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', 'verb'], ['parent' => $parent_item['id'], 'gravity' => [GRAVITY_COMMENT, GRAVITY_ACTIVITY]]);
2336                 while ($comment = Item::fetch($comments)) {
2337                         if (in_array($comment["verb"], [Activity::FOLLOW, Activity::TAG])) {
2338                                 Logger::info('participation messages are not relayed', ['item' => $comment['id']]);
2339                                 continue;
2340                         }
2341
2342                         Logger::info('Deliver participation', ['item' => $comment['id'], 'contact' => $author_contact["cid"]]);
2343                         if (Worker::add(PRIORITY_HIGH, 'Delivery', Delivery::POST, $comment['id'], $author_contact["cid"])) {
2344                                 Post\DeliveryData::incrementQueueCount($comment['uri-id'], 1);
2345                         }
2346                 }
2347                 DBA::close($comments);
2348
2349                 return true;
2350         }
2351
2352         /**
2353          * Processes photos - unneeded
2354          *
2355          * @param array  $importer Array of the importer user
2356          * @param object $data     The message object
2357          *
2358          * @return bool always true
2359          */
2360         private static function receivePhoto(array $importer, $data)
2361         {
2362                 // There doesn't seem to be a reason for this function,
2363                 // since the photo data is transmitted in the status message as well
2364                 return true;
2365         }
2366
2367         /**
2368          * Processes poll participations - unssupported
2369          *
2370          * @param array  $importer Array of the importer user
2371          * @param object $data     The message object
2372          *
2373          * @return bool always true
2374          */
2375         private static function receivePollParticipation(array $importer, $data)
2376         {
2377                 // We don't support polls by now
2378                 return true;
2379         }
2380
2381         /**
2382          * Processes incoming profile updates
2383          *
2384          * @param array  $importer Array of the importer user
2385          * @param object $data     The message object
2386          *
2387          * @return bool Success
2388          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2389          * @throws \ImagickException
2390          */
2391         private static function receiveProfile(array $importer, $data)
2392         {
2393                 $author = strtolower(Strings::escapeTags(XML::unescape($data->author)));
2394
2395                 $contact = self::contactByHandle($importer["uid"], $author);
2396                 if (!$contact) {
2397                         return false;
2398                 }
2399
2400                 $name = XML::unescape($data->first_name).((strlen($data->last_name)) ? " ".XML::unescape($data->last_name) : "");
2401                 $image_url = XML::unescape($data->image_url);
2402                 $birthday = XML::unescape($data->birthday);
2403                 $about = Markdown::toBBCode(XML::unescape($data->bio));
2404                 $location = Markdown::toBBCode(XML::unescape($data->location));
2405                 $searchable = (XML::unescape($data->searchable) == "true");
2406                 $nsfw = (XML::unescape($data->nsfw) == "true");
2407                 $tags = XML::unescape($data->tag_string);
2408
2409                 $tags = explode("#", $tags);
2410
2411                 $keywords = [];
2412                 foreach ($tags as $tag) {
2413                         $tag = trim(strtolower($tag));
2414                         if ($tag != "") {
2415                                 $keywords[] = $tag;
2416                         }
2417                 }
2418
2419                 $keywords = implode(", ", $keywords);
2420
2421                 $handle_parts = explode("@", $author);
2422                 $nick = $handle_parts[0];
2423
2424                 if ($name === "") {
2425                         $name = $handle_parts[0];
2426                 }
2427
2428                 if (preg_match("|^https?://|", $image_url) === 0) {
2429                         $image_url = "http://".$handle_parts[1].$image_url;
2430                 }
2431
2432                 Contact::updateAvatar($image_url, $importer["uid"], $contact["id"]);
2433
2434                 // Generic birthday. We don't know the timezone. The year is irrelevant.
2435
2436                 $birthday = str_replace("1000", "1901", $birthday);
2437
2438                 if ($birthday != "") {
2439                         $birthday = DateTimeFormat::utc($birthday, "Y-m-d");
2440                 }
2441
2442                 // this is to prevent multiple birthday notifications in a single year
2443                 // if we already have a stored birthday and the 'm-d' part hasn't changed, preserve the entry, which will preserve the notify year
2444
2445                 if (substr($birthday, 5) === substr($contact["bd"], 5)) {
2446                         $birthday = $contact["bd"];
2447                 }
2448
2449                 $fields = ['name' => $name, 'location' => $location,
2450                         'name-date' => DateTimeFormat::utcNow(), 'about' => $about,
2451                         'addr' => $author, 'nick' => $nick, 'keywords' => $keywords,
2452                         'unsearchable' => !$searchable, 'sensitive' => $nsfw];
2453
2454                 if (!empty($birthday)) {
2455                         $fields['bd'] = $birthday;
2456                 }
2457
2458                 DBA::update('contact', $fields, ['id' => $contact['id']]);
2459
2460                 // @todo Update the public contact, then update the gcontact from that
2461
2462                 $gcontact = ["url" => $contact["url"], "network" => Protocol::DIASPORA, "generation" => 2,
2463                                         "photo" => $image_url, "name" => $name, "location" => $location,
2464                                         "about" => $about, "birthday" => $birthday,
2465                                         "addr" => $author, "nick" => $nick, "keywords" => $keywords,
2466                                         "hide" => !$searchable, "nsfw" => $nsfw];
2467
2468                 $gcid = GContact::update($gcontact);
2469
2470                 GContact::link($gcid, $importer["uid"], $contact["id"]);
2471
2472                 Logger::log("Profile of contact ".$contact["id"]." stored for user ".$importer["uid"], Logger::DEBUG);
2473
2474                 return true;
2475         }
2476
2477         /**
2478          * Processes incoming friend requests
2479          *
2480          * @param array $importer Array of the importer user
2481          * @param array $contact  The contact that send the request
2482          * @return void
2483          * @throws \Exception
2484          */
2485         private static function receiveRequestMakeFriend(array $importer, array $contact)
2486         {
2487                 if ($contact["rel"] == Contact::SHARING) {
2488                         DBA::update(
2489                                 'contact',
2490                                 ['rel' => Contact::FRIEND, 'writable' => true],
2491                                 ['id' => $contact["id"], 'uid' => $importer["uid"]]
2492                         );
2493                 }
2494         }
2495
2496         /**
2497          * Processes incoming sharing notification
2498          *
2499          * @param array  $importer Array of the importer user
2500          * @param object $data     The message object
2501          *
2502          * @return bool Success
2503          * @throws \Exception
2504          */
2505         private static function receiveContactRequest(array $importer, $data)
2506         {
2507                 $author = XML::unescape($data->author);
2508                 $recipient = XML::unescape($data->recipient);
2509
2510                 if (!$author || !$recipient) {
2511                         return false;
2512                 }
2513
2514                 // the current protocol version doesn't know these fields
2515                 // That means that we will assume their existance
2516                 if (isset($data->following)) {
2517                         $following = (XML::unescape($data->following) == "true");
2518                 } else {
2519                         $following = true;
2520                 }
2521
2522                 if (isset($data->sharing)) {
2523                         $sharing = (XML::unescape($data->sharing) == "true");
2524                 } else {
2525                         $sharing = true;
2526                 }
2527
2528                 $contact = self::contactByHandle($importer["uid"], $author);
2529
2530                 // perhaps we were already sharing with this person. Now they're sharing with us.
2531                 // That makes us friends.
2532                 if ($contact) {
2533                         if ($following) {
2534                                 Logger::log("Author ".$author." (Contact ".$contact["id"].") wants to follow us.", Logger::DEBUG);
2535                                 self::receiveRequestMakeFriend($importer, $contact);
2536
2537                                 // refetch the contact array
2538                                 $contact = self::contactByHandle($importer["uid"], $author);
2539
2540                                 // If we are now friends, we are sending a share message.
2541                                 // Normally we needn't to do so, but the first message could have been vanished.
2542                                 if (in_array($contact["rel"], [Contact::FRIEND])) {
2543                                         $user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
2544                                         if (DBA::isResult($user)) {
2545                                                 Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
2546                                                 self::sendShare($user, $contact);
2547                                         }
2548                                 }
2549                                 return true;
2550                         } else {
2551                                 Logger::log("Author ".$author." doesn't want to follow us anymore.", Logger::DEBUG);
2552                                 Contact::removeFollower($importer, $contact);
2553                                 return true;
2554                         }
2555                 }
2556
2557                 if (!$following && $sharing && in_array($importer["page-flags"], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_NORMAL])) {
2558                         Logger::log("Author ".$author." wants to share with us - but doesn't want to listen. Request is ignored.", Logger::DEBUG);
2559                         return false;
2560                 } elseif (!$following && !$sharing) {
2561                         Logger::log("Author ".$author." doesn't want anything - and we don't know the author. Request is ignored.", Logger::DEBUG);
2562                         return false;
2563                 } elseif (!$following && $sharing) {
2564                         Logger::log("Author ".$author." wants to share with us.", Logger::DEBUG);
2565                 } elseif ($following && $sharing) {
2566                         Logger::log("Author ".$author." wants to have a bidirectional conection.", Logger::DEBUG);
2567                 } elseif ($following && !$sharing) {
2568                         Logger::log("Author ".$author." wants to listen to us.", Logger::DEBUG);
2569                 }
2570
2571                 $ret = self::personByHandle($author);
2572
2573                 if (!$ret || ($ret["network"] != Protocol::DIASPORA)) {
2574                         Logger::log("Cannot resolve diaspora handle ".$author." for ".$recipient);
2575                         return false;
2576                 }
2577
2578                 $cid = Contact::getIdForURL($ret['url'], $importer['uid']);
2579                 if (!empty($cid)) {
2580                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
2581                 } else {
2582                         $contact = [];
2583                 }
2584
2585                 $item = ['author-id' => Contact::getIdForURL($ret['url']),
2586                         'author-link' => $ret['url']];
2587
2588                 $result = Contact::addRelationship($importer, $contact, $item, false);
2589                 if ($result === true) {
2590                         $contact_record = self::contactByHandle($importer['uid'], $author);
2591                         if (!$contact_record) {
2592                                 Logger::info('unable to locate newly created contact record.');
2593                                 return;
2594                         }
2595
2596                         $user = DBA::selectFirst('user', [], ['uid' => $importer['uid']]);
2597                         if (DBA::isResult($user)) {
2598                                 self::sendShare($user, $contact_record);
2599
2600                                 // Send the profile data, maybe it weren't transmitted before
2601                                 self::sendProfile($importer['uid'], [$contact_record]);
2602                         }
2603                 }
2604
2605                 return true;
2606         }
2607
2608         /**
2609          * Fetches a message with a given guid
2610          *
2611          * @param string $guid        message guid
2612          * @param string $orig_author handle of the original post
2613          * @return array The fetched item
2614          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2615          * @throws \ImagickException
2616          */
2617         public static function originalItem($guid, $orig_author)
2618         {
2619                 if (empty($guid)) {
2620                         Logger::log('Empty guid. Quitting.');
2621                         return false;
2622                 }
2623
2624                 // Do we already have this item?
2625                 $fields = ['body', 'title', 'attach', 'app', 'created', 'object-type', 'uri', 'guid',
2626                         'author-name', 'author-link', 'author-avatar'];
2627                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2628                 $item = Item::selectFirst($fields, $condition);
2629
2630                 if (DBA::isResult($item)) {
2631                         Logger::log("reshared message ".$guid." already exists on system.");
2632
2633                         // Maybe it is already a reshared item?
2634                         // Then refetch the content, if it is a reshare from a reshare.
2635                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2636                         if (self::isReshare($item["body"], true)) {
2637                                 $item = [];
2638                         } elseif (self::isReshare($item["body"], false) || strstr($item["body"], "[share")) {
2639                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2640
2641                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2642
2643                                 // Add OEmbed and other information to the body
2644                                 $item["body"] = add_page_info_to_body($item["body"], false, true);
2645
2646                                 return $item;
2647                         } else {
2648                                 return $item;
2649                         }
2650                 }
2651
2652                 if (!DBA::isResult($item)) {
2653                         if (empty($orig_author)) {
2654                                 Logger::log('Empty author for guid ' . $guid . '. Quitting.');
2655                                 return false;
2656                         }
2657
2658                         $server = "https://".substr($orig_author, strpos($orig_author, "@") + 1);
2659                         Logger::log("1st try: reshared message ".$guid." will be fetched via SSL from the server ".$server);
2660                         $stored = self::storeByGuid($guid, $server);
2661
2662                         if (!$stored) {
2663                                 $server = "http://".substr($orig_author, strpos($orig_author, "@") + 1);
2664                                 Logger::log("2nd try: reshared message ".$guid." will be fetched without SSL from the server ".$server);
2665                                 $stored = self::storeByGuid($guid, $server);
2666                         }
2667
2668                         if ($stored) {
2669                                 $fields = ['body', 'title', 'attach', 'app', 'created', 'object-type', 'uri', 'guid',
2670                                         'author-name', 'author-link', 'author-avatar'];
2671                                 $condition = ['guid' => $guid, 'visible' => true, 'deleted' => false, 'private' => [Item::PUBLIC, Item::UNLISTED]];
2672                                 $item = Item::selectFirst($fields, $condition);
2673
2674                                 if (DBA::isResult($item)) {
2675                                         // If it is a reshared post from another network then reformat to avoid display problems with two share elements
2676                                         if (self::isReshare($item["body"], false)) {
2677                                                 $item["body"] = Markdown::toBBCode(BBCode::toMarkdown($item["body"]));
2678                                                 $item["body"] = self::replacePeopleGuid($item["body"], $item["author-link"]);
2679                                         }
2680
2681                                         return $item;
2682                                 }
2683                         }
2684                 }
2685                 return false;
2686         }
2687
2688         /**
2689          * Stores a reshare activity
2690          *
2691          * @param array   $item              Array of reshare post
2692          * @param integer $parent_message_id Id of the parent post
2693          * @param string  $guid              GUID string of reshare action
2694          * @param string  $author            Author handle
2695          */
2696         private static function addReshareActivity($item, $parent_message_id, $guid, $author)
2697         {
2698                 $parent = Item::selectFirst(['uri', 'guid'], ['id' => $parent_message_id]);
2699
2700                 $datarray = [];
2701
2702                 $datarray['uid'] = $item['uid'];
2703                 $datarray['contact-id'] = $item['contact-id'];
2704                 $datarray['network'] = $item['network'];
2705
2706                 $datarray['author-link'] = $item['author-link'];
2707                 $datarray['author-id'] = $item['author-id'];
2708
2709                 $datarray['owner-link'] = $datarray['author-link'];
2710                 $datarray['owner-id'] = $datarray['author-id'];
2711
2712                 $datarray['guid'] = $parent['guid'] . '-' . $guid;
2713                 $datarray['uri'] = self::getUriFromGuid($author, $datarray['guid']);
2714                 $datarray['parent-uri'] = $parent['uri'];
2715
2716                 $datarray['verb'] = $datarray['body'] = Activity::ANNOUNCE;
2717                 $datarray['gravity'] = GRAVITY_ACTIVITY;
2718                 $datarray['object-type'] = Activity\ObjectType::NOTE;
2719
2720                 $datarray['protocol'] = $item['protocol'];
2721
2722                 $datarray['plink'] = self::plink($author, $datarray['guid']);
2723                 $datarray['private'] = $item['private'];
2724                 $datarray['changed'] = $datarray['created'] = $datarray['edited'] = $item['created'];
2725
2726                 $message_id = Item::insert($datarray);
2727
2728                 if ($message_id) {
2729                         Logger::info('Stored reshare activity.', ['guid' => $guid, 'id' => $message_id]);
2730                         if ($datarray['uid'] == 0) {
2731                                 Item::distribute($message_id);
2732                         }
2733                 }
2734         }
2735
2736         /**
2737          * Processes a reshare message
2738          *
2739          * @param array  $importer Array of the importer user
2740          * @param object $data     The message object
2741          * @param string $xml      The original XML of the message
2742          *
2743          * @return int the message id
2744          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2745          * @throws \ImagickException
2746          */
2747         private static function receiveReshare(array $importer, $data, $xml)
2748         {
2749                 $author = Strings::escapeTags(XML::unescape($data->author));
2750                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2751                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2752                 $root_author = Strings::escapeTags(XML::unescape($data->root_author));
2753                 $root_guid = Strings::escapeTags(XML::unescape($data->root_guid));
2754                 /// @todo handle unprocessed property "provider_display_name"
2755                 $public = Strings::escapeTags(XML::unescape($data->public));
2756
2757                 $contact = self::allowedContactByHandle($importer, $author, false);
2758                 if (!$contact) {
2759                         return false;
2760                 }
2761
2762                 $message_id = self::messageExists($importer["uid"], $guid);
2763                 if ($message_id) {
2764                         return true;
2765                 }
2766
2767                 $original_item = self::originalItem($root_guid, $root_author);
2768                 if (!$original_item) {
2769                         return false;
2770                 }
2771
2772                 $orig_url = DI::baseUrl()."/display/".$original_item["guid"];
2773
2774                 $datarray = [];
2775
2776                 $datarray["uid"] = $importer["uid"];
2777                 $datarray["contact-id"] = $contact["id"];
2778                 $datarray["network"]  = Protocol::DIASPORA;
2779
2780                 $datarray["author-link"] = $contact["url"];
2781                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
2782
2783                 $datarray["owner-link"] = $datarray["author-link"];
2784                 $datarray["owner-id"] = $datarray["author-id"];
2785
2786                 $datarray["guid"] = $guid;
2787                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
2788                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
2789
2790                 $datarray["verb"] = Activity::POST;
2791                 $datarray["gravity"] = GRAVITY_PARENT;
2792
2793                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
2794                 $datarray["source"] = $xml;
2795
2796                 /// @todo Copy tag data from original post
2797
2798                 $prefix = share_header(
2799                         $original_item["author-name"],
2800                         $original_item["author-link"],
2801                         $original_item["author-avatar"],
2802                         $original_item["guid"],
2803                         $original_item["created"],
2804                         $orig_url
2805                 );
2806
2807                 if (!empty($original_item['title'])) {
2808                         $prefix .= '[h3]' . $original_item['title'] . "[/h3]\n";
2809                 }
2810
2811                 $datarray["body"] = $prefix.$original_item["body"]."[/share]";
2812
2813                 Tag::storeFromBody($datarray['uri-id'], $datarray["body"]);
2814
2815                 $datarray["attach"] = $original_item["attach"];
2816                 $datarray["app"]  = $original_item["app"];
2817
2818                 $datarray["plink"] = self::plink($author, $guid);
2819                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
2820                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
2821
2822                 $datarray["object-type"] = $original_item["object-type"];
2823
2824                 self::fetchGuid($datarray);
2825                 $message_id = Item::insert($datarray);
2826
2827                 self::sendParticipation($contact, $datarray);
2828
2829                 $root_message_id = self::messageExists($importer["uid"], $root_guid);
2830                 if ($root_message_id) {
2831                         self::addReshareActivity($datarray, $root_message_id, $guid, $author);
2832                 }
2833
2834                 if ($message_id) {
2835                         Logger::log("Stored reshare ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
2836                         if ($datarray['uid'] == 0) {
2837                                 Item::distribute($message_id);
2838                         }
2839                         return true;
2840                 } else {
2841                         return false;
2842                 }
2843         }
2844
2845         /**
2846          * Processes retractions
2847          *
2848          * @param array  $importer Array of the importer user
2849          * @param array  $contact  The contact of the item owner
2850          * @param object $data     The message object
2851          *
2852          * @return bool success
2853          * @throws \Exception
2854          */
2855         private static function itemRetraction(array $importer, array $contact, $data)
2856         {
2857                 $author = Strings::escapeTags(XML::unescape($data->author));
2858                 $target_guid = Strings::escapeTags(XML::unescape($data->target_guid));
2859                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2860
2861                 $person = self::personByHandle($author);
2862                 if (!is_array($person)) {
2863                         Logger::log("unable to find author detail for ".$author);
2864                         return false;
2865                 }
2866
2867                 if (empty($contact["url"])) {
2868                         $contact["url"] = $person["url"];
2869                 }
2870
2871                 // Fetch items that are about to be deleted
2872                 $fields = ['uid', 'id', 'parent', 'parent-uri', 'author-link', 'file'];
2873
2874                 // When we receive a public retraction, we delete every item that we find.
2875                 if ($importer['uid'] == 0) {
2876                         $condition = ['guid' => $target_guid, 'deleted' => false];
2877                 } else {
2878                         $condition = ['guid' => $target_guid, 'deleted' => false, 'uid' => $importer['uid']];
2879                 }
2880
2881                 $r = Item::select($fields, $condition);
2882                 if (!DBA::isResult($r)) {
2883                         Logger::log("Target guid ".$target_guid." was not found on this system for user ".$importer['uid'].".");
2884                         return false;
2885                 }
2886
2887                 while ($item = Item::fetch($r)) {
2888                         if (strstr($item['file'], '[')) {
2889                                 Logger::log("Target guid " . $target_guid . " for user " . $item['uid'] . " is filed. So it won't be deleted.", Logger::DEBUG);
2890                                 continue;
2891                         }
2892
2893                         // Fetch the parent item
2894                         $parent = Item::selectFirst(['author-link'], ['id' => $item['parent']]);
2895
2896                         // Only delete it if the parent author really fits
2897                         if (!Strings::compareLink($parent["author-link"], $contact["url"]) && !Strings::compareLink($item["author-link"], $contact["url"])) {
2898                                 Logger::log("Thread author ".$parent["author-link"]." and item author ".$item["author-link"]." don't fit to expected contact ".$contact["url"], Logger::DEBUG);
2899                                 continue;
2900                         }
2901
2902                         Item::markForDeletion(['id' => $item['id']]);
2903
2904                         Logger::log("Deleted target ".$target_guid." (".$item["id"].") from user ".$item["uid"]." parent: ".$item['parent'], Logger::DEBUG);
2905                 }
2906
2907                 return true;
2908         }
2909
2910         /**
2911          * Receives retraction messages
2912          *
2913          * @param array  $importer Array of the importer user
2914          * @param string $sender   The sender of the message
2915          * @param object $data     The message object
2916          *
2917          * @return bool Success
2918          * @throws \Exception
2919          */
2920         private static function receiveRetraction(array $importer, $sender, $data)
2921         {
2922                 $target_type = Strings::escapeTags(XML::unescape($data->target_type));
2923
2924                 $contact = self::contactByHandle($importer["uid"], $sender);
2925                 if (!$contact && (in_array($target_type, ["Contact", "Person"]))) {
2926                         Logger::log("cannot find contact for sender: ".$sender." and user ".$importer["uid"]);
2927                         return false;
2928                 }
2929
2930                 if (!$contact) {
2931                         $contact = [];
2932                 }
2933
2934                 Logger::log("Got retraction for ".$target_type.", sender ".$sender." and user ".$importer["uid"], Logger::DEBUG);
2935
2936                 switch ($target_type) {
2937                         case "Comment":
2938                         case "Like":
2939                         case "Post":
2940                         case "Reshare":
2941                         case "StatusMessage":
2942                                 return self::itemRetraction($importer, $contact, $data);
2943
2944                         case "PollParticipation":
2945                         case "Photo":
2946                                 // Currently unsupported
2947                                 break;
2948
2949                         default:
2950                                 Logger::log("Unknown target type ".$target_type);
2951                                 return false;
2952                 }
2953                 return true;
2954         }
2955
2956         /**
2957          * Receives status messages
2958          *
2959          * @param array            $importer Array of the importer user
2960          * @param SimpleXMLElement $data     The message object
2961          * @param string           $xml      The original XML of the message
2962          *
2963          * @return int The message id of the newly created item
2964          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2965          * @throws \ImagickException
2966          */
2967         private static function receiveStatusMessage(array $importer, SimpleXMLElement $data, $xml)
2968         {
2969                 $author = Strings::escapeTags(XML::unescape($data->author));
2970                 $guid = Strings::escapeTags(XML::unescape($data->guid));
2971                 $created_at = DateTimeFormat::utc(Strings::escapeTags(XML::unescape($data->created_at)));
2972                 $public = Strings::escapeTags(XML::unescape($data->public));
2973                 $text = XML::unescape($data->text);
2974                 $provider_display_name = Strings::escapeTags(XML::unescape($data->provider_display_name));
2975
2976                 $contact = self::allowedContactByHandle($importer, $author, false);
2977                 if (!$contact) {
2978                         return false;
2979                 }
2980
2981                 $message_id = self::messageExists($importer["uid"], $guid);
2982                 if ($message_id) {
2983                         return true;
2984                 }
2985
2986                 $address = [];
2987                 if ($data->location) {
2988                         foreach ($data->location->children() as $fieldname => $data) {
2989                                 $address[$fieldname] = Strings::escapeTags(XML::unescape($data));
2990                         }
2991                 }
2992
2993                 $body = Markdown::toBBCode($text);
2994
2995                 $datarray = [];
2996
2997                 // Attach embedded pictures to the body
2998                 if ($data->photo) {
2999                         foreach ($data->photo as $photo) {
3000                                 $body = "[img]".XML::unescape($photo->remote_photo_path).
3001                                         XML::unescape($photo->remote_photo_name)."[/img]\n".$body;
3002                         }
3003
3004                         $datarray["object-type"] = Activity\ObjectType::IMAGE;
3005                 } else {
3006                         $datarray["object-type"] = Activity\ObjectType::NOTE;
3007
3008                         // Add OEmbed and other information to the body
3009                         if (!self::isHubzilla($contact["url"])) {
3010                                 $body = add_page_info_to_body($body, false, true);
3011                         }
3012                 }
3013
3014                 /// @todo enable support for polls
3015                 //if ($data->poll) {
3016                 //      foreach ($data->poll AS $poll)
3017                 //              print_r($poll);
3018                 //      die("poll!\n");
3019                 //}
3020
3021                 /// @todo enable support for events
3022
3023                 $datarray["uid"] = $importer["uid"];
3024                 $datarray["contact-id"] = $contact["id"];
3025                 $datarray["network"] = Protocol::DIASPORA;
3026
3027                 $datarray["author-link"] = $contact["url"];
3028                 $datarray["author-id"] = Contact::getIdForURL($contact["url"], 0);
3029
3030                 $datarray["owner-link"] = $datarray["author-link"];
3031                 $datarray["owner-id"] = $datarray["author-id"];
3032
3033                 $datarray["guid"] = $guid;
3034                 $datarray["uri"] = $datarray["parent-uri"] = self::getUriFromGuid($author, $guid);
3035                 $datarray['uri-id'] = ItemURI::insert(['uri' => $datarray['uri'], 'guid' => $datarray['guid']]);
3036
3037                 $datarray["verb"] = Activity::POST;
3038                 $datarray["gravity"] = GRAVITY_PARENT;
3039
3040                 $datarray["protocol"] = Conversation::PARCEL_DIASPORA;
3041                 $datarray["source"] = $xml;
3042
3043                 $datarray["body"] = self::replacePeopleGuid($body, $contact["url"]);
3044
3045                 self::storeMentions($datarray['uri-id'], $text);
3046                 Tag::storeRawTagsFromBody($datarray['uri-id'], $datarray["body"]);
3047
3048                 if ($provider_display_name != "") {
3049                         $datarray["app"] = $provider_display_name;
3050                 }
3051
3052                 $datarray["plink"] = self::plink($author, $guid);
3053                 $datarray["private"] = (($public == "false") ? Item::PRIVATE : Item::PUBLIC);
3054                 $datarray["changed"] = $datarray["created"] = $datarray["edited"] = $created_at;
3055
3056                 if (isset($address["address"])) {
3057                         $datarray["location"] = $address["address"];
3058                 }
3059
3060                 if (isset($address["lat"]) && isset($address["lng"])) {
3061                         $datarray["coord"] = $address["lat"]." ".$address["lng"];
3062                 }
3063
3064                 self::fetchGuid($datarray);
3065                 $message_id = Item::insert($datarray);
3066
3067                 self::sendParticipation($contact, $datarray);
3068
3069                 if ($message_id) {
3070                         Logger::log("Stored item ".$datarray["guid"]." with message id ".$message_id, Logger::DEBUG);
3071                         if ($datarray['uid'] == 0) {
3072                                 Item::distribute($message_id);
3073                         }
3074                         return true;
3075                 } else {
3076                         return false;
3077                 }
3078         }
3079
3080         /* ************************************************************************************** *
3081          * Here are all the functions that are needed to transmit data with the Diaspora protocol *
3082          * ************************************************************************************** */
3083
3084         /**
3085          * returnes the handle of a contact
3086          *
3087          * @param array $contact contact array
3088          *
3089          * @return string the handle in the format user@domain.tld
3090          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3091          */
3092         private static function myHandle(array $contact)
3093         {
3094                 if (!empty($contact["addr"])) {
3095                         return $contact["addr"];
3096                 }
3097
3098                 // Normally we should have a filled "addr" field - but in the past this wasn't the case
3099                 // So - just in case - we build the the address here.
3100                 if ($contact["nickname"] != "") {
3101                         $nick = $contact["nickname"];
3102                 } else {
3103                         $nick = $contact["nick"];
3104                 }
3105
3106                 return $nick . "@" . substr(DI::baseUrl(), strpos(DI::baseUrl(), "://") + 3);
3107         }
3108
3109
3110         /**
3111          * Creates the data for a private message in the new format
3112          *
3113          * @param string $msg     The message that is to be transmitted
3114          * @param array  $user    The record of the sender
3115          * @param array  $contact Target of the communication
3116          * @param string $prvkey  The private key of the sender
3117          * @param string $pubkey  The public key of the receiver
3118          *
3119          * @return string The encrypted data
3120          * @throws \Exception
3121          */
3122         public static function encodePrivateData($msg, array $user, array $contact, $prvkey, $pubkey)
3123         {
3124                 Logger::log("Message: ".$msg, Logger::DATA);
3125
3126                 // without a public key nothing will work
3127                 if (!$pubkey) {
3128                         Logger::log("pubkey missing: contact id: ".$contact["id"]);
3129                         return false;
3130                 }
3131
3132                 $aes_key = openssl_random_pseudo_bytes(32);
3133                 $b_aes_key = base64_encode($aes_key);
3134                 $iv = openssl_random_pseudo_bytes(16);
3135                 $b_iv = base64_encode($iv);
3136
3137                 $ciphertext = self::aesEncrypt($aes_key, $iv, $msg);
3138
3139                 $json = json_encode(["iv" => $b_iv, "key" => $b_aes_key]);
3140
3141                 $encrypted_key_bundle = "";
3142                 if (!@openssl_public_encrypt($json, $encrypted_key_bundle, $pubkey)) {
3143                         return false;
3144                 }
3145
3146                 $json_object = json_encode(
3147                         ["aes_key" => base64_encode($encrypted_key_bundle),
3148                                         "encrypted_magic_envelope" => base64_encode($ciphertext)]
3149                 );
3150
3151                 return $json_object;
3152         }
3153
3154         /**
3155          * Creates the envelope for the "fetch" endpoint and for the new format
3156          *
3157          * @param string $msg  The message that is to be transmitted
3158          * @param array  $user The record of the sender
3159          *
3160          * @return string The envelope
3161          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3162          */
3163         public static function buildMagicEnvelope($msg, array $user)
3164         {
3165                 $b64url_data = Strings::base64UrlEncode($msg);
3166                 $data = str_replace(["\n", "\r", " ", "\t"], ["", "", "", ""], $b64url_data);
3167
3168                 $key_id = Strings::base64UrlEncode(self::myHandle($user));
3169                 $type = "application/xml";
3170                 $encoding = "base64url";
3171                 $alg = "RSA-SHA256";
3172                 $signable_data = $data.".".Strings::base64UrlEncode($type).".".Strings::base64UrlEncode($encoding).".".Strings::base64UrlEncode($alg);
3173
3174                 // Fallback if the private key wasn't transmitted in the expected field
3175                 if ($user['uprvkey'] == "") {
3176                         $user['uprvkey'] = $user['prvkey'];
3177                 }
3178
3179                 $signature = Crypto::rsaSign($signable_data, $user["uprvkey"]);
3180                 $sig = Strings::base64UrlEncode($signature);
3181
3182                 $xmldata = ["me:env" => ["me:data" => $data,
3183                                                         "@attributes" => ["type" => $type],
3184                                                         "me:encoding" => $encoding,
3185                                                         "me:alg" => $alg,
3186                                                         "me:sig" => $sig,
3187                                                         "@attributes2" => ["key_id" => $key_id]]];
3188
3189                 $namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
3190
3191                 return XML::fromArray($xmldata, $xml, false, $namespaces);
3192         }
3193
3194         /**
3195          * Create the envelope for a message
3196          *
3197          * @param string $msg     The message that is to be transmitted
3198          * @param array  $user    The record of the sender
3199          * @param array  $contact Target of the communication
3200          * @param string $prvkey  The private key of the sender
3201          * @param string $pubkey  The public key of the receiver
3202          * @param bool   $public  Is the message public?
3203          *
3204          * @return string The message that will be transmitted to other servers
3205          * @throws \Exception
3206          */
3207         public static function buildMessage($msg, array $user, array $contact, $prvkey, $pubkey, $public = false)
3208         {
3209                 // The message is put into an envelope with the sender's signature
3210                 $envelope = self::buildMagicEnvelope($msg, $user);
3211
3212                 // Private messages are put into a second envelope, encrypted with the receivers public key
3213                 if (!$public) {
3214                         $envelope = self::encodePrivateData($envelope, $user, $contact, $prvkey, $pubkey);
3215                 }
3216
3217                 return $envelope;
3218         }
3219
3220         /**
3221          * Creates a signature for a message
3222          *
3223          * @param array $owner   the array of the owner of the message
3224          * @param array $message The message that is to be signed
3225          *
3226          * @return string The signature
3227          */
3228         private static function signature($owner, $message)
3229         {
3230                 $sigmsg = $message;
3231                 unset($sigmsg["author_signature"]);
3232                 unset($sigmsg["parent_author_signature"]);
3233
3234                 $signed_text = implode(";", $sigmsg);
3235
3236                 return base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3237         }
3238
3239         /**
3240          * Transmit a message to a target server
3241          *
3242          * @param array  $owner        the array of the item owner
3243          * @param array  $contact      Target of the communication
3244          * @param string $envelope     The message that is to be transmitted
3245          * @param bool   $public_batch Is it a public post?
3246          * @param string $guid         message guid
3247          *
3248          * @return int Result of the transmission
3249          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3250          * @throws \ImagickException
3251          */
3252         private static function transmit(array $owner, array $contact, $envelope, $public_batch, $guid = "")
3253         {
3254                 $enabled = intval(DI::config()->get("system", "diaspora_enabled"));
3255                 if (!$enabled) {
3256                         return 200;
3257                 }
3258
3259                 $logid = Strings::getRandomHex(4);
3260
3261                 // We always try to use the data from the fcontact table.
3262                 // This is important for transmitting data to Friendica servers.
3263                 if (!empty($contact['addr'])) {
3264                         $fcontact = self::personByHandle($contact['addr']);
3265                         if (!empty($fcontact)) {
3266                                 $dest_url = ($public_batch ? $fcontact["batch"] : $fcontact["notify"]);
3267                         }
3268                 }
3269
3270                 if (empty($dest_url)) {
3271                         $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
3272                 }
3273
3274                 if (!$dest_url) {
3275                         Logger::log("no url for contact: ".$contact["id"]." batch mode =".$public_batch);
3276                         return 0;
3277                 }
3278
3279                 Logger::log("transmit: ".$logid."-".$guid." ".$dest_url);
3280
3281                 if (!intval(DI::config()->get("system", "diaspora_test"))) {
3282                         $content_type = (($public_batch) ? "application/magic-envelope+xml" : "application/json");
3283
3284                         $postResult = Network::post($dest_url."/", $envelope, ["Content-Type: ".$content_type]);
3285                         $return_code = $postResult->getReturnCode();
3286                 } else {
3287                         Logger::log("test_mode");
3288                         return 200;
3289                 }
3290
3291                 Logger::log("transmit: ".$logid."-".$guid." to ".$dest_url." returns: ".$return_code);
3292
3293                 return $return_code ? $return_code : -1;
3294         }
3295
3296
3297         /**
3298          * Build the post xml
3299          *
3300          * @param string $type    The message type
3301          * @param array  $message The message data
3302          *
3303          * @return string The post XML
3304          */
3305         public static function buildPostXml($type, $message)
3306         {
3307                 $data = [$type => $message];
3308
3309                 return XML::fromArray($data, $xml);
3310         }
3311
3312         /**
3313          * Builds and transmit messages
3314          *
3315          * @param array  $owner        the array of the item owner
3316          * @param array  $contact      Target of the communication
3317          * @param string $type         The message type
3318          * @param array  $message      The message data
3319          * @param bool   $public_batch Is it a public post?
3320          * @param string $guid         message guid
3321          *
3322          * @return int Result of the transmission
3323          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3324          * @throws \ImagickException
3325          */
3326         private static function buildAndTransmit(array $owner, array $contact, $type, $message, $public_batch = false, $guid = "")
3327         {
3328                 $msg = self::buildPostXml($type, $message);
3329
3330                 Logger::log('message: '.$msg, Logger::DATA);
3331                 Logger::log('send guid '.$guid, Logger::DEBUG);
3332
3333                 // Fallback if the private key wasn't transmitted in the expected field
3334                 if (empty($owner['uprvkey'])) {
3335                         $owner['uprvkey'] = $owner['prvkey'];
3336                 }
3337
3338                 $envelope = self::buildMessage($msg, $owner, $contact, $owner['uprvkey'], $contact['pubkey'], $public_batch);
3339
3340                 $return_code = self::transmit($owner, $contact, $envelope, $public_batch, $guid);
3341
3342                 Logger::log("guid: ".$guid." result ".$return_code, Logger::DEBUG);
3343
3344                 return $return_code;
3345         }
3346
3347         /**
3348          * sends a participation (Used to get all further updates)
3349          *
3350          * @param array $contact Target of the communication
3351          * @param array $item    Item array
3352          *
3353          * @return int The result of the transmission
3354          * @throws \Exception
3355          */
3356         private static function sendParticipation(array $contact, array $item)
3357         {
3358                 // Don't send notifications for private postings
3359                 if ($item['private'] == Item::PRIVATE) {
3360                         return;
3361                 }
3362
3363                 $cachekey = "diaspora:sendParticipation:".$item['guid'];
3364
3365                 $result = DI::cache()->get($cachekey);
3366                 if (!is_null($result)) {
3367                         return;
3368                 }
3369
3370                 // Fetch some user id to have a valid handle to transmit the participation.
3371                 // In fact it doesn't matter which user sends this - but it is needed by the protocol.
3372                 // If the item belongs to a user, we take this user id.
3373                 if ($item['uid'] == 0) {
3374                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false];
3375                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
3376                         $owner = User::getOwnerDataById($first_user['uid']);
3377                 } else {
3378                         $owner = User::getOwnerDataById($item['uid']);
3379                 }
3380
3381                 $author = self::myHandle($owner);
3382
3383                 $message = ["author" => $author,
3384                                 "guid" => System::createUUID(),
3385                                 "parent_type" => "Post",
3386                                 "parent_guid" => $item["guid"]];
3387
3388                 Logger::log("Send participation for ".$item["guid"]." by ".$author, Logger::DEBUG);
3389
3390                 // It doesn't matter what we store, we only want to avoid sending repeated notifications for the same item
3391                 DI::cache()->set($cachekey, $item["guid"], Duration::QUARTER_HOUR);
3392
3393                 return self::buildAndTransmit($owner, $contact, "participation", $message);
3394         }
3395
3396         /**
3397          * sends an account migration
3398          *
3399          * @param array $owner   the array of the item owner
3400          * @param array $contact Target of the communication
3401          * @param int   $uid     User ID
3402          *
3403          * @return int The result of the transmission
3404          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3405          * @throws \ImagickException
3406          */
3407         public static function sendAccountMigration(array $owner, array $contact, $uid)
3408         {
3409                 $old_handle = DI::pConfig()->get($uid, 'system', 'previous_addr');
3410                 $profile = self::createProfileData($uid);
3411
3412                 $signed_text = 'AccountMigration:'.$old_handle.':'.$profile['author'];
3413                 $signature = base64_encode(Crypto::rsaSign($signed_text, $owner["uprvkey"], "sha256"));
3414
3415                 $message = ["author" => $old_handle,
3416                                 "profile" => $profile,
3417                                 "signature" => $signature];
3418
3419                 Logger::log("Send account migration ".print_r($message, true), Logger::DEBUG);
3420
3421                 return self::buildAndTransmit($owner, $contact, "account_migration", $message);
3422         }
3423
3424         /**
3425          * Sends a "share" message
3426          *
3427          * @param array $owner   the array of the item owner
3428          * @param array $contact Target of the communication
3429          *
3430          * @return int The result of the transmission
3431          * @throws \Exception
3432          */
3433         public static function sendShare(array $owner, array $contact)
3434         {
3435                 /**
3436                  * @todo support the different possible combinations of "following" and "sharing"
3437                  * Currently, Diaspora only interprets the "sharing" field
3438                  *
3439                  * Before switching this code productive, we have to check all "sendShare" calls if "rel" is set correctly
3440                  */
3441
3442                 /*
3443                 switch ($contact["rel"]) {
3444                         case Contact::FRIEND:
3445                                 $following = true;
3446                                 $sharing = true;
3447
3448                         case Contact::SHARING:
3449                                 $following = false;
3450                                 $sharing = true;
3451
3452                         case Contact::FOLLOWER:
3453                                 $following = true;
3454                                 $sharing = false;
3455                 }
3456                 */
3457
3458                 $message = ["author" => self::myHandle($owner),
3459                                 "recipient" => $contact["addr"],
3460                                 "following" => "true",
3461                                 "sharing" => "true"];
3462
3463                 Logger::log("Send share ".print_r($message, true), Logger::DEBUG);
3464
3465                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3466         }
3467
3468         /**
3469          * sends an "unshare"
3470          *
3471          * @param array $owner   the array of the item owner
3472          * @param array $contact Target of the communication
3473          *
3474          * @return int The result of the transmission
3475          * @throws \Exception
3476          */
3477         public static function sendUnshare(array $owner, array $contact)
3478         {
3479                 $message = ["author" => self::myHandle($owner),
3480                                 "recipient" => $contact["addr"],
3481                                 "following" => "false",
3482                                 "sharing" => "false"];
3483
3484                 Logger::log("Send unshare ".print_r($message, true), Logger::DEBUG);
3485
3486                 return self::buildAndTransmit($owner, $contact, "contact", $message);
3487         }
3488
3489         /**
3490          * Checks a message body if it is a reshare
3491          *
3492          * @param string $body     The message body that is to be check
3493          * @param bool   $complete Should it be a complete check or a simple check?
3494          *
3495          * @return array|bool Reshare details or "false" if no reshare
3496          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3497          * @throws \ImagickException
3498          */
3499         public static function isReshare($body, $complete = true)
3500         {
3501                 $body = trim($body);
3502
3503                 $reshared = Item::getShareArray(['body' => $body]);
3504                 if (empty($reshared)) {
3505                         return false;
3506                 }
3507
3508                 // Skip if it isn't a pure repeated messages
3509                 // Does it start with a share?
3510                 if (!empty($reshared['comment']) && $complete) {
3511                         return false;
3512                 }
3513
3514                 if (!empty($reshared['guid']) && $complete) {
3515                         $condition = ['guid' => $reshared['guid'], 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
3516                         $item = Item::selectFirst(['contact-id'], $condition);
3517                         if (DBA::isResult($item)) {
3518                                 $ret = [];
3519                                 $ret["root_handle"] = self::handleFromContact($item["contact-id"]);
3520                                 $ret["root_guid"] = $reshared['guid'];
3521                                 return $ret;
3522                         } elseif ($complete) {
3523                                 // We are resharing something that isn't a DFRN or Diaspora post.
3524                                 // So we have to return "false" on "$complete" to not trigger a reshare.
3525                                 return false;
3526                         }
3527                 } elseif (empty($reshared['guid']) && $complete) {
3528                         return false;
3529                 }
3530
3531                 $ret = [];
3532
3533                 if (!empty($reshared['profile']) && ($cid = Contact::getIdForURL($reshared['profile']))) {
3534                         $contact = DBA::selectFirst('contact', ['addr'], ['id' => $cid]);
3535                         if (!empty($contact['addr'])) {
3536                                 $ret['root_handle'] = $contact['addr'];
3537                         }
3538                 }
3539
3540                 if (empty($ret) && !$complete) {
3541                         return true;
3542                 }
3543
3544                 return $ret;
3545         }
3546
3547         /**
3548          * Create an event array
3549          *
3550          * @param integer $event_id The id of the event
3551          *
3552          * @return array with event data
3553          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3554          */
3555         private static function buildEvent($event_id)
3556         {
3557                 $r = q("SELECT `guid`, `uid`, `start`, `finish`, `nofinish`, `summary`, `desc`, `location`, `adjust` FROM `event` WHERE `id` = %d", intval($event_id));
3558                 if (!DBA::isResult($r)) {
3559                         return [];
3560                 }
3561
3562                 $event = $r[0];
3563
3564                 $eventdata = [];
3565
3566                 $r = q("SELECT `timezone` FROM `user` WHERE `uid` = %d", intval($event['uid']));
3567                 if (!DBA::isResult($r)) {
3568                         return [];
3569                 }
3570
3571                 $user = $r[0];
3572
3573                 $r = q("SELECT `addr`, `nick` FROM `contact` WHERE `uid` = %d AND `self`", intval($event['uid']));
3574                 if (!DBA::isResult($r)) {
3575                         return [];
3576                 }
3577
3578                 $owner = $r[0];
3579
3580                 $eventdata['author'] = self::myHandle($owner);
3581
3582                 if ($event['guid']) {
3583                         $eventdata['guid'] = $event['guid'];
3584                 }
3585
3586                 $mask = DateTimeFormat::ATOM;
3587
3588                 /// @todo - establish "all day" events in Friendica
3589                 $eventdata["all_day"] = "false";
3590
3591                 $eventdata['timezone'] = 'UTC';
3592                 if (!$event['adjust'] && $user['timezone']) {
3593                         $eventdata['timezone'] = $user['timezone'];
3594                 }
3595
3596                 if ($event['start']) {
3597                         $eventdata['start'] = DateTimeFormat::convert($event['start'], "UTC", $eventdata['timezone'], $mask);
3598                 }
3599                 if ($event['finish'] && !$event['nofinish']) {
3600                         $eventdata['end'] = DateTimeFormat::convert($event['finish'], "UTC", $eventdata['timezone'], $mask);
3601                 }
3602                 if ($event['summary']) {
3603                         $eventdata['summary'] = html_entity_decode(BBCode::toMarkdown($event['summary']));
3604                 }
3605                 if ($event['desc']) {
3606                         $eventdata['description'] = html_entity_decode(BBCode::toMarkdown($event['desc']));
3607                 }
3608                 if ($event['location']) {
3609                         $event['location'] = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $event['location']);
3610                         $coord = Map::getCoordinates($event['location']);
3611
3612                         $location = [];
3613                         $location["address"] = html_entity_decode(BBCode::toMarkdown($event['location']));
3614                         if (!empty($coord['lat']) && !empty($coord['lon'])) {
3615                                 $location["lat"] = $coord['lat'];
3616                                 $location["lng"] = $coord['lon'];
3617                         } else {
3618                                 $location["lat"] = 0;
3619                                 $location["lng"] = 0;
3620                         }
3621                         $eventdata['location'] = $location;
3622                 }
3623
3624                 return $eventdata;
3625         }
3626
3627         /**
3628          * Create a post (status message or reshare)
3629          *
3630          * @param array $item  The item that will be exported
3631          * @param array $owner the array of the item owner
3632          *
3633          * @return array
3634          * 'type' -> Message type ("status_message" or "reshare")
3635          * 'message' -> Array of XML elements of the status
3636          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3637          * @throws \ImagickException
3638          */
3639         public static function buildStatus(array $item, array $owner)
3640         {
3641                 $cachekey = "diaspora:buildStatus:".$item['guid'];
3642
3643                 $result = DI::cache()->get($cachekey);
3644                 if (!is_null($result)) {
3645                         return $result;
3646                 }
3647
3648                 $myaddr = self::myHandle($owner);
3649
3650                 $public = ($item["private"] == Item::PRIVATE ? "false" : "true");
3651                 $created = DateTimeFormat::utc($item['received'], DateTimeFormat::ATOM);
3652                 $edited = DateTimeFormat::utc($item["edited"] ?? $item["created"], DateTimeFormat::ATOM);
3653
3654                 // Detect a share element and do a reshare
3655                 if (($item['private'] != Item::PRIVATE) && ($ret = self::isReshare($item["body"]))) {
3656                         $message = ["author" => $myaddr,
3657                                         "guid" => $item["guid"],
3658                                         "created_at" => $created,
3659                                         "root_author" => $ret["root_handle"],
3660                                         "root_guid" => $ret["root_guid"],
3661                                         "provider_display_name" => $item["app"],
3662                                         "public" => $public];
3663
3664                         $type = "reshare";
3665                 } else {
3666                         $title = $item["title"];
3667                         $body = $item["body"];
3668
3669                         // Fetch the title from an attached link - if there is one
3670                         if (empty($item["title"]) && DI::pConfig()->get($owner['uid'], 'system', 'attach_link_title')) {
3671                                 $page_data = BBCode::getAttachmentData($item['body']);
3672                                 if (!empty($page_data['type']) && !empty($page_data['title']) && ($page_data['type'] == 'link')) {
3673                                         $title = $page_data['title'];
3674                                 }
3675                         }
3676
3677                         if ($item['author-link'] != $item['owner-link']) {
3678                                 require_once 'mod/share.php';
3679                                 $body = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
3680                                         "", $item['created'], $item['plink']) . $body . '[/share]';
3681                         }
3682
3683                         // convert to markdown
3684                         $body = html_entity_decode(BBCode::toMarkdown($body));
3685
3686                         // Adding the title
3687                         if (strlen($title)) {
3688                                 $body = "### ".html_entity_decode($title)."\n\n".$body;
3689                         }
3690
3691                         if ($item["attach"]) {
3692                                 $cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item["attach"], $matches, PREG_SET_ORDER);
3693                                 if ($cnt) {
3694                                         $body .= "\n".DI::l10n()->t("Attachments:")."\n";
3695                                         foreach ($matches as $mtch) {
3696                                                 $body .= "[".$mtch[3]."](".$mtch[1].")\n";
3697                                         }
3698                                 }
3699                         }
3700
3701                         $location = [];
3702
3703                         if ($item["location"] != "")
3704                                 $location["address"] = $item["location"];
3705
3706                         if ($item["coord"] != "") {
3707                                 $coord = explode(" ", $item["coord"]);
3708                                 $location["lat"] = $coord[0];
3709                                 $location["lng"] = $coord[1];
3710                         }
3711
3712                         $message = ["author" => $myaddr,
3713                                         "guid" => $item["guid"],
3714                                         "created_at" => $created,
3715                                         "edited_at" => $edited,
3716                                         "public" => $public,
3717                                         "text" => $body,
3718                                         "provider_display_name" => $item["app"],
3719                                         "location" => $location];
3720
3721                         // Diaspora rejects messages when they contain a location without "lat" or "lng"
3722                         if (!isset($location["lat"]) || !isset($location["lng"])) {
3723                                 unset($message["location"]);
3724                         }
3725
3726                         if ($item['event-id'] > 0) {
3727                                 $event = self::buildEvent($item['event-id']);
3728                                 if (count($event)) {
3729                                         $message['event'] = $event;
3730
3731                                         if (!empty($event['location']['address']) &&
3732                                                 !empty($event['location']['lat']) &&
3733                                                 !empty($event['location']['lng'])) {
3734                                                 $message['location'] = $event['location'];
3735                                         }
3736
3737                                         /// @todo Once Diaspora supports it, we will remove the body and the location hack above
3738                                         // $message['text'] = '';
3739                                 }
3740                         }
3741
3742                         $type = "status_message";
3743                 }
3744
3745                 $msg = ["type" => $type, "message" => $message];
3746
3747                 DI::cache()->set($cachekey, $msg, Duration::QUARTER_HOUR);
3748
3749                 return $msg;
3750         }
3751
3752         private static function prependParentAuthorMention($body, $profile_url)
3753         {
3754                 $profile = Contact::getDetailsByURL($profile_url);
3755                 if (!empty($profile['addr'])
3756                         && $profile['contact-type'] != Contact::TYPE_COMMUNITY
3757                         && !strstr($body, $profile['addr'])
3758                         && !strstr($body, $profile_url)
3759                 ) {
3760                         $body = '@[url=' . $profile_url . ']' . $profile['name'] . '[/url] ' . $body;
3761                 }
3762
3763                 return $body;
3764         }
3765
3766         /**
3767          * Sends a post
3768          *
3769          * @param array $item         The item that will be exported
3770          * @param array $owner        the array of the item owner
3771          * @param array $contact      Target of the communication
3772          * @param bool  $public_batch Is it a public post?
3773          *
3774          * @return int The result of the transmission
3775          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3776          * @throws \ImagickException
3777          */
3778         public static function sendStatus(array $item, array $owner, array $contact, $public_batch = false)
3779         {
3780                 $status = self::buildStatus($item, $owner);
3781
3782                 return self::buildAndTransmit($owner, $contact, $status["type"], $status["message"], $public_batch, $item["guid"]);
3783         }
3784
3785         /**
3786          * Creates a "like" object
3787          *
3788          * @param array $item  The item that will be exported
3789          * @param array $owner the array of the item owner
3790          *
3791          * @return array The data for a "like"
3792          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3793          */
3794         private static function constructLike(array $item, array $owner)
3795         {
3796                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3797                 if (!DBA::isResult($parent)) {
3798                         return false;
3799                 }
3800
3801                 $target_type = ($parent["uri"] === $parent["parent-uri"] ? "Post" : "Comment");
3802                 $positive = null;
3803                 if ($item['verb'] === Activity::LIKE) {
3804                         $positive = "true";
3805                 } elseif ($item['verb'] === Activity::DISLIKE) {
3806                         $positive = "false";
3807                 }
3808
3809                 return(["author" => self::myHandle($owner),
3810                                 "guid" => $item["guid"],
3811                                 "parent_guid" => $parent["guid"],
3812                                 "parent_type" => $target_type,
3813                                 "positive" => $positive,
3814                                 "author_signature" => ""]);
3815         }
3816
3817         /**
3818          * Creates an "EventParticipation" object
3819          *
3820          * @param array $item  The item that will be exported
3821          * @param array $owner the array of the item owner
3822          *
3823          * @return array The data for an "EventParticipation"
3824          * @throws \Exception
3825          */
3826         private static function constructAttend(array $item, array $owner)
3827         {
3828                 $parent = Item::selectFirst(['guid', 'uri', 'parent-uri'], ['uri' => $item["thr-parent"]]);
3829                 if (!DBA::isResult($parent)) {
3830                         return false;
3831                 }
3832
3833                 switch ($item['verb']) {
3834                         case Activity::ATTEND:
3835                                 $attend_answer = 'accepted';
3836                                 break;
3837                         case Activity::ATTENDNO:
3838                                 $attend_answer = 'declined';
3839                                 break;
3840                         case Activity::ATTENDMAYBE:
3841                                 $attend_answer = 'tentative';
3842                                 break;
3843                         default:
3844                                 Logger::log('Unknown verb '.$item['verb'].' in item '.$item['guid']);
3845                                 return false;
3846                 }
3847
3848                 return(["author" => self::myHandle($owner),
3849                                 "guid" => $item["guid"],
3850                                 "parent_guid" => $parent["guid"],
3851                                 "status" => $attend_answer,
3852                                 "author_signature" => ""]);
3853         }
3854
3855         /**
3856          * Creates the object for a comment
3857          *
3858          * @param array $item  The item that will be exported
3859          * @param array $owner the array of the item owner
3860          *
3861          * @return array|false The data for a comment
3862          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3863          */
3864         private static function constructComment(array $item, array $owner)
3865         {
3866                 $cachekey = "diaspora:constructComment:".$item['guid'];
3867
3868                 $result = DI::cache()->get($cachekey);
3869                 if (!is_null($result)) {
3870                         return $result;
3871                 }
3872
3873                 $toplevel_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['id' => $item['parent'], 'parent' => $item['parent']]);
3874                 if (!DBA::isResult($toplevel_item)) {
3875                         Logger::error('Missing parent conversation item', ['parent' => $item['parent']]);
3876                         return false;
3877                 }
3878
3879                 $thread_parent_item = $toplevel_item;
3880                 if ($item['thr-parent'] != $item['parent-uri']) {
3881                         $thread_parent_item = Item::selectFirst(['guid', 'author-id', 'author-link'], ['uri' => $item['thr-parent'], 'uid' => $item['uid']]);
3882                 }
3883
3884                 $body = $item["body"];
3885
3886                 // The replied to autor mention is prepended for clarity if:
3887                 // - Item replied isn't yours
3888                 // - Item is public or explicit mentions are disabled
3889                 // - Implicit mentions are enabled
3890                 if (
3891                         $item['author-id'] != $thread_parent_item['author-id']
3892                         && (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions'))
3893                         && !DI::config()->get('system', 'disable_implicit_mentions')
3894                 ) {
3895                         $body = self::prependParentAuthorMention($body, $thread_parent_item['author-link']);
3896                 }
3897
3898                 $text = html_entity_decode(BBCode::toMarkdown($body));
3899                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
3900                 $edited = DateTimeFormat::utc($item["edited"], DateTimeFormat::ATOM);
3901
3902                 $comment = [
3903                         "author"      => self::myHandle($owner),
3904                         "guid"        => $item["guid"],
3905                         "created_at"  => $created,
3906                         "edited_at"   => $edited,
3907                         "parent_guid" => $toplevel_item["guid"],
3908                         "text"        => $text,
3909                         "author_signature" => ""
3910                 ];
3911
3912                 // Send the thread parent guid only if it is a threaded comment
3913                 if ($item['thr-parent'] != $item['parent-uri']) {
3914                         $comment['thread_parent_guid'] = $thread_parent_item['guid'];
3915                 }
3916
3917                 DI::cache()->set($cachekey, $comment, Duration::QUARTER_HOUR);
3918
3919                 return($comment);
3920         }
3921
3922         /**
3923          * Send a like or a comment
3924          *
3925          * @param array $item         The item that will be exported
3926          * @param array $owner        the array of the item owner
3927          * @param array $contact      Target of the communication
3928          * @param bool  $public_batch Is it a public post?
3929          *
3930          * @return int The result of the transmission
3931          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3932          * @throws \ImagickException
3933          */
3934         public static function sendFollowup(array $item, array $owner, array $contact, $public_batch = false)
3935         {
3936                 if (in_array($item['verb'], [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE])) {
3937                         $message = self::constructAttend($item, $owner);
3938                         $type = "event_participation";
3939                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3940                         $message = self::constructLike($item, $owner);
3941                         $type = "like";
3942                 } elseif (!in_array($item["verb"], [Activity::FOLLOW, Activity::TAG])) {
3943                         $message = self::constructComment($item, $owner);
3944                         $type = "comment";
3945                 }
3946
3947                 if (empty($message)) {
3948                         return false;
3949                 }
3950
3951                 $message["author_signature"] = self::signature($owner, $message);
3952
3953                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
3954         }
3955
3956         /**
3957          * Creates a message from a signature record entry
3958          *
3959          * @param array $item The item that will be exported
3960          * @return array The message
3961          */
3962         private static function messageFromSignature(array $item)
3963         {
3964                 // Split the signed text
3965                 $signed_parts = explode(";", $item['signed_text']);
3966
3967                 if ($item["deleted"]) {
3968                         $message = ["author" => $item['signer'],
3969                                         "target_guid" => $signed_parts[0],
3970                                         "target_type" => $signed_parts[1]];
3971                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
3972                         $message = ["author" => $signed_parts[4],
3973                                         "guid" => $signed_parts[1],
3974                                         "parent_guid" => $signed_parts[3],
3975                                         "parent_type" => $signed_parts[2],
3976                                         "positive" => $signed_parts[0],
3977                                         "author_signature" => $item['signature'],
3978                                         "parent_author_signature" => ""];
3979                 } else {
3980                         // Remove the comment guid
3981                         $guid = array_shift($signed_parts);
3982
3983                         // Remove the parent guid
3984                         $parent_guid = array_shift($signed_parts);
3985
3986                         // Remove the handle
3987                         $handle = array_pop($signed_parts);
3988
3989                         $message = [
3990                                 "author" => $handle,
3991                                 "guid" => $guid,
3992                                 "parent_guid" => $parent_guid,
3993                                 "text" => implode(";", $signed_parts),
3994                                 "author_signature" => $item['signature'],
3995                                 "parent_author_signature" => ""
3996                         ];
3997                 }
3998                 return $message;
3999         }
4000
4001         /**
4002          * Relays messages (like, comment, retraction) to other servers if we are the thread owner
4003          *
4004          * @param array $item         The item that will be exported
4005          * @param array $owner        the array of the item owner
4006          * @param array $contact      Target of the communication
4007          * @param bool  $public_batch Is it a public post?
4008          *
4009          * @return int The result of the transmission
4010          * @throws \Exception
4011          */
4012         public static function sendRelay(array $item, array $owner, array $contact, $public_batch = false)
4013         {
4014                 if ($item["deleted"]) {
4015                         return self::sendRetraction($item, $owner, $contact, $public_batch, true);
4016                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4017                         $type = "like";
4018                 } else {
4019                         $type = "comment";
4020                 }
4021
4022                 Logger::log("Got relayable data ".$type." for item ".$item["guid"]." (".$item["id"].")", Logger::DEBUG);
4023
4024                 $msg = json_decode($item['signed_text'], true);
4025
4026                 $message = [];
4027                 if (is_array($msg)) {
4028                         foreach ($msg as $field => $data) {
4029                                 if (!$item["deleted"]) {
4030                                         if ($field == "diaspora_handle") {
4031                                                 $field = "author";
4032                                         }
4033                                         if ($field == "target_type") {
4034                                                 $field = "parent_type";
4035                                         }
4036                                 }
4037
4038                                 $message[$field] = $data;
4039                         }
4040                 } else {
4041                         Logger::log("Signature text for item ".$item["guid"]." (".$item["id"].") couldn't be extracted: ".$item['signed_text'], Logger::DEBUG);
4042                 }
4043
4044                 $message["parent_author_signature"] = self::signature($owner, $message);
4045
4046                 Logger::log("Relayed data ".print_r($message, true), Logger::DEBUG);
4047
4048                 return self::buildAndTransmit($owner, $contact, $type, $message, $public_batch, $item["guid"]);
4049         }
4050
4051         /**
4052          * Sends a retraction (deletion) of a message, like or comment
4053          *
4054          * @param array $item         The item that will be exported
4055          * @param array $owner        the array of the item owner
4056          * @param array $contact      Target of the communication
4057          * @param bool  $public_batch Is it a public post?
4058          * @param bool  $relay        Is the retraction transmitted from a relay?
4059          *
4060          * @return int The result of the transmission
4061          * @throws \Exception
4062          */
4063         public static function sendRetraction(array $item, array $owner, array $contact, $public_batch = false, $relay = false)
4064         {
4065                 $itemaddr = self::handleFromContact($item["contact-id"], $item["author-id"]);
4066
4067                 $msg_type = "retraction";
4068
4069                 if ($item['gravity'] == GRAVITY_PARENT) {
4070                         $target_type = "Post";
4071                 } elseif (in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4072                         $target_type = "Like";
4073                 } else {
4074                         $target_type = "Comment";
4075                 }
4076
4077                 $message = ["author" => $itemaddr,
4078                                 "target_guid" => $item['guid'],
4079                                 "target_type" => $target_type];
4080
4081                 Logger::log("Got message ".print_r($message, true), Logger::DEBUG);
4082
4083                 return self::buildAndTransmit($owner, $contact, $msg_type, $message, $public_batch, $item["guid"]);
4084         }
4085
4086         /**
4087          * Sends a mail
4088          *
4089          * @param array $item    The item that will be exported
4090          * @param array $owner   The owner
4091          * @param array $contact Target of the communication
4092          *
4093          * @return int The result of the transmission
4094          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4095          * @throws \ImagickException
4096          */
4097         public static function sendMail(array $item, array $owner, array $contact)
4098         {
4099                 $myaddr = self::myHandle($owner);
4100
4101                 $cnv = DBA::selectFirst('conv', [], ['id' => $item["convid"], 'uid' => $item["uid"]]);
4102                 if (!DBA::isResult($cnv)) {
4103                         Logger::log("conversation not found.");
4104                         return;
4105                 }
4106
4107                 $body = BBCode::toMarkdown($item["body"]);
4108                 $created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
4109
4110                 $msg = [
4111                         "author" => $myaddr,
4112                         "guid" => $item["guid"],
4113                         "conversation_guid" => $cnv["guid"],
4114                         "text" => $body,
4115                         "created_at" => $created,
4116                 ];
4117
4118                 if ($item["reply"]) {
4119                         $message = $msg;
4120                         $type = "message";
4121                 } else {
4122                         $message = [
4123                                 "author" => $cnv["creator"],
4124                                 "guid" => $cnv["guid"],
4125                                 "subject" => $cnv["subject"],
4126                                 "created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
4127                                 "participants" => $cnv["recips"],
4128                                 "message" => $msg
4129                         ];
4130
4131                         $type = "conversation";
4132                 }
4133
4134                 return self::buildAndTransmit($owner, $contact, $type, $message, false, $item["guid"]);
4135         }
4136
4137         /**
4138          * Split a name into first name and last name
4139          *
4140          * @param string $name The name
4141          *
4142          * @return array The array with "first" and "last"
4143          */
4144         public static function splitName($name) {
4145                 $name = trim($name);
4146
4147                 // Is the name longer than 64 characters? Then cut the rest of it.
4148                 if (strlen($name) > 64) {
4149                         if ((strpos($name, ' ') <= 64) && (strpos($name, ' ') !== false)) {
4150                                 $name = trim(substr($name, 0, strrpos(substr($name, 0, 65), ' ')));
4151                         } else {
4152                                 $name = substr($name, 0, 64);
4153                         }
4154                 }
4155
4156                 // Take the first word as first name
4157                 $first = ((strpos($name, ' ') ? trim(substr($name, 0, strpos($name, ' '))) : $name));
4158                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4159                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4160                         return ['first' => $first, 'last' => $last];
4161                 }
4162
4163                 // Take the last word as last name
4164                 $first = ((strrpos($name, ' ') ? trim(substr($name, 0, strrpos($name, ' '))) : $name));
4165                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4166
4167                 if ((strlen($first) < 32) && (strlen($last) < 32)) {
4168                         return ['first' => $first, 'last' => $last];
4169                 }
4170
4171                 // Take the first 32 characters if there is no space in the first 32 characters
4172                 if ((strpos($name, ' ') > 32) || (strpos($name, ' ') === false)) {
4173                         $first = substr($name, 0, 32);
4174                         $last = substr($name, 32);
4175                         return ['first' => $first, 'last' => $last];
4176                 }
4177
4178                 $first = trim(substr($name, 0, strrpos(substr($name, 0, 33), ' ')));
4179                 $last = (($first === $name) ? '' : trim(substr($name, strlen($first))));
4180
4181                 // Check if the last name is longer than 32 characters
4182                 if (strlen($last) > 32) {
4183                         if (strpos($last, ' ') <= 32) {
4184                                 $last = trim(substr($last, 0, strrpos(substr($last, 0, 33), ' ')));
4185                         } else {
4186                                 $last = substr($last, 0, 32);
4187                         }
4188                 }
4189
4190                 return ['first' => $first, 'last' => $last];
4191         }
4192
4193         /**
4194          * Create profile data
4195          *
4196          * @param int $uid The user id
4197          *
4198          * @return array The profile data
4199          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
4200          */
4201         private static function createProfileData($uid)
4202         {
4203                 $profile = DBA::selectFirst('owner-view', ['uid', 'addr', 'name', 'location', 'net-publish', 'dob', 'about', 'pub_keywords'], ['uid' => $uid]);
4204                 if (!DBA::isResult($profile)) {
4205                         return [];
4206                 }
4207
4208                 $handle = $profile["addr"];
4209
4210                 $split_name = self::splitName($profile['name']);
4211                 $first = $split_name['first'];
4212                 $last = $split_name['last'];
4213
4214                 $large = DI::baseUrl().'/photo/custom/300/'.$profile['uid'].'.jpg';
4215                 $medium = DI::baseUrl().'/photo/custom/100/'.$profile['uid'].'.jpg';
4216                 $small = DI::baseUrl().'/photo/custom/50/'  .$profile['uid'].'.jpg';
4217                 $searchable = ($profile['net-publish'] ? 'true' : 'false');
4218
4219                 $dob = null;
4220                 $about = null;
4221                 $location = null;
4222                 $tags = null;
4223                 if ($searchable === 'true') {
4224                         $dob = '';
4225
4226                         if ($profile['dob'] && ($profile['dob'] > '0000-00-00')) {
4227                                 list($year, $month, $day) = sscanf($profile['dob'], '%4d-%2d-%2d');
4228                                 if ($year < 1004) {
4229                                         $year = 1004;
4230                                 }
4231                                 $dob = DateTimeFormat::utc($year . '-' . $month . '-'. $day, 'Y-m-d');
4232                         }
4233
4234                         $about = BBCode::toMarkdown($profile['about']);
4235
4236                         $location = $profile['location'];
4237                         $tags = '';
4238                         if ($profile['pub_keywords']) {
4239                                 $kw = str_replace(',', ' ', $profile['pub_keywords']);
4240                                 $kw = str_replace('  ', ' ', $kw);
4241                                 $arr = explode(' ', $kw);
4242                                 if (count($arr)) {
4243                                         for ($x = 0; $x < 5; $x ++) {
4244                                                 if (!empty($arr[$x])) {
4245                                                         $tags .= '#'. trim($arr[$x]) .' ';
4246                                                 }
4247                                         }
4248                                 }
4249                         }
4250                         $tags = trim($tags);
4251                 }
4252
4253                 return ["author" => $handle,
4254                                 "first_name" => $first,
4255                                 "last_name" => $last,
4256                                 "image_url" => $large,
4257                                 "image_url_medium" => $medium,
4258                                 "image_url_small" => $small,
4259                                 "birthday" => $dob,
4260                                 "bio" => $about,
4261                                 "location" => $location,
4262                                 "searchable" => $searchable,
4263                                 "nsfw" => "false",
4264                                 "tag_string" => $tags];
4265         }
4266
4267         /**
4268          * Sends profile data
4269          *
4270          * @param int  $uid    The user id
4271          * @param bool $recips optional, default false
4272          * @return void
4273          * @throws \Exception
4274          */
4275         public static function sendProfile($uid, $recips = false)
4276         {
4277                 if (!$uid) {
4278                         return;
4279                 }
4280
4281                 $owner = User::getOwnerDataById($uid);
4282                 if (!$owner) {
4283                         return;
4284                 }
4285
4286                 if (!$recips) {
4287                         $recips = q(
4288                                 "SELECT `id`,`name`,`network`,`pubkey`,`notify` FROM `contact` WHERE `network` = '%s'
4289                                 AND `uid` = %d AND `rel` != %d",
4290                                 DBA::escape(Protocol::DIASPORA),
4291                                 intval($uid),
4292                                 intval(Contact::SHARING)
4293                         );
4294                 }
4295
4296                 if (!$recips) {
4297                         return;
4298                 }
4299
4300                 $message = self::createProfileData($uid);
4301
4302                 // @ToDo Split this into single worker jobs
4303                 foreach ($recips as $recip) {
4304                         Logger::log("Send updated profile data for user ".$uid." to contact ".$recip["id"], Logger::DEBUG);
4305                         self::buildAndTransmit($owner, $recip, "profile", $message);
4306                 }
4307         }
4308
4309         /**
4310          * Creates the signature for likes that are created on our system
4311          *
4312          * @param integer $uid  The user of that comment
4313          * @param array   $item Item array
4314          *
4315          * @return array Signed content
4316          * @throws \Exception
4317          */
4318         public static function createLikeSignature($uid, array $item)
4319         {
4320                 $owner = User::getOwnerDataById($uid);
4321                 if (empty($owner)) {
4322                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4323                         return false;
4324                 }
4325
4326                 if (!in_array($item["verb"], [Activity::LIKE, Activity::DISLIKE])) {
4327                         return false;
4328                 }
4329
4330                 $message = self::constructLike($item, $owner);
4331                 if ($message === false) {
4332                         return false;
4333                 }
4334
4335                 $message["author_signature"] = self::signature($owner, $message);
4336
4337                 return $message;
4338         }
4339
4340         /**
4341          * Creates the signature for Comments that are created on our system
4342          *
4343          * @param integer $uid  The user of that comment
4344          * @param array   $item Item array
4345          *
4346          * @return array Signed content
4347          * @throws \Exception
4348          */
4349         public static function createCommentSignature($uid, array $item)
4350         {
4351                 $owner = User::getOwnerDataById($uid);
4352                 if (empty($owner)) {
4353                         Logger::log("No owner post, so not storing signature", Logger::DEBUG);
4354                         return false;
4355                 }
4356
4357                 // This is a workaround for the behaviour of the "insert" function, see mod/item.php
4358                 $item['thr-parent'] = $item['parent-uri'];
4359
4360                 $parent = Item::selectFirst(['parent-uri'], ['uri' => $item['parent-uri']]);
4361                 if (!DBA::isResult($parent)) {
4362                         return;
4363                 }
4364
4365                 $item['parent-uri'] = $parent['parent-uri'];
4366
4367                 $message = self::constructComment($item, $owner);
4368                 if ($message === false) {
4369                         return false;
4370                 }
4371
4372                 $message["author_signature"] = self::signature($owner, $message);
4373
4374                 return $message;
4375         }
4376 }