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;
  43 use Friendica\Model\Post\Category;
  44 use Friendica\Model\Profile;
  45 use Friendica\Model\Tag;
  46 use Friendica\Model\User;
  47 use Friendica\Model\Verb;
  48 use Friendica\Network\Probe;
  49 use Friendica\Util\Crypto;
  50 use Friendica\Util\DateTimeFormat;
  51 use Friendica\Util\Images;
  52 use Friendica\Util\Network;
  53 use Friendica\Util\Strings;
  54 use Friendica\Util\XML;
  55
  56 /**
  57  * This class contain functions to create and send DFRN XML files
  58  */
  59 class DFRN
  60 {
  61
  62         const TOP_LEVEL = 0;    // Top level posting
  63         const REPLY = 1;                // Regular reply that is stored locally
  64         const REPLY_RC = 2;     // Reply that will be relayed
  65
  66         /**
  67          * Generates an array of contact and user for DFRN imports
  68          *
  69          * This array contains not only the receiver but also the sender of the message.
  70          *
  71          * @param integer $cid Contact id
  72          * @param integer $uid User id
  73          *
  74          * @return array importer
  75          * @throws \Exception
  76          */
  77         public static function getImporter($cid, $uid = 0)
  78         {
  79                 $condition = ['id' => $cid, 'blocked' => false, 'pending' => false];
  80                 $contact = DBA::selectFirst('contact', [], $condition);
  81                 if (!DBA::isResult($contact)) {
  82                         return [];
  83                 }
  84
  85                 $contact['cpubkey'] = $contact['pubkey'];
  86                 $contact['cprvkey'] = $contact['prvkey'];
  87                 $contact['senderName'] = $contact['name'];
  88
  89                 if ($uid != 0) {
  90                         $condition = ['uid' => $uid, 'account_expired' => false, 'account_removed' => false];
  91                         $user = DBA::selectFirst('user', [], $condition);
  92                         if (!DBA::isResult($user)) {
  93                                 return [];
  94                         }
  95
  96                         $user['importer_uid'] = $user['uid'];
  97                         $user['uprvkey'] = $user['prvkey'];
  98                 } else {
  99                         $user = ['importer_uid' => 0, 'uprvkey' => '', 'timezone' => 'UTC',
 100                                 'nickname' => '', 'sprvkey' => '', 'spubkey' => '',
 101                                 'page-flags' => 0, 'account-type' => 0, 'prvnets' => 0];
 102                 }
 103
 104                 return array_merge($contact, $user);
 105         }
 106
 107         /**
 108          * Generates the atom entries for delivery.php
 109          *
 110          * This function is used whenever content is transmitted via DFRN.
 111          *
 112          * @param array $items Item elements
 113          * @param array $owner Owner record
 114          *
 115          * @return string DFRN entries
 116          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 117          * @throws \ImagickException
 118          * @todo  Find proper type-hints
 119          */
 120         public static function entries($items, $owner)
 121         {
 122                 $doc = new DOMDocument('1.0', 'utf-8');
 123                 $doc->formatOutput = true;
 124
 125                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 126
 127                 if (! count($items)) {
 128                         return trim($doc->saveXML());
 129                 }
 130
 131                 foreach ($items as $item) {
 132                         // These values aren't sent when sending from the queue.
 133                         /// @todo Check if we can set these values from the queue or if they are needed at all.
 134                         $item["entry:comment-allow"] = ($item["entry:comment-allow"] ?? '') ?: true;
 135                         $item["entry:cid"] = $item["entry:cid"] ?? 0;
 136
 137                         $entry = self::entry($doc, "text", $item, $owner, $item["entry:comment-allow"], $item["entry:cid"]);
 138                         if (isset($entry)) {
 139                                 $root->appendChild($entry);
 140                         }
 141                 }
 142
 143                 return trim($doc->saveXML());
 144         }
 145
 146         /**
 147          * Generate an atom feed for the given user
 148          *
 149          * This function is called when another server is pulling data from the user feed.
 150          *
 151          * @param string  $dfrn_id     DFRN ID from the requesting party
 152          * @param string  $owner_nick  Owner nick name
 153          * @param string  $last_update Date of the last update
 154          * @param int     $direction   Can be -1, 0 or 1.
 155          * @param boolean $onlyheader  Output only the header without content? (Default is "no")
 156          *
 157          * @return string DFRN feed entries
 158          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 159          * @throws \ImagickException
 160          */
 161         public static function feed($dfrn_id, $owner_nick, $last_update, $direction = 0, $onlyheader = false)
 162         {
 163                 $a = DI::app();
 164
 165                 $sitefeed    = ((strlen($owner_nick)) ? false : true); // not yet implemented, need to rewrite huge chunks of following logic
 166                 $public_feed = (($dfrn_id) ? false : true);
 167                 $starred     = false;   // not yet implemented, possible security issues
 168                 $converse    = false;
 169
 170                 if ($public_feed && $a->argc > 2) {
 171                         for ($x = 2; $x < $a->argc; $x++) {
 172                                 if ($a->argv[$x] == 'converse') {
 173                                         $converse = true;
 174                                 }
 175                                 if ($a->argv[$x] == 'starred') {
 176                                         $starred = true;
 177                                 }
 178                                 if ($a->argv[$x] == 'category' && $a->argc > ($x + 1) && strlen($a->argv[$x+1])) {
 179                                         $category = $a->argv[$x+1];
 180                                 }
 181                         }
 182                 }
 183
 184                 // default permissions - anonymous user
 185
 186                 $sql_extra = sprintf(" AND `item`.`private` != %s ", Item::PRIVATE);
 187
 188                 $owner = DBA::selectFirst('owner-view', [], ['nickname' => $owner_nick]);
 189                 if (!DBA::isResult($owner)) {
 190                         Logger::log(sprintf('No contact found for nickname=%d', $owner_nick), Logger::WARNING);
 191                         exit();
 192                 }
 193
 194                 $owner_id = $owner['uid'];
 195
 196                 $sql_post_table = "";
 197
 198                 if (! $public_feed) {
 199                         switch ($direction) {
 200                                 case (-1):
 201                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 202                                         break;
 203                                 case 0:
 204                                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 205                                         break;
 206                                 case 1:
 207                                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 208                                         break;
 209                                 default:
 210                                         return false;
 211                                         break; // NOTREACHED
 212                         }
 213
 214                         $r = q(
 215                                 "SELECT * FROM `contact` WHERE NOT `blocked` AND `contact`.`uid` = %d $sql_extra LIMIT 1",
 216                                 intval($owner_id)
 217                         );
 218
 219                         if (! DBA::isResult($r)) {
 220                                 Logger::log(sprintf('No contact found for uid=%d', $owner_id), Logger::WARNING);
 221                                 exit();
 222                         }
 223
 224                         $contact = $r[0];
 225
 226                         $set = PermissionSet::get($owner_id, $contact['id']);
 227
 228                         if (!empty($set)) {
 229                                 $sql_extra = " AND `item`.`psid` IN (" . implode(',', $set) .")";
 230                         } else {
 231                                 $sql_extra = sprintf(" AND `item`.`private` != %s", Item::PRIVATE);
 232                         }
 233                 }
 234
 235                 if ($public_feed) {
 236                         $sort = 'DESC';
 237                 } else {
 238                         $sort = 'ASC';
 239                 }
 240
 241                 if (! strlen($last_update)) {
 242                         $last_update = 'now -30 days';
 243                 }
 244
 245                 if (isset($category)) {
 246                         $sql_post_table = sprintf("INNER JOIN (SELECT `uri-id` FROM `category-view` WHERE `name` = '%s' AND `type` = %d AND `uid` = %d ORDER BY `uri-id` DESC) AS `category` ON `item`.`uri-id` = `category`.`uri-id` ",
 247                                 DBA::escape(Strings::protectSprintf($category)), intval(Category::CATEGORY), intval($owner_id));
 248                 }
 249
 250                 if ($public_feed && ! $converse) {
 251                         $sql_extra .= " AND `contact`.`self` = 1 ";
 252                 }
 253
 254                 $check_date = DateTimeFormat::utc($last_update);
 255
 256                 $r = q(
 257                         "SELECT `item`.`id`
 258                         FROM `item` USE INDEX (`uid_wall_changed`) $sql_post_table
 259                         STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
 260                         WHERE `item`.`uid` = %d AND `item`.`wall` AND `item`.`changed` > '%s'
 261                         AND `vid` != %d AND `item`.`visible` $sql_extra
 262                         ORDER BY `item`.`parent` ".$sort.", `item`.`received` ASC LIMIT 0, 300",
 263                         intval($owner_id),
 264                         DBA::escape($check_date),
 265                         Verb::getID(Activity::ANNOUNCE),
 266                         DBA::escape($sort)
 267                 );
 268
 269                 $ids = [];
 270                 foreach ($r as $item) {
 271                         $ids[] = $item['id'];
 272                 }
 273
 274                 if (!empty($ids)) {
 275                         $ret = Item::select(Item::DELIVER_FIELDLIST, ['id' => $ids]);
 276                         $items = Item::inArray($ret);
 277                 } else {
 278                         $items = [];
 279                 }
 280
 281                 /*
 282                  * Will check further below if this actually returned results.
 283                  * We will provide an empty feed if that is the case.
 284                  */
 285
 286                 $doc = new DOMDocument('1.0', 'utf-8');
 287                 $doc->formatOutput = true;
 288
 289                 $alternatelink = $owner['url'];
 290
 291                 if (isset($category)) {
 292                         $alternatelink .= "/category/".$category;
 293                 }
 294
 295                 if ($public_feed) {
 296                         $author = "dfrn:owner";
 297                 } else {
 298                         $author = "author";
 299                 }
 300
 301                 $root = self::addHeader($doc, $owner, $author, $alternatelink, true);
 302
 303                 /// @TODO This hook can't work anymore
 304                 //      \Friendica\Core\Hook::callAll('atom_feed', $atom);
 305
 306                 if (!DBA::isResult($items) || $onlyheader) {
 307                         $atom = trim($doc->saveXML());
 308
 309                         Hook::callAll('atom_feed_end', $atom);
 310
 311                         return $atom;
 312                 }
 313
 314                 foreach ($items as $item) {
 315                         // prevent private email from leaking.
 316                         if ($item['network'] == Protocol::MAIL) {
 317                                 continue;
 318                         }
 319
 320                         // public feeds get html, our own nodes use bbcode
 321
 322                         if ($public_feed) {
 323                                 $type = 'html';
 324                                 // catch any email that's in a public conversation and make sure it doesn't leak
 325                                 if ($item['private'] == Item::PRIVATE) {
 326                                         continue;
 327                                 }
 328                         } else {
 329                                 $type = 'text';
 330                         }
 331
 332                         $entry = self::entry($doc, $type, $item, $owner, true);
 333                         if (isset($entry)) {
 334                                 $root->appendChild($entry);
 335                         }
 336                 }
 337
 338                 $atom = trim($doc->saveXML());
 339
 340                 Hook::callAll('atom_feed_end', $atom);
 341
 342                 return $atom;
 343         }
 344
 345         /**
 346          * Generate an atom entry for a given item id
 347          *
 348          * @param int     $item_id      The item id
 349          * @param boolean $conversation Show the conversation. If false show the single post.
 350          *
 351          * @return string DFRN feed entry
 352          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 353          * @throws \ImagickException
 354          */
 355         public static function itemFeed($item_id, $conversation = false)
 356         {
 357                 if ($conversation) {
 358                         $condition = ['parent' => $item_id];
 359                 } else {
 360                         $condition = ['id' => $item_id];
 361                 }
 362
 363                 $ret = Item::select(Item::DELIVER_FIELDLIST, $condition);
 364                 $items = Item::inArray($ret);
 365                 if (!DBA::isResult($items)) {
 366                         return '';
 367                 }
 368
 369                 $item = $items[0];
 370
 371                 if ($item['uid'] != 0) {
 372                         $owner = User::getOwnerDataById($item['uid']);
 373                         if (!$owner) {
 374                                 return '';
 375                         }
 376                 } else {
 377                         $owner = ['uid' => 0, 'nick' => 'feed-item'];
 378                 }
 379
 380                 $doc = new DOMDocument('1.0', 'utf-8');
 381                 $doc->formatOutput = true;
 382                 $type = 'html';
 383
 384                 if ($conversation) {
 385                         $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 386                         $doc->appendChild($root);
 387
 388                         $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 389                         $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 390                         $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 391                         $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 392                         $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 393                         $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 394                         $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 395                         $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 396                         $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 397
 398                         //$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 399
 400                         foreach ($items as $item) {
 401                                 $entry = self::entry($doc, $type, $item, $owner, true, 0);
 402                                 if (isset($entry)) {
 403                                         $root->appendChild($entry);
 404                                 }
 405                         }
 406                 } else {
 407                         self::entry($doc, $type, $item, $owner, true, 0, true);
 408                 }
 409
 410                 $atom = trim($doc->saveXML());
 411                 return $atom;
 412         }
 413
 414         /**
 415          * Create XML text for DFRN mails
 416          *
 417          * @param array $item  message elements
 418          * @param array $owner Owner record
 419          *
 420          * @return string DFRN mail
 421          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 422          * @todo  Find proper type-hints
 423          */
 424         public static function mail($item, $owner)
 425         {
 426                 $doc = new DOMDocument('1.0', 'utf-8');
 427                 $doc->formatOutput = true;
 428
 429                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 430
 431                 $mail = $doc->createElement("dfrn:mail");
 432                 $sender = $doc->createElement("dfrn:sender");
 433
 434                 XML::addElement($doc, $sender, "dfrn:name", $owner['name']);
 435                 XML::addElement($doc, $sender, "dfrn:uri", $owner['url']);
 436                 XML::addElement($doc, $sender, "dfrn:avatar", $owner['thumb']);
 437
 438                 $mail->appendChild($sender);
 439
 440                 XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 441                 XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
 442                 XML::addElement($doc, $mail, "dfrn:sentdate", DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
 443                 XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 444                 XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 445
 446                 $root->appendChild($mail);
 447
 448                 return trim($doc->saveXML());
 449         }
 450
 451         /**
 452          * Create XML text for DFRN friend suggestions
 453          *
 454          * @param array $item  suggestion elements
 455          * @param array $owner Owner record
 456          *
 457          * @return string DFRN suggestions
 458          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 459          * @todo  Find proper type-hints
 460          */
 461         public static function fsuggest($item, $owner)
 462         {
 463                 $doc = new DOMDocument('1.0', 'utf-8');
 464                 $doc->formatOutput = true;
 465
 466                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 467
 468                 $suggest = $doc->createElement("dfrn:suggest");
 469
 470                 XML::addElement($doc, $suggest, "dfrn:url", $item['url']);
 471                 XML::addElement($doc, $suggest, "dfrn:name", $item['name']);
 472                 XML::addElement($doc, $suggest, "dfrn:photo", $item['photo']);
 473                 XML::addElement($doc, $suggest, "dfrn:request", $item['request']);
 474                 XML::addElement($doc, $suggest, "dfrn:note", $item['note']);
 475
 476                 $root->appendChild($suggest);
 477
 478                 return trim($doc->saveXML());
 479         }
 480
 481         /**
 482          * Create XML text for DFRN relocations
 483          *
 484          * @param array $owner Owner record
 485          * @param int   $uid   User ID
 486          *
 487          * @return string DFRN relocations
 488          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 489          * @todo  Find proper type-hints
 490          */
 491         public static function relocate($owner, $uid)
 492         {
 493
 494                 /* get site pubkey. this could be a new installation with no site keys*/
 495                 $pubkey = DI::config()->get('system', 'site_pubkey');
 496                 if (! $pubkey) {
 497                         $res = Crypto::newKeypair(1024);
 498                         DI::config()->set('system', 'site_prvkey', $res['prvkey']);
 499                         DI::config()->set('system', 'site_pubkey', $res['pubkey']);
 500                 }
 501
 502                 $rp = q(
 503                         "SELECT `resource-id` , `scale`, type FROM `photo`
 504                                 WHERE `profile` = 1 AND `uid` = %d ORDER BY scale;",
 505                         $uid
 506                 );
 507                 $photos = [];
 508                 $ext = Images::supportedTypes();
 509
 510                 foreach ($rp as $p) {
 511                         $photos[$p['scale']] = DI::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
 512                 }
 513
 514
 515                 $doc = new DOMDocument('1.0', 'utf-8');
 516                 $doc->formatOutput = true;
 517
 518                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 519
 520                 $relocate = $doc->createElement("dfrn:relocate");
 521
 522                 XML::addElement($doc, $relocate, "dfrn:url", $owner['url']);
 523                 XML::addElement($doc, $relocate, "dfrn:name", $owner['name']);
 524                 XML::addElement($doc, $relocate, "dfrn:addr", $owner['addr']);
 525                 XML::addElement($doc, $relocate, "dfrn:avatar", $owner['avatar']);
 526                 XML::addElement($doc, $relocate, "dfrn:photo", $photos[4]);
 527                 XML::addElement($doc, $relocate, "dfrn:thumb", $photos[5]);
 528                 XML::addElement($doc, $relocate, "dfrn:micro", $photos[6]);
 529                 XML::addElement($doc, $relocate, "dfrn:request", $owner['request']);
 530                 XML::addElement($doc, $relocate, "dfrn:confirm", $owner['confirm']);
 531                 XML::addElement($doc, $relocate, "dfrn:notify", $owner['notify']);
 532                 XML::addElement($doc, $relocate, "dfrn:poll", $owner['poll']);
 533                 XML::addElement($doc, $relocate, "dfrn:sitepubkey", DI::config()->get('system', 'site_pubkey'));
 534
 535                 $root->appendChild($relocate);
 536
 537                 return trim($doc->saveXML());
 538         }
 539
 540         /**
 541          * Adds the header elements for the DFRN protocol
 542          *
 543          * @param DOMDocument $doc           XML document
 544          * @param array       $owner         Owner record
 545          * @param string      $authorelement Element name for the author
 546          * @param string      $alternatelink link to profile or category
 547          * @param bool        $public        Is it a header for public posts?
 548          *
 549          * @return object XML root object
 550          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 551          * @todo  Find proper type-hints
 552          */
 553         private static function addHeader(DOMDocument $doc, $owner, $authorelement, $alternatelink = "", $public = false)
 554         {
 555
 556                 if ($alternatelink == "") {
 557                         $alternatelink = $owner['url'];
 558                 }
 559
 560                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 561                 $doc->appendChild($root);
 562
 563                 $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 564                 $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 565                 $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 566                 $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 567                 $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 568                 $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 569                 $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 570                 $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 571                 $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 572
 573                 XML::addElement($doc, $root, "id", DI::baseUrl()."/profile/".$owner["nick"]);
 574                 XML::addElement($doc, $root, "title", $owner["name"]);
 575
 576                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION];
 577                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 578
 579                 $attributes = ["rel" => "license", "href" => "http://creativecommons.org/licenses/by/3.0/"];
 580                 XML::addElement($doc, $root, "link", "", $attributes);
 581
 582                 $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $alternatelink];
 583                 XML::addElement($doc, $root, "link", "", $attributes);
 584
 585
 586                 if ($public) {
 587                         // DFRN itself doesn't uses this. But maybe someone else wants to subscribe to the public feed.
 588                         OStatus::hublinks($doc, $root, $owner["nick"]);
 589
 590                         $attributes = ["rel" => "salmon", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 591                         XML::addElement($doc, $root, "link", "", $attributes);
 592
 593                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-replies", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 594                         XML::addElement($doc, $root, "link", "", $attributes);
 595
 596                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-mention", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 597                         XML::addElement($doc, $root, "link", "", $attributes);
 598                 }
 599
 600                 // For backward compatibility we keep this element
 601                 if ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
 602                         XML::addElement($doc, $root, "dfrn:community", 1);
 603                 }
 604
 605                 // The former element is replaced by this one
 606                 XML::addElement($doc, $root, "dfrn:account_type", $owner["account-type"]);
 607
 608                 /// @todo We need a way to transmit the different page flags like "User::PAGE_FLAGS_PRVGROUP"
 609
 610                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 611
 612                 $author = self::addAuthor($doc, $owner, $authorelement, $public);
 613                 $root->appendChild($author);
 614
 615                 return $root;
 616         }
 617
 618         /**
 619          * Adds the author element in the header for the DFRN protocol
 620          *
 621          * @param DOMDocument $doc           XML document
 622          * @param array       $owner         Owner record
 623          * @param string      $authorelement Element name for the author
 624          * @param boolean     $public        boolean
 625          *
 626          * @return \DOMElement XML author object
 627          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 628          * @todo  Find proper type-hints
 629          */
 630         private static function addAuthor(DOMDocument $doc, array $owner, $authorelement, $public)
 631         {
 632                 // Should the profile be "unsearchable" in the net? Then add the "hide" element
 633                 $hide = DBA::exists('profile', ['uid' => $owner['uid'], 'net-publish' => false]);
 634
 635                 $author = $doc->createElement($authorelement);
 636
 637                 $namdate = DateTimeFormat::utc($owner['name-date'].'+00:00', DateTimeFormat::ATOM);
 638                 $picdate = DateTimeFormat::utc($owner['avatar-date'].'+00:00', DateTimeFormat::ATOM);
 639
 640                 $attributes = [];
 641
 642                 if (!$public || !$hide) {
 643                         $attributes = ["dfrn:updated" => $namdate];
 644                 }
 645
 646                 XML::addElement($doc, $author, "name", $owner["name"], $attributes);
 647                 XML::addElement($doc, $author, "uri", DI::baseUrl().'/profile/'.$owner["nickname"], $attributes);
 648                 XML::addElement($doc, $author, "dfrn:handle", $owner["addr"], $attributes);
 649
 650                 $attributes = ["rel" => "photo", "type" => "image/jpeg",
 651                                         "media:width" => 300, "media:height" => 300, "href" => $owner['photo']];
 652
 653                 if (!$public || !$hide) {
 654                         $attributes["dfrn:updated"] = $picdate;
 655                 }
 656
 657                 XML::addElement($doc, $author, "link", "", $attributes);
 658
 659                 $attributes["rel"] = "avatar";
 660                 XML::addElement($doc, $author, "link", "", $attributes);
 661
 662                 if ($hide) {
 663                         XML::addElement($doc, $author, "dfrn:hide", "true");
 664                 }
 665
 666                 // The following fields will only be generated if the data isn't meant for a public feed
 667                 if ($public) {
 668                         return $author;
 669                 }
 670
 671                 $birthday = feed_birthday($owner['uid'], $owner['timezone']);
 672
 673                 if ($birthday) {
 674                         XML::addElement($doc, $author, "dfrn:birthday", $birthday);
 675                 }
 676
 677                 // Only show contact details when we are allowed to
 678                 $profile = DBA::selectFirst('owner-view',
 679                         ['about', 'name', 'homepage', 'nickname', 'timezone', 'locality', 'region', 'country-name', 'pub_keywords', 'xmpp', 'dob'],
 680                         ['uid' => $owner['uid'], 'hidewall' => false]);
 681                 if (DBA::isResult($profile)) {
 682                         XML::addElement($doc, $author, "poco:displayName", $profile["name"]);
 683                         XML::addElement($doc, $author, "poco:updated", $namdate);
 684
 685                         if (trim($profile["dob"]) > DBA::NULL_DATE) {
 686                                 XML::addElement($doc, $author, "poco:birthday", "0000-".date("m-d", strtotime($profile["dob"])));
 687                         }
 688
 689                         XML::addElement($doc, $author, "poco:note", $profile["about"]);
 690                         XML::addElement($doc, $author, "poco:preferredUsername", $profile["nickname"]);
 691
 692                         $savetz = date_default_timezone_get();
 693                         date_default_timezone_set($profile["timezone"]);
 694                         XML::addElement($doc, $author, "poco:utcOffset", date("P"));
 695                         date_default_timezone_set($savetz);
 696
 697                         if (trim($profile["homepage"]) != "") {
 698                                 $urls = $doc->createElement("poco:urls");
 699                                 XML::addElement($doc, $urls, "poco:type", "homepage");
 700                                 XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
 701                                 XML::addElement($doc, $urls, "poco:primary", "true");
 702                                 $author->appendChild($urls);
 703                         }
 704
 705                         if (trim($profile["pub_keywords"]) != "") {
 706                                 $keywords = explode(",", $profile["pub_keywords"]);
 707
 708                                 foreach ($keywords as $keyword) {
 709                                         XML::addElement($doc, $author, "poco:tags", trim($keyword));
 710                                 }
 711                         }
 712
 713                         if (trim($profile["xmpp"]) != "") {
 714                                 $ims = $doc->createElement("poco:ims");
 715                                 XML::addElement($doc, $ims, "poco:type", "xmpp");
 716                                 XML::addElement($doc, $ims, "poco:value", $profile["xmpp"]);
 717                                 XML::addElement($doc, $ims, "poco:primary", "true");
 718                                 $author->appendChild($ims);
 719                         }
 720
 721                         if (trim($profile["locality"].$profile["region"].$profile["country-name"]) != "") {
 722                                 $element = $doc->createElement("poco:address");
 723
 724                                 XML::addElement($doc, $element, "poco:formatted", Profile::formatLocation($profile));
 725
 726                                 if (trim($profile["locality"]) != "") {
 727                                         XML::addElement($doc, $element, "poco:locality", $profile["locality"]);
 728                                 }
 729
 730                                 if (trim($profile["region"]) != "") {
 731                                         XML::addElement($doc, $element, "poco:region", $profile["region"]);
 732                                 }
 733
 734                                 if (trim($profile["country-name"]) != "") {
 735                                         XML::addElement($doc, $element, "poco:country", $profile["country-name"]);
 736                                 }
 737
 738                                 $author->appendChild($element);
 739                         }
 740                 }
 741
 742                 return $author;
 743         }
 744
 745         /**
 746          * Adds the author elements in the "entry" elements of the DFRN protocol
 747          *
 748          * @param DOMDocument $doc         XML document
 749          * @param string $element     Element name for the author
 750          * @param string $contact_url Link of the contact
 751          * @param array  $item        Item elements
 752          *
 753          * @return \DOMElement XML author object
 754          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 755          * @todo  Find proper type-hints
 756          */
 757         private static function addEntryAuthor(DOMDocument $doc, $element, $contact_url, $item)
 758         {
 759                 $author = $doc->createElement($element);
 760
 761                 $contact = Contact::getByURLForUser($contact_url, $item["uid"], false, ['url', 'name', 'addr', 'photo']);
 762                 if (!empty($contact)) {
 763                         XML::addElement($doc, $author, "name", $contact["name"]);
 764                         XML::addElement($doc, $author, "uri", $contact["url"]);
 765                         XML::addElement($doc, $author, "dfrn:handle", $contact["addr"]);
 766
 767                         /// @Todo
 768                         /// - Check real image type and image size
 769                         /// - Check which of these boths elements we should use
 770                         $attributes = [
 771                                 "rel" => "photo",
 772                                 "type" => "image/jpeg",
 773                                 "media:width" => 80,
 774                                 "media:height" => 80,
 775                                 "href" => $contact["photo"]];
 776                         XML::addElement($doc, $author, "link", "", $attributes);
 777
 778                         $attributes = [
 779                                 "rel" => "avatar",
 780                                 "type" => "image/jpeg",
 781                                 "media:width" => 80,
 782                                 "media:height" => 80,
 783                                 "href" => $contact["photo"]];
 784                         XML::addElement($doc, $author, "link", "", $attributes);
 785                 }
 786
 787                 return $author;
 788         }
 789
 790         /**
 791          * Adds the activity elements
 792          *
 793          * @param DOMDocument $doc      XML document
 794          * @param string      $element  Element name for the activity
 795          * @param string      $activity activity value
 796          *
 797          * @return \DOMElement XML activity object
 798          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 799          * @todo  Find proper type-hints
 800          */
 801         private static function createActivity(DOMDocument $doc, $element, $activity)
 802         {
 803                 if ($activity) {
 804                         $entry = $doc->createElement($element);
 805
 806                         $r = XML::parseString($activity);
 807                         if (!$r) {
 808                                 return false;
 809                         }
 810
 811                         if ($r->type) {
 812                                 XML::addElement($doc, $entry, "activity:object-type", $r->type);
 813                         }
 814
 815                         if ($r->id) {
 816                                 XML::addElement($doc, $entry, "id", $r->id);
 817                         }
 818
 819                         if ($r->title) {
 820                                 XML::addElement($doc, $entry, "title", $r->title);
 821                         }
 822
 823                         if ($r->link) {
 824                                 if (substr($r->link, 0, 1) == '<') {
 825                                         if (strstr($r->link, '&') && (! strstr($r->link, '&amp;'))) {
 826                                                 $r->link = str_replace('&', '&amp;', $r->link);
 827                                         }
 828
 829                                         $r->link = preg_replace('/\<link(.*?)\"\>/', '<link$1"/>', $r->link);
 830
 831                                         // XML does need a single element as root element so we add a dummy element here
 832                                         $data = XML::parseString("<dummy>" . $r->link . "</dummy>");
 833                                         if (is_object($data)) {
 834                                                 foreach ($data->link as $link) {
 835                                                         $attributes = [];
 836                                                         foreach ($link->attributes() as $parameter => $value) {
 837                                                                 $attributes[$parameter] = $value;
 838                                                         }
 839                                                         XML::addElement($doc, $entry, "link", "", $attributes);
 840                                                 }
 841                                         }
 842                                 } else {
 843                                         $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $r->link];
 844                                         XML::addElement($doc, $entry, "link", "", $attributes);
 845                                 }
 846                         }
 847                         if ($r->content) {
 848                                 XML::addElement($doc, $entry, "content", BBCode::convert($r->content), ["type" => "html"]);
 849                         }
 850
 851                         return $entry;
 852                 }
 853
 854                 return false;
 855         }
 856
 857         /**
 858          * Adds the elements for attachments
 859          *
 860          * @param object $doc  XML document
 861          * @param object $root XML root
 862          * @param array  $item Item element
 863          *
 864          * @return void XML attachment object
 865          * @todo  Find proper type-hints
 866          */
 867         private static function getAttachment($doc, $root, $item)
 868         {
 869                 $arr = explode('[/attach],', $item['attach']);
 870                 if (count($arr)) {
 871                         foreach ($arr as $r) {
 872                                 $matches = false;
 873                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 874                                 if ($cnt) {
 875                                         $attributes = ["rel" => "enclosure",
 876                                                         "href" => $matches[1],
 877                                                         "type" => $matches[3]];
 878
 879                                         if (intval($matches[2])) {
 880                                                 $attributes["length"] = intval($matches[2]);
 881                                         }
 882
 883                                         if (trim($matches[4]) != "") {
 884                                                 $attributes["title"] = trim($matches[4]);
 885                                         }
 886
 887                                         XML::addElement($doc, $root, "link", "", $attributes);
 888                                 }
 889                         }
 890                 }
 891         }
 892
 893         /**
 894          * Adds the "entry" elements for the DFRN protocol
 895          *
 896          * @param DOMDocument $doc     XML document
 897          * @param string      $type    "text" or "html"
 898          * @param array       $item    Item element
 899          * @param array       $owner   Owner record
 900          * @param bool        $comment Trigger the sending of the "comment" element
 901          * @param int         $cid     Contact ID of the recipient
 902          * @param bool        $single  If set, the entry is created as an XML document with a single "entry" element
 903          *
 904          * @return null|\DOMElement XML entry object
 905          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 906          * @throws \ImagickException
 907          * @todo  Find proper type-hints
 908          */
 909         private static function entry(DOMDocument $doc, $type, array $item, array $owner, $comment = false, $cid = 0, $single = false)
 910         {
 911                 $mentioned = [];
 912
 913                 if (!$item['parent']) {
 914                         Logger::notice('Item without parent found.', ['type' => $type, 'item' => $item]);
 915                         return null;
 916                 }
 917
 918                 if ($item['deleted']) {
 919                         $attributes = ["ref" => $item['uri'], "when" => DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM)];
 920                         return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 921                 }
 922
 923                 if (!$single) {
 924                         $entry = $doc->createElement("entry");
 925                 } else {
 926                         $entry = $doc->createElementNS(ActivityNamespace::ATOM1, 'entry');
 927                         $doc->appendChild($entry);
 928
 929                         $entry->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 930                         $entry->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 931                         $entry->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 932                         $entry->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 933                         $entry->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 934                         $entry->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 935                         $entry->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 936                         $entry->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 937                         $entry->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 938                 }
 939
 940                 if ($item['private'] == Item::PRIVATE) {
 941                         $body = Item::fixPrivatePhotos($item['body'], $owner['uid'], $item, $cid);
 942                 } else {
 943                         $body = $item['body'];
 944                 }
 945
 946                 // Remove the abstract element. It is only locally important.
 947                 $body = BBCode::stripAbstract($body);
 948
 949                 $htmlbody = '';
 950                 if ($type == 'html') {
 951                         $htmlbody = $body;
 952
 953                         if ($item['title'] != "") {
 954                                 $htmlbody = "[b]" . $item['title'] . "[/b]\n\n" . $htmlbody;
 955                         }
 956
 957                         $htmlbody = BBCode::convert($htmlbody, false, BBCode::OSTATUS);
 958                 }
 959
 960                 $author = self::addEntryAuthor($doc, "author", $item["author-link"], $item);
 961                 $entry->appendChild($author);
 962
 963                 $dfrnowner = self::addEntryAuthor($doc, "dfrn:owner", $item["owner-link"], $item);
 964                 $entry->appendChild($dfrnowner);
 965
 966                 if ($item['gravity'] != GRAVITY_PARENT) {
 967                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 968                         $parent = Item::selectFirst(['guid', 'plink'], ['uri' => $parent_item, 'uid' => $item['uid']]);
 969                         if (DBA::isResult($parent)) {
 970                                 $attributes = ["ref" => $parent_item, "type" => "text/html",
 971                                         "href" => $parent['plink'],
 972                                         "dfrn:diaspora_guid" => $parent['guid']];
 973                                 XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 974                         }
 975                 }
 976
 977                 // Add conversation data. This is used for OStatus
 978                 $conversation_href = DI::baseUrl()."/display/".$item["parent-guid"];
 979                 $conversation_uri = $conversation_href;
 980
 981                 if (isset($parent_item)) {
 982                         $conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $item['parent-uri']]);
 983                         if (DBA::isResult($conversation)) {
 984                                 if ($conversation['conversation-uri'] != '') {
 985                                         $conversation_uri = $conversation['conversation-uri'];
 986                                 }
 987                                 if ($conversation['conversation-href'] != '') {
 988                                         $conversation_href = $conversation['conversation-href'];
 989                                 }
 990                         }
 991                 }
 992
 993                 $attributes = [
 994                                 "href" => $conversation_href,
 995                                 "ref" => $conversation_uri];
 996
 997                 XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
 998
 999                 XML::addElement($doc, $entry, "id", $item["uri"]);
1000                 XML::addElement($doc, $entry, "title", $item["title"]);
1001
1002                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"] . "+00:00", DateTimeFormat::ATOM));
1003                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"] . "+00:00", DateTimeFormat::ATOM));
1004
1005                 // "dfrn:env" is used to read the content
1006                 XML::addElement($doc, $entry, "dfrn:env", Strings::base64UrlEncode($body, true));
1007
1008                 // The "content" field is not read by the receiver. We could remove it when the type is "text"
1009                 // We keep it at the moment, maybe there is some old version that doesn't read "dfrn:env"
1010                 XML::addElement($doc, $entry, "content", (($type == 'html') ? $htmlbody : $body), ["type" => $type]);
1011
1012                 // We save this value in "plink". Maybe we should read it from there as well?
1013                 XML::addElement(
1014                         $doc,
1015                         $entry,
1016                         "link",
1017                         "",
1018                         ["rel" => "alternate", "type" => "text/html",
1019                                  "href" => DI::baseUrl() . "/display/" . $item["guid"]]
1020                 );
1021
1022                 // "comment-allow" is some old fashioned stuff for old Friendica versions.
1023                 // It is included in the rewritten code for completeness
1024                 if ($comment) {
1025                         XML::addElement($doc, $entry, "dfrn:comment-allow", 1);
1026                 }
1027
1028                 if ($item['location']) {
1029                         XML::addElement($doc, $entry, "dfrn:location", $item['location']);
1030                 }
1031
1032                 if ($item['coord']) {
1033                         XML::addElement($doc, $entry, "georss:point", $item['coord']);
1034                 }
1035
1036                 if ($item['private']) {
1037                         // Friendica versions prior to 2020.3 can't handle "unlisted" properly. So we can only transmit public and private
1038                         XML::addElement($doc, $entry, "dfrn:private", ($item['private'] == Item::PRIVATE ? Item::PRIVATE : Item::PUBLIC));
1039                         XML::addElement($doc, $entry, "dfrn:unlisted", $item['private'] == Item::UNLISTED);
1040                 }
1041
1042                 if ($item['extid']) {
1043                         XML::addElement($doc, $entry, "dfrn:extid", $item['extid']);
1044                 }
1045
1046                 if ($item['post-type'] == Item::PT_PAGE) {
1047                         XML::addElement($doc, $entry, "dfrn:bookmark", "true");
1048                 }
1049
1050                 if ($item['app']) {
1051                         XML::addElement($doc, $entry, "statusnet:notice_info", "", ["local_id" => $item['id'], "source" => $item['app']]);
1052                 }
1053
1054                 XML::addElement($doc, $entry, "dfrn:diaspora_guid", $item["guid"]);
1055
1056                 // The signed text contains the content in Markdown, the sender handle and the signatur for the content
1057                 // It is needed for relayed comments to Diaspora.
1058                 if ($item['signed_text']) {
1059                         $sign = base64_encode(json_encode(['signed_text' => $item['signed_text'],'signature' => '','signer' => '']));
1060                         XML::addElement($doc, $entry, "dfrn:diaspora_signature", $sign);
1061                 }
1062
1063                 XML::addElement($doc, $entry, "activity:verb", self::constructVerb($item));
1064
1065                 if ($item['object-type'] != "") {
1066                         XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
1067                 } elseif ($item['gravity'] == GRAVITY_PARENT) {
1068                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::NOTE);
1069                 } else {
1070                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::COMMENT);
1071                 }
1072
1073                 $actobj = self::createActivity($doc, "activity:object", $item['object']);
1074                 if ($actobj) {
1075                         $entry->appendChild($actobj);
1076                 }
1077
1078                 $actarg = self::createActivity($doc, "activity:target", $item['target']);
1079                 if ($actarg) {
1080                         $entry->appendChild($actarg);
1081                 }
1082
1083                 $tags = Tag::getByURIId($item['uri-id']);
1084
1085                 if (count($tags)) {
1086                         foreach ($tags as $tag) {
1087                                 if (($type != 'html') || ($tag['type'] == Tag::HASHTAG)) {
1088                                         XML::addElement($doc, $entry, "category", "", ["scheme" => "X-DFRN:" . Tag::TAG_CHARACTER[$tag['type']] . ":" . $tag['url'], "term" => $tag['name']]);
1089                                 }
1090                                 if ($tag['type'] != Tag::HASHTAG) {
1091                                         $mentioned[$tag['url']] = $tag['url'];
1092                                 }
1093                         }
1094                 }
1095
1096                 foreach ($mentioned as $mention) {
1097                         $condition = ['uid' => $owner["uid"], 'nurl' => Strings::normaliseLink($mention)];
1098                         $contact = DBA::selectFirst('contact', ['forum', 'prv'], $condition);
1099
1100                         if (DBA::isResult($contact) && ($contact["forum"] || $contact["prv"])) {
1101                                 XML::addElement(
1102                                         $doc,
1103                                         $entry,
1104                                         "link",
1105                                         "",
1106                                         ["rel" => "mentioned",
1107                                                         "ostatus:object-type" => Activity\ObjectType::GROUP,
1108                                                         "href" => $mention]
1109                                 );
1110                         } else {
1111                                 XML::addElement(
1112                                         $doc,
1113                                         $entry,
1114                                         "link",
1115                                         "",
1116                                         ["rel" => "mentioned",
1117                                                         "ostatus:object-type" => Activity\ObjectType::PERSON,
1118                                                         "href" => $mention]
1119                                 );
1120                         }
1121                 }
1122
1123                 self::getAttachment($doc, $entry, $item);
1124
1125                 return $entry;
1126         }
1127
1128         /**
1129          * encrypts data via AES
1130          *
1131          * @param string $data The data that is to be encrypted
1132          * @param string $key  The AES key
1133          *
1134          * @return string encrypted data
1135          */
1136         private static function aesEncrypt($data, $key)
1137         {
1138                 return openssl_encrypt($data, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1139         }
1140
1141         /**
1142          * decrypts data via AES
1143          *
1144          * @param string $encrypted The encrypted data
1145          * @param string $key       The AES key
1146          *
1147          * @return string decrypted data
1148          */
1149         public static function aesDecrypt($encrypted, $key)
1150         {
1151                 return openssl_decrypt($encrypted, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1152         }
1153
1154         /**
1155          * Delivers the atom content to the contacts
1156          *
1157          * @param array  $owner    Owner record
1158          * @param array  $contact  Contact record of the receiver
1159          * @param string $atom     Content that will be transmitted
1160          * @param bool   $dissolve (to be documented)
1161          *
1162          * @return int Deliver status. Negative values mean an error.
1163          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1164          * @throws \ImagickException
1165          * @todo  Add array type-hint for $owner, $contact
1166          */
1167         public static function deliver($owner, $contact, $atom, $dissolve = false)
1168         {
1169                 $idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);
1170
1171                 if ($contact['duplex'] && $contact['dfrn-id']) {
1172                         $idtosend = '0:' . $orig_id;
1173                 }
1174                 if ($contact['duplex'] && $contact['issued-id']) {
1175                         $idtosend = '1:' . $orig_id;
1176                 }
1177
1178                 $rino = DI::config()->get('system', 'rino_encrypt');
1179                 $rino = intval($rino);
1180
1181                 Logger::log("Local rino version: ". $rino, Logger::DEBUG);
1182
1183                 $ssl_val = intval(DI::config()->get('system', 'ssl_policy'));
1184
1185                 switch ($ssl_val) {
1186                         case BaseURL::SSL_POLICY_FULL:
1187                                 $ssl_policy = 'full';
1188                                 break;
1189                         case BaseURL::SSL_POLICY_SELFSIGN:
1190                                 $ssl_policy = 'self';
1191                                 break;
1192                         case BaseURL::SSL_POLICY_NONE:
1193                         default:
1194                                 $ssl_policy = 'none';
1195                                 break;
1196                 }
1197
1198                 $url = $contact['notify'] . '&dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino='.$rino : '');
1199
1200                 Logger::log('dfrn_deliver: ' . $url);
1201
1202                 $curlResult = DI::httpRequest()->get($url);
1203
1204                 if ($curlResult->isTimeout()) {
1205                         return -2; // timed out
1206                 }
1207
1208                 $xml = $curlResult->getBody();
1209
1210                 $curl_stat = $curlResult->getReturnCode();
1211                 if (empty($curl_stat)) {
1212                         return -3; // timed out
1213                 }
1214
1215                 Logger::log('dfrn_deliver: ' . $xml, Logger::DATA);
1216
1217                 if (empty($xml)) {
1218                         return 3;
1219                 }
1220
1221                 if (strpos($xml, '<?xml') === false) {
1222                         Logger::log('dfrn_deliver: no valid XML returned');
1223                         Logger::log('dfrn_deliver: returned XML: ' . $xml, Logger::DATA);
1224                         return 3;
1225                 }
1226
1227                 $res = XML::parseString($xml);
1228
1229                 if (!is_object($res) || (intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
1230                         if (empty($res->status)) {
1231                                 $status = 3;
1232                         } else {
1233                                 $status = $res->status;
1234                         }
1235
1236                         return $status;
1237                 }
1238
1239                 $postvars     = [];
1240                 $sent_dfrn_id = hex2bin((string) $res->dfrn_id);
1241                 $challenge    = hex2bin((string) $res->challenge);
1242                 $perm         = (($res->perm) ? $res->perm : null);
1243                 $dfrn_version = floatval($res->dfrn_version ?: 2.0);
1244                 $rino_remote_version = intval($res->rino);
1245                 $page         = (($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? 1 : 0);
1246
1247                 Logger::log("Remote rino version: ".$rino_remote_version." for ".$contact["url"], Logger::DEBUG);
1248
1249                 if ($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
1250                         $page = 2;
1251                 }
1252
1253                 $final_dfrn_id = '';
1254
1255                 if ($perm) {
1256                         if ((($perm == 'rw') && !intval($contact['writable']))
1257                                 || (($perm == 'r') && intval($contact['writable']))
1258                         ) {
1259                                 DBA::update('contact', ['writable' => ($perm == 'rw')], ['id' => $contact['id']]);
1260
1261                                 $contact['writable'] = (string) 1 - intval($contact['writable']);
1262                         }
1263                 }
1264
1265                 if (($contact['duplex'] && strlen($contact['pubkey']))
1266                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1267                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1268                 ) {
1269                         openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
1270                         openssl_public_decrypt($challenge, $postvars['challenge'], $contact['pubkey']);
1271                 } else {
1272                         openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
1273                         openssl_private_decrypt($challenge, $postvars['challenge'], $contact['prvkey']);
1274                 }
1275
1276                 $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
1277
1278                 if (strpos($final_dfrn_id, ':') == 1) {
1279                         $final_dfrn_id = substr($final_dfrn_id, 2);
1280                 }
1281
1282                 if ($final_dfrn_id != $orig_id) {
1283                         Logger::log('dfrn_deliver: wrong dfrn_id.');
1284                         // did not decode properly - cannot trust this site
1285                         return 3;
1286                 }
1287
1288                 $postvars['dfrn_id']      = $idtosend;
1289                 $postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
1290                 if ($dissolve) {
1291                         $postvars['dissolve'] = '1';
1292                 }
1293
1294                 if ((($contact['rel']) && ($contact['rel'] != Contact::SHARING) && (! $contact['blocked'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1295                         $postvars['data'] = $atom;
1296                         $postvars['perm'] = 'rw';
1297                 } else {
1298                         $postvars['data'] = str_replace('<dfrn:comment-allow>1', '<dfrn:comment-allow>0', $atom);
1299                         $postvars['perm'] = 'r';
1300                 }
1301
1302                 $postvars['ssl_policy'] = $ssl_policy;
1303
1304                 if ($page) {
1305                         $postvars['page'] = $page;
1306                 }
1307
1308
1309                 if ($rino > 0 && $rino_remote_version > 0 && (! $dissolve)) {
1310                         Logger::log('rino version: '. $rino_remote_version);
1311
1312                         switch ($rino_remote_version) {
1313                                 case 1:
1314                                         $key = openssl_random_pseudo_bytes(16);
1315                                         $data = self::aesEncrypt($postvars['data'], $key);
1316                                         break;
1317
1318                                 default:
1319                                         Logger::log("rino: invalid requested version '$rino_remote_version'");
1320                                         return -8;
1321                         }
1322
1323                         $postvars['rino'] = $rino_remote_version;
1324                         $postvars['data'] = bin2hex($data);
1325
1326                         if ($dfrn_version >= 2.1) {
1327                                 if (($contact['duplex'] && strlen($contact['pubkey']))
1328                                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1329                                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1330                                 ) {
1331                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1332                                 } else {
1333                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1334                                 }
1335                         } else {
1336                                 if (($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1337                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1338                                 } else {
1339                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1340                                 }
1341                         }
1342
1343                         Logger::log('md5 rawkey ' . md5($postvars['key']));
1344
1345                         $postvars['key'] = bin2hex($postvars['key']);
1346                 }
1347
1348
1349                 Logger::debug('dfrn_deliver', ['post' => $postvars]);
1350
1351                 $postResult = DI::httpRequest()->post($contact['notify'], $postvars);
1352
1353                 $xml = $postResult->getBody();
1354
1355                 Logger::log('dfrn_deliver: ' . "RECEIVED: " . $xml, Logger::DATA);
1356
1357                 $curl_stat = $postResult->getReturnCode();
1358                 if (empty($curl_stat) || empty($xml)) {
1359                         return -9; // timed out
1360                 }
1361
1362                 if (($curl_stat == 503) && stristr($postResult->getHeader(), 'retry-after')) {
1363                         return -10;
1364                 }
1365
1366                 if (strpos($xml, '<?xml') === false) {
1367                         Logger::log('dfrn_deliver: phase 2: no valid XML returned');
1368                         Logger::log('dfrn_deliver: phase 2: returned XML: ' . $xml, Logger::DATA);
1369                         return 3;
1370                 }
1371
1372                 $res = XML::parseString($xml);
1373
1374                 if (!isset($res->status)) {
1375                         return -11;
1376                 }
1377
1378                 // Possibly old servers had returned an empty value when everything was okay
1379                 if (empty($res->status)) {
1380                         $res->status = 200;
1381                 }
1382
1383                 if (!empty($res->message)) {
1384                         Logger::log('Delivery returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1385                 }
1386
1387                 return intval($res->status);
1388         }
1389
1390         /**
1391          * Transmits atom content to the contacts via the Diaspora transport layer
1392          *
1393          * @param array  $owner   Owner record
1394          * @param array  $contact Contact record of the receiver
1395          * @param string $atom    Content that will be transmitted
1396          *
1397          * @param bool   $public_batch
1398          * @return int Deliver status. Negative values mean an error.
1399          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1400          * @throws \ImagickException
1401          */
1402         public static function transmit($owner, $contact, $atom, $public_batch = false)
1403         {
1404                 if (!$public_batch) {
1405                         if (empty($contact['addr'])) {
1406                                 Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
1407                                 if (Contact::updateFromProbe($contact['id'])) {
1408                                         $new_contact = DBA::selectFirst('contact', ['addr'], ['id' => $contact['id']]);
1409                                         $contact['addr'] = $new_contact['addr'];
1410                                 }
1411
1412                                 if (empty($contact['addr'])) {
1413                                         Logger::log('Unable to find contact handle for ' . $contact['id'] . ' - ' . $contact['url']);
1414                                         return -21;
1415                                 }
1416                         }
1417
1418                         $fcontact = FContact::getByURL($contact['addr']);
1419                         if (empty($fcontact)) {
1420                                 Logger::log('Unable to find contact details for ' . $contact['id'] . ' - ' . $contact['addr']);
1421                                 return -22;
1422                         }
1423                         $pubkey = $fcontact['pubkey'];
1424                 } else {
1425                         $pubkey = '';
1426                 }
1427
1428                 $envelope = Diaspora::buildMessage($atom, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
1429
1430                 // Create the endpoint for public posts. This is some WIP and should later be added to the probing
1431                 if ($public_batch && empty($contact["batch"])) {
1432                         $parts = parse_url($contact["notify"]);
1433                         $path_parts = explode('/', $parts['path']);
1434                         array_pop($path_parts);
1435                         $parts['path'] =  implode('/', $path_parts);
1436                         $contact["batch"] = Network::unparseURL($parts);
1437                 }
1438
1439                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
1440
1441                 if (empty($dest_url)) {
1442                         Logger::info('Empty destination', ['public' => $public_batch, 'contact' => $contact]);
1443                         return -24;
1444                 }
1445
1446                 $content_type = ($public_batch ? "application/magic-envelope+xml" : "application/json");
1447
1448                 $postResult = DI::httpRequest()->post($dest_url, $envelope, ["Content-Type: " . $content_type]);
1449                 $xml = $postResult->getBody();
1450
1451                 $curl_stat = $postResult->getReturnCode();
1452                 if (empty($curl_stat) || empty($xml)) {
1453                         Logger::log('Empty answer from ' . $contact['id'] . ' - ' . $dest_url);
1454                         return -9; // timed out
1455                 }
1456
1457                 if (($curl_stat == 503) && (stristr($postResult->getHeader(), 'retry-after'))) {
1458                         return -10;
1459                 }
1460
1461                 if (strpos($xml, '<?xml') === false) {
1462                         Logger::log('No valid XML returned from ' . $contact['id'] . ' - ' . $dest_url);
1463                         Logger::log('Returned XML: ' . $xml, Logger::DATA);
1464                         return 3;
1465                 }
1466
1467                 $res = XML::parseString($xml);
1468
1469                 if (empty($res->status)) {
1470                         return -23;
1471                 }
1472
1473                 if (!empty($res->message)) {
1474                         Logger::log('Transmit to ' . $dest_url . ' returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1475                 }
1476
1477                 return intval($res->status);
1478         }
1479
1480         /**
1481          * Fetch the author data from head or entry items
1482          *
1483          * @param object $xpath     XPath object
1484          * @param object $context   In which context should the data be searched
1485          * @param array  $importer  Record of the importer user mixed with contact of the content
1486          * @param string $element   Element name from which the data is fetched
1487          * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
1488          * @param string $xml       optional, default empty
1489          *
1490          * @return array Relevant data of the author
1491          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1492          * @throws \ImagickException
1493          * @todo  Find good type-hints for all parameter
1494          */
1495         private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
1496         {
1497                 $author = [];
1498                 $author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
1499                 $author["link"] = XML::getFirstNodeValue($xpath, $element."/atom:uri/text()", $context);
1500
1501                 $fields = ['id', 'uid', 'url', 'network', 'avatar-date', 'avatar', 'name-date', 'uri-date', 'addr',
1502                         'name', 'nick', 'about', 'location', 'keywords', 'xmpp', 'bdyear', 'bd', 'hidden', 'contact-type'];
1503                 $condition = ["`uid` = ? AND `nurl` = ? AND `network` != ? AND NOT `pending` AND NOT `blocked`",
1504                         $importer["importer_uid"], Strings::normaliseLink($author["link"]), Protocol::STATUSNET];
1505
1506                 if ($importer['account-type'] != User::ACCOUNT_TYPE_COMMUNITY) {
1507                         $condition = DBA::mergeConditions($condition, ['rel' => [Contact::SHARING, Contact::FRIEND]]);
1508                 }
1509
1510                 $contact_old = DBA::selectFirst('contact', $fields, $condition);
1511
1512                 if (DBA::isResult($contact_old)) {
1513                         $author["contact-id"] = $contact_old["id"];
1514                         $author["network"] = $contact_old["network"];
1515                 } else {
1516                         Logger::info('Contact not found', ['condition' => $condition]);
1517
1518                         $author["contact-unknown"] = true;
1519                         $contact = Contact::getByURL($author["link"], null, ["id", "network"]);
1520                         $author["contact-id"] = $contact["id"] ?? $importer["id"];
1521                         $author["network"] = $contact["network"] ?? $importer["network"];
1522                         $onlyfetch = true;
1523                 }
1524
1525                 // Until now we aren't serving different sizes - but maybe later
1526                 $avatarlist = [];
1527                 /// @todo check if "avatar" or "photo" would be the best field in the specification
1528                 $avatars = $xpath->query($element . "/atom:link[@rel='avatar']", $context);
1529                 foreach ($avatars as $avatar) {
1530                         $href = "";
1531                         $width = 0;
1532                         foreach ($avatar->attributes as $attributes) {
1533                                 /// @TODO Rewrite these similar if() to one switch
1534                                 if ($attributes->name == "href") {
1535                                         $href = $attributes->textContent;
1536                                 }
1537                                 if ($attributes->name == "width") {
1538                                         $width = $attributes->textContent;
1539                                 }
1540                                 if ($attributes->name == "updated") {
1541                                         $author["avatar-date"] = $attributes->textContent;
1542                                 }
1543                         }
1544                         if (($width > 0) && ($href != "")) {
1545                                 $avatarlist[$width] = $href;
1546                         }
1547                 }
1548
1549                 if (count($avatarlist) > 0) {
1550                         krsort($avatarlist);
1551                         $author["avatar"] = current($avatarlist);
1552                 }
1553
1554                 if (empty($author['avatar']) && !empty($author['link'])) {
1555                         $cid = Contact::getIdForURL($author['link'], 0);
1556                         if (!empty($cid)) {
1557                                 $contact = DBA::selectFirst('contact', ['avatar'], ['id' => $cid]);
1558                                 if (DBA::isResult($contact)) {
1559                                         $author['avatar'] = $contact['avatar'];
1560                                 }
1561                         }
1562                 }
1563
1564                 if (empty($author['avatar'])) {
1565                         Logger::log('Empty author: ' . $xml);
1566                         $author['avatar'] = '';
1567                 }
1568
1569                 if (DBA::isResult($contact_old) && !$onlyfetch) {
1570                         Logger::log("Check if contact details for contact " . $contact_old["id"] . " (" . $contact_old["nick"] . ") have to be updated.", Logger::DEBUG);
1571
1572                         $poco = ["url" => $contact_old["url"], "network" => $contact_old["network"]];
1573
1574                         // When was the last change to name or uri?
1575                         $name_element = $xpath->query($element . "/atom:name", $context)->item(0);
1576                         foreach ($name_element->attributes as $attributes) {
1577                                 if ($attributes->name == "updated") {
1578                                         $poco["name-date"] = $attributes->textContent;
1579                                 }
1580                         }
1581
1582                         $link_element = $xpath->query($element . "/atom:link", $context)->item(0);
1583                         foreach ($link_element->attributes as $attributes) {
1584                                 if ($attributes->name == "updated") {
1585                                         $poco["uri-date"] = $attributes->textContent;
1586                                 }
1587                         }
1588
1589                         // Update contact data
1590                         $value = XML::getFirstNodeValue($xpath, $element . "/dfrn:handle/text()", $context);
1591                         if ($value != "") {
1592                                 $poco["addr"] = $value;
1593                         }
1594
1595                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:displayName/text()", $context);
1596                         if ($value != "") {
1597                                 $poco["name"] = $value;
1598                         }
1599
1600                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:preferredUsername/text()", $context);
1601                         if ($value != "") {
1602                                 $poco["nick"] = $value;
1603                         }
1604
1605                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:note/text()", $context);
1606                         if ($value != "") {
1607                                 $poco["about"] = $value;
1608                         }
1609
1610                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:address/poco:formatted/text()", $context);
1611                         if ($value != "") {
1612                                 $poco["location"] = $value;
1613                         }
1614
1615                         /// @todo Only search for elements with "poco:type" = "xmpp"
1616                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:ims/poco:value/text()", $context);
1617                         if ($value != "") {
1618                                 $poco["xmpp"] = $value;
1619                         }
1620
1621                         /// @todo Add support for the following fields that we don't support by now in the contact table:
1622                         /// - poco:utcOffset
1623                         /// - poco:urls
1624                         /// - poco:locality
1625                         /// - poco:region
1626                         /// - poco:country
1627
1628                         // If the "hide" element is present then the profile isn't searchable.
1629                         $hide = intval(XML::getFirstNodeValue($xpath, $element . "/dfrn:hide/text()", $context) == "true");
1630
1631                         Logger::log("Hidden status for contact " . $contact_old["url"] . ": " . $hide, Logger::DEBUG);
1632
1633                         // If the contact isn't searchable then set the contact to "hidden".
1634                         // Problem: This can be manually overridden by the user.
1635                         if ($hide) {
1636                                 $contact_old["hidden"] = true;
1637                         }
1638
1639                         // Save the keywords into the contact table
1640                         $tags = [];
1641                         $tagelements = $xpath->evaluate($element . "/poco:tags/text()", $context);
1642                         foreach ($tagelements as $tag) {
1643                                 $tags[$tag->nodeValue] = $tag->nodeValue;
1644                         }
1645
1646                         if (count($tags)) {
1647                                 $poco["keywords"] = implode(", ", $tags);
1648                         }
1649
1650                         // "dfrn:birthday" contains the birthday converted to UTC
1651                         $birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1652
1653                         if (strtotime($birthday) > time()) {
1654                                 $bd_timestamp = strtotime($birthday);
1655
1656                                 $poco["bdyear"] = date("Y", $bd_timestamp);
1657                         }
1658
1659                         // "poco:birthday" is the birthday in the format "yyyy-mm-dd"
1660                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1661
1662                         if (!in_array($value, ["", "0000-00-00", DBA::NULL_DATE])) {
1663                                 $bdyear = date("Y");
1664                                 $value = str_replace(["0000", "0001"], $bdyear, $value);
1665
1666                                 if (strtotime($value) < time()) {
1667                                         $value = str_replace($bdyear, $bdyear + 1, $value);
1668                                 }
1669
1670                                 $poco["bd"] = $value;
1671                         }
1672
1673                         $contact = array_merge($contact_old, $poco);
1674
1675                         if ($contact_old["bdyear"] != $contact["bdyear"]) {
1676                                 Event::createBirthday($contact, $birthday);
1677                         }
1678
1679                         $fields = ['name' => $contact['name'], 'nick' => $contact['nick'], 'about' => $contact['about'],
1680                                 'location' => $contact['location'], 'addr' => $contact['addr'], 'keywords' => $contact['keywords'],
1681                                 'bdyear' => $contact['bdyear'], 'bd' => $contact['bd'], 'hidden' => $contact['hidden'],
1682                                 'xmpp' => $contact['xmpp'], 'name-date' => DateTimeFormat::utc($contact['name-date']),
1683                                 'unsearchable' => $contact['hidden'], 'uri-date' => DateTimeFormat::utc($contact['uri-date'])];
1684
1685                         DBA::update('contact', $fields, ['id' => $contact['id'], 'network' => $contact['network']], $contact_old);
1686
1687                         // Update the public contact. Don't set the "hidden" value, this is used differently for public contacts
1688                         unset($fields['hidden']);
1689                         $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($contact_old['url'])];
1690                         DBA::update('contact', $fields, $condition, true);
1691
1692                         Contact::updateAvatar($contact['id'], $author['avatar']);
1693
1694                         $pcid = Contact::getIdForURL($contact_old['url']);
1695                         if (!empty($pcid)) {
1696                                 Contact::updateAvatar($pcid, $author['avatar']);
1697                         }
1698                 }
1699
1700                 return $author;
1701         }
1702
1703         /**
1704          * Transforms activity objects into an XML string
1705          *
1706          * @param object $xpath    XPath object
1707          * @param object $activity Activity object
1708          * @param string $element  element name
1709          *
1710          * @return string XML string
1711          * @todo Find good type-hints for all parameter
1712          */
1713         private static function transformActivity($xpath, $activity, $element)
1714         {
1715                 if (!is_object($activity)) {
1716                         return "";
1717                 }
1718
1719                 $obj_doc = new DOMDocument("1.0", "utf-8");
1720                 $obj_doc->formatOutput = true;
1721
1722                 $obj_element = $obj_doc->createElementNS( ActivityNamespace::ATOM1, $element);
1723
1724                 $activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
1725                 XML::addElement($obj_doc, $obj_element, "type", $activity_type);
1726
1727                 $id = $xpath->query("atom:id", $activity)->item(0);
1728                 if (is_object($id)) {
1729                         $obj_element->appendChild($obj_doc->importNode($id, true));
1730                 }
1731
1732                 $title = $xpath->query("atom:title", $activity)->item(0);
1733                 if (is_object($title)) {
1734                         $obj_element->appendChild($obj_doc->importNode($title, true));
1735                 }
1736
1737                 $links = $xpath->query("atom:link", $activity);
1738                 if (is_object($links)) {
1739                         foreach ($links as $link) {
1740                                 $obj_element->appendChild($obj_doc->importNode($link, true));
1741                         }
1742                 }
1743
1744                 $content = $xpath->query("atom:content", $activity)->item(0);
1745                 if (is_object($content)) {
1746                         $obj_element->appendChild($obj_doc->importNode($content, true));
1747                 }
1748
1749                 $obj_doc->appendChild($obj_element);
1750
1751                 $objxml = $obj_doc->saveXML($obj_element);
1752
1753                 /// @todo This isn't totally clean. We should find a way to transform the namespaces
1754                 $objxml = str_replace("<".$element.' xmlns="http://www.w3.org/2005/Atom">', "<".$element.">", $objxml);
1755                 return($objxml);
1756         }
1757
1758         /**
1759          * Processes the mail elements
1760          *
1761          * @param object $xpath    XPath object
1762          * @param object $mail     mail elements
1763          * @param array  $importer Record of the importer user mixed with contact of the content
1764          * @return void
1765          * @throws \Exception
1766          * @todo  Find good type-hints for all parameter
1767          */
1768         private static function processMail($xpath, $mail, $importer)
1769         {
1770                 Logger::log("Processing mails");
1771
1772                 $msg = [];
1773                 $msg["uid"] = $importer["importer_uid"];
1774                 $msg["from-name"] = XML::getFirstValue($xpath, "dfrn:sender/dfrn:name/text()", $mail);
1775                 $msg["from-url"] = XML::getFirstValue($xpath, "dfrn:sender/dfrn:uri/text()", $mail);
1776                 $msg["from-photo"] = XML::getFirstValue($xpath, "dfrn:sender/dfrn:avatar/text()", $mail);
1777                 $msg["contact-id"] = $importer["id"];
1778                 $msg["uri"] = XML::getFirstValue($xpath, "dfrn:id/text()", $mail);
1779                 $msg["parent-uri"] = XML::getFirstValue($xpath, "dfrn:in-reply-to/text()", $mail);
1780                 $msg["created"] = DateTimeFormat::utc(XML::getFirstValue($xpath, "dfrn:sentdate/text()", $mail));
1781                 $msg["title"] = XML::getFirstValue($xpath, "dfrn:subject/text()", $mail);
1782                 $msg["body"] = XML::getFirstValue($xpath, "dfrn:content/text()", $mail);
1783
1784                 Mail::insert($msg);
1785         }
1786
1787         /**
1788          * Processes the suggestion elements
1789          *
1790          * @param object $xpath      XPath object
1791          * @param object $suggestion suggestion elements
1792          * @param array  $importer   Record of the importer user mixed with contact of the content
1793          * @return boolean
1794          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1795          * @todo  Find good type-hints for all parameter
1796          */
1797         private static function processSuggestion($xpath, $suggestion, $importer)
1798         {
1799                 Logger::notice('Processing suggestions');
1800
1801                 $url = $xpath->evaluate('string(dfrn:url[1]/text())', $suggestion);
1802                 $cid = Contact::getIdForURL($url);
1803                 $note = $xpath->evaluate('string(dfrn:note[1]/text())', $suggestion);
1804
1805                 return FContact::addSuggestion($importer['importer_uid'], $cid, $importer['id'], $note);
1806         }
1807
1808         /**
1809          * Processes the relocation elements
1810          *
1811          * @param object $xpath      XPath object
1812          * @param object $relocation relocation elements
1813          * @param array  $importer   Record of the importer user mixed with contact of the content
1814          * @return boolean
1815          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1816          * @throws \ImagickException
1817          * @todo  Find good type-hints for all parameter
1818          */
1819         private static function processRelocation($xpath, $relocation, $importer)
1820         {
1821                 Logger::log("Processing relocations");
1822
1823                 /// @TODO Rewrite this to one statement
1824                 $relocate = [];
1825                 $relocate["uid"] = $importer["importer_uid"];
1826                 $relocate["cid"] = $importer["id"];
1827                 $relocate["url"] = $xpath->query("dfrn:url/text()", $relocation)->item(0)->nodeValue;
1828                 $relocate["addr"] = $xpath->query("dfrn:addr/text()", $relocation)->item(0)->nodeValue;
1829                 $relocate["name"] = $xpath->query("dfrn:name/text()", $relocation)->item(0)->nodeValue;
1830                 $relocate["avatar"] = $xpath->query("dfrn:avatar/text()", $relocation)->item(0)->nodeValue;
1831                 $relocate["photo"] = $xpath->query("dfrn:photo/text()", $relocation)->item(0)->nodeValue;
1832                 $relocate["thumb"] = $xpath->query("dfrn:thumb/text()", $relocation)->item(0)->nodeValue;
1833                 $relocate["micro"] = $xpath->query("dfrn:micro/text()", $relocation)->item(0)->nodeValue;
1834                 $relocate["request"] = $xpath->query("dfrn:request/text()", $relocation)->item(0)->nodeValue;
1835                 $relocate["confirm"] = $xpath->query("dfrn:confirm/text()", $relocation)->item(0)->nodeValue;
1836                 $relocate["notify"] = $xpath->query("dfrn:notify/text()", $relocation)->item(0)->nodeValue;
1837                 $relocate["poll"] = $xpath->query("dfrn:poll/text()", $relocation)->item(0)->nodeValue;
1838                 $relocate["sitepubkey"] = $xpath->query("dfrn:sitepubkey/text()", $relocation)->item(0)->nodeValue;
1839
1840                 if (($relocate["avatar"] == "") && ($relocate["photo"] != "")) {
1841                         $relocate["avatar"] = $relocate["photo"];
1842                 }
1843
1844                 if ($relocate["addr"] == "") {
1845                         $relocate["addr"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$3@$2", $relocate["url"]);
1846                 }
1847
1848                 // update contact
1849                 $r = q(
1850                         "SELECT `photo`, `url` FROM `contact` WHERE `id` = %d AND `uid` = %d",
1851                         intval($importer["id"]),
1852                         intval($importer["importer_uid"])
1853                 );
1854
1855                 if (!DBA::isResult($r)) {
1856                         Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
1857                         return false;
1858                 }
1859
1860                 $old = $r[0];
1861
1862                 // Update the contact table. We try to find every entry.
1863                 $fields = ['name' => $relocate["name"], 'avatar' => $relocate["avatar"],
1864                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1865                         'addr' => $relocate["addr"], 'request' => $relocate["request"],
1866                         'confirm' => $relocate["confirm"], 'notify' => $relocate["notify"],
1867                         'poll' => $relocate["poll"], 'site-pubkey' => $relocate["sitepubkey"]];
1868                 $condition = ["(`id` = ?) OR (`nurl` = ?)", $importer["id"], Strings::normaliseLink($old["url"])];
1869
1870                 DBA::update('contact', $fields, $condition);
1871
1872                 Contact::updateAvatar($importer["id"], $relocate["avatar"], true);
1873
1874                 Logger::log('Contacts are updated.');
1875
1876                 /// @TODO
1877                 /// merge with current record, current contents have priority
1878                 /// update record, set url-updated
1879                 /// update profile photos
1880                 /// schedule a scan?
1881                 return true;
1882         }
1883
1884         /**
1885          * Updates an item
1886          *
1887          * @param array $current   the current item record
1888          * @param array $item      the new item record
1889          * @param array $importer  Record of the importer user mixed with contact of the content
1890          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
1891          * @return mixed
1892          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1893          * @todo  set proper type-hints (array?)
1894          */
1895         private static function updateContent($current, $item, $importer, $entrytype)
1896         {
1897                 $changed = false;
1898
1899                 if (self::isEditedTimestampNewer($current, $item)) {
1900                         // do not accept (ignore) an earlier edit than one we currently have.
1901                         if (DateTimeFormat::utc($item["edited"]) < $current["edited"]) {
1902                                 return false;
1903                         }
1904
1905                         $fields = ['title' => $item['title'] ?? '', 'body' => $item['body'] ?? '',
1906                                         'changed' => DateTimeFormat::utcNow(),
1907                                         'edited' => DateTimeFormat::utc($item["edited"])];
1908
1909                         $condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
1910                         Item::update($fields, $condition);
1911
1912                         $changed = true;
1913                 }
1914                 return $changed;
1915         }
1916
1917         /**
1918          * Detects the entry type of the item
1919          *
1920          * @param array $importer Record of the importer user mixed with contact of the content
1921          * @param array $item     the new item record
1922          *
1923          * @return int Is it a toplevel entry, a comment or a relayed comment?
1924          * @throws \Exception
1925          * @todo  set proper type-hints (array?)
1926          */
1927         private static function getEntryType($importer, $item)
1928         {
1929                 if ($item["parent-uri"] != $item["uri"]) {
1930                         $community = false;
1931
1932                         if ($importer["page-flags"] == User::PAGE_FLAGS_COMMUNITY || $importer["page-flags"] == User::PAGE_FLAGS_PRVGROUP) {
1933                                 $sql_extra = "";
1934                                 $community = true;
1935                                 Logger::log("possible community action");
1936                         } else {
1937                                 $sql_extra = " AND `contact`.`self` AND `item`.`wall` ";
1938                         }
1939
1940                         // was the top-level post for this action written by somebody on this site?
1941                         // Specifically, the recipient?
1942
1943                         $is_a_remote_action = false;
1944
1945                         $parent = Item::selectFirst(['parent-uri'], ['uri' => $item["parent-uri"]]);
1946                         if (DBA::isResult($parent)) {
1947                                 $r = q(
1948                                         "SELECT `item`.`forum_mode`, `item`.`wall` FROM `item`
1949                                         INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
1950                                         WHERE `item`.`uri` = '%s' AND (`item`.`parent-uri` = '%s' OR `item`.`thr-parent` = '%s')
1951                                         AND `item`.`uid` = %d
1952                                         $sql_extra
1953                                         LIMIT 1",
1954                                         DBA::escape($parent["parent-uri"]),
1955                                         DBA::escape($parent["parent-uri"]),
1956                                         DBA::escape($parent["parent-uri"]),
1957                                         intval($importer["importer_uid"])
1958                                 );
1959                                 if (DBA::isResult($r)) {
1960                                         $is_a_remote_action = true;
1961                                 }
1962                         }
1963
1964                         /*
1965                          * Does this have the characteristics of a community or private group action?
1966                          * If it's an action to a wall post on a community/prvgroup page it's a
1967                          * valid community action. Also forum_mode makes it valid for sure.
1968                          * If neither, it's not.
1969                          */
1970                         if ($is_a_remote_action && $community && (!$r[0]["forum_mode"]) && (!$r[0]["wall"])) {
1971                                 $is_a_remote_action = false;
1972                                 Logger::log("not a community action");
1973                         }
1974
1975                         if ($is_a_remote_action) {
1976                                 return DFRN::REPLY_RC;
1977                         } else {
1978                                 return DFRN::REPLY;
1979                         }
1980                 } else {
1981                         return DFRN::TOP_LEVEL;
1982                 }
1983         }
1984
1985         /**
1986          * Send a "poke"
1987          *
1988          * @param array $item      The new item record
1989          * @param array $importer  Record of the importer user mixed with contact of the content
1990          * @return void
1991          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1992          * @todo  set proper type-hints (array?)
1993          */
1994         private static function doPoke(array $item, array $importer)
1995         {
1996                 $verb = urldecode(substr($item["verb"], strpos($item["verb"], "#")+1));
1997                 if (!$verb) {
1998                         return;
1999                 }
2000                 $xo = XML::parseString($item["object"]);
2001
2002                 if (($xo->type == Activity\ObjectType::PERSON) && ($xo->id)) {
2003                         // somebody was poked/prodded. Was it me?
2004                         $Blink = '';
2005                         foreach ($xo->link as $l) {
2006                                 $atts = $l->attributes();
2007                                 switch ($atts["rel"]) {
2008                                         case "alternate":
2009                                                 $Blink = $atts["href"];
2010                                                 break;
2011                                         default:
2012                                                 break;
2013                                 }
2014                         }
2015
2016                         if ($Blink && Strings::compareLink($Blink, DI::baseUrl() . "/profile/" . $importer["nickname"])) {
2017                                 $author = DBA::selectFirst('contact', ['name', 'thumb', 'url'], ['id' => $item['author-id']]);
2018
2019                                 $parent = Item::selectFirst(['id'], ['uri' => $item['parent-uri'], 'uid' => $importer["importer_uid"]]);
2020                                 $item['parent'] = $parent['id'];
2021
2022                                 // send a notification
2023                                 notification(
2024                                         [
2025                                         "type"         => Type::POKE,
2026                                         "notify_flags" => $importer["notify-flags"],
2027                                         "language"     => $importer["language"],
2028                                         "to_name"      => $importer["username"],
2029                                         "to_email"     => $importer["email"],
2030                                         "uid"          => $importer["importer_uid"],
2031                                         "item"         => $item,
2032                                         "link"         => DI::baseUrl()."/display/".urlencode($item['guid']),
2033                                         "source_name"  => $author["name"],
2034                                         "source_link"  => $author["url"],
2035                                         "source_photo" => $author["thumb"],
2036                                         "verb"         => $item["verb"],
2037                                         "otype"        => "person",
2038                                         "activity"     => $verb,
2039                                         "parent"       => $item['parent']]
2040                                 );
2041                         }
2042                 }
2043         }
2044
2045         /**
2046          * Processes several actions, depending on the verb
2047          *
2048          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2049          * @param array $importer  Record of the importer user mixed with contact of the content
2050          * @param array $item      the new item record
2051          * @param bool  $is_like   Is the verb a "like"?
2052          *
2053          * @return bool Should the processing of the entries be continued?
2054          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2055          * @todo  set proper type-hints (array?)
2056          */
2057         private static function processVerbs($entrytype, $importer, &$item, &$is_like)
2058         {
2059                 Logger::log("Process verb ".$item["verb"]." and object-type ".$item["object-type"]." for entrytype ".$entrytype, Logger::DEBUG);
2060
2061                 if (($entrytype == DFRN::TOP_LEVEL) && !empty($importer['id'])) {
2062                         // The filling of the the "contact" variable is done for legcy reasons
2063                         // The functions below are partly used by ostatus.php as well - where we have this variable
2064                         $contact = Contact::selectFirst([], ['id' => $importer['id']]);
2065
2066                         $activity = DI::activity();
2067
2068                         // Big question: Do we need these functions? They were part of the "consume_feed" function.
2069                         // This function once was responsible for DFRN and OStatus.
2070                         if ($activity->match($item["verb"], Activity::FOLLOW)) {
2071                                 Logger::log("New follower");
2072                                 Contact::addRelationship($importer, $contact, $item);
2073                                 return false;
2074                         }
2075                         if ($activity->match($item["verb"], Activity::UNFOLLOW)) {
2076                                 Logger::log("Lost follower");
2077                                 Contact::removeFollower($importer, $contact, $item);
2078                                 return false;
2079                         }
2080                         if ($activity->match($item["verb"], Activity::REQ_FRIEND)) {
2081                                 Logger::log("New friend request");
2082                                 Contact::addRelationship($importer, $contact, $item, true);
2083                                 return false;
2084                         }
2085                         if ($activity->match($item["verb"], Activity::UNFRIEND)) {
2086                                 Logger::log("Lost sharer");
2087                                 Contact::removeSharer($importer, $contact, $item);
2088                                 return false;
2089                         }
2090                 } else {
2091                         if (($item["verb"] == Activity::LIKE)
2092                                 || ($item["verb"] == Activity::DISLIKE)
2093                                 || ($item["verb"] == Activity::ATTEND)
2094                                 || ($item["verb"] == Activity::ATTENDNO)
2095                                 || ($item["verb"] == Activity::ATTENDMAYBE)
2096                                 || ($item["verb"] == Activity::ANNOUNCE)
2097                         ) {
2098                                 $is_like = true;
2099                                 $item["gravity"] = GRAVITY_ACTIVITY;
2100                                 // only one like or dislike per person
2101                                 // splitted into two queries for performance issues
2102                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2103                                         'verb' => $item["verb"], 'parent-uri' => $item["parent-uri"]];
2104                                 if (Item::exists($condition)) {
2105                                         return false;
2106                                 }
2107
2108                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2109                                         'verb' => $item["verb"], 'thr-parent' => $item["parent-uri"]];
2110                                 if (Item::exists($condition)) {
2111                                         return false;
2112                                 }
2113
2114                                 // The owner of an activity must be the author
2115                                 $item["owner-name"] = $item["author-name"];
2116                                 $item["owner-link"] = $item["author-link"];
2117                                 $item["owner-avatar"] = $item["author-avatar"];
2118                                 $item["owner-id"] = $item["author-id"];
2119                         } else {
2120                                 $is_like = false;
2121                         }
2122
2123                         if (($item["verb"] == Activity::TAG) && ($item["object-type"] == Activity\ObjectType::TAGTERM)) {
2124                                 $xo = XML::parseString($item["object"]);
2125                                 $xt = XML::parseString($item["target"]);
2126
2127                                 if ($xt->type == Activity\ObjectType::NOTE) {
2128                                         $item_tag = Item::selectFirst(['id', 'uri-id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
2129
2130                                         if (!DBA::isResult($item_tag)) {
2131                                                 Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2132                                                 return false;
2133                                         }
2134
2135                                         // extract tag, if not duplicate, add to parent item
2136                                         if ($xo->content) {
2137                                                 Tag::store($item_tag['uri-id'], Tag::HASHTAG, $xo->content);
2138                                         }
2139                                 }
2140                         }
2141                 }
2142                 return true;
2143         }
2144
2145         /**
2146          * Processes the link elements
2147          *
2148          * @param object $links link elements
2149          * @param array  $item  the item record
2150          * @return void
2151          * @todo set proper type-hints
2152          */
2153         private static function parseLinks($links, &$item)
2154         {
2155                 $rel = "";
2156                 $href = "";
2157                 $type = "";
2158                 $length = "0";
2159                 $title = "";
2160                 foreach ($links as $link) {
2161                         foreach ($link->attributes as $attributes) {
2162                                 switch ($attributes->name) {
2163                                         case "href"  : $href   = $attributes->textContent; break;
2164                                         case "rel"   : $rel    = $attributes->textContent; break;
2165                                         case "type"  : $type   = $attributes->textContent; break;
2166                                         case "length": $length = $attributes->textContent; break;
2167                                         case "title" : $title  = $attributes->textContent; break;
2168                                 }
2169                         }
2170                         if (($rel != "") && ($href != "")) {
2171                                 switch ($rel) {
2172                                         case "alternate":
2173                                                 $item["plink"] = $href;
2174                                                 break;
2175                                         case "enclosure":
2176                                                 if (!empty($item["attach"])) {
2177                                                         $item["attach"] .= ",";
2178                                                 } else {
2179                                                         $item["attach"] = "";
2180                                                 }
2181
2182                                                 $item["attach"] .= Post\Media::getAttachElement($href, $length, $type, $title);
2183                                                 break;
2184                                 }
2185                         }
2186                 }
2187         }
2188
2189         /**
2190          * Checks if an incoming message is wanted
2191          *
2192          * @param array $item
2193          * @return boolean Is the message wanted?
2194          */
2195         private static function isSolicitedMessage(array $item)
2196         {
2197                 if (DBA::exists('contact', ["`nurl` = ? AND `uid` != ? AND `rel` IN (?, ?)",
2198                         Strings::normaliseLink($item["author-link"]), 0, Contact::FRIEND, Contact::SHARING])) {
2199                         Logger::info('Author has got followers - accepted', ['uri' => $item['uri'], 'author' => $item["author-link"]]);
2200                         return true;
2201                 }
2202
2203                 $taglist = Tag::getByURIId($item['uri-id'], [Tag::HASHTAG]);
2204                 $tags = array_column($taglist, 'name');
2205                 return Relay::isSolicitedPost($tags, $item['body'], $item['author-id'], $item['uri'], Protocol::DFRN);
2206         }
2207
2208         /**
2209          * Processes the entry elements which contain the items and comments
2210          *
2211          * @param array  $header   Array of the header elements that always stay the same
2212          * @param object $xpath    XPath object
2213          * @param object $entry    entry elements
2214          * @param array  $importer Record of the importer user mixed with contact of the content
2215          * @param string $xml      xml
2216          * @return void
2217          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2218          * @throws \ImagickException
2219          * @todo  Add type-hints
2220          */
2221         private static function processEntry($header, $xpath, $entry, $importer, $xml)
2222         {
2223                 Logger::log("Processing entries");
2224
2225                 $item = $header;
2226
2227                 $item["protocol"] = Conversation::PARCEL_DFRN;
2228
2229                 $item["source"] = $xml;
2230
2231                 // Get the uri
2232                 $item["uri"] = XML::getFirstNodeValue($xpath, "atom:id/text()", $entry);
2233
2234                 $item["edited"] = XML::getFirstNodeValue($xpath, "atom:updated/text()", $entry);
2235
2236                 $current = Item::selectFirst(['id', 'uid', 'edited', 'body'],
2237                         ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]]
2238                 );
2239                 // Is there an existing item?
2240                 if (DBA::isResult($current) && !self::isEditedTimestampNewer($current, $item)) {
2241                         Logger::log("Item ".$item["uri"]." (".$item['edited'].") already existed.", Logger::DEBUG);
2242                         return;
2243                 }
2244
2245                 // Fetch the owner
2246                 $owner = self::fetchauthor($xpath, $entry, $importer, "dfrn:owner", true, $xml);
2247
2248                 $owner_unknown = (isset($owner["contact-unknown"]) && $owner["contact-unknown"]);
2249
2250                 $item["owner-name"] = $owner["name"];
2251                 $item["owner-link"] = $owner["link"];
2252                 $item["owner-avatar"] = $owner["avatar"];
2253                 $item["owner-id"] = Contact::getIdForURL($owner["link"], 0);
2254
2255                 // fetch the author
2256                 $author = self::fetchauthor($xpath, $entry, $importer, "atom:author", true, $xml);
2257
2258                 $item["author-name"] = $author["name"];
2259                 $item["author-link"] = $author["link"];
2260                 $item["author-avatar"] = $author["avatar"];
2261                 $item["author-id"] = Contact::getIdForURL($author["link"], 0);
2262
2263                 $item["title"] = XML::getFirstNodeValue($xpath, "atom:title/text()", $entry);
2264
2265                 $item["created"] = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2266
2267                 $item["body"] = XML::getFirstNodeValue($xpath, "dfrn:env/text()", $entry);
2268                 $item["body"] = str_replace([' ',"\t","\r","\n"], ['','','',''], $item["body"]);
2269
2270                 $item["body"] = Strings::base64UrlDecode($item["body"]);
2271
2272                 $item["body"] = BBCode::limitBodySize($item["body"]);
2273
2274                 /// @todo We should check for a repeated post and if we know the repeated author.
2275
2276                 // We don't need the content element since "dfrn:env" is always present
2277                 //$item["body"] = $xpath->query("atom:content/text()", $entry)->item(0)->nodeValue;
2278
2279                 $item["location"] = XML::getFirstNodeValue($xpath, "dfrn:location/text()", $entry);
2280
2281                 $item["coord"] = XML::getFirstNodeValue($xpath, "georss:point", $entry);
2282
2283                 $item["private"] = XML::getFirstNodeValue($xpath, "dfrn:private/text()", $entry);
2284
2285                 $unlisted = XML::getFirstNodeValue($xpath, "dfrn:unlisted/text()", $entry);
2286                 if (!empty($unlisted) && ($item['private'] != Item::PRIVATE)) {
2287                         $item['private'] = Item::UNLISTED;
2288                 }
2289
2290                 $item["extid"] = XML::getFirstNodeValue($xpath, "dfrn:extid/text()", $entry);
2291
2292                 if (XML::getFirstNodeValue($xpath, "dfrn:bookmark/text()", $entry) == "true") {
2293                         $item["post-type"] = Item::PT_PAGE;
2294                 }
2295
2296                 $notice_info = $xpath->query("statusnet:notice_info", $entry);
2297                 if ($notice_info && ($notice_info->length > 0)) {
2298                         foreach ($notice_info->item(0)->attributes as $attributes) {
2299                                 if ($attributes->name == "source") {
2300                                         $item["app"] = strip_tags($attributes->textContent);
2301                                 }
2302                         }
2303                 }
2304
2305                 $item["guid"] = XML::getFirstNodeValue($xpath, "dfrn:diaspora_guid/text()", $entry);
2306
2307                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
2308
2309                 Tag::storeFromBody($item['uri-id'], $item["body"]);
2310
2311                 // We store the data from "dfrn:diaspora_signature" in a different table, this is done in "Item::insert"
2312                 $dsprsig = XML::unescape(XML::getFirstNodeValue($xpath, "dfrn:diaspora_signature/text()", $entry));
2313                 if ($dsprsig != "") {
2314                         $signature = json_decode(base64_decode($dsprsig));
2315                         // We don't store the old style signatures anymore that also contained the "signature" and "signer"
2316                         if (!empty($signature->signed_text) && empty($signature->signature) && empty($signature->signer)) {
2317                                 $item["diaspora_signed_text"] = $signature->signed_text;
2318                         }
2319                 }
2320
2321                 $item["verb"] = XML::getFirstNodeValue($xpath, "activity:verb/text()", $entry);
2322
2323                 if (XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry) != "") {
2324                         $item["object-type"] = XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry);
2325                 }
2326
2327                 $object = $xpath->query("activity:object", $entry)->item(0);
2328                 $item["object"] = self::transformActivity($xpath, $object, "object");
2329
2330                 if (trim($item["object"]) != "") {
2331                         $r = XML::parseString($item["object"]);
2332                         if (isset($r->type)) {
2333                                 $item["object-type"] = $r->type;
2334                         }
2335                 }
2336
2337                 $target = $xpath->query("activity:target", $entry)->item(0);
2338                 $item["target"] = self::transformActivity($xpath, $target, "target");
2339
2340                 $categories = $xpath->query("atom:category", $entry);
2341                 if ($categories) {
2342                         foreach ($categories as $category) {
2343                                 $term = "";
2344                                 $scheme = "";
2345                                 foreach ($category->attributes as $attributes) {
2346                                         if ($attributes->name == "term") {
2347                                                 $term = $attributes->textContent;
2348                                         }
2349
2350                                         if ($attributes->name == "scheme") {
2351                                                 $scheme = $attributes->textContent;
2352                                         }
2353                                 }
2354
2355                                 if (($term != "") && ($scheme != "")) {
2356                                         $parts = explode(":", $scheme);
2357                                         if ((count($parts) >= 4) && (array_shift($parts) == "X-DFRN")) {
2358                                                 $termurl = array_pop($parts);
2359                                                 $termurl = array_pop($parts) . ':' . $termurl;
2360                                                 Tag::store($item['uri-id'], Tag::IMPLICIT_MENTION, $term, $termurl);
2361                                         }
2362                                 }
2363                         }
2364                 }
2365
2366                 $links = $xpath->query("atom:link", $entry);
2367                 if ($links) {
2368                         self::parseLinks($links, $item);
2369                 }
2370
2371                 $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
2372
2373                 $conv = $xpath->query('ostatus:conversation', $entry);
2374                 if (is_object($conv->item(0))) {
2375                         foreach ($conv->item(0)->attributes as $attributes) {
2376                                 if ($attributes->name == "ref") {
2377                                         $item['conversation-uri'] = $attributes->textContent;
2378                                 }
2379                                 if ($attributes->name == "href") {
2380                                         $item['conversation-href'] = $attributes->textContent;
2381                                 }
2382                         }
2383                 }
2384
2385                 // Is it a reply or a top level posting?
2386                 $item["parent-uri"] = $item["uri"];
2387
2388                 $inreplyto = $xpath->query("thr:in-reply-to", $entry);
2389                 if (is_object($inreplyto->item(0))) {
2390                         foreach ($inreplyto->item(0)->attributes as $attributes) {
2391                                 if ($attributes->name == "ref") {
2392                                         $item["parent-uri"] = $attributes->textContent;
2393                                 }
2394                         }
2395                 }
2396
2397                 // Check if the message is wanted
2398                 if (($importer["importer_uid"] == 0) && ($item['uri'] == $item['parent-uri'])) {
2399                         if (!self::isSolicitedMessage($item)) {
2400                                 DBA::delete('item-uri', ['uri' => $item['uri']]);
2401                                 return 403;
2402                         }
2403                 }
2404
2405                 // Get the type of the item (Top level post, reply or remote reply)
2406                 $entrytype = self::getEntryType($importer, $item);
2407
2408                 // Now assign the rest of the values that depend on the type of the message
2409                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2410                         if (!isset($item["object-type"])) {
2411                                 $item["object-type"] = Activity\ObjectType::COMMENT;
2412                         }
2413
2414                         if ($item["contact-id"] != $owner["contact-id"]) {
2415                                 $item["contact-id"] = $owner["contact-id"];
2416                         }
2417
2418                         if (($item["network"] != $owner["network"]) && ($owner["network"] != "")) {
2419                                 $item["network"] = $owner["network"];
2420                         }
2421
2422                         if ($item["contact-id"] != $author["contact-id"]) {
2423                                 $item["contact-id"] = $author["contact-id"];
2424                         }
2425
2426                         if (($item["network"] != $author["network"]) && ($author["network"] != "")) {
2427                                 $item["network"] = $author["network"];
2428                         }
2429                 }
2430
2431                 // Ensure to have the correct share data
2432                 $item = Item::addShareDataFromOriginal($item);
2433
2434                 if ($entrytype == DFRN::REPLY_RC) {
2435                         $item["wall"] = 1;
2436                 } elseif ($entrytype == DFRN::TOP_LEVEL) {
2437                         if (!isset($item["object-type"])) {
2438                                 $item["object-type"] = Activity\ObjectType::NOTE;
2439                         }
2440
2441                         // Is it an event?
2442                         if (($item["object-type"] == Activity\ObjectType::EVENT) && !$owner_unknown) {
2443                                 Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
2444                                 $ev = Event::fromBBCode($item["body"]);
2445                                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
2446                                         Logger::log("Event in item ".$item["uri"]." was found.", Logger::DEBUG);
2447                                         $ev["cid"]     = $importer["id"];
2448                                         $ev["uid"]     = $importer["importer_uid"];
2449                                         $ev["uri"]     = $item["uri"];
2450                                         $ev["edited"]  = $item["edited"];
2451                                         $ev["private"] = $item["private"];
2452                                         $ev["guid"]    = $item["guid"];
2453                                         $ev["plink"]   = $item["plink"];
2454
2455                                         $condition = ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]];
2456                                         $event = DBA::selectFirst('event', ['id'], $condition);
2457                                         if (DBA::isResult($event)) {
2458                                                 $ev["id"] = $event["id"];
2459                                         }
2460
2461                                         $event_id = Event::store($ev);
2462                                         Logger::log("Event ".$event_id." was stored", Logger::DEBUG);
2463                                         return;
2464                                 }
2465                         }
2466                 }
2467
2468                 if (!self::processVerbs($entrytype, $importer, $item, $is_like)) {
2469                         Logger::log("Exiting because 'processVerbs' told us so", Logger::DEBUG);
2470                         return;
2471                 }
2472
2473                 // This check is done here to be able to receive connection requests in "processVerbs"
2474                 if (($entrytype == DFRN::TOP_LEVEL) && $owner_unknown) {
2475                         Logger::log("Item won't be stored because user " . $importer["importer_uid"] . " doesn't follow " . $item["owner-link"] . ".", Logger::DEBUG);
2476                         return;
2477                 }
2478
2479
2480                 // Update content if 'updated' changes
2481                 if (DBA::isResult($current)) {
2482                         if (self::updateContent($current, $item, $importer, $entrytype)) {
2483                                 Logger::log("Item ".$item["uri"]." was updated.", Logger::DEBUG);
2484                         } else {
2485                                 Logger::log("Item " . $item["uri"] . " already existed.", Logger::DEBUG);
2486                         }
2487                         return;
2488                 }
2489
2490                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2491                         // Will be overwritten for sharing accounts in Item::insert
2492                         if (empty($item['post-type']) && ($entrytype == DFRN::REPLY)) {
2493                                 $item['post-type'] = Item::PT_COMMENT;
2494                         }
2495
2496                         $posted_id = Item::insert($item);
2497                         if ($posted_id) {
2498                                 Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
2499
2500                                 if ($item['uid'] == 0) {
2501                                         Item::distribute($posted_id);
2502                                 }
2503
2504                                 return true;
2505                         }
2506                 } else { // $entrytype == DFRN::TOP_LEVEL
2507                         if (($importer["uid"] == 0) && ($importer["importer_uid"] != 0)) {
2508                                 Logger::log("Contact ".$importer["id"]." isn't known to user ".$importer["importer_uid"].". The post will be ignored.", Logger::DEBUG);
2509                                 return;
2510                         }
2511                         if (!Strings::compareLink($item["owner-link"], $importer["url"])) {
2512                                 /*
2513                                  * The item owner info is not our contact. It's OK and is to be expected if this is a tgroup delivery,
2514                                  * but otherwise there's a possible data mixup on the sender's system.
2515                                  * the tgroup delivery code called from Item::insert will correct it if it's a forum,
2516                                  * but we're going to unconditionally correct it here so that the post will always be owned by our contact.
2517                                  */
2518                                 Logger::log('Correcting item owner.', Logger::DEBUG);
2519                                 $item["owner-link"] = $importer["url"];
2520                                 $item["owner-id"] = Contact::getIdForURL($importer["url"], 0);
2521                         }
2522
2523                         if (($importer["rel"] == Contact::FOLLOWER) && (!self::tgroupCheck($importer["importer_uid"], $item))) {
2524                                 Logger::log("Contact ".$importer["id"]." is only follower and tgroup check was negative.", Logger::DEBUG);
2525                                 return;
2526                         }
2527
2528                         // This is my contact on another system, but it's really me.
2529                         // Turn this into a wall post.
2530                         $notify = Item::isRemoteSelf($importer, $item);
2531
2532                         $posted_id = Item::insert($item, $notify);
2533
2534                         if ($notify) {
2535                                 $posted_id = $notify;
2536                         }
2537
2538                         Logger::log("Item was stored with id ".$posted_id, Logger::DEBUG);
2539
2540                         if ($item['uid'] == 0) {
2541                                 Item::distribute($posted_id);
2542                         }
2543
2544                         if (stristr($item["verb"], Activity::POKE)) {
2545                                 $item['id'] = $posted_id;
2546                                 self::doPoke($item, $importer);
2547                         }
2548                 }
2549         }
2550
2551         /**
2552          * Deletes items
2553          *
2554          * @param object $xpath    XPath object
2555          * @param object $deletion deletion elements
2556          * @param array  $importer Record of the importer user mixed with contact of the content
2557          * @return void
2558          * @throws \Exception
2559          * @todo  set proper type-hints
2560          */
2561         private static function processDeletion($xpath, $deletion, $importer)
2562         {
2563                 Logger::log("Processing deletions");
2564                 $uri = null;
2565
2566                 foreach ($deletion->attributes as $attributes) {
2567                         if ($attributes->name == "ref") {
2568                                 $uri = $attributes->textContent;
2569                         }
2570                 }
2571
2572                 if (!$uri || !$importer["id"]) {
2573                         return false;
2574                 }
2575
2576                 $condition = ['uri' => $uri, 'uid' => $importer["importer_uid"]];
2577                 $item = Item::selectFirst(['id', 'parent', 'contact-id', 'file', 'deleted', 'gravity'], $condition);
2578                 if (!DBA::isResult($item)) {
2579                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " wasn't found.", Logger::DEBUG);
2580                         return;
2581                 }
2582
2583                 if (strstr($item['file'], '[')) {
2584                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " is filed. So it won't be deleted.", Logger::DEBUG);
2585                         return;
2586                 }
2587
2588                 // When it is a starting post it has to belong to the person that wants to delete it
2589                 if (($item['gravity'] == GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2590                         Logger::log("Item with uri " . $uri . " don't belong to contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2591                         return;
2592                 }
2593
2594                 // Comments can be deleted by the thread owner or comment owner
2595                 if (($item['gravity'] != GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2596                         $condition = ['id' => $item['parent'], 'contact-id' => $importer["id"]];
2597                         if (!Item::exists($condition)) {
2598                                 Logger::log("Item with uri " . $uri . " wasn't found or mustn't be deleted by contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2599                                 return;
2600                         }
2601                 }
2602
2603                 if ($item["deleted"]) {
2604                         return;
2605                 }
2606
2607                 Logger::log('deleting item '.$item['id'].' uri='.$uri, Logger::DEBUG);
2608
2609                 Item::markForDeletion(['id' => $item['id']]);
2610         }
2611
2612         /**
2613          * Imports a DFRN message
2614          *
2615          * @param string $xml          The DFRN message
2616          * @param array  $importer     Record of the importer user mixed with contact of the content
2617          * @param bool   $sort_by_date Is used when feeds are polled
2618          * @return integer Import status
2619          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2620          * @throws \ImagickException
2621          * @todo  set proper type-hints
2622          */
2623         public static function import($xml, $importer, $sort_by_date = false)
2624         {
2625                 if ($xml == "") {
2626                         return 400;
2627                 }
2628
2629                 $doc = new DOMDocument();
2630                 @$doc->loadXML($xml);
2631
2632                 $xpath = new DOMXPath($doc);
2633                 $xpath->registerNamespace("atom", ActivityNamespace::ATOM1);
2634                 $xpath->registerNamespace("thr", ActivityNamespace::THREAD);
2635                 $xpath->registerNamespace("at", ActivityNamespace::TOMB);
2636                 $xpath->registerNamespace("media", ActivityNamespace::MEDIA);
2637                 $xpath->registerNamespace("dfrn", ActivityNamespace::DFRN);
2638                 $xpath->registerNamespace("activity", ActivityNamespace::ACTIVITY);
2639                 $xpath->registerNamespace("georss", ActivityNamespace::GEORSS);
2640                 $xpath->registerNamespace("poco", ActivityNamespace::POCO);
2641                 $xpath->registerNamespace("ostatus", ActivityNamespace::OSTATUS);
2642                 $xpath->registerNamespace("statusnet", ActivityNamespace::STATUSNET);
2643
2644                 $header = [];
2645                 $header["uid"] = $importer["importer_uid"];
2646                 $header["network"] = Protocol::DFRN;
2647                 $header["wall"] = 0;
2648                 $header["origin"] = 0;
2649                 $header["contact-id"] = $importer["id"];
2650
2651                 // Update the contact table if the data has changed
2652
2653                 // The "atom:author" is only present in feeds
2654                 if ($xpath->query("/atom:feed/atom:author")->length > 0) {
2655                         self::fetchauthor($xpath, $doc->firstChild, $importer, "atom:author", false, $xml);
2656                 }
2657
2658                 // Only the "dfrn:owner" in the head section contains all data
2659                 if ($xpath->query("/atom:feed/dfrn:owner")->length > 0) {
2660                         self::fetchauthor($xpath, $doc->firstChild, $importer, "dfrn:owner", false, $xml);
2661                 }
2662
2663                 Logger::log("Import DFRN message for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2664
2665                 // is it a public forum? Private forums aren't exposed with this method
2666                 $forum = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:community/text()"));
2667
2668                 // The account type is new since 3.5.1
2669                 if ($xpath->query("/atom:feed/dfrn:account_type")->length > 0) {
2670                         // Hint: We are using separate update calls for uid=0 and uid!=0 since a combined call is bad for the database performance
2671
2672                         $accounttype = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:account_type/text()"));
2673
2674                         if ($accounttype != $importer["contact-type"]) {
2675                                 DBA::update('contact', ['contact-type' => $accounttype], ['id' => $importer['id']]);
2676
2677                                 // Updating the public contact as well
2678                                 DBA::update('contact', ['contact-type' => $accounttype], ['uid' => 0, 'nurl' => $importer['nurl']]);
2679                         }
2680                         // A forum contact can either have set "forum" or "prv" - but not both
2681                         if ($accounttype == User::ACCOUNT_TYPE_COMMUNITY) {
2682                                 // It's a forum, so either set the public or private forum flag
2683                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `id` = ?', $forum, !$forum, $importer['id']];
2684                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2685
2686                                 // Updating the public contact as well
2687                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `uid` = 0 AND `nurl` = ?', $forum, !$forum, $importer['nurl']];
2688                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2689                         } else {
2690                                 // It's not a forum, so remove the flags
2691                                 $condition = ['(`forum` OR `prv`) AND `id` = ?', $importer['id']];
2692                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2693
2694                                 // Updating the public contact as well
2695                                 $condition = ['(`forum` OR `prv`) AND `uid` = 0 AND `nurl` = ?', $importer['nurl']];
2696                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2697                         }
2698                 } elseif ($forum != $importer["forum"]) { // Deprecated since 3.5.1
2699                         $condition = ['`forum` != ? AND `id` = ?', $forum, $importer["id"]];
2700                         DBA::update('contact', ['forum' => $forum], $condition);
2701
2702                         // Updating the public contact as well
2703                         $condition = ['`forum` != ? AND `uid` = 0 AND `nurl` = ?', $forum, $importer['nurl']];
2704                         DBA::update('contact', ['forum' => $forum], $condition);
2705                 }
2706
2707
2708                 // We are processing relocations even if we are ignoring a contact
2709                 $relocations = $xpath->query("/atom:feed/dfrn:relocate");
2710                 foreach ($relocations as $relocation) {
2711                         self::processRelocation($xpath, $relocation, $importer);
2712                 }
2713
2714                 if (($importer["uid"] != 0) && !$importer["readonly"]) {
2715                         $mails = $xpath->query("/atom:feed/dfrn:mail");
2716                         foreach ($mails as $mail) {
2717                                 self::processMail($xpath, $mail, $importer);
2718                         }
2719
2720                         $suggestions = $xpath->query("/atom:feed/dfrn:suggest");
2721                         foreach ($suggestions as $suggestion) {
2722                                 self::processSuggestion($xpath, $suggestion, $importer);
2723                         }
2724                 }
2725
2726                 $deletions = $xpath->query("/atom:feed/at:deleted-entry");
2727                 foreach ($deletions as $deletion) {
2728                         self::processDeletion($xpath, $deletion, $importer);
2729                 }
2730
2731                 if (!$sort_by_date) {
2732                         $entries = $xpath->query("/atom:feed/atom:entry");
2733                         foreach ($entries as $entry) {
2734                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2735                         }
2736                 } else {
2737                         $newentries = [];
2738                         $entries = $xpath->query("/atom:feed/atom:entry");
2739                         foreach ($entries as $entry) {
2740                                 $created = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2741                                 $newentries[strtotime($created)] = $entry;
2742                         }
2743
2744                         // Now sort after the publishing date
2745                         ksort($newentries);
2746
2747                         foreach ($newentries as $entry) {
2748                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2749                         }
2750                 }
2751                 Logger::log("Import done for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2752                 return 200;
2753         }
2754
2755         /**
2756          * Returns the activity verb
2757          *
2758          * @param array $item Item array
2759          *
2760          * @return string activity verb
2761          */
2762         private static function constructVerb(array $item)
2763         {
2764                 if ($item['verb']) {
2765                         return $item['verb'];
2766                 }
2767                 return Activity::POST;
2768         }
2769
2770         private static function tgroupCheck($uid, $item)
2771         {
2772                 $mention = false;
2773
2774                 // check that the message originated elsewhere and is a top-level post
2775
2776                 if ($item['wall'] || $item['origin'] || ($item['uri'] != $item['parent-uri'])) {
2777                         return false;
2778                 }
2779
2780                 $user = DBA::selectFirst('user', ['page-flags', 'nickname'], ['uid' => $uid]);
2781                 if (!DBA::isResult($user)) {
2782                         return false;
2783                 }
2784
2785                 $community_page = ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY);
2786                 $prvgroup = ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP);
2787
2788                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
2789
2790                 /*
2791                  * Diaspora uses their own hardwired link URL in @-tags
2792                  * instead of the one we supply with webfinger
2793                  */
2794                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
2795
2796                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2797                 if ($cnt) {
2798                         foreach ($matches as $mtch) {
2799                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2800                                         $mention = true;
2801                                         Logger::log('mention found: ' . $mtch[2]);
2802                                 }
2803                         }
2804                 }
2805
2806                 if (!$mention) {
2807                         return false;
2808                 }
2809
2810                 return $community_page || $prvgroup;
2811         }
2812
2813         /**
2814          * This function returns true if $update has an edited timestamp newer
2815          * than $existing, i.e. $update contains new data which should override
2816          * what's already there.  If there is no timestamp yet, the update is
2817          * assumed to be newer.  If the update has no timestamp, the existing
2818          * item is assumed to be up-to-date.  If the timestamps are equal it
2819          * assumes the update has been seen before and should be ignored.
2820          *
2821          * @param $existing
2822          * @param $update
2823          * @return bool
2824          * @throws \Exception
2825          */
2826         private static function isEditedTimestampNewer($existing, $update)
2827         {
2828                 if (empty($existing['edited'])) {
2829                         return true;
2830                 }
2831                 if (empty($update['edited'])) {
2832                         return false;
2833                 }
2834
2835                 $existing_edited = DateTimeFormat::utc($existing['edited']);
2836                 $update_edited = DateTimeFormat::utc($update['edited']);
2837
2838                 return (strcmp($existing_edited, $update_edited) < 0);
2839         }
2840
2841         /**
2842          * Checks if the given contact url does support DFRN
2843          *
2844          * @param string  $url    profile url
2845          * @return boolean
2846          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2847          * @throws \ImagickException
2848          */
2849         public static function isSupportedByContactUrl($url)
2850         {
2851                 $probe = Probe::uri($url, Protocol::DFRN);
2852                 return $probe['network'] == Protocol::DFRN;
2853         }
2854 }