mod/dfrn_poll.php

   1 <?php
   2
   3 /**
   4  * @file mod/dfrn_poll.php
   5  */
   6
   7 use Friendica\App;
   8 use Friendica\Core\Config;
   9 use Friendica\Core\L10n;
  10 use Friendica\Core\Logger;
  11 use Friendica\Core\System;
  12 use Friendica\Database\DBA;
  13 use Friendica\Module\Login;
  14 use Friendica\Protocol\DFRN;
  15 use Friendica\Protocol\OStatus;
  16 use Friendica\Util\Network;
  17 use Friendica\Util\XML;
  18
  19 require_once 'include/items.php';
  20
  21 function dfrn_poll_init(App $a)
  22 {
  23         Login::sessionAuth();
  24
  25         $dfrn_id         = defaults($_GET, 'dfrn_id'        , '');
  26         $type            = defaults($_GET, 'type'           , 'data');
  27         $last_update     = defaults($_GET, 'last_update'    , '');
  28         $destination_url = defaults($_GET, 'destination_url', '');
  29         $challenge       = defaults($_GET, 'challenge'      , '');
  30         $sec             = defaults($_GET, 'sec'            , '');
  31         $dfrn_version    = (float) defaults($_GET, 'dfrn_version'   , 2.0);
  32         $perm            = defaults($_GET, 'perm'           , 'r');
  33         $quiet                   = x($_GET, 'quiet');
  34
  35         // Possibly it is an OStatus compatible server that requests a user feed
  36         $user_agent = defaults($_SERVER, 'HTTP_USER_AGENT', '');
  37         if (($a->argc > 1) && ($dfrn_id == '') && !strstr($user_agent, 'Friendica')) {
  38                 $nickname = $a->argv[1];
  39                 header("Content-type: application/atom+xml");
  40                 echo OStatus::feed($nickname, $last_update, 10);
  41                 killme();
  42         }
  43
  44         $direction = -1;
  45
  46         if (strpos($dfrn_id, ':') == 1) {
  47                 $direction = intval(substr($dfrn_id, 0, 1));
  48                 $dfrn_id = substr($dfrn_id, 2);
  49         }
  50
  51         $hidewall = false;
  52
  53         if (($dfrn_id === '') && (!x($_POST, 'dfrn_id'))) {
  54                 if (Config::get('system', 'block_public') && !local_user() && !remote_user()) {
  55                         System::httpExit(403);
  56                 }
  57
  58                 $user = '';
  59                 if ($a->argc > 1) {
  60                         $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  61                                 DBA::escape($a->argv[1])
  62                         );
  63                         if (!$r) {
  64                                 System::httpExit(404);
  65                         }
  66
  67                         $hidewall = ($r[0]['hidewall'] && !local_user());
  68
  69                         $user = $r[0]['nickname'];
  70                 }
  71
  72                 Logger::log('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  73                 header("Content-type: application/atom+xml");
  74                 echo DFRN::feed('', $user, $last_update, 0, $hidewall);
  75                 killme();
  76         }
  77
  78         if (($type === 'profile') && (!strlen($sec))) {
  79                 $sql_extra = '';
  80                 switch ($direction) {
  81                         case -1:
  82                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
  83                                 $my_id = $dfrn_id;
  84                                 break;
  85                         case 0:
  86                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  87                                 $my_id = '1:' . $dfrn_id;
  88                                 break;
  89                         case 1:
  90                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  91                                 $my_id = '0:' . $dfrn_id;
  92                                 break;
  93                         default:
  94                                 $a->internalRedirect();
  95                                 break; // NOTREACHED
  96                 }
  97
  98                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  99                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 100                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 101                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 102                         DBA::escape($a->argv[1])
 103                 );
 104
 105                 if (DBA::isResult($r)) {
 106                         $s = Network::fetchUrl($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
 107
 108                         Logger::log("dfrn_poll: old profile returns " . $s, Logger::DATA);
 109
 110                         if (strlen($s)) {
 111                                 $xml = XML::parseString($s);
 112
 113                                 if ((int)$xml->status === 1) {
 114                                         $_SESSION['authenticated'] = 1;
 115                                         if (!x($_SESSION, 'remote')) {
 116                                                 $_SESSION['remote'] = [];
 117                                         }
 118
 119                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 120
 121                                         $_SESSION['visitor_id'] = $r[0]['id'];
 122                                         $_SESSION['visitor_home'] = $r[0]['url'];
 123                                         $_SESSION['visitor_handle'] = $r[0]['addr'];
 124                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 125                                         $_SESSION['my_url'] = $r[0]['url'];
 126                                         if (!$quiet) {
 127                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 128                                         }
 129
 130                                         // Visitors get 1 day session.
 131                                         $session_id = session_id();
 132                                         $expire = time() + 86400;
 133                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 134                                                 DBA::escape($expire),
 135                                                 DBA::escape($session_id)
 136                                         );
 137                                 }
 138                         }
 139
 140                         $profile = (count($r) > 0 && isset($r[0]['nickname']) ? $r[0]['nickname'] : '');
 141                         if (!empty($destination_url)) {
 142                                 System::externalRedirect($destination_url);
 143                         } else {
 144                                 $a->internalRedirect('profile/' . $profile);
 145                         }
 146                 }
 147                 $a->internalRedirect();
 148         }
 149
 150         if ($type === 'profile-check' && $dfrn_version < 2.2) {
 151                 if ((strlen($challenge)) && (strlen($sec))) {
 152                         DBA::delete('profile_check', ["`expire` < ?", time()]);
 153                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 154                                 DBA::escape($sec)
 155                         );
 156                         if (!DBA::isResult($r)) {
 157                                 System::xmlExit(3, 'No ticket');
 158                                 // NOTREACHED
 159                         }
 160
 161                         $orig_id = $r[0]['dfrn_id'];
 162                         if (strpos($orig_id, ':')) {
 163                                 $orig_id = substr($orig_id, 2);
 164                         }
 165
 166                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 167                                 intval($r[0]['cid'])
 168                         );
 169                         if (!DBA::isResult($c)) {
 170                                 System::xmlExit(3, 'No profile');
 171                         }
 172
 173                         $contact = $c[0];
 174
 175                         $sent_dfrn_id = hex2bin($dfrn_id);
 176                         $challenge = hex2bin($challenge);
 177
 178                         $final_dfrn_id = '';
 179
 180                         if (($contact['duplex']) && strlen($contact['prvkey'])) {
 181                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 182                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 183                         } else {
 184                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 185                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 186                         }
 187
 188                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 189
 190                         if (strpos($final_dfrn_id, ':') == 1) {
 191                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 192                         }
 193
 194                         if ($final_dfrn_id != $orig_id) {
 195                                 Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
 196                                 // did not decode properly - cannot trust this site
 197                                 System::xmlExit(3, 'Bad decryption');
 198                         }
 199
 200                         header("Content-type: text/xml");
 201                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 202                         killme();
 203                         // NOTREACHED
 204                 } else {
 205                         // old protocol
 206                         switch ($direction) {
 207                                 case 1:
 208                                         $dfrn_id = '0:' . $dfrn_id;
 209                                         break;
 210                                 case 0:
 211                                         $dfrn_id = '1:' . $dfrn_id;
 212                                         break;
 213                                 default:
 214                                         break;
 215                         }
 216
 217                         DBA::delete('profile_check', ["`expire` < ?", time()]);
 218                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 219                                 DBA::escape($dfrn_id));
 220                         if (DBA::isResult($r)) {
 221                                 System::xmlExit(1);
 222                                 return; // NOTREACHED
 223                         }
 224                         System::xmlExit(0);
 225                         return; // NOTREACHED
 226                 }
 227         }
 228 }
 229
 230 function dfrn_poll_post(App $a)
 231 {
 232         $dfrn_id      = x($_POST,'dfrn_id')      ? $_POST['dfrn_id']              : '';
 233         $challenge    = x($_POST,'challenge')    ? $_POST['challenge']            : '';
 234         $url          = x($_POST,'url')          ? $_POST['url']                  : '';
 235         $sec          = x($_POST,'sec')          ? $_POST['sec']                  : '';
 236         $ptype        = x($_POST,'type')         ? $_POST['type']                 : '';
 237         $dfrn_version = x($_POST,'dfrn_version') ? (float) $_POST['dfrn_version'] : 2.0;
 238         $perm         = x($_POST,'perm')         ? $_POST['perm']                 : 'r';
 239
 240         if ($ptype === 'profile-check') {
 241                 if (strlen($challenge) && strlen($sec)) {
 242                         Logger::log('dfrn_poll: POST: profile-check');
 243
 244                         DBA::delete('profile_check', ["`expire` < ?", time()]);
 245                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 246                                 DBA::escape($sec)
 247                         );
 248                         if (!DBA::isResult($r)) {
 249                                 System::xmlExit(3, 'No ticket');
 250                                 // NOTREACHED
 251                         }
 252
 253                         $orig_id = $r[0]['dfrn_id'];
 254                         if (strpos($orig_id, ':')) {
 255                                 $orig_id = substr($orig_id, 2);
 256                         }
 257
 258                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 259                                 intval($r[0]['cid'])
 260                         );
 261                         if (!DBA::isResult($c)) {
 262                                 System::xmlExit(3, 'No profile');
 263                         }
 264
 265                         $contact = $c[0];
 266
 267                         $sent_dfrn_id = hex2bin($dfrn_id);
 268                         $challenge = hex2bin($challenge);
 269
 270                         $final_dfrn_id = '';
 271
 272                         if ($contact['duplex'] && strlen($contact['prvkey'])) {
 273                                 openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
 274                                 openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
 275                         } else {
 276                                 openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
 277                                 openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
 278                         }
 279
 280                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 281
 282                         if (strpos($final_dfrn_id, ':') == 1) {
 283                                 $final_dfrn_id = substr($final_dfrn_id, 2);
 284                         }
 285
 286                         if ($final_dfrn_id != $orig_id) {
 287                                 Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
 288                                 // did not decode properly - cannot trust this site
 289                                 System::xmlExit(3, 'Bad decryption');
 290                         }
 291
 292                         header("Content-type: text/xml");
 293                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 294                         killme();
 295                         // NOTREACHED
 296                 }
 297         }
 298
 299         $direction = -1;
 300         if (strpos($dfrn_id, ':') == 1) {
 301                 $direction = intval(substr($dfrn_id, 0, 1));
 302                 $dfrn_id = substr($dfrn_id, 2);
 303         }
 304
 305         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 306                 DBA::escape($dfrn_id),
 307                 DBA::escape($challenge)
 308         );
 309
 310         if (!DBA::isResult($r)) {
 311                 killme();
 312         }
 313
 314         $type = $r[0]['type'];
 315         $last_update = $r[0]['last_update'];
 316
 317         DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]);
 318
 319         $sql_extra = '';
 320         switch ($direction) {
 321                 case -1:
 322                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 323                         $my_id = $dfrn_id;
 324                         break;
 325                 case 0:
 326                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 327                         $my_id = '1:' . $dfrn_id;
 328                         break;
 329                 case 1:
 330                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 331                         $my_id = '0:' . $dfrn_id;
 332                         break;
 333                 default:
 334                         $a->internalRedirect();
 335                         break; // NOTREACHED
 336         }
 337
 338         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 339         if (!DBA::isResult($r)) {
 340                 killme();
 341         }
 342
 343         $contact = $r[0];
 344         $owner_uid = $r[0]['uid'];
 345         $contact_id = $r[0]['id'];
 346
 347         if ($type === 'reputation' && strlen($url)) {
 348                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 349                         DBA::escape($url),
 350                         intval($owner_uid)
 351                 );
 352                 $reputation = 0;
 353                 $text = '';
 354
 355                 if (DBA::isResult($r)) {
 356                         $reputation = $r[0]['rating'];
 357                         $text = $r[0]['reason'];
 358
 359                         if ($r[0]['id'] == $contact_id) { // inquiring about own reputation not allowed
 360                                 $reputation = 0;
 361                                 $text = '';
 362                         }
 363                 }
 364
 365                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 366                 <reputation>
 367                         <url>$url</url>
 368                         <rating>$reputation</rating>
 369                         <description>$text</description>
 370                 </reputation>
 371                 ";
 372                 killme();
 373                 // NOTREACHED
 374         } else {
 375                 // Update the writable flag if it changed
 376                 Logger::log('dfrn_poll: post request feed: ' . print_r($_POST, true), Logger::DATA);
 377                 if ($dfrn_version >= 2.21) {
 378                         if ($perm === 'rw') {
 379                                 $writable = 1;
 380                         } else {
 381                                 $writable = 0;
 382                         }
 383
 384                         if ($writable != $contact['writable']) {
 385                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
 386                                         intval($writable),
 387                                         intval($contact_id)
 388                                 );
 389                         }
 390                 }
 391
 392                 header("Content-type: application/atom+xml");
 393                 $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
 394                 echo $o;
 395                 killme();
 396         }
 397 }
 398
 399 function dfrn_poll_content(App $a)
 400 {
 401         $dfrn_id         = x($_GET,'dfrn_id')         ? $_GET['dfrn_id']              : '';
 402         $type            = x($_GET,'type')            ? $_GET['type']                 : 'data';
 403         $last_update     = x($_GET,'last_update')     ? $_GET['last_update']          : '';
 404         $destination_url = x($_GET,'destination_url') ? $_GET['destination_url']      : '';
 405         $sec             = x($_GET,'sec')             ? $_GET['sec']                  : '';
 406         $dfrn_version    = x($_GET,'dfrn_version')    ? (float) $_GET['dfrn_version'] : 2.0;
 407         $perm            = x($_GET,'perm')            ? $_GET['perm']                 : 'r';
 408         $quiet           = x($_GET,'quiet')           ? true                          : false;
 409
 410         $direction = -1;
 411         if (strpos($dfrn_id, ':') == 1) {
 412                 $direction = intval(substr($dfrn_id, 0, 1));
 413                 $dfrn_id = substr($dfrn_id, 2);
 414         }
 415
 416         if ($dfrn_id != '') {
 417                 // initial communication from external contact
 418                 $hash = random_string();
 419
 420                 $status = 0;
 421
 422                 DBA::delete('challenge', ["`expire` < ?", time()]);
 423
 424                 if ($type !== 'profile') {
 425                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 426                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 427                                 DBA::escape($hash),
 428                                 DBA::escape($dfrn_id),
 429                                 intval(time() + 60 ),
 430                                 DBA::escape($type),
 431                                 DBA::escape($last_update)
 432                         );
 433                 }
 434
 435                 $sql_extra = '';
 436                 switch ($direction) {
 437                         case -1:
 438                                 if ($type === 'profile') {
 439                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
 440                                 } else {
 441                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
 442                                 }
 443
 444                                 $my_id = $dfrn_id;
 445                                 break;
 446                         case 0:
 447                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 448                                 $my_id = '1:' . $dfrn_id;
 449                                 break;
 450                         case 1:
 451                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
 452                                 $my_id = '0:' . $dfrn_id;
 453                                 break;
 454                         default:
 455                                 $a->internalRedirect();
 456                                 break; // NOTREACHED
 457                 }
 458
 459                 $nickname = $a->argv[1];
 460
 461                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 462                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 463                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 464                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 465                         DBA::escape($nickname)
 466                 );
 467                 if (DBA::isResult($r)) {
 468                         $challenge = '';
 469                         $encrypted_id = '';
 470                         $id_str = $my_id . '.' . mt_rand(1000, 9999);
 471
 472                         if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) {
 473                                 openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']);
 474                                 openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']);
 475                         } else {
 476                                 openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']);
 477                                 openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']);
 478                         }
 479
 480                         $challenge = bin2hex($challenge);
 481                         $encrypted_id = bin2hex($encrypted_id);
 482                 } else {
 483                         $status = 1;
 484                         $challenge = '';
 485                         $encrypted_id = '';
 486                 }
 487
 488                 if (($type === 'profile') && (strlen($sec))) {
 489                         // heluecht: I don't know why we don't fail immediately when the user or contact hadn't been found.
 490                         // Since it doesn't make sense to continue from this point on, we now fail here. This should be safe.
 491                         if (!DBA::isResult($r)) {
 492                                 System::httpExit(404, ["title" => L10n::t('Page not found.')]);
 493                         }
 494
 495                         // URL reply
 496                         if ($dfrn_version < 2.2) {
 497                                 $s = Network::fetchUrl($r[0]['poll']
 498                                         . '?dfrn_id=' . $encrypted_id
 499                                         . '&type=profile-check'
 500                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 501                                         . '&challenge=' . $challenge
 502                                         . '&sec=' . $sec
 503                                 );
 504                         } else {
 505                                 $s = Network::post($r[0]['poll'], [
 506                                         'dfrn_id' => $encrypted_id,
 507                                         'type' => 'profile-check',
 508                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 509                                         'challenge' => $challenge,
 510                                         'sec' => $sec
 511                                 ])->getBody();
 512                         }
 513
 514                         Logger::log("dfrn_poll: sec profile: " . $s, Logger::DATA);
 515
 516                         if (strlen($s) && strstr($s, '<?xml')) {
 517                                 $xml = XML::parseString($s);
 518
 519                                 Logger::log('dfrn_poll: profile: parsed xml: ' . print_r($xml, true), Logger::DATA);
 520
 521                                 Logger::log('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 522                                 Logger::log('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 523
 524                                 if (((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) {
 525                                         $_SESSION['authenticated'] = 1;
 526                                         if (!x($_SESSION, 'remote')) {
 527                                                 $_SESSION['remote'] = [];
 528                                         }
 529
 530                                         $_SESSION['remote'][] = ['cid' => $r[0]['id'], 'uid' => $r[0]['uid'], 'url' => $r[0]['url']];
 531                                         $_SESSION['visitor_id'] = $r[0]['id'];
 532                                         $_SESSION['visitor_home'] = $r[0]['url'];
 533                                         $_SESSION['visitor_visiting'] = $r[0]['uid'];
 534                                         $_SESSION['my_url'] = $r[0]['url'];
 535                                         if (!$quiet) {
 536                                                 info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
 537                                         }
 538
 539                                         // Visitors get 1 day session.
 540                                         $session_id = session_id();
 541                                         $expire = time() + 86400;
 542                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
 543                                                 DBA::escape($expire),
 544                                                 DBA::escape($session_id)
 545                                         );
 546                                 }
 547                         }
 548
 549                         $profile = ((DBA::isResult($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
 550
 551                         switch ($destination_url) {
 552                                 case 'profile':
 553                                         $a->internalRedirect('profile/' . $profile . '?f=&tab=profile');
 554                                         break;
 555                                 case 'photos':
 556                                         $a->internalRedirect('photos/' . $profile);
 557                                         break;
 558                                 case 'status':
 559                                 case '':
 560                                         $a->internalRedirect('profile/' . $profile);
 561                                         break;
 562                                 default:
 563                                         $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
 564                                         System::externalRedirect($destination_url . $appendix);
 565                                         break;
 566                         }
 567                         // NOTREACHED
 568                 } else {
 569                         // XML reply
 570                         header("Content-type: text/xml");
 571                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 572                                 . '<dfrn_poll>' . "\r\n"
 573                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 574                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 575                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 576                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 577                                 . '</dfrn_poll>' . "\r\n";
 578                         killme();
 579                         // NOTREACHED
 580                 }
 581         }
 582 }