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