int Result of the transmission
2594          */
2595         public static function transmit($owner, $contact, $slap, $public_batch, $queue_run=false, $guid = "") {
2596
2597                 $a = get_app();
2598
2599                 $enabled = intval(get_config("system", "diaspora_enabled"));
2600                 if(!$enabled)
2601                         return 200;
2602
2603                 $logid = random_string(4);
2604                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2605                 if (!$dest_url) {
2606                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2607                         return 0;
2608                 }
2609
2610                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2611
2612                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2613                         $return_code = 0;
2614                 } else {
2615                         if (!intval(get_config("system", "diaspora_test"))) {
2616                                 post_url($dest_url."/", $slap);
2617                                 $return_code = $a->get_curl_code();
2618                         } else {
2619                                 logger("test_mode");
2620                                 return 200;
2621                         }
2622                 }
2623
2624                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2625
2626                 if(!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2627                         logger("queue message");
2628
2629                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2630                                 intval($contact["id"]),
2631                                 dbesc(NETWORK_DIASPORA),
2632                                 dbesc($slap),
2633                                 intval($public_batch)
2634                         );
2635                         if($r) {
2636                                 logger("add_to_queue ignored - identical item already in queue");
2637                         } else {
2638                                 // queue message for redelivery
2639                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $slap, $public_batch);
2640
2641                                 // The message could not be delivered. We mark the contact as "dead"
2642                                 mark_for_death($contact);
2643                         }
2644                 } elseif (($return_code >= 200) AND ($return_code <= 299)) {
2645                         // We successfully delivered a message, the contact is alive
2646                         unmark_for_death($contact);
2647                 }
2648
2649                 return(($return_code) ? $return_code : (-1));
2650         }
2651
2652
2653         /**
2654          * @brief Build the post xml
2655          *
2656          * @param string $type The message type
2657          * @param array $message The message data
2658          *
2659          * @return string The post XML
2660          */
2661         public static function build_post_xml($type, $message) {
2662
2663                 $data = array("XML" => array("post" => array($type => $message)));
2664                 return xml::from_array($data, $xml);
2665         }
2666
2667         /**
2668          * @brief Builds and transmit messages
2669          *
2670          * @param array $owner the array of the item owner
2671          * @param array $contact Target of the communication
2672          * @param string $type The message type
2673          * @param array $message The message data
2674          * @param bool $public_batch Is it a public post?
2675          * @param string $guid message guid
2676          * @param bool $spool Should the transmission be spooled or transmitted?
2677          *
2678          * @return int Result of the transmission
2679          */
2680         private function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false) {
2681
2682                 $msg = self::build_post_xml($type, $message);
2683
2684                 logger('message: '.$msg, LOGGER_DATA);
2685                 logger('send guid '.$guid, LOGGER_DEBUG);
2686
2687                 // Fallback if the private key wasn't transmitted in the expected field
2688                 if ($owner['uprvkey'] == "")
2689                         $owner['uprvkey'] = $owner['prvkey'];
2690
2691                 $slap = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
2692
2693                 if ($spool) {
2694                         add_to_queue($contact['id'], NETWORK_DIASPORA, $slap, $public_batch);
2695                         return true;
2696                 } else
2697                         $return_code = self::transmit($owner, $contact, $slap, $public_batch, false, $guid);
2698
2699                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
2700
2701                 return $return_code;
2702         }
2703
2704         /**
2705          * @brief Sends a "share" message
2706          *
2707          * @param array $owner the array of the item owner
2708          * @param array $contact Target of the communication
2709          *
2710          * @return int The result of the transmission
2711          */
2712         public static function send_share($owner,$contact) {
2713
2714                 $message = array("sender_handle" => self::my_handle($owner),
2715                                 "recipient_handle" => $contact["addr"]);
2716
2717                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
2718
2719                 return self::build_and_transmit($owner, $contact, "request", $message);
2720         }
2721
2722         /**
2723          * @brief sends an "unshare"
2724          *
2725          * @param array $owner the array of the item owner
2726          * @param array $contact Target of the communication
2727          *
2728          * @return int The result of the transmission
2729          */
2730         public static function send_unshare($owner,$contact) {
2731
2732                 $message = array("post_guid" => $owner["guid"],
2733                                 "diaspora_handle" => self::my_handle($owner),
2734                                 "type" => "Person");
2735
2736                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
2737
2738                 return self::build_and_transmit($owner, $contact, "retraction", $message);
2739         }
2740
2741         /**
2742          * @brief Checks a message body if it is a reshare
2743          *
2744          * @param string $body The message body that is to be check
2745          * @param bool $complete Should it be a complete check or a simple check?
2746          *
2747          * @return array|bool Reshare details or "false" if no reshare
2748          */
2749         public static function is_reshare($body, $complete = true) {
2750                 $body = trim($body);
2751
2752                 // Skip if it isn't a pure repeated messages
2753                 // Does it start with a share?
2754                 if ((strpos($body, "[share") > 0) AND $complete)
2755                         return(false);
2756
2757                 // Does it end with a share?
2758                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
2759                         return(false);
2760
2761                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
2762                 // Skip if there is no shared message in there
2763                 if ($body == $attributes)
2764                         return(false);
2765
2766                 // If we don't do the complete check we quit here
2767                 if (!$complete)
2768                         return true;
2769
2770                 $guid = "";
2771                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
2772                 if ($matches[1] != "")
2773                         $guid = $matches[1];
2774
2775                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
2776                 if ($matches[1] != "")
2777                         $guid = $matches[1];
2778
2779                 if ($guid != "") {
2780                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
2781                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
2782                         if ($r) {
2783                                 $ret= array();
2784                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
2785                                 $ret["root_guid"] = $guid;
2786                                 return($ret);
2787                         }
2788                 }
2789
2790                 $profile = "";
2791                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
2792                 if ($matches[1] != "")
2793                         $profile = $matches[1];
2794
2795                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
2796                 if ($matches[1] != "")
2797                         $profile = $matches[1];
2798
2799                 $ret= array();
2800
2801                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
2802                 if (($ret["root_handle"] == $profile) OR ($ret["root_handle"] == ""))
2803                         return(false);
2804
2805                 $link = "";
2806                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
2807                 if ($matches[1] != "")
2808                         $link = $matches[1];
2809
2810                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
2811                 if ($matches[1] != "")
2812                         $link = $matches[1];
2813
2814                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
2815                 if (($ret["root_guid"] == $link) OR (trim($ret["root_guid"]) == ""))
2816                         return(false);
2817
2818                 return($ret);
2819         }
2820
2821         /**
2822          * @brief Create a post (status message or reshare)
2823          *
2824          * @param array $item The item that will be exported
2825          * @param array $owner the array of the item owner
2826          *
2827          * @return array
2828          * 'type' -> Message type ("status_message" or "reshare")
2829          * 'message' -> Array of XML elements of the status
2830          */
2831         public static function build_status($item, $owner) {
2832
2833                 $myaddr = self::my_handle($owner);
2834
2835                 $public = (($item["private"]) ? "false" : "true");
2836
2837                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
2838
2839                 // Detect a share element and do a reshare
2840                 if (!$item['private'] AND ($ret = self::is_reshare($item["body"]))) {
2841                         $message = array("root_diaspora_id" => $ret["root_handle"],
2842                                         "root_guid" => $ret["root_guid"],
2843                                         "guid" => $item["guid"],
2844                                         "diaspora_handle" => $myaddr,
2845                                         "public" => $public,
2846                                         "created_at" => $created,
2847                                         "provider_display_name" => $item["app"]);
2848
2849                         $type = "reshare";
2850                 } else {
2851                         $title = $item["title"];
2852                         $body = $item["body"];
2853
2854                         // convert to markdown
2855                         $body = html_entity_decode(bb2diaspora($body));
2856
2857                         // Adding the title
2858                         if(strlen($title))
2859                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
2860
2861                         if ($item["attach"]) {
2862                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
2863                                 if(cnt) {
2864                                         $body .= "\n".t("Attachments:")."\n";
2865                                         foreach($matches as $mtch)
2866                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
2867                                 }
2868                         }
2869
2870                         $location = array();
2871
2872                         if ($item["location"] != "")
2873                                 $location["address"] = $item["location"];
2874
2875                         if ($item["coord"] != "") {
2876                                 $coord = explode(" ", $item["coord"]);
2877                                 $location["lat"] = $coord[0];
2878                                 $location["lng"] = $coord[1];
2879                         }
2880
2881                         $message = array("raw_message" => $body,
2882                                         "location" => $location,
2883                                         "guid" => $item["guid"],
2884                                         "diaspora_handle" => $myaddr,
2885                                         "public" => $public,
2886                                         "created_at" => $created,
2887                                         "provider_display_name" => $item["app"]);
2888
2889                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
2890                         if (!isset($location["lat"]) OR !isset($location["lng"])) {
2891                                 unset($message["location"]);
2892                         }
2893
2894                         $type = "status_message";
2895                 }
2896                 return array("type" => $type, "message" => $message);
2897         }
2898
2899         /**
2900          * @brief Sends a post
2901          *
2902          * @param array $item The item that will be exported
2903          * @param array $owner the array of the item owner
2904          * @param array $contact Target of the communication
2905          * @param bool $public_batch Is it a public post?
2906          *
2907          * @return int The result of the transmission
2908          */
2909         public static function send_status($item, $owner, $contact, $public_batch = false) {
2910
2911                 $status = diaspora::build_status($item, $owner);
2912
2913                 return self::build_and_transmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
2914         }
2915
2916         /**
2917          * @brief Creates a "like" object
2918          *
2919          * @param array $item The item that will be exported
2920          * @param array $owner the array of the item owner
2921          *
2922          * @return array The data for a "like"
2923          */
2924         private function construct_like($item, $owner) {
2925
2926                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
2927                         dbesc($item["thr-parent"]));
2928                 if(!$p)
2929                         return false;
2930
2931                 $parent = $p[0];
2932
2933                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
2934                 $positive = "true";
2935
2936                 return(array("positive" => $positive,
2937                                 "guid" => $item["guid"],
2938                                 "target_type" => $target_type,
2939                                 "parent_guid" => $parent["guid"],
2940                                 "author_signature" => "",
2941                                 "diaspora_handle" => self::my_handle($owner)));
2942         }
2943
2944         /**
2945          * @brief Creates the object for a comment
2946          *
2947          * @param array $item The item that will be exported
2948          * @param array $owner the array of the item owner
2949          *
2950          * @return array The data for a comment
2951          */
2952         private function construct_comment($item, $owner) {
2953
2954                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
2955                         intval($item["parent"]),
2956                         intval($item["parent"])
2957                 );
2958
2959                 if (!$p)
2960                         return false;
2961
2962                 $parent = $p[0];
2963
2964                 $text = html_entity_decode(bb2diaspora($item["body"]));
2965
2966                 return(array("guid" => $item["guid"],
2967                                 "parent_guid" => $parent["guid"],
2968                                 "author_signature" => "",
2969                                 "text" => $text,
2970                                 "diaspora_handle" => self::my_handle($owner)));
2971         }
2972
2973         /**
2974          * @brief Send a like or a comment
2975          *
2976          * @param array $item The item that will be exported
2977          * @param array $owner the array of the item owner
2978          * @param array $contact Target of the communication
2979          * @param bool $public_batch Is it a public post?
2980          *
2981          * @return int The result of the transmission
2982          */
2983         public static function send_followup($item,$owner,$contact,$public_batch = false) {
2984
2985                 if($item['verb'] === ACTIVITY_LIKE) {
2986                         $message = self::construct_like($item, $owner);
2987                         $type = "like";
2988                 } else {
2989                         $message = self::construct_comment($item, $owner);
2990                         $type = "comment";
2991                 }
2992
2993                 if (!$message)
2994                         return false;
2995
2996                 $message["author_signature"] = self::signature($owner, $message);
2997
2998                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
2999         }
3000
3001         /**
3002          * @brief Creates a message from a signature record entry
3003          *
3004          * @param array $item The item that will be exported
3005          * @param array $signature The entry of the "sign" record
3006          *
3007          * @return string The message
3008          */
3009         private function message_from_signature($item, $signature) {
3010
3011                 // Split the signed text
3012                 $signed_parts = explode(";", $signature['signed_text']);
3013
3014                 if ($item["deleted"])
3015                         $message = array("parent_author_signature" => "",
3016                                         "target_guid" => $signed_parts[0],
3017                                         "target_type" => $signed_parts[1],
3018                                         "sender_handle" => $signature['signer'],
3019                                         "target_author_signature" => $signature['signature']);
3020                 elseif ($item['verb'] === ACTIVITY_LIKE)
3021                         $message = array("positive" => $signed_parts[0],
3022                                         "guid" => $signed_parts[1],
3023                                         "target_type" => $signed_parts[2],
3024                                         "parent_guid" => $signed_parts[3],
3025                                         "parent_author_signature" => "",
3026                                         "author_signature" => $signature['signature'],
3027                                         "diaspora_handle" => $signed_parts[4]);
3028                 else {
3029                         // Remove the comment guid
3030                         $guid = array_shift($signed_parts);
3031
3032                         // Remove the parent guid
3033                         $parent_guid = array_shift($signed_parts);
3034
3035                         // Remove the handle
3036                         $handle = array_pop($signed_parts);
3037
3038                         // Glue the parts together
3039                         $text = implode(";", $signed_parts);
3040
3041                         $message = array("guid" => $guid,
3042                                         "parent_guid" => $parent_guid,
3043                                         "parent_author_signature" => "",
3044                                         "author_signature" => $signature['signature'],
3045                                         "text" => implode(";", $signed_parts),
3046                                         "diaspora_handle" => $handle);
3047                 }
3048                 return $message;
3049         }
3050
3051         /**
3052          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3053          *
3054          * @param array $item The item that will be exported
3055          * @param array $owner the array of the item owner
3056          * @param array $contact Target of the communication
3057          * @param bool $public_batch Is it a public post?
3058          *
3059          * @return int The result of the transmission
3060          */
3061         public static function send_relay($item, $owner, $contact, $public_batch = false) {
3062
3063                 if ($item["deleted"])
3064                         return self::send_retraction($item, $owner, $contact, $public_batch, true);
3065                 elseif ($item['verb'] === ACTIVITY_LIKE)
3066                         $type = "like";
3067                 else
3068                         $type = "comment";
3069
3070                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3071
3072                 // fetch the original signature
3073
3074                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3075                         intval($item["id"]));
3076
3077                 if (!$r) {
3078                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3079                         return false;
3080                 }
3081
3082                 $signature = $r[0];
3083
3084                 // Old way - is used by the internal Friendica functions
3085                 /// @todo Change all signatur storing functions to the new format
3086                 if ($signature['signed_text'] AND $signature['signature'] AND $signature['signer'])
3087                         $message = self::message_from_signature($item, $signature);
3088                 else {// New way
3089                         $msg = json_decode($signature['signed_text'], true);
3090
3091                         $message = array();
3092                         if (is_array($msg)) {
3093                                 foreach ($msg AS $field => $data) {
3094                                         if (!$item["deleted"]) {
3095                                                 if ($field == "author")
3096                                                         $field = "diaspora_handle";
3097                                                 if ($field == "parent_type")
3098                                                         $field = "target_type";
3099                                         }
3100
3101                                         $message[$field] = $data;
3102                                 }
3103                         } else
3104                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3105                 }
3106
3107                 $message["parent_author_signature"] = self::signature($owner, $message);
3108
3109                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3110
3111                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3112         }
3113
3114         /**
3115          * @brief Sends a retraction (deletion) of a message, like or comment
3116          *
3117          * @param array $item The item that will be exported
3118          * @param array $owner the array of the item owner
3119          * @param array $contact Target of the communication
3120          * @param bool $public_batch Is it a public post?
3121          * @param bool $relay Is the retraction transmitted from a relay?
3122          *
3123          * @return int The result of the transmission
3124          */
3125         public static function send_retraction($item, $owner, $contact, $public_batch = false, $relay = false) {
3126
3127                 $itemaddr = self::handle_from_contact($item["contact-id"], $item["gcontact-id"]);
3128
3129                 // Check whether the retraction is for a top-level post or whether it's a relayable
3130                 if ($item["uri"] !== $item["parent-uri"]) {
3131                         $msg_type = "relayable_retraction";
3132                         $target_type = (($item["verb"] === ACTIVITY_LIKE) ? "Like" : "Comment");
3133                 } else {
3134                         $msg_type = "signed_retraction";
3135                         $target_type = "StatusMessage";
3136                 }
3137
3138                 if ($relay AND ($item["uri"] !== $item["parent-uri"]))
3139                         $signature = "parent_author_signature";
3140                 else
3141                         $signature = "target_author_signature";
3142
3143                 $signed_text = $item["guid"].";".$target_type;
3144
3145                 $message = array("target_guid" => $item['guid'],
3146                                 "target_type" => $target_type,
3147                                 "sender_handle" => $itemaddr,
3148                                 $signature => base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')));
3149
3150                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3151
3152                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3153         }
3154
3155         /**
3156          * @brief Sends a mail
3157          *
3158          * @param array $item The item that will be exported
3159          * @param array $owner The owner
3160          * @param array $contact Target of the communication
3161          *
3162          * @return int The result of the transmission
3163          */
3164         public static function send_mail($item, $owner, $contact) {
3165
3166                 $myaddr = self::my_handle($owner);
3167
3168                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3169                         intval($item["convid"]),
3170                         intval($item["uid"])
3171                 );
3172
3173                 if (!$r) {
3174                         logger("conversation not found.");
3175                         return;
3176                 }
3177                 $cnv = $r[0];
3178
3179                 $conv = array(
3180                         "guid" => $cnv["guid"],
3181                         "subject" => $cnv["subject"],
3182                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
3183                         "diaspora_handle" => $cnv["creator"],
3184                         "participant_handles" => $cnv["recips"]
3185                 );
3186
3187                 $body = bb2diaspora($item["body"]);
3188                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
3189
3190                 $signed_text = $item["guid"].";".$cnv["guid"].";".$body.";".$created.";".$myaddr.";".$cnv['guid'];
3191                 $sig = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
3192
3193                 $msg = array(
3194                         "guid" => $item["guid"],
3195                         "parent_guid" => $cnv["guid"],
3196                         "parent_author_signature" => $sig,
3197                         "author_signature" => $sig,
3198                         "text" => $body,
3199                         "created_at" => $created,
3200                         "diaspora_handle" => $myaddr,
3201                         "conversation_guid" => $cnv["guid"]
3202                 );
3203
3204                 if ($item["reply"]) {
3205                         $message = $msg;
3206                         $type = "message";
3207                 } else {
3208                         $message = array("guid" => $cnv["guid"],
3209                                         "subject" => $cnv["subject"],
3210                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
3211                                         "message" => $msg,
3212                                         "diaspora_handle" => $cnv["creator"],
3213                                         "participant_handles" => $cnv["recips"]);
3214
3215                         $type = "conversation";
3216                 }
3217
3218                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
3219         }
3220
3221         /**
3222          * @brief Sends profile data
3223          *
3224          * @param int $uid The user id
3225          */
3226         public static function send_profile($uid, $recips = false) {
3227
3228                 if (!$uid)
3229                         return;
3230
3231                 if (!$recips)
3232                         $recips = q("SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3233                                 AND `uid` = %d AND `rel` != %d",
3234                                 dbesc(NETWORK_DIASPORA),
3235                                 intval($uid),
3236                                 intval(CONTACT_IS_SHARING)
3237                         );
3238                 if (!$recips)
3239                         return;
3240
3241                 $r = q("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3242                         FROM `profile`
3243                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3244                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3245                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3246                         intval($uid)
3247                 );
3248
3249                 if (!$r)
3250                         return;
3251
3252                 $profile = $r[0];
3253
3254                 $handle = $profile["addr"];
3255                 $first = ((strpos($profile['name'],' ')
3256                         ? trim(substr($profile['name'],0,strpos($profile['name'],' '))) : $profile['name']));
3257                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3258                 $large = App::get_baseurl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3259                 $medium = App::get_baseurl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3260                 $small = App::get_baseurl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3261                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
3262
3263                 if ($searchable === 'true') {
3264                         $dob = '1000-00-00';
3265
3266                         if (($profile['dob']) && ($profile['dob'] != '0000-00-00'))
3267                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC','UTC',$profile['dob'],'m-d');
3268
3269                         $about = $profile['about'];
3270                         $about = strip_tags(bbcode($about));
3271
3272                         $location = formatted_location($profile);
3273                         $tags = '';
3274                         if ($profile['pub_keywords']) {
3275                                 $kw = str_replace(',',' ',$profile['pub_keywords']);
3276                                 $kw = str_replace('  ',' ',$kw);
3277                                 $arr = explode(' ',$profile['pub_keywords']);
3278                                 if (count($arr)) {
3279                                         for($x = 0; $x < 5; $x ++) {
3280                                                 if (trim($arr[$x]))
3281                                                         $tags .= '#'. trim($arr[$x]) .' ';
3282                                         }
3283                                 }
3284                         }
3285                         $tags = trim($tags);
3286                 }
3287
3288                 $message = array("diaspora_handle" => $handle,
3289                                 "first_name" => $first,
3290                                 "last_name" => $last,
3291                                 "image_url" => $large,
3292                                 "image_url_medium" => $medium,
3293                                 "image_url_small" => $small,
3294                                 "birthday" => $dob,
3295                                 "gender" => $profile['gender'],
3296                                 "bio" => $about,
3297                                 "location" => $location,
3298                                 "searchable" => $searchable,
3299                                 "tag_string" => $tags);
3300
3301                 foreach($recips as $recip) {
3302                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
3303                         self::build_and_transmit($profile, $recip, "profile", $message, false, "", true);
3304                 }
3305         }
3306
3307         /**
3308          * @brief Stores the signature for likes that are created on our system
3309          *
3310          * @param array $contact The contact array of the "like"
3311          * @param int $post_id The post id of the "like"
3312          *
3313          * @return bool Success
3314          */
3315         public static function store_like_signature($contact, $post_id) {
3316
3317                 // Is the contact the owner? Then fetch the private key
3318                 if (!$contact['self'] OR ($contact['uid'] == 0)) {
3319                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
3320                         return false;
3321                 }
3322
3323                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
3324                 if(!$r)
3325                         return false;
3326
3327                 $contact["uprvkey"] = $r[0]['prvkey'];
3328
3329                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
3330                 if (!$r)
3331                         return false;
3332
3333                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE)))
3334                         return false;
3335
3336                 $message = self::construct_like($r[0], $contact);
3337                 $message["author_signature"] = self::signature($contact, $message);
3338
3339                 // In the future we will store the signature more flexible to support new fields.
3340                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3341                 // (We are transmitting this data here via DFRN)
3342
3343                 $signed_text = $message["positive"].";".$message["guid"].";".$message["target_type"].";".
3344                                 $message["parent_guid"].";".$message["diaspora_handle"];
3345
3346                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3347                         intval($post_id),
3348                         dbesc($signed_text),
3349                         dbesc($message["author_signature"]),
3350                         dbesc($message["diaspora_handle"])
3351                 );
3352
3353                 // This here will replace the lines above, once Diaspora changed its protocol
3354                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3355                 //      intval($message_id),
3356                 //      dbesc(json_encode($message))
3357                 //);
3358
3359                 logger('Stored diaspora like signature');
3360                 return true;
3361         }
3362
3363         /**
3364          * @brief Stores the signature for comments that are created on our system
3365          *
3366          * @param array $item The item array of the comment
3367          * @param array $contact The contact array of the item owner
3368          * @param string $uprvkey The private key of the sender
3369          * @param int $message_id The message id of the comment
3370          *
3371          * @return bool Success
3372          */
3373         public static function store_comment_signature($item, $contact, $uprvkey, $message_id) {
3374
3375                 if ($uprvkey == "") {
3376                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
3377                         return false;
3378                 }
3379
3380                 $contact["uprvkey"] = $uprvkey;
3381
3382                 $message = self::construct_comment($item, $contact);
3383                 $message["author_signature"] = self::signature($contact, $message);
3384
3385                 // In the future we will store the signature more flexible to support new fields.
3386                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3387                 // (We are transmitting this data here via DFRN)
3388                 $signed_text = $message["guid"].";".$message["parent_guid"].";".
3389                                 $message["text"].";".$message["diaspora_handle"];
3390
3391                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3392                         intval($message_id),
3393                         dbesc($signed_text),
3394                         dbesc($message["author_signature"]),
3395                         dbesc($message["diaspora_handle"])
3396                 );
3397
3398                 // This here will replace the lines above, once Diaspora changed its protocol
3399                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3400                 //      intval($message_id),
3401                 //      dbesc(json_encode($message))
3402                 //);
3403
3404                 logger('Stored diaspora comment signature');
3405                 return true;
3406         }
3407 }
3408 ?>