3 require_once('include/salmon.php');
4 require_once('include/ostatus.php');
5 require_once('include/crypto.php');
6 require_once('include/items.php');
7 require_once('include/follow.php');
9 function salmon_return($val) {
13 if($val >= 200 && $val < 300)
16 logger('mod-salmon returns ' . $val);
17 header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
22 function salmon_post(App $a) {
24 $xml = file_get_contents('php://input');
26 logger('mod-salmon: new salmon ' . $xml, LOGGER_DATA);
28 $nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
29 $mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
31 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
34 if (! dbm::is_result($r)) {
35 http_status_exit(500);
42 $dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
44 // figure out where in the DOM tree our data is hiding
46 if($dom->provenance->data)
47 $base = $dom->provenance;
48 elseif($dom->env->data)
54 logger('mod-salmon: unable to locate salmon data in xml ');
55 http_status_exit(400);
58 // Stash the signature away for now. We have to find their key or it won't be good for anything.
61 $signature = base64url_decode($base->sig);
65 // strip whitespace so our data element will return to one big base64 blob
66 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
68 // stash away some other stuff for later
70 $type = $base->data[0]->attributes()->type[0];
71 $keyhash = $base->sig[0]->attributes()->keyhash[0];
72 $encoding = $base->encoding;
75 // Salmon magic signatures have evolved and there is no way of knowing ahead of time which
76 // flavour we have. We'll try and verify it regardless.
78 $stnet_signed_data = $data;
80 $signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
82 $compliant_format = str_replace('=', '', $signed_data);
86 $data = base64url_decode($data);
88 $author = ostatus::salmon_author($data,$importer);
89 $author_link = $author["author-link"];
92 logger('mod-salmon: Could not retrieve author URI.');
93 http_status_exit(400);
96 // Once we have the author URI, go to the web and try to find their public key
98 logger('mod-salmon: Fetching key for ' . $author_link);
100 $key = get_salmon_key($author_link,$keyhash);
103 logger('mod-salmon: Could not retrieve author key.');
104 http_status_exit(400);
107 $key_info = explode('.',$key);
109 $m = base64url_decode($key_info[1]);
110 $e = base64url_decode($key_info[2]);
112 logger('mod-salmon: key details: ' . print_r($key_info,true), LOGGER_DEBUG);
114 $pubkey = metopem($m,$e);
116 // We should have everything we need now. Let's see if it verifies.
118 // Try GNU Social format
119 $verify = rsa_verify($signed_data, $signature, $pubkey);
123 logger('mod-salmon: message did not verify using protocol. Trying compliant format.');
124 $verify = rsa_verify($compliant_format, $signature, $pubkey);
129 logger('mod-salmon: message did not verify using padding. Trying old statusnet format.');
130 $verify = rsa_verify($stnet_signed_data, $signature, $pubkey);
135 logger('mod-salmon: Message did not verify. Discarding.');
136 http_status_exit(400);
139 logger('mod-salmon: Message verified with mode '.$mode);
144 * If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
148 $r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
149 AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
150 AND `uid` = %d LIMIT 1",
151 dbesc(NETWORK_OSTATUS),
153 dbesc(normalise_link($author_link)),
155 dbesc(normalise_link($author_link)),
156 intval($importer['uid'])
158 if (! dbm::is_result($r)) {
159 logger('mod-salmon: Author unknown to us.');
160 if(get_pconfig($importer['uid'],'system','ostatus_autofriend')) {
161 $result = new_contact($importer['uid'],$author_link);
162 if($result['success']) {
163 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s')
164 AND `uid` = %d LIMIT 1",
165 dbesc(NETWORK_OSTATUS),
168 intval($importer['uid'])
174 // Have we ignored the person?
175 // If so we can not accept this post.
177 //if((dbm::is_result($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == CONTACT_IS_FOLLOWER) || ($r[0]['blocked']))) {
178 if (dbm::is_result($r) && $r[0]['blocked']) {
179 logger('mod-salmon: Ignoring this author.');
180 http_status_exit(202);
184 // Placeholder for hub discovery.
187 $contact_rec = ((dbm::is_result($r)) ? $r[0] : null);
189 ostatus::import($data,$importer,$contact_rec, $hub);
191 http_status_exit(200);