public async Task <TokenResultModel> GetTokenForAsync(string resource, IEnumerable <string> scopes = null)
{
ClientCredential clientCred = new ClientCredential(_aadClientId, _appSecret);
ClaimsPrincipal current = ClaimsPrincipal.Current;
if (current == null)
{
throw new AuthenticationException("Missing claims principal.");
}
System.IdentityModel.Tokens.BootstrapContext bootstrapContext = new System.IdentityModel.Tokens.BootstrapContext(current.Identities.First().BootstrapContext.ToString());
if (bootstrapContext == null)
{
throw new AuthenticationException("bootstrapContext is null.");
}
string userName = current.FindFirst(ClaimTypes.Upn) != null
? current.FindFirst(ClaimTypes.Upn).Value
: current.FindFirst(ClaimTypes.Email).Value;
string userAccessToken = bootstrapContext.Token;
UserAssertion userAssertion = new UserAssertion(userAccessToken, kGrantType, userName);
string authority = String.Format(CultureInfo.InvariantCulture, _aadInstance, _aadTenant);
string userId = ClaimsPrincipal.Current.FindFirst(ClaimTypes.NameIdentifier).Value;
AuthenticationContext authContext = new AuthenticationContext(authority);
string userObjectID = (ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier"))?.Value;
var user = new UserIdentifier(userObjectID, UserIdentifierType.UniqueId);
try
{
_result = await authContext.AcquireTokenAsync(resource, clientCred, userAssertion);
return(_result.ToTokenResult());
}
catch (AdalException ex)
{
throw new AuthenticationException(
$"Failed to authenticate on behalf of {userName}", ex);
}
}