73 lines
2.4 KiB
Go
73 lines
2.4 KiB
Go
package lnwallet
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import (
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"fmt"
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"github.com/roasbeef/btcd/txscript"
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"github.com/roasbeef/btcd/wire"
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)
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// WitnessType determines how an output's witness will be generated. The
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// default commitmentTimeLock type will generate a witness that will allow
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// spending of a time-locked transaction enforced by CheckSequenceVerify.
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type WitnessType uint16
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const (
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// CommitmentTimeLock is a witness that allows us to spend the output of a
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// commitment transaction after a relative lock-time lockout.
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CommitmentTimeLock WitnessType = 0
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// CommitmentNoDelay is a witness that allows us to spend a settled no-delay
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// output immediately on a counterparty's commitment transaction.
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CommitmentNoDelay WitnessType = 1
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// CommitmentRevoke is a witness that allows us to sweep the settled output
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// of a malicious counterparty's who broadcasts a revoked commitment
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// transaction.
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CommitmentRevoke WitnessType = 2
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// HtlcOfferedRevoke is a witness that allows us to sweep an HTLC
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// output that we offered to the counterparty.
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HtlcOfferedRevoke WitnessType = 3
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// HtlcAcceptedRevoke is a witness that allows us to sweep an HTLC
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// output that we accepted from the counterparty.
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HtlcAcceptedRevoke WitnessType = 4
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)
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// WitnessGenerator represents a function which is able to generate the final
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// witness for a particular public key script. This function acts as an
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// abstraction layer, hiding the details of the underlying script.
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type WitnessGenerator func(tx *wire.MsgTx, hc *txscript.TxSigHashes,
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inputIndex int) ([][]byte, error)
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// GenWitnessFunc will return a WitnessGenerator function that an output
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// uses to generate the witness for a sweep transaction.
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func (wt WitnessType) GenWitnessFunc(signer Signer,
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descriptor *SignDescriptor) WitnessGenerator {
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return func(tx *wire.MsgTx, hc *txscript.TxSigHashes,
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inputIndex int) ([][]byte, error) {
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desc := descriptor
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desc.SigHashes = hc
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desc.InputIndex = inputIndex
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switch wt {
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case CommitmentTimeLock:
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return CommitSpendTimeout(signer, desc, tx)
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case CommitmentNoDelay:
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return CommitSpendNoDelay(signer, desc, tx)
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case CommitmentRevoke:
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return CommitSpendRevoke(signer, desc, tx)
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case HtlcOfferedRevoke:
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return ReceiverHtlcSpendRevoke(signer, desc, tx)
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case HtlcAcceptedRevoke:
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return SenderHtlcSpendRevoke(signer, desc, tx)
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default:
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return nil, fmt.Errorf("unknown witness type: %v", wt)
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}
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}
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}
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