src/Protocol/DFRN.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 DOMDocument;
  25 use DOMXPath;
  26 use Friendica\App\BaseURL;
  27 use Friendica\Content\Text\BBCode;
  28 use Friendica\Core\Hook;
  29 use Friendica\Core\Logger;
  30 use Friendica\Core\Protocol;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\Contact;
  34 use Friendica\Model\Conversation;
  35 use Friendica\Model\Event;
  36 use Friendica\Model\GContact;
  37 use Friendica\Model\Item;
  38 use Friendica\Model\ItemURI;
  39 use Friendica\Model\Mail;
  40 use Friendica\Model\Notify\Type;
  41 use Friendica\Model\PermissionSet;
  42 use Friendica\Model\Profile;
  43 use Friendica\Model\Term;
  44 use Friendica\Model\User;
  45 use Friendica\Network\Probe;
  46 use Friendica\Util\Crypto;
  47 use Friendica\Util\DateTimeFormat;
  48 use Friendica\Util\Images;
  49 use Friendica\Util\Network;
  50 use Friendica\Util\Strings;
  51 use Friendica\Util\XML;
  52
  53 /**
  54  * This class contain functions to create and send DFRN XML files
  55  */
  56 class DFRN
  57 {
  58
  59         const TOP_LEVEL = 0;    // Top level posting
  60         const REPLY = 1;                // Regular reply that is stored locally
  61         const REPLY_RC = 2;     // Reply that will be relayed
  62
  63         /**
  64          * Generates an array of contact and user for DFRN imports
  65          *
  66          * This array contains not only the receiver but also the sender of the message.
  67          *
  68          * @param integer $cid Contact id
  69          * @param integer $uid User id
  70          *
  71          * @return array importer
  72          * @throws \Exception
  73          */
  74         public static function getImporter($cid, $uid = 0)
  75         {
  76                 $condition = ['id' => $cid, 'blocked' => false, 'pending' => false];
  77                 $contact = DBA::selectFirst('contact', [], $condition);
  78                 if (!DBA::isResult($contact)) {
  79                         return [];
  80                 }
  81
  82                 $contact['cpubkey'] = $contact['pubkey'];
  83                 $contact['cprvkey'] = $contact['prvkey'];
  84                 $contact['senderName'] = $contact['name'];
  85
  86                 if ($uid != 0) {
  87                         $condition = ['uid' => $uid, 'account_expired' => false, 'account_removed' => false];
  88                         $user = DBA::selectFirst('user', [], $condition);
  89                         if (!DBA::isResult($user)) {
  90                                 return [];
  91                         }
  92
  93                         $user['importer_uid'] = $user['uid'];
  94                         $user['uprvkey'] = $user['prvkey'];
  95                 } else {
  96                         $user = ['importer_uid' => 0, 'uprvkey' => '', 'timezone' => 'UTC',
  97                                 'nickname' => '', 'sprvkey' => '', 'spubkey' => '',
  98                                 'page-flags' => 0, 'account-type' => 0, 'prvnets' => 0];
  99                 }
 100
 101                 return array_merge($contact, $user);
 102         }
 103
 104         /**
 105          * Generates the atom entries for delivery.php
 106          *
 107          * This function is used whenever content is transmitted via DFRN.
 108          *
 109          * @param array $items Item elements
 110          * @param array $owner Owner record
 111          *
 112          * @return string DFRN entries
 113          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 114          * @throws \ImagickException
 115          * @todo  Find proper type-hints
 116          */
 117         public static function entries($items, $owner)
 118         {
 119                 $doc = new DOMDocument('1.0', 'utf-8');
 120                 $doc->formatOutput = true;
 121
 122                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 123
 124                 if (! count($items)) {
 125                         return trim($doc->saveXML());
 126                 }
 127
 128                 foreach ($items as $item) {
 129                         // These values aren't sent when sending from the queue.
 130                         /// @todo Check if we can set these values from the queue or if they are needed at all.
 131                         $item["entry:comment-allow"] = ($item["entry:comment-allow"] ?? '') ?: true;
 132                         $item["entry:cid"] = $item["entry:cid"] ?? 0;
 133
 134                         $entry = self::entry($doc, "text", $item, $owner, $item["entry:comment-allow"], $item["entry:cid"]);
 135                         if (isset($entry)) {
 136                                 $root->appendChild($entry);
 137                         }
 138                 }
 139
 140                 return trim($doc->saveXML());
 141         }
 142
 143         /**
 144          * Generate an atom feed for the given user
 145          *
 146          * This function is called when another server is pulling data from the user feed.
 147          *
 148          * @param string  $dfrn_id     DFRN ID from the requesting party
 149          * @param string  $owner_nick  Owner nick name
 150          * @param string  $last_update Date of the last update
 151          * @param int     $direction   Can be -1, 0 or 1.
 152          * @param boolean $onlyheader  Output only the header without content? (Default is "no")
 153          *
 154          * @return string DFRN feed entries
 155          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 156          * @throws \ImagickException
 157          */
 158         public static function feed($dfrn_id, $owner_nick, $last_update, $direction = 0, $onlyheader = false)
 159         {
 160                 $a = DI::app();
 161
 162                 $sitefeed    = ((strlen($owner_nick)) ? false : true); // not yet implemented, need to rewrite huge chunks of following logic
 163                 $public_feed = (($dfrn_id) ? false : true);
 164                 $starred     = false;   // not yet implemented, possible security issues
 165                 $converse    = false;
 166
 167                 if ($public_feed && $a->argc > 2) {
 168                         for ($x = 2; $x < $a->argc; $x++) {
 169                                 if ($a->argv[$x] == 'converse') {
 170                                         $converse = true;
 171                                 }
 172                                 if ($a->argv[$x] == 'starred') {
 173                                         $starred = true;
 174                                 }
 175                                 if ($a->argv[$x] == 'category' && $a->argc > ($x + 1) && strlen($a->argv[$x+1])) {
 176                                         $category = $a->argv[$x+1];
 177                                 }
 178                         }
 179                 }
 180
 181                 // default permissions - anonymous user
 182
 183                 $sql_extra = sprintf(" AND `item`.`private` != %s ", Item::PRIVATE);
 184
 185                 $r = q(
 186                         "SELECT `contact`.*, `user`.`nickname`, `user`.`timezone`, `user`.`page-flags`, `user`.`account-type`
 187                         FROM `contact` INNER JOIN `user` ON `user`.`uid` = `contact`.`uid`
 188                         WHERE `contact`.`self` AND `user`.`nickname` = '%s' LIMIT 1",
 189                         DBA::escape($owner_nick)
 190                 );
 191
 192                 if (! DBA::isResult($r)) {
 193                         Logger::log(sprintf('No contact found for nickname=%d', $owner_nick), Logger::WARNING);
 194                         exit();
 195                 }
 196
 197                 $owner = $r[0];
 198                 $owner_id = $owner['uid'];
 199
 200                 $sql_post_table = "";
 201
 202                 if (! $public_feed) {
 203                         switch ($direction) {
 204                                 case (-1):
 205                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 206                                         break;
 207                                 case 0:
 208                                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 209                                         break;
 210                                 case 1:
 211                                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 212                                         break;
 213                                 default:
 214                                         return false;
 215                                         break; // NOTREACHED
 216                         }
 217
 218                         $r = q(
 219                                 "SELECT * FROM `contact` WHERE NOT `blocked` AND `contact`.`uid` = %d $sql_extra LIMIT 1",
 220                                 intval($owner_id)
 221                         );
 222
 223                         if (! DBA::isResult($r)) {
 224                                 Logger::log(sprintf('No contact found for uid=%d', $owner_id), Logger::WARNING);
 225                                 exit();
 226                         }
 227
 228                         $contact = $r[0];
 229
 230                         $set = PermissionSet::get($owner_id, $contact['id']);
 231
 232                         if (!empty($set)) {
 233                                 $sql_extra = " AND `item`.`psid` IN (" . implode(',', $set) .")";
 234                         } else {
 235                                 $sql_extra = sprintf(" AND `item`.`private` != %s", Item::PRIVATE);
 236                         }
 237                 }
 238
 239                 if ($public_feed) {
 240                         $sort = 'DESC';
 241                 } else {
 242                         $sort = 'ASC';
 243                 }
 244
 245                 if (! strlen($last_update)) {
 246                         $last_update = 'now -30 days';
 247                 }
 248
 249                 if (isset($category)) {
 250                         $sql_post_table = sprintf(
 251                                 "INNER JOIN (SELECT `oid` FROM `term` WHERE `term` = '%s' AND `otype` = %d AND `type` = %d AND `uid` = %d ORDER BY `tid` DESC) AS `term` ON `item`.`id` = `term`.`oid` ",
 252                                 DBA::escape(Strings::protectSprintf($category)),
 253                                 intval(Term::OBJECT_TYPE_POST),
 254                                 intval(Term::CATEGORY),
 255                                 intval($owner_id)
 256                         );
 257                 }
 258
 259                 if ($public_feed && ! $converse) {
 260                         $sql_extra .= " AND `contact`.`self` = 1 ";
 261                 }
 262
 263                 $check_date = DateTimeFormat::utc($last_update);
 264
 265                 $r = q(
 266                         "SELECT `item`.`id`
 267                         FROM `item` USE INDEX (`uid_wall_changed`) $sql_post_table
 268                         STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
 269                         WHERE `item`.`uid` = %d AND `item`.`wall` AND `item`.`changed` > '%s'
 270                         AND `item`.`visible` $sql_extra
 271                         ORDER BY `item`.`parent` ".$sort.", `item`.`received` ASC LIMIT 0, 300",
 272                         intval($owner_id),
 273                         DBA::escape($check_date),
 274                         DBA::escape($sort)
 275                 );
 276
 277                 $ids = [];
 278                 foreach ($r as $item) {
 279                         $ids[] = $item['id'];
 280                 }
 281
 282                 if (!empty($ids)) {
 283                         $ret = Item::select(Item::DELIVER_FIELDLIST, ['id' => $ids]);
 284                         $items = Item::inArray($ret);
 285                 } else {
 286                         $items = [];
 287                 }
 288
 289                 /*
 290                  * Will check further below if this actually returned results.
 291                  * We will provide an empty feed if that is the case.
 292                  */
 293
 294                 $doc = new DOMDocument('1.0', 'utf-8');
 295                 $doc->formatOutput = true;
 296
 297                 $alternatelink = $owner['url'];
 298
 299                 if (isset($category)) {
 300                         $alternatelink .= "/category/".$category;
 301                 }
 302
 303                 if ($public_feed) {
 304                         $author = "dfrn:owner";
 305                 } else {
 306                         $author = "author";
 307                 }
 308
 309                 $root = self::addHeader($doc, $owner, $author, $alternatelink, true);
 310
 311                 /// @TODO This hook can't work anymore
 312                 //      \Friendica\Core\Hook::callAll('atom_feed', $atom);
 313
 314                 if (!DBA::isResult($items) || $onlyheader) {
 315                         $atom = trim($doc->saveXML());
 316
 317                         Hook::callAll('atom_feed_end', $atom);
 318
 319                         return $atom;
 320                 }
 321
 322                 foreach ($items as $item) {
 323                         // prevent private email from leaking.
 324                         if ($item['network'] == Protocol::MAIL) {
 325                                 continue;
 326                         }
 327
 328                         // public feeds get html, our own nodes use bbcode
 329
 330                         if ($public_feed) {
 331                                 $type = 'html';
 332                                 // catch any email that's in a public conversation and make sure it doesn't leak
 333                                 if ($item['private'] == Item::PRIVATE) {
 334                                         continue;
 335                                 }
 336                         } else {
 337                                 $type = 'text';
 338                         }
 339
 340                         $entry = self::entry($doc, $type, $item, $owner, true);
 341                         if (isset($entry)) {
 342                                 $root->appendChild($entry);
 343                         }
 344                 }
 345
 346                 $atom = trim($doc->saveXML());
 347
 348                 Hook::callAll('atom_feed_end', $atom);
 349
 350                 return $atom;
 351         }
 352
 353         /**
 354          * Generate an atom entry for a given item id
 355          *
 356          * @param int     $item_id      The item id
 357          * @param boolean $conversation Show the conversation. If false show the single post.
 358          *
 359          * @return string DFRN feed entry
 360          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 361          * @throws \ImagickException
 362          */
 363         public static function itemFeed($item_id, $conversation = false)
 364         {
 365                 if ($conversation) {
 366                         $condition = ['parent' => $item_id];
 367                 } else {
 368                         $condition = ['id' => $item_id];
 369                 }
 370
 371                 $ret = Item::select(Item::DELIVER_FIELDLIST, $condition);
 372                 $items = Item::inArray($ret);
 373                 if (!DBA::isResult($items)) {
 374                         return '';
 375                 }
 376
 377                 $item = $items[0];
 378
 379                 if ($item['uid'] != 0) {
 380                         $owner = User::getOwnerDataById($item['uid']);
 381                         if (!$owner) {
 382                                 return '';
 383                         }
 384                 } else {
 385                         $owner = ['uid' => 0, 'nick' => 'feed-item'];
 386                 }
 387
 388                 $doc = new DOMDocument('1.0', 'utf-8');
 389                 $doc->formatOutput = true;
 390                 $type = 'html';
 391
 392                 if ($conversation) {
 393                         $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 394                         $doc->appendChild($root);
 395
 396                         $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 397                         $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 398                         $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 399                         $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 400                         $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 401                         $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 402                         $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 403                         $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 404                         $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 405
 406                         //$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 407
 408                         foreach ($items as $item) {
 409                                 $entry = self::entry($doc, $type, $item, $owner, true, 0);
 410                                 if (isset($entry)) {
 411                                         $root->appendChild($entry);
 412                                 }
 413                         }
 414                 } else {
 415                         self::entry($doc, $type, $item, $owner, true, 0, true);
 416                 }
 417
 418                 $atom = trim($doc->saveXML());
 419                 return $atom;
 420         }
 421
 422         /**
 423          * Create XML text for DFRN mails
 424          *
 425          * @param array $item  message elements
 426          * @param array $owner Owner record
 427          *
 428          * @return string DFRN mail
 429          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 430          * @todo  Find proper type-hints
 431          */
 432         public static function mail($item, $owner)
 433         {
 434                 $doc = new DOMDocument('1.0', 'utf-8');
 435                 $doc->formatOutput = true;
 436
 437                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 438
 439                 $mail = $doc->createElement("dfrn:mail");
 440                 $sender = $doc->createElement("dfrn:sender");
 441
 442                 XML::addElement($doc, $sender, "dfrn:name", $owner['name']);
 443                 XML::addElement($doc, $sender, "dfrn:uri", $owner['url']);
 444                 XML::addElement($doc, $sender, "dfrn:avatar", $owner['thumb']);
 445
 446                 $mail->appendChild($sender);
 447
 448                 XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 449                 XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
 450                 XML::addElement($doc, $mail, "dfrn:sentdate", DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
 451                 XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 452                 XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 453
 454                 $root->appendChild($mail);
 455
 456                 return trim($doc->saveXML());
 457         }
 458
 459         /**
 460          * Create XML text for DFRN friend suggestions
 461          *
 462          * @param array $item  suggestion elements
 463          * @param array $owner Owner record
 464          *
 465          * @return string DFRN suggestions
 466          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 467          * @todo  Find proper type-hints
 468          */
 469         public static function fsuggest($item, $owner)
 470         {
 471                 $doc = new DOMDocument('1.0', 'utf-8');
 472                 $doc->formatOutput = true;
 473
 474                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 475
 476                 $suggest = $doc->createElement("dfrn:suggest");
 477
 478                 XML::addElement($doc, $suggest, "dfrn:url", $item['url']);
 479                 XML::addElement($doc, $suggest, "dfrn:name", $item['name']);
 480                 XML::addElement($doc, $suggest, "dfrn:photo", $item['photo']);
 481                 XML::addElement($doc, $suggest, "dfrn:request", $item['request']);
 482                 XML::addElement($doc, $suggest, "dfrn:note", $item['note']);
 483
 484                 $root->appendChild($suggest);
 485
 486                 return trim($doc->saveXML());
 487         }
 488
 489         /**
 490          * Create XML text for DFRN relocations
 491          *
 492          * @param array $owner Owner record
 493          * @param int   $uid   User ID
 494          *
 495          * @return string DFRN relocations
 496          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 497          * @todo  Find proper type-hints
 498          */
 499         public static function relocate($owner, $uid)
 500         {
 501
 502                 /* get site pubkey. this could be a new installation with no site keys*/
 503                 $pubkey = DI::config()->get('system', 'site_pubkey');
 504                 if (! $pubkey) {
 505                         $res = Crypto::newKeypair(1024);
 506                         DI::config()->set('system', 'site_prvkey', $res['prvkey']);
 507                         DI::config()->set('system', 'site_pubkey', $res['pubkey']);
 508                 }
 509
 510                 $rp = q(
 511                         "SELECT `resource-id` , `scale`, type FROM `photo`
 512                                 WHERE `profile` = 1 AND `uid` = %d ORDER BY scale;",
 513                         $uid
 514                 );
 515                 $photos = [];
 516                 $ext = Images::supportedTypes();
 517
 518                 foreach ($rp as $p) {
 519                         $photos[$p['scale']] = DI::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
 520                 }
 521
 522
 523                 $doc = new DOMDocument('1.0', 'utf-8');
 524                 $doc->formatOutput = true;
 525
 526                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 527
 528                 $relocate = $doc->createElement("dfrn:relocate");
 529
 530                 XML::addElement($doc, $relocate, "dfrn:url", $owner['url']);
 531                 XML::addElement($doc, $relocate, "dfrn:name", $owner['name']);
 532                 XML::addElement($doc, $relocate, "dfrn:addr", $owner['addr']);
 533                 XML::addElement($doc, $relocate, "dfrn:avatar", $owner['avatar']);
 534                 XML::addElement($doc, $relocate, "dfrn:photo", $photos[4]);
 535                 XML::addElement($doc, $relocate, "dfrn:thumb", $photos[5]);
 536                 XML::addElement($doc, $relocate, "dfrn:micro", $photos[6]);
 537                 XML::addElement($doc, $relocate, "dfrn:request", $owner['request']);
 538                 XML::addElement($doc, $relocate, "dfrn:confirm", $owner['confirm']);
 539                 XML::addElement($doc, $relocate, "dfrn:notify", $owner['notify']);
 540                 XML::addElement($doc, $relocate, "dfrn:poll", $owner['poll']);
 541                 XML::addElement($doc, $relocate, "dfrn:sitepubkey", DI::config()->get('system', 'site_pubkey'));
 542
 543                 $root->appendChild($relocate);
 544
 545                 return trim($doc->saveXML());
 546         }
 547
 548         /**
 549          * Adds the header elements for the DFRN protocol
 550          *
 551          * @param DOMDocument $doc           XML document
 552          * @param array       $owner         Owner record
 553          * @param string      $authorelement Element name for the author
 554          * @param string      $alternatelink link to profile or category
 555          * @param bool        $public        Is it a header for public posts?
 556          *
 557          * @return object XML root object
 558          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 559          * @todo  Find proper type-hints
 560          */
 561         private static function addHeader(DOMDocument $doc, $owner, $authorelement, $alternatelink = "", $public = false)
 562         {
 563
 564                 if ($alternatelink == "") {
 565                         $alternatelink = $owner['url'];
 566                 }
 567
 568                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 569                 $doc->appendChild($root);
 570
 571                 $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 572                 $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 573                 $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 574                 $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 575                 $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 576                 $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 577                 $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 578                 $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 579                 $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 580
 581                 XML::addElement($doc, $root, "id", DI::baseUrl()."/profile/".$owner["nick"]);
 582                 XML::addElement($doc, $root, "title", $owner["name"]);
 583
 584                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION];
 585                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 586
 587                 $attributes = ["rel" => "license", "href" => "http://creativecommons.org/licenses/by/3.0/"];
 588                 XML::addElement($doc, $root, "link", "", $attributes);
 589
 590                 $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $alternatelink];
 591                 XML::addElement($doc, $root, "link", "", $attributes);
 592
 593
 594                 if ($public) {
 595                         // DFRN itself doesn't uses this. But maybe someone else wants to subscribe to the public feed.
 596                         OStatus::hublinks($doc, $root, $owner["nick"]);
 597
 598                         $attributes = ["rel" => "salmon", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 599                         XML::addElement($doc, $root, "link", "", $attributes);
 600
 601                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-replies", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 602                         XML::addElement($doc, $root, "link", "", $attributes);
 603
 604                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-mention", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 605                         XML::addElement($doc, $root, "link", "", $attributes);
 606                 }
 607
 608                 // For backward compatibility we keep this element
 609                 if ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
 610                         XML::addElement($doc, $root, "dfrn:community", 1);
 611                 }
 612
 613                 // The former element is replaced by this one
 614                 XML::addElement($doc, $root, "dfrn:account_type", $owner["account-type"]);
 615
 616                 /// @todo We need a way to transmit the different page flags like "User::PAGE_FLAGS_PRVGROUP"
 617
 618                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 619
 620                 $author = self::addAuthor($doc, $owner, $authorelement, $public);
 621                 $root->appendChild($author);
 622
 623                 return $root;
 624         }
 625
 626         /**
 627          * Adds the author element in the header for the DFRN protocol
 628          *
 629          * @param DOMDocument $doc           XML document
 630          * @param array       $owner         Owner record
 631          * @param string      $authorelement Element name for the author
 632          * @param boolean     $public        boolean
 633          *
 634          * @return \DOMElement XML author object
 635          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 636          * @todo  Find proper type-hints
 637          */
 638         private static function addAuthor(DOMDocument $doc, array $owner, $authorelement, $public)
 639         {
 640                 // Should the profile be "unsearchable" in the net? Then add the "hide" element
 641                 $hide = DBA::exists('profile', ['uid' => $owner['uid'], 'net-publish' => false]);
 642
 643                 $author = $doc->createElement($authorelement);
 644
 645                 $namdate = DateTimeFormat::utc($owner['name-date'].'+00:00', DateTimeFormat::ATOM);
 646                 $picdate = DateTimeFormat::utc($owner['avatar-date'].'+00:00', DateTimeFormat::ATOM);
 647
 648                 $attributes = [];
 649
 650                 if (!$public || !$hide) {
 651                         $attributes = ["dfrn:updated" => $namdate];
 652                 }
 653
 654                 XML::addElement($doc, $author, "name", $owner["name"], $attributes);
 655                 XML::addElement($doc, $author, "uri", DI::baseUrl().'/profile/'.$owner["nickname"], $attributes);
 656                 XML::addElement($doc, $author, "dfrn:handle", $owner["addr"], $attributes);
 657
 658                 $attributes = ["rel" => "photo", "type" => "image/jpeg",
 659                                         "media:width" => 300, "media:height" => 300, "href" => $owner['photo']];
 660
 661                 if (!$public || !$hide) {
 662                         $attributes["dfrn:updated"] = $picdate;
 663                 }
 664
 665                 XML::addElement($doc, $author, "link", "", $attributes);
 666
 667                 $attributes["rel"] = "avatar";
 668                 XML::addElement($doc, $author, "link", "", $attributes);
 669
 670                 if ($hide) {
 671                         XML::addElement($doc, $author, "dfrn:hide", "true");
 672                 }
 673
 674                 // The following fields will only be generated if the data isn't meant for a public feed
 675                 if ($public) {
 676                         return $author;
 677                 }
 678
 679                 $birthday = feed_birthday($owner['uid'], $owner['timezone']);
 680
 681                 if ($birthday) {
 682                         XML::addElement($doc, $author, "dfrn:birthday", $birthday);
 683                 }
 684
 685                 // Only show contact details when we are allowed to
 686                 $r = q(
 687                         "SELECT `profile`.`about`, `profile`.`name`, `profile`.`homepage`, `user`.`nickname`,
 688                                 `user`.`timezone`, `profile`.`locality`, `profile`.`region`, `profile`.`country-name`,
 689                                 `profile`.`pub_keywords`, `profile`.`xmpp`, `profile`.`dob`
 690                         FROM `profile`
 691                                 INNER JOIN `user` ON `user`.`uid` = `profile`.`uid`
 692                                 WHERE NOT `user`.`hidewall` AND `user`.`uid` = %d",
 693                         intval($owner['uid'])
 694                 );
 695                 if (DBA::isResult($r)) {
 696                         $profile = $r[0];
 697
 698                         XML::addElement($doc, $author, "poco:displayName", $profile["name"]);
 699                         XML::addElement($doc, $author, "poco:updated", $namdate);
 700
 701                         if (trim($profile["dob"]) > DBA::NULL_DATE) {
 702                                 XML::addElement($doc, $author, "poco:birthday", "0000-".date("m-d", strtotime($profile["dob"])));
 703                         }
 704
 705                         XML::addElement($doc, $author, "poco:note", $profile["about"]);
 706                         XML::addElement($doc, $author, "poco:preferredUsername", $profile["nickname"]);
 707
 708                         $savetz = date_default_timezone_get();
 709                         date_default_timezone_set($profile["timezone"]);
 710                         XML::addElement($doc, $author, "poco:utcOffset", date("P"));
 711                         date_default_timezone_set($savetz);
 712
 713                         if (trim($profile["homepage"]) != "") {
 714                                 $urls = $doc->createElement("poco:urls");
 715                                 XML::addElement($doc, $urls, "poco:type", "homepage");
 716                                 XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
 717                                 XML::addElement($doc, $urls, "poco:primary", "true");
 718                                 $author->appendChild($urls);
 719                         }
 720
 721                         if (trim($profile["pub_keywords"]) != "") {
 722                                 $keywords = explode(",", $profile["pub_keywords"]);
 723
 724                                 foreach ($keywords as $keyword) {
 725                                         XML::addElement($doc, $author, "poco:tags", trim($keyword));
 726                                 }
 727                         }
 728
 729                         if (trim($profile["xmpp"]) != "") {
 730                                 $ims = $doc->createElement("poco:ims");
 731                                 XML::addElement($doc, $ims, "poco:type", "xmpp");
 732                                 XML::addElement($doc, $ims, "poco:value", $profile["xmpp"]);
 733                                 XML::addElement($doc, $ims, "poco:primary", "true");
 734                                 $author->appendChild($ims);
 735                         }
 736
 737                         if (trim($profile["locality"].$profile["region"].$profile["country-name"]) != "") {
 738                                 $element = $doc->createElement("poco:address");
 739
 740                                 XML::addElement($doc, $element, "poco:formatted", Profile::formatLocation($profile));
 741
 742                                 if (trim($profile["locality"]) != "") {
 743                                         XML::addElement($doc, $element, "poco:locality", $profile["locality"]);
 744                                 }
 745
 746                                 if (trim($profile["region"]) != "") {
 747                                         XML::addElement($doc, $element, "poco:region", $profile["region"]);
 748                                 }
 749
 750                                 if (trim($profile["country-name"]) != "") {
 751                                         XML::addElement($doc, $element, "poco:country", $profile["country-name"]);
 752                                 }
 753
 754                                 $author->appendChild($element);
 755                         }
 756                 }
 757
 758                 return $author;
 759         }
 760
 761         /**
 762          * Adds the author elements in the "entry" elements of the DFRN protocol
 763          *
 764          * @param DOMDocument $doc         XML document
 765          * @param string $element     Element name for the author
 766          * @param string $contact_url Link of the contact
 767          * @param array  $item        Item elements
 768          *
 769          * @return \DOMElement XML author object
 770          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 771          * @todo  Find proper type-hints
 772          */
 773         private static function addEntryAuthor(DOMDocument $doc, $element, $contact_url, $item)
 774         {
 775                 $author = $doc->createElement($element);
 776
 777                 $contact = Contact::getDetailsByURL($contact_url, $item["uid"]);
 778                 if (!empty($contact)) {
 779                         XML::addElement($doc, $author, "name", $contact["name"]);
 780                         XML::addElement($doc, $author, "uri", $contact["url"]);
 781                         XML::addElement($doc, $author, "dfrn:handle", $contact["addr"]);
 782
 783                         /// @Todo
 784                         /// - Check real image type and image size
 785                         /// - Check which of these boths elements we should use
 786                         $attributes = [
 787                                 "rel" => "photo",
 788                                 "type" => "image/jpeg",
 789                                 "media:width" => 80,
 790                                 "media:height" => 80,
 791                                 "href" => $contact["photo"]];
 792                         XML::addElement($doc, $author, "link", "", $attributes);
 793
 794                         $attributes = [
 795                                 "rel" => "avatar",
 796                                 "type" => "image/jpeg",
 797                                 "media:width" => 80,
 798                                 "media:height" => 80,
 799                                 "href" => $contact["photo"]];
 800                         XML::addElement($doc, $author, "link", "", $attributes);
 801                 }
 802
 803                 return $author;
 804         }
 805
 806         /**
 807          * Adds the activity elements
 808          *
 809          * @param DOMDocument $doc      XML document
 810          * @param string      $element  Element name for the activity
 811          * @param string      $activity activity value
 812          *
 813          * @return \DOMElement XML activity object
 814          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 815          * @todo  Find proper type-hints
 816          */
 817         private static function createActivity(DOMDocument $doc, $element, $activity)
 818         {
 819                 if ($activity) {
 820                         $entry = $doc->createElement($element);
 821
 822                         $r = XML::parseString($activity, false);
 823                         if (!$r) {
 824                                 return false;
 825                         }
 826
 827                         if ($r->type) {
 828                                 XML::addElement($doc, $entry, "activity:object-type", $r->type);
 829                         }
 830
 831                         if ($r->id) {
 832                                 XML::addElement($doc, $entry, "id", $r->id);
 833                         }
 834
 835                         if ($r->title) {
 836                                 XML::addElement($doc, $entry, "title", $r->title);
 837                         }
 838
 839                         if ($r->link) {
 840                                 if (substr($r->link, 0, 1) == '<') {
 841                                         if (strstr($r->link, '&') && (! strstr($r->link, '&amp;'))) {
 842                                                 $r->link = str_replace('&', '&amp;', $r->link);
 843                                         }
 844
 845                                         $r->link = preg_replace('/\<link(.*?)\"\>/', '<link$1"/>', $r->link);
 846
 847                                         // XML does need a single element as root element so we add a dummy element here
 848                                         $data = XML::parseString("<dummy>" . $r->link . "</dummy>", false);
 849                                         if (is_object($data)) {
 850                                                 foreach ($data->link as $link) {
 851                                                         $attributes = [];
 852                                                         foreach ($link->attributes() as $parameter => $value) {
 853                                                                 $attributes[$parameter] = $value;
 854                                                         }
 855                                                         XML::addElement($doc, $entry, "link", "", $attributes);
 856                                                 }
 857                                         }
 858                                 } else {
 859                                         $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $r->link];
 860                                         XML::addElement($doc, $entry, "link", "", $attributes);
 861                                 }
 862                         }
 863                         if ($r->content) {
 864                                 XML::addElement($doc, $entry, "content", BBCode::convert($r->content), ["type" => "html"]);
 865                         }
 866
 867                         return $entry;
 868                 }
 869
 870                 return false;
 871         }
 872
 873         /**
 874          * Adds the elements for attachments
 875          *
 876          * @param object $doc  XML document
 877          * @param object $root XML root
 878          * @param array  $item Item element
 879          *
 880          * @return void XML attachment object
 881          * @todo  Find proper type-hints
 882          */
 883         private static function getAttachment($doc, $root, $item)
 884         {
 885                 $arr = explode('[/attach],', $item['attach']);
 886                 if (count($arr)) {
 887                         foreach ($arr as $r) {
 888                                 $matches = false;
 889                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 890                                 if ($cnt) {
 891                                         $attributes = ["rel" => "enclosure",
 892                                                         "href" => $matches[1],
 893                                                         "type" => $matches[3]];
 894
 895                                         if (intval($matches[2])) {
 896                                                 $attributes["length"] = intval($matches[2]);
 897                                         }
 898
 899                                         if (trim($matches[4]) != "") {
 900                                                 $attributes["title"] = trim($matches[4]);
 901                                         }
 902
 903                                         XML::addElement($doc, $root, "link", "", $attributes);
 904                                 }
 905                         }
 906                 }
 907         }
 908
 909         /**
 910          * Adds the "entry" elements for the DFRN protocol
 911          *
 912          * @param DOMDocument $doc     XML document
 913          * @param string      $type    "text" or "html"
 914          * @param array       $item    Item element
 915          * @param array       $owner   Owner record
 916          * @param bool        $comment Trigger the sending of the "comment" element
 917          * @param int         $cid     Contact ID of the recipient
 918          * @param bool        $single  If set, the entry is created as an XML document with a single "entry" element
 919          *
 920          * @return null|\DOMElement XML entry object
 921          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 922          * @throws \ImagickException
 923          * @todo  Find proper type-hints
 924          */
 925         private static function entry(DOMDocument $doc, $type, array $item, array $owner, $comment = false, $cid = 0, $single = false)
 926         {
 927                 $mentioned = [];
 928
 929                 if (!$item['parent']) {
 930                         Logger::notice('Item without parent found.', ['type' => $type, 'item' => $item]);
 931                         return null;
 932                 }
 933
 934                 if ($item['deleted']) {
 935                         $attributes = ["ref" => $item['uri'], "when" => DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM)];
 936                         return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 937                 }
 938
 939                 if (!$single) {
 940                         $entry = $doc->createElement("entry");
 941                 } else {
 942                         $entry = $doc->createElementNS(ActivityNamespace::ATOM1, 'entry');
 943                         $doc->appendChild($entry);
 944
 945                         $entry->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 946                         $entry->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 947                         $entry->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 948                         $entry->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 949                         $entry->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 950                         $entry->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 951                         $entry->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 952                         $entry->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 953                         $entry->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 954                 }
 955
 956                 if ($item['private'] == Item::PRIVATE) {
 957                         $body = Item::fixPrivatePhotos($item['body'], $owner['uid'], $item, $cid);
 958                 } else {
 959                         $body = $item['body'];
 960                 }
 961
 962                 // Remove the abstract element. It is only locally important.
 963                 $body = BBCode::stripAbstract($body);
 964
 965                 $htmlbody = '';
 966                 if ($type == 'html') {
 967                         $htmlbody = $body;
 968
 969                         if ($item['title'] != "") {
 970                                 $htmlbody = "[b]" . $item['title'] . "[/b]\n\n" . $htmlbody;
 971                         }
 972
 973                         $htmlbody = BBCode::convert($htmlbody, false, 7);
 974                 }
 975
 976                 $author = self::addEntryAuthor($doc, "author", $item["author-link"], $item);
 977                 $entry->appendChild($author);
 978
 979                 $dfrnowner = self::addEntryAuthor($doc, "dfrn:owner", $item["owner-link"], $item);
 980                 $entry->appendChild($dfrnowner);
 981
 982                 if (($item['parent'] != $item['id']) || ($item['parent-uri'] !== $item['uri']) || (($item['thr-parent'] !== '') && ($item['thr-parent'] !== $item['uri']))) {
 983                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 984                         $parent = Item::selectFirst(['guid', 'plink'], ['uri' => $parent_item, 'uid' => $item['uid']]);
 985                         $attributes = ["ref" => $parent_item, "type" => "text/html",
 986                                                 "href" => $parent['plink'],
 987                                                 "dfrn:diaspora_guid" => $parent['guid']];
 988                         XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 989                 }
 990
 991                 // Add conversation data. This is used for OStatus
 992                 $conversation_href = DI::baseUrl()."/display/".$item["parent-guid"];
 993                 $conversation_uri = $conversation_href;
 994
 995                 if (isset($parent_item)) {
 996                         $conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $item['parent-uri']]);
 997                         if (DBA::isResult($conversation)) {
 998                                 if ($conversation['conversation-uri'] != '') {
 999                                         $conversation_uri = $conversation['conversation-uri'];
1000                                 }
1001                                 if ($conversation['conversation-href'] != '') {
1002                                         $conversation_href = $conversation['conversation-href'];
1003                                 }
1004                         }
1005                 }
1006
1007                 $attributes = [
1008                                 "href" => $conversation_href,
1009                                 "ref" => $conversation_uri];
1010
1011                 XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
1012
1013                 XML::addElement($doc, $entry, "id", $item["uri"]);
1014                 XML::addElement($doc, $entry, "title", $item["title"]);
1015
1016                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"] . "+00:00", DateTimeFormat::ATOM));
1017                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"] . "+00:00", DateTimeFormat::ATOM));
1018
1019                 // "dfrn:env" is used to read the content
1020                 XML::addElement($doc, $entry, "dfrn:env", Strings::base64UrlEncode($body, true));
1021
1022                 // The "content" field is not read by the receiver. We could remove it when the type is "text"
1023                 // We keep it at the moment, maybe there is some old version that doesn't read "dfrn:env"
1024                 XML::addElement($doc, $entry, "content", (($type == 'html') ? $htmlbody : $body), ["type" => $type]);
1025
1026                 // We save this value in "plink". Maybe we should read it from there as well?
1027                 XML::addElement(
1028                         $doc,
1029                         $entry,
1030                         "link",
1031                         "",
1032                         ["rel" => "alternate", "type" => "text/html",
1033                                  "href" => DI::baseUrl() . "/display/" . $item["guid"]]
1034                 );
1035
1036                 // "comment-allow" is some old fashioned stuff for old Friendica versions.
1037                 // It is included in the rewritten code for completeness
1038                 if ($comment) {
1039                         XML::addElement($doc, $entry, "dfrn:comment-allow", 1);
1040                 }
1041
1042                 if ($item['location']) {
1043                         XML::addElement($doc, $entry, "dfrn:location", $item['location']);
1044                 }
1045
1046                 if ($item['coord']) {
1047                         XML::addElement($doc, $entry, "georss:point", $item['coord']);
1048                 }
1049
1050                 if ($item['private']) {
1051                         // Friendica versions prior to 2020.3 can't handle "unlisted" properly. So we can only transmit public and private
1052                         XML::addElement($doc, $entry, "dfrn:private", ($item['private'] == Item::PRIVATE ? Item::PRIVATE : Item::PUBLIC));
1053                         XML::addElement($doc, $entry, "dfrn:unlisted", $item['private'] == Item::UNLISTED);
1054                 }
1055
1056                 if ($item['extid']) {
1057                         XML::addElement($doc, $entry, "dfrn:extid", $item['extid']);
1058                 }
1059
1060                 if ($item['post-type'] == Item::PT_PAGE) {
1061                         XML::addElement($doc, $entry, "dfrn:bookmark", "true");
1062                 }
1063
1064                 if ($item['app']) {
1065                         XML::addElement($doc, $entry, "statusnet:notice_info", "", ["local_id" => $item['id'], "source" => $item['app']]);
1066                 }
1067
1068                 XML::addElement($doc, $entry, "dfrn:diaspora_guid", $item["guid"]);
1069
1070                 // The signed text contains the content in Markdown, the sender handle and the signatur for the content
1071                 // It is needed for relayed comments to Diaspora.
1072                 if ($item['signed_text']) {
1073                         $sign = base64_encode(json_encode(['signed_text' => $item['signed_text'],'signature' => $item['signature'],'signer' => $item['signer']]));
1074                         XML::addElement($doc, $entry, "dfrn:diaspora_signature", $sign);
1075                 }
1076
1077                 XML::addElement($doc, $entry, "activity:verb", self::constructVerb($item));
1078
1079                 if ($item['object-type'] != "") {
1080                         XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
1081                 } elseif ($item['id'] == $item['parent']) {
1082                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::NOTE);
1083                 } else {
1084                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::COMMENT);
1085                 }
1086
1087                 $actobj = self::createActivity($doc, "activity:object", $item['object']);
1088                 if ($actobj) {
1089                         $entry->appendChild($actobj);
1090                 }
1091
1092                 $actarg = self::createActivity($doc, "activity:target", $item['target']);
1093                 if ($actarg) {
1094                         $entry->appendChild($actarg);
1095                 }
1096
1097                 $tags = Item::getFeedTags($item);
1098
1099                 /// @TODO Combine this with similar below if() block?
1100                 if (count($tags)) {
1101                         foreach ($tags as $t) {
1102                                 if (($type != 'html') || ($t[0] != "@")) {
1103                                         XML::addElement($doc, $entry, "category", "", ["scheme" => "X-DFRN:".$t[0].":".$t[1], "term" => $t[2]]);
1104                                 }
1105                         }
1106                 }
1107
1108                 if (count($tags)) {
1109                         foreach ($tags as $t) {
1110                                 if ($t[0] == "@") {
1111                                         $mentioned[$t[1]] = $t[1];
1112                                 }
1113                         }
1114                 }
1115
1116                 foreach ($mentioned as $mention) {
1117                         $condition = ['uid' => $owner["uid"], 'nurl' => Strings::normaliseLink($mention)];
1118                         $contact = DBA::selectFirst('contact', ['forum', 'prv'], $condition);
1119
1120                         if (DBA::isResult($contact) && ($contact["forum"] || $contact["prv"])) {
1121                                 XML::addElement(
1122                                         $doc,
1123                                         $entry,
1124                                         "link",
1125                                         "",
1126                                         ["rel" => "mentioned",
1127                                                         "ostatus:object-type" => Activity\ObjectType::GROUP,
1128                                                         "href" => $mention]
1129                                 );
1130                         } else {
1131                                 XML::addElement(
1132                                         $doc,
1133                                         $entry,
1134                                         "link",
1135                                         "",
1136                                         ["rel" => "mentioned",
1137                                                         "ostatus:object-type" => Activity\ObjectType::PERSON,
1138                                                         "href" => $mention]
1139                                 );
1140                         }
1141                 }
1142
1143                 self::getAttachment($doc, $entry, $item);
1144
1145                 return $entry;
1146         }
1147
1148         /**
1149          * encrypts data via AES
1150          *
1151          * @param string $data The data that is to be encrypted
1152          * @param string $key  The AES key
1153          *
1154          * @return string encrypted data
1155          */
1156         private static function aesEncrypt($data, $key)
1157         {
1158                 return openssl_encrypt($data, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1159         }
1160
1161         /**
1162          * decrypts data via AES
1163          *
1164          * @param string $encrypted The encrypted data
1165          * @param string $key       The AES key
1166          *
1167          * @return string decrypted data
1168          */
1169         public static function aesDecrypt($encrypted, $key)
1170         {
1171                 return openssl_decrypt($encrypted, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1172         }
1173
1174         /**
1175          * Delivers the atom content to the contacts
1176          *
1177          * @param array  $owner    Owner record
1178          * @param array  $contact  Contact record of the receiver
1179          * @param string $atom     Content that will be transmitted
1180          * @param bool   $dissolve (to be documented)
1181          *
1182          * @return int Deliver status. Negative values mean an error.
1183          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1184          * @throws \ImagickException
1185          * @todo  Add array type-hint for $owner, $contact
1186          */
1187         public static function deliver($owner, $contact, $atom, $dissolve = false)
1188         {
1189                 $idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);
1190
1191                 if ($contact['duplex'] && $contact['dfrn-id']) {
1192                         $idtosend = '0:' . $orig_id;
1193                 }
1194                 if ($contact['duplex'] && $contact['issued-id']) {
1195                         $idtosend = '1:' . $orig_id;
1196                 }
1197
1198                 $rino = DI::config()->get('system', 'rino_encrypt');
1199                 $rino = intval($rino);
1200
1201                 Logger::log("Local rino version: ". $rino, Logger::DEBUG);
1202
1203                 $ssl_val = intval(DI::config()->get('system', 'ssl_policy'));
1204
1205                 switch ($ssl_val) {
1206                         case BaseURL::SSL_POLICY_FULL:
1207                                 $ssl_policy = 'full';
1208                                 break;
1209                         case BaseURL::SSL_POLICY_SELFSIGN:
1210                                 $ssl_policy = 'self';
1211                                 break;
1212                         case BaseURL::SSL_POLICY_NONE:
1213                         default:
1214                                 $ssl_policy = 'none';
1215                                 break;
1216                 }
1217
1218                 $url = $contact['notify'] . '&dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino='.$rino : '');
1219
1220                 Logger::log('dfrn_deliver: ' . $url);
1221
1222                 $curlResult = Network::curl($url);
1223
1224                 if ($curlResult->isTimeout()) {
1225                         return -2; // timed out
1226                 }
1227
1228                 $xml = $curlResult->getBody();
1229
1230                 $curl_stat = $curlResult->getReturnCode();
1231                 if (empty($curl_stat)) {
1232                         return -3; // timed out
1233                 }
1234
1235                 Logger::log('dfrn_deliver: ' . $xml, Logger::DATA);
1236
1237                 if (empty($xml)) {
1238                         return 3;
1239                 }
1240
1241                 if (strpos($xml, '<?xml') === false) {
1242                         Logger::log('dfrn_deliver: no valid XML returned');
1243                         Logger::log('dfrn_deliver: returned XML: ' . $xml, Logger::DATA);
1244                         return 3;
1245                 }
1246
1247                 $res = XML::parseString($xml);
1248
1249                 if (!is_object($res) || (intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
1250                         if (empty($res->status)) {
1251                                 $status = 3;
1252                         } else {
1253                                 $status = $res->status;
1254                         }
1255
1256                         return $status;
1257                 }
1258
1259                 $postvars     = [];
1260                 $sent_dfrn_id = hex2bin((string) $res->dfrn_id);
1261                 $challenge    = hex2bin((string) $res->challenge);
1262                 $perm         = (($res->perm) ? $res->perm : null);
1263                 $dfrn_version = floatval($res->dfrn_version ?: 2.0);
1264                 $rino_remote_version = intval($res->rino);
1265                 $page         = (($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? 1 : 0);
1266
1267                 Logger::log("Remote rino version: ".$rino_remote_version." for ".$contact["url"], Logger::DEBUG);
1268
1269                 if ($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
1270                         $page = 2;
1271                 }
1272
1273                 $final_dfrn_id = '';
1274
1275                 if ($perm) {
1276                         if ((($perm == 'rw') && !intval($contact['writable']))
1277                                 || (($perm == 'r') && intval($contact['writable']))
1278                         ) {
1279                                 DBA::update('contact', ['writable' => ($perm == 'rw')], ['id' => $contact['id']]);
1280
1281                                 $contact['writable'] = (string) 1 - intval($contact['writable']);
1282                         }
1283                 }
1284
1285                 if (($contact['duplex'] && strlen($contact['pubkey']))
1286                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1287                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1288                 ) {
1289                         openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
1290                         openssl_public_decrypt($challenge, $postvars['challenge'], $contact['pubkey']);
1291                 } else {
1292                         openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
1293                         openssl_private_decrypt($challenge, $postvars['challenge'], $contact['prvkey']);
1294                 }
1295
1296                 $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
1297
1298                 if (strpos($final_dfrn_id, ':') == 1) {
1299                         $final_dfrn_id = substr($final_dfrn_id, 2);
1300                 }
1301
1302                 if ($final_dfrn_id != $orig_id) {
1303                         Logger::log('dfrn_deliver: wrong dfrn_id.');
1304                         // did not decode properly - cannot trust this site
1305                         return 3;
1306                 }
1307
1308                 $postvars['dfrn_id']      = $idtosend;
1309                 $postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
1310                 if ($dissolve) {
1311                         $postvars['dissolve'] = '1';
1312                 }
1313
1314                 if ((($contact['rel']) && ($contact['rel'] != Contact::SHARING) && (! $contact['blocked'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1315                         $postvars['data'] = $atom;
1316                         $postvars['perm'] = 'rw';
1317                 } else {
1318                         $postvars['data'] = str_replace('<dfrn:comment-allow>1', '<dfrn:comment-allow>0', $atom);
1319                         $postvars['perm'] = 'r';
1320                 }
1321
1322                 $postvars['ssl_policy'] = $ssl_policy;
1323
1324                 if ($page) {
1325                         $postvars['page'] = $page;
1326                 }
1327
1328
1329                 if ($rino > 0 && $rino_remote_version > 0 && (! $dissolve)) {
1330                         Logger::log('rino version: '. $rino_remote_version);
1331
1332                         switch ($rino_remote_version) {
1333                                 case 1:
1334                                         $key = openssl_random_pseudo_bytes(16);
1335                                         $data = self::aesEncrypt($postvars['data'], $key);
1336                                         break;
1337
1338                                 default:
1339                                         Logger::log("rino: invalid requested version '$rino_remote_version'");
1340                                         return -8;
1341                         }
1342
1343                         $postvars['rino'] = $rino_remote_version;
1344                         $postvars['data'] = bin2hex($data);
1345
1346                         if ($dfrn_version >= 2.1) {
1347                                 if (($contact['duplex'] && strlen($contact['pubkey']))
1348                                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1349                                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1350                                 ) {
1351                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1352                                 } else {
1353                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1354                                 }
1355                         } else {
1356                                 if (($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1357                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1358                                 } else {
1359                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1360                                 }
1361                         }
1362
1363                         Logger::log('md5 rawkey ' . md5($postvars['key']));
1364
1365                         $postvars['key'] = bin2hex($postvars['key']);
1366                 }
1367
1368
1369                 Logger::log('dfrn_deliver: ' . "SENDING: " . print_r($postvars, true), Logger::DATA);
1370
1371                 $postResult = Network::post($contact['notify'], $postvars);
1372
1373                 $xml = $postResult->getBody();
1374
1375                 Logger::log('dfrn_deliver: ' . "RECEIVED: " . $xml, Logger::DATA);
1376
1377                 $curl_stat = $postResult->getReturnCode();
1378                 if (empty($curl_stat) || empty($xml)) {
1379                         return -9; // timed out
1380                 }
1381
1382                 if (($curl_stat == 503) && stristr($postResult->getHeader(), 'retry-after')) {
1383                         return -10;
1384                 }
1385
1386                 if (strpos($xml, '<?xml') === false) {
1387                         Logger::log('dfrn_deliver: phase 2: no valid XML returned');
1388                         Logger::log('dfrn_deliver: phase 2: returned XML: ' . $xml, Logger::DATA);
1389                         return 3;
1390                 }
1391
1392                 $res = XML::parseString($xml);
1393
1394                 if (!isset($res->status)) {
1395                         return -11;
1396                 }
1397
1398                 // Possibly old servers had returned an empty value when everything was okay
1399                 if (empty($res->status)) {
1400                         $res->status = 200;
1401                 }
1402
1403                 if (!empty($res->message)) {
1404                         Logger::log('Delivery returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1405                 }
1406
1407                 return intval($res->status);
1408         }
1409
1410         /**
1411          * Transmits atom content to the contacts via the Diaspora transport layer
1412          *
1413          * @param array  $owner   Owner record
1414          * @param array  $contact Contact record of the receiver
1415          * @param string $atom    Content that will be transmitted
1416          *
1417          * @param bool   $public_batch
1418          * @return int Deliver status. Negative values mean an error.
1419          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1420          * @throws \ImagickException
1421          */
1422         public static function transmit($owner, $contact, $atom, $public_batch = false)
1423         {
1424                 if (!$public_batch) {
1425                         if (empty($contact['addr'])) {
1426                                 Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
1427                                 if (Contact::updateFromProbe($contact['id'])) {
1428                                         $new_contact = DBA::selectFirst('contact', ['addr'], ['id' => $contact['id']]);
1429                                         $contact['addr'] = $new_contact['addr'];
1430                                 }
1431
1432                                 if (empty($contact['addr'])) {
1433                                         Logger::log('Unable to find contact handle for ' . $contact['id'] . ' - ' . $contact['url']);
1434                                         return -21;
1435                                 }
1436                         }
1437
1438                         $fcontact = Diaspora::personByHandle($contact['addr']);
1439                         if (empty($fcontact)) {
1440                                 Logger::log('Unable to find contact details for ' . $contact['id'] . ' - ' . $contact['addr']);
1441                                 return -22;
1442                         }
1443                         $pubkey = $fcontact['pubkey'];
1444                 } else {
1445                         $pubkey = '';
1446                 }
1447
1448                 $envelope = Diaspora::buildMessage($atom, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
1449
1450                 // Create the endpoint for public posts. This is some WIP and should later be added to the probing
1451                 if ($public_batch && empty($contact["batch"])) {
1452                         $parts = parse_url($contact["notify"]);
1453                         $path_parts = explode('/', $parts['path']);
1454                         array_pop($path_parts);
1455                         $parts['path'] =  implode('/', $path_parts);
1456                         $contact["batch"] = Network::unparseURL($parts);
1457                 }
1458
1459                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
1460
1461                 if (empty($dest_url)) {
1462                         Logger::info('Empty destination', ['public' => $public_batch, 'contact' => $contact]);
1463                         return -24;
1464                 }
1465
1466                 $content_type = ($public_batch ? "application/magic-envelope+xml" : "application/json");
1467
1468                 $postResult = Network::post($dest_url, $envelope, ["Content-Type: ".$content_type]);
1469                 $xml = $postResult->getBody();
1470
1471                 $curl_stat = $postResult->getReturnCode();
1472                 if (empty($curl_stat) || empty($xml)) {
1473                         Logger::log('Empty answer from ' . $contact['id'] . ' - ' . $dest_url);
1474                         return -9; // timed out
1475                 }
1476
1477                 if (($curl_stat == 503) && (stristr($postResult->getHeader(), 'retry-after'))) {
1478                         return -10;
1479                 }
1480
1481                 if (strpos($xml, '<?xml') === false) {
1482                         Logger::log('No valid XML returned from ' . $contact['id'] . ' - ' . $dest_url);
1483                         Logger::log('Returned XML: ' . $xml, Logger::DATA);
1484                         return 3;
1485                 }
1486
1487                 $res = XML::parseString($xml);
1488
1489                 if (empty($res->status)) {
1490                         return -23;
1491                 }
1492
1493                 if (!empty($res->message)) {
1494                         Logger::log('Transmit to ' . $dest_url . ' returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1495                 }
1496
1497                 return intval($res->status);
1498         }
1499
1500         /**
1501          * Fetch the author data from head or entry items
1502          *
1503          * @param object $xpath     XPath object
1504          * @param object $context   In which context should the data be searched
1505          * @param array  $importer  Record of the importer user mixed with contact of the content
1506          * @param string $element   Element name from which the data is fetched
1507          * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
1508          * @param string $xml       optional, default empty
1509          *
1510          * @return array Relevant data of the author
1511          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1512          * @throws \ImagickException
1513          * @todo  Find good type-hints for all parameter
1514          */
1515         private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
1516         {
1517                 $author = [];
1518                 $author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
1519                 $author["link"] = XML::getFirstNodeValue($xpath, $element."/atom:uri/text()", $context);
1520
1521                 $fields = ['id', 'uid', 'url', 'network', 'avatar-date', 'avatar', 'name-date', 'uri-date', 'addr',
1522                         'name', 'nick', 'about', 'location', 'keywords', 'xmpp', 'bdyear', 'bd', 'hidden', 'contact-type'];
1523                 $condition = ["`uid` = ? AND `nurl` = ? AND `network` != ?",
1524                         $importer["importer_uid"], Strings::normaliseLink($author["link"]), Protocol::STATUSNET];
1525                 $contact_old = DBA::selectFirst('contact', $fields, $condition);
1526
1527                 if (DBA::isResult($contact_old)) {
1528                         $author["contact-id"] = $contact_old["id"];
1529                         $author["network"] = $contact_old["network"];
1530                 } else {
1531                         if (!$onlyfetch) {
1532                                 Logger::debug("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml);
1533                         }
1534
1535                         $author["contact-unknown"] = true;
1536                         $author["contact-id"] = $importer["id"];
1537                         $author["network"] = $importer["network"];
1538                         $onlyfetch = true;
1539                 }
1540
1541                 // Until now we aren't serving different sizes - but maybe later
1542                 $avatarlist = [];
1543                 /// @todo check if "avatar" or "photo" would be the best field in the specification
1544                 $avatars = $xpath->query($element . "/atom:link[@rel='avatar']", $context);
1545                 foreach ($avatars as $avatar) {
1546                         $href = "";
1547                         $width = 0;
1548                         foreach ($avatar->attributes as $attributes) {
1549                                 /// @TODO Rewrite these similar if() to one switch
1550                                 if ($attributes->name == "href") {
1551                                         $href = $attributes->textContent;
1552                                 }
1553                                 if ($attributes->name == "width") {
1554                                         $width = $attributes->textContent;
1555                                 }
1556                                 if ($attributes->name == "updated") {
1557                                         $author["avatar-date"] = $attributes->textContent;
1558                                 }
1559                         }
1560                         if (($width > 0) && ($href != "")) {
1561                                 $avatarlist[$width] = $href;
1562                         }
1563                 }
1564
1565                 if (count($avatarlist) > 0) {
1566                         krsort($avatarlist);
1567                         $author["avatar"] = current($avatarlist);
1568                 }
1569
1570                 if (empty($author['avatar']) && !empty($author['link'])) {
1571                         $cid = Contact::getIdForURL($author['link'], 0);
1572                         if (!empty($cid)) {
1573                                 $contact = DBA::selectFirst('contact', ['avatar'], ['id' => $cid]);
1574                                 if (DBA::isResult($contact)) {
1575                                         $author['avatar'] = $contact['avatar'];
1576                                 }
1577                         }
1578                 }
1579
1580                 if (empty($author['avatar'])) {
1581                         Logger::log('Empty author: ' . $xml);
1582                         $author['avatar'] = '';
1583                 }
1584
1585                 if (DBA::isResult($contact_old) && !$onlyfetch) {
1586                         Logger::log("Check if contact details for contact " . $contact_old["id"] . " (" . $contact_old["nick"] . ") have to be updated.", Logger::DEBUG);
1587
1588                         $poco = ["url" => $contact_old["url"]];
1589
1590                         // When was the last change to name or uri?
1591                         $name_element = $xpath->query($element . "/atom:name", $context)->item(0);
1592                         foreach ($name_element->attributes as $attributes) {
1593                                 if ($attributes->name == "updated") {
1594                                         $poco["name-date"] = $attributes->textContent;
1595                                 }
1596                         }
1597
1598                         $link_element = $xpath->query($element . "/atom:link", $context)->item(0);
1599                         foreach ($link_element->attributes as $attributes) {
1600                                 if ($attributes->name == "updated") {
1601                                         $poco["uri-date"] = $attributes->textContent;
1602                                 }
1603                         }
1604
1605                         // Update contact data
1606                         $value = XML::getFirstNodeValue($xpath, $element . "/dfrn:handle/text()", $context);
1607                         if ($value != "") {
1608                                 $poco["addr"] = $value;
1609                         }
1610
1611                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:displayName/text()", $context);
1612                         if ($value != "") {
1613                                 $poco["name"] = $value;
1614                         }
1615
1616                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:preferredUsername/text()", $context);
1617                         if ($value != "") {
1618                                 $poco["nick"] = $value;
1619                         }
1620
1621                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:note/text()", $context);
1622                         if ($value != "") {
1623                                 $poco["about"] = $value;
1624                         }
1625
1626                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:address/poco:formatted/text()", $context);
1627                         if ($value != "") {
1628                                 $poco["location"] = $value;
1629                         }
1630
1631                         /// @todo Only search for elements with "poco:type" = "xmpp"
1632                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:ims/poco:value/text()", $context);
1633                         if ($value != "") {
1634                                 $poco["xmpp"] = $value;
1635                         }
1636
1637                         /// @todo Add support for the following fields that we don't support by now in the contact table:
1638                         /// - poco:utcOffset
1639                         /// - poco:urls
1640                         /// - poco:locality
1641                         /// - poco:region
1642                         /// - poco:country
1643
1644                         // If the "hide" element is present then the profile isn't searchable.
1645                         $hide = intval(XML::getFirstNodeValue($xpath, $element . "/dfrn:hide/text()", $context) == "true");
1646
1647                         Logger::log("Hidden status for contact " . $contact_old["url"] . ": " . $hide, Logger::DEBUG);
1648
1649                         // If the contact isn't searchable then set the contact to "hidden".
1650                         // Problem: This can be manually overridden by the user.
1651                         if ($hide) {
1652                                 $contact_old["hidden"] = true;
1653                         }
1654
1655                         // Save the keywords into the contact table
1656                         $tags = [];
1657                         $tagelements = $xpath->evaluate($element . "/poco:tags/text()", $context);
1658                         foreach ($tagelements as $tag) {
1659                                 $tags[$tag->nodeValue] = $tag->nodeValue;
1660                         }
1661
1662                         if (count($tags)) {
1663                                 $poco["keywords"] = implode(", ", $tags);
1664                         }
1665
1666                         // "dfrn:birthday" contains the birthday converted to UTC
1667                         $birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1668
1669                         if (strtotime($birthday) > time()) {
1670                                 $bd_timestamp = strtotime($birthday);
1671
1672                                 $poco["bdyear"] = date("Y", $bd_timestamp);
1673                         }
1674
1675                         // "poco:birthday" is the birthday in the format "yyyy-mm-dd"
1676                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1677
1678                         if (!in_array($value, ["", "0000-00-00", DBA::NULL_DATE])) {
1679                                 $bdyear = date("Y");
1680                                 $value = str_replace(["0000", "0001"], $bdyear, $value);
1681
1682                                 if (strtotime($value) < time()) {
1683                                         $value = str_replace($bdyear, $bdyear + 1, $value);
1684                                 }
1685
1686                                 $poco["bd"] = $value;
1687                         }
1688
1689                         $contact = array_merge($contact_old, $poco);
1690
1691                         if ($contact_old["bdyear"] != $contact["bdyear"]) {
1692                                 Event::createBirthday($contact, $birthday);
1693                         }
1694
1695                         $fields = ['name' => $contact['name'], 'nick' => $contact['nick'], 'about' => $contact['about'],
1696                                 'location' => $contact['location'], 'addr' => $contact['addr'], 'keywords' => $contact['keywords'],
1697                                 'bdyear' => $contact['bdyear'], 'bd' => $contact['bd'], 'hidden' => $contact['hidden'],
1698                                 'xmpp' => $contact['xmpp'], 'name-date' => DateTimeFormat::utc($contact['name-date']),
1699                                 'unsearchable' => $contact['hidden'], 'uri-date' => DateTimeFormat::utc($contact['uri-date'])];
1700
1701                         DBA::update('contact', $fields, ['id' => $contact['id'], 'network' => $contact['network']], $contact_old);
1702
1703                         // Update the public contact. Don't set the "hidden" value, this is used differently for public contacts
1704                         unset($fields['hidden']);
1705                         $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($contact_old['url'])];
1706                         DBA::update('contact', $fields, $condition, true);
1707
1708                         Contact::updateAvatar($author['avatar'], $importer['importer_uid'], $contact['id']);
1709
1710                         $pcid = Contact::getIdForURL($contact_old['url']);
1711                         if (!empty($pcid)) {
1712                                 Contact::updateAvatar($author['avatar'], 0, $pcid);
1713                         }
1714
1715                         /*
1716                          * The generation is a sign for the reliability of the provided data.
1717                          * It is used in the socgraph.php to prevent that old contact data
1718                          * that was relayed over several servers can overwrite contact
1719                          * data that we received directly.
1720                          */
1721
1722                         $poco["generation"] = 2;
1723                         $poco["photo"] = $author["avatar"];
1724                         $poco["hide"] = $hide;
1725                         $poco["contact-type"] = $contact["contact-type"];
1726                         $gcid = GContact::update($poco);
1727
1728                         GContact::link($gcid, $importer["importer_uid"], $contact["id"]);
1729                 }
1730
1731                 return $author;
1732         }
1733
1734         /**
1735          * Transforms activity objects into an XML string
1736          *
1737          * @param object $xpath    XPath object
1738          * @param object $activity Activity object
1739          * @param string $element  element name
1740          *
1741          * @return string XML string
1742          * @todo Find good type-hints for all parameter
1743          */
1744         private static function transformActivity($xpath, $activity, $element)
1745         {
1746                 if (!is_object($activity)) {
1747                         return "";
1748                 }
1749
1750                 $obj_doc = new DOMDocument("1.0", "utf-8");
1751                 $obj_doc->formatOutput = true;
1752
1753                 $obj_element = $obj_doc->createElementNS( ActivityNamespace::ATOM1, $element);
1754
1755                 $activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
1756                 XML::addElement($obj_doc, $obj_element, "type", $activity_type);
1757
1758                 $id = $xpath->query("atom:id", $activity)->item(0);
1759                 if (is_object($id)) {
1760                         $obj_element->appendChild($obj_doc->importNode($id, true));
1761                 }
1762
1763                 $title = $xpath->query("atom:title", $activity)->item(0);
1764                 if (is_object($title)) {
1765                         $obj_element->appendChild($obj_doc->importNode($title, true));
1766                 }
1767
1768                 $links = $xpath->query("atom:link", $activity);
1769                 if (is_object($links)) {
1770                         foreach ($links as $link) {
1771                                 $obj_element->appendChild($obj_doc->importNode($link, true));
1772                         }
1773                 }
1774
1775                 $content = $xpath->query("atom:content", $activity)->item(0);
1776                 if (is_object($content)) {
1777                         $obj_element->appendChild($obj_doc->importNode($content, true));
1778                 }
1779
1780                 $obj_doc->appendChild($obj_element);
1781
1782                 $objxml = $obj_doc->saveXML($obj_element);
1783
1784                 /// @todo This isn't totally clean. We should find a way to transform the namespaces
1785                 $objxml = str_replace("<".$element.' xmlns="http://www.w3.org/2005/Atom">', "<".$element.">", $objxml);
1786                 return($objxml);
1787         }
1788
1789         /**
1790          * Processes the mail elements
1791          *
1792          * @param object $xpath    XPath object
1793          * @param object $mail     mail elements
1794          * @param array  $importer Record of the importer user mixed with contact of the content
1795          * @return void
1796          * @throws \Exception
1797          * @todo  Find good type-hints for all parameter
1798          */
1799         private static function processMail($xpath, $mail, $importer)
1800         {
1801                 Logger::log("Processing mails");
1802
1803                 $msg = [];
1804                 $msg["uid"] = $importer["importer_uid"];
1805                 $msg["from-name"] = $xpath->query("dfrn:sender/dfrn:name/text()", $mail)->item(0)->nodeValue;
1806                 $msg["from-url"] = $xpath->query("dfrn:sender/dfrn:uri/text()", $mail)->item(0)->nodeValue;
1807                 $msg["from-photo"] = $xpath->query("dfrn:sender/dfrn:avatar/text()", $mail)->item(0)->nodeValue;
1808                 $msg["contact-id"] = $importer["id"];
1809                 $msg["uri"] = $xpath->query("dfrn:id/text()", $mail)->item(0)->nodeValue;
1810                 $msg["parent-uri"] = $xpath->query("dfrn:in-reply-to/text()", $mail)->item(0)->nodeValue;
1811                 $msg["created"] = DateTimeFormat::utc($xpath->query("dfrn:sentdate/text()", $mail)->item(0)->nodeValue);
1812                 $msg["title"] = $xpath->query("dfrn:subject/text()", $mail)->item(0)->nodeValue;
1813                 $msg["body"] = $xpath->query("dfrn:content/text()", $mail)->item(0)->nodeValue;
1814
1815                 Mail::insert($msg);
1816         }
1817
1818         /**
1819          * Processes the suggestion elements
1820          *
1821          * @param object $xpath      XPath object
1822          * @param object $suggestion suggestion elements
1823          * @param array  $importer   Record of the importer user mixed with contact of the content
1824          * @return boolean
1825          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1826          * @todo  Find good type-hints for all parameter
1827          */
1828         private static function processSuggestion($xpath, $suggestion, $importer)
1829         {
1830                 Logger::log('Processing suggestions');
1831
1832                 /// @TODO Rewrite this to one statement
1833                 $suggest = [];
1834                 $suggest['uid'] = $importer['importer_uid'];
1835                 $suggest['cid'] = $importer['id'];
1836                 $suggest['url'] = $xpath->query('dfrn:url/text()', $suggestion)->item(0)->nodeValue;
1837                 $suggest['name'] = $xpath->query('dfrn:name/text()', $suggestion)->item(0)->nodeValue;
1838                 $suggest['photo'] = $xpath->query('dfrn:photo/text()', $suggestion)->item(0)->nodeValue;
1839                 $suggest['request'] = $xpath->query('dfrn:request/text()', $suggestion)->item(0)->nodeValue;
1840                 $suggest['body'] = $xpath->query('dfrn:note/text()', $suggestion)->item(0)->nodeValue;
1841
1842                 // Does our member already have a friend matching this description?
1843
1844                 /*
1845                  * The valid result means the friend we're about to send a friend
1846                  * suggestion already has them in their contact, which means no further
1847                  * action is required.
1848                  *
1849                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1850                  */
1851                 $condition = ['nurl' => Strings::normaliseLink($suggest['url']), 'uid' => $suggest['uid']];
1852                 if (DBA::exists('contact', $condition)) {
1853                         return false;
1854                 }
1855                 // Do we already have an fcontact record for this person?
1856
1857                 $fid = 0;
1858                 $fcontact = DBA::selectFirst('fcontact', ['id'], ['url' => $suggest['url']]);
1859                 if (DBA::isResult($fcontact)) {
1860                         $fid = $fcontact['id'];
1861
1862                         // OK, we do. Do we already have an introduction for this person?
1863                         if (DBA::exists('intro', ['uid' => $suggest['uid'], 'fid' => $fid])) {
1864                                 /*
1865                                  * The valid result means the friend we're about to send a friend
1866                                  * suggestion already has them in their contact, which means no further
1867                                  * action is required.
1868                                  *
1869                                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1870                                  */
1871                                 return false;
1872                         }
1873                 }
1874
1875                 if (!$fid) {
1876                         $fields = ['name' => $suggest['name'], 'url' => $suggest['url'],
1877                                 'photo' => $suggest['photo'], 'request' => $suggest['request']];
1878                         DBA::insert('fcontact', $fields);
1879                         $fid = DBA::lastInsertId();
1880                 }
1881
1882                 /*
1883                  * If no record in fcontact is found, below INSERT statement will not
1884                  * link an introduction to it.
1885                  */
1886                 if (empty($fid)) {
1887                         // Database record did not get created. Quietly give up.
1888                         exit();
1889                 }
1890
1891                 $hash = Strings::getRandomHex();
1892
1893                 $fields = ['uid' => $suggest['uid'], 'fid' => $fid, 'contact-id' => $suggest['cid'],
1894                         'note' => $suggest['body'], 'hash' => $hash, 'datetime' => DateTimeFormat::utcNow(), 'blocked' => false];
1895                 DBA::insert('intro', $fields);
1896
1897                 notification(
1898                         [
1899                                 'type'         => Type::SUGGEST,
1900                                 'notify_flags' => $importer['notify-flags'],
1901                                 'language'     => $importer['language'],
1902                                 'to_name'      => $importer['username'],
1903                                 'to_email'     => $importer['email'],
1904                                 'uid'          => $importer['importer_uid'],
1905                                 'item'         => $suggest,
1906                                 'link'         => DI::baseUrl().'/notifications/intros',
1907                                 'source_name'  => $importer['name'],
1908                                 'source_link'  => $importer['url'],
1909                                 'source_photo' => $importer['photo'],
1910                                 'verb'         => Activity::REQ_FRIEND,
1911                                 'otype'        => 'intro']
1912                 );
1913
1914                 return true;
1915         }
1916
1917         /**
1918          * Processes the relocation elements
1919          *
1920          * @param object $xpath      XPath object
1921          * @param object $relocation relocation elements
1922          * @param array  $importer   Record of the importer user mixed with contact of the content
1923          * @return boolean
1924          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1925          * @throws \ImagickException
1926          * @todo  Find good type-hints for all parameter
1927          */
1928         private static function processRelocation($xpath, $relocation, $importer)
1929         {
1930                 Logger::log("Processing relocations");
1931
1932                 /// @TODO Rewrite this to one statement
1933                 $relocate = [];
1934                 $relocate["uid"] = $importer["importer_uid"];
1935                 $relocate["cid"] = $importer["id"];
1936                 $relocate["url"] = $xpath->query("dfrn:url/text()", $relocation)->item(0)->nodeValue;
1937                 $relocate["addr"] = $xpath->query("dfrn:addr/text()", $relocation)->item(0)->nodeValue;
1938                 $relocate["name"] = $xpath->query("dfrn:name/text()", $relocation)->item(0)->nodeValue;
1939                 $relocate["avatar"] = $xpath->query("dfrn:avatar/text()", $relocation)->item(0)->nodeValue;
1940                 $relocate["photo"] = $xpath->query("dfrn:photo/text()", $relocation)->item(0)->nodeValue;
1941                 $relocate["thumb"] = $xpath->query("dfrn:thumb/text()", $relocation)->item(0)->nodeValue;
1942                 $relocate["micro"] = $xpath->query("dfrn:micro/text()", $relocation)->item(0)->nodeValue;
1943                 $relocate["request"] = $xpath->query("dfrn:request/text()", $relocation)->item(0)->nodeValue;
1944                 $relocate["confirm"] = $xpath->query("dfrn:confirm/text()", $relocation)->item(0)->nodeValue;
1945                 $relocate["notify"] = $xpath->query("dfrn:notify/text()", $relocation)->item(0)->nodeValue;
1946                 $relocate["poll"] = $xpath->query("dfrn:poll/text()", $relocation)->item(0)->nodeValue;
1947                 $relocate["sitepubkey"] = $xpath->query("dfrn:sitepubkey/text()", $relocation)->item(0)->nodeValue;
1948
1949                 if (($relocate["avatar"] == "") && ($relocate["photo"] != "")) {
1950                         $relocate["avatar"] = $relocate["photo"];
1951                 }
1952
1953                 if ($relocate["addr"] == "") {
1954                         $relocate["addr"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$3@$2", $relocate["url"]);
1955                 }
1956
1957                 // update contact
1958                 $r = q(
1959                         "SELECT `photo`, `url` FROM `contact` WHERE `id` = %d AND `uid` = %d",
1960                         intval($importer["id"]),
1961                         intval($importer["importer_uid"])
1962                 );
1963
1964                 if (!DBA::isResult($r)) {
1965                         Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
1966                         return false;
1967                 }
1968
1969                 $old = $r[0];
1970
1971                 // Update the gcontact entry
1972                 $relocate["server_url"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $relocate["url"]);
1973
1974                 $fields = ['name' => $relocate["name"], 'photo' => $relocate["avatar"],
1975                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1976                         'addr' => $relocate["addr"], 'connect' => $relocate["addr"],
1977                         'notify' => $relocate["notify"], 'server_url' => $relocate["server_url"]];
1978                 DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($old["url"])]);
1979
1980                 // Update the contact table. We try to find every entry.
1981                 $fields = ['name' => $relocate["name"], 'avatar' => $relocate["avatar"],
1982                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1983                         'addr' => $relocate["addr"], 'request' => $relocate["request"],
1984                         'confirm' => $relocate["confirm"], 'notify' => $relocate["notify"],
1985                         'poll' => $relocate["poll"], 'site-pubkey' => $relocate["sitepubkey"]];
1986                 $condition = ["(`id` = ?) OR (`nurl` = ?)", $importer["id"], Strings::normaliseLink($old["url"])];
1987
1988                 DBA::update('contact', $fields, $condition);
1989
1990                 Contact::updateAvatar($relocate["avatar"], $importer["importer_uid"], $importer["id"], true);
1991
1992                 Logger::log('Contacts are updated.');
1993
1994                 /// @TODO
1995                 /// merge with current record, current contents have priority
1996                 /// update record, set url-updated
1997                 /// update profile photos
1998                 /// schedule a scan?
1999                 return true;
2000         }
2001
2002         /**
2003          * Updates an item
2004          *
2005          * @param array $current   the current item record
2006          * @param array $item      the new item record
2007          * @param array $importer  Record of the importer user mixed with contact of the content
2008          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2009          * @return mixed
2010          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2011          * @todo  set proper type-hints (array?)
2012          */
2013         private static function updateContent($current, $item, $importer, $entrytype)
2014         {
2015                 $changed = false;
2016
2017                 if (self::isEditedTimestampNewer($current, $item)) {
2018                         // do not accept (ignore) an earlier edit than one we currently have.
2019                         if (DateTimeFormat::utc($item["edited"]) < $current["edited"]) {
2020                                 return false;
2021                         }
2022
2023                         $fields = ['title' => $item['title'] ?? '', 'body' => $item['body'] ?? '',
2024                                         'tag' => $item['tag'] ?? '', 'changed' => DateTimeFormat::utcNow(),
2025                                         'edited' => DateTimeFormat::utc($item["edited"])];
2026
2027                         $condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
2028                         Item::update($fields, $condition);
2029
2030                         $changed = true;
2031                 }
2032                 return $changed;
2033         }
2034
2035         /**
2036          * Detects the entry type of the item
2037          *
2038          * @param array $importer Record of the importer user mixed with contact of the content
2039          * @param array $item     the new item record
2040          *
2041          * @return int Is it a toplevel entry, a comment or a relayed comment?
2042          * @throws \Exception
2043          * @todo  set proper type-hints (array?)
2044          */
2045         private static function getEntryType($importer, $item)
2046         {
2047                 if ($item["parent-uri"] != $item["uri"]) {
2048                         $community = false;
2049
2050                         if ($importer["page-flags"] == User::PAGE_FLAGS_COMMUNITY || $importer["page-flags"] == User::PAGE_FLAGS_PRVGROUP) {
2051                                 $sql_extra = "";
2052                                 $community = true;
2053                                 Logger::log("possible community action");
2054                         } else {
2055                                 $sql_extra = " AND `contact`.`self` AND `item`.`wall` ";
2056                         }
2057
2058                         // was the top-level post for this action written by somebody on this site?
2059                         // Specifically, the recipient?
2060
2061                         $is_a_remote_action = false;
2062
2063                         $parent = Item::selectFirst(['parent-uri'], ['uri' => $item["parent-uri"]]);
2064                         if (DBA::isResult($parent)) {
2065                                 $r = q(
2066                                         "SELECT `item`.`forum_mode`, `item`.`wall` FROM `item`
2067                                         INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2068                                         WHERE `item`.`uri` = '%s' AND (`item`.`parent-uri` = '%s' OR `item`.`thr-parent` = '%s')
2069                                         AND `item`.`uid` = %d
2070                                         $sql_extra
2071                                         LIMIT 1",
2072                                         DBA::escape($parent["parent-uri"]),
2073                                         DBA::escape($parent["parent-uri"]),
2074                                         DBA::escape($parent["parent-uri"]),
2075                                         intval($importer["importer_uid"])
2076                                 );
2077                                 if (DBA::isResult($r)) {
2078                                         $is_a_remote_action = true;
2079                                 }
2080                         }
2081
2082                         /*
2083                          * Does this have the characteristics of a community or private group action?
2084                          * If it's an action to a wall post on a community/prvgroup page it's a
2085                          * valid community action. Also forum_mode makes it valid for sure.
2086                          * If neither, it's not.
2087                          */
2088                         if ($is_a_remote_action && $community && (!$r[0]["forum_mode"]) && (!$r[0]["wall"])) {
2089                                 $is_a_remote_action = false;
2090                                 Logger::log("not a community action");
2091                         }
2092
2093                         if ($is_a_remote_action) {
2094                                 return DFRN::REPLY_RC;
2095                         } else {
2096                                 return DFRN::REPLY;
2097                         }
2098                 } else {
2099                         return DFRN::TOP_LEVEL;
2100                 }
2101         }
2102
2103         /**
2104          * Send a "poke"
2105          *
2106          * @param array $item      The new item record
2107          * @param array $importer  Record of the importer user mixed with contact of the content
2108          * @return void
2109          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2110          * @todo  set proper type-hints (array?)
2111          */
2112         private static function doPoke(array $item, array $importer)
2113         {
2114                 $verb = urldecode(substr($item["verb"], strpos($item["verb"], "#")+1));
2115                 if (!$verb) {
2116                         return;
2117                 }
2118                 $xo = XML::parseString($item["object"], false);
2119
2120                 if (($xo->type == Activity\ObjectType::PERSON) && ($xo->id)) {
2121                         // somebody was poked/prodded. Was it me?
2122                         $Blink = '';
2123                         foreach ($xo->link as $l) {
2124                                 $atts = $l->attributes();
2125                                 switch ($atts["rel"]) {
2126                                         case "alternate":
2127                                                 $Blink = $atts["href"];
2128                                                 break;
2129                                         default:
2130                                                 break;
2131                                 }
2132                         }
2133
2134                         if ($Blink && Strings::compareLink($Blink, DI::baseUrl() . "/profile/" . $importer["nickname"])) {
2135                                 $author = DBA::selectFirst('contact', ['name', 'thumb', 'url'], ['id' => $item['author-id']]);
2136
2137                                 $parent = Item::selectFirst(['id'], ['uri' => $item['parent-uri'], 'uid' => $importer["importer_uid"]]);
2138                                 $item["parent"] = $parent['id'];
2139
2140                                 // send a notification
2141                                 notification(
2142                                         [
2143                                         "type"         => Type::POKE,
2144                                         "notify_flags" => $importer["notify-flags"],
2145                                         "language"     => $importer["language"],
2146                                         "to_name"      => $importer["username"],
2147                                         "to_email"     => $importer["email"],
2148                                         "uid"          => $importer["importer_uid"],
2149                                         "item"         => $item,
2150                                         "link"         => DI::baseUrl()."/display/".urlencode($item['guid']),
2151                                         "source_name"  => $author["name"],
2152                                         "source_link"  => $author["url"],
2153                                         "source_photo" => $author["thumb"],
2154                                         "verb"         => $item["verb"],
2155                                         "otype"        => "person",
2156                                         "activity"     => $verb,
2157                                         "parent"       => $item["parent"]]
2158                                 );
2159                         }
2160                 }
2161         }
2162
2163         /**
2164          * Processes several actions, depending on the verb
2165          *
2166          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2167          * @param array $importer  Record of the importer user mixed with contact of the content
2168          * @param array $item      the new item record
2169          * @param bool  $is_like   Is the verb a "like"?
2170          *
2171          * @return bool Should the processing of the entries be continued?
2172          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2173          * @todo  set proper type-hints (array?)
2174          */
2175         private static function processVerbs($entrytype, $importer, &$item, &$is_like)
2176         {
2177                 Logger::log("Process verb ".$item["verb"]." and object-type ".$item["object-type"]." for entrytype ".$entrytype, Logger::DEBUG);
2178
2179                 if (($entrytype == DFRN::TOP_LEVEL) && !empty($importer['id'])) {
2180                         // The filling of the the "contact" variable is done for legcy reasons
2181                         // The functions below are partly used by ostatus.php as well - where we have this variable
2182                         $contact = Contact::selectFirst([], ['id' => $importer['id']]);
2183
2184                         $activity = DI::activity();
2185
2186                         // Big question: Do we need these functions? They were part of the "consume_feed" function.
2187                         // This function once was responsible for DFRN and OStatus.
2188                         if ($activity->match($item["verb"], Activity::FOLLOW)) {
2189                                 Logger::log("New follower");
2190                                 Contact::addRelationship($importer, $contact, $item);
2191                                 return false;
2192                         }
2193                         if ($activity->match($item["verb"], Activity::UNFOLLOW)) {
2194                                 Logger::log("Lost follower");
2195                                 Contact::removeFollower($importer, $contact, $item);
2196                                 return false;
2197                         }
2198                         if ($activity->match($item["verb"], Activity::REQ_FRIEND)) {
2199                                 Logger::log("New friend request");
2200                                 Contact::addRelationship($importer, $contact, $item, true);
2201                                 return false;
2202                         }
2203                         if ($activity->match($item["verb"], Activity::UNFRIEND)) {
2204                                 Logger::log("Lost sharer");
2205                                 Contact::removeSharer($importer, $contact, $item);
2206                                 return false;
2207                         }
2208                 } else {
2209                         if (($item["verb"] == Activity::LIKE)
2210                                 || ($item["verb"] == Activity::DISLIKE)
2211                                 || ($item["verb"] == Activity::ATTEND)
2212                                 || ($item["verb"] == Activity::ATTENDNO)
2213                                 || ($item["verb"] == Activity::ATTENDMAYBE)
2214                         ) {
2215                                 $is_like = true;
2216                                 $item["gravity"] = GRAVITY_ACTIVITY;
2217                                 // only one like or dislike per person
2218                                 // splitted into two queries for performance issues
2219                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2220                                         'verb' => $item["verb"], 'parent-uri' => $item["parent-uri"]];
2221                                 if (Item::exists($condition)) {
2222                                         return false;
2223                                 }
2224
2225                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2226                                         'verb' => $item["verb"], 'thr-parent' => $item["parent-uri"]];
2227                                 if (Item::exists($condition)) {
2228                                         return false;
2229                                 }
2230
2231                                 // The owner of an activity must be the author
2232                                 $item["owner-name"] = $item["author-name"];
2233                                 $item["owner-link"] = $item["author-link"];
2234                                 $item["owner-avatar"] = $item["author-avatar"];
2235                                 $item["owner-id"] = $item["author-id"];
2236                         } else {
2237                                 $is_like = false;
2238                         }
2239
2240                         if (($item["verb"] == Activity::TAG) && ($item["object-type"] == Activity\ObjectType::TAGTERM)) {
2241                                 $xo = XML::parseString($item["object"], false);
2242                                 $xt = XML::parseString($item["target"], false);
2243
2244                                 if ($xt->type == Activity\ObjectType::NOTE) {
2245                                         $item_tag = Item::selectFirst(['id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
2246
2247                                         if (!DBA::isResult($item_tag)) {
2248                                                 Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2249                                                 return false;
2250                                         }
2251
2252                                         // extract tag, if not duplicate, add to parent item
2253                                         if ($xo->content) {
2254                                                 if (!stristr($item_tag["tag"], trim($xo->content))) {
2255                                                         $tag = $item_tag["tag"] . (strlen($item_tag["tag"]) ? ',' : '') . '#[url=' . $xo->id . ']'. $xo->content . '[/url]';
2256                                                         Item::update(['tag' => $tag], ['id' => $item_tag["id"]]);
2257                                                 }
2258                                         }
2259                                 }
2260                         }
2261                 }
2262                 return true;
2263         }
2264
2265         /**
2266          * Processes the link elements
2267          *
2268          * @param object $links link elements
2269          * @param array  $item  the item record
2270          * @return void
2271          * @todo set proper type-hints
2272          */
2273         private static function parseLinks($links, &$item)
2274         {
2275                 $rel = "";
2276                 $href = "";
2277                 $type = "";
2278                 $length = "0";
2279                 $title = "";
2280                 foreach ($links as $link) {
2281                         foreach ($link->attributes as $attributes) {
2282                                 switch ($attributes->name) {
2283                                         case "href"  : $href   = $attributes->textContent; break;
2284                                         case "rel"   : $rel    = $attributes->textContent; break;
2285                                         case "type"  : $type   = $attributes->textContent; break;
2286                                         case "length": $length = $attributes->textContent; break;
2287                                         case "title" : $title  = $attributes->textContent; break;
2288                                 }
2289                         }
2290                         if (($rel != "") && ($href != "")) {
2291                                 switch ($rel) {
2292                                         case "alternate":
2293                                                 $item["plink"] = $href;
2294                                                 break;
2295                                         case "enclosure":
2296                                                 if (!empty($item["attach"])) {
2297                                                         $item["attach"] .= ",";
2298                                                 } else {
2299                                                         $item["attach"] = "";
2300                                                 }
2301
2302                                                 $item["attach"] .= '[attach]href="' . $href . '" length="' . $length . '" type="' . $type . '" title="' . $title . '"[/attach]';
2303                                                 break;
2304                                 }
2305                         }
2306                 }
2307         }
2308
2309         /**
2310          * Processes the entry elements which contain the items and comments
2311          *
2312          * @param array  $header   Array of the header elements that always stay the same
2313          * @param object $xpath    XPath object
2314          * @param object $entry    entry elements
2315          * @param array  $importer Record of the importer user mixed with contact of the content
2316          * @param string $xml      xml
2317          * @return void
2318          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2319          * @throws \ImagickException
2320          * @todo  Add type-hints
2321          */
2322         private static function processEntry($header, $xpath, $entry, $importer, $xml)
2323         {
2324                 Logger::log("Processing entries");
2325
2326                 $item = $header;
2327
2328                 $item["protocol"] = Conversation::PARCEL_DFRN;
2329
2330                 $item["source"] = $xml;
2331
2332                 // Get the uri
2333                 $item["uri"] = XML::getFirstNodeValue($xpath, "atom:id/text()", $entry);
2334
2335                 $item["edited"] = XML::getFirstNodeValue($xpath, "atom:updated/text()", $entry);
2336
2337                 $current = Item::selectFirst(['id', 'uid', 'edited', 'body'],
2338                         ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]]
2339                 );
2340                 // Is there an existing item?
2341                 if (DBA::isResult($current) && !self::isEditedTimestampNewer($current, $item)) {
2342                         Logger::log("Item ".$item["uri"]." (".$item['edited'].") already existed.", Logger::DEBUG);
2343                         return;
2344                 }
2345
2346                 // Fetch the owner
2347                 $owner = self::fetchauthor($xpath, $entry, $importer, "dfrn:owner", true, $xml);
2348
2349                 $owner_unknown = (isset($owner["contact-unknown"]) && $owner["contact-unknown"]);
2350
2351                 $item["owner-name"] = $owner["name"];
2352                 $item["owner-link"] = $owner["link"];
2353                 $item["owner-avatar"] = $owner["avatar"];
2354                 $item["owner-id"] = Contact::getIdForURL($owner["link"], 0);
2355
2356                 // fetch the author
2357                 $author = self::fetchauthor($xpath, $entry, $importer, "atom:author", true, $xml);
2358
2359                 $item["author-name"] = $author["name"];
2360                 $item["author-link"] = $author["link"];
2361                 $item["author-avatar"] = $author["avatar"];
2362                 $item["author-id"] = Contact::getIdForURL($author["link"], 0);
2363
2364                 $item["title"] = XML::getFirstNodeValue($xpath, "atom:title/text()", $entry);
2365
2366                 $item["created"] = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2367
2368                 $item["body"] = XML::getFirstNodeValue($xpath, "dfrn:env/text()", $entry);
2369                 $item["body"] = str_replace([' ',"\t","\r","\n"], ['','','',''], $item["body"]);
2370
2371                 $item["body"] = Strings::base64UrlDecode($item["body"]);
2372
2373                 $item["body"] = BBCode::limitBodySize($item["body"]);
2374
2375                 /// @todo We should check for a repeated post and if we know the repeated author.
2376
2377                 // We don't need the content element since "dfrn:env" is always present
2378                 //$item["body"] = $xpath->query("atom:content/text()", $entry)->item(0)->nodeValue;
2379
2380                 $item["location"] = XML::getFirstNodeValue($xpath, "dfrn:location/text()", $entry);
2381
2382                 $item["coord"] = XML::getFirstNodeValue($xpath, "georss:point", $entry);
2383
2384                 $item["private"] = XML::getFirstNodeValue($xpath, "dfrn:private/text()", $entry);
2385
2386                 $unlisted = XML::getFirstNodeValue($xpath, "dfrn:unlisted/text()", $entry);
2387                 if (!empty($unlisted) && ($item['private'] != Item::PRIVATE)) {
2388                         $item['private'] = Item::UNLISTED;
2389                 }
2390
2391                 $item["extid"] = XML::getFirstNodeValue($xpath, "dfrn:extid/text()", $entry);
2392
2393                 if (XML::getFirstNodeValue($xpath, "dfrn:bookmark/text()", $entry) == "true") {
2394                         $item["post-type"] = Item::PT_PAGE;
2395                 }
2396
2397                 $notice_info = $xpath->query("statusnet:notice_info", $entry);
2398                 if ($notice_info && ($notice_info->length > 0)) {
2399                         foreach ($notice_info->item(0)->attributes as $attributes) {
2400                                 if ($attributes->name == "source") {
2401                                         $item["app"] = strip_tags($attributes->textContent);
2402                                 }
2403                         }
2404                 }
2405
2406                 $item["guid"] = XML::getFirstNodeValue($xpath, "dfrn:diaspora_guid/text()", $entry);
2407
2408                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
2409
2410                 // We store the data from "dfrn:diaspora_signature" in a different table, this is done in "Item::insert"
2411                 $dsprsig = XML::unescape(XML::getFirstNodeValue($xpath, "dfrn:diaspora_signature/text()", $entry));
2412                 if ($dsprsig != "") {
2413                         $item["dsprsig"] = $dsprsig;
2414                 }
2415
2416                 $item["verb"] = XML::getFirstNodeValue($xpath, "activity:verb/text()", $entry);
2417
2418                 if (XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry) != "") {
2419                         $item["object-type"] = XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry);
2420                 }
2421
2422                 $object = $xpath->query("activity:object", $entry)->item(0);
2423                 $item["object"] = self::transformActivity($xpath, $object, "object");
2424
2425                 if (trim($item["object"]) != "") {
2426                         $r = XML::parseString($item["object"], false);
2427                         if (isset($r->type)) {
2428                                 $item["object-type"] = $r->type;
2429                         }
2430                 }
2431
2432                 $target = $xpath->query("activity:target", $entry)->item(0);
2433                 $item["target"] = self::transformActivity($xpath, $target, "target");
2434
2435                 $categories = $xpath->query("atom:category", $entry);
2436                 if ($categories) {
2437                         foreach ($categories as $category) {
2438                                 $term = "";
2439                                 $scheme = "";
2440                                 foreach ($category->attributes as $attributes) {
2441                                         if ($attributes->name == "term") {
2442                                                 $term = $attributes->textContent;
2443                                         }
2444
2445                                         if ($attributes->name == "scheme") {
2446                                                 $scheme = $attributes->textContent;
2447                                         }
2448                                 }
2449
2450                                 if (($term != "") && ($scheme != "")) {
2451                                         $parts = explode(":", $scheme);
2452                                         if ((count($parts) >= 4) && (array_shift($parts) == "X-DFRN")) {
2453                                                 $termhash = array_shift($parts);
2454                                                 $termurl = implode(":", $parts);
2455
2456                                                 if (!empty($item["tag"])) {
2457                                                         $item["tag"] .= ",";
2458                                                 } else {
2459                                                         $item["tag"] = "";
2460                                                 }
2461
2462                                                 $item["tag"] .= $termhash . "[url=" . $termurl . "]" . $term . "[/url]";
2463
2464                                                 // Store the hashtag/mention
2465                                                 $fields = ['uri-id' => $item['uri-id'], 'name' => substr($term, 0, 64)];
2466
2467                                                 if ($termhash == Term::TAG_CHARACTER[Term::MENTION]) {
2468                                                         $fields['type'] = Term::EXCLUSIVE_MENTION;
2469                                                 } elseif ($termhash == Term::TAG_CHARACTER[Term::EXCLUSIVE_MENTION]) {
2470                                                         $fields['type'] = Term::EXCLUSIVE_MENTION;
2471                                                 } elseif ($termhash == Term::TAG_CHARACTER[Term::IMPLICIT_MENTION]) {
2472                                                         $fields['type'] = Term::IMPLICIT_MENTION;
2473                                                 } elseif ($termhash == Term::TAG_CHARACTER[Term::HASHTAG]) {
2474                                                         $fields['type'] = Term::IMPLICIT_MENTION;
2475                                                 }
2476
2477                                                 if (!empty($termurl)) {
2478                                                         $fields['url'] = $termurl;
2479                                                 }
2480
2481                                                 DBA::insert('tag', $fields, true);
2482
2483                                                 Logger::info('Stored tag/mention', ['uri-id' => $item['uri-id'], 'tag' => $term, 'url' => $termurl, 'hash' => $termhash, 'fields' => $fields]);
2484                                         }
2485                                 }
2486                         }
2487                 }
2488
2489                 $links = $xpath->query("atom:link", $entry);
2490                 if ($links) {
2491                         self::parseLinks($links, $item);
2492                 }
2493
2494                 $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
2495
2496                 $conv = $xpath->query('ostatus:conversation', $entry);
2497                 if (is_object($conv->item(0))) {
2498                         foreach ($conv->item(0)->attributes as $attributes) {
2499                                 if ($attributes->name == "ref") {
2500                                         $item['conversation-uri'] = $attributes->textContent;
2501                                 }
2502                                 if ($attributes->name == "href") {
2503                                         $item['conversation-href'] = $attributes->textContent;
2504                                 }
2505                         }
2506                 }
2507
2508                 // Is it a reply or a top level posting?
2509                 $item["parent-uri"] = $item["uri"];
2510
2511                 $inreplyto = $xpath->query("thr:in-reply-to", $entry);
2512                 if (is_object($inreplyto->item(0))) {
2513                         foreach ($inreplyto->item(0)->attributes as $attributes) {
2514                                 if ($attributes->name == "ref") {
2515                                         $item["parent-uri"] = $attributes->textContent;
2516                                 }
2517                         }
2518                 }
2519
2520                 // Get the type of the item (Top level post, reply or remote reply)
2521                 $entrytype = self::getEntryType($importer, $item);
2522
2523                 // Now assign the rest of the values that depend on the type of the message
2524                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2525                         if (!isset($item["object-type"])) {
2526                                 $item["object-type"] = Activity\ObjectType::COMMENT;
2527                         }
2528
2529                         if ($item["contact-id"] != $owner["contact-id"]) {
2530                                 $item["contact-id"] = $owner["contact-id"];
2531                         }
2532
2533                         if (($item["network"] != $owner["network"]) && ($owner["network"] != "")) {
2534                                 $item["network"] = $owner["network"];
2535                         }
2536
2537                         if ($item["contact-id"] != $author["contact-id"]) {
2538                                 $item["contact-id"] = $author["contact-id"];
2539                         }
2540
2541                         if (($item["network"] != $author["network"]) && ($author["network"] != "")) {
2542                                 $item["network"] = $author["network"];
2543                         }
2544                 }
2545
2546                 // Ensure to have the correct share data
2547                 $item = Item::addShareDataFromOriginal($item);
2548
2549                 if ($entrytype == DFRN::REPLY_RC) {
2550                         $item["wall"] = 1;
2551                 } elseif ($entrytype == DFRN::TOP_LEVEL) {
2552                         if (!isset($item["object-type"])) {
2553                                 $item["object-type"] = Activity\ObjectType::NOTE;
2554                         }
2555
2556                         // Is it an event?
2557                         if (($item["object-type"] == Activity\ObjectType::EVENT) && !$owner_unknown) {
2558                                 Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
2559                                 $ev = Event::fromBBCode($item["body"]);
2560                                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
2561                                         Logger::log("Event in item ".$item["uri"]." was found.", Logger::DEBUG);
2562                                         $ev["cid"]     = $importer["id"];
2563                                         $ev["uid"]     = $importer["importer_uid"];
2564                                         $ev["uri"]     = $item["uri"];
2565                                         $ev["edited"]  = $item["edited"];
2566                                         $ev["private"] = $item["private"];
2567                                         $ev["guid"]    = $item["guid"];
2568                                         $ev["plink"]   = $item["plink"];
2569
2570                                         $condition = ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]];
2571                                         $event = DBA::selectFirst('event', ['id'], $condition);
2572                                         if (DBA::isResult($event)) {
2573                                                 $ev["id"] = $event["id"];
2574                                         }
2575
2576                                         $event_id = Event::store($ev);
2577                                         Logger::log("Event ".$event_id." was stored", Logger::DEBUG);
2578                                         return;
2579                                 }
2580                         }
2581                 }
2582
2583                 if (!self::processVerbs($entrytype, $importer, $item, $is_like)) {
2584                         Logger::log("Exiting because 'processVerbs' told us so", Logger::DEBUG);
2585                         return;
2586                 }
2587
2588                 // This check is done here to be able to receive connection requests in "processVerbs"
2589                 if (($entrytype == DFRN::TOP_LEVEL) && $owner_unknown) {
2590                         Logger::log("Item won't be stored because user " . $importer["importer_uid"] . " doesn't follow " . $item["owner-link"] . ".", Logger::DEBUG);
2591                         return;
2592                 }
2593
2594
2595                 // Update content if 'updated' changes
2596                 if (DBA::isResult($current)) {
2597                         if (self::updateContent($current, $item, $importer, $entrytype)) {
2598                                 Logger::log("Item ".$item["uri"]." was updated.", Logger::DEBUG);
2599                         } else {
2600                                 Logger::log("Item " . $item["uri"] . " already existed.", Logger::DEBUG);
2601                         }
2602                         return;
2603                 }
2604
2605                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2606                         $posted_id = Item::insert($item);
2607                         if ($posted_id) {
2608                                 Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
2609
2610                                 if ($item['uid'] == 0) {
2611                                         Item::distribute($posted_id);
2612                                 }
2613
2614                                 return true;
2615                         }
2616                 } else { // $entrytype == DFRN::TOP_LEVEL
2617                         if (($importer["uid"] == 0) && ($importer["importer_uid"] != 0)) {
2618                                 Logger::log("Contact ".$importer["id"]." isn't known to user ".$importer["importer_uid"].". The post will be ignored.", Logger::DEBUG);
2619                                 return;
2620                         }
2621                         if (!Strings::compareLink($item["owner-link"], $importer["url"])) {
2622                                 /*
2623                                  * The item owner info is not our contact. It's OK and is to be expected if this is a tgroup delivery,
2624                                  * but otherwise there's a possible data mixup on the sender's system.
2625                                  * the tgroup delivery code called from Item::insert will correct it if it's a forum,
2626                                  * but we're going to unconditionally correct it here so that the post will always be owned by our contact.
2627                                  */
2628                                 Logger::log('Correcting item owner.', Logger::DEBUG);
2629                                 $item["owner-link"] = $importer["url"];
2630                                 $item["owner-id"] = Contact::getIdForURL($importer["url"], 0);
2631                         }
2632
2633                         if (($importer["rel"] == Contact::FOLLOWER) && (!self::tgroupCheck($importer["importer_uid"], $item))) {
2634                                 Logger::log("Contact ".$importer["id"]." is only follower and tgroup check was negative.", Logger::DEBUG);
2635                                 return;
2636                         }
2637
2638                         // This is my contact on another system, but it's really me.
2639                         // Turn this into a wall post.
2640                         $notify = Item::isRemoteSelf($importer, $item);
2641
2642                         $posted_id = Item::insert($item, false, $notify);
2643
2644                         if ($notify) {
2645                                 $posted_id = $notify;
2646                         }
2647
2648                         Logger::log("Item was stored with id ".$posted_id, Logger::DEBUG);
2649
2650                         if ($item['uid'] == 0) {
2651                                 Item::distribute($posted_id);
2652                         }
2653
2654                         if (stristr($item["verb"], Activity::POKE)) {
2655                                 $item['id'] = $posted_id;
2656                                 self::doPoke($item, $importer);
2657                         }
2658                 }
2659         }
2660
2661         /**
2662          * Deletes items
2663          *
2664          * @param object $xpath    XPath object
2665          * @param object $deletion deletion elements
2666          * @param array  $importer Record of the importer user mixed with contact of the content
2667          * @return void
2668          * @throws \Exception
2669          * @todo  set proper type-hints
2670          */
2671         private static function processDeletion($xpath, $deletion, $importer)
2672         {
2673                 Logger::log("Processing deletions");
2674                 $uri = null;
2675
2676                 foreach ($deletion->attributes as $attributes) {
2677                         if ($attributes->name == "ref") {
2678                                 $uri = $attributes->textContent;
2679                         }
2680                 }
2681
2682                 if (!$uri || !$importer["id"]) {
2683                         return false;
2684                 }
2685
2686                 $condition = ['uri' => $uri, 'uid' => $importer["importer_uid"]];
2687                 $item = Item::selectFirst(['id', 'parent', 'contact-id', 'file', 'deleted'], $condition);
2688                 if (!DBA::isResult($item)) {
2689                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " wasn't found.", Logger::DEBUG);
2690                         return;
2691                 }
2692
2693                 if (strstr($item['file'], '[')) {
2694                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " is filed. So it won't be deleted.", Logger::DEBUG);
2695                         return;
2696                 }
2697
2698                 // When it is a starting post it has to belong to the person that wants to delete it
2699                 if (($item['id'] == $item['parent']) && ($item['contact-id'] != $importer["id"])) {
2700                         Logger::log("Item with uri " . $uri . " don't belong to contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2701                         return;
2702                 }
2703
2704                 // Comments can be deleted by the thread owner or comment owner
2705                 if (($item['id'] != $item['parent']) && ($item['contact-id'] != $importer["id"])) {
2706                         $condition = ['id' => $item['parent'], 'contact-id' => $importer["id"]];
2707                         if (!Item::exists($condition)) {
2708                                 Logger::log("Item with uri " . $uri . " wasn't found or mustn't be deleted by contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2709                                 return;
2710                         }
2711                 }
2712
2713                 if ($item["deleted"]) {
2714                         return;
2715                 }
2716
2717                 Logger::log('deleting item '.$item['id'].' uri='.$uri, Logger::DEBUG);
2718
2719                 Item::markForDeletion(['id' => $item['id']]);
2720         }
2721
2722         /**
2723          * Imports a DFRN message
2724          *
2725          * @param string $xml          The DFRN message
2726          * @param array  $importer     Record of the importer user mixed with contact of the content
2727          * @param bool   $sort_by_date Is used when feeds are polled
2728          * @return integer Import status
2729          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2730          * @throws \ImagickException
2731          * @todo  set proper type-hints
2732          */
2733         public static function import($xml, $importer, $sort_by_date = false)
2734         {
2735                 if ($xml == "") {
2736                         return 400;
2737                 }
2738
2739                 $doc = new DOMDocument();
2740                 @$doc->loadXML($xml);
2741
2742                 $xpath = new DOMXPath($doc);
2743                 $xpath->registerNamespace("atom", ActivityNamespace::ATOM1);
2744                 $xpath->registerNamespace("thr", ActivityNamespace::THREAD);
2745                 $xpath->registerNamespace("at", ActivityNamespace::TOMB);
2746                 $xpath->registerNamespace("media", ActivityNamespace::MEDIA);
2747                 $xpath->registerNamespace("dfrn", ActivityNamespace::DFRN);
2748                 $xpath->registerNamespace("activity", ActivityNamespace::ACTIVITY);
2749                 $xpath->registerNamespace("georss", ActivityNamespace::GEORSS);
2750                 $xpath->registerNamespace("poco", ActivityNamespace::POCO);
2751                 $xpath->registerNamespace("ostatus", ActivityNamespace::OSTATUS);
2752                 $xpath->registerNamespace("statusnet", ActivityNamespace::STATUSNET);
2753
2754                 $header = [];
2755                 $header["uid"] = $importer["importer_uid"];
2756                 $header["network"] = Protocol::DFRN;
2757                 $header["wall"] = 0;
2758                 $header["origin"] = 0;
2759                 $header["contact-id"] = $importer["id"];
2760
2761                 // Update the contact table if the data has changed
2762
2763                 // The "atom:author" is only present in feeds
2764                 if ($xpath->query("/atom:feed/atom:author")->length > 0) {
2765                         self::fetchauthor($xpath, $doc->firstChild, $importer, "atom:author", false, $xml);
2766                 }
2767
2768                 // Only the "dfrn:owner" in the head section contains all data
2769                 if ($xpath->query("/atom:feed/dfrn:owner")->length > 0) {
2770                         self::fetchauthor($xpath, $doc->firstChild, $importer, "dfrn:owner", false, $xml);
2771                 }
2772
2773                 Logger::log("Import DFRN message for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2774
2775                 // is it a public forum? Private forums aren't exposed with this method
2776                 $forum = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:community/text()"));
2777
2778                 // The account type is new since 3.5.1
2779                 if ($xpath->query("/atom:feed/dfrn:account_type")->length > 0) {
2780                         // Hint: We are using separate update calls for uid=0 and uid!=0 since a combined call is bad for the database performance
2781
2782                         $accounttype = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:account_type/text()"));
2783
2784                         if ($accounttype != $importer["contact-type"]) {
2785                                 DBA::update('contact', ['contact-type' => $accounttype], ['id' => $importer['id']]);
2786
2787                                 // Updating the public contact as well
2788                                 DBA::update('contact', ['contact-type' => $accounttype], ['uid' => 0, 'nurl' => $importer['nurl']]);
2789                         }
2790                         // A forum contact can either have set "forum" or "prv" - but not both
2791                         if ($accounttype == User::ACCOUNT_TYPE_COMMUNITY) {
2792                                 // It's a forum, so either set the public or private forum flag
2793                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `id` = ?', $forum, !$forum, $importer['id']];
2794                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2795
2796                                 // Updating the public contact as well
2797                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `uid` = 0 AND `nurl` = ?', $forum, !$forum, $importer['nurl']];
2798                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2799                         } else {
2800                                 // It's not a forum, so remove the flags
2801                                 $condition = ['(`forum` OR `prv`) AND `id` = ?', $importer['id']];
2802                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2803
2804                                 // Updating the public contact as well
2805                                 $condition = ['(`forum` OR `prv`) AND `uid` = 0 AND `nurl` = ?', $importer['nurl']];
2806                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2807                         }
2808                 } elseif ($forum != $importer["forum"]) { // Deprecated since 3.5.1
2809                         $condition = ['`forum` != ? AND `id` = ?', $forum, $importer["id"]];
2810                         DBA::update('contact', ['forum' => $forum], $condition);
2811
2812                         // Updating the public contact as well
2813                         $condition = ['`forum` != ? AND `uid` = 0 AND `nurl` = ?', $forum, $importer['nurl']];
2814                         DBA::update('contact', ['forum' => $forum], $condition);
2815                 }
2816
2817
2818                 // We are processing relocations even if we are ignoring a contact
2819                 $relocations = $xpath->query("/atom:feed/dfrn:relocate");
2820                 foreach ($relocations as $relocation) {
2821                         self::processRelocation($xpath, $relocation, $importer);
2822                 }
2823
2824                 if (($importer["uid"] != 0) && !$importer["readonly"]) {
2825                         $mails = $xpath->query("/atom:feed/dfrn:mail");
2826                         foreach ($mails as $mail) {
2827                                 self::processMail($xpath, $mail, $importer);
2828                         }
2829
2830                         $suggestions = $xpath->query("/atom:feed/dfrn:suggest");
2831                         foreach ($suggestions as $suggestion) {
2832                                 self::processSuggestion($xpath, $suggestion, $importer);
2833                         }
2834                 }
2835
2836                 $deletions = $xpath->query("/atom:feed/at:deleted-entry");
2837                 foreach ($deletions as $deletion) {
2838                         self::processDeletion($xpath, $deletion, $importer);
2839                 }
2840
2841                 if (!$sort_by_date) {
2842                         $entries = $xpath->query("/atom:feed/atom:entry");
2843                         foreach ($entries as $entry) {
2844                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2845                         }
2846                 } else {
2847                         $newentries = [];
2848                         $entries = $xpath->query("/atom:feed/atom:entry");
2849                         foreach ($entries as $entry) {
2850                                 $created = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2851                                 $newentries[strtotime($created)] = $entry;
2852                         }
2853
2854                         // Now sort after the publishing date
2855                         ksort($newentries);
2856
2857                         foreach ($newentries as $entry) {
2858                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2859                         }
2860                 }
2861                 Logger::log("Import done for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2862                 return 200;
2863         }
2864
2865         /**
2866          * Returns the activity verb
2867          *
2868          * @param array $item Item array
2869          *
2870          * @return string activity verb
2871          */
2872         private static function constructVerb(array $item)
2873         {
2874                 if ($item['verb']) {
2875                         return $item['verb'];
2876                 }
2877                 return Activity::POST;
2878         }
2879
2880         private static function tgroupCheck($uid, $item)
2881         {
2882                 $mention = false;
2883
2884                 // check that the message originated elsewhere and is a top-level post
2885
2886                 if ($item['wall'] || $item['origin'] || ($item['uri'] != $item['parent-uri'])) {
2887                         return false;
2888                 }
2889
2890                 $user = DBA::selectFirst('user', ['page-flags', 'nickname'], ['uid' => $uid]);
2891                 if (!DBA::isResult($user)) {
2892                         return false;
2893                 }
2894
2895                 $community_page = ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY);
2896                 $prvgroup = ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP);
2897
2898                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
2899
2900                 /*
2901                  * Diaspora uses their own hardwired link URL in @-tags
2902                  * instead of the one we supply with webfinger
2903                  */
2904                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
2905
2906                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2907                 if ($cnt) {
2908                         foreach ($matches as $mtch) {
2909                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2910                                         $mention = true;
2911                                         Logger::log('mention found: ' . $mtch[2]);
2912                                 }
2913                         }
2914                 }
2915
2916                 if (!$mention) {
2917                         return false;
2918                 }
2919
2920                 return $community_page || $prvgroup;
2921         }
2922
2923         /**
2924          * This function returns true if $update has an edited timestamp newer
2925          * than $existing, i.e. $update contains new data which should override
2926          * what's already there.  If there is no timestamp yet, the update is
2927          * assumed to be newer.  If the update has no timestamp, the existing
2928          * item is assumed to be up-to-date.  If the timestamps are equal it
2929          * assumes the update has been seen before and should be ignored.
2930          *
2931          * @param $existing
2932          * @param $update
2933          * @return bool
2934          * @throws \Exception
2935          */
2936         private static function isEditedTimestampNewer($existing, $update)
2937         {
2938                 if (empty($existing['edited'])) {
2939                         return true;
2940                 }
2941                 if (empty($update['edited'])) {
2942                         return false;
2943                 }
2944
2945                 $existing_edited = DateTimeFormat::utc($existing['edited']);
2946                 $update_edited = DateTimeFormat::utc($update['edited']);
2947
2948                 return (strcmp($existing_edited, $update_edited) < 0);
2949         }
2950
2951         /**
2952          * Checks if the given contact url does support DFRN
2953          *
2954          * @param string  $url    profile url
2955          * @param boolean $update Update the profile
2956          * @return boolean
2957          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2958          * @throws \ImagickException
2959          */
2960         public static function isSupportedByContactUrl($url, $update = false)
2961         {
2962                 $probe = Probe::uri($url, Protocol::DFRN, 0, !$update);
2963                 return $probe['network'] == Protocol::DFRN;
2964         }
2965 }