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/*
This file is part of GNU Taler
(C) 2021-2024 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Selection of denominations for withdrawals.
*
* @author Florian Dold
*/
/**
* Imports.
*/
import {
AbsoluteTime,
AmountJson,
Amounts,
DenomSelectionState,
ForcedDenomSel,
Logger,
} from "@gnu-taler/taler-util";
import { DenominationRecord, timestampAbsoluteFromDb } from "./db.js";
import { isWithdrawableDenom } from "./denominations.js";
const logger = new Logger("denomSelection.ts");
/**
* Get a list of denominations (with repetitions possible)
* whose total value is as close as possible to the available
* amount, but never larger.
*/
export function selectWithdrawalDenominations(
amountAvailable: AmountJson,
denoms: DenominationRecord[],
denomselAllowLate: boolean = false,
): DenomSelectionState {
let remaining = Amounts.copy(amountAvailable);
const selectedDenoms: {
count: number;
denomPubHash: string;
}[] = [];
let totalCoinValue = Amounts.zeroOfCurrency(amountAvailable.currency);
let totalWithdrawCost = Amounts.zeroOfCurrency(amountAvailable.currency);
let earliestDepositExpiration: AbsoluteTime | undefined;
let hasDenomWithAgeRestriction = false;
denoms = denoms.filter((d) => isWithdrawableDenom(d, denomselAllowLate));
denoms.sort((d1, d2) => Amounts.cmp(d2.value, d1.value));
if (logger.shouldLogTrace()) {
logger.trace(
`selecting withdrawal denoms for ${Amounts.stringify(amountAvailable)}`,
);
}
for (const d of denoms) {
const cost = Amounts.add(d.value, d.fees.feeWithdraw).amount;
const res = Amounts.divmod(remaining, cost);
const count = res.quotient;
remaining = Amounts.sub(remaining, Amounts.mult(cost, count).amount).amount;
if (count > 0) {
totalCoinValue = Amounts.add(
totalCoinValue,
Amounts.mult(d.value, count).amount,
).amount;
totalWithdrawCost = Amounts.add(
totalWithdrawCost,
Amounts.mult(cost, count).amount,
).amount;
selectedDenoms.push({
count,
denomPubHash: d.denomPubHash,
});
hasDenomWithAgeRestriction =
hasDenomWithAgeRestriction || d.denomPub.age_mask > 0;
const expireDeposit = timestampAbsoluteFromDb(d.stampExpireDeposit);
if (!earliestDepositExpiration) {
earliestDepositExpiration = expireDeposit;
} else {
earliestDepositExpiration = AbsoluteTime.min(
expireDeposit,
earliestDepositExpiration,
);
}
}
if (logger.shouldLogTrace()) {
logger.trace(
`denom_pub_hash=${
d.denomPubHash
}, count=${count}, val=${Amounts.stringify(
d.value,
)}, wdfee=${Amounts.stringify(d.fees.feeWithdraw)}`,
);
}
if (Amounts.isZero(remaining)) {
break;
}
}
if (logger.shouldLogTrace()) {
logger.trace("(end of denom selection)");
}
earliestDepositExpiration ??= AbsoluteTime.never();
return {
selectedDenoms,
totalCoinValue: Amounts.stringify(totalCoinValue),
totalWithdrawCost: Amounts.stringify(totalWithdrawCost),
hasDenomWithAgeRestriction,
};
}
export function selectForcedWithdrawalDenominations(
amountAvailable: AmountJson,
denoms: DenominationRecord[],
forcedDenomSel: ForcedDenomSel,
denomselAllowLate: boolean,
): DenomSelectionState {
const selectedDenoms: {
count: number;
denomPubHash: string;
}[] = [];
let totalCoinValue = Amounts.zeroOfCurrency(amountAvailable.currency);
let totalWithdrawCost = Amounts.zeroOfCurrency(amountAvailable.currency);
let earliestDepositExpiration: AbsoluteTime | undefined;
let hasDenomWithAgeRestriction = false;
denoms = denoms.filter((d) => isWithdrawableDenom(d, denomselAllowLate));
denoms.sort((d1, d2) => Amounts.cmp(d2.value, d1.value));
for (const fds of forcedDenomSel.denoms) {
const count = fds.count;
const denom = denoms.find((x) => {
return Amounts.cmp(x.value, fds.value) == 0;
});
if (!denom) {
throw Error(
`unable to find denom for forced selection (value ${fds.value})`,
);
}
const cost = Amounts.add(denom.value, denom.fees.feeWithdraw).amount;
totalCoinValue = Amounts.add(
totalCoinValue,
Amounts.mult(denom.value, count).amount,
).amount;
totalWithdrawCost = Amounts.add(
totalWithdrawCost,
Amounts.mult(cost, count).amount,
).amount;
selectedDenoms.push({
count,
denomPubHash: denom.denomPubHash,
});
hasDenomWithAgeRestriction =
hasDenomWithAgeRestriction || denom.denomPub.age_mask > 0;
const expireDeposit = timestampAbsoluteFromDb(denom.stampExpireDeposit);
if (!earliestDepositExpiration) {
earliestDepositExpiration = expireDeposit;
} else {
earliestDepositExpiration = AbsoluteTime.min(
expireDeposit,
earliestDepositExpiration,
);
}
}
earliestDepositExpiration ??= AbsoluteTime.never();
return {
selectedDenoms,
totalCoinValue: Amounts.stringify(totalCoinValue),
totalWithdrawCost: Amounts.stringify(totalWithdrawCost),
hasDenomWithAgeRestriction,
};
}
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