MachineToMachineAuth.cs

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using System;
using System.Net.Http;
using System.Threading.Tasks;
using IdentityModel.Client;
 
namespace AnalyzeRe.Authentication
{
    public class MachineToMachineAuth
    {
        public BearerAuthenticationToken AccessToken { get; private set; }
 
        public string ErrorDescription { get; private set; }
 
        private readonly string _clientId;
 
        private readonly string _secret;
 
        private readonly string _authEndpoint;
 
        private readonly string _scope;
        
        public MachineToMachineAuth(string clientId, string secret, string scope, string authEndpoint)
        {
            _clientId = clientId;
            _secret = secret;
            _scope = scope;
            _authEndpoint = authEndpoint;
        }
 
        public async Task<bool> Authorize()
        {
            var client = new HttpClient();
            var response = await client.RequestClientCredentialsTokenAsync(new ClientCredentialsTokenRequest
            {
                Address = _authEndpoint,
                ClientId = _clientId,
                ClientSecret = _secret,
                Scope = _scope
            });
 
            if (String.IsNullOrWhiteSpace(response.AccessToken))
            {
                ErrorDescription = response.ErrorDescription;
                return false;
            }
 
            AccessToken = new BearerAuthenticationToken(response.AccessToken, DateTime.UtcNow);
            return true;
        }
    }
}