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\FContact;
  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\Post\Category;
  43 use Friendica\Model\Profile;
  44 use Friendica\Model\Tag;
  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                         $sql_post_table = sprintf("INNER JOIN (SELECT `uri-id` FROM `category-view` WHERE `name` = '%s' AND `type` = %d AND `uid` = %d ORDER BY `uri-id` DESC) AS `category` ON `item`.`uri-id` = `category`.`uri-id` ",
 245                                 DBA::escape(Strings::protectSprintf($category)), intval(Category::CATEGORY), intval($owner_id));
 246                 }
 247
 248                 if ($public_feed && ! $converse) {
 249                         $sql_extra .= " AND `contact`.`self` = 1 ";
 250                 }
 251
 252                 $check_date = DateTimeFormat::utc($last_update);
 253
 254                 $r = q(
 255                         "SELECT `item`.`id`
 256                         FROM `item` USE INDEX (`uid_wall_changed`) $sql_post_table
 257                         STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
 258                         WHERE `item`.`uid` = %d AND `item`.`wall` AND `item`.`changed` > '%s'
 259                         AND `item`.`visible` $sql_extra
 260                         ORDER BY `item`.`parent` ".$sort.", `item`.`received` ASC LIMIT 0, 300",
 261                         intval($owner_id),
 262                         DBA::escape($check_date),
 263                         DBA::escape($sort)
 264                 );
 265
 266                 $ids = [];
 267                 foreach ($r as $item) {
 268                         $ids[] = $item['id'];
 269                 }
 270
 271                 if (!empty($ids)) {
 272                         $ret = Item::select(Item::DELIVER_FIELDLIST, ['id' => $ids]);
 273                         $items = Item::inArray($ret);
 274                 } else {
 275                         $items = [];
 276                 }
 277
 278                 /*
 279                  * Will check further below if this actually returned results.
 280                  * We will provide an empty feed if that is the case.
 281                  */
 282
 283                 $doc = new DOMDocument('1.0', 'utf-8');
 284                 $doc->formatOutput = true;
 285
 286                 $alternatelink = $owner['url'];
 287
 288                 if (isset($category)) {
 289                         $alternatelink .= "/category/".$category;
 290                 }
 291
 292                 if ($public_feed) {
 293                         $author = "dfrn:owner";
 294                 } else {
 295                         $author = "author";
 296                 }
 297
 298                 $root = self::addHeader($doc, $owner, $author, $alternatelink, true);
 299
 300                 /// @TODO This hook can't work anymore
 301                 //      \Friendica\Core\Hook::callAll('atom_feed', $atom);
 302
 303                 if (!DBA::isResult($items) || $onlyheader) {
 304                         $atom = trim($doc->saveXML());
 305
 306                         Hook::callAll('atom_feed_end', $atom);
 307
 308                         return $atom;
 309                 }
 310
 311                 foreach ($items as $item) {
 312                         // prevent private email from leaking.
 313                         if ($item['network'] == Protocol::MAIL) {
 314                                 continue;
 315                         }
 316
 317                         // public feeds get html, our own nodes use bbcode
 318
 319                         if ($public_feed) {
 320                                 $type = 'html';
 321                                 // catch any email that's in a public conversation and make sure it doesn't leak
 322                                 if ($item['private'] == Item::PRIVATE) {
 323                                         continue;
 324                                 }
 325                         } else {
 326                                 $type = 'text';
 327                         }
 328
 329                         $entry = self::entry($doc, $type, $item, $owner, true);
 330                         if (isset($entry)) {
 331                                 $root->appendChild($entry);
 332                         }
 333                 }
 334
 335                 $atom = trim($doc->saveXML());
 336
 337                 Hook::callAll('atom_feed_end', $atom);
 338
 339                 return $atom;
 340         }
 341
 342         /**
 343          * Generate an atom entry for a given item id
 344          *
 345          * @param int     $item_id      The item id
 346          * @param boolean $conversation Show the conversation. If false show the single post.
 347          *
 348          * @return string DFRN feed entry
 349          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 350          * @throws \ImagickException
 351          */
 352         public static function itemFeed($item_id, $conversation = false)
 353         {
 354                 if ($conversation) {
 355                         $condition = ['parent' => $item_id];
 356                 } else {
 357                         $condition = ['id' => $item_id];
 358                 }
 359
 360                 $ret = Item::select(Item::DELIVER_FIELDLIST, $condition);
 361                 $items = Item::inArray($ret);
 362                 if (!DBA::isResult($items)) {
 363                         return '';
 364                 }
 365
 366                 $item = $items[0];
 367
 368                 if ($item['uid'] != 0) {
 369                         $owner = User::getOwnerDataById($item['uid']);
 370                         if (!$owner) {
 371                                 return '';
 372                         }
 373                 } else {
 374                         $owner = ['uid' => 0, 'nick' => 'feed-item'];
 375                 }
 376
 377                 $doc = new DOMDocument('1.0', 'utf-8');
 378                 $doc->formatOutput = true;
 379                 $type = 'html';
 380
 381                 if ($conversation) {
 382                         $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 383                         $doc->appendChild($root);
 384
 385                         $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 386                         $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 387                         $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 388                         $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 389                         $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 390                         $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 391                         $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 392                         $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 393                         $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 394
 395                         //$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 396
 397                         foreach ($items as $item) {
 398                                 $entry = self::entry($doc, $type, $item, $owner, true, 0);
 399                                 if (isset($entry)) {
 400                                         $root->appendChild($entry);
 401                                 }
 402                         }
 403                 } else {
 404                         self::entry($doc, $type, $item, $owner, true, 0, true);
 405                 }
 406
 407                 $atom = trim($doc->saveXML());
 408                 return $atom;
 409         }
 410
 411         /**
 412          * Create XML text for DFRN mails
 413          *
 414          * @param array $item  message elements
 415          * @param array $owner Owner record
 416          *
 417          * @return string DFRN mail
 418          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 419          * @todo  Find proper type-hints
 420          */
 421         public static function mail($item, $owner)
 422         {
 423                 $doc = new DOMDocument('1.0', 'utf-8');
 424                 $doc->formatOutput = true;
 425
 426                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 427
 428                 $mail = $doc->createElement("dfrn:mail");
 429                 $sender = $doc->createElement("dfrn:sender");
 430
 431                 XML::addElement($doc, $sender, "dfrn:name", $owner['name']);
 432                 XML::addElement($doc, $sender, "dfrn:uri", $owner['url']);
 433                 XML::addElement($doc, $sender, "dfrn:avatar", $owner['thumb']);
 434
 435                 $mail->appendChild($sender);
 436
 437                 XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 438                 XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
 439                 XML::addElement($doc, $mail, "dfrn:sentdate", DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
 440                 XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 441                 XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 442
 443                 $root->appendChild($mail);
 444
 445                 return trim($doc->saveXML());
 446         }
 447
 448         /**
 449          * Create XML text for DFRN friend suggestions
 450          *
 451          * @param array $item  suggestion elements
 452          * @param array $owner Owner record
 453          *
 454          * @return string DFRN suggestions
 455          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 456          * @todo  Find proper type-hints
 457          */
 458         public static function fsuggest($item, $owner)
 459         {
 460                 $doc = new DOMDocument('1.0', 'utf-8');
 461                 $doc->formatOutput = true;
 462
 463                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 464
 465                 $suggest = $doc->createElement("dfrn:suggest");
 466
 467                 XML::addElement($doc, $suggest, "dfrn:url", $item['url']);
 468                 XML::addElement($doc, $suggest, "dfrn:name", $item['name']);
 469                 XML::addElement($doc, $suggest, "dfrn:photo", $item['photo']);
 470                 XML::addElement($doc, $suggest, "dfrn:request", $item['request']);
 471                 XML::addElement($doc, $suggest, "dfrn:note", $item['note']);
 472
 473                 $root->appendChild($suggest);
 474
 475                 return trim($doc->saveXML());
 476         }
 477
 478         /**
 479          * Create XML text for DFRN relocations
 480          *
 481          * @param array $owner Owner record
 482          * @param int   $uid   User ID
 483          *
 484          * @return string DFRN relocations
 485          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 486          * @todo  Find proper type-hints
 487          */
 488         public static function relocate($owner, $uid)
 489         {
 490
 491                 /* get site pubkey. this could be a new installation with no site keys*/
 492                 $pubkey = DI::config()->get('system', 'site_pubkey');
 493                 if (! $pubkey) {
 494                         $res = Crypto::newKeypair(1024);
 495                         DI::config()->set('system', 'site_prvkey', $res['prvkey']);
 496                         DI::config()->set('system', 'site_pubkey', $res['pubkey']);
 497                 }
 498
 499                 $rp = q(
 500                         "SELECT `resource-id` , `scale`, type FROM `photo`
 501                                 WHERE `profile` = 1 AND `uid` = %d ORDER BY scale;",
 502                         $uid
 503                 );
 504                 $photos = [];
 505                 $ext = Images::supportedTypes();
 506
 507                 foreach ($rp as $p) {
 508                         $photos[$p['scale']] = DI::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
 509                 }
 510
 511
 512                 $doc = new DOMDocument('1.0', 'utf-8');
 513                 $doc->formatOutput = true;
 514
 515                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 516
 517                 $relocate = $doc->createElement("dfrn:relocate");
 518
 519                 XML::addElement($doc, $relocate, "dfrn:url", $owner['url']);
 520                 XML::addElement($doc, $relocate, "dfrn:name", $owner['name']);
 521                 XML::addElement($doc, $relocate, "dfrn:addr", $owner['addr']);
 522                 XML::addElement($doc, $relocate, "dfrn:avatar", $owner['avatar']);
 523                 XML::addElement($doc, $relocate, "dfrn:photo", $photos[4]);
 524                 XML::addElement($doc, $relocate, "dfrn:thumb", $photos[5]);
 525                 XML::addElement($doc, $relocate, "dfrn:micro", $photos[6]);
 526                 XML::addElement($doc, $relocate, "dfrn:request", $owner['request']);
 527                 XML::addElement($doc, $relocate, "dfrn:confirm", $owner['confirm']);
 528                 XML::addElement($doc, $relocate, "dfrn:notify", $owner['notify']);
 529                 XML::addElement($doc, $relocate, "dfrn:poll", $owner['poll']);
 530                 XML::addElement($doc, $relocate, "dfrn:sitepubkey", DI::config()->get('system', 'site_pubkey'));
 531
 532                 $root->appendChild($relocate);
 533
 534                 return trim($doc->saveXML());
 535         }
 536
 537         /**
 538          * Adds the header elements for the DFRN protocol
 539          *
 540          * @param DOMDocument $doc           XML document
 541          * @param array       $owner         Owner record
 542          * @param string      $authorelement Element name for the author
 543          * @param string      $alternatelink link to profile or category
 544          * @param bool        $public        Is it a header for public posts?
 545          *
 546          * @return object XML root object
 547          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 548          * @todo  Find proper type-hints
 549          */
 550         private static function addHeader(DOMDocument $doc, $owner, $authorelement, $alternatelink = "", $public = false)
 551         {
 552
 553                 if ($alternatelink == "") {
 554                         $alternatelink = $owner['url'];
 555                 }
 556
 557                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 558                 $doc->appendChild($root);
 559
 560                 $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 561                 $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 562                 $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 563                 $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 564                 $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 565                 $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 566                 $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 567                 $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 568                 $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 569
 570                 XML::addElement($doc, $root, "id", DI::baseUrl()."/profile/".$owner["nick"]);
 571                 XML::addElement($doc, $root, "title", $owner["name"]);
 572
 573                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION];
 574                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 575
 576                 $attributes = ["rel" => "license", "href" => "http://creativecommons.org/licenses/by/3.0/"];
 577                 XML::addElement($doc, $root, "link", "", $attributes);
 578
 579                 $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $alternatelink];
 580                 XML::addElement($doc, $root, "link", "", $attributes);
 581
 582
 583                 if ($public) {
 584                         // DFRN itself doesn't uses this. But maybe someone else wants to subscribe to the public feed.
 585                         OStatus::hublinks($doc, $root, $owner["nick"]);
 586
 587                         $attributes = ["rel" => "salmon", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 588                         XML::addElement($doc, $root, "link", "", $attributes);
 589
 590                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-replies", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 591                         XML::addElement($doc, $root, "link", "", $attributes);
 592
 593                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-mention", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 594                         XML::addElement($doc, $root, "link", "", $attributes);
 595                 }
 596
 597                 // For backward compatibility we keep this element
 598                 if ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
 599                         XML::addElement($doc, $root, "dfrn:community", 1);
 600                 }
 601
 602                 // The former element is replaced by this one
 603                 XML::addElement($doc, $root, "dfrn:account_type", $owner["account-type"]);
 604
 605                 /// @todo We need a way to transmit the different page flags like "User::PAGE_FLAGS_PRVGROUP"
 606
 607                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 608
 609                 $author = self::addAuthor($doc, $owner, $authorelement, $public);
 610                 $root->appendChild($author);
 611
 612                 return $root;
 613         }
 614
 615         /**
 616          * Adds the author element in the header for the DFRN protocol
 617          *
 618          * @param DOMDocument $doc           XML document
 619          * @param array       $owner         Owner record
 620          * @param string      $authorelement Element name for the author
 621          * @param boolean     $public        boolean
 622          *
 623          * @return \DOMElement XML author object
 624          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 625          * @todo  Find proper type-hints
 626          */
 627         private static function addAuthor(DOMDocument $doc, array $owner, $authorelement, $public)
 628         {
 629                 // Should the profile be "unsearchable" in the net? Then add the "hide" element
 630                 $hide = DBA::exists('profile', ['uid' => $owner['uid'], 'net-publish' => false]);
 631
 632                 $author = $doc->createElement($authorelement);
 633
 634                 $namdate = DateTimeFormat::utc($owner['name-date'].'+00:00', DateTimeFormat::ATOM);
 635                 $picdate = DateTimeFormat::utc($owner['avatar-date'].'+00:00', DateTimeFormat::ATOM);
 636
 637                 $attributes = [];
 638
 639                 if (!$public || !$hide) {
 640                         $attributes = ["dfrn:updated" => $namdate];
 641                 }
 642
 643                 XML::addElement($doc, $author, "name", $owner["name"], $attributes);
 644                 XML::addElement($doc, $author, "uri", DI::baseUrl().'/profile/'.$owner["nickname"], $attributes);
 645                 XML::addElement($doc, $author, "dfrn:handle", $owner["addr"], $attributes);
 646
 647                 $attributes = ["rel" => "photo", "type" => "image/jpeg",
 648                                         "media:width" => 300, "media:height" => 300, "href" => $owner['photo']];
 649
 650                 if (!$public || !$hide) {
 651                         $attributes["dfrn:updated"] = $picdate;
 652                 }
 653
 654                 XML::addElement($doc, $author, "link", "", $attributes);
 655
 656                 $attributes["rel"] = "avatar";
 657                 XML::addElement($doc, $author, "link", "", $attributes);
 658
 659                 if ($hide) {
 660                         XML::addElement($doc, $author, "dfrn:hide", "true");
 661                 }
 662
 663                 // The following fields will only be generated if the data isn't meant for a public feed
 664                 if ($public) {
 665                         return $author;
 666                 }
 667
 668                 $birthday = feed_birthday($owner['uid'], $owner['timezone']);
 669
 670                 if ($birthday) {
 671                         XML::addElement($doc, $author, "dfrn:birthday", $birthday);
 672                 }
 673
 674                 // Only show contact details when we are allowed to
 675                 $profile = DBA::selectFirst('owner-view',
 676                         ['about', 'name', 'homepage', 'nickname', 'timezone', 'locality', 'region', 'country-name', 'pub_keywords', 'xmpp', 'dob'],
 677                         ['uid' => $owner['uid'], 'hidewall' => false]);
 678                 if (DBA::isResult($profile)) {
 679                         XML::addElement($doc, $author, "poco:displayName", $profile["name"]);
 680                         XML::addElement($doc, $author, "poco:updated", $namdate);
 681
 682                         if (trim($profile["dob"]) > DBA::NULL_DATE) {
 683                                 XML::addElement($doc, $author, "poco:birthday", "0000-".date("m-d", strtotime($profile["dob"])));
 684                         }
 685
 686                         XML::addElement($doc, $author, "poco:note", $profile["about"]);
 687                         XML::addElement($doc, $author, "poco:preferredUsername", $profile["nickname"]);
 688
 689                         $savetz = date_default_timezone_get();
 690                         date_default_timezone_set($profile["timezone"]);
 691                         XML::addElement($doc, $author, "poco:utcOffset", date("P"));
 692                         date_default_timezone_set($savetz);
 693
 694                         if (trim($profile["homepage"]) != "") {
 695                                 $urls = $doc->createElement("poco:urls");
 696                                 XML::addElement($doc, $urls, "poco:type", "homepage");
 697                                 XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
 698                                 XML::addElement($doc, $urls, "poco:primary", "true");
 699                                 $author->appendChild($urls);
 700                         }
 701
 702                         if (trim($profile["pub_keywords"]) != "") {
 703                                 $keywords = explode(",", $profile["pub_keywords"]);
 704
 705                                 foreach ($keywords as $keyword) {
 706                                         XML::addElement($doc, $author, "poco:tags", trim($keyword));
 707                                 }
 708                         }
 709
 710                         if (trim($profile["xmpp"]) != "") {
 711                                 $ims = $doc->createElement("poco:ims");
 712                                 XML::addElement($doc, $ims, "poco:type", "xmpp");
 713                                 XML::addElement($doc, $ims, "poco:value", $profile["xmpp"]);
 714                                 XML::addElement($doc, $ims, "poco:primary", "true");
 715                                 $author->appendChild($ims);
 716                         }
 717
 718                         if (trim($profile["locality"].$profile["region"].$profile["country-name"]) != "") {
 719                                 $element = $doc->createElement("poco:address");
 720
 721                                 XML::addElement($doc, $element, "poco:formatted", Profile::formatLocation($profile));
 722
 723                                 if (trim($profile["locality"]) != "") {
 724                                         XML::addElement($doc, $element, "poco:locality", $profile["locality"]);
 725                                 }
 726
 727                                 if (trim($profile["region"]) != "") {
 728                                         XML::addElement($doc, $element, "poco:region", $profile["region"]);
 729                                 }
 730
 731                                 if (trim($profile["country-name"]) != "") {
 732                                         XML::addElement($doc, $element, "poco:country", $profile["country-name"]);
 733                                 }
 734
 735                                 $author->appendChild($element);
 736                         }
 737                 }
 738
 739                 return $author;
 740         }
 741
 742         /**
 743          * Adds the author elements in the "entry" elements of the DFRN protocol
 744          *
 745          * @param DOMDocument $doc         XML document
 746          * @param string $element     Element name for the author
 747          * @param string $contact_url Link of the contact
 748          * @param array  $item        Item elements
 749          *
 750          * @return \DOMElement XML author object
 751          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 752          * @todo  Find proper type-hints
 753          */
 754         private static function addEntryAuthor(DOMDocument $doc, $element, $contact_url, $item)
 755         {
 756                 $author = $doc->createElement($element);
 757
 758                 $contact = Contact::getByURLForUser($contact_url, $item["uid"], false, ['url', 'name', 'addr', 'photo']);
 759                 if (!empty($contact)) {
 760                         XML::addElement($doc, $author, "name", $contact["name"]);
 761                         XML::addElement($doc, $author, "uri", $contact["url"]);
 762                         XML::addElement($doc, $author, "dfrn:handle", $contact["addr"]);
 763
 764                         /// @Todo
 765                         /// - Check real image type and image size
 766                         /// - Check which of these boths elements we should use
 767                         $attributes = [
 768                                 "rel" => "photo",
 769                                 "type" => "image/jpeg",
 770                                 "media:width" => 80,
 771                                 "media:height" => 80,
 772                                 "href" => $contact["photo"]];
 773                         XML::addElement($doc, $author, "link", "", $attributes);
 774
 775                         $attributes = [
 776                                 "rel" => "avatar",
 777                                 "type" => "image/jpeg",
 778                                 "media:width" => 80,
 779                                 "media:height" => 80,
 780                                 "href" => $contact["photo"]];
 781                         XML::addElement($doc, $author, "link", "", $attributes);
 782                 }
 783
 784                 return $author;
 785         }
 786
 787         /**
 788          * Adds the activity elements
 789          *
 790          * @param DOMDocument $doc      XML document
 791          * @param string      $element  Element name for the activity
 792          * @param string      $activity activity value
 793          *
 794          * @return \DOMElement XML activity object
 795          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 796          * @todo  Find proper type-hints
 797          */
 798         private static function createActivity(DOMDocument $doc, $element, $activity)
 799         {
 800                 if ($activity) {
 801                         $entry = $doc->createElement($element);
 802
 803                         $r = XML::parseString($activity);
 804                         if (!$r) {
 805                                 return false;
 806                         }
 807
 808                         if ($r->type) {
 809                                 XML::addElement($doc, $entry, "activity:object-type", $r->type);
 810                         }
 811
 812                         if ($r->id) {
 813                                 XML::addElement($doc, $entry, "id", $r->id);
 814                         }
 815
 816                         if ($r->title) {
 817                                 XML::addElement($doc, $entry, "title", $r->title);
 818                         }
 819
 820                         if ($r->link) {
 821                                 if (substr($r->link, 0, 1) == '<') {
 822                                         if (strstr($r->link, '&') && (! strstr($r->link, '&amp;'))) {
 823                                                 $r->link = str_replace('&', '&amp;', $r->link);
 824                                         }
 825
 826                                         $r->link = preg_replace('/\<link(.*?)\"\>/', '<link$1"/>', $r->link);
 827
 828                                         // XML does need a single element as root element so we add a dummy element here
 829                                         $data = XML::parseString("<dummy>" . $r->link . "</dummy>");
 830                                         if (is_object($data)) {
 831                                                 foreach ($data->link as $link) {
 832                                                         $attributes = [];
 833                                                         foreach ($link->attributes() as $parameter => $value) {
 834                                                                 $attributes[$parameter] = $value;
 835                                                         }
 836                                                         XML::addElement($doc, $entry, "link", "", $attributes);
 837                                                 }
 838                                         }
 839                                 } else {
 840                                         $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $r->link];
 841                                         XML::addElement($doc, $entry, "link", "", $attributes);
 842                                 }
 843                         }
 844                         if ($r->content) {
 845                                 XML::addElement($doc, $entry, "content", BBCode::convert($r->content), ["type" => "html"]);
 846                         }
 847
 848                         return $entry;
 849                 }
 850
 851                 return false;
 852         }
 853
 854         /**
 855          * Adds the elements for attachments
 856          *
 857          * @param object $doc  XML document
 858          * @param object $root XML root
 859          * @param array  $item Item element
 860          *
 861          * @return void XML attachment object
 862          * @todo  Find proper type-hints
 863          */
 864         private static function getAttachment($doc, $root, $item)
 865         {
 866                 $arr = explode('[/attach],', $item['attach']);
 867                 if (count($arr)) {
 868                         foreach ($arr as $r) {
 869                                 $matches = false;
 870                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 871                                 if ($cnt) {
 872                                         $attributes = ["rel" => "enclosure",
 873                                                         "href" => $matches[1],
 874                                                         "type" => $matches[3]];
 875
 876                                         if (intval($matches[2])) {
 877                                                 $attributes["length"] = intval($matches[2]);
 878                                         }
 879
 880                                         if (trim($matches[4]) != "") {
 881                                                 $attributes["title"] = trim($matches[4]);
 882                                         }
 883
 884                                         XML::addElement($doc, $root, "link", "", $attributes);
 885                                 }
 886                         }
 887                 }
 888         }
 889
 890         /**
 891          * Adds the "entry" elements for the DFRN protocol
 892          *
 893          * @param DOMDocument $doc     XML document
 894          * @param string      $type    "text" or "html"
 895          * @param array       $item    Item element
 896          * @param array       $owner   Owner record
 897          * @param bool        $comment Trigger the sending of the "comment" element
 898          * @param int         $cid     Contact ID of the recipient
 899          * @param bool        $single  If set, the entry is created as an XML document with a single "entry" element
 900          *
 901          * @return null|\DOMElement XML entry object
 902          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 903          * @throws \ImagickException
 904          * @todo  Find proper type-hints
 905          */
 906         private static function entry(DOMDocument $doc, $type, array $item, array $owner, $comment = false, $cid = 0, $single = false)
 907         {
 908                 $mentioned = [];
 909
 910                 if (!$item['parent']) {
 911                         Logger::notice('Item without parent found.', ['type' => $type, 'item' => $item]);
 912                         return null;
 913                 }
 914
 915                 if ($item['deleted']) {
 916                         $attributes = ["ref" => $item['uri'], "when" => DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM)];
 917                         return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 918                 }
 919
 920                 if (!$single) {
 921                         $entry = $doc->createElement("entry");
 922                 } else {
 923                         $entry = $doc->createElementNS(ActivityNamespace::ATOM1, 'entry');
 924                         $doc->appendChild($entry);
 925
 926                         $entry->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 927                         $entry->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 928                         $entry->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 929                         $entry->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 930                         $entry->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 931                         $entry->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 932                         $entry->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 933                         $entry->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 934                         $entry->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 935                 }
 936
 937                 if ($item['private'] == Item::PRIVATE) {
 938                         $body = Item::fixPrivatePhotos($item['body'], $owner['uid'], $item, $cid);
 939                 } else {
 940                         $body = $item['body'];
 941                 }
 942
 943                 // Remove the abstract element. It is only locally important.
 944                 $body = BBCode::stripAbstract($body);
 945
 946                 $htmlbody = '';
 947                 if ($type == 'html') {
 948                         $htmlbody = $body;
 949
 950                         if ($item['title'] != "") {
 951                                 $htmlbody = "[b]" . $item['title'] . "[/b]\n\n" . $htmlbody;
 952                         }
 953
 954                         $htmlbody = BBCode::convert($htmlbody, false, BBCode::OSTATUS);
 955                 }
 956
 957                 $author = self::addEntryAuthor($doc, "author", $item["author-link"], $item);
 958                 $entry->appendChild($author);
 959
 960                 $dfrnowner = self::addEntryAuthor($doc, "dfrn:owner", $item["owner-link"], $item);
 961                 $entry->appendChild($dfrnowner);
 962
 963                 if ($item['gravity'] != GRAVITY_PARENT) {
 964                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 965                         $parent = Item::selectFirst(['guid', 'plink'], ['uri' => $parent_item, 'uid' => $item['uid']]);
 966                         $attributes = ["ref" => $parent_item, "type" => "text/html",
 967                                                 "href" => $parent['plink'],
 968                                                 "dfrn:diaspora_guid" => $parent['guid']];
 969                         XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 970                 }
 971
 972                 // Add conversation data. This is used for OStatus
 973                 $conversation_href = DI::baseUrl()."/display/".$item["parent-guid"];
 974                 $conversation_uri = $conversation_href;
 975
 976                 if (isset($parent_item)) {
 977                         $conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $item['parent-uri']]);
 978                         if (DBA::isResult($conversation)) {
 979                                 if ($conversation['conversation-uri'] != '') {
 980                                         $conversation_uri = $conversation['conversation-uri'];
 981                                 }
 982                                 if ($conversation['conversation-href'] != '') {
 983                                         $conversation_href = $conversation['conversation-href'];
 984                                 }
 985                         }
 986                 }
 987
 988                 $attributes = [
 989                                 "href" => $conversation_href,
 990                                 "ref" => $conversation_uri];
 991
 992                 XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
 993
 994                 XML::addElement($doc, $entry, "id", $item["uri"]);
 995                 XML::addElement($doc, $entry, "title", $item["title"]);
 996
 997                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"] . "+00:00", DateTimeFormat::ATOM));
 998                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"] . "+00:00", DateTimeFormat::ATOM));
 999
1000                 // "dfrn:env" is used to read the content
1001                 XML::addElement($doc, $entry, "dfrn:env", Strings::base64UrlEncode($body, true));
1002
1003                 // The "content" field is not read by the receiver. We could remove it when the type is "text"
1004                 // We keep it at the moment, maybe there is some old version that doesn't read "dfrn:env"
1005                 XML::addElement($doc, $entry, "content", (($type == 'html') ? $htmlbody : $body), ["type" => $type]);
1006
1007                 // We save this value in "plink". Maybe we should read it from there as well?
1008                 XML::addElement(
1009                         $doc,
1010                         $entry,
1011                         "link",
1012                         "",
1013                         ["rel" => "alternate", "type" => "text/html",
1014                                  "href" => DI::baseUrl() . "/display/" . $item["guid"]]
1015                 );
1016
1017                 // "comment-allow" is some old fashioned stuff for old Friendica versions.
1018                 // It is included in the rewritten code for completeness
1019                 if ($comment) {
1020                         XML::addElement($doc, $entry, "dfrn:comment-allow", 1);
1021                 }
1022
1023                 if ($item['location']) {
1024                         XML::addElement($doc, $entry, "dfrn:location", $item['location']);
1025                 }
1026
1027                 if ($item['coord']) {
1028                         XML::addElement($doc, $entry, "georss:point", $item['coord']);
1029                 }
1030
1031                 if ($item['private']) {
1032                         // Friendica versions prior to 2020.3 can't handle "unlisted" properly. So we can only transmit public and private
1033                         XML::addElement($doc, $entry, "dfrn:private", ($item['private'] == Item::PRIVATE ? Item::PRIVATE : Item::PUBLIC));
1034                         XML::addElement($doc, $entry, "dfrn:unlisted", $item['private'] == Item::UNLISTED);
1035                 }
1036
1037                 if ($item['extid']) {
1038                         XML::addElement($doc, $entry, "dfrn:extid", $item['extid']);
1039                 }
1040
1041                 if ($item['post-type'] == Item::PT_PAGE) {
1042                         XML::addElement($doc, $entry, "dfrn:bookmark", "true");
1043                 }
1044
1045                 if ($item['app']) {
1046                         XML::addElement($doc, $entry, "statusnet:notice_info", "", ["local_id" => $item['id'], "source" => $item['app']]);
1047                 }
1048
1049                 XML::addElement($doc, $entry, "dfrn:diaspora_guid", $item["guid"]);
1050
1051                 // The signed text contains the content in Markdown, the sender handle and the signatur for the content
1052                 // It is needed for relayed comments to Diaspora.
1053                 if ($item['signed_text']) {
1054                         $sign = base64_encode(json_encode(['signed_text' => $item['signed_text'],'signature' => '','signer' => '']));
1055                         XML::addElement($doc, $entry, "dfrn:diaspora_signature", $sign);
1056                 }
1057
1058                 XML::addElement($doc, $entry, "activity:verb", self::constructVerb($item));
1059
1060                 if ($item['object-type'] != "") {
1061                         XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
1062                 } elseif ($item['gravity'] == GRAVITY_PARENT) {
1063                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::NOTE);
1064                 } else {
1065                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::COMMENT);
1066                 }
1067
1068                 $actobj = self::createActivity($doc, "activity:object", $item['object']);
1069                 if ($actobj) {
1070                         $entry->appendChild($actobj);
1071                 }
1072
1073                 $actarg = self::createActivity($doc, "activity:target", $item['target']);
1074                 if ($actarg) {
1075                         $entry->appendChild($actarg);
1076                 }
1077
1078                 $tags = Tag::getByURIId($item['uri-id']);
1079
1080                 if (count($tags)) {
1081                         foreach ($tags as $tag) {
1082                                 if (($type != 'html') || ($tag['type'] == Tag::HASHTAG)) {
1083                                         XML::addElement($doc, $entry, "category", "", ["scheme" => "X-DFRN:" . Tag::TAG_CHARACTER[$tag['type']] . ":" . $tag['url'], "term" => $tag['name']]);
1084                                 }
1085                                 if ($tag['type'] != Tag::HASHTAG) {
1086                                         $mentioned[$tag['url']] = $tag['url'];
1087                                 }
1088                         }
1089                 }
1090
1091                 foreach ($mentioned as $mention) {
1092                         $condition = ['uid' => $owner["uid"], 'nurl' => Strings::normaliseLink($mention)];
1093                         $contact = DBA::selectFirst('contact', ['forum', 'prv'], $condition);
1094
1095                         if (DBA::isResult($contact) && ($contact["forum"] || $contact["prv"])) {
1096                                 XML::addElement(
1097                                         $doc,
1098                                         $entry,
1099                                         "link",
1100                                         "",
1101                                         ["rel" => "mentioned",
1102                                                         "ostatus:object-type" => Activity\ObjectType::GROUP,
1103                                                         "href" => $mention]
1104                                 );
1105                         } else {
1106                                 XML::addElement(
1107                                         $doc,
1108                                         $entry,
1109                                         "link",
1110                                         "",
1111                                         ["rel" => "mentioned",
1112                                                         "ostatus:object-type" => Activity\ObjectType::PERSON,
1113                                                         "href" => $mention]
1114                                 );
1115                         }
1116                 }
1117
1118                 self::getAttachment($doc, $entry, $item);
1119
1120                 return $entry;
1121         }
1122
1123         /**
1124          * encrypts data via AES
1125          *
1126          * @param string $data The data that is to be encrypted
1127          * @param string $key  The AES key
1128          *
1129          * @return string encrypted data
1130          */
1131         private static function aesEncrypt($data, $key)
1132         {
1133                 return openssl_encrypt($data, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1134         }
1135
1136         /**
1137          * decrypts data via AES
1138          *
1139          * @param string $encrypted The encrypted data
1140          * @param string $key       The AES key
1141          *
1142          * @return string decrypted data
1143          */
1144         public static function aesDecrypt($encrypted, $key)
1145         {
1146                 return openssl_decrypt($encrypted, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1147         }
1148
1149         /**
1150          * Delivers the atom content to the contacts
1151          *
1152          * @param array  $owner    Owner record
1153          * @param array  $contact  Contact record of the receiver
1154          * @param string $atom     Content that will be transmitted
1155          * @param bool   $dissolve (to be documented)
1156          *
1157          * @return int Deliver status. Negative values mean an error.
1158          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1159          * @throws \ImagickException
1160          * @todo  Add array type-hint for $owner, $contact
1161          */
1162         public static function deliver($owner, $contact, $atom, $dissolve = false)
1163         {
1164                 $idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);
1165
1166                 if ($contact['duplex'] && $contact['dfrn-id']) {
1167                         $idtosend = '0:' . $orig_id;
1168                 }
1169                 if ($contact['duplex'] && $contact['issued-id']) {
1170                         $idtosend = '1:' . $orig_id;
1171                 }
1172
1173                 $rino = DI::config()->get('system', 'rino_encrypt');
1174                 $rino = intval($rino);
1175
1176                 Logger::log("Local rino version: ". $rino, Logger::DEBUG);
1177
1178                 $ssl_val = intval(DI::config()->get('system', 'ssl_policy'));
1179
1180                 switch ($ssl_val) {
1181                         case BaseURL::SSL_POLICY_FULL:
1182                                 $ssl_policy = 'full';
1183                                 break;
1184                         case BaseURL::SSL_POLICY_SELFSIGN:
1185                                 $ssl_policy = 'self';
1186                                 break;
1187                         case BaseURL::SSL_POLICY_NONE:
1188                         default:
1189                                 $ssl_policy = 'none';
1190                                 break;
1191                 }
1192
1193                 $url = $contact['notify'] . '&dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino='.$rino : '');
1194
1195                 Logger::log('dfrn_deliver: ' . $url);
1196
1197                 $curlResult = DI::httpRequest()->get($url);
1198
1199                 if ($curlResult->isTimeout()) {
1200                         return -2; // timed out
1201                 }
1202
1203                 $xml = $curlResult->getBody();
1204
1205                 $curl_stat = $curlResult->getReturnCode();
1206                 if (empty($curl_stat)) {
1207                         return -3; // timed out
1208                 }
1209
1210                 Logger::log('dfrn_deliver: ' . $xml, Logger::DATA);
1211
1212                 if (empty($xml)) {
1213                         return 3;
1214                 }
1215
1216                 if (strpos($xml, '<?xml') === false) {
1217                         Logger::log('dfrn_deliver: no valid XML returned');
1218                         Logger::log('dfrn_deliver: returned XML: ' . $xml, Logger::DATA);
1219                         return 3;
1220                 }
1221
1222                 $res = XML::parseString($xml);
1223
1224                 if (!is_object($res) || (intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
1225                         if (empty($res->status)) {
1226                                 $status = 3;
1227                         } else {
1228                                 $status = $res->status;
1229                         }
1230
1231                         return $status;
1232                 }
1233
1234                 $postvars     = [];
1235                 $sent_dfrn_id = hex2bin((string) $res->dfrn_id);
1236                 $challenge    = hex2bin((string) $res->challenge);
1237                 $perm         = (($res->perm) ? $res->perm : null);
1238                 $dfrn_version = floatval($res->dfrn_version ?: 2.0);
1239                 $rino_remote_version = intval($res->rino);
1240                 $page         = (($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? 1 : 0);
1241
1242                 Logger::log("Remote rino version: ".$rino_remote_version." for ".$contact["url"], Logger::DEBUG);
1243
1244                 if ($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
1245                         $page = 2;
1246                 }
1247
1248                 $final_dfrn_id = '';
1249
1250                 if ($perm) {
1251                         if ((($perm == 'rw') && !intval($contact['writable']))
1252                                 || (($perm == 'r') && intval($contact['writable']))
1253                         ) {
1254                                 DBA::update('contact', ['writable' => ($perm == 'rw')], ['id' => $contact['id']]);
1255
1256                                 $contact['writable'] = (string) 1 - intval($contact['writable']);
1257                         }
1258                 }
1259
1260                 if (($contact['duplex'] && strlen($contact['pubkey']))
1261                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1262                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1263                 ) {
1264                         openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
1265                         openssl_public_decrypt($challenge, $postvars['challenge'], $contact['pubkey']);
1266                 } else {
1267                         openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
1268                         openssl_private_decrypt($challenge, $postvars['challenge'], $contact['prvkey']);
1269                 }
1270
1271                 $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
1272
1273                 if (strpos($final_dfrn_id, ':') == 1) {
1274                         $final_dfrn_id = substr($final_dfrn_id, 2);
1275                 }
1276
1277                 if ($final_dfrn_id != $orig_id) {
1278                         Logger::log('dfrn_deliver: wrong dfrn_id.');
1279                         // did not decode properly - cannot trust this site
1280                         return 3;
1281                 }
1282
1283                 $postvars['dfrn_id']      = $idtosend;
1284                 $postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
1285                 if ($dissolve) {
1286                         $postvars['dissolve'] = '1';
1287                 }
1288
1289                 if ((($contact['rel']) && ($contact['rel'] != Contact::SHARING) && (! $contact['blocked'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1290                         $postvars['data'] = $atom;
1291                         $postvars['perm'] = 'rw';
1292                 } else {
1293                         $postvars['data'] = str_replace('<dfrn:comment-allow>1', '<dfrn:comment-allow>0', $atom);
1294                         $postvars['perm'] = 'r';
1295                 }
1296
1297                 $postvars['ssl_policy'] = $ssl_policy;
1298
1299                 if ($page) {
1300                         $postvars['page'] = $page;
1301                 }
1302
1303
1304                 if ($rino > 0 && $rino_remote_version > 0 && (! $dissolve)) {
1305                         Logger::log('rino version: '. $rino_remote_version);
1306
1307                         switch ($rino_remote_version) {
1308                                 case 1:
1309                                         $key = openssl_random_pseudo_bytes(16);
1310                                         $data = self::aesEncrypt($postvars['data'], $key);
1311                                         break;
1312
1313                                 default:
1314                                         Logger::log("rino: invalid requested version '$rino_remote_version'");
1315                                         return -8;
1316                         }
1317
1318                         $postvars['rino'] = $rino_remote_version;
1319                         $postvars['data'] = bin2hex($data);
1320
1321                         if ($dfrn_version >= 2.1) {
1322                                 if (($contact['duplex'] && strlen($contact['pubkey']))
1323                                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1324                                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1325                                 ) {
1326                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1327                                 } else {
1328                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1329                                 }
1330                         } else {
1331                                 if (($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1332                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1333                                 } else {
1334                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1335                                 }
1336                         }
1337
1338                         Logger::log('md5 rawkey ' . md5($postvars['key']));
1339
1340                         $postvars['key'] = bin2hex($postvars['key']);
1341                 }
1342
1343
1344                 Logger::debug('dfrn_deliver', ['post' => $postvars]);
1345
1346                 $postResult = DI::httpRequest()->post($contact['notify'], $postvars);
1347
1348                 $xml = $postResult->getBody();
1349
1350                 Logger::log('dfrn_deliver: ' . "RECEIVED: " . $xml, Logger::DATA);
1351
1352                 $curl_stat = $postResult->getReturnCode();
1353                 if (empty($curl_stat) || empty($xml)) {
1354                         return -9; // timed out
1355                 }
1356
1357                 if (($curl_stat == 503) && stristr($postResult->getHeader(), 'retry-after')) {
1358                         return -10;
1359                 }
1360
1361                 if (strpos($xml, '<?xml') === false) {
1362                         Logger::log('dfrn_deliver: phase 2: no valid XML returned');
1363                         Logger::log('dfrn_deliver: phase 2: returned XML: ' . $xml, Logger::DATA);
1364                         return 3;
1365                 }
1366
1367                 $res = XML::parseString($xml);
1368
1369                 if (!isset($res->status)) {
1370                         return -11;
1371                 }
1372
1373                 // Possibly old servers had returned an empty value when everything was okay
1374                 if (empty($res->status)) {
1375                         $res->status = 200;
1376                 }
1377
1378                 if (!empty($res->message)) {
1379                         Logger::log('Delivery returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1380                 }
1381
1382                 return intval($res->status);
1383         }
1384
1385         /**
1386          * Transmits atom content to the contacts via the Diaspora transport layer
1387          *
1388          * @param array  $owner   Owner record
1389          * @param array  $contact Contact record of the receiver
1390          * @param string $atom    Content that will be transmitted
1391          *
1392          * @param bool   $public_batch
1393          * @return int Deliver status. Negative values mean an error.
1394          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1395          * @throws \ImagickException
1396          */
1397         public static function transmit($owner, $contact, $atom, $public_batch = false)
1398         {
1399                 if (!$public_batch) {
1400                         if (empty($contact['addr'])) {
1401                                 Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
1402                                 if (Contact::updateFromProbe($contact['id'])) {
1403                                         $new_contact = DBA::selectFirst('contact', ['addr'], ['id' => $contact['id']]);
1404                                         $contact['addr'] = $new_contact['addr'];
1405                                 }
1406
1407                                 if (empty($contact['addr'])) {
1408                                         Logger::log('Unable to find contact handle for ' . $contact['id'] . ' - ' . $contact['url']);
1409                                         return -21;
1410                                 }
1411                         }
1412
1413                         $fcontact = FContact::getByUrl($contact['addr']);
1414                         if (empty($fcontact)) {
1415                                 Logger::log('Unable to find contact details for ' . $contact['id'] . ' - ' . $contact['addr']);
1416                                 return -22;
1417                         }
1418                         $pubkey = $fcontact['pubkey'];
1419                 } else {
1420                         $pubkey = '';
1421                 }
1422
1423                 $envelope = Diaspora::buildMessage($atom, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
1424
1425                 // Create the endpoint for public posts. This is some WIP and should later be added to the probing
1426                 if ($public_batch && empty($contact["batch"])) {
1427                         $parts = parse_url($contact["notify"]);
1428                         $path_parts = explode('/', $parts['path']);
1429                         array_pop($path_parts);
1430                         $parts['path'] =  implode('/', $path_parts);
1431                         $contact["batch"] = Network::unparseURL($parts);
1432                 }
1433
1434                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
1435
1436                 if (empty($dest_url)) {
1437                         Logger::info('Empty destination', ['public' => $public_batch, 'contact' => $contact]);
1438                         return -24;
1439                 }
1440
1441                 $content_type = ($public_batch ? "application/magic-envelope+xml" : "application/json");
1442
1443                 $postResult = DI::httpRequest()->post($dest_url, $envelope, ["Content-Type: " . $content_type]);
1444                 $xml = $postResult->getBody();
1445
1446                 $curl_stat = $postResult->getReturnCode();
1447                 if (empty($curl_stat) || empty($xml)) {
1448                         Logger::log('Empty answer from ' . $contact['id'] . ' - ' . $dest_url);
1449                         return -9; // timed out
1450                 }
1451
1452                 if (($curl_stat == 503) && (stristr($postResult->getHeader(), 'retry-after'))) {
1453                         return -10;
1454                 }
1455
1456                 if (strpos($xml, '<?xml') === false) {
1457                         Logger::log('No valid XML returned from ' . $contact['id'] . ' - ' . $dest_url);
1458                         Logger::log('Returned XML: ' . $xml, Logger::DATA);
1459                         return 3;
1460                 }
1461
1462                 $res = XML::parseString($xml);
1463
1464                 if (empty($res->status)) {
1465                         return -23;
1466                 }
1467
1468                 if (!empty($res->message)) {
1469                         Logger::log('Transmit to ' . $dest_url . ' returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1470                 }
1471
1472                 return intval($res->status);
1473         }
1474
1475         /**
1476          * Fetch the author data from head or entry items
1477          *
1478          * @param object $xpath     XPath object
1479          * @param object $context   In which context should the data be searched
1480          * @param array  $importer  Record of the importer user mixed with contact of the content
1481          * @param string $element   Element name from which the data is fetched
1482          * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
1483          * @param string $xml       optional, default empty
1484          *
1485          * @return array Relevant data of the author
1486          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1487          * @throws \ImagickException
1488          * @todo  Find good type-hints for all parameter
1489          */
1490         private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
1491         {
1492                 $author = [];
1493                 $author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
1494                 $author["link"] = XML::getFirstNodeValue($xpath, $element."/atom:uri/text()", $context);
1495
1496                 $fields = ['id', 'uid', 'url', 'network', 'avatar-date', 'avatar', 'name-date', 'uri-date', 'addr',
1497                         'name', 'nick', 'about', 'location', 'keywords', 'xmpp', 'bdyear', 'bd', 'hidden', 'contact-type'];
1498                 $condition = ["`uid` = ? AND `nurl` = ? AND `network` != ?",
1499                         $importer["importer_uid"], Strings::normaliseLink($author["link"]), Protocol::STATUSNET];
1500                 $contact_old = DBA::selectFirst('contact', $fields, $condition);
1501
1502                 if (DBA::isResult($contact_old)) {
1503                         $author["contact-id"] = $contact_old["id"];
1504                         $author["network"] = $contact_old["network"];
1505                 } else {
1506                         if (!$onlyfetch) {
1507                                 Logger::debug("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml);
1508                         }
1509
1510                         $author["contact-unknown"] = true;
1511                         $author["contact-id"] = $importer["id"];
1512                         $author["network"] = $importer["network"];
1513                         $onlyfetch = true;
1514                 }
1515
1516                 // Until now we aren't serving different sizes - but maybe later
1517                 $avatarlist = [];
1518                 /// @todo check if "avatar" or "photo" would be the best field in the specification
1519                 $avatars = $xpath->query($element . "/atom:link[@rel='avatar']", $context);
1520                 foreach ($avatars as $avatar) {
1521                         $href = "";
1522                         $width = 0;
1523                         foreach ($avatar->attributes as $attributes) {
1524                                 /// @TODO Rewrite these similar if() to one switch
1525                                 if ($attributes->name == "href") {
1526                                         $href = $attributes->textContent;
1527                                 }
1528                                 if ($attributes->name == "width") {
1529                                         $width = $attributes->textContent;
1530                                 }
1531                                 if ($attributes->name == "updated") {
1532                                         $author["avatar-date"] = $attributes->textContent;
1533                                 }
1534                         }
1535                         if (($width > 0) && ($href != "")) {
1536                                 $avatarlist[$width] = $href;
1537                         }
1538                 }
1539
1540                 if (count($avatarlist) > 0) {
1541                         krsort($avatarlist);
1542                         $author["avatar"] = current($avatarlist);
1543                 }
1544
1545                 if (empty($author['avatar']) && !empty($author['link'])) {
1546                         $cid = Contact::getIdForURL($author['link'], 0);
1547                         if (!empty($cid)) {
1548                                 $contact = DBA::selectFirst('contact', ['avatar'], ['id' => $cid]);
1549                                 if (DBA::isResult($contact)) {
1550                                         $author['avatar'] = $contact['avatar'];
1551                                 }
1552                         }
1553                 }
1554
1555                 if (empty($author['avatar'])) {
1556                         Logger::log('Empty author: ' . $xml);
1557                         $author['avatar'] = '';
1558                 }
1559
1560                 if (DBA::isResult($contact_old) && !$onlyfetch) {
1561                         Logger::log("Check if contact details for contact " . $contact_old["id"] . " (" . $contact_old["nick"] . ") have to be updated.", Logger::DEBUG);
1562
1563                         $poco = ["url" => $contact_old["url"], "network" => $contact_old["network"]];
1564
1565                         // When was the last change to name or uri?
1566                         $name_element = $xpath->query($element . "/atom:name", $context)->item(0);
1567                         foreach ($name_element->attributes as $attributes) {
1568                                 if ($attributes->name == "updated") {
1569                                         $poco["name-date"] = $attributes->textContent;
1570                                 }
1571                         }
1572
1573                         $link_element = $xpath->query($element . "/atom:link", $context)->item(0);
1574                         foreach ($link_element->attributes as $attributes) {
1575                                 if ($attributes->name == "updated") {
1576                                         $poco["uri-date"] = $attributes->textContent;
1577                                 }
1578                         }
1579
1580                         // Update contact data
1581                         $value = XML::getFirstNodeValue($xpath, $element . "/dfrn:handle/text()", $context);
1582                         if ($value != "") {
1583                                 $poco["addr"] = $value;
1584                         }
1585
1586                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:displayName/text()", $context);
1587                         if ($value != "") {
1588                                 $poco["name"] = $value;
1589                         }
1590
1591                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:preferredUsername/text()", $context);
1592                         if ($value != "") {
1593                                 $poco["nick"] = $value;
1594                         }
1595
1596                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:note/text()", $context);
1597                         if ($value != "") {
1598                                 $poco["about"] = $value;
1599                         }
1600
1601                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:address/poco:formatted/text()", $context);
1602                         if ($value != "") {
1603                                 $poco["location"] = $value;
1604                         }
1605
1606                         /// @todo Only search for elements with "poco:type" = "xmpp"
1607                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:ims/poco:value/text()", $context);
1608                         if ($value != "") {
1609                                 $poco["xmpp"] = $value;
1610                         }
1611
1612                         /// @todo Add support for the following fields that we don't support by now in the contact table:
1613                         /// - poco:utcOffset
1614                         /// - poco:urls
1615                         /// - poco:locality
1616                         /// - poco:region
1617                         /// - poco:country
1618
1619                         // If the "hide" element is present then the profile isn't searchable.
1620                         $hide = intval(XML::getFirstNodeValue($xpath, $element . "/dfrn:hide/text()", $context) == "true");
1621
1622                         Logger::log("Hidden status for contact " . $contact_old["url"] . ": " . $hide, Logger::DEBUG);
1623
1624                         // If the contact isn't searchable then set the contact to "hidden".
1625                         // Problem: This can be manually overridden by the user.
1626                         if ($hide) {
1627                                 $contact_old["hidden"] = true;
1628                         }
1629
1630                         // Save the keywords into the contact table
1631                         $tags = [];
1632                         $tagelements = $xpath->evaluate($element . "/poco:tags/text()", $context);
1633                         foreach ($tagelements as $tag) {
1634                                 $tags[$tag->nodeValue] = $tag->nodeValue;
1635                         }
1636
1637                         if (count($tags)) {
1638                                 $poco["keywords"] = implode(", ", $tags);
1639                         }
1640
1641                         // "dfrn:birthday" contains the birthday converted to UTC
1642                         $birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1643
1644                         if (strtotime($birthday) > time()) {
1645                                 $bd_timestamp = strtotime($birthday);
1646
1647                                 $poco["bdyear"] = date("Y", $bd_timestamp);
1648                         }
1649
1650                         // "poco:birthday" is the birthday in the format "yyyy-mm-dd"
1651                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1652
1653                         if (!in_array($value, ["", "0000-00-00", DBA::NULL_DATE])) {
1654                                 $bdyear = date("Y");
1655                                 $value = str_replace(["0000", "0001"], $bdyear, $value);
1656
1657                                 if (strtotime($value) < time()) {
1658                                         $value = str_replace($bdyear, $bdyear + 1, $value);
1659                                 }
1660
1661                                 $poco["bd"] = $value;
1662                         }
1663
1664                         $contact = array_merge($contact_old, $poco);
1665
1666                         if ($contact_old["bdyear"] != $contact["bdyear"]) {
1667                                 Event::createBirthday($contact, $birthday);
1668                         }
1669
1670                         $fields = ['name' => $contact['name'], 'nick' => $contact['nick'], 'about' => $contact['about'],
1671                                 'location' => $contact['location'], 'addr' => $contact['addr'], 'keywords' => $contact['keywords'],
1672                                 'bdyear' => $contact['bdyear'], 'bd' => $contact['bd'], 'hidden' => $contact['hidden'],
1673                                 'xmpp' => $contact['xmpp'], 'name-date' => DateTimeFormat::utc($contact['name-date']),
1674                                 'unsearchable' => $contact['hidden'], 'uri-date' => DateTimeFormat::utc($contact['uri-date'])];
1675
1676                         DBA::update('contact', $fields, ['id' => $contact['id'], 'network' => $contact['network']], $contact_old);
1677
1678                         // Update the public contact. Don't set the "hidden" value, this is used differently for public contacts
1679                         unset($fields['hidden']);
1680                         $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($contact_old['url'])];
1681                         DBA::update('contact', $fields, $condition, true);
1682
1683                         Contact::updateAvatar($contact['id'], $author['avatar']);
1684
1685                         $pcid = Contact::getIdForURL($contact_old['url']);
1686                         if (!empty($pcid)) {
1687                                 Contact::updateAvatar($pcid, $author['avatar']);
1688                         }
1689                 }
1690
1691                 return $author;
1692         }
1693
1694         /**
1695          * Transforms activity objects into an XML string
1696          *
1697          * @param object $xpath    XPath object
1698          * @param object $activity Activity object
1699          * @param string $element  element name
1700          *
1701          * @return string XML string
1702          * @todo Find good type-hints for all parameter
1703          */
1704         private static function transformActivity($xpath, $activity, $element)
1705         {
1706                 if (!is_object($activity)) {
1707                         return "";
1708                 }
1709
1710                 $obj_doc = new DOMDocument("1.0", "utf-8");
1711                 $obj_doc->formatOutput = true;
1712
1713                 $obj_element = $obj_doc->createElementNS( ActivityNamespace::ATOM1, $element);
1714
1715                 $activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
1716                 XML::addElement($obj_doc, $obj_element, "type", $activity_type);
1717
1718                 $id = $xpath->query("atom:id", $activity)->item(0);
1719                 if (is_object($id)) {
1720                         $obj_element->appendChild($obj_doc->importNode($id, true));
1721                 }
1722
1723                 $title = $xpath->query("atom:title", $activity)->item(0);
1724                 if (is_object($title)) {
1725                         $obj_element->appendChild($obj_doc->importNode($title, true));
1726                 }
1727
1728                 $links = $xpath->query("atom:link", $activity);
1729                 if (is_object($links)) {
1730                         foreach ($links as $link) {
1731                                 $obj_element->appendChild($obj_doc->importNode($link, true));
1732                         }
1733                 }
1734
1735                 $content = $xpath->query("atom:content", $activity)->item(0);
1736                 if (is_object($content)) {
1737                         $obj_element->appendChild($obj_doc->importNode($content, true));
1738                 }
1739
1740                 $obj_doc->appendChild($obj_element);
1741
1742                 $objxml = $obj_doc->saveXML($obj_element);
1743
1744                 /// @todo This isn't totally clean. We should find a way to transform the namespaces
1745                 $objxml = str_replace("<".$element.' xmlns="http://www.w3.org/2005/Atom">', "<".$element.">", $objxml);
1746                 return($objxml);
1747         }
1748
1749         /**
1750          * Processes the mail elements
1751          *
1752          * @param object $xpath    XPath object
1753          * @param object $mail     mail elements
1754          * @param array  $importer Record of the importer user mixed with contact of the content
1755          * @return void
1756          * @throws \Exception
1757          * @todo  Find good type-hints for all parameter
1758          */
1759         private static function processMail($xpath, $mail, $importer)
1760         {
1761                 Logger::log("Processing mails");
1762
1763                 $msg = [];
1764                 $msg["uid"] = $importer["importer_uid"];
1765                 $msg["from-name"] = $xpath->query("dfrn:sender/dfrn:name/text()", $mail)->item(0)->nodeValue;
1766                 $msg["from-url"] = $xpath->query("dfrn:sender/dfrn:uri/text()", $mail)->item(0)->nodeValue;
1767                 $msg["from-photo"] = $xpath->query("dfrn:sender/dfrn:avatar/text()", $mail)->item(0)->nodeValue;
1768                 $msg["contact-id"] = $importer["id"];
1769                 $msg["uri"] = $xpath->query("dfrn:id/text()", $mail)->item(0)->nodeValue;
1770                 $msg["parent-uri"] = $xpath->query("dfrn:in-reply-to/text()", $mail)->item(0)->nodeValue;
1771                 $msg["created"] = DateTimeFormat::utc($xpath->query("dfrn:sentdate/text()", $mail)->item(0)->nodeValue);
1772                 $msg["title"] = $xpath->query("dfrn:subject/text()", $mail)->item(0)->nodeValue;
1773                 $msg["body"] = $xpath->query("dfrn:content/text()", $mail)->item(0)->nodeValue;
1774
1775                 Mail::insert($msg);
1776         }
1777
1778         /**
1779          * Processes the suggestion elements
1780          *
1781          * @param object $xpath      XPath object
1782          * @param object $suggestion suggestion elements
1783          * @param array  $importer   Record of the importer user mixed with contact of the content
1784          * @return boolean
1785          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1786          * @todo  Find good type-hints for all parameter
1787          */
1788         private static function processSuggestion($xpath, $suggestion, $importer)
1789         {
1790                 Logger::log('Processing suggestions');
1791
1792                 /// @TODO Rewrite this to one statement
1793                 $suggest = [];
1794                 $suggest['uid'] = $importer['importer_uid'];
1795                 $suggest['cid'] = $importer['id'];
1796                 $suggest['url'] = $xpath->query('dfrn:url/text()', $suggestion)->item(0)->nodeValue;
1797                 $suggest['name'] = $xpath->query('dfrn:name/text()', $suggestion)->item(0)->nodeValue;
1798                 $suggest['photo'] = $xpath->query('dfrn:photo/text()', $suggestion)->item(0)->nodeValue;
1799                 $suggest['request'] = $xpath->query('dfrn:request/text()', $suggestion)->item(0)->nodeValue;
1800                 $suggest['body'] = $xpath->query('dfrn:note/text()', $suggestion)->item(0)->nodeValue;
1801
1802                 // Does our member already have a friend matching this description?
1803
1804                 /*
1805                  * The valid result means the friend we're about to send a friend
1806                  * suggestion already has them in their contact, which means no further
1807                  * action is required.
1808                  *
1809                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1810                  */
1811                 $condition = ['nurl' => Strings::normaliseLink($suggest['url']), 'uid' => $suggest['uid']];
1812                 if (DBA::exists('contact', $condition)) {
1813                         return false;
1814                 }
1815                 // Do we already have an fcontact record for this person?
1816
1817                 $fid = 0;
1818                 $fcontact = DBA::selectFirst('fcontact', ['id'], ['url' => $suggest['url']]);
1819                 if (DBA::isResult($fcontact)) {
1820                         $fid = $fcontact['id'];
1821
1822                         // OK, we do. Do we already have an introduction for this person?
1823                         if (DBA::exists('intro', ['uid' => $suggest['uid'], 'fid' => $fid])) {
1824                                 /*
1825                                  * The valid result means the friend we're about to send a friend
1826                                  * suggestion already has them in their contact, which means no further
1827                                  * action is required.
1828                                  *
1829                                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1830                                  */
1831                                 return false;
1832                         }
1833                 }
1834
1835                 if (!$fid) {
1836                         $fields = ['name' => $suggest['name'], 'url' => $suggest['url'],
1837                                 'photo' => $suggest['photo'], 'request' => $suggest['request']];
1838                         DBA::insert('fcontact', $fields);
1839                         $fid = DBA::lastInsertId();
1840                 }
1841
1842                 /*
1843                  * If no record in fcontact is found, below INSERT statement will not
1844                  * link an introduction to it.
1845                  */
1846                 if (empty($fid)) {
1847                         // Database record did not get created. Quietly give up.
1848                         exit();
1849                 }
1850
1851                 $hash = Strings::getRandomHex();
1852
1853                 $fields = ['uid' => $suggest['uid'], 'fid' => $fid, 'contact-id' => $suggest['cid'],
1854                         'note' => $suggest['body'], 'hash' => $hash, 'datetime' => DateTimeFormat::utcNow(), 'blocked' => false];
1855                 DBA::insert('intro', $fields);
1856
1857                 notification(
1858                         [
1859                                 'type'         => Type::SUGGEST,
1860                                 'notify_flags' => $importer['notify-flags'],
1861                                 'language'     => $importer['language'],
1862                                 'to_name'      => $importer['username'],
1863                                 'to_email'     => $importer['email'],
1864                                 'uid'          => $importer['importer_uid'],
1865                                 'item'         => $suggest,
1866                                 'link'         => DI::baseUrl().'/notifications/intros',
1867                                 'source_name'  => $importer['name'],
1868                                 'source_link'  => $importer['url'],
1869                                 'source_photo' => $importer['photo'],
1870                                 'verb'         => Activity::REQ_FRIEND,
1871                                 'otype'        => 'intro']
1872                 );
1873
1874                 return true;
1875         }
1876
1877         /**
1878          * Processes the relocation elements
1879          *
1880          * @param object $xpath      XPath object
1881          * @param object $relocation relocation elements
1882          * @param array  $importer   Record of the importer user mixed with contact of the content
1883          * @return boolean
1884          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1885          * @throws \ImagickException
1886          * @todo  Find good type-hints for all parameter
1887          */
1888         private static function processRelocation($xpath, $relocation, $importer)
1889         {
1890                 Logger::log("Processing relocations");
1891
1892                 /// @TODO Rewrite this to one statement
1893                 $relocate = [];
1894                 $relocate["uid"] = $importer["importer_uid"];
1895                 $relocate["cid"] = $importer["id"];
1896                 $relocate["url"] = $xpath->query("dfrn:url/text()", $relocation)->item(0)->nodeValue;
1897                 $relocate["addr"] = $xpath->query("dfrn:addr/text()", $relocation)->item(0)->nodeValue;
1898                 $relocate["name"] = $xpath->query("dfrn:name/text()", $relocation)->item(0)->nodeValue;
1899                 $relocate["avatar"] = $xpath->query("dfrn:avatar/text()", $relocation)->item(0)->nodeValue;
1900                 $relocate["photo"] = $xpath->query("dfrn:photo/text()", $relocation)->item(0)->nodeValue;
1901                 $relocate["thumb"] = $xpath->query("dfrn:thumb/text()", $relocation)->item(0)->nodeValue;
1902                 $relocate["micro"] = $xpath->query("dfrn:micro/text()", $relocation)->item(0)->nodeValue;
1903                 $relocate["request"] = $xpath->query("dfrn:request/text()", $relocation)->item(0)->nodeValue;
1904                 $relocate["confirm"] = $xpath->query("dfrn:confirm/text()", $relocation)->item(0)->nodeValue;
1905                 $relocate["notify"] = $xpath->query("dfrn:notify/text()", $relocation)->item(0)->nodeValue;
1906                 $relocate["poll"] = $xpath->query("dfrn:poll/text()", $relocation)->item(0)->nodeValue;
1907                 $relocate["sitepubkey"] = $xpath->query("dfrn:sitepubkey/text()", $relocation)->item(0)->nodeValue;
1908
1909                 if (($relocate["avatar"] == "") && ($relocate["photo"] != "")) {
1910                         $relocate["avatar"] = $relocate["photo"];
1911                 }
1912
1913                 if ($relocate["addr"] == "") {
1914                         $relocate["addr"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$3@$2", $relocate["url"]);
1915                 }
1916
1917                 // update contact
1918                 $r = q(
1919                         "SELECT `photo`, `url` FROM `contact` WHERE `id` = %d AND `uid` = %d",
1920                         intval($importer["id"]),
1921                         intval($importer["importer_uid"])
1922                 );
1923
1924                 if (!DBA::isResult($r)) {
1925                         Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
1926                         return false;
1927                 }
1928
1929                 $old = $r[0];
1930
1931                 // Update the contact table. We try to find every entry.
1932                 $fields = ['name' => $relocate["name"], 'avatar' => $relocate["avatar"],
1933                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1934                         'addr' => $relocate["addr"], 'request' => $relocate["request"],
1935                         'confirm' => $relocate["confirm"], 'notify' => $relocate["notify"],
1936                         'poll' => $relocate["poll"], 'site-pubkey' => $relocate["sitepubkey"]];
1937                 $condition = ["(`id` = ?) OR (`nurl` = ?)", $importer["id"], Strings::normaliseLink($old["url"])];
1938
1939                 DBA::update('contact', $fields, $condition);
1940
1941                 Contact::updateAvatar($importer["id"], $relocate["avatar"], true);
1942
1943                 Logger::log('Contacts are updated.');
1944
1945                 /// @TODO
1946                 /// merge with current record, current contents have priority
1947                 /// update record, set url-updated
1948                 /// update profile photos
1949                 /// schedule a scan?
1950                 return true;
1951         }
1952
1953         /**
1954          * Updates an item
1955          *
1956          * @param array $current   the current item record
1957          * @param array $item      the new item record
1958          * @param array $importer  Record of the importer user mixed with contact of the content
1959          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
1960          * @return mixed
1961          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1962          * @todo  set proper type-hints (array?)
1963          */
1964         private static function updateContent($current, $item, $importer, $entrytype)
1965         {
1966                 $changed = false;
1967
1968                 if (self::isEditedTimestampNewer($current, $item)) {
1969                         // do not accept (ignore) an earlier edit than one we currently have.
1970                         if (DateTimeFormat::utc($item["edited"]) < $current["edited"]) {
1971                                 return false;
1972                         }
1973
1974                         $fields = ['title' => $item['title'] ?? '', 'body' => $item['body'] ?? '',
1975                                         'changed' => DateTimeFormat::utcNow(),
1976                                         'edited' => DateTimeFormat::utc($item["edited"])];
1977
1978                         $condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
1979                         Item::update($fields, $condition);
1980
1981                         $changed = true;
1982                 }
1983                 return $changed;
1984         }
1985
1986         /**
1987          * Detects the entry type of the item
1988          *
1989          * @param array $importer Record of the importer user mixed with contact of the content
1990          * @param array $item     the new item record
1991          *
1992          * @return int Is it a toplevel entry, a comment or a relayed comment?
1993          * @throws \Exception
1994          * @todo  set proper type-hints (array?)
1995          */
1996         private static function getEntryType($importer, $item)
1997         {
1998                 if ($item["parent-uri"] != $item["uri"]) {
1999                         $community = false;
2000
2001                         if ($importer["page-flags"] == User::PAGE_FLAGS_COMMUNITY || $importer["page-flags"] == User::PAGE_FLAGS_PRVGROUP) {
2002                                 $sql_extra = "";
2003                                 $community = true;
2004                                 Logger::log("possible community action");
2005                         } else {
2006                                 $sql_extra = " AND `contact`.`self` AND `item`.`wall` ";
2007                         }
2008
2009                         // was the top-level post for this action written by somebody on this site?
2010                         // Specifically, the recipient?
2011
2012                         $is_a_remote_action = false;
2013
2014                         $parent = Item::selectFirst(['parent-uri'], ['uri' => $item["parent-uri"]]);
2015                         if (DBA::isResult($parent)) {
2016                                 $r = q(
2017                                         "SELECT `item`.`forum_mode`, `item`.`wall` FROM `item`
2018                                         INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2019                                         WHERE `item`.`uri` = '%s' AND (`item`.`parent-uri` = '%s' OR `item`.`thr-parent` = '%s')
2020                                         AND `item`.`uid` = %d
2021                                         $sql_extra
2022                                         LIMIT 1",
2023                                         DBA::escape($parent["parent-uri"]),
2024                                         DBA::escape($parent["parent-uri"]),
2025                                         DBA::escape($parent["parent-uri"]),
2026                                         intval($importer["importer_uid"])
2027                                 );
2028                                 if (DBA::isResult($r)) {
2029                                         $is_a_remote_action = true;
2030                                 }
2031                         }
2032
2033                         /*
2034                          * Does this have the characteristics of a community or private group action?
2035                          * If it's an action to a wall post on a community/prvgroup page it's a
2036                          * valid community action. Also forum_mode makes it valid for sure.
2037                          * If neither, it's not.
2038                          */
2039                         if ($is_a_remote_action && $community && (!$r[0]["forum_mode"]) && (!$r[0]["wall"])) {
2040                                 $is_a_remote_action = false;
2041                                 Logger::log("not a community action");
2042                         }
2043
2044                         if ($is_a_remote_action) {
2045                                 return DFRN::REPLY_RC;
2046                         } else {
2047                                 return DFRN::REPLY;
2048                         }
2049                 } else {
2050                         return DFRN::TOP_LEVEL;
2051                 }
2052         }
2053
2054         /**
2055          * Send a "poke"
2056          *
2057          * @param array $item      The new item record
2058          * @param array $importer  Record of the importer user mixed with contact of the content
2059          * @return void
2060          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2061          * @todo  set proper type-hints (array?)
2062          */
2063         private static function doPoke(array $item, array $importer)
2064         {
2065                 $verb = urldecode(substr($item["verb"], strpos($item["verb"], "#")+1));
2066                 if (!$verb) {
2067                         return;
2068                 }
2069                 $xo = XML::parseString($item["object"]);
2070
2071                 if (($xo->type == Activity\ObjectType::PERSON) && ($xo->id)) {
2072                         // somebody was poked/prodded. Was it me?
2073                         $Blink = '';
2074                         foreach ($xo->link as $l) {
2075                                 $atts = $l->attributes();
2076                                 switch ($atts["rel"]) {
2077                                         case "alternate":
2078                                                 $Blink = $atts["href"];
2079                                                 break;
2080                                         default:
2081                                                 break;
2082                                 }
2083                         }
2084
2085                         if ($Blink && Strings::compareLink($Blink, DI::baseUrl() . "/profile/" . $importer["nickname"])) {
2086                                 $author = DBA::selectFirst('contact', ['name', 'thumb', 'url'], ['id' => $item['author-id']]);
2087
2088                                 $parent = Item::selectFirst(['id'], ['uri' => $item['parent-uri'], 'uid' => $importer["importer_uid"]]);
2089                                 $item['parent'] = $parent['id'];
2090
2091                                 // send a notification
2092                                 notification(
2093                                         [
2094                                         "type"         => Type::POKE,
2095                                         "notify_flags" => $importer["notify-flags"],
2096                                         "language"     => $importer["language"],
2097                                         "to_name"      => $importer["username"],
2098                                         "to_email"     => $importer["email"],
2099                                         "uid"          => $importer["importer_uid"],
2100                                         "item"         => $item,
2101                                         "link"         => DI::baseUrl()."/display/".urlencode($item['guid']),
2102                                         "source_name"  => $author["name"],
2103                                         "source_link"  => $author["url"],
2104                                         "source_photo" => $author["thumb"],
2105                                         "verb"         => $item["verb"],
2106                                         "otype"        => "person",
2107                                         "activity"     => $verb,
2108                                         "parent"       => $item['parent']]
2109                                 );
2110                         }
2111                 }
2112         }
2113
2114         /**
2115          * Processes several actions, depending on the verb
2116          *
2117          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2118          * @param array $importer  Record of the importer user mixed with contact of the content
2119          * @param array $item      the new item record
2120          * @param bool  $is_like   Is the verb a "like"?
2121          *
2122          * @return bool Should the processing of the entries be continued?
2123          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2124          * @todo  set proper type-hints (array?)
2125          */
2126         private static function processVerbs($entrytype, $importer, &$item, &$is_like)
2127         {
2128                 Logger::log("Process verb ".$item["verb"]." and object-type ".$item["object-type"]." for entrytype ".$entrytype, Logger::DEBUG);
2129
2130                 if (($entrytype == DFRN::TOP_LEVEL) && !empty($importer['id'])) {
2131                         // The filling of the the "contact" variable is done for legcy reasons
2132                         // The functions below are partly used by ostatus.php as well - where we have this variable
2133                         $contact = Contact::selectFirst([], ['id' => $importer['id']]);
2134
2135                         $activity = DI::activity();
2136
2137                         // Big question: Do we need these functions? They were part of the "consume_feed" function.
2138                         // This function once was responsible for DFRN and OStatus.
2139                         if ($activity->match($item["verb"], Activity::FOLLOW)) {
2140                                 Logger::log("New follower");
2141                                 Contact::addRelationship($importer, $contact, $item);
2142                                 return false;
2143                         }
2144                         if ($activity->match($item["verb"], Activity::UNFOLLOW)) {
2145                                 Logger::log("Lost follower");
2146                                 Contact::removeFollower($importer, $contact, $item);
2147                                 return false;
2148                         }
2149                         if ($activity->match($item["verb"], Activity::REQ_FRIEND)) {
2150                                 Logger::log("New friend request");
2151                                 Contact::addRelationship($importer, $contact, $item, true);
2152                                 return false;
2153                         }
2154                         if ($activity->match($item["verb"], Activity::UNFRIEND)) {
2155                                 Logger::log("Lost sharer");
2156                                 Contact::removeSharer($importer, $contact, $item);
2157                                 return false;
2158                         }
2159                 } else {
2160                         if (($item["verb"] == Activity::LIKE)
2161                                 || ($item["verb"] == Activity::DISLIKE)
2162                                 || ($item["verb"] == Activity::ATTEND)
2163                                 || ($item["verb"] == Activity::ATTENDNO)
2164                                 || ($item["verb"] == Activity::ATTENDMAYBE)
2165                         ) {
2166                                 $is_like = true;
2167                                 $item["gravity"] = GRAVITY_ACTIVITY;
2168                                 // only one like or dislike per person
2169                                 // splitted into two queries for performance issues
2170                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2171                                         'verb' => $item["verb"], 'parent-uri' => $item["parent-uri"]];
2172                                 if (Item::exists($condition)) {
2173                                         return false;
2174                                 }
2175
2176                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2177                                         'verb' => $item["verb"], 'thr-parent' => $item["parent-uri"]];
2178                                 if (Item::exists($condition)) {
2179                                         return false;
2180                                 }
2181
2182                                 // The owner of an activity must be the author
2183                                 $item["owner-name"] = $item["author-name"];
2184                                 $item["owner-link"] = $item["author-link"];
2185                                 $item["owner-avatar"] = $item["author-avatar"];
2186                                 $item["owner-id"] = $item["author-id"];
2187                         } else {
2188                                 $is_like = false;
2189                         }
2190
2191                         if (($item["verb"] == Activity::TAG) && ($item["object-type"] == Activity\ObjectType::TAGTERM)) {
2192                                 $xo = XML::parseString($item["object"]);
2193                                 $xt = XML::parseString($item["target"]);
2194
2195                                 if ($xt->type == Activity\ObjectType::NOTE) {
2196                                         $item_tag = Item::selectFirst(['id', 'uri-id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
2197
2198                                         if (!DBA::isResult($item_tag)) {
2199                                                 Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2200                                                 return false;
2201                                         }
2202
2203                                         // extract tag, if not duplicate, add to parent item
2204                                         if ($xo->content) {
2205                                                 Tag::store($item_tag['uri-id'], Tag::HASHTAG, $xo->content);
2206                                         }
2207                                 }
2208                         }
2209                 }
2210                 return true;
2211         }
2212
2213         /**
2214          * Processes the link elements
2215          *
2216          * @param object $links link elements
2217          * @param array  $item  the item record
2218          * @return void
2219          * @todo set proper type-hints
2220          */
2221         private static function parseLinks($links, &$item)
2222         {
2223                 $rel = "";
2224                 $href = "";
2225                 $type = "";
2226                 $length = "0";
2227                 $title = "";
2228                 foreach ($links as $link) {
2229                         foreach ($link->attributes as $attributes) {
2230                                 switch ($attributes->name) {
2231                                         case "href"  : $href   = $attributes->textContent; break;
2232                                         case "rel"   : $rel    = $attributes->textContent; break;
2233                                         case "type"  : $type   = $attributes->textContent; break;
2234                                         case "length": $length = $attributes->textContent; break;
2235                                         case "title" : $title  = $attributes->textContent; break;
2236                                 }
2237                         }
2238                         if (($rel != "") && ($href != "")) {
2239                                 switch ($rel) {
2240                                         case "alternate":
2241                                                 $item["plink"] = $href;
2242                                                 break;
2243                                         case "enclosure":
2244                                                 if (!empty($item["attach"])) {
2245                                                         $item["attach"] .= ",";
2246                                                 } else {
2247                                                         $item["attach"] = "";
2248                                                 }
2249
2250                                                 $item["attach"] .= '[attach]href="' . $href . '" length="' . $length . '" type="' . $type . '" title="' . $title . '"[/attach]';
2251                                                 break;
2252                                 }
2253                         }
2254                 }
2255         }
2256
2257         /**
2258          * Processes the entry elements which contain the items and comments
2259          *
2260          * @param array  $header   Array of the header elements that always stay the same
2261          * @param object $xpath    XPath object
2262          * @param object $entry    entry elements
2263          * @param array  $importer Record of the importer user mixed with contact of the content
2264          * @param string $xml      xml
2265          * @return void
2266          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2267          * @throws \ImagickException
2268          * @todo  Add type-hints
2269          */
2270         private static function processEntry($header, $xpath, $entry, $importer, $xml)
2271         {
2272                 Logger::log("Processing entries");
2273
2274                 $item = $header;
2275
2276                 $item["protocol"] = Conversation::PARCEL_DFRN;
2277
2278                 $item["source"] = $xml;
2279
2280                 // Get the uri
2281                 $item["uri"] = XML::getFirstNodeValue($xpath, "atom:id/text()", $entry);
2282
2283                 $item["edited"] = XML::getFirstNodeValue($xpath, "atom:updated/text()", $entry);
2284
2285                 $current = Item::selectFirst(['id', 'uid', 'edited', 'body'],
2286                         ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]]
2287                 );
2288                 // Is there an existing item?
2289                 if (DBA::isResult($current) && !self::isEditedTimestampNewer($current, $item)) {
2290                         Logger::log("Item ".$item["uri"]." (".$item['edited'].") already existed.", Logger::DEBUG);
2291                         return;
2292                 }
2293
2294                 // Fetch the owner
2295                 $owner = self::fetchauthor($xpath, $entry, $importer, "dfrn:owner", true, $xml);
2296
2297                 $owner_unknown = (isset($owner["contact-unknown"]) && $owner["contact-unknown"]);
2298
2299                 $item["owner-name"] = $owner["name"];
2300                 $item["owner-link"] = $owner["link"];
2301                 $item["owner-avatar"] = $owner["avatar"];
2302                 $item["owner-id"] = Contact::getIdForURL($owner["link"], 0);
2303
2304                 // fetch the author
2305                 $author = self::fetchauthor($xpath, $entry, $importer, "atom:author", true, $xml);
2306
2307                 $item["author-name"] = $author["name"];
2308                 $item["author-link"] = $author["link"];
2309                 $item["author-avatar"] = $author["avatar"];
2310                 $item["author-id"] = Contact::getIdForURL($author["link"], 0);
2311
2312                 $item["title"] = XML::getFirstNodeValue($xpath, "atom:title/text()", $entry);
2313
2314                 $item["created"] = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2315
2316                 $item["body"] = XML::getFirstNodeValue($xpath, "dfrn:env/text()", $entry);
2317                 $item["body"] = str_replace([' ',"\t","\r","\n"], ['','','',''], $item["body"]);
2318
2319                 $item["body"] = Strings::base64UrlDecode($item["body"]);
2320
2321                 $item["body"] = BBCode::limitBodySize($item["body"]);
2322
2323                 /// @todo We should check for a repeated post and if we know the repeated author.
2324
2325                 // We don't need the content element since "dfrn:env" is always present
2326                 //$item["body"] = $xpath->query("atom:content/text()", $entry)->item(0)->nodeValue;
2327
2328                 $item["location"] = XML::getFirstNodeValue($xpath, "dfrn:location/text()", $entry);
2329
2330                 $item["coord"] = XML::getFirstNodeValue($xpath, "georss:point", $entry);
2331
2332                 $item["private"] = XML::getFirstNodeValue($xpath, "dfrn:private/text()", $entry);
2333
2334                 $unlisted = XML::getFirstNodeValue($xpath, "dfrn:unlisted/text()", $entry);
2335                 if (!empty($unlisted) && ($item['private'] != Item::PRIVATE)) {
2336                         $item['private'] = Item::UNLISTED;
2337                 }
2338
2339                 $item["extid"] = XML::getFirstNodeValue($xpath, "dfrn:extid/text()", $entry);
2340
2341                 if (XML::getFirstNodeValue($xpath, "dfrn:bookmark/text()", $entry) == "true") {
2342                         $item["post-type"] = Item::PT_PAGE;
2343                 }
2344
2345                 $notice_info = $xpath->query("statusnet:notice_info", $entry);
2346                 if ($notice_info && ($notice_info->length > 0)) {
2347                         foreach ($notice_info->item(0)->attributes as $attributes) {
2348                                 if ($attributes->name == "source") {
2349                                         $item["app"] = strip_tags($attributes->textContent);
2350                                 }
2351                         }
2352                 }
2353
2354                 $item["guid"] = XML::getFirstNodeValue($xpath, "dfrn:diaspora_guid/text()", $entry);
2355
2356                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
2357
2358                 Tag::storeFromBody($item['uri-id'], $item["body"]);
2359
2360                 // We store the data from "dfrn:diaspora_signature" in a different table, this is done in "Item::insert"
2361                 $dsprsig = XML::unescape(XML::getFirstNodeValue($xpath, "dfrn:diaspora_signature/text()", $entry));
2362                 if ($dsprsig != "") {
2363                         $signature = json_decode(base64_decode($dsprsig));
2364                         // We don't store the old style signatures anymore that also contained the "signature" and "signer"
2365                         if (!empty($signature->signed_text) && empty($signature->signature) && empty($signature->signer)) {
2366                                 $item["diaspora_signed_text"] = $signature->signed_text;
2367                         }
2368                 }
2369
2370                 $item["verb"] = XML::getFirstNodeValue($xpath, "activity:verb/text()", $entry);
2371
2372                 if (XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry) != "") {
2373                         $item["object-type"] = XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry);
2374                 }
2375
2376                 $object = $xpath->query("activity:object", $entry)->item(0);
2377                 $item["object"] = self::transformActivity($xpath, $object, "object");
2378
2379                 if (trim($item["object"]) != "") {
2380                         $r = XML::parseString($item["object"]);
2381                         if (isset($r->type)) {
2382                                 $item["object-type"] = $r->type;
2383                         }
2384                 }
2385
2386                 $target = $xpath->query("activity:target", $entry)->item(0);
2387                 $item["target"] = self::transformActivity($xpath, $target, "target");
2388
2389                 $categories = $xpath->query("atom:category", $entry);
2390                 if ($categories) {
2391                         foreach ($categories as $category) {
2392                                 $term = "";
2393                                 $scheme = "";
2394                                 foreach ($category->attributes as $attributes) {
2395                                         if ($attributes->name == "term") {
2396                                                 $term = $attributes->textContent;
2397                                         }
2398
2399                                         if ($attributes->name == "scheme") {
2400                                                 $scheme = $attributes->textContent;
2401                                         }
2402                                 }
2403
2404                                 if (($term != "") && ($scheme != "")) {
2405                                         $parts = explode(":", $scheme);
2406                                         if ((count($parts) >= 4) && (array_shift($parts) == "X-DFRN")) {
2407                                                 $termurl = array_pop($parts);
2408                                                 $termurl = array_pop($parts) . $termurl;
2409                                                 Tag::store($item['uri-id'], Tag::IMPLICIT_MENTION, $term, $termurl);
2410                                         }
2411                                 }
2412                         }
2413                 }
2414
2415                 $links = $xpath->query("atom:link", $entry);
2416                 if ($links) {
2417                         self::parseLinks($links, $item);
2418                 }
2419
2420                 $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
2421
2422                 $conv = $xpath->query('ostatus:conversation', $entry);
2423                 if (is_object($conv->item(0))) {
2424                         foreach ($conv->item(0)->attributes as $attributes) {
2425                                 if ($attributes->name == "ref") {
2426                                         $item['conversation-uri'] = $attributes->textContent;
2427                                 }
2428                                 if ($attributes->name == "href") {
2429                                         $item['conversation-href'] = $attributes->textContent;
2430                                 }
2431                         }
2432                 }
2433
2434                 // Is it a reply or a top level posting?
2435                 $item["parent-uri"] = $item["uri"];
2436
2437                 $inreplyto = $xpath->query("thr:in-reply-to", $entry);
2438                 if (is_object($inreplyto->item(0))) {
2439                         foreach ($inreplyto->item(0)->attributes as $attributes) {
2440                                 if ($attributes->name == "ref") {
2441                                         $item["parent-uri"] = $attributes->textContent;
2442                                 }
2443                         }
2444                 }
2445
2446                 // Get the type of the item (Top level post, reply or remote reply)
2447                 $entrytype = self::getEntryType($importer, $item);
2448
2449                 // Now assign the rest of the values that depend on the type of the message
2450                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2451                         if (!isset($item["object-type"])) {
2452                                 $item["object-type"] = Activity\ObjectType::COMMENT;
2453                         }
2454
2455                         if ($item["contact-id"] != $owner["contact-id"]) {
2456                                 $item["contact-id"] = $owner["contact-id"];
2457                         }
2458
2459                         if (($item["network"] != $owner["network"]) && ($owner["network"] != "")) {
2460                                 $item["network"] = $owner["network"];
2461                         }
2462
2463                         if ($item["contact-id"] != $author["contact-id"]) {
2464                                 $item["contact-id"] = $author["contact-id"];
2465                         }
2466
2467                         if (($item["network"] != $author["network"]) && ($author["network"] != "")) {
2468                                 $item["network"] = $author["network"];
2469                         }
2470                 }
2471
2472                 // Ensure to have the correct share data
2473                 $item = Item::addShareDataFromOriginal($item);
2474
2475                 if ($entrytype == DFRN::REPLY_RC) {
2476                         $item["wall"] = 1;
2477                 } elseif ($entrytype == DFRN::TOP_LEVEL) {
2478                         if (!isset($item["object-type"])) {
2479                                 $item["object-type"] = Activity\ObjectType::NOTE;
2480                         }
2481
2482                         // Is it an event?
2483                         if (($item["object-type"] == Activity\ObjectType::EVENT) && !$owner_unknown) {
2484                                 Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
2485                                 $ev = Event::fromBBCode($item["body"]);
2486                                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
2487                                         Logger::log("Event in item ".$item["uri"]." was found.", Logger::DEBUG);
2488                                         $ev["cid"]     = $importer["id"];
2489                                         $ev["uid"]     = $importer["importer_uid"];
2490                                         $ev["uri"]     = $item["uri"];
2491                                         $ev["edited"]  = $item["edited"];
2492                                         $ev["private"] = $item["private"];
2493                                         $ev["guid"]    = $item["guid"];
2494                                         $ev["plink"]   = $item["plink"];
2495
2496                                         $condition = ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]];
2497                                         $event = DBA::selectFirst('event', ['id'], $condition);
2498                                         if (DBA::isResult($event)) {
2499                                                 $ev["id"] = $event["id"];
2500                                         }
2501
2502                                         $event_id = Event::store($ev);
2503                                         Logger::log("Event ".$event_id." was stored", Logger::DEBUG);
2504                                         return;
2505                                 }
2506                         }
2507                 }
2508
2509                 if (!self::processVerbs($entrytype, $importer, $item, $is_like)) {
2510                         Logger::log("Exiting because 'processVerbs' told us so", Logger::DEBUG);
2511                         return;
2512                 }
2513
2514                 // This check is done here to be able to receive connection requests in "processVerbs"
2515                 if (($entrytype == DFRN::TOP_LEVEL) && $owner_unknown) {
2516                         Logger::log("Item won't be stored because user " . $importer["importer_uid"] . " doesn't follow " . $item["owner-link"] . ".", Logger::DEBUG);
2517                         return;
2518                 }
2519
2520
2521                 // Update content if 'updated' changes
2522                 if (DBA::isResult($current)) {
2523                         if (self::updateContent($current, $item, $importer, $entrytype)) {
2524                                 Logger::log("Item ".$item["uri"]." was updated.", Logger::DEBUG);
2525                         } else {
2526                                 Logger::log("Item " . $item["uri"] . " already existed.", Logger::DEBUG);
2527                         }
2528                         return;
2529                 }
2530
2531                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2532                         $posted_id = Item::insert($item);
2533                         if ($posted_id) {
2534                                 Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
2535
2536                                 if ($item['uid'] == 0) {
2537                                         Item::distribute($posted_id);
2538                                 }
2539
2540                                 return true;
2541                         }
2542                 } else { // $entrytype == DFRN::TOP_LEVEL
2543                         if (($importer["uid"] == 0) && ($importer["importer_uid"] != 0)) {
2544                                 Logger::log("Contact ".$importer["id"]." isn't known to user ".$importer["importer_uid"].". The post will be ignored.", Logger::DEBUG);
2545                                 return;
2546                         }
2547                         if (!Strings::compareLink($item["owner-link"], $importer["url"])) {
2548                                 /*
2549                                  * The item owner info is not our contact. It's OK and is to be expected if this is a tgroup delivery,
2550                                  * but otherwise there's a possible data mixup on the sender's system.
2551                                  * the tgroup delivery code called from Item::insert will correct it if it's a forum,
2552                                  * but we're going to unconditionally correct it here so that the post will always be owned by our contact.
2553                                  */
2554                                 Logger::log('Correcting item owner.', Logger::DEBUG);
2555                                 $item["owner-link"] = $importer["url"];
2556                                 $item["owner-id"] = Contact::getIdForURL($importer["url"], 0);
2557                         }
2558
2559                         if (($importer["rel"] == Contact::FOLLOWER) && (!self::tgroupCheck($importer["importer_uid"], $item))) {
2560                                 Logger::log("Contact ".$importer["id"]." is only follower and tgroup check was negative.", Logger::DEBUG);
2561                                 return;
2562                         }
2563
2564                         // This is my contact on another system, but it's really me.
2565                         // Turn this into a wall post.
2566                         $notify = Item::isRemoteSelf($importer, $item);
2567
2568                         $posted_id = Item::insert($item, $notify);
2569
2570                         if ($notify) {
2571                                 $posted_id = $notify;
2572                         }
2573
2574                         Logger::log("Item was stored with id ".$posted_id, Logger::DEBUG);
2575
2576                         if ($item['uid'] == 0) {
2577                                 Item::distribute($posted_id);
2578                         }
2579
2580                         if (stristr($item["verb"], Activity::POKE)) {
2581                                 $item['id'] = $posted_id;
2582                                 self::doPoke($item, $importer);
2583                         }
2584                 }
2585         }
2586
2587         /**
2588          * Deletes items
2589          *
2590          * @param object $xpath    XPath object
2591          * @param object $deletion deletion elements
2592          * @param array  $importer Record of the importer user mixed with contact of the content
2593          * @return void
2594          * @throws \Exception
2595          * @todo  set proper type-hints
2596          */
2597         private static function processDeletion($xpath, $deletion, $importer)
2598         {
2599                 Logger::log("Processing deletions");
2600                 $uri = null;
2601
2602                 foreach ($deletion->attributes as $attributes) {
2603                         if ($attributes->name == "ref") {
2604                                 $uri = $attributes->textContent;
2605                         }
2606                 }
2607
2608                 if (!$uri || !$importer["id"]) {
2609                         return false;
2610                 }
2611
2612                 $condition = ['uri' => $uri, 'uid' => $importer["importer_uid"]];
2613                 $item = Item::selectFirst(['id', 'parent', 'contact-id', 'file', 'deleted', 'gravity'], $condition);
2614                 if (!DBA::isResult($item)) {
2615                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " wasn't found.", Logger::DEBUG);
2616                         return;
2617                 }
2618
2619                 if (strstr($item['file'], '[')) {
2620                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " is filed. So it won't be deleted.", Logger::DEBUG);
2621                         return;
2622                 }
2623
2624                 // When it is a starting post it has to belong to the person that wants to delete it
2625                 if (($item['gravity'] == GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2626                         Logger::log("Item with uri " . $uri . " don't belong to contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2627                         return;
2628                 }
2629
2630                 // Comments can be deleted by the thread owner or comment owner
2631                 if (($item['gravity'] != GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2632                         $condition = ['id' => $item['parent'], 'contact-id' => $importer["id"]];
2633                         if (!Item::exists($condition)) {
2634                                 Logger::log("Item with uri " . $uri . " wasn't found or mustn't be deleted by contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2635                                 return;
2636                         }
2637                 }
2638
2639                 if ($item["deleted"]) {
2640                         return;
2641                 }
2642
2643                 Logger::log('deleting item '.$item['id'].' uri='.$uri, Logger::DEBUG);
2644
2645                 Item::markForDeletion(['id' => $item['id']]);
2646         }
2647
2648         /**
2649          * Imports a DFRN message
2650          *
2651          * @param string $xml          The DFRN message
2652          * @param array  $importer     Record of the importer user mixed with contact of the content
2653          * @param bool   $sort_by_date Is used when feeds are polled
2654          * @return integer Import status
2655          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2656          * @throws \ImagickException
2657          * @todo  set proper type-hints
2658          */
2659         public static function import($xml, $importer, $sort_by_date = false)
2660         {
2661                 if ($xml == "") {
2662                         return 400;
2663                 }
2664
2665                 $doc = new DOMDocument();
2666                 @$doc->loadXML($xml);
2667
2668                 $xpath = new DOMXPath($doc);
2669                 $xpath->registerNamespace("atom", ActivityNamespace::ATOM1);
2670                 $xpath->registerNamespace("thr", ActivityNamespace::THREAD);
2671                 $xpath->registerNamespace("at", ActivityNamespace::TOMB);
2672                 $xpath->registerNamespace("media", ActivityNamespace::MEDIA);
2673                 $xpath->registerNamespace("dfrn", ActivityNamespace::DFRN);
2674                 $xpath->registerNamespace("activity", ActivityNamespace::ACTIVITY);
2675                 $xpath->registerNamespace("georss", ActivityNamespace::GEORSS);
2676                 $xpath->registerNamespace("poco", ActivityNamespace::POCO);
2677                 $xpath->registerNamespace("ostatus", ActivityNamespace::OSTATUS);
2678                 $xpath->registerNamespace("statusnet", ActivityNamespace::STATUSNET);
2679
2680                 $header = [];
2681                 $header["uid"] = $importer["importer_uid"];
2682                 $header["network"] = Protocol::DFRN;
2683                 $header["wall"] = 0;
2684                 $header["origin"] = 0;
2685                 $header["contact-id"] = $importer["id"];
2686
2687                 // Update the contact table if the data has changed
2688
2689                 // The "atom:author" is only present in feeds
2690                 if ($xpath->query("/atom:feed/atom:author")->length > 0) {
2691                         self::fetchauthor($xpath, $doc->firstChild, $importer, "atom:author", false, $xml);
2692                 }
2693
2694                 // Only the "dfrn:owner" in the head section contains all data
2695                 if ($xpath->query("/atom:feed/dfrn:owner")->length > 0) {
2696                         self::fetchauthor($xpath, $doc->firstChild, $importer, "dfrn:owner", false, $xml);
2697                 }
2698
2699                 Logger::log("Import DFRN message for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2700
2701                 // is it a public forum? Private forums aren't exposed with this method
2702                 $forum = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:community/text()"));
2703
2704                 // The account type is new since 3.5.1
2705                 if ($xpath->query("/atom:feed/dfrn:account_type")->length > 0) {
2706                         // Hint: We are using separate update calls for uid=0 and uid!=0 since a combined call is bad for the database performance
2707
2708                         $accounttype = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:account_type/text()"));
2709
2710                         if ($accounttype != $importer["contact-type"]) {
2711                                 DBA::update('contact', ['contact-type' => $accounttype], ['id' => $importer['id']]);
2712
2713                                 // Updating the public contact as well
2714                                 DBA::update('contact', ['contact-type' => $accounttype], ['uid' => 0, 'nurl' => $importer['nurl']]);
2715                         }
2716                         // A forum contact can either have set "forum" or "prv" - but not both
2717                         if ($accounttype == User::ACCOUNT_TYPE_COMMUNITY) {
2718                                 // It's a forum, so either set the public or private forum flag
2719                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `id` = ?', $forum, !$forum, $importer['id']];
2720                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2721
2722                                 // Updating the public contact as well
2723                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `uid` = 0 AND `nurl` = ?', $forum, !$forum, $importer['nurl']];
2724                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2725                         } else {
2726                                 // It's not a forum, so remove the flags
2727                                 $condition = ['(`forum` OR `prv`) AND `id` = ?', $importer['id']];
2728                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2729
2730                                 // Updating the public contact as well
2731                                 $condition = ['(`forum` OR `prv`) AND `uid` = 0 AND `nurl` = ?', $importer['nurl']];
2732                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2733                         }
2734                 } elseif ($forum != $importer["forum"]) { // Deprecated since 3.5.1
2735                         $condition = ['`forum` != ? AND `id` = ?', $forum, $importer["id"]];
2736                         DBA::update('contact', ['forum' => $forum], $condition);
2737
2738                         // Updating the public contact as well
2739                         $condition = ['`forum` != ? AND `uid` = 0 AND `nurl` = ?', $forum, $importer['nurl']];
2740                         DBA::update('contact', ['forum' => $forum], $condition);
2741                 }
2742
2743
2744                 // We are processing relocations even if we are ignoring a contact
2745                 $relocations = $xpath->query("/atom:feed/dfrn:relocate");
2746                 foreach ($relocations as $relocation) {
2747                         self::processRelocation($xpath, $relocation, $importer);
2748                 }
2749
2750                 if (($importer["uid"] != 0) && !$importer["readonly"]) {
2751                         $mails = $xpath->query("/atom:feed/dfrn:mail");
2752                         foreach ($mails as $mail) {
2753                                 self::processMail($xpath, $mail, $importer);
2754                         }
2755
2756                         $suggestions = $xpath->query("/atom:feed/dfrn:suggest");
2757                         foreach ($suggestions as $suggestion) {
2758                                 self::processSuggestion($xpath, $suggestion, $importer);
2759                         }
2760                 }
2761
2762                 $deletions = $xpath->query("/atom:feed/at:deleted-entry");
2763                 foreach ($deletions as $deletion) {
2764                         self::processDeletion($xpath, $deletion, $importer);
2765                 }
2766
2767                 if (!$sort_by_date) {
2768                         $entries = $xpath->query("/atom:feed/atom:entry");
2769                         foreach ($entries as $entry) {
2770                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2771                         }
2772                 } else {
2773                         $newentries = [];
2774                         $entries = $xpath->query("/atom:feed/atom:entry");
2775                         foreach ($entries as $entry) {
2776                                 $created = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2777                                 $newentries[strtotime($created)] = $entry;
2778                         }
2779
2780                         // Now sort after the publishing date
2781                         ksort($newentries);
2782
2783                         foreach ($newentries as $entry) {
2784                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2785                         }
2786                 }
2787                 Logger::log("Import done for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2788                 return 200;
2789         }
2790
2791         /**
2792          * Returns the activity verb
2793          *
2794          * @param array $item Item array
2795          *
2796          * @return string activity verb
2797          */
2798         private static function constructVerb(array $item)
2799         {
2800                 if ($item['verb']) {
2801                         return $item['verb'];
2802                 }
2803                 return Activity::POST;
2804         }
2805
2806         private static function tgroupCheck($uid, $item)
2807         {
2808                 $mention = false;
2809
2810                 // check that the message originated elsewhere and is a top-level post
2811
2812                 if ($item['wall'] || $item['origin'] || ($item['uri'] != $item['parent-uri'])) {
2813                         return false;
2814                 }
2815
2816                 $user = DBA::selectFirst('user', ['page-flags', 'nickname'], ['uid' => $uid]);
2817                 if (!DBA::isResult($user)) {
2818                         return false;
2819                 }
2820
2821                 $community_page = ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY);
2822                 $prvgroup = ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP);
2823
2824                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
2825
2826                 /*
2827                  * Diaspora uses their own hardwired link URL in @-tags
2828                  * instead of the one we supply with webfinger
2829                  */
2830                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
2831
2832                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2833                 if ($cnt) {
2834                         foreach ($matches as $mtch) {
2835                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2836                                         $mention = true;
2837                                         Logger::log('mention found: ' . $mtch[2]);
2838                                 }
2839                         }
2840                 }
2841
2842                 if (!$mention) {
2843                         return false;
2844                 }
2845
2846                 return $community_page || $prvgroup;
2847         }
2848
2849         /**
2850          * This function returns true if $update has an edited timestamp newer
2851          * than $existing, i.e. $update contains new data which should override
2852          * what's already there.  If there is no timestamp yet, the update is
2853          * assumed to be newer.  If the update has no timestamp, the existing
2854          * item is assumed to be up-to-date.  If the timestamps are equal it
2855          * assumes the update has been seen before and should be ignored.
2856          *
2857          * @param $existing
2858          * @param $update
2859          * @return bool
2860          * @throws \Exception
2861          */
2862         private static function isEditedTimestampNewer($existing, $update)
2863         {
2864                 if (empty($existing['edited'])) {
2865                         return true;
2866                 }
2867                 if (empty($update['edited'])) {
2868                         return false;
2869                 }
2870
2871                 $existing_edited = DateTimeFormat::utc($existing['edited']);
2872                 $update_edited = DateTimeFormat::utc($update['edited']);
2873
2874                 return (strcmp($existing_edited, $update_edited) < 0);
2875         }
2876
2877         /**
2878          * Checks if the given contact url does support DFRN
2879          *
2880          * @param string  $url    profile url
2881          * @param boolean $update Update the profile
2882          * @return boolean
2883          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2884          * @throws \ImagickException
2885          */
2886         public static function isSupportedByContactUrl($url, $update = false)
2887         {
2888                 $probe = Probe::uri($url, Protocol::DFRN, 0, !$update);
2889                 return $probe['network'] == Protocol::DFRN;
2890         }
2891 }