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\Model\Verb;
  47 use Friendica\Network\Probe;
  48 use Friendica\Util\Crypto;
  49 use Friendica\Util\DateTimeFormat;
  50 use Friendica\Util\Images;
  51 use Friendica\Util\Network;
  52 use Friendica\Util\Strings;
  53 use Friendica\Util\XML;
  54
  55 /**
  56  * This class contain functions to create and send DFRN XML files
  57  */
  58 class DFRN
  59 {
  60
  61         const TOP_LEVEL = 0;    // Top level posting
  62         const REPLY = 1;                // Regular reply that is stored locally
  63         const REPLY_RC = 2;     // Reply that will be relayed
  64
  65         /**
  66          * Generates an array of contact and user for DFRN imports
  67          *
  68          * This array contains not only the receiver but also the sender of the message.
  69          *
  70          * @param integer $cid Contact id
  71          * @param integer $uid User id
  72          *
  73          * @return array importer
  74          * @throws \Exception
  75          */
  76         public static function getImporter($cid, $uid = 0)
  77         {
  78                 $condition = ['id' => $cid, 'blocked' => false, 'pending' => false];
  79                 $contact = DBA::selectFirst('contact', [], $condition);
  80                 if (!DBA::isResult($contact)) {
  81                         return [];
  82                 }
  83
  84                 $contact['cpubkey'] = $contact['pubkey'];
  85                 $contact['cprvkey'] = $contact['prvkey'];
  86                 $contact['senderName'] = $contact['name'];
  87
  88                 if ($uid != 0) {
  89                         $condition = ['uid' => $uid, 'account_expired' => false, 'account_removed' => false];
  90                         $user = DBA::selectFirst('user', [], $condition);
  91                         if (!DBA::isResult($user)) {
  92                                 return [];
  93                         }
  94
  95                         $user['importer_uid'] = $user['uid'];
  96                         $user['uprvkey'] = $user['prvkey'];
  97                 } else {
  98                         $user = ['importer_uid' => 0, 'uprvkey' => '', 'timezone' => 'UTC',
  99                                 'nickname' => '', 'sprvkey' => '', 'spubkey' => '',
 100                                 'page-flags' => 0, 'account-type' => 0, 'prvnets' => 0];
 101                 }
 102
 103                 return array_merge($contact, $user);
 104         }
 105
 106         /**
 107          * Generates the atom entries for delivery.php
 108          *
 109          * This function is used whenever content is transmitted via DFRN.
 110          *
 111          * @param array $items Item elements
 112          * @param array $owner Owner record
 113          *
 114          * @return string DFRN entries
 115          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 116          * @throws \ImagickException
 117          * @todo  Find proper type-hints
 118          */
 119         public static function entries($items, $owner)
 120         {
 121                 $doc = new DOMDocument('1.0', 'utf-8');
 122                 $doc->formatOutput = true;
 123
 124                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 125
 126                 if (! count($items)) {
 127                         return trim($doc->saveXML());
 128                 }
 129
 130                 foreach ($items as $item) {
 131                         // These values aren't sent when sending from the queue.
 132                         /// @todo Check if we can set these values from the queue or if they are needed at all.
 133                         $item["entry:comment-allow"] = ($item["entry:comment-allow"] ?? '') ?: true;
 134                         $item["entry:cid"] = $item["entry:cid"] ?? 0;
 135
 136                         $entry = self::entry($doc, "text", $item, $owner, $item["entry:comment-allow"], $item["entry:cid"]);
 137                         if (isset($entry)) {
 138                                 $root->appendChild($entry);
 139                         }
 140                 }
 141
 142                 return trim($doc->saveXML());
 143         }
 144
 145         /**
 146          * Generate an atom feed for the given user
 147          *
 148          * This function is called when another server is pulling data from the user feed.
 149          *
 150          * @param string  $dfrn_id     DFRN ID from the requesting party
 151          * @param string  $owner_nick  Owner nick name
 152          * @param string  $last_update Date of the last update
 153          * @param int     $direction   Can be -1, 0 or 1.
 154          * @param boolean $onlyheader  Output only the header without content? (Default is "no")
 155          *
 156          * @return string DFRN feed entries
 157          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 158          * @throws \ImagickException
 159          */
 160         public static function feed($dfrn_id, $owner_nick, $last_update, $direction = 0, $onlyheader = false)
 161         {
 162                 $a = DI::app();
 163
 164                 $sitefeed    = ((strlen($owner_nick)) ? false : true); // not yet implemented, need to rewrite huge chunks of following logic
 165                 $public_feed = (($dfrn_id) ? false : true);
 166                 $starred     = false;   // not yet implemented, possible security issues
 167                 $converse    = false;
 168
 169                 if ($public_feed && $a->argc > 2) {
 170                         for ($x = 2; $x < $a->argc; $x++) {
 171                                 if ($a->argv[$x] == 'converse') {
 172                                         $converse = true;
 173                                 }
 174                                 if ($a->argv[$x] == 'starred') {
 175                                         $starred = true;
 176                                 }
 177                                 if ($a->argv[$x] == 'category' && $a->argc > ($x + 1) && strlen($a->argv[$x+1])) {
 178                                         $category = $a->argv[$x+1];
 179                                 }
 180                         }
 181                 }
 182
 183                 // default permissions - anonymous user
 184
 185                 $sql_extra = sprintf(" AND `item`.`private` != %s ", Item::PRIVATE);
 186
 187                 $owner = DBA::selectFirst('owner-view', [], ['nickname' => $owner_nick]);
 188                 if (!DBA::isResult($owner)) {
 189                         Logger::log(sprintf('No contact found for nickname=%d', $owner_nick), Logger::WARNING);
 190                         exit();
 191                 }
 192
 193                 $owner_id = $owner['uid'];
 194
 195                 $sql_post_table = "";
 196
 197                 if (! $public_feed) {
 198                         switch ($direction) {
 199                                 case (-1):
 200                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 201                                         break;
 202                                 case 0:
 203                                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 204                                         break;
 205                                 case 1:
 206                                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 207                                         break;
 208                                 default:
 209                                         return false;
 210                                         break; // NOTREACHED
 211                         }
 212
 213                         $r = q(
 214                                 "SELECT * FROM `contact` WHERE NOT `blocked` AND `contact`.`uid` = %d $sql_extra LIMIT 1",
 215                                 intval($owner_id)
 216                         );
 217
 218                         if (! DBA::isResult($r)) {
 219                                 Logger::log(sprintf('No contact found for uid=%d', $owner_id), Logger::WARNING);
 220                                 exit();
 221                         }
 222
 223                         $contact = $r[0];
 224
 225                         $set = PermissionSet::get($owner_id, $contact['id']);
 226
 227                         if (!empty($set)) {
 228                                 $sql_extra = " AND `item`.`psid` IN (" . implode(',', $set) .")";
 229                         } else {
 230                                 $sql_extra = sprintf(" AND `item`.`private` != %s", Item::PRIVATE);
 231                         }
 232                 }
 233
 234                 if ($public_feed) {
 235                         $sort = 'DESC';
 236                 } else {
 237                         $sort = 'ASC';
 238                 }
 239
 240                 if (! strlen($last_update)) {
 241                         $last_update = 'now -30 days';
 242                 }
 243
 244                 if (isset($category)) {
 245                         $sql_post_table = sprintf("INNER JOIN (SELECT `uri-id` FROM `category-view` WHERE `name` = '%s' AND `type` = %d AND `uid` = %d ORDER BY `uri-id` DESC) AS `category` ON `item`.`uri-id` = `category`.`uri-id` ",
 246                                 DBA::escape(Strings::protectSprintf($category)), intval(Category::CATEGORY), intval($owner_id));
 247                 }
 248
 249                 if ($public_feed && ! $converse) {
 250                         $sql_extra .= " AND `contact`.`self` = 1 ";
 251                 }
 252
 253                 $check_date = DateTimeFormat::utc($last_update);
 254
 255                 $r = q(
 256                         "SELECT `item`.`id`
 257                         FROM `item` USE INDEX (`uid_wall_changed`) $sql_post_table
 258                         STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
 259                         WHERE `item`.`uid` = %d AND `item`.`wall` AND `item`.`changed` > '%s'
 260                         AND `vid` != %d AND `item`.`visible` $sql_extra
 261                         ORDER BY `item`.`parent` ".$sort.", `item`.`received` ASC LIMIT 0, 300",
 262                         intval($owner_id),
 263                         DBA::escape($check_date),
 264                         Verb::getID(Activity::ANNOUNCE),
 265                         DBA::escape($sort)
 266                 );
 267
 268                 $ids = [];
 269                 foreach ($r as $item) {
 270                         $ids[] = $item['id'];
 271                 }
 272
 273                 if (!empty($ids)) {
 274                         $ret = Item::select(Item::DELIVER_FIELDLIST, ['id' => $ids]);
 275                         $items = Item::inArray($ret);
 276                 } else {
 277                         $items = [];
 278                 }
 279
 280                 /*
 281                  * Will check further below if this actually returned results.
 282                  * We will provide an empty feed if that is the case.
 283                  */
 284
 285                 $doc = new DOMDocument('1.0', 'utf-8');
 286                 $doc->formatOutput = true;
 287
 288                 $alternatelink = $owner['url'];
 289
 290                 if (isset($category)) {
 291                         $alternatelink .= "/category/".$category;
 292                 }
 293
 294                 if ($public_feed) {
 295                         $author = "dfrn:owner";
 296                 } else {
 297                         $author = "author";
 298                 }
 299
 300                 $root = self::addHeader($doc, $owner, $author, $alternatelink, true);
 301
 302                 /// @TODO This hook can't work anymore
 303                 //      \Friendica\Core\Hook::callAll('atom_feed', $atom);
 304
 305                 if (!DBA::isResult($items) || $onlyheader) {
 306                         $atom = trim($doc->saveXML());
 307
 308                         Hook::callAll('atom_feed_end', $atom);
 309
 310                         return $atom;
 311                 }
 312
 313                 foreach ($items as $item) {
 314                         // prevent private email from leaking.
 315                         if ($item['network'] == Protocol::MAIL) {
 316                                 continue;
 317                         }
 318
 319                         // public feeds get html, our own nodes use bbcode
 320
 321                         if ($public_feed) {
 322                                 $type = 'html';
 323                                 // catch any email that's in a public conversation and make sure it doesn't leak
 324                                 if ($item['private'] == Item::PRIVATE) {
 325                                         continue;
 326                                 }
 327                         } else {
 328                                 $type = 'text';
 329                         }
 330
 331                         $entry = self::entry($doc, $type, $item, $owner, true);
 332                         if (isset($entry)) {
 333                                 $root->appendChild($entry);
 334                         }
 335                 }
 336
 337                 $atom = trim($doc->saveXML());
 338
 339                 Hook::callAll('atom_feed_end', $atom);
 340
 341                 return $atom;
 342         }
 343
 344         /**
 345          * Generate an atom entry for a given item id
 346          *
 347          * @param int     $item_id      The item id
 348          * @param boolean $conversation Show the conversation. If false show the single post.
 349          *
 350          * @return string DFRN feed entry
 351          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 352          * @throws \ImagickException
 353          */
 354         public static function itemFeed($item_id, $conversation = false)
 355         {
 356                 if ($conversation) {
 357                         $condition = ['parent' => $item_id];
 358                 } else {
 359                         $condition = ['id' => $item_id];
 360                 }
 361
 362                 $ret = Item::select(Item::DELIVER_FIELDLIST, $condition);
 363                 $items = Item::inArray($ret);
 364                 if (!DBA::isResult($items)) {
 365                         return '';
 366                 }
 367
 368                 $item = $items[0];
 369
 370                 if ($item['uid'] != 0) {
 371                         $owner = User::getOwnerDataById($item['uid']);
 372                         if (!$owner) {
 373                                 return '';
 374                         }
 375                 } else {
 376                         $owner = ['uid' => 0, 'nick' => 'feed-item'];
 377                 }
 378
 379                 $doc = new DOMDocument('1.0', 'utf-8');
 380                 $doc->formatOutput = true;
 381                 $type = 'html';
 382
 383                 if ($conversation) {
 384                         $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 385                         $doc->appendChild($root);
 386
 387                         $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 388                         $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 389                         $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 390                         $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 391                         $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 392                         $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 393                         $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 394                         $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 395                         $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 396
 397                         //$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 398
 399                         foreach ($items as $item) {
 400                                 $entry = self::entry($doc, $type, $item, $owner, true, 0);
 401                                 if (isset($entry)) {
 402                                         $root->appendChild($entry);
 403                                 }
 404                         }
 405                 } else {
 406                         self::entry($doc, $type, $item, $owner, true, 0, true);
 407                 }
 408
 409                 $atom = trim($doc->saveXML());
 410                 return $atom;
 411         }
 412
 413         /**
 414          * Create XML text for DFRN mails
 415          *
 416          * @param array $item  message elements
 417          * @param array $owner Owner record
 418          *
 419          * @return string DFRN mail
 420          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 421          * @todo  Find proper type-hints
 422          */
 423         public static function mail($item, $owner)
 424         {
 425                 $doc = new DOMDocument('1.0', 'utf-8');
 426                 $doc->formatOutput = true;
 427
 428                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 429
 430                 $mail = $doc->createElement("dfrn:mail");
 431                 $sender = $doc->createElement("dfrn:sender");
 432
 433                 XML::addElement($doc, $sender, "dfrn:name", $owner['name']);
 434                 XML::addElement($doc, $sender, "dfrn:uri", $owner['url']);
 435                 XML::addElement($doc, $sender, "dfrn:avatar", $owner['thumb']);
 436
 437                 $mail->appendChild($sender);
 438
 439                 XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 440                 XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
 441                 XML::addElement($doc, $mail, "dfrn:sentdate", DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
 442                 XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 443                 XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 444
 445                 $root->appendChild($mail);
 446
 447                 return trim($doc->saveXML());
 448         }
 449
 450         /**
 451          * Create XML text for DFRN friend suggestions
 452          *
 453          * @param array $item  suggestion elements
 454          * @param array $owner Owner record
 455          *
 456          * @return string DFRN suggestions
 457          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 458          * @todo  Find proper type-hints
 459          */
 460         public static function fsuggest($item, $owner)
 461         {
 462                 $doc = new DOMDocument('1.0', 'utf-8');
 463                 $doc->formatOutput = true;
 464
 465                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 466
 467                 $suggest = $doc->createElement("dfrn:suggest");
 468
 469                 XML::addElement($doc, $suggest, "dfrn:url", $item['url']);
 470                 XML::addElement($doc, $suggest, "dfrn:name", $item['name']);
 471                 XML::addElement($doc, $suggest, "dfrn:photo", $item['photo']);
 472                 XML::addElement($doc, $suggest, "dfrn:request", $item['request']);
 473                 XML::addElement($doc, $suggest, "dfrn:note", $item['note']);
 474
 475                 $root->appendChild($suggest);
 476
 477                 return trim($doc->saveXML());
 478         }
 479
 480         /**
 481          * Create XML text for DFRN relocations
 482          *
 483          * @param array $owner Owner record
 484          * @param int   $uid   User ID
 485          *
 486          * @return string DFRN relocations
 487          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 488          * @todo  Find proper type-hints
 489          */
 490         public static function relocate($owner, $uid)
 491         {
 492
 493                 /* get site pubkey. this could be a new installation with no site keys*/
 494                 $pubkey = DI::config()->get('system', 'site_pubkey');
 495                 if (! $pubkey) {
 496                         $res = Crypto::newKeypair(1024);
 497                         DI::config()->set('system', 'site_prvkey', $res['prvkey']);
 498                         DI::config()->set('system', 'site_pubkey', $res['pubkey']);
 499                 }
 500
 501                 $rp = q(
 502                         "SELECT `resource-id` , `scale`, type FROM `photo`
 503                                 WHERE `profile` = 1 AND `uid` = %d ORDER BY scale;",
 504                         $uid
 505                 );
 506                 $photos = [];
 507                 $ext = Images::supportedTypes();
 508
 509                 foreach ($rp as $p) {
 510                         $photos[$p['scale']] = DI::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
 511                 }
 512
 513
 514                 $doc = new DOMDocument('1.0', 'utf-8');
 515                 $doc->formatOutput = true;
 516
 517                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 518
 519                 $relocate = $doc->createElement("dfrn:relocate");
 520
 521                 XML::addElement($doc, $relocate, "dfrn:url", $owner['url']);
 522                 XML::addElement($doc, $relocate, "dfrn:name", $owner['name']);
 523                 XML::addElement($doc, $relocate, "dfrn:addr", $owner['addr']);
 524                 XML::addElement($doc, $relocate, "dfrn:avatar", $owner['avatar']);
 525                 XML::addElement($doc, $relocate, "dfrn:photo", $photos[4]);
 526                 XML::addElement($doc, $relocate, "dfrn:thumb", $photos[5]);
 527                 XML::addElement($doc, $relocate, "dfrn:micro", $photos[6]);
 528                 XML::addElement($doc, $relocate, "dfrn:request", $owner['request']);
 529                 XML::addElement($doc, $relocate, "dfrn:confirm", $owner['confirm']);
 530                 XML::addElement($doc, $relocate, "dfrn:notify", $owner['notify']);
 531                 XML::addElement($doc, $relocate, "dfrn:poll", $owner['poll']);
 532                 XML::addElement($doc, $relocate, "dfrn:sitepubkey", DI::config()->get('system', 'site_pubkey'));
 533
 534                 $root->appendChild($relocate);
 535
 536                 return trim($doc->saveXML());
 537         }
 538
 539         /**
 540          * Adds the header elements for the DFRN protocol
 541          *
 542          * @param DOMDocument $doc           XML document
 543          * @param array       $owner         Owner record
 544          * @param string      $authorelement Element name for the author
 545          * @param string      $alternatelink link to profile or category
 546          * @param bool        $public        Is it a header for public posts?
 547          *
 548          * @return object XML root object
 549          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 550          * @todo  Find proper type-hints
 551          */
 552         private static function addHeader(DOMDocument $doc, $owner, $authorelement, $alternatelink = "", $public = false)
 553         {
 554
 555                 if ($alternatelink == "") {
 556                         $alternatelink = $owner['url'];
 557                 }
 558
 559                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 560                 $doc->appendChild($root);
 561
 562                 $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 563                 $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 564                 $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 565                 $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 566                 $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 567                 $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 568                 $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 569                 $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 570                 $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 571
 572                 XML::addElement($doc, $root, "id", DI::baseUrl()."/profile/".$owner["nick"]);
 573                 XML::addElement($doc, $root, "title", $owner["name"]);
 574
 575                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION];
 576                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 577
 578                 $attributes = ["rel" => "license", "href" => "http://creativecommons.org/licenses/by/3.0/"];
 579                 XML::addElement($doc, $root, "link", "", $attributes);
 580
 581                 $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $alternatelink];
 582                 XML::addElement($doc, $root, "link", "", $attributes);
 583
 584
 585                 if ($public) {
 586                         // DFRN itself doesn't uses this. But maybe someone else wants to subscribe to the public feed.
 587                         OStatus::hublinks($doc, $root, $owner["nick"]);
 588
 589                         $attributes = ["rel" => "salmon", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 590                         XML::addElement($doc, $root, "link", "", $attributes);
 591
 592                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-replies", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 593                         XML::addElement($doc, $root, "link", "", $attributes);
 594
 595                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-mention", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 596                         XML::addElement($doc, $root, "link", "", $attributes);
 597                 }
 598
 599                 // For backward compatibility we keep this element
 600                 if ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
 601                         XML::addElement($doc, $root, "dfrn:community", 1);
 602                 }
 603
 604                 // The former element is replaced by this one
 605                 XML::addElement($doc, $root, "dfrn:account_type", $owner["account-type"]);
 606
 607                 /// @todo We need a way to transmit the different page flags like "User::PAGE_FLAGS_PRVGROUP"
 608
 609                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 610
 611                 $author = self::addAuthor($doc, $owner, $authorelement, $public);
 612                 $root->appendChild($author);
 613
 614                 return $root;
 615         }
 616
 617         /**
 618          * Adds the author element in the header for the DFRN protocol
 619          *
 620          * @param DOMDocument $doc           XML document
 621          * @param array       $owner         Owner record
 622          * @param string      $authorelement Element name for the author
 623          * @param boolean     $public        boolean
 624          *
 625          * @return \DOMElement XML author object
 626          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 627          * @todo  Find proper type-hints
 628          */
 629         private static function addAuthor(DOMDocument $doc, array $owner, $authorelement, $public)
 630         {
 631                 // Should the profile be "unsearchable" in the net? Then add the "hide" element
 632                 $hide = DBA::exists('profile', ['uid' => $owner['uid'], 'net-publish' => false]);
 633
 634                 $author = $doc->createElement($authorelement);
 635
 636                 $namdate = DateTimeFormat::utc($owner['name-date'].'+00:00', DateTimeFormat::ATOM);
 637                 $picdate = DateTimeFormat::utc($owner['avatar-date'].'+00:00', DateTimeFormat::ATOM);
 638
 639                 $attributes = [];
 640
 641                 if (!$public || !$hide) {
 642                         $attributes = ["dfrn:updated" => $namdate];
 643                 }
 644
 645                 XML::addElement($doc, $author, "name", $owner["name"], $attributes);
 646                 XML::addElement($doc, $author, "uri", DI::baseUrl().'/profile/'.$owner["nickname"], $attributes);
 647                 XML::addElement($doc, $author, "dfrn:handle", $owner["addr"], $attributes);
 648
 649                 $attributes = ["rel" => "photo", "type" => "image/jpeg",
 650                                         "media:width" => 300, "media:height" => 300, "href" => $owner['photo']];
 651
 652                 if (!$public || !$hide) {
 653                         $attributes["dfrn:updated"] = $picdate;
 654                 }
 655
 656                 XML::addElement($doc, $author, "link", "", $attributes);
 657
 658                 $attributes["rel"] = "avatar";
 659                 XML::addElement($doc, $author, "link", "", $attributes);
 660
 661                 if ($hide) {
 662                         XML::addElement($doc, $author, "dfrn:hide", "true");
 663                 }
 664
 665                 // The following fields will only be generated if the data isn't meant for a public feed
 666                 if ($public) {
 667                         return $author;
 668                 }
 669
 670                 $birthday = feed_birthday($owner['uid'], $owner['timezone']);
 671
 672                 if ($birthday) {
 673                         XML::addElement($doc, $author, "dfrn:birthday", $birthday);
 674                 }
 675
 676                 // Only show contact details when we are allowed to
 677                 $profile = DBA::selectFirst('owner-view',
 678                         ['about', 'name', 'homepage', 'nickname', 'timezone', 'locality', 'region', 'country-name', 'pub_keywords', 'xmpp', 'dob'],
 679                         ['uid' => $owner['uid'], 'hidewall' => false]);
 680                 if (DBA::isResult($profile)) {
 681                         XML::addElement($doc, $author, "poco:displayName", $profile["name"]);
 682                         XML::addElement($doc, $author, "poco:updated", $namdate);
 683
 684                         if (trim($profile["dob"]) > DBA::NULL_DATE) {
 685                                 XML::addElement($doc, $author, "poco:birthday", "0000-".date("m-d", strtotime($profile["dob"])));
 686                         }
 687
 688                         XML::addElement($doc, $author, "poco:note", $profile["about"]);
 689                         XML::addElement($doc, $author, "poco:preferredUsername", $profile["nickname"]);
 690
 691                         $savetz = date_default_timezone_get();
 692                         date_default_timezone_set($profile["timezone"]);
 693                         XML::addElement($doc, $author, "poco:utcOffset", date("P"));
 694                         date_default_timezone_set($savetz);
 695
 696                         if (trim($profile["homepage"]) != "") {
 697                                 $urls = $doc->createElement("poco:urls");
 698                                 XML::addElement($doc, $urls, "poco:type", "homepage");
 699                                 XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
 700                                 XML::addElement($doc, $urls, "poco:primary", "true");
 701                                 $author->appendChild($urls);
 702                         }
 703
 704                         if (trim($profile["pub_keywords"]) != "") {
 705                                 $keywords = explode(",", $profile["pub_keywords"]);
 706
 707                                 foreach ($keywords as $keyword) {
 708                                         XML::addElement($doc, $author, "poco:tags", trim($keyword));
 709                                 }
 710                         }
 711
 712                         if (trim($profile["xmpp"]) != "") {
 713                                 $ims = $doc->createElement("poco:ims");
 714                                 XML::addElement($doc, $ims, "poco:type", "xmpp");
 715                                 XML::addElement($doc, $ims, "poco:value", $profile["xmpp"]);
 716                                 XML::addElement($doc, $ims, "poco:primary", "true");
 717                                 $author->appendChild($ims);
 718                         }
 719
 720                         if (trim($profile["locality"].$profile["region"].$profile["country-name"]) != "") {
 721                                 $element = $doc->createElement("poco:address");
 722
 723                                 XML::addElement($doc, $element, "poco:formatted", Profile::formatLocation($profile));
 724
 725                                 if (trim($profile["locality"]) != "") {
 726                                         XML::addElement($doc, $element, "poco:locality", $profile["locality"]);
 727                                 }
 728
 729                                 if (trim($profile["region"]) != "") {
 730                                         XML::addElement($doc, $element, "poco:region", $profile["region"]);
 731                                 }
 732
 733                                 if (trim($profile["country-name"]) != "") {
 734                                         XML::addElement($doc, $element, "poco:country", $profile["country-name"]);
 735                                 }
 736
 737                                 $author->appendChild($element);
 738                         }
 739                 }
 740
 741                 return $author;
 742         }
 743
 744         /**
 745          * Adds the author elements in the "entry" elements of the DFRN protocol
 746          *
 747          * @param DOMDocument $doc         XML document
 748          * @param string $element     Element name for the author
 749          * @param string $contact_url Link of the contact
 750          * @param array  $item        Item elements
 751          *
 752          * @return \DOMElement XML author object
 753          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 754          * @todo  Find proper type-hints
 755          */
 756         private static function addEntryAuthor(DOMDocument $doc, $element, $contact_url, $item)
 757         {
 758                 $author = $doc->createElement($element);
 759
 760                 $contact = Contact::getByURLForUser($contact_url, $item["uid"], false, ['url', 'name', 'addr', 'photo']);
 761                 if (!empty($contact)) {
 762                         XML::addElement($doc, $author, "name", $contact["name"]);
 763                         XML::addElement($doc, $author, "uri", $contact["url"]);
 764                         XML::addElement($doc, $author, "dfrn:handle", $contact["addr"]);
 765
 766                         /// @Todo
 767                         /// - Check real image type and image size
 768                         /// - Check which of these boths elements we should use
 769                         $attributes = [
 770                                 "rel" => "photo",
 771                                 "type" => "image/jpeg",
 772                                 "media:width" => 80,
 773                                 "media:height" => 80,
 774                                 "href" => $contact["photo"]];
 775                         XML::addElement($doc, $author, "link", "", $attributes);
 776
 777                         $attributes = [
 778                                 "rel" => "avatar",
 779                                 "type" => "image/jpeg",
 780                                 "media:width" => 80,
 781                                 "media:height" => 80,
 782                                 "href" => $contact["photo"]];
 783                         XML::addElement($doc, $author, "link", "", $attributes);
 784                 }
 785
 786                 return $author;
 787         }
 788
 789         /**
 790          * Adds the activity elements
 791          *
 792          * @param DOMDocument $doc      XML document
 793          * @param string      $element  Element name for the activity
 794          * @param string      $activity activity value
 795          *
 796          * @return \DOMElement XML activity object
 797          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 798          * @todo  Find proper type-hints
 799          */
 800         private static function createActivity(DOMDocument $doc, $element, $activity)
 801         {
 802                 if ($activity) {
 803                         $entry = $doc->createElement($element);
 804
 805                         $r = XML::parseString($activity);
 806                         if (!$r) {
 807                                 return false;
 808                         }
 809
 810                         if ($r->type) {
 811                                 XML::addElement($doc, $entry, "activity:object-type", $r->type);
 812                         }
 813
 814                         if ($r->id) {
 815                                 XML::addElement($doc, $entry, "id", $r->id);
 816                         }
 817
 818                         if ($r->title) {
 819                                 XML::addElement($doc, $entry, "title", $r->title);
 820                         }
 821
 822                         if ($r->link) {
 823                                 if (substr($r->link, 0, 1) == '<') {
 824                                         if (strstr($r->link, '&') && (! strstr($r->link, '&amp;'))) {
 825                                                 $r->link = str_replace('&', '&amp;', $r->link);
 826                                         }
 827
 828                                         $r->link = preg_replace('/\<link(.*?)\"\>/', '<link$1"/>', $r->link);
 829
 830                                         // XML does need a single element as root element so we add a dummy element here
 831                                         $data = XML::parseString("<dummy>" . $r->link . "</dummy>");
 832                                         if (is_object($data)) {
 833                                                 foreach ($data->link as $link) {
 834                                                         $attributes = [];
 835                                                         foreach ($link->attributes() as $parameter => $value) {
 836                                                                 $attributes[$parameter] = $value;
 837                                                         }
 838                                                         XML::addElement($doc, $entry, "link", "", $attributes);
 839                                                 }
 840                                         }
 841                                 } else {
 842                                         $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $r->link];
 843                                         XML::addElement($doc, $entry, "link", "", $attributes);
 844                                 }
 845                         }
 846                         if ($r->content) {
 847                                 XML::addElement($doc, $entry, "content", BBCode::convert($r->content), ["type" => "html"]);
 848                         }
 849
 850                         return $entry;
 851                 }
 852
 853                 return false;
 854         }
 855
 856         /**
 857          * Adds the elements for attachments
 858          *
 859          * @param object $doc  XML document
 860          * @param object $root XML root
 861          * @param array  $item Item element
 862          *
 863          * @return void XML attachment object
 864          * @todo  Find proper type-hints
 865          */
 866         private static function getAttachment($doc, $root, $item)
 867         {
 868                 $arr = explode('[/attach],', $item['attach']);
 869                 if (count($arr)) {
 870                         foreach ($arr as $r) {
 871                                 $matches = false;
 872                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 873                                 if ($cnt) {
 874                                         $attributes = ["rel" => "enclosure",
 875                                                         "href" => $matches[1],
 876                                                         "type" => $matches[3]];
 877
 878                                         if (intval($matches[2])) {
 879                                                 $attributes["length"] = intval($matches[2]);
 880                                         }
 881
 882                                         if (trim($matches[4]) != "") {
 883                                                 $attributes["title"] = trim($matches[4]);
 884                                         }
 885
 886                                         XML::addElement($doc, $root, "link", "", $attributes);
 887                                 }
 888                         }
 889                 }
 890         }
 891
 892         /**
 893          * Adds the "entry" elements for the DFRN protocol
 894          *
 895          * @param DOMDocument $doc     XML document
 896          * @param string      $type    "text" or "html"
 897          * @param array       $item    Item element
 898          * @param array       $owner   Owner record
 899          * @param bool        $comment Trigger the sending of the "comment" element
 900          * @param int         $cid     Contact ID of the recipient
 901          * @param bool        $single  If set, the entry is created as an XML document with a single "entry" element
 902          *
 903          * @return null|\DOMElement XML entry object
 904          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 905          * @throws \ImagickException
 906          * @todo  Find proper type-hints
 907          */
 908         private static function entry(DOMDocument $doc, $type, array $item, array $owner, $comment = false, $cid = 0, $single = false)
 909         {
 910                 $mentioned = [];
 911
 912                 if (!$item['parent']) {
 913                         Logger::notice('Item without parent found.', ['type' => $type, 'item' => $item]);
 914                         return null;
 915                 }
 916
 917                 if ($item['deleted']) {
 918                         $attributes = ["ref" => $item['uri'], "when" => DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM)];
 919                         return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 920                 }
 921
 922                 if (!$single) {
 923                         $entry = $doc->createElement("entry");
 924                 } else {
 925                         $entry = $doc->createElementNS(ActivityNamespace::ATOM1, 'entry');
 926                         $doc->appendChild($entry);
 927
 928                         $entry->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 929                         $entry->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 930                         $entry->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 931                         $entry->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 932                         $entry->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 933                         $entry->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 934                         $entry->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 935                         $entry->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 936                         $entry->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 937                 }
 938
 939                 if ($item['private'] == Item::PRIVATE) {
 940                         $body = Item::fixPrivatePhotos($item['body'], $owner['uid'], $item, $cid);
 941                 } else {
 942                         $body = $item['body'];
 943                 }
 944
 945                 // Remove the abstract element. It is only locally important.
 946                 $body = BBCode::stripAbstract($body);
 947
 948                 $htmlbody = '';
 949                 if ($type == 'html') {
 950                         $htmlbody = $body;
 951
 952                         if ($item['title'] != "") {
 953                                 $htmlbody = "[b]" . $item['title'] . "[/b]\n\n" . $htmlbody;
 954                         }
 955
 956                         $htmlbody = BBCode::convert($htmlbody, false, BBCode::OSTATUS);
 957                 }
 958
 959                 $author = self::addEntryAuthor($doc, "author", $item["author-link"], $item);
 960                 $entry->appendChild($author);
 961
 962                 $dfrnowner = self::addEntryAuthor($doc, "dfrn:owner", $item["owner-link"], $item);
 963                 $entry->appendChild($dfrnowner);
 964
 965                 if ($item['gravity'] != GRAVITY_PARENT) {
 966                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 967                         $parent = Item::selectFirst(['guid', 'plink'], ['uri' => $parent_item, 'uid' => $item['uid']]);
 968                         if (DBA::isResult($parent)) {
 969                                 $attributes = ["ref" => $parent_item, "type" => "text/html",
 970                                         "href" => $parent['plink'],
 971                                         "dfrn:diaspora_guid" => $parent['guid']];
 972                                 XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 973                         }
 974                 }
 975
 976                 // Add conversation data. This is used for OStatus
 977                 $conversation_href = DI::baseUrl()."/display/".$item["parent-guid"];
 978                 $conversation_uri = $conversation_href;
 979
 980                 if (isset($parent_item)) {
 981                         $conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $item['parent-uri']]);
 982                         if (DBA::isResult($conversation)) {
 983                                 if ($conversation['conversation-uri'] != '') {
 984                                         $conversation_uri = $conversation['conversation-uri'];
 985                                 }
 986                                 if ($conversation['conversation-href'] != '') {
 987                                         $conversation_href = $conversation['conversation-href'];
 988                                 }
 989                         }
 990                 }
 991
 992                 $attributes = [
 993                                 "href" => $conversation_href,
 994                                 "ref" => $conversation_uri];
 995
 996                 XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
 997
 998                 XML::addElement($doc, $entry, "id", $item["uri"]);
 999                 XML::addElement($doc, $entry, "title", $item["title"]);
1000
1001                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"] . "+00:00", DateTimeFormat::ATOM));
1002                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"] . "+00:00", DateTimeFormat::ATOM));
1003
1004                 // "dfrn:env" is used to read the content
1005                 XML::addElement($doc, $entry, "dfrn:env", Strings::base64UrlEncode($body, true));
1006
1007                 // The "content" field is not read by the receiver. We could remove it when the type is "text"
1008                 // We keep it at the moment, maybe there is some old version that doesn't read "dfrn:env"
1009                 XML::addElement($doc, $entry, "content", (($type == 'html') ? $htmlbody : $body), ["type" => $type]);
1010
1011                 // We save this value in "plink". Maybe we should read it from there as well?
1012                 XML::addElement(
1013                         $doc,
1014                         $entry,
1015                         "link",
1016                         "",
1017                         ["rel" => "alternate", "type" => "text/html",
1018                                  "href" => DI::baseUrl() . "/display/" . $item["guid"]]
1019                 );
1020
1021                 // "comment-allow" is some old fashioned stuff for old Friendica versions.
1022                 // It is included in the rewritten code for completeness
1023                 if ($comment) {
1024                         XML::addElement($doc, $entry, "dfrn:comment-allow", 1);
1025                 }
1026
1027                 if ($item['location']) {
1028                         XML::addElement($doc, $entry, "dfrn:location", $item['location']);
1029                 }
1030
1031                 if ($item['coord']) {
1032                         XML::addElement($doc, $entry, "georss:point", $item['coord']);
1033                 }
1034
1035                 if ($item['private']) {
1036                         // Friendica versions prior to 2020.3 can't handle "unlisted" properly. So we can only transmit public and private
1037                         XML::addElement($doc, $entry, "dfrn:private", ($item['private'] == Item::PRIVATE ? Item::PRIVATE : Item::PUBLIC));
1038                         XML::addElement($doc, $entry, "dfrn:unlisted", $item['private'] == Item::UNLISTED);
1039                 }
1040
1041                 if ($item['extid']) {
1042                         XML::addElement($doc, $entry, "dfrn:extid", $item['extid']);
1043                 }
1044
1045                 if ($item['post-type'] == Item::PT_PAGE) {
1046                         XML::addElement($doc, $entry, "dfrn:bookmark", "true");
1047                 }
1048
1049                 if ($item['app']) {
1050                         XML::addElement($doc, $entry, "statusnet:notice_info", "", ["local_id" => $item['id'], "source" => $item['app']]);
1051                 }
1052
1053                 XML::addElement($doc, $entry, "dfrn:diaspora_guid", $item["guid"]);
1054
1055                 // The signed text contains the content in Markdown, the sender handle and the signatur for the content
1056                 // It is needed for relayed comments to Diaspora.
1057                 if ($item['signed_text']) {
1058                         $sign = base64_encode(json_encode(['signed_text' => $item['signed_text'],'signature' => '','signer' => '']));
1059                         XML::addElement($doc, $entry, "dfrn:diaspora_signature", $sign);
1060                 }
1061
1062                 XML::addElement($doc, $entry, "activity:verb", self::constructVerb($item));
1063
1064                 if ($item['object-type'] != "") {
1065                         XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
1066                 } elseif ($item['gravity'] == GRAVITY_PARENT) {
1067                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::NOTE);
1068                 } else {
1069                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::COMMENT);
1070                 }
1071
1072                 $actobj = self::createActivity($doc, "activity:object", $item['object']);
1073                 if ($actobj) {
1074                         $entry->appendChild($actobj);
1075                 }
1076
1077                 $actarg = self::createActivity($doc, "activity:target", $item['target']);
1078                 if ($actarg) {
1079                         $entry->appendChild($actarg);
1080                 }
1081
1082                 $tags = Tag::getByURIId($item['uri-id']);
1083
1084                 if (count($tags)) {
1085                         foreach ($tags as $tag) {
1086                                 if (($type != 'html') || ($tag['type'] == Tag::HASHTAG)) {
1087                                         XML::addElement($doc, $entry, "category", "", ["scheme" => "X-DFRN:" . Tag::TAG_CHARACTER[$tag['type']] . ":" . $tag['url'], "term" => $tag['name']]);
1088                                 }
1089                                 if ($tag['type'] != Tag::HASHTAG) {
1090                                         $mentioned[$tag['url']] = $tag['url'];
1091                                 }
1092                         }
1093                 }
1094
1095                 foreach ($mentioned as $mention) {
1096                         $condition = ['uid' => $owner["uid"], 'nurl' => Strings::normaliseLink($mention)];
1097                         $contact = DBA::selectFirst('contact', ['forum', 'prv'], $condition);
1098
1099                         if (DBA::isResult($contact) && ($contact["forum"] || $contact["prv"])) {
1100                                 XML::addElement(
1101                                         $doc,
1102                                         $entry,
1103                                         "link",
1104                                         "",
1105                                         ["rel" => "mentioned",
1106                                                         "ostatus:object-type" => Activity\ObjectType::GROUP,
1107                                                         "href" => $mention]
1108                                 );
1109                         } else {
1110                                 XML::addElement(
1111                                         $doc,
1112                                         $entry,
1113                                         "link",
1114                                         "",
1115                                         ["rel" => "mentioned",
1116                                                         "ostatus:object-type" => Activity\ObjectType::PERSON,
1117                                                         "href" => $mention]
1118                                 );
1119                         }
1120                 }
1121
1122                 self::getAttachment($doc, $entry, $item);
1123
1124                 return $entry;
1125         }
1126
1127         /**
1128          * encrypts data via AES
1129          *
1130          * @param string $data The data that is to be encrypted
1131          * @param string $key  The AES key
1132          *
1133          * @return string encrypted data
1134          */
1135         private static function aesEncrypt($data, $key)
1136         {
1137                 return openssl_encrypt($data, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1138         }
1139
1140         /**
1141          * decrypts data via AES
1142          *
1143          * @param string $encrypted The encrypted data
1144          * @param string $key       The AES key
1145          *
1146          * @return string decrypted data
1147          */
1148         public static function aesDecrypt($encrypted, $key)
1149         {
1150                 return openssl_decrypt($encrypted, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1151         }
1152
1153         /**
1154          * Delivers the atom content to the contacts
1155          *
1156          * @param array  $owner    Owner record
1157          * @param array  $contact  Contact record of the receiver
1158          * @param string $atom     Content that will be transmitted
1159          * @param bool   $dissolve (to be documented)
1160          *
1161          * @return int Deliver status. Negative values mean an error.
1162          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1163          * @throws \ImagickException
1164          * @todo  Add array type-hint for $owner, $contact
1165          */
1166         public static function deliver($owner, $contact, $atom, $dissolve = false)
1167         {
1168                 $idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);
1169
1170                 if ($contact['duplex'] && $contact['dfrn-id']) {
1171                         $idtosend = '0:' . $orig_id;
1172                 }
1173                 if ($contact['duplex'] && $contact['issued-id']) {
1174                         $idtosend = '1:' . $orig_id;
1175                 }
1176
1177                 $rino = DI::config()->get('system', 'rino_encrypt');
1178                 $rino = intval($rino);
1179
1180                 Logger::log("Local rino version: ". $rino, Logger::DEBUG);
1181
1182                 $ssl_val = intval(DI::config()->get('system', 'ssl_policy'));
1183
1184                 switch ($ssl_val) {
1185                         case BaseURL::SSL_POLICY_FULL:
1186                                 $ssl_policy = 'full';
1187                                 break;
1188                         case BaseURL::SSL_POLICY_SELFSIGN:
1189                                 $ssl_policy = 'self';
1190                                 break;
1191                         case BaseURL::SSL_POLICY_NONE:
1192                         default:
1193                                 $ssl_policy = 'none';
1194                                 break;
1195                 }
1196
1197                 $url = $contact['notify'] . '&dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino='.$rino : '');
1198
1199                 Logger::log('dfrn_deliver: ' . $url);
1200
1201                 $curlResult = DI::httpRequest()->get($url);
1202
1203                 if ($curlResult->isTimeout()) {
1204                         return -2; // timed out
1205                 }
1206
1207                 $xml = $curlResult->getBody();
1208
1209                 $curl_stat = $curlResult->getReturnCode();
1210                 if (empty($curl_stat)) {
1211                         return -3; // timed out
1212                 }
1213
1214                 Logger::log('dfrn_deliver: ' . $xml, Logger::DATA);
1215
1216                 if (empty($xml)) {
1217                         return 3;
1218                 }
1219
1220                 if (strpos($xml, '<?xml') === false) {
1221                         Logger::log('dfrn_deliver: no valid XML returned');
1222                         Logger::log('dfrn_deliver: returned XML: ' . $xml, Logger::DATA);
1223                         return 3;
1224                 }
1225
1226                 $res = XML::parseString($xml);
1227
1228                 if (!is_object($res) || (intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
1229                         if (empty($res->status)) {
1230                                 $status = 3;
1231                         } else {
1232                                 $status = $res->status;
1233                         }
1234
1235                         return $status;
1236                 }
1237
1238                 $postvars     = [];
1239                 $sent_dfrn_id = hex2bin((string) $res->dfrn_id);
1240                 $challenge    = hex2bin((string) $res->challenge);
1241                 $perm         = (($res->perm) ? $res->perm : null);
1242                 $dfrn_version = floatval($res->dfrn_version ?: 2.0);
1243                 $rino_remote_version = intval($res->rino);
1244                 $page         = (($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? 1 : 0);
1245
1246                 Logger::log("Remote rino version: ".$rino_remote_version." for ".$contact["url"], Logger::DEBUG);
1247
1248                 if ($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
1249                         $page = 2;
1250                 }
1251
1252                 $final_dfrn_id = '';
1253
1254                 if ($perm) {
1255                         if ((($perm == 'rw') && !intval($contact['writable']))
1256                                 || (($perm == 'r') && intval($contact['writable']))
1257                         ) {
1258                                 DBA::update('contact', ['writable' => ($perm == 'rw')], ['id' => $contact['id']]);
1259
1260                                 $contact['writable'] = (string) 1 - intval($contact['writable']);
1261                         }
1262                 }
1263
1264                 if (($contact['duplex'] && strlen($contact['pubkey']))
1265                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1266                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1267                 ) {
1268                         openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
1269                         openssl_public_decrypt($challenge, $postvars['challenge'], $contact['pubkey']);
1270                 } else {
1271                         openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
1272                         openssl_private_decrypt($challenge, $postvars['challenge'], $contact['prvkey']);
1273                 }
1274
1275                 $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
1276
1277                 if (strpos($final_dfrn_id, ':') == 1) {
1278                         $final_dfrn_id = substr($final_dfrn_id, 2);
1279                 }
1280
1281                 if ($final_dfrn_id != $orig_id) {
1282                         Logger::log('dfrn_deliver: wrong dfrn_id.');
1283                         // did not decode properly - cannot trust this site
1284                         return 3;
1285                 }
1286
1287                 $postvars['dfrn_id']      = $idtosend;
1288                 $postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
1289                 if ($dissolve) {
1290                         $postvars['dissolve'] = '1';
1291                 }
1292
1293                 if ((($contact['rel']) && ($contact['rel'] != Contact::SHARING) && (! $contact['blocked'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1294                         $postvars['data'] = $atom;
1295                         $postvars['perm'] = 'rw';
1296                 } else {
1297                         $postvars['data'] = str_replace('<dfrn:comment-allow>1', '<dfrn:comment-allow>0', $atom);
1298                         $postvars['perm'] = 'r';
1299                 }
1300
1301                 $postvars['ssl_policy'] = $ssl_policy;
1302
1303                 if ($page) {
1304                         $postvars['page'] = $page;
1305                 }
1306
1307
1308                 if ($rino > 0 && $rino_remote_version > 0 && (! $dissolve)) {
1309                         Logger::log('rino version: '. $rino_remote_version);
1310
1311                         switch ($rino_remote_version) {
1312                                 case 1:
1313                                         $key = openssl_random_pseudo_bytes(16);
1314                                         $data = self::aesEncrypt($postvars['data'], $key);
1315                                         break;
1316
1317                                 default:
1318                                         Logger::log("rino: invalid requested version '$rino_remote_version'");
1319                                         return -8;
1320                         }
1321
1322                         $postvars['rino'] = $rino_remote_version;
1323                         $postvars['data'] = bin2hex($data);
1324
1325                         if ($dfrn_version >= 2.1) {
1326                                 if (($contact['duplex'] && strlen($contact['pubkey']))
1327                                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1328                                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1329                                 ) {
1330                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1331                                 } else {
1332                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1333                                 }
1334                         } else {
1335                                 if (($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1336                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1337                                 } else {
1338                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1339                                 }
1340                         }
1341
1342                         Logger::log('md5 rawkey ' . md5($postvars['key']));
1343
1344                         $postvars['key'] = bin2hex($postvars['key']);
1345                 }
1346
1347
1348                 Logger::debug('dfrn_deliver', ['post' => $postvars]);
1349
1350                 $postResult = DI::httpRequest()->post($contact['notify'], $postvars);
1351
1352                 $xml = $postResult->getBody();
1353
1354                 Logger::log('dfrn_deliver: ' . "RECEIVED: " . $xml, Logger::DATA);
1355
1356                 $curl_stat = $postResult->getReturnCode();
1357                 if (empty($curl_stat) || empty($xml)) {
1358                         return -9; // timed out
1359                 }
1360
1361                 if (($curl_stat == 503) && $postResult->inHeader('retry-after')) {
1362                         return -10;
1363                 }
1364
1365                 if (strpos($xml, '<?xml') === false) {
1366                         Logger::log('dfrn_deliver: phase 2: no valid XML returned');
1367                         Logger::log('dfrn_deliver: phase 2: returned XML: ' . $xml, Logger::DATA);
1368                         return 3;
1369                 }
1370
1371                 $res = XML::parseString($xml);
1372
1373                 if (!isset($res->status)) {
1374                         return -11;
1375                 }
1376
1377                 // Possibly old servers had returned an empty value when everything was okay
1378                 if (empty($res->status)) {
1379                         $res->status = 200;
1380                 }
1381
1382                 if (!empty($res->message)) {
1383                         Logger::log('Delivery returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1384                 }
1385
1386                 return intval($res->status);
1387         }
1388
1389         /**
1390          * Transmits atom content to the contacts via the Diaspora transport layer
1391          *
1392          * @param array  $owner   Owner record
1393          * @param array  $contact Contact record of the receiver
1394          * @param string $atom    Content that will be transmitted
1395          *
1396          * @param bool   $public_batch
1397          * @return int Deliver status. Negative values mean an error.
1398          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1399          * @throws \ImagickException
1400          */
1401         public static function transmit($owner, $contact, $atom, $public_batch = false)
1402         {
1403                 if (!$public_batch) {
1404                         if (empty($contact['addr'])) {
1405                                 Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
1406                                 if (Contact::updateFromProbe($contact['id'])) {
1407                                         $new_contact = DBA::selectFirst('contact', ['addr'], ['id' => $contact['id']]);
1408                                         $contact['addr'] = $new_contact['addr'];
1409                                 }
1410
1411                                 if (empty($contact['addr'])) {
1412                                         Logger::log('Unable to find contact handle for ' . $contact['id'] . ' - ' . $contact['url']);
1413                                         return -21;
1414                                 }
1415                         }
1416
1417                         $fcontact = FContact::getByURL($contact['addr']);
1418                         if (empty($fcontact)) {
1419                                 Logger::log('Unable to find contact details for ' . $contact['id'] . ' - ' . $contact['addr']);
1420                                 return -22;
1421                         }
1422                         $pubkey = $fcontact['pubkey'];
1423                 } else {
1424                         $pubkey = '';
1425                 }
1426
1427                 $envelope = Diaspora::buildMessage($atom, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
1428
1429                 // Create the endpoint for public posts. This is some WIP and should later be added to the probing
1430                 if ($public_batch && empty($contact["batch"])) {
1431                         $parts = parse_url($contact["notify"]);
1432                         $path_parts = explode('/', $parts['path']);
1433                         array_pop($path_parts);
1434                         $parts['path'] =  implode('/', $path_parts);
1435                         $contact["batch"] = Network::unparseURL($parts);
1436                 }
1437
1438                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
1439
1440                 if (empty($dest_url)) {
1441                         Logger::info('Empty destination', ['public' => $public_batch, 'contact' => $contact]);
1442                         return -24;
1443                 }
1444
1445                 $content_type = ($public_batch ? "application/magic-envelope+xml" : "application/json");
1446
1447                 $postResult = DI::httpRequest()->post($dest_url, $envelope, ["Content-Type: " . $content_type]);
1448                 $xml = $postResult->getBody();
1449
1450                 $curl_stat = $postResult->getReturnCode();
1451                 if (empty($curl_stat) || empty($xml)) {
1452                         Logger::log('Empty answer from ' . $contact['id'] . ' - ' . $dest_url);
1453                         return -9; // timed out
1454                 }
1455
1456                 if (($curl_stat == 503) && $postResult->inHeader('retry-after')) {
1457                         return -10;
1458                 }
1459
1460                 if (strpos($xml, '<?xml') === false) {
1461                         Logger::log('No valid XML returned from ' . $contact['id'] . ' - ' . $dest_url);
1462                         Logger::log('Returned XML: ' . $xml, Logger::DATA);
1463                         return 3;
1464                 }
1465
1466                 $res = XML::parseString($xml);
1467
1468                 if (empty($res->status)) {
1469                         return -23;
1470                 }
1471
1472                 if (!empty($res->message)) {
1473                         Logger::log('Transmit to ' . $dest_url . ' returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1474                 }
1475
1476                 return intval($res->status);
1477         }
1478
1479         /**
1480          * Fetch the author data from head or entry items
1481          *
1482          * @param object $xpath     XPath object
1483          * @param object $context   In which context should the data be searched
1484          * @param array  $importer  Record of the importer user mixed with contact of the content
1485          * @param string $element   Element name from which the data is fetched
1486          * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
1487          * @param string $xml       optional, default empty
1488          *
1489          * @return array Relevant data of the author
1490          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1491          * @throws \ImagickException
1492          * @todo  Find good type-hints for all parameter
1493          */
1494         private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
1495         {
1496                 $author = [];
1497                 $author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
1498                 $author["link"] = XML::getFirstNodeValue($xpath, $element."/atom:uri/text()", $context);
1499
1500                 $fields = ['id', 'uid', 'url', 'network', 'avatar-date', 'avatar', 'name-date', 'uri-date', 'addr',
1501                         'name', 'nick', 'about', 'location', 'keywords', 'xmpp', 'bdyear', 'bd', 'hidden', 'contact-type'];
1502                 $condition = ["`uid` = ? AND `nurl` = ? AND `network` != ? AND NOT `pending` AND NOT `blocked` AND `rel` IN (?, ?)",
1503                         $importer["importer_uid"], Strings::normaliseLink($author["link"]), Protocol::STATUSNET,
1504                         Contact::SHARING, Contact::FRIEND];
1505                 $contact_old = DBA::selectFirst('contact', $fields, $condition);
1506
1507                 if (DBA::isResult($contact_old)) {
1508                         $author["contact-id"] = $contact_old["id"];
1509                         $author["network"] = $contact_old["network"];
1510                 } else {
1511                         if (!$onlyfetch) {
1512                                 Logger::debug("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml);
1513                         }
1514
1515                         $author["contact-unknown"] = true;
1516                         $contact = Contact::getByURL($author["link"], null, ["id", "network"]);
1517                         $author["contact-id"] = $contact["id"] ?? $importer["id"];
1518                         $author["network"] = $contact["network"] ?? $importer["network"];
1519                         $onlyfetch = true;
1520                 }
1521
1522                 // Until now we aren't serving different sizes - but maybe later
1523                 $avatarlist = [];
1524                 /// @todo check if "avatar" or "photo" would be the best field in the specification
1525                 $avatars = $xpath->query($element . "/atom:link[@rel='avatar']", $context);
1526                 foreach ($avatars as $avatar) {
1527                         $href = "";
1528                         $width = 0;
1529                         foreach ($avatar->attributes as $attributes) {
1530                                 /// @TODO Rewrite these similar if() to one switch
1531                                 if ($attributes->name == "href") {
1532                                         $href = $attributes->textContent;
1533                                 }
1534                                 if ($attributes->name == "width") {
1535                                         $width = $attributes->textContent;
1536                                 }
1537                                 if ($attributes->name == "updated") {
1538                                         $author["avatar-date"] = $attributes->textContent;
1539                                 }
1540                         }
1541                         if (($width > 0) && ($href != "")) {
1542                                 $avatarlist[$width] = $href;
1543                         }
1544                 }
1545
1546                 if (count($avatarlist) > 0) {
1547                         krsort($avatarlist);
1548                         $author["avatar"] = current($avatarlist);
1549                 }
1550
1551                 if (empty($author['avatar']) && !empty($author['link'])) {
1552                         $cid = Contact::getIdForURL($author['link'], 0);
1553                         if (!empty($cid)) {
1554                                 $contact = DBA::selectFirst('contact', ['avatar'], ['id' => $cid]);
1555                                 if (DBA::isResult($contact)) {
1556                                         $author['avatar'] = $contact['avatar'];
1557                                 }
1558                         }
1559                 }
1560
1561                 if (empty($author['avatar'])) {
1562                         Logger::log('Empty author: ' . $xml);
1563                         $author['avatar'] = '';
1564                 }
1565
1566                 if (DBA::isResult($contact_old) && !$onlyfetch) {
1567                         Logger::log("Check if contact details for contact " . $contact_old["id"] . " (" . $contact_old["nick"] . ") have to be updated.", Logger::DEBUG);
1568
1569                         $poco = ["url" => $contact_old["url"], "network" => $contact_old["network"]];
1570
1571                         // When was the last change to name or uri?
1572                         $name_element = $xpath->query($element . "/atom:name", $context)->item(0);
1573                         foreach ($name_element->attributes as $attributes) {
1574                                 if ($attributes->name == "updated") {
1575                                         $poco["name-date"] = $attributes->textContent;
1576                                 }
1577                         }
1578
1579                         $link_element = $xpath->query($element . "/atom:link", $context)->item(0);
1580                         foreach ($link_element->attributes as $attributes) {
1581                                 if ($attributes->name == "updated") {
1582                                         $poco["uri-date"] = $attributes->textContent;
1583                                 }
1584                         }
1585
1586                         // Update contact data
1587                         $value = XML::getFirstNodeValue($xpath, $element . "/dfrn:handle/text()", $context);
1588                         if ($value != "") {
1589                                 $poco["addr"] = $value;
1590                         }
1591
1592                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:displayName/text()", $context);
1593                         if ($value != "") {
1594                                 $poco["name"] = $value;
1595                         }
1596
1597                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:preferredUsername/text()", $context);
1598                         if ($value != "") {
1599                                 $poco["nick"] = $value;
1600                         }
1601
1602                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:note/text()", $context);
1603                         if ($value != "") {
1604                                 $poco["about"] = $value;
1605                         }
1606
1607                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:address/poco:formatted/text()", $context);
1608                         if ($value != "") {
1609                                 $poco["location"] = $value;
1610                         }
1611
1612                         /// @todo Only search for elements with "poco:type" = "xmpp"
1613                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:ims/poco:value/text()", $context);
1614                         if ($value != "") {
1615                                 $poco["xmpp"] = $value;
1616                         }
1617
1618                         /// @todo Add support for the following fields that we don't support by now in the contact table:
1619                         /// - poco:utcOffset
1620                         /// - poco:urls
1621                         /// - poco:locality
1622                         /// - poco:region
1623                         /// - poco:country
1624
1625                         // If the "hide" element is present then the profile isn't searchable.
1626                         $hide = intval(XML::getFirstNodeValue($xpath, $element . "/dfrn:hide/text()", $context) == "true");
1627
1628                         Logger::log("Hidden status for contact " . $contact_old["url"] . ": " . $hide, Logger::DEBUG);
1629
1630                         // If the contact isn't searchable then set the contact to "hidden".
1631                         // Problem: This can be manually overridden by the user.
1632                         if ($hide) {
1633                                 $contact_old["hidden"] = true;
1634                         }
1635
1636                         // Save the keywords into the contact table
1637                         $tags = [];
1638                         $tagelements = $xpath->evaluate($element . "/poco:tags/text()", $context);
1639                         foreach ($tagelements as $tag) {
1640                                 $tags[$tag->nodeValue] = $tag->nodeValue;
1641                         }
1642
1643                         if (count($tags)) {
1644                                 $poco["keywords"] = implode(", ", $tags);
1645                         }
1646
1647                         // "dfrn:birthday" contains the birthday converted to UTC
1648                         $birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1649
1650                         if (strtotime($birthday) > time()) {
1651                                 $bd_timestamp = strtotime($birthday);
1652
1653                                 $poco["bdyear"] = date("Y", $bd_timestamp);
1654                         }
1655
1656                         // "poco:birthday" is the birthday in the format "yyyy-mm-dd"
1657                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1658
1659                         if (!in_array($value, ["", "0000-00-00", DBA::NULL_DATE])) {
1660                                 $bdyear = date("Y");
1661                                 $value = str_replace(["0000", "0001"], $bdyear, $value);
1662
1663                                 if (strtotime($value) < time()) {
1664                                         $value = str_replace($bdyear, $bdyear + 1, $value);
1665                                 }
1666
1667                                 $poco["bd"] = $value;
1668                         }
1669
1670                         $contact = array_merge($contact_old, $poco);
1671
1672                         if ($contact_old["bdyear"] != $contact["bdyear"]) {
1673                                 Event::createBirthday($contact, $birthday);
1674                         }
1675
1676                         $fields = ['name' => $contact['name'], 'nick' => $contact['nick'], 'about' => $contact['about'],
1677                                 'location' => $contact['location'], 'addr' => $contact['addr'], 'keywords' => $contact['keywords'],
1678                                 'bdyear' => $contact['bdyear'], 'bd' => $contact['bd'], 'hidden' => $contact['hidden'],
1679                                 'xmpp' => $contact['xmpp'], 'name-date' => DateTimeFormat::utc($contact['name-date']),
1680                                 'unsearchable' => $contact['hidden'], 'uri-date' => DateTimeFormat::utc($contact['uri-date'])];
1681
1682                         DBA::update('contact', $fields, ['id' => $contact['id'], 'network' => $contact['network']], $contact_old);
1683
1684                         // Update the public contact. Don't set the "hidden" value, this is used differently for public contacts
1685                         unset($fields['hidden']);
1686                         $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($contact_old['url'])];
1687                         DBA::update('contact', $fields, $condition, true);
1688
1689                         Contact::updateAvatar($contact['id'], $author['avatar']);
1690
1691                         $pcid = Contact::getIdForURL($contact_old['url']);
1692                         if (!empty($pcid)) {
1693                                 Contact::updateAvatar($pcid, $author['avatar']);
1694                         }
1695                 }
1696
1697                 return $author;
1698         }
1699
1700         /**
1701          * Transforms activity objects into an XML string
1702          *
1703          * @param object $xpath    XPath object
1704          * @param object $activity Activity object
1705          * @param string $element  element name
1706          *
1707          * @return string XML string
1708          * @todo Find good type-hints for all parameter
1709          */
1710         private static function transformActivity($xpath, $activity, $element)
1711         {
1712                 if (!is_object($activity)) {
1713                         return "";
1714                 }
1715
1716                 $obj_doc = new DOMDocument("1.0", "utf-8");
1717                 $obj_doc->formatOutput = true;
1718
1719                 $obj_element = $obj_doc->createElementNS( ActivityNamespace::ATOM1, $element);
1720
1721                 $activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
1722                 XML::addElement($obj_doc, $obj_element, "type", $activity_type);
1723
1724                 $id = $xpath->query("atom:id", $activity)->item(0);
1725                 if (is_object($id)) {
1726                         $obj_element->appendChild($obj_doc->importNode($id, true));
1727                 }
1728
1729                 $title = $xpath->query("atom:title", $activity)->item(0);
1730                 if (is_object($title)) {
1731                         $obj_element->appendChild($obj_doc->importNode($title, true));
1732                 }
1733
1734                 $links = $xpath->query("atom:link", $activity);
1735                 if (is_object($links)) {
1736                         foreach ($links as $link) {
1737                                 $obj_element->appendChild($obj_doc->importNode($link, true));
1738                         }
1739                 }
1740
1741                 $content = $xpath->query("atom:content", $activity)->item(0);
1742                 if (is_object($content)) {
1743                         $obj_element->appendChild($obj_doc->importNode($content, true));
1744                 }
1745
1746                 $obj_doc->appendChild($obj_element);
1747
1748                 $objxml = $obj_doc->saveXML($obj_element);
1749
1750                 /// @todo This isn't totally clean. We should find a way to transform the namespaces
1751                 $objxml = str_replace("<".$element.' xmlns="http://www.w3.org/2005/Atom">', "<".$element.">", $objxml);
1752                 return($objxml);
1753         }
1754
1755         /**
1756          * Processes the mail elements
1757          *
1758          * @param object $xpath    XPath object
1759          * @param object $mail     mail elements
1760          * @param array  $importer Record of the importer user mixed with contact of the content
1761          * @return void
1762          * @throws \Exception
1763          * @todo  Find good type-hints for all parameter
1764          */
1765         private static function processMail($xpath, $mail, $importer)
1766         {
1767                 Logger::log("Processing mails");
1768
1769                 $msg = [];
1770                 $msg["uid"] = $importer["importer_uid"];
1771                 $msg["from-name"] = XML::getFirstValue($xpath, "dfrn:sender/dfrn:name/text()", $mail);
1772                 $msg["from-url"] = XML::getFirstValue($xpath, "dfrn:sender/dfrn:uri/text()", $mail);
1773                 $msg["from-photo"] = XML::getFirstValue($xpath, "dfrn:sender/dfrn:avatar/text()", $mail);
1774                 $msg["contact-id"] = $importer["id"];
1775                 $msg["uri"] = XML::getFirstValue($xpath, "dfrn:id/text()", $mail);
1776                 $msg["parent-uri"] = XML::getFirstValue($xpath, "dfrn:in-reply-to/text()", $mail);
1777                 $msg["created"] = DateTimeFormat::utc(XML::getFirstValue($xpath, "dfrn:sentdate/text()", $mail));
1778                 $msg["title"] = XML::getFirstValue($xpath, "dfrn:subject/text()", $mail);
1779                 $msg["body"] = XML::getFirstValue($xpath, "dfrn:content/text()", $mail);
1780
1781                 Mail::insert($msg);
1782         }
1783
1784         /**
1785          * Processes the suggestion elements
1786          *
1787          * @param object $xpath      XPath object
1788          * @param object $suggestion suggestion elements
1789          * @param array  $importer   Record of the importer user mixed with contact of the content
1790          * @return boolean
1791          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1792          * @todo  Find good type-hints for all parameter
1793          */
1794         private static function processSuggestion($xpath, $suggestion, $importer)
1795         {
1796                 Logger::notice('Processing suggestions');
1797
1798                 $url = $xpath->evaluate('string(dfrn:url[1]/text())', $suggestion);
1799                 $cid = Contact::getIdForURL($url);
1800                 $note = $xpath->evaluate('string(dfrn:note[1]/text())', $suggestion);
1801
1802                 return FContact::addSuggestion($importer['importer_uid'], $cid, $importer['id'], $note);
1803         }
1804
1805         /**
1806          * Processes the relocation elements
1807          *
1808          * @param object $xpath      XPath object
1809          * @param object $relocation relocation elements
1810          * @param array  $importer   Record of the importer user mixed with contact of the content
1811          * @return boolean
1812          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1813          * @throws \ImagickException
1814          * @todo  Find good type-hints for all parameter
1815          */
1816         private static function processRelocation($xpath, $relocation, $importer)
1817         {
1818                 Logger::log("Processing relocations");
1819
1820                 /// @TODO Rewrite this to one statement
1821                 $relocate = [];
1822                 $relocate["uid"] = $importer["importer_uid"];
1823                 $relocate["cid"] = $importer["id"];
1824                 $relocate["url"] = $xpath->query("dfrn:url/text()", $relocation)->item(0)->nodeValue;
1825                 $relocate["addr"] = $xpath->query("dfrn:addr/text()", $relocation)->item(0)->nodeValue;
1826                 $relocate["name"] = $xpath->query("dfrn:name/text()", $relocation)->item(0)->nodeValue;
1827                 $relocate["avatar"] = $xpath->query("dfrn:avatar/text()", $relocation)->item(0)->nodeValue;
1828                 $relocate["photo"] = $xpath->query("dfrn:photo/text()", $relocation)->item(0)->nodeValue;
1829                 $relocate["thumb"] = $xpath->query("dfrn:thumb/text()", $relocation)->item(0)->nodeValue;
1830                 $relocate["micro"] = $xpath->query("dfrn:micro/text()", $relocation)->item(0)->nodeValue;
1831                 $relocate["request"] = $xpath->query("dfrn:request/text()", $relocation)->item(0)->nodeValue;
1832                 $relocate["confirm"] = $xpath->query("dfrn:confirm/text()", $relocation)->item(0)->nodeValue;
1833                 $relocate["notify"] = $xpath->query("dfrn:notify/text()", $relocation)->item(0)->nodeValue;
1834                 $relocate["poll"] = $xpath->query("dfrn:poll/text()", $relocation)->item(0)->nodeValue;
1835                 $relocate["sitepubkey"] = $xpath->query("dfrn:sitepubkey/text()", $relocation)->item(0)->nodeValue;
1836
1837                 if (($relocate["avatar"] == "") && ($relocate["photo"] != "")) {
1838                         $relocate["avatar"] = $relocate["photo"];
1839                 }
1840
1841                 if ($relocate["addr"] == "") {
1842                         $relocate["addr"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$3@$2", $relocate["url"]);
1843                 }
1844
1845                 // update contact
1846                 $r = q(
1847                         "SELECT `photo`, `url` FROM `contact` WHERE `id` = %d AND `uid` = %d",
1848                         intval($importer["id"]),
1849                         intval($importer["importer_uid"])
1850                 );
1851
1852                 if (!DBA::isResult($r)) {
1853                         Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
1854                         return false;
1855                 }
1856
1857                 $old = $r[0];
1858
1859                 // Update the contact table. We try to find every entry.
1860                 $fields = ['name' => $relocate["name"], 'avatar' => $relocate["avatar"],
1861                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1862                         'addr' => $relocate["addr"], 'request' => $relocate["request"],
1863                         'confirm' => $relocate["confirm"], 'notify' => $relocate["notify"],
1864                         'poll' => $relocate["poll"], 'site-pubkey' => $relocate["sitepubkey"]];
1865                 $condition = ["(`id` = ?) OR (`nurl` = ?)", $importer["id"], Strings::normaliseLink($old["url"])];
1866
1867                 DBA::update('contact', $fields, $condition);
1868
1869                 Contact::updateAvatar($importer["id"], $relocate["avatar"], true);
1870
1871                 Logger::log('Contacts are updated.');
1872
1873                 /// @TODO
1874                 /// merge with current record, current contents have priority
1875                 /// update record, set url-updated
1876                 /// update profile photos
1877                 /// schedule a scan?
1878                 return true;
1879         }
1880
1881         /**
1882          * Updates an item
1883          *
1884          * @param array $current   the current item record
1885          * @param array $item      the new item record
1886          * @param array $importer  Record of the importer user mixed with contact of the content
1887          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
1888          * @return mixed
1889          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1890          * @todo  set proper type-hints (array?)
1891          */
1892         private static function updateContent($current, $item, $importer, $entrytype)
1893         {
1894                 $changed = false;
1895
1896                 if (self::isEditedTimestampNewer($current, $item)) {
1897                         // do not accept (ignore) an earlier edit than one we currently have.
1898                         if (DateTimeFormat::utc($item["edited"]) < $current["edited"]) {
1899                                 return false;
1900                         }
1901
1902                         $fields = ['title' => $item['title'] ?? '', 'body' => $item['body'] ?? '',
1903                                         'changed' => DateTimeFormat::utcNow(),
1904                                         'edited' => DateTimeFormat::utc($item["edited"])];
1905
1906                         $condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
1907                         Item::update($fields, $condition);
1908
1909                         $changed = true;
1910                 }
1911                 return $changed;
1912         }
1913
1914         /**
1915          * Detects the entry type of the item
1916          *
1917          * @param array $importer Record of the importer user mixed with contact of the content
1918          * @param array $item     the new item record
1919          *
1920          * @return int Is it a toplevel entry, a comment or a relayed comment?
1921          * @throws \Exception
1922          * @todo  set proper type-hints (array?)
1923          */
1924         private static function getEntryType($importer, $item)
1925         {
1926                 if ($item["parent-uri"] != $item["uri"]) {
1927                         $community = false;
1928
1929                         if ($importer["page-flags"] == User::PAGE_FLAGS_COMMUNITY || $importer["page-flags"] == User::PAGE_FLAGS_PRVGROUP) {
1930                                 $sql_extra = "";
1931                                 $community = true;
1932                                 Logger::log("possible community action");
1933                         } else {
1934                                 $sql_extra = " AND `contact`.`self` AND `item`.`wall` ";
1935                         }
1936
1937                         // was the top-level post for this action written by somebody on this site?
1938                         // Specifically, the recipient?
1939
1940                         $is_a_remote_action = false;
1941
1942                         $parent = Item::selectFirst(['parent-uri'], ['uri' => $item["parent-uri"]]);
1943                         if (DBA::isResult($parent)) {
1944                                 $r = q(
1945                                         "SELECT `item`.`forum_mode`, `item`.`wall` FROM `item`
1946                                         INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
1947                                         WHERE `item`.`uri` = '%s' AND (`item`.`parent-uri` = '%s' OR `item`.`thr-parent` = '%s')
1948                                         AND `item`.`uid` = %d
1949                                         $sql_extra
1950                                         LIMIT 1",
1951                                         DBA::escape($parent["parent-uri"]),
1952                                         DBA::escape($parent["parent-uri"]),
1953                                         DBA::escape($parent["parent-uri"]),
1954                                         intval($importer["importer_uid"])
1955                                 );
1956                                 if (DBA::isResult($r)) {
1957                                         $is_a_remote_action = true;
1958                                 }
1959                         }
1960
1961                         /*
1962                          * Does this have the characteristics of a community or private group action?
1963                          * If it's an action to a wall post on a community/prvgroup page it's a
1964                          * valid community action. Also forum_mode makes it valid for sure.
1965                          * If neither, it's not.
1966                          */
1967                         if ($is_a_remote_action && $community && (!$r[0]["forum_mode"]) && (!$r[0]["wall"])) {
1968                                 $is_a_remote_action = false;
1969                                 Logger::log("not a community action");
1970                         }
1971
1972                         if ($is_a_remote_action) {
1973                                 return DFRN::REPLY_RC;
1974                         } else {
1975                                 return DFRN::REPLY;
1976                         }
1977                 } else {
1978                         return DFRN::TOP_LEVEL;
1979                 }
1980         }
1981
1982         /**
1983          * Send a "poke"
1984          *
1985          * @param array $item      The new item record
1986          * @param array $importer  Record of the importer user mixed with contact of the content
1987          * @return void
1988          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1989          * @todo  set proper type-hints (array?)
1990          */
1991         private static function doPoke(array $item, array $importer)
1992         {
1993                 $verb = urldecode(substr($item["verb"], strpos($item["verb"], "#")+1));
1994                 if (!$verb) {
1995                         return;
1996                 }
1997                 $xo = XML::parseString($item["object"]);
1998
1999                 if (($xo->type == Activity\ObjectType::PERSON) && ($xo->id)) {
2000                         // somebody was poked/prodded. Was it me?
2001                         $Blink = '';
2002                         foreach ($xo->link as $l) {
2003                                 $atts = $l->attributes();
2004                                 switch ($atts["rel"]) {
2005                                         case "alternate":
2006                                                 $Blink = $atts["href"];
2007                                                 break;
2008                                         default:
2009                                                 break;
2010                                 }
2011                         }
2012
2013                         if ($Blink && Strings::compareLink($Blink, DI::baseUrl() . "/profile/" . $importer["nickname"])) {
2014                                 $author = DBA::selectFirst('contact', ['name', 'thumb', 'url'], ['id' => $item['author-id']]);
2015
2016                                 $parent = Item::selectFirst(['id'], ['uri' => $item['parent-uri'], 'uid' => $importer["importer_uid"]]);
2017                                 $item['parent'] = $parent['id'];
2018
2019                                 // send a notification
2020                                 notification(
2021                                         [
2022                                         "type"         => Type::POKE,
2023                                         "notify_flags" => $importer["notify-flags"],
2024                                         "language"     => $importer["language"],
2025                                         "to_name"      => $importer["username"],
2026                                         "to_email"     => $importer["email"],
2027                                         "uid"          => $importer["importer_uid"],
2028                                         "item"         => $item,
2029                                         "link"         => DI::baseUrl()."/display/".urlencode($item['guid']),
2030                                         "source_name"  => $author["name"],
2031                                         "source_link"  => $author["url"],
2032                                         "source_photo" => $author["thumb"],
2033                                         "verb"         => $item["verb"],
2034                                         "otype"        => "person",
2035                                         "activity"     => $verb,
2036                                         "parent"       => $item['parent']]
2037                                 );
2038                         }
2039                 }
2040         }
2041
2042         /**
2043          * Processes several actions, depending on the verb
2044          *
2045          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2046          * @param array $importer  Record of the importer user mixed with contact of the content
2047          * @param array $item      the new item record
2048          * @param bool  $is_like   Is the verb a "like"?
2049          *
2050          * @return bool Should the processing of the entries be continued?
2051          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2052          * @todo  set proper type-hints (array?)
2053          */
2054         private static function processVerbs($entrytype, $importer, &$item, &$is_like)
2055         {
2056                 Logger::log("Process verb ".$item["verb"]." and object-type ".$item["object-type"]." for entrytype ".$entrytype, Logger::DEBUG);
2057
2058                 if (($entrytype == DFRN::TOP_LEVEL) && !empty($importer['id'])) {
2059                         // The filling of the the "contact" variable is done for legcy reasons
2060                         // The functions below are partly used by ostatus.php as well - where we have this variable
2061                         $contact = Contact::selectFirst([], ['id' => $importer['id']]);
2062
2063                         $activity = DI::activity();
2064
2065                         // Big question: Do we need these functions? They were part of the "consume_feed" function.
2066                         // This function once was responsible for DFRN and OStatus.
2067                         if ($activity->match($item["verb"], Activity::FOLLOW)) {
2068                                 Logger::log("New follower");
2069                                 Contact::addRelationship($importer, $contact, $item);
2070                                 return false;
2071                         }
2072                         if ($activity->match($item["verb"], Activity::UNFOLLOW)) {
2073                                 Logger::log("Lost follower");
2074                                 Contact::removeFollower($importer, $contact, $item);
2075                                 return false;
2076                         }
2077                         if ($activity->match($item["verb"], Activity::REQ_FRIEND)) {
2078                                 Logger::log("New friend request");
2079                                 Contact::addRelationship($importer, $contact, $item, true);
2080                                 return false;
2081                         }
2082                         if ($activity->match($item["verb"], Activity::UNFRIEND)) {
2083                                 Logger::log("Lost sharer");
2084                                 Contact::removeSharer($importer, $contact, $item);
2085                                 return false;
2086                         }
2087                 } else {
2088                         if (($item["verb"] == Activity::LIKE)
2089                                 || ($item["verb"] == Activity::DISLIKE)
2090                                 || ($item["verb"] == Activity::ATTEND)
2091                                 || ($item["verb"] == Activity::ATTENDNO)
2092                                 || ($item["verb"] == Activity::ATTENDMAYBE)
2093                                 || ($item["verb"] == Activity::ANNOUNCE)
2094                         ) {
2095                                 $is_like = true;
2096                                 $item["gravity"] = GRAVITY_ACTIVITY;
2097                                 // only one like or dislike per person
2098                                 // splitted into two queries for performance issues
2099                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2100                                         'verb' => $item["verb"], 'parent-uri' => $item["parent-uri"]];
2101                                 if (Item::exists($condition)) {
2102                                         return false;
2103                                 }
2104
2105                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2106                                         'verb' => $item["verb"], 'thr-parent' => $item["parent-uri"]];
2107                                 if (Item::exists($condition)) {
2108                                         return false;
2109                                 }
2110
2111                                 // The owner of an activity must be the author
2112                                 $item["owner-name"] = $item["author-name"];
2113                                 $item["owner-link"] = $item["author-link"];
2114                                 $item["owner-avatar"] = $item["author-avatar"];
2115                                 $item["owner-id"] = $item["author-id"];
2116                         } else {
2117                                 $is_like = false;
2118                         }
2119
2120                         if (($item["verb"] == Activity::TAG) && ($item["object-type"] == Activity\ObjectType::TAGTERM)) {
2121                                 $xo = XML::parseString($item["object"]);
2122                                 $xt = XML::parseString($item["target"]);
2123
2124                                 if ($xt->type == Activity\ObjectType::NOTE) {
2125                                         $item_tag = Item::selectFirst(['id', 'uri-id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
2126
2127                                         if (!DBA::isResult($item_tag)) {
2128                                                 Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2129                                                 return false;
2130                                         }
2131
2132                                         // extract tag, if not duplicate, add to parent item
2133                                         if ($xo->content) {
2134                                                 Tag::store($item_tag['uri-id'], Tag::HASHTAG, $xo->content);
2135                                         }
2136                                 }
2137                         }
2138                 }
2139                 return true;
2140         }
2141
2142         /**
2143          * Processes the link elements
2144          *
2145          * @param object $links link elements
2146          * @param array  $item  the item record
2147          * @return void
2148          * @todo set proper type-hints
2149          */
2150         private static function parseLinks($links, &$item)
2151         {
2152                 $rel = "";
2153                 $href = "";
2154                 $type = "";
2155                 $length = "0";
2156                 $title = "";
2157                 foreach ($links as $link) {
2158                         foreach ($link->attributes as $attributes) {
2159                                 switch ($attributes->name) {
2160                                         case "href"  : $href   = $attributes->textContent; break;
2161                                         case "rel"   : $rel    = $attributes->textContent; break;
2162                                         case "type"  : $type   = $attributes->textContent; break;
2163                                         case "length": $length = $attributes->textContent; break;
2164                                         case "title" : $title  = $attributes->textContent; break;
2165                                 }
2166                         }
2167                         if (($rel != "") && ($href != "")) {
2168                                 switch ($rel) {
2169                                         case "alternate":
2170                                                 $item["plink"] = $href;
2171                                                 break;
2172                                         case "enclosure":
2173                                                 if (!empty($item["attach"])) {
2174                                                         $item["attach"] .= ",";
2175                                                 } else {
2176                                                         $item["attach"] = "";
2177                                                 }
2178
2179                                                 $item["attach"] .= '[attach]href="' . $href . '" length="' . $length . '" type="' . $type . '" title="' . $title . '"[/attach]';
2180                                                 break;
2181                                 }
2182                         }
2183                 }
2184         }
2185
2186         /**
2187          * Checks if an incoming message is wanted
2188          *
2189          * @param array $item
2190          * @return boolean Is the message wanted?
2191          */
2192         private static function isSolicitedMessage(array $item)
2193         {
2194                 if (DBA::exists('contact', ["`nurl` = ? AND `uid` != ? AND `rel` IN (?, ?)",
2195                         Strings::normaliseLink($item["author-link"]), 0, Contact::FRIEND, Contact::SHARING])) {
2196                         Logger::info('Author has got followers - accepted', ['uri' => $item['uri'], 'author' => $item["author-link"]]);
2197                         return true;
2198                 }
2199
2200                 $taglist = Tag::getByURIId($item['uri-id'], [Tag::HASHTAG]);
2201                 $tags = array_column($taglist, 'name');
2202                 return Relay::isSolicitedPost($tags, $item['body'], $item['author-id'], $item['uri'], Protocol::DFRN);
2203         }
2204
2205         /**
2206          * Processes the entry elements which contain the items and comments
2207          *
2208          * @param array  $header   Array of the header elements that always stay the same
2209          * @param object $xpath    XPath object
2210          * @param object $entry    entry elements
2211          * @param array  $importer Record of the importer user mixed with contact of the content
2212          * @param string $xml      xml
2213          * @return void
2214          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2215          * @throws \ImagickException
2216          * @todo  Add type-hints
2217          */
2218         private static function processEntry($header, $xpath, $entry, $importer, $xml)
2219         {
2220                 Logger::log("Processing entries");
2221
2222                 $item = $header;
2223
2224                 $item["protocol"] = Conversation::PARCEL_DFRN;
2225
2226                 $item["source"] = $xml;
2227
2228                 // Get the uri
2229                 $item["uri"] = XML::getFirstNodeValue($xpath, "atom:id/text()", $entry);
2230
2231                 $item["edited"] = XML::getFirstNodeValue($xpath, "atom:updated/text()", $entry);
2232
2233                 $current = Item::selectFirst(['id', 'uid', 'edited', 'body'],
2234                         ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]]
2235                 );
2236                 // Is there an existing item?
2237                 if (DBA::isResult($current) && !self::isEditedTimestampNewer($current, $item)) {
2238                         Logger::log("Item ".$item["uri"]." (".$item['edited'].") already existed.", Logger::DEBUG);
2239                         return;
2240                 }
2241
2242                 // Fetch the owner
2243                 $owner = self::fetchauthor($xpath, $entry, $importer, "dfrn:owner", true, $xml);
2244
2245                 $owner_unknown = (isset($owner["contact-unknown"]) && $owner["contact-unknown"]);
2246
2247                 $item["owner-name"] = $owner["name"];
2248                 $item["owner-link"] = $owner["link"];
2249                 $item["owner-avatar"] = $owner["avatar"];
2250                 $item["owner-id"] = Contact::getIdForURL($owner["link"], 0);
2251
2252                 // fetch the author
2253                 $author = self::fetchauthor($xpath, $entry, $importer, "atom:author", true, $xml);
2254
2255                 $item["author-name"] = $author["name"];
2256                 $item["author-link"] = $author["link"];
2257                 $item["author-avatar"] = $author["avatar"];
2258                 $item["author-id"] = Contact::getIdForURL($author["link"], 0);
2259
2260                 $item["title"] = XML::getFirstNodeValue($xpath, "atom:title/text()", $entry);
2261
2262                 $item["created"] = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2263
2264                 $item["body"] = XML::getFirstNodeValue($xpath, "dfrn:env/text()", $entry);
2265                 $item["body"] = str_replace([' ',"\t","\r","\n"], ['','','',''], $item["body"]);
2266
2267                 $item["body"] = Strings::base64UrlDecode($item["body"]);
2268
2269                 $item["body"] = BBCode::limitBodySize($item["body"]);
2270
2271                 /// @todo We should check for a repeated post and if we know the repeated author.
2272
2273                 // We don't need the content element since "dfrn:env" is always present
2274                 //$item["body"] = $xpath->query("atom:content/text()", $entry)->item(0)->nodeValue;
2275
2276                 $item["location"] = XML::getFirstNodeValue($xpath, "dfrn:location/text()", $entry);
2277
2278                 $item["coord"] = XML::getFirstNodeValue($xpath, "georss:point", $entry);
2279
2280                 $item["private"] = XML::getFirstNodeValue($xpath, "dfrn:private/text()", $entry);
2281
2282                 $unlisted = XML::getFirstNodeValue($xpath, "dfrn:unlisted/text()", $entry);
2283                 if (!empty($unlisted) && ($item['private'] != Item::PRIVATE)) {
2284                         $item['private'] = Item::UNLISTED;
2285                 }
2286
2287                 $item["extid"] = XML::getFirstNodeValue($xpath, "dfrn:extid/text()", $entry);
2288
2289                 if (XML::getFirstNodeValue($xpath, "dfrn:bookmark/text()", $entry) == "true") {
2290                         $item["post-type"] = Item::PT_PAGE;
2291                 }
2292
2293                 $notice_info = $xpath->query("statusnet:notice_info", $entry);
2294                 if ($notice_info && ($notice_info->length > 0)) {
2295                         foreach ($notice_info->item(0)->attributes as $attributes) {
2296                                 if ($attributes->name == "source") {
2297                                         $item["app"] = strip_tags($attributes->textContent);
2298                                 }
2299                         }
2300                 }
2301
2302                 $item["guid"] = XML::getFirstNodeValue($xpath, "dfrn:diaspora_guid/text()", $entry);
2303
2304                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
2305
2306                 Tag::storeFromBody($item['uri-id'], $item["body"]);
2307
2308                 // We store the data from "dfrn:diaspora_signature" in a different table, this is done in "Item::insert"
2309                 $dsprsig = XML::unescape(XML::getFirstNodeValue($xpath, "dfrn:diaspora_signature/text()", $entry));
2310                 if ($dsprsig != "") {
2311                         $signature = json_decode(base64_decode($dsprsig));
2312                         // We don't store the old style signatures anymore that also contained the "signature" and "signer"
2313                         if (!empty($signature->signed_text) && empty($signature->signature) && empty($signature->signer)) {
2314                                 $item["diaspora_signed_text"] = $signature->signed_text;
2315                         }
2316                 }
2317
2318                 $item["verb"] = XML::getFirstNodeValue($xpath, "activity:verb/text()", $entry);
2319
2320                 if (XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry) != "") {
2321                         $item["object-type"] = XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry);
2322                 }
2323
2324                 $object = $xpath->query("activity:object", $entry)->item(0);
2325                 $item["object"] = self::transformActivity($xpath, $object, "object");
2326
2327                 if (trim($item["object"]) != "") {
2328                         $r = XML::parseString($item["object"]);
2329                         if (isset($r->type)) {
2330                                 $item["object-type"] = $r->type;
2331                         }
2332                 }
2333
2334                 $target = $xpath->query("activity:target", $entry)->item(0);
2335                 $item["target"] = self::transformActivity($xpath, $target, "target");
2336
2337                 $categories = $xpath->query("atom:category", $entry);
2338                 if ($categories) {
2339                         foreach ($categories as $category) {
2340                                 $term = "";
2341                                 $scheme = "";
2342                                 foreach ($category->attributes as $attributes) {
2343                                         if ($attributes->name == "term") {
2344                                                 $term = $attributes->textContent;
2345                                         }
2346
2347                                         if ($attributes->name == "scheme") {
2348                                                 $scheme = $attributes->textContent;
2349                                         }
2350                                 }
2351
2352                                 if (($term != "") && ($scheme != "")) {
2353                                         $parts = explode(":", $scheme);
2354                                         if ((count($parts) >= 4) && (array_shift($parts) == "X-DFRN")) {
2355                                                 $termurl = array_pop($parts);
2356                                                 $termurl = array_pop($parts) . ':' . $termurl;
2357                                                 Tag::store($item['uri-id'], Tag::IMPLICIT_MENTION, $term, $termurl);
2358                                         }
2359                                 }
2360                         }
2361                 }
2362
2363                 $links = $xpath->query("atom:link", $entry);
2364                 if ($links) {
2365                         self::parseLinks($links, $item);
2366                 }
2367
2368                 $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
2369
2370                 $conv = $xpath->query('ostatus:conversation', $entry);
2371                 if (is_object($conv->item(0))) {
2372                         foreach ($conv->item(0)->attributes as $attributes) {
2373                                 if ($attributes->name == "ref") {
2374                                         $item['conversation-uri'] = $attributes->textContent;
2375                                 }
2376                                 if ($attributes->name == "href") {
2377                                         $item['conversation-href'] = $attributes->textContent;
2378                                 }
2379                         }
2380                 }
2381
2382                 // Is it a reply or a top level posting?
2383                 $item["parent-uri"] = $item["uri"];
2384
2385                 $inreplyto = $xpath->query("thr:in-reply-to", $entry);
2386                 if (is_object($inreplyto->item(0))) {
2387                         foreach ($inreplyto->item(0)->attributes as $attributes) {
2388                                 if ($attributes->name == "ref") {
2389                                         $item["parent-uri"] = $attributes->textContent;
2390                                 }
2391                         }
2392                 }
2393
2394                 // Check if the message is wanted
2395                 if (($importer["importer_uid"] == 0) && ($item['uri'] == $item['parent-uri'])) {
2396                         if (!self::isSolicitedMessage($item)) {
2397                                 DBA::delete('item-uri', ['uri' => $item['uri']]);
2398                                 return 403;
2399                         }
2400                 }
2401
2402                 // Get the type of the item (Top level post, reply or remote reply)
2403                 $entrytype = self::getEntryType($importer, $item);
2404
2405                 // Now assign the rest of the values that depend on the type of the message
2406                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2407                         if (!isset($item["object-type"])) {
2408                                 $item["object-type"] = Activity\ObjectType::COMMENT;
2409                         }
2410
2411                         if ($item["contact-id"] != $owner["contact-id"]) {
2412                                 $item["contact-id"] = $owner["contact-id"];
2413                         }
2414
2415                         if (($item["network"] != $owner["network"]) && ($owner["network"] != "")) {
2416                                 $item["network"] = $owner["network"];
2417                         }
2418
2419                         if ($item["contact-id"] != $author["contact-id"]) {
2420                                 $item["contact-id"] = $author["contact-id"];
2421                         }
2422
2423                         if (($item["network"] != $author["network"]) && ($author["network"] != "")) {
2424                                 $item["network"] = $author["network"];
2425                         }
2426                 }
2427
2428                 // Ensure to have the correct share data
2429                 $item = Item::addShareDataFromOriginal($item);
2430
2431                 if ($entrytype == DFRN::REPLY_RC) {
2432                         $item["wall"] = 1;
2433                 } elseif ($entrytype == DFRN::TOP_LEVEL) {
2434                         if (!isset($item["object-type"])) {
2435                                 $item["object-type"] = Activity\ObjectType::NOTE;
2436                         }
2437
2438                         // Is it an event?
2439                         if (($item["object-type"] == Activity\ObjectType::EVENT) && !$owner_unknown) {
2440                                 Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
2441                                 $ev = Event::fromBBCode($item["body"]);
2442                                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
2443                                         Logger::log("Event in item ".$item["uri"]." was found.", Logger::DEBUG);
2444                                         $ev["cid"]     = $importer["id"];
2445                                         $ev["uid"]     = $importer["importer_uid"];
2446                                         $ev["uri"]     = $item["uri"];
2447                                         $ev["edited"]  = $item["edited"];
2448                                         $ev["private"] = $item["private"];
2449                                         $ev["guid"]    = $item["guid"];
2450                                         $ev["plink"]   = $item["plink"];
2451
2452                                         $condition = ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]];
2453                                         $event = DBA::selectFirst('event', ['id'], $condition);
2454                                         if (DBA::isResult($event)) {
2455                                                 $ev["id"] = $event["id"];
2456                                         }
2457
2458                                         $event_id = Event::store($ev);
2459                                         Logger::log("Event ".$event_id." was stored", Logger::DEBUG);
2460                                         return;
2461                                 }
2462                         }
2463                 }
2464
2465                 if (!self::processVerbs($entrytype, $importer, $item, $is_like)) {
2466                         Logger::log("Exiting because 'processVerbs' told us so", Logger::DEBUG);
2467                         return;
2468                 }
2469
2470                 // This check is done here to be able to receive connection requests in "processVerbs"
2471                 if (($entrytype == DFRN::TOP_LEVEL) && $owner_unknown) {
2472                         Logger::log("Item won't be stored because user " . $importer["importer_uid"] . " doesn't follow " . $item["owner-link"] . ".", Logger::DEBUG);
2473                         return;
2474                 }
2475
2476
2477                 // Update content if 'updated' changes
2478                 if (DBA::isResult($current)) {
2479                         if (self::updateContent($current, $item, $importer, $entrytype)) {
2480                                 Logger::log("Item ".$item["uri"]." was updated.", Logger::DEBUG);
2481                         } else {
2482                                 Logger::log("Item " . $item["uri"] . " already existed.", Logger::DEBUG);
2483                         }
2484                         return;
2485                 }
2486
2487                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2488                         // Will be overwritten for sharing accounts in Item::insert
2489                         if (empty($item['post-type']) && ($entrytype == DFRN::REPLY)) {
2490                                 $item['post-type'] = Item::PT_COMMENT;
2491                         }
2492
2493                         $posted_id = Item::insert($item);
2494                         if ($posted_id) {
2495                                 Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
2496
2497                                 if ($item['uid'] == 0) {
2498                                         Item::distribute($posted_id);
2499                                 }
2500
2501                                 return true;
2502                         }
2503                 } else { // $entrytype == DFRN::TOP_LEVEL
2504                         if (($importer["uid"] == 0) && ($importer["importer_uid"] != 0)) {
2505                                 Logger::log("Contact ".$importer["id"]." isn't known to user ".$importer["importer_uid"].". The post will be ignored.", Logger::DEBUG);
2506                                 return;
2507                         }
2508                         if (!Strings::compareLink($item["owner-link"], $importer["url"])) {
2509                                 /*
2510                                  * The item owner info is not our contact. It's OK and is to be expected if this is a tgroup delivery,
2511                                  * but otherwise there's a possible data mixup on the sender's system.
2512                                  * the tgroup delivery code called from Item::insert will correct it if it's a forum,
2513                                  * but we're going to unconditionally correct it here so that the post will always be owned by our contact.
2514                                  */
2515                                 Logger::log('Correcting item owner.', Logger::DEBUG);
2516                                 $item["owner-link"] = $importer["url"];
2517                                 $item["owner-id"] = Contact::getIdForURL($importer["url"], 0);
2518                         }
2519
2520                         if (($importer["rel"] == Contact::FOLLOWER) && (!self::tgroupCheck($importer["importer_uid"], $item))) {
2521                                 Logger::log("Contact ".$importer["id"]." is only follower and tgroup check was negative.", Logger::DEBUG);
2522                                 return;
2523                         }
2524
2525                         // This is my contact on another system, but it's really me.
2526                         // Turn this into a wall post.
2527                         $notify = Item::isRemoteSelf($importer, $item);
2528
2529                         $posted_id = Item::insert($item, $notify);
2530
2531                         if ($notify) {
2532                                 $posted_id = $notify;
2533                         }
2534
2535                         Logger::log("Item was stored with id ".$posted_id, Logger::DEBUG);
2536
2537                         if ($item['uid'] == 0) {
2538                                 Item::distribute($posted_id);
2539                         }
2540
2541                         if (stristr($item["verb"], Activity::POKE)) {
2542                                 $item['id'] = $posted_id;
2543                                 self::doPoke($item, $importer);
2544                         }
2545                 }
2546         }
2547
2548         /**
2549          * Deletes items
2550          *
2551          * @param object $xpath    XPath object
2552          * @param object $deletion deletion elements
2553          * @param array  $importer Record of the importer user mixed with contact of the content
2554          * @return void
2555          * @throws \Exception
2556          * @todo  set proper type-hints
2557          */
2558         private static function processDeletion($xpath, $deletion, $importer)
2559         {
2560                 Logger::log("Processing deletions");
2561                 $uri = null;
2562
2563                 foreach ($deletion->attributes as $attributes) {
2564                         if ($attributes->name == "ref") {
2565                                 $uri = $attributes->textContent;
2566                         }
2567                 }
2568
2569                 if (!$uri || !$importer["id"]) {
2570                         return false;
2571                 }
2572
2573                 $condition = ['uri' => $uri, 'uid' => $importer["importer_uid"]];
2574                 $item = Item::selectFirst(['id', 'parent', 'contact-id', 'file', 'deleted', 'gravity'], $condition);
2575                 if (!DBA::isResult($item)) {
2576                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " wasn't found.", Logger::DEBUG);
2577                         return;
2578                 }
2579
2580                 if (strstr($item['file'], '[')) {
2581                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " is filed. So it won't be deleted.", Logger::DEBUG);
2582                         return;
2583                 }
2584
2585                 // When it is a starting post it has to belong to the person that wants to delete it
2586                 if (($item['gravity'] == GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2587                         Logger::log("Item with uri " . $uri . " don't belong to contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2588                         return;
2589                 }
2590
2591                 // Comments can be deleted by the thread owner or comment owner
2592                 if (($item['gravity'] != GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2593                         $condition = ['id' => $item['parent'], 'contact-id' => $importer["id"]];
2594                         if (!Item::exists($condition)) {
2595                                 Logger::log("Item with uri " . $uri . " wasn't found or mustn't be deleted by contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2596                                 return;
2597                         }
2598                 }
2599
2600                 if ($item["deleted"]) {
2601                         return;
2602                 }
2603
2604                 Logger::log('deleting item '.$item['id'].' uri='.$uri, Logger::DEBUG);
2605
2606                 Item::markForDeletion(['id' => $item['id']]);
2607         }
2608
2609         /**
2610          * Imports a DFRN message
2611          *
2612          * @param string $xml          The DFRN message
2613          * @param array  $importer     Record of the importer user mixed with contact of the content
2614          * @param bool   $sort_by_date Is used when feeds are polled
2615          * @return integer Import status
2616          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2617          * @throws \ImagickException
2618          * @todo  set proper type-hints
2619          */
2620         public static function import($xml, $importer, $sort_by_date = false)
2621         {
2622                 if ($xml == "") {
2623                         return 400;
2624                 }
2625
2626                 $doc = new DOMDocument();
2627                 @$doc->loadXML($xml);
2628
2629                 $xpath = new DOMXPath($doc);
2630                 $xpath->registerNamespace("atom", ActivityNamespace::ATOM1);
2631                 $xpath->registerNamespace("thr", ActivityNamespace::THREAD);
2632                 $xpath->registerNamespace("at", ActivityNamespace::TOMB);
2633                 $xpath->registerNamespace("media", ActivityNamespace::MEDIA);
2634                 $xpath->registerNamespace("dfrn", ActivityNamespace::DFRN);
2635                 $xpath->registerNamespace("activity", ActivityNamespace::ACTIVITY);
2636                 $xpath->registerNamespace("georss", ActivityNamespace::GEORSS);
2637                 $xpath->registerNamespace("poco", ActivityNamespace::POCO);
2638                 $xpath->registerNamespace("ostatus", ActivityNamespace::OSTATUS);
2639                 $xpath->registerNamespace("statusnet", ActivityNamespace::STATUSNET);
2640
2641                 $header = [];
2642                 $header["uid"] = $importer["importer_uid"];
2643                 $header["network"] = Protocol::DFRN;
2644                 $header["wall"] = 0;
2645                 $header["origin"] = 0;
2646                 $header["contact-id"] = $importer["id"];
2647
2648                 // Update the contact table if the data has changed
2649
2650                 // The "atom:author" is only present in feeds
2651                 if ($xpath->query("/atom:feed/atom:author")->length > 0) {
2652                         self::fetchauthor($xpath, $doc->firstChild, $importer, "atom:author", false, $xml);
2653                 }
2654
2655                 // Only the "dfrn:owner" in the head section contains all data
2656                 if ($xpath->query("/atom:feed/dfrn:owner")->length > 0) {
2657                         self::fetchauthor($xpath, $doc->firstChild, $importer, "dfrn:owner", false, $xml);
2658                 }
2659
2660                 Logger::log("Import DFRN message for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2661
2662                 // is it a public forum? Private forums aren't exposed with this method
2663                 $forum = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:community/text()"));
2664
2665                 // The account type is new since 3.5.1
2666                 if ($xpath->query("/atom:feed/dfrn:account_type")->length > 0) {
2667                         // Hint: We are using separate update calls for uid=0 and uid!=0 since a combined call is bad for the database performance
2668
2669                         $accounttype = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:account_type/text()"));
2670
2671                         if ($accounttype != $importer["contact-type"]) {
2672                                 DBA::update('contact', ['contact-type' => $accounttype], ['id' => $importer['id']]);
2673
2674                                 // Updating the public contact as well
2675                                 DBA::update('contact', ['contact-type' => $accounttype], ['uid' => 0, 'nurl' => $importer['nurl']]);
2676                         }
2677                         // A forum contact can either have set "forum" or "prv" - but not both
2678                         if ($accounttype == User::ACCOUNT_TYPE_COMMUNITY) {
2679                                 // It's a forum, so either set the public or private forum flag
2680                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `id` = ?', $forum, !$forum, $importer['id']];
2681                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2682
2683                                 // Updating the public contact as well
2684                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `uid` = 0 AND `nurl` = ?', $forum, !$forum, $importer['nurl']];
2685                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2686                         } else {
2687                                 // It's not a forum, so remove the flags
2688                                 $condition = ['(`forum` OR `prv`) AND `id` = ?', $importer['id']];
2689                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2690
2691                                 // Updating the public contact as well
2692                                 $condition = ['(`forum` OR `prv`) AND `uid` = 0 AND `nurl` = ?', $importer['nurl']];
2693                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2694                         }
2695                 } elseif ($forum != $importer["forum"]) { // Deprecated since 3.5.1
2696                         $condition = ['`forum` != ? AND `id` = ?', $forum, $importer["id"]];
2697                         DBA::update('contact', ['forum' => $forum], $condition);
2698
2699                         // Updating the public contact as well
2700                         $condition = ['`forum` != ? AND `uid` = 0 AND `nurl` = ?', $forum, $importer['nurl']];
2701                         DBA::update('contact', ['forum' => $forum], $condition);
2702                 }
2703
2704
2705                 // We are processing relocations even if we are ignoring a contact
2706                 $relocations = $xpath->query("/atom:feed/dfrn:relocate");
2707                 foreach ($relocations as $relocation) {
2708                         self::processRelocation($xpath, $relocation, $importer);
2709                 }
2710
2711                 if (($importer["uid"] != 0) && !$importer["readonly"]) {
2712                         $mails = $xpath->query("/atom:feed/dfrn:mail");
2713                         foreach ($mails as $mail) {
2714                                 self::processMail($xpath, $mail, $importer);
2715                         }
2716
2717                         $suggestions = $xpath->query("/atom:feed/dfrn:suggest");
2718                         foreach ($suggestions as $suggestion) {
2719                                 self::processSuggestion($xpath, $suggestion, $importer);
2720                         }
2721                 }
2722
2723                 $deletions = $xpath->query("/atom:feed/at:deleted-entry");
2724                 foreach ($deletions as $deletion) {
2725                         self::processDeletion($xpath, $deletion, $importer);
2726                 }
2727
2728                 if (!$sort_by_date) {
2729                         $entries = $xpath->query("/atom:feed/atom:entry");
2730                         foreach ($entries as $entry) {
2731                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2732                         }
2733                 } else {
2734                         $newentries = [];
2735                         $entries = $xpath->query("/atom:feed/atom:entry");
2736                         foreach ($entries as $entry) {
2737                                 $created = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2738                                 $newentries[strtotime($created)] = $entry;
2739                         }
2740
2741                         // Now sort after the publishing date
2742                         ksort($newentries);
2743
2744                         foreach ($newentries as $entry) {
2745                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2746                         }
2747                 }
2748                 Logger::log("Import done for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2749                 return 200;
2750         }
2751
2752         /**
2753          * Returns the activity verb
2754          *
2755          * @param array $item Item array
2756          *
2757          * @return string activity verb
2758          */
2759         private static function constructVerb(array $item)
2760         {
2761                 if ($item['verb']) {
2762                         return $item['verb'];
2763                 }
2764                 return Activity::POST;
2765         }
2766
2767         private static function tgroupCheck($uid, $item)
2768         {
2769                 $mention = false;
2770
2771                 // check that the message originated elsewhere and is a top-level post
2772
2773                 if ($item['wall'] || $item['origin'] || ($item['uri'] != $item['parent-uri'])) {
2774                         return false;
2775                 }
2776
2777                 $user = DBA::selectFirst('user', ['page-flags', 'nickname'], ['uid' => $uid]);
2778                 if (!DBA::isResult($user)) {
2779                         return false;
2780                 }
2781
2782                 $community_page = ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY);
2783                 $prvgroup = ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP);
2784
2785                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
2786
2787                 /*
2788                  * Diaspora uses their own hardwired link URL in @-tags
2789                  * instead of the one we supply with webfinger
2790                  */
2791                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
2792
2793                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2794                 if ($cnt) {
2795                         foreach ($matches as $mtch) {
2796                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2797                                         $mention = true;
2798                                         Logger::log('mention found: ' . $mtch[2]);
2799                                 }
2800                         }
2801                 }
2802
2803                 if (!$mention) {
2804                         return false;
2805                 }
2806
2807                 return $community_page || $prvgroup;
2808         }
2809
2810         /**
2811          * This function returns true if $update has an edited timestamp newer
2812          * than $existing, i.e. $update contains new data which should override
2813          * what's already there.  If there is no timestamp yet, the update is
2814          * assumed to be newer.  If the update has no timestamp, the existing
2815          * item is assumed to be up-to-date.  If the timestamps are equal it
2816          * assumes the update has been seen before and should be ignored.
2817          *
2818          * @param $existing
2819          * @param $update
2820          * @return bool
2821          * @throws \Exception
2822          */
2823         private static function isEditedTimestampNewer($existing, $update)
2824         {
2825                 if (empty($existing['edited'])) {
2826                         return true;
2827                 }
2828                 if (empty($update['edited'])) {
2829                         return false;
2830                 }
2831
2832                 $existing_edited = DateTimeFormat::utc($existing['edited']);
2833                 $update_edited = DateTimeFormat::utc($update['edited']);
2834
2835                 return (strcmp($existing_edited, $update_edited) < 0);
2836         }
2837
2838         /**
2839          * Checks if the given contact url does support DFRN
2840          *
2841          * @param string  $url    profile url
2842          * @return boolean
2843          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2844          * @throws \ImagickException
2845          */
2846         public static function isSupportedByContactUrl($url)
2847         {
2848                 $probe = Probe::uri($url, Protocol::DFRN);
2849                 return $probe['network'] == Protocol::DFRN;
2850         }
2851 }