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\PConfig;
  24 use Friendica\Core\System;
  25 use Friendica\Core\Worker;
  26 use Friendica\Database\DBM;
  27 use Friendica\Model\Contact;
  28 use Friendica\Model\Group;
  29 use Friendica\Model\Item;
  30 use Friendica\Model\User;
  31 use Friendica\Network\Probe;
  32 use Friendica\Protocol\Diaspora;
  33 use Friendica\Util\Crypto;
  34 use Friendica\Util\DateTimeFormat;
  35 use Friendica\Util\Network;
  36 use Friendica\Util\XML;
  37
  38 require_once 'include/enotify.php';
  39 require_once 'include/items.php';
  40
  41 function dfrn_confirm_post(App $a, $handsfree = null)
  42 {
  43         $node = null;
  44         if (is_array($handsfree)) {
  45                 /*
  46                  * We were called directly from dfrn_request due to automatic friend acceptance.
  47                  * Any $_POST parameters we may require are supplied in the $handsfree array.
  48                  *
  49                  */
  50                 $node = $handsfree['node'];
  51                 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
  52         } elseif ($a->argc > 1) {
  53                 $node = $a->argv[1];
  54         }
  55
  56         /*
  57          * Main entry point. Scenario 1. Our user received a friend request notification (perhaps
  58          * from another site) and clicked 'Approve'.
  59          * $POST['source_url'] is not set. If it is, it indicates Scenario 2.
  60          *
  61          * We may also have been called directly from dfrn_request ($handsfree != null) due to
  62          * this being a page type which supports automatic friend acceptance. That is also Scenario 1
  63          * since we are operating on behalf of our registered user to approve a friendship.
  64          */
  65         if (!x($_POST, 'source_url')) {
  66                 $uid = defaults($handsfree, 'uid', local_user());
  67                 if (!$uid) {
  68                         notice(L10n::t('Permission denied.') . EOL);
  69                         return;
  70                 }
  71
  72                 $user = dba::selectFirst('user', [], ['uid' => $uid]);
  73                 if (!DBM::is_result($user)) {
  74                         notice(L10n::t('Profile not found.') . EOL);
  75                         return;
  76                 }
  77
  78                 // These data elements may come from either the friend request notification form or $handsfree array.
  79                 if (is_array($handsfree)) {
  80                         logger('Confirm in handsfree mode');
  81                         $dfrn_id  = $handsfree['dfrn_id'];
  82                         $intro_id = $handsfree['intro_id'];
  83                         $duplex   = $handsfree['duplex'];
  84                         $cid      = 0;
  85                         $hidden   = intval(defaults($handsfree, 'hidden'  , 0));
  86                 } else {
  87                         $dfrn_id  = notags(trim(defaults($_POST, 'dfrn_id'   , '')));
  88                         $intro_id =      intval(defaults($_POST, 'intro_id'  , 0));
  89                         $duplex   =      intval(defaults($_POST, 'duplex'    , 0));
  90                         $cid      =      intval(defaults($_POST, 'contact_id', 0));
  91                         $hidden   =      intval(defaults($_POST, 'hidden'    , 0));
  92                 }
  93
  94                 /*
  95                  * Ensure that dfrn_id has precedence when we go to find the contact record.
  96                  * We only want to search based on contact id if there is no dfrn_id,
  97                  * e.g. for OStatus network followers.
  98                  */
  99                 if (strlen($dfrn_id)) {
 100                         $cid = 0;
 101                 }
 102
 103                 logger('Confirming request for dfrn_id (issued) ' . $dfrn_id);
 104                 if ($cid) {
 105                         logger('Confirming follower with contact_id: ' . $cid);
 106                 }
 107
 108                 /*
 109                  * The other person will have been issued an ID when they first requested friendship.
 110                  * Locate their record. At this time, their record will have both pending and blocked set to 1.
 111                  * There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
 112                  */
 113                 $r = q("SELECT *
 114                         FROM `contact`
 115                         WHERE (
 116                                 (`issued-id` != '' AND `issued-id` = '%s')
 117                                 OR
 118                                 (`id` = %d AND `id` != 0)
 119                         )
 120                         AND `uid` = %d
 121                         AND `duplex` = 0
 122                         LIMIT 1",
 123                         dbesc($dfrn_id),
 124                         intval($cid),
 125                         intval($uid)
 126                 );
 127                 if (!DBM::is_result($r)) {
 128                         logger('Contact not found in DB.');
 129                         notice(L10n::t('Contact not found.') . EOL);
 130                         notice(L10n::t('This may occasionally happen if contact was requested by both persons and it has already been approved.') . EOL);
 131                         return;
 132                 }
 133
 134                 $contact = $r[0];
 135
 136                 $contact_id   = $contact['id'];
 137                 $relation     = $contact['rel'];
 138                 $site_pubkey  = $contact['site-pubkey'];
 139                 $dfrn_confirm = $contact['confirm'];
 140                 $aes_allow    = $contact['aes_allow'];
 141
 142                 $network = ((strlen($contact['issued-id'])) ? NETWORK_DFRN : NETWORK_OSTATUS);
 143
 144                 if ($contact['network']) {
 145                         $network = $contact['network'];
 146                 }
 147
 148                 if ($network === NETWORK_DFRN) {
 149                         /*
 150                          * Generate a key pair for all further communications with this person.
 151                          * We have a keypair for every contact, and a site key for unknown people.
 152                          * This provides a means to carry on relationships with other people if
 153                          * any single key is compromised. It is a robust key. We're much more
 154                          * worried about key leakage than anybody cracking it.
 155                          */
 156                         $res = Crypto::newKeypair(4096);
 157
 158                         $private_key = $res['prvkey'];
 159                         $public_key  = $res['pubkey'];
 160
 161                         // Save the private key. Send them the public key.
 162                         q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d",
 163                                 dbesc($private_key),
 164                                 intval($contact_id),
 165                                 intval($uid)
 166                         );
 167
 168                         $params = [];
 169
 170                         /*
 171                          * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
 172                          * site private key (person on the other end can decrypt it with our site public key).
 173                          * Then encrypt our profile URL with the other person's site public key. They can decrypt
 174                          * it with their site private key. If the decryption on the other end fails for either
 175                          * item, it indicates tampering or key failure on at least one site and we will not be
 176                          * able to provide a secure communication pathway.
 177                          *
 178                          * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
 179                          * or later) then we encrypt the personal public key we send them using AES-256-CBC and a
 180                          * random key which is encrypted with their site public key.
 181                          */
 182
 183                         $src_aes_key = openssl_random_pseudo_bytes(64);
 184
 185                         $result = '';
 186                         openssl_private_encrypt($dfrn_id, $result, $user['prvkey']);
 187
 188                         $params['dfrn_id'] = bin2hex($result);
 189                         $params['public_key'] = $public_key;
 190
 191                         $my_url = System::baseUrl() . '/profile/' . $user['nickname'];
 192
 193                         openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
 194                         $params['source_url'] = bin2hex($params['source_url']);
 195
 196                         if ($aes_allow && function_exists('openssl_encrypt')) {
 197                                 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
 198                                 $params['aes_key'] = bin2hex($params['aes_key']);
 199                                 $params['public_key'] = bin2hex(openssl_encrypt($public_key, 'AES-256-CBC', $src_aes_key));
 200                         }
 201
 202                         $params['dfrn_version'] = DFRN_PROTOCOL_VERSION;
 203                         if ($duplex == 1) {
 204                                 $params['duplex'] = 1;
 205                         }
 206
 207                         if ($user['page-flags'] == PAGE_COMMUNITY) {
 208                                 $params['page'] = 1;
 209                         }
 210
 211                         if ($user['page-flags'] == PAGE_PRVGROUP) {
 212                                 $params['page'] = 2;
 213                         }
 214
 215                         logger('Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params, true), LOGGER_DATA);
 216
 217                         /*
 218                          *
 219                          * POST all this stuff to the other site.
 220                          * Temporarily raise the network timeout to 120 seconds because the default 60
 221                          * doesn't always give the other side quite enough time to decrypt everything.
 222                          *
 223                          */
 224
 225                         $res = Network::post($dfrn_confirm, $params, null, $redirects, 120);
 226
 227                         logger(' Confirm: received data: ' . $res, LOGGER_DATA);
 228
 229                         // Now figure out what they responded. Try to be robust if the remote site is
 230                         // having difficulty and throwing up errors of some kind.
 231
 232                         $leading_junk = substr($res, 0, strpos($res, '<?xml'));
 233
 234                         $res = substr($res, strpos($res, '<?xml'));
 235                         if (!strlen($res)) {
 236                                 // No XML at all, this exchange is messed up really bad.
 237                                 // We shouldn't proceed, because the xml parser might choke,
 238                                 // and $status is going to be zero, which indicates success.
 239                                 // We can hardly call this a success.
 240                                 notice(L10n::t('Response from remote site was not understood.') . EOL);
 241                                 return;
 242                         }
 243
 244                         if (strlen($leading_junk) && Config::get('system', 'debugging')) {
 245                                 // This might be more common. Mixed error text and some XML.
 246                                 // If we're configured for debugging, show the text. Proceed in either case.
 247                                 notice(L10n::t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL);
 248                         }
 249
 250                         if (stristr($res, "<status") === false) {
 251                                 // wrong xml! stop here!
 252                                 notice(L10n::t('Unexpected response from remote site: ') . EOL . htmlspecialchars($res) . EOL);
 253                                 return;
 254                         }
 255
 256                         $xml = XML::parseString($res);
 257                         $status = (int) $xml->status;
 258                         $message = unxmlify($xml->message);   // human readable text of what may have gone wrong.
 259                         switch ($status) {
 260                                 case 0:
 261                                         info(L10n::t("Confirmation completed successfully.") . EOL);
 262                                         break;
 263                                 case 1:
 264                                         // birthday paradox - generate new dfrn-id and fall through.
 265                                         $new_dfrn_id = random_string();
 266                                         q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d",
 267                                                 dbesc($new_dfrn_id),
 268                                                 intval($contact_id),
 269                                                 intval($uid)
 270                                         );
 271
 272                                 case 2:
 273                                         notice(L10n::t("Temporary failure. Please wait and try again.") . EOL);
 274                                         break;
 275                                 case 3:
 276                                         notice(L10n::t("Introduction failed or was revoked.") . EOL);
 277                                         break;
 278                         }
 279
 280                         if (strlen($message)) {
 281                                 notice(L10n::t('Remote site reported: ') . $message . EOL);
 282                         }
 283
 284                         if (($status == 0) && $intro_id) {
 285                                 $intro = dba::selectFirst('intro', ['note'], ['id' => $intro_id]);
 286                                 if (DBM::is_result($intro)) {
 287                                         dba::update('contact', ['reason' => $intro['note']], ['id' => $contact_id]);
 288                                 }
 289
 290                                 // Success. Delete the notification.
 291                                 dba::delete('intro', ['id' => $intro_id]);
 292                         }
 293
 294                         if ($status != 0) {
 295                                 return;
 296                         }
 297                 }
 298
 299                 /*
 300                  * We have now established a relationship with the other site.
 301                  * Let's make our own personal copy of their profile photo so we don't have
 302                  * to always load it from their site.
 303                  *
 304                  * We will also update the contact record with the nature and scope of the relationship.
 305                  */
 306                 Contact::updateAvatar($contact['photo'], $uid, $contact_id);
 307
 308                 logger('dfrn_confirm: confirm - imported photos');
 309
 310                 if ($network === NETWORK_DFRN) {
 311                         $new_relation = CONTACT_IS_FOLLOWER;
 312                         if (($relation == CONTACT_IS_SHARING) || ($duplex)) {
 313                                 $new_relation = CONTACT_IS_FRIEND;
 314                         }
 315
 316                         if (($relation == CONTACT_IS_SHARING) && ($duplex)) {
 317                                 $duplex = 0;
 318                         }
 319
 320                         $r = q("UPDATE `contact` SET `rel` = %d,
 321                                 `name-date` = '%s',
 322                                 `uri-date` = '%s',
 323                                 `blocked` = 0,
 324                                 `pending` = 0,
 325                                 `duplex` = %d,
 326                                 `hidden` = %d,
 327                                 `network` = '%s' WHERE `id` = %d
 328                         ",
 329                                 intval($new_relation),
 330                                 dbesc(DateTimeFormat::utcNow()),
 331                                 dbesc(DateTimeFormat::utcNow()),
 332                                 intval($duplex),
 333                                 intval($hidden),
 334                                 dbesc(NETWORK_DFRN),
 335                                 intval($contact_id)
 336                         );
 337                 } else {
 338                         // $network !== NETWORK_DFRN
 339                         $network = defaults($contact, 'network', NETWORK_OSTATUS);
 340
 341                         $arr = Probe::uri($contact['url']);
 342
 343                         $notify  = defaults($contact, 'notify' , $arr['notify']);
 344                         $poll    = defaults($contact, 'poll'   , $arr['poll']);
 345
 346                         $addr = $arr['addr'];
 347
 348                         $new_relation = $contact['rel'];
 349                         $writable = $contact['writable'];
 350
 351                         if ($network === NETWORK_DIASPORA) {
 352                                 if ($duplex) {
 353                                         $new_relation = CONTACT_IS_FRIEND;
 354                                 } else {
 355                                         $new_relation = CONTACT_IS_FOLLOWER;
 356                                 }
 357
 358                                 if ($new_relation != CONTACT_IS_FOLLOWER) {
 359                                         $writable = 1;
 360                                 }
 361                         }
 362
 363                         dba::delete('intro', ['id' => $intro_id]);
 364
 365                         $r = q("UPDATE `contact` SET `name-date` = '%s',
 366                                 `uri-date` = '%s',
 367                                 `addr` = '%s',
 368                                 `notify` = '%s',
 369                                 `poll` = '%s',
 370                                 `blocked` = 0,
 371                                 `pending` = 0,
 372                                 `network` = '%s',
 373                                 `writable` = %d,
 374                                 `hidden` = %d,
 375                                 `rel` = %d
 376                                 WHERE `id` = %d
 377                         ",
 378                                 dbesc(DateTimeFormat::utcNow()),
 379                                 dbesc(DateTimeFormat::utcNow()),
 380                                 dbesc($addr),
 381                                 dbesc($notify),
 382                                 dbesc($poll),
 383                                 dbesc($network),
 384                                 intval($writable),
 385                                 intval($hidden),
 386                                 intval($new_relation),
 387                                 intval($contact_id)
 388                         );
 389                 }
 390
 391                 if (!DBM::is_result($r)) {
 392                         notice(L10n::t('Unable to set contact photo.') . EOL);
 393                 }
 394
 395                 // reload contact info
 396                 $contact = dba::selectFirst('contact', [], ['id' => $contact_id]);
 397                 if ((isset($new_relation) && $new_relation == CONTACT_IS_FRIEND)) {
 398                         if (DBM::is_result($contact) && ($contact['network'] === NETWORK_DIASPORA)) {
 399                                 $ret = Diaspora::sendShare($user, $contact);
 400                                 logger('share returns: ' . $ret);
 401                         }
 402                 }
 403
 404                 Group::addMember(User::getDefaultGroup($uid, $contact["network"]), $contact['id']);
 405
 406                 // Let's send our user to the contact editor in case they want to
 407                 // do anything special with this new friend.
 408                 if ($handsfree === null) {
 409                         goaway(System::baseUrl() . '/contacts/' . intval($contact_id));
 410                 } else {
 411                         return;
 412                 }
 413                 //NOTREACHED
 414         }
 415
 416         /*
 417          * End of Scenario 1. [Local confirmation of remote friend request].
 418          *
 419          * Begin Scenario 2. This is the remote response to the above scenario.
 420          * This will take place on the site that originally initiated the friend request.
 421          * In the section above where the confirming party makes a POST and
 422          * retrieves xml status information, they are communicating with the following code.
 423          */
 424         if (x($_POST, 'source_url')) {
 425                 // We are processing an external confirmation to an introduction created by our user.
 426                 $public_key =         defaults($_POST, 'public_key', '');
 427                 $dfrn_id    = hex2bin(defaults($_POST, 'dfrn_id'   , ''));
 428                 $source_url = hex2bin(defaults($_POST, 'source_url', ''));
 429                 $aes_key    =         defaults($_POST, 'aes_key'   , '');
 430                 $duplex     =  intval(defaults($_POST, 'duplex'    , 0));
 431                 $page       =  intval(defaults($_POST, 'page'      , 0));
 432
 433                 $forum = (($page == 1) ? 1 : 0);
 434                 $prv   = (($page == 2) ? 1 : 0);
 435
 436                 logger('dfrn_confirm: requestee contacted: ' . $node);
 437
 438                 logger('dfrn_confirm: request: POST=' . print_r($_POST, true), LOGGER_DATA);
 439
 440                 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
 441
 442                 if (x($aes_key)) {
 443                         $aes_key = hex2bin($aes_key);
 444                         $public_key = hex2bin($public_key);
 445                 }
 446
 447                 // Find our user's account
 448                 $user = dba::selectFirst('user', [], ['nickname' => $node]);
 449                 if (!DBM::is_result($user)) {
 450                         $message = L10n::t('No user record found for \'%s\' ', $node);
 451                         System::xmlExit(3, $message); // failure
 452                         // NOTREACHED
 453                 }
 454
 455                 $my_prvkey = $user['prvkey'];
 456                 $local_uid = $user['uid'];
 457
 458
 459                 if (!strstr($my_prvkey, 'PRIVATE KEY')) {
 460                         $message = L10n::t('Our site encryption key is apparently messed up.');
 461                         System::xmlExit(3, $message);
 462                 }
 463
 464                 // verify everything
 465
 466                 $decrypted_source_url = "";
 467                 openssl_private_decrypt($source_url, $decrypted_source_url, $my_prvkey);
 468
 469
 470                 if (!strlen($decrypted_source_url)) {
 471                         $message = L10n::t('Empty site URL was provided or URL could not be decrypted by us.');
 472                         System::xmlExit(3, $message);
 473                         // NOTREACHED
 474                 }
 475
 476                 $contact = dba::selectFirst('contact', [], ['url' => $decrypted_source_url, 'uid' => $local_uid]);
 477                 if (!DBM::is_result($contact)) {
 478                         if (strstr($decrypted_source_url, 'http:')) {
 479                                 $newurl = str_replace('http:', 'https:', $decrypted_source_url);
 480                         } else {
 481                                 $newurl = str_replace('https:', 'http:', $decrypted_source_url);
 482                         }
 483
 484                         $contact = dba::selectFirst('contact', [], ['url' => $newurl, 'uid' => $local_uid]);
 485                         if (!DBM::is_result($contact)) {
 486                                 // this is either a bogus confirmation (?) or we deleted the original introduction.
 487                                 $message = L10n::t('Contact record was not found for you on our site.');
 488                                 System::xmlExit(3, $message);
 489                                 return; // NOTREACHED
 490                         }
 491                 }
 492
 493                 $relation = $contact['rel'];
 494
 495                 // Decrypt all this stuff we just received
 496
 497                 $foreign_pubkey = $contact['site-pubkey'];
 498                 $dfrn_record = $contact['id'];
 499
 500                 if (!$foreign_pubkey) {
 501                         $message = L10n::t('Site public key not available in contact record for URL %s.', $decrypted_source_url);
 502                         System::xmlExit(3, $message);
 503                 }
 504
 505                 $decrypted_dfrn_id = "";
 506                 openssl_public_decrypt($dfrn_id, $decrypted_dfrn_id, $foreign_pubkey);
 507
 508                 if (strlen($aes_key)) {
 509                         $decrypted_aes_key = "";
 510                         openssl_private_decrypt($aes_key, $decrypted_aes_key, $my_prvkey);
 511                         $dfrn_pubkey = openssl_decrypt($public_key, 'AES-256-CBC', $decrypted_aes_key);
 512                 } else {
 513                         $dfrn_pubkey = $public_key;
 514                 }
 515
 516                 if (dba::exists('contact', ['dfrn-id' => $decrypted_dfrn_id])) {
 517                         $message = L10n::t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
 518                         System::xmlExit(1, $message); // Birthday paradox - duplicate dfrn-id
 519                         // NOTREACHED
 520                 }
 521
 522                 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d",
 523                         dbesc($decrypted_dfrn_id),
 524                         dbesc($dfrn_pubkey),
 525                         intval($dfrn_record)
 526                 );
 527                 if (!DBM::is_result($r)) {
 528                         $message = L10n::t('Unable to set your contact credentials on our system.');
 529                         System::xmlExit(3, $message);
 530                 }
 531
 532                 // It's possible that the other person also requested friendship.
 533                 // If it is a duplex relationship, ditch the issued-id if one exists.
 534
 535                 if ($duplex) {
 536                         q("UPDATE `contact` SET `issued-id` = '' WHERE `id` = %d",
 537                                 intval($dfrn_record)
 538                         );
 539                 }
 540
 541                 // We're good but now we have to scrape the profile photo and send notifications.
 542                 $contact = dba::selectFirst('contact', ['photo'], ['id' => $dfrn_record]);
 543                 if (DBM::is_result($contact)) {
 544                         $photo = $contact['photo'];
 545                 } else {
 546                         $photo = System::baseUrl() . '/images/person-175.jpg';
 547                 }
 548
 549                 Contact::updateAvatar($photo, $local_uid, $dfrn_record);
 550
 551                 logger('dfrn_confirm: request - photos imported');
 552
 553                 $new_relation = CONTACT_IS_SHARING;
 554                 if (($relation == CONTACT_IS_FOLLOWER) || ($duplex)) {
 555                         $new_relation = CONTACT_IS_FRIEND;
 556                 }
 557
 558                 if (($relation == CONTACT_IS_FOLLOWER) && ($duplex)) {
 559                         $duplex = 0;
 560                 }
 561
 562                 $r = q("UPDATE `contact` SET
 563                         `rel` = %d,
 564                         `name-date` = '%s',
 565                         `uri-date` = '%s',
 566                         `blocked` = 0,
 567                         `pending` = 0,
 568                         `duplex` = %d,
 569                         `forum` = %d,
 570                         `prv` = %d,
 571                         `network` = '%s' WHERE `id` = %d
 572                 ",
 573                         intval($new_relation),
 574                         dbesc(DateTimeFormat::utcNow()),
 575                         dbesc(DateTimeFormat::utcNow()),
 576                         intval($duplex),
 577                         intval($forum),
 578                         intval($prv),
 579                         dbesc(NETWORK_DFRN),
 580                         intval($dfrn_record)
 581                 );
 582                 if (!DBM::is_result($r)) {      // indicates schema is messed up or total db failure
 583                         $message = L10n::t('Unable to update your contact profile details on our system');
 584                         System::xmlExit(3, $message);
 585                 }
 586
 587                 // Otherwise everything seems to have worked and we are almost done. Yay!
 588                 // Send an email notification
 589
 590                 logger('dfrn_confirm: request: info updated');
 591
 592                 $combined = null;
 593                 $r = q("SELECT `contact`.*, `user`.*
 594                         FROM `contact`
 595                         LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 596                         WHERE `contact`.`id` = %d
 597                         LIMIT 1",
 598                         intval($dfrn_record)
 599                 );
 600                 if (DBM::is_result($r)) {
 601                         $combined = $r[0];
 602
 603                         if ($combined['notify-flags'] & NOTIFY_CONFIRM) {
 604                                 $mutual = ($new_relation == CONTACT_IS_FRIEND);
 605                                 notification([
 606                                         'type'         => NOTIFY_CONFIRM,
 607                                         'notify_flags' => $combined['notify-flags'],
 608                                         'language'     => $combined['language'],
 609                                         'to_name'      => $combined['username'],
 610                                         'to_email'     => $combined['email'],
 611                                         'uid'          => $combined['uid'],
 612                                         'link'         => System::baseUrl() . '/contacts/' . $dfrn_record,
 613                                         'source_name'  => ((strlen(stripslashes($combined['name']))) ? stripslashes($combined['name']) : L10n::t('[Name Withheld]')),
 614                                         'source_link'  => $combined['url'],
 615                                         'source_photo' => $combined['photo'],
 616                                         'verb'         => ($mutual?ACTIVITY_FRIEND:ACTIVITY_FOLLOW),
 617                                         'otype'        => 'intro'
 618                                 ]);
 619                         }
 620                 }
 621
 622                 System::xmlExit(0); // Success
 623                 return; // NOTREACHED
 624                 ////////////////////// End of this scenario ///////////////////////////////////////////////
 625         }
 626
 627         // somebody arrived here by mistake or they are fishing. Send them to the homepage.
 628         goaway(System::baseUrl());
 629         // NOTREACHED
 630 }