public Task <IdentityUser> FindAsync(UserLoginInfo login)
{
if (login == null)
{
throw new ArgumentNullException("login");
}
IdentityUser identityUser = null;
var byProviderAndKey = _externalLoginRepository.GetByProviderAndKey(login.LoginProvider, login.ProviderKey);
if (byProviderAndKey != null)
{
identityUser = GetIdentityUser(byProviderAndKey.User);
}
return(Task.FromResult(identityUser));
}
