71 lines
2.4 KiB
Go
71 lines
2.4 KiB
Go
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// Copyright (c) 2018 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package psbt
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// The Creator has only one function:
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// takes a list of inputs and outputs and converts them to
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// the simplest Psbt, i.e. one with no data appended to inputs or outputs,
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// but only the raw unsigned transaction in the global section.
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import (
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"github.com/btcsuite/btcd/wire"
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)
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// Creator holds a reference to a created Psbt struct.
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type Creator struct {
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Cpsbt *Psbt
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}
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// CreatePsbt , on provision of an input and output 'skeleton' for
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// the transaction, returns a Creator struct.
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// Note that we require OutPoints and not TxIn structs, as we will
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// only populate the txid:n information, *not* any scriptSig/witness
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// information. The values of nLockTime, nSequence (per input) and
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// transaction version (must be 1 of 2) must be specified here. Note
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// that the default nSequence value is wire.MaxTxInSequenceNum.
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func (c *Creator) CreatePsbt(inputs []*wire.OutPoint,
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outputs []*wire.TxOut, Version int32, nLockTime uint32,
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nSequences []uint32) error {
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// Create the new struct; the input and output lists will be empty,
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// the unsignedTx object must be constructed and serialized,
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// and that serialization should be entered as the only entry for
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// the globalKVPairs list.
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// Check the version is a valid Bitcoin tx version; the nLockTime
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// can be any valid uint32. There must be one sequence number per
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// input.
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if !(Version == 1 || Version == 2) || len(nSequences) != len(inputs) {
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return ErrInvalidPsbtFormat
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}
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unsignedTx := wire.NewMsgTx(Version)
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unsignedTx.LockTime = nLockTime
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for i, in := range inputs {
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unsignedTx.AddTxIn(&wire.TxIn{
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PreviousOutPoint: *in,
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Sequence: nSequences[i],
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})
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}
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for _, out := range outputs {
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unsignedTx.AddTxOut(out)
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}
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// The input and output lists are empty, but there is a list of those
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// two lists, and each one must be of length matching the unsigned
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// transaction; the unknown list can be nil.
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pInputs := make([]PInput, len(unsignedTx.TxIn))
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pOutputs := make([]POutput, len(unsignedTx.TxOut))
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c.Cpsbt = &Psbt{
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UnsignedTx: unsignedTx,
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Inputs: pInputs,
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Outputs: pOutputs,
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Unknowns: nil,
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}
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// This new Psbt is "raw" and contains no key-value fields,
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// so sanity checking with c.Cpsbt.SanityCheck() is not required.
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return nil
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}
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