mod/dfrn_confirm.php

   1 <?php
   2
   3 /**
   4  * @file mod/dfrn_confirm.php
   5  * @brief Module: dfrn_confirm
   6  * Purpose: Friendship acceptance for DFRN contacts
   7  *.
   8  * There are two possible entry points and three scenarios.
   9  *.
  10  *   1. A form was submitted by our user approving a friendship that originated elsewhere.
  11  *      This may also be called from dfrn_request to automatically approve a friendship.
  12  *
  13  *   2. We may be the target or other side of the conversation to scenario 1, and will
  14  *      interact with that process on our own user's behalf.
  15  *.
  16  *  @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
  17  *    You also find a graphic which describes the confirmation process at
  18  *    https://github.com/friendica/friendica/blob/master/spec/dfrn2_contact_confirmation.png
  19  */
  20
  21 use Friendica\App;
  22 use Friendica\Core\System;
  23 use Friendica\Core\Worker;
  24 use Friendica\Network\Probe;
  25
  26 require_once 'include/enotify.php';
  27 require_once 'include/group.php';
  28
  29 function dfrn_confirm_post(App $a, $handsfree = null) {
  30
  31         if(is_array($handsfree)) {
  32
  33                 /*
  34                  * We were called directly from dfrn_request due to automatic friend acceptance.
  35                  * Any $_POST parameters we may require are supplied in the $handsfree array.
  36                  *
  37                  */
  38
  39                 $node = $handsfree['node'];
  40                 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
  41
  42         }
  43         else {
  44                 if($a->argc > 1)
  45                         $node = $a->argv[1];
  46         }
  47
  48                 /*
  49                  *
  50                  * Main entry point. Scenario 1. Our user received a friend request notification (perhaps
  51                  * from another site) and clicked 'Approve'.
  52                  * $POST['source_url'] is not set. If it is, it indicates Scenario 2.
  53                  *
  54                  * We may also have been called directly from dfrn_request ($handsfree != null) due to
  55                  * this being a page type which supports automatic friend acceptance. That is also Scenario 1
  56                  * since we are operating on behalf of our registered user to approve a friendship.
  57                  *
  58                  */
  59
  60         if(! x($_POST,'source_url')) {
  61
  62                 $uid = ((is_array($handsfree)) ? $handsfree['uid'] : local_user());
  63
  64                 if(! $uid) {
  65                         notice( t('Permission denied.') . EOL );
  66                         return;
  67                 }
  68
  69                 $user = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
  70                         intval($uid)
  71                 );
  72
  73                 if(! $user) {
  74                         notice( t('Profile not found.') . EOL );
  75                         return;
  76                 }
  77
  78
  79                 // These data elements may come from either the friend request notification form or $handsfree array.
  80
  81                 if(is_array($handsfree)) {
  82                         logger('Confirm in handsfree mode');
  83                         $dfrn_id   = $handsfree['dfrn_id'];
  84                         $intro_id  = $handsfree['intro_id'];
  85                         $duplex    = $handsfree['duplex'];
  86                         $hidden    = ((array_key_exists('hidden',$handsfree)) ? intval($handsfree['hidden']) : 0 );
  87                         $activity  = ((array_key_exists('activity',$handsfree)) ? intval($handsfree['activity']) : 0 );
  88                 }
  89                 else {
  90                         $dfrn_id  = ((x($_POST,'dfrn_id'))    ? notags(trim($_POST['dfrn_id'])) : "");
  91                         $intro_id = ((x($_POST,'intro_id'))   ? intval($_POST['intro_id'])      : 0 );
  92                         $duplex   = ((x($_POST,'duplex'))     ? intval($_POST['duplex'])        : 0 );
  93                         $cid      = ((x($_POST,'contact_id')) ? intval($_POST['contact_id'])    : 0 );
  94                         $hidden   = ((x($_POST,'hidden'))     ? intval($_POST['hidden'])        : 0 );
  95                         $activity = ((x($_POST,'activity'))   ? intval($_POST['activity'])      : 0 );
  96                 }
  97
  98                 /*
  99                  *
 100                  * Ensure that dfrn_id has precedence when we go to find the contact record.
 101                  * We only want to search based on contact id if there is no dfrn_id,
 102                  * e.g. for OStatus network followers.
 103                  *
 104                  */
 105
 106                 if(strlen($dfrn_id))
 107                         $cid = 0;
 108
 109                 logger('Confirming request for dfrn_id (issued) ' . $dfrn_id);
 110                 if($cid)
 111                         logger('Confirming follower with contact_id: ' . $cid);
 112
 113
 114                 /*
 115                  *
 116                  * The other person will have been issued an ID when they first requested friendship.
 117                  * Locate their record. At this time, their record will have both pending and blocked set to 1.
 118                  * There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
 119                  *
 120                  */
 121
 122                 $r = q("SELECT * FROM `contact` WHERE ( ( `issued-id` != '' AND `issued-id` = '%s' ) OR ( `id` = %d AND `id` != 0 ) ) AND `uid` = %d AND `duplex` = 0 LIMIT 1",
 123                         dbesc($dfrn_id),
 124                         intval($cid),
 125                         intval($uid)
 126                 );
 127
 128                 if (! dbm::is_result($r)) {
 129                         logger('Contact not found in DB.');
 130                         notice( t('Contact not found.') . EOL );
 131                         notice( t('This may occasionally happen if contact was requested by both persons and it has already been approved.') . EOL );
 132                         return;
 133                 }
 134
 135                 $contact = $r[0];
 136
 137                 $contact_id   = $contact['id'];
 138                 $relation     = $contact['rel'];
 139                 $site_pubkey  = $contact['site-pubkey'];
 140                 $dfrn_confirm = $contact['confirm'];
 141                 $aes_allow    = $contact['aes_allow'];
 142
 143                 $network = ((strlen($contact['issued-id'])) ? NETWORK_DFRN : NETWORK_OSTATUS);
 144
 145                 if($contact['network'])
 146                         $network = $contact['network'];
 147
 148                 if($network === NETWORK_DFRN) {
 149
 150                         /*
 151                          *
 152                          * Generate a key pair for all further communications with this person.
 153                          * We have a keypair for every contact, and a site key for unknown people.
 154                          * This provides a means to carry on relationships with other people if
 155                          * any single key is compromised. It is a robust key. We're much more
 156                          * worried about key leakage than anybody cracking it.
 157                          *
 158                          */
 159                         require_once 'include/crypto.php';
 160
 161                         $res = new_keypair(4096);
 162
 163
 164                         $private_key = $res['prvkey'];
 165                         $public_key  = $res['pubkey'];
 166
 167                         // Save the private key. Send them the public key.
 168
 169                         $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d",
 170                                 dbesc($private_key),
 171                                 intval($contact_id),
 172                                 intval($uid)
 173                         );
 174
 175                         $params = array();
 176
 177                         /*
 178                          *
 179                          * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
 180                          * site private key (person on the other end can decrypt it with our site public key).
 181                          * Then encrypt our profile URL with the other person's site public key. They can decrypt
 182                          * it with their site private key. If the decryption on the other end fails for either
 183                          * item, it indicates tampering or key failure on at least one site and we will not be
 184                          * able to provide a secure communication pathway.
 185                          *
 186                          * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
 187                          * or later) then we encrypt the personal public key we send them using AES-256-CBC and a
 188                          * random key which is encrypted with their site public key.
 189                          *
 190                          */
 191
 192                         $src_aes_key = openssl_random_pseudo_bytes(64);
 193
 194                         $result = '';
 195                         openssl_private_encrypt($dfrn_id, $result, $user[0]['prvkey']);
 196
 197                         $params['dfrn_id'] = bin2hex($result);
 198                         $params['public_key'] = $public_key;
 199
 200
 201                         $my_url = System::baseUrl() . '/profile/' . $user[0]['nickname'];
 202
 203                         openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
 204                         $params['source_url'] = bin2hex($params['source_url']);
 205
 206                         if($aes_allow && function_exists('openssl_encrypt')) {
 207                                 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
 208                                 $params['aes_key'] = bin2hex($params['aes_key']);
 209                                 $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
 210                         }
 211
 212                         $params['dfrn_version'] = DFRN_PROTOCOL_VERSION ;
 213                         if($duplex == 1)
 214                                 $params['duplex'] = 1;
 215
 216                         if($user[0]['page-flags'] == PAGE_COMMUNITY)
 217                                 $params['page'] = 1;
 218                         if($user[0]['page-flags'] == PAGE_PRVGROUP)
 219                                 $params['page'] = 2;
 220
 221                         logger('Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params,true), LOGGER_DATA);
 222
 223                         /*
 224                          *
 225                          * POST all this stuff to the other site.
 226                          * Temporarily raise the network timeout to 120 seconds because the default 60
 227                          * doesn't always give the other side quite enough time to decrypt everything.
 228                          *
 229                          */
 230
 231                         $res = post_url($dfrn_confirm, $params, null, $redirects, 120);
 232
 233                         logger(' Confirm: received data: ' . $res, LOGGER_DATA);
 234
 235                         // Now figure out what they responded. Try to be robust if the remote site is
 236                         // having difficulty and throwing up errors of some kind.
 237
 238                         $leading_junk = substr($res,0,strpos($res,'<?xml'));
 239
 240                         $res = substr($res,strpos($res,'<?xml'));
 241                         if(! strlen($res)) {
 242
 243                                         // No XML at all, this exchange is messed up really bad.
 244                                         // We shouldn't proceed, because the xml parser might choke,
 245                                         // and $status is going to be zero, which indicates success.
 246                                         // We can hardly call this a success.
 247
 248                                 notice( t('Response from remote site was not understood.') . EOL);
 249                                 return;
 250                         }
 251
 252                         if(strlen($leading_junk) && get_config('system','debugging')) {
 253
 254                                         // This might be more common. Mixed error text and some XML.
 255                                         // If we're configured for debugging, show the text. Proceed in either case.
 256
 257                                 notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
 258                         }
 259
 260                         if(stristr($res, "<status")===false) {
 261                                 // wrong xml! stop here!
 262                                 notice( t('Unexpected response from remote site: ') . EOL . htmlspecialchars($res) . EOL );
 263                                 return;
 264                         }
 265
 266                         $xml = parse_xml_string($res);
 267                         $status = (int) $xml->status;
 268                         $message = unxmlify($xml->message);   // human readable text of what may have gone wrong.
 269                         switch($status) {
 270                                 case 0:
 271                                         info( t("Confirmation completed successfully.") . EOL);
 272                                         if(strlen($message))
 273                                                 notice( t('Remote site reported: ') . $message . EOL);
 274                                         break;
 275                                 case 1:
 276                                         // birthday paradox - generate new dfrn-id and fall through.
 277                                         $new_dfrn_id = random_string();
 278                                         $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d",
 279                                                 dbesc($new_dfrn_id),
 280                                                 intval($contact_id),
 281                                                 intval($uid)
 282                                         );
 283
 284                                 case 2:
 285                                         notice( t("Temporary failure. Please wait and try again.") . EOL);
 286                                         if(strlen($message))
 287                                                 notice( t('Remote site reported: ') . $message . EOL);
 288                                         break;
 289
 290
 291                                 case 3:
 292                                         notice( t("Introduction failed or was revoked.") . EOL);
 293                                         if(strlen($message))
 294                                                 notice( t('Remote site reported: ') . $message . EOL);
 295                                         break;
 296                                 }
 297
 298                         if(($status == 0) && ($intro_id)) {
 299
 300                                 // Success. Delete the notification.
 301
 302                                 $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d",
 303                                         intval($intro_id),
 304                                         intval($uid)
 305                                 );
 306
 307                         }
 308
 309                         if($status != 0)
 310                                 return;
 311                 }
 312
 313
 314                 /*
 315                  *
 316                  * We have now established a relationship with the other site.
 317                  * Let's make our own personal copy of their profile photo so we don't have
 318                  * to always load it from their site.
 319                  *
 320                  * We will also update the contact record with the nature and scope of the relationship.
 321                  *
 322                  */
 323
 324                 require_once 'include/Photo.php';
 325
 326                 update_contact_avatar($contact['photo'],$uid,$contact_id);
 327
 328                 logger('dfrn_confirm: confirm - imported photos');
 329
 330                 if($network === NETWORK_DFRN) {
 331
 332                         $new_relation = CONTACT_IS_FOLLOWER;
 333                         if(($relation == CONTACT_IS_SHARING) || ($duplex))
 334                                 $new_relation = CONTACT_IS_FRIEND;
 335
 336                         if(($relation == CONTACT_IS_SHARING) && ($duplex))
 337                                 $duplex = 0;
 338
 339                         $r = q("UPDATE `contact` SET `rel` = %d,
 340                                 `name-date` = '%s',
 341                                 `uri-date` = '%s',
 342                                 `blocked` = 0,
 343                                 `pending` = 0,
 344                                 `duplex` = %d,
 345                                 `hidden` = %d,
 346                                 `network` = '%s' WHERE `id` = %d
 347                         ",
 348                                 intval($new_relation),
 349                                 dbesc(datetime_convert()),
 350                                 dbesc(datetime_convert()),
 351                                 intval($duplex),
 352                                 intval($hidden),
 353                                 dbesc(NETWORK_DFRN),
 354                                 intval($contact_id)
 355                         );
 356                 } else {
 357
 358                         // $network !== NETWORK_DFRN
 359
 360                         $network = (($contact['network']) ? $contact['network'] : NETWORK_OSTATUS);
 361                         $notify = (($contact['notify']) ? $contact['notify'] : '');
 362                         $poll   = (($contact['poll']) ? $contact['poll'] : '');
 363
 364                         $arr = Probe::uri($contact['url']);
 365                         if (empty($contact['notify'])) {
 366                                 $notify = $arr['notify'];
 367                         }
 368                         if (empty($contact['poll'])) {
 369                                 $poll = $arr['poll'];
 370                         }
 371
 372                         $addr = $arr['addr'];
 373
 374                         $new_relation = $contact['rel'];
 375                         $writable = $contact['writable'];
 376
 377                         if($network === NETWORK_DIASPORA) {
 378                                 if($duplex)
 379                                         $new_relation = CONTACT_IS_FRIEND;
 380                                 else
 381                                         $new_relation = CONTACT_IS_FOLLOWER;
 382
 383                                 if($new_relation != CONTACT_IS_FOLLOWER)
 384                                         $writable = 1;
 385                         }
 386
 387                         $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d",
 388                                 intval($intro_id),
 389                                 intval($uid)
 390                         );
 391
 392
 393                         $r = q("UPDATE `contact` SET `name-date` = '%s',
 394                                 `uri-date` = '%s',
 395                                 `addr` = '%s',
 396                                 `notify` = '%s',
 397                                 `poll` = '%s',
 398                                 `blocked` = 0,
 399                                 `pending` = 0,
 400                                 `network` = '%s',
 401                                 `writable` = %d,
 402                                 `hidden` = %d,
 403                                 `rel` = %d
 404                                 WHERE `id` = %d
 405                         ",
 406                                 dbesc(datetime_convert()),
 407                                 dbesc(datetime_convert()),
 408                                 dbesc($addr),
 409                                 dbesc($notify),
 410                                 dbesc($poll),
 411                                 dbesc($network),
 412                                 intval($writable),
 413                                 intval($hidden),
 414                                 intval($new_relation),
 415                                 intval($contact_id)
 416                         );
 417                 }
 418
 419                 /// @TODO is dbm::is_result() working here?
 420                 if ($r === false) {
 421                         notice( t('Unable to set contact photo.') . EOL);
 422                 }
 423
 424                 // reload contact info
 425
 426                 $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 427                         intval($contact_id)
 428                 );
 429                 if (dbm::is_result($r)) {
 430                         $contact = $r[0];
 431                 } else {
 432                         $contact = null;
 433                 }
 434
 435
 436                 if ((isset($new_relation) && $new_relation == CONTACT_IS_FRIEND)) {
 437
 438                         if (($contact) && ($contact['network'] === NETWORK_DIASPORA)) {
 439                                 require_once 'include/diaspora.php';
 440                                 $ret = Diaspora::send_share($user[0],$r[0]);
 441                                 logger('share returns: ' . $ret);
 442                         }
 443
 444                         // Send a new friend post if we are allowed to...
 445
 446                         $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
 447                                 intval($uid)
 448                         );
 449
 450                         if((dbm::is_result($r)) && ($r[0]['hide-friends'] == 0) && ($activity) && (! $hidden)) {
 451
 452                                 require_once 'include/items.php';
 453
 454                                 $self = q("SELECT * FROM `contact` WHERE `self` = 1 AND `uid` = %d LIMIT 1",
 455                                         intval($uid)
 456                                 );
 457
 458                                 if(count($self)) {
 459
 460                                         $arr = array();
 461                                         $arr['guid'] = get_guid(32);
 462                                         $arr['uri'] = $arr['parent-uri'] = item_new_uri($a->get_hostname(), $uid);
 463                                         $arr['uid'] = $uid;
 464                                         $arr['contact-id'] = $self[0]['id'];
 465                                         $arr['wall'] = 1;
 466                                         $arr['type'] = 'wall';
 467                                         $arr['gravity'] = 0;
 468                                         $arr['origin'] = 1;
 469                                         $arr['author-name'] = $arr['owner-name'] = $self[0]['name'];
 470                                         $arr['author-link'] = $arr['owner-link'] = $self[0]['url'];
 471                                         $arr['author-avatar'] = $arr['owner-avatar'] = $self[0]['thumb'];
 472
 473                                         $A = '[url=' . $self[0]['url'] . ']' . $self[0]['name'] . '[/url]';
 474                                         $APhoto = '[url=' . $self[0]['url'] . ']' . '[img]' . $self[0]['thumb'] . '[/img][/url]';
 475
 476                                         $B = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]';
 477                                         $BPhoto = '[url=' . $contact['url'] . ']' . '[img]' . $contact['thumb'] . '[/img][/url]';
 478
 479                                         $arr['verb'] = ACTIVITY_FRIEND;
 480                                         $arr['object-type'] = ACTIVITY_OBJ_PERSON;
 481                                         $arr['body'] =  sprintf( t('%1$s is now friends with %2$s'), $A, $B)."\n\n\n".$BPhoto;
 482
 483                                         $arr['object'] = '<object><type>' . ACTIVITY_OBJ_PERSON . '</type><title>' . $contact['name'] . '</title>'
 484                                                 . '<id>' . $contact['url'] . '/' . $contact['name'] . '</id>';
 485                                         $arr['object'] .= '<link>' . xmlify('<link rel="alternate" type="text/html" href="' . $contact['url'] . '" />' . "\n");
 486                                         $arr['object'] .= xmlify('<link rel="photo" type="image/jpeg" href="' . $contact['thumb'] . '" />' . "\n");
 487                                         $arr['object'] .= '</link></object>' . "\n";
 488
 489                                         $arr['last-child'] = 1;
 490
 491                                         $arr['allow_cid'] = $user[0]['allow_cid'];
 492                                         $arr['allow_gid'] = $user[0]['allow_gid'];
 493                                         $arr['deny_cid']  = $user[0]['deny_cid'];
 494                                         $arr['deny_gid']  = $user[0]['deny_gid'];
 495
 496                                         $i = item_store($arr);
 497                                         if($i)
 498                                                 Worker::add(PRIORITY_HIGH, "notifier", "activity", $i);
 499                                 }
 500                         }
 501                 }
 502
 503                 $def_gid = get_default_group($uid, $contact["network"]);
 504                 if($contact && intval($def_gid))
 505                         group_add_member($uid, '', $contact['id'], $def_gid);
 506
 507                 // Let's send our user to the contact editor in case they want to
 508                 // do anything special with this new friend.
 509
 510                 if ($handsfree === null) {
 511                         goaway(System::baseUrl() . '/contacts/' . intval($contact_id));
 512                 } else {
 513                         return;
 514                 }
 515                 //NOTREACHED
 516         }
 517
 518         /*
 519          *
 520          *
 521          * End of Scenario 1. [Local confirmation of remote friend request].
 522          *
 523          * Begin Scenario 2. This is the remote response to the above scenario.
 524          * This will take place on the site that originally initiated the friend request.
 525          * In the section above where the confirming party makes a POST and
 526          * retrieves xml status information, they are communicating with the following code.
 527          *
 528          */
 529
 530         if (x($_POST,'source_url')) {
 531
 532                 // We are processing an external confirmation to an introduction created by our user.
 533
 534                 $public_key = ((x($_POST,'public_key'))   ? $_POST['public_key']           : '');
 535                 $dfrn_id    = ((x($_POST,'dfrn_id'))      ? hex2bin($_POST['dfrn_id'])     : '');
 536                 $source_url = ((x($_POST,'source_url'))   ? hex2bin($_POST['source_url'])  : '');
 537                 $aes_key    = ((x($_POST,'aes_key'))      ? $_POST['aes_key']              : '');
 538                 $duplex     = ((x($_POST,'duplex'))       ? intval($_POST['duplex'])       : 0 );
 539                 $page       = ((x($_POST,'page'))         ? intval($_POST['page'])         : 0 );
 540                 $version_id = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 541
 542                 $forum = (($page == 1) ? 1 : 0);
 543                 $prv   = (($page == 2) ? 1 : 0);
 544
 545                 logger('dfrn_confirm: requestee contacted: ' . $node);
 546
 547                 logger('dfrn_confirm: request: POST=' . print_r($_POST,true), LOGGER_DATA);
 548
 549                 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
 550
 551                 if (x($aes_key)) {
 552                         $aes_key = hex2bin($aes_key);
 553                         $public_key = hex2bin($public_key);
 554                 }
 555
 556                 // Find our user's account
 557
 558                 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
 559                         dbesc($node));
 560
 561                 if (! dbm::is_result($r)) {
 562                         $message = sprintf(t('No user record found for \'%s\' '), $node);
 563                         xml_status(3,$message); // failure
 564                         // NOTREACHED
 565                 }
 566
 567                 $my_prvkey = $r[0]['prvkey'];
 568                 $local_uid = $r[0]['uid'];
 569
 570
 571                 if(! strstr($my_prvkey,'PRIVATE KEY')) {
 572                         $message = t('Our site encryption key is apparently messed up.');
 573                         xml_status(3,$message);
 574                 }
 575
 576                 // verify everything
 577
 578                 $decrypted_source_url = "";
 579                 openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);
 580
 581
 582                 if(! strlen($decrypted_source_url)) {
 583                         $message = t('Empty site URL was provided or URL could not be decrypted by us.');
 584                         xml_status(3,$message);
 585                         // NOTREACHED
 586                 }
 587
 588                 $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 589                         dbesc($decrypted_source_url),
 590                         intval($local_uid)
 591                 );
 592                 if (!dbm::is_result($ret)) {
 593                         if (strstr($decrypted_source_url,'http:')) {
 594                                 $newurl = str_replace('http:','https:',$decrypted_source_url);
 595                         } else {
 596                                 $newurl = str_replace('https:','http:',$decrypted_source_url);
 597                         }
 598
 599                         $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 600                                 dbesc($newurl),
 601                                 intval($local_uid)
 602                         );
 603                         if (!dbm::is_result($ret)) {
 604                                 // this is either a bogus confirmation (?) or we deleted the original introduction.
 605                                 $message = t('Contact record was not found for you on our site.');
 606                                 xml_status(3,$message);
 607                                 return; // NOTREACHED
 608                         }
 609                 }
 610
 611                 $relation = $ret[0]['rel'];
 612
 613                 // Decrypt all this stuff we just received
 614
 615                 $foreign_pubkey = $ret[0]['site-pubkey'];
 616                 $dfrn_record    = $ret[0]['id'];
 617
 618                 if (! $foreign_pubkey) {
 619                         $message = sprintf( t('Site public key not available in contact record for URL %s.'), $newurl);
 620                         xml_status(3,$message);
 621                 }
 622
 623                 $decrypted_dfrn_id = "";
 624                 openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);
 625
 626                 if (strlen($aes_key)) {
 627                         $decrypted_aes_key = "";
 628                         openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
 629                         $dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
 630                 }
 631                 else {
 632                         $dfrn_pubkey = $public_key;
 633                 }
 634
 635                 $r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
 636                         dbesc($decrypted_dfrn_id)
 637                 );
 638                 if (dbm::is_result($r)) {
 639                         $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
 640                         xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
 641                         // NOTREACHED
 642                 }
 643
 644                 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d",
 645                         dbesc($decrypted_dfrn_id),
 646                         dbesc($dfrn_pubkey),
 647                         intval($dfrn_record)
 648                 );
 649                 if (! dbm::is_result($r)) {
 650                         $message = t('Unable to set your contact credentials on our system.');
 651                         xml_status(3,$message);
 652                 }
 653
 654                 // It's possible that the other person also requested friendship.
 655                 // If it is a duplex relationship, ditch the issued-id if one exists.
 656
 657                 if($duplex) {
 658                         $r = q("UPDATE `contact` SET `issued-id` = '' WHERE `id` = %d",
 659                                 intval($dfrn_record)
 660                         );
 661                 }
 662
 663                 // We're good but now we have to scrape the profile photo and send notifications.
 664
 665
 666
 667                 $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
 668                         intval($dfrn_record));
 669
 670                 if (dbm::is_result($r)) {
 671                         $photo = $r[0]['photo'];
 672                 } else {
 673                         $photo = System::baseUrl() . '/images/person-175.jpg';
 674                 }
 675
 676                 require_once 'include/Photo.php';
 677
 678                 update_contact_avatar($photo,$local_uid,$dfrn_record);
 679
 680                 logger('dfrn_confirm: request - photos imported');
 681
 682                 $new_relation = CONTACT_IS_SHARING;
 683                 if (($relation == CONTACT_IS_FOLLOWER) || ($duplex)) {
 684                         $new_relation = CONTACT_IS_FRIEND;
 685                 }
 686
 687                 if (($relation == CONTACT_IS_FOLLOWER) && ($duplex)) {
 688                         $duplex = 0;
 689                 }
 690
 691                 $r = q("UPDATE `contact` SET
 692                         `rel` = %d,
 693                         `name-date` = '%s',
 694                         `uri-date` = '%s',
 695                         `blocked` = 0,
 696                         `pending` = 0,
 697                         `duplex` = %d,
 698                         `forum` = %d,
 699                         `prv` = %d,
 700                         `network` = '%s' WHERE `id` = %d
 701                 ",
 702                         intval($new_relation),
 703                         dbesc(datetime_convert()),
 704                         dbesc(datetime_convert()),
 705                         intval($duplex),
 706                         intval($forum),
 707                         intval($prv),
 708                         dbesc(NETWORK_DFRN),
 709                         intval($dfrn_record)
 710                 );
 711                 if ($r === false) {    // indicates schema is messed up or total db failure
 712                         $message = t('Unable to update your contact profile details on our system');
 713                         xml_status(3,$message);
 714                 }
 715
 716                 // Otherwise everything seems to have worked and we are almost done. Yay!
 717                 // Send an email notification
 718
 719                 logger('dfrn_confirm: request: info updated');
 720
 721                 $r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 722                         WHERE `contact`.`id` = %d LIMIT 1",
 723                         intval($dfrn_record)
 724                 );
 725
 726                 if (dbm::is_result($r))
 727                         $combined = $r[0];
 728
 729                 if((dbm::is_result($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
 730                         $mutual = ($new_relation == CONTACT_IS_FRIEND);
 731                         notification(array(
 732                                 'type'         => NOTIFY_CONFIRM,
 733                                 'notify_flags' => $r[0]['notify-flags'],
 734                                 'language'     => $r[0]['language'],
 735                                 'to_name'      => $r[0]['username'],
 736                                 'to_email'     => $r[0]['email'],
 737                                 'uid'          => $r[0]['uid'],
 738                                 'link'             => System::baseUrl() . '/contacts/' . $dfrn_record,
 739                                 'source_name'  => ((strlen(stripslashes($r[0]['name']))) ? stripslashes($r[0]['name']) : t('[Name Withheld]')),
 740                                 'source_link'  => $r[0]['url'],
 741                                 'source_photo' => $r[0]['photo'],
 742                                 'verb'         => ($mutual?ACTIVITY_FRIEND:ACTIVITY_FOLLOW),
 743                                 'otype'        => 'intro'
 744                         ));
 745                 }
 746
 747                 // Send a new friend post if we are allowed to...
 748
 749                 if($page && intval(get_pconfig($local_uid,'system','post_joingroup'))) {
 750                         $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
 751                                 intval($local_uid)
 752                         );
 753
 754                         if((dbm::is_result($r)) && ($r[0]['hide-friends'] == 0)) {
 755
 756                                 require_once 'include/items.php';
 757
 758                                 $self = q("SELECT * FROM `contact` WHERE `self` = 1 AND `uid` = %d LIMIT 1",
 759                                         intval($local_uid)
 760                                 );
 761
 762                                 if(count($self)) {
 763
 764                                         $arr = array();
 765                                         $arr['uri'] = $arr['parent-uri'] = item_new_uri($a->get_hostname(), $local_uid);
 766                                         $arr['uid'] = $local_uid;
 767                                         $arr['contact-id'] = $self[0]['id'];
 768                                         $arr['wall'] = 1;
 769                                         $arr['type'] = 'wall';
 770                                         $arr['gravity'] = 0;
 771                                         $arr['origin'] = 1;
 772                                         $arr['author-name'] = $arr['owner-name'] = $self[0]['name'];
 773                                         $arr['author-link'] = $arr['owner-link'] = $self[0]['url'];
 774                                         $arr['author-avatar'] = $arr['owner-avatar'] = $self[0]['thumb'];
 775
 776                                         $A = '[url=' . $self[0]['url'] . ']' . $self[0]['name'] . '[/url]';
 777                                         $APhoto = '[url=' . $self[0]['url'] . ']' . '[img]' . $self[0]['thumb'] . '[/img][/url]';
 778
 779                                         $B = '[url=' . $combined['url'] . ']' . $combined['name'] . '[/url]';
 780                                         $BPhoto = '[url=' . $combined['url'] . ']' . '[img]' . $combined['thumb'] . '[/img][/url]';
 781
 782                                         $arr['verb'] = ACTIVITY_JOIN;
 783                                         $arr['object-type'] = ACTIVITY_OBJ_GROUP;
 784                                         $arr['body'] =  sprintf( t('%1$s has joined %2$s'), $A, $B)."\n\n\n" .$BPhoto;
 785                                         $arr['object'] = '<object><type>' . ACTIVITY_OBJ_GROUP . '</type><title>' . $combined['name'] . '</title>'
 786                                                 . '<id>' . $combined['url'] . '/' . $combined['name'] . '</id>';
 787                                         $arr['object'] .= '<link>' . xmlify('<link rel="alternate" type="text/html" href="' . $combined['url'] . '" />' . "\n");
 788                                         $arr['object'] .= xmlify('<link rel="photo" type="image/jpeg" href="' . $combined['thumb'] . '" />' . "\n");
 789                                         $arr['object'] .= '</link></object>' . "\n";
 790
 791                                         $arr['last-child'] = 1;
 792
 793                                         $arr['allow_cid'] = $user[0]['allow_cid'];
 794                                         $arr['allow_gid'] = $user[0]['allow_gid'];
 795                                         $arr['deny_cid']  = $user[0]['deny_cid'];
 796                                         $arr['deny_gid']  = $user[0]['deny_gid'];
 797
 798                                         $i = item_store($arr);
 799                                         if($i)
 800                                                 Worker::add(PRIORITY_HIGH, "notifier", "activity", $i);
 801
 802                                 }
 803                         }
 804                 }
 805                 xml_status(0); // Success
 806                 return; // NOTREACHED
 807
 808                         ////////////////////// End of this scenario ///////////////////////////////////////////////
 809         }
 810
 811         // somebody arrived here by mistake or they are fishing. Send them to the homepage.
 812
 813         goaway(System::baseUrl());
 814         // NOTREACHED
 815
 816 }