+function dfrn_poll_content(&$a) {
+
+ $dfrn_id = ((x($_GET,'dfrn_id')) ? $_GET['dfrn_id'] : '');
+ $type = ((x($_GET,'type')) ? $_GET['type'] : 'data');
+ $last_update = ((x($_GET,'last_update')) ? $_GET['last_update'] : '');
+ $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url'] : '');
+ $sec = ((x($_GET,'sec')) ? $_GET['sec'] : '');
+ $dfrn_version = ((x($_GET,'dfrn_version')) ? (float) $_GET['dfrn_version'] : 2.0);
+ $perm = ((x($_GET,'perm')) ? $_GET['perm'] : 'r');
+
+ $direction = (-1);
+ if(strpos($dfrn_id,':') == 1) {
+ $direction = intval(substr($dfrn_id,0,1));
+ $dfrn_id = substr($dfrn_id,2);
+ }
+
+
+ if($dfrn_id != '') {
+ // initial communication from external contact
+ $hash = random_string();
+
+ $status = 0;
+
+ $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
+
+ if($type !== 'profile') {
+ $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
+ VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
+ dbesc($hash),
+ dbesc($dfrn_id),
+ intval(time() + 60 ),
+ dbesc($type),
+ dbesc($last_update)
+ );
+ }
+ $sql_extra = '';
+ switch($direction) {
+ case (-1):
+ if($type === 'profile')
+ $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
+ else
+ $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
+ $my_id = $dfrn_id;
+ break;
+ case 0:
+ $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+ $my_id = '1:' . $dfrn_id;
+ break;
+ case 1:
+ $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
+ $my_id = '0:' . $dfrn_id;
+ break;
+ default:
+ goaway(z_root());
+ break; // NOTREACHED
+ }
+
+ $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
+ FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
+ WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
+ AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
+ dbesc($a->argv[1])
+ );
+
+ if(count($r)) {
+
+ $challenge = '';
+ $encrypted_id = '';
+ $id_str = $my_id . '.' . mt_rand(1000,9999);
+
+ if($r[0]['duplex'] && strlen($r[0]['pubkey'])) {
+ openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
+ openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
+ }
+ else {
+ openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
+ openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
+ }
+
+ $challenge = bin2hex($challenge);
+ $encrypted_id = bin2hex($encrypted_id);
+ }
+ else {
+ $status = 1;
+ $challenge = '';
+ $encrypted_id = '';
+ }
+
+ if(($type === 'profile') && (strlen($sec))) {
+
+ // URL reply
+
+ if($dfrn_version < 2.2) {
+ $s = fetch_url($r[0]['poll']
+ . '?dfrn_id=' . $encrypted_id
+ . '&type=profile-check'
+ . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
+ . '&challenge=' . $challenge
+ . '&sec=' . $sec
+ );
+ }
+ else {
+ $s = post_url($r[0]['poll'], array(
+ 'dfrn_id' => $encrypted_id,
+ 'type' => 'profile-check',
+ 'dfrn_version' => DFRN_PROTOCOL_VERSION,
+ 'challenge' => $challenge,
+ 'sec' => $sec
+ ));
+ }
+
+ $profile = $r[0]['nickname'];
+
+ switch($destination_url) {
+ case 'profile':
+ $dest = $a->get_baseurl() . '/profile/' . $profile . '?tab=profile';
+ break;
+ case 'photos':
+ $dest = $a->get_baseurl() . '/photos/' . $profile;
+ break;
+ case 'status':
+ case '':
+ $dest = $a->get_baseurl() . '/profile/' . $profile;
+ break;
+ default:
+ $dest = $destination_url;
+ break;
+ }
+
+ logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
+
+ if(strlen($s) && strstr($s,'<?xml')) {
+
+ $xml = parse_xml_string($s);
+
+ logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);