Release v0.3.0

vendor/github.com/btcsuite/btcutil/psbt/creator.go

@@ -0,0 +1,63 @@
+// Copyright (c) 2018 The btcsuite developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+package psbt
+
+import (
+	"github.com/btcsuite/btcd/wire"
+)
+
+// MinTxVersion is the lowest transaction version that we'll permit.
+const MinTxVersion = 1
+
+// New on provision of an input and output 'skeleton' for the transaction, a
+// new partially populated PBST packet. The populated packet will include the
+// unsigned transaction, and the set of known inputs and outputs contained
+// within the unsigned transaction.  The values of nLockTime, nSequence (per
+// input) and transaction version (must be 1 of 2) must be specified here. Note
+// that the default nSequence value is wire.MaxTxInSequenceNum.  Referencing
+// the PSBT BIP, this function serves the roles of teh Creator.
+func New(inputs []*wire.OutPoint,
+	outputs []*wire.TxOut, version int32, nLockTime uint32,
+	nSequences []uint32) (*Packet, error) {
+
+	// Create the new struct; the input and output lists will be empty, the
+	// unsignedTx object must be constructed and serialized, and that
+	// serialization should be entered as the only entry for the
+	// globalKVPairs list.
+	//
+	// Ensure that the version of the transaction is greater then our
+	// minimum allowed transaction version. There must be one sequence
+	// number per input.
+	if version < MinTxVersion || len(nSequences) != len(inputs) {
+		return nil, ErrInvalidPsbtFormat
+	}
+
+	unsignedTx := wire.NewMsgTx(version)
+	unsignedTx.LockTime = nLockTime
+	for i, in := range inputs {
+		unsignedTx.AddTxIn(&wire.TxIn{
+			PreviousOutPoint: *in,
+			Sequence:         nSequences[i],
+		})
+	}
+	for _, out := range outputs {
+		unsignedTx.AddTxOut(out)
+	}
+
+	// The input and output lists are empty, but there is a list of those
+	// two lists, and each one must be of length matching the unsigned
+	// transaction; the unknown list can be nil.
+	pInputs := make([]PInput, len(unsignedTx.TxIn))
+	pOutputs := make([]POutput, len(unsignedTx.TxOut))
+
+	// This new Psbt is "raw" and contains no key-value fields, so sanity
+	// checking with c.Cpsbt.SanityCheck() is not required.
+	return &Packet{
+		UnsignedTx: unsignedTx,
+		Inputs:     pInputs,
+		Outputs:    pOutputs,
+		Unknowns:   nil,
+	}, nil
+}