ibms-dome/FrontendWebApi/ApiControllers/OAuthController.cs

using Autodesk.Forge;
using Microsoft.AspNetCore.Mvc;
using System.Threading.Tasks;
using System;

namespace FrontendWebApi.ApiControllers
{
    public class OAuthController : ControllerBase //MyBaseApiController<OAuthController>//Controller
    {


        private static dynamic InternalToken { get; set; }
        private static dynamic PublicToken { get; set; }

        /// <summary>
        /// Get access token with public (viewables:read) scope
        /// </summary>
        [HttpGet]
        [Route("api/forge/oauth/token")]
        public async Task<dynamic> GetPublicAsync()
        {
            if (PublicToken == null || PublicToken.ExpiresAt < DateTime.UtcNow)
            {
                PublicToken = await Get2LeggedTokenAsync(new Scope[] { Scope.ViewablesRead });
                PublicToken.ExpiresAt = DateTime.UtcNow.AddSeconds(PublicToken.expires_in);
            }
            return PublicToken;
        }

        /// <summary>
        /// Get access token with internal (write) scope
        /// </summary>
        public static async Task<dynamic> GetInternalAsync()
        {
            if (InternalToken == null || InternalToken.ExpiresAt < DateTime.UtcNow)
            {
                InternalToken = await Get2LeggedTokenAsync(new Scope[] { Scope.BucketCreate, Scope.BucketRead, Scope.BucketDelete, Scope.DataRead, Scope.DataWrite, Scope.DataCreate, Scope.CodeAll });
                InternalToken.ExpiresAt = DateTime.UtcNow.AddSeconds(InternalToken.expires_in);
            }

            return InternalToken;
        }

        /// <summary>
        /// Get the access token from Autodesk
        /// </summary>
        private static async Task<dynamic> Get2LeggedTokenAsync(Scope[] scopes)
        {
            TwoLeggedApi oauth = new TwoLeggedApi();
            string grantType = "client_credentials";
            dynamic bearer = await oauth.AuthenticateAsync(
              "zO4ZGuyALhjrL5o81vA39Pkdgr82WAmq",
              "Bz5KyXqP6UqgGhxm",
              grantType,
              scopes);
            return bearer;
        }

        /// <summary>
        /// Reads appsettings from web.config
        /// </summary>
        public static string GetAppSetting(string settingKey)
        {
            return Environment.GetEnvironmentVariable(settingKey).Trim();
        }
    }
}