mod/dfrn_notify.php

   1 <?php
   2
   3 require_once('simplepie/simplepie.inc');
   4 require_once('include/items.php');
   5 function dfrn_notify_post(&$a) {
   6
   7         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? notags(trim($_POST['dfrn_id']))   : '');
   8         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version']    : 2.0);
   9         $challenge    = ((x($_POST,'challenge'))    ? notags(trim($_POST['challenge'])) : '');
  10         $data         = ((x($_POST,'data'))         ? $_POST['data']                    : '');
  11         $key          = ((x($_POST,'key'))          ? $_POST['key']                     : '');
  12         $dissolve     = ((x($_POST,'dissolve'))     ? intval($_POST['dissolve'])        :  0);
  13
  14         $direction = (-1);
  15         if(strpos($dfrn_id,':') == 1) {
  16                 $direction = intval(substr($dfrn_id,0,1));
  17                 $dfrn_id = substr($dfrn_id,2);
  18         }
  19
  20         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
  21                 dbesc($dfrn_id),
  22                 dbesc($challenge)
  23         );
  24         if(! count($r)) {
  25                 logger('dfrn_notify: could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
  26                 xml_status(3);
  27         }
  28
  29         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
  30                 dbesc($dfrn_id),
  31                 dbesc($challenge)
  32         );
  33
  34         // find the local user who owns this relationship.
  35
  36         $sql_extra = '';
  37         switch($direction) {
  38                 case (-1):
  39                         $sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
  40                         break;
  41                 case 0:
  42                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  43                         break;
  44                 case 1:
  45                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  46                         break;
  47                 default:
  48                         xml_status(3);
  49                         break; // NOTREACHED
  50         }
  51
  52
  53         $r = q("SELECT  `contact`.*, `contact`.`uid` AS `importer_uid`,
  54                                         `contact`.`pubkey` AS `cpubkey`,
  55                                         `contact`.`prvkey` AS `cprvkey`,
  56                                         `contact`.`thumb` AS `thumb`,
  57                                         `contact`.`url` as `url`,
  58                                         `contact`.`name` as `senderName`,
  59                                         `user`.*
  60                         FROM `contact`
  61                         LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  62                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  63                                 AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  64                 dbesc($a->argv[1])
  65         );
  66
  67         if(! count($r)) {
  68                 logger('dfrn_notify: contact not found for dfrn_id ' . $dfrn_id);
  69                 xml_status(3);
  70                 //NOTREACHED
  71         }
  72
  73         // $importer in this case contains the contact record for the remote contact joined with the user record of our user.
  74
  75         $importer = $r[0];
  76
  77         logger('dfrn_notify: received notify from ' . $importer['name'] . ' for ' . $importer['username']);
  78         logger('dfrn_notify: data: ' . $data, LOGGER_DATA);
  79
  80         if($dissolve == 1) {
  81
  82                 /**
  83                  * Relationship is dissolved permanently
  84                  */
  85
  86                 require_once('include/Contact.php');
  87                 contact_remove($importer['id']);
  88                 logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
  89                 xml_status(0);
  90
  91         }
  92
  93         if(strlen($key)) {
  94                 $rawkey = hex2bin(trim($key));
  95                 logger('rino: md5 raw key: ' . md5($rawkey));
  96                 $final_key = '';
  97
  98                 if($dfrn_version >= 2.1) {
  99                         if((($importer['duplex']) && strlen($importer['cprvkey'])) || (! strlen($importer['cpubkey']))) {
 100                                 openssl_private_decrypt($rawkey,$final_key,$importer['cprvkey']);
 101                         }
 102                         else {
 103                                 openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);
 104                         }
 105                 }
 106                 else {
 107                         if((($importer['duplex']) && strlen($importer['cpubkey'])) || (! strlen($importer['cprvkey']))) {
 108                                 openssl_public_decrypt($rawkey,$final_key,$importer['cpubkey']);
 109                         }
 110                         else {
 111                                 openssl_private_decrypt($rawkey,$final_key,$importer['cprvkey']);
 112                         }
 113                 }
 114
 115                 logger('rino: received key : ' . $final_key);
 116                 $data = aes_decrypt(hex2bin($data),$final_key);
 117                 logger('rino: decrypted data: ' . $data, LOGGER_DATA);
 118         }
 119
 120
 121
 122
 123         if($importer['readonly']) {
 124                 // We aren't receiving stuff from this person. But we will quietly ignore them
 125                 // rather than a blatant "go away" message.
 126                 logger('dfrn_notify: ignoring');
 127                 xml_status(0);
 128                 //NOTREACHED
 129         }
 130
 131         // Consume notification feed. This may differ from consuming a public feed in several ways
 132         // - might contain email
 133         // - might contain remote followup to our message
 134         //              - in which case we need to accept it and then notify other conversants
 135         // - we may need to send various email notifications
 136
 137         $feed = new SimplePie();
 138         $feed->set_raw_data($data);
 139         $feed->enable_order_by_date(false);
 140         $feed->init();
 141
 142         $ismail = false;
 143
 144         $rawmail = $feed->get_feed_tags( NAMESPACE_DFRN, 'mail' );
 145         if(isset($rawmail[0]['child'][NAMESPACE_DFRN])) {
 146
 147                 logger('dfrn_notify: private message received');
 148
 149                 $ismail = true;
 150                 $base = $rawmail[0]['child'][NAMESPACE_DFRN];
 151
 152                 $msg = array();
 153                 $msg['uid'] = $importer['importer_uid'];
 154                 $msg['from-name'] = notags(unxmlify($base['sender'][0]['child'][NAMESPACE_DFRN]['name'][0]['data']));
 155                 $msg['from-photo'] = notags(unxmlify($base['sender'][0]['child'][NAMESPACE_DFRN]['avatar'][0]['data']));
 156                 $msg['from-url'] = notags(unxmlify($base['sender'][0]['child'][NAMESPACE_DFRN]['uri'][0]['data']));
 157                 $msg['contact-id'] = $importer['id'];
 158                 $msg['title'] = notags(unxmlify($base['subject'][0]['data']));
 159                 $msg['body'] = escape_tags(unxmlify($base['content'][0]['data']));
 160                 $msg['seen'] = 0;
 161                 $msg['replied'] = 0;
 162                 $msg['uri'] = notags(unxmlify($base['id'][0]['data']));
 163                 $msg['parent-uri'] = notags(unxmlify($base['in-reply-to'][0]['data']));
 164                 $msg['created'] = datetime_convert(notags(unxmlify('UTC','UTC',$base['sentdate'][0]['data'])));
 165
 166                 dbesc_array($msg);
 167
 168                 $r = dbq("INSERT INTO `mail` (`" . implode("`, `", array_keys($msg))
 169                         . "`) VALUES ('" . implode("', '", array_values($msg)) . "')" );
 170
 171                 // send email notification if requested.
 172
 173                 require_once('bbcode.php');
 174                 if($importer['notify-flags'] & NOTIFY_MAIL) {
 175
 176                         // name of the automated email sender
 177                         $msg['notificationfromname']    = t('Administrator');
 178                         // noreply address to send from
 179                         $msg['notificationfromemail']   = t('noreply') . '@' . $a->get_hostname();
 180
 181                         // text version
 182                         // process the message body to display properly in text mode
 183                         //              1) substitute a \n character for the "\" then "n", so it behaves properly (it doesn't come in as a \n character)
 184                         //              2) remove escape slashes
 185                         //              3) decode any bbcode from the message editor
 186                         //              4) decode any encoded html tags
 187                         //              5) remove html tags
 188                         $msg['textversion']
 189                                 = strip_tags(html_entity_decode(bbcode(stripslashes(str_replace(array("\\r\\n", "\\r", "\\n"), "\n",$msg['body']))),ENT_QUOTES,'UTF-8'));
 190
 191                         // html version
 192                         // process the message body to display properly in text mode
 193                         //              1) substitute a <br /> tag for the "\" then "n", so it behaves properly (it doesn't come in as a \n character)
 194                         //              2) remove escape slashes
 195                         //              3) decode any bbcode from the message editor
 196                         //              4) decode any encoded html tags
 197                         $msg['htmlversion']
 198                                 = html_entity_decode(bbcode(stripslashes(str_replace(array("\\r\\n", "\\r","\\n\\n" ,"\\n"), "<br />\n",$msg['body']))));
 199
 200                         // load the template for private message notifications
 201                         $tpl = load_view_file('view/mail_received_html_body_eml.tpl');
 202                         $email_html_body_tpl = replace_macros($tpl,array(
 203                                 '$siteName'             => $a->config['sitename'],                              // name of this site
 204                                 '$siteurl'              => $a->get_baseurl(),                                   // descriptive url of this site
 205                                 '$thumb'                => $importer['thumb'],                                  // thumbnail url for sender icon
 206                                 '$email'                => $importer['email'],                                  // email address to send to
 207                                 '$url'                  => $importer['url'],                                    // full url for the site
 208                                 '$from'                 => $msg['from-name'],                                   // name of the person sending the message
 209                                 '$title'                => stripslashes($msg['title']),                 // subject of the message
 210                                 '$htmlversion'  => $msg['htmlversion'],                                 // html version of the message
 211                                 '$mimeboundary' => $msg['mimeboundary'],                                // mime message divider
 212                                 '$hostname'             => $a->get_hostname()                                   // name of this host
 213                         ));
 214
 215                         // load the template for private message notifications
 216                         $tpl = load_view_file('view/mail_received_text_body_eml.tpl');
 217                         $email_text_body_tpl = replace_macros($tpl,array(
 218                                 '$siteName'             => $a->config['sitename'],                              // name of this site
 219                                 '$siteurl'              => $a->get_baseurl(),                                   // descriptive url of this site
 220                                 '$thumb'                => $importer['thumb'],                                  // thumbnail url for sender icon
 221                                 '$email'                => $importer['email'],                                  // email address to send to
 222                                 '$url'                  => $importer['url'],                                    // full url for the site
 223                                 '$from'                 => $msg['from-name'],                                   // name of the person sending the message
 224                                 '$title'                => stripslashes($msg['title']),                 // subject of the message
 225                                 '$textversion'  => $msg['textversion'],                                 // text version of the message
 226                                 '$mimeboundary' => $msg['mimeboundary'],                                // mime message divider
 227                                 '$hostname'             => $a->get_hostname()                                   // name of this host
 228                         ));
 229
 230                         // use the EmailNotification library to send the message
 231                         require_once("include/EmailNotification.php");
 232                         EmailNotification::sendTextHtmlEmail(
 233                                 $msg['notificationfromname'],
 234                                 $msg['notificationfromemail'],
 235                                 $msg['notificationfromemail'],
 236                                 $importer['email'],
 237                                 t('New mail received at ') . $a->config['sitename'],
 238                                 $email_html_body_tpl,
 239                                 $email_text_body_tpl
 240                         );
 241                 }
 242                 xml_status(0);
 243                 // NOTREACHED
 244         }
 245
 246         logger('dfrn_notify: feed item count = ' . $feed->get_item_quantity());
 247
 248         // process any deleted entries
 249
 250         $del_entries = $feed->get_feed_tags(NAMESPACE_TOMB, 'deleted-entry');
 251         if(is_array($del_entries) && count($del_entries)) {
 252                 foreach($del_entries as $dentry) {
 253                         $deleted = false;
 254                         if(isset($dentry['attribs']['']['ref'])) {
 255                                 $uri = $dentry['attribs']['']['ref'];
 256                                 $deleted = true;
 257                                 if(isset($dentry['attribs']['']['when'])) {
 258                                         $when = $dentry['attribs']['']['when'];
 259                                         $when = datetime_convert('UTC','UTC', $when, 'Y-m-d H:i:s');
 260                                 }
 261                                 else
 262                                         $when = datetime_convert('UTC','UTC','now','Y-m-d H:i:s');
 263                         }
 264                         if($deleted) {
 265                                 $r = q("SELECT * FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
 266                                         dbesc($uri),
 267                                         intval($importer['importer_uid'])
 268                                 );
 269                                 if(count($r)) {
 270                                         $item = $r[0];
 271
 272                                         if(! $item['deleted'])
 273                                                 logger('dfrn_notify: deleting item ' . $item['id'] . ' uri=' . $item['uri'], LOGGER_DEBUG);
 274
 275                                         if($item['uri'] == $item['parent-uri']) {
 276                                                 $r = q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s'
 277                                                         WHERE `parent-uri` = '%s' AND `uid` = %d",
 278                                                         dbesc($when),
 279                                                         dbesc(datetime_convert()),
 280                                                         dbesc($item['uri']),
 281                                                         intval($importer['importer_uid'])
 282                                                 );
 283                                         }
 284                                         else {
 285                                                 $r = q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s'
 286                                                         WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
 287                                                         dbesc($when),
 288                                                         dbesc(datetime_convert()),
 289                                                         dbesc($uri),
 290                                                         intval($importer['importer_uid'])
 291                                                 );
 292                                                 if($item['last-child']) {
 293                                                         // ensure that last-child is set in case the comment that had it just got wiped.
 294                                                         q("UPDATE `item` SET `last-child` = 0, `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d ",
 295                                                                 dbesc(datetime_convert()),
 296                                                                 dbesc($item['parent-uri']),
 297                                                                 intval($item['uid'])
 298                                                         );
 299                                                         // who is the last child now?
 300                                                         $r = q("SELECT `id` FROM `item` WHERE `parent-uri` = '%s' AND `type` != 'activity' AND `deleted` = 0 AND `uid` = %d
 301                                                                 ORDER BY `created` DESC LIMIT 1",
 302                                                                         dbesc($item['parent-uri']),
 303                                                                         intval($importer['importer_uid'])
 304                                                         );
 305                                                         if(count($r)) {
 306                                                                 q("UPDATE `item` SET `last-child` = 1 WHERE `id` = %d LIMIT 1",
 307                                                                         intval($r[0]['id'])
 308                                                                 );
 309                                                         }
 310                                                 }
 311                                         }
 312                                 }
 313                         }
 314                 }
 315         }
 316
 317
 318         foreach($feed->get_items() as $item) {
 319
 320                 $is_reply = false;
 321                 $item_id = $item->get_id();
 322                 $rawthread = $item->get_item_tags( NAMESPACE_THREAD, 'in-reply-to');
 323                 if(isset($rawthread[0]['attribs']['']['ref'])) {
 324                         $is_reply = true;
 325                         $parent_uri = $rawthread[0]['attribs']['']['ref'];
 326                 }
 327
 328                 if($is_reply) {
 329                         if($feed->get_item_quantity() == 1) {
 330                                 logger('dfrn_notify: received remote comment');
 331                                 $is_like = false;
 332                                 // remote reply to our post. Import and then notify everybody else.
 333                                 $datarray = get_atom_elements($feed,$item);
 334                                 $datarray['type'] = 'remote-comment';
 335                                 $datarray['wall'] = 1;
 336                                 $datarray['parent-uri'] = $parent_uri;
 337                                 $datarray['uid'] = $importer['importer_uid'];
 338                                 $datarray['contact-id'] = $importer['id'];
 339                                 if(($datarray['verb'] == ACTIVITY_LIKE) || ($datarray['verb'] == ACTIVITY_DISLIKE)) {
 340                                         $is_like = true;
 341                                         $datarray['type'] = 'activity';
 342                                         $datarray['gravity'] = GRAVITY_LIKE;
 343                                         $datarray['last-child'] = 0;
 344                                 }
 345                                 $posted_id = item_store($datarray);
 346                                 $parent = 0;
 347
 348                                 if($posted_id) {
 349                                         $r = q("SELECT `parent` FROM `item` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 350                                                 intval($posted_id),
 351                                                 intval($importer['importer_uid'])
 352                                         );
 353                                         if(count($r))
 354                                                 $parent = $r[0]['parent'];
 355
 356                                         if(! $is_like) {
 357                                                 $r1 = q("UPDATE `item` SET `last-child` = 0, `changed` = '%s' WHERE `uid` = %d AND `parent` = %d",
 358                                                         dbesc(datetime_convert()),
 359                                                         intval($importer['importer_uid']),
 360                                                         intval($r[0]['parent'])
 361                                                 );
 362
 363                                                 $r2 = q("UPDATE `item` SET `last-child` = 1, `changed` = '%s' WHERE `uid` = %d AND `id` = %d LIMIT 1",
 364                                                         dbesc(datetime_convert()),
 365                                                         intval($importer['importer_uid']),
 366                                                         intval($posted_id)
 367                                                 );
 368                                         }
 369
 370                                         if($posted_id && $parent) {
 371
 372                                                 $php_path = ((strlen($a->config['php_path'])) ? $a->config['php_path'] : 'php');
 373
 374                                                 proc_run($php_path,"include/notifier.php","comment-import","$posted_id");
 375
 376                                                 if((! $is_like) && ($importer['notify-flags'] & NOTIFY_COMMENT) && (! $importer['self'])) {
 377                                                         require_once('bbcode.php');
 378                                                         $from = stripslashes($datarray['author-name']);
 379                                                         $tpl = load_view_file('view/cmnt_received_eml.tpl');
 380                                                         $email_tpl = replace_macros($tpl, array(
 381                                                                 '$sitename' => $a->config['sitename'],
 382                                                                 '$siteurl' =>  $a->get_baseurl(),
 383                                                                 '$username' => $importer['username'],
 384                                                                 '$email' => $importer['email'],
 385                                                                 '$display' => $a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $posted_id,
 386                                                                 '$from' => $from,
 387                                                                 '$body' => html_entity_decode(strip_tags(bbcode(stripslashes($datarray['body']))), ENT_QUOTES, 'UTF-8')
 388                                                         ));
 389
 390                                                         $res = mail($importer['email'], $from . t(' commented on an item at ') . $a->config['sitename'],
 391                                                                 $email_tpl, "From: " . t('Administrator') . '@' . $a->get_hostname() );
 392                                                 }
 393                                         }
 394                                         xml_status(0);
 395                                         // NOTREACHED
 396                                 }
 397                         }
 398                         else {
 399                                 // regular comment that is part of this total conversation. Have we seen it? If not, import it.
 400
 401                                 $item_id = $item->get_id();
 402
 403                                 $r = q("SELECT `uid`, `last-child`, `edited` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
 404                                         dbesc($item_id),
 405                                         intval($importer['importer_uid'])
 406                                 );
 407                                 // FIXME update content if 'updated' changes
 408                                 if(count($r)) {
 409                                         $allow = $item->get_item_tags( NAMESPACE_DFRN, 'comment-allow');
 410                                         if($allow && $allow[0]['data'] != $r[0]['last-child']) {
 411                                                 $r = q("UPDATE `item` SET `last-child` = %d, `changed` = '%s' WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
 412                                                         intval($allow[0]['data']),
 413                                                         dbesc(datetime_convert()),
 414                                                         dbesc($item_id),
 415                                                         intval($importer['importer_uid'])
 416                                                 );
 417                                         }
 418                                         continue;
 419                                 }
 420                                 $datarray = get_atom_elements($feed,$item);
 421                                 $datarray['parent-uri'] = $parent_uri;
 422                                 $datarray['uid'] = $importer['importer_uid'];
 423                                 $datarray['contact-id'] = $importer['id'];
 424                                 if(($datarray['verb'] == ACTIVITY_LIKE) || ($datarray['verb'] == ACTIVITY_DISLIKE)) {
 425                                         $datarray['type'] = 'activity';
 426                                         $datarray['gravity'] = GRAVITY_LIKE;
 427                                 }
 428                                 $r = item_store($datarray);
 429
 430                                 // find out if our user is involved in this conversation and wants to be notified.
 431
 432                                 if(($datarray['type'] != 'activity') && ($importer['notify-flags'] & NOTIFY_COMMENT)) {
 433
 434                                         $myconv = q("SELECT `author-link` FROM `item` WHERE `parent-uri` = '%s' AND `uid` = %d AND `parent` != 0 ",
 435                                                 dbesc($parent_uri),
 436                                                 intval($importer['importer_uid'])
 437                                         );
 438                                         if(count($myconv)) {
 439                                                 $importer_url = $a->get_baseurl() . '/profile/' . $importer['nickname'];
 440                                                 foreach($myconv as $conv) {
 441                                                         if(! link_compare($conv['author-link'],$importer_url))
 442                                                                 continue;
 443                                                         require_once('bbcode.php');
 444                                                         $from = stripslashes($datarray['author-name']);
 445                                                         $tpl = load_view_file('view/cmnt_received_eml.tpl');
 446                                                         $email_tpl = replace_macros($tpl, array(
 447                                                                 '$sitename' => $a->config['sitename'],
 448                                                                 '$siteurl' =>  $a->get_baseurl(),
 449                                                                 '$username' => $importer['username'],
 450                                                                 '$email' => $importer['email'],
 451                                                                 '$from' => $from,
 452                                                                 '$display' => $a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $r,
 453                                                                 '$body' => html_entity_decode(strip_tags(bbcode(stripslashes($datarray['body']))), ENT_QUOTES, 'UTF-8')
 454                                                         ));
 455
 456                                                         $res = mail($importer['email'], $from . t(" commented on an item at ")
 457                                                                 . $a->config['sitename'],
 458                                                                 $email_tpl,t("From: Administrator@") . $a->get_hostname() );
 459                                                         break;
 460                                                 }
 461                                         }
 462                                 }
 463                                 continue;
 464                         }
 465                 }
 466                 else {
 467                         // Head post of a conversation. Have we seen it? If not, import it.
 468
 469                         $item_id = $item->get_id();
 470                         $r = q("SELECT `uid`, `last-child`, `edited` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
 471                                 dbesc($item_id),
 472                                 intval($importer['importer_uid'])
 473                         );
 474                         if(count($r)) {
 475                                 $allow = $item->get_item_tags( NAMESPACE_DFRN, 'comment-allow');
 476                                 if($allow && $allow[0]['data'] != $r[0]['last-child']) {
 477                                         $r = q("UPDATE `item` SET `last-child` = %d, `changed` = '%s' WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
 478                                                 intval($allow[0]['data']),
 479                                                 dbesc(datetime_convert()),
 480                                                 dbesc($item_id),
 481                                                 intval($importer['importer_uid'])
 482                                         );
 483                                 }
 484                                 continue;
 485                         }
 486
 487
 488                         $datarray = get_atom_elements($feed,$item);
 489                         $datarray['parent-uri'] = $item_id;
 490                         $datarray['uid'] = $importer['importer_uid'];
 491                         $datarray['contact-id'] = $importer['id'];
 492                         $r = item_store($datarray);
 493                         continue;
 494                 }
 495         }
 496
 497         xml_status(0);
 498         // NOTREACHED
 499
 500 }
 501
 502
 503 function dfrn_notify_content(&$a) {
 504
 505         if(x($_GET,'dfrn_id')) {
 506
 507                 // initial communication from external contact, $direction is their direction.
 508                 // If this is a duplex communication, ours will be the opposite.
 509
 510                 $dfrn_id = notags(trim($_GET['dfrn_id']));
 511                 $dfrn_version = (float) $_GET['dfrn_version'];
 512
 513                 logger('dfrn_notify: new notification dfrn_id=' . $dfrn_id);
 514
 515                 $direction = (-1);
 516                 if(strpos($dfrn_id,':') == 1) {
 517                         $direction = intval(substr($dfrn_id,0,1));
 518                         $dfrn_id = substr($dfrn_id,2);
 519                 }
 520
 521                 $hash = random_string();
 522
 523                 $status = 0;
 524
 525                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 526
 527                 $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` )
 528                         VALUES( '%s', '%s', %d ) ",
 529                         dbesc($hash),
 530                         dbesc($dfrn_id),
 531                         intval(time() + 90 )
 532                 );
 533
 534                 logger('dfrn_notify: challenge=' . $hash );
 535
 536                 $sql_extra = '';
 537                 switch($direction) {
 538                         case (-1):
 539                                 $sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
 540                                 $my_id = $dfrn_id;
 541                                 break;
 542                         case 0:
 543                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 544                                 $my_id = '1:' . $dfrn_id;
 545                                 break;
 546                         case 1:
 547                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 548                                 $my_id = '0:' . $dfrn_id;
 549                                 break;
 550                         default:
 551                                 $status = 1;
 552                                 break; // NOTREACHED
 553                 }
 554
 555                 $r = q("SELECT `contact`.*, `user`.`nickname` FROM `contact` LEFT JOIN `user` ON `user`.`uid` = `contact`.`uid`
 556                                 WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 557                                 dbesc($a->argv[1])
 558                 );
 559
 560                 if(! count($r))
 561                         $status = 1;
 562
 563                 $challenge = '';
 564                 $encrypted_id = '';
 565                 $id_str = $my_id . '.' . mt_rand(1000,9999);
 566
 567                 if((($r[0]['duplex']) && strlen($r[0]['prvkey'])) || (! strlen($r[0]['pubkey']))) {
 568                         openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 569                         openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 570                 }
 571                 else {
 572                         openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 573                         openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 574                 }
 575
 576                 $challenge    = bin2hex($challenge);
 577                 $encrypted_id = bin2hex($encrypted_id);
 578
 579                 $rino = ((function_exists('mcrypt_encrypt')) ? 1 : 0);
 580
 581                 $rino_enable = get_config('system','rino_encrypt');
 582
 583                 if(! $rino_enable)
 584                         $rino = 0;
 585
 586
 587                 header("Content-type: text/xml");
 588
 589                 echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 590                         . '<dfrn_notify>' . "\r\n"
 591                         . "\t" . '<status>' . $status . '</status>' . "\r\n"
 592                         . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 593                         . "\t" . '<rino>' . $rino . '</rino>' . "\r\n"
 594                         . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 595                         . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 596                         . '</dfrn_notify>' . "\r\n" ;
 597
 598                 killme();
 599         }
 600
 601 }