139 lines
2.9 KiB
Go
139 lines
2.9 KiB
Go
package psbt
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import (
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"bytes"
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"io"
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"sort"
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"github.com/btcsuite/btcd/wire"
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)
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// POutput is a struct encapsulating all the data that can be attached
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// to any specific output of the PSBT.
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type POutput struct {
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RedeemScript []byte
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WitnessScript []byte
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Bip32Derivation []*Bip32Derivation
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}
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// NewPsbtOutput creates an instance of PsbtOutput; the three parameters
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// redeemScript, witnessScript and Bip32Derivation are all allowed to be
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// `nil`.
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func NewPsbtOutput(redeemScript []byte, witnessScript []byte,
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bip32Derivation []*Bip32Derivation) *POutput {
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return &POutput{
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RedeemScript: redeemScript,
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WitnessScript: witnessScript,
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Bip32Derivation: bip32Derivation,
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}
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}
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// deserialize attempts to recode a new POutput from the passed io.Reader.
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func (po *POutput) deserialize(r io.Reader) error {
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for {
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keyint, keydata, err := getKey(r)
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if err != nil {
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return err
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}
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if keyint == -1 {
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// Reached separator byte
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break
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}
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value, err := wire.ReadVarBytes(
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r, 0, MaxPsbtValueLength, "PSBT value",
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)
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if err != nil {
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return err
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}
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switch OutputType(keyint) {
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case RedeemScriptOutputType:
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if po.RedeemScript != nil {
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return ErrDuplicateKey
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}
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if keydata != nil {
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return ErrInvalidKeydata
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}
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po.RedeemScript = value
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case WitnessScriptOutputType:
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if po.WitnessScript != nil {
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return ErrDuplicateKey
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}
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if keydata != nil {
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return ErrInvalidKeydata
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}
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po.WitnessScript = value
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case Bip32DerivationOutputType:
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if !validatePubkey(keydata) {
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return ErrInvalidKeydata
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}
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master, derivationPath, err := readBip32Derivation(value)
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if err != nil {
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return err
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}
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// Duplicate keys are not allowed
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for _, x := range po.Bip32Derivation {
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if bytes.Equal(x.PubKey, keydata) {
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return ErrDuplicateKey
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}
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}
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po.Bip32Derivation = append(po.Bip32Derivation,
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&Bip32Derivation{
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PubKey: keydata,
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MasterKeyFingerprint: master,
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Bip32Path: derivationPath,
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},
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)
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default:
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// Unknown type is allowed for inputs but not outputs.
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return ErrInvalidPsbtFormat
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}
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}
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return nil
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}
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// serialize attempts to write out the target POutput into the passed
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// io.Writer.
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func (po *POutput) serialize(w io.Writer) error {
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if po.RedeemScript != nil {
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err := serializeKVPairWithType(
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w, uint8(RedeemScriptOutputType), nil, po.RedeemScript,
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)
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if err != nil {
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return err
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}
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}
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if po.WitnessScript != nil {
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err := serializeKVPairWithType(
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w, uint8(WitnessScriptOutputType), nil, po.WitnessScript,
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)
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if err != nil {
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return err
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}
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}
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sort.Sort(Bip32Sorter(po.Bip32Derivation))
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for _, kd := range po.Bip32Derivation {
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err := serializeKVPairWithType(w,
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uint8(Bip32DerivationOutputType),
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kd.PubKey,
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SerializeBIP32Derivation(
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kd.MasterKeyFingerprint,
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kd.Bip32Path,
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),
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)
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if err != nil {
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return err
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}
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}
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return nil
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}
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