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