feat(auth): add initial support for Apple auth provider

packages/auth/ios/RNFBAuth/RNFBAuthModule.m

@@ -878,6 +878,8 @@ - (FIRAuthCredential *)getCredentialForProvider:(NSString *)provider token:(NSSt
     credential = [FIRFacebookAuthProvider credentialWithAccessToken:authToken];
   } else if ([provider compare:@"google.com" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
     credential = [FIRGoogleAuthProvider credentialWithIDToken:authToken accessToken:authTokenSecret];
+  } else if ([provider compare:@"apple.com" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
+    credential = [FIROAuthProvider credentialWithProviderID:provider IDToken:authToken rawNonce:authTokenSecret];
   } else if ([provider compare:@"password" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
     credential = [FIREmailAuthProvider credentialWithEmail:authToken password:authTokenSecret];
   } else if ([provider compare:@"emailLink" options:NSCaseInsensitiveSearch] == NSOrderedSame) {

packages/auth/lib/index.d.ts

@@ -213,6 +213,16 @@ export namespace FirebaseAuthTypes {
      * ```
      */
     GoogleAuthProvider: AuthProvider;
+    /**
+     * Apple auth provider implementation.
+     *
+     * #### Example
+     *
+     * ```js
+     * firebase.auth.AppleAuthProvider;
+     * ```
+     */
+    AppleAuthProvider: AuthProvider;
     /**
      * Github auth provider implementation.
      *

packages/auth/lib/index.js

@@ -30,11 +30,13 @@ import GoogleAuthProvider from './providers/GoogleAuthProvider';
 import OAuthProvider from './providers/OAuthProvider';
 import PhoneAuthProvider from './providers/PhoneAuthProvider';
 import TwitterAuthProvider from './providers/TwitterAuthProvider';
+import AppleAuthProvider from './providers/AppleAuthProvider';
 import Settings from './Settings';
 import User from './User';
 import version from './version';
 
 const statics = {
+  AppleAuthProvider,
   EmailAuthProvider,
   PhoneAuthProvider,
   GoogleAuthProvider,

packages/auth/lib/providers/AppleAuthProvider.js

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2016-present Invertase Limited & Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this library except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+const providerId = 'apple.com';
+
+export default class AppleAuthProvider {
+  constructor() {
+    throw new Error('`new AppleAuthProvider()` is not supported on the native Firebase SDKs.');
+  }
+
+  static get PROVIDER_ID() {
+    return providerId;
+  }
+
+  static credential(token, secret) {
+    return {
+      token,
+      secret,
+      providerId,
+    };
+  }
+}