Adsk.Platform.Authentication 0.0.8

Adsk.Platform.Authentication

The Adsk.Platform.DataManagement toolkit provides a set of APIs to interact with the Autodesk Authentication Service.

Installation

dotnet add package Adsk.Platform.Authentication

Usage

2 legged authentication

Getting a 2-legged access token is a common scenario. The SDK provides a helper class to simplify:

// Create a new instance of the AuthenticationClient
var authClient = new AuthenticationClient();

// Use helpers to get a 2-legged access token
 AuthTokenExtended authToken = await authClient.Helper.GetTwoLeggedToken(
	APS_CLIENT_ID, 
	APS_CLIENT_SECRET, 
	[AuthenticationScope.DataWrite, AuthenticationScope.DataRead]);

Here is an example of how to get the hub list:

using Autodesk.DataManagement;
using Autodesk.Authentication;

public async Task<Hubs> GetHub()
{

    var APS_CLIENT_ID="abcd"; // Replace with your client id
    var APS_CLIENT_SECRET="1234"; // Replace with your client secret

    AuthenticationClient authClient = new();

    async Task<string> getAccessToken()
    {
        var token = await authClient.Helper.GetTwoLeggedToken(APS_CLIENT_ID, APS_CLIENT_SECRET, [ AuthenticationScope.DataRead]);

        return token?.AccessToken is null ? throw new InvalidOperationException() : token.AccessToken;
    }

    var DMclient = new DataManagementClient(getAccessToken);

    var hubs = await DMclient.DataMgtApi.Project.V1.Hubs.GetAsync();

    return hubs;
}

3 legged authentication

This SDK depends on AspNet.Security.OAuth.Autodesk that leverages the ASP.NET Core authentication middleware to authenticate users with Autodesk.

1. In the program.cs file, add the authentication middleware:

   using Microsoft.AspNetCore.Authentication.Cookies;
   
   var builder = WebApplication.CreateBuilder(args);
   
   builder.Logging.ClearProviders();
   builder.Logging.AddConsole();
   
   builder.Services.AddControllers();
   
   //Define the default authentication scheme
   // The cookie contains the paths to your sign in and sign out endpoints
   builder.Services.AddAuthentication(options =>
   {
       options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
   })
   .AddCookie(options =>
   {
       options.LoginPath = "/signin";
       options.LogoutPath = "/signout";
   });
   
   // Add Autodesk authentication
   builder.Services.AddAuthentication().AddAutodesk(options =>
   {
       options.ClientId = builder.Configuration["AUTODESK_CLIENT_ID"] ?? throw new ArgumentException("'AUTODESK_CLIENT_ID' is undefined");
       options.ClientSecret = builder.Configuration["AUTODESK_CLIENT_SECRET"] ?? throw new ArgumentException("'AUTODESK_CLIENT_SECRET' is undefined");
       options.Scope.Add("data:read");
       options.CallbackPath = "/signin-autodesk";
       options.SaveTokens = true; // Save the access and refresh tokens that will accessible in the HttpContext 
   
   });
   
   var app = builder.Build();
   
   app.UseDefaultFiles();
   app.UseStaticFiles();
   
   // Configure the HTTP request pipeline.
   app.UseHttpsRedirection();
   
   app.UseAuthentication();
   app.UseAuthorization();
   
   app.MapControllers();
   
   app.MapFallbackToFile("/index.html");
   
   app.Run();
   
   

2. Create a controller, handling SignIn and SignOut. In your controller test.cs:

   [ApiController]
   [Route("api/[controller]")]
   public class Test() : ControllerBase
   {
       private HttpClient _client = new();
   
       [HttpGet("~/signin")]
       public IActionResult SignIn()
       {
           // Instruct the Autodesk authentication middleware to redirect the user agent to the Autodesk login page
           return Challenge(new AuthenticationProperties { RedirectUri = "/" }, AutodeskAuthenticationDefaults.AuthenticationScheme);
       }
   
       [HttpGet("~/signout")]
       public IActionResult SignOutCurrentUser()
       {
           // Instruct the cookies middleware to delete the local cookie created
           // when the user agent is redirected from the external identity provider
           // after a successful authentication flow.
           return SignOut(new AuthenticationProperties { RedirectUri = "/" },
               CookieAuthenticationDefaults.AuthenticationScheme);
       }
   
       [HttpGet("authToken")]
       [Authorize]
       //This endpoint is protected by the Autodesk authentication middleware and requires a valid access token (`Authorize` attribute)
       public async Task<IActionResult> GetTokenAsync()
       {
           // The middleware stores the access token in the HttpContext
           // Ensure that  `options.SaveTokens = true` is set in the `AddAutodesk`method in the `program.cs`file (see step 1)
           var accessToken = await HttpContext.GetTokenAsync(AutodeskAuthenticationDefaults.AuthenticationScheme, "access_token");
   
           if (string.IsNullOrEmpty(accessToken))
           {
               return Unauthorized("No access token available.");
           }
   
           return Ok(accessToken);
       }
   }
   
   

   The {root}/signin endpoint will redirect the user to the Autodesk login page. Once the user is authenticated, the user will be redirected to the {root}/ endpoint.

   Then you can use the {root}/api/test/authToken endpoint to get the access token.

Limitations

Get User info

The endpoint to get user info is only available in the Helper. Example:

var authClient = new AuthenticationClient();

var userInfo=authClient.Helper.GetUserInfoAsync("your three legged token");

Advanced

2 legged authentication

The code below shows how to get a 2-legged access token without using the Helper class.

var body = new TokenPostRequestBody()
{
    GrantType = Granttype.Client_credentials,
    Scope = "data:read data:write"
};

var authString = AuthenticationClientHelper.CreateAuthorizationString(APS_CLIENT_ID, APS_CLIENT_SECRET);

AuthToken authToken2 = await authClient.Authentication.V2.Token.PostAsync(body, r =>
{
    r.Headers.Add("Authorization", authString);
});