使用 Azure AD B2C 登录 Xamarin Android 应用

经过一周的研究可与 Azure AD B2C 一起使用 Xamarin 以 Android 平台（而不是 Xamarin.Forms）为目标的身份验证原理后，我终于寻求一些建议。

我有一个带有“登录”按钮的活动，我想通过按钮的触摸事件登录到 Azure。理想情况下，我希望在登录步骤完成后收到令牌。

这是我到目前为止的代码：

public class MainActivity : Activity
{
    public TaskCompletionSource<bool> ActivityResult { get; set; }
    public const int LocationActivityResult = 110;
    private static string AadInstance = "https://login.microsoftonline.com/{0}.onmicrosoft.com/";

    private PublicClientApplication _publicClientApplication;
    private string _authority;
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.Main);

        //partie pour le sign in 

        EditText editTextEmail = FindViewById<EditText>(Resource.Id.editTextEmail);
        EditText editTextPassword = FindViewById<EditText>(Resource.Id.editTextPassword);
        Button signIn = FindViewById<Button>(Resource.Id.buttonSignIn);

        signIn.Click += async (sender, e) =>
        {

            ConnectivityManager connectivityManager = (ConnectivityManager)GetSystemService(ConnectivityService);
            NetworkInfo networkInfo = connectivityManager.ActiveNetworkInfo;
            if (networkInfo == null)
            {
                Toast.MakeText(this, "Aucune connexion internet", ToastLength.Short).Show();
                Intent intent = new Intent(this.ApplicationContext, typeof(NotInternetActivity));
                intent.SetFlags(ActivityFlags.NewTask);
                StartActivity(intent);
            }
            else
            {

                /////essai pour la connexion
                _authority = string.Format(AadInstance, _azureSettings.Tenant);
                _publicClientApplication = new PublicClientApplication(
                    _authority,
                    _azureSettings.ClientId

                );
                await AcquireTokenAsync();

                /////passe sur la nouvelle actvité

                Intent intent = new Intent(this.ApplicationContext, typeof(PlantsActivity));
                intent.SetFlags(ActivityFlags.NewTask);
                StartActivity(intent);

            }

        };

    }
    Authentication _azureSettings = new Authentication
    {
        ClientId = "ClientId",
        ForgotPasswordPolicy = "ForgotPasswordPolicy",
        SignInOrSignUpPolicy = "SignInOrSignUpPolicy",
        Tenant = "Tenant"

    };

    protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
    {
        base.OnActivityResult(requestCode, resultCode, data);
        if (requestCode.Equals(LocationActivityResult))
        {
            if (CrossGeolocator.Current.IsGeolocationEnabled)
                this.ActivityResult.TrySetResult(true);
            else
                this.ActivityResult.TrySetResult(false);
        }
        else
        {
            AuthenticationAgentContinuationHelper.SetAuthenticationAgentContinuationEventArgs(requestCode, resultCode, data);
        }
    }

    public class Authentication
    {
        public string Tenant { get; set; }
        public string ClientId { get; set; }
        public string SignInOrSignUpPolicy { get; set; }
        public string ForgotPasswordPolicy { get; set; }
    }

    public Task<AuthenticationResult> AcquireTokenSilentAsync()
    {
        string[] scopes = { _azureSettings.ClientId };
        var res = _publicClientApplication.AcquireTokenSilentAsync(scopes, "", _authority, _azureSettings.SignInOrSignUpPolicy, false);
        return _publicClientApplication.AcquireTokenSilentAsync(scopes, "", _authority, _azureSettings.SignInOrSignUpPolicy, false);
    }

    public async Task<AuthenticationResult> AcquireTokenAsync()
    {
        string[] scopes = { _azureSettings.ClientId };
        return await _publicClientApplication.AcquireTokenAsync(scopes, "", UiOptions.SelectAccount, string.Empty, null, _authority, _azureSettings.SignInOrSignUpPolicy);
    }
}

我现在已将所有内容放在同一类中，只是为了测试结果。您可以给我提供的任何示例或您也可以指出我的有关 Xamarin.Android 的任何文档都会非常有帮助。

提前致谢。

所以在花了几周时间之后我终于能够做到了。

因此，我的应用程序现在有一个 Azure AD B2C 后端，我可以从 Xamarin Android（本机）应用程序进行身份验证并从我的 Easy Tables 访问数据。

下面是它的工作原理：

您需要做的第一件事是从 Azure B2C 获取令牌，因此一旦成功，authResult 将保存新用户，您可以在其中访问令牌和用户名。

PublicClientApplication publicClientApplication = new PublicClientApplication(AuthParameters.Authority, AuthParameters.ClientId);
var authResult = await publicClientApplication.AcquireTokenSilentAsync(AuthParameters.Scopes, "", AuthParameters.Authority, AuthParameters.Policy, false);
//      await Navigation.PushAsync(new SecurePage());
var result = authResult.Token;

            textbox.Text = authResult.User.Name;

第二件事是通过 loginasync 将令牌发送到您的 mobileserviceclient 。

JObject payload = new JObject();
payload["access_token"] = authResult.Token;
try
{
    var user = await MobileService.LoginAsync(MobileServiceAuthenticationProvider.WindowsAzureActiveDirectory, payload);
}

这是存储所需数据的 AuthParameters 类：

public class AuthParameters
{
    public const string Authority = "https://login.microsoftonline.com/YOURSITE.onmicrosoft.com/";
    public const string ClientId = "Client ID from B2C APP";
    public static readonly string[] Scopes = { ClientId };
    public const string Policy = "POLICY_NAME_FROM_B2CTenant";
}

现在，在 azure 门户上，您应该有一个活动的 Azure B2C 应用程序和一个移动服务客户端。它们应该链接在一起，链接它们的方式是通过这个链接

https://developer.xamarin.com/guides/xamarin-forms/cloud-services/authentication/azure-ad-b2c-mobile-app/ https://developer.xamarin.com/guides/xamarin-forms/cloud-services/authentication/azure-ad-b2c-mobile-app/

现在您应该能够通过 MobileServiceClient 正常访问您的简单表