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