How to do sign out from MSAL authentication.? - xamarin

Question

I am working on xamarin forms where I am using MSAL for authentication to authenticate. Now I want to sign out the user once he clicks on the sign-out. For sign out, I wrote Below code
foreach (var user in await App.PCA.GetAccountsAsync())
{
await App.PCA.RemoveAsync(user);
}
The above code is executing without any problem but when I again try to log in it is not asking for the password. I am clearing the cookies from the app using dependency service like
created one interface in xamarin forms project
public interface IAuthentication
{
void ClearAllCookies();
}
And in the android project providing the implementation for the interface
public void ClearAllCookies()
{
CookieManager.Instance.RemoveSessionCookie();
CookieManager.Instance.RemoveAllCookie();
}
I am doing Authentication like below
In App.xamal.cs file
public static IPublicClientApplication PCA = null;
public static string ClientID = "xxxxxxxxxxxxxxxxxxxx";
public static string[] Scopes = { "User.Read" };
public App()
{
PCA = PublicClientApplicationBuilder.Create(ClientID)
.WithRedirectUri($"msal{ClientID}://auth")
.Build();
InitializeComponent();
}
//On login button click
AuthenticationResult authResult = null;
IEnumerable<IAccount> accounts = await App.PCA.GetAccountsAsync();
try
{
IAccount firstAccount = accounts.FirstOrDefault();
authResult = await App.PCA.AcquireTokenSilent(App.Scopes, firstAccount)
.ExecuteAsync();
}
catch (MsalUiRequiredException)
{
try
{
authResult = await App.PCA.AcquireTokenInteractive(App.Scopes)
.WithLoginHint(EmailId) //Here I am passing Email Id
.WithParentActivityOrWindow(App.ParentWindow)
.ExecuteAsync();
}
catch (Exception ex2)
{
await DisplayAlert("Acquire token interactive failed. See exception message for details: ", ex2.Message, "Dismiss");
}
}
if (authResult != null)
{
var content = await GetHttpContentWithTokenAsync(authResult.AccessToken);
await Navigation.PushModalAsync(new Dashboard.PartnerDashboard(content));
}
}
After clearing again it is not asking for the password. If I uninstall and reinstall the app also it is not asking for the password. How to resolve this?

Answer 1

Can you try with the below code for clearing accounts in MSAL.
public void ClearAllCookies(string authority)
{
var authContext = new AuthenticationContext(authority);
authContext.TokenCache.Clear();
CookieManager.Instance.RemoveSessionCookie();
CookieManager.Instance.RemoveAllCookie();
}
where authority = "https://login.windows.net/common";
Try below code before authenticate code running, for removing old accounts.
var authContext = new AuthenticationContext(authority);
if(authContext.TokenCache.ReadItems().Any())
{
authContext = new AuthenticationContext(authContext.TokenCache.ReadItems().First().Authority,false, null);
}