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ServiceStack and FacebookAuthProvider

I work with ServiceStack and Auth providers. In particular, "FacebookAuthProvider". My problem here is that the service is being called from an iOS application. This application already has a valid access token, and I just want to pass this value to facebook authentication.

I saw the tests on the github servicestack page, but it still makes no sense to me.

Is it possible to transfer this access token to the service program, so authentication skips the part where I request permission, since we already did this in the application?

Or am I doing it wrong?

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auth facebook CustomFacebookAuthProvider. , facebook , . .

, FacebookAuthProvider.cs .

using System;
using System.Collections.Generic;
using System.Net;
using Elmah;
using Mondohunter.Backend.BusinessLogic.Interfaces;
using ServiceStack.Common.Extensions;
using ServiceStack.Common.Web;
using ServiceStack.Configuration;
using ServiceStack.ServiceInterface;
using ServiceStack.ServiceInterface.Auth;
using ServiceStack.Text;
using ServiceStack.WebHost.Endpoints;

namespace Mondohunter.Interfaces
{
    public class CustomFacebookAuthProvider : OAuthProvider
    {
        public const string Name = "facebook";
        public static string Realm = "https://graph.facebook.com/";
        public static string PreAuthUrl = "https://www.facebook.com/dialog/oauth";

        public string AppId { get; set; }
        public string AppSecret { get; set; }
        public string[] Permissions { get; set; }

        public CustomFacebookAuthProvider(IResourceManager appSettings)
            : base(appSettings, Realm, Name, "AppId", "AppSecret")
        {
            this.AppId = appSettings.GetString("oauth.facebook.AppId");
            this.AppSecret = appSettings.GetString("oauth.facebook.AppSecret");
        }

        public override object Authenticate(IServiceBase authService, IAuthSession session, Auth request)
        {
            var tokens = Init(authService, ref session, request);

            try
            {
                if (request.oauth_token.IsNullOrEmpty())
                    throw new Exception();

                tokens.AccessToken = request.oauth_token;
                session.IsAuthenticated = true;

                var json = AuthHttpGateway.DownloadFacebookUserInfo(request.oauth_token);
                var authInfo = JsonSerializer.DeserializeFromString<Dictionary<string, string>>(json);

                //Here i need to update/set userauth id to the email
                //UpdateUserAuthId(session, authInfo["email"]);

                authService.SaveSession(session, SessionExpiry);
                OnAuthenticated(authService, session, tokens, authInfo);

                //return json/xml/... response;
            }
            catch (WebException ex)
            {
                //return json/xml/... response;
            }
            catch (Exception ex)
            {
                //return json/xml/... response;
            }
        }

        protected override void LoadUserAuthInfo(AuthUserSession userSession, IOAuthTokens tokens, Dictionary<string, string> authInfo)
        {
            if (authInfo.ContainsKey("id"))
                tokens.UserId = authInfo.GetValueOrDefault("id");
            if (authInfo.ContainsKey("name"))
                tokens.DisplayName = authInfo.GetValueOrDefault("name");
            if (authInfo.ContainsKey("first_name"))
                tokens.FirstName = authInfo.GetValueOrDefault("first_name");
            if (authInfo.ContainsKey("last_name"))
                tokens.LastName = authInfo.GetValueOrDefault("last_name");
            if (authInfo.ContainsKey("email"))
                tokens.Email = authInfo.GetValueOrDefault("email");
            if (authInfo.ContainsKey("gender"))
                tokens.Gender = authInfo.GetValueOrDefault("gender");
            if (authInfo.ContainsKey("timezone"))
                tokens.TimeZone = authInfo.GetValueOrDefault("timezone");

            LoadUserOAuthProvider(userSession, tokens);
        }

        public override void LoadUserOAuthProvider(IAuthSession authSession, IOAuthTokens tokens)
        {
            var userSession = authSession as CustomUserSession;
            if (userSession == null) return;

            userSession.Email = tokens.Email ?? userSession.PrimaryEmail ?? userSession.Email;
        }
    }
}

, .

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