From 0290c5fd379a4b4262d8835d4131b7c4e8a2f2f2 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Mon, 7 Mar 2022 12:09:38 +0100
Subject: address protocol changes in the exchange

The exchange now has a wad fee and truncates the payto hash in signatures
---
 .../src/crypto/workers/cryptoImplementation.ts             |  4 +++-
 packages/taler-wallet-core/src/db.ts                       |  5 +++++
 packages/taler-wallet-core/src/operations/backup/export.ts |  6 +++---
 packages/taler-wallet-core/src/operations/backup/import.ts |  1 +
 packages/taler-wallet-core/src/operations/exchanges.ts     | 14 ++++++++++----
 5 files changed, 22 insertions(+), 8 deletions(-)

(limited to 'packages/taler-wallet-core/src')

diff --git a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
index bd18e8d2e..f9cc63ecc 100644
--- a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
@@ -48,6 +48,7 @@ import {
   hashCoinEv,
   hashCoinEvInner,
   hashDenomPub,
+  hashTruncate32,
   keyExchangeEcdheEddsa,
   Logger,
   MakeSyncSignatureRequest,
@@ -329,6 +330,7 @@ export class CryptoImplementation {
       .put(timestampRoundedToBuffer(wf.endStamp))
       .put(amountToBuffer(wf.wireFee))
       .put(amountToBuffer(wf.closingFee))
+      .put(amountToBuffer(wf.wadFee))
       .build();
     const sig = decodeCrock(wf.sig);
     const pub = decodeCrock(masterPub);
@@ -376,7 +378,7 @@ export class CryptoImplementation {
     sig: string,
     masterPub: string,
   ): boolean {
-    const paytoHash = hash(stringToBytes(paytoUri + "\0"));
+    const paytoHash = hashTruncate32(stringToBytes(paytoUri + "\0"));
     const p = buildSigPS(TalerSignaturePurpose.MASTER_WIRE_DETAILS)
       .put(paytoHash)
       .build();
diff --git a/packages/taler-wallet-core/src/db.ts b/packages/taler-wallet-core/src/db.ts
index 410311530..23239069e 100644
--- a/packages/taler-wallet-core/src/db.ts
+++ b/packages/taler-wallet-core/src/db.ts
@@ -1026,6 +1026,11 @@ export interface WireFee {
    */
   closingFee: AmountJson;
 
+  /**
+   * Fees for inter-exchange transfers from P2P payments.
+   */
+  wadFee: AmountJson;
+
   /**
    * Start date of the fee.
    */
diff --git a/packages/taler-wallet-core/src/operations/backup/export.ts b/packages/taler-wallet-core/src/operations/backup/export.ts
index 75724dca7..05ef66883 100644
--- a/packages/taler-wallet-core/src/operations/backup/export.ts
+++ b/packages/taler-wallet-core/src/operations/backup/export.ts
@@ -113,9 +113,8 @@ export async function exportBackup(
       } = {};
 
       await tx.withdrawalGroups.iter().forEachAsync(async (wg) => {
-        const withdrawalGroups = (withdrawalGroupsByReserve[
-          wg.reservePub
-        ] ??= []);
+        const withdrawalGroups = (withdrawalGroupsByReserve[wg.reservePub] ??=
+          []);
         withdrawalGroups.push({
           raw_withdrawal_amount: Amounts.stringify(wg.rawWithdrawalAmount),
           selected_denoms: wg.denomsSel.selectedDenoms.map((x) => ({
@@ -288,6 +287,7 @@ export async function exportBackup(
             wireFees.push({
               wire_type: x,
               closing_fee: Amounts.stringify(f.closingFee),
+              wad_fee: Amounts.stringify(f.wadFee),
               end_stamp: f.endStamp,
               sig: f.sig,
               start_stamp: f.startStamp,
diff --git a/packages/taler-wallet-core/src/operations/backup/import.ts b/packages/taler-wallet-core/src/operations/backup/import.ts
index 21b10a945..6dafa8c89 100644
--- a/packages/taler-wallet-core/src/operations/backup/import.ts
+++ b/packages/taler-wallet-core/src/operations/backup/import.ts
@@ -305,6 +305,7 @@ export async function importBackup(
               sig: fee.sig,
               startStamp: fee.start_stamp,
               wireFee: Amounts.parseOrThrow(fee.wire_fee),
+              wadFee: Amounts.parseOrThrow(fee.wad_fee),
             });
           }
           await tx.exchangeDetails.put({
diff --git a/packages/taler-wallet-core/src/operations/exchanges.ts b/packages/taler-wallet-core/src/operations/exchanges.ts
index c50afc215..9d4a56fff 100644
--- a/packages/taler-wallet-core/src/operations/exchanges.ts
+++ b/packages/taler-wallet-core/src/operations/exchanges.ts
@@ -266,6 +266,7 @@ async function validateWireInfo(
         sig: x.sig,
         startStamp,
         wireFee: Amounts.parseOrThrow(x.wire_fee),
+        wadFee: Amounts.parseOrThrow(x.wad_fee),
       };
       let isValid = false;
       if (ws.insecureTrustExchange) {
@@ -451,7 +452,8 @@ export async function downloadTosFromAcceptedFormat(
   ws: InternalWalletState,
   baseUrl: string,
   timeout: Duration,
-  acceptedFormat?: string[]): Promise<ExchangeTosDownloadResult> {
+  acceptedFormat?: string[],
+): Promise<ExchangeTosDownloadResult> {
   let tosFound: ExchangeTosDownloadResult | undefined;
   //Remove this when exchange supports multiple content-type in accept header
   if (acceptedFormat)
@@ -467,7 +469,7 @@ export async function downloadTosFromAcceptedFormat(
         break;
       }
     }
-  if (tosFound !== undefined) return tosFound
+  if (tosFound !== undefined) return tosFound;
   // If none of the specified format was found try text/plain
   return await downloadExchangeWithTermsOfService(
     baseUrl,
@@ -550,8 +552,12 @@ async function updateExchangeFromUrlImpl(
 
   logger.info("finished validating exchange /wire info");
 
-
-  const tosDownload = await downloadTosFromAcceptedFormat(ws, baseUrl, timeout, acceptedFormat)
+  const tosDownload = await downloadTosFromAcceptedFormat(
+    ws,
+    baseUrl,
+    timeout,
+    acceptedFormat,
+  );
 
   let recoupGroupId: string | undefined;
 
-- 
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