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