1 files changed, 27 insertions, 0 deletions
diff --git a/packages/taler-wallet-core/src/util/denominations.ts b/packages/taler-wallet-core/src/util/denominations.ts
index ef35fe198..fb766e96a 100644
--- a/packages/taler-wallet-core/src/util/denominations.ts
+++ b/packages/taler-wallet-core/src/util/denominations.ts
@@ -20,12 +20,16 @@ import {
   Amounts,
   AmountString,
   DenominationInfo,
+  Duration,
+  durationFromSpec,
   FeeDescription,
   FeeDescriptionPair,
   TalerProtocolTimestamp,
   TimePoint,
   WireFee,
 } from "@gnu-taler/taler-util";
+import { DenominationRecord } from "../db.js";
+import { walletCoreDebugFlags } from "./debugFlags.js";
 
 /**
  * Given a list of denominations with the same value and same period of time:
@@ -443,3 +447,26 @@ export function createTimeline<Type extends object>(
     return result;
   }, [] as FeeDescription[]);
 }
+
+/**
+ * Check if a denom is withdrawable based on the expiration time,
+ * revocation and offered state.
+ */
+export function isWithdrawableDenom(d: DenominationRecord): boolean {
+  const now = AbsoluteTime.now();
+  const start = AbsoluteTime.fromTimestamp(d.stampStart);
+  const withdrawExpire = AbsoluteTime.fromTimestamp(d.stampExpireWithdraw);
+  const started = AbsoluteTime.cmp(now, start) >= 0;
+  let lastPossibleWithdraw: AbsoluteTime;
+  if (walletCoreDebugFlags.denomselAllowLate) {
+    lastPossibleWithdraw = start;
+  } else {
+    lastPossibleWithdraw = AbsoluteTime.subtractDuraction(
+      withdrawExpire,
+      durationFromSpec({ minutes: 5 }),
+    );
+  }
+  const remaining = Duration.getRemaining(lastPossibleWithdraw, now);
+  const stillOkay = remaining.d_ms !== 0;
+  return started && stillOkay && !d.isRevoked && d.isOffered;
+}