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