wallet-core: report supportedAgeGroups

packages/taler-util/src/taler-crypto.ts

@@ -1025,6 +1025,23 @@ export namespace AgeRestriction {
     return count;
   }
 
+  /**
+   * Get the starting points for age groups in the mask.
+   */
+  export function getAgeGroupsFromMask(mask: number): number[] {
+    const groups: number[] = [];
+    let age = 1;
+    let m = mask >> 1;
+    while (m > 0) {
+      if (m & 1) {
+        groups.push(age);
+      }
+      m = m >> 1;
+      age++;
+    }
+    return groups;
+  }
+
   export function getAgeGroupIndex(mask: number, age: number): number {
     invariant((mask & 1) === 1);
     let i = 0;

packages/taler-util/src/wallet-types.ts

@@ -919,6 +919,7 @@ export interface ExchangeListItem {
   paytoUris: string[];
   tosStatus: ExchangeTosStatus;
   exchangeStatus: ExchangeEntryStatus;
+  supportedAgeGroups: number[];
   /**
    * Permanently added to the wallet, as opposed to just
    * temporarily queried.
@@ -998,6 +999,7 @@ export const codecForExchangeListItem = (): Codec<ExchangeListItem> =>
     .property("tosStatus", codecForAny())
     .property("exchangeStatus", codecForAny())
     .property("permanent", codecForBoolean())
+    .property("supportedAgeGroups", codecForList(codecForNumber()))
     .build("ExchangeListItem");
 
 export const codecForExchangesListResponse = (): Codec<ExchangesListResponse> =>

packages/taler-wallet-core/src/db.ts

@@ -473,6 +473,11 @@ export interface ExchangeDetailsRecord {
     | undefined;
 
   wireInfo: WireInfo;
+
+  /**
+   * Age restrictions supported by the exchange (bitmask).
+   */
+  ageMask?: number;
 }
 
 export interface ExchangeTosRecord {

packages/taler-wallet-core/src/operations/common.ts

@@ -18,6 +18,7 @@
  * Imports.
  */
 import {
+  AgeRestriction,
   AmountJson,
   Amounts,
   CoinRefreshRequest,
@@ -365,6 +366,7 @@ export function makeExchangeListItem(
       paytoUris: [],
       exchangeStatus: ExchangeEntryStatus.Unknown,
       permanent: r.permanent,
+      supportedAgeGroups: [],
     };
   }
   let exchangeStatus;
@@ -376,5 +378,8 @@ export function makeExchangeListItem(
     paytoUris: exchangeDetails.wireInfo.accounts.map((x) => x.payto_uri),
     exchangeStatus,
     permanent: r.permanent,
+    supportedAgeGroups: exchangeDetails.ageMask
+      ? AgeRestriction.getAgeGroupsFromMask(exchangeDetails.ageMask)
+      : [],
   };
 }

packages/taler-wallet-core/src/operations/exchanges.ts

@@ -76,6 +76,7 @@ import {
   runOperationHandlerForResult,
 } from "../util/retries.js";
 import { WALLET_EXCHANGE_PROTOCOL_VERSION } from "../versions.js";
+import { isWithdrawableDenom } from "./withdraw.js";
 
 const logger = new Logger("exchanges.ts");
 
@@ -657,6 +658,14 @@ export async function updateExchangeFromUrlHandler(
 
   let detailsPointerChanged = false;
 
+  let ageMask = 0;
+  for (const x of keysInfo.currentDenominations) {
+    if (isWithdrawableDenom(x) && x.denomPub.age_mask != 0) {
+      ageMask = x.denomPub.age_mask;
+      break;
+    }
+  }
+
   const updated = await ws.db
     .mktx((x) => [
       x.exchanges,
@@ -699,6 +708,7 @@ export async function updateExchangeFromUrlHandler(
         wireInfo,
         tosCurrentEtag: tosDownload.tosEtag,
         tosAccepted: existingTosAccepted,
+        ageMask,
       };
       if (existingDetails?.rowId) {
         newDetails.rowId = existingDetails.rowId;