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 . ' ' . $err);
22 function salmon_post(&$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",
35 http_status_exit(500);
41 $dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
43 // figure out where in the DOM tree our data is hiding
45 if($dom->provenance->data)
46 $base = $dom->provenance;
47 elseif($dom->env->data)
53 logger('mod-salmon: unable to locate salmon data in xml ');
54 http_status_exit(400);
57 // Stash the signature away for now. We have to find their key or it won't be good for anything.
60 $signature = base64url_decode($base->sig);
64 // strip whitespace so our data element will return to one big base64 blob
65 $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
67 // stash away some other stuff for later
69 $type = $base->data[0]->attributes()->type[0];
70 $keyhash = $base->sig[0]->attributes()->keyhash[0];
71 $encoding = $base->encoding;
74 // Salmon magic signatures have evolved and there is no way of knowing ahead of time which
75 // flavour we have. We'll try and verify it regardless.
77 $stnet_signed_data = $data;
79 $signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
81 $compliant_format = str_replace('=','',$signed_data);
85 $data = base64url_decode($data);
87 $author = ostatus::salmon_author($data,$importer);
88 $author_link = $author["author-link"];
91 logger('mod-salmon: Could not retrieve author URI.');
92 http_status_exit(400);
95 // Once we have the author URI, go to the web and try to find their public key
97 logger('mod-salmon: Fetching key for ' . $author_link);
99 $key = get_salmon_key($author_link,$keyhash);
102 logger('mod-salmon: Could not retrieve author key.');
103 http_status_exit(400);
106 $key_info = explode('.',$key);
108 $m = base64url_decode($key_info[1]);
109 $e = base64url_decode($key_info[2]);
111 logger('mod-salmon: key details: ' . print_r($key_info,true), LOGGER_DEBUG);
113 $pubkey = metopem($m,$e);
115 // We should have everything we need now. Let's see if it verifies.
117 $verify = rsa_verify($compliant_format,$signature,$pubkey);
120 logger('mod-salmon: message did not verify using protocol. Trying padding hack.');
121 $verify = rsa_verify($signed_data,$signature,$pubkey);
125 logger('mod-salmon: message did not verify using padding. Trying old statusnet hack.');
126 $verify = rsa_verify($stnet_signed_data,$signature,$pubkey);
130 logger('mod-salmon: Message did not verify. Discarding.');
131 http_status_exit(400);
134 logger('mod-salmon: Message verified.');
139 * If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
143 $r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
144 AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
145 AND `uid` = %d LIMIT 1",
146 dbesc(NETWORK_OSTATUS),
148 dbesc(normalise_link($author_link)),
150 dbesc(normalise_link($author_link)),
151 intval($importer['uid'])
154 logger('mod-salmon: Author unknown to us.');
155 if(get_pconfig($importer['uid'],'system','ostatus_autofriend')) {
156 $result = new_contact($importer['uid'],$author_link);
157 if($result['success']) {
158 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s')
159 AND `uid` = %d LIMIT 1",
160 dbesc(NETWORK_OSTATUS),
163 intval($importer['uid'])
169 // Have we ignored the person?
170 // If so we can not accept this post.
172 //if((count($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == CONTACT_IS_FOLLOWER) || ($r[0]['blocked']))) {
173 if(count($r) && $r[0]['blocked']) {
174 logger('mod-salmon: Ignoring this author.');
175 http_status_exit(202);
179 // Placeholder for hub discovery.
182 $contact_rec = ((count($r)) ? $r[0] : null);
184 ostatus::import($data,$importer,$contact_rec, $hub);
186 http_status_exit(200);