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사용자 흐름 구성

Xamarin에 AAD B2C 인증을 추가합니다.형식

public static class Constants
{
    public static readonly string TenantName = "YourTenantName";
    public static readonly string TenantId = "YourTenantName.onmicrosoft.com";
    public static readonly string ClientId = "834a4112-0000-0000-0000-860f082f0c8a";
    public static readonly string SignInPolicy = "b2c_1_sisu_xamarin";
    public static readonly string IosKeychainSecurityGroups = "com.<yourcompany>.<groupname>"; // e.g com.contoso.aadb2cauthentication
    public static readonly string[] Scopes = new string[] { "openid", "offline_access" };
    public static readonly string AuthorityBase = $"https://{TenantName}.b2clogin.com/tfp/{TenantId}/";
    public static readonly string AuthoritySignIn = $"{AuthorityBase}{SignInPolicy}";
}

using Microsoft.Identity.Client;
using Xamarin.Forms;

namespace XamarinDemoWithB2C
{
    public partial class App : Application
    {
        public static IPublicClientApplication AuthenticationClient { get; private set; }

        public static object UIParent { get; set; } = null;

        public App()
        {
            InitializeComponent();

            AuthenticationClient = PublicClientApplicationBuilder.Create(Constants.ClientId)
               .WithIosKeychainSecurityGroup(Constants.IosKeychainSecurityGroups)
               .WithB2CAuthority(Constants.AuthoritySignIn)
               .WithRedirectUri($"msal{Constants.ClientId}://auth")
               .Build();

            MainPage = new NavigationPage(new LoginPage());
        }

        protected override void OnStart()
        {
        }

        protected override void OnSleep()
        {
        }

        protected override void OnResume()
        {
        }
    }
}

<ContentPage.Content>
    <StackLayout Margin="30,40,30,0" HorizontalOptions="Center" VerticalOptions="Center" >
    <Button x:Name="SignInBtn" Text="Sign in" Clicked="OnSignInClicked"/>
    </StackLayout>
</ContentPage.Content>

using System;
using System.Linq;
using Microsoft.Identity.Client;
using Xamarin.Forms;

namespace XamarinDemoWithB2C
{
    public partial class LoginPage : ContentPage
    {
        public LoginPage()
        {
            InitializeComponent();
        }

        protected override async void OnAppearing()
        {
            try
            {
                // Look for existing account
                var accounts = await App.AuthenticationClient.GetAccountsAsync();

                if (accounts.Count() >= 1)
                {
                    AuthenticationResult result = await App.AuthenticationClient
                        .AcquireTokenSilent(Constants.Scopes, accounts.FirstOrDefault())
                        .ExecuteAsync();

                    await Navigation.PushAsync(new LoginResultPage(result));
                }
            }
            catch
            {
                // Do nothing - the user isn't logged in
            }
            base.OnAppearing();
        }

        async void OnSignInClicked(object sender, EventArgs e)
        { 
            AuthenticationResult result;

            try
            {
                result = await App.AuthenticationClient
                    .AcquireTokenInteractive(Constants.Scopes)
                    .WithPrompt(Prompt.ForceLogin)
                    .WithParentActivityOrWindow(App.UIParent)
                    .ExecuteAsync();

                await Navigation.PushAsync(new LoginResultPage(result));
            }
            catch(MsalClientException)
            {

            }
        }
    }
}

<ContentPage.Content>
    <StackLayout Margin="0,30,30,0" HorizontalOptions="Center" VerticalOptions="Center">
        <Label x:Name="welcome"/>
        <Label x:Name="issuer"/>
        <Label x:Name="subject"/>
        <Label x:Name="audience"/>
        <Label x:Name="email"/>

        <StackLayout Margin="40,30,40,0" HorizontalOptions="Center" VerticalOptions="Center">
            <Button x:Name="SignOutBtn" Text="Sign out" Clicked="SignOutBtn_Clicked"/>
        </StackLayout>
    </StackLayout>
</ContentPage.Content>

using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using Microsoft.Identity.Client;
using Xamarin.Forms;

namespace XamarinDemoWithB2C
{
    public partial class LoginResultPage : ContentPage
    {
        private AuthenticationResult authenticationResult;

        public LoginResultPage(AuthenticationResult authResult)
        {
            authenticationResult = authResult;        
            InitializeComponent();
        }

        protected override void OnAppearing()
        {
            GetClaims();
            base.OnAppearing();
        }
        private void GetClaims()
        {
            var token = authenticationResult.IdToken;
            if (token != null)
            {
                var handler = new JwtSecurityTokenHandler();
                var data = handler.ReadJwtToken(authenticationResult.IdToken);
                var claims = data.Claims.ToList();
                if (data != null)
                { 
                    this.welcome.Text = $"Welcome {data.Claims.FirstOrDefault(x => x.Type.Equals("name")).Value}";
                    this.issuer.Text = $"Issuer: { data.Claims.FirstOrDefault(x => x.Type.Equals("iss")).Value}";
                    this.subject.Text = $"Subject: {data.Claims.FirstOrDefault(x => x.Type.Equals("sub")).Value}";
                    this.audience.Text = $"Audience: {data.Claims.FirstOrDefault(x => x.Type.Equals("aud")).Value}";
                    this.email.Text = $"Email: {data.Claims.FirstOrDefault(x => x.Type.Equals("emails")).Value}";
                }
            }
        }

        async void SignOutBtn_Clicked(System.Object sender, System.EventArgs e)
        {
            await App.AuthenticationClient.RemoveAsync(authenticationResult.Account);
            await Navigation.PushAsync(new LoginPage());
        }
    }
}

iOS별 구성

        base.OnCreate(savedInstanceState);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
        LoadApplication(new App());
        App.UIParent = this;
    }

    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }

    protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
    {
        base.OnActivityResult(requestCode, resultCode, data);
        AuthenticationContinuationHelper.SetAuthenticationContinuationEventArgs(requestCode, resultCode, data);
    }
}