taler-typescript-core

commit ca821acf48f8e08284be17e6e200fb53ccbd4323
parent 487357341ff4b4c6ba9587dcf40d766ef43c7766
Author: Florian Dold <florian@dold.me>
Date:   Thu,  9 Oct 2025 15:28:30 +0200

donau: make setDonau idempotent

Diffstat:
M
packages/taler-wallet-core/src/donau.ts
 | 
14
+++++++++++++-

1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/packages/taler-wallet-core/src/donau.ts b/packages/taler-wallet-core/src/donau.ts
@@ -165,12 +165,24 @@ export async function handleSetDonau(
   // FIXME: This should be idempotent, do not re-salt
   // for same taxpayer ID.
   const salt = getRandomBytes(32);
-  // FIXME: Where is the salted hashing for this specified?
+  // Hashing as defined in lsd0013.
   const idHasher = createHashContext();
   idHasher.update(stringToBytes(req.taxPayerId + "\0"));
   idHasher.update(stringToBytes(encodeCrock(salt) + "\0"));
   const saltedId = idHasher.finish();
   await wex.db.runAllStoresReadWriteTx({}, async (tx) => {
+    const oldRec = await WalletDbHelpers.getConfig(
+      tx,
+      ConfigRecordKey.DonauConfig,
+    );
+    if (
+      oldRec &&
+      oldRec.value.donauBaseUrl === req.donauBaseUrl &&
+      oldRec.value.donauTaxId === req.taxPayerId
+    ) {
+      // Be idempotent, re-use old salt.
+      return;
+    }
     await tx.config.put({
       key: ConfigRecordKey.DonauConfig,
       value: {