src/Protocol/DFRN.php

   1 <?php
   2 /**
   3  * @file include/dfrn.php
   4  * @brief The implementation of the dfrn protocol
   5  *
   6  * @see https://github.com/friendica/friendica/wiki/Protocol and
   7  * https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
   8  */
   9 namespace Friendica\Protocol;
  10
  11 use DOMDocument;
  12 use DOMXPath;
  13 use Friendica\App;
  14 use Friendica\Content\OEmbed;
  15 use Friendica\Content\Text\BBCode;
  16 use Friendica\Content\Text\HTML;
  17 use Friendica\Core\Config;
  18 use Friendica\Core\Hook;
  19 use Friendica\Core\Logger;
  20 use Friendica\Core\Protocol;
  21 use Friendica\Core\System;
  22 use Friendica\Database\DBA;
  23 use Friendica\Model\Contact;
  24 use Friendica\Model\Conversation;
  25 use Friendica\Model\Event;
  26 use Friendica\Model\GContact;
  27 use Friendica\Model\Item;
  28 use Friendica\Model\Mail;
  29 use Friendica\Model\PermissionSet;
  30 use Friendica\Model\Profile;
  31 use Friendica\Model\User;
  32 use Friendica\Network\Probe;
  33 use Friendica\Object\Image;
  34 use Friendica\Util\BaseURL;
  35 use Friendica\Util\Crypto;
  36 use Friendica\Util\DateTimeFormat;
  37 use Friendica\Util\Network;
  38 use Friendica\Util\Strings;
  39 use Friendica\Util\XML;
  40 use HTMLPurifier;
  41 use HTMLPurifier_Config;
  42
  43 /**
  44  * @brief This class contain functions to create and send DFRN XML files
  45  */
  46 class DFRN
  47 {
  48
  49         const TOP_LEVEL = 0;    // Top level posting
  50         const REPLY = 1;                // Regular reply that is stored locally
  51         const REPLY_RC = 2;     // Reply that will be relayed
  52
  53         /**
  54          * @brief Generates an array of contact and user for DFRN imports
  55          *
  56          * This array contains not only the receiver but also the sender of the message.
  57          *
  58          * @param integer $cid Contact id
  59          * @param integer $uid User id
  60          *
  61          * @return array importer
  62          * @throws \Exception
  63          */
  64         public static function getImporter($cid, $uid = 0)
  65         {
  66                 $condition = ['id' => $cid, 'blocked' => false, 'pending' => false];
  67                 $contact = DBA::selectFirst('contact', [], $condition);
  68                 if (!DBA::isResult($contact)) {
  69                         return [];
  70                 }
  71
  72                 $contact['cpubkey'] = $contact['pubkey'];
  73                 $contact['cprvkey'] = $contact['prvkey'];
  74                 $contact['senderName'] = $contact['name'];
  75
  76                 if ($uid != 0) {
  77                         $condition = ['uid' => $uid, 'account_expired' => false, 'account_removed' => false];
  78                         $user = DBA::selectFirst('user', [], $condition);
  79                         if (!DBA::isResult($user)) {
  80                                 return [];
  81                         }
  82
  83                         $user['importer_uid'] = $user['uid'];
  84                         $user['uprvkey'] = $user['prvkey'];
  85                 } else {
  86                         $user = ['importer_uid' => 0, 'uprvkey' => '', 'timezone' => 'UTC',
  87                                 'nickname' => '', 'sprvkey' => '', 'spubkey' => '',
  88                                 'page-flags' => 0, 'account-type' => 0, 'prvnets' => 0];
  89                 }
  90
  91                 return array_merge($contact, $user);
  92         }
  93
  94         /**
  95          * @brief Generates the atom entries for delivery.php
  96          *
  97          * This function is used whenever content is transmitted via DFRN.
  98          *
  99          * @param array $items Item elements
 100          * @param array $owner Owner record
 101          *
 102          * @return string DFRN entries
 103          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 104          * @throws \ImagickException
 105          * @todo  Find proper type-hints
 106          */
 107         public static function entries($items, $owner)
 108         {
 109                 $doc = new DOMDocument('1.0', 'utf-8');
 110                 $doc->formatOutput = true;
 111
 112                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 113
 114                 if (! count($items)) {
 115                         return trim($doc->saveXML());
 116                 }
 117
 118                 foreach ($items as $item) {
 119                         // These values aren't sent when sending from the queue.
 120                         /// @todo Check if we can set these values from the queue or if they are needed at all.
 121                         $item["entry:comment-allow"] = defaults($item, "entry:comment-allow", true);
 122                         $item["entry:cid"] = defaults($item, "entry:cid", 0);
 123
 124                         $entry = self::entry($doc, "text", $item, $owner, $item["entry:comment-allow"], $item["entry:cid"]);
 125                         if (isset($entry)) {
 126                                 $root->appendChild($entry);
 127                         }
 128                 }
 129
 130                 return trim($doc->saveXML());
 131         }
 132
 133         /**
 134          * @brief Generate an atom feed for the given user
 135          *
 136          * This function is called when another server is pulling data from the user feed.
 137          *
 138          * @param string  $dfrn_id     DFRN ID from the requesting party
 139          * @param string  $owner_nick  Owner nick name
 140          * @param string  $last_update Date of the last update
 141          * @param int     $direction   Can be -1, 0 or 1.
 142          * @param boolean $onlyheader  Output only the header without content? (Default is "no")
 143          *
 144          * @return string DFRN feed entries
 145          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 146          * @throws \ImagickException
 147          */
 148         public static function feed($dfrn_id, $owner_nick, $last_update, $direction = 0, $onlyheader = false)
 149         {
 150                 $a = \get_app();
 151
 152                 $sitefeed    = ((strlen($owner_nick)) ? false : true); // not yet implemented, need to rewrite huge chunks of following logic
 153                 $public_feed = (($dfrn_id) ? false : true);
 154                 $starred     = false;   // not yet implemented, possible security issues
 155                 $converse    = false;
 156
 157                 if ($public_feed && $a->argc > 2) {
 158                         for ($x = 2; $x < $a->argc; $x++) {
 159                                 if ($a->argv[$x] == 'converse') {
 160                                         $converse = true;
 161                                 }
 162                                 if ($a->argv[$x] == 'starred') {
 163                                         $starred = true;
 164                                 }
 165                                 if ($a->argv[$x] == 'category' && $a->argc > ($x + 1) && strlen($a->argv[$x+1])) {
 166                                         $category = $a->argv[$x+1];
 167                                 }
 168                         }
 169                 }
 170
 171                 // default permissions - anonymous user
 172
 173                 $sql_extra = " AND NOT `item`.`private` ";
 174
 175                 $r = q(
 176                         "SELECT `contact`.*, `user`.`nickname`, `user`.`timezone`, `user`.`page-flags`, `user`.`account-type`
 177                         FROM `contact` INNER JOIN `user` ON `user`.`uid` = `contact`.`uid`
 178                         WHERE `contact`.`self` AND `user`.`nickname` = '%s' LIMIT 1",
 179                         DBA::escape($owner_nick)
 180                 );
 181
 182                 if (! DBA::isResult($r)) {
 183                         Logger::log(sprintf('No contact found for nickname=%d', $owner_nick), Logger::WARNING);
 184                         exit();
 185                 }
 186
 187                 $owner = $r[0];
 188                 $owner_id = $owner['uid'];
 189
 190                 $sql_post_table = "";
 191
 192                 if (! $public_feed) {
 193                         switch ($direction) {
 194                                 case (-1):
 195                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 196                                         break;
 197                                 case 0:
 198                                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 199                                         break;
 200                                 case 1:
 201                                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 202                                         break;
 203                                 default:
 204                                         return false;
 205                                         break; // NOTREACHED
 206                         }
 207
 208                         $r = q(
 209                                 "SELECT * FROM `contact` WHERE NOT `blocked` AND `contact`.`uid` = %d $sql_extra LIMIT 1",
 210                                 intval($owner_id)
 211                         );
 212
 213                         if (! DBA::isResult($r)) {
 214                                 Logger::log(sprintf('No contact found for uid=%d', $owner_id), Logger::WARNING);
 215                                 exit();
 216                         }
 217
 218                         $contact = $r[0];
 219
 220                         $set = PermissionSet::get($owner_id, $contact['id']);
 221
 222                         if (!empty($set)) {
 223                                 $sql_extra = " AND `item`.`psid` IN (" . implode(',', $set) .")";
 224                         } else {
 225                                 $sql_extra = " AND NOT `item`.`private`";
 226                         }
 227                 }
 228
 229                 if ($public_feed) {
 230                         $sort = 'DESC';
 231                 } else {
 232                         $sort = 'ASC';
 233                 }
 234
 235                 if (! strlen($last_update)) {
 236                         $last_update = 'now -30 days';
 237                 }
 238
 239                 if (isset($category)) {
 240                         $sql_post_table = sprintf(
 241                                 "INNER JOIN (SELECT `oid` FROM `term` WHERE `term` = '%s' AND `otype` = %d AND `type` = %d AND `uid` = %d ORDER BY `tid` DESC) AS `term` ON `item`.`id` = `term`.`oid` ",
 242                                 DBA::escape(Strings::protectSprintf($category)),
 243                                 intval(TERM_OBJ_POST),
 244                                 intval(TERM_CATEGORY),
 245                                 intval($owner_id)
 246                         );
 247                 }
 248
 249                 if ($public_feed && ! $converse) {
 250                         $sql_extra .= " AND `contact`.`self` = 1 ";
 251                 }
 252
 253                 $check_date = DateTimeFormat::utc($last_update);
 254
 255                 $r = q(
 256                         "SELECT `item`.`id`
 257                         FROM `item` USE INDEX (`uid_wall_changed`) $sql_post_table
 258                         STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
 259                         WHERE `item`.`uid` = %d AND `item`.`wall` AND `item`.`changed` > '%s'
 260                         AND `item`.`visible` $sql_extra
 261                         ORDER BY `item`.`parent` ".$sort.", `item`.`received` ASC LIMIT 0, 300",
 262                         intval($owner_id),
 263                         DBA::escape($check_date),
 264                         DBA::escape($sort)
 265                 );
 266
 267                 $ids = [];
 268                 foreach ($r as $item) {
 269                         $ids[] = $item['id'];
 270                 }
 271
 272                 if (!empty($ids)) {
 273                         $ret = Item::select(Item::DELIVER_FIELDLIST, ['id' => $ids]);
 274                         $items = Item::inArray($ret);
 275                 } else {
 276                         $items = [];
 277                 }
 278
 279                 /*
 280                  * Will check further below if this actually returned results.
 281                  * We will provide an empty feed if that is the case.
 282                  */
 283
 284                 $doc = new DOMDocument('1.0', 'utf-8');
 285                 $doc->formatOutput = true;
 286
 287                 $alternatelink = $owner['url'];
 288
 289                 if (isset($category)) {
 290                         $alternatelink .= "/category/".$category;
 291                 }
 292
 293                 if ($public_feed) {
 294                         $author = "dfrn:owner";
 295                 } else {
 296                         $author = "author";
 297                 }
 298
 299                 $root = self::addHeader($doc, $owner, $author, $alternatelink, true);
 300
 301                 /// @TODO This hook can't work anymore
 302                 //      \Friendica\Core\Hook::callAll('atom_feed', $atom);
 303
 304                 if (!DBA::isResult($items) || $onlyheader) {
 305                         $atom = trim($doc->saveXML());
 306
 307                         Hook::callAll('atom_feed_end', $atom);
 308
 309                         return $atom;
 310                 }
 311
 312                 foreach ($items as $item) {
 313                         // prevent private email from leaking.
 314                         if ($item['network'] == Protocol::MAIL) {
 315                                 continue;
 316                         }
 317
 318                         // public feeds get html, our own nodes use bbcode
 319
 320                         if ($public_feed) {
 321                                 $type = 'html';
 322                                 // catch any email that's in a public conversation and make sure it doesn't leak
 323                                 if ($item['private']) {
 324                                         continue;
 325                                 }
 326                         } else {
 327                                 $type = 'text';
 328                         }
 329
 330                         $entry = self::entry($doc, $type, $item, $owner, true);
 331                         if (isset($entry)) {
 332                                 $root->appendChild($entry);
 333                         }
 334                 }
 335
 336                 $atom = trim($doc->saveXML());
 337
 338                 Hook::callAll('atom_feed_end', $atom);
 339
 340                 return $atom;
 341         }
 342
 343         /**
 344          * @brief Generate an atom entry for a given item id
 345          *
 346          * @param int     $item_id      The item id
 347          * @param boolean $conversation Show the conversation. If false show the single post.
 348          *
 349          * @return string DFRN feed entry
 350          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 351          * @throws \ImagickException
 352          */
 353         public static function itemFeed($item_id, $conversation = false)
 354         {
 355                 if ($conversation) {
 356                         $condition = ['parent' => $item_id];
 357                 } else {
 358                         $condition = ['id' => $item_id];
 359                 }
 360
 361                 $ret = Item::select(Item::DELIVER_FIELDLIST, $condition);
 362                 $items = Item::inArray($ret);
 363                 if (!DBA::isResult($items)) {
 364                         return '';
 365                 }
 366
 367                 $item = $items[0];
 368
 369                 if ($item['uid'] != 0) {
 370                         $owner = User::getOwnerDataById($item['uid']);
 371                         if (!$owner) {
 372                                 return '';
 373                         }
 374                 } else {
 375                         $owner = ['uid' => 0, 'nick' => 'feed-item'];
 376                 }
 377
 378                 $doc = new DOMDocument('1.0', 'utf-8');
 379                 $doc->formatOutput = true;
 380                 $type = 'html';
 381
 382                 if ($conversation) {
 383                         $root = $doc->createElementNS(NAMESPACE_ATOM1, 'feed');
 384                         $doc->appendChild($root);
 385
 386                         $root->setAttribute("xmlns:thr", NAMESPACE_THREAD);
 387                         $root->setAttribute("xmlns:at", NAMESPACE_TOMB);
 388                         $root->setAttribute("xmlns:media", NAMESPACE_MEDIA);
 389                         $root->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
 390                         $root->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
 391                         $root->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
 392                         $root->setAttribute("xmlns:poco", NAMESPACE_POCO);
 393                         $root->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
 394                         $root->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
 395
 396                         //$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 397
 398                         foreach ($items as $item) {
 399                                 $entry = self::entry($doc, $type, $item, $owner, true, 0);
 400                                 if (isset($entry)) {
 401                                         $root->appendChild($entry);
 402                                 }
 403                         }
 404                 } else {
 405                         self::entry($doc, $type, $item, $owner, true, 0, true);
 406                 }
 407
 408                 $atom = trim($doc->saveXML());
 409                 return $atom;
 410         }
 411
 412         /**
 413          * @brief Create XML text for DFRN mails
 414          *
 415          * @param array $item  message elements
 416          * @param array $owner Owner record
 417          *
 418          * @return string DFRN mail
 419          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 420          * @todo  Find proper type-hints
 421          */
 422         public static function mail($item, $owner)
 423         {
 424                 $doc = new DOMDocument('1.0', 'utf-8');
 425                 $doc->formatOutput = true;
 426
 427                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 428
 429                 $mail = $doc->createElement("dfrn:mail");
 430                 $sender = $doc->createElement("dfrn:sender");
 431
 432                 XML::addElement($doc, $sender, "dfrn:name", $owner['name']);
 433                 XML::addElement($doc, $sender, "dfrn:uri", $owner['url']);
 434                 XML::addElement($doc, $sender, "dfrn:avatar", $owner['thumb']);
 435
 436                 $mail->appendChild($sender);
 437
 438                 XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 439                 XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
 440                 XML::addElement($doc, $mail, "dfrn:sentdate", DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
 441                 XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 442                 XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 443
 444                 $root->appendChild($mail);
 445
 446                 return trim($doc->saveXML());
 447         }
 448
 449         /**
 450          * @brief Create XML text for DFRN friend suggestions
 451          *
 452          * @param array $item  suggestion elements
 453          * @param array $owner Owner record
 454          *
 455          * @return string DFRN suggestions
 456          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 457          * @todo  Find proper type-hints
 458          */
 459         public static function fsuggest($item, $owner)
 460         {
 461                 $doc = new DOMDocument('1.0', 'utf-8');
 462                 $doc->formatOutput = true;
 463
 464                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 465
 466                 $suggest = $doc->createElement("dfrn:suggest");
 467
 468                 XML::addElement($doc, $suggest, "dfrn:url", $item['url']);
 469                 XML::addElement($doc, $suggest, "dfrn:name", $item['name']);
 470                 XML::addElement($doc, $suggest, "dfrn:photo", $item['photo']);
 471                 XML::addElement($doc, $suggest, "dfrn:request", $item['request']);
 472                 XML::addElement($doc, $suggest, "dfrn:note", $item['note']);
 473
 474                 $root->appendChild($suggest);
 475
 476                 return trim($doc->saveXML());
 477         }
 478
 479         /**
 480          * @brief Create XML text for DFRN relocations
 481          *
 482          * @param array $owner Owner record
 483          * @param int   $uid   User ID
 484          *
 485          * @return string DFRN relocations
 486          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 487          * @todo  Find proper type-hints
 488          */
 489         public static function relocate($owner, $uid)
 490         {
 491
 492                 /* get site pubkey. this could be a new installation with no site keys*/
 493                 $pubkey = Config::get('system', 'site_pubkey');
 494                 if (! $pubkey) {
 495                         $res = Crypto::newKeypair(1024);
 496                         Config::set('system', 'site_prvkey', $res['prvkey']);
 497                         Config::set('system', 'site_pubkey', $res['pubkey']);
 498                 }
 499
 500                 $rp = q(
 501                         "SELECT `resource-id` , `scale`, type FROM `photo`
 502                                 WHERE `profile` = 1 AND `uid` = %d ORDER BY scale;",
 503                         $uid
 504                 );
 505                 $photos = [];
 506                 $ext = Image::supportedTypes();
 507
 508                 foreach ($rp as $p) {
 509                         $photos[$p['scale']] = System::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
 510                 }
 511
 512
 513                 $doc = new DOMDocument('1.0', 'utf-8');
 514                 $doc->formatOutput = true;
 515
 516                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 517
 518                 $relocate = $doc->createElement("dfrn:relocate");
 519
 520                 XML::addElement($doc, $relocate, "dfrn:url", $owner['url']);
 521                 XML::addElement($doc, $relocate, "dfrn:name", $owner['name']);
 522                 XML::addElement($doc, $relocate, "dfrn:addr", $owner['addr']);
 523                 XML::addElement($doc, $relocate, "dfrn:avatar", $owner['avatar']);
 524                 XML::addElement($doc, $relocate, "dfrn:photo", $photos[4]);
 525                 XML::addElement($doc, $relocate, "dfrn:thumb", $photos[5]);
 526                 XML::addElement($doc, $relocate, "dfrn:micro", $photos[6]);
 527                 XML::addElement($doc, $relocate, "dfrn:request", $owner['request']);
 528                 XML::addElement($doc, $relocate, "dfrn:confirm", $owner['confirm']);
 529                 XML::addElement($doc, $relocate, "dfrn:notify", $owner['notify']);
 530                 XML::addElement($doc, $relocate, "dfrn:poll", $owner['poll']);
 531                 XML::addElement($doc, $relocate, "dfrn:sitepubkey", Config::get('system', 'site_pubkey'));
 532
 533                 $root->appendChild($relocate);
 534
 535                 return trim($doc->saveXML());
 536         }
 537
 538         /**
 539          * @brief Adds the header elements for the DFRN protocol
 540          *
 541          * @param DOMDocument $doc           XML document
 542          * @param array       $owner         Owner record
 543          * @param string      $authorelement Element name for the author
 544          * @param string      $alternatelink link to profile or category
 545          * @param bool        $public        Is it a header for public posts?
 546          *
 547          * @return object XML root object
 548          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 549          * @todo  Find proper type-hints
 550          */
 551         private static function addHeader(DOMDocument $doc, $owner, $authorelement, $alternatelink = "", $public = false)
 552         {
 553
 554                 if ($alternatelink == "") {
 555                         $alternatelink = $owner['url'];
 556                 }
 557
 558                 $root = $doc->createElementNS(NAMESPACE_ATOM1, 'feed');
 559                 $doc->appendChild($root);
 560
 561                 $root->setAttribute("xmlns:thr", NAMESPACE_THREAD);
 562                 $root->setAttribute("xmlns:at", NAMESPACE_TOMB);
 563                 $root->setAttribute("xmlns:media", NAMESPACE_MEDIA);
 564                 $root->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
 565                 $root->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
 566                 $root->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
 567                 $root->setAttribute("xmlns:poco", NAMESPACE_POCO);
 568                 $root->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
 569                 $root->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
 570
 571                 XML::addElement($doc, $root, "id", System::baseUrl()."/profile/".$owner["nick"]);
 572                 XML::addElement($doc, $root, "title", $owner["name"]);
 573
 574                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION];
 575                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 576
 577                 $attributes = ["rel" => "license", "href" => "http://creativecommons.org/licenses/by/3.0/"];
 578                 XML::addElement($doc, $root, "link", "", $attributes);
 579
 580                 $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $alternatelink];
 581                 XML::addElement($doc, $root, "link", "", $attributes);
 582
 583
 584                 if ($public) {
 585                         // DFRN itself doesn't uses this. But maybe someone else wants to subscribe to the public feed.
 586                         OStatus::hublinks($doc, $root, $owner["nick"]);
 587
 588                         $attributes = ["rel" => "salmon", "href" => System::baseUrl()."/salmon/".$owner["nick"]];
 589                         XML::addElement($doc, $root, "link", "", $attributes);
 590
 591                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-replies", "href" => System::baseUrl()."/salmon/".$owner["nick"]];
 592                         XML::addElement($doc, $root, "link", "", $attributes);
 593
 594                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-mention", "href" => System::baseUrl()."/salmon/".$owner["nick"]];
 595                         XML::addElement($doc, $root, "link", "", $attributes);
 596                 }
 597
 598                 // For backward compatibility we keep this element
 599                 if ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
 600                         XML::addElement($doc, $root, "dfrn:community", 1);
 601                 }
 602
 603                 // The former element is replaced by this one
 604                 XML::addElement($doc, $root, "dfrn:account_type", $owner["account-type"]);
 605
 606                 /// @todo We need a way to transmit the different page flags like "User::PAGE_FLAGS_PRVGROUP"
 607
 608                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 609
 610                 $author = self::addAuthor($doc, $owner, $authorelement, $public);
 611                 $root->appendChild($author);
 612
 613                 return $root;
 614         }
 615
 616         /**
 617          * @brief Adds the author element in the header for the DFRN protocol
 618          *
 619          * @param DOMDocument $doc           XML document
 620          * @param array       $owner         Owner record
 621          * @param string      $authorelement Element name for the author
 622          * @param boolean     $public        boolean
 623          *
 624          * @return \DOMElement XML author object
 625          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 626          * @todo  Find proper type-hints
 627          */
 628         private static function addAuthor(DOMDocument $doc, array $owner, $authorelement, $public)
 629         {
 630                 // Is the profile hidden or shouldn't be published in the net? Then add the "hide" element
 631                 $r = q(
 632                         "SELECT `id` FROM `profile` INNER JOIN `user` ON `user`.`uid` = `profile`.`uid`
 633                                 WHERE (`hidewall` OR NOT `net-publish`) AND `user`.`uid` = %d",
 634                         intval($owner['uid'])
 635                 );
 636                 if (DBA::isResult($r)) {
 637                         $hidewall = true;
 638                 } else {
 639                         $hidewall = false;
 640                 }
 641
 642                 $author = $doc->createElement($authorelement);
 643
 644                 $namdate = DateTimeFormat::utc($owner['name-date'].'+00:00', DateTimeFormat::ATOM);
 645                 $uridate = DateTimeFormat::utc($owner['uri-date'].'+00:00', DateTimeFormat::ATOM);
 646                 $picdate = DateTimeFormat::utc($owner['avatar-date'].'+00:00', DateTimeFormat::ATOM);
 647
 648                 $attributes = [];
 649
 650                 if (!$public || !$hidewall) {
 651                         $attributes = ["dfrn:updated" => $namdate];
 652                 }
 653
 654                 XML::addElement($doc, $author, "name", $owner["name"], $attributes);
 655                 XML::addElement($doc, $author, "uri", System::baseUrl().'/profile/'.$owner["nickname"], $attributes);
 656                 XML::addElement($doc, $author, "dfrn:handle", $owner["addr"], $attributes);
 657
 658                 $attributes = ["rel" => "photo", "type" => "image/jpeg",
 659                                         "media:width" => 300, "media:height" => 300, "href" => $owner['photo']];
 660
 661                 if (!$public || !$hidewall) {
 662                         $attributes["dfrn:updated"] = $picdate;
 663                 }
 664
 665                 XML::addElement($doc, $author, "link", "", $attributes);
 666
 667                 $attributes["rel"] = "avatar";
 668                 XML::addElement($doc, $author, "link", "", $attributes);
 669
 670                 if ($hidewall) {
 671                         XML::addElement($doc, $author, "dfrn:hide", "true");
 672                 }
 673
 674                 // The following fields will only be generated if the data isn't meant for a public feed
 675                 if ($public) {
 676                         return $author;
 677                 }
 678
 679                 $birthday = feed_birthday($owner['uid'], $owner['timezone']);
 680
 681                 if ($birthday) {
 682                         XML::addElement($doc, $author, "dfrn:birthday", $birthday);
 683                 }
 684
 685                 // Only show contact details when we are allowed to
 686                 $r = q(
 687                         "SELECT `profile`.`about`, `profile`.`name`, `profile`.`homepage`, `user`.`nickname`,
 688                                 `user`.`timezone`, `profile`.`locality`, `profile`.`region`, `profile`.`country-name`,
 689                                 `profile`.`pub_keywords`, `profile`.`xmpp`, `profile`.`dob`
 690                         FROM `profile`
 691                                 INNER JOIN `user` ON `user`.`uid` = `profile`.`uid`
 692                                 WHERE `profile`.`is-default` AND NOT `user`.`hidewall` AND `user`.`uid` = %d",
 693                         intval($owner['uid'])
 694                 );
 695                 if (DBA::isResult($r)) {
 696                         $profile = $r[0];
 697
 698                         XML::addElement($doc, $author, "poco:displayName", $profile["name"]);
 699                         XML::addElement($doc, $author, "poco:updated", $namdate);
 700
 701                         if (trim($profile["dob"]) > DBA::NULL_DATE) {
 702                                 XML::addElement($doc, $author, "poco:birthday", "0000-".date("m-d", strtotime($profile["dob"])));
 703                         }
 704
 705                         XML::addElement($doc, $author, "poco:note", $profile["about"]);
 706                         XML::addElement($doc, $author, "poco:preferredUsername", $profile["nickname"]);
 707
 708                         $savetz = date_default_timezone_get();
 709                         date_default_timezone_set($profile["timezone"]);
 710                         XML::addElement($doc, $author, "poco:utcOffset", date("P"));
 711                         date_default_timezone_set($savetz);
 712
 713                         if (trim($profile["homepage"]) != "") {
 714                                 $urls = $doc->createElement("poco:urls");
 715                                 XML::addElement($doc, $urls, "poco:type", "homepage");
 716                                 XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
 717                                 XML::addElement($doc, $urls, "poco:primary", "true");
 718                                 $author->appendChild($urls);
 719                         }
 720
 721                         if (trim($profile["pub_keywords"]) != "") {
 722                                 $keywords = explode(",", $profile["pub_keywords"]);
 723
 724                                 foreach ($keywords as $keyword) {
 725                                         XML::addElement($doc, $author, "poco:tags", trim($keyword));
 726                                 }
 727                         }
 728
 729                         if (trim($profile["xmpp"]) != "") {
 730                                 $ims = $doc->createElement("poco:ims");
 731                                 XML::addElement($doc, $ims, "poco:type", "xmpp");
 732                                 XML::addElement($doc, $ims, "poco:value", $profile["xmpp"]);
 733                                 XML::addElement($doc, $ims, "poco:primary", "true");
 734                                 $author->appendChild($ims);
 735                         }
 736
 737                         if (trim($profile["locality"].$profile["region"].$profile["country-name"]) != "") {
 738                                 $element = $doc->createElement("poco:address");
 739
 740                                 XML::addElement($doc, $element, "poco:formatted", Profile::formatLocation($profile));
 741
 742                                 if (trim($profile["locality"]) != "") {
 743                                         XML::addElement($doc, $element, "poco:locality", $profile["locality"]);
 744                                 }
 745
 746                                 if (trim($profile["region"]) != "") {
 747                                         XML::addElement($doc, $element, "poco:region", $profile["region"]);
 748                                 }
 749
 750                                 if (trim($profile["country-name"]) != "") {
 751                                         XML::addElement($doc, $element, "poco:country", $profile["country-name"]);
 752                                 }
 753
 754                                 $author->appendChild($element);
 755                         }
 756                 }
 757
 758                 return $author;
 759         }
 760
 761         /**
 762          * @brief Adds the author elements in the "entry" elements of the DFRN protocol
 763          *
 764          * @param DOMDocument $doc         XML document
 765          * @param string $element     Element name for the author
 766          * @param string $contact_url Link of the contact
 767          * @param array  $item        Item elements
 768          *
 769          * @return \DOMElement XML author object
 770          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 771          * @todo  Find proper type-hints
 772          */
 773         private static function addEntryAuthor(DOMDocument $doc, $element, $contact_url, $item)
 774         {
 775                 $author = $doc->createElement($element);
 776
 777                 $contact = Contact::getDetailsByURL($contact_url, $item["uid"]);
 778                 if (!empty($contact)) {
 779                         XML::addElement($doc, $author, "name", $contact["name"]);
 780                         XML::addElement($doc, $author, "uri", $contact["url"]);
 781                         XML::addElement($doc, $author, "dfrn:handle", $contact["addr"]);
 782
 783                         /// @Todo
 784                         /// - Check real image type and image size
 785                         /// - Check which of these boths elements we should use
 786                         $attributes = [
 787                                 "rel" => "photo",
 788                                 "type" => "image/jpeg",
 789                                 "media:width" => 80,
 790                                 "media:height" => 80,
 791                                 "href" => $contact["photo"]];
 792                         XML::addElement($doc, $author, "link", "", $attributes);
 793
 794                         $attributes = [
 795                                 "rel" => "avatar",
 796                                 "type" => "image/jpeg",
 797                                 "media:width" => 80,
 798                                 "media:height" => 80,
 799                                 "href" => $contact["photo"]];
 800                         XML::addElement($doc, $author, "link", "", $attributes);
 801                 }
 802
 803                 return $author;
 804         }
 805
 806         /**
 807          * @brief Adds the activity elements
 808          *
 809          * @param DOMDocument $doc      XML document
 810          * @param string      $element  Element name for the activity
 811          * @param string      $activity activity value
 812          *
 813          * @return \DOMElement XML activity object
 814          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 815          * @todo  Find proper type-hints
 816          */
 817         private static function createActivity(DOMDocument $doc, $element, $activity)
 818         {
 819                 if ($activity) {
 820                         $entry = $doc->createElement($element);
 821
 822                         $r = XML::parseString($activity, false);
 823                         if (!$r) {
 824                                 return false;
 825                         }
 826
 827                         if ($r->type) {
 828                                 XML::addElement($doc, $entry, "activity:object-type", $r->type);
 829                         }
 830
 831                         if ($r->id) {
 832                                 XML::addElement($doc, $entry, "id", $r->id);
 833                         }
 834
 835                         if ($r->title) {
 836                                 XML::addElement($doc, $entry, "title", $r->title);
 837                         }
 838
 839                         if ($r->link) {
 840                                 if (substr($r->link, 0, 1) == '<') {
 841                                         if (strstr($r->link, '&') && (! strstr($r->link, '&amp;'))) {
 842                                                 $r->link = str_replace('&', '&amp;', $r->link);
 843                                         }
 844
 845                                         $r->link = preg_replace('/\<link(.*?)\"\>/', '<link$1"/>', $r->link);
 846
 847                                         // XML does need a single element as root element so we add a dummy element here
 848                                         $data = XML::parseString("<dummy>" . $r->link . "</dummy>", false);
 849                                         if (is_object($data)) {
 850                                                 foreach ($data->link as $link) {
 851                                                         $attributes = [];
 852                                                         foreach ($link->attributes() as $parameter => $value) {
 853                                                                 $attributes[$parameter] = $value;
 854                                                         }
 855                                                         XML::addElement($doc, $entry, "link", "", $attributes);
 856                                                 }
 857                                         }
 858                                 } else {
 859                                         $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $r->link];
 860                                         XML::addElement($doc, $entry, "link", "", $attributes);
 861                                 }
 862                         }
 863                         if ($r->content) {
 864                                 XML::addElement($doc, $entry, "content", BBCode::convert($r->content), ["type" => "html"]);
 865                         }
 866
 867                         return $entry;
 868                 }
 869
 870                 return false;
 871         }
 872
 873         /**
 874          * @brief Adds the elements for attachments
 875          *
 876          * @param object $doc  XML document
 877          * @param object $root XML root
 878          * @param array  $item Item element
 879          *
 880          * @return void XML attachment object
 881          * @todo  Find proper type-hints
 882          */
 883         private static function getAttachment($doc, $root, $item)
 884         {
 885                 $arr = explode('[/attach],', $item['attach']);
 886                 if (count($arr)) {
 887                         foreach ($arr as $r) {
 888                                 $matches = false;
 889                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 890                                 if ($cnt) {
 891                                         $attributes = ["rel" => "enclosure",
 892                                                         "href" => $matches[1],
 893                                                         "type" => $matches[3]];
 894
 895                                         if (intval($matches[2])) {
 896                                                 $attributes["length"] = intval($matches[2]);
 897                                         }
 898
 899                                         if (trim($matches[4]) != "") {
 900                                                 $attributes["title"] = trim($matches[4]);
 901                                         }
 902
 903                                         XML::addElement($doc, $root, "link", "", $attributes);
 904                                 }
 905                         }
 906                 }
 907         }
 908
 909         /**
 910          * @brief Adds the "entry" elements for the DFRN protocol
 911          *
 912          * @param DOMDocument $doc     XML document
 913          * @param string      $type    "text" or "html"
 914          * @param array       $item    Item element
 915          * @param array       $owner   Owner record
 916          * @param bool        $comment Trigger the sending of the "comment" element
 917          * @param int         $cid     Contact ID of the recipient
 918          * @param bool        $single  If set, the entry is created as an XML document with a single "entry" element
 919          *
 920          * @return null|\DOMElement XML entry object
 921          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 922          * @throws \ImagickException
 923          * @todo  Find proper type-hints
 924          */
 925         private static function entry(DOMDocument $doc, $type, array $item, array $owner, $comment = false, $cid = 0, $single = false)
 926         {
 927                 $mentioned = [];
 928
 929                 if (!$item['parent']) {
 930                         Logger::notice('Item without parent found.', ['type' => $type, 'item' => $item]);
 931                         return null;
 932                 }
 933
 934                 if ($item['deleted']) {
 935                         $attributes = ["ref" => $item['uri'], "when" => DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM)];
 936                         return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 937                 }
 938
 939                 if (!$single) {
 940                         $entry = $doc->createElement("entry");
 941                 } else {
 942                         $entry = $doc->createElementNS(NAMESPACE_ATOM1, 'entry');
 943                         $doc->appendChild($entry);
 944
 945                         $entry->setAttribute("xmlns:thr", NAMESPACE_THREAD);
 946                         $entry->setAttribute("xmlns:at", NAMESPACE_TOMB);
 947                         $entry->setAttribute("xmlns:media", NAMESPACE_MEDIA);
 948                         $entry->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
 949                         $entry->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
 950                         $entry->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
 951                         $entry->setAttribute("xmlns:poco", NAMESPACE_POCO);
 952                         $entry->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
 953                         $entry->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
 954                 }
 955
 956                 if ($item['private']) {
 957                         $body = Item::fixPrivatePhotos($item['body'], $owner['uid'], $item, $cid);
 958                 } else {
 959                         $body = $item['body'];
 960                 }
 961
 962                 // Remove the abstract element. It is only locally important.
 963                 $body = BBCode::stripAbstract($body);
 964
 965                 $htmlbody = '';
 966                 if ($type == 'html') {
 967                         $htmlbody = $body;
 968
 969                         if ($item['title'] != "") {
 970                                 $htmlbody = "[b]" . $item['title'] . "[/b]\n\n" . $htmlbody;
 971                         }
 972
 973                         $htmlbody = BBCode::convert($htmlbody, false, 7);
 974                 }
 975
 976                 $author = self::addEntryAuthor($doc, "author", $item["author-link"], $item);
 977                 $entry->appendChild($author);
 978
 979                 $dfrnowner = self::addEntryAuthor($doc, "dfrn:owner", $item["owner-link"], $item);
 980                 $entry->appendChild($dfrnowner);
 981
 982                 if (($item['parent'] != $item['id']) || ($item['parent-uri'] !== $item['uri']) || (($item['thr-parent'] !== '') && ($item['thr-parent'] !== $item['uri']))) {
 983                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 984                         $parent = Item::selectFirst(['guid', 'plink'], ['uri' => $parent_item, 'uid' => $item['uid']]);
 985                         $attributes = ["ref" => $parent_item, "type" => "text/html",
 986                                                 "href" => $parent['plink'],
 987                                                 "dfrn:diaspora_guid" => $parent['guid']];
 988                         XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 989                 }
 990
 991                 // Add conversation data. This is used for OStatus
 992                 $conversation_href = System::baseUrl()."/display/".$item["parent-guid"];
 993                 $conversation_uri = $conversation_href;
 994
 995                 if (isset($parent_item)) {
 996                         $conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $item['parent-uri']]);
 997                         if (DBA::isResult($conversation)) {
 998                                 if ($conversation['conversation-uri'] != '') {
 999                                         $conversation_uri = $conversation['conversation-uri'];
1000                                 }
1001                                 if ($conversation['conversation-href'] != '') {
1002                                         $conversation_href = $conversation['conversation-href'];
1003                                 }
1004                         }
1005                 }
1006
1007                 $attributes = [
1008                                 "href" => $conversation_href,
1009                                 "ref" => $conversation_uri];
1010
1011                 XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
1012
1013                 XML::addElement($doc, $entry, "id", $item["uri"]);
1014                 XML::addElement($doc, $entry, "title", $item["title"]);
1015
1016                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"] . "+00:00", DateTimeFormat::ATOM));
1017                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"] . "+00:00", DateTimeFormat::ATOM));
1018
1019                 // "dfrn:env" is used to read the content
1020                 XML::addElement($doc, $entry, "dfrn:env", Strings::base64UrlEncode($body, true));
1021
1022                 // The "content" field is not read by the receiver. We could remove it when the type is "text"
1023                 // We keep it at the moment, maybe there is some old version that doesn't read "dfrn:env"
1024                 XML::addElement($doc, $entry, "content", (($type == 'html') ? $htmlbody : $body), ["type" => $type]);
1025
1026                 // We save this value in "plink". Maybe we should read it from there as well?
1027                 XML::addElement(
1028                         $doc,
1029                         $entry,
1030                         "link",
1031                         "",
1032                         ["rel" => "alternate", "type" => "text/html",
1033                                  "href" => System::baseUrl() . "/display/" . $item["guid"]]
1034                 );
1035
1036                 // "comment-allow" is some old fashioned stuff for old Friendica versions.
1037                 // It is included in the rewritten code for completeness
1038                 if ($comment) {
1039                         XML::addElement($doc, $entry, "dfrn:comment-allow", 1);
1040                 }
1041
1042                 if ($item['location']) {
1043                         XML::addElement($doc, $entry, "dfrn:location", $item['location']);
1044                 }
1045
1046                 if ($item['coord']) {
1047                         XML::addElement($doc, $entry, "georss:point", $item['coord']);
1048                 }
1049
1050                 if ($item['private']) {
1051                         XML::addElement($doc, $entry, "dfrn:private", ($item['private'] ? $item['private'] : 1));
1052                 }
1053
1054                 if ($item['extid']) {
1055                         XML::addElement($doc, $entry, "dfrn:extid", $item['extid']);
1056                 }
1057
1058                 if ($item['post-type'] == Item::PT_PAGE) {
1059                         XML::addElement($doc, $entry, "dfrn:bookmark", "true");
1060                 }
1061
1062                 if ($item['app']) {
1063                         XML::addElement($doc, $entry, "statusnet:notice_info", "", ["local_id" => $item['id'], "source" => $item['app']]);
1064                 }
1065
1066                 XML::addElement($doc, $entry, "dfrn:diaspora_guid", $item["guid"]);
1067
1068                 // The signed text contains the content in Markdown, the sender handle and the signatur for the content
1069                 // It is needed for relayed comments to Diaspora.
1070                 if ($item['signed_text']) {
1071                         $sign = base64_encode(json_encode(['signed_text' => $item['signed_text'],'signature' => $item['signature'],'signer' => $item['signer']]));
1072                         XML::addElement($doc, $entry, "dfrn:diaspora_signature", $sign);
1073                 }
1074
1075                 XML::addElement($doc, $entry, "activity:verb", self::constructVerb($item));
1076
1077                 if ($item['object-type'] != "") {
1078                         XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
1079                 } elseif ($item['id'] == $item['parent']) {
1080                         XML::addElement($doc, $entry, "activity:object-type", ACTIVITY_OBJ_NOTE);
1081                 } else {
1082                         XML::addElement($doc, $entry, "activity:object-type", ACTIVITY_OBJ_COMMENT);
1083                 }
1084
1085                 $actobj = self::createActivity($doc, "activity:object", $item['object']);
1086                 if ($actobj) {
1087                         $entry->appendChild($actobj);
1088                 }
1089
1090                 $actarg = self::createActivity($doc, "activity:target", $item['target']);
1091                 if ($actarg) {
1092                         $entry->appendChild($actarg);
1093                 }
1094
1095                 $tags = Item::getFeedTags($item);
1096
1097                 /// @TODO Combine this with similar below if() block?
1098                 if (count($tags)) {
1099                         foreach ($tags as $t) {
1100                                 if (($type != 'html') || ($t[0] != "@")) {
1101                                         XML::addElement($doc, $entry, "category", "", ["scheme" => "X-DFRN:".$t[0].":".$t[1], "term" => $t[2]]);
1102                                 }
1103                         }
1104                 }
1105
1106                 if (count($tags)) {
1107                         foreach ($tags as $t) {
1108                                 if ($t[0] == "@") {
1109                                         $mentioned[$t[1]] = $t[1];
1110                                 }
1111                         }
1112                 }
1113
1114                 foreach ($mentioned as $mention) {
1115                         $condition = ['uid' => $owner["uid"], 'nurl' => Strings::normaliseLink($mention)];
1116                         $contact = DBA::selectFirst('contact', ['forum', 'prv'], $condition);
1117
1118                         if (DBA::isResult($contact) && ($contact["forum"] || $contact["prv"])) {
1119                                 XML::addElement(
1120                                         $doc,
1121                                         $entry,
1122                                         "link",
1123                                         "",
1124                                         ["rel" => "mentioned",
1125                                                         "ostatus:object-type" => ACTIVITY_OBJ_GROUP,
1126                                                         "href" => $mention]
1127                                 );
1128                         } else {
1129                                 XML::addElement(
1130                                         $doc,
1131                                         $entry,
1132                                         "link",
1133                                         "",
1134                                         ["rel" => "mentioned",
1135                                                         "ostatus:object-type" => ACTIVITY_OBJ_PERSON,
1136                                                         "href" => $mention]
1137                                 );
1138                         }
1139                 }
1140
1141                 self::getAttachment($doc, $entry, $item);
1142
1143                 return $entry;
1144         }
1145
1146         /**
1147          * @brief encrypts data via AES
1148          *
1149          * @param string $data The data that is to be encrypted
1150          * @param string $key  The AES key
1151          *
1152          * @return string encrypted data
1153          */
1154         private static function aesEncrypt($data, $key)
1155         {
1156                 return openssl_encrypt($data, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1157         }
1158
1159         /**
1160          * @brief decrypts data via AES
1161          *
1162          * @param string $encrypted The encrypted data
1163          * @param string $key       The AES key
1164          *
1165          * @return string decrypted data
1166          */
1167         public static function aesDecrypt($encrypted, $key)
1168         {
1169                 return openssl_decrypt($encrypted, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1170         }
1171
1172         /**
1173          * @brief Delivers the atom content to the contacts
1174          *
1175          * @param array  $owner    Owner record
1176          * @param array  $contact  Contact record of the receiver
1177          * @param string $atom     Content that will be transmitted
1178          * @param bool   $dissolve (to be documented)
1179          *
1180          * @return int Deliver status. Negative values mean an error.
1181          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1182          * @throws \ImagickException
1183          * @todo  Add array type-hint for $owner, $contact
1184          */
1185         public static function deliver($owner, $contact, $atom, $dissolve = false)
1186         {
1187                 $idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);
1188
1189                 if ($contact['duplex'] && $contact['dfrn-id']) {
1190                         $idtosend = '0:' . $orig_id;
1191                 }
1192                 if ($contact['duplex'] && $contact['issued-id']) {
1193                         $idtosend = '1:' . $orig_id;
1194                 }
1195
1196                 $rino = Config::get('system', 'rino_encrypt');
1197                 $rino = intval($rino);
1198
1199                 Logger::log("Local rino version: ". $rino, Logger::DEBUG);
1200
1201                 $ssl_val = intval(Config::get('system', 'ssl_policy'));
1202
1203                 switch ($ssl_val) {
1204                         case BaseURL::SSL_POLICY_FULL:
1205                                 $ssl_policy = 'full';
1206                                 break;
1207                         case BaseURL::SSL_POLICY_SELFSIGN:
1208                                 $ssl_policy = 'self';
1209                                 break;
1210                         case BaseURL::SSL_POLICY_NONE:
1211                         default:
1212                                 $ssl_policy = 'none';
1213                                 break;
1214                 }
1215
1216                 $url = $contact['notify'] . '&dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino='.$rino : '');
1217
1218                 Logger::log('dfrn_deliver: ' . $url);
1219
1220                 $curlResult = Network::curl($url);
1221
1222                 if ($curlResult->isTimeout()) {
1223                         return -2; // timed out
1224                 }
1225
1226                 $xml = $curlResult->getBody();
1227
1228                 $curl_stat = $curlResult->getReturnCode();
1229                 if (empty($curl_stat)) {
1230                         return -3; // timed out
1231                 }
1232
1233                 Logger::log('dfrn_deliver: ' . $xml, Logger::DATA);
1234
1235                 if (empty($xml)) {
1236                         return 3;
1237                 }
1238
1239                 if (strpos($xml, '<?xml') === false) {
1240                         Logger::log('dfrn_deliver: no valid XML returned');
1241                         Logger::log('dfrn_deliver: returned XML: ' . $xml, Logger::DATA);
1242                         return 3;
1243                 }
1244
1245                 $res = XML::parseString($xml);
1246
1247                 if (!is_object($res) || (intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
1248                         if (empty($res->status)) {
1249                                 $status = 3;
1250                         } else {
1251                                 $status = $res->status;
1252                         }
1253
1254                         return $status;
1255                 }
1256
1257                 $postvars     = [];
1258                 $sent_dfrn_id = hex2bin((string) $res->dfrn_id);
1259                 $challenge    = hex2bin((string) $res->challenge);
1260                 $perm         = (($res->perm) ? $res->perm : null);
1261                 $dfrn_version = (float) (($res->dfrn_version) ? $res->dfrn_version : 2.0);
1262                 $rino_remote_version = intval($res->rino);
1263                 $page         = (($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? 1 : 0);
1264
1265                 Logger::log("Remote rino version: ".$rino_remote_version." for ".$contact["url"], Logger::DEBUG);
1266
1267                 if ($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
1268                         $page = 2;
1269                 }
1270
1271                 $final_dfrn_id = '';
1272
1273                 if ($perm) {
1274                         if ((($perm == 'rw') && !intval($contact['writable']))
1275                                 || (($perm == 'r') && intval($contact['writable']))
1276                         ) {
1277                                 DBA::update('contact', ['writable' => ($perm == 'rw')], ['id' => $contact['id']]);
1278
1279                                 $contact['writable'] = (string) 1 - intval($contact['writable']);
1280                         }
1281                 }
1282
1283                 if (($contact['duplex'] && strlen($contact['pubkey']))
1284                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1285                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1286                 ) {
1287                         openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
1288                         openssl_public_decrypt($challenge, $postvars['challenge'], $contact['pubkey']);
1289                 } else {
1290                         openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
1291                         openssl_private_decrypt($challenge, $postvars['challenge'], $contact['prvkey']);
1292                 }
1293
1294                 $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
1295
1296                 if (strpos($final_dfrn_id, ':') == 1) {
1297                         $final_dfrn_id = substr($final_dfrn_id, 2);
1298                 }
1299
1300                 if ($final_dfrn_id != $orig_id) {
1301                         Logger::log('dfrn_deliver: wrong dfrn_id.');
1302                         // did not decode properly - cannot trust this site
1303                         return 3;
1304                 }
1305
1306                 $postvars['dfrn_id']      = $idtosend;
1307                 $postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
1308                 if ($dissolve) {
1309                         $postvars['dissolve'] = '1';
1310                 }
1311
1312                 if ((($contact['rel']) && ($contact['rel'] != Contact::SHARING) && (! $contact['blocked'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1313                         $postvars['data'] = $atom;
1314                         $postvars['perm'] = 'rw';
1315                 } else {
1316                         $postvars['data'] = str_replace('<dfrn:comment-allow>1', '<dfrn:comment-allow>0', $atom);
1317                         $postvars['perm'] = 'r';
1318                 }
1319
1320                 $postvars['ssl_policy'] = $ssl_policy;
1321
1322                 if ($page) {
1323                         $postvars['page'] = $page;
1324                 }
1325
1326
1327                 if ($rino > 0 && $rino_remote_version > 0 && (! $dissolve)) {
1328                         Logger::log('rino version: '. $rino_remote_version);
1329
1330                         switch ($rino_remote_version) {
1331                                 case 1:
1332                                         $key = openssl_random_pseudo_bytes(16);
1333                                         $data = self::aesEncrypt($postvars['data'], $key);
1334                                         break;
1335
1336                                 default:
1337                                         Logger::log("rino: invalid requested version '$rino_remote_version'");
1338                                         return -8;
1339                         }
1340
1341                         $postvars['rino'] = $rino_remote_version;
1342                         $postvars['data'] = bin2hex($data);
1343
1344                         if ($dfrn_version >= 2.1) {
1345                                 if (($contact['duplex'] && strlen($contact['pubkey']))
1346                                         || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY && strlen($contact['pubkey']))
1347                                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1348                                 ) {
1349                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1350                                 } else {
1351                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1352                                 }
1353                         } else {
1354                                 if (($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
1355                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1356                                 } else {
1357                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1358                                 }
1359                         }
1360
1361                         Logger::log('md5 rawkey ' . md5($postvars['key']));
1362
1363                         $postvars['key'] = bin2hex($postvars['key']);
1364                 }
1365
1366
1367                 Logger::log('dfrn_deliver: ' . "SENDING: " . print_r($postvars, true), Logger::DATA);
1368
1369                 $postResult = Network::post($contact['notify'], $postvars);
1370
1371                 $xml = $postResult->getBody();
1372
1373                 Logger::log('dfrn_deliver: ' . "RECEIVED: " . $xml, Logger::DATA);
1374
1375                 $curl_stat = $postResult->getReturnCode();
1376                 if (empty($curl_stat) || empty($xml)) {
1377                         return -9; // timed out
1378                 }
1379
1380                 if (($curl_stat == 503) && stristr($postResult->getHeader(), 'retry-after')) {
1381                         return -10;
1382                 }
1383
1384                 if (strpos($xml, '<?xml') === false) {
1385                         Logger::log('dfrn_deliver: phase 2: no valid XML returned');
1386                         Logger::log('dfrn_deliver: phase 2: returned XML: ' . $xml, Logger::DATA);
1387                         return 3;
1388                 }
1389
1390                 $res = XML::parseString($xml);
1391
1392                 if (!isset($res->status)) {
1393                         return -11;
1394                 }
1395
1396                 // Possibly old servers had returned an empty value when everything was okay
1397                 if (empty($res->status)) {
1398                         $res->status = 200;
1399                 }
1400
1401                 if (!empty($res->message)) {
1402                         Logger::log('Delivery returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1403                 }
1404
1405                 return intval($res->status);
1406         }
1407
1408         /**
1409          * @brief Transmits atom content to the contacts via the Diaspora transport layer
1410          *
1411          * @param array  $owner   Owner record
1412          * @param array  $contact Contact record of the receiver
1413          * @param string $atom    Content that will be transmitted
1414          *
1415          * @param bool   $public_batch
1416          * @return int Deliver status. Negative values mean an error.
1417          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1418          * @throws \ImagickException
1419          */
1420         public static function transmit($owner, $contact, $atom, $public_batch = false)
1421         {
1422                 if (!$public_batch) {
1423                         if (empty($contact['addr'])) {
1424                                 Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
1425                                 if (Contact::updateFromProbe($contact['id'])) {
1426                                         $new_contact = DBA::selectFirst('contact', ['addr'], ['id' => $contact['id']]);
1427                                         $contact['addr'] = $new_contact['addr'];
1428                                 }
1429
1430                                 if (empty($contact['addr'])) {
1431                                         Logger::log('Unable to find contact handle for ' . $contact['id'] . ' - ' . $contact['url']);
1432                                         return -21;
1433                                 }
1434                         }
1435
1436                         $fcontact = Diaspora::personByHandle($contact['addr']);
1437                         if (empty($fcontact)) {
1438                                 Logger::log('Unable to find contact details for ' . $contact['id'] . ' - ' . $contact['addr']);
1439                                 return -22;
1440                         }
1441                         $pubkey = $fcontact['pubkey'];
1442                 } else {
1443                         $pubkey = '';
1444                 }
1445
1446                 $envelope = Diaspora::buildMessage($atom, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
1447
1448                 // Create the endpoint for public posts. This is some WIP and should later be added to the probing
1449                 if ($public_batch && empty($contact["batch"])) {
1450                         $parts = parse_url($contact["notify"]);
1451                         $path_parts = explode('/', $parts['path']);
1452                         array_pop($path_parts);
1453                         $parts['path'] =  implode('/', $path_parts);
1454                         $contact["batch"] = Network::unparseURL($parts);
1455                 }
1456
1457                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
1458
1459                 if (empty($dest_url)) {
1460                         Logger::info('Empty destination', ['public' => $public_batch, 'contact' => $contact]);
1461                         return -24;
1462                 }
1463
1464                 $content_type = ($public_batch ? "application/magic-envelope+xml" : "application/json");
1465
1466                 $postResult = Network::post($dest_url, $envelope, ["Content-Type: ".$content_type]);
1467                 $xml = $postResult->getBody();
1468
1469                 $curl_stat = $postResult->getReturnCode();
1470                 if (empty($curl_stat) || empty($xml)) {
1471                         Logger::log('Empty answer from ' . $contact['id'] . ' - ' . $dest_url);
1472                         return -9; // timed out
1473                 }
1474
1475                 if (($curl_stat == 503) && (stristr($postResult->getHeader(), 'retry-after'))) {
1476                         return -10;
1477                 }
1478
1479                 if (strpos($xml, '<?xml') === false) {
1480                         Logger::log('No valid XML returned from ' . $contact['id'] . ' - ' . $dest_url);
1481                         Logger::log('Returned XML: ' . $xml, Logger::DATA);
1482                         return 3;
1483                 }
1484
1485                 $res = XML::parseString($xml);
1486
1487                 if (empty($res->status)) {
1488                         return -23;
1489                 }
1490
1491                 if (!empty($res->message)) {
1492                         Logger::log('Transmit to ' . $dest_url . ' returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1493                 }
1494
1495                 return intval($res->status);
1496         }
1497
1498         /**
1499          * @brief Fetch the author data from head or entry items
1500          *
1501          * @param object $xpath     XPath object
1502          * @param object $context   In which context should the data be searched
1503          * @param array  $importer  Record of the importer user mixed with contact of the content
1504          * @param string $element   Element name from which the data is fetched
1505          * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
1506          * @param string $xml       optional, default empty
1507          *
1508          * @return array Relevant data of the author
1509          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1510          * @throws \ImagickException
1511          * @todo  Find good type-hints for all parameter
1512          */
1513         private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
1514         {
1515                 $author = [];
1516                 $author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
1517                 $author["link"] = XML::getFirstNodeValue($xpath, $element."/atom:uri/text()", $context);
1518
1519                 $fields = ['id', 'uid', 'url', 'network', 'avatar-date', 'avatar', 'name-date', 'uri-date', 'addr',
1520                         'name', 'nick', 'about', 'location', 'keywords', 'xmpp', 'bdyear', 'bd', 'hidden', 'contact-type'];
1521                 $condition = ["`uid` = ? AND `nurl` = ? AND `network` != ?",
1522                         $importer["importer_uid"], Strings::normaliseLink($author["link"]), Protocol::STATUSNET];
1523                 $contact_old = DBA::selectFirst('contact', $fields, $condition);
1524
1525                 if (DBA::isResult($contact_old)) {
1526                         $author["contact-id"] = $contact_old["id"];
1527                         $author["network"] = $contact_old["network"];
1528                 } else {
1529                         if (!$onlyfetch) {
1530                                 Logger::debug("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml);
1531                         }
1532
1533                         $author["contact-unknown"] = true;
1534                         $author["contact-id"] = $importer["id"];
1535                         $author["network"] = $importer["network"];
1536                         $onlyfetch = true;
1537                 }
1538
1539                 // Until now we aren't serving different sizes - but maybe later
1540                 $avatarlist = [];
1541                 /// @todo check if "avatar" or "photo" would be the best field in the specification
1542                 $avatars = $xpath->query($element . "/atom:link[@rel='avatar']", $context);
1543                 foreach ($avatars as $avatar) {
1544                         $href = "";
1545                         $width = 0;
1546                         foreach ($avatar->attributes as $attributes) {
1547                                 /// @TODO Rewrite these similar if() to one switch
1548                                 if ($attributes->name == "href") {
1549                                         $href = $attributes->textContent;
1550                                 }
1551                                 if ($attributes->name == "width") {
1552                                         $width = $attributes->textContent;
1553                                 }
1554                                 if ($attributes->name == "updated") {
1555                                         $author["avatar-date"] = $attributes->textContent;
1556                                 }
1557                         }
1558                         if (($width > 0) && ($href != "")) {
1559                                 $avatarlist[$width] = $href;
1560                         }
1561                 }
1562
1563                 if (count($avatarlist) > 0) {
1564                         krsort($avatarlist);
1565                         $author["avatar"] = current($avatarlist);
1566                 }
1567
1568                 if (empty($author['avatar']) && !empty($author['link'])) {
1569                         $cid = Contact::getIdForURL($author['link'], 0);
1570                         if (!empty($cid)) {
1571                                 $contact = DBA::selectFirst('contact', ['avatar'], ['id' => $cid]);
1572                                 if (DBA::isResult($contact)) {
1573                                         $author['avatar'] = $contact['avatar'];
1574                                 }
1575                         }
1576                 }
1577
1578                 if (empty($author['avatar'])) {
1579                         Logger::log('Empty author: ' . $xml);
1580                         $author['avatar'] = '';
1581                 }
1582
1583                 if (DBA::isResult($contact_old) && !$onlyfetch) {
1584                         Logger::log("Check if contact details for contact " . $contact_old["id"] . " (" . $contact_old["nick"] . ") have to be updated.", Logger::DEBUG);
1585
1586                         $poco = ["url" => $contact_old["url"]];
1587
1588                         // When was the last change to name or uri?
1589                         $name_element = $xpath->query($element . "/atom:name", $context)->item(0);
1590                         foreach ($name_element->attributes as $attributes) {
1591                                 if ($attributes->name == "updated") {
1592                                         $poco["name-date"] = $attributes->textContent;
1593                                 }
1594                         }
1595
1596                         $link_element = $xpath->query($element . "/atom:link", $context)->item(0);
1597                         foreach ($link_element->attributes as $attributes) {
1598                                 if ($attributes->name == "updated") {
1599                                         $poco["uri-date"] = $attributes->textContent;
1600                                 }
1601                         }
1602
1603                         // Update contact data
1604                         $value = XML::getFirstNodeValue($xpath, $element . "/dfrn:handle/text()", $context);
1605                         if ($value != "") {
1606                                 $poco["addr"] = $value;
1607                         }
1608
1609                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:displayName/text()", $context);
1610                         if ($value != "") {
1611                                 $poco["name"] = $value;
1612                         }
1613
1614                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:preferredUsername/text()", $context);
1615                         if ($value != "") {
1616                                 $poco["nick"] = $value;
1617                         }
1618
1619                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:note/text()", $context);
1620                         if ($value != "") {
1621                                 $poco["about"] = $value;
1622                         }
1623
1624                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:address/poco:formatted/text()", $context);
1625                         if ($value != "") {
1626                                 $poco["location"] = $value;
1627                         }
1628
1629                         /// @todo Only search for elements with "poco:type" = "xmpp"
1630                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:ims/poco:value/text()", $context);
1631                         if ($value != "") {
1632                                 $poco["xmpp"] = $value;
1633                         }
1634
1635                         /// @todo Add support for the following fields that we don't support by now in the contact table:
1636                         /// - poco:utcOffset
1637                         /// - poco:urls
1638                         /// - poco:locality
1639                         /// - poco:region
1640                         /// - poco:country
1641
1642                         // If the "hide" element is present then the profile isn't searchable.
1643                         $hide = intval(XML::getFirstNodeValue($xpath, $element . "/dfrn:hide/text()", $context) == "true");
1644
1645                         Logger::log("Hidden status for contact " . $contact_old["url"] . ": " . $hide, Logger::DEBUG);
1646
1647                         // If the contact isn't searchable then set the contact to "hidden".
1648                         // Problem: This can be manually overridden by the user.
1649                         if ($hide) {
1650                                 $contact_old["hidden"] = true;
1651                         }
1652
1653                         // Save the keywords into the contact table
1654                         $tags = [];
1655                         $tagelements = $xpath->evaluate($element . "/poco:tags/text()", $context);
1656                         foreach ($tagelements as $tag) {
1657                                 $tags[$tag->nodeValue] = $tag->nodeValue;
1658                         }
1659
1660                         if (count($tags)) {
1661                                 $poco["keywords"] = implode(", ", $tags);
1662                         }
1663
1664                         // "dfrn:birthday" contains the birthday converted to UTC
1665                         $birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1666
1667                         if (strtotime($birthday) > time()) {
1668                                 $bd_timestamp = strtotime($birthday);
1669
1670                                 $poco["bdyear"] = date("Y", $bd_timestamp);
1671                         }
1672
1673                         // "poco:birthday" is the birthday in the format "yyyy-mm-dd"
1674                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1675
1676                         if (!in_array($value, ["", "0000-00-00", DBA::NULL_DATE])) {
1677                                 $bdyear = date("Y");
1678                                 $value = str_replace(["0000", "0001"], $bdyear, $value);
1679
1680                                 if (strtotime($value) < time()) {
1681                                         $value = str_replace($bdyear, $bdyear + 1, $value);
1682                                 }
1683
1684                                 $poco["bd"] = $value;
1685                         }
1686
1687                         $contact = array_merge($contact_old, $poco);
1688
1689                         if ($contact_old["bdyear"] != $contact["bdyear"]) {
1690                                 Event::createBirthday($contact, $birthday);
1691                         }
1692
1693                         $fields = ['name' => $contact['name'], 'nick' => $contact['nick'], 'about' => $contact['about'],
1694                                 'location' => $contact['location'], 'addr' => $contact['addr'], 'keywords' => $contact['keywords'],
1695                                 'bdyear' => $contact['bdyear'], 'bd' => $contact['bd'], 'hidden' => $contact['hidden'],
1696                                 'xmpp' => $contact['xmpp'], 'name-date' => DateTimeFormat::utc($contact['name-date']),
1697                                 'unsearchable' => $contact['hidden'], 'uri-date' => DateTimeFormat::utc($contact['uri-date'])];
1698
1699                         DBA::update('contact', $fields, ['id' => $contact['id'], 'network' => $contact['network']], $contact_old);
1700
1701                         // Update the public contact. Don't set the "hidden" value, this is used differently for public contacts
1702                         unset($fields['hidden']);
1703                         $condition = ['uid' => 0, 'nurl' => Strings::normaliseLink($contact_old['url'])];
1704                         DBA::update('contact', $fields, $condition, true);
1705
1706                         Contact::updateAvatar($author['avatar'], $importer['importer_uid'], $contact['id']);
1707
1708                         $pcid = Contact::getIdForURL($contact_old['url']);
1709                         if (!empty($pcid)) {
1710                                 Contact::updateAvatar($author['avatar'], 0, $pcid);
1711                         }
1712
1713                         /*
1714                          * The generation is a sign for the reliability of the provided data.
1715                          * It is used in the socgraph.php to prevent that old contact data
1716                          * that was relayed over several servers can overwrite contact
1717                          * data that we received directly.
1718                          */
1719
1720                         $poco["generation"] = 2;
1721                         $poco["photo"] = $author["avatar"];
1722                         $poco["hide"] = $hide;
1723                         $poco["contact-type"] = $contact["contact-type"];
1724                         $gcid = GContact::update($poco);
1725
1726                         GContact::link($gcid, $importer["importer_uid"], $contact["id"]);
1727                 }
1728
1729                 return $author;
1730         }
1731
1732         /**
1733          * @brief Transforms activity objects into an XML string
1734          *
1735          * @param object $xpath    XPath object
1736          * @param object $activity Activity object
1737          * @param string $element  element name
1738          *
1739          * @return string XML string
1740          * @todo Find good type-hints for all parameter
1741          */
1742         private static function transformActivity($xpath, $activity, $element)
1743         {
1744                 if (!is_object($activity)) {
1745                         return "";
1746                 }
1747
1748                 $obj_doc = new DOMDocument("1.0", "utf-8");
1749                 $obj_doc->formatOutput = true;
1750
1751                 $obj_element = $obj_doc->createElementNS(NAMESPACE_ATOM1, $element);
1752
1753                 $activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
1754                 XML::addElement($obj_doc, $obj_element, "type", $activity_type);
1755
1756                 $id = $xpath->query("atom:id", $activity)->item(0);
1757                 if (is_object($id)) {
1758                         $obj_element->appendChild($obj_doc->importNode($id, true));
1759                 }
1760
1761                 $title = $xpath->query("atom:title", $activity)->item(0);
1762                 if (is_object($title)) {
1763                         $obj_element->appendChild($obj_doc->importNode($title, true));
1764                 }
1765
1766                 $links = $xpath->query("atom:link", $activity);
1767                 if (is_object($links)) {
1768                         foreach ($links as $link) {
1769                                 $obj_element->appendChild($obj_doc->importNode($link, true));
1770                         }
1771                 }
1772
1773                 $content = $xpath->query("atom:content", $activity)->item(0);
1774                 if (is_object($content)) {
1775                         $obj_element->appendChild($obj_doc->importNode($content, true));
1776                 }
1777
1778                 $obj_doc->appendChild($obj_element);
1779
1780                 $objxml = $obj_doc->saveXML($obj_element);
1781
1782                 /// @todo This isn't totally clean. We should find a way to transform the namespaces
1783                 $objxml = str_replace("<".$element.' xmlns="http://www.w3.org/2005/Atom">', "<".$element.">", $objxml);
1784                 return($objxml);
1785         }
1786
1787         /**
1788          * @brief Processes the mail elements
1789          *
1790          * @param object $xpath    XPath object
1791          * @param object $mail     mail elements
1792          * @param array  $importer Record of the importer user mixed with contact of the content
1793          * @return void
1794          * @throws \Exception
1795          * @todo  Find good type-hints for all parameter
1796          */
1797         private static function processMail($xpath, $mail, $importer)
1798         {
1799                 Logger::log("Processing mails");
1800
1801                 $msg = [];
1802                 $msg["uid"] = $importer["importer_uid"];
1803                 $msg["from-name"] = $xpath->query("dfrn:sender/dfrn:name/text()", $mail)->item(0)->nodeValue;
1804                 $msg["from-url"] = $xpath->query("dfrn:sender/dfrn:uri/text()", $mail)->item(0)->nodeValue;
1805                 $msg["from-photo"] = $xpath->query("dfrn:sender/dfrn:avatar/text()", $mail)->item(0)->nodeValue;
1806                 $msg["contact-id"] = $importer["id"];
1807                 $msg["uri"] = $xpath->query("dfrn:id/text()", $mail)->item(0)->nodeValue;
1808                 $msg["parent-uri"] = $xpath->query("dfrn:in-reply-to/text()", $mail)->item(0)->nodeValue;
1809                 $msg["created"] = DateTimeFormat::utc($xpath->query("dfrn:sentdate/text()", $mail)->item(0)->nodeValue);
1810                 $msg["title"] = $xpath->query("dfrn:subject/text()", $mail)->item(0)->nodeValue;
1811                 $msg["body"] = $xpath->query("dfrn:content/text()", $mail)->item(0)->nodeValue;
1812
1813                 Mail::insert($msg);
1814         }
1815
1816         /**
1817          * @brief Processes the suggestion elements
1818          *
1819          * @param object $xpath      XPath object
1820          * @param object $suggestion suggestion elements
1821          * @param array  $importer   Record of the importer user mixed with contact of the content
1822          * @return boolean
1823          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1824          * @todo  Find good type-hints for all parameter
1825          */
1826         private static function processSuggestion($xpath, $suggestion, $importer)
1827         {
1828                 Logger::log('Processing suggestions');
1829
1830                 /// @TODO Rewrite this to one statement
1831                 $suggest = [];
1832                 $suggest['uid'] = $importer['importer_uid'];
1833                 $suggest['cid'] = $importer['id'];
1834                 $suggest['url'] = $xpath->query('dfrn:url/text()', $suggestion)->item(0)->nodeValue;
1835                 $suggest['name'] = $xpath->query('dfrn:name/text()', $suggestion)->item(0)->nodeValue;
1836                 $suggest['photo'] = $xpath->query('dfrn:photo/text()', $suggestion)->item(0)->nodeValue;
1837                 $suggest['request'] = $xpath->query('dfrn:request/text()', $suggestion)->item(0)->nodeValue;
1838                 $suggest['body'] = $xpath->query('dfrn:note/text()', $suggestion)->item(0)->nodeValue;
1839
1840                 // Does our member already have a friend matching this description?
1841
1842                 /*
1843                  * The valid result means the friend we're about to send a friend
1844                  * suggestion already has them in their contact, which means no further
1845                  * action is required.
1846                  *
1847                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1848                  */
1849                 $condition = ['nurl' => Strings::normaliseLink($suggest['url']), 'uid' => $suggest['uid']];
1850                 if (DBA::exists('contact', $condition)) {
1851                         return false;
1852                 }
1853                 // Do we already have an fcontact record for this person?
1854
1855                 $fid = 0;
1856                 $fcontact = DBA::selectFirst('fcontact', ['id'], ['url' => $suggest['url']]);
1857                 if (DBA::isResult($fcontact)) {
1858                         $fid = $fcontact['id'];
1859
1860                         // OK, we do. Do we already have an introduction for this person?
1861                         if (DBA::exists('intro', ['uid' => $suggest['uid'], 'fid' => $fid])) {
1862                                 /*
1863                                  * The valid result means the friend we're about to send a friend
1864                                  * suggestion already has them in their contact, which means no further
1865                                  * action is required.
1866                                  *
1867                                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1868                                  */
1869                                 return false;
1870                         }
1871                 }
1872
1873                 if (!$fid) {
1874                         $fields = ['name' => $suggest['name'], 'url' => $suggest['url'],
1875                                 'photo' => $suggest['photo'], 'request' => $suggest['request']];
1876                         DBA::insert('fcontact', $fields);
1877                         $fid = DBA::lastInsertId();
1878                 }
1879
1880                 /*
1881                  * If no record in fcontact is found, below INSERT statement will not
1882                  * link an introduction to it.
1883                  */
1884                 if (empty($fid)) {
1885                         // Database record did not get created. Quietly give up.
1886                         exit();
1887                 }
1888
1889                 $hash = Strings::getRandomHex();
1890
1891                 $fields = ['uid' => $suggest['uid'], 'fid' => $fid, 'contact-id' => $suggest['cid'],
1892                         'note' => $suggest['body'], 'hash' => $hash, 'datetime' => DateTimeFormat::utcNow(), 'blocked' => false];
1893                 DBA::insert('intro', $fields);
1894
1895                 notification(
1896                         [
1897                                 'type'         => NOTIFY_SUGGEST,
1898                                 'notify_flags' => $importer['notify-flags'],
1899                                 'language'     => $importer['language'],
1900                                 'to_name'      => $importer['username'],
1901                                 'to_email'     => $importer['email'],
1902                                 'uid'          => $importer['importer_uid'],
1903                                 'item'         => $suggest,
1904                                 'link'         => System::baseUrl().'/notifications/intros',
1905                                 'source_name'  => $importer['name'],
1906                                 'source_link'  => $importer['url'],
1907                                 'source_photo' => $importer['photo'],
1908                                 'verb'         => ACTIVITY_REQ_FRIEND,
1909                                 'otype'        => 'intro']
1910                 );
1911
1912                 return true;
1913         }
1914
1915         /**
1916          * @brief Processes the relocation elements
1917          *
1918          * @param object $xpath      XPath object
1919          * @param object $relocation relocation elements
1920          * @param array  $importer   Record of the importer user mixed with contact of the content
1921          * @return boolean
1922          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1923          * @throws \ImagickException
1924          * @todo  Find good type-hints for all parameter
1925          */
1926         private static function processRelocation($xpath, $relocation, $importer)
1927         {
1928                 Logger::log("Processing relocations");
1929
1930                 /// @TODO Rewrite this to one statement
1931                 $relocate = [];
1932                 $relocate["uid"] = $importer["importer_uid"];
1933                 $relocate["cid"] = $importer["id"];
1934                 $relocate["url"] = $xpath->query("dfrn:url/text()", $relocation)->item(0)->nodeValue;
1935                 $relocate["addr"] = $xpath->query("dfrn:addr/text()", $relocation)->item(0)->nodeValue;
1936                 $relocate["name"] = $xpath->query("dfrn:name/text()", $relocation)->item(0)->nodeValue;
1937                 $relocate["avatar"] = $xpath->query("dfrn:avatar/text()", $relocation)->item(0)->nodeValue;
1938                 $relocate["photo"] = $xpath->query("dfrn:photo/text()", $relocation)->item(0)->nodeValue;
1939                 $relocate["thumb"] = $xpath->query("dfrn:thumb/text()", $relocation)->item(0)->nodeValue;
1940                 $relocate["micro"] = $xpath->query("dfrn:micro/text()", $relocation)->item(0)->nodeValue;
1941                 $relocate["request"] = $xpath->query("dfrn:request/text()", $relocation)->item(0)->nodeValue;
1942                 $relocate["confirm"] = $xpath->query("dfrn:confirm/text()", $relocation)->item(0)->nodeValue;
1943                 $relocate["notify"] = $xpath->query("dfrn:notify/text()", $relocation)->item(0)->nodeValue;
1944                 $relocate["poll"] = $xpath->query("dfrn:poll/text()", $relocation)->item(0)->nodeValue;
1945                 $relocate["sitepubkey"] = $xpath->query("dfrn:sitepubkey/text()", $relocation)->item(0)->nodeValue;
1946
1947                 if (($relocate["avatar"] == "") && ($relocate["photo"] != "")) {
1948                         $relocate["avatar"] = $relocate["photo"];
1949                 }
1950
1951                 if ($relocate["addr"] == "") {
1952                         $relocate["addr"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$3@$2", $relocate["url"]);
1953                 }
1954
1955                 // update contact
1956                 $r = q(
1957                         "SELECT `photo`, `url` FROM `contact` WHERE `id` = %d AND `uid` = %d",
1958                         intval($importer["id"]),
1959                         intval($importer["importer_uid"])
1960                 );
1961
1962                 if (!DBA::isResult($r)) {
1963                         Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
1964                         return false;
1965                 }
1966
1967                 $old = $r[0];
1968
1969                 // Update the gcontact entry
1970                 $relocate["server_url"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $relocate["url"]);
1971
1972                 $fields = ['name' => $relocate["name"], 'photo' => $relocate["avatar"],
1973                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1974                         'addr' => $relocate["addr"], 'connect' => $relocate["addr"],
1975                         'notify' => $relocate["notify"], 'server_url' => $relocate["server_url"]];
1976                 DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($old["url"])]);
1977
1978                 // Update the contact table. We try to find every entry.
1979                 $fields = ['name' => $relocate["name"], 'avatar' => $relocate["avatar"],
1980                         'url' => $relocate["url"], 'nurl' => Strings::normaliseLink($relocate["url"]),
1981                         'addr' => $relocate["addr"], 'request' => $relocate["request"],
1982                         'confirm' => $relocate["confirm"], 'notify' => $relocate["notify"],
1983                         'poll' => $relocate["poll"], 'site-pubkey' => $relocate["sitepubkey"]];
1984                 $condition = ["(`id` = ?) OR (`nurl` = ?)", $importer["id"], Strings::normaliseLink($old["url"])];
1985
1986                 DBA::update('contact', $fields, $condition);
1987
1988                 Contact::updateAvatar($relocate["avatar"], $importer["importer_uid"], $importer["id"], true);
1989
1990                 Logger::log('Contacts are updated.');
1991
1992                 /// @TODO
1993                 /// merge with current record, current contents have priority
1994                 /// update record, set url-updated
1995                 /// update profile photos
1996                 /// schedule a scan?
1997                 return true;
1998         }
1999
2000         /**
2001          * @brief Updates an item
2002          *
2003          * @param array $current   the current item record
2004          * @param array $item      the new item record
2005          * @param array $importer  Record of the importer user mixed with contact of the content
2006          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2007          * @return mixed
2008          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2009          * @todo  set proper type-hints (array?)
2010          */
2011         private static function updateContent($current, $item, $importer, $entrytype)
2012         {
2013                 $changed = false;
2014
2015                 if (self::isEditedTimestampNewer($current, $item)) {
2016                         // do not accept (ignore) an earlier edit than one we currently have.
2017                         if (DateTimeFormat::utc($item["edited"]) < $current["edited"]) {
2018                                 return false;
2019                         }
2020
2021                         $fields = ['title' => defaults($item, 'title', ''), 'body' => defaults($item, 'body', ''),
2022                                         'tag' => defaults($item, 'tag', ''), 'changed' => DateTimeFormat::utcNow(),
2023                                         'edited' => DateTimeFormat::utc($item["edited"])];
2024
2025                         $condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
2026                         Item::update($fields, $condition);
2027
2028                         $changed = true;
2029                 }
2030                 return $changed;
2031         }
2032
2033         /**
2034          * @brief Detects the entry type of the item
2035          *
2036          * @param array $importer Record of the importer user mixed with contact of the content
2037          * @param array $item     the new item record
2038          *
2039          * @return int Is it a toplevel entry, a comment or a relayed comment?
2040          * @throws \Exception
2041          * @todo  set proper type-hints (array?)
2042          */
2043         private static function getEntryType($importer, $item)
2044         {
2045                 if ($item["parent-uri"] != $item["uri"]) {
2046                         $community = false;
2047
2048                         if ($importer["page-flags"] == User::PAGE_FLAGS_COMMUNITY || $importer["page-flags"] == User::PAGE_FLAGS_PRVGROUP) {
2049                                 $sql_extra = "";
2050                                 $community = true;
2051                                 Logger::log("possible community action");
2052                         } else {
2053                                 $sql_extra = " AND `contact`.`self` AND `item`.`wall` ";
2054                         }
2055
2056                         // was the top-level post for this action written by somebody on this site?
2057                         // Specifically, the recipient?
2058
2059                         $is_a_remote_action = false;
2060
2061                         $parent = Item::selectFirst(['parent-uri'], ['uri' => $item["parent-uri"]]);
2062                         if (DBA::isResult($parent)) {
2063                                 $r = q(
2064                                         "SELECT `item`.`forum_mode`, `item`.`wall` FROM `item`
2065                                         INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2066                                         WHERE `item`.`uri` = '%s' AND (`item`.`parent-uri` = '%s' OR `item`.`thr-parent` = '%s')
2067                                         AND `item`.`uid` = %d
2068                                         $sql_extra
2069                                         LIMIT 1",
2070                                         DBA::escape($parent["parent-uri"]),
2071                                         DBA::escape($parent["parent-uri"]),
2072                                         DBA::escape($parent["parent-uri"]),
2073                                         intval($importer["importer_uid"])
2074                                 );
2075                                 if (DBA::isResult($r)) {
2076                                         $is_a_remote_action = true;
2077                                 }
2078                         }
2079
2080                         /*
2081                          * Does this have the characteristics of a community or private group action?
2082                          * If it's an action to a wall post on a community/prvgroup page it's a
2083                          * valid community action. Also forum_mode makes it valid for sure.
2084                          * If neither, it's not.
2085                          */
2086                         if ($is_a_remote_action && $community && (!$r[0]["forum_mode"]) && (!$r[0]["wall"])) {
2087                                 $is_a_remote_action = false;
2088                                 Logger::log("not a community action");
2089                         }
2090
2091                         if ($is_a_remote_action) {
2092                                 return DFRN::REPLY_RC;
2093                         } else {
2094                                 return DFRN::REPLY;
2095                         }
2096                 } else {
2097                         return DFRN::TOP_LEVEL;
2098                 }
2099         }
2100
2101         /**
2102          * @brief Send a "poke"
2103          *
2104          * @param array $item      The new item record
2105          * @param array $importer  Record of the importer user mixed with contact of the content
2106          * @return void
2107          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2108          * @todo  set proper type-hints (array?)
2109          */
2110         private static function doPoke(array $item, array $importer)
2111         {
2112                 $verb = urldecode(substr($item["verb"], strpos($item["verb"], "#")+1));
2113                 if (!$verb) {
2114                         return;
2115                 }
2116                 $xo = XML::parseString($item["object"], false);
2117
2118                 if (($xo->type == ACTIVITY_OBJ_PERSON) && ($xo->id)) {
2119                         // somebody was poked/prodded. Was it me?
2120                         $Blink = '';
2121                         foreach ($xo->link as $l) {
2122                                 $atts = $l->attributes();
2123                                 switch ($atts["rel"]) {
2124                                         case "alternate":
2125                                                 $Blink = $atts["href"];
2126                                                 break;
2127                                         default:
2128                                                 break;
2129                                 }
2130                         }
2131
2132                         if ($Blink && Strings::compareLink($Blink, System::baseUrl() . "/profile/" . $importer["nickname"])) {
2133                                 $author = DBA::selectFirst('contact', ['name', 'thumb', 'url'], ['id' => $item['author-id']]);
2134
2135                                 $parent = Item::selectFirst(['id'], ['uri' => $item['parent-uri'], 'uid' => $importer["importer_uid"]]);
2136                                 $item["parent"] = $parent['id'];
2137
2138                                 // send a notification
2139                                 notification(
2140                                         [
2141                                         "type"         => NOTIFY_POKE,
2142                                         "notify_flags" => $importer["notify-flags"],
2143                                         "language"     => $importer["language"],
2144                                         "to_name"      => $importer["username"],
2145                                         "to_email"     => $importer["email"],
2146                                         "uid"          => $importer["importer_uid"],
2147                                         "item"         => $item,
2148                                         "link"         => System::baseUrl()."/display/".urlencode($item['guid']),
2149                                         "source_name"  => $author["name"],
2150                                         "source_link"  => $author["url"],
2151                                         "source_photo" => $author["thumb"],
2152                                         "verb"         => $item["verb"],
2153                                         "otype"        => "person",
2154                                         "activity"     => $verb,
2155                                         "parent"       => $item["parent"]]
2156                                 );
2157                         }
2158                 }
2159         }
2160
2161         /**
2162          * @brief Processes several actions, depending on the verb
2163          *
2164          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2165          * @param array $importer  Record of the importer user mixed with contact of the content
2166          * @param array $item      the new item record
2167          * @param bool  $is_like   Is the verb a "like"?
2168          *
2169          * @return bool Should the processing of the entries be continued?
2170          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2171          * @todo  set proper type-hints (array?)
2172          */
2173         private static function processVerbs($entrytype, $importer, &$item, &$is_like)
2174         {
2175                 Logger::log("Process verb ".$item["verb"]." and object-type ".$item["object-type"]." for entrytype ".$entrytype, Logger::DEBUG);
2176
2177                 if (($entrytype == DFRN::TOP_LEVEL) && !empty($importer['id'])) {
2178                         // The filling of the the "contact" variable is done for legcy reasons
2179                         // The functions below are partly used by ostatus.php as well - where we have this variable
2180                         $contact = Contact::select([], ['id' => $importer['id']]);
2181
2182                         // Big question: Do we need these functions? They were part of the "consume_feed" function.
2183                         // This function once was responsible for DFRN and OStatus.
2184                         if (activity_match($item["verb"], ACTIVITY_FOLLOW)) {
2185                                 Logger::log("New follower");
2186                                 Contact::addRelationship($importer, $contact, $item);
2187                                 return false;
2188                         }
2189                         if (activity_match($item["verb"], ACTIVITY_UNFOLLOW)) {
2190                                 Logger::log("Lost follower");
2191                                 Contact::removeFollower($importer, $contact, $item);
2192                                 return false;
2193                         }
2194                         if (activity_match($item["verb"], ACTIVITY_REQ_FRIEND)) {
2195                                 Logger::log("New friend request");
2196                                 Contact::addRelationship($importer, $contact, $item, true);
2197                                 return false;
2198                         }
2199                         if (activity_match($item["verb"], ACTIVITY_UNFRIEND)) {
2200                                 Logger::log("Lost sharer");
2201                                 Contact::removeSharer($importer, $contact, $item);
2202                                 return false;
2203                         }
2204                 } else {
2205                         if (($item["verb"] == ACTIVITY_LIKE)
2206                                 || ($item["verb"] == ACTIVITY_DISLIKE)
2207                                 || ($item["verb"] == ACTIVITY_ATTEND)
2208                                 || ($item["verb"] == ACTIVITY_ATTENDNO)
2209                                 || ($item["verb"] == ACTIVITY_ATTENDMAYBE)
2210                         ) {
2211                                 $is_like = true;
2212                                 $item["gravity"] = GRAVITY_ACTIVITY;
2213                                 // only one like or dislike per person
2214                                 // splitted into two queries for performance issues
2215                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2216                                         'verb' => $item["verb"], 'parent-uri' => $item["parent-uri"]];
2217                                 if (Item::exists($condition)) {
2218                                         return false;
2219                                 }
2220
2221                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2222                                         'verb' => $item["verb"], 'thr-parent' => $item["parent-uri"]];
2223                                 if (Item::exists($condition)) {
2224                                         return false;
2225                                 }
2226
2227                                 // The owner of an activity must be the author
2228                                 $item["owner-name"] = $item["author-name"];
2229                                 $item["owner-link"] = $item["author-link"];
2230                                 $item["owner-avatar"] = $item["author-avatar"];
2231                                 $item["owner-id"] = $item["author-id"];
2232                         } else {
2233                                 $is_like = false;
2234                         }
2235
2236                         if (($item["verb"] == ACTIVITY_TAG) && ($item["object-type"] == ACTIVITY_OBJ_TAGTERM)) {
2237                                 $xo = XML::parseString($item["object"], false);
2238                                 $xt = XML::parseString($item["target"], false);
2239
2240                                 if ($xt->type == ACTIVITY_OBJ_NOTE) {
2241                                         $item_tag = Item::selectFirst(['id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
2242
2243                                         if (!DBA::isResult($item_tag)) {
2244                                                 Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2245                                                 return false;
2246                                         }
2247
2248                                         // extract tag, if not duplicate, add to parent item
2249                                         if ($xo->content) {
2250                                                 if (!stristr($item_tag["tag"], trim($xo->content))) {
2251                                                         $tag = $item_tag["tag"] . (strlen($item_tag["tag"]) ? ',' : '') . '#[url=' . $xo->id . ']'. $xo->content . '[/url]';
2252                                                         Item::update(['tag' => $tag], ['id' => $item_tag["id"]]);
2253                                                 }
2254                                         }
2255                                 }
2256                         }
2257                 }
2258                 return true;
2259         }
2260
2261         /**
2262          * @brief Processes the link elements
2263          *
2264          * @param object $links link elements
2265          * @param array  $item  the item record
2266          * @return void
2267          * @todo set proper type-hints
2268          */
2269         private static function parseLinks($links, &$item)
2270         {
2271                 $rel = "";
2272                 $href = "";
2273                 $type = "";
2274                 $length = "0";
2275                 $title = "";
2276                 foreach ($links as $link) {
2277                         foreach ($link->attributes as $attributes) {
2278                                 switch ($attributes->name) {
2279                                         case "href"  : $href   = $attributes->textContent; break;
2280                                         case "rel"   : $rel    = $attributes->textContent; break;
2281                                         case "type"  : $type   = $attributes->textContent; break;
2282                                         case "length": $length = $attributes->textContent; break;
2283                                         case "title" : $title  = $attributes->textContent; break;
2284                                 }
2285                         }
2286                         if (($rel != "") && ($href != "")) {
2287                                 switch ($rel) {
2288                                         case "alternate":
2289                                                 $item["plink"] = $href;
2290                                                 break;
2291                                         case "enclosure":
2292                                                 if (!empty($item["attach"])) {
2293                                                         $item["attach"] .= ",";
2294                                                 } else {
2295                                                         $item["attach"] = "";
2296                                                 }
2297
2298                                                 $item["attach"] .= '[attach]href="' . $href . '" length="' . $length . '" type="' . $type . '" title="' . $title . '"[/attach]';
2299                                                 break;
2300                                 }
2301                         }
2302                 }
2303         }
2304
2305         /**
2306          * @brief Processes the entry elements which contain the items and comments
2307          *
2308          * @param array  $header   Array of the header elements that always stay the same
2309          * @param object $xpath    XPath object
2310          * @param object $entry    entry elements
2311          * @param array  $importer Record of the importer user mixed with contact of the content
2312          * @param string $xml      xml
2313          * @return void
2314          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2315          * @throws \ImagickException
2316          * @todo  Add type-hints
2317          */
2318         private static function processEntry($header, $xpath, $entry, $importer, $xml)
2319         {
2320                 Logger::log("Processing entries");
2321
2322                 $item = $header;
2323
2324                 $item["protocol"] = Conversation::PARCEL_DFRN;
2325
2326                 $item["source"] = $xml;
2327
2328                 // Get the uri
2329                 $item["uri"] = XML::getFirstNodeValue($xpath, "atom:id/text()", $entry);
2330
2331                 $item["edited"] = XML::getFirstNodeValue($xpath, "atom:updated/text()", $entry);
2332
2333                 $current = Item::selectFirst(['id', 'uid', 'edited', 'body'],
2334                         ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]]
2335                 );
2336                 // Is there an existing item?
2337                 if (DBA::isResult($current) && !self::isEditedTimestampNewer($current, $item)) {
2338                         Logger::log("Item ".$item["uri"]." (".$item['edited'].") already existed.", Logger::DEBUG);
2339                         return;
2340                 }
2341
2342                 // Fetch the owner
2343                 $owner = self::fetchauthor($xpath, $entry, $importer, "dfrn:owner", true, $xml);
2344
2345                 $owner_unknown = (isset($owner["contact-unknown"]) && $owner["contact-unknown"]);
2346
2347                 $item["owner-name"] = $owner["name"];
2348                 $item["owner-link"] = $owner["link"];
2349                 $item["owner-avatar"] = $owner["avatar"];
2350                 $item["owner-id"] = Contact::getIdForURL($owner["link"], 0);
2351
2352                 // fetch the author
2353                 $author = self::fetchauthor($xpath, $entry, $importer, "atom:author", true, $xml);
2354
2355                 $item["author-name"] = $author["name"];
2356                 $item["author-link"] = $author["link"];
2357                 $item["author-avatar"] = $author["avatar"];
2358                 $item["author-id"] = Contact::getIdForURL($author["link"], 0);
2359
2360                 $item["title"] = XML::getFirstNodeValue($xpath, "atom:title/text()", $entry);
2361
2362                 $item["created"] = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2363
2364                 $item["body"] = XML::getFirstNodeValue($xpath, "dfrn:env/text()", $entry);
2365                 $item["body"] = str_replace([' ',"\t","\r","\n"], ['','','',''], $item["body"]);
2366                 // make sure nobody is trying to sneak some html tags by us
2367                 $item["body"] = Strings::escapeTags(Strings::base64UrlDecode($item["body"]));
2368
2369                 $item["body"] = BBCode::limitBodySize($item["body"]);
2370
2371                 /// @todo Do we really need this check for HTML elements? (It was copied from the old function)
2372                 if ((strpos($item['body'], '<') !== false) && (strpos($item['body'], '>') !== false)) {
2373                         $base_url = \get_app()->getBaseURL();
2374                         $item['body'] = HTML::relToAbs($item['body'], $base_url);
2375
2376                         $item['body'] = HTML::toBBCodeVideo($item['body']);
2377
2378                         $item['body'] = OEmbed::HTML2BBCode($item['body']);
2379
2380                         $config = HTMLPurifier_Config::createDefault();
2381                         $config->set('Cache.DefinitionImpl', null);
2382
2383                         // we shouldn't need a whitelist, because the bbcode converter
2384                         // will strip out any unsupported tags.
2385
2386                         $purifier = new HTMLPurifier($config);
2387                         $item['body'] = $purifier->purify($item['body']);
2388
2389                         $item['body'] = @HTML::toBBCode($item['body']);
2390                 }
2391
2392                 /// @todo We should check for a repeated post and if we know the repeated author.
2393
2394                 // We don't need the content element since "dfrn:env" is always present
2395                 //$item["body"] = $xpath->query("atom:content/text()", $entry)->item(0)->nodeValue;
2396
2397                 $item["location"] = XML::getFirstNodeValue($xpath, "dfrn:location/text()", $entry);
2398
2399                 $item["coord"] = XML::getFirstNodeValue($xpath, "georss:point", $entry);
2400
2401                 $item["private"] = XML::getFirstNodeValue($xpath, "dfrn:private/text()", $entry);
2402
2403                 $item["extid"] = XML::getFirstNodeValue($xpath, "dfrn:extid/text()", $entry);
2404
2405                 if (XML::getFirstNodeValue($xpath, "dfrn:bookmark/text()", $entry) == "true") {
2406                         $item["post-type"] = Item::PT_PAGE;
2407                 }
2408
2409                 $notice_info = $xpath->query("statusnet:notice_info", $entry);
2410                 if ($notice_info && ($notice_info->length > 0)) {
2411                         foreach ($notice_info->item(0)->attributes as $attributes) {
2412                                 if ($attributes->name == "source") {
2413                                         $item["app"] = strip_tags($attributes->textContent);
2414                                 }
2415                         }
2416                 }
2417
2418                 $item["guid"] = XML::getFirstNodeValue($xpath, "dfrn:diaspora_guid/text()", $entry);
2419
2420                 // We store the data from "dfrn:diaspora_signature" in a different table, this is done in "Item::insert"
2421                 $dsprsig = XML::unescape(XML::getFirstNodeValue($xpath, "dfrn:diaspora_signature/text()", $entry));
2422                 if ($dsprsig != "") {
2423                         $item["dsprsig"] = $dsprsig;
2424                 }
2425
2426                 $item["verb"] = XML::getFirstNodeValue($xpath, "activity:verb/text()", $entry);
2427
2428                 if (XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry) != "") {
2429                         $item["object-type"] = XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry);
2430                 }
2431
2432                 $object = $xpath->query("activity:object", $entry)->item(0);
2433                 $item["object"] = self::transformActivity($xpath, $object, "object");
2434
2435                 if (trim($item["object"]) != "") {
2436                         $r = XML::parseString($item["object"], false);
2437                         if (isset($r->type)) {
2438                                 $item["object-type"] = $r->type;
2439                         }
2440                 }
2441
2442                 $target = $xpath->query("activity:target", $entry)->item(0);
2443                 $item["target"] = self::transformActivity($xpath, $target, "target");
2444
2445                 $categories = $xpath->query("atom:category", $entry);
2446                 if ($categories) {
2447                         foreach ($categories as $category) {
2448                                 $term = "";
2449                                 $scheme = "";
2450                                 foreach ($category->attributes as $attributes) {
2451                                         if ($attributes->name == "term") {
2452                                                 $term = $attributes->textContent;
2453                                         }
2454
2455                                         if ($attributes->name == "scheme") {
2456                                                 $scheme = $attributes->textContent;
2457                                         }
2458                                 }
2459
2460                                 if (($term != "") && ($scheme != "")) {
2461                                         $parts = explode(":", $scheme);
2462                                         if ((count($parts) >= 4) && (array_shift($parts) == "X-DFRN")) {
2463                                                 $termhash = array_shift($parts);
2464                                                 $termurl = implode(":", $parts);
2465
2466                                                 if (!empty($item["tag"])) {
2467                                                         $item["tag"] .= ",";
2468                                                 } else {
2469                                                         $item["tag"] = "";
2470                                                 }
2471
2472                                                 $item["tag"] .= $termhash . "[url=" . $termurl . "]" . $term . "[/url]";
2473                                         }
2474                                 }
2475                         }
2476                 }
2477
2478                 $links = $xpath->query("atom:link", $entry);
2479                 if ($links) {
2480                         self::parseLinks($links, $item);
2481                 }
2482
2483                 $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
2484
2485                 $conv = $xpath->query('ostatus:conversation', $entry);
2486                 if (is_object($conv->item(0))) {
2487                         foreach ($conv->item(0)->attributes as $attributes) {
2488                                 if ($attributes->name == "ref") {
2489                                         $item['conversation-uri'] = $attributes->textContent;
2490                                 }
2491                                 if ($attributes->name == "href") {
2492                                         $item['conversation-href'] = $attributes->textContent;
2493                                 }
2494                         }
2495                 }
2496
2497                 // Is it a reply or a top level posting?
2498                 $item["parent-uri"] = $item["uri"];
2499
2500                 $inreplyto = $xpath->query("thr:in-reply-to", $entry);
2501                 if (is_object($inreplyto->item(0))) {
2502                         foreach ($inreplyto->item(0)->attributes as $attributes) {
2503                                 if ($attributes->name == "ref") {
2504                                         $item["parent-uri"] = $attributes->textContent;
2505                                 }
2506                         }
2507                 }
2508
2509                 // Get the type of the item (Top level post, reply or remote reply)
2510                 $entrytype = self::getEntryType($importer, $item);
2511
2512                 // Now assign the rest of the values that depend on the type of the message
2513                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2514                         if (!isset($item["object-type"])) {
2515                                 $item["object-type"] = ACTIVITY_OBJ_COMMENT;
2516                         }
2517
2518                         if ($item["contact-id"] != $owner["contact-id"]) {
2519                                 $item["contact-id"] = $owner["contact-id"];
2520                         }
2521
2522                         if (($item["network"] != $owner["network"]) && ($owner["network"] != "")) {
2523                                 $item["network"] = $owner["network"];
2524                         }
2525
2526                         if ($item["contact-id"] != $author["contact-id"]) {
2527                                 $item["contact-id"] = $author["contact-id"];
2528                         }
2529
2530                         if (($item["network"] != $author["network"]) && ($author["network"] != "")) {
2531                                 $item["network"] = $author["network"];
2532                         }
2533                 }
2534
2535                 if ($entrytype == DFRN::REPLY_RC) {
2536                         $item["wall"] = 1;
2537                 } elseif ($entrytype == DFRN::TOP_LEVEL) {
2538                         if (!isset($item["object-type"])) {
2539                                 $item["object-type"] = ACTIVITY_OBJ_NOTE;
2540                         }
2541
2542                         // Is it an event?
2543                         if (($item["object-type"] == ACTIVITY_OBJ_EVENT) && !$owner_unknown) {
2544                                 Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
2545                                 $ev = Event::fromBBCode($item["body"]);
2546                                 if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
2547                                         Logger::log("Event in item ".$item["uri"]." was found.", Logger::DEBUG);
2548                                         $ev["cid"]     = $importer["id"];
2549                                         $ev["uid"]     = $importer["importer_uid"];
2550                                         $ev["uri"]     = $item["uri"];
2551                                         $ev["edited"]  = $item["edited"];
2552                                         $ev["private"] = $item["private"];
2553                                         $ev["guid"]    = $item["guid"];
2554                                         $ev["plink"]   = $item["plink"];
2555
2556                                         $condition = ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]];
2557                                         $event = DBA::selectFirst('event', ['id'], $condition);
2558                                         if (DBA::isResult($event)) {
2559                                                 $ev["id"] = $event["id"];
2560                                         }
2561
2562                                         $event_id = Event::store($ev);
2563                                         Logger::log("Event ".$event_id." was stored", Logger::DEBUG);
2564                                         return;
2565                                 }
2566                         }
2567                 }
2568
2569                 if (!self::processVerbs($entrytype, $importer, $item, $is_like)) {
2570                         Logger::log("Exiting because 'processVerbs' told us so", Logger::DEBUG);
2571                         return;
2572                 }
2573
2574                 // This check is done here to be able to receive connection requests in "processVerbs"
2575                 if (($entrytype == DFRN::TOP_LEVEL) && $owner_unknown) {
2576                         Logger::log("Item won't be stored because user " . $importer["importer_uid"] . " doesn't follow " . $item["owner-link"] . ".", Logger::DEBUG);
2577                         return;
2578                 }
2579
2580
2581                 // Update content if 'updated' changes
2582                 if (DBA::isResult($current)) {
2583                         if (self::updateContent($current, $item, $importer, $entrytype)) {
2584                                 Logger::log("Item ".$item["uri"]." was updated.", Logger::DEBUG);
2585                         } else {
2586                                 Logger::log("Item " . $item["uri"] . " already existed.", Logger::DEBUG);
2587                         }
2588                         return;
2589                 }
2590
2591                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2592                         $posted_id = Item::insert($item);
2593                         if ($posted_id) {
2594                                 Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
2595
2596                                 if ($item['uid'] == 0) {
2597                                         Item::distribute($posted_id);
2598                                 }
2599
2600                                 return true;
2601                         }
2602                 } else { // $entrytype == DFRN::TOP_LEVEL
2603                         if (($importer["uid"] == 0) && ($importer["importer_uid"] != 0)) {
2604                                 Logger::log("Contact ".$importer["id"]." isn't known to user ".$importer["importer_uid"].". The post will be ignored.", Logger::DEBUG);
2605                                 return;
2606                         }
2607                         if (!Strings::compareLink($item["owner-link"], $importer["url"])) {
2608                                 /*
2609                                  * The item owner info is not our contact. It's OK and is to be expected if this is a tgroup delivery,
2610                                  * but otherwise there's a possible data mixup on the sender's system.
2611                                  * the tgroup delivery code called from Item::insert will correct it if it's a forum,
2612                                  * but we're going to unconditionally correct it here so that the post will always be owned by our contact.
2613                                  */
2614                                 Logger::log('Correcting item owner.', Logger::DEBUG);
2615                                 $item["owner-link"] = $importer["url"];
2616                                 $item["owner-id"] = Contact::getIdForURL($importer["url"], 0);
2617                         }
2618
2619                         if (($importer["rel"] == Contact::FOLLOWER) && (!self::tgroupCheck($importer["importer_uid"], $item))) {
2620                                 Logger::log("Contact ".$importer["id"]." is only follower and tgroup check was negative.", Logger::DEBUG);
2621                                 return;
2622                         }
2623
2624                         // This is my contact on another system, but it's really me.
2625                         // Turn this into a wall post.
2626                         $notify = Item::isRemoteSelf($importer, $item);
2627
2628                         $posted_id = Item::insert($item, false, $notify);
2629
2630                         if ($notify) {
2631                                 $posted_id = $notify;
2632                         }
2633
2634                         Logger::log("Item was stored with id ".$posted_id, Logger::DEBUG);
2635
2636                         if ($item['uid'] == 0) {
2637                                 Item::distribute($posted_id);
2638                         }
2639
2640                         if (stristr($item["verb"], ACTIVITY_POKE)) {
2641                                 $item['id'] = $posted_id;
2642                                 self::doPoke($item, $importer);
2643                         }
2644                 }
2645         }
2646
2647         /**
2648          * @brief Deletes items
2649          *
2650          * @param object $xpath    XPath object
2651          * @param object $deletion deletion elements
2652          * @param array  $importer Record of the importer user mixed with contact of the content
2653          * @return void
2654          * @throws \Exception
2655          * @todo  set proper type-hints
2656          */
2657         private static function processDeletion($xpath, $deletion, $importer)
2658         {
2659                 Logger::log("Processing deletions");
2660                 $uri = null;
2661
2662                 foreach ($deletion->attributes as $attributes) {
2663                         if ($attributes->name == "ref") {
2664                                 $uri = $attributes->textContent;
2665                         }
2666                 }
2667
2668                 if (!$uri || !$importer["id"]) {
2669                         return false;
2670                 }
2671
2672                 $condition = ['uri' => $uri, 'uid' => $importer["importer_uid"]];
2673                 $item = Item::selectFirst(['id', 'parent', 'contact-id', 'file', 'deleted'], $condition);
2674                 if (!DBA::isResult($item)) {
2675                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " wasn't found.", Logger::DEBUG);
2676                         return;
2677                 }
2678
2679                 if (strstr($item['file'], '[')) {
2680                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " is filed. So it won't be deleted.", Logger::DEBUG);
2681                         return;
2682                 }
2683
2684                 // When it is a starting post it has to belong to the person that wants to delete it
2685                 if (($item['id'] == $item['parent']) && ($item['contact-id'] != $importer["id"])) {
2686                         Logger::log("Item with uri " . $uri . " don't belong to contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2687                         return;
2688                 }
2689
2690                 // Comments can be deleted by the thread owner or comment owner
2691                 if (($item['id'] != $item['parent']) && ($item['contact-id'] != $importer["id"])) {
2692                         $condition = ['id' => $item['parent'], 'contact-id' => $importer["id"]];
2693                         if (!Item::exists($condition)) {
2694                                 Logger::log("Item with uri " . $uri . " wasn't found or mustn't be deleted by contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2695                                 return;
2696                         }
2697                 }
2698
2699                 if ($item["deleted"]) {
2700                         return;
2701                 }
2702
2703                 Logger::log('deleting item '.$item['id'].' uri='.$uri, Logger::DEBUG);
2704
2705                 Item::delete(['id' => $item['id']]);
2706         }
2707
2708         /**
2709          * @brief Imports a DFRN message
2710          *
2711          * @param string $xml          The DFRN message
2712          * @param array  $importer     Record of the importer user mixed with contact of the content
2713          * @param bool   $sort_by_date Is used when feeds are polled
2714          * @return integer Import status
2715          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2716          * @throws \ImagickException
2717          * @todo  set proper type-hints
2718          */
2719         public static function import($xml, $importer, $sort_by_date = false)
2720         {
2721                 if ($xml == "") {
2722                         return 400;
2723                 }
2724
2725                 $doc = new DOMDocument();
2726                 @$doc->loadXML($xml);
2727
2728                 $xpath = new DOMXPath($doc);
2729                 $xpath->registerNamespace("atom", NAMESPACE_ATOM1);
2730                 $xpath->registerNamespace("thr", NAMESPACE_THREAD);
2731                 $xpath->registerNamespace("at", NAMESPACE_TOMB);
2732                 $xpath->registerNamespace("media", NAMESPACE_MEDIA);
2733                 $xpath->registerNamespace("dfrn", NAMESPACE_DFRN);
2734                 $xpath->registerNamespace("activity", NAMESPACE_ACTIVITY);
2735                 $xpath->registerNamespace("georss", NAMESPACE_GEORSS);
2736                 $xpath->registerNamespace("poco", NAMESPACE_POCO);
2737                 $xpath->registerNamespace("ostatus", NAMESPACE_OSTATUS);
2738                 $xpath->registerNamespace("statusnet", NAMESPACE_STATUSNET);
2739
2740                 $header = [];
2741                 $header["uid"] = $importer["importer_uid"];
2742                 $header["network"] = Protocol::DFRN;
2743                 $header["wall"] = 0;
2744                 $header["origin"] = 0;
2745                 $header["contact-id"] = $importer["id"];
2746
2747                 // Update the contact table if the data has changed
2748
2749                 // The "atom:author" is only present in feeds
2750                 if ($xpath->query("/atom:feed/atom:author")->length > 0) {
2751                         self::fetchauthor($xpath, $doc->firstChild, $importer, "atom:author", false, $xml);
2752                 }
2753
2754                 // Only the "dfrn:owner" in the head section contains all data
2755                 if ($xpath->query("/atom:feed/dfrn:owner")->length > 0) {
2756                         self::fetchauthor($xpath, $doc->firstChild, $importer, "dfrn:owner", false, $xml);
2757                 }
2758
2759                 Logger::log("Import DFRN message for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2760
2761                 // is it a public forum? Private forums aren't exposed with this method
2762                 $forum = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:community/text()"));
2763
2764                 // The account type is new since 3.5.1
2765                 if ($xpath->query("/atom:feed/dfrn:account_type")->length > 0) {
2766                         // Hint: We are using separate update calls for uid=0 and uid!=0 since a combined call is bad for the database performance
2767
2768                         $accounttype = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:account_type/text()"));
2769
2770                         if ($accounttype != $importer["contact-type"]) {
2771                                 DBA::update('contact', ['contact-type' => $accounttype], ['id' => $importer['id']]);
2772
2773                                 // Updating the public contact as well
2774                                 DBA::update('contact', ['contact-type' => $accounttype], ['uid' => 0, 'nurl' => $importer['nurl']]);
2775                         }
2776                         // A forum contact can either have set "forum" or "prv" - but not both
2777                         if ($accounttype == User::ACCOUNT_TYPE_COMMUNITY) {
2778                                 // It's a forum, so either set the public or private forum flag
2779                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `id` = ?', $forum, !$forum, $importer['id']];
2780                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2781
2782                                 // Updating the public contact as well
2783                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `uid` = 0 AND `nurl` = ?', $forum, !$forum, $importer['nurl']];
2784                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2785                         } else {
2786                                 // It's not a forum, so remove the flags
2787                                 $condition = ['(`forum` OR `prv`) AND `id` = ?', $importer['id']];
2788                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2789
2790                                 // Updating the public contact as well
2791                                 $condition = ['(`forum` OR `prv`) AND `uid` = 0 AND `nurl` = ?', $importer['nurl']];
2792                                 DBA::update('contact', ['forum' => false, 'prv' => false], $condition);
2793                         }
2794                 } elseif ($forum != $importer["forum"]) { // Deprecated since 3.5.1
2795                         $condition = ['`forum` != ? AND `id` = ?', $forum, $importer["id"]];
2796                         DBA::update('contact', ['forum' => $forum], $condition);
2797
2798                         // Updating the public contact as well
2799                         $condition = ['`forum` != ? AND `uid` = 0 AND `nurl` = ?', $forum, $importer['nurl']];
2800                         DBA::update('contact', ['forum' => $forum], $condition);
2801                 }
2802
2803
2804                 // We are processing relocations even if we are ignoring a contact
2805                 $relocations = $xpath->query("/atom:feed/dfrn:relocate");
2806                 foreach ($relocations as $relocation) {
2807                         self::processRelocation($xpath, $relocation, $importer);
2808                 }
2809
2810                 if (($importer["uid"] != 0) && !$importer["readonly"]) {
2811                         $mails = $xpath->query("/atom:feed/dfrn:mail");
2812                         foreach ($mails as $mail) {
2813                                 self::processMail($xpath, $mail, $importer);
2814                         }
2815
2816                         $suggestions = $xpath->query("/atom:feed/dfrn:suggest");
2817                         foreach ($suggestions as $suggestion) {
2818                                 self::processSuggestion($xpath, $suggestion, $importer);
2819                         }
2820                 }
2821
2822                 $deletions = $xpath->query("/atom:feed/at:deleted-entry");
2823                 foreach ($deletions as $deletion) {
2824                         self::processDeletion($xpath, $deletion, $importer);
2825                 }
2826
2827                 if (!$sort_by_date) {
2828                         $entries = $xpath->query("/atom:feed/atom:entry");
2829                         foreach ($entries as $entry) {
2830                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2831                         }
2832                 } else {
2833                         $newentries = [];
2834                         $entries = $xpath->query("/atom:feed/atom:entry");
2835                         foreach ($entries as $entry) {
2836                                 $created = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2837                                 $newentries[strtotime($created)] = $entry;
2838                         }
2839
2840                         // Now sort after the publishing date
2841                         ksort($newentries);
2842
2843                         foreach ($newentries as $entry) {
2844                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2845                         }
2846                 }
2847                 Logger::log("Import done for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2848                 return 200;
2849         }
2850
2851         /**
2852          * @param App    $a            App
2853          * @param string $contact_nick contact nickname
2854          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2855          */
2856         public static function autoRedir(App $a, $contact_nick)
2857         {
2858                 // prevent looping
2859                 if (!empty($_REQUEST['redir'])) {
2860                         Logger::log('autoRedir might be looping because redirect has been redirected', Logger::DEBUG);
2861                         // looping prevention also appears to sometimes prevent authentication for images
2862                         // because browser may have multiple connections open and load an image on a connection
2863                         // whose session wasn't updated when a previous redirect authenticated
2864                         // Leaving commented in case looping reappears
2865                         //return;
2866                 }
2867
2868                 if ((! $contact_nick) || ($contact_nick === $a->user['nickname'])) {
2869                         return;
2870                 }
2871
2872                 if (local_user()) {
2873                         // We need to find out if $contact_nick is a user on this hub, and if so, if I
2874                         // am a contact of that user. However, that user may have other contacts with the
2875                         // same nickname as me on other hubs or other networks. Exclude these by requiring
2876                         // that the contact have a local URL. I will be the only person with my nickname at
2877                         // this URL, so if a result is found, then I am a contact of the $contact_nick user.
2878                         //
2879                         // We also have to make sure that I'm a legitimate contact--I'm not blocked or pending.
2880
2881                         $baseurl = System::baseUrl();
2882                         $domain_st = strpos($baseurl, "://");
2883                         if ($domain_st === false) {
2884                                 return;
2885                         }
2886                         $baseurl = substr($baseurl, $domain_st + 3);
2887                         $nurl = Strings::normaliseLink($baseurl);
2888
2889                         $r = User::getByNickname($contact_nick, ["uid"]);
2890                         $contact_uid = $r["uid"];
2891
2892                         /// @todo Why is there a query for "url" *and* "nurl"? Especially this normalising is strange.
2893                         $r = q("SELECT `id` FROM `contact` WHERE `uid` = (SELECT `uid` FROM `user` WHERE `nickname` = '%s' LIMIT 1)
2894                                         AND `nick` = '%s' AND NOT `self` AND (`url` LIKE '%%%s%%' OR `nurl` LIKE '%%%s%%') AND NOT `blocked` AND NOT `pending` LIMIT 1",
2895                                 DBA::escape($contact_nick),
2896                                 DBA::escape($a->user['nickname']),
2897                                 DBA::escape($baseurl),
2898                                 DBA::escape($nurl)
2899                         );
2900                         if ((! DBA::isResult($r))) {
2901                                 return;
2902                         }
2903                         // test if redirect authentication already succeeded
2904                         // Note that "contact" in the sense used in the $contact_nick argument to this function
2905                         // and the sense in the $remote[]["cid"] in the session are opposite.
2906                         // In the session variable the user currently fetching is the contact
2907                         // while $contact_nick is the nick of tho user who owns the stuff being fetched.
2908                         foreach (\Friendica\Core\Session::get('remote', []) as $visitor) {
2909                                 if ($visitor['uid'] == $contact_uid && $visitor['cid'] == $r[0]['id']) {
2910                                         return;
2911                                 }
2912                         }
2913
2914                         $r = q("SELECT * FROM contact WHERE nick = '%s'
2915                                         AND network = '%s' AND uid = %d  AND url LIKE '%%%s%%' LIMIT 1",
2916                                 DBA::escape($contact_nick),
2917                                 DBA::escape(Protocol::DFRN),
2918                                 intval(local_user()),
2919                                 DBA::escape($baseurl)
2920                         );
2921                         if (! DBA::isResult($r)) {
2922                                 return;
2923                         }
2924
2925                         $cid = $r[0]['id'];
2926
2927                         $dfrn_id = (($r[0]['issued-id']) ? $r[0]['issued-id'] : $r[0]['dfrn-id']);
2928
2929                         if ($r[0]['duplex'] && $r[0]['issued-id']) {
2930                                 $orig_id = $r[0]['issued-id'];
2931                                 $dfrn_id = '1:' . $orig_id;
2932                         }
2933                         if ($r[0]['duplex'] && $r[0]['dfrn-id']) {
2934                                 $orig_id = $r[0]['dfrn-id'];
2935                                 $dfrn_id = '0:' . $orig_id;
2936                         }
2937
2938                         // ensure that we've got a valid ID. There may be some edge cases with forums and non-duplex mode
2939                         // that may have triggered some of the "went to {profile/intro} and got an RSS feed" issues
2940
2941                         if (strlen($dfrn_id) < 3) {
2942                                 return;
2943                         }
2944
2945                         $sec = Strings::getRandomHex();
2946
2947                         DBA::insert('profile_check', ['uid' => local_user(), 'cid' => $cid, 'dfrn_id' => $dfrn_id, 'sec' => $sec, 'expire' => time() + 45]);
2948
2949                         $url = curPageURL();
2950
2951                         Logger::log('auto_redir: ' . $r[0]['name'] . ' ' . $sec, Logger::DEBUG);
2952                         $dest = (($url) ? '&destination_url=' . $url : '');
2953                         System::externalRedirect($r[0]['poll'] . '?dfrn_id=' . $dfrn_id
2954                                 . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile&sec=' . $sec . $dest);
2955                 }
2956
2957                 return;
2958         }
2959
2960         /**
2961          * @brief Returns the activity verb
2962          *
2963          * @param array $item Item array
2964          *
2965          * @return string activity verb
2966          */
2967         private static function constructVerb(array $item)
2968         {
2969                 if ($item['verb']) {
2970                         return $item['verb'];
2971                 }
2972                 return ACTIVITY_POST;
2973         }
2974
2975         private static function tgroupCheck($uid, $item)
2976         {
2977                 $mention = false;
2978
2979                 // check that the message originated elsewhere and is a top-level post
2980
2981                 if ($item['wall'] || $item['origin'] || ($item['uri'] != $item['parent-uri'])) {
2982                         return false;
2983                 }
2984
2985                 $user = DBA::selectFirst('user', ['page-flags', 'nickname'], ['uid' => $uid]);
2986                 if (!DBA::isResult($user)) {
2987                         return false;
2988                 }
2989
2990                 $community_page = ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY);
2991                 $prvgroup = ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP);
2992
2993                 $link = Strings::normaliseLink(System::baseUrl() . '/profile/' . $user['nickname']);
2994
2995                 /*
2996                  * Diaspora uses their own hardwired link URL in @-tags
2997                  * instead of the one we supply with webfinger
2998                  */
2999                 $dlink = Strings::normaliseLink(System::baseUrl() . '/u/' . $user['nickname']);
3000
3001                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
3002                 if ($cnt) {
3003                         foreach ($matches as $mtch) {
3004                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
3005                                         $mention = true;
3006                                         Logger::log('mention found: ' . $mtch[2]);
3007                                 }
3008                         }
3009                 }
3010
3011                 if (!$mention) {
3012                         return false;
3013                 }
3014
3015                 return $community_page || $prvgroup;
3016         }
3017
3018         /**
3019          * This function returns true if $update has an edited timestamp newer
3020          * than $existing, i.e. $update contains new data which should override
3021          * what's already there.  If there is no timestamp yet, the update is
3022          * assumed to be newer.  If the update has no timestamp, the existing
3023          * item is assumed to be up-to-date.  If the timestamps are equal it
3024          * assumes the update has been seen before and should be ignored.
3025          *
3026          * @param $existing
3027          * @param $update
3028          * @return bool
3029          * @throws \Exception
3030          */
3031         private static function isEditedTimestampNewer($existing, $update)
3032         {
3033                 if (empty($existing['edited'])) {
3034                         return true;
3035                 }
3036                 if (empty($update['edited'])) {
3037                         return false;
3038                 }
3039
3040                 $existing_edited = DateTimeFormat::utc($existing['edited']);
3041                 $update_edited = DateTimeFormat::utc($update['edited']);
3042
3043                 return (strcmp($existing_edited, $update_edited) < 0);
3044         }
3045
3046         /**
3047          * Checks if the given contact url does support DFRN
3048          *
3049          * @param string  $url    profile url
3050          * @param boolean $update Update the profile
3051          * @return boolean
3052          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3053          * @throws \ImagickException
3054          */
3055         public static function isSupportedByContactUrl($url, $update = false)
3056         {
3057                 $probe = Probe::uri($url, Protocol::DFRN, 0, !$update);
3058                 return $probe['network'] == Protocol::DFRN;
3059         }
3060 }