src/Protocol/DFRN.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol;
  23
  24 use DOMDocument;
  25 use DOMXPath;
  26 use Friendica\App\BaseURL;
  27 use Friendica\Content\Text\BBCode;
  28 use Friendica\Core\Hook;
  29 use Friendica\Core\Logger;
  30 use Friendica\Core\Protocol;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\Contact;
  34 use Friendica\Model\Conversation;
  35 use Friendica\Model\Event;
  36 use Friendica\Model\FContact;
  37 use Friendica\Model\Item;
  38 use Friendica\Model\ItemURI;
  39 use Friendica\Model\Mail;
  40 use Friendica\Model\Notify\Type;
  41 use Friendica\Model\PermissionSet;
  42 use Friendica\Model\Post\Category;
  43 use Friendica\Model\Profile;
  44 use Friendica\Model\Tag;
  45 use Friendica\Model\User;
  46 use Friendica\Network\Probe;
  47 use Friendica\Util\Crypto;
  48 use Friendica\Util\DateTimeFormat;
  49 use Friendica\Util\Images;
  50 use Friendica\Util\Network;
  51 use Friendica\Util\Strings;
  52 use Friendica\Util\XML;
  53
  54 /**
  55  * This class contain functions to create and send DFRN XML files
  56  */
  57 class DFRN
  58 {
  59
  60         const TOP_LEVEL = 0;    // Top level posting
  61         const REPLY = 1;                // Regular reply that is stored locally
  62         const REPLY_RC = 2;     // Reply that will be relayed
  63
  64         /**
  65          * Generates an array of contact and user for DFRN imports
  66          *
  67          * This array contains not only the receiver but also the sender of the message.
  68          *
  69          * @param integer $cid Contact id
  70          * @param integer $uid User id
  71          *
  72          * @return array importer
  73          * @throws \Exception
  74          */
  75         public static function getImporter($cid, $uid = 0)
  76         {
  77                 $condition = ['id' => $cid, 'blocked' => false, 'pending' => false];
  78                 $contact = DBA::selectFirst('contact', [], $condition);
  79                 if (!DBA::isResult($contact)) {
  80                         return [];
  81                 }
  82
  83                 $contact['cpubkey'] = $contact['pubkey'];
  84                 $contact['cprvkey'] = $contact['prvkey'];
  85                 $contact['senderName'] = $contact['name'];
  86
  87                 if ($uid != 0) {
  88                         $condition = ['uid' => $uid, 'account_expired' => false, 'account_removed' => false];
  89                         $user = DBA::selectFirst('user', [], $condition);
  90                         if (!DBA::isResult($user)) {
  91                                 return [];
  92                         }
  93
  94                         $user['importer_uid'] = $user['uid'];
  95                         $user['uprvkey'] = $user['prvkey'];
  96                 } else {
  97                         $user = ['importer_uid' => 0, 'uprvkey' => '', 'timezone' => 'UTC',
  98                                 'nickname' => '', 'sprvkey' => '', 'spubkey' => '',
  99                                 'page-flags' => 0, 'account-type' => 0, 'prvnets' => 0];
 100                 }
 101
 102                 return array_merge($contact, $user);
 103         }
 104
 105         /**
 106          * Generates the atom entries for delivery.php
 107          *
 108          * This function is used whenever content is transmitted via DFRN.
 109          *
 110          * @param array $items Item elements
 111          * @param array $owner Owner record
 112          *
 113          * @return string DFRN entries
 114          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 115          * @throws \ImagickException
 116          * @todo  Find proper type-hints
 117          */
 118         public static function entries($items, $owner)
 119         {
 120                 $doc = new DOMDocument('1.0', 'utf-8');
 121                 $doc->formatOutput = true;
 122
 123                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 124
 125                 if (! count($items)) {
 126                         return trim($doc->saveXML());
 127                 }
 128
 129                 foreach ($items as $item) {
 130                         // These values aren't sent when sending from the queue.
 131                         /// @todo Check if we can set these values from the queue or if they are needed at all.
 132                         $item["entry:comment-allow"] = ($item["entry:comment-allow"] ?? '') ?: true;
 133                         $item["entry:cid"] = $item["entry:cid"] ?? 0;
 134
 135                         $entry = self::entry($doc, "text", $item, $owner, $item["entry:comment-allow"], $item["entry:cid"]);
 136                         if (isset($entry)) {
 137                                 $root->appendChild($entry);
 138                         }
 139                 }
 140
 141                 return trim($doc->saveXML());
 142         }
 143
 144         /**
 145          * Generate an atom feed for the given user
 146          *
 147          * This function is called when another server is pulling data from the user feed.
 148          *
 149          * @param string  $dfrn_id     DFRN ID from the requesting party
 150          * @param string  $owner_nick  Owner nick name
 151          * @param string  $last_update Date of the last update
 152          * @param int     $direction   Can be -1, 0 or 1.
 153          * @param boolean $onlyheader  Output only the header without content? (Default is "no")
 154          *
 155          * @return string DFRN feed entries
 156          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 157          * @throws \ImagickException
 158          */
 159         public static function feed($dfrn_id, $owner_nick, $last_update, $direction = 0, $onlyheader = false)
 160         {
 161                 $a = DI::app();
 162
 163                 $sitefeed    = ((strlen($owner_nick)) ? false : true); // not yet implemented, need to rewrite huge chunks of following logic
 164                 $public_feed = (($dfrn_id) ? false : true);
 165                 $starred     = false;   // not yet implemented, possible security issues
 166                 $converse    = false;
 167
 168                 if ($public_feed && $a->argc > 2) {
 169                         for ($x = 2; $x < $a->argc; $x++) {
 170                                 if ($a->argv[$x] == 'converse') {
 171                                         $converse = true;
 172                                 }
 173                                 if ($a->argv[$x] == 'starred') {
 174                                         $starred = true;
 175                                 }
 176                                 if ($a->argv[$x] == 'category' && $a->argc > ($x + 1) && strlen($a->argv[$x+1])) {
 177                                         $category = $a->argv[$x+1];
 178                                 }
 179                         }
 180                 }
 181
 182                 // default permissions - anonymous user
 183
 184                 $sql_extra = sprintf(" AND `item`.`private` != %s ", Item::PRIVATE);
 185
 186                 $owner = DBA::selectFirst('owner-view', [], ['nickname' => $owner_nick]);
 187                 if (!DBA::isResult($owner)) {
 188                         Logger::log(sprintf('No contact found for nickname=%d', $owner_nick), Logger::WARNING);
 189                         exit();
 190                 }
 191
 192                 $owner_id = $owner['uid'];
 193
 194                 $sql_post_table = "";
 195
 196                 if (! $public_feed) {
 197                         switch ($direction) {
 198                                 case (-1):
 199                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 200                                         break;
 201                                 case 0:
 202                                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 203                                         break;
 204                                 case 1:
 205                                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 206                                         break;
 207                                 default:
 208                                         return false;
 209                                         break; // NOTREACHED
 210                         }
 211
 212                         $r = q(
 213                                 "SELECT * FROM `contact` WHERE NOT `blocked` AND `contact`.`uid` = %d $sql_extra LIMIT 1",
 214                                 intval($owner_id)
 215                         );
 216
 217                         if (! DBA::isResult($r)) {
 218                                 Logger::log(sprintf('No contact found for uid=%d', $owner_id), Logger::WARNING);
 219                                 exit();
 220                         }
 221
 222                         $contact = $r[0];
 223
 224                         $set = PermissionSet::get($owner_id, $contact['id']);
 225
 226                         if (!empty($set)) {
 227                                 $sql_extra = " AND `item`.`psid` IN (" . implode(',', $set) .")";
 228                         } else {
 229                                 $sql_extra = sprintf(" AND `item`.`private` != %s", Item::PRIVATE);
 230                         }
 231                 }
 232
 233                 if ($public_feed) {
 234                         $sort = 'DESC';
 235                 } else {
 236                         $sort = 'ASC';
 237                 }
 238
 239                 if (! strlen($last_update)) {
 240                         $last_update = 'now -30 days';
 241                 }
 242
 243                 if (isset($category)) {
 244                         $sql_post_table = sprintf("INNER JOIN (SELECT `uri-id` FROM `category-view` WHERE `name` = '%s' AND `type` = %d AND `uid` = %d ORDER BY `uri-id` DESC) AS `category` ON `item`.`uri-id` = `category`.`uri-id` ",
 245                                 DBA::escape(Strings::protectSprintf($category)), intval(Category::CATEGORY), intval($owner_id));
 246                 }
 247
 248                 if ($public_feed && ! $converse) {
 249                         $sql_extra .= " AND `contact`.`self` = 1 ";
 250                 }
 251
 252                 $check_date = DateTimeFormat::utc($last_update);
 253
 254                 $r = q(
 255                         "SELECT `item`.`id`
 256                         FROM `item` USE INDEX (`uid_wall_changed`) $sql_post_table
 257                         STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
 258                         WHERE `item`.`uid` = %d AND `item`.`wall` AND `item`.`changed` > '%s'
 259                         AND `item`.`visible` $sql_extra
 260                         ORDER BY `item`.`parent` ".$sort.", `item`.`received` ASC LIMIT 0, 300",
 261                         intval($owner_id),
 262                         DBA::escape($check_date),
 263                         DBA::escape($sort)
 264                 );
 265
 266                 $ids = [];
 267                 foreach ($r as $item) {
 268                         $ids[] = $item['id'];
 269                 }
 270
 271                 if (!empty($ids)) {
 272                         $ret = Item::select(Item::DELIVER_FIELDLIST, ['id' => $ids]);
 273                         $items = Item::inArray($ret);
 274                 } else {
 275                         $items = [];
 276                 }
 277
 278                 /*
 279                  * Will check further below if this actually returned results.
 280                  * We will provide an empty feed if that is the case.
 281                  */
 282
 283                 $doc = new DOMDocument('1.0', 'utf-8');
 284                 $doc->formatOutput = true;
 285
 286                 $alternatelink = $owner['url'];
 287
 288                 if (isset($category)) {
 289                         $alternatelink .= "/category/".$category;
 290                 }
 291
 292                 if ($public_feed) {
 293                         $author = "dfrn:owner";
 294                 } else {
 295                         $author = "author";
 296                 }
 297
 298                 $root = self::addHeader($doc, $owner, $author, $alternatelink, true);
 299
 300                 /// @TODO This hook can't work anymore
 301                 //      \Friendica\Core\Hook::callAll('atom_feed', $atom);
 302
 303                 if (!DBA::isResult($items) || $onlyheader) {
 304                         $atom = trim($doc->saveXML());
 305
 306                         Hook::callAll('atom_feed_end', $atom);
 307
 308                         return $atom;
 309                 }
 310
 311                 foreach ($items as $item) {
 312                         // prevent private email from leaking.
 313                         if ($item['network'] == Protocol::MAIL) {
 314                                 continue;
 315                         }
 316
 317                         // public feeds get html, our own nodes use bbcode
 318
 319                         if ($public_feed) {
 320                                 $type = 'html';
 321                                 // catch any email that's in a public conversation and make sure it doesn't leak
 322                                 if ($item['private'] == Item::PRIVATE) {
 323                                         continue;
 324                                 }
 325                         } else {
 326                                 $type = 'text';
 327                         }
 328
 329                         $entry = self::entry($doc, $type, $item, $owner, true);
 330                         if (isset($entry)) {
 331                                 $root->appendChild($entry);
 332                         }
 333                 }
 334
 335                 $atom = trim($doc->saveXML());
 336
 337                 Hook::callAll('atom_feed_end', $atom);
 338
 339                 return $atom;
 340         }
 341
 342         /**
 343          * Generate an atom entry for a given item id
 344          *
 345          * @param int     $item_id      The item id
 346          * @param boolean $conversation Show the conversation. If false show the single post.
 347          *
 348          * @return string DFRN feed entry
 349          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 350          * @throws \ImagickException
 351          */
 352         public static function itemFeed($item_id, $conversation = false)
 353         {
 354                 if ($conversation) {
 355                         $condition = ['parent' => $item_id];
 356                 } else {
 357                         $condition = ['id' => $item_id];
 358                 }
 359
 360                 $ret = Item::select(Item::DELIVER_FIELDLIST, $condition);
 361                 $items = Item::inArray($ret);
 362                 if (!DBA::isResult($items)) {
 363                         return '';
 364                 }
 365
 366                 $item = $items[0];
 367
 368                 if ($item['uid'] != 0) {
 369                         $owner = User::getOwnerDataById($item['uid']);
 370                         if (!$owner) {
 371                                 return '';
 372                         }
 373                 } else {
 374                         $owner = ['uid' => 0, 'nick' => 'feed-item'];
 375                 }
 376
 377                 $doc = new DOMDocument('1.0', 'utf-8');
 378                 $doc->formatOutput = true;
 379                 $type = 'html';
 380
 381                 if ($conversation) {
 382                         $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 383                         $doc->appendChild($root);
 384
 385                         $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 386                         $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 387                         $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 388                         $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 389                         $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 390                         $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 391                         $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 392                         $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 393                         $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 394
 395                         //$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 396
 397                         foreach ($items as $item) {
 398                                 $entry = self::entry($doc, $type, $item, $owner, true, 0);
 399                                 if (isset($entry)) {
 400                                         $root->appendChild($entry);
 401                                 }
 402                         }
 403                 } else {
 404                         self::entry($doc, $type, $item, $owner, true, 0, true);
 405                 }
 406
 407                 $atom = trim($doc->saveXML());
 408                 return $atom;
 409         }
 410
 411         /**
 412          * Create XML text for DFRN mails
 413          *
 414          * @param array $item  message elements
 415          * @param array $owner Owner record
 416          *
 417          * @return string DFRN mail
 418          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 419          * @todo  Find proper type-hints
 420          */
 421         public static function mail($item, $owner)
 422         {
 423                 $doc = new DOMDocument('1.0', 'utf-8');
 424                 $doc->formatOutput = true;
 425
 426                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 427
 428                 $mail = $doc->createElement("dfrn:mail");
 429                 $sender = $doc->createElement("dfrn:sender");
 430
 431                 XML::addElement($doc, $sender, "dfrn:name", $owner['name']);
 432                 XML::addElement($doc, $sender, "dfrn:uri", $owner['url']);
 433                 XML::addElement($doc, $sender, "dfrn:avatar", $owner['thumb']);
 434
 435                 $mail->appendChild($sender);
 436
 437                 XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 438                 XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
 439                 XML::addElement($doc, $mail, "dfrn:sentdate", DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
 440                 XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 441                 XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 442
 443                 $root->appendChild($mail);
 444
 445                 return trim($doc->saveXML());
 446         }
 447
 448         /**
 449          * Create XML text for DFRN friend suggestions
 450          *
 451          * @param array $item  suggestion elements
 452          * @param array $owner Owner record
 453          *
 454          * @return string DFRN suggestions
 455          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 456          * @todo  Find proper type-hints
 457          */
 458         public static function fsuggest($item, $owner)
 459         {
 460                 $doc = new DOMDocument('1.0', 'utf-8');
 461                 $doc->formatOutput = true;
 462
 463                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 464
 465                 $suggest = $doc->createElement("dfrn:suggest");
 466
 467                 XML::addElement($doc, $suggest, "dfrn:url", $item['url']);
 468                 XML::addElement($doc, $suggest, "dfrn:name", $item['name']);
 469                 XML::addElement($doc, $suggest, "dfrn:photo", $item['photo']);
 470                 XML::addElement($doc, $suggest, "dfrn:request", $item['request']);
 471                 XML::addElement($doc, $suggest, "dfrn:note", $item['note']);
 472
 473                 $root->appendChild($suggest);
 474
 475                 return trim($doc->saveXML());
 476         }
 477
 478         /**
 479          * Create XML text for DFRN relocations
 480          *
 481          * @param array $owner Owner record
 482          * @param int   $uid   User ID
 483          *
 484          * @return string DFRN relocations
 485          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 486          * @todo  Find proper type-hints
 487          */
 488         public static function relocate($owner, $uid)
 489         {
 490
 491                 /* get site pubkey. this could be a new installation with no site keys*/
 492                 $pubkey = DI::config()->get('system', 'site_pubkey');
 493                 if (! $pubkey) {
 494                         $res = Crypto::newKeypair(1024);
 495                         DI::config()->set('system', 'site_prvkey', $res['prvkey']);
 496                         DI::config()->set('system', 'site_pubkey', $res['pubkey']);
 497                 }
 498
 499                 $rp = q(
 500                         "SELECT `resource-id` , `scale`, type FROM `photo`
 501                                 WHERE `profile` = 1 AND `uid` = %d ORDER BY scale;",
 502                         $uid
 503                 );
 504                 $photos = [];
 505                 $ext = Images::supportedTypes();
 506
 507                 foreach ($rp as $p) {
 508                         $photos[$p['scale']] = DI::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
 509                 }
 510
 511
 512                 $doc = new DOMDocument('1.0', 'utf-8');
 513                 $doc->formatOutput = true;
 514
 515                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 516
 517                 $relocate = $doc->createElement("dfrn:relocate");
 518
 519                 XML::addElement($doc, $relocate, "dfrn:url", $owner['url']);
 520                 XML::addElement($doc, $relocate, "dfrn:name", $owner['name']);
 521                 XML::addElement($doc, $relocate, "dfrn:addr", $owner['addr']);
 522                 XML::addElement($doc, $relocate, "dfrn:avatar", $owner['avatar']);
 523                 XML::addElement($doc, $relocate, "dfrn:photo", $photos[4]);
 524                 XML::addElement($doc, $relocate, "dfrn:thumb", $photos[5]);
 525                 XML::addElement($doc, $relocate, "dfrn:micro", $photos[6]);
 526                 XML::addElement($doc, $relocate, "dfrn:request", $owner['request']);
 527                 XML::addElement($doc, $relocate, "dfrn:confirm", $owner['confirm']);
 528                 XML::addElement($doc, $relocate, "dfrn:notify", $owner['notify']);
 529                 XML::addElement($doc, $relocate, "dfrn:poll", $owner['poll']);
 530                 XML::addElement($doc, $relocate, "dfrn:sitepubkey", DI::config()->get('system', 'site_pubkey'));
 531
 532                 $root->appendChild($relocate);
 533
 534                 return trim($doc->saveXML());
 535         }
 536
 537         /**
 538          * Adds the header elements for the DFRN protocol
 539          *
 540          * @param DOMDocument $doc           XML document
 541          * @param array       $owner         Owner record
 542          * @param string      $authorelement Element name for the author
 543          * @param string      $alternatelink link to profile or category
 544          * @param bool        $public        Is it a header for public posts?
 545          *
 546          * @return object XML root object
 547          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 548          * @todo  Find proper type-hints
 549          */
 550         private static function addHeader(DOMDocument $doc, $owner, $authorelement, $alternatelink = "", $public = false)
 551         {
 552
 553                 if ($alternatelink == "") {
 554                         $alternatelink = $owner['url'];
 555                 }
 556
 557                 $root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 558                 $doc->appendChild($root);
 559
 560                 $root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 561                 $root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 562                 $root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 563                 $root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 564                 $root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 565                 $root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 566                 $root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 567                 $root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 568                 $root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 569
 570                 XML::addElement($doc, $root, "id", DI::baseUrl()."/profile/".$owner["nick"]);
 571                 XML::addElement($doc, $root, "title", $owner["name"]);
 572
 573                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION];
 574                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 575
 576                 $attributes = ["rel" => "license", "href" => "http://creativecommons.org/licenses/by/3.0/"];
 577                 XML::addElement($doc, $root, "link", "", $attributes);
 578
 579                 $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $alternatelink];
 580                 XML::addElement($doc, $root, "link", "", $attributes);
 581
 582
 583                 if ($public) {
 584                         // DFRN itself doesn't uses this. But maybe someone else wants to subscribe to the public feed.
 585                         OStatus::hublinks($doc, $root, $owner["nick"]);
 586
 587                         $attributes = ["rel" => "salmon", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 588                         XML::addElement($doc, $root, "link", "", $attributes);
 589
 590                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-replies", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 591                         XML::addElement($doc, $root, "link", "", $attributes);
 592
 593                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-mention", "href" => DI::baseUrl()."/salmon/".$owner["nick"]];
 594                         XML::addElement($doc, $root, "link", "", $attributes);
 595                 }
 596
 597                 // For backward compatibility we keep this element
 598                 if ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
 599                         XML::addElement($doc, $root, "dfrn:community", 1);
 600                 }
 601
 602                 // The former element is replaced by this one
 603                 XML::addElement($doc, $root, "dfrn:account_type", $owner["account-type"]);
 604
 605                 /// @todo We need a way to transmit the different page flags like "User::PAGE_FLAGS_PRVGROUP"
 606
 607                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 608
 609                 $author = self::addAuthor($doc, $owner, $authorelement, $public);
 610                 $root->appendChild($author);
 611
 612                 return $root;
 613         }
 614
 615         /**
 616          * Adds the author element in the header for the DFRN protocol
 617          *
 618          * @param DOMDocument $doc           XML document
 619          * @param array       $owner         Owner record
 620          * @param string      $authorelement Element name for the author
 621          * @param boolean     $public        boolean
 622          *
 623          * @return \DOMElement XML author object
 624          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 625          * @todo  Find proper type-hints
 626          */
 627         private static function addAuthor(DOMDocument $doc, array $owner, $authorelement, $public)
 628         {
 629                 // Should the profile be "unsearchable" in the net? Then add the "hide" element
 630                 $hide = DBA::exists('profile', ['uid' => $owner['uid'], 'net-publish' => false]);
 631
 632                 $author = $doc->createElement($authorelement);
 633
 634                 $namdate = DateTimeFormat::utc($owner['name-date'].'+00:00', DateTimeFormat::ATOM);
 635                 $picdate = DateTimeFormat::utc($owner['avatar-date'].'+00:00', DateTimeFormat::ATOM);
 636
 637                 $attributes = [];
 638
 639                 if (!$public || !$hide) {
 640                         $attributes = ["dfrn:updated" => $namdate];
 641                 }
 642
 643                 XML::addElement($doc, $author, "name", $owner["name"], $attributes);
 644                 XML::addElement($doc, $author, "uri", DI::baseUrl().'/profile/'.$owner["nickname"], $attributes);
 645                 XML::addElement($doc, $author, "dfrn:handle", $owner["addr"], $attributes);
 646
 647                 $attributes = ["rel" => "photo", "type" => "image/jpeg",
 648                                         "media:width" => 300, "media:height" => 300, "href" => $owner['photo']];
 649
 650                 if (!$public || !$hide) {
 651                         $attributes["dfrn:updated"] = $picdate;
 652                 }
 653
 654                 XML::addElement($doc, $author, "link", "", $attributes);
 655
 656                 $attributes["rel"] = "avatar";
 657                 XML::addElement($doc, $author, "link", "", $attributes);
 658
 659                 if ($hide) {
 660                         XML::addElement($doc, $author, "dfrn:hide", "true");
 661                 }
 662
 663                 // The following fields will only be generated if the data isn't meant for a public feed
 664                 if ($public) {
 665                         return $author;
 666                 }
 667
 668                 $birthday = feed_birthday($owner['uid'], $owner['timezone']);
 669
 670                 if ($birthday) {
 671                         XML::addElement($doc, $author, "dfrn:birthday", $birthday);
 672                 }
 673
 674                 // Only show contact details when we are allowed to
 675                 $profile = DBA::selectFirst('owner-view',
 676                         ['about', 'name', 'homepage', 'nickname', 'timezone', 'locality', 'region', 'country-name', 'pub_keywords', 'xmpp', 'dob'],
 677                         ['uid' => $owner['uid'], 'hidewall' => false]);
 678                 if (DBA::isResult($profile)) {
 679                         XML::addElement($doc, $author, "poco:displayName", $profile["name"]);
 680                         XML::addElement($doc, $author, "poco:updated", $namdate);
 681
 682                         if (trim($profile["dob"]) > DBA::NULL_DATE) {
 683                                 XML::addElement($doc, $author, "poco:birthday", "0000-".date("m-d", strtotime($profile["dob"])));
 684                         }
 685
 686                         XML::addElement($doc, $author, "poco:note", $profile["about"]);
 687                         XML::addElement($doc, $author, "poco:preferredUsername", $profile["nickname"]);
 688
 689                         $savetz = date_default_timezone_get();
 690                         date_default_timezone_set($profile["timezone"]);
 691                         XML::addElement($doc, $author, "poco:utcOffset", date("P"));
 692                         date_default_timezone_set($savetz);
 693
 694                         if (trim($profile["homepage"]) != "") {
 695                                 $urls = $doc->createElement("poco:urls");
 696                                 XML::addElement($doc, $urls, "poco:type", "homepage");
 697                                 XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
 698                                 XML::addElement($doc, $urls, "poco:primary", "true");
 699                                 $author->appendChild($urls);
 700                         }
 701
 702                         if (trim($profile["pub_keywords"]) != "") {
 703                                 $keywords = explode(",", $profile["pub_keywords"]);
 704
 705                                 foreach ($keywords as $keyword) {
 706                                         XML::addElement($doc, $author, "poco:tags", trim($keyword));
 707                                 }
 708                         }
 709
 710                         if (trim($profile["xmpp"]) != "") {
 711                                 $ims = $doc->createElement("poco:ims");
 712                                 XML::addElement($doc, $ims, "poco:type", "xmpp");
 713                                 XML::addElement($doc, $ims, "poco:value", $profile["xmpp"]);
 714                                 XML::addElement($doc, $ims, "poco:primary", "true");
 715                                 $author->appendChild($ims);
 716                         }
 717
 718                         if (trim($profile["locality"].$profile["region"].$profile["country-name"]) != "") {
 719                                 $element = $doc->createElement("poco:address");
 720
 721                                 XML::addElement($doc, $element, "poco:formatted", Profile::formatLocation($profile));
 722
 723                                 if (trim($profile["locality"]) != "") {
 724                                         XML::addElement($doc, $element, "poco:locality", $profile["locality"]);
 725                                 }
 726
 727                                 if (trim($profile["region"]) != "") {
 728                                         XML::addElement($doc, $element, "poco:region", $profile["region"]);
 729                                 }
 730
 731                                 if (trim($profile["country-name"]) != "") {
 732                                         XML::addElement($doc, $element, "poco:country", $profile["country-name"]);
 733                                 }
 734
 735                                 $author->appendChild($element);
 736                         }
 737                 }
 738
 739                 return $author;
 740         }
 741
 742         /**
 743          * Adds the author elements in the "entry" elements of the DFRN protocol
 744          *
 745          * @param DOMDocument $doc         XML document
 746          * @param string $element     Element name for the author
 747          * @param string $contact_url Link of the contact
 748          * @param array  $item        Item elements
 749          *
 750          * @return \DOMElement XML author object
 751          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 752          * @todo  Find proper type-hints
 753          */
 754         private static function addEntryAuthor(DOMDocument $doc, $element, $contact_url, $item)
 755         {
 756                 $author = $doc->createElement($element);
 757
 758                 $contact = Contact::getByURLForUser($contact_url, $item["uid"], false, ['url', 'name', 'addr', 'photo']);
 759                 if (!empty($contact)) {
 760                         XML::addElement($doc, $author, "name", $contact["name"]);
 761                         XML::addElement($doc, $author, "uri", $contact["url"]);
 762                         XML::addElement($doc, $author, "dfrn:handle", $contact["addr"]);
 763
 764                         /// @Todo
 765                         /// - Check real image type and image size
 766                         /// - Check which of these boths elements we should use
 767                         $attributes = [
 768                                 "rel" => "photo",
 769                                 "type" => "image/jpeg",
 770                                 "media:width" => 80,
 771                                 "media:height" => 80,
 772                                 "href" => $contact["photo"]];
 773                         XML::addElement($doc, $author, "link", "", $attributes);
 774
 775                         $attributes = [
 776                                 "rel" => "avatar",
 777                                 "type" => "image/jpeg",
 778                                 "media:width" => 80,
 779                                 "media:height" => 80,
 780                                 "href" => $contact["photo"]];
 781                         XML::addElement($doc, $author, "link", "", $attributes);
 782                 }
 783
 784                 return $author;
 785         }
 786
 787         /**
 788          * Adds the activity elements
 789          *
 790          * @param DOMDocument $doc      XML document
 791          * @param string      $element  Element name for the activity
 792          * @param string      $activity activity value
 793          *
 794          * @return \DOMElement XML activity object
 795          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 796          * @todo  Find proper type-hints
 797          */
 798         private static function createActivity(DOMDocument $doc, $element, $activity)
 799         {
 800                 if ($activity) {
 801                         $entry = $doc->createElement($element);
 802
 803                         $r = XML::parseString($activity);
 804                         if (!$r) {
 805                                 return false;
 806                         }
 807
 808                         if ($r->type) {
 809                                 XML::addElement($doc, $entry, "activity:object-type", $r->type);
 810                         }
 811
 812                         if ($r->id) {
 813                                 XML::addElement($doc, $entry, "id", $r->id);
 814                         }
 815
 816                         if ($r->title) {
 817                                 XML::addElement($doc, $entry, "title", $r->title);
 818                         }
 819
 820                         if ($r->link) {
 821                                 if (substr($r->link, 0, 1) == '<') {
 822                                         if (strstr($r->link, '&') && (! strstr($r->link, '&amp;'))) {
 823                                                 $r->link = str_replace('&', '&amp;', $r->link);
 824                                         }
 825
 826                                         $r->link = preg_replace('/\<link(.*?)\"\>/', '<link$1"/>', $r->link);
 827
 828                                         // XML does need a single element as root element so we add a dummy element here
 829                                         $data = XML::parseString("<dummy>" . $r->link . "</dummy>");
 830                                         if (is_object($data)) {
 831                                                 foreach ($data->link as $link) {
 832                                                         $attributes = [];
 833                                                         foreach ($link->attributes() as $parameter => $value) {
 834                                                                 $attributes[$parameter] = $value;
 835                                                         }
 836                                                         XML::addElement($doc, $entry, "link", "", $attributes);
 837                                                 }
 838                                         }
 839                                 } else {
 840                                         $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $r->link];
 841                                         XML::addElement($doc, $entry, "link", "", $attributes);
 842                                 }
 843                         }
 844                         if ($r->content) {
 845                                 XML::addElement($doc, $entry, "content", BBCode::convert($r->content), ["type" => "html"]);
 846                         }
 847
 848                         return $entry;
 849                 }
 850
 851                 return false;
 852         }
 853
 854         /**
 855          * Adds the elements for attachments
 856          *
 857          * @param object $doc  XML document
 858          * @param object $root XML root
 859          * @param array  $item Item element
 860          *
 861          * @return void XML attachment object
 862          * @todo  Find proper type-hints
 863          */
 864         private static function getAttachment($doc, $root, $item)
 865         {
 866                 $arr = explode('[/attach],', $item['attach']);
 867                 if (count($arr)) {
 868                         foreach ($arr as $r) {
 869                                 $matches = false;
 870                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 871                                 if ($cnt) {
 872                                         $attributes = ["rel" => "enclosure",
 873                                                         "href" => $matches[1],
 874                                                         "type" => $matches[3]];
 875
 876                                         if (intval($matches[2])) {
 877                                                 $attributes["length"] = intval($matches[2]);
 878                                         }
 879
 880                                         if (trim($matches[4]) != "") {
 881                                                 $attributes["title"] = trim($matches[4]);
 882                                         }
 883
 884                                         XML::addElement($doc, $root, "link", "", $attributes);
 885                                 }
 886                         }
 887                 }
 888         }
 889
 890         /**
 891          * Adds the "entry" elements for the DFRN protocol
 892          *
 893          * @param DOMDocument $doc     XML document
 894          * @param string      $type    "text" or "html"
 895          * @param array       $item    Item element
 896          * @param array       $owner   Owner record
 897          * @param bool        $comment Trigger the sending of the "comment" element
 898          * @param int         $cid     Contact ID of the recipient
 899          * @param bool        $single  If set, the entry is created as an XML document with a single "entry" element
 900          *
 901          * @return null|\DOMElement XML entry object
 902          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 903          * @throws \ImagickException
 904          * @todo  Find proper type-hints
 905          */
 906         private static function entry(DOMDocument $doc, $type, array $item, array $owner, $comment = false, $cid = 0, $single = false)
 907         {
 908                 $mentioned = [];
 909
 910                 if (!$item['parent']) {
 911                         Logger::notice('Item without parent found.', ['type' => $type, 'item' => $item]);
 912                         return null;
 913                 }
 914
 915                 if ($item['deleted']) {
 916                         $attributes = ["ref" => $item['uri'], "when" => DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM)];
 917                         return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 918                 }
 919
 920                 if (!$single) {
 921                         $entry = $doc->createElement("entry");
 922                 } else {
 923                         $entry = $doc->createElementNS(ActivityNamespace::ATOM1, 'entry');
 924                         $doc->appendChild($entry);
 925
 926                         $entry->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
 927                         $entry->setAttribute("xmlns:at", ActivityNamespace::TOMB);
 928                         $entry->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
 929                         $entry->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
 930                         $entry->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
 931                         $entry->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
 932                         $entry->setAttribute("xmlns:poco", ActivityNamespace::POCO);
 933                         $entry->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
 934                         $entry->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 935                 }
 936
 937                 if ($item['private'] == Item::PRIVATE) {
 938                         $body = Item::fixPrivatePhotos($item['body'], $owner['uid'], $item, $cid);
 939                 } else {
 940                         $body = $item['body'];
 941                 }
 942
 943                 // Remove the abstract element. It is only locally important.
 944                 $body = BBCode::stripAbstract($body);
 945
 946                 $htmlbody = '';
 947                 if ($type == 'html') {
 948                         $htmlbody = $body;
 949
 950                         if ($item['title'] != "") {
 951                                 $htmlbody = "[b]" . $item['title'] . "[/b]\n\n" . $htmlbody;
 952                         }
 953
 954                         $htmlbody = BBCode::convert($htmlbody, false, BBCode::OSTATUS);
 955                 }
 956
 957                 $author = self::addEntryAuthor($doc, "author", $item["author-link"], $item);
 958                 $entry->appendChild($author);
 959
 960                 $dfrnowner = self::addEntryAuthor($doc, "dfrn:owner", $item["owner-link"], $item);
 961                 $entry->appendChild($dfrnowner);
 962
 963                 if ($item['gravity'] != GRAVITY_PARENT) {
 964                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 965                         $parent = Item::selectFirst(['guid', 'plink'], ['uri' => $parent_item, 'uid' => $item['uid']]);
 966                         if (DBA::isResult($parent)) {
 967                                 $attributes = ["ref" => $parent_item, "type" => "text/html",
 968                                         "href" => $parent['plink'],
 969                                         "dfrn:diaspora_guid" => $parent['guid']];
 970                                 XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 971                         }
 972                 }
 973
 974                 // Add conversation data. This is used for OStatus
 975                 $conversation_href = DI::baseUrl()."/display/".$item["parent-guid"];
 976                 $conversation_uri = $conversation_href;
 977
 978                 if (isset($parent_item)) {
 979                         $conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $item['parent-uri']]);
 980                         if (DBA::isResult($conversation)) {
 981                                 if ($conversation['conversation-uri'] != '') {
 982                                         $conversation_uri = $conversation['conversation-uri'];
 983                                 }
 984                                 if ($conversation['conversation-href'] != '') {
 985                                         $conversation_href = $conversation['conversation-href'];
 986                                 }
 987                         }
 988                 }
 989
 990                 $attributes = [
 991                                 "href" => $conversation_href,
 992                                 "ref" => $conversation_uri];
 993
 994                 XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
 995
 996                 XML::addElement($doc, $entry, "id", $item["uri"]);
 997                 XML::addElement($doc, $entry, "title", $item["title"]);
 998
 999                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"] . "+00:00", DateTimeFormat::ATOM));
1000                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"] . "+00:00", DateTimeFormat::ATOM));
1001
1002                 // "dfrn:env" is used to read the content
1003                 XML::addElement($doc, $entry, "dfrn:env", Strings::base64UrlEncode($body, true));
1004
1005                 // The "content" field is not read by the receiver. We could remove it when the type is "text"
1006                 // We keep it at the moment, maybe there is some old version that doesn't read "dfrn:env"
1007                 XML::addElement($doc, $entry, "content", (($type == 'html') ? $htmlbody : $body), ["type" => $type]);
1008
1009                 // We save this value in "plink". Maybe we should read it from there as well?
1010                 XML::addElement(
1011                         $doc,
1012                         $entry,
1013                         "link",
1014                         "",
1015                         ["rel" => "alternate", "type" => "text/html",
1016                                  "href" => DI::baseUrl() . "/display/" . $item["guid"]]
1017                 );
1018
1019                 // "comment-allow" is some old fashioned stuff for old Friendica versions.
1020                 // It is included in the rewritten code for completeness
1021                 if ($comment) {
1022                         XML::addElement($doc, $entry, "dfrn:comment-allow", 1);
1023                 }
1024
1025                 if ($item['location']) {
1026                         XML::addElement($doc, $entry, "dfrn:location", $item['location']);
1027                 }
1028
1029                 if ($item['coord']) {
1030                         XML::addElement($doc, $entry, "georss:point", $item['coord']);
1031                 }
1032
1033                 if ($item['private']) {
1034                         // Friendica versions prior to 2020.3 can't handle "unlisted" properly. So we can only transmit public and private
1035                         XML::addElement($doc, $entry, "dfrn:private", ($item['private'] == Item::PRIVATE ? Item::PRIVATE : Item::PUBLIC));
1036                         XML::addElement($doc, $entry, "dfrn:unlisted", $item['private'] == Item::UNLISTED);
1037                 }
1038
1039                 if ($item['extid']) {
1040                         XML::addElement($doc, $entry, "dfrn:extid", $item['extid']);
1041                 }
1042
1043                 if ($item['post-type'] == Item::PT_PAGE) {
1044                         XML::addElement($doc, $entry, "dfrn:bookmark", "true");
1045                 }
1046
1047                 if ($item['app']) {
1048                         XML::addElement($doc, $entry, "statusnet:notice_info", "", ["local_id" => $item['id'], "source" => $item['app']]);
1049                 }
1050
1051                 XML::addElement($doc, $entry, "dfrn:diaspora_guid", $item["guid"]);
1052
1053                 // The signed text contains the content in Markdown, the sender handle and the signatur for the content
1054                 // It is needed for relayed comments to Diaspora.
1055                 if ($item['signed_text']) {
1056                         $sign = base64_encode(json_encode(['signed_text' => $item['signed_text'],'signature' => '','signer' => '']));
1057                         XML::addElement($doc, $entry, "dfrn:diaspora_signature", $sign);
1058                 }
1059
1060                 XML::addElement($doc, $entry, "activity:verb", self::constructVerb($item));
1061
1062                 if ($item['object-type'] != "") {
1063                         XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
1064                 } elseif ($item['gravity'] == GRAVITY_PARENT) {
1065                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::NOTE);
1066                 } else {
1067                         XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::COMMENT);
1068                 }
1069
1070                 $actobj = self::createActivity($doc, "activity:object", $item['object']);
1071                 if ($actobj) {
1072                         $entry->appendChild($actobj);
1073                 }
1074
1075                 $actarg = self::createActivity($doc, "activity:target", $item['target']);
1076                 if ($actarg) {
1077                         $entry->appendChild($actarg);
1078                 }
1079
1080                 $tags = Tag::getByURIId($item['uri-id']);
1081
1082                 if (count($tags)) {
1083                         foreach ($tags as $tag) {
1084                                 if (($type != 'html') || ($tag['type'] == Tag::HASHTAG)) {
1085                                         XML::addElement($doc, $entry, "category", "", ["scheme" => "X-DFRN:" . Tag::TAG_CHARACTER[$tag['type']] . ":" . $tag['url'], "term" => $tag['name']]);
1086                                 }
1087                                 if ($tag['type'] != Tag::HASHTAG) {
1088                                         $mentioned[$tag['url']] = $tag['url'];
1089                                 }
1090                         }
1091                 }
1092
1093                 foreach ($mentioned as $mention) {
1094                         $condition = ['uid' => $owner["uid"], 'nurl' => Strings::normaliseLink($mention)];
1095                         $contact = DBA::selectFirst('contact', ['forum', 'prv'], $condition);
1096
1097                         if (DBA::isResult($contact) && ($contact["forum"] || $contact["prv"])) {
1098                                 XML::addElement(
1099                                         $doc,
1100                                         $entry,
1101                                         "link",
1102                                         "",
1103                                         ["rel" => "mentioned",
1104                                                         "ostatus:object-type" => Activity\ObjectType::GROUP,
1105                                                         "href" => $mention]
1106                                 );
1107                         } else {
1108                                 XML::addElement(
1109                                         $doc,
1110                                         $entry,
1111                                         "link",
1112                                         "",
1113                                         ["rel" => "mentioned",
1114                                                         "ostatus:object-type" => Activity\ObjectType::PERSON,
1115                                                         "href" => $mention]
1116                                 );
1117                         }
1118                 }
1119
1120                 self::getAttachment($doc, $entry, $item);
1121
1122                 return $entry;
1123         }
1124
1125         /**
1126          * encrypts data via AES
1127          *
1128          * @param string $data The data that is to be encrypted
1129          * @param string $key  The AES key
1130          *
1131          * @return string encrypted data
1132          */
1133         private static function aesEncrypt($data, $key)
1134         {
1135                 return openssl_encrypt($data, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1136         }
1137
1138         /**
1139          * decrypts data via AES
1140          *
1141          * @param string $encrypted The encrypted data
1142          * @param string $key       The AES key
1143          *
1144          * @return string decrypted data
1145          */
1146         public static function aesDecrypt($encrypted, $key)
1147         {
1148                 return openssl_decrypt($encrypted, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1149         }
1150
1151         /**
1152          * Delivers the atom content to the contacts
1153          *
1154          * @param array  $owner    Owner record
1155          * @param array  $contact  Contact record of the receiver
1156          * @param string $atom     Content that will be transmitted
1157          * @param bool   $dissolve (to be documented)
1158          *
1159          * @return int Deliver status. Negative values mean an error.
1160          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1161          * @throws \ImagickException
1162          * @todo  Add array type-hint for $owner, $contact
1163          */
1164         public static function deliver($owner, $contact, $atom, $dissolve = false)
1165         {
1166                 $idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);
1167
1168                 if ($contact['duplex'] && $contact['dfrn-id']) {
1169                         $idtosend = '0:' . $orig_id;
1170                 }
1171                 if ($contact['duplex'] && $contact['issued-id']) {
1172                         $idtosend = '1:' . $orig_id;
1173                 }
1174
1175                 $rino = DI::config()->get('system', 'rino_encrypt');
1176                 $rino = intval($rino);
1177
1178                 Logger::log("Local rino version: ". $rino, Logger::DEBUG);
1179
1180                 $ssl_val = intval(DI::config()->get('system', 'ssl_policy'));
1181
1182                 switch ($ssl_val) {
1183                         case BaseURL::SSL_POLICY_FULL:
1184                                 $ssl_policy = 'full';
1185                                 break;
1186                         case BaseURL::SSL_POLICY_SELFSIGN:
1187                                 $ssl_policy = 'self';
1188                                 break;
1189                         case BaseURL::SSL_POLICY_NONE:
1190                         default:
1191                                 $ssl_policy = 'none';
1192                                 break;
1193                 }
1194
1195                 $url = $contact['notify'] . '&dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino='.$rino : '');
1196
1197                 Logger::log('dfrn_deliver: ' . $url);
1198
1199                 $curlResult = DI::httpRequest()->get($url);
1200
1201                 if ($curlResult->isTimeout()) {
1202                         return -2; // timed out
1203                 }
1204
1205                 $xml = $curlResult->getBody();
1206
1207                 $curl_stat = $curlResult->getReturnCode();
1208                 if (empty($curl_stat)) {
1209                         return -3; // timed out
1210                 }
1211
1212                 Logger::log('dfrn_deliver: ' . $xml, Logger::DATA);
1213
1214                 if (empty($xml)) {
1215                         return 3;
1216                 }
1217
1218                 if (strpos($xml, '<?xml') === false) {
1219                         Logger::log('dfrn_deliver: no valid XML returned');
1220                         Logger::log('dfrn_deliver: returned XML: ' . $xml, Logger::DATA);
1221                         return 3;
1222                 }
1223
1224                 $res = XML::parseString($xml);
1225
1226                 if (!is_object($res) || (intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
1227                         if (empty($res->status)) {
1228                                 $status = 3;
1229                         } else {
1230                                 $status = $res->status;
1231                         }
1232
1233                         return $status;
1234                 }
1235
1236                 $postvars     = [];
1237                 $sent_dfrn_id = hex2bin((string) $res->dfrn_id);
1238                 $challenge    = hex2bin((string) $res->challenge);
1239                 $perm         = (($res->perm) ? $res->perm : null);
1240                 $dfrn_version = floatval($res->dfrn_version ?: 2.0);
1241                 $rino_remote_version = intval($res->rino);
1242                 $page         = (($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? 1 : 0);
1243
1244                 Logger::log("Remote rino version: ".$rino_remote_version." for ".$contact["url"], Logger::DEBUG);
1245
1246                 if ($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
1247                         $page = 2;
1248                 }
1249
1250                 $final_dfrn_id = '';
1251
1252                 if ($perm) {
1253                         if ((($perm == 'rw') && !intval($contact['writable']))
1254                                 || (($perm == 'r') && intval($contact['writable']))
1255                         ) {
1256                                 DBA::update('contact', ['writable' => ($perm == 'rw')], ['id' => $contact['id']]);
1257
1258                                 $contact['writable'] = (string) 1 - intval($contact['writable']);
1259                         }
1260                 }
1261
1262                 if (($contact['duplex'] && strlen($contact['pubkey']))
1263                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1264                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1265                 ) {
1266                         openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
1267                         openssl_public_decrypt($challenge, $postvars['challenge'], $contact['pubkey']);
1268                 } else {
1269                         openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
1270                         openssl_private_decrypt($challenge, $postvars['challenge'], $contact['prvkey']);
1271                 }
1272
1273                 $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
1274
1275                 if (strpos($final_dfrn_id, ':') == 1) {
1276                         $final_dfrn_id = substr($final_dfrn_id, 2);
1277                 }
1278
1279                 if ($final_dfrn_id != $orig_id) {
1280                         Logger::log('dfrn_deliver: wrong dfrn_id.');
1281                         // did not decode properly - cannot trust this site
1282                         return 3;
1283                 }
1284
1285                 $postvars['dfrn_id']      = $idtosend;
1286                 $postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
1287                 if ($dissolve) {
1288                         $postvars['dissolve'] = '1';
1289                 }
1290
1291                 if ((($contact['rel']) && ($contact['rel'] != Contact::SHARING) && (! $contact['blocked'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1292                         $postvars['data'] = $atom;
1293                         $postvars['perm'] = 'rw';
1294                 } else {
1295                         $postvars['data'] = str_replace('<dfrn:comment-allow>1', '<dfrn:comment-allow>0', $atom);
1296                         $postvars['perm'] = 'r';
1297                 }
1298
1299                 $postvars['ssl_policy'] = $ssl_policy;
1300
1301                 if ($page) {
1302                         $postvars['page'] = $page;
1303                 }
1304
1305
1306                 if ($rino > 0 && $rino_remote_version > 0 && (! $dissolve)) {
1307                         Logger::log('rino version: '. $rino_remote_version);
1308
1309                         switch ($rino_remote_version) {
1310                                 case 1:
1311                                         $key = openssl_random_pseudo_bytes(16);
1312                                         $data = self::aesEncrypt($postvars['data'], $key);
1313                                         break;
1314
1315                                 default:
1316                                         Logger::log("rino: invalid requested version '$rino_remote_version'");
1317                                         return -8;
1318                         }
1319
1320                         $postvars['rino'] = $rino_remote_version;
1321                         $postvars['data'] = bin2hex($data);
1322
1323                         if ($dfrn_version >= 2.1) {
1324                                 if (($contact['duplex'] && strlen($contact['pubkey']))
1325                                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1326                                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1327                                 ) {
1328                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1329                                 } else {
1330                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1331                                 }
1332                         } else {
1333                                 if (($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1334                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1335                                 } else {
1336                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1337                                 }
1338                         }
1339
1340                         Logger::log('md5 rawkey ' . md5($postvars['key']));
1341
1342                         $postvars['key'] = bin2hex($postvars['key']);
1343                 }
1344
1345
1346                 Logger::debug('dfrn_deliver', ['post' => $postvars]);
1347
1348                 $postResult = DI::httpRequest()->post($contact['notify'], $postvars);
1349
1350                 $xml = $postResult->getBody();
1351
1352                 Logger::log('dfrn_deliver: ' . "RECEIVED: " . $xml, Logger::DATA);
1353
1354                 $curl_stat = $postResult->getReturnCode();
1355                 if (empty($curl_stat) || empty($xml)) {
1356                         return -9; // timed out
1357                 }
1358
1359                 if (($curl_stat == 503) && stristr($postResult->getHeader(), 'retry-after')) {
1360                         return -10;
1361                 }
1362
1363                 if (strpos($xml, '<?xml') === false) {
1364                         Logger::log('dfrn_deliver: phase 2: no valid XML returned');
1365                         Logger::log('dfrn_deliver: phase 2: returned XML: ' . $xml, Logger::DATA);
1366                         return 3;
1367                 }
1368
1369                 $res = XML::parseString($xml);
1370
1371                 if (!isset($res->status)) {
1372                         return -11;
1373                 }
1374
1375                 // Possibly old servers had returned an empty value when everything was okay
1376                 if (empty($res->status)) {
1377                         $res->status = 200;
1378                 }
1379
1380                 if (!empty($res->message)) {
1381                         Logger::log('Delivery returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1382                 }
1383
1384                 return intval($res->status);
1385         }
1386
1387         /**
1388          * Transmits atom content to the contacts via the Diaspora transport layer
1389          *
1390          * @param array  $owner   Owner record
1391          * @param array  $contact Contact record of the receiver
1392          * @param string $atom    Content that will be transmitted
1393          *
1394          * @param bool   $public_batch
1395          * @return int Deliver status. Negative values mean an error.
1396          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1397          * @throws \ImagickException
1398          */
1399         public static function transmit($owner, $contact, $atom, $public_batch = false)
1400         {
1401                 if (!$public_batch) {
1402                         if (empty($contact['addr'])) {
1403                                 Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
1404                                 if (Contact::updateFromProbe($contact['id'])) {
1405                                         $new_contact = DBA::selectFirst('contact', ['addr'], ['id' => $contact['id']]);
1406                                         $contact['addr'] = $new_contact['addr'];
1407                                 }
1408
1409                                 if (empty($contact['addr'])) {
1410                                         Logger::log('Unable to find contact handle for ' . $contact['id'] . ' - ' . $contact['url']);
1411                                         return -21;
1412                                 }
1413                         }
1414
1415                         $fcontact = FContact::getByURL($contact['addr']);
1416                         if (empty($fcontact)) {
1417                                 Logger::log('Unable to find contact details for ' . $contact['id'] . ' - ' . $contact['addr']);
1418                                 return -22;
1419                         }
1420                         $pubkey = $fcontact['pubkey'];
1421                 } else {
1422                         $pubkey = '';
1423                 }
1424
1425                 $envelope = Diaspora::buildMessage($atom, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
1426
1427                 // Create the endpoint for public posts. This is some WIP and should later be added to the probing
1428                 if ($public_batch && empty($contact["batch"])) {
1429                         $parts = parse_url($contact["notify"]);
1430                         $path_parts = explode('/', $parts['path']);
1431                         array_pop($path_parts);
1432                         $parts['path'] =  implode('/', $path_parts);
1433                         $contact["batch"] = Network::unparseURL($parts);
1434                 }
1435
1436                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
1437
1438                 if (empty($dest_url)) {
1439                         Logger::info('Empty destination', ['public' => $public_batch, 'contact' => $contact]);
1440                         return -24;
1441                 }
1442
1443                 $content_type = ($public_batch ? "application/magic-envelope+xml" : "application/json");
1444
1445                 $postResult = DI::httpRequest()->post($dest_url, $envelope, ["Content-Type: " . $content_type]);
1446                 $xml = $postResult->getBody();
1447
1448                 $curl_stat = $postResult->getReturnCode();
1449                 if (empty($curl_stat) || empty($xml)) {
1450                         Logger::log('Empty answer from ' . $contact['id'] . ' - ' . $dest_url);
1451                         return -9; // timed out
1452                 }
1453
1454                 if (($curl_stat == 503) && (stristr($postResult->getHeader(), 'retry-after'))) {
1455                         return -10;
1456                 }
1457
1458                 if (strpos($xml, '<?xml') === false) {
1459                         Logger::log('No valid XML returned from ' . $contact['id'] . ' - ' . $dest_url);
1460                         Logger::log('Returned XML: ' . $xml, Logger::DATA);
1461                         return 3;
1462                 }
1463
1464                 $res = XML::parseString($xml);
1465
1466                 if (empty($res->status)) {
1467                         return -23;
1468                 }
1469
1470                 if (!empty($res->message)) {
1471                         Logger::log('Transmit to ' . $dest_url . ' returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1472                 }
1473
1474                 return intval($res->status);
1475         }
1476
1477         /**
1478          * Fetch the author data from head or entry items
1479          *
1480          * @param object $xpath     XPath object
1481          * @param object $context   In which context should the data be searched
1482          * @param array  $importer  Record of the importer user mixed with contact of the content
1483          * @param string $element   Element name from which the data is fetched
1484          * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
1485          * @param string $xml       optional, default empty
1486          *
1487          * @return array Relevant data of the author
1488          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1489          * @throws \ImagickException
1490          * @todo  Find good type-hints for all parameter
1491          */
1492         private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
1493         {
1494                 $author = [];
1495                 $author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
1496                 $author["link"] = XML::getFirstNodeValue($xpath, $element."/atom:uri/text()", $context);
1497
1498                 $fields = ['id', 'uid', 'url', 'network', 'avatar-date', 'avatar', 'name-date', 'uri-date', 'addr',
1499                         'name', 'nick', 'about', 'location', 'keywords', 'xmpp', 'bdyear', 'bd', 'hidden', 'contact-type'];
1500                 $condition = ["`uid` = ? AND `nurl` = ? AND `network` != ?",
1501                         $importer["importer_uid"], Strings::normaliseLink($author["link"]), Protocol::STATUSNET];
1502                 $contact_old = DBA::selectFirst('contact', $fields, $condition);
1503
1504                 if (DBA::isResult($contact_old)) {
1505                         $author["contact-id"] = $contact_old["id"];
1506                         $author["network"] = $contact_old["network"];
1507                 } else {
1508                         if (!$onlyfetch) {
1509                                 Logger::debug("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml);
1510                         }
1511
1512                         $author["contact-unknown"] = true;
1513                         $author["contact-id"] = $importer["id"];
1514                         $author["network"] = $importer["network"];
1515                         $onlyfetch = true;
1516                 }
1517
1518                 // Until now we aren't serving different sizes - but maybe later
1519                 $avatarlist = [];
1520                 /// @todo check if "avatar" or "photo" would be the best field in the specification
1521                 $avatars = $xpath->query($element . "/atom:link[@rel='avatar']", $context);
1522                 foreach ($avatars as $avatar) {
1523                         $href = "";
1524                         $width = 0;
1525                         foreach ($avatar->attributes as $attributes) {
1526                                 /// @TODO Rewrite these similar if() to one switch
1527                                 if ($attributes->name == "href") {
1528                                         $href = $attributes->textContent;
1529                                 }
1530                                 if ($attributes->name == "width") {
1531                                         $width = $attributes->textContent;
1532                                 }
1533                                 if ($attributes->name == "updated") {
1534                                         $author["avatar-date"] = $attributes->textContent;
1535                                 }
1536                         }
1537                         if (($width > 0) && ($href != "")) {
1538                                 $avatarlist[$width] = $href;
1539                         }
1540                 }
1541
1542                 if (count($avatarlist) > 0) {
1543                         krsort($avatarlist);
1544                         $author["avatar"] = current($avatarlist);
1545                 }
1546
1547                 if (empty($author['avatar']) && !empty($author['link'])) {
1548                         $cid = Contact::getIdForURL($author['link'], 0);
1549                         if (!empty($cid)) {
1550                                 $contact = DBA::selectFirst('contact', ['avatar'], ['id' => $cid]);
1551                                 if (DBA::isResult($contact)) {
1552                                         $author['avatar'] = $contact['avatar'];
1553                                 }
1554                         }
1555                 }
1556
1557                 if (empty($author['avatar'])) {
1558                         Logger::log('Empty author: ' . $xml);
1559                         $author['avatar'] = '';
1560                 }
1561
1562                 if (DBA::isResult($contact_old) && !$onlyfetch) {
1563                         Logger::log("Check if contact details for contact " . $contact_old["id"] . " (" . $contact_old["nick"] . ") have to be updated.", Logger::DEBUG);
1564
1565                         $poco = ["url" => $contact_old["url"], "network" => $contact_old["network"]];
1566
1567                         // When was the last change to name or uri?
1568                         $name_element = $xpath->query($element . "/atom:name", $context)->item(0);
1569                         foreach ($name_element->attributes as $attributes) {
1570                                 if ($attributes->name == "updated") {
1571                                         $poco["name-date"] = $attributes->textContent;
1572                                 }
1573                         }
1574
1575                         $link_element = $xpath->query($element . "/atom:link", $context)->item(0);
1576                         foreach ($link_element->attributes as $attributes) {
1577                                 if ($attributes->name == "updated") {
1578                                         $poco["uri-date"] = $attributes->textContent;
1579                                 }
1580                         }
1581
1582                         // Update contact data
1583                         $value = XML::getFirstNodeValue($xpath, $element . "/dfrn:handle/text()", $context);
1584                         if ($value != "") {
1585                                 $poco["addr"] = $value;
1586                         }
1587
1588                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:displayName/text()", $context);
1589                         if ($value != "") {
1590                                 $poco["name"] = $value;
1591                         }
1592
1593                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:preferredUsername/text()", $context);
1594                         if ($value != "") {
1595                                 $poco["nick"] = $value;
1596                         }
1597
1598                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:note/text()", $context);
1599                         if ($value != "") {
1600                                 $poco["about"] = $value;
1601                         }
1602
1603                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:address/poco:formatted/text()", $context);
1604                         if ($value != "") {
1605                                 $poco["location"] = $value;
1606                         }
1607
1608                         /// @todo Only search for elements with "poco:type" = "xmpp"
1609                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:ims/poco:value/text()", $context);
1610                         if ($value != "") {
1611                                 $poco["xmpp"] = $value;
1612                         }
1613
1614                         /// @todo Add support for the following fields that we don't support by now in the contact table:
1615                         /// - poco:utcOffset
1616                         /// - poco:urls
1617                         /// - poco:locality
1618                         /// - poco:region
1619                         /// - poco:country
1620
1621                         // If the "hide" element is present then the profile isn't searchable.
1622                         $hide = intval(XML::getFirstNodeValue($xpath, $element . "/dfrn:hide/text()", $context) == "true");
1623
1624                         Logger::log("Hidden status for contact " . $contact_old["url"] . ": " . $hide, Logger::DEBUG);
1625
1626                         // If the contact isn't searchable then set the contact to "hidden".
1627                         // Problem: This can be manually overridden by the user.
1628                         if ($hide) {
1629                                 $contact_old["hidden"] = true;
1630                         }
1631
1632                         // Save the keywords into the contact table
1633                         $tags = [];
1634                         $tagelements = $xpath->evaluate($element . "/poco:tags/text()", $context);
1635                         foreach ($tagelements as $tag) {
1636                                 $tags[$tag->nodeValue] = $tag->nodeValue;
1637                         }
1638
1639                         if (count($tags)) {
1640                                 $poco["keywords"] = implode(", ", $tags);
1641                         }
1642
1643                         // "dfrn:birthday" contains the birthday converted to UTC
1644                         $birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1645
1646                         if (strtotime($birthday) > time()) {
1647                                 $bd_timestamp = strtotime($birthday);
1648
1649                                 $poco["bdyear"] = date("Y", $bd_timestamp);
1650                         }
1651
1652                         // "poco:birthday" is the birthday in the format "yyyy-mm-dd"
1653                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1654
1655                         if (!in_array($value, ["", "0000-00-00", DBA::NULL_DATE])) {
1656                                 $bdyear = date("Y");
1657                                 $value = str_replace(["0000", "0001"], $bdyear, $value);
1658
1659                                 if (strtotime($value) < time()) {
1660                                         $value = str_replace($bdyear, $bdyear + 1, $value);
1661                                 }
1662
1663                                 $poco["bd"] = $value;
1664                         }
1665
1666                         $contact = array_merge($contact_old, $poco);
1667
1668                         if ($contact_old["bdyear"] != $contact["bdyear"]) {
1669                                 Event::createBirthday($contact, $birthday);
1670                         }
1671
1672                         $fields = ['name' => $contact['name'], 'nick' => $contact['nick'], 'about' => $contact['about'],
1673                                 'location' => $contact['location'], 'addr' => $contact['addr'], 'keywords' => $contact['keywords'],
1674                                 'bdyear' => $contact['bdyear'], 'bd' => $contact['bd'], 'hidden' => $contact['hidden'],
1675                                 'xmpp' => $contact['xmpp'], 'name-date' => DateTimeFormat::utc($contact['name-date']),
1676                                 'unsearchable' => $contact['hidden'], 'uri-date' => DateTimeFormat::utc($contact['uri-date'])];
1677
1678                         DBA::update('contact', $fields, ['id' => $contact['id'], 'network' => $contact['network']], $contact_old);
1679
1680                         // Update the public contact. Don't set the "hidden" value, this is used differently for public contacts
1681                         unset($fields['hidden']);
1682                         $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($contact_old['url'])];
1683                         DBA::update('contact', $fields, $condition, true);
1684
1685                         Contact::updateAvatar($contact['id'], $author['avatar']);
1686
1687                         $pcid = Contact::getIdForURL($contact_old['url']);
1688                         if (!empty($pcid)) {
1689                                 Contact::updateAvatar($pcid, $author['avatar']);
1690                         }
1691                 }
1692
1693                 return $author;
1694         }
1695
1696         /**
1697          * Transforms activity objects into an XML string
1698          *
1699          * @param object $xpath    XPath object
1700          * @param object $activity Activity object
1701          * @param string $element  element name
1702          *
1703          * @return string XML string
1704          * @todo Find good type-hints for all parameter
1705          */
1706         private static function transformActivity($xpath, $activity, $element)
1707         {
1708                 if (!is_object($activity)) {
1709                         return "";
1710                 }
1711
1712                 $obj_doc = new DOMDocument("1.0", "utf-8");
1713                 $obj_doc->formatOutput = true;
1714
1715                 $obj_element = $obj_doc->createElementNS( ActivityNamespace::ATOM1, $element);
1716
1717                 $activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
1718                 XML::addElement($obj_doc, $obj_element, "type", $activity_type);
1719
1720                 $id = $xpath->query("atom:id", $activity)->item(0);
1721                 if (is_object($id)) {
1722                         $obj_element->appendChild($obj_doc->importNode($id, true));
1723                 }
1724
1725                 $title = $xpath->query("atom:title", $activity)->item(0);
1726                 if (is_object($title)) {
1727                         $obj_element->appendChild($obj_doc->importNode($title, true));
1728                 }
1729
1730                 $links = $xpath->query("atom:link", $activity);
1731                 if (is_object($links)) {
1732                         foreach ($links as $link) {
1733                                 $obj_element->appendChild($obj_doc->importNode($link, true));
1734                         }
1735                 }
1736
1737                 $content = $xpath->query("atom:content", $activity)->item(0);
1738                 if (is_object($content)) {
1739                         $obj_element->appendChild($obj_doc->importNode($content, true));
1740                 }
1741
1742                 $obj_doc->appendChild($obj_element);
1743
1744                 $objxml = $obj_doc->saveXML($obj_element);
1745
1746                 /// @todo This isn't totally clean. We should find a way to transform the namespaces
1747                 $objxml = str_replace("<".$element.' xmlns="http://www.w3.org/2005/Atom">', "<".$element.">", $objxml);
1748                 return($objxml);
1749         }
1750
1751         /**
1752          * Processes the mail elements
1753          *
1754          * @param object $xpath    XPath object
1755          * @param object $mail     mail elements
1756          * @param array  $importer Record of the importer user mixed with contact of the content
1757          * @return void
1758          * @throws \Exception
1759          * @todo  Find good type-hints for all parameter
1760          */
1761         private static function processMail($xpath, $mail, $importer)
1762         {
1763                 Logger::log("Processing mails");
1764
1765                 $msg = [];
1766                 $msg["uid"] = $importer["importer_uid"];
1767                 $msg["from-name"] = $xpath->query("dfrn:sender/dfrn:name/text()", $mail)->item(0)->nodeValue;
1768                 $msg["from-url"] = $xpath->query("dfrn:sender/dfrn:uri/text()", $mail)->item(0)->nodeValue;
1769                 $msg["from-photo"] = $xpath->query("dfrn:sender/dfrn:avatar/text()", $mail)->item(0)->nodeValue;
1770                 $msg["contact-id"] = $importer["id"];
1771                 $msg["uri"] = $xpath->query("dfrn:id/text()", $mail)->item(0)->nodeValue;
1772                 $msg["parent-uri"] = $xpath->query("dfrn:in-reply-to/text()", $mail)->item(0)->nodeValue;
1773                 $msg["created"] = DateTimeFormat::utc($xpath->query("dfrn:sentdate/text()", $mail)->item(0)->nodeValue);
1774                 $msg["title"] = $xpath->query("dfrn:subject/text()", $mail)->item(0)->nodeValue;
1775                 $msg["body"] = $xpath->query("dfrn:content/text()", $mail)->item(0)->nodeValue;
1776
1777                 Mail::insert($msg);
1778         }
1779
1780         /**
1781          * Processes the suggestion elements
1782          *
1783          * @param object $xpath      XPath object
1784          * @param object $suggestion suggestion elements
1785          * @param array  $importer   Record of the importer user mixed with contact of the content
1786          * @return boolean
1787          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1788          * @todo  Find good type-hints for all parameter
1789          */
1790         private static function processSuggestion($xpath, $suggestion, $importer)
1791         {
1792                 Logger::log('Processing suggestions');
1793
1794                 /// @TODO Rewrite this to one statement
1795                 $suggest = [];
1796                 $suggest['uid'] = $importer['importer_uid'];
1797                 $suggest['cid'] = $importer['id'];
1798                 $suggest['url'] = $xpath->query('dfrn:url/text()', $suggestion)->item(0)->nodeValue;
1799                 $suggest['name'] = $xpath->query('dfrn:name/text()', $suggestion)->item(0)->nodeValue;
1800                 $suggest['photo'] = $xpath->query('dfrn:photo/text()', $suggestion)->item(0)->nodeValue;
1801                 $suggest['request'] = $xpath->query('dfrn:request/text()', $suggestion)->item(0)->nodeValue;
1802                 $suggest['body'] = $xpath->query('dfrn:note/text()', $suggestion)->item(0)->nodeValue;
1803
1804                 // Does our member already have a friend matching this description?
1805
1806                 /*
1807                  * The valid result means the friend we're about to send a friend
1808                  * suggestion already has them in their contact, which means no further
1809                  * action is required.
1810                  *
1811                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1812                  */
1813                 $condition = ['nurl' => Strings::normaliseLink($suggest['url']), 'uid' => $suggest['uid']];
1814                 if (DBA::exists('contact', $condition)) {
1815                         return false;
1816                 }
1817                 // Do we already have an fcontact record for this person?
1818
1819                 $fid = 0;
1820                 $fcontact = DBA::selectFirst('fcontact', ['id'], ['url' => $suggest['url']]);
1821                 if (DBA::isResult($fcontact)) {
1822                         $fid = $fcontact['id'];
1823
1824                         // OK, we do. Do we already have an introduction for this person?
1825                         if (DBA::exists('intro', ['uid' => $suggest['uid'], 'fid' => $fid])) {
1826                                 /*
1827                                  * The valid result means the friend we're about to send a friend
1828                                  * suggestion already has them in their contact, which means no further
1829                                  * action is required.
1830                                  *
1831                                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1832                                  */
1833                                 return false;
1834                         }
1835                 }
1836
1837                 if (!$fid) {
1838                         $fields = ['name' => $suggest['name'], 'url' => $suggest['url'],
1839                                 'photo' => $suggest['photo'], 'request' => $suggest['request']];
1840                         DBA::insert('fcontact', $fields);
1841                         $fid = DBA::lastInsertId();
1842                 }
1843
1844                 /*
1845                  * If no record in fcontact is found, below INSERT statement will not
1846                  * link an introduction to it.
1847                  */
1848                 if (empty($fid)) {
1849                         // Database record did not get created. Quietly give up.
1850                         exit();
1851                 }
1852
1853                 $hash = Strings::getRandomHex();
1854
1855                 $fields = ['uid' => $suggest['uid'], 'fid' => $fid, 'contact-id' => $suggest['cid'],
1856                         'note' => $suggest['body'], 'hash' => $hash, 'datetime' => DateTimeFormat::utcNow(), 'blocked' => false];
1857                 DBA::insert('intro', $fields);
1858
1859                 notification(
1860                         [
1861                                 'type'         => Type::SUGGEST,
1862                                 'notify_flags' => $importer['notify-flags'],
1863                                 'language'     => $importer['language'],
1864                                 'to_name'      => $importer['username'],
1865                                 'to_email'     => $importer['email'],
1866                                 'uid'          => $importer['importer_uid'],
1867                                 'item'         => $suggest,
1868                                 'link'         => DI::baseUrl().'/notifications/intros',
1869                                 'source_name'  => $importer['name'],
1870                                 'source_link'  => $importer['url'],
1871                                 'source_photo' => $importer['photo'],
1872                                 'verb'         => Activity::REQ_FRIEND,
1873                                 'otype'        => 'intro']
1874                 );
1875
1876                 return true;
1877         }
1878
1879         /**
1880          * Processes the relocation elements
1881          *
1882          * @param object $xpath      XPath object
1883          * @param object $relocation relocation elements
1884          * @param array  $importer   Record of the importer user mixed with contact of the content
1885          * @return boolean
1886          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1887          * @throws \ImagickException
1888          * @todo  Find good type-hints for all parameter
1889          */
1890         private static function processRelocation($xpath, $relocation, $importer)
1891         {
1892                 Logger::log("Processing relocations");
1893
1894                 /// @TODO Rewrite this to one statement
1895                 $relocate = [];
1896                 $relocate["uid"] = $importer["importer_uid"];
1897                 $relocate["cid"] = $importer["id"];
1898                 $relocate["url"] = $xpath->query("dfrn:url/text()", $relocation)->item(0)->nodeValue;
1899                 $relocate["addr"] = $xpath->query("dfrn:addr/text()", $relocation)->item(0)->nodeValue;
1900                 $relocate["name"] = $xpath->query("dfrn:name/text()", $relocation)->item(0)->nodeValue;
1901                 $relocate["avatar"] = $xpath->query("dfrn:avatar/text()", $relocation)->item(0)->nodeValue;
1902                 $relocate["photo"] = $xpath->query("dfrn:photo/text()", $relocation)->item(0)->nodeValue;
1903                 $relocate["thumb"] = $xpath->query("dfrn:thumb/text()", $relocation)->item(0)->nodeValue;
1904                 $relocate["micro"] = $xpath->query("dfrn:micro/text()", $relocation)->item(0)->nodeValue;
1905                 $relocate["request"] = $xpath->query("dfrn:request/text()", $relocation)->item(0)->nodeValue;
1906                 $relocate["confirm"] = $xpath->query("dfrn:confirm/text()", $relocation)->item(0)->nodeValue;
1907                 $relocate["notify"] = $xpath->query("dfrn:notify/text()", $relocation)->item(0)->nodeValue;
1908                 $relocate["poll"] = $xpath->query("dfrn:poll/text()", $relocation)->item(0)->nodeValue;
1909                 $relocate["sitepubkey"] = $xpath->query("dfrn:sitepubkey/text()", $relocation)->item(0)->nodeValue;
1910
1911                 if (($relocate["avatar"] == "") && ($relocate["photo"] != "")) {
1912                         $relocate["avatar"] = $relocate["photo"];
1913                 }
1914
1915                 if ($relocate["addr"] == "") {
1916                         $relocate["addr"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$3@$2", $relocate["url"]);
1917                 }
1918
1919                 // update contact
1920                 $r = q(
1921                         "SELECT `photo`, `url` FROM `contact` WHERE `id` = %d AND `uid` = %d",
1922                         intval($importer["id"]),
1923                         intval($importer["importer_uid"])
1924                 );
1925
1926                 if (!DBA::isResult($r)) {
1927                         Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
1928                         return false;
1929                 }
1930
1931                 $old = $r[0];
1932
1933                 // Update the contact table. We try to find every entry.
1934                 $fields = ['name' => $relocate["name"], 'avatar' => $relocate["avatar"],
1935                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1936                         'addr' => $relocate["addr"], 'request' => $relocate["request"],
1937                         'confirm' => $relocate["confirm"], 'notify' => $relocate["notify"],
1938                         'poll' => $relocate["poll"], 'site-pubkey' => $relocate["sitepubkey"]];
1939                 $condition = ["(`id` = ?) OR (`nurl` = ?)", $importer["id"], Strings::normaliseLink($old["url"])];
1940
1941                 DBA::update('contact', $fields, $condition);
1942
1943                 Contact::updateAvatar($importer["id"], $relocate["avatar"], true);
1944
1945                 Logger::log('Contacts are updated.');
1946
1947                 /// @TODO
1948                 /// merge with current record, current contents have priority
1949                 /// update record, set url-updated
1950                 /// update profile photos
1951                 /// schedule a scan?
1952                 return true;
1953         }
1954
1955         /**
1956          * Updates an item
1957          *
1958          * @param array $current   the current item record
1959          * @param array $item      the new item record
1960          * @param array $importer  Record of the importer user mixed with contact of the content
1961          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
1962          * @return mixed
1963          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1964          * @todo  set proper type-hints (array?)
1965          */
1966         private static function updateContent($current, $item, $importer, $entrytype)
1967         {
1968                 $changed = false;
1969
1970                 if (self::isEditedTimestampNewer($current, $item)) {
1971                         // do not accept (ignore) an earlier edit than one we currently have.
1972                         if (DateTimeFormat::utc($item["edited"]) < $current["edited"]) {
1973                                 return false;
1974                         }
1975
1976                         $fields = ['title' => $item['title'] ?? '', 'body' => $item['body'] ?? '',
1977                                         'changed' => DateTimeFormat::utcNow(),
1978                                         'edited' => DateTimeFormat::utc($item["edited"])];
1979
1980                         $condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
1981                         Item::update($fields, $condition);
1982
1983                         $changed = true;
1984                 }
1985                 return $changed;
1986         }
1987
1988         /**
1989          * Detects the entry type of the item
1990          *
1991          * @param array $importer Record of the importer user mixed with contact of the content
1992          * @param array $item     the new item record
1993          *
1994          * @return int Is it a toplevel entry, a comment or a relayed comment?
1995          * @throws \Exception
1996          * @todo  set proper type-hints (array?)
1997          */
1998         private static function getEntryType($importer, $item)
1999         {
2000                 if ($item["parent-uri"] != $item["uri"]) {
2001                         $community = false;
2002
2003                         if ($importer["page-flags"] == User::PAGE_FLAGS_COMMUNITY || $importer["page-flags"] == User::PAGE_FLAGS_PRVGROUP) {
2004                                 $sql_extra = "";
2005                                 $community = true;
2006                                 Logger::log("possible community action");
2007                         } else {
2008                                 $sql_extra = " AND `contact`.`self` AND `item`.`wall` ";
2009                         }
2010
2011                         // was the top-level post for this action written by somebody on this site?
2012                         // Specifically, the recipient?
2013
2014                         $is_a_remote_action = false;
2015
2016                         $parent = Item::selectFirst(['parent-uri'], ['uri' => $item["parent-uri"]]);
2017                         if (DBA::isResult($parent)) {
2018                                 $r = q(
2019                                         "SELECT `item`.`forum_mode`, `item`.`wall` FROM `item`
2020                                         INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2021                                         WHERE `item`.`uri` = '%s' AND (`item`.`parent-uri` = '%s' OR `item`.`thr-parent` = '%s')
2022                                         AND `item`.`uid` = %d
2023                                         $sql_extra
2024                                         LIMIT 1",
2025                                         DBA::escape($parent["parent-uri"]),
2026                                         DBA::escape($parent["parent-uri"]),
2027                                         DBA::escape($parent["parent-uri"]),
2028                                         intval($importer["importer_uid"])
2029                                 );
2030                                 if (DBA::isResult($r)) {
2031                                         $is_a_remote_action = true;
2032                                 }
2033                         }
2034
2035                         /*
2036                          * Does this have the characteristics of a community or private group action?
2037                          * If it's an action to a wall post on a community/prvgroup page it's a
2038                          * valid community action. Also forum_mode makes it valid for sure.
2039                          * If neither, it's not.
2040                          */
2041                         if ($is_a_remote_action && $community && (!$r[0]["forum_mode"]) && (!$r[0]["wall"])) {
2042                                 $is_a_remote_action = false;
2043                                 Logger::log("not a community action");
2044                         }
2045
2046                         if ($is_a_remote_action) {
2047                                 return DFRN::REPLY_RC;
2048                         } else {
2049                                 return DFRN::REPLY;
2050                         }
2051                 } else {
2052                         return DFRN::TOP_LEVEL;
2053                 }
2054         }
2055
2056         /**
2057          * Send a "poke"
2058          *
2059          * @param array $item      The new item record
2060          * @param array $importer  Record of the importer user mixed with contact of the content
2061          * @return void
2062          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2063          * @todo  set proper type-hints (array?)
2064          */
2065         private static function doPoke(array $item, array $importer)
2066         {
2067                 $verb = urldecode(substr($item["verb"], strpos($item["verb"], "#")+1));
2068                 if (!$verb) {
2069                         return;
2070                 }
2071                 $xo = XML::parseString($item["object"]);
2072
2073                 if (($xo->type == Activity\ObjectType::PERSON) && ($xo->id)) {
2074                         // somebody was poked/prodded. Was it me?
2075                         $Blink = '';
2076                         foreach ($xo->link as $l) {
2077                                 $atts = $l->attributes();
2078                                 switch ($atts["rel"]) {
2079                                         case "alternate":
2080                                                 $Blink = $atts["href"];
2081                                                 break;
2082                                         default:
2083                                                 break;
2084                                 }
2085                         }
2086
2087                         if ($Blink && Strings::compareLink($Blink, DI::baseUrl() . "/profile/" . $importer["nickname"])) {
2088                                 $author = DBA::selectFirst('contact', ['name', 'thumb', 'url'], ['id' => $item['author-id']]);
2089
2090                                 $parent = Item::selectFirst(['id'], ['uri' => $item['parent-uri'], 'uid' => $importer["importer_uid"]]);
2091                                 $item['parent'] = $parent['id'];
2092
2093                                 // send a notification
2094                                 notification(
2095                                         [
2096                                         "type"         => Type::POKE,
2097                                         "notify_flags" => $importer["notify-flags"],
2098                                         "language"     => $importer["language"],
2099                                         "to_name"      => $importer["username"],
2100                                         "to_email"     => $importer["email"],
2101                                         "uid"          => $importer["importer_uid"],
2102                                         "item"         => $item,
2103                                         "link"         => DI::baseUrl()."/display/".urlencode($item['guid']),
2104                                         "source_name"  => $author["name"],
2105                                         "source_link"  => $author["url"],
2106                                         "source_photo" => $author["thumb"],
2107                                         "verb"         => $item["verb"],
2108                                         "otype"        => "person",
2109                                         "activity"     => $verb,
2110                                         "parent"       => $item['parent']]
2111                                 );
2112                         }
2113                 }
2114         }
2115
2116         /**
2117          * Processes several actions, depending on the verb
2118          *
2119          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2120          * @param array $importer  Record of the importer user mixed with contact of the content
2121          * @param array $item      the new item record
2122          * @param bool  $is_like   Is the verb a "like"?
2123          *
2124          * @return bool Should the processing of the entries be continued?
2125          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2126          * @todo  set proper type-hints (array?)
2127          */
2128         private static function processVerbs($entrytype, $importer, &$item, &$is_like)
2129         {
2130                 Logger::log("Process verb ".$item["verb"]." and object-type ".$item["object-type"]." for entrytype ".$entrytype, Logger::DEBUG);
2131
2132                 if (($entrytype == DFRN::TOP_LEVEL) && !empty($importer['id'])) {
2133                         // The filling of the the "contact" variable is done for legcy reasons
2134                         // The functions below are partly used by ostatus.php as well - where we have this variable
2135                         $contact = Contact::selectFirst([], ['id' => $importer['id']]);
2136
2137                         $activity = DI::activity();
2138
2139                         // Big question: Do we need these functions? They were part of the "consume_feed" function.
2140                         // This function once was responsible for DFRN and OStatus.
2141                         if ($activity->match($item["verb"], Activity::FOLLOW)) {
2142                                 Logger::log("New follower");
2143                                 Contact::addRelationship($importer, $contact, $item);
2144                                 return false;
2145                         }
2146                         if ($activity->match($item["verb"], Activity::UNFOLLOW)) {
2147                                 Logger::log("Lost follower");
2148                                 Contact::removeFollower($importer, $contact, $item);
2149                                 return false;
2150                         }
2151                         if ($activity->match($item["verb"], Activity::REQ_FRIEND)) {
2152                                 Logger::log("New friend request");
2153                                 Contact::addRelationship($importer, $contact, $item, true);
2154                                 return false;
2155                         }
2156                         if ($activity->match($item["verb"], Activity::UNFRIEND)) {
2157                                 Logger::log("Lost sharer");
2158                                 Contact::removeSharer($importer, $contact, $item);
2159                                 return false;
2160                         }
2161                 } else {
2162                         if (($item["verb"] == Activity::LIKE)
2163                                 || ($item["verb"] == Activity::DISLIKE)
2164                                 || ($item["verb"] == Activity::ATTEND)
2165                                 || ($item["verb"] == Activity::ATTENDNO)
2166                                 || ($item["verb"] == Activity::ATTENDMAYBE)
2167                                 || ($item["verb"] == Activity::ANNOUNCE)
2168                         ) {
2169                                 $is_like = true;
2170                                 $item["gravity"] = GRAVITY_ACTIVITY;
2171                                 // only one like or dislike per person
2172                                 // splitted into two queries for performance issues
2173                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2174                                         'verb' => $item["verb"], 'parent-uri' => $item["parent-uri"]];
2175                                 if (Item::exists($condition)) {
2176                                         return false;
2177                                 }
2178
2179                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2180                                         'verb' => $item["verb"], 'thr-parent' => $item["parent-uri"]];
2181                                 if (Item::exists($condition)) {
2182                                         return false;
2183                                 }
2184
2185                                 // The owner of an activity must be the author
2186                                 $item["owner-name"] = $item["author-name"];
2187                                 $item["owner-link"] = $item["author-link"];
2188                                 $item["owner-avatar"] = $item["author-avatar"];
2189                                 $item["owner-id"] = $item["author-id"];
2190                         } else {
2191                                 $is_like = false;
2192                         }
2193
2194                         if (($item["verb"] == Activity::TAG) && ($item["object-type"] == Activity\ObjectType::TAGTERM)) {
2195                                 $xo = XML::parseString($item["object"]);
2196                                 $xt = XML::parseString($item["target"]);
2197
2198                                 if ($xt->type == Activity\ObjectType::NOTE) {
2199                                         $item_tag = Item::selectFirst(['id', 'uri-id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
2200
2201                                         if (!DBA::isResult($item_tag)) {
2202                                                 Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2203                                                 return false;
2204                                         }
2205
2206                                         // extract tag, if not duplicate, add to parent item
2207                                         if ($xo->content) {
2208                                                 Tag::store($item_tag['uri-id'], Tag::HASHTAG, $xo->content);
2209                                         }
2210                                 }
2211                         }
2212                 }
2213                 return true;
2214         }
2215
2216         /**
2217          * Processes the link elements
2218          *
2219          * @param object $links link elements
2220          * @param array  $item  the item record
2221          * @return void
2222          * @todo set proper type-hints
2223          */
2224         private static function parseLinks($links, &$item)
2225         {
2226                 $rel = "";
2227                 $href = "";
2228                 $type = "";
2229                 $length = "0";
2230                 $title = "";
2231                 foreach ($links as $link) {
2232                         foreach ($link->attributes as $attributes) {
2233                                 switch ($attributes->name) {
2234                                         case "href"  : $href   = $attributes->textContent; break;
2235                                         case "rel"   : $rel    = $attributes->textContent; break;
2236                                         case "type"  : $type   = $attributes->textContent; break;
2237                                         case "length": $length = $attributes->textContent; break;
2238                                         case "title" : $title  = $attributes->textContent; break;
2239                                 }
2240                         }
2241                         if (($rel != "") && ($href != "")) {
2242                                 switch ($rel) {
2243                                         case "alternate":
2244                                                 $item["plink"] = $href;
2245                                                 break;
2246                                         case "enclosure":
2247                                                 if (!empty($item["attach"])) {
2248                                                         $item["attach"] .= ",";
2249                                                 } else {
2250                                                         $item["attach"] = "";
2251                                                 }
2252
2253                                                 $item["attach"] .= '[attach]href="' . $href . '" length="' . $length . '" type="' . $type . '" title="' . $title . '"[/attach]';
2254                                                 break;
2255                                 }
2256                         }
2257                 }
2258         }
2259
2260         /**
2261          * Processes the entry elements which contain the items and comments
2262          *
2263          * @param array  $header   Array of the header elements that always stay the same
2264          * @param object $xpath    XPath object
2265          * @param object $entry    entry elements
2266          * @param array  $importer Record of the importer user mixed with contact of the content
2267          * @param string $xml      xml
2268          * @return void
2269          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2270          * @throws \ImagickException
2271          * @todo  Add type-hints
2272          */
2273         private static function processEntry($header, $xpath, $entry, $importer, $xml)
2274         {
2275                 Logger::log("Processing entries");
2276
2277                 $item = $header;
2278
2279                 $item["protocol"] = Conversation::PARCEL_DFRN;
2280
2281                 $item["source"] = $xml;
2282
2283                 // Get the uri
2284                 $item["uri"] = XML::getFirstNodeValue($xpath, "atom:id/text()", $entry);
2285
2286                 $item["edited"] = XML::getFirstNodeValue($xpath, "atom:updated/text()", $entry);
2287
2288                 $current = Item::selectFirst(['id', 'uid', 'edited', 'body'],
2289                         ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]]
2290                 );
2291                 // Is there an existing item?
2292                 if (DBA::isResult($current) && !self::isEditedTimestampNewer($current, $item)) {
2293                         Logger::log("Item ".$item["uri"]." (".$item['edited'].") already existed.", Logger::DEBUG);
2294                         return;
2295                 }
2296
2297                 // Fetch the owner
2298                 $owner = self::fetchauthor($xpath, $entry, $importer, "dfrn:owner", true, $xml);
2299
2300                 $owner_unknown = (isset($owner["contact-unknown"]) && $owner["contact-unknown"]);
2301
2302                 $item["owner-name"] = $owner["name"];
2303                 $item["owner-link"] = $owner["link"];
2304                 $item["owner-avatar"] = $owner["avatar"];
2305                 $item["owner-id"] = Contact::getIdForURL($owner["link"], 0);
2306
2307                 // fetch the author
2308                 $author = self::fetchauthor($xpath, $entry, $importer, "atom:author", true, $xml);
2309
2310                 $item["author-name"] = $author["name"];
2311                 $item["author-link"] = $author["link"];
2312                 $item["author-avatar"] = $author["avatar"];
2313                 $item["author-id"] = Contact::getIdForURL($author["link"], 0);
2314
2315                 $item["title"] = XML::getFirstNodeValue($xpath, "atom:title/text()", $entry);
2316
2317                 $item["created"] = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2318
2319                 $item["body"] = XML::getFirstNodeValue($xpath, "dfrn:env/text()", $entry);
2320                 $item["body"] = str_replace([' ',"\t","\r","\n"], ['','','',''], $item["body"]);
2321
2322                 $item["body"] = Strings::base64UrlDecode($item["body"]);
2323
2324                 $item["body"] = BBCode::limitBodySize($item["body"]);
2325
2326                 /// @todo We should check for a repeated post and if we know the repeated author.
2327
2328                 // We don't need the content element since "dfrn:env" is always present
2329                 //$item["body"] = $xpath->query("atom:content/text()", $entry)->item(0)->nodeValue;
2330
2331                 $item["location"] = XML::getFirstNodeValue($xpath, "dfrn:location/text()", $entry);
2332
2333                 $item["coord"] = XML::getFirstNodeValue($xpath, "georss:point", $entry);
2334
2335                 $item["private"] = XML::getFirstNodeValue($xpath, "dfrn:private/text()", $entry);
2336
2337                 $unlisted = XML::getFirstNodeValue($xpath, "dfrn:unlisted/text()", $entry);
2338                 if (!empty($unlisted) && ($item['private'] != Item::PRIVATE)) {
2339                         $item['private'] = Item::UNLISTED;
2340                 }
2341
2342                 $item["extid"] = XML::getFirstNodeValue($xpath, "dfrn:extid/text()", $entry);
2343
2344                 if (XML::getFirstNodeValue($xpath, "dfrn:bookmark/text()", $entry) == "true") {
2345                         $item["post-type"] = Item::PT_PAGE;
2346                 }
2347
2348                 $notice_info = $xpath->query("statusnet:notice_info", $entry);
2349                 if ($notice_info && ($notice_info->length > 0)) {
2350                         foreach ($notice_info->item(0)->attributes as $attributes) {
2351                                 if ($attributes->name == "source") {
2352                                         $item["app"] = strip_tags($attributes->textContent);
2353                                 }
2354                         }
2355                 }
2356
2357                 $item["guid"] = XML::getFirstNodeValue($xpath, "dfrn:diaspora_guid/text()", $entry);
2358
2359                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
2360
2361                 Tag::storeFromBody($item['uri-id'], $item["body"]);
2362
2363                 // We store the data from "dfrn:diaspora_signature" in a different table, this is done in "Item::insert"
2364                 $dsprsig = XML::unescape(XML::getFirstNodeValue($xpath, "dfrn:diaspora_signature/text()", $entry));
2365                 if ($dsprsig != "") {
2366                         $signature = json_decode(base64_decode($dsprsig));
2367                         // We don't store the old style signatures anymore that also contained the "signature" and "signer"
2368                         if (!empty($signature->signed_text) && empty($signature->signature) && empty($signature->signer)) {
2369                                 $item["diaspora_signed_text"] = $signature->signed_text;
2370                         }
2371                 }
2372
2373                 $item["verb"] = XML::getFirstNodeValue($xpath, "activity:verb/text()", $entry);
2374
2375                 if (XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry) != "") {
2376                         $item["object-type"] = XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry);
2377                 }
2378
2379                 $object = $xpath->query("activity:object", $entry)->item(0);
2380                 $item["object"] = self::transformActivity($xpath, $object, "object");
2381
2382                 if (trim($item["object"]) != "") {
2383                         $r = XML::parseString($item["object"]);
2384                         if (isset($r->type)) {
2385                                 $item["object-type"] = $r->type;
2386                         }
2387                 }
2388
2389                 $target = $xpath->query("activity:target", $entry)->item(0);
2390                 $item["target"] = self::transformActivity($xpath, $target, "target");
2391
2392                 $categories = $xpath->query("atom:category", $entry);
2393                 if ($categories) {
2394                         foreach ($categories as $category) {
2395                                 $term = "";
2396                                 $scheme = "";
2397                                 foreach ($category->attributes as $attributes) {
2398                                         if ($attributes->name == "term") {
2399                                                 $term = $attributes->textContent;
2400                                         }
2401
2402                                         if ($attributes->name == "scheme") {
2403                                                 $scheme = $attributes->textContent;
2404                                         }
2405                                 }
2406
2407                                 if (($term != "") && ($scheme != "")) {
2408                                         $parts = explode(":", $scheme);
2409                                         if ((count($parts) >= 4) && (array_shift($parts) == "X-DFRN")) {
2410                                                 $termurl = array_pop($parts);
2411                                                 $termurl = array_pop($parts) . $termurl;
2412                                                 Tag::store($item['uri-id'], Tag::IMPLICIT_MENTION, $term, $termurl);
2413                                         }
2414                                 }
2415                         }
2416                 }
2417
2418                 $links = $xpath->query("atom:link", $entry);
2419                 if ($links) {
2420                         self::parseLinks($links, $item);
2421                 }
2422
2423                 $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
2424
2425                 $conv = $xpath->query('ostatus:conversation', $entry);
2426                 if (is_object($conv->item(0))) {
2427                         foreach ($conv->item(0)->attributes as $attributes) {
2428                                 if ($attributes->name == "ref") {
2429                                         $item['conversation-uri'] = $attributes->textContent;
2430                                 }
2431                                 if ($attributes->name == "href") {
2432                                         $item['conversation-href'] = $attributes->textContent;
2433                                 }
2434                         }
2435                 }
2436
2437                 // Is it a reply or a top level posting?
2438                 $item["parent-uri"] = $item["uri"];
2439
2440                 $inreplyto = $xpath->query("thr:in-reply-to", $entry);
2441                 if (is_object($inreplyto->item(0))) {
2442                         foreach ($inreplyto->item(0)->attributes as $attributes) {
2443                                 if ($attributes->name == "ref") {
2444                                         $item["parent-uri"] = $attributes->textContent;
2445                                 }
2446                         }
2447                 }
2448
2449                 // Get the type of the item (Top level post, reply or remote reply)
2450                 $entrytype = self::getEntryType($importer, $item);
2451
2452                 // Now assign the rest of the values that depend on the type of the message
2453                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2454                         if (!isset($item["object-type"])) {
2455                                 $item["object-type"] = Activity\ObjectType::COMMENT;
2456                         }
2457
2458                         if ($item["contact-id"] != $owner["contact-id"]) {
2459                                 $item["contact-id"] = $owner["contact-id"];
2460                         }
2461
2462                         if (($item["network"] != $owner["network"]) && ($owner["network"] != "")) {
2463                                 $item["network"] = $owner["network"];
2464                         }
2465
2466                         if ($item["contact-id"] != $author["contact-id"]) {
2467                                 $item["contact-id"] = $author["contact-id"];
2468                         }
2469
2470                         if (($item["network"] != $author["network"]) && ($author["network"] != "")) {
2471                                 $item["network"] = $author["network"];
2472                         }
2473                 }
2474
2475                 // Ensure to have the correct share data
2476                 $item = Item::addShareDataFromOriginal($item);
2477
2478                 if ($entrytype == DFRN::REPLY_RC) {
2479                         $item["wall"] = 1;
2480                 } elseif ($entrytype == DFRN::TOP_LEVEL) {
2481                         if (!isset($item["object-type"])) {
2482                                 $item["object-type"] = Activity\ObjectType::NOTE;
2483                         }
2484
2485                         // Is it an event?
2486                         if (($item["object-type"] == Activity\ObjectType::EVENT) && !$owner_unknown) {
2487                                 Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
2488                                 $ev = Event::fromBBCode($item["body"]);
2489                                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
2490                                         Logger::log("Event in item ".$item["uri"]." was found.", Logger::DEBUG);
2491                                         $ev["cid"]     = $importer["id"];
2492                                         $ev["uid"]     = $importer["importer_uid"];
2493                                         $ev["uri"]     = $item["uri"];
2494                                         $ev["edited"]  = $item["edited"];
2495                                         $ev["private"] = $item["private"];
2496                                         $ev["guid"]    = $item["guid"];
2497                                         $ev["plink"]   = $item["plink"];
2498
2499                                         $condition = ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]];
2500                                         $event = DBA::selectFirst('event', ['id'], $condition);
2501                                         if (DBA::isResult($event)) {
2502                                                 $ev["id"] = $event["id"];
2503                                         }
2504
2505                                         $event_id = Event::store($ev);
2506                                         Logger::log("Event ".$event_id." was stored", Logger::DEBUG);
2507                                         return;
2508                                 }
2509                         }
2510                 }
2511
2512                 if (!self::processVerbs($entrytype, $importer, $item, $is_like)) {
2513                         Logger::log("Exiting because 'processVerbs' told us so", Logger::DEBUG);
2514                         return;
2515                 }
2516
2517                 // This check is done here to be able to receive connection requests in "processVerbs"
2518                 if (($entrytype == DFRN::TOP_LEVEL) && $owner_unknown) {
2519                         Logger::log("Item won't be stored because user " . $importer["importer_uid"] . " doesn't follow " . $item["owner-link"] . ".", Logger::DEBUG);
2520                         return;
2521                 }
2522
2523
2524                 // Update content if 'updated' changes
2525                 if (DBA::isResult($current)) {
2526                         if (self::updateContent($current, $item, $importer, $entrytype)) {
2527                                 Logger::log("Item ".$item["uri"]." was updated.", Logger::DEBUG);
2528                         } else {
2529                                 Logger::log("Item " . $item["uri"] . " already existed.", Logger::DEBUG);
2530                         }
2531                         return;
2532                 }
2533
2534                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2535                         $posted_id = Item::insert($item);
2536                         if ($posted_id) {
2537                                 Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
2538
2539                                 if ($item['uid'] == 0) {
2540                                         Item::distribute($posted_id);
2541                                 }
2542
2543                                 return true;
2544                         }
2545                 } else { // $entrytype == DFRN::TOP_LEVEL
2546                         if (($importer["uid"] == 0) && ($importer["importer_uid"] != 0)) {
2547                                 Logger::log("Contact ".$importer["id"]." isn't known to user ".$importer["importer_uid"].". The post will be ignored.", Logger::DEBUG);
2548                                 return;
2549                         }
2550                         if (!Strings::compareLink($item["owner-link"], $importer["url"])) {
2551                                 /*
2552                                  * The item owner info is not our contact. It's OK and is to be expected if this is a tgroup delivery,
2553                                  * but otherwise there's a possible data mixup on the sender's system.
2554                                  * the tgroup delivery code called from Item::insert will correct it if it's a forum,
2555                                  * but we're going to unconditionally correct it here so that the post will always be owned by our contact.
2556                                  */
2557                                 Logger::log('Correcting item owner.', Logger::DEBUG);
2558                                 $item["owner-link"] = $importer["url"];
2559                                 $item["owner-id"] = Contact::getIdForURL($importer["url"], 0);
2560                         }
2561
2562                         if (($importer["rel"] == Contact::FOLLOWER) && (!self::tgroupCheck($importer["importer_uid"], $item))) {
2563                                 Logger::log("Contact ".$importer["id"]." is only follower and tgroup check was negative.", Logger::DEBUG);
2564                                 return;
2565                         }
2566
2567                         // This is my contact on another system, but it's really me.
2568                         // Turn this into a wall post.
2569                         $notify = Item::isRemoteSelf($importer, $item);
2570
2571                         $posted_id = Item::insert($item, $notify);
2572
2573                         if ($notify) {
2574                                 $posted_id = $notify;
2575                         }
2576
2577                         Logger::log("Item was stored with id ".$posted_id, Logger::DEBUG);
2578
2579                         if ($item['uid'] == 0) {
2580                                 Item::distribute($posted_id);
2581                         }
2582
2583                         if (stristr($item["verb"], Activity::POKE)) {
2584                                 $item['id'] = $posted_id;
2585                                 self::doPoke($item, $importer);
2586                         }
2587                 }
2588         }
2589
2590         /**
2591          * Deletes items
2592          *
2593          * @param object $xpath    XPath object
2594          * @param object $deletion deletion elements
2595          * @param array  $importer Record of the importer user mixed with contact of the content
2596          * @return void
2597          * @throws \Exception
2598          * @todo  set proper type-hints
2599          */
2600         private static function processDeletion($xpath, $deletion, $importer)
2601         {
2602                 Logger::log("Processing deletions");
2603                 $uri = null;
2604
2605                 foreach ($deletion->attributes as $attributes) {
2606                         if ($attributes->name == "ref") {
2607                                 $uri = $attributes->textContent;
2608                         }
2609                 }
2610
2611                 if (!$uri || !$importer["id"]) {
2612                         return false;
2613                 }
2614
2615                 $condition = ['uri' => $uri, 'uid' => $importer["importer_uid"]];
2616                 $item = Item::selectFirst(['id', 'parent', 'contact-id', 'file', 'deleted', 'gravity'], $condition);
2617                 if (!DBA::isResult($item)) {
2618                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " wasn't found.", Logger::DEBUG);
2619                         return;
2620                 }
2621
2622                 if (strstr($item['file'], '[')) {
2623                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " is filed. So it won't be deleted.", Logger::DEBUG);
2624                         return;
2625                 }
2626
2627                 // When it is a starting post it has to belong to the person that wants to delete it
2628                 if (($item['gravity'] == GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2629                         Logger::log("Item with uri " . $uri . " don't belong to contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2630                         return;
2631                 }
2632
2633                 // Comments can be deleted by the thread owner or comment owner
2634                 if (($item['gravity'] != GRAVITY_PARENT) && ($item['contact-id'] != $importer["id"])) {
2635                         $condition = ['id' => $item['parent'], 'contact-id' => $importer["id"]];
2636                         if (!Item::exists($condition)) {
2637                                 Logger::log("Item with uri " . $uri . " wasn't found or mustn't be deleted by contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2638                                 return;
2639                         }
2640                 }
2641
2642                 if ($item["deleted"]) {
2643                         return;
2644                 }
2645
2646                 Logger::log('deleting item '.$item['id'].' uri='.$uri, Logger::DEBUG);
2647
2648                 Item::markForDeletion(['id' => $item['id']]);
2649         }
2650
2651         /**
2652          * Imports a DFRN message
2653          *
2654          * @param string $xml          The DFRN message
2655          * @param array  $importer     Record of the importer user mixed with contact of the content
2656          * @param bool   $sort_by_date Is used when feeds are polled
2657          * @return integer Import status
2658          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2659          * @throws \ImagickException
2660          * @todo  set proper type-hints
2661          */
2662         public static function import($xml, $importer, $sort_by_date = false)
2663         {
2664                 if ($xml == "") {
2665                         return 400;
2666                 }
2667
2668                 $doc = new DOMDocument();
2669                 @$doc->loadXML($xml);
2670
2671                 $xpath = new DOMXPath($doc);
2672                 $xpath->registerNamespace("atom", ActivityNamespace::ATOM1);
2673                 $xpath->registerNamespace("thr", ActivityNamespace::THREAD);
2674                 $xpath->registerNamespace("at", ActivityNamespace::TOMB);
2675                 $xpath->registerNamespace("media", ActivityNamespace::MEDIA);
2676                 $xpath->registerNamespace("dfrn", ActivityNamespace::DFRN);
2677                 $xpath->registerNamespace("activity", ActivityNamespace::ACTIVITY);
2678                 $xpath->registerNamespace("georss", ActivityNamespace::GEORSS);
2679                 $xpath->registerNamespace("poco", ActivityNamespace::POCO);
2680                 $xpath->registerNamespace("ostatus", ActivityNamespace::OSTATUS);
2681                 $xpath->registerNamespace("statusnet", ActivityNamespace::STATUSNET);
2682
2683                 $header = [];
2684                 $header["uid"] = $importer["importer_uid"];
2685                 $header["network"] = Protocol::DFRN;
2686                 $header["wall"] = 0;
2687                 $header["origin"] = 0;
2688                 $header["contact-id"] = $importer["id"];
2689
2690                 // Update the contact table if the data has changed
2691
2692                 // The "atom:author" is only present in feeds
2693                 if ($xpath->query("/atom:feed/atom:author")->length > 0) {
2694                         self::fetchauthor($xpath, $doc->firstChild, $importer, "atom:author", false, $xml);
2695                 }
2696
2697                 // Only the "dfrn:owner" in the head section contains all data
2698                 if ($xpath->query("/atom:feed/dfrn:owner")->length > 0) {
2699                         self::fetchauthor($xpath, $doc->firstChild, $importer, "dfrn:owner", false, $xml);
2700                 }
2701
2702                 Logger::log("Import DFRN message for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2703
2704                 // is it a public forum? Private forums aren't exposed with this method
2705                 $forum = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:community/text()"));
2706
2707                 // The account type is new since 3.5.1
2708                 if ($xpath->query("/atom:feed/dfrn:account_type")->length > 0) {
2709                         // Hint: We are using separate update calls for uid=0 and uid!=0 since a combined call is bad for the database performance
2710
2711                         $accounttype = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:account_type/text()"));
2712
2713                         if ($accounttype != $importer["contact-type"]) {
2714                                 DBA::update('contact', ['contact-type' => $accounttype], ['id' => $importer['id']]);
2715
2716                                 // Updating the public contact as well
2717                                 DBA::update('contact', ['contact-type' => $accounttype], ['uid' => 0, 'nurl' => $importer['nurl']]);
2718                         }
2719                         // A forum contact can either have set "forum" or "prv" - but not both
2720                         if ($accounttype == User::ACCOUNT_TYPE_COMMUNITY) {
2721                                 // It's a forum, so either set the public or private forum flag
2722                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `id` = ?', $forum, !$forum, $importer['id']];
2723                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2724
2725                                 // Updating the public contact as well
2726                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `uid` = 0 AND `nurl` = ?', $forum, !$forum, $importer['nurl']];
2727                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2728                         } else {
2729                                 // It's not a forum, so remove the flags
2730                                 $condition = ['(`forum` OR `prv`) AND `id` = ?', $importer['id']];
2731                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2732
2733                                 // Updating the public contact as well
2734                                 $condition = ['(`forum` OR `prv`) AND `uid` = 0 AND `nurl` = ?', $importer['nurl']];
2735                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2736                         }
2737                 } elseif ($forum != $importer["forum"]) { // Deprecated since 3.5.1
2738                         $condition = ['`forum` != ? AND `id` = ?', $forum, $importer["id"]];
2739                         DBA::update('contact', ['forum' => $forum], $condition);
2740
2741                         // Updating the public contact as well
2742                         $condition = ['`forum` != ? AND `uid` = 0 AND `nurl` = ?', $forum, $importer['nurl']];
2743                         DBA::update('contact', ['forum' => $forum], $condition);
2744                 }
2745
2746
2747                 // We are processing relocations even if we are ignoring a contact
2748                 $relocations = $xpath->query("/atom:feed/dfrn:relocate");
2749                 foreach ($relocations as $relocation) {
2750                         self::processRelocation($xpath, $relocation, $importer);
2751                 }
2752
2753                 if (($importer["uid"] != 0) && !$importer["readonly"]) {
2754                         $mails = $xpath->query("/atom:feed/dfrn:mail");
2755                         foreach ($mails as $mail) {
2756                                 self::processMail($xpath, $mail, $importer);
2757                         }
2758
2759                         $suggestions = $xpath->query("/atom:feed/dfrn:suggest");
2760                         foreach ($suggestions as $suggestion) {
2761                                 self::processSuggestion($xpath, $suggestion, $importer);
2762                         }
2763                 }
2764
2765                 $deletions = $xpath->query("/atom:feed/at:deleted-entry");
2766                 foreach ($deletions as $deletion) {
2767                         self::processDeletion($xpath, $deletion, $importer);
2768                 }
2769
2770                 if (!$sort_by_date) {
2771                         $entries = $xpath->query("/atom:feed/atom:entry");
2772                         foreach ($entries as $entry) {
2773                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2774                         }
2775                 } else {
2776                         $newentries = [];
2777                         $entries = $xpath->query("/atom:feed/atom:entry");
2778                         foreach ($entries as $entry) {
2779                                 $created = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2780                                 $newentries[strtotime($created)] = $entry;
2781                         }
2782
2783                         // Now sort after the publishing date
2784                         ksort($newentries);
2785
2786                         foreach ($newentries as $entry) {
2787                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2788                         }
2789                 }
2790                 Logger::log("Import done for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2791                 return 200;
2792         }
2793
2794         /**
2795          * Returns the activity verb
2796          *
2797          * @param array $item Item array
2798          *
2799          * @return string activity verb
2800          */
2801         private static function constructVerb(array $item)
2802         {
2803                 if ($item['verb']) {
2804                         return $item['verb'];
2805                 }
2806                 return Activity::POST;
2807         }
2808
2809         private static function tgroupCheck($uid, $item)
2810         {
2811                 $mention = false;
2812
2813                 // check that the message originated elsewhere and is a top-level post
2814
2815                 if ($item['wall'] || $item['origin'] || ($item['uri'] != $item['parent-uri'])) {
2816                         return false;
2817                 }
2818
2819                 $user = DBA::selectFirst('user', ['page-flags', 'nickname'], ['uid' => $uid]);
2820                 if (!DBA::isResult($user)) {
2821                         return false;
2822                 }
2823
2824                 $community_page = ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY);
2825                 $prvgroup = ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP);
2826
2827                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
2828
2829                 /*
2830                  * Diaspora uses their own hardwired link URL in @-tags
2831                  * instead of the one we supply with webfinger
2832                  */
2833                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
2834
2835                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2836                 if ($cnt) {
2837                         foreach ($matches as $mtch) {
2838                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2839                                         $mention = true;
2840                                         Logger::log('mention found: ' . $mtch[2]);
2841                                 }
2842                         }
2843                 }
2844
2845                 if (!$mention) {
2846                         return false;
2847                 }
2848
2849                 return $community_page || $prvgroup;
2850         }
2851
2852         /**
2853          * This function returns true if $update has an edited timestamp newer
2854          * than $existing, i.e. $update contains new data which should override
2855          * what's already there.  If there is no timestamp yet, the update is
2856          * assumed to be newer.  If the update has no timestamp, the existing
2857          * item is assumed to be up-to-date.  If the timestamps are equal it
2858          * assumes the update has been seen before and should be ignored.
2859          *
2860          * @param $existing
2861          * @param $update
2862          * @return bool
2863          * @throws \Exception
2864          */
2865         private static function isEditedTimestampNewer($existing, $update)
2866         {
2867                 if (empty($existing['edited'])) {
2868                         return true;
2869                 }
2870                 if (empty($update['edited'])) {
2871                         return false;
2872                 }
2873
2874                 $existing_edited = DateTimeFormat::utc($existing['edited']);
2875                 $update_edited = DateTimeFormat::utc($update['edited']);
2876
2877                 return (strcmp($existing_edited, $update_edited) < 0);
2878         }
2879
2880         /**
2881          * Checks if the given contact url does support DFRN
2882          *
2883          * @param string  $url    profile url
2884          * @return boolean
2885          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2886          * @throws \ImagickException
2887          */
2888         public static function isSupportedByContactUrl($url)
2889         {
2890                 $probe = Probe::uri($url, Protocol::DFRN);
2891                 return $probe['network'] == Protocol::DFRN;
2892         }
2893 }