ceremonyclient/go-libp2p/p2p/transport/webtransport/multiaddr.go

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package libp2pwebtransport
import (
"errors"
"fmt"
"net"
"strconv"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr/net"
"github.com/multiformats/go-multibase"
"github.com/multiformats/go-multihash"
)
var webtransportMA = ma.StringCast("/quic-v1/webtransport")
func toWebtransportMultiaddr(na net.Addr) (ma.Multiaddr, error) {
addr, err := manet.FromNetAddr(na)
if err != nil {
return nil, err
}
if _, err := addr.ValueForProtocol(ma.P_UDP); err != nil {
return nil, errors.New("not a UDP address")
}
return addr.Encapsulate(webtransportMA), nil
}
func stringToWebtransportMultiaddr(str string) (ma.Multiaddr, error) {
host, portStr, err := net.SplitHostPort(str)
if err != nil {
return nil, err
}
port, err := strconv.ParseInt(portStr, 10, 32)
if err != nil {
return nil, err
}
ip := net.ParseIP(host)
if ip == nil {
return nil, errors.New("failed to parse IP")
}
return toWebtransportMultiaddr(&net.UDPAddr{IP: ip, Port: int(port)})
}
func extractCertHashes(addr ma.Multiaddr) ([]multihash.DecodedMultihash, error) {
certHashesStr := make([]string, 0, 2)
ma.ForEach(addr, func(c ma.Component) bool {
if c.Protocol().Code == ma.P_CERTHASH {
certHashesStr = append(certHashesStr, c.Value())
}
return true
})
certHashes := make([]multihash.DecodedMultihash, 0, len(certHashesStr))
for _, s := range certHashesStr {
_, ch, err := multibase.Decode(s)
if err != nil {
return nil, fmt.Errorf("failed to multibase-decode certificate hash: %w", err)
}
dh, err := multihash.Decode(ch)
if err != nil {
return nil, fmt.Errorf("failed to multihash-decode certificate hash: %w", err)
}
certHashes = append(certHashes, *dh)
}
return certHashes, nil
}
func addrComponentForCert(hash []byte) (ma.Multiaddr, error) {
mh, err := multihash.Encode(hash, multihash.SHA2_256)
if err != nil {
return nil, err
}
certStr, err := multibase.Encode(multibase.Base58BTC, mh)
if err != nil {
return nil, err
}
return ma.NewComponent(ma.ProtocolWithCode(ma.P_CERTHASH).Name, certStr)
}
// IsWebtransportMultiaddr returns true if the given multiaddr is a well formed
// webtransport multiaddr. Returns the number of certhashes found.
func IsWebtransportMultiaddr(multiaddr ma.Multiaddr) (bool, int) {
const (
init = iota
foundUDP
foundQuicV1
foundWebTransport
)
state := init
certhashCount := 0
ma.ForEach(multiaddr, func(c ma.Component) bool {
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switch c.Protocol().Code {
case ma.P_UDP:
if state == init {
state = foundUDP
}
case ma.P_QUIC_V1:
if state == foundUDP {
state = foundQuicV1
}
case ma.P_WEBTRANSPORT:
if state == foundQuicV1 {
state = foundWebTransport
}
case ma.P_CERTHASH:
if state == foundWebTransport {
certhashCount++
}
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}
return true
})
return state == foundWebTransport, certhashCount
}