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The account manager is a subsystem of the client that will be responsible for management of all CLM accounts on-chain. This initial version only supports opening accounts at the moment, but this will be extended later on to also support closing and modifying them. Open accounts are also watched for their confirmation and spend, though the spend path remains unhandled. The commit stands alone by itself, and is not yet integrated into the server as we still need to satisfy its dependencies, which we'll do in the following commits.
70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package clmscript
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import (
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"bytes"
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"github.com/btcsuite/btcd/txscript"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/keychain"
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)
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const (
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// AccountKeyFamily is the key family used to derive keys which will be
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// used in the 2 of 2 multi-sig construction of a CLM account.
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//
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// TODO(wilmer): decide on actual value.
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AccountKeyFamily keychain.KeyFamily = 220
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)
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// AccountScript returns the witness script of an account on-chain.
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//
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// OP_IF
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// <account expiry>
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// OP_CHECKLOCKTIMEVERIFY
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// OP_DROP
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// <trader key>
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// OP_CHECKSIG
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// OP_ELSE
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// OP_2 <trader key> <auctioneer key> OP_2
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// OP_CHECKMULTISIG
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// OP_ENDIF
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func AccountScript(expiry uint32, traderKey, auctioneerKey [33]byte) ([]byte, error) {
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builder := txscript.NewScriptBuilder()
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builder.AddOp(txscript.OP_IF)
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builder.AddInt64(int64(expiry))
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builder.AddOp(txscript.OP_CHECKLOCKTIMEVERIFY)
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builder.AddOp(txscript.OP_DROP)
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builder.AddData(traderKey[:])
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builder.AddOp(txscript.OP_CHECKSIG)
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builder.AddOp(txscript.OP_ELSE)
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builder.AddOp(txscript.OP_2)
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builder.AddData(traderKey[:])
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builder.AddData(auctioneerKey[:])
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builder.AddOp(txscript.OP_2)
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builder.AddOp(txscript.OP_CHECKMULTISIG)
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builder.AddOp(txscript.OP_ENDIF)
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script, err := builder.Script()
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if err != nil {
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return nil, err
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}
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return input.WitnessScriptHash(script)
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}
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// LocateOutputScript determines whether a transaction includes an output with a
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// specific script. If it does, the output index is returned.
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func LocateOutputScript(tx *wire.MsgTx, script []byte) (uint32, bool) {
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for i, txOut := range tx.TxOut {
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if !bytes.Equal(txOut.PkScript, script) {
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continue
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}
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return uint32(i), true
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}
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return 0, false
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}
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