From 8cc6f994cd8e9c3210032ef305ce052b58a1ac03 Mon Sep 17 00:00:00 2001
From: Andrei Lesnitsky <a@lesnitsky.dev>
Date: Thu, 2 Nov 2023 14:41:31 +0100
Subject: [PATCH] fix(ui_oauth_apple): fix AuthAction.link for Apple Sign In

---
 .../lib/src/provider.dart                     | 25 ++++++++++++-------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/packages/firebase_ui_oauth_apple/lib/src/provider.dart b/packages/firebase_ui_oauth_apple/lib/src/provider.dart
index 501b2881..fe5d28ee 100644
--- a/packages/firebase_ui_oauth_apple/lib/src/provider.dart
+++ b/packages/firebase_ui_oauth_apple/lib/src/provider.dart
@@ -56,15 +56,18 @@ class AppleProvider extends OAuthProvider {
   void mobileSignIn(AuthAction action) {
     authListener.onBeforeSignIn();
 
-    auth.signInWithProvider(firebaseAuthProvider).then((userCred) {
-      if (action == AuthAction.signIn) {
-        authListener.onSignedIn(userCred);
-      } else {
-        authListener.onCredentialLinked(userCred.credential!);
-      }
-    }).catchError((err) {
-      authListener.onError(err);
-    });
+    if (action == AuthAction.link) {
+      auth.currentUser
+          ?.linkWithProvider(firebaseAuthProvider)
+          .then(_onLinked)
+          .catchError(authListener.onError);
+      return;
+    }
+
+    auth
+        .signInWithProvider(firebaseAuthProvider)
+        .then(authListener.onSignedIn)
+        .catchError(authListener.onError);
   }
 
   @override
@@ -92,4 +95,8 @@ class AppleProvider extends OAuthProvider {
         platform == TargetPlatform.iOS ||
         platform == TargetPlatform.macOS;
   }
+
+  void _onLinked(fba.UserCredential userCredential) {
+    authListener.onCredentialLinked(userCredential.credential!);
+  }
 }