[auth] Add OAuthProvider

android/src/main/java/io/invertase/firebase/auth/RNFirebaseAuth.java

@@ -38,6 +38,7 @@ import com.google.firebase.auth.FirebaseAuthInvalidCredentialsException;
 import com.google.firebase.auth.FirebaseAuthProvider;
 import com.google.firebase.auth.FirebaseUserMetadata;
 import com.google.firebase.auth.GithubAuthProvider;
+import com.google.firebase.auth.OAuthProvider;
 import com.google.firebase.auth.PhoneAuthCredential;
 import com.google.firebase.auth.PhoneAuthProvider;
 import com.google.firebase.auth.ProviderQueryResult;
@@ -1104,6 +1105,8 @@ class RNFirebaseAuth extends ReactContextBaseJavaModule {
         return TwitterAuthProvider.getCredential(authToken, authSecret);
       case "github.com":
         return GithubAuthProvider.getCredential(authToken);
+      case "oauth":
+        return OAuthProvider.getCredential(provider, authToken, authSecret);
       case "phone":
         // If the phone number is auto-verified quickly, then the verificationId can be null
         // We cached the credential as part of the verifyPhoneNumber request to be re-used here

ios/RNFirebase/auth/RNFirebaseAuth.m

@@ -1029,6 +1029,8 @@ RCT_EXPORT_METHOD(fetchProvidersForEmail:
         credential = [FIRGitHubAuthProvider credentialWithToken:authToken];
     } else if ([provider compare:@"phone" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
         credential = [[FIRPhoneAuthProvider provider] credentialWithVerificationID:authToken verificationCode:authTokenSecret];
+    } else if ([provider compare:@"oauth" options:NSCaseInsensitiveSearch] == NSOrderedSame) {
+        credential = [FIROAuthProvider credentialWithProviderID:@"oauth" IDToken:authToken accessToken:authTokenSecret];
     } else {
         NSLog(@"Provider not yet handled: %@", provider);
     }

lib/modules/auth/providers/OAuthProvider.js

@@ -0,0 +1,25 @@
+/**
+ * @flow
+ * OAuthProvider representation wrapper
+ */
+import type { AuthCredential } from '../types';
+
+const providerId = 'oauth';
+
+export default class OAuthProvider {
+  constructor() {
+    throw new Error('`new OAuthProvider()` is not supported on the native Firebase SDKs.');
+  }
+
+  static get PROVIDER_ID(): string {
+    return providerId;
+  }
+
+  static credential(idToken: string, accessToken: string): AuthCredential {
+    return {
+      token: idToken,
+      secret: accessToken,
+      providerId,
+    };
+  }
+}