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