Authentication Provider

This Widget is modeled after the provider package but specifically for the authentication workflow.

Example

class _MyAppState extends State<MyApp> {
  AuthenticationController controller;

  @override
  void initState() {
    super.initState();
    controller = AuthenticationController<User>(context);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: AuthenticationProvider<User>(
            controller: controller,
            builder: (context) {
              var state = AuthenticationProvider.of<User>(context).state;
              if (state is AuthState.Loading) {
                return Scaffold(
                  appBar: AppBar(
                    title: const Text('Loading'),
                  ),
                  body: Center(
                    child: CircularProgressIndicator(),
                  ),
                );
              } else if (state is AuthState.Unauthenticated) {
                return Scaffold(
                  appBar: AppBar(
                    title: const Text('Unauthenticated'),
                  ),
                  body: Center(
                    child: Column(children: [
                      Text('Woops, you are not authenticated.'),
                      FlatButton(
                        child: Text('Sign In'),
                        onPressed: () => controller.authenticate(user: User()),
                      )
                    ]),
                  ),
                );
              } else if (state is AuthState.Authenticated<User>) {
                return Scaffold(
                  appBar: AppBar(
                    title: const Text('Authenticated'),
                  ),
                  body: Center(
                    child: Column(children: [
                      Text(
                          'Congratulations, you (${state.user.name}) are authenticated.'),
                      FlatButton(
                        child: Text('Log Out'),
                        onPressed: () => controller.deauthenticate(),
                      )
                    ]),
                  ),
                );
              }
              Future.delayed(Duration(seconds: 1), () {
                controller.initialize();
              });
              return Scaffold(
                appBar: AppBar(
                  title: const Text('Uninitialized'),
                ),
                body: Center(
                  child: Text(''),
                ),
              );
            }));
  }
}

class User {
  String name = 'Nathaniel';
}

Usage

For most users the only classes of concern are AuthenticationState and AuthenticationProvider.

AuthenticationProvider should be placed at the top of the widget tree in order to redraw the widget tree if a user is de-authenticated. You will need to pass an AuthenticationController to the provider, which has many optional parameters.

Libraries

authentication_controller
authentication_provider
authentication_state