move lnadr from main to lndc package

lndc/lnadr.go

@@ -0,0 +1,92 @@
+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
+}