fix: make certhashes optional in WebTransport addresses (#26)

Allow certhashes to be optional. The connection may fail, or it may
not be necessary to use certhashes, for example if the remote has
configured a trusted SSL certificate.

Author: achingbrain

src/index.ts

@@ -544,7 +544,7 @@ const _WebRTCDirect = and(TCP_OR_UDP, literal('webrtc-direct'), certhash(), opti
  */
 export const WebRTCDirect = fmt(_WebRTCDirect)
 
-const _WebTransport = and(_QUICV1, literal('webtransport'), certhash(), certhash(), optional(peerId()))
+const _WebTransport = and(_QUICV1, literal('webtransport'), optional(certhash()), optional(certhash()), optional(peerId()))
 
 /**
  * Matches WebTransport addresses.

test/index.spec.ts

@@ -223,6 +223,8 @@ describe('multiaddr matcher', () => {
   ]
 
   const goodWebTransport = [
+    '/ip4/10.5.0.2/udp/4001/quic-v1/webtransport',
+    '/ip4/10.5.0.2/udp/4001/quic-v1/webtransport/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v',
     '/ip4/10.5.0.2/udp/4001/quic-v1/webtransport/certhash/uEiDWmsTxXe55Mbwnvd1qrPZAcE5Jtc0tE9WtGXD_NpMERg/certhash/uEiCoik2HBeT5oc9Jib3SQJzNjn9AnznMDpQWcOeKSuEc9A/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v',
     '/ip4/127.0.0.1/udp/4001/quic-v1/webtransport/certhash/uEiDWmsTxXe55Mbwnvd1qrPZAcE5Jtc0tE9WtGXD_NpMERg/certhash/uEiCoik2HBeT5oc9Jib3SQJzNjn9AnznMDpQWcOeKSuEc9A/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v',
     '/ip4/97.126.16.119/udp/4001/quic-v1/webtransport/certhash/uEiDWmsTxXe55Mbwnvd1qrPZAcE5Jtc0tE9WtGXD_NpMERg/certhash/uEiCoik2HBeT5oc9Jib3SQJzNjn9AnznMDpQWcOeKSuEc9A/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v',
@@ -231,11 +233,7 @@ describe('multiaddr matcher', () => {
 
   const badWebTransport = [
     // quic instead of quic-v1
-    '/ip4/10.5.0.2/udp/4001/quic/webtransport/certhash/uEiDWmsTxXe55Mbwnvd1qrPZAcE5Jtc0tE9WtGXD_NpMERg/certhash/uEiCoik2HBeT5oc9Jib3SQJzNjn9AnznMDpQWcOeKSuEc9A/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v',
-    // missing second certhash
-    '/ip4/10.5.0.2/udp/4001/quic-v1/webtransport/certhash/uEiDWmsTxXe55Mbwnvd1qrPZAcE5Jtc0tE9WtGXD_NpMERg/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v',
-    // missing webtransport/certhash base
-    '/ip4/10.5.0.2/udp/4001/quic-v1/webtransport/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v'
+    '/ip4/10.5.0.2/udp/4001/quic/webtransport/certhash/uEiDWmsTxXe55Mbwnvd1qrPZAcE5Jtc0tE9WtGXD_NpMERg/certhash/uEiCoik2HBeT5oc9Jib3SQJzNjn9AnznMDpQWcOeKSuEc9A/p2p/12D3KooWQF6Q3i1QkziJQ9mkNNcyFD8GPQz6R6oEvT75wgsVXm4v'
   ]
 
   const exactIPorDomain = [