Add ActionCodeSettings.linkDomain and deprecate ActionCodeSettings.dynamicLinkDomain (#8738)

* Add linkDomain field to ActionCodeSettings (#8428)

* Add linkDomain field to ActionCodeSettings

* Update API reports

* Update error message for ERROR_INVALID_HOSTING_LINK_DOMAIN to include that default hosting domains cannot be used.

* Use constants for test values

---------

Co-authored-by: NhienLam <[email protected]>

* FDL Deprecation & Hosting link Integration Test (#8603)

* Implement Integration test for passwordless email sign-in via firebase-hosting links.

* Add license to new test file created' did not match any files

* Remove unwanted _

* Add support for setting custom hosting link domain in test app (#8614)

* Add afterEach method and apply formatting to the hosting links integration test (#8615)

* Mark ActionCodeSettings.dynamicLinkDomain as deprecated

* Add changeset

* Update API reports

* Address review comments

* Fix changeset

* Update refdocs and address review comments

* Update deprecated comment

* Add FDL deprecation FAQ link

* Fix linkDomain link in refdocs

---------

Co-authored-by: NhienLam <[email protected]>
Co-authored-by: mansisampat <[email protected]>

Author: NhienLam

.changeset/polite-lies-vanish.md

@@ -0,0 +1,7 @@
+---
+'firebase': minor
+'@firebase/auth-types': minor
+'@firebase/auth': minor
+---
+
+Added `ActionCodeSettings.linkDomain` to customize the Firebase Hosting link domain that is used in mobile out-of-band email action flows. Also, deprecated `ActionCodeSettings.dynamicLinkDomain`.

common/api-review/auth.api.md

@@ -40,11 +40,13 @@ export interface ActionCodeSettings {
         minimumVersion?: string;
         packageName: string;
     };
+    // @deprecated
     dynamicLinkDomain?: string;
     handleCodeInApp?: boolean;
     iOS?: {
         bundleId: string;
     };
+    linkDomain?: string;
     url: string;
 }
 
@@ -236,6 +238,7 @@ export const AuthErrorCodes: {
     readonly MISSING_RECAPTCHA_VERSION: "auth/missing-recaptcha-version";
     readonly INVALID_RECAPTCHA_VERSION: "auth/invalid-recaptcha-version";
     readonly INVALID_REQ_TYPE: "auth/invalid-req-type";
+    readonly INVALID_HOSTING_LINK_DOMAIN: "auth/invalid-hosting-link-domain";
 };
 
 // @public

docs-devsite/auth.actioncodesettings.md

@@ -26,13 +26,14 @@ export interface ActionCodeSettings
 |  [dynamicLinkDomain](./auth.actioncodesettings.md#actioncodesettingsdynamiclinkdomain) | string | When multiple custom dynamic link domains are defined for a project, specify which one to use when the link is to be opened via a specified mobile app (for example, <code>example.page.link</code>). |
 |  [handleCodeInApp](./auth.actioncodesettings.md#actioncodesettingshandlecodeinapp) | boolean | When set to true, the action code link will be be sent as a Universal Link or Android App Link and will be opened by the app if installed. |
 |  [iOS](./auth.actioncodesettings.md#actioncodesettingsios) | { bundleId: string; } | Sets the iOS bundle ID. |
+|  [linkDomain](./auth.actioncodesettings.md#actioncodesettingslinkdomain) | string | The optional custom Firebase Hosting domain to use when the link is to be opened via a specified mobile app. The domain must be configured in Firebase Hosting and owned by the project. This cannot be a default Hosting domain (<code>web.app</code> or <code>firebaseapp.com</code>). |
 |  [url](./auth.actioncodesettings.md#actioncodesettingsurl) | string | Sets the link continue/state URL. |
 
 ## ActionCodeSettings.android
 
 Sets the Android package name.
 
-This will try to open the link in an android app if it is installed. If `installApp` is passed, it specifies whether to install the Android app if the device supports it and the app is not already installed. If this field is provided without a `packageName`<!-- -->, an error is thrown explaining that the `packageName` must be provided in conjunction with this field. If `minimumVersion` is specified, and an older version of the app is installed, the user is taken to the Play Store to upgrade the app.
+This will try to open the link in an Android app if it is installed.
 
 <b>Signature:</b>
 
@@ -46,6 +47,11 @@ android?: {
 
 ## ActionCodeSettings.dynamicLinkDomain
 
+> Warning: This API is now obsolete.
+> 
+> Firebase Dynamic Links is deprecated and will be shut down as early as August 2025. Instead, use [ActionCodeSettings.linkDomain](./auth.actioncodesettings.md#actioncodesettingslinkdomain) to set a custom domain for mobile links. Learn more in the [Dynamic Links deprecation FAQ](https://firebase.google.com/support/dynamic-links-faq)<!-- -->.
+> 
+
 When multiple custom dynamic link domains are defined for a project, specify which one to use when the link is to be opened via a specified mobile app (for example, `example.page.link`<!-- -->).
 
 <b>Signature:</b>
@@ -72,8 +78,6 @@ Sets the iOS bundle ID.
 
 This will try to open the link in an iOS app if it is installed.
 
-App installation is not supported for iOS.
-
 <b>Signature:</b>
 
 ```typescript
@@ -82,11 +86,21 @@ iOS?: {
     };
 ```
 
+## ActionCodeSettings.linkDomain
+
+The optional custom Firebase Hosting domain to use when the link is to be opened via a specified mobile app. The domain must be configured in Firebase Hosting and owned by the project. This cannot be a default Hosting domain (`web.app` or `firebaseapp.com`<!-- -->).
+
+<b>Signature:</b>
+
+```typescript
+linkDomain?: string;
+```
+
 ## ActionCodeSettings.url
 
 Sets the link continue/state URL.
 
-This has different meanings in different contexts: - When the link is handled in the web action widgets, this is the deep link in the `continueUrl` query parameter. - When the link is handled in the app directly, this is the `continueUrl` query parameter in the deep link of the Dynamic Link.
+This has different meanings in different contexts: - When the link is handled in the web action widgets, this is the deep link in the `continueUrl` query parameter. - When the link is handled in the app directly, this is the `continueUrl` query parameter in the deep link of the Dynamic Link or Hosting link.
 
 <b>Signature:</b>
 

docs-devsite/auth.md

@@ -1956,6 +1956,7 @@ AUTH_ERROR_CODES_MAP_DO_NOT_USE_INTERNALLY: {
     readonly MISSING_RECAPTCHA_VERSION: "auth/missing-recaptcha-version";
     readonly INVALID_RECAPTCHA_VERSION: "auth/invalid-recaptcha-version";
     readonly INVALID_REQ_TYPE: "auth/invalid-req-type";
+    readonly INVALID_HOSTING_LINK_DOMAIN: "auth/invalid-hosting-link-domain";
 }
 ```
 

packages/auth-types/index.d.ts

@@ -130,6 +130,7 @@ export type ActionCodeSettings = {
   iOS?: { bundleId: string };
   url: string;
   dynamicLinkDomain?: string;
+  linkDomain?: string;
 };
 
 export type AdditionalUserInfo = {

packages/auth/demo/public/index.html

@@ -823,6 +823,11 @@
                   <input type="text" class="form-control" id="ibi" placeholder="iOS Bundle ID"/>
                 </div>
               </form>
+              <div class="group">Mobile link</div>
+              <div class="form-group">
+                <input type="text" class="form-control" id="hostingLinkDomain"
+                       placeholder="Custom Hosting Link Domain"/>
+              </div>
               <form class="form form-bordered no-submit">
                 <div class="btn-group radio-block" id="handle-in-app-selection"
                      data-toggle="buttons">

packages/auth/demo/src/index.js

@@ -49,8 +49,8 @@ import {
   signInWithCredential,
   signInWithCustomToken,
   signInWithEmailAndPassword,
+  signInWithEmailLink,
   TotpMultiFactorGenerator,
-  TotpSecret,
   unlink,
   updateEmail,
   updatePassword,
@@ -995,6 +995,7 @@ function getActionCodeSettings() {
   const installApp = $('input[name=install-app]:checked').val() === 'Yes';
   const handleCodeInApp =
     $('input[name=handle-in-app]:checked').val() === 'Yes';
+  const hostingLinkDomain = $('#hostingLinkDomain').val();
   if (url || apn || ibi) {
     actionCodeSettings['url'] = url;
     if (apn) {
@@ -1010,6 +1011,9 @@ function getActionCodeSettings() {
       };
     }
     actionCodeSettings['handleCodeInApp'] = handleCodeInApp;
+    if (hostingLinkDomain) {
+      actionCodeSettings['linkDomain'] = hostingLinkDomain;
+    }
   }
   return actionCodeSettings;
 }
@@ -1020,6 +1024,7 @@ function onActionCodeSettingsReset() {
   $('#apn').val('');
   $('#amv').val('');
   $('#ibi').val('');
+  $('#hostingLinkDomain').val('');
 }
 
 /**

packages/auth/karma.conf.js

@@ -41,7 +41,8 @@ function getTestFiles(argv) {
       return [
         'test/integration/flows/totp.test.ts',
         'test/integration/flows/password_policy.test.ts',
-        'test/integration/flows/recaptcha_enterprise.test.ts'
+        'test/integration/flows/recaptcha_enterprise.test.ts',
+        'test/integration/flows/hosting_link.test.ts'
       ];
     }
     return argv.local

packages/auth/src/api/authentication/email_and_password.ts

@@ -70,6 +70,7 @@ export interface GetOobCodeRequest {
   dynamicLinkDomain?: string;
   tenantId?: string;
   targetProjectid?: string;
+  linkDomain?: string;
 }
 
 export interface VerifyEmailRequest extends GetOobCodeRequest {

packages/auth/src/api/errors.ts

@@ -100,7 +100,8 @@ export const enum ServerError {
   MISSING_RECAPTCHA_VERSION = 'MISSING_RECAPTCHA_VERSION',
   INVALID_RECAPTCHA_VERSION = 'INVALID_RECAPTCHA_VERSION',
   INVALID_REQ_TYPE = 'INVALID_REQ_TYPE',
-  PASSWORD_DOES_NOT_MEET_REQUIREMENTS = 'PASSWORD_DOES_NOT_MEET_REQUIREMENTS'
+  PASSWORD_DOES_NOT_MEET_REQUIREMENTS = 'PASSWORD_DOES_NOT_MEET_REQUIREMENTS',
+  INVALID_HOSTING_LINK_DOMAIN = 'INVALID_HOSTING_LINK_DOMAIN'
 }
 
 /**

packages/auth/src/core/errors.ts

@@ -134,7 +134,8 @@ export const enum AuthErrorCode {
   INVALID_RECAPTCHA_VERSION = 'invalid-recaptcha-version',
   INVALID_REQ_TYPE = 'invalid-req-type',
   UNSUPPORTED_PASSWORD_POLICY_SCHEMA_VERSION = 'unsupported-password-policy-schema-version',
-  PASSWORD_DOES_NOT_MEET_REQUIREMENTS = 'password-does-not-meet-requirements'
+  PASSWORD_DOES_NOT_MEET_REQUIREMENTS = 'password-does-not-meet-requirements',
+  INVALID_HOSTING_LINK_DOMAIN = 'invalid-hosting-link-domain'
 }
 
 function _debugErrorMap(): ErrorMap<AuthErrorCode> {
@@ -387,7 +388,10 @@ function _debugErrorMap(): ErrorMap<AuthErrorCode> {
     [AuthErrorCode.UNSUPPORTED_PASSWORD_POLICY_SCHEMA_VERSION]:
       'The password policy received from the backend uses a schema version that is not supported by this version of the Firebase SDK.',
     [AuthErrorCode.PASSWORD_DOES_NOT_MEET_REQUIREMENTS]:
-      'The password does not meet the requirements.'
+      'The password does not meet the requirements.',
+    [AuthErrorCode.INVALID_HOSTING_LINK_DOMAIN]:
+      'The provided Hosting link domain is not configured in Firebase Hosting or is not owned by ' +
+      'the current project. This cannot be a default Hosting domain (`web.app` or `firebaseapp.com`).'
   };
 }
 
@@ -598,5 +602,6 @@ export const AUTH_ERROR_CODES_MAP_DO_NOT_USE_INTERNALLY = {
   MISSING_CLIENT_TYPE: 'auth/missing-client-type',
   MISSING_RECAPTCHA_VERSION: 'auth/missing-recaptcha-version',
   INVALID_RECAPTCHA_VERSION: 'auth/invalid-recaptcha-version',
-  INVALID_REQ_TYPE: 'auth/invalid-req-type'
+  INVALID_REQ_TYPE: 'auth/invalid-req-type',
+  INVALID_HOSTING_LINK_DOMAIN: 'auth/invalid-hosting-link-domain'
 } as const;

packages/auth/src/core/strategies/action_code_settings.test.ts

@@ -26,6 +26,10 @@ describe('core/strategies/action_code_settings', () => {
   let auth: TestAuth;
   const request: GetOobCodeRequest = {};
 
+  const TEST_BUNDLE_ID = 'my-bundle';
+  const TEST_FDL_DOMAIN = 'fdl-domain';
+  const TEST_URL = 'my-url';
+
   beforeEach(async () => {
     auth = await testAuth();
   });
@@ -35,10 +39,10 @@ describe('core/strategies/action_code_settings', () => {
       _setActionCodeSettingsOnRequest(auth, request, {
         handleCodeInApp: true,
         iOS: {
-          bundleId: 'my-bundle'
+          bundleId: TEST_BUNDLE_ID
         },
         url: '',
-        dynamicLinkDomain: 'fdl-domain'
+        dynamicLinkDomain: TEST_FDL_DOMAIN
       })
     ).to.throw(FirebaseError, '(auth/invalid-continue-uri)');
   });
@@ -48,9 +52,9 @@ describe('core/strategies/action_code_settings', () => {
       _setActionCodeSettingsOnRequest(auth, request, {
         handleCodeInApp: true,
         iOS: {
-          bundleId: 'my-´bundle'
+          bundleId: TEST_BUNDLE_ID
         },
-        url: 'my-url'
+        url: TEST_URL
       })
     ).to.not.throw();
   });
@@ -60,23 +64,36 @@ describe('core/strategies/action_code_settings', () => {
       _setActionCodeSettingsOnRequest(auth, request, {
         handleCodeInApp: true,
         iOS: {
-          bundleId: 'my-´bundle'
+          bundleId: TEST_BUNDLE_ID
         },
-        url: 'my-url',
+        url: TEST_URL,
         dynamicLinkDomain: ''
       })
     ).to.throw(FirebaseError, '(auth/invalid-dynamic-link-domain)');
   });
 
+  it('should require a non empty Hosting link URL', () => {
+    expect(() =>
+      _setActionCodeSettingsOnRequest(auth, request, {
+        handleCodeInApp: true,
+        iOS: {
+          bundleId: TEST_BUNDLE_ID
+        },
+        url: TEST_URL,
+        linkDomain: ''
+      })
+    ).to.throw(FirebaseError, '(auth/invalid-hosting-link-domain)');
+  });
+
   it('should require a non-empty bundle ID', () => {
     expect(() =>
       _setActionCodeSettingsOnRequest(auth, request, {
         handleCodeInApp: true,
         iOS: {
           bundleId: ''
         },
-        url: 'my-url',
-        dynamicLinkDomain: 'fdl-domain'
+        url: TEST_URL,
+        dynamicLinkDomain: TEST_FDL_DOMAIN
       })
     ).to.throw(FirebaseError, '(auth/missing-ios-bundle-id)');
   });
@@ -88,8 +105,8 @@ describe('core/strategies/action_code_settings', () => {
         android: {
           packageName: ''
         },
-        url: 'my-url',
-        dynamicLinkDomain: 'fdl-domain'
+        url: TEST_URL,
+        dynamicLinkDomain: TEST_FDL_DOMAIN
       })
     ).to.throw(FirebaseError, '(auth/missing-android-pkg-name)');
   });

packages/auth/src/core/strategies/action_code_settings.ts

@@ -37,9 +37,16 @@ export function _setActionCodeSettingsOnRequest(
     auth,
     AuthErrorCode.INVALID_DYNAMIC_LINK_DOMAIN
   );
+  _assert(
+    typeof actionCodeSettings.linkDomain === 'undefined' ||
+      actionCodeSettings.linkDomain.length > 0,
+    auth,
+    AuthErrorCode.INVALID_HOSTING_LINK_DOMAIN
+  );
 
   request.continueUrl = actionCodeSettings.url;
   request.dynamicLinkDomain = actionCodeSettings.dynamicLinkDomain;
+  request.linkDomain = actionCodeSettings.linkDomain;
   request.canHandleCodeInApp = actionCodeSettings.handleCodeInApp;
 
   if (actionCodeSettings.iOS) {

packages/auth/src/core/strategies/email.test.ts

@@ -162,14 +162,16 @@ describe('core/strategies/sendEmailVerification', () => {
           bundleId: 'my-bundle'
         },
         url: 'my-url',
-        dynamicLinkDomain: 'fdl-domain'
+        dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain'
       });
 
       expect(mock.calls[0].request).to.eql({
         requestType: ActionCodeOperation.VERIFY_EMAIL,
         idToken,
         continueUrl: 'my-url',
         dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain',
         canHandleCodeInApp: true,
         iOSBundleId: 'my-bundle'
       });
@@ -190,13 +192,15 @@ describe('core/strategies/sendEmailVerification', () => {
           packageName: 'my-package'
         },
         url: 'my-url',
-        dynamicLinkDomain: 'fdl-domain'
+        dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain'
       });
       expect(mock.calls[0].request).to.eql({
         requestType: ActionCodeOperation.VERIFY_EMAIL,
         idToken,
         continueUrl: 'my-url',
         dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain',
         canHandleCodeInApp: true,
         androidInstallApp: false,
         androidMinimumVersionCode: 'my-version',
@@ -270,7 +274,8 @@ describe('core/strategies/verifyBeforeUpdateEmail', () => {
           bundleId: 'my-bundle'
         },
         url: 'my-url',
-        dynamicLinkDomain: 'fdl-domain'
+        dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain'
       });
 
       expect(mock.calls[0].request).to.eql({
@@ -279,6 +284,7 @@ describe('core/strategies/verifyBeforeUpdateEmail', () => {
         newEmail,
         continueUrl: 'my-url',
         dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain',
         canHandleCodeInApp: true,
         iOSBundleId: 'my-bundle'
       });
@@ -299,14 +305,16 @@ describe('core/strategies/verifyBeforeUpdateEmail', () => {
           packageName: 'my-package'
         },
         url: 'my-url',
-        dynamicLinkDomain: 'fdl-domain'
+        dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain'
       });
       expect(mock.calls[0].request).to.eql({
         requestType: ActionCodeOperation.VERIFY_AND_CHANGE_EMAIL,
         idToken,
         newEmail,
         continueUrl: 'my-url',
         dynamicLinkDomain: 'fdl-domain',
+        linkDomain: 'hosting-link-domain',
         canHandleCodeInApp: true,
         androidInstallApp: false,
         androidMinimumVersionCode: 'my-version',