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