Skip to main content

Logging in a User

To login in a user, you can use the login method. It will trigger login flow will navigate the user to a browser model allowing the user to login into the service. You can pass in the supported providers to the login method for specific social logins such as GOOGLE, APPLE, FACEBOOK, etc., and do whitelabel login.

Parameters​

The login method takes in LoginParams as a required input.

ParameterDescription
loginProviderIt sets the oAuth login method to be used. You can use any of the supported values are google, facebook, reddit, discord, twitch, apple, line, github, kakao, linkedin, twitter, email_passwordless, jwt, sms_passwordless, email_password, and farcaster.
extraLoginOptions?It can be used to set the OAuth login options for corresponding loginProvider. For instance, you'll need to pass user's email address as. Default value for the field is null, and it accepts ExtraLoginOptions as a value.
redirectUrl?Url where user will be redirected after successfull login. By default user will be redirected to same page where login will be initiated. Default value for the field is null
appState?It can be used to keep track of the app state when user will be redirected to app after login. Default is null, and accepts String as a value.
mfaLevel?Customize the MFA screen shown to the user during OAuth authentication. Default value for field is MFALevel.DEFAULT, which shows MFA screen every 3rd login. It accepts MFALevel as a value.
dappShare?Custom verifier logins can get a dapp share returned to them post successful login. This is useful if the dapps want to use this share to allow users to login seamlessly. It accepts String as a value.
curve?It will be used to determine the public key encoded in the jwt token which returned in getUserInfo function after user login. This parameter won't change format of private key returned by We3Auth. Private key returned by getPrivKey is always secp256k1. To get the ed25519 key you can use getEd25519PrivKey method. The default value is Curve.secp256k1.

Usage​

final Web3AuthResponse response = await Web3AuthFlutter.login(
  LoginParams(loginProvider: Provider.google)
);

Examples​

Usage
Future<void> initWeb3Auth() async {
  Uri redirectUrl;

  if (Platform.isAndroid) {
    redirectUrl = Uri.parse('{SCHEME}://{HOST}/auth');
    // w3a://com.example.w3aflutter/auth
  } else if (Platform.isIOS) {
    redirectUrl = Uri.parse('{bundleId}://auth');
    // com.example.w3aflutter://openlogin
  } else {
    throw UnKnownException('Unknown platform');
  }

  await Web3AuthFlutter.init(Web3AuthOptions(
    clientId: "WEB3AUTH_CLIENT_ID",
    network: Network.sapphire_mainnet,
    redirectUrl: redirectUrl,
  ));

  await Web3AuthFlutter.initialize();
}

// Login
final Web3AuthResponse response = await Web3AuthFlutter.login(
  LoginParams(loginProvider: Provider.google)
);
On this page