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CashUtils.generateSpend: add anonymous flag, default to true (#5048)

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cxyzhang0 2019-04-26 01:57:32 -07:00 committed by Shams Asari
parent 45b2d06936
commit b37c422ff7
1 changed files with 17 additions and 8 deletions
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25
finance/workflows/src/main/kotlin/net/corda/finance/workflows/asset/CashUtils.kt
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@ -56,10 +56,13 @@ object CashUtils {
* to move the cash will be added on top.
* @param amount How much currency to send.
* @param to the recipient party.
* @param ourIdentity well known identity to create a new confidential identity from, for sending change to.
* @param ourIdentity ourIdentity is used to determine the where the change will be sent.
* If anonymous is true then an anonymous identity will be generated from this and the change
* will be spent to that, otherwise ourIdentity will be used as is.
* @param onlyFromParties if non-null, the asset states will be filtered to only include those issued by the set
* of given parties. This can be useful if the party you're trying to pay has expectations
* about which type of asset claims they are willing to accept.
* @param anonymous whether or not to use CI to send the change to
* @return A [Pair] of the same transaction builder passed in as [tx], and the list of keys that need to sign
* the resulting transaction for it to be valid.
* @throws InsufficientBalanceException when a cash spending transaction fails because
@ -73,8 +76,9 @@ object CashUtils {
amount: Amount<Currency>,
ourIdentity: PartyAndCertificate,
to: AbstractParty,
onlyFromParties: Set<AbstractParty> = emptySet()): Pair<TransactionBuilder, List<PublicKey>> {
return generateSpend(services, tx, listOf(PartyAndAmount(to, amount)), ourIdentity, onlyFromParties)
onlyFromParties: Set<AbstractParty> = emptySet(),
anonymous: Boolean = true): Pair<TransactionBuilder, List<PublicKey>> {
return generateSpend(services, tx, listOf(PartyAndAmount(to, amount)), ourIdentity, onlyFromParties, anonymous)
}
/**
@ -115,10 +119,13 @@ object CashUtils {
* @param tx A builder, which may contain inputs, outputs and commands already. The relevant components needed
* to move the cash will be added on top.
* @param payments A list of amounts to pay, and the party to send the payment to.
* @param ourIdentity well known identity to create a new confidential identity from, for sending change to.
* @param ourIdentity ourIdentity is used to determine the where the change will be sent.
* If anonymous is true then an anonymous identity will be generated from this and the change
* will be spent to that, otherwise ourIdentity will be used as is.
* @param onlyFromParties if non-null, the asset states will be filtered to only include those issued by the set
* of given parties. This can be useful if the party you're trying to pay has expectations
* about which type of asset claims they are willing to accept.
* @param anonymous whether or not to use CI to send the change to
* @return A [Pair] of the same transaction builder passed in as [tx], and the list of keys that need to sign
* the resulting transaction for it to be valid.
* @throws InsufficientBalanceException when a cash spending transaction fails because
@ -131,7 +138,8 @@ object CashUtils {
tx: TransactionBuilder,
payments: List<PartyAndAmount<Currency>>,
ourIdentity: PartyAndCertificate,
onlyFromParties: Set<AbstractParty> = emptySet()): Pair<TransactionBuilder, List<PublicKey>> {
onlyFromParties: Set<AbstractParty> = emptySet(),
anonymous: Boolean = true): Pair<TransactionBuilder, List<PublicKey>> {
fun deriveState(txState: TransactionState<Cash.State>, amt: Amount<Issued<Currency>>, owner: AbstractParty): TransactionState<Cash.State> {
return txState.copy(data = txState.data.copy(amount = amt, owner = owner))
}
@ -141,17 +149,18 @@ object CashUtils {
val cashSelection = AbstractCashSelection.getInstance { services.jdbcSession().metaData }
val acceptableCoins = cashSelection.unconsumedCashStatesForSpending(services, totalAmount, onlyFromParties, tx.notary, tx.lockId)
val revocationEnabled = false // Revocation is currently unsupported
// Generate a new identity that change will be sent to for confidentiality purposes. This means that a
// If anonymous is true, generate a new identity that change will be sent to for confidentiality purposes. This means that a
// third party with a copy of the transaction (such as the notary) cannot identify who the change was
// sent to
val changeIdentity = services.keyManagementService.freshKeyAndCert(ourIdentity, revocationEnabled)
val changeIdentity = if (anonymous) services.keyManagementService.freshKeyAndCert(ourIdentity, revocationEnabled).party.anonymise() else ourIdentity.party
return OnLedgerAsset.generateSpend(
tx,
payments,
acceptableCoins,
changeIdentity.party.anonymise(),
changeIdentity,
::deriveState,
Cash()::generateMoveCommand
)
}
}