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\Addon;
  18 use Friendica\Core\Config;
  19 use Friendica\Core\L10n;
  20 use Friendica\Core\Logger;
  21 use Friendica\Core\Protocol;
  22 use Friendica\Core\System;
  23 use Friendica\Database\DBA;
  24 use Friendica\Model\Contact;
  25 use Friendica\Model\Conversation;
  26 use Friendica\Model\Event;
  27 use Friendica\Model\GContact;
  28 use Friendica\Model\Item;
  29 use Friendica\Model\PermissionSet;
  30 use Friendica\Model\Profile;
  31 use Friendica\Model\User;
  32 use Friendica\Object\Image;
  33 use Friendica\Util\Crypto;
  34 use Friendica\Util\DateTimeFormat;
  35 use Friendica\Util\Network;
  36 use Friendica\Util\XML;
  37 use HTMLPurifier;
  38 use HTMLPurifier_Config;
  39
  40 require_once 'boot.php';
  41 require_once 'include/dba.php';
  42 require_once "include/enotify.php";
  43 require_once "include/items.php";
  44 require_once "include/text.php";
  45
  46 /**
  47  * @brief This class contain functions to create and send DFRN XML files
  48  */
  49 class DFRN
  50 {
  51
  52         const TOP_LEVEL = 0;    // Top level posting
  53         const REPLY = 1;                // Regular reply that is stored locally
  54         const REPLY_RC = 2;     // Reply that will be relayed
  55
  56         /**
  57          * @brief Generates an array of contact and user for DFRN imports
  58          *
  59          * This array contains not only the receiver but also the sender of the message.
  60          *
  61          * @param integer $cid Contact id
  62          * @param integer $uid User id
  63          *
  64          * @return array importer
  65          */
  66         public static function getImporter($cid, $uid = 0)
  67         {
  68                 $condition = ['id' => $cid, 'blocked' => false, 'pending' => false];
  69                 $contact = DBA::selectFirst('contact', [], $condition);
  70                 if (!DBA::isResult($contact)) {
  71                         return [];
  72                 }
  73
  74                 $contact['cpubkey'] = $contact['pubkey'];
  75                 $contact['cprvkey'] = $contact['prvkey'];
  76                 $contact['senderName'] = $contact['name'];
  77
  78                 if ($uid != 0) {
  79                         $condition = ['uid' => $uid, 'account_expired' => false, 'account_removed' => false];
  80                         $user = DBA::selectFirst('user', [], $condition);
  81                         if (!DBA::isResult($user)) {
  82                                 return [];
  83                         }
  84
  85                         $user['importer_uid'] = $user['uid'];
  86                         $user['uprvkey'] = $user['prvkey'];
  87                 } else {
  88                         $user = ['importer_uid' => 0, 'uprvkey' => '', 'timezone' => 'UTC',
  89                                 'nickname' => '', 'sprvkey' => '', 'spubkey' => '',
  90                                 'page-flags' => 0, 'account-type' => 0, 'prvnets' => 0];
  91                 }
  92
  93                 return array_merge($contact, $user);
  94         }
  95
  96         /**
  97          * @brief Generates the atom entries for delivery.php
  98          *
  99          * This function is used whenever content is transmitted via DFRN.
 100          *
 101          * @param array $items Item elements
 102          * @param array $owner Owner record
 103          *
 104          * @return string DFRN entries
 105          * @todo Find proper type-hints
 106          */
 107         public static function entries($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                         $root->appendChild($entry);
 126                 }
 127
 128                 return trim($doc->saveXML());
 129         }
 130
 131         /**
 132          * @brief Generate an atom feed for the given user
 133          *
 134          * This function is called when another server is pulling data from the user feed.
 135          *
 136          * @param string  $dfrn_id     DFRN ID from the requesting party
 137          * @param string  $owner_nick  Owner nick name
 138          * @param string  $last_update Date of the last update
 139          * @param int     $direction   Can be -1, 0 or 1.
 140          * @param boolean $onlyheader  Output only the header without content? (Default is "no")
 141          *
 142          * @return string DFRN feed entries
 143          */
 144         public static function feed($dfrn_id, $owner_nick, $last_update, $direction = 0, $onlyheader = false)
 145         {
 146                 $a = get_app();
 147
 148                 $sitefeed    = ((strlen($owner_nick)) ? false : true); // not yet implemented, need to rewrite huge chunks of following logic
 149                 $public_feed = (($dfrn_id) ? false : true);
 150                 $starred     = false;   // not yet implemented, possible security issues
 151                 $converse    = false;
 152
 153                 if ($public_feed && $a->argc > 2) {
 154                         for ($x = 2; $x < $a->argc; $x++) {
 155                                 if ($a->argv[$x] == 'converse') {
 156                                         $converse = true;
 157                                 }
 158                                 if ($a->argv[$x] == 'starred') {
 159                                         $starred = true;
 160                                 }
 161                                 if ($a->argv[$x] == 'category' && $a->argc > ($x + 1) && strlen($a->argv[$x+1])) {
 162                                         $category = $a->argv[$x+1];
 163                                 }
 164                         }
 165                 }
 166
 167                 // default permissions - anonymous user
 168
 169                 $sql_extra = " AND NOT `item`.`private` ";
 170
 171                 $r = q(
 172                         "SELECT `contact`.*, `user`.`nickname`, `user`.`timezone`, `user`.`page-flags`, `user`.`account-type`
 173                         FROM `contact` INNER JOIN `user` ON `user`.`uid` = `contact`.`uid`
 174                         WHERE `contact`.`self` AND `user`.`nickname` = '%s' LIMIT 1",
 175                         DBA::escape($owner_nick)
 176                 );
 177
 178                 if (! DBA::isResult($r)) {
 179                         Logger::log(sprintf('No contact found for nickname=%d', $owner_nick), Logger::WARNING);
 180                         killme();
 181                 }
 182
 183                 $owner = $r[0];
 184                 $owner_id = $owner['uid'];
 185                 $owner_nick = $owner['nickname'];
 186
 187                 $sql_post_table = "";
 188
 189                 if (! $public_feed) {
 190                         $sql_extra = '';
 191                         switch ($direction) {
 192                                 case (-1):
 193                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 194                                         $my_id = $dfrn_id;
 195                                         break;
 196                                 case 0:
 197                                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 198                                         $my_id = '1:' . $dfrn_id;
 199                                         break;
 200                                 case 1:
 201                                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 202                                         $my_id = '0:' . $dfrn_id;
 203                                         break;
 204                                 default:
 205                                         return false;
 206                                         break; // NOTREACHED
 207                         }
 208
 209                         $r = q(
 210                                 "SELECT * FROM `contact` WHERE NOT `blocked` AND `contact`.`uid` = %d $sql_extra LIMIT 1",
 211                                 intval($owner_id)
 212                         );
 213
 214                         if (! DBA::isResult($r)) {
 215                                 Logger::log(sprintf('No contact found for uid=%d', $owner_id), Logger::WARNING);
 216                                 killme();
 217                         }
 218
 219                         $contact = $r[0];
 220
 221                         $set = PermissionSet::get($owner_id, $contact['id']);
 222
 223                         if (!empty($set)) {
 224                                 $sql_extra = " AND `item`.`psid` IN (" . implode(',', $set) .")";
 225                         } else {
 226                                 $sql_extra = " AND NOT `item`.`private`";
 227                         }
 228                 }
 229
 230                 if ($public_feed) {
 231                         $sort = 'DESC';
 232                 } else {
 233                         $sort = 'ASC';
 234                 }
 235
 236                 if (! strlen($last_update)) {
 237                         $last_update = 'now -30 days';
 238                 }
 239
 240                 if (isset($category)) {
 241                         $sql_post_table = sprintf(
 242                                 "INNER JOIN (SELECT `oid` FROM `term` WHERE `term` = '%s' AND `otype` = %d AND `type` = %d AND `uid` = %d ORDER BY `tid` DESC) AS `term` ON `item`.`id` = `term`.`oid` ",
 243                                 DBA::escape(protect_sprintf($category)),
 244                                 intval(TERM_OBJ_POST),
 245                                 intval(TERM_CATEGORY),
 246                                 intval($owner_id)
 247                         );
 248                         //$sql_extra .= FileTag::fileQuery('item',$category,'category');
 249                 }
 250
 251                 if ($public_feed && ! $converse) {
 252                         $sql_extra .= " AND `contact`.`self` = 1 ";
 253                 }
 254
 255                 $check_date = DateTimeFormat::utc($last_update);
 256
 257                 $r = q(
 258                         "SELECT `item`.`id`
 259                         FROM `item` USE INDEX (`uid_wall_changed`) $sql_post_table
 260                         STRAIGHT_JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
 261                         WHERE `item`.`uid` = %d AND `item`.`wall` AND `item`.`changed` > '%s'
 262                         $sql_extra
 263                         ORDER BY `item`.`parent` ".$sort.", `item`.`created` ASC LIMIT 0, 300",
 264                         intval($owner_id),
 265                         DBA::escape($check_date),
 266                         DBA::escape($sort)
 267                 );
 268
 269                 $ids = [];
 270                 foreach ($r as $item) {
 271                         $ids[] = $item['id'];
 272                 }
 273
 274                 if (!empty($ids)) {
 275                         $ret = Item::select(Item::DELIVER_FIELDLIST, ['id' => $ids]);
 276                         $items = Item::inArray($ret);
 277                 } else {
 278                         $items = [];
 279                 }
 280
 281                 /*
 282                  * Will check further below if this actually returned results.
 283                  * We will provide an empty feed if that is the case.
 284                  */
 285
 286                 $doc = new DOMDocument('1.0', 'utf-8');
 287                 $doc->formatOutput = true;
 288
 289                 $alternatelink = $owner['url'];
 290
 291                 if (isset($category)) {
 292                         $alternatelink .= "/category/".$category;
 293                 }
 294
 295                 if ($public_feed) {
 296                         $author = "dfrn:owner";
 297                 } else {
 298                         $author = "author";
 299                 }
 300
 301                 $root = self::addHeader($doc, $owner, $author, $alternatelink, true);
 302
 303                 /// @TODO This hook can't work anymore
 304                 //      Addon::callHooks('atom_feed', $atom);
 305
 306                 if (!DBA::isResult($items) || $onlyheader) {
 307                         $atom = trim($doc->saveXML());
 308
 309                         Addon::callHooks('atom_feed_end', $atom);
 310
 311                         return $atom;
 312                 }
 313
 314                 foreach ($items as $item) {
 315                         // prevent private email from leaking.
 316                         if ($item['network'] == Protocol::MAIL) {
 317                                 continue;
 318                         }
 319
 320                         // public feeds get html, our own nodes use bbcode
 321
 322                         if ($public_feed) {
 323                                 $type = 'html';
 324                                 // catch any email that's in a public conversation and make sure it doesn't leak
 325                                 if ($item['private']) {
 326                                         continue;
 327                                 }
 328                         } else {
 329                                 $type = 'text';
 330                         }
 331
 332                         $entry = self::entry($doc, $type, $item, $owner, true);
 333                         $root->appendChild($entry);
 334                 }
 335
 336                 $atom = trim($doc->saveXML());
 337
 338                 Addon::callHooks('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 $conversation Show the conversation. If false show the single post.
 348          *
 349          * @return string DFRN feed entry
 350          */
 351         public static function itemFeed($item_id, $conversation = false)
 352         {
 353                 if ($conversation) {
 354                         $condition = ['parent' => $item_id];
 355                 } else {
 356                         $condition = ['id' => $item_id];
 357                 }
 358
 359                 $ret = Item::select(Item::DELIVER_FIELDLIST, $condition);
 360                 $items = Item::inArray($ret);
 361                 if (!DBA::isResult($items)) {
 362                         killme();
 363                 }
 364
 365                 $item = $items[0];
 366
 367                 if ($item['uid'] != 0) {
 368                         $owner = User::getOwnerDataById($item['uid']);
 369                         if (!$owner) {
 370                                 killme();
 371                         }
 372                 } else {
 373                         $owner = ['uid' => 0, 'nick' => 'feed-item'];
 374                 }
 375
 376                 $doc = new DOMDocument('1.0', 'utf-8');
 377                 $doc->formatOutput = true;
 378                 $type = 'html';
 379
 380                 if ($conversation) {
 381                         $root = $doc->createElementNS(NAMESPACE_ATOM1, 'feed');
 382                         $doc->appendChild($root);
 383
 384                         $root->setAttribute("xmlns:thr", NAMESPACE_THREAD);
 385                         $root->setAttribute("xmlns:at", NAMESPACE_TOMB);
 386                         $root->setAttribute("xmlns:media", NAMESPACE_MEDIA);
 387                         $root->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
 388                         $root->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
 389                         $root->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
 390                         $root->setAttribute("xmlns:poco", NAMESPACE_POCO);
 391                         $root->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
 392                         $root->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
 393
 394                         //$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 395
 396                         foreach ($items as $item) {
 397                                 $entry = self::entry($doc, $type, $item, $owner, true, 0);
 398                                 $root->appendChild($entry);
 399                         }
 400                 } else {
 401                         $root = self::entry($doc, $type, $item, $owner, true, 0, true);
 402                 }
 403
 404                 $atom = trim($doc->saveXML());
 405                 return $atom;
 406         }
 407
 408         /**
 409          * @brief Create XML text for DFRN mails
 410          *
 411          * @param array $item  message elements
 412          * @param array $owner Owner record
 413          *
 414          * @return string DFRN mail
 415          * @todo Find proper type-hints
 416          */
 417         public static function mail($item, $owner)
 418         {
 419                 $doc = new DOMDocument('1.0', 'utf-8');
 420                 $doc->formatOutput = true;
 421
 422                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 423
 424                 $mail = $doc->createElement("dfrn:mail");
 425                 $sender = $doc->createElement("dfrn:sender");
 426
 427                 XML::addElement($doc, $sender, "dfrn:name", $owner['name']);
 428                 XML::addElement($doc, $sender, "dfrn:uri", $owner['url']);
 429                 XML::addElement($doc, $sender, "dfrn:avatar", $owner['thumb']);
 430
 431                 $mail->appendChild($sender);
 432
 433                 XML::addElement($doc, $mail, "dfrn:id", $item['uri']);
 434                 XML::addElement($doc, $mail, "dfrn:in-reply-to", $item['parent-uri']);
 435                 XML::addElement($doc, $mail, "dfrn:sentdate", DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM));
 436                 XML::addElement($doc, $mail, "dfrn:subject", $item['title']);
 437                 XML::addElement($doc, $mail, "dfrn:content", $item['body']);
 438
 439                 $root->appendChild($mail);
 440
 441                 return trim($doc->saveXML());
 442         }
 443
 444         /**
 445          * @brief Create XML text for DFRN friend suggestions
 446          *
 447          * @param array $item  suggestion elements
 448          * @param array $owner Owner record
 449          *
 450          * @return string DFRN suggestions
 451          * @todo Find proper type-hints
 452          */
 453         public static function fsuggest($item, $owner)
 454         {
 455                 $doc = new DOMDocument('1.0', 'utf-8');
 456                 $doc->formatOutput = true;
 457
 458                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 459
 460                 $suggest = $doc->createElement("dfrn:suggest");
 461
 462                 XML::addElement($doc, $suggest, "dfrn:url", $item['url']);
 463                 XML::addElement($doc, $suggest, "dfrn:name", $item['name']);
 464                 XML::addElement($doc, $suggest, "dfrn:photo", $item['photo']);
 465                 XML::addElement($doc, $suggest, "dfrn:request", $item['request']);
 466                 XML::addElement($doc, $suggest, "dfrn:note", $item['note']);
 467
 468                 $root->appendChild($suggest);
 469
 470                 return trim($doc->saveXML());
 471         }
 472
 473         /**
 474          * @brief Create XML text for DFRN relocations
 475          *
 476          * @param array $owner Owner record
 477          * @param int   $uid   User ID
 478          *
 479          * @return string DFRN relocations
 480          * @todo Find proper type-hints
 481          */
 482         public static function relocate($owner, $uid)
 483         {
 484
 485                 /* get site pubkey. this could be a new installation with no site keys*/
 486                 $pubkey = Config::get('system', 'site_pubkey');
 487                 if (! $pubkey) {
 488                         $res = Crypto::newKeypair(1024);
 489                         Config::set('system', 'site_prvkey', $res['prvkey']);
 490                         Config::set('system', 'site_pubkey', $res['pubkey']);
 491                 }
 492
 493                 $rp = q(
 494                         "SELECT `resource-id` , `scale`, type FROM `photo`
 495                                 WHERE `profile` = 1 AND `uid` = %d ORDER BY scale;",
 496                         $uid
 497                 );
 498                 $photos = [];
 499                 $ext = Image::supportedTypes();
 500
 501                 foreach ($rp as $p) {
 502                         $photos[$p['scale']] = System::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
 503                 }
 504
 505
 506                 $doc = new DOMDocument('1.0', 'utf-8');
 507                 $doc->formatOutput = true;
 508
 509                 $root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 510
 511                 $relocate = $doc->createElement("dfrn:relocate");
 512
 513                 XML::addElement($doc, $relocate, "dfrn:url", $owner['url']);
 514                 XML::addElement($doc, $relocate, "dfrn:name", $owner['name']);
 515                 XML::addElement($doc, $relocate, "dfrn:addr", $owner['addr']);
 516                 XML::addElement($doc, $relocate, "dfrn:avatar", $owner['avatar']);
 517                 XML::addElement($doc, $relocate, "dfrn:photo", $photos[4]);
 518                 XML::addElement($doc, $relocate, "dfrn:thumb", $photos[5]);
 519                 XML::addElement($doc, $relocate, "dfrn:micro", $photos[6]);
 520                 XML::addElement($doc, $relocate, "dfrn:request", $owner['request']);
 521                 XML::addElement($doc, $relocate, "dfrn:confirm", $owner['confirm']);
 522                 XML::addElement($doc, $relocate, "dfrn:notify", $owner['notify']);
 523                 XML::addElement($doc, $relocate, "dfrn:poll", $owner['poll']);
 524                 XML::addElement($doc, $relocate, "dfrn:sitepubkey", Config::get('system', 'site_pubkey'));
 525
 526                 $root->appendChild($relocate);
 527
 528                 return trim($doc->saveXML());
 529         }
 530
 531         /**
 532          * @brief Adds the header elements for the DFRN protocol
 533          *
 534          * @param object $doc           XML document
 535          * @param array  $owner         Owner record
 536          * @param string $authorelement Element name for the author
 537          * @param string $alternatelink link to profile or category
 538          * @param bool   $public        Is it a header for public posts?
 539          *
 540          * @return object XML root object
 541          * @todo Find proper type-hints
 542          */
 543         private static function addHeader($doc, $owner, $authorelement, $alternatelink = "", $public = false)
 544         {
 545
 546                 if ($alternatelink == "") {
 547                         $alternatelink = $owner['url'];
 548                 }
 549
 550                 $root = $doc->createElementNS(NAMESPACE_ATOM1, 'feed');
 551                 $doc->appendChild($root);
 552
 553                 $root->setAttribute("xmlns:thr", NAMESPACE_THREAD);
 554                 $root->setAttribute("xmlns:at", NAMESPACE_TOMB);
 555                 $root->setAttribute("xmlns:media", NAMESPACE_MEDIA);
 556                 $root->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
 557                 $root->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
 558                 $root->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
 559                 $root->setAttribute("xmlns:poco", NAMESPACE_POCO);
 560                 $root->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
 561                 $root->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
 562
 563                 XML::addElement($doc, $root, "id", System::baseUrl()."/profile/".$owner["nick"]);
 564                 XML::addElement($doc, $root, "title", $owner["name"]);
 565
 566                 $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION];
 567                 XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
 568
 569                 $attributes = ["rel" => "license", "href" => "http://creativecommons.org/licenses/by/3.0/"];
 570                 XML::addElement($doc, $root, "link", "", $attributes);
 571
 572                 $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $alternatelink];
 573                 XML::addElement($doc, $root, "link", "", $attributes);
 574
 575
 576                 if ($public) {
 577                         // DFRN itself doesn't uses this. But maybe someone else wants to subscribe to the public feed.
 578                         OStatus::hublinks($doc, $root, $owner["nick"]);
 579
 580                         $attributes = ["rel" => "salmon", "href" => System::baseUrl()."/salmon/".$owner["nick"]];
 581                         XML::addElement($doc, $root, "link", "", $attributes);
 582
 583                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-replies", "href" => System::baseUrl()."/salmon/".$owner["nick"]];
 584                         XML::addElement($doc, $root, "link", "", $attributes);
 585
 586                         $attributes = ["rel" => "http://salmon-protocol.org/ns/salmon-mention", "href" => System::baseUrl()."/salmon/".$owner["nick"]];
 587                         XML::addElement($doc, $root, "link", "", $attributes);
 588                 }
 589
 590                 // For backward compatibility we keep this element
 591                 if ($owner['page-flags'] == Contact::PAGE_COMMUNITY) {
 592                         XML::addElement($doc, $root, "dfrn:community", 1);
 593                 }
 594
 595                 // The former element is replaced by this one
 596                 XML::addElement($doc, $root, "dfrn:account_type", $owner["account-type"]);
 597
 598                 /// @todo We need a way to transmit the different page flags like "Contact::PAGE_PRVGROUP"
 599
 600                 XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 601
 602                 $author = self::addAuthor($doc, $owner, $authorelement, $public);
 603                 $root->appendChild($author);
 604
 605                 return $root;
 606         }
 607
 608         /**
 609          * @brief Adds the author element in the header for the DFRN protocol
 610          *
 611          * @param object  $doc           XML document
 612          * @param array   $owner         Owner record
 613          * @param string  $authorelement Element name for the author
 614          * @param boolean $public        boolean
 615          *
 616          * @return object XML author object
 617          * @todo Find proper type-hints
 618          */
 619         private static function addAuthor($doc, $owner, $authorelement, $public)
 620         {
 621                 // Is the profile hidden or shouldn't be published in the net? Then add the "hide" element
 622                 $r = q(
 623                         "SELECT `id` FROM `profile` INNER JOIN `user` ON `user`.`uid` = `profile`.`uid`
 624                                 WHERE (`hidewall` OR NOT `net-publish`) AND `user`.`uid` = %d",
 625                         intval($owner['uid'])
 626                 );
 627                 if (DBA::isResult($r)) {
 628                         $hidewall = true;
 629                 } else {
 630                         $hidewall = false;
 631                 }
 632
 633                 $author = $doc->createElement($authorelement);
 634
 635                 $namdate = DateTimeFormat::utc($owner['name-date'].'+00:00', DateTimeFormat::ATOM);
 636                 $uridate = DateTimeFormat::utc($owner['uri-date'].'+00:00', DateTimeFormat::ATOM);
 637                 $picdate = DateTimeFormat::utc($owner['avatar-date'].'+00:00', DateTimeFormat::ATOM);
 638
 639                 $attributes = [];
 640
 641                 if (!$public || !$hidewall) {
 642                         $attributes = ["dfrn:updated" => $namdate];
 643                 }
 644
 645                 XML::addElement($doc, $author, "name", $owner["name"], $attributes);
 646                 XML::addElement($doc, $author, "uri", System::baseUrl().'/profile/'.$owner["nickname"], $attributes);
 647                 XML::addElement($doc, $author, "dfrn:handle", $owner["addr"], $attributes);
 648
 649                 $attributes = ["rel" => "photo", "type" => "image/jpeg",
 650                                         "media:width" => 300, "media:height" => 300, "href" => $owner['photo']];
 651
 652                 if (!$public || !$hidewall) {
 653                         $attributes["dfrn:updated"] = $picdate;
 654                 }
 655
 656                 XML::addElement($doc, $author, "link", "", $attributes);
 657
 658                 $attributes["rel"] = "avatar";
 659                 XML::addElement($doc, $author, "link", "", $attributes);
 660
 661                 if ($hidewall) {
 662                         XML::addElement($doc, $author, "dfrn:hide", "true");
 663                 }
 664
 665                 // The following fields will only be generated if the data isn't meant for a public feed
 666                 if ($public) {
 667                         return $author;
 668                 }
 669
 670                 $birthday = feed_birthday($owner['uid'], $owner['timezone']);
 671
 672                 if ($birthday) {
 673                         XML::addElement($doc, $author, "dfrn:birthday", $birthday);
 674                 }
 675
 676                 // Only show contact details when we are allowed to
 677                 $r = q(
 678                         "SELECT `profile`.`about`, `profile`.`name`, `profile`.`homepage`, `user`.`nickname`,
 679                                 `user`.`timezone`, `profile`.`locality`, `profile`.`region`, `profile`.`country-name`,
 680                                 `profile`.`pub_keywords`, `profile`.`xmpp`, `profile`.`dob`
 681                         FROM `profile`
 682                                 INNER JOIN `user` ON `user`.`uid` = `profile`.`uid`
 683                                 WHERE `profile`.`is-default` AND NOT `user`.`hidewall` AND `user`.`uid` = %d",
 684                         intval($owner['uid'])
 685                 );
 686                 if (DBA::isResult($r)) {
 687                         $profile = $r[0];
 688
 689                         XML::addElement($doc, $author, "poco:displayName", $profile["name"]);
 690                         XML::addElement($doc, $author, "poco:updated", $namdate);
 691
 692                         if (trim($profile["dob"]) > '0001-01-01') {
 693                                 XML::addElement($doc, $author, "poco:birthday", "0000-".date("m-d", strtotime($profile["dob"])));
 694                         }
 695
 696                         XML::addElement($doc, $author, "poco:note", $profile["about"]);
 697                         XML::addElement($doc, $author, "poco:preferredUsername", $profile["nickname"]);
 698
 699                         $savetz = date_default_timezone_get();
 700                         date_default_timezone_set($profile["timezone"]);
 701                         XML::addElement($doc, $author, "poco:utcOffset", date("P"));
 702                         date_default_timezone_set($savetz);
 703
 704                         if (trim($profile["homepage"]) != "") {
 705                                 $urls = $doc->createElement("poco:urls");
 706                                 XML::addElement($doc, $urls, "poco:type", "homepage");
 707                                 XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
 708                                 XML::addElement($doc, $urls, "poco:primary", "true");
 709                                 $author->appendChild($urls);
 710                         }
 711
 712                         if (trim($profile["pub_keywords"]) != "") {
 713                                 $keywords = explode(",", $profile["pub_keywords"]);
 714
 715                                 foreach ($keywords as $keyword) {
 716                                         XML::addElement($doc, $author, "poco:tags", trim($keyword));
 717                                 }
 718                         }
 719
 720                         if (trim($profile["xmpp"]) != "") {
 721                                 $ims = $doc->createElement("poco:ims");
 722                                 XML::addElement($doc, $ims, "poco:type", "xmpp");
 723                                 XML::addElement($doc, $ims, "poco:value", $profile["xmpp"]);
 724                                 XML::addElement($doc, $ims, "poco:primary", "true");
 725                                 $author->appendChild($ims);
 726                         }
 727
 728                         if (trim($profile["locality"].$profile["region"].$profile["country-name"]) != "") {
 729                                 $element = $doc->createElement("poco:address");
 730
 731                                 XML::addElement($doc, $element, "poco:formatted", Profile::formatLocation($profile));
 732
 733                                 if (trim($profile["locality"]) != "") {
 734                                         XML::addElement($doc, $element, "poco:locality", $profile["locality"]);
 735                                 }
 736
 737                                 if (trim($profile["region"]) != "") {
 738                                         XML::addElement($doc, $element, "poco:region", $profile["region"]);
 739                                 }
 740
 741                                 if (trim($profile["country-name"]) != "") {
 742                                         XML::addElement($doc, $element, "poco:country", $profile["country-name"]);
 743                                 }
 744
 745                                 $author->appendChild($element);
 746                         }
 747                 }
 748
 749                 return $author;
 750         }
 751
 752         /**
 753          * @brief Adds the author elements in the "entry" elements of the DFRN protocol
 754          *
 755          * @param object $doc         XML document
 756          * @param string $element     Element name for the author
 757          * @param string $contact_url Link of the contact
 758          * @param array  $item        Item elements
 759          *
 760          * @return object XML author object
 761          * @todo Find proper type-hints
 762          */
 763         private static function addEntryAuthor($doc, $element, $contact_url, $item)
 764         {
 765                 $contact = Contact::getDetailsByURL($contact_url, $item["uid"]);
 766
 767                 $author = $doc->createElement($element);
 768                 XML::addElement($doc, $author, "name", $contact["name"]);
 769                 XML::addElement($doc, $author, "uri", $contact["url"]);
 770                 XML::addElement($doc, $author, "dfrn:handle", $contact["addr"]);
 771
 772                 /// @Todo
 773                 /// - Check real image type and image size
 774                 /// - Check which of these boths elements we should use
 775                 $attributes = [
 776                                 "rel" => "photo",
 777                                 "type" => "image/jpeg",
 778                                 "media:width" => 80,
 779                                 "media:height" => 80,
 780                                 "href" => $contact["photo"]];
 781                 XML::addElement($doc, $author, "link", "", $attributes);
 782
 783                 $attributes = [
 784                                 "rel" => "avatar",
 785                                 "type" => "image/jpeg",
 786                                 "media:width" => 80,
 787                                 "media:height" => 80,
 788                                 "href" => $contact["photo"]];
 789                 XML::addElement($doc, $author, "link", "", $attributes);
 790
 791                 return $author;
 792         }
 793
 794         /**
 795          * @brief Adds the activity elements
 796          *
 797          * @param object $doc      XML document
 798          * @param string $element  Element name for the activity
 799          * @param string $activity activity value
 800          *
 801          * @return object XML activity object
 802          * @todo Find proper type-hints
 803          */
 804         private static function createActivity($doc, $element, $activity)
 805         {
 806                 if ($activity) {
 807                         $entry = $doc->createElement($element);
 808
 809                         $r = XML::parseString($activity, false);
 810                         if (!$r) {
 811                                 return false;
 812                         }
 813
 814                         if ($r->type) {
 815                                 XML::addElement($doc, $entry, "activity:object-type", $r->type);
 816                         }
 817
 818                         if ($r->id) {
 819                                 XML::addElement($doc, $entry, "id", $r->id);
 820                         }
 821
 822                         if ($r->title) {
 823                                 XML::addElement($doc, $entry, "title", $r->title);
 824                         }
 825
 826                         if ($r->link) {
 827                                 if (substr($r->link, 0, 1) == '<') {
 828                                         if (strstr($r->link, '&') && (! strstr($r->link, '&amp;'))) {
 829                                                 $r->link = str_replace('&', '&amp;', $r->link);
 830                                         }
 831
 832                                         $r->link = preg_replace('/\<link(.*?)\"\>/', '<link$1"/>', $r->link);
 833
 834                                         // XML does need a single element as root element so we add a dummy element here
 835                                         $data = XML::parseString("<dummy>" . $r->link . "</dummy>", false);
 836                                         if (is_object($data)) {
 837                                                 foreach ($data->link as $link) {
 838                                                         $attributes = [];
 839                                                         foreach ($link->attributes() as $parameter => $value) {
 840                                                                 $attributes[$parameter] = $value;
 841                                                         }
 842                                                         XML::addElement($doc, $entry, "link", "", $attributes);
 843                                                 }
 844                                         }
 845                                 } else {
 846                                         $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $r->link];
 847                                         XML::addElement($doc, $entry, "link", "", $attributes);
 848                                 }
 849                         }
 850                         if ($r->content) {
 851                                 XML::addElement($doc, $entry, "content", BBCode::convert($r->content), ["type" => "html"]);
 852                         }
 853
 854                         return $entry;
 855                 }
 856
 857                 return false;
 858         }
 859
 860         /**
 861          * @brief Adds the elements for attachments
 862          *
 863          * @param object $doc  XML document
 864          * @param object $root XML root
 865          * @param array  $item Item element
 866          *
 867          * @return object XML attachment object
 868          * @todo Find proper type-hints
 869          */
 870         private static function getAttachment($doc, $root, $item)
 871         {
 872                 $arr = explode('[/attach],', $item['attach']);
 873                 if (count($arr)) {
 874                         foreach ($arr as $r) {
 875                                 $matches = false;
 876                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 877                                 if ($cnt) {
 878                                         $attributes = ["rel" => "enclosure",
 879                                                         "href" => $matches[1],
 880                                                         "type" => $matches[3]];
 881
 882                                         if (intval($matches[2])) {
 883                                                 $attributes["length"] = intval($matches[2]);
 884                                         }
 885
 886                                         if (trim($matches[4]) != "") {
 887                                                 $attributes["title"] = trim($matches[4]);
 888                                         }
 889
 890                                         XML::addElement($doc, $root, "link", "", $attributes);
 891                                 }
 892                         }
 893                 }
 894         }
 895
 896         /**
 897          * @brief Adds the "entry" elements for the DFRN protocol
 898          *
 899          * @param object $doc     XML document
 900          * @param string $type    "text" or "html"
 901          * @param array  $item    Item element
 902          * @param array  $owner   Owner record
 903          * @param bool   $comment Trigger the sending of the "comment" element
 904          * @param int    $cid     Contact ID of the recipient
 905          * @param bool   $single  If set, the entry is created as an XML document with a single "entry" element
 906          *
 907          * @return object XML entry object
 908          * @todo Find proper type-hints
 909          */
 910         private static function entry($doc, $type, array $item, array $owner, $comment = false, $cid = 0, $single = false)
 911         {
 912                 $mentioned = [];
 913
 914                 if (!$item['parent']) {
 915                         return;
 916                 }
 917
 918                 if ($item['deleted']) {
 919                         $attributes = ["ref" => $item['uri'], "when" => DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM)];
 920                         return XML::createElement($doc, "at:deleted-entry", "", $attributes);
 921                 }
 922
 923                 if (!$single) {
 924                         $entry = $doc->createElement("entry");
 925                 } else {
 926                         $entry = $doc->createElementNS(NAMESPACE_ATOM1, 'entry');
 927                         $doc->appendChild($entry);
 928
 929                         $entry->setAttribute("xmlns:thr", NAMESPACE_THREAD);
 930                         $entry->setAttribute("xmlns:at", NAMESPACE_TOMB);
 931                         $entry->setAttribute("xmlns:media", NAMESPACE_MEDIA);
 932                         $entry->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
 933                         $entry->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
 934                         $entry->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
 935                         $entry->setAttribute("xmlns:poco", NAMESPACE_POCO);
 936                         $entry->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
 937                         $entry->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
 938                 }
 939
 940                 if ($item['private']) {
 941                         $body = Item::fixPrivatePhotos($item['body'], $owner['uid'], $item, $cid);
 942                 } else {
 943                         $body = $item['body'];
 944                 }
 945
 946                 // Remove the abstract element. It is only locally important.
 947                 $body = BBCode::stripAbstract($body);
 948
 949                 $htmlbody = '';
 950                 if ($type == 'html') {
 951                         $htmlbody = $body;
 952
 953                         if ($item['title'] != "") {
 954                                 $htmlbody = "[b]" . $item['title'] . "[/b]\n\n" . $htmlbody;
 955                         }
 956
 957                         $htmlbody = BBCode::convert($htmlbody, false, 7);
 958                 }
 959
 960                 $author = self::addEntryAuthor($doc, "author", $item["author-link"], $item);
 961                 $entry->appendChild($author);
 962
 963                 $dfrnowner = self::addEntryAuthor($doc, "dfrn:owner", $item["owner-link"], $item);
 964                 $entry->appendChild($dfrnowner);
 965
 966                 if (($item['parent'] != $item['id']) || ($item['parent-uri'] !== $item['uri']) || (($item['thr-parent'] !== '') && ($item['thr-parent'] !== $item['uri']))) {
 967                         $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 968                         $parent = Item::selectFirst(['guid', 'plink'], ['uri' => $parent_item, 'uid' => $item['uid']]);
 969                         $attributes = ["ref" => $parent_item, "type" => "text/html",
 970                                                 "href" => $parent['plink'],
 971                                                 "dfrn:diaspora_guid" => $parent['guid']];
 972                         XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 973                 }
 974
 975                 // Add conversation data. This is used for OStatus
 976                 $conversation_href = System::baseUrl()."/display/".$owner["nick"]."/".$item["parent"];
 977                 $conversation_uri = $conversation_href;
 978
 979                 if (isset($parent_item)) {
 980                         $conversation = DBA::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $item['parent-uri']]);
 981                         if (DBA::isResult($conversation)) {
 982                                 if ($conversation['conversation-uri'] != '') {
 983                                         $conversation_uri = $conversation['conversation-uri'];
 984                                 }
 985                                 if ($conversation['conversation-href'] != '') {
 986                                         $conversation_href = $conversation['conversation-href'];
 987                                 }
 988                         }
 989                 }
 990
 991                 $attributes = [
 992                                 "href" => $conversation_href,
 993                                 "ref" => $conversation_uri];
 994
 995                 XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
 996
 997                 XML::addElement($doc, $entry, "id", $item["uri"]);
 998                 XML::addElement($doc, $entry, "title", $item["title"]);
 999
1000                 XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"] . "+00:00", DateTimeFormat::ATOM));
1001                 XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"] . "+00:00", DateTimeFormat::ATOM));
1002
1003                 // "dfrn:env" is used to read the content
1004                 XML::addElement($doc, $entry, "dfrn:env", base64url_encode($body, true));
1005
1006                 // The "content" field is not read by the receiver. We could remove it when the type is "text"
1007                 // We keep it at the moment, maybe there is some old version that doesn't read "dfrn:env"
1008                 XML::addElement($doc, $entry, "content", (($type == 'html') ? $htmlbody : $body), ["type" => $type]);
1009
1010                 // We save this value in "plink". Maybe we should read it from there as well?
1011                 XML::addElement(
1012                         $doc,
1013                         $entry,
1014                         "link",
1015                         "",
1016                         ["rel" => "alternate", "type" => "text/html",
1017                                  "href" => System::baseUrl() . "/display/" . $item["guid"]]
1018                 );
1019
1020                 // "comment-allow" is some old fashioned stuff for old Friendica versions.
1021                 // It is included in the rewritten code for completeness
1022                 if ($comment) {
1023                         XML::addElement($doc, $entry, "dfrn:comment-allow", 1);
1024                 }
1025
1026                 if ($item['location']) {
1027                         XML::addElement($doc, $entry, "dfrn:location", $item['location']);
1028                 }
1029
1030                 if ($item['coord']) {
1031                         XML::addElement($doc, $entry, "georss:point", $item['coord']);
1032                 }
1033
1034                 if ($item['private']) {
1035                         XML::addElement($doc, $entry, "dfrn:private", ($item['private'] ? $item['private'] : 1));
1036                 }
1037
1038                 if ($item['extid']) {
1039                         XML::addElement($doc, $entry, "dfrn:extid", $item['extid']);
1040                 }
1041
1042                 if ($item['post-type'] == Item::PT_PAGE) {
1043                         XML::addElement($doc, $entry, "dfrn:bookmark", "true");
1044                 }
1045
1046                 if ($item['app']) {
1047                         XML::addElement($doc, $entry, "statusnet:notice_info", "", ["local_id" => $item['id'], "source" => $item['app']]);
1048                 }
1049
1050                 XML::addElement($doc, $entry, "dfrn:diaspora_guid", $item["guid"]);
1051
1052                 // The signed text contains the content in Markdown, the sender handle and the signatur for the content
1053                 // It is needed for relayed comments to Diaspora.
1054                 if ($item['signed_text']) {
1055                         $sign = base64_encode(json_encode(['signed_text' => $item['signed_text'],'signature' => $item['signature'],'signer' => $item['signer']]));
1056                         XML::addElement($doc, $entry, "dfrn:diaspora_signature", $sign);
1057                 }
1058
1059                 XML::addElement($doc, $entry, "activity:verb", self::constructVerb($item));
1060
1061                 if ($item['object-type'] != "") {
1062                         XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
1063                 } elseif ($item['id'] == $item['parent']) {
1064                         XML::addElement($doc, $entry, "activity:object-type", ACTIVITY_OBJ_NOTE);
1065                 } else {
1066                         XML::addElement($doc, $entry, "activity:object-type", ACTIVITY_OBJ_COMMENT);
1067                 }
1068
1069                 $actobj = self::createActivity($doc, "activity:object", $item['object']);
1070                 if ($actobj) {
1071                         $entry->appendChild($actobj);
1072                 }
1073
1074                 $actarg = self::createActivity($doc, "activity:target", $item['target']);
1075                 if ($actarg) {
1076                         $entry->appendChild($actarg);
1077                 }
1078
1079                 $tags = Item::getFeedTags($item);
1080
1081                 /// @TODO Combine this with similar below if() block?
1082                 if (count($tags)) {
1083                         foreach ($tags as $t) {
1084                                 if (($type != 'html') || ($t[0] != "@")) {
1085                                         XML::addElement($doc, $entry, "category", "", ["scheme" => "X-DFRN:".$t[0].":".$t[1], "term" => $t[2]]);
1086                                 }
1087                         }
1088                 }
1089
1090                 if (count($tags)) {
1091                         foreach ($tags as $t) {
1092                                 if ($t[0] == "@") {
1093                                         $mentioned[$t[1]] = $t[1];
1094                                 }
1095                         }
1096                 }
1097
1098                 foreach ($mentioned as $mention) {
1099                         $condition = ['uid' => $owner["uid"], 'nurl' => normalise_link($mention)];
1100                         $contact = DBA::selectFirst('contact', ['forum', 'prv'], $condition);
1101
1102                         if (DBA::isResult($contact) && ($contact["forum"] || $contact["prv"])) {
1103                                 XML::addElement(
1104                                         $doc,
1105                                         $entry,
1106                                         "link",
1107                                         "",
1108                                         ["rel" => "mentioned",
1109                                                         "ostatus:object-type" => ACTIVITY_OBJ_GROUP,
1110                                                         "href" => $mention]
1111                                 );
1112                         } else {
1113                                 XML::addElement(
1114                                         $doc,
1115                                         $entry,
1116                                         "link",
1117                                         "",
1118                                         ["rel" => "mentioned",
1119                                                         "ostatus:object-type" => ACTIVITY_OBJ_PERSON,
1120                                                         "href" => $mention]
1121                                 );
1122                         }
1123                 }
1124
1125                 self::getAttachment($doc, $entry, $item);
1126
1127                 return $entry;
1128         }
1129
1130         /**
1131          * @brief encrypts data via AES
1132          *
1133          * @param string $data The data that is to be encrypted
1134          * @param string $key  The AES key
1135          *
1136          * @return string encrypted data
1137          */
1138         private static function aesEncrypt($data, $key)
1139         {
1140                 return openssl_encrypt($data, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1141         }
1142
1143         /**
1144          * @brief decrypts data via AES
1145          *
1146          * @param string $encrypted The encrypted data
1147          * @param string $key       The AES key
1148          *
1149          * @return string decrypted data
1150          */
1151         public static function aesDecrypt($encrypted, $key)
1152         {
1153                 return openssl_decrypt($encrypted, 'aes-128-ecb', $key, OPENSSL_RAW_DATA);
1154         }
1155
1156         /**
1157          * @brief Delivers the atom content to the contacts
1158          *
1159          * @param array  $owner    Owner record
1160          * @param array  $contact  Contact record of the receiver
1161          * @param string $atom     Content that will be transmitted
1162          * @param bool   $dissolve (to be documented)
1163          *
1164          * @return int Deliver status. Negative values mean an error.
1165          * @todo Add array type-hint for $owner, $contact
1166          */
1167         public static function deliver($owner, $contact, $atom, $dissolve = false, $legacy_transport = false)
1168         {
1169                 $a = get_app();
1170
1171                 // At first try the Diaspora transport layer
1172                 if (!$dissolve && !$legacy_transport) {
1173                         $curlResult = self::transmit($owner, $contact, $atom);
1174                         if ($curlResult >= 200) {
1175                                 Logger::log('Delivery via Diaspora transport layer was successful with status ' . $curlResult);
1176                                 return $curlResult;
1177                         }
1178                 }
1179
1180                 $idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);
1181
1182                 if ($contact['duplex'] && $contact['dfrn-id']) {
1183                         $idtosend = '0:' . $orig_id;
1184                 }
1185                 if ($contact['duplex'] && $contact['issued-id']) {
1186                         $idtosend = '1:' . $orig_id;
1187                 }
1188
1189                 $rino = Config::get('system', 'rino_encrypt');
1190                 $rino = intval($rino);
1191
1192                 Logger::log("Local rino version: ". $rino, Logger::DEBUG);
1193
1194                 $ssl_val = intval(Config::get('system', 'ssl_policy'));
1195                 $ssl_policy = '';
1196
1197                 switch ($ssl_val) {
1198                         case SSL_POLICY_FULL:
1199                                 $ssl_policy = 'full';
1200                                 break;
1201                         case SSL_POLICY_SELFSIGN:
1202                                 $ssl_policy = 'self';
1203                                 break;
1204                         case SSL_POLICY_NONE:
1205                         default:
1206                                 $ssl_policy = 'none';
1207                                 break;
1208                 }
1209
1210                 $url = $contact['notify'] . '&dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino='.$rino : '');
1211
1212                 Logger::log('dfrn_deliver: ' . $url);
1213
1214                 $curlResult = Network::curl($url);
1215
1216                 if ($curlResult->isTimeout()) {
1217                         Contact::markForArchival($contact);
1218                         return -2; // timed out
1219                 }
1220
1221                 $xml = $curlResult->getBody();
1222
1223                 $curl_stat = $curlResult->getReturnCode();
1224                 if (empty($curl_stat)) {
1225                         Contact::markForArchival($contact);
1226                         return -3; // timed out
1227                 }
1228
1229                 Logger::log('dfrn_deliver: ' . $xml, Logger::DATA);
1230
1231                 if (empty($xml)) {
1232                         Contact::markForArchival($contact);
1233                         return 3;
1234                 }
1235
1236                 if (strpos($xml, '<?xml') === false) {
1237                         Logger::log('dfrn_deliver: no valid XML returned');
1238                         Logger::log('dfrn_deliver: returned XML: ' . $xml, Logger::DATA);
1239                         Contact::markForArchival($contact);
1240                         return 3;
1241                 }
1242
1243                 $res = XML::parseString($xml);
1244
1245                 if (!is_object($res) || (intval($res->status) != 0) || !strlen($res->challenge) || !strlen($res->dfrn_id)) {
1246                         Contact::markForArchival($contact);
1247
1248                         if (empty($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'] == Contact::PAGE_COMMUNITY) ? 1 : 0);
1264
1265                 Logger::log("Remote rino version: ".$rino_remote_version." for ".$contact["url"], Logger::DEBUG);
1266
1267                 if ($owner['page-flags'] == Contact::PAGE_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                         || ($owner['page-flags'] == Contact::PAGE_COMMUNITY && strlen($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 != $orig_id) {
1301                         Logger::log('dfrn_deliver: wrong dfrn_id.');
1302                         // did not decode properly - cannot trust this site
1303                         Contact::markForArchival($contact);
1304                         return 3;
1305                 }
1306
1307                 $postvars['dfrn_id']      = $idtosend;
1308                 $postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;
1309                 if ($dissolve) {
1310                         $postvars['dissolve'] = '1';
1311                 }
1312
1313                 if ((($contact['rel']) && ($contact['rel'] != Contact::SHARING) && (! $contact['blocked'])) || ($owner['page-flags'] == Contact::PAGE_COMMUNITY)) {
1314                         $postvars['data'] = $atom;
1315                         $postvars['perm'] = 'rw';
1316                 } else {
1317                         $postvars['data'] = str_replace('<dfrn:comment-allow>1', '<dfrn:comment-allow>0', $atom);
1318                         $postvars['perm'] = 'r';
1319                 }
1320
1321                 $postvars['ssl_policy'] = $ssl_policy;
1322
1323                 if ($page) {
1324                         $postvars['page'] = $page;
1325                 }
1326
1327
1328                 if ($rino > 0 && $rino_remote_version > 0 && (! $dissolve)) {
1329                         Logger::log('rino version: '. $rino_remote_version);
1330
1331                         switch ($rino_remote_version) {
1332                                 case 1:
1333                                         $key = openssl_random_pseudo_bytes(16);
1334                                         $data = self::aesEncrypt($postvars['data'], $key);
1335                                         break;
1336
1337                                 default:
1338                                         Logger::log("rino: invalid requested version '$rino_remote_version'");
1339                                         Contact::markForArchival($contact);
1340                                         return -8;
1341                         }
1342
1343                         $postvars['rino'] = $rino_remote_version;
1344                         $postvars['data'] = bin2hex($data);
1345
1346                         if ($dfrn_version >= 2.1) {
1347                                 if (($contact['duplex'] && strlen($contact['pubkey']))
1348                                         || ($owner['page-flags'] == Contact::PAGE_COMMUNITY && strlen($contact['pubkey']))
1349                                         || ($contact['rel'] == Contact::SHARING && strlen($contact['pubkey']))
1350                                 ) {
1351                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1352                                 } else {
1353                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1354                                 }
1355                         } else {
1356                                 if (($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == Contact::PAGE_COMMUNITY)) {
1357                                         openssl_private_encrypt($key, $postvars['key'], $contact['prvkey']);
1358                                 } else {
1359                                         openssl_public_encrypt($key, $postvars['key'], $contact['pubkey']);
1360                                 }
1361                         }
1362
1363                         Logger::log('md5 rawkey ' . md5($postvars['key']));
1364
1365                         $postvars['key'] = bin2hex($postvars['key']);
1366                 }
1367
1368
1369                 Logger::log('dfrn_deliver: ' . "SENDING: " . print_r($postvars, true), Logger::DATA);
1370
1371                 $postResult = Network::post($contact['notify'], $postvars);
1372
1373                 $xml = $postResult->getBody();
1374
1375                 Logger::log('dfrn_deliver: ' . "RECEIVED: " . $xml, Logger::DATA);
1376
1377                 $curl_stat = $postResult->getReturnCode();
1378                 if (empty($curl_stat) || empty($xml)) {
1379                         Contact::markForArchival($contact);
1380                         return -9; // timed out
1381                 }
1382
1383                 if (($curl_stat == 503) && stristr($postResult->getHeader(), 'retry-after')) {
1384                         Contact::markForArchival($contact);
1385                         return -10;
1386                 }
1387
1388                 if (strpos($xml, '<?xml') === false) {
1389                         Logger::log('dfrn_deliver: phase 2: no valid XML returned');
1390                         Logger::log('dfrn_deliver: phase 2: returned XML: ' . $xml, Logger::DATA);
1391                         Contact::markForArchival($contact);
1392                         return 3;
1393                 }
1394
1395                 $res = XML::parseString($xml);
1396
1397                 if (!isset($res->status)) {
1398                         Contact::markForArchival($contact);
1399                         return -11;
1400                 }
1401
1402                 // Possibly old servers had returned an empty value when everything was okay
1403                 if (empty($res->status)) {
1404                         $res->status = 200;
1405                 }
1406
1407                 if (!empty($res->message)) {
1408                         Logger::log('Delivery returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1409                 }
1410
1411                 if (($res->status >= 200) && ($res->status <= 299)) {
1412                         Contact::unmarkForArchival($contact);
1413                 }
1414
1415                 return intval($res->status);
1416         }
1417
1418         /**
1419          * @brief Transmits atom content to the contacts via the Diaspora transport layer
1420          *
1421          * @param array  $owner    Owner record
1422          * @param array  $contact  Contact record of the receiver
1423          * @param string $atom     Content that will be transmitted
1424          *
1425          * @return int Deliver status. Negative values mean an error.
1426          */
1427         public static function transmit($owner, $contact, $atom, $public_batch = false)
1428         {
1429                 $a = get_app();
1430
1431                 if (!$public_batch) {
1432                         if (empty($contact['addr'])) {
1433                                 Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
1434                                 if (Contact::updateFromProbe($contact['id'])) {
1435                                         $new_contact = DBA::selectFirst('contact', ['addr'], ['id' => $contact['id']]);
1436                                         $contact['addr'] = $new_contact['addr'];
1437                                 }
1438
1439                                 if (empty($contact['addr'])) {
1440                                         Logger::log('Unable to find contact handle for ' . $contact['id'] . ' - ' . $contact['url']);
1441                                         Contact::markForArchival($contact);
1442                                         return -21;
1443                                 }
1444                         }
1445
1446                         $fcontact = Diaspora::personByHandle($contact['addr']);
1447                         if (empty($fcontact)) {
1448                                 Logger::log('Unable to find contact details for ' . $contact['id'] . ' - ' . $contact['addr']);
1449                                 Contact::markForArchival($contact);
1450                                 return -22;
1451                         }
1452                         $pubkey = $fcontact['pubkey'];
1453                 } else {
1454                         $pubkey = '';
1455                 }
1456
1457                 $envelope = Diaspora::buildMessage($atom, $owner, $contact, $owner['uprvkey'], $pubkey, $public_batch);
1458
1459                 // Create the endpoint for public posts. This is some WIP and should later be added to the probing
1460                 if ($public_batch && empty($contact["batch"])) {
1461                         $parts = parse_url($contact["notify"]);
1462                         $path_parts = explode('/', $parts['path']);
1463                         array_pop($path_parts);
1464                         $parts['path'] =  implode('/', $path_parts);
1465                         $contact["batch"] = Network::unparseURL($parts);
1466                 }
1467
1468                 $dest_url = ($public_batch ? $contact["batch"] : $contact["notify"]);
1469
1470                 $content_type = ($public_batch ? "application/magic-envelope+xml" : "application/json");
1471
1472                 $postResult = Network::post($dest_url, $envelope, ["Content-Type: ".$content_type]);
1473                 $xml = $postResult->getBody();
1474
1475                 $curl_stat = $postResult->getReturnCode();
1476                 if (empty($curl_stat) || empty($xml)) {
1477                         Logger::log('Empty answer from ' . $contact['id'] . ' - ' . $dest_url);
1478                         Contact::markForArchival($contact);
1479                         return -9; // timed out
1480                 }
1481
1482                 if (($curl_stat == 503) && (stristr($postResult->getHeader(), 'retry-after'))) {
1483                         Contact::markForArchival($contact);
1484                         return -10;
1485                 }
1486
1487                 if (strpos($xml, '<?xml') === false) {
1488                         Logger::log('No valid XML returned from ' . $contact['id'] . ' - ' . $dest_url);
1489                         Logger::log('Returned XML: ' . $xml, Logger::DATA);
1490                         Contact::markForArchival($contact);
1491                         return 3;
1492                 }
1493
1494                 $res = XML::parseString($xml);
1495
1496                 if (empty($res->status)) {
1497                         Contact::markForArchival($contact);
1498                         return -23;
1499                 }
1500
1501                 if (!empty($res->message)) {
1502                         Logger::log('Transmit to ' . $dest_url . ' returned status '.$res->status.' - '.$res->message, Logger::DEBUG);
1503                 }
1504
1505                 if (($res->status >= 200) && ($res->status <= 299)) {
1506                         Contact::unmarkForArchival($contact);
1507                 }
1508
1509                 return intval($res->status);
1510         }
1511
1512         /**
1513          * @brief Add new birthday event for this person
1514          *
1515          * @param array  $contact  Contact record
1516          * @param string $birthday Birthday of the contact
1517          * @return void
1518          * @todo Add array type-hint for $contact
1519          */
1520         private static function birthdayEvent($contact, $birthday)
1521         {
1522                 // Check for duplicates
1523                 $condition = ['uid' => $contact['uid'], 'cid' => $contact['id'],
1524                         'start' => DateTimeFormat::utc($birthday), 'type' => 'birthday'];
1525                 if (DBA::exists('event', $condition)) {
1526                         return;
1527                 }
1528
1529                 Logger::log('updating birthday: ' . $birthday . ' for contact ' . $contact['id']);
1530
1531                 $bdtext = L10n::t('%s\'s birthday', $contact['name']);
1532                 $bdtext2 = L10n::t('Happy Birthday %s', ' [url=' . $contact['url'] . ']' . $contact['name'] . '[/url]');
1533
1534                 $r = q(
1535                         "INSERT INTO `event` (`uid`,`cid`,`created`,`edited`,`start`,`finish`,`summary`,`desc`,`type`)
1536                         VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s') ",
1537                         intval($contact['uid']),
1538                         intval($contact['id']),
1539                         DBA::escape(DateTimeFormat::utcNow()),
1540                         DBA::escape(DateTimeFormat::utcNow()),
1541                         DBA::escape(DateTimeFormat::utc($birthday)),
1542                         DBA::escape(DateTimeFormat::utc($birthday . ' + 1 day ')),
1543                         DBA::escape($bdtext),
1544                         DBA::escape($bdtext2),
1545                         DBA::escape('birthday')
1546                 );
1547         }
1548
1549         /**
1550          * @brief Fetch the author data from head or entry items
1551          *
1552          * @param object $xpath     XPath object
1553          * @param object $context   In which context should the data be searched
1554          * @param array  $importer  Record of the importer user mixed with contact of the content
1555          * @param string $element   Element name from which the data is fetched
1556          * @param bool   $onlyfetch Should the data only be fetched or should it update the contact record as well
1557          * @param string $xml       optional, default empty
1558          *
1559          * @return array Relevant data of the author
1560          * @todo Find good type-hints for all parameter
1561          */
1562         private static function fetchauthor($xpath, $context, $importer, $element, $onlyfetch, $xml = "")
1563         {
1564                 $author = [];
1565                 $author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);
1566                 $author["link"] = XML::getFirstNodeValue($xpath, $element."/atom:uri/text()", $context);
1567
1568                 $fields = ['id', 'uid', 'url', 'network', 'avatar-date', 'avatar', 'name-date', 'uri-date', 'addr',
1569                         'name', 'nick', 'about', 'location', 'keywords', 'xmpp', 'bdyear', 'bd', 'hidden', 'contact-type'];
1570                 $condition = ["`uid` = ? AND `nurl` = ? AND `network` != ?",
1571                         $importer["importer_uid"], normalise_link($author["link"]), Protocol::STATUSNET];
1572                 $contact_old = DBA::selectFirst('contact', $fields, $condition);
1573
1574                 if (DBA::isResult($contact_old)) {
1575                         $author["contact-id"] = $contact_old["id"];
1576                         $author["network"] = $contact_old["network"];
1577                 } else {
1578                         if (!$onlyfetch) {
1579                                 Logger::log("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml, Logger::DEBUG);
1580                         }
1581
1582                         $author["contact-unknown"] = true;
1583                         $author["contact-id"] = $importer["id"];
1584                         $author["network"] = $importer["network"];
1585                         $onlyfetch = true;
1586                 }
1587
1588                 // Until now we aren't serving different sizes - but maybe later
1589                 $avatarlist = [];
1590                 /// @todo check if "avatar" or "photo" would be the best field in the specification
1591                 $avatars = $xpath->query($element . "/atom:link[@rel='avatar']", $context);
1592                 foreach ($avatars as $avatar) {
1593                         $href = "";
1594                         $width = 0;
1595                         foreach ($avatar->attributes as $attributes) {
1596                                 /// @TODO Rewrite these similar if() to one switch
1597                                 if ($attributes->name == "href") {
1598                                         $href = $attributes->textContent;
1599                                 }
1600                                 if ($attributes->name == "width") {
1601                                         $width = $attributes->textContent;
1602                                 }
1603                                 if ($attributes->name == "updated") {
1604                                         $author["avatar-date"] = $attributes->textContent;
1605                                 }
1606                         }
1607                         if (($width > 0) && ($href != "")) {
1608                                 $avatarlist[$width] = $href;
1609                         }
1610                 }
1611
1612                 if (count($avatarlist) > 0) {
1613                         krsort($avatarlist);
1614                         $author["avatar"] = current($avatarlist);
1615                 }
1616
1617                 if (empty($author['avatar']) && !empty($author['link'])) {
1618                         $cid = Contact::getIdForURL($author['link'], 0);
1619                         if (!empty($cid)) {
1620                                 $contact = DBA::selectFirst('contact', ['avatar'], ['id' => $cid]);
1621                                 if (DBA::isResult($contact)) {
1622                                         $author['avatar'] = $contact['avatar'];
1623                                 }
1624                         }
1625                 }
1626
1627                 if (empty($author['avatar'])) {
1628                         Logger::log('Empty author: ' . $xml);
1629                 }
1630
1631                 if (DBA::isResult($contact_old) && !$onlyfetch) {
1632                         Logger::log("Check if contact details for contact " . $contact_old["id"] . " (" . $contact_old["nick"] . ") have to be updated.", Logger::DEBUG);
1633
1634                         $poco = ["url" => $contact_old["url"]];
1635
1636                         // When was the last change to name or uri?
1637                         $name_element = $xpath->query($element . "/atom:name", $context)->item(0);
1638                         foreach ($name_element->attributes as $attributes) {
1639                                 if ($attributes->name == "updated") {
1640                                         $poco["name-date"] = $attributes->textContent;
1641                                 }
1642                         }
1643
1644                         $link_element = $xpath->query($element . "/atom:link", $context)->item(0);
1645                         foreach ($link_element->attributes as $attributes) {
1646                                 if ($attributes->name == "updated") {
1647                                         $poco["uri-date"] = $attributes->textContent;
1648                                 }
1649                         }
1650
1651                         // Update contact data
1652                         $value = XML::getFirstNodeValue($xpath, $element . "/dfrn:handle/text()", $context);
1653                         if ($value != "") {
1654                                 $poco["addr"] = $value;
1655                         }
1656
1657                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:displayName/text()", $context);
1658                         if ($value != "") {
1659                                 $poco["name"] = $value;
1660                         }
1661
1662                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:preferredUsername/text()", $context);
1663                         if ($value != "") {
1664                                 $poco["nick"] = $value;
1665                         }
1666
1667                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:note/text()", $context);
1668                         if ($value != "") {
1669                                 $poco["about"] = $value;
1670                         }
1671
1672                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:address/poco:formatted/text()", $context);
1673                         if ($value != "") {
1674                                 $poco["location"] = $value;
1675                         }
1676
1677                         /// @todo Only search for elements with "poco:type" = "xmpp"
1678                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:ims/poco:value/text()", $context);
1679                         if ($value != "") {
1680                                 $poco["xmpp"] = $value;
1681                         }
1682
1683                         /// @todo Add support for the following fields that we don't support by now in the contact table:
1684                         /// - poco:utcOffset
1685                         /// - poco:urls
1686                         /// - poco:locality
1687                         /// - poco:region
1688                         /// - poco:country
1689
1690                         // If the "hide" element is present then the profile isn't searchable.
1691                         $hide = intval(XML::getFirstNodeValue($xpath, $element . "/dfrn:hide/text()", $context) == "true");
1692
1693                         Logger::log("Hidden status for contact " . $contact_old["url"] . ": " . $hide, Logger::DEBUG);
1694
1695                         // If the contact isn't searchable then set the contact to "hidden".
1696                         // Problem: This can be manually overridden by the user.
1697                         if ($hide) {
1698                                 $contact_old["hidden"] = true;
1699                         }
1700
1701                         // Save the keywords into the contact table
1702                         $tags = [];
1703                         $tagelements = $xpath->evaluate($element . "/poco:tags/text()", $context);
1704                         foreach ($tagelements as $tag) {
1705                                 $tags[$tag->nodeValue] = $tag->nodeValue;
1706                         }
1707
1708                         if (count($tags)) {
1709                                 $poco["keywords"] = implode(", ", $tags);
1710                         }
1711
1712                         // "dfrn:birthday" contains the birthday converted to UTC
1713                         $birthday = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1714
1715                         if (strtotime($birthday) > time()) {
1716                                 $bd_timestamp = strtotime($birthday);
1717
1718                                 $poco["bdyear"] = date("Y", $bd_timestamp);
1719                         }
1720
1721                         // "poco:birthday" is the birthday in the format "yyyy-mm-dd"
1722                         $value = XML::getFirstNodeValue($xpath, $element . "/poco:birthday/text()", $context);
1723
1724                         if (!in_array($value, ["", "0000-00-00", "0001-01-01"])) {
1725                                 $bdyear = date("Y");
1726                                 $value = str_replace("0000", $bdyear, $value);
1727
1728                                 if (strtotime($value) < time()) {
1729                                         $value = str_replace($bdyear, $bdyear + 1, $value);
1730                                         $bdyear = $bdyear + 1;
1731                                 }
1732
1733                                 $poco["bd"] = $value;
1734                         }
1735
1736                         $contact = array_merge($contact_old, $poco);
1737
1738                         if ($contact_old["bdyear"] != $contact["bdyear"]) {
1739                                 self::birthdayEvent($contact, $birthday);
1740                         }
1741
1742                         // Get all field names
1743                         $fields = [];
1744                         foreach ($contact_old as $field => $data) {
1745                                 $fields[$field] = $data;
1746                         }
1747
1748                         unset($fields["id"]);
1749                         unset($fields["uid"]);
1750                         unset($fields["url"]);
1751                         unset($fields["avatar-date"]);
1752                         unset($fields["avatar"]);
1753                         unset($fields["name-date"]);
1754                         unset($fields["uri-date"]);
1755
1756                         $update = false;
1757                         // Update check for this field has to be done differently
1758                         $datefields = ["name-date", "uri-date"];
1759                         foreach ($datefields as $field) {
1760                                 // The date fields arrives as '2018-07-17T10:44:45Z' - the database return '2018-07-17 10:44:45'
1761                                 // The fields have to be in the same format to be comparable, since strtotime does add timezones.
1762                                 $contact[$field] = DateTimeFormat::utc($contact[$field]);
1763
1764                                 if (strtotime($contact[$field]) > strtotime($contact_old[$field])) {
1765                                         Logger::log("Difference for contact " . $contact["id"] . " in field '" . $field . "'. New value: '" . $contact[$field] . "', old value '" . $contact_old[$field] . "'", Logger::DEBUG);
1766                                         $update = true;
1767                                 }
1768                         }
1769
1770                         foreach ($fields as $field => $data) {
1771                                 if ($contact[$field] != $contact_old[$field]) {
1772                                         Logger::log("Difference for contact " . $contact["id"] . " in field '" . $field . "'. New value: '" . $contact[$field] . "', old value '" . $contact_old[$field] . "'", Logger::DEBUG);
1773                                         $update = true;
1774                                 }
1775                         }
1776
1777                         if ($update) {
1778                                 Logger::log("Update contact data for contact " . $contact["id"] . " (" . $contact["nick"] . ")", Logger::DEBUG);
1779
1780                                 q(
1781                                         "UPDATE `contact` SET `name` = '%s', `nick` = '%s', `about` = '%s', `location` = '%s',
1782                                         `addr` = '%s', `keywords` = '%s', `bdyear` = '%s', `bd` = '%s', `hidden` = %d,
1783                                         `xmpp` = '%s', `name-date`  = '%s', `uri-date` = '%s'
1784                                         WHERE `id` = %d AND `network` = '%s'",
1785                                         DBA::escape($contact["name"]), DBA::escape($contact["nick"]), DBA::escape($contact["about"]),   DBA::escape($contact["location"]),
1786                                         DBA::escape($contact["addr"]), DBA::escape($contact["keywords"]), DBA::escape($contact["bdyear"]),
1787                                         DBA::escape($contact["bd"]), intval($contact["hidden"]), DBA::escape($contact["xmpp"]),
1788                                         DBA::escape(DateTimeFormat::utc($contact["name-date"])), DBA::escape(DateTimeFormat::utc($contact["uri-date"])),
1789                                         intval($contact["id"]), DBA::escape($contact["network"])
1790                                 );
1791                         }
1792
1793                         Contact::updateAvatar(
1794                                 $author['avatar'],
1795                                 $importer['importer_uid'],
1796                                 $contact['id'],
1797                                 (strtotime($contact['avatar-date']) > strtotime($contact_old['avatar-date']) || ($author['avatar'] != $contact_old['avatar']))
1798                         );
1799
1800                         /*
1801                          * The generation is a sign for the reliability of the provided data.
1802                          * It is used in the socgraph.php to prevent that old contact data
1803                          * that was relayed over several servers can overwrite contact
1804                          * data that we received directly.
1805                          */
1806
1807                         $poco["generation"] = 2;
1808                         $poco["photo"] = $author["avatar"];
1809                         $poco["hide"] = $hide;
1810                         $poco["contact-type"] = $contact["contact-type"];
1811                         $gcid = GContact::update($poco);
1812
1813                         GContact::link($gcid, $importer["importer_uid"], $contact["id"]);
1814                 }
1815
1816                 return $author;
1817         }
1818
1819         /**
1820          * @brief Transforms activity objects into an XML string
1821          *
1822          * @param object $xpath    XPath object
1823          * @param object $activity Activity object
1824          * @param string $element  element name
1825          *
1826          * @return string XML string
1827          * @todo Find good type-hints for all parameter
1828          */
1829         private static function transformActivity($xpath, $activity, $element)
1830         {
1831                 if (!is_object($activity)) {
1832                         return "";
1833                 }
1834
1835                 $obj_doc = new DOMDocument("1.0", "utf-8");
1836                 $obj_doc->formatOutput = true;
1837
1838                 $obj_element = $obj_doc->createElementNS(NAMESPACE_ATOM1, $element);
1839
1840                 $activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
1841                 XML::addElement($obj_doc, $obj_element, "type", $activity_type);
1842
1843                 $id = $xpath->query("atom:id", $activity)->item(0);
1844                 if (is_object($id)) {
1845                         $obj_element->appendChild($obj_doc->importNode($id, true));
1846                 }
1847
1848                 $title = $xpath->query("atom:title", $activity)->item(0);
1849                 if (is_object($title)) {
1850                         $obj_element->appendChild($obj_doc->importNode($title, true));
1851                 }
1852
1853                 $links = $xpath->query("atom:link", $activity);
1854                 if (is_object($links)) {
1855                         foreach ($links as $link) {
1856                                 $obj_element->appendChild($obj_doc->importNode($link, true));
1857                         }
1858                 }
1859
1860                 $content = $xpath->query("atom:content", $activity)->item(0);
1861                 if (is_object($content)) {
1862                         $obj_element->appendChild($obj_doc->importNode($content, true));
1863                 }
1864
1865                 $obj_doc->appendChild($obj_element);
1866
1867                 $objxml = $obj_doc->saveXML($obj_element);
1868
1869                 /// @todo This isn't totally clean. We should find a way to transform the namespaces
1870                 $objxml = str_replace("<".$element.' xmlns="http://www.w3.org/2005/Atom">', "<".$element.">", $objxml);
1871                 return($objxml);
1872         }
1873
1874         /**
1875          * @brief Processes the mail elements
1876          *
1877          * @param object $xpath    XPath object
1878          * @param object $mail     mail elements
1879          * @param array  $importer Record of the importer user mixed with contact of the content
1880          * @return void
1881          * @todo Find good type-hints for all parameter
1882          */
1883         private static function processMail($xpath, $mail, $importer)
1884         {
1885                 Logger::log("Processing mails");
1886
1887                 /// @TODO Rewrite this to one statement
1888                 $msg = [];
1889                 $msg["uid"] = $importer["importer_uid"];
1890                 $msg["from-name"] = $xpath->query("dfrn:sender/dfrn:name/text()", $mail)->item(0)->nodeValue;
1891                 $msg["from-url"] = $xpath->query("dfrn:sender/dfrn:uri/text()", $mail)->item(0)->nodeValue;
1892                 $msg["from-photo"] = $xpath->query("dfrn:sender/dfrn:avatar/text()", $mail)->item(0)->nodeValue;
1893                 $msg["contact-id"] = $importer["id"];
1894                 $msg["uri"] = $xpath->query("dfrn:id/text()", $mail)->item(0)->nodeValue;
1895                 $msg["parent-uri"] = $xpath->query("dfrn:in-reply-to/text()", $mail)->item(0)->nodeValue;
1896                 $msg["created"] = DateTimeFormat::utc($xpath->query("dfrn:sentdate/text()", $mail)->item(0)->nodeValue);
1897                 $msg["title"] = $xpath->query("dfrn:subject/text()", $mail)->item(0)->nodeValue;
1898                 $msg["body"] = $xpath->query("dfrn:content/text()", $mail)->item(0)->nodeValue;
1899                 $msg["seen"] = 0;
1900                 $msg["replied"] = 0;
1901
1902                 DBA::insert('mail', $msg);
1903
1904                 $msg["id"] = DBA::lastInsertId();
1905
1906                 // send notifications.
1907                 /// @TODO Arange this mess
1908                 $notif_params = [
1909                         "type" => NOTIFY_MAIL,
1910                         "notify_flags" => $importer["notify-flags"],
1911                         "language" => $importer["language"],
1912                         "to_name" => $importer["username"],
1913                         "to_email" => $importer["email"],
1914                         "uid" => $importer["importer_uid"],
1915                         "item" => $msg,
1916                         "source_name" => $msg["from-name"],
1917                         "source_link" => $importer["url"],
1918                         "source_photo" => $importer["thumb"],
1919                         "verb" => ACTIVITY_POST,
1920                         "otype" => "mail"
1921                 ];
1922
1923                 notification($notif_params);
1924
1925                 Logger::log("Mail is processed, notification was sent.");
1926         }
1927
1928         /**
1929          * @brief Processes the suggestion elements
1930          *
1931          * @param object $xpath      XPath object
1932          * @param object $suggestion suggestion elements
1933          * @param array  $importer   Record of the importer user mixed with contact of the content
1934          * @return boolean
1935          * @todo Find good type-hints for all parameter
1936          */
1937         private static function processSuggestion($xpath, $suggestion, $importer)
1938         {
1939                 $a = get_app();
1940
1941                 Logger::log("Processing suggestions");
1942
1943                 /// @TODO Rewrite this to one statement
1944                 $suggest = [];
1945                 $suggest["uid"] = $importer["importer_uid"];
1946                 $suggest["cid"] = $importer["id"];
1947                 $suggest["url"] = $xpath->query("dfrn:url/text()", $suggestion)->item(0)->nodeValue;
1948                 $suggest["name"] = $xpath->query("dfrn:name/text()", $suggestion)->item(0)->nodeValue;
1949                 $suggest["photo"] = $xpath->query("dfrn:photo/text()", $suggestion)->item(0)->nodeValue;
1950                 $suggest["request"] = $xpath->query("dfrn:request/text()", $suggestion)->item(0)->nodeValue;
1951                 $suggest["body"] = $xpath->query("dfrn:note/text()", $suggestion)->item(0)->nodeValue;
1952
1953                 // Does our member already have a friend matching this description?
1954
1955                 /*
1956                  * The valid result means the friend we're about to send a friend
1957                  * suggestion already has them in their contact, which means no further
1958                  * action is required.
1959                  *
1960                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1961                  */
1962                 $condition = ['name' => $suggest["name"], 'nurl' => normalise_link($suggest["url"]),
1963                         'uid' => $suggest["uid"]];
1964                 if (DBA::exists('contact', $condition)) {
1965                         return false;
1966                 }
1967
1968                 // Do we already have an fcontact record for this person?
1969
1970                 $fid = 0;
1971                 $condition = ['url' => $suggest["url"], 'name' => $suggest["name"], 'request' => $suggest["request"]];
1972                 $fcontact = DBA::selectFirst('fcontact', ['id'], $condition);
1973                 if (DBA::isResult($fcontact)) {
1974                         $fid = $fcontact["id"];
1975
1976                         // OK, we do. Do we already have an introduction for this person?
1977                         if (DBA::exists('intro', ['uid' => $suggest["uid"], 'fid' => $fid])) {
1978                                 /*
1979                                  * The valid result means the friend we're about to send a friend
1980                                  * suggestion already has them in their contact, which means no further
1981                                  * action is required.
1982                                  *
1983                                  * @see https://github.com/friendica/friendica/pull/3254#discussion_r107315246
1984                                  */
1985                                 return false;
1986                         }
1987                 }
1988                 if (!$fid) {
1989                         $r = q(
1990                                 "INSERT INTO `fcontact` (`name`,`url`,`photo`,`request`) VALUES ('%s', '%s', '%s', '%s')",
1991                                 DBA::escape($suggest["name"]),
1992                                 DBA::escape($suggest["url"]),
1993                                 DBA::escape($suggest["photo"]),
1994                                 DBA::escape($suggest["request"])
1995                         );
1996                 }
1997
1998                 $condition = ['url' => $suggest["url"], 'name' => $suggest["name"], 'request' => $suggest["request"]];
1999                 $fcontact = DBA::selectFirst('fcontact', ['id'], $condition);
2000
2001                 /*
2002                  * If no record in fcontact is found, below INSERT statement will not
2003                  * link an introduction to it.
2004                  */
2005                 if (!DBA::isResult($fcontact)) {
2006                         // Database record did not get created. Quietly give up.
2007                         killme();
2008                 }
2009
2010                 $fid = $r[0]["id"];
2011
2012                 $hash = random_string();
2013
2014                 $r = q(
2015                         "INSERT INTO `intro` (`uid`, `fid`, `contact-id`, `note`, `hash`, `datetime`, `blocked`)
2016                         VALUES(%d, %d, %d, '%s', '%s', '%s', %d)",
2017                         intval($suggest["uid"]),
2018                         intval($fid),
2019                         intval($suggest["cid"]),
2020                         DBA::escape($suggest["body"]),
2021                         DBA::escape($hash),
2022                         DBA::escape(DateTimeFormat::utcNow()),
2023                         intval(0)
2024                 );
2025
2026                 notification(
2027                         [
2028                                 "type"         => NOTIFY_SUGGEST,
2029                                 "notify_flags" => $importer["notify-flags"],
2030                                 "language"     => $importer["language"],
2031                                 "to_name"      => $importer["username"],
2032                                 "to_email"     => $importer["email"],
2033                                 "uid"          => $importer["importer_uid"],
2034                                 "item"         => $suggest,
2035                                 "link"         => System::baseUrl()."/notifications/intros",
2036                                 "source_name"  => $importer["name"],
2037                                 "source_link"  => $importer["url"],
2038                                 "source_photo" => $importer["photo"],
2039                                 "verb"         => ACTIVITY_REQ_FRIEND,
2040                                 "otype"        => "intro"]
2041                 );
2042
2043                 return true;
2044         }
2045
2046         /**
2047          * @brief Processes the relocation elements
2048          *
2049          * @param object $xpath      XPath object
2050          * @param object $relocation relocation elements
2051          * @param array  $importer   Record of the importer user mixed with contact of the content
2052          * @return boolean
2053          * @todo Find good type-hints for all parameter
2054          */
2055         private static function processRelocation($xpath, $relocation, $importer)
2056         {
2057                 Logger::log("Processing relocations");
2058
2059                 /// @TODO Rewrite this to one statement
2060                 $relocate = [];
2061                 $relocate["uid"] = $importer["importer_uid"];
2062                 $relocate["cid"] = $importer["id"];
2063                 $relocate["url"] = $xpath->query("dfrn:url/text()", $relocation)->item(0)->nodeValue;
2064                 $relocate["addr"] = $xpath->query("dfrn:addr/text()", $relocation)->item(0)->nodeValue;
2065                 $relocate["name"] = $xpath->query("dfrn:name/text()", $relocation)->item(0)->nodeValue;
2066                 $relocate["avatar"] = $xpath->query("dfrn:avatar/text()", $relocation)->item(0)->nodeValue;
2067                 $relocate["photo"] = $xpath->query("dfrn:photo/text()", $relocation)->item(0)->nodeValue;
2068                 $relocate["thumb"] = $xpath->query("dfrn:thumb/text()", $relocation)->item(0)->nodeValue;
2069                 $relocate["micro"] = $xpath->query("dfrn:micro/text()", $relocation)->item(0)->nodeValue;
2070                 $relocate["request"] = $xpath->query("dfrn:request/text()", $relocation)->item(0)->nodeValue;
2071                 $relocate["confirm"] = $xpath->query("dfrn:confirm/text()", $relocation)->item(0)->nodeValue;
2072                 $relocate["notify"] = $xpath->query("dfrn:notify/text()", $relocation)->item(0)->nodeValue;
2073                 $relocate["poll"] = $xpath->query("dfrn:poll/text()", $relocation)->item(0)->nodeValue;
2074                 $relocate["sitepubkey"] = $xpath->query("dfrn:sitepubkey/text()", $relocation)->item(0)->nodeValue;
2075
2076                 if (($relocate["avatar"] == "") && ($relocate["photo"] != "")) {
2077                         $relocate["avatar"] = $relocate["photo"];
2078                 }
2079
2080                 if ($relocate["addr"] == "") {
2081                         $relocate["addr"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$3@$2", $relocate["url"]);
2082                 }
2083
2084                 // update contact
2085                 $r = q(
2086                         "SELECT `photo`, `url` FROM `contact` WHERE `id` = %d AND `uid` = %d",
2087                         intval($importer["id"]),
2088                         intval($importer["importer_uid"])
2089                 );
2090
2091                 if (!DBA::isResult($r)) {
2092                         Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2093                         return false;
2094                 }
2095
2096                 $old = $r[0];
2097
2098                 // Update the gcontact entry
2099                 $relocate["server_url"] = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $relocate["url"]);
2100
2101                 $fields = ['name' => $relocate["name"], 'photo' => $relocate["avatar"],
2102                         'url' => $relocate["url"], 'nurl' => normalise_link($relocate["url"]),
2103                         'addr' => $relocate["addr"], 'connect' => $relocate["addr"],
2104                         'notify' => $relocate["notify"], 'server_url' => $relocate["server_url"]];
2105                 DBA::update('gcontact', $fields, ['nurl' => normalise_link($old["url"])]);
2106
2107                 // Update the contact table. We try to find every entry.
2108                 $fields = ['name' => $relocate["name"], 'avatar' => $relocate["avatar"],
2109                         'url' => $relocate["url"], 'nurl' => normalise_link($relocate["url"]),
2110                         'addr' => $relocate["addr"], 'request' => $relocate["request"],
2111                         'confirm' => $relocate["confirm"], 'notify' => $relocate["notify"],
2112                         'poll' => $relocate["poll"], 'site-pubkey' => $relocate["sitepubkey"]];
2113                 $condition = ["(`id` = ?) OR (`nurl` = ?)", $importer["id"], normalise_link($old["url"])];
2114
2115                 DBA::update('contact', $fields, $condition);
2116
2117                 Contact::updateAvatar($relocate["avatar"], $importer["importer_uid"], $importer["id"], true);
2118
2119                 Logger::log('Contacts are updated.');
2120
2121                 /// @TODO
2122                 /// merge with current record, current contents have priority
2123                 /// update record, set url-updated
2124                 /// update profile photos
2125                 /// schedule a scan?
2126                 return true;
2127         }
2128
2129         /**
2130          * @brief Updates an item
2131          *
2132          * @param array $current   the current item record
2133          * @param array $item      the new item record
2134          * @param array $importer  Record of the importer user mixed with contact of the content
2135          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2136          * @return mixed
2137          * @todo set proper type-hints (array?)
2138          */
2139         private static function updateContent($current, $item, $importer, $entrytype)
2140         {
2141                 $changed = false;
2142
2143                 if (self::isEditedTimestampNewer($current, $item)) {
2144                         // do not accept (ignore) an earlier edit than one we currently have.
2145                         if (DateTimeFormat::utc($item["edited"]) < $current["edited"]) {
2146                                 return false;
2147                         }
2148
2149                         $fields = ['title' => defaults($item, 'title', ''), 'body' => defaults($item, 'body', ''),
2150                                         'tag' => defaults($item, 'tag', ''), 'changed' => DateTimeFormat::utcNow(),
2151                                         'edited' => DateTimeFormat::utc($item["edited"])];
2152
2153                         $condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
2154                         Item::update($fields, $condition);
2155
2156                         $changed = true;
2157                 }
2158                 return $changed;
2159         }
2160
2161         /**
2162          * @brief Detects the entry type of the item
2163          *
2164          * @param array $importer Record of the importer user mixed with contact of the content
2165          * @param array $item     the new item record
2166          *
2167          * @return int Is it a toplevel entry, a comment or a relayed comment?
2168          * @todo set proper type-hints (array?)
2169          */
2170         private static function getEntryType($importer, $item)
2171         {
2172                 if ($item["parent-uri"] != $item["uri"]) {
2173                         $community = false;
2174
2175                         if ($importer["page-flags"] == Contact::PAGE_COMMUNITY || $importer["page-flags"] == Contact::PAGE_PRVGROUP) {
2176                                 $sql_extra = "";
2177                                 $community = true;
2178                                 Logger::log("possible community action");
2179                         } else {
2180                                 $sql_extra = " AND `contact`.`self` AND `item`.`wall` ";
2181                         }
2182
2183                         // was the top-level post for this action written by somebody on this site?
2184                         // Specifically, the recipient?
2185
2186                         $is_a_remote_action = false;
2187
2188                         $parent = Item::selectFirst(['parent-uri'], ['uri' => $item["parent-uri"]]);
2189                         if (DBA::isResult($parent)) {
2190                                 $r = q(
2191                                         "SELECT `item`.`forum_mode`, `item`.`wall` FROM `item`
2192                                         INNER JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
2193                                         WHERE `item`.`uri` = '%s' AND (`item`.`parent-uri` = '%s' OR `item`.`thr-parent` = '%s')
2194                                         AND `item`.`uid` = %d
2195                                         $sql_extra
2196                                         LIMIT 1",
2197                                         DBA::escape($parent["parent-uri"]),
2198                                         DBA::escape($parent["parent-uri"]),
2199                                         DBA::escape($parent["parent-uri"]),
2200                                         intval($importer["importer_uid"])
2201                                 );
2202                                 if (DBA::isResult($r)) {
2203                                         $is_a_remote_action = true;
2204                                 }
2205                         }
2206
2207                         /*
2208                          * Does this have the characteristics of a community or private group action?
2209                          * If it's an action to a wall post on a community/prvgroup page it's a
2210                          * valid community action. Also forum_mode makes it valid for sure.
2211                          * If neither, it's not.
2212                          */
2213                         if ($is_a_remote_action && $community && (!$r[0]["forum_mode"]) && (!$r[0]["wall"])) {
2214                                 $is_a_remote_action = false;
2215                                 Logger::log("not a community action");
2216                         }
2217
2218                         if ($is_a_remote_action) {
2219                                 return DFRN::REPLY_RC;
2220                         } else {
2221                                 return DFRN::REPLY;
2222                         }
2223                 } else {
2224                         return DFRN::TOP_LEVEL;
2225                 }
2226         }
2227
2228         /**
2229          * @brief Send a "poke"
2230          *
2231          * @param array $item      the new item record
2232          * @param array $importer  Record of the importer user mixed with contact of the content
2233          * @param int   $posted_id The record number of item record that was just posted
2234          * @return void
2235          * @todo set proper type-hints (array?)
2236          */
2237         private static function doPoke($item, $importer, $posted_id)
2238         {
2239                 $verb = urldecode(substr($item["verb"], strpos($item["verb"], "#")+1));
2240                 if (!$verb) {
2241                         return;
2242                 }
2243                 $xo = XML::parseString($item["object"], false);
2244
2245                 if (($xo->type == ACTIVITY_OBJ_PERSON) && ($xo->id)) {
2246                         // somebody was poked/prodded. Was it me?
2247                         foreach ($xo->link as $l) {
2248                                 $atts = $l->attributes();
2249                                 switch ($atts["rel"]) {
2250                                         case "alternate":
2251                                                 $Blink = $atts["href"];
2252                                                 break;
2253                                         default:
2254                                                 break;
2255                                 }
2256                         }
2257
2258                         if ($Blink && link_compare($Blink, System::baseUrl() . "/profile/" . $importer["nickname"])) {
2259                                 $author = DBA::selectFirst('contact', ['name', 'thumb', 'url'], ['id' => $item['author-id']]);
2260
2261                                 $item['id'] = $posted_id;
2262
2263                                 $parent = Item::selectFirst(['id'], ['uri' => $item['parent-uri'], 'uid' => $importer["importer_uid"]]);
2264                                 $item["parent"] = $parent['id'];
2265
2266                                 // send a notification
2267                                 notification(
2268                                         [
2269                                         "type"         => NOTIFY_POKE,
2270                                         "notify_flags" => $importer["notify-flags"],
2271                                         "language"     => $importer["language"],
2272                                         "to_name"      => $importer["username"],
2273                                         "to_email"     => $importer["email"],
2274                                         "uid"          => $importer["importer_uid"],
2275                                         "item"         => $item,
2276                                         "link"         => System::baseUrl()."/display/".urlencode(Item::getGuidById($posted_id)),
2277                                         "source_name"  => $author["name"],
2278                                         "source_link"  => $author["url"],
2279                                         "source_photo" => $author["thumb"],
2280                                         "verb"         => $item["verb"],
2281                                         "otype"        => "person",
2282                                         "activity"     => $verb,
2283                                         "parent"       => $item["parent"]]
2284                                 );
2285                         }
2286                 }
2287         }
2288
2289         /**
2290          * @brief Processes several actions, depending on the verb
2291          *
2292          * @param int   $entrytype Is it a toplevel entry, a comment or a relayed comment?
2293          * @param array $importer  Record of the importer user mixed with contact of the content
2294          * @param array $item      the new item record
2295          * @param bool  $is_like   Is the verb a "like"?
2296          *
2297          * @return bool Should the processing of the entries be continued?
2298          * @todo set proper type-hints (array?)
2299          */
2300         private static function processVerbs($entrytype, $importer, &$item, &$is_like)
2301         {
2302                 Logger::log("Process verb ".$item["verb"]." and object-type ".$item["object-type"]." for entrytype ".$entrytype, Logger::DEBUG);
2303
2304                 if (($entrytype == DFRN::TOP_LEVEL)) {
2305                         // The filling of the the "contact" variable is done for legcy reasons
2306                         // The functions below are partly used by ostatus.php as well - where we have this variable
2307                         $r = q("SELECT * FROM `contact` WHERE `id` = %d", intval($importer["id"]));
2308                         $contact = $r[0];
2309                         $nickname = $contact["nick"];
2310
2311                         // Big question: Do we need these functions? They were part of the "consume_feed" function.
2312                         // This function once was responsible for DFRN and OStatus.
2313                         if (activity_match($item["verb"], ACTIVITY_FOLLOW)) {
2314                                 Logger::log("New follower");
2315                                 Contact::addRelationship($importer, $contact, $item, $nickname);
2316                                 return false;
2317                         }
2318                         if (activity_match($item["verb"], ACTIVITY_UNFOLLOW)) {
2319                                 Logger::log("Lost follower");
2320                                 Contact::removeFollower($importer, $contact, $item);
2321                                 return false;
2322                         }
2323                         if (activity_match($item["verb"], ACTIVITY_REQ_FRIEND)) {
2324                                 Logger::log("New friend request");
2325                                 Contact::addRelationship($importer, $contact, $item, $nickname, true);
2326                                 return false;
2327                         }
2328                         if (activity_match($item["verb"], ACTIVITY_UNFRIEND)) {
2329                                 Logger::log("Lost sharer");
2330                                 Contact::removeSharer($importer, $contact, $item);
2331                                 return false;
2332                         }
2333                 } else {
2334                         if (($item["verb"] == ACTIVITY_LIKE)
2335                                 || ($item["verb"] == ACTIVITY_DISLIKE)
2336                                 || ($item["verb"] == ACTIVITY_ATTEND)
2337                                 || ($item["verb"] == ACTIVITY_ATTENDNO)
2338                                 || ($item["verb"] == ACTIVITY_ATTENDMAYBE)
2339                         ) {
2340                                 $is_like = true;
2341                                 $item["gravity"] = GRAVITY_ACTIVITY;
2342                                 // only one like or dislike per person
2343                                 // splitted into two queries for performance issues
2344                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2345                                         'verb' => $item["verb"], 'parent-uri' => $item["parent-uri"]];
2346                                 if (Item::exists($condition)) {
2347                                         return false;
2348                                 }
2349
2350                                 $condition = ['uid' => $item["uid"], 'author-id' => $item["author-id"], 'gravity' => GRAVITY_ACTIVITY,
2351                                         'verb' => $item["verb"], 'thr-parent' => $item["parent-uri"]];
2352                                 if (Item::exists($condition)) {
2353                                         return false;
2354                                 }
2355
2356                                 // The owner of an activity must be the author
2357                                 $item["owner-name"] = $item["author-name"];
2358                                 $item["owner-link"] = $item["author-link"];
2359                                 $item["owner-avatar"] = $item["author-avatar"];
2360                                 $item["owner-id"] = $item["author-id"];
2361                         } else {
2362                                 $is_like = false;
2363                         }
2364
2365                         if (($item["verb"] == ACTIVITY_TAG) && ($item["object-type"] == ACTIVITY_OBJ_TAGTERM)) {
2366                                 $xo = XML::parseString($item["object"], false);
2367                                 $xt = XML::parseString($item["target"], false);
2368
2369                                 if ($xt->type == ACTIVITY_OBJ_NOTE) {
2370                                         $item_tag = Item::selectFirst(['id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
2371
2372                                         if (!DBA::isResult($item_tag)) {
2373                                                 Logger::log("Query failed to execute, no result returned in " . __FUNCTION__);
2374                                                 return false;
2375                                         }
2376
2377                                         // extract tag, if not duplicate, add to parent item
2378                                         if ($xo->content) {
2379                                                 if (!stristr($item_tag["tag"], trim($xo->content))) {
2380                                                         $tag = $item_tag["tag"] . (strlen($item_tag["tag"]) ? ',' : '') . '#[url=' . $xo->id . ']'. $xo->content . '[/url]';
2381                                                         Item::update(['tag' => $tag], ['id' => $item_tag["id"]]);
2382                                                 }
2383                                         }
2384                                 }
2385                         }
2386                 }
2387                 return true;
2388         }
2389
2390         /**
2391          * @brief Processes the link elements
2392          *
2393          * @param object $links link elements
2394          * @param array  $item  the item record
2395          * @return void
2396          * @todo set proper type-hints
2397          */
2398         private static function parseLinks($links, &$item)
2399         {
2400                 $rel = "";
2401                 $href = "";
2402                 $type = "";
2403                 $length = "0";
2404                 $title = "";
2405                 foreach ($links as $link) {
2406                         foreach ($link->attributes as $attributes) {
2407                                 switch ($attributes->name) {
2408                                         case "href"  : $href   = $attributes->textContent; break;
2409                                         case "rel"   : $rel    = $attributes->textContent; break;
2410                                         case "type"  : $type   = $attributes->textContent; break;
2411                                         case "length": $length = $attributes->textContent; break;
2412                                         case "title" : $title  = $attributes->textContent; break;
2413                                 }
2414                         }
2415                         if (($rel != "") && ($href != "")) {
2416                                 switch ($rel) {
2417                                         case "alternate":
2418                                                 $item["plink"] = $href;
2419                                                 break;
2420                                         case "enclosure":
2421                                                 $enclosure = $href;
2422
2423                                                 if (!empty($item["attach"])) {
2424                                                         $item["attach"] .= ",";
2425                                                 } else {
2426                                                         $item["attach"] = "";
2427                                                 }
2428
2429                                                 $item["attach"] .= '[attach]href="' . $href . '" length="' . $length . '" type="' . $type . '" title="' . $title . '"[/attach]';
2430                                                 break;
2431                                 }
2432                         }
2433                 }
2434         }
2435
2436         /**
2437          * @brief Processes the entry elements which contain the items and comments
2438          *
2439          * @param array  $header   Array of the header elements that always stay the same
2440          * @param object $xpath    XPath object
2441          * @param object $entry    entry elements
2442          * @param array  $importer Record of the importer user mixed with contact of the content
2443          * @param object $xml      xml
2444          * @return void
2445          * @todo Add type-hints
2446          */
2447         private static function processEntry($header, $xpath, $entry, $importer, $xml)
2448         {
2449                 Logger::log("Processing entries");
2450
2451                 $item = $header;
2452
2453                 $item["protocol"] = Conversation::PARCEL_DFRN;
2454
2455                 $item["source"] = $xml;
2456
2457                 // Get the uri
2458                 $item["uri"] = XML::getFirstNodeValue($xpath, "atom:id/text()", $entry);
2459
2460                 $item["edited"] = XML::getFirstNodeValue($xpath, "atom:updated/text()", $entry);
2461
2462                 $current = Item::selectFirst(['id', 'uid', 'edited', 'body'],
2463                         ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]]
2464                 );
2465                 // Is there an existing item?
2466                 if (DBA::isResult($current) && !self::isEditedTimestampNewer($current, $item)) {
2467                         Logger::log("Item ".$item["uri"]." (".$item['edited'].") already existed.", Logger::DEBUG);
2468                         return;
2469                 }
2470
2471                 // Fetch the owner
2472                 $owner = self::fetchauthor($xpath, $entry, $importer, "dfrn:owner", true, $xml);
2473
2474                 $owner_unknown = (isset($owner["contact-unknown"]) && $owner["contact-unknown"]);
2475
2476                 $item["owner-name"] = $owner["name"];
2477                 $item["owner-link"] = $owner["link"];
2478                 $item["owner-avatar"] = $owner["avatar"];
2479                 $item["owner-id"] = Contact::getIdForURL($owner["link"], 0);
2480
2481                 // fetch the author
2482                 $author = self::fetchauthor($xpath, $entry, $importer, "atom:author", true, $xml);
2483
2484                 $item["author-name"] = $author["name"];
2485                 $item["author-link"] = $author["link"];
2486                 $item["author-avatar"] = $author["avatar"];
2487                 $item["author-id"] = Contact::getIdForURL($author["link"], 0);
2488
2489                 $item["title"] = XML::getFirstNodeValue($xpath, "atom:title/text()", $entry);
2490
2491                 $item["created"] = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2492
2493                 $item["body"] = XML::getFirstNodeValue($xpath, "dfrn:env/text()", $entry);
2494                 $item["body"] = str_replace([' ',"\t","\r","\n"], ['','','',''], $item["body"]);
2495                 // make sure nobody is trying to sneak some html tags by us
2496                 $item["body"] = notags(base64url_decode($item["body"]));
2497
2498                 $item["body"] = BBCode::limitBodySize($item["body"]);
2499
2500                 /// @todo Do we really need this check for HTML elements? (It was copied from the old function)
2501                 if ((strpos($item['body'], '<') !== false) && (strpos($item['body'], '>') !== false)) {
2502                         $base_url = get_app()->getBaseURL();
2503                         $item['body'] = reltoabs($item['body'], $base_url);
2504
2505                         $item['body'] = html2bb_video($item['body']);
2506
2507                         $item['body'] = OEmbed::HTML2BBCode($item['body']);
2508
2509                         $config = HTMLPurifier_Config::createDefault();
2510                         $config->set('Cache.DefinitionImpl', null);
2511
2512                         // we shouldn't need a whitelist, because the bbcode converter
2513                         // will strip out any unsupported tags.
2514
2515                         $purifier = new HTMLPurifier($config);
2516                         $item['body'] = $purifier->purify($item['body']);
2517
2518                         $item['body'] = @HTML::toBBCode($item['body']);
2519                 }
2520
2521                 /// @todo We should check for a repeated post and if we know the repeated author.
2522
2523                 // We don't need the content element since "dfrn:env" is always present
2524                 //$item["body"] = $xpath->query("atom:content/text()", $entry)->item(0)->nodeValue;
2525
2526                 $item["location"] = XML::getFirstNodeValue($xpath, "dfrn:location/text()", $entry);
2527
2528                 $item["coord"] = XML::getFirstNodeValue($xpath, "georss:point", $entry);
2529
2530                 $item["private"] = XML::getFirstNodeValue($xpath, "dfrn:private/text()", $entry);
2531
2532                 $item["extid"] = XML::getFirstNodeValue($xpath, "dfrn:extid/text()", $entry);
2533
2534                 if (XML::getFirstNodeValue($xpath, "dfrn:bookmark/text()", $entry) == "true") {
2535                         $item["post-type"] = Item::PT_PAGE;
2536                 }
2537
2538                 $notice_info = $xpath->query("statusnet:notice_info", $entry);
2539                 if ($notice_info && ($notice_info->length > 0)) {
2540                         foreach ($notice_info->item(0)->attributes as $attributes) {
2541                                 if ($attributes->name == "source") {
2542                                         $item["app"] = strip_tags($attributes->textContent);
2543                                 }
2544                         }
2545                 }
2546
2547                 $item["guid"] = XML::getFirstNodeValue($xpath, "dfrn:diaspora_guid/text()", $entry);
2548
2549                 // We store the data from "dfrn:diaspora_signature" in a different table, this is done in "Item::insert"
2550                 $dsprsig = XML::unxmlify(XML::getFirstNodeValue($xpath, "dfrn:diaspora_signature/text()", $entry));
2551                 if ($dsprsig != "") {
2552                         $item["dsprsig"] = $dsprsig;
2553                 }
2554
2555                 $item["verb"] = XML::getFirstNodeValue($xpath, "activity:verb/text()", $entry);
2556
2557                 if (XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry) != "") {
2558                         $item["object-type"] = XML::getFirstNodeValue($xpath, "activity:object-type/text()", $entry);
2559                 }
2560
2561                 $object = $xpath->query("activity:object", $entry)->item(0);
2562                 $item["object"] = self::transformActivity($xpath, $object, "object");
2563
2564                 if (trim($item["object"]) != "") {
2565                         $r = XML::parseString($item["object"], false);
2566                         if (isset($r->type)) {
2567                                 $item["object-type"] = $r->type;
2568                         }
2569                 }
2570
2571                 $target = $xpath->query("activity:target", $entry)->item(0);
2572                 $item["target"] = self::transformActivity($xpath, $target, "target");
2573
2574                 $categories = $xpath->query("atom:category", $entry);
2575                 if ($categories) {
2576                         foreach ($categories as $category) {
2577                                 $term = "";
2578                                 $scheme = "";
2579                                 foreach ($category->attributes as $attributes) {
2580                                         if ($attributes->name == "term") {
2581                                                 $term = $attributes->textContent;
2582                                         }
2583
2584                                         if ($attributes->name == "scheme") {
2585                                                 $scheme = $attributes->textContent;
2586                                         }
2587                                 }
2588
2589                                 if (($term != "") && ($scheme != "")) {
2590                                         $parts = explode(":", $scheme);
2591                                         if ((count($parts) >= 4) && (array_shift($parts) == "X-DFRN")) {
2592                                                 $termhash = array_shift($parts);
2593                                                 $termurl = implode(":", $parts);
2594
2595                                                 if (!empty($item["tag"])) {
2596                                                         $item["tag"] .= ",";
2597                                                 } else {
2598                                                         $item["tag"] = "";
2599                                                 }
2600
2601                                                 $item["tag"] .= $termhash . "[url=" . $termurl . "]" . $term . "[/url]";
2602                                         }
2603                                 }
2604                         }
2605                 }
2606
2607                 $enclosure = "";
2608
2609                 $links = $xpath->query("atom:link", $entry);
2610                 if ($links) {
2611                         self::parseLinks($links, $item);
2612                 }
2613
2614                 $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
2615
2616                 $conv = $xpath->query('ostatus:conversation', $entry);
2617                 if (is_object($conv->item(0))) {
2618                         foreach ($conv->item(0)->attributes as $attributes) {
2619                                 if ($attributes->name == "ref") {
2620                                         $item['conversation-uri'] = $attributes->textContent;
2621                                 }
2622                                 if ($attributes->name == "href") {
2623                                         $item['conversation-href'] = $attributes->textContent;
2624                                 }
2625                         }
2626                 }
2627
2628                 // Is it a reply or a top level posting?
2629                 $item["parent-uri"] = $item["uri"];
2630
2631                 $inreplyto = $xpath->query("thr:in-reply-to", $entry);
2632                 if (is_object($inreplyto->item(0))) {
2633                         foreach ($inreplyto->item(0)->attributes as $attributes) {
2634                                 if ($attributes->name == "ref") {
2635                                         $item["parent-uri"] = $attributes->textContent;
2636                                 }
2637                         }
2638                 }
2639
2640                 // Get the type of the item (Top level post, reply or remote reply)
2641                 $entrytype = self::getEntryType($importer, $item);
2642
2643                 // Now assign the rest of the values that depend on the type of the message
2644                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2645                         if (!isset($item["object-type"])) {
2646                                 $item["object-type"] = ACTIVITY_OBJ_COMMENT;
2647                         }
2648
2649                         if ($item["contact-id"] != $owner["contact-id"]) {
2650                                 $item["contact-id"] = $owner["contact-id"];
2651                         }
2652
2653                         if (($item["network"] != $owner["network"]) && ($owner["network"] != "")) {
2654                                 $item["network"] = $owner["network"];
2655                         }
2656
2657                         if ($item["contact-id"] != $author["contact-id"]) {
2658                                 $item["contact-id"] = $author["contact-id"];
2659                         }
2660
2661                         if (($item["network"] != $author["network"]) && ($author["network"] != "")) {
2662                                 $item["network"] = $author["network"];
2663                         }
2664                 }
2665
2666                 if ($entrytype == DFRN::REPLY_RC) {
2667                         $item["wall"] = 1;
2668                 } elseif ($entrytype == DFRN::TOP_LEVEL) {
2669                         if (!isset($item["object-type"])) {
2670                                 $item["object-type"] = ACTIVITY_OBJ_NOTE;
2671                         }
2672
2673                         // Is it an event?
2674                         if (($item["object-type"] == ACTIVITY_OBJ_EVENT) && !$owner_unknown) {
2675                                 Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
2676                                 $ev = Event::fromBBCode($item["body"]);
2677                                 if ((x($ev, "desc") || x($ev, "summary")) && x($ev, "start")) {
2678                                         Logger::log("Event in item ".$item["uri"]." was found.", Logger::DEBUG);
2679                                         $ev["cid"]     = $importer["id"];
2680                                         $ev["uid"]     = $importer["importer_uid"];
2681                                         $ev["uri"]     = $item["uri"];
2682                                         $ev["edited"]  = $item["edited"];
2683                                         $ev["private"] = $item["private"];
2684                                         $ev["guid"]    = $item["guid"];
2685                                         $ev["plink"]   = $item["plink"];
2686
2687                                         $condition = ['uri' => $item["uri"], 'uid' => $importer["importer_uid"]];
2688                                         $event = DBA::selectFirst('event', ['id'], $condition);
2689                                         if (DBA::isResult($event)) {
2690                                                 $ev["id"] = $event["id"];
2691                                         }
2692
2693                                         $event_id = Event::store($ev);
2694                                         Logger::log("Event ".$event_id." was stored", Logger::DEBUG);
2695                                         return;
2696                                 }
2697                         }
2698                 }
2699
2700                 if (!self::processVerbs($entrytype, $importer, $item, $is_like)) {
2701                         Logger::log("Exiting because 'processVerbs' told us so", Logger::DEBUG);
2702                         return;
2703                 }
2704
2705                 // This check is done here to be able to receive connection requests in "processVerbs"
2706                 if (($entrytype == DFRN::TOP_LEVEL) && $owner_unknown) {
2707                         Logger::log("Item won't be stored because user " . $importer["importer_uid"] . " doesn't follow " . $item["owner-link"] . ".", Logger::DEBUG);
2708                         return;
2709                 }
2710
2711
2712                 // Update content if 'updated' changes
2713                 if (DBA::isResult($current)) {
2714                         if (self::updateContent($current, $item, $importer, $entrytype)) {
2715                                 Logger::log("Item ".$item["uri"]." was updated.", Logger::DEBUG);
2716                         } else {
2717                                 Logger::log("Item " . $item["uri"] . " already existed.", Logger::DEBUG);
2718                         }
2719                         return;
2720                 }
2721
2722                 if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
2723                         $posted_id = Item::insert($item);
2724                         $parent = 0;
2725
2726                         if ($posted_id) {
2727                                 Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
2728
2729                                 if ($item['uid'] == 0) {
2730                                         Item::distribute($posted_id);
2731                                 }
2732
2733                                 return true;
2734                         }
2735                 } else { // $entrytype == DFRN::TOP_LEVEL
2736                         if (($importer["uid"] == 0) && ($importer["importer_uid"] != 0)) {
2737                                 Logger::log("Contact ".$importer["id"]." isn't known to user ".$importer["importer_uid"].". The post will be ignored.", Logger::DEBUG);
2738                                 return;
2739                         }
2740                         if (!link_compare($item["owner-link"], $importer["url"])) {
2741                                 /*
2742                                  * The item owner info is not our contact. It's OK and is to be expected if this is a tgroup delivery,
2743                                  * but otherwise there's a possible data mixup on the sender's system.
2744                                  * the tgroup delivery code called from Item::insert will correct it if it's a forum,
2745                                  * but we're going to unconditionally correct it here so that the post will always be owned by our contact.
2746                                  */
2747                                 Logger::log('Correcting item owner.', Logger::DEBUG);
2748                                 $item["owner-link"] = $importer["url"];
2749                                 $item["owner-id"] = Contact::getIdForURL($importer["url"], 0);
2750                         }
2751
2752                         if (($importer["rel"] == Contact::FOLLOWER) && (!self::tgroupCheck($importer["importer_uid"], $item))) {
2753                                 Logger::log("Contact ".$importer["id"]." is only follower and tgroup check was negative.", Logger::DEBUG);
2754                                 return;
2755                         }
2756
2757                         // This is my contact on another system, but it's really me.
2758                         // Turn this into a wall post.
2759                         $notify = Item::isRemoteSelf($importer, $item);
2760
2761                         $posted_id = Item::insert($item, false, $notify);
2762
2763                         if ($notify) {
2764                                 $posted_id = $notify;
2765                         }
2766
2767                         Logger::log("Item was stored with id ".$posted_id, Logger::DEBUG);
2768
2769                         if ($item['uid'] == 0) {
2770                                 Item::distribute($posted_id);
2771                         }
2772
2773                         if (stristr($item["verb"], ACTIVITY_POKE)) {
2774                                 self::doPoke($item, $importer, $posted_id);
2775                         }
2776                 }
2777         }
2778
2779         /**
2780          * @brief Deletes items
2781          *
2782          * @param object $xpath    XPath object
2783          * @param object $deletion deletion elements
2784          * @param array  $importer Record of the importer user mixed with contact of the content
2785          * @return void
2786          * @todo set proper type-hints
2787          */
2788         private static function processDeletion($xpath, $deletion, $importer)
2789         {
2790                 Logger::log("Processing deletions");
2791                 $uri = null;
2792
2793                 foreach ($deletion->attributes as $attributes) {
2794                         if ($attributes->name == "ref") {
2795                                 $uri = $attributes->textContent;
2796                         }
2797                 }
2798
2799                 if (!$uri || !$importer["id"]) {
2800                         return false;
2801                 }
2802
2803                 $condition = ['uri' => $uri, 'uid' => $importer["importer_uid"]];
2804                 $item = Item::selectFirst(['id', 'parent', 'contact-id', 'file', 'deleted'], $condition);
2805                 if (!DBA::isResult($item)) {
2806                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " wasn't found.", Logger::DEBUG);
2807                         return;
2808                 }
2809
2810                 if (strstr($item['file'], '[')) {
2811                         Logger::log("Item with uri " . $uri . " for user " . $importer["importer_uid"] . " is filed. So it won't be deleted.", Logger::DEBUG);
2812                         return;
2813                 }
2814
2815                 // When it is a starting post it has to belong to the person that wants to delete it
2816                 if (($item['id'] == $item['parent']) && ($item['contact-id'] != $importer["id"])) {
2817                         Logger::log("Item with uri " . $uri . " don't belong to contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2818                         return;
2819                 }
2820
2821                 // Comments can be deleted by the thread owner or comment owner
2822                 if (($item['id'] != $item['parent']) && ($item['contact-id'] != $importer["id"])) {
2823                         $condition = ['id' => $item['parent'], 'contact-id' => $importer["id"]];
2824                         if (!Item::exists($condition)) {
2825                                 Logger::log("Item with uri " . $uri . " wasn't found or mustn't be deleted by contact " . $importer["id"] . " - ignoring deletion.", Logger::DEBUG);
2826                                 return;
2827                         }
2828                 }
2829
2830                 if ($item["deleted"]) {
2831                         return;
2832                 }
2833
2834                 Logger::log('deleting item '.$item['id'].' uri='.$uri, Logger::DEBUG);
2835
2836                 Item::delete(['id' => $item['id']]);
2837         }
2838
2839         /**
2840          * @brief Imports a DFRN message
2841          *
2842          * @param string $xml          The DFRN message
2843          * @param array  $importer     Record of the importer user mixed with contact of the content
2844          * @param bool   $sort_by_date Is used when feeds are polled
2845          * @return integer Import status
2846          * @todo set proper type-hints
2847          */
2848         public static function import($xml, $importer, $sort_by_date = false)
2849         {
2850                 if ($xml == "") {
2851                         return 400;
2852                 }
2853
2854                 $doc = new DOMDocument();
2855                 @$doc->loadXML($xml);
2856
2857                 $xpath = new DOMXPath($doc);
2858                 $xpath->registerNamespace("atom", NAMESPACE_ATOM1);
2859                 $xpath->registerNamespace("thr", NAMESPACE_THREAD);
2860                 $xpath->registerNamespace("at", NAMESPACE_TOMB);
2861                 $xpath->registerNamespace("media", NAMESPACE_MEDIA);
2862                 $xpath->registerNamespace("dfrn", NAMESPACE_DFRN);
2863                 $xpath->registerNamespace("activity", NAMESPACE_ACTIVITY);
2864                 $xpath->registerNamespace("georss", NAMESPACE_GEORSS);
2865                 $xpath->registerNamespace("poco", NAMESPACE_POCO);
2866                 $xpath->registerNamespace("ostatus", NAMESPACE_OSTATUS);
2867                 $xpath->registerNamespace("statusnet", NAMESPACE_STATUSNET);
2868
2869                 $header = [];
2870                 $header["uid"] = $importer["importer_uid"];
2871                 $header["network"] = Protocol::DFRN;
2872                 $header["wall"] = 0;
2873                 $header["origin"] = 0;
2874                 $header["contact-id"] = $importer["id"];
2875
2876                 // Update the contact table if the data has changed
2877
2878                 // The "atom:author" is only present in feeds
2879                 if ($xpath->query("/atom:feed/atom:author")->length > 0) {
2880                         self::fetchauthor($xpath, $doc->firstChild, $importer, "atom:author", false, $xml);
2881                 }
2882
2883                 // Only the "dfrn:owner" in the head section contains all data
2884                 if ($xpath->query("/atom:feed/dfrn:owner")->length > 0) {
2885                         self::fetchauthor($xpath, $doc->firstChild, $importer, "dfrn:owner", false, $xml);
2886                 }
2887
2888                 Logger::log("Import DFRN message for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2889
2890                 // is it a public forum? Private forums aren't exposed with this method
2891                 $forum = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:community/text()"));
2892
2893                 // The account type is new since 3.5.1
2894                 if ($xpath->query("/atom:feed/dfrn:account_type")->length > 0) {
2895                         $accounttype = intval(XML::getFirstNodeValue($xpath, "/atom:feed/dfrn:account_type/text()"));
2896
2897                         if ($accounttype != $importer["contact-type"]) {
2898                                 DBA::update('contact', ['contact-type' => $accounttype], ['id' => $importer["id"]]);
2899                         }
2900                         // A forum contact can either have set "forum" or "prv" - but not both
2901                         if (($accounttype == Contact::ACCOUNT_TYPE_COMMUNITY) && (($forum != $importer["forum"]) || ($forum == $importer["prv"]))) {
2902                                 $condition = ['(`forum` != ? OR `prv` != ?) AND `id` = ?', $forum, !$forum, $importer["id"]];
2903                                 DBA::update('contact', ['forum' => $forum, 'prv' => !$forum], $condition);
2904                         }
2905                 } elseif ($forum != $importer["forum"]) { // Deprecated since 3.5.1
2906                         $condition = ['`forum` != ? AND `id` = ?', $forum, $importer["id"]];
2907                         DBA::update('contact', ['forum' => $forum], $condition);
2908                 }
2909
2910
2911                 // We are processing relocations even if we are ignoring a contact
2912                 $relocations = $xpath->query("/atom:feed/dfrn:relocate");
2913                 foreach ($relocations as $relocation) {
2914                         self::processRelocation($xpath, $relocation, $importer);
2915                 }
2916
2917                 if (($importer["uid"] != 0) && !$importer["readonly"]) {
2918                         $mails = $xpath->query("/atom:feed/dfrn:mail");
2919                         foreach ($mails as $mail) {
2920                                 self::processMail($xpath, $mail, $importer);
2921                         }
2922
2923                         $suggestions = $xpath->query("/atom:feed/dfrn:suggest");
2924                         foreach ($suggestions as $suggestion) {
2925                                 self::processSuggestion($xpath, $suggestion, $importer);
2926                         }
2927                 }
2928
2929                 $deletions = $xpath->query("/atom:feed/at:deleted-entry");
2930                 foreach ($deletions as $deletion) {
2931                         self::processDeletion($xpath, $deletion, $importer);
2932                 }
2933
2934                 if (!$sort_by_date) {
2935                         $entries = $xpath->query("/atom:feed/atom:entry");
2936                         foreach ($entries as $entry) {
2937                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2938                         }
2939                 } else {
2940                         $newentries = [];
2941                         $entries = $xpath->query("/atom:feed/atom:entry");
2942                         foreach ($entries as $entry) {
2943                                 $created = XML::getFirstNodeValue($xpath, "atom:published/text()", $entry);
2944                                 $newentries[strtotime($created)] = $entry;
2945                         }
2946
2947                         // Now sort after the publishing date
2948                         ksort($newentries);
2949
2950                         foreach ($newentries as $entry) {
2951                                 self::processEntry($header, $xpath, $entry, $importer, $xml);
2952                         }
2953                 }
2954                 Logger::log("Import done for user " . $importer["importer_uid"] . " from contact " . $importer["id"], Logger::DEBUG);
2955                 return 200;
2956         }
2957
2958         /**
2959          * @param App    $a            App
2960          * @param string $contact_nick contact nickname
2961          */
2962         public static function autoRedir(App $a, $contact_nick)
2963         {
2964                 // prevent looping
2965                 if (x($_REQUEST, 'redir') && intval($_REQUEST['redir'])) {
2966                         return;
2967                 }
2968
2969                 if ((! $contact_nick) || ($contact_nick === $a->user['nickname'])) {
2970                         return;
2971                 }
2972
2973                 if (local_user()) {
2974                         // We need to find out if $contact_nick is a user on this hub, and if so, if I
2975                         // am a contact of that user. However, that user may have other contacts with the
2976                         // same nickname as me on other hubs or other networks. Exclude these by requiring
2977                         // that the contact have a local URL. I will be the only person with my nickname at
2978                         // this URL, so if a result is found, then I am a contact of the $contact_nick user.
2979                         //
2980                         // We also have to make sure that I'm a legitimate contact--I'm not blocked or pending.
2981
2982                         $baseurl = System::baseUrl();
2983                         $domain_st = strpos($baseurl, "://");
2984                         if ($domain_st === false) {
2985                                 return;
2986                         }
2987                         $baseurl = substr($baseurl, $domain_st + 3);
2988                         $nurl = normalise_link($baseurl);
2989
2990                         /// @todo Why is there a query for "url" *and* "nurl"? Especially this normalising is strange.
2991                         $r = q("SELECT `id` FROM `contact` WHERE `uid` = (SELECT `uid` FROM `user` WHERE `nickname` = '%s' LIMIT 1)
2992                                         AND `nick` = '%s' AND NOT `self` AND (`url` LIKE '%%%s%%' OR `nurl` LIKE '%%%s%%') AND NOT `blocked` AND NOT `pending` LIMIT 1",
2993                                 DBA::escape($contact_nick),
2994                                 DBA::escape($a->user['nickname']),
2995                                 DBA::escape($baseurl),
2996                                 DBA::escape($nurl)
2997                         );
2998                         if ((! DBA::isResult($r)) || $r[0]['id'] == remote_user()) {
2999                                 return;
3000                         }
3001
3002                         $r = q("SELECT * FROM contact WHERE nick = '%s'
3003                                         AND network = '%s' AND uid = %d  AND url LIKE '%%%s%%' LIMIT 1",
3004                                 DBA::escape($contact_nick),
3005                                 DBA::escape(Protocol::DFRN),
3006                                 intval(local_user()),
3007                                 DBA::escape($baseurl)
3008                         );
3009                         if (! DBA::isResult($r)) {
3010                                 return;
3011                         }
3012
3013                         $cid = $r[0]['id'];
3014
3015                         $dfrn_id = (($r[0]['issued-id']) ? $r[0]['issued-id'] : $r[0]['dfrn-id']);
3016
3017                         if ($r[0]['duplex'] && $r[0]['issued-id']) {
3018                                 $orig_id = $r[0]['issued-id'];
3019                                 $dfrn_id = '1:' . $orig_id;
3020                         }
3021                         if ($r[0]['duplex'] && $r[0]['dfrn-id']) {
3022                                 $orig_id = $r[0]['dfrn-id'];
3023                                 $dfrn_id = '0:' . $orig_id;
3024                         }
3025
3026                         // ensure that we've got a valid ID. There may be some edge cases with forums and non-duplex mode
3027                         // that may have triggered some of the "went to {profile/intro} and got an RSS feed" issues
3028
3029                         if (strlen($dfrn_id) < 3) {
3030                                 return;
3031                         }
3032
3033                         $sec = random_string();
3034
3035                         DBA::insert('profile_check', ['uid' => local_user(), 'cid' => $cid, 'dfrn_id' => $dfrn_id, 'sec' => $sec, 'expire' => time() + 45]);
3036
3037                         $url = curPageURL();
3038
3039                         Logger::log('auto_redir: ' . $r[0]['name'] . ' ' . $sec, Logger::DEBUG);
3040                         $dest = (($url) ? '&destination_url=' . $url : '');
3041                         System::externalRedirect($r[0]['poll'] . '?dfrn_id=' . $dfrn_id
3042                                 . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile&sec=' . $sec . $dest);
3043                 }
3044
3045                 return;
3046         }
3047
3048         /**
3049          * @brief Returns the activity verb
3050          *
3051          * @param array $item Item array
3052          *
3053          * @return string activity verb
3054          */
3055         private static function constructVerb(array $item)
3056         {
3057                 if ($item['verb']) {
3058                         return $item['verb'];
3059                 }
3060                 return ACTIVITY_POST;
3061         }
3062
3063         private static function tgroupCheck($uid, $item)
3064         {
3065                 $mention = false;
3066
3067                 // check that the message originated elsewhere and is a top-level post
3068
3069                 if ($item['wall'] || $item['origin'] || ($item['uri'] != $item['parent-uri'])) {
3070                         return false;
3071                 }
3072
3073                 $user = DBA::selectFirst('user', ['page-flags', 'nickname'], ['uid' => $uid]);
3074                 if (!DBA::isResult($user)) {
3075                         return false;
3076                 }
3077
3078                 $community_page = ($user['page-flags'] == Contact::PAGE_COMMUNITY);
3079                 $prvgroup = ($user['page-flags'] == Contact::PAGE_PRVGROUP);
3080
3081                 $link = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
3082
3083                 /*
3084                  * Diaspora uses their own hardwired link URL in @-tags
3085                  * instead of the one we supply with webfinger
3086                  */
3087                 $dlink = normalise_link(System::baseUrl() . '/u/' . $user['nickname']);
3088
3089                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
3090                 if ($cnt) {
3091                         foreach ($matches as $mtch) {
3092                                 if (link_compare($link, $mtch[1]) || link_compare($dlink, $mtch[1])) {
3093                                         $mention = true;
3094                                         Logger::log('mention found: ' . $mtch[2]);
3095                                 }
3096                         }
3097                 }
3098
3099                 if (!$mention) {
3100                         return false;
3101                 }
3102
3103                 return $community_page || $prvgroup;
3104         }
3105
3106         /**
3107          * This function returns true if $update has an edited timestamp newer
3108          * than $existing, i.e. $update contains new data which should override
3109          * what's already there.  If there is no timestamp yet, the update is
3110          * assumed to be newer.  If the update has no timestamp, the existing
3111          * item is assumed to be up-to-date.  If the timestamps are equal it
3112          * assumes the update has been seen before and should be ignored.
3113          *
3114          */
3115         private static function isEditedTimestampNewer($existing, $update)
3116         {
3117                 if (!x($existing, 'edited') || !$existing['edited']) {
3118                         return true;
3119                 }
3120                 if (!x($update, 'edited') || !$update['edited']) {
3121                         return false;
3122                 }
3123
3124                 $existing_edited = DateTimeFormat::utc($existing['edited']);
3125                 $update_edited = DateTimeFormat::utc($update['edited']);
3126
3127                 return (strcmp($existing_edited, $update_edited) < 0);
3128         }
3129 }