[taler-wallet-core] branch master updated: set gzip timestamp to 0 in backup blob

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dold pushed a commit to branch master
in repository wallet-core.

The following commit(s) were added to refs/heads/master by this push:
     new eaced5ca set gzip timestamp to 0 in backup blob
eaced5ca is described below

commit eaced5ca63f209ee3cab6bbf2339642e6f434ce6
Author: Florian Dold <florian@dold.me>
AuthorDate: Wed Jun 23 11:46:10 2021 +0200

    set gzip timestamp to 0 in backup blob
---
 .../src/operations/backup/export.ts                | 72 +++++++++++------
 .../src/operations/backup/index.ts                 | 89 +++++++++++-----------
 2 files changed, 94 insertions(+), 67 deletions(-)

diff --git a/packages/taler-wallet-core/src/operations/backup/export.ts 
b/packages/taler-wallet-core/src/operations/backup/export.ts
index ab226265..eae7995c 100644
--- a/packages/taler-wallet-core/src/operations/backup/export.ts
+++ b/packages/taler-wallet-core/src/operations/backup/export.ts
@@ -24,44 +24,54 @@
 /**
  * Imports.
  */
-import { hash } from "../../crypto/primitives/nacl-fast.js";
 import {
-  WalletBackupContentV1,
-  BackupExchange,
-  BackupCoin,
-  BackupDenomination,
-  BackupReserve,
-  BackupPurchase,
-  BackupProposal,
-  BackupRefreshGroup,
+  Amounts,
   BackupBackupProvider,
-  BackupTip,
-  BackupRecoupGroup,
-  BackupWithdrawalGroup,
   BackupBackupProviderTerms,
+  BackupCoin,
   BackupCoinSource,
   BackupCoinSourceType,
+  BackupDenomination,
+  BackupExchange,
+  BackupExchangeDetails,
   BackupExchangeWireFee,
-  BackupRefundItem,
-  BackupRefundState,
+  BackupProposal,
   BackupProposalStatus,
+  BackupPurchase,
+  BackupRecoupGroup,
+  BackupRefreshGroup,
   BackupRefreshOldCoin,
   BackupRefreshSession,
-  BackupExchangeDetails,
+  BackupRefundItem,
+  BackupRefundState,
+  BackupReserve,
+  BackupTip,
+  BackupWithdrawalGroup,
+  canonicalizeBaseUrl,
+  canonicalJson,
+  getTimestampNow,
+  Logger,
+  timestampToIsoString,
+  WalletBackupContentV1,
 } from "@gnu-taler/taler-util";
 import { InternalWalletState } from "../../common.js";
-import { provideBackupState, getWalletBackupState } from "./state.js";
-import { Amounts, getTimestampNow } from "@gnu-taler/taler-util";
+import { hash } from "../../crypto/primitives/nacl-fast.js";
 import {
+  encodeCrock,
+  getRandomBytes,
+  stringToBytes,
+} from "../../crypto/talerCrypto.js";
+import {
+  AbortStatus,
   CoinSourceType,
   CoinStatus,
-  RefundState,
-  AbortStatus,
   ProposalStatus,
+  RefundState,
   WALLET_BACKUP_STATE_KEY,
 } from "../../db.js";
-import { encodeCrock, stringToBytes, getRandomBytes } from 
"../../crypto/talerCrypto.js";
-import { canonicalizeBaseUrl, canonicalJson } from "@gnu-taler/taler-util";
+import { getWalletBackupState, provideBackupState } from "./state.js";
+
+const logger = new Logger("backup/export.ts");
 
 export async function exportBackup(
   ws: InternalWalletState,
@@ -444,8 +454,10 @@ export async function exportBackup(
         });
       });
 
+      const ts = getTimestampNow();
+
       if (!bs.lastBackupTimestamp) {
-        bs.lastBackupTimestamp = getTimestampNow();
+        bs.lastBackupTimestamp = ts;
       }
 
       const backupBlob: WalletBackupContentV1 = {
@@ -469,18 +481,30 @@ export async function exportBackup(
         tombstones: [],
       };
 
-      // If the backup changed, we increment our clock.
+      // If the backup changed, we change our nonce and timestamp.
 
       let h = encodeCrock(hash(stringToBytes(canonicalJson(backupBlob))));
-      if (h != bs.lastBackupPlainHash) {
+      if (h !== bs.lastBackupPlainHash) {
+        logger.trace(
+          `plain backup hash changed (from ${bs.lastBackupPlainHash}to ${h})`,
+        );
+        bs.lastBackupTimestamp = ts;
+        backupBlob.timestamp = ts;
         bs.lastBackupPlainHash = encodeCrock(
           hash(stringToBytes(canonicalJson(backupBlob))),
         );
         bs.lastBackupNonce = encodeCrock(getRandomBytes(32));
+        logger.trace(
+          `setting timestamp to ${timestampToIsoString(ts)} and nonce to ${
+            bs.lastBackupNonce
+          }`,
+        );
         await tx.config.put({
           key: WALLET_BACKUP_STATE_KEY,
           value: bs,
         });
+      } else {
+        logger.trace("backup hash did not change");
       }
 
       return backupBlob;
diff --git a/packages/taler-wallet-core/src/operations/backup/index.ts 
b/packages/taler-wallet-core/src/operations/backup/index.ts
index 041c927a..0d3cf578 100644
--- a/packages/taler-wallet-core/src/operations/backup/index.ts
+++ b/packages/taler-wallet-core/src/operations/backup/index.ts
@@ -24,24 +24,39 @@
 /**
  * Imports.
  */
-import { InternalWalletState } from "../../common.js";
 import {
   AmountString,
   BackupRecovery,
+  buildCodecForObject,
+  canonicalizeBaseUrl,
+  canonicalJson,
+  Codec,
   codecForAmountString,
+  codecForBoolean,
+  codecForNumber,
+  codecForString,
+  codecOptional,
+  ConfirmPayResultType,
+  durationFromSpec,
+  getTimestampNow,
+  j2s,
+  Logger,
+  PreparePayResultType,
+  RecoveryLoadRequest,
+  RecoveryMergeStrategy,
+  TalerErrorDetails,
+  Timestamp,
+  timestampAddDuration,
+  URL,
   WalletBackupContentV1,
 } from "@gnu-taler/taler-util";
+import { gunzipSync, gzipSync } from "fflate";
+import { InternalWalletState } from "../../common.js";
+import { kdf } from "../../crypto/primitives/kdf.js";
 import {
-  BackupProviderRecord,
-  BackupProviderTerms,
-  ConfigRecord,
-  WalletBackupConfState,
-  WALLET_BACKUP_STATE_KEY,
-} from "../../db.js";
-import {
-  checkDbInvariant,
-  checkLogicInvariant,
-} from "../../util/invariants.js";
+  secretbox,
+  secretbox_open,
+} from "../../crypto/primitives/nacl-fast.js";
 import {
   bytesToString,
   decodeCrock,
@@ -53,43 +68,24 @@ import {
   rsaBlind,
   stringToBytes,
 } from "../../crypto/talerCrypto.js";
-import { canonicalizeBaseUrl, canonicalJson, j2s } from 
"@gnu-taler/taler-util";
-import {
-  durationFromSpec,
-  getTimestampNow,
-  Timestamp,
-  timestampAddDuration,
-  URL
-} from "@gnu-taler/taler-util";
+import { CryptoApi } from "../../crypto/workers/cryptoApi.js";
 import {
-  buildCodecForObject,
-  Codec,
-  codecForBoolean,
-  codecForNumber,
-  codecForString,
-  codecOptional,
-} from "@gnu-taler/taler-util";
+  BackupProviderRecord,
+  BackupProviderTerms,
+  ConfigRecord,
+  WalletBackupConfState,
+  WALLET_BACKUP_STATE_KEY,
+} from "../../db.js";
 import {
   HttpResponseStatus,
   readSuccessResponseJsonOrThrow,
   readTalerErrorResponse,
 } from "../../util/http.js";
-import { Logger } from "@gnu-taler/taler-util";
-import { gunzipSync, gzipSync } from "fflate";
-import { kdf } from "../../crypto/primitives/kdf.js";
-import { initRetryInfo } from "../../util/retries.js";
 import {
-  ConfirmPayResultType,
-  PreparePayResultType,
-  RecoveryLoadRequest,
-  RecoveryMergeStrategy,
-  TalerErrorDetails,
-} from "@gnu-taler/taler-util";
-import { CryptoApi } from "../../crypto/workers/cryptoApi.js";
-import {
-  secretbox,
-  secretbox_open,
-} from "../../crypto/primitives/nacl-fast.js";
+  checkDbInvariant,
+  checkLogicInvariant,
+} from "../../util/invariants.js";
+import { initRetryInfo } from "../../util/retries.js";
 import {
   checkPaymentByProposalId,
   confirmPay,
@@ -97,7 +93,7 @@ import {
 } from "../pay.js";
 import { exportBackup } from "./export.js";
 import { BackupCryptoPrecomputedData, importBackup } from "./import.js";
-import { provideBackupState, getWalletBackupState } from "./state.js";
+import { getWalletBackupState, provideBackupState } from "./state.js";
 
 const logger = new Logger("operations/backup.ts");
 
@@ -137,7 +133,9 @@ export async function encryptBackup(
   chunks.push(nonce);
   const backupJsonContent = canonicalJson(blob);
   logger.trace("backup JSON size", backupJsonContent.length);
-  const compressedContent = gzipSync(stringToBytes(backupJsonContent));
+  const compressedContent = gzipSync(stringToBytes(backupJsonContent), {
+    mtime: 0,
+  });
   const secret = deriveBlobSecret(config);
   const encrypted = secretbox(compressedContent, nonce.slice(0, 24), secret);
   chunks.push(encrypted);
@@ -261,7 +259,12 @@ async function runBackupCycleForProvider(
     backupJson,
   } = args;
   const accountKeyPair = deriveAccountKeyPair(backupConfig, provider.baseUrl);
+
+  const newHash = encodeCrock(currentBackupHash);
+  const oldHash = provider.lastBackupHash;
+
   logger.trace(`trying to upload backup to ${provider.baseUrl}`);
+  logger.trace(`old hash ${oldHash}, new hash ${newHash}`);
 
   const syncSig = await ws.cryptoApi.makeSyncSignature({
     newHash: encodeCrock(currentBackupHash),

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