// MutateTransactionEnvelope for TransactionBuilder causes the underylying
// transaction to be set as the provided envelope's Tx field
func (m TransactionBuilder) MutateTransactionEnvelope(txe *xdr.TransactionEnvelope) error {
if m.Err != nil {
return m.Err
}
txe.Tx = m.TX
return nil
}
// MutateTransactionEnvelope adds a signature to the provided envelope
func (m Sign) MutateTransactionEnvelope(txe *xdr.TransactionEnvelope) error {
tb := TransactionBuilder{TX: txe.Tx}
hash, err := tb.Hash()
if err != nil {
return err
}
if m.Key == nil {
return errors.New("Invalid key")
}
sig := m.Key.Sign(hash[:])
ds := xdr.DecoratedSignature{
Hint: m.Key.Hint(),
Signature: xdr.Uint512(sig),
}
txe.Signatures = append(txe.Signatures, ds)
return nil
}