mod/dfrn_confirm.php

   1 <?php
   2 /**
   3  * @file mod/dfrn_confirm.php
   4  * @brief Module: dfrn_confirm
   5  * Purpose: Friendship acceptance for DFRN contacts
   6  *
   7  * There are two possible entry points and three scenarios.
   8  *
   9  *   1. A form was submitted by our user approving a friendship that originated elsewhere.
  10  *      This may also be called from dfrn_request to automatically approve a friendship.
  11  *
  12  *   2. We may be the target or other side of the conversation to scenario 1, and will
  13  *      interact with that process on our own user's behalf.
  14  *
  15  *  @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
  16  *    You also find a graphic which describes the confirmation process at
  17  *    https://github.com/friendica/friendica/blob/master/spec/dfrn2_contact_confirmation.png
  18  */
  19
  20 use Friendica\App;
  21 use Friendica\Core\Config;
  22 use Friendica\Core\L10n;
  23 use Friendica\Core\System;
  24 use Friendica\Database\DBA;
  25 use Friendica\Model\Contact;
  26 use Friendica\Model\Group;
  27 use Friendica\Model\User;
  28 use Friendica\Network\Probe;
  29 use Friendica\Protocol\Diaspora;
  30 use Friendica\Util\Crypto;
  31 use Friendica\Util\DateTimeFormat;
  32 use Friendica\Util\Network;
  33 use Friendica\Util\XML;
  34
  35 require_once 'include/enotify.php';
  36 require_once 'include/items.php';
  37
  38 function dfrn_confirm_post(App $a, $handsfree = null)
  39 {
  40         $node = null;
  41         if (is_array($handsfree)) {
  42                 /*
  43                  * We were called directly from dfrn_request due to automatic friend acceptance.
  44                  * Any $_POST parameters we may require are supplied in the $handsfree array.
  45                  *
  46                  */
  47                 $node = $handsfree['node'];
  48                 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
  49         } elseif ($a->argc > 1) {
  50                 $node = $a->argv[1];
  51         }
  52
  53         /*
  54          * Main entry point. Scenario 1. Our user received a friend request notification (perhaps
  55          * from another site) and clicked 'Approve'.
  56          * $POST['source_url'] is not set. If it is, it indicates Scenario 2.
  57          *
  58          * We may also have been called directly from dfrn_request ($handsfree != null) due to
  59          * this being a page type which supports automatic friend acceptance. That is also Scenario 1
  60          * since we are operating on behalf of our registered user to approve a friendship.
  61          */
  62         if (!x($_POST, 'source_url')) {
  63                 $uid = defaults($handsfree, 'uid', local_user());
  64                 if (!$uid) {
  65                         notice(L10n::t('Permission denied.') . EOL);
  66                         return;
  67                 }
  68
  69                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
  70                 if (!DBA::isResult($user)) {
  71                         notice(L10n::t('Profile not found.') . EOL);
  72                         return;
  73                 }
  74
  75                 // These data elements may come from either the friend request notification form or $handsfree array.
  76                 if (is_array($handsfree)) {
  77                         logger('Confirm in handsfree mode');
  78                         $dfrn_id  = $handsfree['dfrn_id'];
  79                         $intro_id = $handsfree['intro_id'];
  80                         $duplex   = $handsfree['duplex'];
  81                         $cid      = 0;
  82                         $hidden   = intval(defaults($handsfree, 'hidden'  , 0));
  83                 } else {
  84                         $dfrn_id  = notags(trim(defaults($_POST, 'dfrn_id'   , '')));
  85                         $intro_id =      intval(defaults($_POST, 'intro_id'  , 0));
  86                         $duplex   =      intval(defaults($_POST, 'duplex'    , 0));
  87                         $cid      =      intval(defaults($_POST, 'contact_id', 0));
  88                         $hidden   =      intval(defaults($_POST, 'hidden'    , 0));
  89                 }
  90
  91                 /*
  92                  * Ensure that dfrn_id has precedence when we go to find the contact record.
  93                  * We only want to search based on contact id if there is no dfrn_id,
  94                  * e.g. for OStatus network followers.
  95                  */
  96                 if (strlen($dfrn_id)) {
  97                         $cid = 0;
  98                 }
  99
 100                 logger('Confirming request for dfrn_id (issued) ' . $dfrn_id);
 101                 if ($cid) {
 102                         logger('Confirming follower with contact_id: ' . $cid);
 103                 }
 104
 105                 /*
 106                  * The other person will have been issued an ID when they first requested friendship.
 107                  * Locate their record. At this time, their record will have both pending and blocked set to 1.
 108                  * There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
 109                  */
 110                 $r = q("SELECT *
 111                         FROM `contact`
 112                         WHERE (
 113                                 (`issued-id` != '' AND `issued-id` = '%s')
 114                                 OR
 115                                 (`id` = %d AND `id` != 0)
 116                         )
 117                         AND `uid` = %d
 118                         AND `duplex` = 0
 119                         LIMIT 1",
 120                         dbesc($dfrn_id),
 121                         intval($cid),
 122                         intval($uid)
 123                 );
 124                 if (!DBA::isResult($r)) {
 125                         logger('Contact not found in DB.');
 126                         notice(L10n::t('Contact not found.') . EOL);
 127                         notice(L10n::t('This may occasionally happen if contact was requested by both persons and it has already been approved.') . EOL);
 128                         return;
 129                 }
 130
 131                 $contact = $r[0];
 132
 133                 $contact_id   = $contact['id'];
 134                 $relation     = $contact['rel'];
 135                 $site_pubkey  = $contact['site-pubkey'];
 136                 $dfrn_confirm = $contact['confirm'];
 137                 $aes_allow    = $contact['aes_allow'];
 138
 139                 $network = ((strlen($contact['issued-id'])) ? NETWORK_DFRN : NETWORK_OSTATUS);
 140
 141                 if ($contact['network']) {
 142                         $network = $contact['network'];
 143                 }
 144
 145                 if ($network === NETWORK_DFRN) {
 146                         /*
 147                          * Generate a key pair for all further communications with this person.
 148                          * We have a keypair for every contact, and a site key for unknown people.
 149                          * This provides a means to carry on relationships with other people if
 150                          * any single key is compromised. It is a robust key. We're much more
 151                          * worried about key leakage than anybody cracking it.
 152                          */
 153                         $res = Crypto::newKeypair(4096);
 154
 155                         $private_key = $res['prvkey'];
 156                         $public_key  = $res['pubkey'];
 157
 158                         // Save the private key. Send them the public key.
 159                         q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d",
 160                                 dbesc($private_key),
 161                                 intval($contact_id),
 162                                 intval($uid)
 163                         );
 164
 165                         $params = [];
 166
 167                         /*
 168                          * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
 169                          * site private key (person on the other end can decrypt it with our site public key).
 170                          * Then encrypt our profile URL with the other person's site public key. They can decrypt
 171                          * it with their site private key. If the decryption on the other end fails for either
 172                          * item, it indicates tampering or key failure on at least one site and we will not be
 173                          * able to provide a secure communication pathway.
 174                          *
 175                          * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
 176                          * or later) then we encrypt the personal public key we send them using AES-256-CBC and a
 177                          * random key which is encrypted with their site public key.
 178                          */
 179
 180                         $src_aes_key = openssl_random_pseudo_bytes(64);
 181
 182                         $result = '';
 183                         openssl_private_encrypt($dfrn_id, $result, $user['prvkey']);
 184
 185                         $params['dfrn_id'] = bin2hex($result);
 186                         $params['public_key'] = $public_key;
 187
 188                         $my_url = System::baseUrl() . '/profile/' . $user['nickname'];
 189
 190                         openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
 191                         $params['source_url'] = bin2hex($params['source_url']);
 192
 193                         if ($aes_allow && function_exists('openssl_encrypt')) {
 194                                 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
 195                                 $params['aes_key'] = bin2hex($params['aes_key']);
 196                                 $params['public_key'] = bin2hex(openssl_encrypt($public_key, 'AES-256-CBC', $src_aes_key));
 197                         }
 198
 199                         $params['dfrn_version'] = DFRN_PROTOCOL_VERSION;
 200                         if ($duplex == 1) {
 201                                 $params['duplex'] = 1;
 202                         }
 203
 204                         if ($user['page-flags'] == PAGE_COMMUNITY) {
 205                                 $params['page'] = 1;
 206                         }
 207
 208                         if ($user['page-flags'] == PAGE_PRVGROUP) {
 209                                 $params['page'] = 2;
 210                         }
 211
 212                         logger('Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params, true), LOGGER_DATA);
 213
 214                         /*
 215                          *
 216                          * POST all this stuff to the other site.
 217                          * Temporarily raise the network timeout to 120 seconds because the default 60
 218                          * doesn't always give the other side quite enough time to decrypt everything.
 219                          *
 220                          */
 221
 222                         $res = Network::post($dfrn_confirm, $params, null, $redirects, 120);
 223
 224                         logger(' Confirm: received data: ' . $res, LOGGER_DATA);
 225
 226                         // Now figure out what they responded. Try to be robust if the remote site is
 227                         // having difficulty and throwing up errors of some kind.
 228
 229                         $leading_junk = substr($res, 0, strpos($res, '<?xml'));
 230
 231                         $res = substr($res, strpos($res, '<?xml'));
 232                         if (!strlen($res)) {
 233                                 // No XML at all, this exchange is messed up really bad.
 234                                 // We shouldn't proceed, because the xml parser might choke,
 235                                 // and $status is going to be zero, which indicates success.
 236                                 // We can hardly call this a success.
 237                                 notice(L10n::t('Response from remote site was not understood.') . EOL);
 238                                 return;
 239                         }
 240
 241                         if (strlen($leading_junk) && Config::get('system', 'debugging')) {
 242                                 // This might be more common. Mixed error text and some XML.
 243                                 // If we're configured for debugging, show the text. Proceed in either case.
 244                                 notice(L10n::t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL);
 245                         }
 246
 247                         if (stristr($res, "<status") === false) {
 248                                 // wrong xml! stop here!
 249                                 notice(L10n::t('Unexpected response from remote site: ') . EOL . htmlspecialchars($res) . EOL);
 250                                 return;
 251                         }
 252
 253                         $xml = XML::parseString($res);
 254                         $status = (int) $xml->status;
 255                         $message = unxmlify($xml->message);   // human readable text of what may have gone wrong.
 256                         switch ($status) {
 257                                 case 0:
 258                                         info(L10n::t("Confirmation completed successfully.") . EOL);
 259                                         break;
 260                                 case 1:
 261                                         // birthday paradox - generate new dfrn-id and fall through.
 262                                         $new_dfrn_id = random_string();
 263                                         q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d",
 264                                                 dbesc($new_dfrn_id),
 265                                                 intval($contact_id),
 266                                                 intval($uid)
 267                                         );
 268
 269                                 case 2:
 270                                         notice(L10n::t("Temporary failure. Please wait and try again.") . EOL);
 271                                         break;
 272                                 case 3:
 273                                         notice(L10n::t("Introduction failed or was revoked.") . EOL);
 274                                         break;
 275                         }
 276
 277                         if (strlen($message)) {
 278                                 notice(L10n::t('Remote site reported: ') . $message . EOL);
 279                         }
 280
 281                         if (($status == 0) && $intro_id) {
 282                                 $intro = DBA::selectFirst('intro', ['note'], ['id' => $intro_id]);
 283                                 if (DBA::isResult($intro)) {
 284                                         DBA::update('contact', ['reason' => $intro['note']], ['id' => $contact_id]);
 285                                 }
 286
 287                                 // Success. Delete the notification.
 288                                 DBA::delete('intro', ['id' => $intro_id]);
 289                         }
 290
 291                         if ($status != 0) {
 292                                 return;
 293                         }
 294                 }
 295
 296                 /*
 297                  * We have now established a relationship with the other site.
 298                  * Let's make our own personal copy of their profile photo so we don't have
 299                  * to always load it from their site.
 300                  *
 301                  * We will also update the contact record with the nature and scope of the relationship.
 302                  */
 303                 Contact::updateAvatar($contact['photo'], $uid, $contact_id);
 304
 305                 logger('dfrn_confirm: confirm - imported photos');
 306
 307                 if ($network === NETWORK_DFRN) {
 308                         $new_relation = CONTACT_IS_FOLLOWER;
 309                         if (($relation == CONTACT_IS_SHARING) || ($duplex)) {
 310                                 $new_relation = CONTACT_IS_FRIEND;
 311                         }
 312
 313                         if (($relation == CONTACT_IS_SHARING) && ($duplex)) {
 314                                 $duplex = 0;
 315                         }
 316
 317                         $r = q("UPDATE `contact` SET `rel` = %d,
 318                                 `name-date` = '%s',
 319                                 `uri-date` = '%s',
 320                                 `blocked` = 0,
 321                                 `pending` = 0,
 322                                 `duplex` = %d,
 323                                 `hidden` = %d,
 324                                 `network` = '%s' WHERE `id` = %d
 325                         ",
 326                                 intval($new_relation),
 327                                 dbesc(DateTimeFormat::utcNow()),
 328                                 dbesc(DateTimeFormat::utcNow()),
 329                                 intval($duplex),
 330                                 intval($hidden),
 331                                 dbesc(NETWORK_DFRN),
 332                                 intval($contact_id)
 333                         );
 334                 } else {
 335                         // $network !== NETWORK_DFRN
 336                         $network = defaults($contact, 'network', NETWORK_OSTATUS);
 337
 338                         $arr = Probe::uri($contact['url']);
 339
 340                         $notify  = defaults($contact, 'notify' , $arr['notify']);
 341                         $poll    = defaults($contact, 'poll'   , $arr['poll']);
 342
 343                         $addr = $arr['addr'];
 344
 345                         $new_relation = $contact['rel'];
 346                         $writable = $contact['writable'];
 347
 348                         if ($network === NETWORK_DIASPORA) {
 349                                 if ($duplex) {
 350                                         $new_relation = CONTACT_IS_FRIEND;
 351                                 } else {
 352                                         $new_relation = CONTACT_IS_FOLLOWER;
 353                                 }
 354
 355                                 if ($new_relation != CONTACT_IS_FOLLOWER) {
 356                                         $writable = 1;
 357                                 }
 358                         }
 359
 360                         DBA::delete('intro', ['id' => $intro_id]);
 361
 362                         $r = q("UPDATE `contact` SET `name-date` = '%s',
 363                                 `uri-date` = '%s',
 364                                 `addr` = '%s',
 365                                 `notify` = '%s',
 366                                 `poll` = '%s',
 367                                 `blocked` = 0,
 368                                 `pending` = 0,
 369                                 `network` = '%s',
 370                                 `writable` = %d,
 371                                 `hidden` = %d,
 372                                 `rel` = %d
 373                                 WHERE `id` = %d
 374                         ",
 375                                 dbesc(DateTimeFormat::utcNow()),
 376                                 dbesc(DateTimeFormat::utcNow()),
 377                                 dbesc($addr),
 378                                 dbesc($notify),
 379                                 dbesc($poll),
 380                                 dbesc($network),
 381                                 intval($writable),
 382                                 intval($hidden),
 383                                 intval($new_relation),
 384                                 intval($contact_id)
 385                         );
 386                 }
 387
 388                 if (!DBA::isResult($r)) {
 389                         notice(L10n::t('Unable to set contact photo.') . EOL);
 390                 }
 391
 392                 // reload contact info
 393                 $contact = DBA::selectFirst('contact', [], ['id' => $contact_id]);
 394                 if ((isset($new_relation) && $new_relation == CONTACT_IS_FRIEND)) {
 395                         if (DBA::isResult($contact) && ($contact['network'] === NETWORK_DIASPORA)) {
 396                                 $ret = Diaspora::sendShare($user, $contact);
 397                                 logger('share returns: ' . $ret);
 398                         }
 399                 }
 400
 401                 Group::addMember(User::getDefaultGroup($uid, $contact["network"]), $contact['id']);
 402
 403                 // Let's send our user to the contact editor in case they want to
 404                 // do anything special with this new friend.
 405                 if ($handsfree === null) {
 406                         goaway(System::baseUrl() . '/contacts/' . intval($contact_id));
 407                 } else {
 408                         return;
 409                 }
 410                 //NOTREACHED
 411         }
 412
 413         /*
 414          * End of Scenario 1. [Local confirmation of remote friend request].
 415          *
 416          * Begin Scenario 2. This is the remote response to the above scenario.
 417          * This will take place on the site that originally initiated the friend request.
 418          * In the section above where the confirming party makes a POST and
 419          * retrieves xml status information, they are communicating with the following code.
 420          */
 421         if (x($_POST, 'source_url')) {
 422                 // We are processing an external confirmation to an introduction created by our user.
 423                 $public_key =         defaults($_POST, 'public_key', '');
 424                 $dfrn_id    = hex2bin(defaults($_POST, 'dfrn_id'   , ''));
 425                 $source_url = hex2bin(defaults($_POST, 'source_url', ''));
 426                 $aes_key    =         defaults($_POST, 'aes_key'   , '');
 427                 $duplex     =  intval(defaults($_POST, 'duplex'    , 0));
 428                 $page       =  intval(defaults($_POST, 'page'      , 0));
 429
 430                 $forum = (($page == 1) ? 1 : 0);
 431                 $prv   = (($page == 2) ? 1 : 0);
 432
 433                 logger('dfrn_confirm: requestee contacted: ' . $node);
 434
 435                 logger('dfrn_confirm: request: POST=' . print_r($_POST, true), LOGGER_DATA);
 436
 437                 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
 438
 439                 if (x($aes_key)) {
 440                         $aes_key = hex2bin($aes_key);
 441                         $public_key = hex2bin($public_key);
 442                 }
 443
 444                 // Find our user's account
 445                 $user = DBA::selectFirst('user', [], ['nickname' => $node]);
 446                 if (!DBA::isResult($user)) {
 447                         $message = L10n::t('No user record found for \'%s\' ', $node);
 448                         System::xmlExit(3, $message); // failure
 449                         // NOTREACHED
 450                 }
 451
 452                 $my_prvkey = $user['prvkey'];
 453                 $local_uid = $user['uid'];
 454
 455
 456                 if (!strstr($my_prvkey, 'PRIVATE KEY')) {
 457                         $message = L10n::t('Our site encryption key is apparently messed up.');
 458                         System::xmlExit(3, $message);
 459                 }
 460
 461                 // verify everything
 462
 463                 $decrypted_source_url = "";
 464                 openssl_private_decrypt($source_url, $decrypted_source_url, $my_prvkey);
 465
 466
 467                 if (!strlen($decrypted_source_url)) {
 468                         $message = L10n::t('Empty site URL was provided or URL could not be decrypted by us.');
 469                         System::xmlExit(3, $message);
 470                         // NOTREACHED
 471                 }
 472
 473                 $contact = DBA::selectFirst('contact', [], ['url' => $decrypted_source_url, 'uid' => $local_uid]);
 474                 if (!DBA::isResult($contact)) {
 475                         if (strstr($decrypted_source_url, 'http:')) {
 476                                 $newurl = str_replace('http:', 'https:', $decrypted_source_url);
 477                         } else {
 478                                 $newurl = str_replace('https:', 'http:', $decrypted_source_url);
 479                         }
 480
 481                         $contact = DBA::selectFirst('contact', [], ['url' => $newurl, 'uid' => $local_uid]);
 482                         if (!DBA::isResult($contact)) {
 483                                 // this is either a bogus confirmation (?) or we deleted the original introduction.
 484                                 $message = L10n::t('Contact record was not found for you on our site.');
 485                                 System::xmlExit(3, $message);
 486                                 return; // NOTREACHED
 487                         }
 488                 }
 489
 490                 $relation = $contact['rel'];
 491
 492                 // Decrypt all this stuff we just received
 493
 494                 $foreign_pubkey = $contact['site-pubkey'];
 495                 $dfrn_record = $contact['id'];
 496
 497                 if (!$foreign_pubkey) {
 498                         $message = L10n::t('Site public key not available in contact record for URL %s.', $decrypted_source_url);
 499                         System::xmlExit(3, $message);
 500                 }
 501
 502                 $decrypted_dfrn_id = "";
 503                 openssl_public_decrypt($dfrn_id, $decrypted_dfrn_id, $foreign_pubkey);
 504
 505                 if (strlen($aes_key)) {
 506                         $decrypted_aes_key = "";
 507                         openssl_private_decrypt($aes_key, $decrypted_aes_key, $my_prvkey);
 508                         $dfrn_pubkey = openssl_decrypt($public_key, 'AES-256-CBC', $decrypted_aes_key);
 509                 } else {
 510                         $dfrn_pubkey = $public_key;
 511                 }
 512
 513                 if (DBA::exists('contact', ['dfrn-id' => $decrypted_dfrn_id])) {
 514                         $message = L10n::t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
 515                         System::xmlExit(1, $message); // Birthday paradox - duplicate dfrn-id
 516                         // NOTREACHED
 517                 }
 518
 519                 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d",
 520                         dbesc($decrypted_dfrn_id),
 521                         dbesc($dfrn_pubkey),
 522                         intval($dfrn_record)
 523                 );
 524                 if (!DBA::isResult($r)) {
 525                         $message = L10n::t('Unable to set your contact credentials on our system.');
 526                         System::xmlExit(3, $message);
 527                 }
 528
 529                 // It's possible that the other person also requested friendship.
 530                 // If it is a duplex relationship, ditch the issued-id if one exists.
 531
 532                 if ($duplex) {
 533                         q("UPDATE `contact` SET `issued-id` = '' WHERE `id` = %d",
 534                                 intval($dfrn_record)
 535                         );
 536                 }
 537
 538                 // We're good but now we have to scrape the profile photo and send notifications.
 539                 $contact = DBA::selectFirst('contact', ['photo'], ['id' => $dfrn_record]);
 540                 if (DBA::isResult($contact)) {
 541                         $photo = $contact['photo'];
 542                 } else {
 543                         $photo = System::baseUrl() . '/images/person-175.jpg';
 544                 }
 545
 546                 Contact::updateAvatar($photo, $local_uid, $dfrn_record);
 547
 548                 logger('dfrn_confirm: request - photos imported');
 549
 550                 $new_relation = CONTACT_IS_SHARING;
 551                 if (($relation == CONTACT_IS_FOLLOWER) || ($duplex)) {
 552                         $new_relation = CONTACT_IS_FRIEND;
 553                 }
 554
 555                 if (($relation == CONTACT_IS_FOLLOWER) && ($duplex)) {
 556                         $duplex = 0;
 557                 }
 558
 559                 $r = q("UPDATE `contact` SET
 560                         `rel` = %d,
 561                         `name-date` = '%s',
 562                         `uri-date` = '%s',
 563                         `blocked` = 0,
 564                         `pending` = 0,
 565                         `duplex` = %d,
 566                         `forum` = %d,
 567                         `prv` = %d,
 568                         `network` = '%s' WHERE `id` = %d
 569                 ",
 570                         intval($new_relation),
 571                         dbesc(DateTimeFormat::utcNow()),
 572                         dbesc(DateTimeFormat::utcNow()),
 573                         intval($duplex),
 574                         intval($forum),
 575                         intval($prv),
 576                         dbesc(NETWORK_DFRN),
 577                         intval($dfrn_record)
 578                 );
 579                 if (!DBA::isResult($r)) {       // indicates schema is messed up or total db failure
 580                         $message = L10n::t('Unable to update your contact profile details on our system');
 581                         System::xmlExit(3, $message);
 582                 }
 583
 584                 // Otherwise everything seems to have worked and we are almost done. Yay!
 585                 // Send an email notification
 586
 587                 logger('dfrn_confirm: request: info updated');
 588
 589                 $combined = null;
 590                 $r = q("SELECT `contact`.*, `user`.*
 591                         FROM `contact`
 592                         LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 593                         WHERE `contact`.`id` = %d
 594                         LIMIT 1",
 595                         intval($dfrn_record)
 596                 );
 597                 if (DBA::isResult($r)) {
 598                         $combined = $r[0];
 599
 600                         if ($combined['notify-flags'] & NOTIFY_CONFIRM) {
 601                                 $mutual = ($new_relation == CONTACT_IS_FRIEND);
 602                                 notification([
 603                                         'type'         => NOTIFY_CONFIRM,
 604                                         'notify_flags' => $combined['notify-flags'],
 605                                         'language'     => $combined['language'],
 606                                         'to_name'      => $combined['username'],
 607                                         'to_email'     => $combined['email'],
 608                                         'uid'          => $combined['uid'],
 609                                         'link'         => System::baseUrl() . '/contacts/' . $dfrn_record,
 610                                         'source_name'  => ((strlen(stripslashes($combined['name']))) ? stripslashes($combined['name']) : L10n::t('[Name Withheld]')),
 611                                         'source_link'  => $combined['url'],
 612                                         'source_photo' => $combined['photo'],
 613                                         'verb'         => ($mutual?ACTIVITY_FRIEND:ACTIVITY_FOLLOW),
 614                                         'otype'        => 'intro'
 615                                 ]);
 616                         }
 617                 }
 618
 619                 System::xmlExit(0); // Success
 620                 return; // NOTREACHED
 621                 ////////////////////// End of this scenario ///////////////////////////////////////////////
 622         }
 623
 624         // somebody arrived here by mistake or they are fishing. Send them to the homepage.
 625         goaway(System::baseUrl());
 626         // NOTREACHED
 627 }