fix: Implement short living ens resolver for Name component after send flow (#21515)

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## **Description**

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Write a short description of the changes included in this pull request,
also include relevant motivation and context. Have in mind the following
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1. What is the reason for the change?
2. What is the improvement/solution?
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Similarly what's being done in
MetaMask/metamask-extension#37047 this PR
implements a short living cache for `Name` component to use after send
flow.

## **Changelog**

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`CHANGELOG entry: Added a new tab for users to see their NFTs`
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CHANGELOG entry: Show ENS name in the confirmation after picking ENS
recipient in send flow

## **Related issues**

Fixes: #19072

## **Manual testing steps**

1. Go to send flow
2. Pick ENS recipient
3. Proceed into confirmation - you should be able to see ENS in the
confirmation now

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**



https://github.com/user-attachments/assets/d74ee373-8df0-43d4-924a-5520eb203240



## **Pre-merge author checklist**

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Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [X] I've completed the PR template to the best of my ability
- [X] I’ve included tests if applicable
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Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds a 5‑minute ENS resolution cache used post-send and surfaces
cached ENS in Name display; integrates with validation and updates
tests.
> 
> - **ENS caching (5 min TTL)**:
> - Add `useSendFlowEnsResolutions` with `setResolvedAddress` and
`getResolvedENSName` to cache ENS per `chainId:address`.
> - **Send flow integration**:
> - Update `useNameValidation` to call `setResolvedAddress(chainId,
ensName, resolvedAddress)` when `isEvmSendType` and ENS resolves.
> - **Display name integration**:
> - Update `useDisplayName` to read `ensName` via
`getResolvedENSName(variation, value)` and prioritize it in `name`
selection.
> - **Tests**:
> - New tests for cache storage, expiration, chain separation, overwrite
behavior.
> - Extend `useNameValidation` tests to assert cache writes only for
EVM/ENS.
>   - Add `useDisplayName` test to verify ENS name is returned.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
c5a24a9. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: OGPoyraz

app/components/Views/confirmations/hooks/send/useNameValidation.test.ts

@@ -7,16 +7,41 @@ import * as SnapNameResolution from '../../../../Snaps/hooks/useSnapNameResoluti
 import * as SendValidationUtils from '../../utils/send-address-validations';
 import { evmSendStateMock } from '../../__mocks__/send.mock';
 import { useNameValidation } from './useNameValidation';
+import { useSendType } from './useSendType';
+import { useSendFlowEnsResolutions } from './useSendFlowEnsResolutions';
 
 jest.mock('@metamask/bridge-controller', () => ({
   formatChainIdToCaip: jest.fn(),
 }));
 
+jest.mock('./useSendType', () => ({
+  useSendType: jest.fn(),
+}));
+
+jest.mock('./useSendFlowEnsResolutions', () => ({
+  useSendFlowEnsResolutions: jest.fn(() => ({
+    setResolvedAddress: jest.fn(),
+  })),
+}));
+
 const mockState = {
   state: evmSendStateMock,
 };
 
 describe('useNameValidation', () => {
+  const mockUseSendType = jest.mocked(useSendType);
+  const mockUseSendFlowEnsResolutions = jest.mocked(useSendFlowEnsResolutions);
+  const mockSetResolvedAddress = jest.fn();
+
+  beforeEach(() => {
+    mockUseSendType.mockReturnValue({
+      isEvmSendType: false,
+    } as ReturnType<typeof useSendType>);
+    mockUseSendFlowEnsResolutions.mockReturnValue({
+      setResolvedAddress: mockSetResolvedAddress,
+    } as unknown as ReturnType<typeof useSendFlowEnsResolutions>);
+  });
+
   it('return function to validate name', () => {
     const { result } = renderHookWithProvider(
       () => useNameValidation(),
@@ -44,6 +69,36 @@ describe('useNameValidation', () => {
     ).toStrictEqual({
       resolvedAddress: 'dummy_address',
     });
+    expect(mockSetResolvedAddress).not.toHaveBeenCalled();
+  });
+
+  it('calls setResolvedAddress when name is resolved and isEvmSendType is true', async () => {
+    mockUseSendType.mockReturnValue({
+      isEvmSendType: true,
+    } as ReturnType<typeof useSendType>);
+    jest.spyOn(SnapNameResolution, 'useSnapNameResolution').mockReturnValue({
+      fetchResolutions: () =>
+        Promise.resolve([
+          { resolvedAddress: 'dummy_address' } as unknown as AddressResolution,
+        ]),
+    });
+    const { result } = renderHookWithProvider(
+      () => useNameValidation(),
+      mockState,
+    );
+    expect(
+      await result.current.validateName(
+        '5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
+        'test.eth',
+      ),
+    ).toStrictEqual({
+      resolvedAddress: 'dummy_address',
+    });
+    expect(mockSetResolvedAddress).toHaveBeenCalledWith(
+      '5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
+      'test.eth',
+      'dummy_address',
+    );
   });
 
   it('return confusable error and warning as name is resolved', async () => {

app/components/Views/confirmations/hooks/send/useNameValidation.ts

@@ -5,9 +5,13 @@ import { strings } from '../../../../../../locales/i18n';
 import { isENS } from '../../../../../util/address';
 import { useSnapNameResolution } from '../../../../Snaps/hooks/useSnapNameResolution';
 import { getConfusableCharacterInfo } from '../../utils/send-address-validations';
+import { useSendFlowEnsResolutions } from './useSendFlowEnsResolutions';
+import { useSendType } from './useSendType';
 
 export const useNameValidation = () => {
   const { fetchResolutions } = useSnapNameResolution();
+  const { setResolvedAddress } = useSendFlowEnsResolutions();
+  const { isEvmSendType } = useSendType();
 
   const validateName = useCallback(
     async (chainId: string, to: string) => {
@@ -24,6 +28,11 @@ export const useNameValidation = () => {
         }
         const resolvedAddress = resolutions[0]?.resolvedAddress;
 
+        if (resolvedAddress && isEvmSendType) {
+          // Set short living cache of ENS resolution for the given chain and address for confirmation screen
+          setResolvedAddress(chainId, to, resolvedAddress);
+        }
+
         return {
           resolvedAddress,
           ...getConfusableCharacterInfo(to),
@@ -34,7 +43,7 @@ export const useNameValidation = () => {
         error: strings('send.could_not_resolve_name'),
       };
     },
-    [fetchResolutions],
+    [fetchResolutions, isEvmSendType, setResolvedAddress],
   );
 
   return {

app/components/Views/confirmations/hooks/send/useSendFlowEnsResolutions.test.ts

@@ -0,0 +1,93 @@
+import { renderHook } from '@testing-library/react-hooks';
+import { useSendFlowEnsResolutions } from './useSendFlowEnsResolutions';
+
+describe('useSendFlowEnsResolutions', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('stores and retrieves ENS name for an address', () => {
+    const { result } = renderHook(() => useSendFlowEnsResolutions());
+    const chainId = '0x1';
+    const ensName = 'vitalik.eth';
+    const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045';
+
+    result.current.setResolvedAddress(chainId, ensName, address);
+    const retrieved = result.current.getResolvedENSName(chainId, address);
+
+    expect(retrieved).toBe(ensName);
+  });
+
+  it('returns undefined for non-existent address', () => {
+    const { result } = renderHook(() => useSendFlowEnsResolutions());
+    const chainId = '0x1';
+    const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96046';
+
+    const retrieved = result.current.getResolvedENSName(chainId, address);
+
+    expect(retrieved).toBeUndefined();
+  });
+
+  it('differentiates between different chain IDs', () => {
+    const { result } = renderHook(() => useSendFlowEnsResolutions());
+    const chainId1 = '0x1';
+    const chainId2 = '0x89';
+    const ensName = 'vitalik.eth';
+    const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045';
+
+    result.current.setResolvedAddress(chainId1, ensName, address);
+    const retrieved1 = result.current.getResolvedENSName(chainId1, address);
+    const retrieved2 = result.current.getResolvedENSName(chainId2, address);
+
+    expect(retrieved1).toBe(ensName);
+    expect(retrieved2).toBeUndefined();
+  });
+
+  it('returns undefined for expired cache entries', () => {
+    jest.useFakeTimers();
+    const { result } = renderHook(() => useSendFlowEnsResolutions());
+    const chainId = '0x1';
+    const ensName = 'vitalik.eth';
+    const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045';
+
+    result.current.setResolvedAddress(chainId, ensName, address);
+
+    jest.advanceTimersByTime(5 * 60 * 1000 + 1);
+
+    const retrieved = result.current.getResolvedENSName(chainId, address);
+
+    expect(retrieved).toBeUndefined();
+    jest.useRealTimers();
+  });
+
+  it('returns cached entry before expiration', () => {
+    jest.useFakeTimers();
+    const { result } = renderHook(() => useSendFlowEnsResolutions());
+    const chainId = '0x1';
+    const ensName = 'vitalik.eth';
+    const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045';
+
+    result.current.setResolvedAddress(chainId, ensName, address);
+
+    jest.advanceTimersByTime(5 * 60 * 1000 - 1000);
+
+    const retrieved = result.current.getResolvedENSName(chainId, address);
+
+    expect(retrieved).toBe(ensName);
+    jest.useRealTimers();
+  });
+
+  it('overwrites existing cache entry for same chain and address', () => {
+    const { result } = renderHook(() => useSendFlowEnsResolutions());
+    const chainId = '0x1';
+    const ensName1 = 'vitalik.eth';
+    const ensName2 = 'newname.eth';
+    const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045';
+
+    result.current.setResolvedAddress(chainId, ensName1, address);
+    result.current.setResolvedAddress(chainId, ensName2, address);
+    const retrieved = result.current.getResolvedENSName(chainId, address);
+
+    expect(retrieved).toBe(ensName2);
+  });
+});

app/components/Views/confirmations/hooks/send/useSendFlowEnsResolutions.ts

@@ -0,0 +1,80 @@
+import { useCallback } from 'react';
+
+interface CacheEntry {
+  ensName: string;
+  timestamp: number;
+}
+
+const CACHE_TTL = 5 * 60 * 1000;
+
+const ensResolutionCache = new Map<string, CacheEntry>();
+
+const createCacheKey = (chainId: string, address: string) =>
+  `${chainId}:${address}`;
+
+const isCacheEntryValid = (entry: CacheEntry): boolean =>
+  Date.now() - entry.timestamp < CACHE_TTL;
+
+// This hook is used to store and retrieve ENS resolutions for a given chain and address with short living cache
+// especially to keep consistency of Name component in send flow
+export const useSendFlowEnsResolutions = () => {
+  const setResolvedAddress = useCallback(
+    (chainId: string, ensName: string, address: string) => {
+      if (
+        !isValidString(chainId) ||
+        !isValidString(address) ||
+        !isValidString(ensName)
+      ) {
+        return;
+      }
+
+      const lowerCaseChainId = chainId.toLowerCase();
+      const lowerCaseAddress = address.toLowerCase();
+      const lowerCaseEnsName = ensName.toLowerCase();
+
+      ensResolutionCache.set(
+        createCacheKey(lowerCaseChainId, lowerCaseAddress),
+        {
+          ensName: lowerCaseEnsName,
+          timestamp: Date.now(),
+        },
+      );
+    },
+    [],
+  );
+
+  const getResolvedENSName = useCallback(
+    (chainId: string, address: string): string | undefined => {
+      if (!isValidString(chainId) || !isValidString(address)) {
+        return undefined;
+      }
+
+      const lowerCaseChainId = chainId.toLowerCase();
+      const lowerCaseAddress = address.toLowerCase();
+
+      const entry = ensResolutionCache.get(
+        createCacheKey(lowerCaseChainId, lowerCaseAddress),
+      );
+      if (entry && isCacheEntryValid(entry)) {
+        return entry.ensName;
+      }
+
+      if (entry) {
+        ensResolutionCache.delete(
+          createCacheKey(lowerCaseChainId, lowerCaseAddress),
+        );
+      }
+      return undefined;
+    },
+    [],
+  );
+
+  return {
+    setResolvedAddress,
+    getResolvedENSName,
+  };
+};
+
+function isValidString(value: unknown) {
+  return typeof value === 'string' && value.length > 0;
+}

app/components/hooks/DisplayName/useDisplayName.test.ts

@@ -8,6 +8,7 @@ import { useWatchedNFTNames } from './useWatchedNFTNames';
 import { useNftNames } from './useNftName';
 import { useAccountNames } from './useAccountNames';
 import { useAccountWalletNames } from './useAccountWalletNames';
+import { useSendFlowEnsResolutions } from '../../Views/confirmations/hooks/send/useSendFlowEnsResolutions';
 
 const UNKNOWN_ADDRESS_CHECKSUMMED =
   '0x299007B3F9E23B8d432D5f545F8a4a2B3E9A5B4e';
@@ -43,6 +44,15 @@ jest.mock('./useAccountWalletNames', () => ({
   useAccountWalletNames: jest.fn(),
 }));
 
+jest.mock(
+  '../../Views/confirmations/hooks/send/useSendFlowEnsResolutions',
+  () => ({
+    useSendFlowEnsResolutions: jest.fn(() => ({
+      getResolvedENSName: jest.fn(),
+    })),
+  }),
+);
+
 describe('useDisplayName', () => {
   const mockUseWatchedNFTNames = jest.mocked(useWatchedNFTNames);
   const mockUseFirstPartyContractNames = jest.mocked(
@@ -52,6 +62,8 @@ describe('useDisplayName', () => {
   const mockUseNFTNames = jest.mocked(useNftNames);
   const mockUseAccountNames = jest.mocked(useAccountNames);
   const mockUseAccountWalletNames = jest.mocked(useAccountWalletNames);
+  const mockUseSendFlowEnsResolutions = jest.mocked(useSendFlowEnsResolutions);
+  const mockGetResolvedENSName = jest.fn();
 
   beforeEach(() => {
     jest.resetAllMocks();
@@ -61,6 +73,9 @@ describe('useDisplayName', () => {
     mockUseNFTNames.mockReturnValue([]);
     mockUseAccountNames.mockReturnValue([]);
     mockUseAccountWalletNames.mockReturnValue([]);
+    mockUseSendFlowEnsResolutions.mockReturnValue({
+      getResolvedENSName: mockGetResolvedENSName,
+    } as unknown as ReturnType<typeof useSendFlowEnsResolutions>);
   });
 
   describe('unknown address', () => {
@@ -189,5 +204,23 @@ describe('useDisplayName', () => {
         }),
       );
     });
+
+    it('returns ENS name', () => {
+      mockUseSendFlowEnsResolutions.mockReturnValue({
+        getResolvedENSName: jest.fn().mockReturnValue('ensname.eth'),
+      } as unknown as ReturnType<typeof useSendFlowEnsResolutions>);
+
+      const displayName = useDisplayName({
+        type: NameType.EthereumAddress,
+        value: KNOWN_NFT_ADDRESS_CHECKSUMMED,
+        variation: CHAIN_IDS.MAINNET,
+      });
+
+      expect(displayName).toEqual(
+        expect.objectContaining({
+          name: 'ensname.eth',
+        }),
+      );
+    });
   });
 });

app/components/hooks/DisplayName/useDisplayName.ts

@@ -5,6 +5,7 @@ import { useERC20Tokens } from './useERC20Tokens';
 import { useNftNames } from './useNftName';
 import { useAccountNames } from './useAccountNames';
 import { useAccountWalletNames } from './useAccountWalletNames';
+import { useSendFlowEnsResolutions } from '../../Views/confirmations/hooks/send/useSendFlowEnsResolutions';
 
 export interface UseDisplayNameRequest {
   preferContractSymbol?: boolean;
@@ -99,18 +100,21 @@ export function useDisplayNames(
   const nftNames = useNftNames(requests);
   const accountNames = useAccountNames(requests);
   const accountWalletNames = useAccountWalletNames(requests);
+  const { getResolvedENSName } = useSendFlowEnsResolutions();
 
-  return requests.map((_request, index) => {
+  return requests.map(({ value, variation }, index) => {
     const watchedNftName = watchedNftNames[index];
     const firstPartyContractName = firstPartyContractNames[index];
     const erc20Token = erc20Tokens[index];
     const { name: nftCollectionName, image: nftCollectionImage } =
       nftNames[index] || {};
     const accountName = accountNames[index];
     const subtitle = accountWalletNames[index];
+    const ensName = getResolvedENSName(variation, value);
 
     const name =
       accountName ||
+      ensName ||
       firstPartyContractName ||
       watchedNftName ||
       erc20Token?.name ||