feat(1717): mirror node getexchangerate response validation

src/core/services/mirrornode/__tests__/unit/mocks.ts

@@ -205,15 +205,15 @@ export const createMockExchangeRateResponse = (
 ): ExchangeRateResponse => ({
   current_rate: {
     cent_equivalent: 12,
-    expiration_time: '2024-01-01T12:00:00.000Z',
+    expiration_time: 1774962000,
     hbar_equivalent: 1,
   },
   next_rate: {
     cent_equivalent: 12,
-    expiration_time: '2024-01-01T12:00:00.000Z',
+    expiration_time: 1774965600,
     hbar_equivalent: 1,
   },
-  timestamp: '2024-01-01T12:00:00.000Z',
+  timestamp: '1774958462.794936000',
   ...overrides,
 });
 

src/core/services/mirrornode/hedera-mirrornode-service.ts

@@ -37,6 +37,7 @@ import { handleMirrorNodeErrorResponse } from '@/core/utils/handle-mirror-node-e
 import {
   AccountAPIResponseSchema,
   ContractInfoSchema,
+  ExchangeRateResponseSchema,
   GetAccountsAPIResponseSchema,
   NftInfoSchema,
   TokenAirdropsResponseSchema,
@@ -567,7 +568,11 @@ export class HederaMirrornodeServiceDefaultImpl implements HederaMirrornodeServi
         );
       }
 
-      return (await response.json()) as ExchangeRateResponse;
+      return parseWithSchema(
+        ExchangeRateResponseSchema,
+        await response.json(),
+        'Mirror Node GET /network/exchangerate',
+      );
     } catch (error) {
       if (error instanceof CliError) throw error;
       throw new NetworkError('Failed to fetch exchange rate', {

src/core/services/mirrornode/schemas.ts

@@ -8,6 +8,7 @@ import {
   type AccountListItemBalance,
   type AccountListItemTokenBalance,
   type ContractInfo,
+  type ExchangeRateResponse,
   type GetAccountsAPIResponse,
   MirrorNodeKeyType,
   type NftInfo,
@@ -231,6 +232,19 @@ export const ContractInfoSchema: z.ZodType<ContractInfo> = z.object({
   stake_period_start: nullableStringKey,
 });
 
+const exchangeRateBandSchema = z.object({
+  cent_equivalent: z.number(),
+  expiration_time: z.number(),
+  hbar_equivalent: z.number(),
+});
+
+export const ExchangeRateResponseSchema: z.ZodType<ExchangeRateResponse> =
+  z.object({
+    current_rate: exchangeRateBandSchema,
+    next_rate: exchangeRateBandSchema,
+    timestamp: z.string(),
+  });
+
 const transactionTransferItemSchema: z.ZodType<TransactionTransferItem> =
   z.object({
     account: z.string(),

src/core/services/mirrornode/types.ts

@@ -244,12 +244,12 @@ export interface TokenAirdropsResponse {
 export interface ExchangeRateResponse {
   current_rate: {
     cent_equivalent: number;
-    expiration_time: string;
+    expiration_time: number;
     hbar_equivalent: number;
   };
   next_rate: {
     cent_equivalent: number;
-    expiration_time: string;
+    expiration_time: number;
     hbar_equivalent: number;
   };
   timestamp: string;