src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @file src/Protocol/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  * This implementation here interprets the old and the new protocol and sends the new one.
   8  * In the future we will remove most stuff from "validPosting" and interpret only the new protocol.
   9  */
  10
  11 namespace Friendica\Protocol;
  12
  13 use Friendica\Content\Feature;
  14 use Friendica\Content\Text\BBCode;
  15 use Friendica\Content\Text\Markdown;
  16 use Friendica\Core\Cache;
  17 use Friendica\Core\Config;
  18 use Friendica\Core\L10n;
  19 use Friendica\Core\Logger;
  20 use Friendica\Core\PConfig;
  21 use Friendica\Core\Protocol;
  22 use Friendica\Core\System;
  23 use Friendica\Core\Worker;
  24 use Friendica\Database\DBA;
  25 use Friendica\Model\Contact;
  26 use Friendica\Model\Conversation;
  27 use Friendica\Model\GContact;
  28 use Friendica\Model\Group;
  29 use Friendica\Model\Item;
  30 use Friendica\Model\Mail;
  31 use Friendica\Model\Profile;
  32 use Friendica\Model\User;
  33 use Friendica\Network\Probe;
  34 use Friendica\Util\Crypto;
  35 use Friendica\Util\DateTimeFormat;
  36 use Friendica\Util\Map;
  37 use Friendica\Util\Network;
  38 use Friendica\Util\Strings;
  39 use Friendica\Util\XML;
  40 use Friendica\Worker\Delivery;
  41 use SimpleXMLElement;
  42
  43 /**
  44  * @brief This class contain functions to create and send Diaspora XML files
  45  *
  46  */
  47 class Diaspora
  48 {
  49         /**
  50          * @brief Return a list of relay servers
  51          *
  52          * The list contains not only the official relays but also servers that we serve directly
  53          *
  54          * @param integer $item_id  The id of the item that is sent
  55          * @param array   $contacts The previously fetched contacts
  56          *
  57          * @return array of relay servers
  58          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  59          */
  60         public static function relayList($item_id, array $contacts = [])
  61         {
  62                 $serverlist = [];
  63
  64                 // Fetching relay servers
  65                 $serverdata = Config::get("system", "relay_server");
  66
  67                 if (!empty($serverdata)) {
  68                         $servers = explode(",", $serverdata);
  69                         foreach ($servers as $server) {
  70                                 $serverlist[$server] = trim($server);
  71                         }
  72                 }
  73
  74                 if (Config::get("system", "relay_directly", false)) {
  75                         // We distribute our stuff based on the parent to ensure that the thread will be complete
  76                         $parent = Item::selectFirst(['parent'], ['id' => $item_id]);
  77                         if (!DBA::isResult($parent)) {
  78                                 return;
  79                         }
  80
  81                         // Servers that want to get all content
  82                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
  83                         while ($server = DBA::fetch($servers)) {
  84                                 $serverlist[$server['url']] = $server['url'];
  85                         }
  86
  87                         // All tags of the current post
  88                         $condition = ['otype' => TERM_OBJ_POST, 'type' => TERM_HASHTAG, 'oid' => $parent['parent']];
  89                         $tags = DBA::select('term', ['term'], $condition);
  90                         $taglist = [];
  91                         while ($tag = DBA::fetch($tags)) {
  92                                 $taglist[] = $tag['term'];
  93                         }
  94
  95                         // All servers who wants content with this tag
  96                         $tagserverlist = [];
  97                         if (!empty($taglist)) {
  98                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
  99                                 while ($server = DBA::fetch($tagserver)) {
 100                                         $tagserverlist[] = $server['gserver-id'];
 101                                 }
 102                         }
 103
 104                         // All adresses with the given id
 105                         if (!empty($tagserverlist)) {
 106                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 107                                 while ($server = DBA::fetch($servers)) {
 108                                         $serverlist[$server['url']] = $server['url'];
 109                                 }
 110                         }
 111                 }
 112
 113                 // Now we are collecting all relay contacts
 114                 foreach ($serverlist as $server_url) {
 115                         // We don't send messages to ourselves
 116                         if (Strings::compareLink($server_url, System::baseUrl())) {
 117                                 continue;
 118                         }
 119                         $contact = self::getRelayContact($server_url);
 120                         if (is_bool($contact)) {
 121                                 continue;
 122                         }
 123
 124                         $exists = false;
 125                         foreach ($contacts as $entry) {
 126                                 if ($entry['batch'] == $contact['batch']) {
 127                                         $exists = true;
 128                                 }
 129                         }
 130
 131                         if (!$exists) {
 132                                 $contacts[] = $contact;
 133                         }
 134                 }
 135
 136                 return $contacts;
 137         }
 138
 139         /**
 140          * @brief Return a contact for a given server address or creates a dummy entry
 141          *
 142          * @param string $server_url The url of the server
 143          * @return array with the contact
 144          * @throws \Exception
 145          */
 146         private static function getRelayContact($server_url)
 147         {
 148                 $fields = ['batch', 'id', 'name', 'network', 'protocol', 'archive', 'blocked'];
 149
 150                 // Fetch the relay contact
 151                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 152                         'contact-type' => Contact::TYPE_RELAY];
 153                 $contact = DBA::selectFirst('contact', $fields, $condition);
 154
 155                 if (DBA::isResult($contact)) {
 156                         if ($contact['archive'] || $contact['blocked']) {
 157                                 return false;
 158                         }
 159                         return $contact;
 160                 } else {
 161                         self::setRelayContact($server_url);
 162
 163                         $contact = DBA::selectFirst('contact', $fields, $condition);
 164                         if (DBA::isResult($contact)) {
 165                                 return $contact;
 166                         }
 167                 }
 168
 169                 // It should never happen that we arrive here
 170                 return [];
 171         }
 172
 173         /**
 174          * @brief Update or insert a relay contact
 175          *
 176          * @param string $server_url     The url of the server
 177          * @param array  $network_fields Optional network specific fields
 178          * @throws \Exception
 179          */
 180         public static function setRelayContact($server_url, array $network_fields = [])
 181         {
 182                 $fields = ['created' => DateTimeFormat::utcNow(),
 183                         'name' => 'relay', 'nick' => 'relay', 'url' => $server_url,
 184                         'nurl' => Strings::normaliseLink($server_url),
 185                         'network' => Protocol::DIASPORA, 'uid' => 0,
 186                         'batch' => $server_url . '/receive/public',
 187                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 188                         'pending' => false, 'writable' => true,
 189                         'baseurl' => $server_url, 'contact-type' => Contact::TYPE_RELAY];
 190
 191                 $fields = array_merge($fields, $network_fields);
 192
 193                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url)];
 194                 $old = DBA::selectFirst('contact', [], $condition);
 195                 if (DBA::isResult($old)) {
 196                         unset($fields['created']);
 197                         $condition = ['id' => $old['id']];
 198
 199                         Logger::info('Update relay contact', ['fields' => $fields, 'condition' => $condition]);
 200                         DBA::update('contact', $fields, $condition, $old);
 201                 } else {
 202                         Logger::info('Create relay contact', ['fields' => $fields]);
 203                         DBA::insert('contact', $fields);
 204                 }
 205         }
 206
 207         /**
 208          * @brief Return a list of participating contacts for a thread
 209          *
 210          * This is used for the participation feature.
 211          * One of the parameters is a contact array.
 212          * This is done to avoid duplicates.
 213          *
 214          * @param integer $thread   The id of the thread
 215          * @param array   $contacts The previously fetched contacts
 216          *
 217          * @return array of relay servers
 218          * @throws \Exception
 219          */
 220         public static function participantsForThread($thread, array $contacts)
 221         {
 222                 $r = DBA::p("SELECT `contact`.`batch`, `contact`.`id`, `contact`.`name`, `contact`.`network`, `contact`.`protocol`,
 223                                 `fcontact`.`batch` AS `fbatch`, `fcontact`.`network` AS `fnetwork` FROM `participation`
 224                                 INNER JOIN `contact` ON `contact`.`id` = `participation`.`cid`
 225                                 INNER JOIN `fcontact` ON `fcontact`.`id` = `participation`.`fid`
 226                                 WHERE `participation`.`iid` = ?", $thread);
 227
 228                 while ($contact = DBA::fetch($r)) {
 229                         if (!empty($contact['fnetwork'])) {
 230                                 $contact['network'] = $contact['fnetwork'];
 231                         }
 232                         unset($contact['fnetwork']);
 233
 234                         if (empty($contact['protocol'])) {
 235                                 $contact['protocol'] = $contact['network'];
 236                         }
 237
 238                         if (empty($contact['batch']) && !empty($contact['fbatch'])) {
 239                                 $contact['batch'] = $contact['fbatch'];
 240                         }
 241                         unset($contact['fbatch']);
 242
 243                         $exists = false;
 244                         foreach ($contacts as $entry) {
 245                                 if ($entry['batch'] == $contact['batch']) {
 246                                         $exists = true;
 247                                 }
 248                         }
 249
 250                         if (!$exists) {
 251                                 $contacts[] = $contact;
 252                         }
 253                 }
 254                 DBA::close($r);
 255
 256                 return $contacts;
 257         }
 258
 259         /**
 260          * @brief repairs a signature that was double encoded
 261          *
 262          * The function is unused at the moment. It was copied from the old implementation.
 263          *
 264          * @param string  $signature The signature
 265          * @param string  $handle    The handle of the signature owner
 266          * @param integer $level     This value is only set inside this function to avoid endless loops
 267          *
 268          * @return string the repaired signature
 269          * @throws \Exception
 270          */
 271         private static function repairSignature($signature, $handle = "", $level = 1)
 272         {
 273                 if ($signature == "") {
 274                         return ($signature);
 275                 }
 276
 277                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 278                         $signature = base64_decode($signature);
 279                         Logger::log("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, Logger::DEBUG);
 280
 281                         // Do a recursive call to be able to fix even multiple levels
 282                         if ($level < 10) {
 283                                 $signature = self::repairSignature($signature, $handle, ++$level);
 284                         }
 285                 }
 286
 287                 return($signature);
 288         }
 289
 290         /**
 291          * @brief verify the envelope and return the verified data
 292          *
 293          * @param string $envelope The magic envelope
 294          *
 295          * @return string verified data
 296          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 297          * @throws \ImagickException
 298          */
 299         private static function verifyMagicEnvelope($envelope)
 300         {
 301                 $basedom = XML::parseString($envelope);
 302
 303                 if (!is_object($basedom)) {
 304                         Logger::log("Envelope is no XML file");
 305                         return false;
 306                 }
 307
 308                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 309
 310                 if (sizeof($children) == 0) {
 311                         Logger::log("XML has no children");
 312                         return false;
 313                 }
 314
 315                 $handle = "";
 316
 317                 $data = Strings::base64UrlDecode($children->data);
 318                 $type = $children->data->attributes()->type[0];
 319
 320                 $encoding = $children->encoding;
 321
 322                 $alg = $children->alg;
 323
 324                 $sig = Strings::base64UrlDecode($children->sig);
 325                 $key_id = $children->sig->attributes()->key_id[0];
 326                 if ($key_id != "") {
 327                         $handle = Strings::base64UrlDecode($key_id);
 328                 }
 329
 330                 $b64url_data = Strings::base64UrlEncode($data);
 331                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 332
 333                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 334
 335                 if ($handle == '') {
 336                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 337                         return false;
 338                 }
 339
 340                 $key = self::key($handle);
 341                 if ($key == '') {
 342                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 343                         return false;
 344                 }
 345
 346                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 347                 if (!$verify) {
 348                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 349                         return false;
 350                 }
 351
 352                 return $data;
 353         }
 354
 355         /**
 356          * @brief encrypts data via AES
 357          *
 358          * @param string $key  The AES key
 359          * @param string $iv   The IV (is used for CBC encoding)
 360          * @param string $data The data that is to be encrypted
 361          *
 362          * @return string encrypted data
 363          */
 364         private static function aesEncrypt($key, $iv, $data)
 365         {
 366                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 367         }
 368
 369         /**
 370          * @brief decrypts data via AES
 371          *
 372          * @param string $key       The AES key
 373          * @param string $iv        The IV (is used for CBC encoding)
 374          * @param string $encrypted The encrypted data
 375          *
 376          * @return string decrypted data
 377          */
 378         private static function aesDecrypt($key, $iv, $encrypted)
 379         {
 380                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 381         }
 382
 383         /**
 384          * @brief: Decodes incoming Diaspora message in the new format
 385          *
 386          * @param array   $importer Array of the importer user
 387          * @param string  $raw      raw post message
 388          * @param boolean $no_exit  Don't do an http exit on error
 389          *
 390          * @return array
 391          * 'message' -> decoded Diaspora XML message
 392          * 'author' -> author diaspora handle
 393          * 'key' -> author public key (converted to pkcs#8)
 394          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 395          * @throws \ImagickException
 396          */
 397         public static function decodeRaw(array $importer, $raw, $no_exit = false)
 398         {
 399                 $data = json_decode($raw);
 400
 401                 // Is it a private post? Then decrypt the outer Salmon
 402                 if (is_object($data)) {
 403                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 404                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 405
 406                         $outer_key_bundle = '';
 407                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 408                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 409
 410                         if (!is_object($j_outer_key_bundle)) {
 411                                 Logger::log('Outer Salmon did not verify. Discarding.');
 412                                 if ($no_exit) {
 413                                         return false;
 414                                 } else {
 415                                         throw new \Friendica\Network\HTTPException\BadRequestException();
 416                                 }
 417                         }
 418
 419                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 420                         $outer_key = base64_decode($j_outer_key_bundle->key);
 421
 422                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 423                 } else {
 424                         $xml = $raw;
 425                 }
 426
 427                 $basedom = XML::parseString($xml);
 428
 429                 if (!is_object($basedom)) {
 430                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 431                         if ($no_exit) {
 432                                 return false;
 433                         } else {
 434                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 435                         }
 436                 }
 437
 438                 $base = $basedom->children(NAMESPACE_SALMON_ME);
 439
 440                 // Not sure if this cleaning is needed
 441                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 442
 443                 // Build the signed data
 444                 $type = $base->data[0]->attributes()->type[0];
 445                 $encoding = $base->encoding;
 446                 $alg = $base->alg;
 447                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 448
 449                 // This is the signature
 450                 $signature = Strings::base64UrlDecode($base->sig);
 451
 452                 // Get the senders' public key
 453                 $key_id = $base->sig[0]->attributes()->key_id[0];
 454                 $author_addr = base64_decode($key_id);
 455                 if ($author_addr == '') {
 456                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 457                         if ($no_exit) {
 458                                 return false;
 459                         } else {
 460                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 461                         }
 462                 }
 463
 464                 $key = self::key($author_addr);
 465                 if ($key == '') {
 466                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 467                         if ($no_exit) {
 468                                 return false;
 469                         } else {
 470                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 471                         }
 472                 }
 473
 474                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 475                 if (!$verify) {
 476                         Logger::log('Message did not verify. Discarding.');
 477                         if ($no_exit) {
 478                                 return false;
 479                         } else {
 480                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 481                         }
 482                 }
 483
 484                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 485                                 'author' => XML::unescape($author_addr),
 486                                 'key' => (string)$key];
 487         }
 488
 489         /**
 490          * @brief: Decodes incoming Diaspora message in the deprecated format
 491          *
 492          * @param array  $importer Array of the importer user
 493          * @param string $xml      urldecoded Diaspora salmon
 494          *
 495          * @return array
 496          * 'message' -> decoded Diaspora XML message
 497          * 'author' -> author diaspora handle
 498          * 'key' -> author public key (converted to pkcs#8)
 499          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 500          * @throws \ImagickException
 501          */
 502         public static function decode(array $importer, $xml)
 503         {
 504                 $public = false;
 505                 $basedom = XML::parseString($xml);
 506
 507                 if (!is_object($basedom)) {
 508                         Logger::log("XML is not parseable.");
 509                         return false;
 510                 }
 511                 $children = $basedom->children('https://joindiaspora.com/protocol');
 512
 513                 $inner_aes_key = null;
 514                 $inner_iv = null;
 515
 516                 if ($children->header) {
 517                         $public = true;
 518                         $author_link = str_replace('acct:', '', $children->header->author_id);
 519                 } else {
 520                         // This happens with posts from a relais
 521                         if (!$importer) {
 522                                 Logger::log("This is no private post in the old format", Logger::DEBUG);
 523                                 return false;
 524                         }
 525
 526                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 527
 528                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 529                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 530
 531                         $outer_key_bundle = '';
 532                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $importer['prvkey']);
 533
 534                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 535
 536                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 537                         $outer_key = base64_decode($j_outer_key_bundle->key);
 538
 539                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 540
 541                         Logger::log('decrypted: '.$decrypted, Logger::DEBUG);
 542                         $idom = XML::parseString($decrypted);
 543
 544                         $inner_iv = base64_decode($idom->iv);
 545                         $inner_aes_key = base64_decode($idom->aes_key);
 546
 547                         $author_link = str_replace('acct:', '', $idom->author_id);
 548                 }
 549
 550                 $dom = $basedom->children(NAMESPACE_SALMON_ME);
 551
 552                 // figure out where in the DOM tree our data is hiding
 553
 554                 $base = null;
 555                 if ($dom->provenance->data) {
 556                         $base = $dom->provenance;
 557                 } elseif ($dom->env->data) {
 558                         $base = $dom->env;
 559                 } elseif ($dom->data) {
 560                         $base = $dom;
 561                 }
 562
 563                 if (!$base) {
 564                         Logger::log('unable to locate salmon data in xml');
 565                         throw new \Friendica\Network\HTTPException\BadRequestException();
 566                 }
 567
 568
 569                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 570                 $signature = Strings::base64UrlDecode($base->sig);
 571
 572                 // unpack the  data
 573
 574                 // strip whitespace so our data element will return to one big base64 blob
 575                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 576
 577
 578                 // stash away some other stuff for later
 579
 580                 $type = $base->data[0]->attributes()->type[0];
 581                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 582                 $encoding = $base->encoding;
 583                 $alg = $base->alg;
 584
 585
 586                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 587
 588
 589                 // decode the data
 590                 $data = Strings::base64UrlDecode($data);
 591
 592
 593                 if ($public) {
 594                         $inner_decrypted = $data;
 595                 } else {
 596                         // Decode the encrypted blob
 597                         $inner_encrypted = base64_decode($data);
 598                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 599                 }
 600
 601                 if (!$author_link) {
 602                         Logger::log('Could not retrieve author URI.');
 603                         throw new \Friendica\Network\HTTPException\BadRequestException();
 604                 }
 605                 // Once we have the author URI, go to the web and try to find their public key
 606                 // (first this will look it up locally if it is in the fcontact cache)
 607                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 608
 609                 Logger::log('Fetching key for '.$author_link);
 610                 $key = self::key($author_link);
 611
 612                 if (!$key) {
 613                         Logger::log('Could not retrieve author key.');
 614                         throw new \Friendica\Network\HTTPException\BadRequestException();
 615                 }
 616
 617                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 618
 619                 if (!$verify) {
 620                         Logger::log('Message did not verify. Discarding.');
 621                         throw new \Friendica\Network\HTTPException\BadRequestException();
 622                 }
 623
 624                 Logger::log('Message verified.');
 625
 626                 return ['message' => (string)$inner_decrypted,
 627                                 'author' => XML::unescape($author_link),
 628                                 'key' => (string)$key];
 629         }
 630
 631
 632         /**
 633          * @brief Dispatches public messages and find the fitting receivers
 634          *
 635          * @param array $msg The post that will be dispatched
 636          *
 637          * @return int The message id of the generated message, "true" or "false" if there was an error
 638          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 639          * @throws \ImagickException
 640          */
 641         public static function dispatchPublic($msg)
 642         {
 643                 $enabled = intval(Config::get("system", "diaspora_enabled"));
 644                 if (!$enabled) {
 645                         Logger::log("diaspora is disabled");
 646                         return false;
 647                 }
 648
 649                 if (!($fields = self::validPosting($msg))) {
 650                         Logger::log("Invalid posting");
 651                         return false;
 652                 }
 653
 654                 $importer = ["uid" => 0, "page-flags" => User::PAGE_FLAGS_FREELOVE];
 655                 $success = self::dispatch($importer, $msg, $fields);
 656
 657                 return $success;
 658         }
 659
 660         /**
 661          * @brief Dispatches the different message types to the different functions
 662          *
 663          * @param array            $importer Array of the importer user
 664          * @param array            $msg      The post that will be dispatched
 665          * @param SimpleXMLElement $fields   SimpleXML object that contains the message
 666          *
 667          * @return int The message id of the generated message, "true" or "false" if there was an error
 668          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 669          * @throws \ImagickException
 670          */
 671         public static function dispatch(array $importer, $msg, SimpleXMLElement $fields = null)
 672         {
 673                 // The sender is the handle of the contact that sent the message.
 674                 // This will often be different with relayed messages (for example "like" and "comment")
 675                 $sender = $msg["author"];
 676
 677                 // This is only needed for private postings since this is already done for public ones before
 678                 if (is_null($fields)) {
 679                         $private = true;
 680                         if (!($fields = self::validPosting($msg))) {
 681                                 Logger::log("Invalid posting");
 682                                 return false;
 683                         }
 684                 } else {
 685                         $private = false;
 686                 }
 687
 688                 $type = $fields->getName();
 689
 690                 Logger::log("Received message type ".$type." from ".$sender." for user ".$importer["uid"], Logger::DEBUG);
 691
 692                 switch ($type) {
 693                         case "account_migration":
 694                                 if (!$private) {
 695                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 696                                         return false;
 697                                 }
 698                                 return self::receiveAccountMigration($importer, $fields);
 699
 700                         case "account_deletion":
 701                                 return self::receiveAccountDeletion($fields);
 702
 703                         case "comment":
 704                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 705
 706                         case "contact":
 707                                 if (!$private) {
 708                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 709                                         return false;
 710                                 }
 711                                 return self::receiveContactRequest($importer, $fields);
 712
 713                         case "conversation":
 714                                 if (!$private) {
 715                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 716                                         return false;
 717                                 }
 718                                 return self::receiveConversation($importer, $msg, $fields);
 719
 720                         case "like":
 721                                 return self::receiveLike($importer, $sender, $fields);
 722
 723                         case "message":
 724                                 if (!$private) {
 725                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 726                                         return false;
 727                                 }
 728                                 return self::receiveMessage($importer, $fields);
 729
 730                         case "participation":
 731                                 if (!$private) {
 732                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 733                                         return false;
 734                                 }
 735                                 return self::receiveParticipation($importer, $fields);
 736
 737                         case "photo": // Not implemented
 738                                 return self::receivePhoto($importer, $fields);
 739
 740                         case "poll_participation": // Not implemented
 741                                 return self::receivePollParticipation($importer, $fields);
 742
 743                         case "profile":
 744                                 if (!$private) {
 745                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 746                                         return false;
 747                                 }
 748                                 return self::receiveProfile($importer, $fields);
 749
 750                         case "reshare":
 751                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 752
 753                         case "retraction":
 754                                 return self::receiveRetraction($importer, $sender, $fields);
 755
 756                         case "status_message":
 757                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 758
 759                         default:
 760                                 Logger::log("Unknown message type ".$type);
 761                                 return false;
 762                 }
 763         }
 764
 765         /**
 766          * @brief Checks if a posting is valid and fetches the data fields.
 767          *
 768          * This function does not only check the signature.
 769          * It also does the conversion between the old and the new diaspora format.
 770          *
 771          * @param array $msg Array with the XML, the sender handle and the sender signature
 772          *
 773          * @return bool|SimpleXMLElement If the posting is valid then an array with an SimpleXML object is returned
 774          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 775          * @throws \ImagickException
 776          */
 777         private static function validPosting($msg)
 778         {
 779                 $data = XML::parseString($msg["message"]);
 780
 781                 if (!is_object($data)) {
 782                         Logger::log("No valid XML ".$msg["message"], Logger::DEBUG);
 783                         return false;
 784                 }
 785
 786                 // Is this the new or the old version?
 787                 if ($data->getName() == "XML") {
 788                         $oldXML = true;
 789                         foreach ($data->post->children() as $child) {
 790                                 $element = $child;
 791                         }
 792                 } else {
 793                         $oldXML = false;
 794                         $element = $data;
 795                 }
 796
 797                 $type = $element->getName();
 798                 $orig_type = $type;
 799
 800                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 801
 802                 // All retractions are handled identically from now on.
 803                 // In the new version there will only be "retraction".
 804                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 805                         $type = "retraction";
 806
 807                 if ($type == "request") {
 808                         $type = "contact";
 809                 }
 810
 811                 $fields = new SimpleXMLElement("<".$type."/>");
 812
 813                 $signed_data = "";
 814                 $author_signature = null;
 815                 $parent_author_signature = null;
 816
 817                 foreach ($element->children() as $fieldname => $entry) {
 818                         if ($oldXML) {
 819                                 // Translation for the old XML structure
 820                                 if ($fieldname == "diaspora_handle") {
 821                                         $fieldname = "author";
 822                                 }
 823                                 if ($fieldname == "participant_handles") {
 824                                         $fieldname = "participants";
 825                                 }
 826                                 if (in_array($type, ["like", "participation"])) {
 827                                         if ($fieldname == "target_type") {
 828                                                 $fieldname = "parent_type";
 829                                         }
 830                                 }
 831                                 if ($fieldname == "sender_handle") {
 832                                         $fieldname = "author";
 833                                 }
 834                                 if ($fieldname == "recipient_handle") {
 835                                         $fieldname = "recipient";
 836                                 }
 837                                 if ($fieldname == "root_diaspora_id") {
 838                                         $fieldname = "root_author";
 839                                 }
 840                                 if ($type == "status_message") {
 841                                         if ($fieldname == "raw_message") {
 842                                                 $fieldname = "text";
 843                                         }
 844                                 }
 845                                 if ($type == "retraction") {
 846                                         if ($fieldname == "post_guid") {
 847                                                 $fieldname = "target_guid";
 848                                         }
 849                                         if ($fieldname == "type") {
 850                                                 $fieldname = "target_type";
 851                                         }
 852                                 }
 853                         }
 854
 855                         if (($fieldname == "author_signature") && ($entry != "")) {
 856                                 $author_signature = base64_decode($entry);
 857                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 858                                 $parent_author_signature = base64_decode($entry);
 859                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 860                                 if ($signed_data != "") {
 861                                         $signed_data .= ";";
 862                                 }
 863
 864                                 $signed_data .= $entry;
 865                         }
 866                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 867                                 || ($orig_type == "relayable_retraction")
 868                         ) {
 869                                 XML::copy($entry, $fields, $fieldname);
 870                         }
 871                 }
 872
 873                 // This is something that shouldn't happen at all.
 874                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 875                         if ($msg["author"] != $fields->author) {
 876                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 877                                 return false;
 878                         }
 879                 }
 880
 881                 // Only some message types have signatures. So we quit here for the other types.
 882                 if (!in_array($type, ["comment", "like"])) {
 883                         return $fields;
 884                 }
 885                 // No author_signature? This is a must, so we quit.
 886                 if (!isset($author_signature)) {
 887                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 888                         return false;
 889                 }
 890
 891                 if (isset($parent_author_signature)) {
 892                         $key = self::key($msg["author"]);
 893                         if (empty($key)) {
 894                                 Logger::log("No key found for parent author ".$msg["author"], Logger::DEBUG);
 895                                 return false;
 896                         }
 897
 898                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 899                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 900                                 return false;
 901                         }
 902                 }
 903
 904                 $key = self::key($fields->author);
 905                 if (empty($key)) {
 906                         Logger::log("No key found for author ".$fields->author, Logger::DEBUG);
 907                         return false;
 908                 }
 909
 910                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 911                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 912                         return false;
 913                 } else {
 914                         return $fields;
 915                 }
 916         }
 917
 918         /**
 919          * @brief Fetches the public key for a given handle
 920          *
 921          * @param string $handle The handle
 922          *
 923          * @return string The public key
 924          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 925          * @throws \ImagickException
 926          */
 927         private static function key($handle)
 928         {
 929                 $handle = strval($handle);
 930
 931                 Logger::log("Fetching diaspora key for: ".$handle);
 932
 933                 $r = self::personByHandle($handle);
 934                 if ($r) {
 935                         return $r["pubkey"];
 936                 }
 937
 938                 return "";
 939         }
 940
 941         /**
 942          * @brief Fetches data for a given handle
 943          *
 944          * @param string $handle The handle
 945          *
 946          * @return array the queried data
 947          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 948          * @throws \ImagickException
 949          */
 950         public static function personByHandle($handle)
 951         {
 952                 $update = false;
 953
 954                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 955                 if (DBA::isResult($person)) {
 956                         Logger::debug("In cache " . print_r($person, true));
 957
 958                         // update record occasionally so it doesn't get stale
 959                         $d = strtotime($person["updated"]." +00:00");
 960                         if ($d < strtotime("now - 14 days")) {
 961                                 $update = true;
 962                         }
 963
 964                         if ($person["guid"] == "") {
 965                                 $update = true;
 966                         }
 967                 }
 968
 969                 if (!DBA::isResult($person) || $update) {
 970                         Logger::log("create or refresh", Logger::DEBUG);
 971                         $r = Probe::uri($handle, Protocol::DIASPORA);
 972
 973                         // Note that Friendica contacts will return a "Diaspora person"
 974                         // if Diaspora connectivity is enabled on their server
 975                         if ($r && ($r["network"] === Protocol::DIASPORA)) {
 976                                 self::updateFContact($r);
 977
 978                                 // Fetch the updated or added contact
 979                                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 980                                 if (!DBA::isResult($person)) {
 981                                         $person = $r;
 982                                         $person['id'] = 0;
 983                                 }
 984                         }
 985                 }
 986
 987                 return $person;
 988         }
 989
 990         /**
 991          * @brief Updates the fcontact table
 992          *
 993          * @param array $arr The fcontact data
 994          * @throws \Exception
 995          */
 996         private static function updateFContact($arr)
 997         {
 998                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
 999                         'request' => $arr["request"], 'nick' => $arr["nick"],
1000                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
1001                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
1002                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
1003                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
1004                         'updated' => DateTimeFormat::utcNow()];
1005
1006                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
1007
1008                 DBA::update('fcontact', $fields, $condition, true);
1009         }
1010
1011         /**
1012          * @brief get a handle (user@domain.tld) from a given contact id
1013          *
1014          * @param int $contact_id  The id in the contact table
1015          * @param int $pcontact_id The id in the contact table (Used for the public contact)
1016          *
1017          * @return string the handle
1018          * @throws \Exception
1019          */
1020         private static function handleFromContact($contact_id, $pcontact_id = 0)
1021         {
1022                 $handle = false;
1023
1024                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
1025
1026                 if ($pcontact_id != 0) {
1027                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
1028
1029                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
1030                                 return strtolower($contact["addr"]);
1031                         }
1032                 }
1033
1034                 $r = q(
1035                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1036                         intval($contact_id)
1037                 );
1038
1039                 if (DBA::isResult($r)) {
1040                         $contact = $r[0];
1041
1042                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
1043
1044                         if ($contact['addr'] != "") {
1045                                 $handle = $contact['addr'];
1046                         } else {
1047                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1048                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1049                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1050                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1051                                 $handle = $contact['nick'].'@'.$baseurl;
1052                         }
1053                 }
1054
1055                 return strtolower($handle);
1056         }
1057
1058         /**
1059          * @brief get a url (scheme://domain.tld/u/user) from a given Diaspora*
1060          * fcontact guid
1061          *
1062          * @param mixed $fcontact_guid Hexadecimal string guid
1063          *
1064          * @return string the contact url or null
1065          * @throws \Exception
1066          */
1067         public static function urlFromContactGuid($fcontact_guid)
1068         {
1069                 Logger::log("fcontact guid is ".$fcontact_guid, Logger::DEBUG);
1070
1071                 $r = q(
1072                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1073                         DBA::escape(Protocol::DIASPORA),
1074                         DBA::escape($fcontact_guid)
1075                 );
1076
1077                 if (DBA::isResult($r)) {
1078                         return $r[0]['url'];
1079                 }
1080
1081                 return null;
1082         }
1083
1084         /**
1085          * @brief Get a contact id for a given handle
1086          *
1087          * @todo  Move to Friendica\Model\Contact
1088          *
1089          * @param int    $uid    The user id
1090          * @param string $handle The handle in the format user@domain.tld
1091          *
1092          * @return array Contact data
1093          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1094          * @throws \ImagickException
1095          */
1096         private static function contactByHandle($uid, $handle)
1097         {
1098                 $cid = Contact::getIdForURL($handle, $uid);
1099                 if (!$cid) {
1100                         $handle_parts = explode("@", $handle);
1101                         $nurl_sql = "%%://" . $handle_parts[1] . "%%/profile/" . $handle_parts[0];
1102                         $cid = Contact::getIdForURL($nurl_sql, $uid);
1103                 }
1104
1105                 if (!$cid) {
1106                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1107                         return false;
1108                 }
1109
1110                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1111                 if (!DBA::isResult($contact)) {
1112                         // This here shouldn't happen at all
1113                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1114                         return false;
1115                 }
1116
1117                 return $contact;
1118         }
1119
1120         /**
1121          * @brief Check if posting is allowed for this contact
1122          *
1123          * @param array $importer   Array of the importer user
1124          * @param array $contact    The contact that is checked
1125          * @param bool  $is_comment Is the check for a comment?
1126          *
1127          * @return bool is the contact allowed to post?
1128          */
1129         private static function postAllow(array $importer, array $contact, $is_comment = false)
1130         {
1131                 /*
1132                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1133                  * That makes us friends.
1134                  * Normally this should have handled by getting a request - but this could get lost
1135                  */
1136                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1137                 // It is not removed by now. Possibly the code is needed?
1138                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(User::PAGE_FLAGS_FREELOVE))) {
1139                 //      DBA::update(
1140                 //              'contact',
1141                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1142                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1143                 //      );
1144                 //
1145                 //      $contact["rel"] = Contact::FRIEND;
1146                 //      Logger::log("defining user ".$contact["nick"]." as friend");
1147                 //}
1148
1149                 // Contact server is blocked
1150                 if (Network::isUrlBlocked($contact['url'])) {
1151                         return false;
1152                         // We don't seem to like that person
1153                 } elseif ($contact["blocked"]) {
1154                         // Maybe blocked, don't accept.
1155                         return false;
1156                         // We are following this person?
1157                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1158                         // Yes, then it is fine.
1159                         return true;
1160                         // Is it a post to a community?
1161                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
1162                         // That's good
1163                         return true;
1164                         // Is the message a global user or a comment?
1165                 } elseif (($importer["uid"] == 0) || $is_comment) {
1166                         // Messages for the global users and comments are always accepted
1167                         return true;
1168                 }
1169
1170                 return false;
1171         }
1172
1173         /**
1174          * @brief Fetches the contact id for a handle and checks if posting is allowed
1175          *
1176          * @param array  $importer   Array of the importer user
1177          * @param string $handle     The checked handle in the format user@domain.tld
1178          * @param bool   $is_comment Is the check for a comment?
1179          *
1180          * @return array The contact data
1181          * @throws \Exception
1182          */
1183         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
1184         {
1185                 $contact = self::contactByHandle($importer["uid"], $handle);
1186                 if (!$contact) {
1187                         Logger::log("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1188                         // If a contact isn't found, we accept it anyway if it is a comment
1189                         if ($is_comment && ($importer["uid"] != 0)) {
1190                                 return self::contactByHandle(0, $handle);
1191                         } elseif ($is_comment) {
1192                                 return $importer;
1193                         } else {
1194                                 return false;
1195                         }
1196                 }
1197
1198                 if (!self::postAllow($importer, $contact, $is_comment)) {
1199                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1200                         return false;
1201                 }
1202                 return $contact;
1203         }
1204
1205         /**
1206          * @brief Does the message already exists on the system?
1207          *
1208          * @param int    $uid  The user id
1209          * @param string $guid The guid of the message
1210          *
1211          * @return int|bool message id if the message already was stored into the system - or false.
1212          * @throws \Exception
1213          */
1214         private static function messageExists($uid, $guid)
1215         {
1216                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1217                 if (DBA::isResult($item)) {
1218                         Logger::log("message ".$guid." already exists for user ".$uid);
1219                         return $item["id"];
1220                 }
1221
1222                 return false;
1223         }
1224
1225         /**
1226          * @brief Checks for links to posts in a message
1227          *
1228          * @param array $item The item array
1229          * @return void
1230          */
1231         private static function fetchGuid(array $item)
1232         {
1233                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1234                 preg_replace_callback(
1235                         $expression,
1236                         function ($match) use ($item) {
1237                                 self::fetchGuidSub($match, $item);
1238                         },
1239                         $item["body"]
1240                 );
1241
1242                 preg_replace_callback(
1243                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1244                         function ($match) use ($item) {
1245                                 self::fetchGuidSub($match, $item);
1246                         },
1247                         $item["body"]
1248                 );
1249         }
1250
1251         /**
1252          * @brief Checks for relative /people/* links in an item body to match local
1253          * contacts or prepends the remote host taken from the author link.
1254          *
1255          * @param string $body        The item body to replace links from
1256          * @param string $author_link The author link for missing local contact fallback
1257          *
1258          * @return string the replaced string
1259          */
1260         public static function replacePeopleGuid($body, $author_link)
1261         {
1262                 $return = preg_replace_callback(
1263                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1264                         function ($match) use ($author_link) {
1265                                 // $match
1266                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1267                                 // 1 => '0123456789abcdef'
1268                                 // 2 => 'Foo Bar'
1269                                 $handle = self::urlFromContactGuid($match[1]);
1270
1271                                 if ($handle) {
1272                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1273                                 } else {
1274                                         // No local match, restoring absolute remote URL from author scheme and host
1275                                         $author_url = parse_url($author_link);
1276                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1277                                 }
1278
1279                                 return $return;
1280                         },
1281                         $body
1282                 );
1283
1284                 return $return;
1285         }
1286
1287         /**
1288          * @brief sub function of "fetchGuid" which checks for links in messages
1289          *
1290          * @param array $match array containing a link that has to be checked for a message link
1291          * @param array $item  The item array
1292          * @return void
1293          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1294          * @throws \ImagickException
1295          */
1296         private static function fetchGuidSub($match, $item)
1297         {
1298                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1299                         self::storeByGuid($match[1], $item["owner-link"]);
1300                 }
1301         }
1302
1303         /**
1304          * @brief Fetches an item with a given guid from a given server
1305          *
1306          * @param string $guid   the message guid
1307          * @param string $server The server address
1308          * @param int    $uid    The user id of the user
1309          *
1310          * @return int the message id of the stored message or false
1311          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1312          * @throws \ImagickException
1313          */
1314         private static function storeByGuid($guid, $server, $uid = 0)
1315         {
1316                 $serverparts = parse_url($server);
1317
1318                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1319                         return false;
1320                 }
1321
1322                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1323
1324                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1325
1326                 $msg = self::message($guid, $server);
1327
1328                 if (!$msg) {
1329                         return false;
1330                 }
1331
1332                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1333
1334                 // Now call the dispatcher
1335                 return self::dispatchPublic($msg);
1336         }
1337
1338         /**
1339          * @brief Fetches a message from a server
1340          *
1341          * @param string $guid   message guid
1342          * @param string $server The url of the server
1343          * @param int    $level  Endless loop prevention
1344          *
1345          * @return array
1346          *      'message' => The message XML
1347          *      'author' => The author handle
1348          *      'key' => The public key of the author
1349          * @throws \Exception
1350          */
1351         private static function message($guid, $server, $level = 0)
1352         {
1353                 if ($level > 5) {
1354                         return false;
1355                 }
1356
1357                 // This will work for new Diaspora servers and Friendica servers from 3.5
1358                 $source_url = $server."/fetch/post/".urlencode($guid);
1359
1360                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1361
1362                 $envelope = Network::fetchUrl($source_url);
1363                 if ($envelope) {
1364                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1365                         $x = self::verifyMagicEnvelope($envelope);
1366                         if (!$x) {
1367                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1368                         } else {
1369                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1370                         }
1371                 } else {
1372                         $x = false;
1373                 }
1374
1375                 if (!$x) {
1376                         return false;
1377                 }
1378
1379                 $source_xml = XML::parseString($x);
1380
1381                 if (!is_object($source_xml)) {
1382                         return false;
1383                 }
1384
1385                 if ($source_xml->post->reshare) {
1386                         // Reshare of a reshare - old Diaspora version
1387                         Logger::log("Message is a reshare", Logger::DEBUG);
1388                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1389                 } elseif ($source_xml->getName() == "reshare") {
1390                         // Reshare of a reshare - new Diaspora version
1391                         Logger::log("Message is a new reshare", Logger::DEBUG);
1392                         return self::message($source_xml->root_guid, $server, ++$level);
1393                 }
1394
1395                 $author = "";
1396
1397                 // Fetch the author - for the old and the new Diaspora version
1398                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1399                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1400                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1401                         $author = (string)$source_xml->author;
1402                 }
1403
1404                 // If this isn't a "status_message" then quit
1405                 if (!$author) {
1406                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1407                         return false;
1408                 }
1409
1410                 $msg = ["message" => $x, "author" => $author];
1411
1412                 $msg["key"] = self::key($msg["author"]);
1413
1414                 return $msg;
1415         }
1416
1417         /**
1418          * @brief Fetches the item record of a given guid
1419          *
1420          * @param int    $uid     The user id
1421          * @param string $guid    message guid
1422          * @param string $author  The handle of the item
1423          * @param array  $contact The contact of the item owner
1424          *
1425          * @return array the item record
1426          * @throws \Exception
1427          */
1428         private static function parentItem($uid, $guid, $author, array $contact)
1429         {
1430                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1431                         'author-name', 'author-link', 'author-avatar',
1432                         'owner-name', 'owner-link', 'owner-avatar'];
1433                 $condition = ['uid' => $uid, 'guid' => $guid];
1434                 $item = Item::selectFirst($fields, $condition);
1435
1436                 if (!DBA::isResult($item)) {
1437                         $person = self::personByHandle($author);
1438                         $result = self::storeByGuid($guid, $person["url"], $uid);
1439
1440                         // We don't have an url for items that arrived at the public dispatcher
1441                         if (!$result && !empty($contact["url"])) {
1442                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1443                         }
1444
1445                         if ($result) {
1446                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1447
1448                                 $item = Item::selectFirst($fields, $condition);
1449                         }
1450                 }
1451
1452                 if (!DBA::isResult($item)) {
1453                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1454                         return false;
1455                 } else {
1456                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1457                         return $item;
1458                 }
1459         }
1460
1461         /**
1462          * @brief returns contact details
1463          *
1464          * @param array $def_contact The default contact if the person isn't found
1465          * @param array $person      The record of the person
1466          * @param int   $uid         The user id
1467          *
1468          * @return array
1469          *      'cid' => contact id
1470          *      'network' => network type
1471          * @throws \Exception
1472          */
1473         private static function authorContactByUrl($def_contact, $person, $uid)
1474         {
1475                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1476                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1477                 if (DBA::isResult($contact)) {
1478                         $cid = $contact["id"];
1479                         $network = $contact["network"];
1480                 } else {
1481                         $cid = $def_contact["id"];
1482                         $network = Protocol::DIASPORA;
1483                 }
1484
1485                 return ["cid" => $cid, "network" => $network];
1486         }
1487
1488         /**
1489          * @brief Is the profile a hubzilla profile?
1490          *
1491          * @param string $url The profile link
1492          *
1493          * @return bool is it a hubzilla server?
1494          */
1495         public static function isRedmatrix($url)
1496         {
1497                 return(strstr($url, "/channel/"));
1498         }
1499
1500         /**
1501          * @brief Generate a post link with a given handle and message guid
1502          *
1503          * @param string $addr        The user handle
1504          * @param string $guid        message guid
1505          * @param string $parent_guid optional parent guid
1506          *
1507          * @return string the post link
1508          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1509          * @throws \ImagickException
1510          */
1511         private static function plink($addr, $guid, $parent_guid = '')
1512         {
1513                 $contact = Contact::getDetailsByAddr($addr);
1514
1515                 // Fallback
1516                 if (!$contact) {
1517                         if ($parent_guid != '') {
1518                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1519                         } else {
1520                                 return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1521                         }
1522                 }
1523
1524                 if ($contact["network"] == Protocol::DFRN) {
1525                         return str_replace("/profile/" . $contact["nick"] . "/", "/display/" . $guid, $contact["url"] . "/");
1526                 }
1527
1528                 if (self::isRedmatrix($contact["url"])) {
1529                         return $contact["url"] . "/?f=&mid=" . $guid;
1530                 }
1531
1532                 if ($parent_guid != '') {
1533                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $parent_guid . "#" . $guid;
1534                 } else {
1535                         return "https://" . substr($addr, strpos($addr, "@") + 1) . "/posts/" . $guid;
1536                 }
1537         }
1538
1539         /**
1540          * @brief Receives account migration
1541          *
1542          * @param array  $importer Array of the importer user
1543          * @param object $data     The message object
1544          *
1545          * @return bool Success
1546          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1547          * @throws \ImagickException
1548          */
1549         private static function receiveAccountMigration(array $importer, $data)
1550         {
1551                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1552                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1553                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1554
1555                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1556                 if (!$contact) {
1557                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1558                         return false;
1559                 }
1560
1561                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1562
1563                 // Check signature
1564                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1565                 $key = self::key($old_handle);
1566                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1567                         Logger::log('No valid signature for migration.');
1568                         return false;
1569                 }
1570
1571                 // Update the profile
1572                 self::receiveProfile($importer, $data->profile);
1573
1574                 // change the technical stuff in contact and gcontact
1575                 $data = Probe::uri($new_handle);
1576                 if ($data['network'] == Protocol::PHANTOM) {
1577                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1578                         return false;
1579                 }
1580
1581                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1582                                 'name' => $data['name'], 'nick' => $data['nick'],
1583                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1584                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1585                                 'network' => $data['network']];
1586
1587                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1588
1589                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1590                                 'name' => $data['name'], 'nick' => $data['nick'],
1591                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1592                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1593                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1594
1595                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1596
1597                 Logger::log('Contacts are updated.');
1598
1599                 return true;
1600         }
1601
1602         /**
1603          * @brief Processes an account deletion
1604          *
1605          * @param object $data The message object
1606          *
1607          * @return bool Success
1608          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1609          */
1610         private static function receiveAccountDeletion($data)
1611         {
1612                 $author = Strings::escapeTags(XML::unescape($data->author));
1613
1614                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1615                 while ($contact = DBA::fetch($contacts)) {
1616                         Contact::remove($contact["id"]);
1617                 }
1618
1619                 DBA::delete('gcontact', ['addr' => $author]);
1620
1621                 Logger::log('Removed contacts for ' . $author);
1622
1623                 return true;
1624         }
1625
1626         /**
1627          * @brief Fetch the uri from our database if we already have this item (maybe from ourselves)
1628          *
1629          * @param string  $author    Author handle
1630          * @param string  $guid      Message guid
1631          * @param boolean $onlyfound Only return uri when found in the database
1632          *
1633          * @return string The constructed uri or the one from our database
1634          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1635          * @throws \ImagickException
1636          */
1637         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1638         {
1639                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1640                 if (DBA::isResult($item)) {
1641                         return $item["uri"];
1642                 } elseif (!$onlyfound) {
1643                         $person = self::personByHandle($author);
1644
1645                         $parts = parse_url($person['url']);
1646                         unset($parts['path']);
1647                         $host_url = Network::unparseURL($parts);
1648
1649                         return $host_url . '/objects/' . $guid;
1650                 }
1651
1652                 return "";
1653         }
1654
1655         /**
1656          * @brief Fetch the guid from our database with a given uri
1657          *
1658          * @param string $uri Message uri
1659          * @param string $uid Author handle
1660          *
1661          * @return string The post guid
1662          * @throws \Exception
1663          */
1664         private static function getGuidFromUri($uri, $uid)
1665         {
1666                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1667                 if (DBA::isResult($item)) {
1668                         return $item["guid"];
1669                 } else {
1670                         return false;
1671                 }
1672         }
1673
1674         /**
1675          * @brief Find the best importer for a comment, like, ...
1676          *
1677          * @param string $guid The guid of the item
1678          *
1679          * @return array|boolean the origin owner of that post - or false
1680          * @throws \Exception
1681          */
1682         private static function importerForGuid($guid)
1683         {
1684                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1685                 if (DBA::isResult($item)) {
1686                         Logger::log("Found user ".$item['uid']." as owner of item ".$guid, Logger::DEBUG);
1687                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1688                         if (DBA::isResult($contact)) {
1689                                 return $contact;
1690                         }
1691                 }
1692                 return false;
1693         }
1694
1695         /**
1696          * @brief Processes an incoming comment
1697          *
1698          * @param array  $importer Array of the importer user
1699          * @param string $sender   The sender of the message
1700          * @param object $data     The message object
1701          * @param string $xml      The original XML of the message
1702          *
1703          * @return int The message id of the generated comment or "false" if there was an error
1704          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1705          * @throws \ImagickException
1706          */
1707         private static function receiveComment(array $importer, $sender, $data, $xml)
1708         {
1709                 $author = Strings::escapeTags(XML::unescape($data->author));
1710                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1711                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1712                 $text = XML::unescape($data->text);
1713
1714                 if (isset($data->created_at)) {
1715                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1716                 } else {
1717                         $created_at = DateTimeFormat::utcNow();
1718                 }
1719
1720                 if (isset($data->thread_parent_guid)) {
1721                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1722                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1723                 } else {
1724                         $thr_uri = "";
1725                 }
1726
1727                 $contact = self::allowedContactByHandle($importer, $sender, true);
1728                 if (!$contact) {
1729                         return false;
1730                 }
1731
1732                 $message_id = self::messageExists($importer["uid"], $guid);
1733                 if ($message_id) {
1734                         return true;
1735                 }
1736
1737                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1738                 if (!$parent_item) {
1739                         return false;
1740                 }
1741
1742                 $person = self::personByHandle($author);
1743                 if (!is_array($person)) {
1744                         Logger::log("unable to find author details");
1745                         return false;
1746                 }
1747
1748                 // Fetch the contact id - if we know this contact
1749                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1750
1751                 $datarray = [];
1752
1753                 $datarray["uid"] = $importer["uid"];
1754                 $datarray["contact-id"] = $author_contact["cid"];
1755                 $datarray["network"]  = $author_contact["network"];
1756
1757                 $datarray["author-link"] = $person["url"];
1758                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1759
1760                 $datarray["owner-link"] = $contact["url"];
1761                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1762
1763                 $datarray["guid"] = $guid;
1764                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1765
1766                 $datarray["verb"] = ACTIVITY_POST;
1767                 $datarray["gravity"] = GRAVITY_COMMENT;
1768
1769                 if ($thr_uri != "") {
1770                         $datarray["parent-uri"] = $thr_uri;
1771                 } else {
1772                         $datarray["parent-uri"] = $parent_item["uri"];
1773                 }
1774
1775                 $datarray["object-type"] = ACTIVITY_OBJ_COMMENT;
1776
1777                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1778                 $datarray["source"] = $xml;
1779
1780                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1781
1782                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1783
1784                 $body = Markdown::toBBCode($text);
1785
1786                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1787
1788                 self::fetchGuid($datarray);
1789
1790                 // If we are the origin of the parent we store the original data.
1791                 // We notify our followers during the item storage.
1792                 if ($parent_item["origin"]) {
1793                         $datarray['diaspora_signed_text'] = json_encode($data);
1794                 }
1795
1796                 $message_id = Item::insert($datarray);
1797
1798                 if ($message_id <= 0) {
1799                         return false;
1800                 }
1801
1802                 if ($message_id) {
1803                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1804                         if ($datarray['uid'] == 0) {
1805                                 Item::distribute($message_id, json_encode($data));
1806                         }
1807                 }
1808
1809                 return true;
1810         }
1811
1812         /**
1813          * @brief processes and stores private messages
1814          *
1815          * @param array  $importer     Array of the importer user
1816          * @param array  $contact      The contact of the message
1817          * @param object $data         The message object
1818          * @param array  $msg          Array of the processed message, author handle and key
1819          * @param object $mesg         The private message
1820          * @param array  $conversation The conversation record to which this message belongs
1821          *
1822          * @return bool "true" if it was successful
1823          * @throws \Exception
1824          */
1825         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1826         {
1827                 $author = Strings::escapeTags(XML::unescape($data->author));
1828                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1829                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1830
1831                 // "diaspora_handle" is the element name from the old version
1832                 // "author" is the element name from the new version
1833                 if ($mesg->author) {
1834                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1835                 } elseif ($mesg->diaspora_handle) {
1836                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1837                 } else {
1838                         return false;
1839                 }
1840
1841                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1842                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1843                 $msg_text = XML::unescape($mesg->text);
1844                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1845
1846                 if ($msg_conversation_guid != $guid) {
1847                         Logger::log("message conversation guid does not belong to the current conversation.");
1848                         return false;
1849                 }
1850
1851                 $body = Markdown::toBBCode($msg_text);
1852                 $message_uri = $msg_author.":".$msg_guid;
1853
1854                 $person = self::personByHandle($msg_author);
1855
1856                 return Mail::insert([
1857                         'uid'        => $importer['uid'],
1858                         'guid'       => $msg_guid,
1859                         'convid'     => $conversation['id'],
1860                         'from-name'  => $person['name'],
1861                         'from-photo' => $person['photo'],
1862                         'from-url'   => $person['url'],
1863                         'contact-id' => $contact['id'],
1864                         'title'      => $subject,
1865                         'body'       => $body,
1866                         'uri'        => $message_uri,
1867                         'parent-uri' => $author . ':' . $guid,
1868                         'created'    => $msg_created_at
1869                 ]);
1870         }
1871
1872         /**
1873          * @brief Processes new private messages (answers to private messages are processed elsewhere)
1874          *
1875          * @param array  $importer Array of the importer user
1876          * @param array  $msg      Array of the processed message, author handle and key
1877          * @param object $data     The message object
1878          *
1879          * @return bool Success
1880          * @throws \Exception
1881          */
1882         private static function receiveConversation(array $importer, $msg, $data)
1883         {
1884                 $author = Strings::escapeTags(XML::unescape($data->author));
1885                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1886                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1887                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1888                 $participants = Strings::escapeTags(XML::unescape($data->participants));
1889
1890                 $messages = $data->message;
1891
1892                 if (!count($messages)) {
1893                         Logger::log("empty conversation");
1894                         return false;
1895                 }
1896
1897                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
1898                 if (!$contact) {
1899                         return false;
1900                 }
1901
1902                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1903                 if (!DBA::isResult($conversation)) {
1904                         $r = q(
1905                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
1906                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
1907                                 intval($importer["uid"]),
1908                                 DBA::escape($guid),
1909                                 DBA::escape($author),
1910                                 DBA::escape($created_at),
1911                                 DBA::escape(DateTimeFormat::utcNow()),
1912                                 DBA::escape($subject),
1913                                 DBA::escape($participants)
1914                         );
1915                         if ($r) {
1916                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
1917                         }
1918                 }
1919                 if (!$conversation) {
1920                         Logger::log("unable to create conversation.");
1921                         return false;
1922                 }
1923
1924                 foreach ($messages as $mesg) {
1925                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
1926                 }
1927
1928                 return true;
1929         }
1930
1931         /**
1932          * @brief Processes "like" messages
1933          *
1934          * @param array  $importer Array of the importer user
1935          * @param string $sender   The sender of the message
1936          * @param object $data     The message object
1937          *
1938          * @return int The message id of the generated like or "false" if there was an error
1939          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1940          * @throws \ImagickException
1941          */
1942         private static function receiveLike(array $importer, $sender, $data)
1943         {
1944                 $author = Strings::escapeTags(XML::unescape($data->author));
1945                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1946                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1947                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
1948                 $positive = Strings::escapeTags(XML::unescape($data->positive));
1949
1950                 // likes on comments aren't supported by Diaspora - only on posts
1951                 // But maybe this will be supported in the future, so we will accept it.
1952                 if (!in_array($parent_type, ["Post", "Comment"])) {
1953                         return false;
1954                 }
1955
1956                 $contact = self::allowedContactByHandle($importer, $sender, true);
1957                 if (!$contact) {
1958                         return false;
1959                 }
1960
1961                 $message_id = self::messageExists($importer["uid"], $guid);
1962                 if ($message_id) {
1963                         return true;
1964                 }
1965
1966                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1967                 if (!$parent_item) {
1968                         return false;
1969                 }
1970
1971                 $person = self::personByHandle($author);
1972                 if (!is_array($person)) {
1973                         Logger::log("unable to find author details");
1974                         return false;
1975                 }
1976
1977                 // Fetch the contact id - if we know this contact
1978                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1979
1980                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
1981                 // We would accept this anyhow.
1982                 if ($positive == "true") {
1983                         $verb = ACTIVITY_LIKE;
1984                 } else {
1985                         $verb = ACTIVITY_DISLIKE;
1986                 }
1987
1988                 $datarray = [];
1989
1990                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1991
1992                 $datarray["uid"] = $importer["uid"];
1993                 $datarray["contact-id"] = $author_contact["cid"];
1994                 $datarray["network"]  = $author_contact["network"];
1995
1996                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
1997                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1998
1999                 $datarray["guid"] = $guid;
2000                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2001
2002                 $datarray["verb"] = $verb;
2003                 $datarray["gravity"] = GRAVITY_ACTIVITY;
2004                 $datarray["parent-uri"] = $parent_item["uri"];
2005
2006                 $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2007
2008                 $datarray["body"] = $verb;
2009
2010                 // Diaspora doesn't provide a date for likes
2011                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
2012
2013                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2014                 if ($parent_item["id"] != $parent_item["parent"]) {
2015                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item["parent"]]);
2016                         $origin = $toplevel["origin"];
2017                 } else {
2018                         $origin = $parent_item["origin"];
2019                 }
2020
2021                 // If we are the origin of the parent we store the original data.
2022                 // We notify our followers during the item storage.
2023                 if ($origin) {
2024                         $datarray['diaspora_signed_text'] = json_encode($data);
2025                 }
2026
2027                 $message_id = Item::insert($datarray);
2028
2029                 if ($message_id <= 0) {
2030                         return false;
2031                 }
2032
2033                 if ($message_id) {
2034                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2035                         if ($datarray['uid'] == 0) {
2036                                 Item::distribute($message_id, json_encode($data));
2037                         }
2038                 }
2039
2040                 return true;
2041         }
2042
2043         /**
2044          * @brief Processes private messages
2045          *
2046          * @param array  $importer Array of the importer user
2047          * @param object $data     The message object
2048          *
2049          * @return bool Success?
2050          * @throws \Exception
2051          */
2052         private static function receiveMessage(array $importer, $data)
2053         {
2054                 $author = Strings::escapeTags(XML::unescape($data->author));
2055                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2056                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
2057                 $text = XML::unescape($data->text);
2058                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2059
2060                 $contact = self::allowedContactByHandle($importer, $author, true);
2061                 if (!$contact) {
2062                         return false;
2063                 }
2064
2065                 $conversation = null;
2066
2067                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
2068                 $conversation = DBA::selectFirst('conv', [], $condition);
2069
2070                 if (!DBA::isResult($conversation)) {
2071                         Logger::log("conversation not available.");
2072                         return false;
2073                 }
2074
2075                 $message_uri = $author.":".$guid;
2076
2077                 $person = self::personByHandle($author);
2078                 if (!$person) {
2079                         Logger::log("unable to find author details");
2080                         return false;
2081                 }
2082
2083                 $body = Markdown::toBBCode($text);
2084
2085                 $body = self::replacePeopleGuid($body, $person["url"]);
2086
2087                 return Mail::insert([
2088                         'uid'        => $importer['uid'],
2089                         'guid'       => $guid,
2090                         'convid'     => $conversation['id'],
2091                         'from-name'  => $person['name'],
2092                         'from-photo' => $person['photo'],
2093                         'from-url'   => $person['url'],
2094                         'contact-id' => $contact['id'],
2095                         'title'      => $conversation['subject'],
2096                         'body'       => $body,
2097                         'reply'      => 1,
2098                         'uri'        => $message_uri,
2099                         'parent-uri' => $author.":".$conversation['guid'],
2100                         'created'    => $created_at
2101                 ]);
2102         }
2103
2104         /**
2105          * @brief Processes participations - unsupported by now
2106          *
2107          * @param array  $importer Array of the importer user
2108          * @param object $data     The message object
2109          *
2110          * @return bool always true
2111          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2112          * @throws \ImagickException
2113          */
2114         private static function receiveParticipation(array $importer, $data)
2115         {
2116                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2117                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2118
2119                 $contact_id = Contact::getIdForURL($author);
2120                 if (!$contact_id) {
2121                         Logger::log('Contact not found: '.$author);
2122                         return false;
2123                 }
2124
2125                 $person = self::personByHandle($author);
2126                 if (!is_array($person)) {
2127                         Logger::log("Person not found: ".$author);
2128                         return false;
2129                 }
2130
2131                 $item = Item::selectFirst(['id'], ['guid' => $parent_guid, 'origin' => true, 'private' => false]);
2132                 if (!DBA::isResult($item)) {
2133                         Logger::log('Item not found, no origin or private: '.$parent_guid);
2134                         return false;
2135                 }
2136
2137                 $author_parts = explode('@', $author);
2138                 if (isset($author_parts[1])) {
2139                         $server = $author_parts[1];
2140                 } else {
2141                         // Should never happen
2142                         $server = $author;
2143                 }
2144
2145                 Logger::log('Received participation for ID: '.$item['id'].' - Contact: '.$contact_id.' - Server: '.$server, Logger::DEBUG);
2146
2147                 if (!DBA::exists('participation', ['iid' => $item['id'], 'server' => $server])) {
2148                         DBA::insert('participation', ['iid' => $item['id'], 'cid' => $contact_id, 'fid' => $person['id'], 'server' => $server]);
2149                 }
2150
2151                 // Send all existing comments and likes to the requesting server
2152                 $comments = Item::select(['id', 'parent', 'verb', 'self'], ['parent' => $item['id']]);
2153                 while ($comment = Item::fetch($comments)) {
2154                         if ($comment['id'] == $comment['parent']) {
2155                                 continue;
2156                         }
2157
2158                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $contact_id]);
2159                         Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $contact_id);
2160                 }
2161                 DBA::close($comments);
2162
2163                 return true;
2164         }
2165
2166         /**
2167          * @brief Processes photos - unneeded
2168          *
2169          * @param array  $importer Array of the importer user
2170          * @param object $data     The message object
2171          *
2172          * @return bool always true
2173          */
2174         private static function receivePhoto(array $importer, $data)
2175         {
2176                 // There doesn't seem to be a reason for this function,
2177                 // since the photo data is transmitted in the status message as well
2178                 return true;
2179         }
2180
2181         /**
2182          * @brief Processes poll participations - unssupported
2183          *
2184          * @param array  $importer Array of the importer user
2185          * @param object $data     The message object
2186          *
2187          * @return bool always true
2188          */
2189         private static function receivePollParticipation(array $importer, $data)
2190         {
2191                 // We don't support polls by now
2192                 return true;
2193         }
2194
2195         /**
2196          * @brief Processes incoming profile updates
2197          *
2198          * @param array  $importer Array of the importer user
2199          * @param object $data     The message object
2200          *
2201          * @return bool Success
2202          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2203          * @throws \ImagickException
2204          */
2205         private static function receiveProfile(array $importer, $data)
2206         {
2207                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2208
2209                 $contact = self::contactByHandle($importer["uid"], $author);
2210                 if (!$contact) {
2211                         return false;
2212                 }
2213
2214                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2215                 $image_url = XML::unescape($data->image_url);
2216                 $birthday = XML::unescape($data->birthday);
2217                 $gender = XML::unescape($data->gender);
2218                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2219                 $location = Markdown::toBBCode(XML::unescape($data->location));
2220                 $searchable = (XML::unescape($data->searchable) == "true");
2221                 $nsfw = (XML::unescape($data->nsfw) == "true");
2222                 $tags = XML::unescape($data->tag_string);
2223
2224                 $tags = explode("#", $tags);
2225
2226                 $keywords = [];
2227                 foreach ($tags as $tag) {
2228                         $tag = trim(strtolower($tag));
2229                         if ($tag != "") {
2230                                 $keywords[] = $tag;
2231                         }
2232                 }
2233
2234                 $keywords = implode(", ", $keywords);
2235
2236                 $handle_parts = explode("@", $author);
2237                 $nick = $handle_parts[0];
2238
2239                 if ($name === "") {
2240                         $name = $handle_parts[0];
2241                 }
2242
2243                 if (preg_match("|^https?://|", $image_url) === 0) {
2244                         $image_url = "http://".$handle_parts[1].$image_url;
2245                 }
2246
2247                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2248
2249                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2250
2251                 $birthday = str_replace("1000", "1901", $birthday);
2252
2253                 if ($birthday != "") {
2254                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2255                 }
2256
2257                 // this is to prevent multiple birthday notifications in a single year
2258                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2259
2260                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2261                         $birthday = $contact["bd"];
2262                 }
2263
2264                 $fields = ['name' => $name, 'location' => $location,
2265                         'name-date' => DateTimeFormat::utcNow(),
2266                         'about' => $about, 'gender' => $gender,
2267                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2268                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2269
2270                 if (!empty($birthday)) {
2271                         $fields['bd'] = $birthday;
2272                 }
2273
2274                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2275
2276                 // @todo Update the public contact, then update the gcontact from that
2277
2278                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2279                                         "photo" => $image_url, "name" => $name, "location" => $location,
2280                                         "about" => $about, "birthday" => $birthday, "gender" => $gender,
2281                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2282                                         "hide" => !$searchable, "nsfw" => $nsfw];
2283
2284                 $gcid = GContact::update($gcontact);
2285
2286                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2287
2288                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2289
2290                 return true;
2291         }
2292
2293         /**
2294          * @brief Processes incoming friend requests
2295          *
2296          * @param array $importer Array of the importer user
2297          * @param array $contact  The contact that send the request
2298          * @return void
2299          * @throws \Exception
2300          */
2301         private static function receiveRequestMakeFriend(array $importer, array $contact)
2302         {
2303                 if ($contact["rel"] == Contact::SHARING) {
2304                         DBA::update(
2305                                 'contact',
2306                                 ['rel' => Contact::FRIEND, 'writable' => true],
2307                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2308                         );
2309                 }
2310         }
2311
2312         /**
2313          * @brief Processes incoming sharing notification
2314          *
2315          * @param array  $importer Array of the importer user
2316          * @param object $data     The message object
2317          *
2318          * @return bool Success
2319          * @throws \Exception
2320          */
2321         private static function receiveContactRequest(array $importer, $data)
2322         {
2323                 $author = XML::unescape($data->author);
2324                 $recipient = XML::unescape($data->recipient);
2325
2326                 if (!$author || !$recipient) {
2327                         return false;
2328                 }
2329
2330                 // the current protocol version doesn't know these fields
2331                 // That means that we will assume their existance
2332                 if (isset($data->following)) {
2333                         $following = (XML::unescape($data->following) == "true");
2334                 } else {
2335                         $following = true;
2336                 }
2337
2338                 if (isset($data->sharing)) {
2339                         $sharing = (XML::unescape($data->sharing) == "true");
2340                 } else {
2341                         $sharing = true;
2342                 }
2343
2344                 $contact = self::contactByHandle($importer["uid"], $author);
2345
2346                 // perhaps we were already sharing with this person. Now they're sharing with us.
2347                 // That makes us friends.
2348                 if ($contact) {
2349                         if ($following) {
2350                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2351                                 self::receiveRequestMakeFriend($importer, $contact);
2352
2353                                 // refetch the contact array
2354                                 $contact = self::contactByHandle($importer["uid"], $author);
2355
2356                                 // If we are now friends, we are sending a share message.
2357                                 // Normally we needn't to do so, but the first message could have been vanished.
2358                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2359                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2360                                         if (DBA::isResult($user)) {
2361                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2362                                                 self::sendShare($user, $contact);
2363                                         }
2364                                 }
2365                                 return true;
2366                         } else {
2367                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2368                                 Contact::removeFollower($importer, $contact);
2369                                 return true;
2370                         }
2371                 }
2372
2373                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2374                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2375                         return false;
2376                 } elseif (!$following && !$sharing) {
2377                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2378                         return false;
2379                 } elseif (!$following && $sharing) {
2380                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2381                 } elseif ($following && $sharing) {
2382                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2383                 } elseif ($following && !$sharing) {
2384                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2385                 }
2386
2387                 $ret = self::personByHandle($author);
2388
2389                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2390                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2391                         return false;
2392                 }
2393
2394                 $batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
2395
2396                 q(
2397                         "INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
2398                         VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
2399                         intval($importer["uid"]),
2400                         DBA::escape($ret["network"]),
2401                         DBA::escape($ret["addr"]),
2402                         DateTimeFormat::utcNow(),
2403                         DBA::escape($ret["url"]),
2404                         DBA::escape(Strings::normaliseLink($ret["url"])),
2405                         DBA::escape($batch),
2406                         DBA::escape($ret["name"]),
2407                         DBA::escape($ret["nick"]),
2408                         DBA::escape($ret["photo"]),
2409                         DBA::escape($ret["pubkey"]),
2410                         DBA::escape($ret["notify"]),
2411                         DBA::escape($ret["poll"]),
2412                         1,
2413                         2
2414                 );
2415
2416                 // find the contact record we just created
2417
2418                 $contact_record = self::contactByHandle($importer["uid"], $author);
2419
2420                 if (!$contact_record) {
2421                         Logger::log("unable to locate newly created contact record.");
2422                         return;
2423                 }
2424
2425                 Logger::log("Author ".$author." was added as contact number ".$contact_record["id"].".", Logger::DEBUG);
2426
2427                 Group::addMember(User::getDefaultGroup($importer['uid'], $ret["network"]), $contact_record['id']);
2428
2429                 Contact::updateAvatar($ret["photo"], $importer['uid'], $contact_record["id"], true);
2430
2431                 if (in_array($importer["page-flags"], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP])) {
2432                         Logger::log("Sending intra message for author ".$author.".", Logger::DEBUG);
2433
2434                         $hash = Strings::getRandomHex().(string)time();   // Generate a confirm_key
2435
2436                         q(
2437                                 "INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
2438                                 VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
2439                                 intval($importer["uid"]),
2440                                 intval($contact_record["id"]),
2441                                 0,
2442                                 0,
2443                                 DBA::escape(L10n::t("Sharing notification from Diaspora network")),
2444                                 DBA::escape($hash),
2445                                 DBA::escape(DateTimeFormat::utcNow())
2446                         );
2447                 } else {
2448                         // automatic friend approval
2449
2450                         Logger::log("Does an automatic friend approval for author ".$author.".", Logger::DEBUG);
2451
2452                         Contact::updateAvatar($contact_record["photo"], $importer["uid"], $contact_record["id"]);
2453
2454                         /*
2455                          * technically they are sharing with us (Contact::SHARING),
2456                          * but if our page-type is Profile::PAGE_COMMUNITY or Profile::PAGE_SOAPBOX
2457                          * we are going to change the relationship and make them a follower.
2458                          */
2459                         if (($importer["page-flags"] == User::PAGE_FLAGS_FREELOVE) && $sharing && $following) {
2460                                 $new_relation = Contact::FRIEND;
2461                         } elseif (($importer["page-flags"] == User::PAGE_FLAGS_FREELOVE) && $sharing) {
2462                                 $new_relation = Contact::SHARING;
2463                         } else {
2464                                 $new_relation = Contact::FOLLOWER;
2465                         }
2466
2467                         q(
2468                                 "UPDATE `contact` SET `rel` = %d,
2469                                 `name-date` = '%s',
2470                                 `uri-date` = '%s',
2471                                 `blocked` = 0,
2472                                 `pending` = 0,
2473                                 `writable` = 1
2474                                 WHERE `id` = %d
2475                                 ",
2476                                 intval($new_relation),
2477                                 DBA::escape(DateTimeFormat::utcNow()),
2478                                 DBA::escape(DateTimeFormat::utcNow()),
2479                                 intval($contact_record["id"])
2480                         );
2481
2482                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2483                         if (DBA::isResult($user)) {
2484                                 Logger::log("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2485                                 self::sendShare($user, $contact_record);
2486
2487                                 // Send the profile data, maybe it weren't transmitted before
2488                                 self::sendProfile($importer["uid"], [$contact_record]);
2489                         }
2490                 }
2491
2492                 return true;
2493         }
2494
2495         /**
2496          * @brief Fetches a message with a given guid
2497          *
2498          * @param string $guid        message guid
2499          * @param string $orig_author handle of the original post
2500          * @return array The fetched item
2501          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2502          * @throws \ImagickException
2503          */
2504         public static function originalItem($guid, $orig_author)
2505         {
2506                 if (empty($guid)) {
2507                         Logger::log('Empty guid. Quitting.');
2508                         return false;
2509                 }
2510
2511                 // Do we already have this item?
2512                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2513                         'author-name', 'author-link', 'author-avatar'];
2514                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2515                 $item = Item::selectFirst($fields, $condition);
2516
2517                 if (DBA::isResult($item)) {
2518                         Logger::log("reshared message ".$guid." already exists on system.");
2519
2520                         // Maybe it is already a reshared item?
2521                         // Then refetch the content, if it is a reshare from a reshare.
2522                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2523                         if (self::isReshare($item["body"], true)) {
2524                                 $item = [];
2525                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2526                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2527
2528                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2529
2530                                 // Add OEmbed and other information to the body
2531                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2532
2533                                 return $item;
2534                         } else {
2535                                 return $item;
2536                         }
2537                 }
2538
2539                 if (!DBA::isResult($item)) {
2540                         if (empty($orig_author)) {
2541                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2542                                 return false;
2543                         }
2544
2545                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2546                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2547                         $stored = self::storeByGuid($guid, $server);
2548
2549                         if (!$stored) {
2550                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2551                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2552                                 $stored = self::storeByGuid($guid, $server);
2553                         }
2554
2555                         if ($stored) {
2556                                 $fields = ['body', 'tag', 'app', 'created', 'object-type', 'uri', 'guid',
2557                                         'author-name', 'author-link', 'author-avatar'];
2558                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => false];
2559                                 $item = Item::selectFirst($fields, $condition);
2560
2561                                 if (DBA::isResult($item)) {
2562                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2563                                         if (self::isReshare($item["body"], false)) {
2564                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2565                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2566                                         }
2567
2568                                         return $item;
2569                                 }
2570                         }
2571                 }
2572                 return false;
2573         }
2574
2575         /**
2576          * @brief Stores a reshare activity
2577          *
2578          * @param array   $item              Array of reshare post
2579          * @param integer $parent_message_id Id of the parent post
2580          * @param string  $guid              GUID string of reshare action
2581          * @param string  $author            Author handle
2582          */
2583         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2584         {
2585                 $parent = Item::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2586
2587                 $datarray = [];
2588
2589                 $datarray['uid'] = $item['uid'];
2590                 $datarray['contact-id'] = $item['contact-id'];
2591                 $datarray['network'] = $item['network'];
2592
2593                 $datarray['author-link'] = $item['author-link'];
2594                 $datarray['author-id'] = $item['author-id'];
2595
2596                 $datarray['owner-link'] = $datarray['author-link'];
2597                 $datarray['owner-id'] = $datarray['author-id'];
2598
2599                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2600                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2601                 $datarray['parent-uri'] = $parent['uri'];
2602
2603                 $datarray['verb'] = $datarray['body'] = ACTIVITY2_ANNOUNCE;
2604                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2605                 $datarray['object-type'] = ACTIVITY_OBJ_NOTE;
2606
2607                 $datarray['protocol'] = $item['protocol'];
2608
2609                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2610                 $datarray['private'] = $item['private'];
2611                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2612
2613                 $message_id = Item::insert($datarray);
2614
2615                 if ($message_id) {
2616                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2617                         if ($datarray['uid'] == 0) {
2618                                 Item::distribute($message_id);
2619                         }
2620                 }
2621         }
2622
2623         /**
2624          * @brief Processes a reshare message
2625          *
2626          * @param array  $importer Array of the importer user
2627          * @param object $data     The message object
2628          * @param string $xml      The original XML of the message
2629          *
2630          * @return int the message id
2631          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2632          * @throws \ImagickException
2633          */
2634         private static function receiveReshare(array $importer, $data, $xml)
2635         {
2636                 $author = Strings::escapeTags(XML::unescape($data->author));
2637                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2638                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2639                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2640                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2641                 /// @todo handle unprocessed property "provider_display_name"
2642                 $public = Strings::escapeTags(XML::unescape($data->public));
2643
2644                 $contact = self::allowedContactByHandle($importer, $author, false);
2645                 if (!$contact) {
2646                         return false;
2647                 }
2648
2649                 $message_id = self::messageExists($importer["uid"], $guid);
2650                 if ($message_id) {
2651                         return true;
2652                 }
2653
2654                 $original_item = self::originalItem($root_guid, $root_author);
2655                 if (!$original_item) {
2656                         return false;
2657                 }
2658
2659                 $orig_url = System::baseUrl()."/display/".$original_item["guid"];
2660
2661                 $datarray = [];
2662
2663                 $datarray["uid"] = $importer["uid"];
2664                 $datarray["contact-id"] = $contact["id"];
2665                 $datarray["network"]  = Protocol::DIASPORA;
2666
2667                 $datarray["author-link"] = $contact["url"];
2668                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2669
2670                 $datarray["owner-link"] = $datarray["author-link"];
2671                 $datarray["owner-id"] = $datarray["author-id"];
2672
2673                 $datarray["guid"] = $guid;
2674                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2675
2676                 $datarray["verb"] = ACTIVITY_POST;
2677                 $datarray["gravity"] = GRAVITY_PARENT;
2678
2679                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2680                 $datarray["source"] = $xml;
2681
2682                 $prefix = share_header(
2683                         $original_item["author-name"],
2684                         $original_item["author-link"],
2685                         $original_item["author-avatar"],
2686                         $original_item["guid"],
2687                         $original_item["created"],
2688                         $orig_url
2689                 );
2690                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2691
2692                 $datarray["tag"] = $original_item["tag"];
2693                 $datarray["app"]  = $original_item["app"];
2694
2695                 $datarray["plink"] = self::plink($author, $guid);
2696                 $datarray["private"] = (($public == "false") ? 1 : 0);
2697                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2698
2699                 $datarray["object-type"] = $original_item["object-type"];
2700
2701                 self::fetchGuid($datarray);
2702                 $message_id = Item::insert($datarray);
2703
2704                 self::sendParticipation($contact, $datarray);
2705
2706                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2707                 if ($root_message_id) {
2708                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2709                 }
2710
2711                 if ($message_id) {
2712                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2713                         if ($datarray['uid'] == 0) {
2714                                 Item::distribute($message_id);
2715                         }
2716                         return true;
2717                 } else {
2718                         return false;
2719                 }
2720         }
2721
2722         /**
2723          * @brief Processes retractions
2724          *
2725          * @param array  $importer Array of the importer user
2726          * @param array  $contact  The contact of the item owner
2727          * @param object $data     The message object
2728          *
2729          * @return bool success
2730          * @throws \Exception
2731          */
2732         private static function itemRetraction(array $importer, array $contact, $data)
2733         {
2734                 $author = Strings::escapeTags(XML::unescape($data->author));
2735                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2736                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2737
2738                 $person = self::personByHandle($author);
2739                 if (!is_array($person)) {
2740                         Logger::log("unable to find author detail for ".$author);
2741                         return false;
2742                 }
2743
2744                 if (empty($contact["url"])) {
2745                         $contact["url"] = $person["url"];
2746                 }
2747
2748                 // Fetch items that are about to be deleted
2749                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2750
2751                 // When we receive a public retraction, we delete every item that we find.
2752                 if ($importer['uid'] == 0) {
2753                         $condition = ['guid' => $target_guid, 'deleted' => false];
2754                 } else {
2755                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2756                 }
2757
2758                 $r = Item::select($fields, $condition);
2759                 if (!DBA::isResult($r)) {
2760                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2761                         return false;
2762                 }
2763
2764                 while ($item = Item::fetch($r)) {
2765                         if (strstr($item['file'], '[')) {
2766                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2767                                 continue;
2768                         }
2769
2770                         // Fetch the parent item
2771                         $parent = Item::selectFirst(['author-link'], ['id' => $item["parent"]]);
2772
2773                         // Only delete it if the parent author really fits
2774                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2775                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2776                                 continue;
2777                         }
2778
2779                         Item::delete(['id' => $item['id']]);
2780
2781                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item["parent"], Logger::DEBUG);
2782                 }
2783
2784                 return true;
2785         }
2786
2787         /**
2788          * @brief Receives retraction messages
2789          *
2790          * @param array  $importer Array of the importer user
2791          * @param string $sender   The sender of the message
2792          * @param object $data     The message object
2793          *
2794          * @return bool Success
2795          * @throws \Exception
2796          */
2797         private static function receiveRetraction(array $importer, $sender, $data)
2798         {
2799                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2800
2801                 $contact = self::contactByHandle($importer["uid"], $sender);
2802                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2803                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2804                         return false;
2805                 }
2806
2807                 if (!$contact) {
2808                         $contact = [];
2809                 }
2810
2811                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2812
2813                 switch ($target_type) {
2814                         case "Comment":
2815                         case "Like":
2816                         case "Post":
2817                         case "Reshare":
2818                         case "StatusMessage":
2819                                 return self::itemRetraction($importer, $contact, $data);
2820
2821                         case "PollParticipation":
2822                         case "Photo":
2823                                 // Currently unsupported
2824                                 break;
2825
2826                         default:
2827                                 Logger::log("Unknown target type ".$target_type);
2828                                 return false;
2829                 }
2830                 return true;
2831         }
2832
2833         /**
2834          * @brief Receives status messages
2835          *
2836          * @param array            $importer Array of the importer user
2837          * @param SimpleXMLElement $data     The message object
2838          * @param string           $xml      The original XML of the message
2839          *
2840          * @return int The message id of the newly created item
2841          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2842          * @throws \ImagickException
2843          */
2844         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2845         {
2846                 $author = Strings::escapeTags(XML::unescape($data->author));
2847                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2848                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2849                 $public = Strings::escapeTags(XML::unescape($data->public));
2850                 $text = XML::unescape($data->text);
2851                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2852
2853                 $contact = self::allowedContactByHandle($importer, $author, false);
2854                 if (!$contact) {
2855                         return false;
2856                 }
2857
2858                 $message_id = self::messageExists($importer["uid"], $guid);
2859                 if ($message_id) {
2860                         return true;
2861                 }
2862
2863                 $address = [];
2864                 if ($data->location) {
2865                         foreach ($data->location->children() as $fieldname => $data) {
2866                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2867                         }
2868                 }
2869
2870                 $body = Markdown::toBBCode($text);
2871
2872                 $datarray = [];
2873
2874                 // Attach embedded pictures to the body
2875                 if ($data->photo) {
2876                         foreach ($data->photo as $photo) {
2877                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
2878                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
2879                         }
2880
2881                         $datarray["object-type"] = ACTIVITY_OBJ_IMAGE;
2882                 } else {
2883                         $datarray["object-type"] = ACTIVITY_OBJ_NOTE;
2884
2885                         // Add OEmbed and other information to the body
2886                         if (!self::isRedmatrix($contact["url"])) {
2887                                 $body = add_page_info_to_body($body, false, true);
2888                         }
2889                 }
2890
2891                 /// @todo enable support for polls
2892                 //if ($data->poll) {
2893                 //      foreach ($data->poll AS $poll)
2894                 //              print_r($poll);
2895                 //      die("poll!\n");
2896                 //}
2897
2898                 /// @todo enable support for events
2899
2900                 $datarray["uid"] = $importer["uid"];
2901                 $datarray["contact-id"] = $contact["id"];
2902                 $datarray["network"] = Protocol::DIASPORA;
2903
2904                 $datarray["author-link"] = $contact["url"];
2905                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2906
2907                 $datarray["owner-link"] = $datarray["author-link"];
2908                 $datarray["owner-id"] = $datarray["author-id"];
2909
2910                 $datarray["guid"] = $guid;
2911                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2912
2913                 $datarray["verb"] = ACTIVITY_POST;
2914                 $datarray["gravity"] = GRAVITY_PARENT;
2915
2916                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2917                 $datarray["source"] = $xml;
2918
2919                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
2920
2921                 if ($provider_display_name != "") {
2922                         $datarray["app"] = $provider_display_name;
2923                 }
2924
2925                 $datarray["plink"] = self::plink($author, $guid);
2926                 $datarray["private"] = (($public == "false") ? 1 : 0);
2927                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2928
2929                 if (isset($address["address"])) {
2930                         $datarray["location"] = $address["address"];
2931                 }
2932
2933                 if (isset($address["lat"]) && isset($address["lng"])) {
2934                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
2935                 }
2936
2937                 self::fetchGuid($datarray);
2938                 $message_id = Item::insert($datarray);
2939
2940                 self::sendParticipation($contact, $datarray);
2941
2942                 if ($message_id) {
2943                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2944                         if ($datarray['uid'] == 0) {
2945                                 Item::distribute($message_id);
2946                         }
2947                         return true;
2948                 } else {
2949                         return false;
2950                 }
2951         }
2952
2953         /* ************************************************************************************** *
2954          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
2955          * ************************************************************************************** */
2956
2957         /**
2958          * @brief returnes the handle of a contact
2959          *
2960          * @param array $contact contact array
2961          *
2962          * @return string the handle in the format user@domain.tld
2963          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2964          */
2965         private static function myHandle(array $contact)
2966         {
2967                 if (!empty($contact["addr"])) {
2968                         return $contact["addr"];
2969                 }
2970
2971                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
2972                 // So - just in case - we build the the address here.
2973                 if ($contact["nickname"] != "") {
2974                         $nick = $contact["nickname"];
2975                 } else {
2976                         $nick = $contact["nick"];
2977                 }
2978
2979                 return $nick . "@" . substr(System::baseUrl(), strpos(System::baseUrl(), "://") + 3);
2980         }
2981
2982
2983         /**
2984          * @brief Creates the data for a private message in the new format
2985          *
2986          * @param string $msg     The message that is to be transmitted
2987          * @param array  $user    The record of the sender
2988          * @param array  $contact Target of the communication
2989          * @param string $prvkey  The private key of the sender
2990          * @param string $pubkey  The public key of the receiver
2991          *
2992          * @return string The encrypted data
2993          * @throws \Exception
2994          */
2995         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
2996         {
2997                 Logger::log("Message: ".$msg, Logger::DATA);
2998
2999                 // without a public key nothing will work
3000                 if (!$pubkey) {
3001                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
3002                         return false;
3003                 }
3004
3005                 $aes_key = openssl_random_pseudo_bytes(32);
3006                 $b_aes_key = base64_encode($aes_key);
3007                 $iv = openssl_random_pseudo_bytes(16);
3008                 $b_iv = base64_encode($iv);
3009
3010                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3011
3012                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3013
3014                 $encrypted_key_bundle = "";
3015                 openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey);
3016
3017                 $json_object = json_encode(
3018                         ["aes_key" => base64_encode($encrypted_key_bundle),
3019                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3020                 );
3021
3022                 return $json_object;
3023         }
3024
3025         /**
3026          * @brief Creates the envelope for the "fetch" endpoint and for the new format
3027          *
3028          * @param string $msg  The message that is to be transmitted
3029          * @param array  $user The record of the sender
3030          *
3031          * @return string The envelope
3032          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3033          */
3034         public static function buildMagicEnvelope($msg, array $user)
3035         {
3036                 $b64url_data = Strings::base64UrlEncode($msg);
3037                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3038
3039                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
3040                 $type = "application/xml";
3041                 $encoding = "base64url";
3042                 $alg = "RSA-SHA256";
3043                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
3044
3045                 // Fallback if the private key wasn't transmitted in the expected field
3046                 if ($user['uprvkey'] == "") {
3047                         $user['uprvkey'] = $user['prvkey'];
3048                 }
3049
3050                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3051                 $sig = Strings::base64UrlEncode($signature);
3052
3053                 $xmldata = ["me:env" => ["me:data" => $data,
3054                                                         "@attributes" => ["type" => $type],
3055                                                         "me:encoding" => $encoding,
3056                                                         "me:alg" => $alg,
3057                                                         "me:sig" => $sig,
3058                                                         "@attributes2" => ["key_id" => $key_id]]];
3059
3060                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3061
3062                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3063         }
3064
3065         /**
3066          * @brief Create the envelope for a message
3067          *
3068          * @param string $msg     The message that is to be transmitted
3069          * @param array  $user    The record of the sender
3070          * @param array  $contact Target of the communication
3071          * @param string $prvkey  The private key of the sender
3072          * @param string $pubkey  The public key of the receiver
3073          * @param bool   $public  Is the message public?
3074          *
3075          * @return string The message that will be transmitted to other servers
3076          * @throws \Exception
3077          */
3078         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3079         {
3080                 // The message is put into an envelope with the sender's signature
3081                 $envelope = self::buildMagicEnvelope($msg, $user);
3082
3083                 // Private messages are put into a second envelope, encrypted with the receivers public key
3084                 if (!$public) {
3085                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3086                 }
3087
3088                 return $envelope;
3089         }
3090
3091         /**
3092          * @brief Creates a signature for a message
3093          *
3094          * @param array $owner   the array of the owner of the message
3095          * @param array $message The message that is to be signed
3096          *
3097          * @return string The signature
3098          */
3099         private static function signature($owner, $message)
3100         {
3101                 $sigmsg = $message;
3102                 unset($sigmsg["author_signature"]);
3103                 unset($sigmsg["parent_author_signature"]);
3104
3105                 $signed_text = implode(";", $sigmsg);
3106
3107                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3108         }
3109
3110         /**
3111          * @brief Transmit a message to a target server
3112          *
3113          * @param array  $owner        the array of the item owner
3114          * @param array  $contact      Target of the communication
3115          * @param string $envelope     The message that is to be transmitted
3116          * @param bool   $public_batch Is it a public post?
3117          * @param string $guid         message guid
3118          *
3119          * @return int Result of the transmission
3120          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3121          * @throws \ImagickException
3122          */
3123         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
3124         {
3125                 $enabled = intval(Config::get("system", "diaspora_enabled"));
3126                 if (!$enabled) {
3127                         return 200;
3128                 }
3129
3130                 $logid = Strings::getRandomHex(4);
3131
3132                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3133
3134                 // We always try to use the data from the fcontact table.
3135                 // This is important for transmitting data to Friendica servers.
3136                 if (!empty($contact['addr'])) {
3137                         $fcontact = self::personByHandle($contact['addr']);
3138                         if (!empty($fcontact)) {
3139                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3140                         }
3141                 }
3142
3143                 if (!$dest_url) {
3144                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3145                         return 0;
3146                 }
3147
3148                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3149
3150                 if (!intval(Config::get("system", "diaspora_test"))) {
3151                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3152
3153                         $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3154                         $return_code = $postResult->getReturnCode();
3155                 } else {
3156                         Logger::log("test_mode");
3157                         return 200;
3158                 }
3159
3160                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3161
3162                 return $return_code ? $return_code : -1;
3163         }
3164
3165
3166         /**
3167          * @brief Build the post xml
3168          *
3169          * @param string $type    The message type
3170          * @param array  $message The message data
3171          *
3172          * @return string The post XML
3173          */
3174         public static function buildPostXml($type, $message)
3175         {
3176                 $data = [$type => $message];
3177
3178                 return XML::fromArray($data, $xml);
3179         }
3180
3181         /**
3182          * @brief Builds and transmit messages
3183          *
3184          * @param array  $owner        the array of the item owner
3185          * @param array  $contact      Target of the communication
3186          * @param string $type         The message type
3187          * @param array  $message      The message data
3188          * @param bool   $public_batch Is it a public post?
3189          * @param string $guid         message guid
3190          *
3191          * @return int Result of the transmission
3192          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3193          * @throws \ImagickException
3194          */
3195         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "")
3196         {
3197                 $msg = self::buildPostXml($type, $message);
3198
3199                 Logger::log('message: '.$msg, Logger::DATA);
3200                 Logger::log('send guid '.$guid, Logger::DEBUG);
3201
3202                 // Fallback if the private key wasn't transmitted in the expected field
3203                 if (empty($owner['uprvkey'])) {
3204                         $owner['uprvkey'] = $owner['prvkey'];
3205                 }
3206
3207                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3208
3209                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3210
3211                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3212
3213                 return $return_code;
3214         }
3215
3216         /**
3217          * @brief sends a participation (Used to get all further updates)
3218          *
3219          * @param array $contact Target of the communication
3220          * @param array $item    Item array
3221          *
3222          * @return int The result of the transmission
3223          * @throws \Exception
3224          */
3225         private static function sendParticipation(array $contact, array $item)
3226         {
3227                 // Don't send notifications for private postings
3228                 if ($item['private']) {
3229                         return;
3230                 }
3231
3232                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3233
3234                 $result = Cache::get($cachekey);
3235                 if (!is_null($result)) {
3236                         return;
3237                 }
3238
3239                 // Fetch some user id to have a valid handle to transmit the participation.
3240                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3241                 // If the item belongs to a user, we take this user id.
3242                 if ($item['uid'] == 0) {
3243                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3244                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3245                         $owner = User::getOwnerDataById($first_user['uid']);
3246                 } else {
3247                         $owner = User::getOwnerDataById($item['uid']);
3248                 }
3249
3250                 $author = self::myHandle($owner);
3251
3252                 $message = ["author" => $author,
3253                                 "guid" => System::createUUID(),
3254                                 "parent_type" => "Post",
3255                                 "parent_guid" => $item["guid"]];
3256
3257                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3258
3259                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3260                 Cache::set($cachekey, $item["guid"], Cache::QUARTER_HOUR);
3261
3262                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3263         }
3264
3265         /**
3266          * @brief sends an account migration
3267          *
3268          * @param array $owner   the array of the item owner
3269          * @param array $contact Target of the communication
3270          * @param int   $uid     User ID
3271          *
3272          * @return int The result of the transmission
3273          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3274          * @throws \ImagickException
3275          */
3276         public static function sendAccountMigration(array $owner, array $contact, $uid)
3277         {
3278                 $old_handle = PConfig::get($uid, 'system', 'previous_addr');
3279                 $profile = self::createProfileData($uid);
3280
3281                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3282                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3283
3284                 $message = ["author" => $old_handle,
3285                                 "profile" => $profile,
3286                                 "signature" => $signature];
3287
3288                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3289
3290                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3291         }
3292
3293         /**
3294          * @brief Sends a "share" message
3295          *
3296          * @param array $owner   the array of the item owner
3297          * @param array $contact Target of the communication
3298          *
3299          * @return int The result of the transmission
3300          * @throws \Exception
3301          */
3302         public static function sendShare(array $owner, array $contact)
3303         {
3304                 /**
3305                  * @todo support the different possible combinations of "following" and "sharing"
3306                  * Currently, Diaspora only interprets the "sharing" field
3307                  *
3308                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3309                  */
3310
3311                 /*
3312                 switch ($contact["rel"]) {
3313                         case Contact::FRIEND:
3314                                 $following = true;
3315                                 $sharing = true;
3316
3317                         case Contact::SHARING:
3318                                 $following = false;
3319                                 $sharing = true;
3320
3321                         case Contact::FOLLOWER:
3322                                 $following = true;
3323                                 $sharing = false;
3324                 }
3325                 */
3326
3327                 $message = ["author" => self::myHandle($owner),
3328                                 "recipient" => $contact["addr"],
3329                                 "following" => "true",
3330                                 "sharing" => "true"];
3331
3332                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3333
3334                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3335         }
3336
3337         /**
3338          * @brief sends an "unshare"
3339          *
3340          * @param array $owner   the array of the item owner
3341          * @param array $contact Target of the communication
3342          *
3343          * @return int The result of the transmission
3344          * @throws \Exception
3345          */
3346         public static function sendUnshare(array $owner, array $contact)
3347         {
3348                 $message = ["author" => self::myHandle($owner),
3349                                 "recipient" => $contact["addr"],
3350                                 "following" => "false",
3351                                 "sharing" => "false"];
3352
3353                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3354
3355                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3356         }
3357
3358         /**
3359          * @brief Checks a message body if it is a reshare
3360          *
3361          * @param string $body     The message body that is to be check
3362          * @param bool   $complete Should it be a complete check or a simple check?
3363          *
3364          * @return array|bool Reshare details or "false" if no reshare
3365          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3366          * @throws \ImagickException
3367          */
3368         public static function isReshare($body, $complete = true)
3369         {
3370                 $body = trim($body);
3371
3372                 // Skip if it isn't a pure repeated messages
3373                 // Does it start with a share?
3374                 if ((strpos($body, "[share") > 0) && $complete) {
3375                         return false;
3376                 }
3377
3378                 // Does it end with a share?
3379                 if (strlen($body) > (strrpos($body, "[/share]") + 8)) {
3380                         return false;
3381                 }
3382
3383                 $attributes = preg_replace("/\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", "$1", $body);
3384                 // Skip if there is no shared message in there
3385                 if ($body == $attributes) {
3386                         return false;
3387                 }
3388
3389                 // If we don't do the complete check we quit here
3390
3391                 $guid = "";
3392                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
3393                 if (!empty($matches[1])) {
3394                         $guid = $matches[1];
3395                 }
3396
3397                 preg_match('/guid="(.*?)"/ism', $attributes, $matches);
3398                 if (!empty($matches[1])) {
3399                         $guid = $matches[1];
3400                 }
3401
3402                 if (($guid != "") && $complete) {
3403                         $condition = ['guid' => $guid, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3404                         $item = Item::selectFirst(['contact-id'], $condition);
3405                         if (DBA::isResult($item)) {
3406                                 $ret= [];
3407                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3408                                 $ret["root_guid"] = $guid;
3409                                 return $ret;
3410                         } elseif ($complete) {
3411                                 // We are resharing something that isn't a DFRN or Diaspora post.
3412                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3413                                 return false;
3414                         }
3415                 } elseif (($guid == "") && $complete) {
3416                         return false;
3417                 }
3418
3419                 $ret["root_guid"] = $guid;
3420
3421                 $profile = "";
3422                 preg_match("/profile='(.*?)'/ism", $attributes, $matches);
3423                 if (!empty($matches[1])) {
3424                         $profile = $matches[1];
3425                 }
3426
3427                 preg_match('/profile="(.*?)"/ism', $attributes, $matches);
3428                 if (!empty($matches[1])) {
3429                         $profile = $matches[1];
3430                 }
3431
3432                 $ret= [];
3433
3434                 if ($profile != "") {
3435                         if (Contact::getIdForURL($profile)) {
3436                                 $author = Contact::getDetailsByURL($profile);
3437                                 $ret["root_handle"] = $author['addr'];
3438                         }
3439                 }
3440
3441                 if (empty($ret) && !$complete) {
3442                         return true;
3443                 }
3444
3445                 return $ret;
3446         }
3447
3448         /**
3449          * @brief Create an event array
3450          *
3451          * @param integer $event_id The id of the event
3452          *
3453          * @return array with event data
3454          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3455          */
3456         private static function buildEvent($event_id)
3457         {
3458                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3459                 if (!DBA::isResult($r)) {
3460                         return [];
3461                 }
3462
3463                 $event = $r[0];
3464
3465                 $eventdata = [];
3466
3467                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3468                 if (!DBA::isResult($r)) {
3469                         return [];
3470                 }
3471
3472                 $user = $r[0];
3473
3474                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3475                 if (!DBA::isResult($r)) {
3476                         return [];
3477                 }
3478
3479                 $owner = $r[0];
3480
3481                 $eventdata['author'] = self::myHandle($owner);
3482
3483                 if ($event['guid']) {
3484                         $eventdata['guid'] = $event['guid'];
3485                 }
3486
3487                 $mask = DateTimeFormat::ATOM;
3488
3489                 /// @todo - establish "all day" events in Friendica
3490                 $eventdata["all_day"] = "false";
3491
3492                 $eventdata['timezone'] = 'UTC';
3493                 if (!$event['adjust'] && $user['timezone']) {
3494                         $eventdata['timezone'] = $user['timezone'];
3495                 }
3496
3497                 if ($event['start']) {
3498                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3499                 }
3500                 if ($event['finish'] && !$event['nofinish']) {
3501                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3502                 }
3503                 if ($event['summary']) {
3504                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3505                 }
3506                 if ($event['desc']) {
3507                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3508                 }
3509                 if ($event['location']) {
3510                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3511                         $coord = Map::getCoordinates($event['location']);
3512
3513                         $location = [];
3514                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3515                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3516                                 $location["lat"] = $coord['lat'];
3517                                 $location["lng"] = $coord['lon'];
3518                         } else {
3519                                 $location["lat"] = 0;
3520                                 $location["lng"] = 0;
3521                         }
3522                         $eventdata['location'] = $location;
3523                 }
3524
3525                 return $eventdata;
3526         }
3527
3528         /**
3529          * @brief Create a post (status message or reshare)
3530          *
3531          * @param array $item  The item that will be exported
3532          * @param array $owner the array of the item owner
3533          *
3534          * @return array
3535          * 'type' -> Message type ("status_message" or "reshare")
3536          * 'message' -> Array of XML elements of the status
3537          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3538          * @throws \ImagickException
3539          */
3540         public static function buildStatus(array $item, array $owner)
3541         {
3542                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3543
3544                 $result = Cache::get($cachekey);
3545                 if (!is_null($result)) {
3546                         return $result;
3547                 }
3548
3549                 $myaddr = self::myHandle($owner);
3550
3551                 $public = ($item["private"] ? "false" : "true");
3552
3553                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3554                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3555
3556                 // Detect a share element and do a reshare
3557                 if (!$item['private'] && ($ret = self::isReshare($item["body"]))) {
3558                         $message = ["author" => $myaddr,
3559                                         "guid" => $item["guid"],
3560                                         "created_at" => $created,
3561                                         "root_author" => $ret["root_handle"],
3562                                         "root_guid" => $ret["root_guid"],
3563                                         "provider_display_name" => $item["app"],
3564                                         "public" => $public];
3565
3566                         $type = "reshare";
3567                 } else {
3568                         $title = $item["title"];
3569                         $body = $item["body"];
3570
3571                         if ($item['author-link'] != $item['owner-link']) {
3572                                 require_once 'mod/share.php';
3573                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3574                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3575                         }
3576
3577                         // convert to markdown
3578                         $body = html_entity_decode(BBCode::toMarkdown($body));
3579
3580                         // Adding the title
3581                         if (strlen($title)) {
3582                                 $body = "## ".html_entity_decode($title)."\n\n".$body;
3583                         }
3584
3585                         if ($item["attach"]) {
3586                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3587                                 if ($cnt) {
3588                                         $body .= "\n".L10n::t("Attachments:")."\n";
3589                                         foreach ($matches as $mtch) {
3590                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3591                                         }
3592                                 }
3593                         }
3594
3595                         $location = [];
3596
3597                         if ($item["location"] != "")
3598                                 $location["address"] = $item["location"];
3599
3600                         if ($item["coord"] != "") {
3601                                 $coord = explode(" ", $item["coord"]);
3602                                 $location["lat"] = $coord[0];
3603                                 $location["lng"] = $coord[1];
3604                         }
3605
3606                         $message = ["author" => $myaddr,
3607                                         "guid" => $item["guid"],
3608                                         "created_at" => $created,
3609                                         "edited_at" => $edited,
3610                                         "public" => $public,
3611                                         "text" => $body,
3612                                         "provider_display_name" => $item["app"],
3613                                         "location" => $location];
3614
3615                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3616                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3617                                 unset($message["location"]);
3618                         }
3619
3620                         if ($item['event-id'] > 0) {
3621                                 $event = self::buildEvent($item['event-id']);
3622                                 if (count($event)) {
3623                                         $message['event'] = $event;
3624
3625                                         if (!empty($event['location']['address']) &&
3626                                                 !empty($event['location']['lat']) &&
3627                                                 !empty($event['location']['lng'])) {
3628                                                 $message['location'] = $event['location'];
3629                                         }
3630
3631                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3632                                         // $message['text'] = '';
3633                                 }
3634                         }
3635
3636                         $type = "status_message";
3637                 }
3638
3639                 $msg = ["type" => $type, "message" => $message];
3640
3641                 Cache::set($cachekey, $msg, Cache::QUARTER_HOUR);
3642
3643                 return $msg;
3644         }
3645
3646         private static function prependParentAuthorMention($body, $profile_url)
3647         {
3648                 $profile = Contact::getDetailsByURL($profile_url);
3649                 if (!empty($profile['addr'])
3650                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3651                         && !strstr($body, $profile['addr'])
3652                         && !strstr($body, $profile_url)
3653                 ) {
3654                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3655                 }
3656
3657                 return $body;
3658         }
3659
3660         /**
3661          * @brief Sends a post
3662          *
3663          * @param array $item         The item that will be exported
3664          * @param array $owner        the array of the item owner
3665          * @param array $contact      Target of the communication
3666          * @param bool  $public_batch Is it a public post?
3667          *
3668          * @return int The result of the transmission
3669          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3670          * @throws \ImagickException
3671          */
3672         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3673         {
3674                 $status = self::buildStatus($item, $owner);
3675
3676                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3677         }
3678
3679         /**
3680          * @brief Creates a "like" object
3681          *
3682          * @param array $item  The item that will be exported
3683          * @param array $owner the array of the item owner
3684          *
3685          * @return array The data for a "like"
3686          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3687          */
3688         private static function constructLike(array $item, array $owner)
3689         {
3690                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3691                 if (!DBA::isResult($parent)) {
3692                         return false;
3693                 }
3694
3695                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3696                 $positive = null;
3697                 if ($item['verb'] === ACTIVITY_LIKE) {
3698                         $positive = "true";
3699                 } elseif ($item['verb'] === ACTIVITY_DISLIKE) {
3700                         $positive = "false";
3701                 }
3702
3703                 return(["author" => self::myHandle($owner),
3704                                 "guid" => $item["guid"],
3705                                 "parent_guid" => $parent["guid"],
3706                                 "parent_type" => $target_type,
3707                                 "positive" => $positive,
3708                                 "author_signature" => ""]);
3709         }
3710
3711         /**
3712          * @brief Creates an "EventParticipation" object
3713          *
3714          * @param array $item  The item that will be exported
3715          * @param array $owner the array of the item owner
3716          *
3717          * @return array The data for an "EventParticipation"
3718          * @throws \Exception
3719          */
3720         private static function constructAttend(array $item, array $owner)
3721         {
3722                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3723                 if (!DBA::isResult($parent)) {
3724                         return false;
3725                 }
3726
3727                 switch ($item['verb']) {
3728                         case ACTIVITY_ATTEND:
3729                                 $attend_answer = 'accepted';
3730                                 break;
3731                         case ACTIVITY_ATTENDNO:
3732                                 $attend_answer = 'declined';
3733                                 break;
3734                         case ACTIVITY_ATTENDMAYBE:
3735                                 $attend_answer = 'tentative';
3736                                 break;
3737                         default:
3738                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3739                                 return false;
3740                 }
3741
3742                 return(["author" => self::myHandle($owner),
3743                                 "guid" => $item["guid"],
3744                                 "parent_guid" => $parent["guid"],
3745                                 "status" => $attend_answer,
3746                                 "author_signature" => ""]);
3747         }
3748
3749         /**
3750          * @brief Creates the object for a comment
3751          *
3752          * @param array $item  The item that will be exported
3753          * @param array $owner the array of the item owner
3754          *
3755          * @return array|false The data for a comment
3756          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3757          */
3758         private static function constructComment(array $item, array $owner)
3759         {
3760                 $cachekey = "diaspora:constructComment:".$item['guid'];
3761
3762                 $result = Cache::get($cachekey);
3763                 if (!is_null($result)) {
3764                         return $result;
3765                 }
3766
3767                 $toplevel_item = Item::selectFirst(['guid', 'author-link'], ['id' => $item["parent"], 'parent' => $item["parent"]]);
3768                 if (!DBA::isResult($toplevel_item)) {
3769                         Logger::error('Missing parent conversation item', ['parent' => $item["parent"]]);
3770                         return false;
3771                 }
3772
3773                 $thread_parent_item = $toplevel_item;
3774                 if ($item['thr-parent'] != $item['parent-uri']) {
3775                         $thread_parent_item = Item::selectFirst(['guid', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3776                 }
3777
3778                 $body = $item["body"];
3779
3780                 if ((empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3781                         && !Config::get('system', 'disable_implicit_mentions')
3782                 ) {
3783                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3784                 }
3785
3786                 $text = html_entity_decode(BBCode::toMarkdown($body));
3787                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3788                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3789
3790                 $comment = [
3791                         "author"      => self::myHandle($owner),
3792                         "guid"        => $item["guid"],
3793                         "created_at"  => $created,
3794                         "edited_at"   => $edited,
3795                         "parent_guid" => $toplevel_item["guid"],
3796                         "text"        => $text,
3797                         "author_signature" => ""
3798                 ];
3799
3800                 // Send the thread parent guid only if it is a threaded comment
3801                 if ($item['thr-parent'] != $item['parent-uri']) {
3802                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3803                 }
3804
3805                 Cache::set($cachekey, $comment, Cache::QUARTER_HOUR);
3806
3807                 return($comment);
3808         }
3809
3810         /**
3811          * @brief Send a like or a comment
3812          *
3813          * @param array $item         The item that will be exported
3814          * @param array $owner        the array of the item owner
3815          * @param array $contact      Target of the communication
3816          * @param bool  $public_batch Is it a public post?
3817          *
3818          * @return int The result of the transmission
3819          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3820          * @throws \ImagickException
3821          */
3822         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3823         {
3824                 if (in_array($item['verb'], [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE])) {
3825                         $message = self::constructAttend($item, $owner);
3826                         $type = "event_participation";
3827                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3828                         $message = self::constructLike($item, $owner);
3829                         $type = "like";
3830                 } elseif (!in_array($item["verb"], [ACTIVITY_FOLLOW, ACTIVITY_TAG])) {
3831                         $message = self::constructComment($item, $owner);
3832                         $type = "comment";
3833                 }
3834
3835                 if (empty($message)) {
3836                         return false;
3837                 }
3838
3839                 $message["author_signature"] = self::signature($owner, $message);
3840
3841                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3842         }
3843
3844         /**
3845          * @brief Creates a message from a signature record entry
3846          *
3847          * @param array $item The item that will be exported
3848          * @return array The message
3849          */
3850         private static function messageFromSignature(array $item)
3851         {
3852                 // Split the signed text
3853                 $signed_parts = explode(";", $item['signed_text']);
3854
3855                 if ($item["deleted"]) {
3856                         $message = ["author" => $item['signer'],
3857                                         "target_guid" => $signed_parts[0],
3858                                         "target_type" => $signed_parts[1]];
3859                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3860                         $message = ["author" => $signed_parts[4],
3861                                         "guid" => $signed_parts[1],
3862                                         "parent_guid" => $signed_parts[3],
3863                                         "parent_type" => $signed_parts[2],
3864                                         "positive" => $signed_parts[0],
3865                                         "author_signature" => $item['signature'],
3866                                         "parent_author_signature" => ""];
3867                 } else {
3868                         // Remove the comment guid
3869                         $guid = array_shift($signed_parts);
3870
3871                         // Remove the parent guid
3872                         $parent_guid = array_shift($signed_parts);
3873
3874                         // Remove the handle
3875                         $handle = array_pop($signed_parts);
3876
3877                         $message = [
3878                                 "author" => $handle,
3879                                 "guid" => $guid,
3880                                 "parent_guid" => $parent_guid,
3881                                 "text" => implode(";", $signed_parts),
3882                                 "author_signature" => $item['signature'],
3883                                 "parent_author_signature" => ""
3884                         ];
3885                 }
3886                 return $message;
3887         }
3888
3889         /**
3890          * @brief Relays messages (like, comment, retraction) to other servers if we are the thread owner
3891          *
3892          * @param array $item         The item that will be exported
3893          * @param array $owner        the array of the item owner
3894          * @param array $contact      Target of the communication
3895          * @param bool  $public_batch Is it a public post?
3896          *
3897          * @return int The result of the transmission
3898          * @throws \Exception
3899          */
3900         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
3901         {
3902                 if ($item["deleted"]) {
3903                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
3904                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3905                         $type = "like";
3906                 } else {
3907                         $type = "comment";
3908                 }
3909
3910                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
3911
3912                 // Old way - is used by the internal Friendica functions
3913                 /// @todo Change all signatur storing functions to the new format
3914                 if ($item['signed_text'] && $item['signature'] && $item['signer']) {
3915                         $message = self::messageFromSignature($item);
3916                 } else {// New way
3917                         $msg = json_decode($item['signed_text'], true);
3918
3919                         $message = [];
3920                         if (is_array($msg)) {
3921                                 foreach ($msg as $field => $data) {
3922                                         if (!$item["deleted"]) {
3923                                                 if ($field == "diaspora_handle") {
3924                                                         $field = "author";
3925                                                 }
3926                                                 if ($field == "target_type") {
3927                                                         $field = "parent_type";
3928                                                 }
3929                                         }
3930
3931                                         $message[$field] = $data;
3932                                 }
3933                         } else {
3934                                 Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
3935                         }
3936                 }
3937
3938                 $message["parent_author_signature"] = self::signature($owner, $message);
3939
3940                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
3941
3942                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3943         }
3944
3945         /**
3946          * @brief Sends a retraction (deletion) of a message, like or comment
3947          *
3948          * @param array $item         The item that will be exported
3949          * @param array $owner        the array of the item owner
3950          * @param array $contact      Target of the communication
3951          * @param bool  $public_batch Is it a public post?
3952          * @param bool  $relay        Is the retraction transmitted from a relay?
3953          *
3954          * @return int The result of the transmission
3955          * @throws \Exception
3956          */
3957         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
3958         {
3959                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
3960
3961                 $msg_type = "retraction";
3962
3963                 if ($item['id'] == $item['parent']) {
3964                         $target_type = "Post";
3965                 } elseif (in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
3966                         $target_type = "Like";
3967                 } else {
3968                         $target_type = "Comment";
3969                 }
3970
3971                 $message = ["author" => $itemaddr,
3972                                 "target_guid" => $item['guid'],
3973                                 "target_type" => $target_type];
3974
3975                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
3976
3977                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
3978         }
3979
3980         /**
3981          * @brief Sends a mail
3982          *
3983          * @param array $item    The item that will be exported
3984          * @param array $owner   The owner
3985          * @param array $contact Target of the communication
3986          *
3987          * @return int The result of the transmission
3988          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3989          * @throws \ImagickException
3990          */
3991         public static function sendMail(array $item, array $owner, array $contact)
3992         {
3993                 $myaddr = self::myHandle($owner);
3994
3995                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
3996                 if (!DBA::isResult($cnv)) {
3997                         Logger::log("conversation not found.");
3998                         return;
3999                 }
4000
4001                 $body = BBCode::toMarkdown($item["body"]);
4002                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4003
4004                 $msg = [
4005                         "author" => $myaddr,
4006                         "guid" => $item["guid"],
4007                         "conversation_guid" => $cnv["guid"],
4008                         "text" => $body,
4009                         "created_at" => $created,
4010                 ];
4011
4012                 if ($item["reply"]) {
4013                         $message = $msg;
4014                         $type = "message";
4015                 } else {
4016                         $message = [
4017                                 "author" => $cnv["creator"],
4018                                 "guid" => $cnv["guid"],
4019                                 "subject" => $cnv["subject"],
4020                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4021                                 "participants" => $cnv["recips"],
4022                                 "message" => $msg
4023                         ];
4024
4025                         $type = "conversation";
4026                 }
4027
4028                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4029         }
4030
4031         /**
4032          * @brief Split a name into first name and last name
4033          *
4034          * @param string $name The name
4035          *
4036          * @return array The array with "first" and "last"
4037          */
4038         public static function splitName($name) {
4039                 $name = trim($name);
4040
4041                 // Is the name longer than 64 characters? Then cut the rest of it.
4042                 if (strlen($name) > 64) {
4043                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4044                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4045                         } else {
4046                                 $name = substr($name, 0, 64);
4047                         }
4048                 }
4049
4050                 // Take the first word as first name
4051                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4052                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4053                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4054                         return ['first' => $first, 'last' => $last];
4055                 }
4056
4057                 // Take the last word as last name
4058                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4059                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4060
4061                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4062                         return ['first' => $first, 'last' => $last];
4063                 }
4064
4065                 // Take the first 32 characters if there is no space in the first 32 characters
4066                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4067                         $first = substr($name, 0, 32);
4068                         $last = substr($name, 32);
4069                         return ['first' => $first, 'last' => $last];
4070                 }
4071
4072                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4073                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4074
4075                 // Check if the last name is longer than 32 characters
4076                 if (strlen($last) > 32) {
4077                         if (strpos($last, ' ') <= 32) {
4078                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4079                         } else {
4080                                 $last = substr($last, 0, 32);
4081                         }
4082                 }
4083
4084                 return ['first' => $first, 'last' => $last];
4085         }
4086
4087         /**
4088          * @brief Create profile data
4089          *
4090          * @param int $uid The user id
4091          *
4092          * @return array The profile data
4093          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4094          */
4095         private static function createProfileData($uid)
4096         {
4097                 $r = q(
4098                         "SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `user`.*, `user`.`prvkey` AS `uprvkey`, `contact`.`addr`
4099                         FROM `profile`
4100                         INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
4101                         INNER JOIN `contact` ON `profile`.`uid` = `contact`.`uid`
4102                         WHERE `user`.`uid` = %d AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
4103                         intval($uid)
4104                 );
4105
4106                 if (!$r) {
4107                         return [];
4108                 }
4109
4110                 $profile = $r[0];
4111                 $handle = $profile["addr"];
4112
4113                 $split_name = self::splitName($profile['name']);
4114                 $first = $split_name['first'];
4115                 $last = $split_name['last'];
4116
4117                 $large = System::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4118                 $medium = System::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4119                 $small = System::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4120                 $searchable = (($profile['publish'] && $profile['net-publish']) ? 'true' : 'false');
4121
4122                 $dob = null;
4123                 $about = null;
4124                 $location = null;
4125                 $tags = null;
4126                 if ($searchable === 'true') {
4127                         $dob = '';
4128
4129                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4130                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4131                                 if ($year < 1004) {
4132                                         $year = 1004;
4133                                 }
4134                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4135                         }
4136
4137                         $about = $profile['about'];
4138                         $about = strip_tags(BBCode::convert($about));
4139
4140                         $location = Profile::formatLocation($profile);
4141                         $tags = '';
4142                         if ($profile['pub_keywords']) {
4143                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4144                                 $kw = str_replace('  ', ' ', $kw);
4145                                 $arr = explode(' ', $kw);
4146                                 if (count($arr)) {
4147                                         for ($x = 0; $x < 5; $x ++) {
4148                                                 if (!empty($arr[$x])) {
4149                                                         $tags .= '#'. trim($arr[$x]) .' ';
4150                                                 }
4151                                         }
4152                                 }
4153                         }
4154                         $tags = trim($tags);
4155                 }
4156
4157                 return ["author" => $handle,
4158                                 "first_name" => $first,
4159                                 "last_name" => $last,
4160                                 "image_url" => $large,
4161                                 "image_url_medium" => $medium,
4162                                 "image_url_small" => $small,
4163                                 "birthday" => $dob,
4164                                 "gender" => $profile['gender'],
4165                                 "bio" => $about,
4166                                 "location" => $location,
4167                                 "searchable" => $searchable,
4168                                 "nsfw" => "false",
4169                                 "tag_string" => $tags];
4170         }
4171
4172         /**
4173          * @brief Sends profile data
4174          *
4175          * @param int  $uid    The user id
4176          * @param bool $recips optional, default false
4177          * @return void
4178          * @throws \Exception
4179          */
4180         public static function sendProfile($uid, $recips = false)
4181         {
4182                 if (!$uid) {
4183                         return;
4184                 }
4185
4186                 $owner = User::getOwnerDataById($uid);
4187                 if (!$owner) {
4188                         return;
4189                 }
4190
4191                 if (!$recips) {
4192                         $recips = q(
4193                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4194                                 AND `uid` = %d AND `rel` != %d",
4195                                 DBA::escape(Protocol::DIASPORA),
4196                                 intval($uid),
4197                                 intval(Contact::SHARING)
4198                         );
4199                 }
4200
4201                 if (!$recips) {
4202                         return;
4203                 }
4204
4205                 $message = self::createProfileData($uid);
4206
4207                 // @ToDo Split this into single worker jobs
4208                 foreach ($recips as $recip) {
4209                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4210                         self::buildAndTransmit($owner, $recip, "profile", $message);
4211                 }
4212         }
4213
4214         /**
4215          * @brief Creates the signature for likes that are created on our system
4216          *
4217          * @param integer $uid  The user of that comment
4218          * @param array   $item Item array
4219          *
4220          * @return array Signed content
4221          * @throws \Exception
4222          */
4223         public static function createLikeSignature($uid, array $item)
4224         {
4225                 $owner = User::getOwnerDataById($uid);
4226                 if (empty($owner)) {
4227                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4228                         return false;
4229                 }
4230
4231                 if (!in_array($item["verb"], [ACTIVITY_LIKE, ACTIVITY_DISLIKE])) {
4232                         return false;
4233                 }
4234
4235                 $message = self::constructLike($item, $owner);
4236                 if ($message === false) {
4237                         return false;
4238                 }
4239
4240                 $message["author_signature"] = self::signature($owner, $message);
4241
4242                 return $message;
4243         }
4244
4245         /**
4246          * @brief Creates the signature for Comments that are created on our system
4247          *
4248          * @param integer $uid  The user of that comment
4249          * @param array   $item Item array
4250          *
4251          * @return array Signed content
4252          * @throws \Exception
4253          */
4254         public static function createCommentSignature($uid, array $item)
4255         {
4256                 $owner = User::getOwnerDataById($uid);
4257                 if (empty($owner)) {
4258                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4259                         return false;
4260                 }
4261
4262                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4263                 $item['thr-parent'] = $item['parent-uri'];
4264
4265                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4266                 if (!DBA::isResult($parent)) {
4267                         return;
4268                 }
4269
4270                 $item['parent-uri'] = $parent['parent-uri'];
4271
4272                 $message = self::constructComment($item, $owner);
4273                 if ($message === false) {
4274                         return false;
4275                 }
4276
4277                 $message["author_signature"] = self::signature($owner, $message);
4278
4279                 return $message;
4280         }
4281 }