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-rw-r--r--mod/receive.php215
1 files changed, 215 insertions, 0 deletions
diff --git a/mod/receive.php b/mod/receive.php
new file mode 100644
index 000000000..6e36109b3
--- /dev/null
+++ b/mod/receive.php
@@ -0,0 +1,215 @@
+<?php
+
+/**
+ * Diaspora endpoint
+ */
+
+
+
+require_once('include/salmon.php');
+require_once('library/simplepie/simplepie.inc');
+
+function receive_return($val) {
+
+ if($val >= 400)
+ $err = 'Error';
+ if($val >= 200 && $val < 300)
+ $err = 'OK';
+
+ logger('mod-diaspora returns ' . $val);
+ header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
+ killme();
+
+}
+
+function receive_post(&$a) {
+
+ if($a->argc != 3 || $a->argv[1] !== 'users')
+ receive_return(500);
+
+ $guid = $a->argv[2];
+
+ $r = q("SELECT * FROM `user` WHERE `guid` = '%s' LIMIT 1",
+ dbesc($guid)
+ );
+ if(! count($r))
+ salmon_return(500);
+
+ $importer = $r[0];
+
+ $xml = $_POST['xml'];
+
+ logger('mod-diaspora: new salmon ' . $xml, LOGGER_DATA);
+
+ if(! $xml)
+ receive_return(500);
+
+ // parse the xml
+
+ $dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
+
+ // figure out where in the DOM tree our data is hiding
+
+ if($dom->provenance->data)
+ $base = $dom->provenance;
+ elseif($dom->env->data)
+ $base = $dom->env;
+ elseif($dom->data)
+ $base = $dom;
+
+ if(! $base) {
+ logger('mod-diaspora: unable to locate salmon data in xml ');
+ receive_return(400);
+ }
+
+ // Stash the signature away for now. We have to find their key or it won't be good for anything.
+ $signature = base64url_decode($base->sig);
+
+ // unpack the data
+
+ // strip whitespace so our data element will return to one big base64 blob
+ $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
+
+ // stash away some other stuff for later
+
+ $type = $base->data[0]->attributes()->type[0];
+ $keyhash = $base->sig[0]->attributes()->keyhash[0];
+ $encoding = $base->encoding;
+ $alg = $base->alg;
+
+ $signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
+
+ // decode the data
+ $data = base64url_decode($data);
+
+ // Remove the xml declaration
+ $data = preg_replace('/\<\?xml[^\?].*\?\>/','',$data);
+
+ // Create a fake feed wrapper so simplepie doesn't choke
+
+ $tpl = get_markup_template('fake_feed.tpl');
+
+ $base = substr($data,strpos($data,'<entry'));
+
+ $feedxml = $tpl . $base . '</feed>';
+
+ logger('mod-diaspora: Processed feed: ' . $feedxml);
+
+ // Now parse it like a normal atom feed to scrape out the author URI
+
+ $feed = new SimplePie();
+ $feed->set_raw_data($feedxml);
+ $feed->enable_order_by_date(false);
+ $feed->init();
+
+ logger('mod-diaspora: Feed parsed.');
+
+ if($feed->get_item_quantity()) {
+ foreach($feed->get_items() as $item) {
+ $author = $item->get_author();
+ $author_link = unxmlify($author->get_link());
+ break;
+ }
+ }
+
+ if(! $author_link) {
+ logger('mod-diaspora: Could not retrieve author URI.');
+ receive_return(400);
+ }
+
+ // Once we have the author URI, go to the web and try to find their public key
+
+ logger('mod-salmon: Fetching key for ' . $author_link );
+
+
+ $key = get_salmon_key($author_link,$keyhash);
+
+ if(! $key) {
+ logger('mod-salmon: Could not retrieve author key.');
+ receive_return(400);
+ }
+
+ // Setup RSA stuff to verify the signature
+
+ set_include_path(get_include_path() . PATH_SEPARATOR . 'library' . PATH_SEPARATOR . 'phpsec');
+
+ require_once('library/phpsec/Crypt/RSA.php');
+
+ $key_info = explode('.',$key);
+
+ $m = base64url_decode($key_info[1]);
+ $e = base64url_decode($key_info[2]);
+
+ logger('mod-salmon: key details: ' . print_r($key_info,true));
+
+ $rsa = new CRYPT_RSA();
+ $rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
+ $rsa->setHash('sha256');
+
+ $rsa->modulus = new Math_BigInteger($m, 256);
+ $rsa->k = strlen($rsa->modulus->toBytes());
+ $rsa->exponent = new Math_BigInteger($e, 256);
+
+ $verify = $rsa->verify($signed_data,$signature);
+
+ if(! $verify) {
+ logger('mod-diaspora: Message did not verify. Discarding.');
+ receive_return(400);
+ }
+
+ logger('mod-diaspora: Message verified.');
+
+ /* decrypt the sucker */
+ /*
+ // TODO
+ */
+
+ /*
+ *
+ * If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
+ *
+ */
+
+ $r = q("SELECT * FROM `contact` WHERE `network` = 'dspr' AND ( `url` = '%s' OR `alias` = '%s')
+ AND `uid` = %d LIMIT 1",
+ dbesc($author_link),
+ dbesc($author_link),
+ intval($importer['uid'])
+ );
+ if(! count($r)) {
+ logger('mod-diaspora: Author unknown to us.');
+ }
+
+ // is this a follower? Or have we ignored the person?
+ // If so we can not accept this post.
+
+ if((count($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == REL_VIP) || ($r[0]['blocked']))) {
+ logger('mod-diaspora: Ignoring this author.');
+ receive_return(202);
+ // NOTREACHED
+ }
+
+ require_once('include/items.php');
+
+ // Placeholder for hub discovery. We shouldn't find any hubs
+ // since we supplied the fake feed header - and it doesn't have any.
+
+ $hub = '';
+
+ /**
+ *
+ * anti-spam measure: consume_feed will accept a follow activity from
+ * this person (and nothing else) if there is no existing contact record.
+ *
+ */
+
+ $contact_rec = ((count($r)) ? $r[0] : null);
+
+ consume_feed($feedxml,$importer,$contact_rec,$hub);
+
+ receive_return(200);
+}
+
+
+
+