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don't rip off the merchant via our coin selection

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This commit is contained in:
Florian Dold 2020-03-27 15:20:02 +05:30
parent 5d1b0df8a4
commit 1c747ae004
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1 changed files with 8 additions and 2 deletions
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10
src/operations/pay.ts
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@ -234,11 +234,17 @@ export function selectPayCoins(
).amount;
if (Amounts.cmp(amountActualAvailable, amountPayRemaining) > 0) {
// Partial spending
// Partial spending, as the coin is worth more than the remaining
// amount to pay.
coinSpend = Amounts.add(amountPayRemaining, depositFeeSpend).amount;
// Make sure we contribute at least the deposit fee, otherwise
// contributing this coin would cause a loss for the merchant.
if (Amounts.cmp(coinSpend, aci.feeDeposit) < 0) {
coinSpend = aci.feeDeposit;
}
amountPayRemaining = Amounts.getZero(currency);
} else {
// Spend the full remaining amount
// Spend the full remaining amount on the coin
coinSpend = aci.availableAmount;
amountPayRemaining = Amounts.add(amountPayRemaining, depositFeeSpend)
.amount;