include/diaspora.php

   1 <?php
   2 /**
   3  * @file include/diaspora.php
   4  * @brief The implementation of the diaspora protocol
   5  *
   6  * The new protocol is described here: http://diaspora.github.io/diaspora_federation/index.html
   7  * Currently this implementation here interprets the old and the new protocol and sends the old one.
   8  * This will change in the future.
   9  */
  10
  11 require_once("include/items.php");
  12 require_once("include/bb2diaspora.php");
  13 require_once("include/Scrape.php");
  14 require_once("include/Contact.php");
  15 require_once("include/Photo.php");
  16 require_once("include/socgraph.php");
  17 require_once("include/group.php");
  18 require_once("include/xml.php");
  19 require_once("include/datetime.php");
  20 require_once("include/queue_fn.php");
  21
  22 /**
  23  * @brief This class contain functions to create and send Diaspora XML files
  24  *
  25  */
  26 class diaspora {
  27
  28         /**
  29          * @brief Return a list of relay servers
  30          *
  31          * This is an experimental Diaspora feature.
  32          *
  33          * @return array of relay servers
  34          */
  35         public static function relay_list() {
  36
  37                 $serverdata = get_config("system", "relay_server");
  38                 if ($serverdata == "")
  39                         return array();
  40
  41                 $relay = array();
  42
  43                 $servers = explode(",", $serverdata);
  44
  45                 foreach($servers AS $server) {
  46                         $server = trim($server);
  47                         $batch = $server."/receive/public";
  48
  49                         $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  50
  51                         if (!$relais) {
  52                                 $addr = "relay@".str_replace("http://", "", normalise_link($server));
  53
  54                                 $r = q("INSERT INTO `contact` (`uid`, `created`, `name`, `nick`, `addr`, `url`, `nurl`, `batch`, `network`, `rel`, `blocked`, `pending`, `writable`, `name-date`, `uri-date`, `avatar-date`)
  55                                         VALUES (0, '%s', '%s', 'relay', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, '%s', '%s', '%s')",
  56                                         datetime_convert(),
  57                                         dbesc($addr),
  58                                         dbesc($addr),
  59                                         dbesc($server),
  60                                         dbesc(normalise_link($server)),
  61                                         dbesc($batch),
  62                                         dbesc(NETWORK_DIASPORA),
  63                                         intval(CONTACT_IS_FOLLOWER),
  64                                         dbesc(datetime_convert()),
  65                                         dbesc(datetime_convert()),
  66                                         dbesc(datetime_convert())
  67                                 );
  68
  69                                 $relais = q("SELECT `batch`, `id`, `name`,`network` FROM `contact` WHERE `uid` = 0 AND `batch` = '%s' LIMIT 1", dbesc($batch));
  70                                 if ($relais)
  71                                         $relay[] = $relais[0];
  72                         } else
  73                                 $relay[] = $relais[0];
  74                 }
  75
  76                 return $relay;
  77         }
  78
  79         /**
  80          * @brief repairs a signature that was double encoded
  81          *
  82          * The function is unused at the moment. It was copied from the old implementation.
  83          *
  84          * @param string $signature The signature
  85          * @param string $handle The handle of the signature owner
  86          * @param integer $level This value is only set inside this function to avoid endless loops
  87          *
  88          * @return string the repaired signature
  89          */
  90         private function repair_signature($signature, $handle = "", $level = 1) {
  91
  92                 if ($signature == "")
  93                         return ($signature);
  94
  95                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
  96                         $signature = base64_decode($signature);
  97                         logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
  98
  99                         // Do a recursive call to be able to fix even multiple levels
 100                         if ($level < 10)
 101                                 $signature = self::repair_signature($signature, $handle, ++$level);
 102                 }
 103
 104                 return($signature);
 105         }
 106
 107         /**
 108          * @brief verify the envelope and return the verified data
 109          *
 110          * @param string $envelope The magic envelope
 111          *
 112          * @return string verified data
 113          */
 114         private function verify_magic_envelope($envelope) {
 115
 116                 $basedom = parse_xml_string($envelope, false);
 117
 118                 if (!is_object($basedom)) {
 119                         logger("Envelope is no XML file");
 120                         return false;
 121                 }
 122
 123                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 124
 125                 if (sizeof($children) == 0) {
 126                         logger("XML has no children");
 127                         return false;
 128                 }
 129
 130                 $handle = "";
 131
 132                 $data = base64url_decode($children->data);
 133                 $type = $children->data->attributes()->type[0];
 134
 135                 $encoding = $children->encoding;
 136
 137                 $alg = $children->alg;
 138
 139                 $sig = base64url_decode($children->sig);
 140                 $key_id = $children->sig->attributes()->key_id[0];
 141                 if ($key_id != "")
 142                         $handle = base64url_decode($key_id);
 143
 144                 $b64url_data = base64url_encode($data);
 145                 $msg = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
 146
 147                 $signable_data = $msg.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
 148
 149                 $key = self::key($handle);
 150
 151                 $verify = rsa_verify($signable_data, $sig, $key);
 152                 if (!$verify) {
 153                         logger('Message did not verify. Discarding.');
 154                         return false;
 155                 }
 156
 157                 return $data;
 158         }
 159
 160         /**
 161          * @brief: Decodes incoming Diaspora message
 162          *
 163          * @param array $importer Array of the importer user
 164          * @param string $xml urldecoded Diaspora salmon
 165          *
 166          * @return array
 167          * 'message' -> decoded Diaspora XML message
 168          * 'author' -> author diaspora handle
 169          * 'key' -> author public key (converted to pkcs#8)
 170          */
 171         public static function decode($importer, $xml) {
 172
 173                 $public = false;
 174                 $basedom = parse_xml_string($xml);
 175
 176                 if (!is_object($basedom))
 177                         return false;
 178
 179                 $children = $basedom->children('https://joindiaspora.com/protocol');
 180
 181                 if($children->header) {
 182                         $public = true;
 183                         $author_link = str_replace('acct:','',$children->header->author_id);
 184                 } else {
 185
 186                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 187
 188                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 189                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 190
 191                         $outer_key_bundle = '';
 192                         openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
 193
 194                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 195
 196                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 197                         $outer_key = base64_decode($j_outer_key_bundle->key);
 198
 199                         $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);
 200
 201
 202                         $decrypted = pkcs5_unpad($decrypted);
 203
 204                         logger('decrypted: '.$decrypted, LOGGER_DEBUG);
 205                         $idom = parse_xml_string($decrypted,false);
 206
 207                         $inner_iv = base64_decode($idom->iv);
 208                         $inner_aes_key = base64_decode($idom->aes_key);
 209
 210                         $author_link = str_replace('acct:','',$idom->author_id);
 211                 }
 212
 213                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 214
 215                 // figure out where in the DOM tree our data is hiding
 216
 217                 if($dom->provenance->data)
 218                         $base = $dom->provenance;
 219                 elseif($dom->env->data)
 220                         $base = $dom->env;
 221                 elseif($dom->data)
 222                         $base = $dom;
 223
 224                 if (!$base) {
 225                         logger('unable to locate salmon data in xml');
 226                         http_status_exit(400);
 227                 }
 228
 229
 230                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 231                 $signature = base64url_decode($base->sig);
 232
 233                 // unpack the  data
 234
 235                 // strip whitespace so our data element will return to one big base64 blob
 236                 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
 237
 238
 239                 // stash away some other stuff for later
 240
 241                 $type = $base->data[0]->attributes()->type[0];
 242                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 243                 $encoding = $base->encoding;
 244                 $alg = $base->alg;
 245
 246
 247                 $signed_data = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
 248
 249
 250                 // decode the data
 251                 $data = base64url_decode($data);
 252
 253
 254                 if($public)
 255                         $inner_decrypted = $data;
 256                 else {
 257
 258                         // Decode the encrypted blob
 259
 260                         $inner_encrypted = base64_decode($data);
 261                         $inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
 262                         $inner_decrypted = pkcs5_unpad($inner_decrypted);
 263                 }
 264
 265                 if (!$author_link) {
 266                         logger('Could not retrieve author URI.');
 267                         http_status_exit(400);
 268                 }
 269                 // Once we have the author URI, go to the web and try to find their public key
 270                 // (first this will look it up locally if it is in the fcontact cache)
 271                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 272
 273                 logger('Fetching key for '.$author_link);
 274                 $key = self::key($author_link);
 275
 276                 if (!$key) {
 277                         logger('Could not retrieve author key.');
 278                         http_status_exit(400);
 279                 }
 280
 281                 $verify = rsa_verify($signed_data,$signature,$key);
 282
 283                 if (!$verify) {
 284                         logger('Message did not verify. Discarding.');
 285                         http_status_exit(400);
 286                 }
 287
 288                 logger('Message verified.');
 289
 290                 return array('message' => (string)$inner_decrypted,
 291                                 'author' => unxmlify($author_link),
 292                                 'key' => (string)$key);
 293         }
 294
 295
 296         /**
 297          * @brief Dispatches public messages and find the fitting receivers
 298          *
 299          * @param array $msg The post that will be dispatched
 300          *
 301          * @return int The message id of the generated message, "true" or "false" if there was an error
 302          */
 303         public static function dispatch_public($msg) {
 304
 305                 $enabled = intval(get_config("system", "diaspora_enabled"));
 306                 if (!$enabled) {
 307                         logger("diaspora is disabled");
 308                         return false;
 309                 }
 310
 311                 // Use a dummy importer to import the data for the public copy
 312                 $importer = array("uid" => 0, "page-flags" => PAGE_FREELOVE);
 313                 $message_id = self::dispatch($importer,$msg);
 314
 315                 // Now distribute it to the followers
 316                 $r = q("SELECT `user`.* FROM `user` WHERE `user`.`uid` IN
 317                         (SELECT `contact`.`uid` FROM `contact` WHERE `contact`.`network` = '%s' AND `contact`.`addr` = '%s')
 318                         AND NOT `account_expired` AND NOT `account_removed`",
 319                         dbesc(NETWORK_DIASPORA),
 320                         dbesc($msg["author"])
 321                 );
 322                 if($r) {
 323                         foreach($r as $rr) {
 324                                 logger("delivering to: ".$rr["username"]);
 325                                 self::dispatch($rr,$msg);
 326                         }
 327                 } else
 328                         logger("No subscribers for ".$msg["author"]." ".print_r($msg, true));
 329
 330                 return $message_id;
 331         }
 332
 333         /**
 334          * @brief Dispatches the different message types to the different functions
 335          *
 336          * @param array $importer Array of the importer user
 337          * @param array $msg The post that will be dispatched
 338          *
 339          * @return int The message id of the generated message, "true" or "false" if there was an error
 340          */
 341         public static function dispatch($importer, $msg) {
 342
 343                 // The sender is the handle of the contact that sent the message.
 344                 // This will often be different with relayed messages (for example "like" and "comment")
 345                 $sender = $msg["author"];
 346
 347                 if (!diaspora::valid_posting($msg, $fields)) {
 348                         logger("Invalid posting");
 349                         return false;
 350                 }
 351
 352                 $type = $fields->getName();
 353
 354                 logger("Received message type ".$type." from ".$sender." for user ".$importer["uid"], LOGGER_DEBUG);
 355
 356                 switch ($type) {
 357                         case "account_deletion":
 358                                 return self::receive_account_deletion($importer, $fields);
 359
 360                         case "comment":
 361                                 return self::receive_comment($importer, $sender, $fields, $msg["message"]);
 362
 363                         case "contact":
 364                                 return self::receive_contact_request($importer, $fields);
 365
 366                         case "conversation":
 367                                 return self::receive_conversation($importer, $msg, $fields);
 368
 369                         case "like":
 370                                 return self::receive_like($importer, $sender, $fields);
 371
 372                         case "message":
 373                                 return self::receive_message($importer, $fields);
 374
 375                         case "participation": // Not implemented
 376                                 return self::receive_participation($importer, $fields);
 377
 378                         case "photo": // Not implemented
 379                                 return self::receive_photo($importer, $fields);
 380
 381                         case "poll_participation": // Not implemented
 382                                 return self::receive_poll_participation($importer, $fields);
 383
 384                         case "profile":
 385                                 return self::receive_profile($importer, $fields);
 386
 387                         case "reshare":
 388                                 return self::receive_reshare($importer, $fields, $msg["message"]);
 389
 390                         case "retraction":
 391                                 return self::receive_retraction($importer, $sender, $fields);
 392
 393                         case "status_message":
 394                                 return self::receive_status_message($importer, $fields, $msg["message"]);
 395
 396                         default:
 397                                 logger("Unknown message type ".$type);
 398                                 return false;
 399                 }
 400
 401                 return true;
 402         }
 403
 404         /**
 405          * @brief Checks if a posting is valid and fetches the data fields.
 406          *
 407          * This function does not only check the signature.
 408          * It also does the conversion between the old and the new diaspora format.
 409          *
 410          * @param array $msg Array with the XML, the sender handle and the sender signature
 411          * @param object $fields SimpleXML object that contains the posting when it is valid
 412          *
 413          * @return bool Is the posting valid?
 414          */
 415         private function valid_posting($msg, &$fields) {
 416
 417                 $data = parse_xml_string($msg["message"], false);
 418
 419                 if (!is_object($data)) {
 420                         logger("No valid XML ".$msg["message"], LOGGER_DEBUG);
 421                         return false;
 422                 }
 423
 424                 $first_child = $data->getName();
 425
 426                 // Is this the new or the old version?
 427                 if ($data->getName() == "XML") {
 428                         $oldXML = true;
 429                         foreach ($data->post->children() as $child)
 430                                 $element = $child;
 431                 } else {
 432                         $oldXML = false;
 433                         $element = $data;
 434                 }
 435
 436                 $type = $element->getName();
 437                 $orig_type = $type;
 438
 439                 logger("Got message type ".$type.": ".$msg["message"], LOGGER_DATA);
 440
 441                 // All retractions are handled identically from now on.
 442                 // In the new version there will only be "retraction".
 443                 if (in_array($type, array("signed_retraction", "relayable_retraction")))
 444                         $type = "retraction";
 445
 446                 if ($type == "request")
 447                         $type = "contact";
 448
 449                 $fields = new SimpleXMLElement("<".$type."/>");
 450
 451                 $signed_data = "";
 452
 453                 foreach ($element->children() AS $fieldname => $entry) {
 454                         if ($oldXML) {
 455                                 // Translation for the old XML structure
 456                                 if ($fieldname == "diaspora_handle")
 457                                         $fieldname = "author";
 458
 459                                 if ($fieldname == "participant_handles")
 460                                         $fieldname = "participants";
 461
 462                                 if (in_array($type, array("like", "participation"))) {
 463                                         if ($fieldname == "target_type")
 464                                                 $fieldname = "parent_type";
 465                                 }
 466
 467                                 if ($fieldname == "sender_handle")
 468                                         $fieldname = "author";
 469
 470                                 if ($fieldname == "recipient_handle")
 471                                         $fieldname = "recipient";
 472
 473                                 if ($fieldname == "root_diaspora_id")
 474                                         $fieldname = "root_author";
 475
 476                                 if ($type == "retraction") {
 477                                         if ($fieldname == "post_guid")
 478                                                 $fieldname = "target_guid";
 479
 480                                         if ($fieldname == "type")
 481                                                 $fieldname = "target_type";
 482                                 }
 483                         }
 484
 485                         if (($fieldname == "author_signature") AND ($entry != ""))
 486                                 $author_signature = base64_decode($entry);
 487                         elseif (($fieldname == "parent_author_signature") AND ($entry != ""))
 488                                 $parent_author_signature = base64_decode($entry);
 489                         elseif (!in_array($fieldname, array("author_signature", "parent_author_signature", "target_author_signature"))) {
 490                                 if ($signed_data != "") {
 491                                         $signed_data .= ";";
 492                                         $signed_data_parent .= ";";
 493                                 }
 494
 495                                 $signed_data .= $entry;
 496                         }
 497                         if (!in_array($fieldname, array("parent_author_signature", "target_author_signature")) OR
 498                                 ($orig_type == "relayable_retraction"))
 499                                 xml::copy($entry, $fields, $fieldname);
 500                 }
 501
 502                 // This is something that shouldn't happen at all.
 503                 if (in_array($type, array("status_message", "reshare", "profile")))
 504                         if ($msg["author"] != $fields->author) {
 505                                 logger("Message handle is not the same as envelope sender. Quitting this message.");
 506                                 return false;
 507                         }
 508
 509                 // Only some message types have signatures. So we quit here for the other types.
 510                 if (!in_array($type, array("comment", "message", "like")))
 511                         return true;
 512
 513                 // No author_signature? This is a must, so we quit.
 514                 if (!isset($author_signature)) {
 515                         logger("No author signature for type ".$type." - Message: ".$msg["message"], LOGGER_DEBUG);
 516                         return false;
 517                 }
 518
 519                 if (isset($parent_author_signature)) {
 520                         $key = self::key($msg["author"]);
 521
 522                         if (!rsa_verify($signed_data, $parent_author_signature, $key, "sha256")) {
 523                                 logger("No valid parent author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, LOGGER_DEBUG);
 524                                 return false;
 525                         }
 526                 }
 527
 528                 $key = self::key($fields->author);
 529
 530                 if (!rsa_verify($signed_data, $author_signature, $key, "sha256")) {
 531                         logger("No valid author signature for author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, LOGGER_DEBUG);
 532                         return false;
 533                 } else
 534                         return true;
 535         }
 536
 537         /**
 538          * @brief Fetches the public key for a given handle
 539          *
 540          * @param string $handle The handle
 541          *
 542          * @return string The public key
 543          */
 544         private function key($handle) {
 545                 $handle = strval($handle);
 546
 547                 logger("Fetching diaspora key for: ".$handle);
 548
 549                 $r = self::person_by_handle($handle);
 550                 if($r)
 551                         return $r["pubkey"];
 552
 553                 return "";
 554         }
 555
 556         /**
 557          * @brief Fetches data for a given handle
 558          *
 559          * @param string $handle The handle
 560          *
 561          * @return array the queried data
 562          */
 563         private function person_by_handle($handle) {
 564
 565                 $r = q("SELECT * FROM `fcontact` WHERE `network` = '%s' AND `addr` = '%s' LIMIT 1",
 566                         dbesc(NETWORK_DIASPORA),
 567                         dbesc($handle)
 568                 );
 569                 if ($r) {
 570                         $person = $r[0];
 571                         logger("In cache ".print_r($r,true), LOGGER_DEBUG);
 572
 573                         // update record occasionally so it doesn't get stale
 574                         $d = strtotime($person["updated"]." +00:00");
 575                         if ($d < strtotime("now - 14 days"))
 576                                 $update = true;
 577
 578                         if ($person["guid"] == "")
 579                                 $update = true;
 580                 }
 581
 582                 if (!$person OR $update) {
 583                         logger("create or refresh", LOGGER_DEBUG);
 584                         $r = probe_url($handle, PROBE_DIASPORA);
 585
 586                         // Note that Friendica contacts will return a "Diaspora person"
 587                         // if Diaspora connectivity is enabled on their server
 588                         if ($r AND ($r["network"] === NETWORK_DIASPORA)) {
 589                                 self::add_fcontact($r, $update);
 590                                 $person = $r;
 591                         }
 592                 }
 593                 return $person;
 594         }
 595
 596         /**
 597          * @brief Updates the fcontact table
 598          *
 599          * @param array $arr The fcontact data
 600          * @param bool $update Update or insert?
 601          *
 602          * @return string The id of the fcontact entry
 603          */
 604         private function add_fcontact($arr, $update = false) {
 605
 606                 if($update) {
 607                         $r = q("UPDATE `fcontact` SET
 608                                         `name` = '%s',
 609                                         `photo` = '%s',
 610                                         `request` = '%s',
 611                                         `nick` = '%s',
 612                                         `addr` = '%s',
 613                                         `guid` = '%s',
 614                                         `batch` = '%s',
 615                                         `notify` = '%s',
 616                                         `poll` = '%s',
 617                                         `confirm` = '%s',
 618                                         `alias` = '%s',
 619                                         `pubkey` = '%s',
 620                                         `updated` = '%s'
 621                                 WHERE `url` = '%s' AND `network` = '%s'",
 622                                         dbesc($arr["name"]),
 623                                         dbesc($arr["photo"]),
 624                                         dbesc($arr["request"]),
 625                                         dbesc($arr["nick"]),
 626                                         dbesc(strtolower($arr["addr"])),
 627                                         dbesc($arr["guid"]),
 628                                         dbesc($arr["batch"]),
 629                                         dbesc($arr["notify"]),
 630                                         dbesc($arr["poll"]),
 631                                         dbesc($arr["confirm"]),
 632                                         dbesc($arr["alias"]),
 633                                         dbesc($arr["pubkey"]),
 634                                         dbesc(datetime_convert()),
 635                                         dbesc($arr["url"]),
 636                                         dbesc($arr["network"])
 637                                 );
 638                 } else {
 639                         $r = q("INSERT INTO `fcontact` (`url`,`name`,`photo`,`request`,`nick`,`addr`, `guid`,
 640                                         `batch`, `notify`,`poll`,`confirm`,`network`,`alias`,`pubkey`,`updated`)
 641                                 VALUES ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')",
 642                                         dbesc($arr["url"]),
 643                                         dbesc($arr["name"]),
 644                                         dbesc($arr["photo"]),
 645                                         dbesc($arr["request"]),
 646                                         dbesc($arr["nick"]),
 647                                         dbesc($arr["addr"]),
 648                                         dbesc($arr["guid"]),
 649                                         dbesc($arr["batch"]),
 650                                         dbesc($arr["notify"]),
 651                                         dbesc($arr["poll"]),
 652                                         dbesc($arr["confirm"]),
 653                                         dbesc($arr["network"]),
 654                                         dbesc($arr["alias"]),
 655                                         dbesc($arr["pubkey"]),
 656                                         dbesc(datetime_convert())
 657                                 );
 658                 }
 659
 660                 return $r;
 661         }
 662
 663         /**
 664          * @brief get a handle (user@domain.tld) from a given contact id or gcontact id
 665          *
 666          * @param int $contact_id The id in the contact table
 667          * @param int $gcontact_id The id in the gcontact table
 668          *
 669          * @return string the handle
 670          */
 671         public static function handle_from_contact($contact_id, $gcontact_id = 0) {
 672                 $handle = False;
 673
 674                 logger("contact id is ".$contact_id." - gcontact id is ".$gcontact_id, LOGGER_DEBUG);
 675
 676                 if ($gcontact_id != 0) {
 677                         $r = q("SELECT `addr` FROM `gcontact` WHERE `id` = %d AND `addr` != ''",
 678                                 intval($gcontact_id));
 679                         if ($r)
 680                                 return strtolower($r[0]["addr"]);
 681                 }
 682
 683                 $r = q("SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
 684                         intval($contact_id));
 685                 if ($r) {
 686                         $contact = $r[0];
 687
 688                         logger("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], LOGGER_DEBUG);
 689
 690                         if($contact['addr'] != "")
 691                                 $handle = $contact['addr'];
 692                         else {
 693                                 $baseurl_start = strpos($contact['url'],'://') + 3;
 694                                 $baseurl_length = strpos($contact['url'],'/profile') - $baseurl_start; // allows installations in a subdirectory--not sure how Diaspora will handle
 695                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
 696                                 $handle = $contact['nick'].'@'.$baseurl;
 697                         }
 698                 }
 699
 700                 return strtolower($handle);
 701         }
 702
 703         /**
 704          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora
 705          * fcontact id or guid
 706          *
 707          * @param mixed $contact_id Either the numeric id or the string guid
 708          *
 709          * @return string the url
 710          */
 711         public static function url_from_fcontact($contact_id) {
 712                 $handle = False;
 713
 714                 logger("fcontact id is ".$contact_id, LOGGER_DEBUG);
 715
 716                 if (is_numeric($contact_id)) {
 717                         $r = q("SELECT `url` FROM `fcontact` WHERE `id` = %d AND `network` = 'dspr' `url` != ''",
 718                                 intval($contact_id));
 719                 }else {
 720                         $r = q("SELECT `url` FROM `fcontact` WHERE `guid` = '%s' AND `network` = 'dspr' AND `url` != ''",
 721                                 $contact_id);
 722                 }
 723                 if ($r) {
 724                         return $r[0]['url'];
 725                 }
 726
 727                 return null;
 728         }
 729
 730         /**
 731          * @brief Get a contact id for a given handle
 732          *
 733          * @param int $uid The user id
 734          * @param string $handle The handle in the format user@domain.tld
 735          *
 736          * @return The contact id
 737          */
 738         private function contact_by_handle($uid, $handle) {
 739                 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `addr` = '%s' LIMIT 1",
 740                         intval($uid),
 741                         dbesc($handle)
 742                 );
 743
 744                 if ($r)
 745                         return $r[0];
 746
 747                 $handle_parts = explode("@", $handle);
 748                 $nurl_sql = "%%://".$handle_parts[1]."%%/profile/".$handle_parts[0];
 749                 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `nurl` LIKE '%s' LIMIT 1",
 750                         dbesc(NETWORK_DFRN),
 751                         intval($uid),
 752                         dbesc($nurl_sql)
 753                 );
 754                 if($r)
 755                         return $r[0];
 756
 757                 return false;
 758         }
 759
 760         /**
 761          * @brief Check if posting is allowed for this contact
 762          *
 763          * @param array $importer Array of the importer user
 764          * @param array $contact The contact that is checked
 765          * @param bool $is_comment Is the check for a comment?
 766          *
 767          * @return bool is the contact allowed to post?
 768          */
 769         private function post_allow($importer, $contact, $is_comment = false) {
 770
 771                 // perhaps we were already sharing with this person. Now they're sharing with us.
 772                 // That makes us friends.
 773                 // Normally this should have handled by getting a request - but this could get lost
 774                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
 775                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
 776                                 intval(CONTACT_IS_FRIEND),
 777                                 intval($contact["id"]),
 778                                 intval($importer["uid"])
 779                         );
 780                         $contact["rel"] = CONTACT_IS_FRIEND;
 781                         logger("defining user ".$contact["nick"]." as friend");
 782                 }
 783
 784                 if(($contact["blocked"]) || ($contact["readonly"]) || ($contact["archive"]))
 785                         return false;
 786                 if($contact["rel"] == CONTACT_IS_SHARING || $contact["rel"] == CONTACT_IS_FRIEND)
 787                         return true;
 788                 if($contact["rel"] == CONTACT_IS_FOLLOWER)
 789                         if(($importer["page-flags"] == PAGE_COMMUNITY) OR $is_comment)
 790                                 return true;
 791
 792                 // Messages for the global users are always accepted
 793                 if ($importer["uid"] == 0)
 794                         return true;
 795
 796                 return false;
 797         }
 798
 799         /**
 800          * @brief Fetches the contact id for a handle and checks if posting is allowed
 801          *
 802          * @param array $importer Array of the importer user
 803          * @param string $handle The checked handle in the format user@domain.tld
 804          * @param bool $is_comment Is the check for a comment?
 805          *
 806          * @return array The contact data
 807          */
 808         private function allowed_contact_by_handle($importer, $handle, $is_comment = false) {
 809                 $contact = self::contact_by_handle($importer["uid"], $handle);
 810                 if (!$contact) {
 811                         logger("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
 812                         return false;
 813                 }
 814
 815                 if (!self::post_allow($importer, $contact, $is_comment)) {
 816                         logger("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
 817                         return false;
 818                 }
 819                 return $contact;
 820         }
 821
 822         /**
 823          * @brief Does the message already exists on the system?
 824          *
 825          * @param int $uid The user id
 826          * @param string $guid The guid of the message
 827          *
 828          * @return int|bool message id if the message already was stored into the system - or false.
 829          */
 830         private function message_exists($uid, $guid) {
 831                 $r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
 832                         intval($uid),
 833                         dbesc($guid)
 834                 );
 835
 836                 if($r) {
 837                         logger("message ".$guid." already exists for user ".$uid);
 838                         return $r[0]["id"];
 839                 }
 840
 841                 return false;
 842         }
 843
 844         /**
 845          * @brief Checks for links to posts in a message
 846          *
 847          * @param array $item The item array
 848          */
 849         private function fetch_guid($item) {
 850                 preg_replace_callback("&\[url=/posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
 851                         function ($match) use ($item){
 852                                 return(self::fetch_guid_sub($match, $item));
 853                         },$item["body"]);
 854         }
 855
 856         /**
 857          * @brief Checks for relative /people/* links to match local contacts or
 858          * prepends the remote host taken from the author link
 859          *
 860          * @param string $body The item body to replace links from
 861          * @param string $author_link The author link for missing local contact fallback
 862          */
 863         public function replace_people_guid($body, $author_link) {
 864                 $return = preg_replace_callback("&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
 865                         function ($match) use ($author_link){
 866                                 // $match
 867                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
 868                                 // 1 => '0123456789abcdef'
 869                                 // 2 => 'Foo Bar'
 870                                 $handle = self::url_from_fcontact($match[1]);
 871
 872                                 if ($handle) {
 873                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
 874                                 }else {
 875                                         // No local match, restoring absolute remote URL from author scheme and host
 876                                         $author_url = parse_url($author_link);
 877                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
 878                                 }
 879
 880                                 return $return;
 881
 882                         }, $body);
 883
 884                 return $return;
 885         }
 886
 887         /**
 888          * @brief sub function of "fetch_guid" which checks for links in messages
 889          *
 890          * @param array $match array containing a link that has to be checked for a message link
 891          * @param array $item The item array
 892          */
 893         private function fetch_guid_sub($match, $item) {
 894                 if (!self::store_by_guid($match[1], $item["author-link"]))
 895                         self::store_by_guid($match[1], $item["owner-link"]);
 896         }
 897
 898         /**
 899          * @brief Fetches an item with a given guid from a given server
 900          *
 901          * @param string $guid the message guid
 902          * @param string $server The server address
 903          * @param int $uid The user id of the user
 904          *
 905          * @return int the message id of the stored message or false
 906          */
 907         private function store_by_guid($guid, $server, $uid = 0) {
 908                 $serverparts = parse_url($server);
 909                 $server = $serverparts["scheme"]."://".$serverparts["host"];
 910
 911                 logger("Trying to fetch item ".$guid." from ".$server, LOGGER_DEBUG);
 912
 913                 $msg = self::message($guid, $server);
 914
 915                 if (!$msg)
 916                         return false;
 917
 918                 logger("Successfully fetched item ".$guid." from ".$server, LOGGER_DEBUG);
 919
 920                 // Now call the dispatcher
 921                 return self::dispatch_public($msg);
 922         }
 923
 924         /**
 925          * @brief Fetches a message from a server
 926          *
 927          * @param string $guid message guid
 928          * @param string $server The url of the server
 929          * @param int $level Endless loop prevention
 930          *
 931          * @return array
 932          *      'message' => The message XML
 933          *      'author' => The author handle
 934          *      'key' => The public key of the author
 935          */
 936         private function message($guid, $server, $level = 0) {
 937
 938                 if ($level > 5)
 939                         return false;
 940
 941                 // This will work for new Diaspora servers and Friendica servers from 3.5
 942                 $source_url = $server."/fetch/post/".$guid;
 943                 logger("Fetch post from ".$source_url, LOGGER_DEBUG);
 944
 945                 $envelope = fetch_url($source_url);
 946                 if($envelope) {
 947                         logger("Envelope was fetched.", LOGGER_DEBUG);
 948                         $x = self::verify_magic_envelope($envelope);
 949                         if (!$x)
 950                                 logger("Envelope could not be verified.", LOGGER_DEBUG);
 951                         else
 952                                 logger("Envelope was verified.", LOGGER_DEBUG);
 953                 } else
 954                         $x = false;
 955
 956                 // This will work for older Diaspora and Friendica servers
 957                 if (!$x) {
 958                         $source_url = $server."/p/".$guid.".xml";
 959                         logger("Fetch post from ".$source_url, LOGGER_DEBUG);
 960
 961                         $x = fetch_url($source_url);
 962                         if(!$x)
 963                                 return false;
 964                 }
 965
 966                 $source_xml = parse_xml_string($x, false);
 967
 968                 if (!is_object($source_xml))
 969                         return false;
 970
 971                 if ($source_xml->post->reshare) {
 972                         // Reshare of a reshare - old Diaspora version
 973                         logger("Message is a reshare", LOGGER_DEBUG);
 974                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
 975                 } elseif ($source_xml->getName() == "reshare") {
 976                         // Reshare of a reshare - new Diaspora version
 977                         logger("Message is a new reshare", LOGGER_DEBUG);
 978                         return self::message($source_xml->root_guid, $server, ++$level);
 979                 }
 980
 981                 $author = "";
 982
 983                 // Fetch the author - for the old and the new Diaspora version
 984                 if ($source_xml->post->status_message->diaspora_handle)
 985                         $author = (string)$source_xml->post->status_message->diaspora_handle;
 986                 elseif ($source_xml->author AND ($source_xml->getName() == "status_message"))
 987                         $author = (string)$source_xml->author;
 988
 989                 // If this isn't a "status_message" then quit
 990                 if (!$author) {
 991                         logger("Message doesn't seem to be a status message", LOGGER_DEBUG);
 992                         return false;
 993                 }
 994
 995                 $msg = array("message" => $x, "author" => $author);
 996
 997                 $msg["key"] = self::key($msg["author"]);
 998
 999                 return $msg;
1000         }
1001
1002         /**
1003          * @brief Fetches the item record of a given guid
1004          *
1005          * @param int $uid The user id
1006          * @param string $guid message guid
1007          * @param string $author The handle of the item
1008          * @param array $contact The contact of the item owner
1009          *
1010          * @return array the item record
1011          */
1012         private function parent_item($uid, $guid, $author, $contact) {
1013                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
1014                                 `author-name`, `author-link`, `author-avatar`,
1015                                 `owner-name`, `owner-link`, `owner-avatar`
1016                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1017                         intval($uid), dbesc($guid));
1018
1019                 if(!$r) {
1020                         $result = self::store_by_guid($guid, $contact["url"], $uid);
1021
1022                         if (!$result) {
1023                                 $person = self::person_by_handle($author);
1024                                 $result = self::store_by_guid($guid, $person["url"], $uid);
1025                         }
1026
1027                         if ($result) {
1028                                 logger("Fetched missing item ".$guid." - result: ".$result, LOGGER_DEBUG);
1029
1030                                 $r = q("SELECT `id`, `body`, `wall`, `uri`, `private`, `origin`,
1031                                                 `author-name`, `author-link`, `author-avatar`,
1032                                                 `owner-name`, `owner-link`, `owner-avatar`
1033                                         FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1034                                         intval($uid), dbesc($guid));
1035                         }
1036                 }
1037
1038                 if (!$r) {
1039                         logger("parent item not found: parent: ".$guid." - user: ".$uid);
1040                         return false;
1041                 } else {
1042                         logger("parent item found: parent: ".$guid." - user: ".$uid);
1043                         return $r[0];
1044                 }
1045         }
1046
1047         /**
1048          * @brief returns contact details
1049          *
1050          * @param array $contact The default contact if the person isn't found
1051          * @param array $person The record of the person
1052          * @param int $uid The user id
1053          *
1054          * @return array
1055          *      'cid' => contact id
1056          *      'network' => network type
1057          */
1058         private function author_contact_by_url($contact, $person, $uid) {
1059
1060                 $r = q("SELECT `id`, `network`, `url` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d LIMIT 1",
1061                         dbesc(normalise_link($person["url"])), intval($uid));
1062                 if ($r) {
1063                         $cid = $r[0]["id"];
1064                         $network = $r[0]["network"];
1065
1066                         // We are receiving content from a user that is about to be terminated
1067                         // This means the user is vital, so we remove a possible termination date.
1068                         unmark_for_death($contact);
1069                 } else {
1070                         $cid = $contact["id"];
1071                         $network = NETWORK_DIASPORA;
1072                 }
1073
1074                 return array("cid" => $cid, "network" => $network);
1075         }
1076
1077         /**
1078          * @brief Is the profile a hubzilla profile?
1079          *
1080          * @param string $url The profile link
1081          *
1082          * @return bool is it a hubzilla server?
1083          */
1084         public static function is_redmatrix($url) {
1085                 return(strstr($url, "/channel/"));
1086         }
1087
1088         /**
1089          * @brief Generate a post link with a given handle and message guid
1090          *
1091          * @param string $addr The user handle
1092          * @param string $guid message guid
1093          *
1094          * @return string the post link
1095          */
1096         private function plink($addr, $guid) {
1097                 $r = q("SELECT `url`, `nick`, `network` FROM `fcontact` WHERE `addr`='%s' LIMIT 1", dbesc($addr));
1098
1099                 // Fallback
1100                 if (!$r)
1101                         return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1102
1103                 // Friendica contacts are often detected as Diaspora contacts in the "fcontact" table
1104                 // So we try another way as well.
1105                 $s = q("SELECT `network` FROM `gcontact` WHERE `nurl`='%s' LIMIT 1", dbesc(normalise_link($r[0]["url"])));
1106                 if ($s)
1107                         $r[0]["network"] = $s[0]["network"];
1108
1109                 if ($r[0]["network"] == NETWORK_DFRN)
1110                         return(str_replace("/profile/".$r[0]["nick"]."/", "/display/".$guid, $r[0]["url"]."/"));
1111
1112                 if (self::is_redmatrix($r[0]["url"]))
1113                         return $r[0]["url"]."/?f=&mid=".$guid;
1114
1115                 return "https://".substr($addr,strpos($addr,"@")+1)."/posts/".$guid;
1116         }
1117
1118         /**
1119          * @brief Processes an account deletion
1120          *
1121          * @param array $importer Array of the importer user
1122          * @param object $data The message object
1123          *
1124          * @return bool Success
1125          */
1126         private function receive_account_deletion($importer, $data) {
1127
1128                 /// @todo Account deletion should remove the contact from the global contacts as well
1129
1130                 $author = notags(unxmlify($data->author));
1131
1132                 $contact = self::contact_by_handle($importer["uid"], $author);
1133                 if (!$contact) {
1134                         logger("cannot find contact for author: ".$author);
1135                         return false;
1136                 }
1137
1138                 // We now remove the contact
1139                 contact_remove($contact["id"]);
1140                 return true;
1141         }
1142
1143         /**
1144          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1145          *
1146          * @param string $author Author handle
1147          * @param string $guid Message guid
1148          *
1149          * @return string The constructed uri or the one from our database
1150          */
1151         private function get_uri_from_guid($author, $guid) {
1152
1153                 $r = q("SELECT `uri` FROM `item` WHERE `guid` = '%s' LIMIT 1", dbesc($guid));
1154                 if ($r)
1155                         return $r[0]["uri"];
1156                 else
1157                         return $author.":".$guid;
1158         }
1159
1160         /**
1161          * @brief Processes an incoming comment
1162          *
1163          * @param array $importer Array of the importer user
1164          * @param string $sender The sender of the message
1165          * @param object $data The message object
1166          * @param string $xml The original XML of the message
1167          *
1168          * @return int The message id of the generated comment or "false" if there was an error
1169          */
1170         private function receive_comment($importer, $sender, $data, $xml) {
1171                 $guid = notags(unxmlify($data->guid));
1172                 $parent_guid = notags(unxmlify($data->parent_guid));
1173                 $text = unxmlify($data->text);
1174                 $author = notags(unxmlify($data->author));
1175
1176                 if (isset($data->created_at))
1177                         $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1178                 else
1179                         $created_at = datetime_convert();
1180
1181                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1182                 if (!$contact)
1183                         return false;
1184
1185                 $message_id = self::message_exists($importer["uid"], $guid);
1186                 if ($message_id)
1187                         return $message_id;
1188
1189                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1190                 if (!$parent_item)
1191                         return false;
1192
1193                 $person = self::person_by_handle($author);
1194                 if (!is_array($person)) {
1195                         logger("unable to find author details");
1196                         return false;
1197                 }
1198
1199                 // Fetch the contact id - if we know this contact
1200                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1201
1202                 $datarray = array();
1203
1204                 $datarray["uid"] = $importer["uid"];
1205                 $datarray["contact-id"] = $author_contact["cid"];
1206                 $datarray["network"]  = $author_contact["network"];
1207
1208                 $datarray["author-name"] = $person["name"];
1209                 $datarray["author-link"] = $person["url"];
1210                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1211
1212                 $datarray["owner-name"] = $contact["name"];
1213                 $datarray["owner-link"] = $contact["url"];
1214                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1215
1216                 $datarray["guid"] = $guid;
1217                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1218
1219                 $datarray["type"] = "remote-comment";
1220                 $datarray["verb"] = ACTIVITY_POST;
1221                 $datarray["gravity"] = GRAVITY_COMMENT;
1222                 $datarray["parent-uri"] = $parent_item["uri"];
1223
1224                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1225                 $datarray["object"] = $xml;
1226
1227                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1228
1229                 $datarray["body"] = diaspora2bb($text);
1230
1231                 $datarray["body"] = self::replace_people_gui($datarray);
1232
1233                 self::fetch_guid($datarray);
1234
1235                 $message_id = item_store($datarray);
1236
1237                 if ($message_id)
1238                         logger("Stored comment ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1239
1240                 // If we are the origin of the parent we store the original data and notify our followers
1241                 if($message_id AND $parent_item["origin"]) {
1242
1243                         // Formerly we stored the signed text, the signature and the author in different fields.
1244                         // We now store the raw data so that we are more flexible.
1245                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1246                                 intval($message_id),
1247                                 dbesc(json_encode($data))
1248                         );
1249
1250                         // notify others
1251                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1252                 }
1253
1254                 return $message_id;
1255         }
1256
1257         /**
1258          * @brief processes and stores private messages
1259          *
1260          * @param array $importer Array of the importer user
1261          * @param array $contact The contact of the message
1262          * @param object $data The message object
1263          * @param array $msg Array of the processed message, author handle and key
1264          * @param object $mesg The private message
1265          * @param array $conversation The conversation record to which this message belongs
1266          *
1267          * @return bool "true" if it was successful
1268          */
1269         private function receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation) {
1270                 $guid = notags(unxmlify($data->guid));
1271                 $subject = notags(unxmlify($data->subject));
1272                 $author = notags(unxmlify($data->author));
1273
1274                 $reply = 0;
1275
1276                 $msg_guid = notags(unxmlify($mesg->guid));
1277                 $msg_parent_guid = notags(unxmlify($mesg->parent_guid));
1278                 $msg_parent_author_signature = notags(unxmlify($mesg->parent_author_signature));
1279                 $msg_author_signature = notags(unxmlify($mesg->author_signature));
1280                 $msg_text = unxmlify($mesg->text);
1281                 $msg_created_at = datetime_convert("UTC", "UTC", notags(unxmlify($mesg->created_at)));
1282
1283                 // "diaspora_handle" is the element name from the old version
1284                 // "author" is the element name from the new version
1285                 if ($mesg->author)
1286                         $msg_author = notags(unxmlify($mesg->author));
1287                 elseif ($mesg->diaspora_handle)
1288                         $msg_author = notags(unxmlify($mesg->diaspora_handle));
1289                 else
1290                         return false;
1291
1292                 $msg_conversation_guid = notags(unxmlify($mesg->conversation_guid));
1293
1294                 if($msg_conversation_guid != $guid) {
1295                         logger("message conversation guid does not belong to the current conversation.");
1296                         return false;
1297                 }
1298
1299                 $body = diaspora2bb($msg_text);
1300                 $message_uri = $msg_author.":".$msg_guid;
1301
1302                 $author_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1303
1304                 $author_signature = base64_decode($msg_author_signature);
1305
1306                 if(strcasecmp($msg_author,$msg["author"]) == 0) {
1307                         $person = $contact;
1308                         $key = $msg["key"];
1309                 } else {
1310                         $person = self::person_by_handle($msg_author);
1311
1312                         if (is_array($person) && x($person, "pubkey"))
1313                                 $key = $person["pubkey"];
1314                         else {
1315                                 logger("unable to find author details");
1316                                         return false;
1317                         }
1318                 }
1319
1320                 if (!rsa_verify($author_signed_data, $author_signature, $key, "sha256")) {
1321                         logger("verification failed.");
1322                         return false;
1323                 }
1324
1325                 if($msg_parent_author_signature) {
1326                         $owner_signed_data = $msg_guid.";".$msg_parent_guid.";".$msg_text.";".unxmlify($mesg->created_at).";".$msg_author.";".$msg_conversation_guid;
1327
1328                         $parent_author_signature = base64_decode($msg_parent_author_signature);
1329
1330                         $key = $msg["key"];
1331
1332                         if (!rsa_verify($owner_signed_data, $parent_author_signature, $key, "sha256")) {
1333                                 logger("owner verification failed.");
1334                                 return false;
1335                         }
1336                 }
1337
1338                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' LIMIT 1",
1339                         dbesc($message_uri)
1340                 );
1341                 if($r) {
1342                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1343                         return false;
1344                 }
1345
1346                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1347                         VALUES (%d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1348                         intval($importer["uid"]),
1349                         dbesc($msg_guid),
1350                         intval($conversation["id"]),
1351                         dbesc($person["name"]),
1352                         dbesc($person["photo"]),
1353                         dbesc($person["url"]),
1354                         intval($contact["id"]),
1355                         dbesc($subject),
1356                         dbesc($body),
1357                         0,
1358                         0,
1359                         dbesc($message_uri),
1360                         dbesc($author.":".$guid),
1361                         dbesc($msg_created_at)
1362                 );
1363
1364                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1365                         dbesc(datetime_convert()),
1366                         intval($conversation["id"])
1367                 );
1368
1369                 notification(array(
1370                         "type" => NOTIFY_MAIL,
1371                         "notify_flags" => $importer["notify-flags"],
1372                         "language" => $importer["language"],
1373                         "to_name" => $importer["username"],
1374                         "to_email" => $importer["email"],
1375                         "uid" =>$importer["uid"],
1376                         "item" => array("subject" => $subject, "body" => $body),
1377                         "source_name" => $person["name"],
1378                         "source_link" => $person["url"],
1379                         "source_photo" => $person["thumb"],
1380                         "verb" => ACTIVITY_POST,
1381                         "otype" => "mail"
1382                 ));
1383                 return true;
1384         }
1385
1386         /**
1387          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1388          *
1389          * @param array $importer Array of the importer user
1390          * @param array $msg Array of the processed message, author handle and key
1391          * @param object $data The message object
1392          *
1393          * @return bool Success
1394          */
1395         private function receive_conversation($importer, $msg, $data) {
1396                 $guid = notags(unxmlify($data->guid));
1397                 $subject = notags(unxmlify($data->subject));
1398                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1399                 $author = notags(unxmlify($data->author));
1400                 $participants = notags(unxmlify($data->participants));
1401
1402                 $messages = $data->message;
1403
1404                 if (!count($messages)) {
1405                         logger("empty conversation");
1406                         return false;
1407                 }
1408
1409                 $contact = self::allowed_contact_by_handle($importer, $msg["author"], true);
1410                 if (!$contact)
1411                         return false;
1412
1413                 $conversation = null;
1414
1415                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1416                         intval($importer["uid"]),
1417                         dbesc($guid)
1418                 );
1419                 if($c)
1420                         $conversation = $c[0];
1421                 else {
1422                         $r = q("INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1423                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1424                                 intval($importer["uid"]),
1425                                 dbesc($guid),
1426                                 dbesc($author),
1427                                 dbesc($created_at),
1428                                 dbesc(datetime_convert()),
1429                                 dbesc($subject),
1430                                 dbesc($participants)
1431                         );
1432                         if($r)
1433                                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1434                                         intval($importer["uid"]),
1435                                         dbesc($guid)
1436                                 );
1437
1438                         if($c)
1439                                 $conversation = $c[0];
1440                 }
1441                 if (!$conversation) {
1442                         logger("unable to create conversation.");
1443                         return;
1444                 }
1445
1446                 foreach($messages as $mesg)
1447                         self::receive_conversation_message($importer, $contact, $data, $msg, $mesg, $conversation);
1448
1449                 return true;
1450         }
1451
1452         /**
1453          * @brief Creates the body for a "like" message
1454          *
1455          * @param array $contact The contact that send us the "like"
1456          * @param array $parent_item The item array of the parent item
1457          * @param string $guid message guid
1458          *
1459          * @return string the body
1460          */
1461         private function construct_like_body($contact, $parent_item, $guid) {
1462                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
1463
1464                 $ulink = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1465                 $alink = "[url=".$parent_item["author-link"]."]".$parent_item["author-name"]."[/url]";
1466                 $plink = "[url=".App::get_baseurl()."/display/".urlencode($guid)."]".t("status")."[/url]";
1467
1468                 return sprintf($bodyverb, $ulink, $alink, $plink);
1469         }
1470
1471         /**
1472          * @brief Creates a XML object for a "like"
1473          *
1474          * @param array $importer Array of the importer user
1475          * @param array $parent_item The item array of the parent item
1476          *
1477          * @return string The XML
1478          */
1479         private function construct_like_object($importer, $parent_item) {
1480                 $objtype = ACTIVITY_OBJ_NOTE;
1481                 $link = '<link rel="alternate" type="text/html" href="'.App::get_baseurl()."/display/".$importer["nickname"]."/".$parent_item["id"].'" />';
1482                 $parent_body = $parent_item["body"];
1483
1484                 $xmldata = array("object" => array("type" => $objtype,
1485                                                 "local" => "1",
1486                                                 "id" => $parent_item["uri"],
1487                                                 "link" => $link,
1488                                                 "title" => "",
1489                                                 "content" => $parent_body));
1490
1491                 return xml::from_array($xmldata, $xml, true);
1492         }
1493
1494         /**
1495          * @brief Processes "like" messages
1496          *
1497          * @param array $importer Array of the importer user
1498          * @param string $sender The sender of the message
1499          * @param object $data The message object
1500          *
1501          * @return int The message id of the generated like or "false" if there was an error
1502          */
1503         private function receive_like($importer, $sender, $data) {
1504                 $positive = notags(unxmlify($data->positive));
1505                 $guid = notags(unxmlify($data->guid));
1506                 $parent_type = notags(unxmlify($data->parent_type));
1507                 $parent_guid = notags(unxmlify($data->parent_guid));
1508                 $author = notags(unxmlify($data->author));
1509
1510                 // likes on comments aren't supported by Diaspora - only on posts
1511                 // But maybe this will be supported in the future, so we will accept it.
1512                 if (!in_array($parent_type, array("Post", "Comment")))
1513                         return false;
1514
1515                 $contact = self::allowed_contact_by_handle($importer, $sender, true);
1516                 if (!$contact)
1517                         return false;
1518
1519                 $message_id = self::message_exists($importer["uid"], $guid);
1520                 if ($message_id)
1521                         return $message_id;
1522
1523                 $parent_item = self::parent_item($importer["uid"], $parent_guid, $author, $contact);
1524                 if (!$parent_item)
1525                         return false;
1526
1527                 $person = self::person_by_handle($author);
1528                 if (!is_array($person)) {
1529                         logger("unable to find author details");
1530                         return false;
1531                 }
1532
1533                 // Fetch the contact id - if we know this contact
1534                 $author_contact = self::author_contact_by_url($contact, $person, $importer["uid"]);
1535
1536                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1537                 // We would accept this anyhow.
1538                 if ($positive == "true")
1539                         $verb = ACTIVITY_LIKE;
1540                 else
1541                         $verb = ACTIVITY_DISLIKE;
1542
1543                 $datarray = array();
1544
1545                 $datarray["uid"] = $importer["uid"];
1546                 $datarray["contact-id"] = $author_contact["cid"];
1547                 $datarray["network"]  = $author_contact["network"];
1548
1549                 $datarray["author-name"] = $person["name"];
1550                 $datarray["author-link"] = $person["url"];
1551                 $datarray["author-avatar"] = ((x($person,"thumb")) ? $person["thumb"] : $person["photo"]);
1552
1553                 $datarray["owner-name"] = $contact["name"];
1554                 $datarray["owner-link"] = $contact["url"];
1555                 $datarray["owner-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
1556
1557                 $datarray["guid"] = $guid;
1558                 $datarray["uri"] = self::get_uri_from_guid($author, $guid);
1559
1560                 $datarray["type"] = "activity";
1561                 $datarray["verb"] = $verb;
1562                 $datarray["gravity"] = GRAVITY_LIKE;
1563                 $datarray["parent-uri"] = $parent_item["uri"];
1564
1565                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
1566                 $datarray["object"] = self::construct_like_object($importer, $parent_item);
1567
1568                 $datarray["body"] = self::construct_like_body($contact, $parent_item, $guid);
1569
1570                 $message_id = item_store($datarray);
1571
1572                 if ($message_id)
1573                         logger("Stored like ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
1574
1575                 // If we are the origin of the parent we store the original data and notify our followers
1576                 if($message_id AND $parent_item["origin"]) {
1577
1578                         // Formerly we stored the signed text, the signature and the author in different fields.
1579                         // We now store the raw data so that we are more flexible.
1580                         q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
1581                                 intval($message_id),
1582                                 dbesc(json_encode($data))
1583                         );
1584
1585                         // notify others
1586                         proc_run(PRIORITY_HIGH, "include/notifier.php", "comment-import", $message_id);
1587                 }
1588
1589                 return $message_id;
1590         }
1591
1592         /**
1593          * @brief Processes private messages
1594          *
1595          * @param array $importer Array of the importer user
1596          * @param object $data The message object
1597          *
1598          * @return bool Success?
1599          */
1600         private function receive_message($importer, $data) {
1601                 $guid = notags(unxmlify($data->guid));
1602                 $parent_guid = notags(unxmlify($data->parent_guid));
1603                 $text = unxmlify($data->text);
1604                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
1605                 $author = notags(unxmlify($data->author));
1606                 $conversation_guid = notags(unxmlify($data->conversation_guid));
1607
1608                 $contact = self::allowed_contact_by_handle($importer, $author, true);
1609                 if (!$contact)
1610                         return false;
1611
1612                 $conversation = null;
1613
1614                 $c = q("SELECT * FROM `conv` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1",
1615                         intval($importer["uid"]),
1616                         dbesc($conversation_guid)
1617                 );
1618                 if($c)
1619                         $conversation = $c[0];
1620                 else {
1621                         logger("conversation not available.");
1622                         return false;
1623                 }
1624
1625                 $reply = 0;
1626
1627                 $body = self::replace_people_guid(diaspora2bb($text), $person["url"]);
1628
1629                 $message_uri = $author.":".$guid;
1630
1631                 $person = self::person_by_handle($author);
1632                 if (!$person) {
1633                         logger("unable to find author details");
1634                         return false;
1635                 }
1636
1637                 $r = q("SELECT `id` FROM `mail` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
1638                         dbesc($message_uri),
1639                         intval($importer["uid"])
1640                 );
1641                 if($r) {
1642                         logger("duplicate message already delivered.", LOGGER_DEBUG);
1643                         return false;
1644                 }
1645
1646                 q("INSERT INTO `mail` (`uid`, `guid`, `convid`, `from-name`,`from-photo`,`from-url`,`contact-id`,`title`,`body`,`seen`,`reply`,`uri`,`parent-uri`,`created`)
1647                                 VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, '%s', '%s', %d, %d, '%s','%s','%s')",
1648                         intval($importer["uid"]),
1649                         dbesc($guid),
1650                         intval($conversation["id"]),
1651                         dbesc($person["name"]),
1652                         dbesc($person["photo"]),
1653                         dbesc($person["url"]),
1654                         intval($contact["id"]),
1655                         dbesc($conversation["subject"]),
1656                         dbesc($body),
1657                         0,
1658                         1,
1659                         dbesc($message_uri),
1660                         dbesc($author.":".$parent_guid),
1661                         dbesc($created_at)
1662                 );
1663
1664                 q("UPDATE `conv` SET `updated` = '%s' WHERE `id` = %d",
1665                         dbesc(datetime_convert()),
1666                         intval($conversation["id"])
1667                 );
1668
1669                 return true;
1670         }
1671
1672         /**
1673          * @brief Processes participations - unsupported by now
1674          *
1675          * @param array $importer Array of the importer user
1676          * @param object $data The message object
1677          *
1678          * @return bool always true
1679          */
1680         private function receive_participation($importer, $data) {
1681                 // I'm not sure if we can fully support this message type
1682                 return true;
1683         }
1684
1685         /**
1686          * @brief Processes photos - unneeded
1687          *
1688          * @param array $importer Array of the importer user
1689          * @param object $data The message object
1690          *
1691          * @return bool always true
1692          */
1693         private function receive_photo($importer, $data) {
1694                 // There doesn't seem to be a reason for this function, since the photo data is transmitted in the status message as well
1695                 return true;
1696         }
1697
1698         /**
1699          * @brief Processes poll participations - unssupported
1700          *
1701          * @param array $importer Array of the importer user
1702          * @param object $data The message object
1703          *
1704          * @return bool always true
1705          */
1706         private function receive_poll_participation($importer, $data) {
1707                 // We don't support polls by now
1708                 return true;
1709         }
1710
1711         /**
1712          * @brief Processes incoming profile updates
1713          *
1714          * @param array $importer Array of the importer user
1715          * @param object $data The message object
1716          *
1717          * @return bool Success
1718          */
1719         private function receive_profile($importer, $data) {
1720                 $author = strtolower(notags(unxmlify($data->author)));
1721
1722                 $contact = self::contact_by_handle($importer["uid"], $author);
1723                 if (!$contact)
1724                         return false;
1725
1726                 $name = unxmlify($data->first_name).((strlen($data->last_name)) ? " ".unxmlify($data->last_name) : "");
1727                 $image_url = unxmlify($data->image_url);
1728                 $birthday = unxmlify($data->birthday);
1729                 $location = diaspora2bb(unxmlify($data->location));
1730                 $about = diaspora2bb(unxmlify($data->bio));
1731                 $gender = unxmlify($data->gender);
1732                 $searchable = (unxmlify($data->searchable) == "true");
1733                 $nsfw = (unxmlify($data->nsfw) == "true");
1734                 $tags = unxmlify($data->tag_string);
1735
1736                 $tags = explode("#", $tags);
1737
1738                 $keywords = array();
1739                 foreach ($tags as $tag) {
1740                         $tag = trim(strtolower($tag));
1741                         if ($tag != "")
1742                                 $keywords[] = $tag;
1743                 }
1744
1745                 $keywords = implode(", ", $keywords);
1746
1747                 $handle_parts = explode("@", $author);
1748                 $nick = $handle_parts[0];
1749
1750                 if($name === "")
1751                         $name = $handle_parts[0];
1752
1753                 if( preg_match("|^https?://|", $image_url) === 0)
1754                         $image_url = "http://".$handle_parts[1].$image_url;
1755
1756                 update_contact_avatar($image_url, $importer["uid"], $contact["id"]);
1757
1758                 // Generic birthday. We don't know the timezone. The year is irrelevant.
1759
1760                 $birthday = str_replace("1000", "1901", $birthday);
1761
1762                 if ($birthday != "")
1763                         $birthday = datetime_convert("UTC", "UTC", $birthday, "Y-m-d");
1764
1765                 // this is to prevent multiple birthday notifications in a single year
1766                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
1767
1768                 if(substr($birthday,5) === substr($contact["bd"],5))
1769                         $birthday = $contact["bd"];
1770
1771                 $r = q("UPDATE `contact` SET `name` = '%s', `nick` = '%s', `addr` = '%s', `name-date` = '%s', `bd` = '%s',
1772                                 `location` = '%s', `about` = '%s', `keywords` = '%s', `gender` = '%s' WHERE `id` = %d AND `uid` = %d",
1773                         dbesc($name),
1774                         dbesc($nick),
1775                         dbesc($author),
1776                         dbesc(datetime_convert()),
1777                         dbesc($birthday),
1778                         dbesc($location),
1779                         dbesc($about),
1780                         dbesc($keywords),
1781                         dbesc($gender),
1782                         intval($contact["id"]),
1783                         intval($importer["uid"])
1784                 );
1785
1786                 if ($searchable) {
1787                         poco_check($contact["url"], $name, NETWORK_DIASPORA, $image_url, $about, $location, $gender, $keywords, "",
1788                                 datetime_convert(), 2, $contact["id"], $importer["uid"]);
1789                 }
1790
1791                 $gcontact = array("url" => $contact["url"], "network" => NETWORK_DIASPORA, "generation" => 2,
1792                                         "photo" => $image_url, "name" => $name, "location" => $location,
1793                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
1794                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
1795                                         "hide" => !$searchable, "nsfw" => $nsfw);
1796
1797                 update_gcontact($gcontact);
1798
1799                 logger("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], LOGGER_DEBUG);
1800
1801                 return true;
1802         }
1803
1804         /**
1805          * @brief Processes incoming friend requests
1806          *
1807          * @param array $importer Array of the importer user
1808          * @param array $contact The contact that send the request
1809          */
1810         private function receive_request_make_friend($importer, $contact) {
1811
1812                 $a = get_app();
1813
1814                 if($contact["rel"] == CONTACT_IS_FOLLOWER && in_array($importer["page-flags"], array(PAGE_FREELOVE))) {
1815                         q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
1816                                 intval(CONTACT_IS_FRIEND),
1817                                 intval($contact["id"]),
1818                                 intval($importer["uid"])
1819                         );
1820                 }
1821                 // send notification
1822
1823                 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
1824                         intval($importer["uid"])
1825                 );
1826
1827                 if($r && !$r[0]["hide-friends"] && !$contact["hidden"] && intval(get_pconfig($importer["uid"], "system", "post_newfriend"))) {
1828
1829                         $self = q("SELECT * FROM `contact` WHERE `self` AND `uid` = %d LIMIT 1",
1830                                 intval($importer["uid"])
1831                         );
1832
1833                         // they are not CONTACT_IS_FOLLOWER anymore but that's what we have in the array
1834
1835                         if($self && $contact["rel"] == CONTACT_IS_FOLLOWER) {
1836
1837                                 $arr = array();
1838                                 $arr["uri"] = $arr["parent-uri"] = item_new_uri($a->get_hostname(), $importer["uid"]);
1839                                 $arr["uid"] = $importer["uid"];
1840                                 $arr["contact-id"] = $self[0]["id"];
1841                                 $arr["wall"] = 1;
1842                                 $arr["type"] = 'wall';
1843                                 $arr["gravity"] = 0;
1844                                 $arr["origin"] = 1;
1845                                 $arr["author-name"] = $arr["owner-name"] = $self[0]["name"];
1846                                 $arr["author-link"] = $arr["owner-link"] = $self[0]["url"];
1847                                 $arr["author-avatar"] = $arr["owner-avatar"] = $self[0]["thumb"];
1848                                 $arr["verb"] = ACTIVITY_FRIEND;
1849                                 $arr["object-type"] = ACTIVITY_OBJ_PERSON;
1850
1851                                 $A = "[url=".$self[0]["url"]."]".$self[0]["name"]."[/url]";
1852                                 $B = "[url=".$contact["url"]."]".$contact["name"]."[/url]";
1853                                 $BPhoto = "[url=".$contact["url"]."][img]".$contact["thumb"]."[/img][/url]";
1854                                 $arr["body"] = sprintf(t("%1$s is now friends with %2$s"), $A, $B)."\n\n\n".$Bphoto;
1855
1856                                 $arr["object"] = self::construct_new_friend_object($contact);
1857
1858                                 $arr["last-child"] = 1;
1859
1860                                 $arr["allow_cid"] = $user[0]["allow_cid"];
1861                                 $arr["allow_gid"] = $user[0]["allow_gid"];
1862                                 $arr["deny_cid"]  = $user[0]["deny_cid"];
1863                                 $arr["deny_gid"]  = $user[0]["deny_gid"];
1864
1865                                 $i = item_store($arr);
1866                                 if($i)
1867                                         proc_run(PRIORITY_HIGH, "include/notifier.php", "activity", $i);
1868                         }
1869                 }
1870         }
1871
1872         /**
1873          * @brief Creates a XML object for a "new friend" message
1874          *
1875          * @param array $contact Array of the contact
1876          *
1877          * @return string The XML
1878          */
1879         private function construct_new_friend_object($contact) {
1880                 $objtype = ACTIVITY_OBJ_PERSON;
1881                 $link = '<link rel="alternate" type="text/html" href="'.$contact["url"].'" />'."\n".
1882                         '<link rel="photo" type="image/jpeg" href="'.$contact["thumb"].'" />'."\n";
1883
1884                 $xmldata = array("object" => array("type" => $objtype,
1885                                                 "title" => $contact["name"],
1886                                                 "id" => $contact["url"]."/".$contact["name"],
1887                                                 "link" => $link));
1888
1889                 return xml::from_array($xmldata, $xml, true);
1890         }
1891
1892         /**
1893          * @brief Processes incoming sharing notification
1894          *
1895          * @param array $importer Array of the importer user
1896          * @param object $data The message object
1897          *
1898          * @return bool Success
1899          */
1900         private function receive_contact_request($importer, $data) {
1901                 $author = unxmlify($data->author);
1902                 $recipient = unxmlify($data->recipient);
1903
1904                 if (!$author || !$recipient)
1905                         return false;
1906
1907                 // the current protocol version doesn't know these fields
1908                 // That means that we will assume their existance
1909                 if (isset($data->following))
1910                         $following = (unxmlify($data->following) == "true");
1911                 else
1912                         $following = true;
1913
1914                 if (isset($data->sharing))
1915                         $sharing = (unxmlify($data->sharing) == "true");
1916                 else
1917                         $sharing = true;
1918
1919                 $contact = self::contact_by_handle($importer["uid"],$author);
1920
1921                 // perhaps we were already sharing with this person. Now they're sharing with us.
1922                 // That makes us friends.
1923                 if ($contact) {
1924                         if ($following AND $sharing) {
1925                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to have a bidirectional conection.", LOGGER_DEBUG);
1926                                 self::receive_request_make_friend($importer, $contact);
1927
1928                                 // refetch the contact array
1929                                 $contact = self::contact_by_handle($importer["uid"],$author);
1930
1931                                 // If we are now friends, we are sending a share message.
1932                                 // Normally we needn't to do so, but the first message could have been vanished.
1933                                 if (in_array($contact["rel"], array(CONTACT_IS_FRIEND, CONTACT_IS_FOLLOWER))) {
1934                                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
1935                                         if($u) {
1936                                                 logger("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
1937                                                 $ret = self::send_share($u[0], $contact);
1938                                         }
1939                                 }
1940                                 return true;
1941                         } else { /// @todo Handle all possible variations of adding and retracting of permissions
1942                                 logger("Author ".$author." (Contact ".$contact["id"].") wants to change the relationship: Following: ".$following." - sharing: ".$sharing. "(By now unsupported)", LOGGER_DEBUG);
1943                                 return false;
1944                         }
1945                 }
1946
1947                 if (!$following AND $sharing AND in_array($importer["page-flags"], array(PAGE_SOAPBOX, PAGE_NORMAL))) {
1948                         logger("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", LOGGER_DEBUG);
1949                         return false;
1950                 } elseif (!$following AND !$sharing) {
1951                         logger("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", LOGGER_DEBUG);
1952                         return false;
1953                 } elseif (!$following AND $sharing) {
1954                         logger("Author ".$author." wants to share with us.", LOGGER_DEBUG);
1955                 } elseif ($following AND $sharing) {
1956                         logger("Author ".$author." wants to have a bidirectional conection.", LOGGER_DEBUG);
1957                 } elseif ($following AND !$sharing) {
1958                         logger("Author ".$author." wants to listen to us.", LOGGER_DEBUG);
1959                 }
1960
1961                 $ret = self::person_by_handle($author);
1962
1963                 if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
1964                         logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
1965                         return false;
1966                 }
1967
1968                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
1969
1970                 $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
1971                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
1972                         intval($importer["uid"]),
1973                         dbesc($ret["network"]),
1974                         dbesc($ret["addr"]),
1975                         datetime_convert(),
1976                         dbesc($ret["url"]),
1977                         dbesc(normalise_link($ret["url"])),
1978                         dbesc($batch),
1979                         dbesc($ret["name"]),
1980                         dbesc($ret["nick"]),
1981                         dbesc($ret["photo"]),
1982                         dbesc($ret["pubkey"]),
1983                         dbesc($ret["notify"]),
1984                         dbesc($ret["poll"]),
1985                         1,
1986                         2
1987                 );
1988
1989                 // find the contact record we just created
1990
1991                 $contact_record = self::contact_by_handle($importer["uid"],$author);
1992
1993                 if (!$contact_record) {
1994                         logger("unable to locate newly created contact record.");
1995                         return;
1996                 }
1997
1998                 logger("Author ".$author." was added as contact number ".$contact_record["id"].".", LOGGER_DEBUG);
1999
2000                 $def_gid = get_default_group($importer['uid'], $ret["network"]);
2001
2002                 if(intval($def_gid))
2003                         group_add_member($importer["uid"], "", $contact_record["id"], $def_gid);
2004
2005                 update_contact_avatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2006
2007                 if($importer["page-flags"] == PAGE_NORMAL) {
2008
2009                         logger("Sending intra message for author ".$author.".", LOGGER_DEBUG);
2010
2011                         $hash = random_string().(string)time();   // Generate a confirm_key
2012
2013                         $ret = q("INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2014                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2015                                 intval($importer["uid"]),
2016                                 intval($contact_record["id"]),
2017                                 0,
2018                                 0,
2019                                 dbesc(t("Sharing notification from Diaspora network")),
2020                                 dbesc($hash),
2021                                 dbesc(datetime_convert())
2022                         );
2023                 } else {
2024
2025                         // automatic friend approval
2026
2027                         logger("Does an automatic friend approval for author ".$author.".", LOGGER_DEBUG);
2028
2029                         update_contact_avatar($contact_record["photo"],$importer["uid"],$contact_record["id"]);
2030
2031                         // technically they are sharing with us (CONTACT_IS_SHARING),
2032                         // but if our page-type is PAGE_COMMUNITY or PAGE_SOAPBOX
2033                         // we are going to change the relationship and make them a follower.
2034
2035                         if (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing AND $following)
2036                                 $new_relation = CONTACT_IS_FRIEND;
2037                         elseif (($importer["page-flags"] == PAGE_FREELOVE) AND $sharing)
2038                                 $new_relation = CONTACT_IS_SHARING;
2039                         else
2040                                 $new_relation = CONTACT_IS_FOLLOWER;
2041
2042                         $r = q("UPDATE `contact` SET `rel` = %d,
2043                                 `name-date` = '%s',
2044                                 `uri-date` = '%s',
2045                                 `blocked` = 0,
2046                                 `pending` = 0,
2047                                 `writable` = 1
2048                                 WHERE `id` = %d
2049                                 ",
2050                                 intval($new_relation),
2051                                 dbesc(datetime_convert()),
2052                                 dbesc(datetime_convert()),
2053                                 intval($contact_record["id"])
2054                         );
2055
2056                         $u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1", intval($importer["uid"]));
2057                         if($u) {
2058                                 logger("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], LOGGER_DEBUG);
2059                                 $ret = self::send_share($u[0], $contact_record);
2060
2061                                 // Send the profile data, maybe it weren't transmitted before
2062                                 self::send_profile($importer["uid"], array($contact_record));
2063                         }
2064                 }
2065
2066                 return true;
2067         }
2068
2069         /**
2070          * @brief Fetches a message with a given guid
2071          *
2072          * @param string $guid message guid
2073          * @param string $orig_author handle of the original post
2074          * @param string $author handle of the sharer
2075          *
2076          * @return array The fetched item
2077          */
2078         private function original_item($guid, $orig_author, $author) {
2079
2080                 // Do we already have this item?
2081                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2082                                 `author-name`, `author-link`, `author-avatar`
2083                                 FROM `item` WHERE `guid` = '%s' AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2084                         dbesc($guid));
2085
2086                 if($r) {
2087                         logger("reshared message ".$guid." already exists on system.");
2088
2089                         // Maybe it is already a reshared item?
2090                         // Then refetch the content, if it is a reshare from a reshare.
2091                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2092                         if (self::is_reshare($r[0]["body"], true))
2093                                 $r = array();
2094                         elseif (self::is_reshare($r[0]["body"], false)) {
2095                                 $r[0]["body"] = self::replace_people_guid(diaspora2bb(bb2diaspora($r[0]["body"])), $r[0]["author-link"]);
2096
2097                                 // Add OEmbed and other information to the body
2098                                 $r[0]["body"] = add_page_info_to_body($r[0]["body"], false, true);
2099
2100                                 return $r[0];
2101                         } else
2102                                 return $r[0];
2103                 }
2104
2105                 if (!$r) {
2106                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2107                         logger("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2108                         $item_id = self::store_by_guid($guid, $server);
2109
2110                         if (!$item_id) {
2111                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2112                                 logger("2nd try: reshared message ".$guid." will be fetched without SLL from the server ".$server);
2113                                 $item_id = self::store_by_guid($guid, $server);
2114                         }
2115
2116                         if ($item_id) {
2117                                 $r = q("SELECT `body`, `tag`, `app`, `created`, `object-type`, `uri`, `guid`,
2118                                                 `author-name`, `author-link`, `author-avatar`
2119                                         FROM `item` WHERE `id` = %d AND `visible` AND NOT `deleted` AND `body` != '' LIMIT 1",
2120                                         intval($item_id));
2121
2122                                 if ($r) {
2123                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2124                                         if (self::is_reshare($r[0]["body"], false)) {
2125                                                 $r[0]["body"] = self::replace_people_guid(diaspora2bb(bb2diaspora($r[0]["body"])), $r[0]["author-link"]);
2126                                         }
2127
2128                                         return $r[0];
2129                                 }
2130
2131                         }
2132                 }
2133                 return false;
2134         }
2135
2136         /**
2137          * @brief Processes a reshare message
2138          *
2139          * @param array $importer Array of the importer user
2140          * @param object $data The message object
2141          * @param string $xml The original XML of the message
2142          *
2143          * @return int the message id
2144          */
2145         private function receive_reshare($importer, $data, $xml) {
2146                 $root_author = notags(unxmlify($data->root_author));
2147                 $root_guid = notags(unxmlify($data->root_guid));
2148                 $guid = notags(unxmlify($data->guid));
2149                 $author = notags(unxmlify($data->author));
2150                 $public = notags(unxmlify($data->public));
2151                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2152
2153                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2154                 if (!$contact)
2155                         return false;
2156
2157                 $message_id = self::message_exists($importer["uid"], $guid);
2158                 if ($message_id)
2159                         return $message_id;
2160
2161                 $original_item = self::original_item($root_guid, $root_author, $author);
2162                 if (!$original_item)
2163                         return false;
2164
2165                 $orig_url = App::get_baseurl()."/display/".$original_item["guid"];
2166
2167                 $datarray = array();
2168
2169                 $datarray["uid"] = $importer["uid"];
2170                 $datarray["contact-id"] = $contact["id"];
2171                 $datarray["network"]  = NETWORK_DIASPORA;
2172
2173                 $datarray["author-name"] = $contact["name"];
2174                 $datarray["author-link"] = $contact["url"];
2175                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2176
2177                 $datarray["owner-name"] = $datarray["author-name"];
2178                 $datarray["owner-link"] = $datarray["author-link"];
2179                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2180
2181                 $datarray["guid"] = $guid;
2182                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2183
2184                 $datarray["verb"] = ACTIVITY_POST;
2185                 $datarray["gravity"] = GRAVITY_PARENT;
2186
2187                 $datarray["object"] = $xml;
2188
2189                 $prefix = share_header($original_item["author-name"], $original_item["author-link"], $original_item["author-avatar"],
2190                                         $original_item["guid"], $original_item["created"], $orig_url);
2191                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2192
2193                 $datarray["tag"] = $original_item["tag"];
2194                 $datarray["app"]  = $original_item["app"];
2195
2196                 $datarray["plink"] = self::plink($author, $guid);
2197                 $datarray["private"] = (($public == "false") ? 1 : 0);
2198                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2199
2200                 $datarray["object-type"] = $original_item["object-type"];
2201
2202                 self::fetch_guid($datarray);
2203                 $message_id = item_store($datarray);
2204
2205                 if ($message_id)
2206                         logger("Stored reshare ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2207
2208                 return $message_id;
2209         }
2210
2211         /**
2212          * @brief Processes retractions
2213          *
2214          * @param array $importer Array of the importer user
2215          * @param array $contact The contact of the item owner
2216          * @param object $data The message object
2217          *
2218          * @return bool success
2219          */
2220         private function item_retraction($importer, $contact, $data) {
2221                 $target_type = notags(unxmlify($data->target_type));
2222                 $target_guid = notags(unxmlify($data->target_guid));
2223                 $author = notags(unxmlify($data->author));
2224
2225                 $person = self::person_by_handle($author);
2226                 if (!is_array($person)) {
2227                         logger("unable to find author detail for ".$author);
2228                         return false;
2229                 }
2230
2231                 $r = q("SELECT `id`, `parent`, `parent-uri`, `author-link` FROM `item` WHERE `guid` = '%s' AND `uid` = %d AND NOT `file` LIKE '%%[%%' LIMIT 1",
2232                         dbesc($target_guid),
2233                         intval($importer["uid"])
2234                 );
2235                 if (!$r)
2236                         return false;
2237
2238                 // Check if the sender is the thread owner
2239                 $p = q("SELECT `id`, `author-link`, `origin` FROM `item` WHERE `id` = %d",
2240                         intval($r[0]["parent"]));
2241
2242                 // Only delete it if the parent author really fits
2243                 if (!link_compare($p[0]["author-link"], $contact["url"]) AND !link_compare($r[0]["author-link"], $contact["url"])) {
2244                         logger("Thread author ".$p[0]["author-link"]." and item author ".$r[0]["author-link"]." don't fit to expected contact ".$contact["url"], LOGGER_DEBUG);
2245                         return false;
2246                 }
2247
2248                 // 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
2249                 q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = '' WHERE `id` = %d",
2250                         dbesc(datetime_convert()),
2251                         dbesc(datetime_convert()),
2252                         intval($r[0]["id"])
2253                 );
2254                 delete_thread($r[0]["id"], $r[0]["parent-uri"]);
2255
2256                 logger("Deleted target ".$target_guid." (".$r[0]["id"].") from user ".$importer["uid"]." parent: ".$p[0]["id"], LOGGER_DEBUG);
2257
2258                 // Now check if the retraction needs to be relayed by us
2259                 if($p[0]["origin"]) {
2260                         // notify others
2261                         proc_run(PRIORITY_HIGH, "include/notifier.php", "drop", $r[0]["id"]);
2262                 }
2263
2264                 return true;
2265         }
2266
2267         /**
2268          * @brief Receives retraction messages
2269          *
2270          * @param array $importer Array of the importer user
2271          * @param string $sender The sender of the message
2272          * @param object $data The message object
2273          *
2274          * @return bool Success
2275          */
2276         private function receive_retraction($importer, $sender, $data) {
2277                 $target_type = notags(unxmlify($data->target_type));
2278
2279                 $contact = self::contact_by_handle($importer["uid"], $sender);
2280                 if (!$contact) {
2281                         logger("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2282                         return false;
2283                 }
2284
2285                 logger("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], LOGGER_DEBUG);
2286
2287                 switch ($target_type) {
2288                         case "Comment":
2289                         case "Like":
2290                         case "Post": // "Post" will be supported in a future version
2291                         case "Reshare":
2292                         case "StatusMessage":
2293                                 return self::item_retraction($importer, $contact, $data);;
2294
2295                         case "Contact":
2296                         case "Person":
2297                                 /// @todo What should we do with an "unshare"?
2298                                 // Removing the contact isn't correct since we still can read the public items
2299                                 contact_remove($contact["id"]);
2300                                 return true;
2301
2302                         default:
2303                                 logger("Unknown target type ".$target_type);
2304                                 return false;
2305                 }
2306                 return true;
2307         }
2308
2309         /**
2310          * @brief Receives status messages
2311          *
2312          * @param array $importer Array of the importer user
2313          * @param object $data The message object
2314          * @param string $xml The original XML of the message
2315          *
2316          * @return int The message id of the newly created item
2317          */
2318         private function receive_status_message($importer, $data, $xml) {
2319                 $raw_message = unxmlify($data->raw_message);
2320                 $guid = notags(unxmlify($data->guid));
2321                 $author = notags(unxmlify($data->author));
2322                 $public = notags(unxmlify($data->public));
2323                 $created_at = datetime_convert("UTC", "UTC", notags(unxmlify($data->created_at)));
2324                 $provider_display_name = notags(unxmlify($data->provider_display_name));
2325
2326                 /// @todo enable support for polls
2327                 //if ($data->poll) {
2328                 //      foreach ($data->poll AS $poll)
2329                 //              print_r($poll);
2330                 //      die("poll!\n");
2331                 //}
2332                 $contact = self::allowed_contact_by_handle($importer, $author, false);
2333                 if (!$contact)
2334                         return false;
2335
2336                 $message_id = self::message_exists($importer["uid"], $guid);
2337                 if ($message_id)
2338                         return $message_id;
2339
2340                 $address = array();
2341                 if ($data->location)
2342                         foreach ($data->location->children() AS $fieldname => $data)
2343                                 $address[$fieldname] = notags(unxmlify($data));
2344
2345                 $body = diaspora2bb($raw_message);
2346
2347                 $datarray = array();
2348
2349                 // Attach embedded pictures to the body
2350                 if ($data->photo) {
2351                         foreach ($data->photo AS $photo)
2352                                 $body = "[img]".unxmlify($photo->remote_photo_path).
2353                                         unxmlify($photo->remote_photo_name)."[/img]\n".$body;
2354
2355                         $datarray["object-type"] = ACTIVITY_OBJ_PHOTO;
2356                 } else {
2357                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2358
2359                         // Add OEmbed and other information to the body
2360                         if (!self::is_redmatrix($contact["url"]))
2361                                 $body = add_page_info_to_body($body, false, true);
2362                 }
2363
2364                 $datarray["uid"] = $importer["uid"];
2365                 $datarray["contact-id"] = $contact["id"];
2366                 $datarray["network"] = NETWORK_DIASPORA;
2367
2368                 $datarray["author-name"] = $contact["name"];
2369                 $datarray["author-link"] = $contact["url"];
2370                 $datarray["author-avatar"] = ((x($contact,"thumb")) ? $contact["thumb"] : $contact["photo"]);
2371
2372                 $datarray["owner-name"] = $datarray["author-name"];
2373                 $datarray["owner-link"] = $datarray["author-link"];
2374                 $datarray["owner-avatar"] = $datarray["author-avatar"];
2375
2376                 $datarray["guid"] = $guid;
2377                 $datarray["uri"] = $datarray["parent-uri"] = self::get_uri_from_guid($author, $guid);
2378
2379                 $datarray["verb"] = ACTIVITY_POST;
2380                 $datarray["gravity"] = GRAVITY_PARENT;
2381
2382                 $datarray["object"] = $xml;
2383
2384                 $datarray["body"] = self::replace_people_guid($body, $datarray["author-link"]);
2385
2386                 if ($provider_display_name != "")
2387                         $datarray["app"] = $provider_display_name;
2388
2389                 $datarray["plink"] = self::plink($author, $guid);
2390                 $datarray["private"] = (($public == "false") ? 1 : 0);
2391                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2392
2393                 if (isset($address["address"]))
2394                         $datarray["location"] = $address["address"];
2395
2396                 if (isset($address["lat"]) AND isset($address["lng"]))
2397                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2398
2399                 self::fetch_guid($datarray);
2400                 $message_id = item_store($datarray);
2401
2402                 if ($message_id)
2403                         logger("Stored item ".$datarray["guid"]." with message id ".$message_id, LOGGER_DEBUG);
2404
2405                 return $message_id;
2406         }
2407
2408         /* ************************************************************************************** *
2409          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2410          * ************************************************************************************** */
2411
2412         /**
2413          * @brief returnes the handle of a contact
2414          *
2415          * @param array $me contact array
2416          *
2417          * @return string the handle in the format user@domain.tld
2418          */
2419         private function my_handle($contact) {
2420                 if ($contact["addr"] != "")
2421                         return $contact["addr"];
2422
2423                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2424                 // So - just in case - we build the the address here.
2425                 if ($contact["nickname"] != "")
2426                         $nick = $contact["nickname"];
2427                 else
2428                         $nick = $contact["nick"];
2429
2430                 return $nick."@".substr(App::get_baseurl(), strpos(App::get_baseurl(),"://") + 3);
2431         }
2432
2433         /**
2434          * @brief Creates the envelope for the "fetch" endpoint
2435          *
2436          * @param string $msg The message that is to be transmitted
2437          * @param array $user The record of the sender
2438          *
2439          * @return string The envelope
2440          */
2441
2442         public static function build_magic_envelope($msg, $user) {
2443
2444                 $b64url_data = base64url_encode($msg);
2445                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2446
2447                 $key_id = base64url_encode(diaspora::my_handle($user));
2448                 $type = "application/xml";
2449                 $encoding = "base64url";
2450                 $alg = "RSA-SHA256";
2451                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2452                 $signature = rsa_sign($signable_data, $user["prvkey"]);
2453                 $sig = base64url_encode($signature);
2454
2455                 $xmldata = array("me:env" => array("me:data" => $data,
2456                                                         "@attributes" => array("type" => $type),
2457                                                         "me:encoding" => $encoding,
2458                                                         "me:alg" => $alg,
2459                                                         "me:sig" => $sig,
2460                                                         "@attributes2" => array("key_id" => $key_id)));
2461
2462                 $namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
2463
2464                 return xml::from_array($xmldata, $xml, false, $namespaces);
2465         }
2466
2467         /**
2468          * @brief Creates the envelope for a public message
2469          *
2470          * @param string $msg The message that is to be transmitted
2471          * @param array $user The record of the sender
2472          * @param array $contact Target of the communication
2473          * @param string $prvkey The private key of the sender
2474          * @param string $pubkey The public key of the receiver
2475          *
2476          * @return string The envelope
2477          */
2478         private function build_public_message($msg, $user, $contact, $prvkey, $pubkey) {
2479
2480                 logger("Message: ".$msg, LOGGER_DATA);
2481
2482                 $handle = self::my_handle($user);
2483
2484                 $b64url_data = base64url_encode($msg);
2485
2486                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2487
2488                 $type = "application/xml";
2489                 $encoding = "base64url";
2490                 $alg = "RSA-SHA256";
2491
2492                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2493
2494                 $signature = rsa_sign($signable_data,$prvkey);
2495                 $sig = base64url_encode($signature);
2496
2497                 $xmldata = array("diaspora" => array("header" => array("author_id" => $handle),
2498                                                         "me:env" => array("me:encoding" => $encoding,
2499                                                         "me:alg" => $alg,
2500                                                         "me:data" => $data,
2501                                                         "@attributes" => array("type" => $type),
2502                                                         "me:sig" => $sig)));
2503
2504                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2505                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2506
2507                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2508
2509                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2510                 return $magic_env;
2511         }
2512
2513         /**
2514          * @brief Creates the envelope for a private message
2515          *
2516          * @param string $msg The message that is to be transmitted
2517          * @param array $user The record of the sender
2518          * @param array $contact Target of the communication
2519          * @param string $prvkey The private key of the sender
2520          * @param string $pubkey The public key of the receiver
2521          *
2522          * @return string The envelope
2523          */
2524         private function build_private_message($msg, $user, $contact, $prvkey, $pubkey) {
2525
2526                 logger("Message: ".$msg, LOGGER_DATA);
2527
2528                 // without a public key nothing will work
2529
2530                 if (!$pubkey) {
2531                         logger("pubkey missing: contact id: ".$contact["id"]);
2532                         return false;
2533                 }
2534
2535                 $inner_aes_key = random_string(32);
2536                 $b_inner_aes_key = base64_encode($inner_aes_key);
2537                 $inner_iv = random_string(16);
2538                 $b_inner_iv = base64_encode($inner_iv);
2539
2540                 $outer_aes_key = random_string(32);
2541                 $b_outer_aes_key = base64_encode($outer_aes_key);
2542                 $outer_iv = random_string(16);
2543                 $b_outer_iv = base64_encode($outer_iv);
2544
2545                 $handle = self::my_handle($user);
2546
2547                 $padded_data = pkcs5_pad($msg,16);
2548                 $inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);
2549
2550                 $b64_data = base64_encode($inner_encrypted);
2551
2552
2553                 $b64url_data = base64url_encode($b64_data);
2554                 $data = str_replace(array("\n", "\r", " ", "\t"), array("", "", "", ""), $b64url_data);
2555
2556                 $type = "application/xml";
2557                 $encoding = "base64url";
2558                 $alg = "RSA-SHA256";
2559
2560                 $signable_data = $data.".".base64url_encode($type).".".base64url_encode($encoding).".".base64url_encode($alg);
2561
2562                 $signature = rsa_sign($signable_data,$prvkey);
2563                 $sig = base64url_encode($signature);
2564
2565                 $xmldata = array("decrypted_header" => array("iv" => $b_inner_iv,
2566                                                         "aes_key" => $b_inner_aes_key,
2567                                                         "author_id" => $handle));
2568
2569                 $decrypted_header = xml::from_array($xmldata, $xml, true);
2570                 $decrypted_header = pkcs5_pad($decrypted_header,16);
2571
2572                 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
2573
2574                 $outer_json = json_encode(array("iv" => $b_outer_iv, "key" => $b_outer_aes_key));
2575
2576                 $encrypted_outer_key_bundle = "";
2577                 openssl_public_encrypt($outer_json, $encrypted_outer_key_bundle, $pubkey);
2578
2579                 $b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);
2580
2581                 logger("outer_bundle: ".$b64_encrypted_outer_key_bundle." key: ".$pubkey, LOGGER_DATA);
2582
2583                 $encrypted_header_json_object = json_encode(array("aes_key" => base64_encode($encrypted_outer_key_bundle),
2584                                                                 "ciphertext" => base64_encode($ciphertext)));
2585                 $cipher_json = base64_encode($encrypted_header_json_object);
2586
2587                 $xmldata = array("diaspora" => array("encrypted_header" => $cipher_json,
2588                                                 "me:env" => array("me:encoding" => $encoding,
2589                                                                 "me:alg" => $alg,
2590                                                                 "me:data" => $data,
2591                                                                 "@attributes" => array("type" => $type),
2592                                                                 "me:sig" => $sig)));
2593
2594                 $namespaces = array("" => "https://joindiaspora.com/protocol",
2595                                 "me" => "http://salmon-protocol.org/ns/magic-env");
2596
2597                 $magic_env = xml::from_array($xmldata, $xml, false, $namespaces);
2598
2599                 logger("magic_env: ".$magic_env, LOGGER_DATA);
2600                 return $magic_env;
2601         }
2602
2603         /**
2604          * @brief Create the envelope for a message
2605          *
2606          * @param string $msg The message that is to be transmitted
2607          * @param array $user The record of the sender
2608          * @param array $contact Target of the communication
2609          * @param string $prvkey The private key of the sender
2610          * @param string $pubkey The public key of the receiver
2611          * @param bool $public Is the message public?
2612          *
2613          * @return string The message that will be transmitted to other servers
2614          */
2615         private function build_message($msg, $user, $contact, $prvkey, $pubkey, $public = false) {
2616
2617                 if ($public)
2618                         $magic_env =  self::build_public_message($msg,$user,$contact,$prvkey,$pubkey);
2619                 else
2620                         $magic_env =  self::build_private_message($msg,$user,$contact,$prvkey,$pubkey);
2621
2622                 // The data that will be transmitted is double encoded via "urlencode", strange ...
2623                 $slap = "xml=".urlencode(urlencode($magic_env));
2624                 return $slap;
2625         }
2626
2627         /**
2628          * @brief Creates a signature for a message
2629          *
2630          * @param array $owner the array of the owner of the message
2631          * @param array $message The message that is to be signed
2632          *
2633          * @return string The signature
2634          */
2635         private function signature($owner, $message) {
2636                 $sigmsg = $message;
2637                 unset($sigmsg["author_signature"]);
2638                 unset($sigmsg["parent_author_signature"]);
2639
2640                 $signed_text = implode(";", $sigmsg);
2641
2642                 return base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
2643         }
2644
2645         /**
2646          * @brief Transmit a message to a target server
2647          *
2648          * @param array $owner the array of the item owner
2649          * @param array $contact Target of the communication
2650          * @param string $slap The message that is to be transmitted
2651          * @param bool $public_batch Is it a public post?
2652          * @param bool $queue_run Is the transmission called from the queue?
2653          * @param string $guid message guid
2654          *
2655          * @return int Result of the transmission
2656          */
2657         public static function transmit($owner, $contact, $slap, $public_batch, $queue_run=false, $guid = "") {
2658
2659                 $a = get_app();
2660
2661                 $enabled = intval(get_config("system", "diaspora_enabled"));
2662                 if(!$enabled)
2663                         return 200;
2664
2665                 $logid = random_string(4);
2666                 $dest_url = (($public_batch) ? $contact["batch"] : $contact["notify"]);
2667                 if (!$dest_url) {
2668                         logger("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
2669                         return 0;
2670                 }
2671
2672                 logger("transmit: ".$logid."-".$guid." ".$dest_url);
2673
2674                 if (!$queue_run && was_recently_delayed($contact["id"])) {
2675                         $return_code = 0;
2676                 } else {
2677                         if (!intval(get_config("system", "diaspora_test"))) {
2678                                 post_url($dest_url."/", $slap);
2679                                 $return_code = $a->get_curl_code();
2680                         } else {
2681                                 logger("test_mode");
2682                                 return 200;
2683                         }
2684                 }
2685
2686                 logger("transmit: ".$logid."-".$guid." returns: ".$return_code);
2687
2688                 if(!$return_code || (($return_code == 503) && (stristr($a->get_curl_headers(), "retry-after")))) {
2689                         logger("queue message");
2690
2691                         $r = q("SELECT `id` FROM `queue` WHERE `cid` = %d AND `network` = '%s' AND `content` = '%s' AND `batch` = %d LIMIT 1",
2692                                 intval($contact["id"]),
2693                                 dbesc(NETWORK_DIASPORA),
2694                                 dbesc($slap),
2695                                 intval($public_batch)
2696                         );
2697                         if($r) {
2698                                 logger("add_to_queue ignored - identical item already in queue");
2699                         } else {
2700                                 // queue message for redelivery
2701                                 add_to_queue($contact["id"], NETWORK_DIASPORA, $slap, $public_batch);
2702
2703                                 // The message could not be delivered. We mark the contact as "dead"
2704                                 mark_for_death($contact);
2705                         }
2706                 } elseif (($return_code >= 200) AND ($return_code <= 299)) {
2707                         // We successfully delivered a message, the contact is alive
2708                         unmark_for_death($contact);
2709                 }
2710
2711                 return(($return_code) ? $return_code : (-1));
2712         }
2713
2714
2715         /**
2716          * @brief Build the post xml
2717          *
2718          * @param string $type The message type
2719          * @param array $message The message data
2720          *
2721          * @return string The post XML
2722          */
2723         public static function build_post_xml($type, $message) {
2724
2725                 $data = array("XML" => array("post" => array($type => $message)));
2726                 return xml::from_array($data, $xml);
2727         }
2728
2729         /**
2730          * @brief Builds and transmit messages
2731          *
2732          * @param array $owner the array of the item owner
2733          * @param array $contact Target of the communication
2734          * @param string $type The message type
2735          * @param array $message The message data
2736          * @param bool $public_batch Is it a public post?
2737          * @param string $guid message guid
2738          * @param bool $spool Should the transmission be spooled or transmitted?
2739          *
2740          * @return int Result of the transmission
2741          */
2742         private function build_and_transmit($owner, $contact, $type, $message, $public_batch = false, $guid = "", $spool = false) {
2743
2744                 $msg = self::build_post_xml($type, $message);
2745
2746                 logger('message: '.$msg, LOGGER_DATA);
2747                 logger('send guid '.$guid, LOGGER_DEBUG);
2748
2749                 // Fallback if the private key wasn't transmitted in the expected field
2750                 if ($owner['uprvkey'] == "")
2751                         $owner['uprvkey'] = $owner['prvkey'];
2752
2753                 $slap = self::build_message($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
2754
2755                 if ($spool) {
2756                         add_to_queue($contact['id'], NETWORK_DIASPORA, $slap, $public_batch);
2757                         return true;
2758                 } else
2759                         $return_code = self::transmit($owner, $contact, $slap, $public_batch, false, $guid);
2760
2761                 logger("guid: ".$item["guid"]." result ".$return_code, LOGGER_DEBUG);
2762
2763                 return $return_code;
2764         }
2765
2766         /**
2767          * @brief Sends a "share" message
2768          *
2769          * @param array $owner the array of the item owner
2770          * @param array $contact Target of the communication
2771          *
2772          * @return int The result of the transmission
2773          */
2774         public static function send_share($owner,$contact) {
2775
2776                 $message = array("sender_handle" => self::my_handle($owner),
2777                                 "recipient_handle" => $contact["addr"]);
2778
2779                 logger("Send share ".print_r($message, true), LOGGER_DEBUG);
2780
2781                 return self::build_and_transmit($owner, $contact, "request", $message);
2782         }
2783
2784         /**
2785          * @brief sends an "unshare"
2786          *
2787          * @param array $owner the array of the item owner
2788          * @param array $contact Target of the communication
2789          *
2790          * @return int The result of the transmission
2791          */
2792         public static function send_unshare($owner,$contact) {
2793
2794                 $message = array("post_guid" => $owner["guid"],
2795                                 "diaspora_handle" => self::my_handle($owner),
2796                                 "type" => "Person");
2797
2798                 logger("Send unshare ".print_r($message, true), LOGGER_DEBUG);
2799
2800                 return self::build_and_transmit($owner, $contact, "retraction", $message);
2801         }
2802
2803         /**
2804          * @brief Checks a message body if it is a reshare
2805          *
2806          * @param string $body The message body that is to be check
2807          * @param bool $complete Should it be a complete check or a simple check?
2808          *
2809          * @return array|bool Reshare details or "false" if no reshare
2810          */
2811         public static function is_reshare($body, $complete = true) {
2812                 $body = trim($body);
2813
2814                 // Skip if it isn't a pure repeated messages
2815                 // Does it start with a share?
2816                 if ((strpos($body, "[share") > 0) AND $complete)
2817                         return(false);
2818
2819                 // Does it end with a share?
2820                 if (strlen($body) > (strrpos($body, "[/share]") + 8))
2821                         return(false);
2822
2823                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism","$1",$body);
2824                 // Skip if there is no shared message in there
2825                 if ($body == $attributes)
2826                         return(false);
2827
2828                 // If we don't do the complete check we quit here
2829                 if (!$complete)
2830                         return true;
2831
2832                 $guid = "";
2833                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
2834                 if ($matches[1] != "")
2835                         $guid = $matches[1];
2836
2837                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
2838                 if ($matches[1] != "")
2839                         $guid = $matches[1];
2840
2841                 if ($guid != "") {
2842                         $r = q("SELECT `contact-id` FROM `item` WHERE `guid` = '%s' AND `network` IN ('%s', '%s') LIMIT 1",
2843                                 dbesc($guid), NETWORK_DFRN, NETWORK_DIASPORA);
2844                         if ($r) {
2845                                 $ret= array();
2846                                 $ret["root_handle"] = self::handle_from_contact($r[0]["contact-id"]);
2847                                 $ret["root_guid"] = $guid;
2848                                 return($ret);
2849                         }
2850                 }
2851
2852                 $profile = "";
2853                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
2854                 if ($matches[1] != "")
2855                         $profile = $matches[1];
2856
2857                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
2858                 if ($matches[1] != "")
2859                         $profile = $matches[1];
2860
2861                 $ret= array();
2862
2863                 $ret["root_handle"] = preg_replace("=https?://(.*)/u/(.*)=ism", "$2@$1", $profile);
2864                 if (($ret["root_handle"] == $profile) OR ($ret["root_handle"] == ""))
2865                         return(false);
2866
2867                 $link = "";
2868                 preg_match("/link='(.*?)'/ism", $attributes, $matches);
2869                 if ($matches[1] != "")
2870                         $link = $matches[1];
2871
2872                 preg_match('/link="(.*?)"/ism', $attributes, $matches);
2873                 if ($matches[1] != "")
2874                         $link = $matches[1];
2875
2876                 $ret["root_guid"] = preg_replace("=https?://(.*)/posts/(.*)=ism", "$2", $link);
2877                 if (($ret["root_guid"] == $link) OR (trim($ret["root_guid"]) == ""))
2878                         return(false);
2879
2880                 return($ret);
2881         }
2882
2883         /**
2884          * @brief Create a post (status message or reshare)
2885          *
2886          * @param array $item The item that will be exported
2887          * @param array $owner the array of the item owner
2888          *
2889          * @return array
2890          * 'type' -> Message type ("status_message" or "reshare")
2891          * 'message' -> Array of XML elements of the status
2892          */
2893         public static function build_status($item, $owner) {
2894
2895                 $myaddr = self::my_handle($owner);
2896
2897                 $public = (($item["private"]) ? "false" : "true");
2898
2899                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
2900
2901                 // Detect a share element and do a reshare
2902                 if (!$item['private'] AND ($ret = self::is_reshare($item["body"]))) {
2903                         $message = array("root_diaspora_id" => $ret["root_handle"],
2904                                         "root_guid" => $ret["root_guid"],
2905                                         "guid" => $item["guid"],
2906                                         "diaspora_handle" => $myaddr,
2907                                         "public" => $public,
2908                                         "created_at" => $created,
2909                                         "provider_display_name" => $item["app"]);
2910
2911                         $type = "reshare";
2912                 } else {
2913                         $title = $item["title"];
2914                         $body = $item["body"];
2915
2916                         // convert to markdown
2917                         $body = html_entity_decode(bb2diaspora($body));
2918
2919                         // Adding the title
2920                         if(strlen($title))
2921                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
2922
2923                         if ($item["attach"]) {
2924                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
2925                                 if(cnt) {
2926                                         $body .= "\n".t("Attachments:")."\n";
2927                                         foreach($matches as $mtch)
2928                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
2929                                 }
2930                         }
2931
2932                         $location = array();
2933
2934                         if ($item["location"] != "")
2935                                 $location["address"] = $item["location"];
2936
2937                         if ($item["coord"] != "") {
2938                                 $coord = explode(" ", $item["coord"]);
2939                                 $location["lat"] = $coord[0];
2940                                 $location["lng"] = $coord[1];
2941                         }
2942
2943                         $message = array("raw_message" => $body,
2944                                         "location" => $location,
2945                                         "guid" => $item["guid"],
2946                                         "diaspora_handle" => $myaddr,
2947                                         "public" => $public,
2948                                         "created_at" => $created,
2949                                         "provider_display_name" => $item["app"]);
2950
2951                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
2952                         if (!isset($location["lat"]) OR !isset($location["lng"])) {
2953                                 unset($message["location"]);
2954                         }
2955
2956                         $type = "status_message";
2957                 }
2958                 return array("type" => $type, "message" => $message);
2959         }
2960
2961         /**
2962          * @brief Sends a post
2963          *
2964          * @param array $item The item that will be exported
2965          * @param array $owner the array of the item owner
2966          * @param array $contact Target of the communication
2967          * @param bool $public_batch Is it a public post?
2968          *
2969          * @return int The result of the transmission
2970          */
2971         public static function send_status($item, $owner, $contact, $public_batch = false) {
2972
2973                 $status = diaspora::build_status($item, $owner);
2974
2975                 return self::build_and_transmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
2976         }
2977
2978         /**
2979          * @brief Creates a "like" object
2980          *
2981          * @param array $item The item that will be exported
2982          * @param array $owner the array of the item owner
2983          *
2984          * @return array The data for a "like"
2985          */
2986         private function construct_like($item, $owner) {
2987
2988                 $p = q("SELECT `guid`, `uri`, `parent-uri` FROM `item` WHERE `uri` = '%s' LIMIT 1",
2989                         dbesc($item["thr-parent"]));
2990                 if(!$p)
2991                         return false;
2992
2993                 $parent = $p[0];
2994
2995                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
2996                 $positive = "true";
2997
2998                 return(array("positive" => $positive,
2999                                 "guid" => $item["guid"],
3000                                 "target_type" => $target_type,
3001                                 "parent_guid" => $parent["guid"],
3002                                 "author_signature" => "",
3003                                 "diaspora_handle" => self::my_handle($owner)));
3004         }
3005
3006         /**
3007          * @brief Creates the object for a comment
3008          *
3009          * @param array $item The item that will be exported
3010          * @param array $owner the array of the item owner
3011          *
3012          * @return array The data for a comment
3013          */
3014         private function construct_comment($item, $owner) {
3015
3016                 $p = q("SELECT `guid` FROM `item` WHERE `parent` = %d AND `id` = %d LIMIT 1",
3017                         intval($item["parent"]),
3018                         intval($item["parent"])
3019                 );
3020
3021                 if (!$p)
3022                         return false;
3023
3024                 $parent = $p[0];
3025
3026                 $text = html_entity_decode(bb2diaspora($item["body"]));
3027
3028                 return(array("guid" => $item["guid"],
3029                                 "parent_guid" => $parent["guid"],
3030                                 "author_signature" => "",
3031                                 "text" => $text,
3032                                 "diaspora_handle" => self::my_handle($owner)));
3033         }
3034
3035         /**
3036          * @brief Send a like or a comment
3037          *
3038          * @param array $item The item that will be exported
3039          * @param array $owner the array of the item owner
3040          * @param array $contact Target of the communication
3041          * @param bool $public_batch Is it a public post?
3042          *
3043          * @return int The result of the transmission
3044          */
3045         public static function send_followup($item,$owner,$contact,$public_batch = false) {
3046
3047                 if($item['verb'] === ACTIVITY_LIKE) {
3048                         $message = self::construct_like($item, $owner);
3049                         $type = "like";
3050                 } else {
3051                         $message = self::construct_comment($item, $owner);
3052                         $type = "comment";
3053                 }
3054
3055                 if (!$message)
3056                         return false;
3057
3058                 $message["author_signature"] = self::signature($owner, $message);
3059
3060                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3061         }
3062
3063         /**
3064          * @brief Creates a message from a signature record entry
3065          *
3066          * @param array $item The item that will be exported
3067          * @param array $signature The entry of the "sign" record
3068          *
3069          * @return string The message
3070          */
3071         private function message_from_signature($item, $signature) {
3072
3073                 // Split the signed text
3074                 $signed_parts = explode(";", $signature['signed_text']);
3075
3076                 if ($item["deleted"])
3077                         $message = array("parent_author_signature" => "",
3078                                         "target_guid" => $signed_parts[0],
3079                                         "target_type" => $signed_parts[1],
3080                                         "sender_handle" => $signature['signer'],
3081                                         "target_author_signature" => $signature['signature']);
3082                 elseif ($item['verb'] === ACTIVITY_LIKE)
3083                         $message = array("positive" => $signed_parts[0],
3084                                         "guid" => $signed_parts[1],
3085                                         "target_type" => $signed_parts[2],
3086                                         "parent_guid" => $signed_parts[3],
3087                                         "parent_author_signature" => "",
3088                                         "author_signature" => $signature['signature'],
3089                                         "diaspora_handle" => $signed_parts[4]);
3090                 else {
3091                         // Remove the comment guid
3092                         $guid = array_shift($signed_parts);
3093
3094                         // Remove the parent guid
3095                         $parent_guid = array_shift($signed_parts);
3096
3097                         // Remove the handle
3098                         $handle = array_pop($signed_parts);
3099
3100                         // Glue the parts together
3101                         $text = implode(";", $signed_parts);
3102
3103                         $message = array("guid" => $guid,
3104                                         "parent_guid" => $parent_guid,
3105                                         "parent_author_signature" => "",
3106                                         "author_signature" => $signature['signature'],
3107                                         "text" => implode(";", $signed_parts),
3108                                         "diaspora_handle" => $handle);
3109                 }
3110                 return $message;
3111         }
3112
3113         /**
3114          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3115          *
3116          * @param array $item The item that will be exported
3117          * @param array $owner the array of the item owner
3118          * @param array $contact Target of the communication
3119          * @param bool $public_batch Is it a public post?
3120          *
3121          * @return int The result of the transmission
3122          */
3123         public static function send_relay($item, $owner, $contact, $public_batch = false) {
3124
3125                 if ($item["deleted"])
3126                         return self::send_retraction($item, $owner, $contact, $public_batch, true);
3127                 elseif ($item['verb'] === ACTIVITY_LIKE)
3128                         $type = "like";
3129                 else
3130                         $type = "comment";
3131
3132                 logger("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3133
3134                 // fetch the original signature
3135
3136                 $r = q("SELECT `signed_text`, `signature`, `signer` FROM `sign` WHERE `iid` = %d LIMIT 1",
3137                         intval($item["id"]));
3138
3139                 if (!$r) {
3140                         logger("Couldn't fetch signatur for item ".$item["guid"]." (".$item["id"].")", LOGGER_DEBUG);
3141                         return false;
3142                 }
3143
3144                 $signature = $r[0];
3145
3146                 // Old way - is used by the internal Friendica functions
3147                 /// @todo Change all signatur storing functions to the new format
3148                 if ($signature['signed_text'] AND $signature['signature'] AND $signature['signer'])
3149                         $message = self::message_from_signature($item, $signature);
3150                 else {// New way
3151                         $msg = json_decode($signature['signed_text'], true);
3152
3153                         $message = array();
3154                         if (is_array($msg)) {
3155                                 foreach ($msg AS $field => $data) {
3156                                         if (!$item["deleted"]) {
3157                                                 if ($field == "author")
3158                                                         $field = "diaspora_handle";
3159                                                 if ($field == "parent_type")
3160                                                         $field = "target_type";
3161                                         }
3162
3163                                         $message[$field] = $data;
3164                                 }
3165                         } else
3166                                 logger("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$signature['signed_text'], LOGGER_DEBUG);
3167                 }
3168
3169                 $message["parent_author_signature"] = self::signature($owner, $message);
3170
3171                 logger("Relayed data ".print_r($message, true), LOGGER_DEBUG);
3172
3173                 return self::build_and_transmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3174         }
3175
3176         /**
3177          * @brief Sends a retraction (deletion) of a message, like or comment
3178          *
3179          * @param array $item The item that will be exported
3180          * @param array $owner the array of the item owner
3181          * @param array $contact Target of the communication
3182          * @param bool $public_batch Is it a public post?
3183          * @param bool $relay Is the retraction transmitted from a relay?
3184          *
3185          * @return int The result of the transmission
3186          */
3187         public static function send_retraction($item, $owner, $contact, $public_batch = false, $relay = false) {
3188
3189                 $itemaddr = self::handle_from_contact($item["contact-id"], $item["gcontact-id"]);
3190
3191                 // Check whether the retraction is for a top-level post or whether it's a relayable
3192                 if ($item["uri"] !== $item["parent-uri"]) {
3193                         $msg_type = "relayable_retraction";
3194                         $target_type = (($item["verb"] === ACTIVITY_LIKE) ? "Like" : "Comment");
3195                 } else {
3196                         $msg_type = "signed_retraction";
3197                         $target_type = "StatusMessage";
3198                 }
3199
3200                 if ($relay AND ($item["uri"] !== $item["parent-uri"]))
3201                         $signature = "parent_author_signature";
3202                 else
3203                         $signature = "target_author_signature";
3204
3205                 $signed_text = $item["guid"].";".$target_type;
3206
3207                 $message = array("target_guid" => $item['guid'],
3208                                 "target_type" => $target_type,
3209                                 "sender_handle" => $itemaddr,
3210                                 $signature => base64_encode(rsa_sign($signed_text,$owner['uprvkey'],'sha256')));
3211
3212                 logger("Got message ".print_r($message, true), LOGGER_DEBUG);
3213
3214                 return self::build_and_transmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3215         }
3216
3217         /**
3218          * @brief Sends a mail
3219          *
3220          * @param array $item The item that will be exported
3221          * @param array $owner The owner
3222          * @param array $contact Target of the communication
3223          *
3224          * @return int The result of the transmission
3225          */
3226         public static function send_mail($item, $owner, $contact) {
3227
3228                 $myaddr = self::my_handle($owner);
3229
3230                 $r = q("SELECT * FROM `conv` WHERE `id` = %d AND `uid` = %d LIMIT 1",
3231                         intval($item["convid"]),
3232                         intval($item["uid"])
3233                 );
3234
3235                 if (!$r) {
3236                         logger("conversation not found.");
3237                         return;
3238                 }
3239                 $cnv = $r[0];
3240
3241                 $conv = array(
3242                         "guid" => $cnv["guid"],
3243                         "subject" => $cnv["subject"],
3244                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
3245                         "diaspora_handle" => $cnv["creator"],
3246                         "participant_handles" => $cnv["recips"]
3247                 );
3248
3249                 $body = bb2diaspora($item["body"]);
3250                 $created = datetime_convert("UTC", "UTC", $item["created"], 'Y-m-d H:i:s \U\T\C');
3251
3252                 $signed_text = $item["guid"].";".$cnv["guid"].";".$body.";".$created.";".$myaddr.";".$cnv['guid'];
3253                 $sig = base64_encode(rsa_sign($signed_text, $owner["uprvkey"], "sha256"));
3254
3255                 $msg = array(
3256                         "guid" => $item["guid"],
3257                         "parent_guid" => $cnv["guid"],
3258                         "parent_author_signature" => $sig,
3259                         "author_signature" => $sig,
3260                         "text" => $body,
3261                         "created_at" => $created,
3262                         "diaspora_handle" => $myaddr,
3263                         "conversation_guid" => $cnv["guid"]
3264                 );
3265
3266                 if ($item["reply"]) {
3267                         $message = $msg;
3268                         $type = "message";
3269                 } else {
3270                         $message = array("guid" => $cnv["guid"],
3271                                         "subject" => $cnv["subject"],
3272                                         "created_at" => datetime_convert("UTC", "UTC", $cnv['created'], 'Y-m-d H:i:s \U\T\C'),
3273                                         "message" => $msg,
3274                                         "diaspora_handle" => $cnv["creator"],
3275                                         "participant_handles" => $cnv["recips"]);
3276
3277                         $type = "conversation";
3278                 }
3279
3280                 return self::build_and_transmit($owner, $contact, $type, $message, false, $item["guid"]);
3281         }
3282
3283         /**
3284          * @brief Sends profile data
3285          *
3286          * @param int $uid The user id
3287          */
3288         public static function send_profile($uid, $recips = false) {
3289
3290                 if (!$uid)
3291                         return;
3292
3293                 if (!$recips)
3294                         $recips = q("SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
3295                                 AND `uid` = %d AND `rel` != %d",
3296                                 dbesc(NETWORK_DIASPORA),
3297                                 intval($uid),
3298                                 intval(CONTACT_IS_SHARING)
3299                         );
3300                 if (!$recips)
3301                         return;
3302
3303                 $r = q("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
3304                         FROM `profile`
3305                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
3306                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
3307                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
3308                         intval($uid)
3309                 );
3310
3311                 if (!$r)
3312                         return;
3313
3314                 $profile = $r[0];
3315
3316                 $handle = $profile["addr"];
3317                 $first = ((strpos($profile['name'],' ')
3318                         ? trim(substr($profile['name'],0,strpos($profile['name'],' '))) : $profile['name']));
3319                 $last = (($first === $profile['name']) ? '' : trim(substr($profile['name'], strlen($first))));
3320                 $large = App::get_baseurl().'/photo/custom/300/'.$profile['uid'].'.jpg';
3321                 $medium = App::get_baseurl().'/photo/custom/100/'.$profile['uid'].'.jpg';
3322                 $small = App::get_baseurl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
3323                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
3324
3325                 if ($searchable === 'true') {
3326                         $dob = '1000-00-00';
3327
3328                         if (($profile['dob']) && ($profile['dob'] != '0000-00-00'))
3329                                 $dob = ((intval($profile['dob'])) ? intval($profile['dob']) : '1000') .'-'. datetime_convert('UTC','UTC',$profile['dob'],'m-d');
3330
3331                         $about = $profile['about'];
3332                         $about = strip_tags(bbcode($about));
3333
3334                         $location = formatted_location($profile);
3335                         $tags = '';
3336                         if ($profile['pub_keywords']) {
3337                                 $kw = str_replace(',',' ',$profile['pub_keywords']);
3338                                 $kw = str_replace('  ',' ',$kw);
3339                                 $arr = explode(' ',$profile['pub_keywords']);
3340                                 if (count($arr)) {
3341                                         for($x = 0; $x < 5; $x ++) {
3342                                                 if (trim($arr[$x]))
3343                                                         $tags .= '#'. trim($arr[$x]) .' ';
3344                                         }
3345                                 }
3346                         }
3347                         $tags = trim($tags);
3348                 }
3349
3350                 $message = array("diaspora_handle" => $handle,
3351                                 "first_name" => $first,
3352                                 "last_name" => $last,
3353                                 "image_url" => $large,
3354                                 "image_url_medium" => $medium,
3355                                 "image_url_small" => $small,
3356                                 "birthday" => $dob,
3357                                 "gender" => $profile['gender'],
3358                                 "bio" => $about,
3359                                 "location" => $location,
3360                                 "searchable" => $searchable,
3361                                 "tag_string" => $tags);
3362
3363                 foreach($recips as $recip) {
3364                         logger("Send updated profile data for user ".$uid." to contact ".$recip["id"], LOGGER_DEBUG);
3365                         self::build_and_transmit($profile, $recip, "profile", $message, false, "", true);
3366                 }
3367         }
3368
3369         /**
3370          * @brief Stores the signature for likes that are created on our system
3371          *
3372          * @param array $contact The contact array of the "like"
3373          * @param int $post_id The post id of the "like"
3374          *
3375          * @return bool Success
3376          */
3377         public static function store_like_signature($contact, $post_id) {
3378
3379                 // Is the contact the owner? Then fetch the private key
3380                 if (!$contact['self'] OR ($contact['uid'] == 0)) {
3381                         logger("No owner post, so not storing signature", LOGGER_DEBUG);
3382                         return false;
3383                 }
3384
3385                 $r = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($contact['uid']));
3386                 if(!$r)
3387                         return false;
3388
3389                 $contact["uprvkey"] = $r[0]['prvkey'];
3390
3391                 $r = q("SELECT * FROM `item` WHERE `id` = %d LIMIT 1", intval($post_id));
3392                 if (!$r)
3393                         return false;
3394
3395                 if (!in_array($r[0]["verb"], array(ACTIVITY_LIKE, ACTIVITY_DISLIKE)))
3396                         return false;
3397
3398                 $message = self::construct_like($r[0], $contact);
3399                 $message["author_signature"] = self::signature($contact, $message);
3400
3401                 // In the future we will store the signature more flexible to support new fields.
3402                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3403                 // (We are transmitting this data here via DFRN)
3404
3405                 $signed_text = $message["positive"].";".$message["guid"].";".$message["target_type"].";".
3406                                 $message["parent_guid"].";".$message["diaspora_handle"];
3407
3408                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3409                         intval($post_id),
3410                         dbesc($signed_text),
3411                         dbesc($message["author_signature"]),
3412                         dbesc($message["diaspora_handle"])
3413                 );
3414
3415                 // This here will replace the lines above, once Diaspora changed its protocol
3416                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3417                 //      intval($message_id),
3418                 //      dbesc(json_encode($message))
3419                 //);
3420
3421                 logger('Stored diaspora like signature');
3422                 return true;
3423         }
3424
3425         /**
3426          * @brief Stores the signature for comments that are created on our system
3427          *
3428          * @param array $item The item array of the comment
3429          * @param array $contact The contact array of the item owner
3430          * @param string $uprvkey The private key of the sender
3431          * @param int $message_id The message id of the comment
3432          *
3433          * @return bool Success
3434          */
3435         public static function store_comment_signature($item, $contact, $uprvkey, $message_id) {
3436
3437                 if ($uprvkey == "") {
3438                         logger('No private key, so not storing comment signature', LOGGER_DEBUG);
3439                         return false;
3440                 }
3441
3442                 $contact["uprvkey"] = $uprvkey;
3443
3444                 $message = self::construct_comment($item, $contact);
3445                 $message["author_signature"] = self::signature($contact, $message);
3446
3447                 // In the future we will store the signature more flexible to support new fields.
3448                 // Right now we cannot change this since old Friendica versions (prior to 3.5) can only handle this format.
3449                 // (We are transmitting this data here via DFRN)
3450                 $signed_text = $message["guid"].";".$message["parent_guid"].";".
3451                                 $message["text"].";".$message["diaspora_handle"];
3452
3453                 q("INSERT INTO `sign` (`iid`,`signed_text`,`signature`,`signer`) VALUES (%d,'%s','%s','%s')",
3454                         intval($message_id),
3455                         dbesc($signed_text),
3456                         dbesc($message["author_signature"]),
3457                         dbesc($message["diaspora_handle"])
3458                 );
3459
3460                 // This here will replace the lines above, once Diaspora changed its protocol
3461                 //q("INSERT INTO `sign` (`iid`,`signed_text`) VALUES (%d,'%s')",
3462                 //      intval($message_id),
3463                 //      dbesc(json_encode($message))
3464                 //);
3465
3466                 logger('Stored diaspora comment signature');
3467                 return true;
3468         }
3469 }
3470 ?>