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docs(firebase_auth): Update federated-auth.md for Facebook limited login #13416

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docs(firebase_auth): Update federated-auth.md for Facebook limited login #13416

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ce23503
Update federated-auth.md for Facebook limited login
lachezartodorov Sep 26, 2024
c51caf7
Added code comments in federated-auth.md
lachezartodorov Sep 26, 2024
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16 changes: 14 additions & 2 deletions docs/auth/federated-auth.md
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Original file line number Diff line number Diff line change
Expand Up @@ -136,13 +136,25 @@ with the Facebook App ID and Secret set.

Future<UserCredential> signInWithFacebook() async {
// Trigger the sign-in flow
final rawNonce = _generateRandomString(); // You should implement this function
final nonce = _sha256ofString(rawNonce); // You should implement this function
final LoginResult loginResult = await FacebookAuth.instance.login();

// Create a credential from the access token
final OAuthCredential facebookAuthCredential = FacebookAuthProvider.credential(loginResult.accessToken.token);
OAuthCredential? facebookAuthCredential;
if (loginResult.accessToken is LimitedToken) {
facebookAuthCredential = OAuthCredential(
providerId: 'facebook.com',
signInMethod: 'oauth',
idToken: loginResult.accessToken.tokenString,
rawNonce: rawNonce,
);
} else {
facebookAuthCredential = FacebookAuthProvider.credential(loginResult.accessToken.token);
}

// Once signed in, return the UserCredential
return FirebaseAuth.instance.signInWithCredential(facebookAuthCredential);
return FirebaseAuth.instance.signInWithCredential(facebookAuthCredential!);
}
```

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