include/diaspora.php

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