lnd.xprv/lndc/lnadr.go

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2016-01-17 21:45:07 +03:00
package lndc
import (
"encoding/hex"
"fmt"
"net"
"strings"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcutil"
)
// lnAddr...
type LNAdr struct {
lnId [16]byte // redundant because adr contains it
PubKey *btcec.PublicKey
Base58Addr btcutil.Address // Base58 encoded address (1XXX...)
NetAddr *net.TCPAddr // IP address
name string // human readable name? Not a thing yet.
endorsement []byte // a sig confirming the name? Not implemented
}
// String...
func (l *LNAdr) String() string {
var encodedId []byte
if l.PubKey == nil {
encodedId = l.Base58Addr.ScriptAddress()
} else {
encodedId = l.PubKey.SerializeCompressed()
}
return fmt.Sprintf("%v@%v", encodedId, l.NetAddr)
}
// newLnAddr...
func LnAddrFromString(encodedAddr string) (*LNAdr, error) {
// The format of an lnaddr is "<pubkey or pkh>@host"
idHost := strings.Split(encodedAddr, "@")
if len(idHost) != 2 {
return nil, fmt.Errorf("invalid format for lnaddr string: %v", encodedAddr)
}
// Attempt to resolve the IP address, this handles parsing IPv6 zones,
// and such.
fmt.Println("host: ", idHost[1])
ipAddr, err := net.ResolveTCPAddr("tcp", idHost[1])
if err != nil {
return nil, err
}
addr := &LNAdr{NetAddr: ipAddr}
idLen := len(idHost[0])
switch {
// Is the ID a hex-encoded compressed public key?
case idLen > 65 && idLen < 69:
pubkeyBytes, err := hex.DecodeString(idHost[0])
if err != nil {
return nil, err
}
addr.PubKey, err = btcec.ParsePubKey(pubkeyBytes, btcec.S256())
if err != nil {
return nil, err
}
// got pubey, populate address from pubkey
pkh := btcutil.Hash160(addr.PubKey.SerializeCompressed())
addr.Base58Addr, err = btcutil.NewAddressPubKeyHash(pkh,
&chaincfg.TestNet3Params)
if err != nil {
return nil, err
}
// Is the ID a string encoded bitcoin address?
case idLen > 33 && idLen < 37:
addr.Base58Addr, err = btcutil.DecodeAddress(idHost[0],
&chaincfg.TestNet3Params)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("invalid address %s", idHost[0])
}
// Finally, populate the lnid from the address.
copy(addr.lnId[:], addr.Base58Addr.ScriptAddress())
return addr, nil
}