feat(auth, multi-tenant): add multi-tenant (tenantID) support

packages/auth/__tests__/auth.test.ts

@@ -43,4 +43,23 @@ describe('Auth', function () {
       expect(bar).toEqual(['10.0.2.2', 9099]);
     });
   });
+
+  describe('tenantId', function () {
+    it('should be able to set tenantId ', function () {
+      const auth = firebase.app().auth();
+      auth.setTenantId('test-id').then(() => {
+        expect(auth.tenantId).toBe('test-id');
+      });
+    });
+
+    it('should throw error when tenantId is a non string object ', async function () {
+      try {
+        await firebase.app().auth().setTenantId(Object());
+        return Promise.reject('It should throw an error');
+      } catch (e) {
+        expect(e.message).toBe("firebase.auth().setTenantId(*) expected 'tenantId' to be a string");
+        return Promise.resolve('Error catched');
+      }
+    });
+  });
 });

packages/auth/android/src/main/java/io/invertase/firebase/auth/ReactNativeFirebaseAuthModule.java

@@ -1627,6 +1627,19 @@ public void setLanguageCode(String appName, String code) {
     }
   }
 
+  /**
+   * setTenantId
+   *
+   * @param appName
+   * @param tenantId
+   */
+  @ReactMethod
+  public void setTenantId(String appName, String tenantId) {
+    FirebaseApp firebaseApp = FirebaseApp.getInstance(appName);
+    FirebaseAuth firebaseAuth = FirebaseAuth.getInstance(firebaseApp);
+    firebaseAuth.setTenantId(tenantId);
+  }
+
   /**
    * useDeviceLanguage
    *

packages/auth/ios/RNFBAuth/RNFBAuthModule.m

@@ -900,6 +900,13 @@ - (void)invalidate {
 
 }
 
+RCT_EXPORT_METHOD(setTenantId:
+  (FIRApp *) firebaseApp
+    :(NSString *) tenantID
+) {
+    FIRAuth authWithApp:firebaseApp].tenantID = tenantID;
+}
+
 RCT_EXPORT_METHOD(useDeviceLanguage:
   (FIRApp *) firebaseApp
 ) {

packages/auth/lib/index.d.ts

@@ -1201,6 +1201,16 @@ export namespace FirebaseAuthTypes {
    * TODO @salakar missing updateCurrentUser
    */
   export class Module extends FirebaseModule {
+    /**
+     * Returns the current tenant Id or null if it has never been set
+     *
+     * #### Example
+     *
+     * ```js
+     * const tenantId = firebase.auth().tenantId;
+     * ```
+     */
+    tenantId: string | null;
     /**
      * Returns the current language code.
      *
@@ -1228,6 +1238,20 @@ export namespace FirebaseAuthTypes {
      * > It is recommended to use {@link auth#onAuthStateChanged} to track whether the user is currently signed in.
      */
     currentUser: User | null;
+
+    /**
+     * Sets the tenant id.
+     *
+     * #### Example
+     *
+     * ```js
+     * await firebase.auth().setTenantId('tenant-123');
+     * ```
+     *
+     * @param tenantId the tenantID current app bind to.
+     */
+    setTenantId(tenantId: string): Promise<void>;
+
     /**
      * Sets the language code.
      *

packages/auth/lib/index.js

@@ -69,6 +69,7 @@ class FirebaseAuthModule extends FirebaseModule {
     this._settings = null;
     this._authResult = false;
     this._languageCode = this.native.APP_LANGUAGE[this.app._name];
+    this._tenantId = null;
 
     if (!this.languageCode) {
       this._languageCode = this.native.APP_LANGUAGE['[DEFAULT]'];
@@ -101,6 +102,10 @@ class FirebaseAuthModule extends FirebaseModule {
     return this._languageCode;
   }
 
+  get tenantId() {
+    return this._tenantId;
+  }
+
   get settings() {
     if (!this._settings) {
       this._settings = new Settings(this);
@@ -150,6 +155,14 @@ class FirebaseAuthModule extends FirebaseModule {
     }
   }
 
+  async setTenantId(tenantId) {
+    if (!isString(tenantId)) {
+      throw new Error("firebase.auth().setTenantId(*) expected 'tenantId' to be a string");
+    }
+    this._tenantId = tenantId;
+    await this.native.setTenantId(tenantId);
+  }
+
   _parseListener(listenerOrObserver) {
     return typeof listenerOrObserver === 'object'
       ? listenerOrObserver.next.bind(listenerOrObserver)