/// <summary>
/// Attempts to acquire access token from the token cache silently by calling AcquireTokenSilentAsync
/// </summary>
internal async Task <AuthenticationResult> GetAccessTokenSilentAsync(MsalAuthenticationProviderOption msalAuthProviderOption)
{
IAccount account = null;
if (msalAuthProviderOption.UserAccount?.ObjectId != null)
{
// Parse GraphUserAccount to IAccount instance
account = new GraphAccount(msalAuthProviderOption.UserAccount);
}
else
{
// If no graph user account is passed, try get the one in cache.
IEnumerable <IAccount> accounts = await ClientApplication.GetAccountsAsync();
account = accounts.FirstOrDefault();
}
if (account == null)
{
return(null);
}
try
{
return(await ClientApplication.AcquireTokenSilentAsync(
msalAuthProviderOption.Scopes ?? Scopes,
account,
ClientApplication.Authority,
msalAuthProviderOption.ForceRefresh));
}
catch (MsalUiRequiredException msalUiEx)
{
return(null);
}
catch (MsalServiceException serviceException)
{
throw new AuthenticationException(
new Error
{
Code = ErrorConstants.Codes.GeneralException,
Message = ErrorConstants.Message.UnexpectedMsalException
},
serviceException);
}
catch (Exception exception)
{
throw new AuthenticationException(
new Error
{
Code = ErrorConstants.Codes.GeneralException,
Message = ErrorConstants.Message.UnexpectedException
},
exception);
}
}
