include/diaspora2.php

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