/// <summary>
/// Attempt to get a token from the cache without prompting the user for authentication.
/// </summary>
/// <param name="aadId"> The AAD ID for the user </param>
/// <param name="resourceId"> The resource we're authenticating against to obtain a token </param>
/// <returns> A token on success, null otherwise </returns>
public async Task <string> GetAccessTokenForMAM(string aadId, string resourceId)
{
_cachedResourceID = resourceId;
Log.Info(_logTagAuth, "Attempting to get access token for MAM with resource " + resourceId);
AuthenticationResult result = null;
try
{
var currentAccounts = await PCA.GetAccountsAsync();
if (currentAccounts.Count() > 0)
{
result = await PCA.AcquireTokenSilent(new string[] { resourceId + "/.default" }, currentAccounts.FirstOrDefault()).ExecuteAsync();
}
}
catch (MsalServiceException e)
{
// Expected if there is not token in the cache.
Log.Warn(_logTagAuth, "Encountered error when attempting to silently authenticate. " +
"Error code = " + e.ErrorCode + ". Message = " + e.Message, e);
}
return(result?.AccessToken);
}
/// <summary>
/// Attempt silent authentication through the broker.
/// </summary>
/// <param name="scopes"> The scopes we're authenticating against to obtain a token </param>
/// <returns> The AuthenticationResult on succes, null otherwise</returns>
public async Task <AuthenticationResult> SignInSilent(IEnumerable <string> scopes)
{
AuthenticationResult result;
try
{
Log.Info(_logTagAuth, "Attempting silent authentication.");
var currentAccounts = await PCA.GetAccountsAsync();
if (currentAccounts.Count() > 0)
{
result = await PCA.AcquireTokenSilent(scopes, currentAccounts.FirstOrDefault()).ExecuteAsync();
}
else
{
Log.Warn(_logTagAuth, "No AAD ID provided, continuing silent authentication attempt.");
//result = await AuthContext.AcquireTokenSilentAsync(resourceId, _clientID);
return(null);
}
}
catch (MsalUiRequiredException e)
{
// Expected if there is not token in the cache.
Log.Warn(_logTagAuth, "Encountered error when attempting to silently authenticate. " +
"Error code = " + e.ErrorCode + ". Message = " + e.Message, e);
return(null);
}
return(result);
}