// PayToAddrScript creates a new script to pay a transaction output to a the
// specified address.
func PayToAddrScript(addr btcutil.Address) ([]byte, error) {
switch addr := addr.(type) {
case *btcutil.AddressPubKeyHash:
if addr == nil {
return nil, ErrUnsupportedAddress
}
return payToPubKeyHashScript(addr.ScriptAddress())
case *btcutil.AddressScriptHash:
if addr == nil {
return nil, ErrUnsupportedAddress
}
return payToScriptHashScript(addr.ScriptAddress())
case *btcutil.AddressPubKey:
if addr == nil {
return nil, ErrUnsupportedAddress
}
return payToPubKeyScript(addr.ScriptAddress())
case *btcutil.AddressWitnessPubKeyHash:
if addr == nil {
return nil, ErrUnsupportedAddress
}
return payToWitnessPubKeyHashScript(addr.ScriptAddress())
case *btcutil.AddressWitnessScriptHash:
if addr == nil {
return nil, ErrUnsupportedAddress
}
return payToWitnessScriptHashScript(addr.ScriptAddress())
}
return nil, ErrUnsupportedAddress
}
// addrToKey converts known address types to an addrindex key. An error is
// returned for unsupported types.
func addrToKey(addr btcutil.Address) ([addrKeySize]byte, error) {
switch addr := addr.(type) {
case *btcutil.AddressPubKeyHash:
var result [addrKeySize]byte
result[0] = addrKeyTypePubKeyHash
copy(result[1:], addr.Hash160()[:])
return result, nil
case *btcutil.AddressScriptHash:
var result [addrKeySize]byte
result[0] = addrKeyTypeScriptHash
copy(result[1:], addr.Hash160()[:])
return result, nil
case *btcutil.AddressPubKey:
var result [addrKeySize]byte
result[0] = addrKeyTypePubKeyHash
copy(result[1:], addr.AddressPubKeyHash().Hash160()[:])
return result, nil
case *btcutil.AddressWitnessScriptHash:
var result [addrKeySize]byte
result[0] = addrKeyTypeWitnessScriptHash
// P2WSH outputs utilize a 32-byte data push created by hashing
// the script with sha256 instead of hash160. In order to keep
// all address entries within the database uniform and compact,
// we use a hash160 here to reduce the size of the salient data
// push to 20-bytes.
copy(result[1:], btcutil.Hash160(addr.ScriptAddress()))
return result, nil
case *btcutil.AddressWitnessPubKeyHash:
var result [addrKeySize]byte
result[0] = addrKeyTypeWitnessPubKeyHash
copy(result[1:], addr.Hash160()[:])
return result, nil
}
return [addrKeySize]byte{}, errUnsupportedAddressType
}
func (s *walletServer) NextAddress(ctx context.Context, req *pb.NextAddressRequest) (
*pb.NextAddressResponse, error) {
var (
addr btcutil.Address
err error
)
switch req.Kind {
case pb.NextAddressRequest_BIP0044_EXTERNAL:
addr, err = s.wallet.NewAddress(req.Account, waddrmgr.PubKeyHash)
case pb.NextAddressRequest_BIP0044_INTERNAL:
addr, err = s.wallet.NewChangeAddress(req.Account, waddrmgr.PubKeyHash)
default:
return nil, grpc.Errorf(codes.InvalidArgument, "kind=%v", req.Kind)
}
if err != nil {
return nil, translateError(err)
}
return &pb.NextAddressResponse{Address: addr.EncodeAddress()}, nil
}