// AddrMatch returns the Multiaddrs that match the protocol stack on addr
func AddrMatch(match ma.Multiaddr, addrs []ma.Multiaddr) []ma.Multiaddr {
// we should match transports entirely.
p1s := match.Protocols()
out := make([]ma.Multiaddr, 0, len(addrs))
for _, a := range addrs {
p2s := a.Protocols()
if len(p1s) != len(p2s) {
continue
}
match := true
for i, p2 := range p2s {
if p1s[i].Code != p2.Code {
match = false
break
}
}
if match {
out = append(out, a)
}
}
return out
}
// IsThinWaist returns whether a Multiaddr starts with "Thin Waist" Protocols.
// This means: /{IP4, IP6}[/{TCP, UDP}]
func IsThinWaist(m ma.Multiaddr) bool {
p := m.Protocols()
// nothing? not even a waist.
if len(p) == 0 {
return false
}
if p[0].Code != ma.P_IP4 && p[0].Code != ma.P_IP6 {
return false
}
// only IP? still counts.
if len(p) == 1 {
return true
}
switch p[1].Code {
case ma.P_TCP, ma.P_UDP, ma.P_IP4, ma.P_IP6:
return true
default:
return false
}
}