src/Protocol/Diaspora.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol;
  23
  24 use Friendica\Content\Feature;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Content\Text\Markdown;
  27 use Friendica\Core\Cache\Duration;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Core\System;
  31 use Friendica\Core\Worker;
  32 use Friendica\Database\DBA;
  33 use Friendica\DI;
  34 use Friendica\Model\Contact;
  35 use Friendica\Model\Conversation;
  36 use Friendica\Model\GContact;
  37 use Friendica\Model\Item;
  38 use Friendica\Model\ItemURI;
  39 use Friendica\Model\Mail;
  40 use Friendica\Model\Post;
  41 use Friendica\Model\Tag;
  42 use Friendica\Model\User;
  43 use Friendica\Network\Probe;
  44 use Friendica\Util\Crypto;
  45 use Friendica\Util\DateTimeFormat;
  46 use Friendica\Util\Map;
  47 use Friendica\Util\Network;
  48 use Friendica\Util\Strings;
  49 use Friendica\Util\XML;
  50 use Friendica\Worker\Delivery;
  51 use SimpleXMLElement;
  52
  53 /**
  54  * This class contain functions to create and send Diaspora XML files
  55  */
  56 class Diaspora
  57 {
  58         /**
  59          * Mark the relay contact of the given contact for archival
  60          * This is called whenever there is a communication issue with the server.
  61          * It avoids sending stuff to servers who don't exist anymore.
  62          * The relay contact is a technical contact entry that exists once per server.
  63          *
  64          * @param array $contact of the relay contact
  65          */
  66         public static function markRelayForArchival(array $contact)
  67         {
  68                 if (!empty($contact['contact-type']) && ($contact['contact-type'] == Contact::TYPE_RELAY)) {
  69                         // This is already the relay contact, we don't need to fetch it
  70                         $relay_contact = $contact;
  71                 } elseif (empty($contact['baseurl'])) {
  72                         if (!empty($contact['batch'])) {
  73                                 $condition = ['uid' => 0, 'network' => Protocol::FEDERATED, 'batch' => $contact['batch'], 'contact-type' => Contact::TYPE_RELAY];
  74                                 $relay_contact = DBA::selectFirst('contact', [], $condition);
  75                         } else {
  76                                 return;
  77                         }
  78                 } else {
  79                         $relay_contact = self::getRelayContact($contact['baseurl'], []);
  80                 }
  81
  82                 if (!empty($relay_contact)) {
  83                         Logger::info('Relay contact will be marked for archival', ['id' => $relay_contact['id'], 'url' => $relay_contact['url']]);
  84                         Contact::markForArchival($relay_contact);
  85                 }
  86         }
  87
  88         /**
  89          * Return a list of relay servers
  90          *
  91          * The list contains not only the official relays but also servers that we serve directly
  92          *
  93          * @param integer $item_id  The id of the item that is sent
  94          * @param array   $contacts The previously fetched contacts
  95          *
  96          * @return array of relay servers
  97          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  98          */
  99         public static function relayList($item_id, array $contacts = [])
 100         {
 101                 $serverlist = [];
 102
 103                 // Fetching relay servers
 104                 $serverdata = DI::config()->get("system", "relay_server");
 105
 106                 if (!empty($serverdata)) {
 107                         $servers = explode(",", $serverdata);
 108                         foreach ($servers as $server) {
 109                                 $serverlist[$server] = trim($server);
 110                         }
 111                 }
 112
 113                 if (DI::config()->get("system", "relay_directly", false)) {
 114                         // We distribute our stuff based on the parent to ensure that the thread will be complete
 115                         $parent = Item::selectFirst(['uri-id'], ['id' => $item_id]);
 116                         if (!DBA::isResult($parent)) {
 117                                 return;
 118                         }
 119
 120                         // Servers that want to get all content
 121                         $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'all']);
 122                         while ($server = DBA::fetch($servers)) {
 123                                 $serverlist[$server['url']] = $server['url'];
 124                         }
 125                         DBA::close($servers);
 126
 127                         // All tags of the current post
 128                         $tags = DBA::select('tag-view', ['name'], ['uri-id' => $parent['uri-id'], 'type' => Tag::HASHTAG]);
 129                         $taglist = [];
 130                         while ($tag = DBA::fetch($tags)) {
 131                                 $taglist[] = $tag['name'];
 132                         }
 133                         DBA::close($tags);
 134
 135                         // All servers who wants content with this tag
 136                         $tagserverlist = [];
 137                         if (!empty($taglist)) {
 138                                 $tagserver = DBA::select('gserver-tag', ['gserver-id'], ['tag' => $taglist]);
 139                                 while ($server = DBA::fetch($tagserver)) {
 140                                         $tagserverlist[] = $server['gserver-id'];
 141                                 }
 142                                 DBA::close($tagserver);
 143                         }
 144
 145                         // All adresses with the given id
 146                         if (!empty($tagserverlist)) {
 147                                 $servers = DBA::select('gserver', ['url'], ['relay-subscribe' => true, 'relay-scope' => 'tags', 'id' => $tagserverlist]);
 148                                 while ($server = DBA::fetch($servers)) {
 149                                         $serverlist[$server['url']] = $server['url'];
 150                                 }
 151                                 DBA::close($servers);
 152                         }
 153                 }
 154
 155                 // Now we are collecting all relay contacts
 156                 foreach ($serverlist as $server_url) {
 157                         // We don't send messages to ourselves
 158                         if (Strings::compareLink($server_url, DI::baseUrl())) {
 159                                 continue;
 160                         }
 161                         $contact = self::getRelayContact($server_url);
 162                         if (is_bool($contact)) {
 163                                 continue;
 164                         }
 165
 166                         $exists = false;
 167                         foreach ($contacts as $entry) {
 168                                 if ($entry['batch'] == $contact['batch']) {
 169                                         $exists = true;
 170                                 }
 171                         }
 172
 173                         if (!$exists) {
 174                                 $contacts[] = $contact;
 175                         }
 176                 }
 177
 178                 return $contacts;
 179         }
 180
 181         /**
 182          * Return a contact for a given server address or creates a dummy entry
 183          *
 184          * @param string $server_url The url of the server
 185          * @param array $fields Fieldlist
 186          * @return array with the contact
 187          * @throws \Exception
 188          */
 189         private static function getRelayContact(string $server_url, array $fields = ['batch', 'id', 'url', 'name', 'network', 'protocol', 'archive', 'blocked'])
 190         {
 191                 // Fetch the relay contact
 192                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url),
 193                         'contact-type' => Contact::TYPE_RELAY];
 194                 $contact = DBA::selectFirst('contact', $fields, $condition);
 195
 196                 if (DBA::isResult($contact)) {
 197                         if ($contact['archive'] || $contact['blocked']) {
 198                                 return false;
 199                         }
 200                         return $contact;
 201                 } else {
 202                         self::setRelayContact($server_url);
 203
 204                         $contact = DBA::selectFirst('contact', $fields, $condition);
 205                         if (DBA::isResult($contact)) {
 206                                 return $contact;
 207                         }
 208                 }
 209
 210                 // It should never happen that we arrive here
 211                 return [];
 212         }
 213
 214         /**
 215          * Update or insert a relay contact
 216          *
 217          * @param string $server_url     The url of the server
 218          * @param array  $network_fields Optional network specific fields
 219          * @throws \Exception
 220          */
 221         public static function setRelayContact($server_url, array $network_fields = [])
 222         {
 223                 $fields = ['created' => DateTimeFormat::utcNow(),
 224                         'name' => 'relay', 'nick' => 'relay', 'url' => $server_url,
 225                         'nurl' => Strings::normaliseLink($server_url),
 226                         'network' => Protocol::DIASPORA, 'uid' => 0,
 227                         'batch' => $server_url . '/receive/public',
 228                         'rel' => Contact::FOLLOWER, 'blocked' => false,
 229                         'pending' => false, 'writable' => true,
 230                         'baseurl' => $server_url, 'contact-type' => Contact::TYPE_RELAY];
 231
 232                 $fields = array_merge($fields, $network_fields);
 233
 234                 $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($server_url)];
 235                 $old = DBA::selectFirst('contact', [], $condition);
 236                 if (DBA::isResult($old)) {
 237                         unset($fields['created']);
 238                         $condition = ['id' => $old['id']];
 239
 240                         Logger::info('Update relay contact', ['fields' => $fields, 'condition' => $condition]);
 241                         DBA::update('contact', $fields, $condition, $old);
 242                 } else {
 243                         Logger::info('Create relay contact', ['fields' => $fields]);
 244                         Contact::insert($fields);
 245                 }
 246         }
 247
 248         /**
 249          * Return a list of participating contacts for a thread
 250          *
 251          * This is used for the participation feature.
 252          * One of the parameters is a contact array.
 253          * This is done to avoid duplicates.
 254          *
 255          * @param array $item     Item that is about to be delivered
 256          * @param array $contacts The previously fetched contacts
 257          *
 258          * @return array of relay servers
 259          * @throws \Exception
 260          */
 261         public static function participantsForThread(array $item, array $contacts)
 262         {
 263                 if (!in_array($item['private'], [Item::PUBLIC, Item::UNLISTED]) || in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
 264                         Logger::info('Item is private or a participation request. It will not be relayed', ['guid' => $item['guid'], 'private' => $item['private'], 'verb' => $item['verb']]);
 265                         return $contacts;
 266                 }
 267
 268                 $items = Item::select(['author-id', 'author-link', 'parent-author-link', 'parent-guid', 'guid'],
 269                         ['parent' => $item['parent'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
 270                 while ($item = DBA::fetch($items)) {
 271                         $contact = DBA::selectFirst('contact', ['id', 'url', 'name', 'protocol', 'batch', 'network'],
 272                                 ['id' => $item['author-id']]);
 273                         if (!DBA::isResult($contact) || empty($contact['batch']) ||
 274                                 ($contact['network'] != Protocol::DIASPORA) ||
 275                                 Strings::compareLink($item['parent-author-link'], $item['author-link'])) {
 276                                 continue;
 277                         }
 278
 279                         $exists = false;
 280                         foreach ($contacts as $entry) {
 281                                 if ($entry['batch'] == $contact['batch']) {
 282                                         $exists = true;
 283                                 }
 284                         }
 285
 286                         if (!$exists) {
 287                                 Logger::info('Add participant to receiver list', ['parent' => $item['parent-guid'], 'item' => $item['guid'], 'participant' => $contact['url']]);
 288                                 $contacts[] = $contact;
 289                         }
 290                 }
 291                 DBA::close($items);
 292
 293                 return $contacts;
 294         }
 295
 296         /**
 297          * repairs a signature that was double encoded
 298          *
 299          * The function is unused at the moment. It was copied from the old implementation.
 300          *
 301          * @param string  $signature The signature
 302          * @param string  $handle    The handle of the signature owner
 303          * @param integer $level     This value is only set inside this function to avoid endless loops
 304          *
 305          * @return string the repaired signature
 306          * @throws \Exception
 307          */
 308         private static function repairSignature($signature, $handle = "", $level = 1)
 309         {
 310                 if ($signature == "") {
 311                         return ($signature);
 312                 }
 313
 314                 if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
 315                         $signature = base64_decode($signature);
 316                         Logger::log("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, Logger::DEBUG);
 317
 318                         // Do a recursive call to be able to fix even multiple levels
 319                         if ($level < 10) {
 320                                 $signature = self::repairSignature($signature, $handle, ++$level);
 321                         }
 322                 }
 323
 324                 return($signature);
 325         }
 326
 327         /**
 328          * verify the envelope and return the verified data
 329          *
 330          * @param string $envelope The magic envelope
 331          *
 332          * @return string verified data
 333          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 334          * @throws \ImagickException
 335          */
 336         private static function verifyMagicEnvelope($envelope)
 337         {
 338                 $basedom = XML::parseString($envelope, true);
 339
 340                 if (!is_object($basedom)) {
 341                         Logger::log("Envelope is no XML file");
 342                         return false;
 343                 }
 344
 345                 $children = $basedom->children('http://salmon-protocol.org/ns/magic-env');
 346
 347                 if (sizeof($children) == 0) {
 348                         Logger::log("XML has no children");
 349                         return false;
 350                 }
 351
 352                 $handle = "";
 353
 354                 $data = Strings::base64UrlDecode($children->data);
 355                 $type = $children->data->attributes()->type[0];
 356
 357                 $encoding = $children->encoding;
 358
 359                 $alg = $children->alg;
 360
 361                 $sig = Strings::base64UrlDecode($children->sig);
 362                 $key_id = $children->sig->attributes()->key_id[0];
 363                 if ($key_id != "") {
 364                         $handle = Strings::base64UrlDecode($key_id);
 365                 }
 366
 367                 $b64url_data = Strings::base64UrlEncode($data);
 368                 $msg = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
 369
 370                 $signable_data = $msg.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
 371
 372                 if ($handle == '') {
 373                         Logger::log('No author could be decoded. Discarding. Message: ' . $envelope);
 374                         return false;
 375                 }
 376
 377                 $key = self::key($handle);
 378                 if ($key == '') {
 379                         Logger::log("Couldn't get a key for handle " . $handle . ". Discarding.");
 380                         return false;
 381                 }
 382
 383                 $verify = Crypto::rsaVerify($signable_data, $sig, $key);
 384                 if (!$verify) {
 385                         Logger::log('Message from ' . $handle . ' did not verify. Discarding.');
 386                         return false;
 387                 }
 388
 389                 return $data;
 390         }
 391
 392         /**
 393          * encrypts data via AES
 394          *
 395          * @param string $key  The AES key
 396          * @param string $iv   The IV (is used for CBC encoding)
 397          * @param string $data The data that is to be encrypted
 398          *
 399          * @return string encrypted data
 400          */
 401         private static function aesEncrypt($key, $iv, $data)
 402         {
 403                 return openssl_encrypt($data, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 404         }
 405
 406         /**
 407          * decrypts data via AES
 408          *
 409          * @param string $key       The AES key
 410          * @param string $iv        The IV (is used for CBC encoding)
 411          * @param string $encrypted The encrypted data
 412          *
 413          * @return string decrypted data
 414          */
 415         private static function aesDecrypt($key, $iv, $encrypted)
 416         {
 417                 return openssl_decrypt($encrypted, 'aes-256-cbc', str_pad($key, 32, "\0"), OPENSSL_RAW_DATA, str_pad($iv, 16, "\0"));
 418         }
 419
 420         /**
 421          * Decodes incoming Diaspora message in the new format
 422          *
 423          * @param string  $raw      raw post message
 424          * @param string  $privKey   The private key of the importer
 425          * @param boolean $no_exit  Don't do an http exit on error
 426          *
 427          * @return array
 428          * 'message' -> decoded Diaspora XML message
 429          * 'author' -> author diaspora handle
 430          * 'key' -> author public key (converted to pkcs#8)
 431          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 432          * @throws \ImagickException
 433          */
 434         public static function decodeRaw(string $raw, string $privKey = '', bool $no_exit = false)
 435         {
 436                 $data = json_decode($raw);
 437
 438                 // Is it a private post? Then decrypt the outer Salmon
 439                 if (is_object($data)) {
 440                         $encrypted_aes_key_bundle = base64_decode($data->aes_key);
 441                         $ciphertext = base64_decode($data->encrypted_magic_envelope);
 442
 443                         $outer_key_bundle = '';
 444                         @openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 445                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 446
 447                         if (!is_object($j_outer_key_bundle)) {
 448                                 Logger::log('Outer Salmon did not verify. Discarding.');
 449                                 if ($no_exit) {
 450                                         return false;
 451                                 } else {
 452                                         throw new \Friendica\Network\HTTPException\BadRequestException();
 453                                 }
 454                         }
 455
 456                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 457                         $outer_key = base64_decode($j_outer_key_bundle->key);
 458
 459                         $xml = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 460                 } else {
 461                         $xml = $raw;
 462                 }
 463
 464                 $basedom = XML::parseString($xml, true);
 465
 466                 if (!is_object($basedom)) {
 467                         Logger::log('Received data does not seem to be an XML. Discarding. '.$xml);
 468                         if ($no_exit) {
 469                                 return false;
 470                         } else {
 471                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 472                         }
 473                 }
 474
 475                 $base = $basedom->children(ActivityNamespace::SALMON_ME);
 476
 477                 // Not sure if this cleaning is needed
 478                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 479
 480                 // Build the signed data
 481                 $type = $base->data[0]->attributes()->type[0];
 482                 $encoding = $base->encoding;
 483                 $alg = $base->alg;
 484                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 485
 486                 // This is the signature
 487                 $signature = Strings::base64UrlDecode($base->sig);
 488
 489                 // Get the senders' public key
 490                 $key_id = $base->sig[0]->attributes()->key_id[0];
 491                 $author_addr = base64_decode($key_id);
 492                 if ($author_addr == '') {
 493                         Logger::log('No author could be decoded. Discarding. Message: ' . $xml);
 494                         if ($no_exit) {
 495                                 return false;
 496                         } else {
 497                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 498                         }
 499                 }
 500
 501                 $key = self::key($author_addr);
 502                 if ($key == '') {
 503                         Logger::log("Couldn't get a key for handle " . $author_addr . ". Discarding.");
 504                         if ($no_exit) {
 505                                 return false;
 506                         } else {
 507                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 508                         }
 509                 }
 510
 511                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 512                 if (!$verify) {
 513                         Logger::log('Message did not verify. Discarding.');
 514                         if ($no_exit) {
 515                                 return false;
 516                         } else {
 517                                 throw new \Friendica\Network\HTTPException\BadRequestException();
 518                         }
 519                 }
 520
 521                 return ['message' => (string)Strings::base64UrlDecode($base->data),
 522                                 'author' => XML::unescape($author_addr),
 523                                 'key' => (string)$key];
 524         }
 525
 526         /**
 527          * Decodes incoming Diaspora message in the deprecated format
 528          *
 529          * @param string $xml      urldecoded Diaspora salmon
 530          * @param string $privKey  The private key of the importer
 531          *
 532          * @return array
 533          * 'message' -> decoded Diaspora XML message
 534          * 'author' -> author diaspora handle
 535          * 'key' -> author public key (converted to pkcs#8)
 536          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 537          * @throws \ImagickException
 538          */
 539         public static function decode(string $xml, string $privKey = '')
 540         {
 541                 $public = false;
 542                 $basedom = XML::parseString($xml);
 543
 544                 if (!is_object($basedom)) {
 545                         Logger::log("XML is not parseable.");
 546                         return false;
 547                 }
 548                 $children = $basedom->children('https://joindiaspora.com/protocol');
 549
 550                 $inner_aes_key = null;
 551                 $inner_iv = null;
 552
 553                 if ($children->header) {
 554                         $public = true;
 555                         $author_link = str_replace('acct:', '', $children->header->author_id);
 556                 } else {
 557                         // This happens with posts from a relais
 558                         if (empty($privKey)) {
 559                                 Logger::log("This is no private post in the old format", Logger::DEBUG);
 560                                 return false;
 561                         }
 562
 563                         $encrypted_header = json_decode(base64_decode($children->encrypted_header));
 564
 565                         $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
 566                         $ciphertext = base64_decode($encrypted_header->ciphertext);
 567
 568                         $outer_key_bundle = '';
 569                         openssl_private_decrypt($encrypted_aes_key_bundle, $outer_key_bundle, $privKey);
 570
 571                         $j_outer_key_bundle = json_decode($outer_key_bundle);
 572
 573                         $outer_iv = base64_decode($j_outer_key_bundle->iv);
 574                         $outer_key = base64_decode($j_outer_key_bundle->key);
 575
 576                         $decrypted = self::aesDecrypt($outer_key, $outer_iv, $ciphertext);
 577
 578                         Logger::log('decrypted: '.$decrypted, Logger::DEBUG);
 579                         $idom = XML::parseString($decrypted);
 580
 581                         $inner_iv = base64_decode($idom->iv);
 582                         $inner_aes_key = base64_decode($idom->aes_key);
 583
 584                         $author_link = str_replace('acct:', '', $idom->author_id);
 585                 }
 586
 587                 $dom = $basedom->children(ActivityNamespace::SALMON_ME);
 588
 589                 // figure out where in the DOM tree our data is hiding
 590
 591                 $base = null;
 592                 if ($dom->provenance->data) {
 593                         $base = $dom->provenance;
 594                 } elseif ($dom->env->data) {
 595                         $base = $dom->env;
 596                 } elseif ($dom->data) {
 597                         $base = $dom;
 598                 }
 599
 600                 if (!$base) {
 601                         Logger::log('unable to locate salmon data in xml');
 602                         throw new \Friendica\Network\HTTPException\BadRequestException();
 603                 }
 604
 605
 606                 // Stash the signature away for now. We have to find their key or it won't be good for anything.
 607                 $signature = Strings::base64UrlDecode($base->sig);
 608
 609                 // unpack the  data
 610
 611                 // strip whitespace so our data element will return to one big base64 blob
 612                 $data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
 613
 614
 615                 // stash away some other stuff for later
 616
 617                 $type = $base->data[0]->attributes()->type[0];
 618                 $keyhash = $base->sig[0]->attributes()->keyhash[0];
 619                 $encoding = $base->encoding;
 620                 $alg = $base->alg;
 621
 622
 623                 $signed_data = $data.'.'.Strings::base64UrlEncode($type).'.'.Strings::base64UrlEncode($encoding).'.'.Strings::base64UrlEncode($alg);
 624
 625
 626                 // decode the data
 627                 $data = Strings::base64UrlDecode($data);
 628
 629
 630                 if ($public) {
 631                         $inner_decrypted = $data;
 632                 } else {
 633                         // Decode the encrypted blob
 634                         $inner_encrypted = base64_decode($data);
 635                         $inner_decrypted = self::aesDecrypt($inner_aes_key, $inner_iv, $inner_encrypted);
 636                 }
 637
 638                 if (!$author_link) {
 639                         Logger::log('Could not retrieve author URI.');
 640                         throw new \Friendica\Network\HTTPException\BadRequestException();
 641                 }
 642                 // Once we have the author URI, go to the web and try to find their public key
 643                 // (first this will look it up locally if it is in the fcontact cache)
 644                 // This will also convert diaspora public key from pkcs#1 to pkcs#8
 645
 646                 Logger::log('Fetching key for '.$author_link);
 647                 $key = self::key($author_link);
 648
 649                 if (!$key) {
 650                         Logger::log('Could not retrieve author key.');
 651                         throw new \Friendica\Network\HTTPException\BadRequestException();
 652                 }
 653
 654                 $verify = Crypto::rsaVerify($signed_data, $signature, $key);
 655
 656                 if (!$verify) {
 657                         Logger::log('Message did not verify. Discarding.');
 658                         throw new \Friendica\Network\HTTPException\BadRequestException();
 659                 }
 660
 661                 Logger::log('Message verified.');
 662
 663                 return ['message' => (string)$inner_decrypted,
 664                                 'author' => XML::unescape($author_link),
 665                                 'key' => (string)$key];
 666         }
 667
 668
 669         /**
 670          * Dispatches public messages and find the fitting receivers
 671          *
 672          * @param array $msg The post that will be dispatched
 673          *
 674          * @return int The message id of the generated message, "true" or "false" if there was an error
 675          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 676          * @throws \ImagickException
 677          */
 678         public static function dispatchPublic($msg)
 679         {
 680                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
 681                 if (!$enabled) {
 682                         Logger::log("diaspora is disabled");
 683                         return false;
 684                 }
 685
 686                 if (!($fields = self::validPosting($msg))) {
 687                         Logger::log("Invalid posting");
 688                         return false;
 689                 }
 690
 691                 $importer = ["uid" => 0, "page-flags" => User::PAGE_FLAGS_FREELOVE];
 692                 $success = self::dispatch($importer, $msg, $fields);
 693
 694                 return $success;
 695         }
 696
 697         /**
 698          * Dispatches the different message types to the different functions
 699          *
 700          * @param array            $importer Array of the importer user
 701          * @param array            $msg      The post that will be dispatched
 702          * @param SimpleXMLElement $fields   SimpleXML object that contains the message
 703          *
 704          * @return int The message id of the generated message, "true" or "false" if there was an error
 705          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 706          * @throws \ImagickException
 707          */
 708         public static function dispatch(array $importer, $msg, SimpleXMLElement $fields = null)
 709         {
 710                 // The sender is the handle of the contact that sent the message.
 711                 // This will often be different with relayed messages (for example "like" and "comment")
 712                 $sender = $msg["author"];
 713
 714                 // This is only needed for private postings since this is already done for public ones before
 715                 if (is_null($fields)) {
 716                         $private = true;
 717                         if (!($fields = self::validPosting($msg))) {
 718                                 Logger::log("Invalid posting");
 719                                 return false;
 720                         }
 721                 } else {
 722                         $private = false;
 723                 }
 724
 725                 $type = $fields->getName();
 726
 727                 Logger::log("Received message type ".$type." from ".$sender." for user ".$importer["uid"], Logger::DEBUG);
 728
 729                 switch ($type) {
 730                         case "account_migration":
 731                                 if (!$private) {
 732                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 733                                         return false;
 734                                 }
 735                                 return self::receiveAccountMigration($importer, $fields);
 736
 737                         case "account_deletion":
 738                                 return self::receiveAccountDeletion($fields);
 739
 740                         case "comment":
 741                                 return self::receiveComment($importer, $sender, $fields, $msg["message"]);
 742
 743                         case "contact":
 744                                 if (!$private) {
 745                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 746                                         return false;
 747                                 }
 748                                 return self::receiveContactRequest($importer, $fields);
 749
 750                         case "conversation":
 751                                 if (!$private) {
 752                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 753                                         return false;
 754                                 }
 755                                 return self::receiveConversation($importer, $msg, $fields);
 756
 757                         case "like":
 758                                 return self::receiveLike($importer, $sender, $fields);
 759
 760                         case "message":
 761                                 if (!$private) {
 762                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 763                                         return false;
 764                                 }
 765                                 return self::receiveMessage($importer, $fields);
 766
 767                         case "participation":
 768                                 if (!$private) {
 769                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 770                                         return false;
 771                                 }
 772                                 return self::receiveParticipation($importer, $fields);
 773
 774                         case "photo": // Not implemented
 775                                 return self::receivePhoto($importer, $fields);
 776
 777                         case "poll_participation": // Not implemented
 778                                 return self::receivePollParticipation($importer, $fields);
 779
 780                         case "profile":
 781                                 if (!$private) {
 782                                         Logger::log('Message with type ' . $type . ' is not private, quitting.');
 783                                         return false;
 784                                 }
 785                                 return self::receiveProfile($importer, $fields);
 786
 787                         case "reshare":
 788                                 return self::receiveReshare($importer, $fields, $msg["message"]);
 789
 790                         case "retraction":
 791                                 return self::receiveRetraction($importer, $sender, $fields);
 792
 793                         case "status_message":
 794                                 return self::receiveStatusMessage($importer, $fields, $msg["message"]);
 795
 796                         default:
 797                                 Logger::log("Unknown message type ".$type);
 798                                 return false;
 799                 }
 800         }
 801
 802         /**
 803          * Checks if a posting is valid and fetches the data fields.
 804          *
 805          * This function does not only check the signature.
 806          * It also does the conversion between the old and the new diaspora format.
 807          *
 808          * @param array $msg Array with the XML, the sender handle and the sender signature
 809          *
 810          * @return bool|SimpleXMLElement If the posting is valid then an array with an SimpleXML object is returned
 811          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 812          * @throws \ImagickException
 813          */
 814         private static function validPosting($msg)
 815         {
 816                 $data = XML::parseString($msg["message"]);
 817
 818                 if (!is_object($data)) {
 819                         Logger::log("No valid XML ".$msg["message"], Logger::DEBUG);
 820                         return false;
 821                 }
 822
 823                 // Is this the new or the old version?
 824                 if ($data->getName() == "XML") {
 825                         $oldXML = true;
 826                         foreach ($data->post->children() as $child) {
 827                                 $element = $child;
 828                         }
 829                 } else {
 830                         $oldXML = false;
 831                         $element = $data;
 832                 }
 833
 834                 $type = $element->getName();
 835                 $orig_type = $type;
 836
 837                 Logger::log("Got message type ".$type.": ".$msg["message"], Logger::DATA);
 838
 839                 // All retractions are handled identically from now on.
 840                 // In the new version there will only be "retraction".
 841                 if (in_array($type, ["signed_retraction", "relayable_retraction"]))
 842                         $type = "retraction";
 843
 844                 if ($type == "request") {
 845                         $type = "contact";
 846                 }
 847
 848                 $fields = new SimpleXMLElement("<".$type."/>");
 849
 850                 $signed_data = "";
 851                 $author_signature = null;
 852                 $parent_author_signature = null;
 853
 854                 foreach ($element->children() as $fieldname => $entry) {
 855                         if ($oldXML) {
 856                                 // Translation for the old XML structure
 857                                 if ($fieldname == "diaspora_handle") {
 858                                         $fieldname = "author";
 859                                 }
 860                                 if ($fieldname == "participant_handles") {
 861                                         $fieldname = "participants";
 862                                 }
 863                                 if (in_array($type, ["like", "participation"])) {
 864                                         if ($fieldname == "target_type") {
 865                                                 $fieldname = "parent_type";
 866                                         }
 867                                 }
 868                                 if ($fieldname == "sender_handle") {
 869                                         $fieldname = "author";
 870                                 }
 871                                 if ($fieldname == "recipient_handle") {
 872                                         $fieldname = "recipient";
 873                                 }
 874                                 if ($fieldname == "root_diaspora_id") {
 875                                         $fieldname = "root_author";
 876                                 }
 877                                 if ($type == "status_message") {
 878                                         if ($fieldname == "raw_message") {
 879                                                 $fieldname = "text";
 880                                         }
 881                                 }
 882                                 if ($type == "retraction") {
 883                                         if ($fieldname == "post_guid") {
 884                                                 $fieldname = "target_guid";
 885                                         }
 886                                         if ($fieldname == "type") {
 887                                                 $fieldname = "target_type";
 888                                         }
 889                                 }
 890                         }
 891
 892                         if (($fieldname == "author_signature") && ($entry != "")) {
 893                                 $author_signature = base64_decode($entry);
 894                         } elseif (($fieldname == "parent_author_signature") && ($entry != "")) {
 895                                 $parent_author_signature = base64_decode($entry);
 896                         } elseif (!in_array($fieldname, ["author_signature", "parent_author_signature", "target_author_signature"])) {
 897                                 if ($signed_data != "") {
 898                                         $signed_data .= ";";
 899                                 }
 900
 901                                 $signed_data .= $entry;
 902                         }
 903                         if (!in_array($fieldname, ["parent_author_signature", "target_author_signature"])
 904                                 || ($orig_type == "relayable_retraction")
 905                         ) {
 906                                 XML::copy($entry, $fields, $fieldname);
 907                         }
 908                 }
 909
 910                 // This is something that shouldn't happen at all.
 911                 if (in_array($type, ["status_message", "reshare", "profile"])) {
 912                         if ($msg["author"] != $fields->author) {
 913                                 Logger::log("Message handle is not the same as envelope sender. Quitting this message.");
 914                                 return false;
 915                         }
 916                 }
 917
 918                 // Only some message types have signatures. So we quit here for the other types.
 919                 if (!in_array($type, ["comment", "like"])) {
 920                         return $fields;
 921                 }
 922                 // No author_signature? This is a must, so we quit.
 923                 if (!isset($author_signature)) {
 924                         Logger::log("No author signature for type ".$type." - Message: ".$msg["message"], Logger::DEBUG);
 925                         return false;
 926                 }
 927
 928                 if (isset($parent_author_signature)) {
 929                         $key = self::key($msg["author"]);
 930                         if (empty($key)) {
 931                                 Logger::log("No key found for parent author ".$msg["author"], Logger::DEBUG);
 932                                 return false;
 933                         }
 934
 935                         if (!Crypto::rsaVerify($signed_data, $parent_author_signature, $key, "sha256")) {
 936                                 Logger::log("No valid parent author signature for parent author ".$msg["author"]. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$parent_author_signature, Logger::DEBUG);
 937                                 return false;
 938                         }
 939                 }
 940
 941                 $key = self::key($fields->author);
 942                 if (empty($key)) {
 943                         Logger::log("No key found for author ".$fields->author, Logger::DEBUG);
 944                         return false;
 945                 }
 946
 947                 if (!Crypto::rsaVerify($signed_data, $author_signature, $key, "sha256")) {
 948                         Logger::log("No valid author signature for author ".$fields->author. " in type ".$type." - signed data: ".$signed_data." - Message: ".$msg["message"]." - Signature ".$author_signature, Logger::DEBUG);
 949                         return false;
 950                 } else {
 951                         return $fields;
 952                 }
 953         }
 954
 955         /**
 956          * Fetches the public key for a given handle
 957          *
 958          * @param string $handle The handle
 959          *
 960          * @return string The public key
 961          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 962          * @throws \ImagickException
 963          */
 964         private static function key($handle)
 965         {
 966                 $handle = strval($handle);
 967
 968                 Logger::log("Fetching diaspora key for: ".$handle);
 969
 970                 $r = self::personByHandle($handle);
 971                 if ($r) {
 972                         return $r["pubkey"];
 973                 }
 974
 975                 return "";
 976         }
 977
 978         /**
 979          * Fetches data for a given handle
 980          *
 981          * @param string $handle The handle
 982          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
 983          *
 984          * @return array the queried data
 985          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 986          * @throws \ImagickException
 987          */
 988         public static function personByHandle($handle, $update = null)
 989         {
 990                 $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 991                 if (!DBA::isResult($person)) {
 992                         $urls = [$handle, str_replace('http://', 'https://', $handle), Strings::normaliseLink($handle)];
 993                         $person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'url' => $urls]);
 994                 }
 995
 996                 if (DBA::isResult($person)) {
 997                         Logger::debug("In cache " . print_r($person, true));
 998
 999                         if (is_null($update)) {
1000                                 // update record occasionally so it doesn't get stale
1001                                 $d = strtotime($person["updated"]." +00:00");
1002                                 if ($d < strtotime("now - 14 days")) {
1003                                         $update = true;
1004                                 }
1005
1006                                 if ($person["guid"] == "") {
1007                                         $update = true;
1008                                 }
1009                         }
1010                 } elseif (is_null($update)) {
1011                         $update = !DBA::isResult($person);
1012                 } else {
1013                         $person = [];
1014                 }
1015
1016                 if ($update) {
1017                         Logger::log("create or refresh", Logger::DEBUG);
1018                         $r = Probe::uri($handle, Protocol::DIASPORA);
1019
1020                         // Note that Friendica contacts will return a "Diaspora person"
1021                         // if Diaspora connectivity is enabled on their server
1022                         if ($r && ($r["network"] === Protocol::DIASPORA)) {
1023                                 self::updateFContact($r);
1024
1025                                 $person = self::personByHandle($handle, false);
1026                         }
1027                 }
1028
1029                 return $person;
1030         }
1031
1032         /**
1033          * Updates the fcontact table
1034          *
1035          * @param array $arr The fcontact data
1036          * @throws \Exception
1037          */
1038         private static function updateFContact($arr)
1039         {
1040                 $fields = ['name' => $arr["name"], 'photo' => $arr["photo"],
1041                         'request' => $arr["request"], 'nick' => $arr["nick"],
1042                         'addr' => strtolower($arr["addr"]), 'guid' => $arr["guid"],
1043                         'batch' => $arr["batch"], 'notify' => $arr["notify"],
1044                         'poll' => $arr["poll"], 'confirm' => $arr["confirm"],
1045                         'alias' => $arr["alias"], 'pubkey' => $arr["pubkey"],
1046                         'updated' => DateTimeFormat::utcNow()];
1047
1048                 $condition = ['url' => $arr["url"], 'network' => $arr["network"]];
1049
1050                 DBA::update('fcontact', $fields, $condition, true);
1051         }
1052
1053         /**
1054          * get a handle (user@domain.tld) from a given contact id
1055          *
1056          * @param int $contact_id  The id in the contact table
1057          * @param int $pcontact_id The id in the contact table (Used for the public contact)
1058          *
1059          * @return string the handle
1060          * @throws \Exception
1061          */
1062         private static function handleFromContact($contact_id, $pcontact_id = 0)
1063         {
1064                 $handle = false;
1065
1066                 Logger::log("contact id is ".$contact_id." - pcontact id is ".$pcontact_id, Logger::DEBUG);
1067
1068                 if ($pcontact_id != 0) {
1069                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $pcontact_id]);
1070
1071                         if (DBA::isResult($contact) && !empty($contact["addr"])) {
1072                                 return strtolower($contact["addr"]);
1073                         }
1074                 }
1075
1076                 $r = q(
1077                         "SELECT `network`, `addr`, `self`, `url`, `nick` FROM `contact` WHERE `id` = %d",
1078                         intval($contact_id)
1079                 );
1080
1081                 if (DBA::isResult($r)) {
1082                         $contact = $r[0];
1083
1084                         Logger::log("contact 'self' = ".$contact['self']." 'url' = ".$contact['url'], Logger::DEBUG);
1085
1086                         if ($contact['addr'] != "") {
1087                                 $handle = $contact['addr'];
1088                         } else {
1089                                 $baseurl_start = strpos($contact['url'], '://') + 3;
1090                                 // allows installations in a subdirectory--not sure how Diaspora will handle
1091                                 $baseurl_length = strpos($contact['url'], '/profile') - $baseurl_start;
1092                                 $baseurl = substr($contact['url'], $baseurl_start, $baseurl_length);
1093                                 $handle = $contact['nick'].'@'.$baseurl;
1094                         }
1095                 }
1096
1097                 return strtolower($handle);
1098         }
1099
1100         /**
1101          * get a url (scheme://domain.tld/u/user) from a given Diaspora*
1102          * fcontact guid
1103          *
1104          * @param mixed $fcontact_guid Hexadecimal string guid
1105          *
1106          * @return string the contact url or null
1107          * @throws \Exception
1108          */
1109         public static function urlFromContactGuid($fcontact_guid)
1110         {
1111                 Logger::log("fcontact guid is ".$fcontact_guid, Logger::DEBUG);
1112
1113                 $r = q(
1114                         "SELECT `url` FROM `fcontact` WHERE `url` != '' AND `network` = '%s' AND `guid` = '%s'",
1115                         DBA::escape(Protocol::DIASPORA),
1116                         DBA::escape($fcontact_guid)
1117                 );
1118
1119                 if (DBA::isResult($r)) {
1120                         return $r[0]['url'];
1121                 }
1122
1123                 return null;
1124         }
1125
1126         /**
1127          * Get a contact id for a given handle
1128          *
1129          * @todo  Move to Friendica\Model\Contact
1130          *
1131          * @param int    $uid    The user id
1132          * @param string $handle The handle in the format user@domain.tld
1133          *
1134          * @return array Contact data
1135          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1136          * @throws \ImagickException
1137          */
1138         private static function contactByHandle($uid, $handle)
1139         {
1140                 $cid = Contact::getIdForURL($handle, $uid);
1141                 if (!$cid) {
1142                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1143                         return false;
1144                 }
1145
1146                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1147                 if (!DBA::isResult($contact)) {
1148                         // This here shouldn't happen at all
1149                         Logger::log("Haven't found a contact for user " . $uid . " and handle " . $handle, Logger::DEBUG);
1150                         return false;
1151                 }
1152
1153                 return $contact;
1154         }
1155
1156         /**
1157          * Checks if the given contact url does support ActivityPub
1158          *
1159          * @param string  $url    profile url
1160          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
1161          * @return boolean
1162          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1163          * @throws \ImagickException
1164          */
1165         public static function isSupportedByContactUrl($url, $update = null)
1166         {
1167                 return !empty(self::personByHandle($url, $update));
1168         }
1169
1170         /**
1171          * Check if posting is allowed for this contact
1172          *
1173          * @param array $importer   Array of the importer user
1174          * @param array $contact    The contact that is checked
1175          * @param bool  $is_comment Is the check for a comment?
1176          *
1177          * @return bool is the contact allowed to post?
1178          */
1179         private static function postAllow(array $importer, array $contact, $is_comment = false)
1180         {
1181                 /*
1182                  * Perhaps we were already sharing with this person. Now they're sharing with us.
1183                  * That makes us friends.
1184                  * Normally this should have handled by getting a request - but this could get lost
1185                  */
1186                 // It is deactivated by now, due to side effects. See issue https://github.com/friendica/friendica/pull/4033
1187                 // It is not removed by now. Possibly the code is needed?
1188                 //if (!$is_comment && $contact["rel"] == Contact::FOLLOWER && in_array($importer["page-flags"], array(User::PAGE_FLAGS_FREELOVE))) {
1189                 //      DBA::update(
1190                 //              'contact',
1191                 //              array('rel' => Contact::FRIEND, 'writable' => true),
1192                 //              array('id' => $contact["id"], 'uid' => $contact["uid"])
1193                 //      );
1194                 //
1195                 //      $contact["rel"] = Contact::FRIEND;
1196                 //      Logger::log("defining user ".$contact["nick"]." as friend");
1197                 //}
1198
1199                 // Contact server is blocked
1200                 if (Network::isUrlBlocked($contact['url'])) {
1201                         return false;
1202                         // We don't seem to like that person
1203                 } elseif ($contact["blocked"]) {
1204                         // Maybe blocked, don't accept.
1205                         return false;
1206                         // We are following this person?
1207                 } elseif (($contact["rel"] == Contact::SHARING) || ($contact["rel"] == Contact::FRIEND)) {
1208                         // Yes, then it is fine.
1209                         return true;
1210                         // Is it a post to a community?
1211                 } elseif (($contact["rel"] == Contact::FOLLOWER) && in_array($importer["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
1212                         // That's good
1213                         return true;
1214                         // Is the message a global user or a comment?
1215                 } elseif (($importer["uid"] == 0) || $is_comment) {
1216                         // Messages for the global users and comments are always accepted
1217                         return true;
1218                 }
1219
1220                 return false;
1221         }
1222
1223         /**
1224          * Fetches the contact id for a handle and checks if posting is allowed
1225          *
1226          * @param array  $importer   Array of the importer user
1227          * @param string $handle     The checked handle in the format user@domain.tld
1228          * @param bool   $is_comment Is the check for a comment?
1229          *
1230          * @return array The contact data
1231          * @throws \Exception
1232          */
1233         private static function allowedContactByHandle(array $importer, $handle, $is_comment = false)
1234         {
1235                 $contact = self::contactByHandle($importer["uid"], $handle);
1236                 if (!$contact) {
1237                         Logger::log("A Contact for handle ".$handle." and user ".$importer["uid"]." was not found");
1238                         // If a contact isn't found, we accept it anyway if it is a comment
1239                         if ($is_comment && ($importer["uid"] != 0)) {
1240                                 return self::contactByHandle(0, $handle);
1241                         } elseif ($is_comment) {
1242                                 return $importer;
1243                         } else {
1244                                 return false;
1245                         }
1246                 }
1247
1248                 if (!self::postAllow($importer, $contact, $is_comment)) {
1249                         Logger::log("The handle: ".$handle." is not allowed to post to user ".$importer["uid"]);
1250                         return false;
1251                 }
1252                 return $contact;
1253         }
1254
1255         /**
1256          * Does the message already exists on the system?
1257          *
1258          * @param int    $uid  The user id
1259          * @param string $guid The guid of the message
1260          *
1261          * @return int|bool message id if the message already was stored into the system - or false.
1262          * @throws \Exception
1263          */
1264         private static function messageExists($uid, $guid)
1265         {
1266                 $item = Item::selectFirst(['id'], ['uid' => $uid, 'guid' => $guid]);
1267                 if (DBA::isResult($item)) {
1268                         Logger::log("message ".$guid." already exists for user ".$uid);
1269                         return $item["id"];
1270                 }
1271
1272                 return false;
1273         }
1274
1275         /**
1276          * Checks for links to posts in a message
1277          *
1278          * @param array $item The item array
1279          * @return void
1280          */
1281         private static function fetchGuid(array $item)
1282         {
1283                 $expression = "=diaspora://.*?/post/([0-9A-Za-z\-_@.:]{15,254}[0-9A-Za-z])=ism";
1284                 preg_replace_callback(
1285                         $expression,
1286                         function ($match) use ($item) {
1287                                 self::fetchGuidSub($match, $item);
1288                         },
1289                         $item["body"]
1290                 );
1291
1292                 preg_replace_callback(
1293                         "&\[url=/?posts/([^\[\]]*)\](.*)\[\/url\]&Usi",
1294                         function ($match) use ($item) {
1295                                 self::fetchGuidSub($match, $item);
1296                         },
1297                         $item["body"]
1298                 );
1299         }
1300
1301         /**
1302          * Checks for relative /people/* links in an item body to match local
1303          * contacts or prepends the remote host taken from the author link.
1304          *
1305          * @param string $body        The item body to replace links from
1306          * @param string $author_link The author link for missing local contact fallback
1307          *
1308          * @return string the replaced string
1309          */
1310         public static function replacePeopleGuid($body, $author_link)
1311         {
1312                 $return = preg_replace_callback(
1313                         "&\[url=/people/([^\[\]]*)\](.*)\[\/url\]&Usi",
1314                         function ($match) use ($author_link) {
1315                                 // $match
1316                                 // 0 => '[url=/people/0123456789abcdef]Foo Bar[/url]'
1317                                 // 1 => '0123456789abcdef'
1318                                 // 2 => 'Foo Bar'
1319                                 $handle = self::urlFromContactGuid($match[1]);
1320
1321                                 if ($handle) {
1322                                         $return = '@[url='.$handle.']'.$match[2].'[/url]';
1323                                 } else {
1324                                         // No local match, restoring absolute remote URL from author scheme and host
1325                                         $author_url = parse_url($author_link);
1326                                         $return = '[url='.$author_url['scheme'].'://'.$author_url['host'].'/people/'.$match[1].']'.$match[2].'[/url]';
1327                                 }
1328
1329                                 return $return;
1330                         },
1331                         $body
1332                 );
1333
1334                 return $return;
1335         }
1336
1337         /**
1338          * sub function of "fetchGuid" which checks for links in messages
1339          *
1340          * @param array $match array containing a link that has to be checked for a message link
1341          * @param array $item  The item array
1342          * @return void
1343          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1344          * @throws \ImagickException
1345          */
1346         private static function fetchGuidSub($match, $item)
1347         {
1348                 if (!self::storeByGuid($match[1], $item["author-link"])) {
1349                         self::storeByGuid($match[1], $item["owner-link"]);
1350                 }
1351         }
1352
1353         /**
1354          * Fetches an item with a given guid from a given server
1355          *
1356          * @param string $guid   the message guid
1357          * @param string $server The server address
1358          * @param int    $uid    The user id of the user
1359          *
1360          * @return int the message id of the stored message or false
1361          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1362          * @throws \ImagickException
1363          */
1364         private static function storeByGuid($guid, $server, $uid = 0)
1365         {
1366                 $serverparts = parse_url($server);
1367
1368                 if (empty($serverparts["host"]) || empty($serverparts["scheme"])) {
1369                         return false;
1370                 }
1371
1372                 $server = $serverparts["scheme"]."://".$serverparts["host"];
1373
1374                 Logger::log("Trying to fetch item ".$guid." from ".$server, Logger::DEBUG);
1375
1376                 $msg = self::message($guid, $server);
1377
1378                 if (!$msg) {
1379                         return false;
1380                 }
1381
1382                 Logger::log("Successfully fetched item ".$guid." from ".$server, Logger::DEBUG);
1383
1384                 // Now call the dispatcher
1385                 return self::dispatchPublic($msg);
1386         }
1387
1388         /**
1389          * Fetches a message from a server
1390          *
1391          * @param string $guid   message guid
1392          * @param string $server The url of the server
1393          * @param int    $level  Endless loop prevention
1394          *
1395          * @return array
1396          *      'message' => The message XML
1397          *      'author' => The author handle
1398          *      'key' => The public key of the author
1399          * @throws \Exception
1400          */
1401         private static function message($guid, $server, $level = 0)
1402         {
1403                 if ($level > 5) {
1404                         return false;
1405                 }
1406
1407                 // This will work for new Diaspora servers and Friendica servers from 3.5
1408                 $source_url = $server."/fetch/post/".urlencode($guid);
1409
1410                 Logger::log("Fetch post from ".$source_url, Logger::DEBUG);
1411
1412                 $envelope = Network::fetchUrl($source_url);
1413                 if ($envelope) {
1414                         Logger::log("Envelope was fetched.", Logger::DEBUG);
1415                         $x = self::verifyMagicEnvelope($envelope);
1416                         if (!$x) {
1417                                 Logger::log("Envelope could not be verified.", Logger::DEBUG);
1418                         } else {
1419                                 Logger::log("Envelope was verified.", Logger::DEBUG);
1420                         }
1421                 } else {
1422                         $x = false;
1423                 }
1424
1425                 if (!$x) {
1426                         return false;
1427                 }
1428
1429                 $source_xml = XML::parseString($x);
1430
1431                 if (!is_object($source_xml)) {
1432                         return false;
1433                 }
1434
1435                 if ($source_xml->post->reshare) {
1436                         // Reshare of a reshare - old Diaspora version
1437                         Logger::log("Message is a reshare", Logger::DEBUG);
1438                         return self::message($source_xml->post->reshare->root_guid, $server, ++$level);
1439                 } elseif ($source_xml->getName() == "reshare") {
1440                         // Reshare of a reshare - new Diaspora version
1441                         Logger::log("Message is a new reshare", Logger::DEBUG);
1442                         return self::message($source_xml->root_guid, $server, ++$level);
1443                 }
1444
1445                 $author = "";
1446
1447                 // Fetch the author - for the old and the new Diaspora version
1448                 if ($source_xml->post->status_message && $source_xml->post->status_message->diaspora_handle) {
1449                         $author = (string)$source_xml->post->status_message->diaspora_handle;
1450                 } elseif ($source_xml->author && ($source_xml->getName() == "status_message")) {
1451                         $author = (string)$source_xml->author;
1452                 }
1453
1454                 // If this isn't a "status_message" then quit
1455                 if (!$author) {
1456                         Logger::log("Message doesn't seem to be a status message", Logger::DEBUG);
1457                         return false;
1458                 }
1459
1460                 $msg = ["message" => $x, "author" => $author];
1461
1462                 $msg["key"] = self::key($msg["author"]);
1463
1464                 return $msg;
1465         }
1466
1467         /**
1468          * Fetches an item with a given URL
1469          *
1470          * @param string $url the message url
1471          *
1472          * @return int the message id of the stored message or false
1473          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1474          * @throws \ImagickException
1475          */
1476         public static function fetchByURL($url, $uid = 0)
1477         {
1478                 // Check for Diaspora (and Friendica) typical paths
1479                 if (!preg_match("=(https?://.+)/(?:posts|display|objects)/([a-zA-Z0-9-_@.:%]+[a-zA-Z0-9])=i", $url, $matches)) {
1480                         Logger::info('Invalid url', ['url' => $url]);
1481                         return false;
1482                 }
1483
1484                 $guid = urldecode($matches[2]);
1485
1486                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1487                 if (DBA::isResult($item)) {
1488                         Logger::info('Found', ['id' => $item['id']]);
1489                         return $item['id'];
1490                 }
1491
1492                 Logger::info('Fetch GUID from origin', ['guid' => $guid, 'server' => $matches[1]]);
1493                 $ret = self::storeByGuid($guid, $matches[1], $uid);
1494                 Logger::info('Result', ['ret' => $ret]);
1495
1496                 $item = Item::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
1497                 if (DBA::isResult($item)) {
1498                         Logger::info('Found', ['id' => $item['id']]);
1499                         return $item['id'];
1500                 } else {
1501                         Logger::info('Not found', ['guid' => $guid, 'uid' => $uid]);
1502                         return false;
1503                 }
1504         }
1505
1506         /**
1507          * Fetches the item record of a given guid
1508          *
1509          * @param int    $uid     The user id
1510          * @param string $guid    message guid
1511          * @param string $author  The handle of the item
1512          * @param array  $contact The contact of the item owner
1513          *
1514          * @return array the item record
1515          * @throws \Exception
1516          */
1517         private static function parentItem($uid, $guid, $author, array $contact)
1518         {
1519                 $fields = ['id', 'parent', 'body', 'wall', 'uri', 'guid', 'private', 'origin',
1520                         'author-name', 'author-link', 'author-avatar', 'gravity',
1521                         'owner-name', 'owner-link', 'owner-avatar'];
1522                 $condition = ['uid' => $uid, 'guid' => $guid];
1523                 $item = Item::selectFirst($fields, $condition);
1524
1525                 if (!DBA::isResult($item)) {
1526                         $person = self::personByHandle($author);
1527                         $result = self::storeByGuid($guid, $person["url"], $uid);
1528
1529                         // We don't have an url for items that arrived at the public dispatcher
1530                         if (!$result && !empty($contact["url"])) {
1531                                 $result = self::storeByGuid($guid, $contact["url"], $uid);
1532                         }
1533
1534                         if ($result) {
1535                                 Logger::log("Fetched missing item ".$guid." - result: ".$result, Logger::DEBUG);
1536
1537                                 $item = Item::selectFirst($fields, $condition);
1538                         }
1539                 }
1540
1541                 if (!DBA::isResult($item)) {
1542                         Logger::log("parent item not found: parent: ".$guid." - user: ".$uid);
1543                         return false;
1544                 } else {
1545                         Logger::log("parent item found: parent: ".$guid." - user: ".$uid);
1546                         return $item;
1547                 }
1548         }
1549
1550         /**
1551          * returns contact details
1552          *
1553          * @param array $def_contact The default contact if the person isn't found
1554          * @param array $person      The record of the person
1555          * @param int   $uid         The user id
1556          *
1557          * @return array
1558          *      'cid' => contact id
1559          *      'network' => network type
1560          * @throws \Exception
1561          */
1562         private static function authorContactByUrl($def_contact, $person, $uid)
1563         {
1564                 $condition = ['nurl' => Strings::normaliseLink($person["url"]), 'uid' => $uid];
1565                 $contact = DBA::selectFirst('contact', ['id', 'network'], $condition);
1566                 if (DBA::isResult($contact)) {
1567                         $cid = $contact["id"];
1568                         $network = $contact["network"];
1569                 } else {
1570                         $cid = $def_contact["id"];
1571                         $network = Protocol::DIASPORA;
1572                 }
1573
1574                 return ["cid" => $cid, "network" => $network];
1575         }
1576
1577         /**
1578          * Is the profile a hubzilla profile?
1579          *
1580          * @param string $url The profile link
1581          *
1582          * @return bool is it a hubzilla server?
1583          */
1584         private static function isHubzilla($url)
1585         {
1586                 return(strstr($url, '/channel/'));
1587         }
1588
1589         /**
1590          * Generate a post link with a given handle and message guid
1591          *
1592          * @param string $addr        The user handle
1593          * @param string $guid        message guid
1594          * @param string $parent_guid optional parent guid
1595          *
1596          * @return string the post link
1597          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1598          * @throws \ImagickException
1599          */
1600         private static function plink($addr, $guid, $parent_guid = '')
1601         {
1602                 $contact = Contact::getDetailsByAddr($addr);
1603                 if (empty($contact)) {
1604                         Logger::info('No contact data for address', ['addr' => $addr]);
1605                         return '';
1606                 }
1607
1608                 if (empty($contact['baseurl'])) {
1609                         $contact['baseurl'] = 'https://' . substr($addr, strpos($addr, '@') + 1);
1610                         Logger::info('Create baseurl from address', ['baseurl' => $contact['baseurl'], 'url' => $contact['url']]);
1611                 }
1612
1613                 $platform = '';
1614                 $gserver = DBA::selectFirst('gserver', ['platform'], ['nurl' => Strings::normaliseLink($contact['baseurl'])]);
1615                 if (!empty($gserver['platform'])) {
1616                         $platform = strtolower($gserver['platform']);
1617                         Logger::info('Detected platform', ['platform' => $platform, 'url' => $contact['url']]);
1618                 }
1619
1620                 if (!in_array($platform, ['diaspora', 'friendica', 'hubzilla', 'socialhome'])) {
1621                         if (self::isHubzilla($contact['url'])) {
1622                                 Logger::info('Detected unknown platform as Hubzilla', ['platform' => $platform, 'url' => $contact['url']]);
1623                                 $platform = 'hubzilla';
1624                         } elseif ($contact['network'] == Protocol::DFRN) {
1625                                 Logger::info('Detected unknown platform as Friendica', ['platform' => $platform, 'url' => $contact['url']]);
1626                                 $platform = 'friendica';
1627                         }
1628                 }
1629
1630                 if ($platform == 'friendica') {
1631                         return str_replace('/profile/' . $contact['nick'] . '/', '/display/' . $guid, $contact['url'] . '/');
1632                 }
1633
1634                 if ($platform == 'hubzilla') {
1635                         return $contact['baseurl'] . '/item/' . $guid;
1636                 }
1637
1638                 if ($platform == 'socialhome') {
1639                         return $contact['baseurl'] . '/content/' . $guid;
1640                 }
1641
1642                 if ($platform != 'diaspora') {
1643                         Logger::info('Unknown platform', ['platform' => $platform, 'url' => $contact['url']]);
1644                         return '';
1645                 }
1646
1647                 if ($parent_guid != '') {
1648                         return $contact['baseurl'] . '/posts/' . $parent_guid . '#' . $guid;
1649                 } else {
1650                         return $contact['baseurl'] . '/posts/' . $guid;
1651                 }
1652         }
1653
1654         /**
1655          * Receives account migration
1656          *
1657          * @param array  $importer Array of the importer user
1658          * @param object $data     The message object
1659          *
1660          * @return bool Success
1661          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1662          * @throws \ImagickException
1663          */
1664         private static function receiveAccountMigration(array $importer, $data)
1665         {
1666                 $old_handle = Strings::escapeTags(XML::unescape($data->author));
1667                 $new_handle = Strings::escapeTags(XML::unescape($data->profile->author));
1668                 $signature = Strings::escapeTags(XML::unescape($data->signature));
1669
1670                 $contact = self::contactByHandle($importer["uid"], $old_handle);
1671                 if (!$contact) {
1672                         Logger::log("cannot find contact for sender: ".$old_handle." and user ".$importer["uid"]);
1673                         return false;
1674                 }
1675
1676                 Logger::log("Got migration for ".$old_handle.", to ".$new_handle." with user ".$importer["uid"]);
1677
1678                 // Check signature
1679                 $signed_text = 'AccountMigration:'.$old_handle.':'.$new_handle;
1680                 $key = self::key($old_handle);
1681                 if (!Crypto::rsaVerify($signed_text, $signature, $key, "sha256")) {
1682                         Logger::log('No valid signature for migration.');
1683                         return false;
1684                 }
1685
1686                 // Update the profile
1687                 self::receiveProfile($importer, $data->profile);
1688
1689                 // change the technical stuff in contact and gcontact
1690                 $data = Probe::uri($new_handle);
1691                 if ($data['network'] == Protocol::PHANTOM) {
1692                         Logger::log('Account for '.$new_handle." couldn't be probed.");
1693                         return false;
1694                 }
1695
1696                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1697                                 'name' => $data['name'], 'nick' => $data['nick'],
1698                                 'addr' => $data['addr'], 'batch' => $data['batch'],
1699                                 'notify' => $data['notify'], 'poll' => $data['poll'],
1700                                 'network' => $data['network']];
1701
1702                 DBA::update('contact', $fields, ['addr' => $old_handle]);
1703
1704                 $fields = ['url' => $data['url'], 'nurl' => Strings::normaliseLink($data['url']),
1705                                 'name' => $data['name'], 'nick' => $data['nick'],
1706                                 'addr' => $data['addr'], 'connect' => $data['addr'],
1707                                 'notify' => $data['notify'], 'photo' => $data['photo'],
1708                                 'server_url' => $data['baseurl'], 'network' => $data['network']];
1709
1710                 DBA::update('gcontact', $fields, ['addr' => $old_handle]);
1711
1712                 Logger::log('Contacts are updated.');
1713
1714                 return true;
1715         }
1716
1717         /**
1718          * Processes an account deletion
1719          *
1720          * @param object $data The message object
1721          *
1722          * @return bool Success
1723          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1724          */
1725         private static function receiveAccountDeletion($data)
1726         {
1727                 $author = Strings::escapeTags(XML::unescape($data->author));
1728
1729                 $contacts = DBA::select('contact', ['id'], ['addr' => $author]);
1730                 while ($contact = DBA::fetch($contacts)) {
1731                         Contact::remove($contact["id"]);
1732                 }
1733                 DBA::close($contacts);
1734
1735                 DBA::delete('gcontact', ['addr' => $author]);
1736
1737                 Logger::log('Removed contacts for ' . $author);
1738
1739                 return true;
1740         }
1741
1742         /**
1743          * Fetch the uri from our database if we already have this item (maybe from ourselves)
1744          *
1745          * @param string  $author    Author handle
1746          * @param string  $guid      Message guid
1747          * @param boolean $onlyfound Only return uri when found in the database
1748          *
1749          * @return string The constructed uri or the one from our database
1750          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1751          * @throws \ImagickException
1752          */
1753         private static function getUriFromGuid($author, $guid, $onlyfound = false)
1754         {
1755                 $item = Item::selectFirst(['uri'], ['guid' => $guid]);
1756                 if (DBA::isResult($item)) {
1757                         return $item["uri"];
1758                 } elseif (!$onlyfound) {
1759                         $person = self::personByHandle($author);
1760
1761                         $parts = parse_url($person['url']);
1762                         unset($parts['path']);
1763                         $host_url = Network::unparseURL($parts);
1764
1765                         return $host_url . '/objects/' . $guid;
1766                 }
1767
1768                 return "";
1769         }
1770
1771         /**
1772          * Fetch the guid from our database with a given uri
1773          *
1774          * @param string $uri Message uri
1775          * @param string $uid Author handle
1776          *
1777          * @return string The post guid
1778          * @throws \Exception
1779          */
1780         private static function getGuidFromUri($uri, $uid)
1781         {
1782                 $item = Item::selectFirst(['guid'], ['uri' => $uri, 'uid' => $uid]);
1783                 if (DBA::isResult($item)) {
1784                         return $item["guid"];
1785                 } else {
1786                         return false;
1787                 }
1788         }
1789
1790         /**
1791          * Find the best importer for a comment, like, ...
1792          *
1793          * @param string $guid The guid of the item
1794          *
1795          * @return array|boolean the origin owner of that post - or false
1796          * @throws \Exception
1797          */
1798         private static function importerForGuid($guid)
1799         {
1800                 $item = Item::selectFirst(['uid'], ['origin' => true, 'guid' => $guid]);
1801                 if (DBA::isResult($item)) {
1802                         Logger::log("Found user ".$item['uid']." as owner of item ".$guid, Logger::DEBUG);
1803                         $contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $item['uid']]);
1804                         if (DBA::isResult($contact)) {
1805                                 return $contact;
1806                         }
1807                 }
1808                 return false;
1809         }
1810
1811         /**
1812          * Store the mentions in the tag table
1813          *
1814          * @param integer $uriid
1815          * @param string $text
1816          */
1817         private static function storeMentions(int $uriid, string $text)
1818         {
1819                 preg_match_all('/([@!]){(?:([^}]+?); ?)?([^} ]+)}/', $text, $matches, PREG_SET_ORDER);
1820                 if (empty($matches)) {
1821                         return;
1822                 }
1823
1824                 /*
1825                  * Matching values for the preg match
1826                  * [1] = mention type (@ or !)
1827                  * [2] = name (optional)
1828                  * [3] = profile URL
1829                  */
1830
1831                 foreach ($matches as $match) {
1832                         if (empty($match)) {
1833                                 continue;
1834                         }
1835
1836                         $person = self::personByHandle($match[3]);
1837                         if (empty($person)) {
1838                                 continue;
1839                         }
1840
1841                         Tag::storeByHash($uriid, $match[1], $person['name'] ?: $person['nick'], $person['url']);
1842                 }
1843         }
1844
1845         /**
1846          * Processes an incoming comment
1847          *
1848          * @param array  $importer Array of the importer user
1849          * @param string $sender   The sender of the message
1850          * @param object $data     The message object
1851          * @param string $xml      The original XML of the message
1852          *
1853          * @return int The message id of the generated comment or "false" if there was an error
1854          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1855          * @throws \ImagickException
1856          */
1857         private static function receiveComment(array $importer, $sender, $data, $xml)
1858         {
1859                 $author = Strings::escapeTags(XML::unescape($data->author));
1860                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1861                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
1862                 $text = XML::unescape($data->text);
1863
1864                 if (isset($data->created_at)) {
1865                         $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
1866                 } else {
1867                         $created_at = DateTimeFormat::utcNow();
1868                 }
1869
1870                 if (isset($data->thread_parent_guid)) {
1871                         $thread_parent_guid = Strings::escapeTags(XML::unescape($data->thread_parent_guid));
1872                         $thr_uri = self::getUriFromGuid("", $thread_parent_guid, true);
1873                 } else {
1874                         $thr_uri = "";
1875                 }
1876
1877                 $contact = self::allowedContactByHandle($importer, $sender, true);
1878                 if (!$contact) {
1879                         return false;
1880                 }
1881
1882                 $message_id = self::messageExists($importer["uid"], $guid);
1883                 if ($message_id) {
1884                         return true;
1885                 }
1886
1887                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
1888                 if (!$parent_item) {
1889                         return false;
1890                 }
1891
1892                 $person = self::personByHandle($author);
1893                 if (!is_array($person)) {
1894                         Logger::log("unable to find author details");
1895                         return false;
1896                 }
1897
1898                 // Fetch the contact id - if we know this contact
1899                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
1900
1901                 $datarray = [];
1902
1903                 $datarray["uid"] = $importer["uid"];
1904                 $datarray["contact-id"] = $author_contact["cid"];
1905                 $datarray["network"]  = $author_contact["network"];
1906
1907                 $datarray["author-link"] = $person["url"];
1908                 $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
1909
1910                 $datarray["owner-link"] = $contact["url"];
1911                 $datarray["owner-id"] = Contact::getIdForURL($contact["url"], 0);
1912
1913                 $datarray["guid"] = $guid;
1914                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
1915                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
1916
1917                 $datarray["verb"] = Activity::POST;
1918                 $datarray["gravity"] = GRAVITY_COMMENT;
1919
1920                 if ($thr_uri != "") {
1921                         $datarray["parent-uri"] = $thr_uri;
1922                 } else {
1923                         $datarray["parent-uri"] = $parent_item["uri"];
1924                 }
1925
1926                 $datarray["object-type"] = Activity\ObjectType::COMMENT;
1927
1928                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
1929                 $datarray["source"] = $xml;
1930
1931                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
1932
1933                 $datarray["plink"] = self::plink($author, $guid, $parent_item['guid']);
1934                 $body = Markdown::toBBCode($text);
1935
1936                 $datarray["body"] = self::replacePeopleGuid($body, $person["url"]);
1937
1938                 self::storeMentions($datarray['uri-id'], $text);
1939                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
1940
1941                 self::fetchGuid($datarray);
1942
1943                 // If we are the origin of the parent we store the original data.
1944                 // We notify our followers during the item storage.
1945                 if ($parent_item["origin"]) {
1946                         $datarray['diaspora_signed_text'] = json_encode($data);
1947                 }
1948
1949                 $message_id = Item::insert($datarray);
1950
1951                 if ($message_id <= 0) {
1952                         return false;
1953                 }
1954
1955                 if ($message_id) {
1956                         Logger::log("Stored comment ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
1957                         if ($datarray['uid'] == 0) {
1958                                 Item::distribute($message_id, json_encode($data));
1959                         }
1960                 }
1961
1962                 return true;
1963         }
1964
1965         /**
1966          * processes and stores private messages
1967          *
1968          * @param array  $importer     Array of the importer user
1969          * @param array  $contact      The contact of the message
1970          * @param object $data         The message object
1971          * @param array  $msg          Array of the processed message, author handle and key
1972          * @param object $mesg         The private message
1973          * @param array  $conversation The conversation record to which this message belongs
1974          *
1975          * @return bool "true" if it was successful
1976          * @throws \Exception
1977          */
1978         private static function receiveConversationMessage(array $importer, array $contact, $data, $msg, $mesg, $conversation)
1979         {
1980                 $author = Strings::escapeTags(XML::unescape($data->author));
1981                 $guid = Strings::escapeTags(XML::unescape($data->guid));
1982                 $subject = Strings::escapeTags(XML::unescape($data->subject));
1983
1984                 // "diaspora_handle" is the element name from the old version
1985                 // "author" is the element name from the new version
1986                 if ($mesg->author) {
1987                         $msg_author = Strings::escapeTags(XML::unescape($mesg->author));
1988                 } elseif ($mesg->diaspora_handle) {
1989                         $msg_author = Strings::escapeTags(XML::unescape($mesg->diaspora_handle));
1990                 } else {
1991                         return false;
1992                 }
1993
1994                 $msg_guid = Strings::escapeTags(XML::unescape($mesg->guid));
1995                 $msg_conversation_guid = Strings::escapeTags(XML::unescape($mesg->conversation_guid));
1996                 $msg_text = XML::unescape($mesg->text);
1997                 $msg_created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($mesg->created_at)));
1998
1999                 if ($msg_conversation_guid != $guid) {
2000                         Logger::log("message conversation guid does not belong to the current conversation.");
2001                         return false;
2002                 }
2003
2004                 $body = Markdown::toBBCode($msg_text);
2005                 $message_uri = $msg_author.":".$msg_guid;
2006
2007                 $person = self::personByHandle($msg_author);
2008
2009                 return Mail::insert([
2010                         'uid'        => $importer['uid'],
2011                         'guid'       => $msg_guid,
2012                         'convid'     => $conversation['id'],
2013                         'from-name'  => $person['name'],
2014                         'from-photo' => $person['photo'],
2015                         'from-url'   => $person['url'],
2016                         'contact-id' => $contact['id'],
2017                         'title'      => $subject,
2018                         'body'       => $body,
2019                         'uri'        => $message_uri,
2020                         'parent-uri' => $author . ':' . $guid,
2021                         'created'    => $msg_created_at
2022                 ]);
2023         }
2024
2025         /**
2026          * Processes new private messages (answers to private messages are processed elsewhere)
2027          *
2028          * @param array  $importer Array of the importer user
2029          * @param array  $msg      Array of the processed message, author handle and key
2030          * @param object $data     The message object
2031          *
2032          * @return bool Success
2033          * @throws \Exception
2034          */
2035         private static function receiveConversation(array $importer, $msg, $data)
2036         {
2037                 $author = Strings::escapeTags(XML::unescape($data->author));
2038                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2039                 $subject = Strings::escapeTags(XML::unescape($data->subject));
2040                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2041                 $participants = Strings::escapeTags(XML::unescape($data->participants));
2042
2043                 $messages = $data->message;
2044
2045                 if (!count($messages)) {
2046                         Logger::log("empty conversation");
2047                         return false;
2048                 }
2049
2050                 $contact = self::allowedContactByHandle($importer, $msg["author"], true);
2051                 if (!$contact) {
2052                         return false;
2053                 }
2054
2055                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
2056                 if (!DBA::isResult($conversation)) {
2057                         $r = q(
2058                                 "INSERT INTO `conv` (`uid`, `guid`, `creator`, `created`, `updated`, `subject`, `recips`)
2059                                 VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s')",
2060                                 intval($importer["uid"]),
2061                                 DBA::escape($guid),
2062                                 DBA::escape($author),
2063                                 DBA::escape($created_at),
2064                                 DBA::escape(DateTimeFormat::utcNow()),
2065                                 DBA::escape($subject),
2066                                 DBA::escape($participants)
2067                         );
2068                         if ($r) {
2069                                 $conversation = DBA::selectFirst('conv', [], ['uid' => $importer["uid"], 'guid' => $guid]);
2070                         }
2071                 }
2072                 if (!$conversation) {
2073                         Logger::log("unable to create conversation.");
2074                         return false;
2075                 }
2076
2077                 foreach ($messages as $mesg) {
2078                         self::receiveConversationMessage($importer, $contact, $data, $msg, $mesg, $conversation);
2079                 }
2080
2081                 return true;
2082         }
2083
2084         /**
2085          * Processes "like" messages
2086          *
2087          * @param array  $importer Array of the importer user
2088          * @param string $sender   The sender of the message
2089          * @param object $data     The message object
2090          *
2091          * @return int The message id of the generated like or "false" if there was an error
2092          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2093          * @throws \ImagickException
2094          */
2095         private static function receiveLike(array $importer, $sender, $data)
2096         {
2097                 $author = Strings::escapeTags(XML::unescape($data->author));
2098                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2099                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2100                 $parent_type = Strings::escapeTags(XML::unescape($data->parent_type));
2101                 $positive = Strings::escapeTags(XML::unescape($data->positive));
2102
2103                 // likes on comments aren't supported by Diaspora - only on posts
2104                 // But maybe this will be supported in the future, so we will accept it.
2105                 if (!in_array($parent_type, ["Post", "Comment"])) {
2106                         return false;
2107                 }
2108
2109                 $contact = self::allowedContactByHandle($importer, $sender, true);
2110                 if (!$contact) {
2111                         return false;
2112                 }
2113
2114                 $message_id = self::messageExists($importer["uid"], $guid);
2115                 if ($message_id) {
2116                         return true;
2117                 }
2118
2119                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
2120                 if (!$parent_item) {
2121                         return false;
2122                 }
2123
2124                 $person = self::personByHandle($author);
2125                 if (!is_array($person)) {
2126                         Logger::log("unable to find author details");
2127                         return false;
2128                 }
2129
2130                 // Fetch the contact id - if we know this contact
2131                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2132
2133                 // "positive" = "false" would be a Dislike - wich isn't currently supported by Diaspora
2134                 // We would accept this anyhow.
2135                 if ($positive == "true") {
2136                         $verb = Activity::LIKE;
2137                 } else {
2138                         $verb = Activity::DISLIKE;
2139                 }
2140
2141                 $datarray = [];
2142
2143                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2144
2145                 $datarray["uid"] = $importer["uid"];
2146                 $datarray["contact-id"] = $author_contact["cid"];
2147                 $datarray["network"]  = $author_contact["network"];
2148
2149                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
2150                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
2151
2152                 $datarray["guid"] = $guid;
2153                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2154
2155                 $datarray["verb"] = $verb;
2156                 $datarray["gravity"] = GRAVITY_ACTIVITY;
2157                 $datarray["parent-uri"] = $parent_item["uri"];
2158
2159                 $datarray["object-type"] = Activity\ObjectType::NOTE;
2160
2161                 $datarray["body"] = $verb;
2162
2163                 // Diaspora doesn't provide a date for likes
2164                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
2165
2166                 // like on comments have the comment as parent. So we need to fetch the toplevel parent
2167                 if ($parent_item['gravity'] != GRAVITY_PARENT) {
2168                         $toplevel = Item::selectFirst(['origin'], ['id' => $parent_item['parent']]);
2169                         $origin = $toplevel["origin"];
2170                 } else {
2171                         $origin = $parent_item["origin"];
2172                 }
2173
2174                 // If we are the origin of the parent we store the original data.
2175                 // We notify our followers during the item storage.
2176                 if ($origin) {
2177                         $datarray['diaspora_signed_text'] = json_encode($data);
2178                 }
2179
2180                 $message_id = Item::insert($datarray);
2181
2182                 if ($message_id <= 0) {
2183                         return false;
2184                 }
2185
2186                 if ($message_id) {
2187                         Logger::log("Stored like ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2188                         if ($datarray['uid'] == 0) {
2189                                 Item::distribute($message_id, json_encode($data));
2190                         }
2191                 }
2192
2193                 return true;
2194         }
2195
2196         /**
2197          * Processes private messages
2198          *
2199          * @param array  $importer Array of the importer user
2200          * @param object $data     The message object
2201          *
2202          * @return bool Success?
2203          * @throws \Exception
2204          */
2205         private static function receiveMessage(array $importer, $data)
2206         {
2207                 $author = Strings::escapeTags(XML::unescape($data->author));
2208                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2209                 $conversation_guid = Strings::escapeTags(XML::unescape($data->conversation_guid));
2210                 $text = XML::unescape($data->text);
2211                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2212
2213                 $contact = self::allowedContactByHandle($importer, $author, true);
2214                 if (!$contact) {
2215                         return false;
2216                 }
2217
2218                 $conversation = null;
2219
2220                 $condition = ['uid' => $importer["uid"], 'guid' => $conversation_guid];
2221                 $conversation = DBA::selectFirst('conv', [], $condition);
2222
2223                 if (!DBA::isResult($conversation)) {
2224                         Logger::log("conversation not available.");
2225                         return false;
2226                 }
2227
2228                 $message_uri = $author.":".$guid;
2229
2230                 $person = self::personByHandle($author);
2231                 if (!$person) {
2232                         Logger::log("unable to find author details");
2233                         return false;
2234                 }
2235
2236                 $body = Markdown::toBBCode($text);
2237
2238                 $body = self::replacePeopleGuid($body, $person["url"]);
2239
2240                 return Mail::insert([
2241                         'uid'        => $importer['uid'],
2242                         'guid'       => $guid,
2243                         'convid'     => $conversation['id'],
2244                         'from-name'  => $person['name'],
2245                         'from-photo' => $person['photo'],
2246                         'from-url'   => $person['url'],
2247                         'contact-id' => $contact['id'],
2248                         'title'      => $conversation['subject'],
2249                         'body'       => $body,
2250                         'reply'      => 1,
2251                         'uri'        => $message_uri,
2252                         'parent-uri' => $author.":".$conversation['guid'],
2253                         'created'    => $created_at
2254                 ]);
2255         }
2256
2257         /**
2258          * Processes participations - unsupported by now
2259          *
2260          * @param array  $importer Array of the importer user
2261          * @param object $data     The message object
2262          *
2263          * @return bool success
2264          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2265          * @throws \ImagickException
2266          */
2267         private static function receiveParticipation(array $importer, $data)
2268         {
2269                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2270                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2271                 $parent_guid = Strings::escapeTags(XML::unescape($data->parent_guid));
2272
2273                 $contact = self::allowedContactByHandle($importer, $author, true);
2274                 if (!$contact) {
2275                         return false;
2276                 }
2277
2278                 if (self::messageExists($importer["uid"], $guid)) {
2279                         return true;
2280                 }
2281
2282                 $parent_item = self::parentItem($importer["uid"], $parent_guid, $author, $contact);
2283                 if (!$parent_item) {
2284                         return false;
2285                 }
2286
2287                 if (!$parent_item['origin']) {
2288                         Logger::info('Not our origin. Participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
2289                 }
2290
2291                 if (!in_array($parent_item['private'], [Item::PUBLIC, Item::UNLISTED])) {
2292                         Logger::info('Item is not public, participation is ignored', ['parent_guid' => $parent_guid, 'guid' => $guid, 'author' => $author]);
2293                         return false;
2294                 }
2295
2296                 $person = self::personByHandle($author);
2297                 if (!is_array($person)) {
2298                         Logger::log("Person not found: ".$author);
2299                         return false;
2300                 }
2301
2302                 $author_contact = self::authorContactByUrl($contact, $person, $importer["uid"]);
2303
2304                 // Store participation
2305                 $datarray = [];
2306
2307                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2308
2309                 $datarray["uid"] = $importer["uid"];
2310                 $datarray["contact-id"] = $author_contact["cid"];
2311                 $datarray["network"]  = $author_contact["network"];
2312
2313                 $datarray["owner-link"] = $datarray["author-link"] = $person["url"];
2314                 $datarray["owner-id"] = $datarray["author-id"] = Contact::getIdForURL($person["url"], 0);
2315
2316                 $datarray["guid"] = $guid;
2317                 $datarray["uri"] = self::getUriFromGuid($author, $guid);
2318
2319                 $datarray["verb"] = Activity::FOLLOW;
2320                 $datarray["gravity"] = GRAVITY_ACTIVITY;
2321                 $datarray["parent-uri"] = $parent_item["uri"];
2322
2323                 $datarray["object-type"] = Activity\ObjectType::NOTE;
2324
2325                 $datarray["body"] = Activity::FOLLOW;
2326
2327                 // Diaspora doesn't provide a date for a participation
2328                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = DateTimeFormat::utcNow();
2329
2330                 $message_id = Item::insert($datarray);
2331
2332                 Logger::info('Participation stored', ['id' => $message_id, 'guid' => $guid, 'parent_guid' => $parent_guid, 'author' => $author]);
2333
2334                 // Send all existing comments and likes to the requesting server
2335                 $comments = Item::select(['id', 'uri-id', 'parent-author-network', 'author-network', 'verb'],
2336                         ['parent' => $parent_item['id'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
2337                 while ($comment = Item::fetch($comments)) {
2338                         if (in_array($comment['verb'], [Activity::FOLLOW, Activity::TAG])) {
2339                                 Logger::info('participation messages are not relayed', ['item' => $comment['id']]);
2340                                 continue;
2341                         }
2342
2343                         if ($comment['author-network'] == Protocol::ACTIVITYPUB) {
2344                                 Logger::info('Comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
2345                                 continue;
2346                         }
2347
2348                         if ($comment['parent-author-network'] == Protocol::ACTIVITYPUB) {
2349                                 Logger::info('Comments to comments from ActivityPub authors are not relayed', ['item' => $comment['id']]);
2350                                 continue;
2351                         }
2352
2353                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $author_contact["cid"]]);
2354                         if (Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $author_contact["cid"])) {
2355                                 Post\DeliveryData::incrementQueueCount($comment['uri-id'], 1);
2356                         }
2357                 }
2358                 DBA::close($comments);
2359
2360                 return true;
2361         }
2362
2363         /**
2364          * Processes photos - unneeded
2365          *
2366          * @param array  $importer Array of the importer user
2367          * @param object $data     The message object
2368          *
2369          * @return bool always true
2370          */
2371         private static function receivePhoto(array $importer, $data)
2372         {
2373                 // There doesn't seem to be a reason for this function,
2374                 // since the photo data is transmitted in the status message as well
2375                 return true;
2376         }
2377
2378         /**
2379          * Processes poll participations - unssupported
2380          *
2381          * @param array  $importer Array of the importer user
2382          * @param object $data     The message object
2383          *
2384          * @return bool always true
2385          */
2386         private static function receivePollParticipation(array $importer, $data)
2387         {
2388                 // We don't support polls by now
2389                 return true;
2390         }
2391
2392         /**
2393          * Processes incoming profile updates
2394          *
2395          * @param array  $importer Array of the importer user
2396          * @param object $data     The message object
2397          *
2398          * @return bool Success
2399          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2400          * @throws \ImagickException
2401          */
2402         private static function receiveProfile(array $importer, $data)
2403         {
2404                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2405
2406                 $contact = self::contactByHandle($importer["uid"], $author);
2407                 if (!$contact) {
2408                         return false;
2409                 }
2410
2411                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2412                 $image_url = XML::unescape($data->image_url);
2413                 $birthday = XML::unescape($data->birthday);
2414                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2415                 $location = Markdown::toBBCode(XML::unescape($data->location));
2416                 $searchable = (XML::unescape($data->searchable) == "true");
2417                 $nsfw = (XML::unescape($data->nsfw) == "true");
2418                 $tags = XML::unescape($data->tag_string);
2419
2420                 $tags = explode("#", $tags);
2421
2422                 $keywords = [];
2423                 foreach ($tags as $tag) {
2424                         $tag = trim(strtolower($tag));
2425                         if ($tag != "") {
2426                                 $keywords[] = $tag;
2427                         }
2428                 }
2429
2430                 $keywords = implode(", ", $keywords);
2431
2432                 $handle_parts = explode("@", $author);
2433                 $nick = $handle_parts[0];
2434
2435                 if ($name === "") {
2436                         $name = $handle_parts[0];
2437                 }
2438
2439                 if (preg_match("|^https?://|", $image_url) === 0) {
2440                         $image_url = "http://".$handle_parts[1].$image_url;
2441                 }
2442
2443                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2444
2445                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2446
2447                 $birthday = str_replace("1000", "1901", $birthday);
2448
2449                 if ($birthday != "") {
2450                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2451                 }
2452
2453                 // this is to prevent multiple birthday notifications in a single year
2454                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2455
2456                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2457                         $birthday = $contact["bd"];
2458                 }
2459
2460                 $fields = ['name' => $name, 'location' => $location,
2461                         'name-date' => DateTimeFormat::utcNow(), 'about' => $about,
2462                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2463                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2464
2465                 if (!empty($birthday)) {
2466                         $fields['bd'] = $birthday;
2467                 }
2468
2469                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2470
2471                 // @todo Update the public contact, then update the gcontact from that
2472
2473                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2474                                         "photo" => $image_url, "name" => $name, "location" => $location,
2475                                         "about" => $about, "birthday" => $birthday,
2476                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2477                                         "hide" => !$searchable, "nsfw" => $nsfw];
2478
2479                 $gcid = GContact::update($gcontact);
2480
2481                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2482
2483                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2484
2485                 return true;
2486         }
2487
2488         /**
2489          * Processes incoming friend requests
2490          *
2491          * @param array $importer Array of the importer user
2492          * @param array $contact  The contact that send the request
2493          * @return void
2494          * @throws \Exception
2495          */
2496         private static function receiveRequestMakeFriend(array $importer, array $contact)
2497         {
2498                 if ($contact["rel"] == Contact::SHARING) {
2499                         DBA::update(
2500                                 'contact',
2501                                 ['rel' => Contact::FRIEND, 'writable' => true],
2502                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2503                         );
2504                 }
2505         }
2506
2507         /**
2508          * Processes incoming sharing notification
2509          *
2510          * @param array  $importer Array of the importer user
2511          * @param object $data     The message object
2512          *
2513          * @return bool Success
2514          * @throws \Exception
2515          */
2516         private static function receiveContactRequest(array $importer, $data)
2517         {
2518                 $author = XML::unescape($data->author);
2519                 $recipient = XML::unescape($data->recipient);
2520
2521                 if (!$author || !$recipient) {
2522                         return false;
2523                 }
2524
2525                 // the current protocol version doesn't know these fields
2526                 // That means that we will assume their existance
2527                 if (isset($data->following)) {
2528                         $following = (XML::unescape($data->following) == "true");
2529                 } else {
2530                         $following = true;
2531                 }
2532
2533                 if (isset($data->sharing)) {
2534                         $sharing = (XML::unescape($data->sharing) == "true");
2535                 } else {
2536                         $sharing = true;
2537                 }
2538
2539                 $contact = self::contactByHandle($importer["uid"], $author);
2540
2541                 // perhaps we were already sharing with this person. Now they're sharing with us.
2542                 // That makes us friends.
2543                 if ($contact) {
2544                         if ($following) {
2545                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2546                                 self::receiveRequestMakeFriend($importer, $contact);
2547
2548                                 // refetch the contact array
2549                                 $contact = self::contactByHandle($importer["uid"], $author);
2550
2551                                 // If we are now friends, we are sending a share message.
2552                                 // Normally we needn't to do so, but the first message could have been vanished.
2553                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2554                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2555                                         if (DBA::isResult($user)) {
2556                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2557                                                 self::sendShare($user, $contact);
2558                                         }
2559                                 }
2560                                 return true;
2561                         } else {
2562                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2563                                 Contact::removeFollower($importer, $contact);
2564                                 return true;
2565                         }
2566                 }
2567
2568                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2569                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2570                         return false;
2571                 } elseif (!$following && !$sharing) {
2572                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2573                         return false;
2574                 } elseif (!$following && $sharing) {
2575                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2576                 } elseif ($following && $sharing) {
2577                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2578                 } elseif ($following && !$sharing) {
2579                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2580                 }
2581
2582                 $ret = self::personByHandle($author);
2583
2584                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2585                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2586                         return false;
2587                 }
2588
2589                 $cid = Contact::getIdForURL($ret['url'], $importer['uid']);
2590                 if (!empty($cid)) {
2591                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
2592                 } else {
2593                         $contact = [];
2594                 }
2595
2596                 $item = ['author-id' => Contact::getIdForURL($ret['url']),
2597                         'author-link' => $ret['url']];
2598
2599                 $result = Contact::addRelationship($importer, $contact, $item, false);
2600                 if ($result === true) {
2601                         $contact_record = self::contactByHandle($importer['uid'], $author);
2602                         if (!$contact_record) {
2603                                 Logger::info('unable to locate newly created contact record.');
2604                                 return;
2605                         }
2606
2607                         $user = DBA::selectFirst('user', [], ['uid' => $importer['uid']]);
2608                         if (DBA::isResult($user)) {
2609                                 self::sendShare($user, $contact_record);
2610
2611                                 // Send the profile data, maybe it weren't transmitted before
2612                                 self::sendProfile($importer['uid'], [$contact_record]);
2613                         }
2614                 }
2615
2616                 return true;
2617         }
2618
2619         /**
2620          * Fetches a message with a given guid
2621          *
2622          * @param string $guid        message guid
2623          * @param string $orig_author handle of the original post
2624          * @return array The fetched item
2625          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2626          * @throws \ImagickException
2627          */
2628         public static function originalItem($guid, $orig_author)
2629         {
2630                 if (empty($guid)) {
2631                         Logger::log('Empty guid. Quitting.');
2632                         return false;
2633                 }
2634
2635                 // Do we already have this item?
2636                 $fields = ['body', 'title', 'attach', 'app', 'created', 'object-type', 'uri', 'guid',
2637                         'author-name', 'author-link', 'author-avatar'];
2638                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2639                 $item = Item::selectFirst($fields, $condition);
2640
2641                 if (DBA::isResult($item)) {
2642                         Logger::log("reshared message ".$guid." already exists on system.");
2643
2644                         // Maybe it is already a reshared item?
2645                         // Then refetch the content, if it is a reshare from a reshare.
2646                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2647                         if (self::isReshare($item["body"], true)) {
2648                                 $item = [];
2649                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2650                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2651
2652                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2653
2654                                 // Add OEmbed and other information to the body
2655                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2656
2657                                 return $item;
2658                         } else {
2659                                 return $item;
2660                         }
2661                 }
2662
2663                 if (!DBA::isResult($item)) {
2664                         if (empty($orig_author)) {
2665                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2666                                 return false;
2667                         }
2668
2669                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2670                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2671                         $stored = self::storeByGuid($guid, $server);
2672
2673                         if (!$stored) {
2674                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2675                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2676                                 $stored = self::storeByGuid($guid, $server);
2677                         }
2678
2679                         if ($stored) {
2680                                 $fields = ['body', 'title', 'attach', 'app', 'created', 'object-type', 'uri', 'guid',
2681                                         'author-name', 'author-link', 'author-avatar'];
2682                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2683                                 $item = Item::selectFirst($fields, $condition);
2684
2685                                 if (DBA::isResult($item)) {
2686                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2687                                         if (self::isReshare($item["body"], false)) {
2688                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2689                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2690                                         }
2691
2692                                         return $item;
2693                                 }
2694                         }
2695                 }
2696                 return false;
2697         }
2698
2699         /**
2700          * Stores a reshare activity
2701          *
2702          * @param array   $item              Array of reshare post
2703          * @param integer $parent_message_id Id of the parent post
2704          * @param string  $guid              GUID string of reshare action
2705          * @param string  $author            Author handle
2706          */
2707         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2708         {
2709                 $parent = Item::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2710
2711                 $datarray = [];
2712
2713                 $datarray['uid'] = $item['uid'];
2714                 $datarray['contact-id'] = $item['contact-id'];
2715                 $datarray['network'] = $item['network'];
2716
2717                 $datarray['author-link'] = $item['author-link'];
2718                 $datarray['author-id'] = $item['author-id'];
2719
2720                 $datarray['owner-link'] = $datarray['author-link'];
2721                 $datarray['owner-id'] = $datarray['author-id'];
2722
2723                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2724                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2725                 $datarray['parent-uri'] = $parent['uri'];
2726
2727                 $datarray['verb'] = $datarray['body'] = Activity::ANNOUNCE;
2728                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2729                 $datarray['object-type'] = Activity\ObjectType::NOTE;
2730
2731                 $datarray['protocol'] = $item['protocol'];
2732
2733                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2734                 $datarray['private'] = $item['private'];
2735                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2736
2737                 $message_id = Item::insert($datarray);
2738
2739                 if ($message_id) {
2740                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2741                         if ($datarray['uid'] == 0) {
2742                                 Item::distribute($message_id);
2743                         }
2744                 }
2745         }
2746
2747         /**
2748          * Processes a reshare message
2749          *
2750          * @param array  $importer Array of the importer user
2751          * @param object $data     The message object
2752          * @param string $xml      The original XML of the message
2753          *
2754          * @return int the message id
2755          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2756          * @throws \ImagickException
2757          */
2758         private static function receiveReshare(array $importer, $data, $xml)
2759         {
2760                 $author = Strings::escapeTags(XML::unescape($data->author));
2761                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2762                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2763                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2764                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2765                 /// @todo handle unprocessed property "provider_display_name"
2766                 $public = Strings::escapeTags(XML::unescape($data->public));
2767
2768                 $contact = self::allowedContactByHandle($importer, $author, false);
2769                 if (!$contact) {
2770                         return false;
2771                 }
2772
2773                 $message_id = self::messageExists($importer["uid"], $guid);
2774                 if ($message_id) {
2775                         return true;
2776                 }
2777
2778                 $original_item = self::originalItem($root_guid, $root_author);
2779                 if (!$original_item) {
2780                         return false;
2781                 }
2782
2783                 $orig_url = DI::baseUrl()."/display/".$original_item["guid"];
2784
2785                 $datarray = [];
2786
2787                 $datarray["uid"] = $importer["uid"];
2788                 $datarray["contact-id"] = $contact["id"];
2789                 $datarray["network"]  = Protocol::DIASPORA;
2790
2791                 $datarray["author-link"] = $contact["url"];
2792                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2793
2794                 $datarray["owner-link"] = $datarray["author-link"];
2795                 $datarray["owner-id"] = $datarray["author-id"];
2796
2797                 $datarray["guid"] = $guid;
2798                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2799                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2800
2801                 $datarray["verb"] = Activity::POST;
2802                 $datarray["gravity"] = GRAVITY_PARENT;
2803
2804                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2805                 $datarray["source"] = $xml;
2806
2807                 /// @todo Copy tag data from original post
2808
2809                 $prefix = BBCode::getShareOpeningTag(
2810                         $original_item["author-name"],
2811                         $original_item["author-link"],
2812                         $original_item["author-avatar"],
2813                         $orig_url,
2814                         $original_item["created"],
2815                         $original_item["guid"]
2816                 );
2817
2818                 if (!empty($original_item['title'])) {
2819                         $prefix .= '[h3]' . $original_item['title'] . "[/h3]\n";
2820                 }
2821
2822                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2823
2824                 Tag::storeFromBody($datarray['uri-id'], $datarray["body"]);
2825
2826                 $datarray["attach"] = $original_item["attach"];
2827                 $datarray["app"]  = $original_item["app"];
2828
2829                 $datarray["plink"] = self::plink($author, $guid);
2830                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2831                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2832
2833                 $datarray["object-type"] = $original_item["object-type"];
2834
2835                 self::fetchGuid($datarray);
2836                 $message_id = Item::insert($datarray);
2837
2838                 self::sendParticipation($contact, $datarray);
2839
2840                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2841                 if ($root_message_id) {
2842                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2843                 }
2844
2845                 if ($message_id) {
2846                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2847                         if ($datarray['uid'] == 0) {
2848                                 Item::distribute($message_id);
2849                         }
2850                         return true;
2851                 } else {
2852                         return false;
2853                 }
2854         }
2855
2856         /**
2857          * Processes retractions
2858          *
2859          * @param array  $importer Array of the importer user
2860          * @param array  $contact  The contact of the item owner
2861          * @param object $data     The message object
2862          *
2863          * @return bool success
2864          * @throws \Exception
2865          */
2866         private static function itemRetraction(array $importer, array $contact, $data)
2867         {
2868                 $author = Strings::escapeTags(XML::unescape($data->author));
2869                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2870                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2871
2872                 $person = self::personByHandle($author);
2873                 if (!is_array($person)) {
2874                         Logger::log("unable to find author detail for ".$author);
2875                         return false;
2876                 }
2877
2878                 if (empty($contact["url"])) {
2879                         $contact["url"] = $person["url"];
2880                 }
2881
2882                 // Fetch items that are about to be deleted
2883                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2884
2885                 // When we receive a public retraction, we delete every item that we find.
2886                 if ($importer['uid'] == 0) {
2887                         $condition = ['guid' => $target_guid, 'deleted' => false];
2888                 } else {
2889                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2890                 }
2891
2892                 $r = Item::select($fields, $condition);
2893                 if (!DBA::isResult($r)) {
2894                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2895                         return false;
2896                 }
2897
2898                 while ($item = Item::fetch($r)) {
2899                         if (strstr($item['file'], '[')) {
2900                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2901                                 continue;
2902                         }
2903
2904                         // Fetch the parent item
2905                         $parent = Item::selectFirst(['author-link'], ['id' => $item['parent']]);
2906
2907                         // Only delete it if the parent author really fits
2908                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2909                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2910                                 continue;
2911                         }
2912
2913                         Item::markForDeletion(['id' => $item['id']]);
2914
2915                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item['parent'], Logger::DEBUG);
2916                 }
2917
2918                 return true;
2919         }
2920
2921         /**
2922          * Receives retraction messages
2923          *
2924          * @param array  $importer Array of the importer user
2925          * @param string $sender   The sender of the message
2926          * @param object $data     The message object
2927          *
2928          * @return bool Success
2929          * @throws \Exception
2930          */
2931         private static function receiveRetraction(array $importer, $sender, $data)
2932         {
2933                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2934
2935                 $contact = self::contactByHandle($importer["uid"], $sender);
2936                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2937                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2938                         return false;
2939                 }
2940
2941                 if (!$contact) {
2942                         $contact = [];
2943                 }
2944
2945                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2946
2947                 switch ($target_type) {
2948                         case "Comment":
2949                         case "Like":
2950                         case "Post":
2951                         case "Reshare":
2952                         case "StatusMessage":
2953                                 return self::itemRetraction($importer, $contact, $data);
2954
2955                         case "PollParticipation":
2956                         case "Photo":
2957                                 // Currently unsupported
2958                                 break;
2959
2960                         default:
2961                                 Logger::log("Unknown target type ".$target_type);
2962                                 return false;
2963                 }
2964                 return true;
2965         }
2966
2967         /**
2968          * Receives status messages
2969          *
2970          * @param array            $importer Array of the importer user
2971          * @param SimpleXMLElement $data     The message object
2972          * @param string           $xml      The original XML of the message
2973          *
2974          * @return int The message id of the newly created item
2975          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2976          * @throws \ImagickException
2977          */
2978         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2979         {
2980                 $author = Strings::escapeTags(XML::unescape($data->author));
2981                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2982                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2983                 $public = Strings::escapeTags(XML::unescape($data->public));
2984                 $text = XML::unescape($data->text);
2985                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2986
2987                 $contact = self::allowedContactByHandle($importer, $author, false);
2988                 if (!$contact) {
2989                         return false;
2990                 }
2991
2992                 $message_id = self::messageExists($importer["uid"], $guid);
2993                 if ($message_id) {
2994                         return true;
2995                 }
2996
2997                 $address = [];
2998                 if ($data->location) {
2999                         foreach ($data->location->children() as $fieldname => $data) {
3000                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
3001                         }
3002                 }
3003
3004                 $body = Markdown::toBBCode($text);
3005
3006                 $datarray = [];
3007
3008                 // Attach embedded pictures to the body
3009                 if ($data->photo) {
3010                         foreach ($data->photo as $photo) {
3011                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
3012                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
3013                         }
3014
3015                         $datarray["object-type"] = Activity\ObjectType::IMAGE;
3016                 } else {
3017                         $datarray["object-type"] = Activity\ObjectType::NOTE;
3018
3019                         // Add OEmbed and other information to the body
3020                         if (!self::isHubzilla($contact["url"])) {
3021                                 $body = add_page_info_to_body($body, false, true);
3022                         }
3023                 }
3024
3025                 /// @todo enable support for polls
3026                 //if ($data->poll) {
3027                 //      foreach ($data->poll AS $poll)
3028                 //              print_r($poll);
3029                 //      die("poll!\n");
3030                 //}
3031
3032                 /// @todo enable support for events
3033
3034                 $datarray["uid"] = $importer["uid"];
3035                 $datarray["contact-id"] = $contact["id"];
3036                 $datarray["network"] = Protocol::DIASPORA;
3037
3038                 $datarray["author-link"] = $contact["url"];
3039                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
3040
3041                 $datarray["owner-link"] = $datarray["author-link"];
3042                 $datarray["owner-id"] = $datarray["author-id"];
3043
3044                 $datarray["guid"] = $guid;
3045                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
3046                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
3047
3048                 $datarray["verb"] = Activity::POST;
3049                 $datarray["gravity"] = GRAVITY_PARENT;
3050
3051                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
3052                 $datarray["source"] = $xml;
3053
3054                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
3055
3056                 self::storeMentions($datarray['uri-id'], $text);
3057                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
3058
3059                 if ($provider_display_name != "") {
3060                         $datarray["app"] = $provider_display_name;
3061                 }
3062
3063                 $datarray["plink"] = self::plink($author, $guid);
3064                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
3065                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
3066
3067                 if (isset($address["address"])) {
3068                         $datarray["location"] = $address["address"];
3069                 }
3070
3071                 if (isset($address["lat"]) && isset($address["lng"])) {
3072                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
3073                 }
3074
3075                 self::fetchGuid($datarray);
3076                 $message_id = Item::insert($datarray);
3077
3078                 self::sendParticipation($contact, $datarray);
3079
3080                 if ($message_id) {
3081                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
3082                         if ($datarray['uid'] == 0) {
3083                                 Item::distribute($message_id);
3084                         }
3085                         return true;
3086                 } else {
3087                         return false;
3088                 }
3089         }
3090
3091         /* ************************************************************************************** *
3092          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
3093          * ************************************************************************************** */
3094
3095         /**
3096          * returnes the handle of a contact
3097          *
3098          * @param array $contact contact array
3099          *
3100          * @return string the handle in the format user@domain.tld
3101          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3102          */
3103         private static function myHandle(array $contact)
3104         {
3105                 if (!empty($contact["addr"])) {
3106                         return $contact["addr"];
3107                 }
3108
3109                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
3110                 // So - just in case - we build the the address here.
3111                 if ($contact["nickname"] != "") {
3112                         $nick = $contact["nickname"];
3113                 } else {
3114                         $nick = $contact["nick"];
3115                 }
3116
3117                 return $nick . "@" . substr(DI::baseUrl(), strpos(DI::baseUrl(), "://") + 3);
3118         }
3119
3120
3121         /**
3122          * Creates the data for a private message in the new format
3123          *
3124          * @param string $msg     The message that is to be transmitted
3125          * @param array  $user    The record of the sender
3126          * @param array  $contact Target of the communication
3127          * @param string $prvkey  The private key of the sender
3128          * @param string $pubkey  The public key of the receiver
3129          *
3130          * @return string The encrypted data
3131          * @throws \Exception
3132          */
3133         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
3134         {
3135                 Logger::log("Message: ".$msg, Logger::DATA);
3136
3137                 // without a public key nothing will work
3138                 if (!$pubkey) {
3139                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
3140                         return false;
3141                 }
3142
3143                 $aes_key = openssl_random_pseudo_bytes(32);
3144                 $b_aes_key = base64_encode($aes_key);
3145                 $iv = openssl_random_pseudo_bytes(16);
3146                 $b_iv = base64_encode($iv);
3147
3148                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3149
3150                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3151
3152                 $encrypted_key_bundle = "";
3153                 if (!@openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey)) {
3154                         return false;
3155                 }
3156
3157                 $json_object = json_encode(
3158                         ["aes_key" => base64_encode($encrypted_key_bundle),
3159                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3160                 );
3161
3162                 return $json_object;
3163         }
3164
3165         /**
3166          * Creates the envelope for the "fetch" endpoint and for the new format
3167          *
3168          * @param string $msg  The message that is to be transmitted
3169          * @param array  $user The record of the sender
3170          *
3171          * @return string The envelope
3172          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3173          */
3174         public static function buildMagicEnvelope($msg, array $user)
3175         {
3176                 $b64url_data = Strings::base64UrlEncode($msg);
3177                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3178
3179                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
3180                 $type = "application/xml";
3181                 $encoding = "base64url";
3182                 $alg = "RSA-SHA256";
3183                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
3184
3185                 // Fallback if the private key wasn't transmitted in the expected field
3186                 if ($user['uprvkey'] == "") {
3187                         $user['uprvkey'] = $user['prvkey'];
3188                 }
3189
3190                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3191                 $sig = Strings::base64UrlEncode($signature);
3192
3193                 $xmldata = ["me:env" => ["me:data" => $data,
3194                                                         "@attributes" => ["type" => $type],
3195                                                         "me:encoding" => $encoding,
3196                                                         "me:alg" => $alg,
3197                                                         "me:sig" => $sig,
3198                                                         "@attributes2" => ["key_id" => $key_id]]];
3199
3200                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3201
3202                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3203         }
3204
3205         /**
3206          * Create the envelope for a message
3207          *
3208          * @param string $msg     The message that is to be transmitted
3209          * @param array  $user    The record of the sender
3210          * @param array  $contact Target of the communication
3211          * @param string $prvkey  The private key of the sender
3212          * @param string $pubkey  The public key of the receiver
3213          * @param bool   $public  Is the message public?
3214          *
3215          * @return string The message that will be transmitted to other servers
3216          * @throws \Exception
3217          */
3218         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3219         {
3220                 // The message is put into an envelope with the sender's signature
3221                 $envelope = self::buildMagicEnvelope($msg, $user);
3222
3223                 // Private messages are put into a second envelope, encrypted with the receivers public key
3224                 if (!$public) {
3225                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3226                 }
3227
3228                 return $envelope;
3229         }
3230
3231         /**
3232          * Creates a signature for a message
3233          *
3234          * @param array $owner   the array of the owner of the message
3235          * @param array $message The message that is to be signed
3236          *
3237          * @return string The signature
3238          */
3239         private static function signature($owner, $message)
3240         {
3241                 $sigmsg = $message;
3242                 unset($sigmsg["author_signature"]);
3243                 unset($sigmsg["parent_author_signature"]);
3244
3245                 $signed_text = implode(";", $sigmsg);
3246
3247                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3248         }
3249
3250         /**
3251          * Transmit a message to a target server
3252          *
3253          * @param array  $owner        the array of the item owner
3254          * @param array  $contact      Target of the communication
3255          * @param string $envelope     The message that is to be transmitted
3256          * @param bool   $public_batch Is it a public post?
3257          * @param string $guid         message guid
3258          *
3259          * @return int Result of the transmission
3260          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3261          * @throws \ImagickException
3262          */
3263         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
3264         {
3265                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
3266                 if (!$enabled) {
3267                         return 200;
3268                 }
3269
3270                 $logid = Strings::getRandomHex(4);
3271
3272                 // We always try to use the data from the fcontact table.
3273                 // This is important for transmitting data to Friendica servers.
3274                 if (!empty($contact['addr'])) {
3275                         $fcontact = self::personByHandle($contact['addr']);
3276                         if (!empty($fcontact)) {
3277                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3278                         }
3279                 }
3280
3281                 if (empty($dest_url)) {
3282                         $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3283                 }
3284
3285                 if (!$dest_url) {
3286                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3287                         return 0;
3288                 }
3289
3290                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3291
3292                 if (!intval(DI::config()->get("system", "diaspora_test"))) {
3293                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3294
3295                         $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3296                         $return_code = $postResult->getReturnCode();
3297                 } else {
3298                         Logger::log("test_mode");
3299                         return 200;
3300                 }
3301
3302                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3303
3304                 return $return_code ? $return_code : -1;
3305         }
3306
3307
3308         /**
3309          * Build the post xml
3310          *
3311          * @param string $type    The message type
3312          * @param array  $message The message data
3313          *
3314          * @return string The post XML
3315          */
3316         public static function buildPostXml($type, $message)
3317         {
3318                 $data = [$type => $message];
3319
3320                 return XML::fromArray($data, $xml);
3321         }
3322
3323         /**
3324          * Builds and transmit messages
3325          *
3326          * @param array  $owner        the array of the item owner
3327          * @param array  $contact      Target of the communication
3328          * @param string $type         The message type
3329          * @param array  $message      The message data
3330          * @param bool   $public_batch Is it a public post?
3331          * @param string $guid         message guid
3332          *
3333          * @return int Result of the transmission
3334          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3335          * @throws \ImagickException
3336          */
3337         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "")
3338         {
3339                 $msg = self::buildPostXml($type, $message);
3340
3341                 Logger::log('message: '.$msg, Logger::DATA);
3342                 Logger::log('send guid '.$guid, Logger::DEBUG);
3343
3344                 // Fallback if the private key wasn't transmitted in the expected field
3345                 if (empty($owner['uprvkey'])) {
3346                         $owner['uprvkey'] = $owner['prvkey'];
3347                 }
3348
3349                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3350
3351                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3352
3353                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3354
3355                 return $return_code;
3356         }
3357
3358         /**
3359          * sends a participation (Used to get all further updates)
3360          *
3361          * @param array $contact Target of the communication
3362          * @param array $item    Item array
3363          *
3364          * @return int The result of the transmission
3365          * @throws \Exception
3366          */
3367         private static function sendParticipation(array $contact, array $item)
3368         {
3369                 // Don't send notifications for private postings
3370                 if ($item['private'] == Item::PRIVATE) {
3371                         return;
3372                 }
3373
3374                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3375
3376                 $result = DI::cache()->get($cachekey);
3377                 if (!is_null($result)) {
3378                         return;
3379                 }
3380
3381                 // Fetch some user id to have a valid handle to transmit the participation.
3382                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3383                 // If the item belongs to a user, we take this user id.
3384                 if ($item['uid'] == 0) {
3385                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3386                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3387                         $owner = User::getOwnerDataById($first_user['uid']);
3388                 } else {
3389                         $owner = User::getOwnerDataById($item['uid']);
3390                 }
3391
3392                 $author = self::myHandle($owner);
3393
3394                 $message = ["author" => $author,
3395                                 "guid" => System::createUUID(),
3396                                 "parent_type" => "Post",
3397                                 "parent_guid" => $item["guid"]];
3398
3399                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3400
3401                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3402                 DI::cache()->set($cachekey, $item["guid"], Duration::QUARTER_HOUR);
3403
3404                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3405         }
3406
3407         /**
3408          * sends an account migration
3409          *
3410          * @param array $owner   the array of the item owner
3411          * @param array $contact Target of the communication
3412          * @param int   $uid     User ID
3413          *
3414          * @return int The result of the transmission
3415          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3416          * @throws \ImagickException
3417          */
3418         public static function sendAccountMigration(array $owner, array $contact, $uid)
3419         {
3420                 $old_handle = DI::pConfig()->get($uid, 'system', 'previous_addr');
3421                 $profile = self::createProfileData($uid);
3422
3423                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3424                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3425
3426                 $message = ["author" => $old_handle,
3427                                 "profile" => $profile,
3428                                 "signature" => $signature];
3429
3430                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3431
3432                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3433         }
3434
3435         /**
3436          * Sends a "share" message
3437          *
3438          * @param array $owner   the array of the item owner
3439          * @param array $contact Target of the communication
3440          *
3441          * @return int The result of the transmission
3442          * @throws \Exception
3443          */
3444         public static function sendShare(array $owner, array $contact)
3445         {
3446                 /**
3447                  * @todo support the different possible combinations of "following" and "sharing"
3448                  * Currently, Diaspora only interprets the "sharing" field
3449                  *
3450                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3451                  */
3452
3453                 /*
3454                 switch ($contact["rel"]) {
3455                         case Contact::FRIEND:
3456                                 $following = true;
3457                                 $sharing = true;
3458
3459                         case Contact::SHARING:
3460                                 $following = false;
3461                                 $sharing = true;
3462
3463                         case Contact::FOLLOWER:
3464                                 $following = true;
3465                                 $sharing = false;
3466                 }
3467                 */
3468
3469                 $message = ["author" => self::myHandle($owner),
3470                                 "recipient" => $contact["addr"],
3471                                 "following" => "true",
3472                                 "sharing" => "true"];
3473
3474                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3475
3476                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3477         }
3478
3479         /**
3480          * sends an "unshare"
3481          *
3482          * @param array $owner   the array of the item owner
3483          * @param array $contact Target of the communication
3484          *
3485          * @return int The result of the transmission
3486          * @throws \Exception
3487          */
3488         public static function sendUnshare(array $owner, array $contact)
3489         {
3490                 $message = ["author" => self::myHandle($owner),
3491                                 "recipient" => $contact["addr"],
3492                                 "following" => "false",
3493                                 "sharing" => "false"];
3494
3495                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3496
3497                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3498         }
3499
3500         /**
3501          * Checks a message body if it is a reshare
3502          *
3503          * @param string $body     The message body that is to be check
3504          * @param bool   $complete Should it be a complete check or a simple check?
3505          *
3506          * @return array|bool Reshare details or "false" if no reshare
3507          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3508          * @throws \ImagickException
3509          */
3510         public static function isReshare($body, $complete = true)
3511         {
3512                 $body = trim($body);
3513
3514                 $reshared = Item::getShareArray(['body' => $body]);
3515                 if (empty($reshared)) {
3516                         return false;
3517                 }
3518
3519                 // Skip if it isn't a pure repeated messages
3520                 // Does it start with a share?
3521                 if (!empty($reshared['comment']) && $complete) {
3522                         return false;
3523                 }
3524
3525                 if (!empty($reshared['guid']) && $complete) {
3526                         $condition = ['guid' => $reshared['guid'], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3527                         $item = Item::selectFirst(['contact-id'], $condition);
3528                         if (DBA::isResult($item)) {
3529                                 $ret = [];
3530                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3531                                 $ret["root_guid"] = $reshared['guid'];
3532                                 return $ret;
3533                         } elseif ($complete) {
3534                                 // We are resharing something that isn't a DFRN or Diaspora post.
3535                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3536                                 return false;
3537                         }
3538                 } elseif (empty($reshared['guid']) && $complete) {
3539                         return false;
3540                 }
3541
3542                 $ret = [];
3543
3544                 if (!empty($reshared['profile']) && ($cid = Contact::getIdForURL($reshared['profile']))) {
3545                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $cid]);
3546                         if (!empty($contact['addr'])) {
3547                                 $ret['root_handle'] = $contact['addr'];
3548                         }
3549                 }
3550
3551                 if (empty($ret) && !$complete) {
3552                         return true;
3553                 }
3554
3555                 return $ret;
3556         }
3557
3558         /**
3559          * Create an event array
3560          *
3561          * @param integer $event_id The id of the event
3562          *
3563          * @return array with event data
3564          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3565          */
3566         private static function buildEvent($event_id)
3567         {
3568                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3569                 if (!DBA::isResult($r)) {
3570                         return [];
3571                 }
3572
3573                 $event = $r[0];
3574
3575                 $eventdata = [];
3576
3577                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3578                 if (!DBA::isResult($r)) {
3579                         return [];
3580                 }
3581
3582                 $user = $r[0];
3583
3584                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3585                 if (!DBA::isResult($r)) {
3586                         return [];
3587                 }
3588
3589                 $owner = $r[0];
3590
3591                 $eventdata['author'] = self::myHandle($owner);
3592
3593                 if ($event['guid']) {
3594                         $eventdata['guid'] = $event['guid'];
3595                 }
3596
3597                 $mask = DateTimeFormat::ATOM;
3598
3599                 /// @todo - establish "all day" events in Friendica
3600                 $eventdata["all_day"] = "false";
3601
3602                 $eventdata['timezone'] = 'UTC';
3603                 if (!$event['adjust'] && $user['timezone']) {
3604                         $eventdata['timezone'] = $user['timezone'];
3605                 }
3606
3607                 if ($event['start']) {
3608                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3609                 }
3610                 if ($event['finish'] && !$event['nofinish']) {
3611                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3612                 }
3613                 if ($event['summary']) {
3614                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3615                 }
3616                 if ($event['desc']) {
3617                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3618                 }
3619                 if ($event['location']) {
3620                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3621                         $coord = Map::getCoordinates($event['location']);
3622
3623                         $location = [];
3624                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3625                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3626                                 $location["lat"] = $coord['lat'];
3627                                 $location["lng"] = $coord['lon'];
3628                         } else {
3629                                 $location["lat"] = 0;
3630                                 $location["lng"] = 0;
3631                         }
3632                         $eventdata['location'] = $location;
3633                 }
3634
3635                 return $eventdata;
3636         }
3637
3638         /**
3639          * Create a post (status message or reshare)
3640          *
3641          * @param array $item  The item that will be exported
3642          * @param array $owner the array of the item owner
3643          *
3644          * @return array
3645          * 'type' -> Message type ("status_message" or "reshare")
3646          * 'message' -> Array of XML elements of the status
3647          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3648          * @throws \ImagickException
3649          */
3650         public static function buildStatus(array $item, array $owner)
3651         {
3652                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3653
3654                 $result = DI::cache()->get($cachekey);
3655                 if (!is_null($result)) {
3656                         return $result;
3657                 }
3658
3659                 $myaddr = self::myHandle($owner);
3660
3661                 $public = ($item["private"] == Item::PRIVATE ? "false" : "true");
3662                 $created = DateTimeFormat::utc($item['received'], DateTimeFormat::ATOM);
3663                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3664
3665                 // Detect a share element and do a reshare
3666                 if (($item['private'] != Item::PRIVATE) && ($ret = self::isReshare($item["body"]))) {
3667                         $message = ["author" => $myaddr,
3668                                         "guid" => $item["guid"],
3669                                         "created_at" => $created,
3670                                         "root_author" => $ret["root_handle"],
3671                                         "root_guid" => $ret["root_guid"],
3672                                         "provider_display_name" => $item["app"],
3673                                         "public" => $public];
3674
3675                         $type = "reshare";
3676                 } else {
3677                         $title = $item["title"];
3678                         $body = $item["body"];
3679
3680                         // Fetch the title from an attached link - if there is one
3681                         if (empty($item["title"]) && DI::pConfig()->get($owner['uid'], 'system', 'attach_link_title')) {
3682                                 $page_data = BBCode::getAttachmentData($item['body']);
3683                                 if (!empty($page_data['type']) && !empty($page_data['title']) && ($page_data['type'] == 'link')) {
3684                                         $title = $page_data['title'];
3685                                 }
3686                         }
3687
3688                         if ($item['author-link'] != $item['owner-link']) {
3689                                 require_once 'mod/share.php';
3690                                 $body = BBCode::getShareOpeningTag($item['author-name'], $item['author-link'], $item['author-avatar'],
3691                                         $item['plink'], $item['created']) . $body . '[/share]';
3692                         }
3693
3694                         // convert to markdown
3695                         $body = html_entity_decode(BBCode::toMarkdown($body));
3696
3697                         // Adding the title
3698                         if (strlen($title)) {
3699                                 $body = "### ".html_entity_decode($title)."\n\n".$body;
3700                         }
3701
3702                         if ($item["attach"]) {
3703                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3704                                 if ($cnt) {
3705                                         $body .= "\n".DI::l10n()->t("Attachments:")."\n";
3706                                         foreach ($matches as $mtch) {
3707                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3708                                         }
3709                                 }
3710                         }
3711
3712                         $location = [];
3713
3714                         if ($item["location"] != "")
3715                                 $location["address"] = $item["location"];
3716
3717                         if ($item["coord"] != "") {
3718                                 $coord = explode(" ", $item["coord"]);
3719                                 $location["lat"] = $coord[0];
3720                                 $location["lng"] = $coord[1];
3721                         }
3722
3723                         $message = ["author" => $myaddr,
3724                                         "guid" => $item["guid"],
3725                                         "created_at" => $created,
3726                                         "edited_at" => $edited,
3727                                         "public" => $public,
3728                                         "text" => $body,
3729                                         "provider_display_name" => $item["app"],
3730                                         "location" => $location];
3731
3732                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3733                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3734                                 unset($message["location"]);
3735                         }
3736
3737                         if ($item['event-id'] > 0) {
3738                                 $event = self::buildEvent($item['event-id']);
3739                                 if (count($event)) {
3740                                         $message['event'] = $event;
3741
3742                                         if (!empty($event['location']['address']) &&
3743                                                 !empty($event['location']['lat']) &&
3744                                                 !empty($event['location']['lng'])) {
3745                                                 $message['location'] = $event['location'];
3746                                         }
3747
3748                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3749                                         // $message['text'] = '';
3750                                 }
3751                         }
3752
3753                         $type = "status_message";
3754                 }
3755
3756                 $msg = ["type" => $type, "message" => $message];
3757
3758                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
3759
3760                 return $msg;
3761         }
3762
3763         private static function prependParentAuthorMention($body, $profile_url)
3764         {
3765                 $profile = Contact::getDetailsByURL($profile_url);
3766                 if (!empty($profile['addr'])
3767                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3768                         && !strstr($body, $profile['addr'])
3769                         && !strstr($body, $profile_url)
3770                 ) {
3771                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3772                 }
3773
3774                 return $body;
3775         }
3776
3777         /**
3778          * Sends a post
3779          *
3780          * @param array $item         The item that will be exported
3781          * @param array $owner        the array of the item owner
3782          * @param array $contact      Target of the communication
3783          * @param bool  $public_batch Is it a public post?
3784          *
3785          * @return int The result of the transmission
3786          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3787          * @throws \ImagickException
3788          */
3789         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3790         {
3791                 $status = self::buildStatus($item, $owner);
3792
3793                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3794         }
3795
3796         /**
3797          * Creates a "like" object
3798          *
3799          * @param array $item  The item that will be exported
3800          * @param array $owner the array of the item owner
3801          *
3802          * @return array The data for a "like"
3803          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3804          */
3805         private static function constructLike(array $item, array $owner)
3806         {
3807                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3808                 if (!DBA::isResult($parent)) {
3809                         return false;
3810                 }
3811
3812                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3813                 $positive = null;
3814                 if ($item['verb'] === Activity::LIKE) {
3815                         $positive = "true";
3816                 } elseif ($item['verb'] === Activity::DISLIKE) {
3817                         $positive = "false";
3818                 }
3819
3820                 return(["author" => self::myHandle($owner),
3821                                 "guid" => $item["guid"],
3822                                 "parent_guid" => $parent["guid"],
3823                                 "parent_type" => $target_type,
3824                                 "positive" => $positive,
3825                                 "author_signature" => ""]);
3826         }
3827
3828         /**
3829          * Creates an "EventParticipation" object
3830          *
3831          * @param array $item  The item that will be exported
3832          * @param array $owner the array of the item owner
3833          *
3834          * @return array The data for an "EventParticipation"
3835          * @throws \Exception
3836          */
3837         private static function constructAttend(array $item, array $owner)
3838         {
3839                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3840                 if (!DBA::isResult($parent)) {
3841                         return false;
3842                 }
3843
3844                 switch ($item['verb']) {
3845                         case Activity::ATTEND:
3846                                 $attend_answer = 'accepted';
3847                                 break;
3848                         case Activity::ATTENDNO:
3849                                 $attend_answer = 'declined';
3850                                 break;
3851                         case Activity::ATTENDMAYBE:
3852                                 $attend_answer = 'tentative';
3853                                 break;
3854                         default:
3855                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3856                                 return false;
3857                 }
3858
3859                 return(["author" => self::myHandle($owner),
3860                                 "guid" => $item["guid"],
3861                                 "parent_guid" => $parent["guid"],
3862                                 "status" => $attend_answer,
3863                                 "author_signature" => ""]);
3864         }
3865
3866         /**
3867          * Creates the object for a comment
3868          *
3869          * @param array $item  The item that will be exported
3870          * @param array $owner the array of the item owner
3871          *
3872          * @return array|false The data for a comment
3873          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3874          */
3875         private static function constructComment(array $item, array $owner)
3876         {
3877                 $cachekey = "diaspora:constructComment:".$item['guid'];
3878
3879                 $result = DI::cache()->get($cachekey);
3880                 if (!is_null($result)) {
3881                         return $result;
3882                 }
3883
3884                 $toplevel_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['id' => $item['parent'], 'parent' => $item['parent']]);
3885                 if (!DBA::isResult($toplevel_item)) {
3886                         Logger::error('Missing parent conversation item', ['parent' => $item['parent']]);
3887                         return false;
3888                 }
3889
3890                 $thread_parent_item = $toplevel_item;
3891                 if ($item['thr-parent'] != $item['parent-uri']) {
3892                         $thread_parent_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3893                 }
3894
3895                 $body = $item["body"];
3896
3897                 // The replied to autor mention is prepended for clarity if:
3898                 // - Item replied isn't yours
3899                 // - Item is public or explicit mentions are disabled
3900                 // - Implicit mentions are enabled
3901                 if (
3902                         $item['author-id'] != $thread_parent_item['author-id']
3903                         && (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3904                         && !DI::config()->get('system', 'disable_implicit_mentions')
3905                 ) {
3906                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3907                 }
3908
3909                 $text = html_entity_decode(BBCode::toMarkdown($body));
3910                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3911                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3912
3913                 $comment = [
3914                         "author"      => self::myHandle($owner),
3915                         "guid"        => $item["guid"],
3916                         "created_at"  => $created,
3917                         "edited_at"   => $edited,
3918                         "parent_guid" => $toplevel_item["guid"],
3919                         "text"        => $text,
3920                         "author_signature" => ""
3921                 ];
3922
3923                 // Send the thread parent guid only if it is a threaded comment
3924                 if ($item['thr-parent'] != $item['parent-uri']) {
3925                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3926                 }
3927
3928                 DI::cache()->set($cachekey, $comment, Duration::QUARTER_HOUR);
3929
3930                 return($comment);
3931         }
3932
3933         /**
3934          * Send a like or a comment
3935          *
3936          * @param array $item         The item that will be exported
3937          * @param array $owner        the array of the item owner
3938          * @param array $contact      Target of the communication
3939          * @param bool  $public_batch Is it a public post?
3940          *
3941          * @return int The result of the transmission
3942          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3943          * @throws \ImagickException
3944          */
3945         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3946         {
3947                 if (in_array($item['verb'], [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE])) {
3948                         $message = self::constructAttend($item, $owner);
3949                         $type = "event_participation";
3950                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3951                         $message = self::constructLike($item, $owner);
3952                         $type = "like";
3953                 } elseif (!in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
3954                         $message = self::constructComment($item, $owner);
3955                         $type = "comment";
3956                 }
3957
3958                 if (empty($message)) {
3959                         return false;
3960                 }
3961
3962                 $message["author_signature"] = self::signature($owner, $message);
3963
3964                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3965         }
3966
3967         /**
3968          * Creates a message from a signature record entry
3969          *
3970          * @param array $item The item that will be exported
3971          * @return array The message
3972          */
3973         private static function messageFromSignature(array $item)
3974         {
3975                 // Split the signed text
3976                 $signed_parts = explode(";", $item['signed_text']);
3977
3978                 if ($item["deleted"]) {
3979                         $message = ["author" => $item['signer'],
3980                                         "target_guid" => $signed_parts[0],
3981                                         "target_type" => $signed_parts[1]];
3982                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3983                         $message = ["author" => $signed_parts[4],
3984                                         "guid" => $signed_parts[1],
3985                                         "parent_guid" => $signed_parts[3],
3986                                         "parent_type" => $signed_parts[2],
3987                                         "positive" => $signed_parts[0],
3988                                         "author_signature" => $item['signature'],
3989                                         "parent_author_signature" => ""];
3990                 } else {
3991                         // Remove the comment guid
3992                         $guid = array_shift($signed_parts);
3993
3994                         // Remove the parent guid
3995                         $parent_guid = array_shift($signed_parts);
3996
3997                         // Remove the handle
3998                         $handle = array_pop($signed_parts);
3999
4000                         $message = [
4001                                 "author" => $handle,
4002                                 "guid" => $guid,
4003                                 "parent_guid" => $parent_guid,
4004                                 "text" => implode(";", $signed_parts),
4005                                 "author_signature" => $item['signature'],
4006                                 "parent_author_signature" => ""
4007                         ];
4008                 }
4009                 return $message;
4010         }
4011
4012         /**
4013          * Relays messages (like, comment, retraction) to other servers if we are the thread owner
4014          *
4015          * @param array $item         The item that will be exported
4016          * @param array $owner        the array of the item owner
4017          * @param array $contact      Target of the communication
4018          * @param bool  $public_batch Is it a public post?
4019          *
4020          * @return int The result of the transmission
4021          * @throws \Exception
4022          */
4023         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
4024         {
4025                 if ($item["deleted"]) {
4026                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
4027                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4028                         $type = "like";
4029                 } else {
4030                         $type = "comment";
4031                 }
4032
4033                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
4034
4035                 $msg = json_decode($item['signed_text'], true);
4036
4037                 $message = [];
4038                 if (is_array($msg)) {
4039                         foreach ($msg as $field => $data) {
4040                                 if (!$item["deleted"]) {
4041                                         if ($field == "diaspora_handle") {
4042                                                 $field = "author";
4043                                         }
4044                                         if ($field == "target_type") {
4045                                                 $field = "parent_type";
4046                                         }
4047                                 }
4048
4049                                 $message[$field] = $data;
4050                         }
4051                 } else {
4052                         Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
4053                 }
4054
4055                 $message["parent_author_signature"] = self::signature($owner, $message);
4056
4057                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
4058
4059                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
4060         }
4061
4062         /**
4063          * Sends a retraction (deletion) of a message, like or comment
4064          *
4065          * @param array $item         The item that will be exported
4066          * @param array $owner        the array of the item owner
4067          * @param array $contact      Target of the communication
4068          * @param bool  $public_batch Is it a public post?
4069          * @param bool  $relay        Is the retraction transmitted from a relay?
4070          *
4071          * @return int The result of the transmission
4072          * @throws \Exception
4073          */
4074         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
4075         {
4076                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
4077
4078                 $msg_type = "retraction";
4079
4080                 if ($item['gravity'] == GRAVITY_PARENT) {
4081                         $target_type = "Post";
4082                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4083                         $target_type = "Like";
4084                 } else {
4085                         $target_type = "Comment";
4086                 }
4087
4088                 $message = ["author" => $itemaddr,
4089                                 "target_guid" => $item['guid'],
4090                                 "target_type" => $target_type];
4091
4092                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
4093
4094                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
4095         }
4096
4097         /**
4098          * Sends a mail
4099          *
4100          * @param array $item    The item that will be exported
4101          * @param array $owner   The owner
4102          * @param array $contact Target of the communication
4103          *
4104          * @return int The result of the transmission
4105          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4106          * @throws \ImagickException
4107          */
4108         public static function sendMail(array $item, array $owner, array $contact)
4109         {
4110                 $myaddr = self::myHandle($owner);
4111
4112                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
4113                 if (!DBA::isResult($cnv)) {
4114                         Logger::log("conversation not found.");
4115                         return;
4116                 }
4117
4118                 $body = BBCode::toMarkdown($item["body"]);
4119                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4120
4121                 $msg = [
4122                         "author" => $myaddr,
4123                         "guid" => $item["guid"],
4124                         "conversation_guid" => $cnv["guid"],
4125                         "text" => $body,
4126                         "created_at" => $created,
4127                 ];
4128
4129                 if ($item["reply"]) {
4130                         $message = $msg;
4131                         $type = "message";
4132                 } else {
4133                         $message = [
4134                                 "author" => $cnv["creator"],
4135                                 "guid" => $cnv["guid"],
4136                                 "subject" => $cnv["subject"],
4137                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4138                                 "participants" => $cnv["recips"],
4139                                 "message" => $msg
4140                         ];
4141
4142                         $type = "conversation";
4143                 }
4144
4145                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4146         }
4147
4148         /**
4149          * Split a name into first name and last name
4150          *
4151          * @param string $name The name
4152          *
4153          * @return array The array with "first" and "last"
4154          */
4155         public static function splitName($name) {
4156                 $name = trim($name);
4157
4158                 // Is the name longer than 64 characters? Then cut the rest of it.
4159                 if (strlen($name) > 64) {
4160                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4161                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4162                         } else {
4163                                 $name = substr($name, 0, 64);
4164                         }
4165                 }
4166
4167                 // Take the first word as first name
4168                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4169                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4170                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4171                         return ['first' => $first, 'last' => $last];
4172                 }
4173
4174                 // Take the last word as last name
4175                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4176                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4177
4178                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4179                         return ['first' => $first, 'last' => $last];
4180                 }
4181
4182                 // Take the first 32 characters if there is no space in the first 32 characters
4183                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4184                         $first = substr($name, 0, 32);
4185                         $last = substr($name, 32);
4186                         return ['first' => $first, 'last' => $last];
4187                 }
4188
4189                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4190                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4191
4192                 // Check if the last name is longer than 32 characters
4193                 if (strlen($last) > 32) {
4194                         if (strpos($last, ' ') <= 32) {
4195                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4196                         } else {
4197                                 $last = substr($last, 0, 32);
4198                         }
4199                 }
4200
4201                 return ['first' => $first, 'last' => $last];
4202         }
4203
4204         /**
4205          * Create profile data
4206          *
4207          * @param int $uid The user id
4208          *
4209          * @return array The profile data
4210          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4211          */
4212         private static function createProfileData($uid)
4213         {
4214                 $profile = DBA::selectFirst('owner-view', ['uid', 'addr', 'name', 'location', 'net-publish', 'dob', 'about', 'pub_keywords'], ['uid' => $uid]);
4215                 if (!DBA::isResult($profile)) {
4216                         return [];
4217                 }
4218
4219                 $handle = $profile["addr"];
4220
4221                 $split_name = self::splitName($profile['name']);
4222                 $first = $split_name['first'];
4223                 $last = $split_name['last'];
4224
4225                 $large = DI::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4226                 $medium = DI::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4227                 $small = DI::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4228                 $searchable = ($profile['net-publish'] ? 'true' : 'false');
4229
4230                 $dob = null;
4231                 $about = null;
4232                 $location = null;
4233                 $tags = null;
4234                 if ($searchable === 'true') {
4235                         $dob = '';
4236
4237                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4238                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4239                                 if ($year < 1004) {
4240                                         $year = 1004;
4241                                 }
4242                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4243                         }
4244
4245                         $about = BBCode::toMarkdown($profile['about']);
4246
4247                         $location = $profile['location'];
4248                         $tags = '';
4249                         if ($profile['pub_keywords']) {
4250                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4251                                 $kw = str_replace('  ', ' ', $kw);
4252                                 $arr = explode(' ', $kw);
4253                                 if (count($arr)) {
4254                                         for ($x = 0; $x < 5; $x ++) {
4255                                                 if (!empty($arr[$x])) {
4256                                                         $tags .= '#'. trim($arr[$x]) .' ';
4257                                                 }
4258                                         }
4259                                 }
4260                         }
4261                         $tags = trim($tags);
4262                 }
4263
4264                 return ["author" => $handle,
4265                                 "first_name" => $first,
4266                                 "last_name" => $last,
4267                                 "image_url" => $large,
4268                                 "image_url_medium" => $medium,
4269                                 "image_url_small" => $small,
4270                                 "birthday" => $dob,
4271                                 "bio" => $about,
4272                                 "location" => $location,
4273                                 "searchable" => $searchable,
4274                                 "nsfw" => "false",
4275                                 "tag_string" => $tags];
4276         }
4277
4278         /**
4279          * Sends profile data
4280          *
4281          * @param int  $uid    The user id
4282          * @param bool $recips optional, default false
4283          * @return void
4284          * @throws \Exception
4285          */
4286         public static function sendProfile($uid, $recips = false)
4287         {
4288                 if (!$uid) {
4289                         return;
4290                 }
4291
4292                 $owner = User::getOwnerDataById($uid);
4293                 if (!$owner) {
4294                         return;
4295                 }
4296
4297                 if (!$recips) {
4298                         $recips = q(
4299                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4300                                 AND `uid` = %d AND `rel` != %d",
4301                                 DBA::escape(Protocol::DIASPORA),
4302                                 intval($uid),
4303                                 intval(Contact::SHARING)
4304                         );
4305                 }
4306
4307                 if (!$recips) {
4308                         return;
4309                 }
4310
4311                 $message = self::createProfileData($uid);
4312
4313                 // @ToDo Split this into single worker jobs
4314                 foreach ($recips as $recip) {
4315                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4316                         self::buildAndTransmit($owner, $recip, "profile", $message);
4317                 }
4318         }
4319
4320         /**
4321          * Creates the signature for likes that are created on our system
4322          *
4323          * @param integer $uid  The user of that comment
4324          * @param array   $item Item array
4325          *
4326          * @return array Signed content
4327          * @throws \Exception
4328          */
4329         public static function createLikeSignature($uid, array $item)
4330         {
4331                 $owner = User::getOwnerDataById($uid);
4332                 if (empty($owner)) {
4333                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4334                         return false;
4335                 }
4336
4337                 if (!in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4338                         return false;
4339                 }
4340
4341                 $message = self::constructLike($item, $owner);
4342                 if ($message === false) {
4343                         return false;
4344                 }
4345
4346                 $message["author_signature"] = self::signature($owner, $message);
4347
4348                 return $message;
4349         }
4350
4351         /**
4352          * Creates the signature for Comments that are created on our system
4353          *
4354          * @param integer $uid  The user of that comment
4355          * @param array   $item Item array
4356          *
4357          * @return array Signed content
4358          * @throws \Exception
4359          */
4360         public static function createCommentSignature($uid, array $item)
4361         {
4362                 $owner = User::getOwnerDataById($uid);
4363                 if (empty($owner)) {
4364                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4365                         return false;
4366                 }
4367
4368                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4369                 $item['thr-parent'] = $item['parent-uri'];
4370
4371                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4372                 if (!DBA::isResult($parent)) {
4373                         return;
4374                 }
4375
4376                 $item['parent-uri'] = $parent['parent-uri'];
4377
4378                 $message = self::constructComment($item, $owner);
4379                 if ($message === false) {
4380                         return false;
4381                 }
4382
4383                 $message["author_signature"] = self::signature($owner, $message);
4384
4385                 return $message;
4386         }
4387 }