Oauth2 login to Google api with ASP .net core MVC

Question

I have been following Web applications (ASP.NET MVC) Attempting to connect to one of the Google APIs.

using System;
using System.Web.Mvc;

using Google.Apis         


        

Answer 1

The problem is that the above sample was not designed for .net core.

clientinfo.cs

/// <summary>
    /// Client auth information, loaded from a Google user credential json file.
    /// Set the TEST_CLIENT_SECRET_FILENAME environment variable to point to the credential file.
    /// </summary>
    public class ClientInfo
    {
        public static ClientInfo Load()
        {
            const string ClientSecretFilenameVariable = "TEST_CLIENT_SECRET_FILENAME";
            string clientSecretFilename = Environment.GetEnvironmentVariable(ClientSecretFilenameVariable);
            if (string.IsNullOrEmpty(clientSecretFilename))
            {
                throw new InvalidOperationException($"Please set the {ClientSecretFilenameVariable} environment variable before running tests.");
            }
            var secrets = JObject.Parse(Encoding.UTF8.GetString(File.ReadAllBytes(clientSecretFilename)))["web"];
            var projectId = secrets["project_id"].Value<string>();
            var clientId = secrets["client_id"].Value<string>();
            var clientSecret = secrets["client_secret"].Value<string>();
            return new ClientInfo(projectId, clientId, clientSecret);
        }

        private ClientInfo()
        {
            Load();
        }


        private ClientInfo(string projectId, string clientId, string clientSecret)
        {
            ProjectId = projectId;
            ClientId = clientId;
            ClientSecret = clientSecret;
        }

        public string ProjectId { get; }
        public string ClientId { get; }
        public string ClientSecret { get; }
    }

Program.cs

 public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args)
        {
            var clientInfo = ClientInfo.Load();

            return WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .ConfigureServices(services =>
                {
                    services.AddSingleton(clientInfo);
                })
                .Build();
        }
    }

startup.cs configure services

 services.AddAuthentication(options =>
                {
                    options.DefaultScheme = "Cookies";
                    options.DefaultChallengeScheme = "Google";
                })
                .AddCookie("Cookies")
                .AddGoogleOpenIdConnect("Google", options =>
                {
                    var clientInfo = (ClientInfo)services.First(x => x.ServiceType == typeof(ClientInfo)).ImplementationInstance;
                    options.ClientId = clientInfo.ClientId;
                    options.ClientSecret = clientInfo.ClientSecret;
                    options.Scope.Add("profile");   

                });

        }

add the following to configure as well app.UseAuthentication();

controler

[GoogleScopedAuthorize("https://www.googleapis.com/auth/analytics.readonly")]
        public async Task<IActionResult> GoogleAnalyticsReport([FromServices] IGoogleAuthProvider auth, [FromServices] ClientInfo clientInfo, long ViewId)
        {
            var cred = await auth.GetCredentialAsync();
            var service = new AnalyticsReportingService(new BaseClientService.Initializer
            {
                HttpClientInitializer = cred
            });

LogOut

 public async Task<IActionResult> Logout()
    {
        await HttpContext.SignOutAsync();
        return RedirectToAction("Index");
    }

Its now logging my user in and i can request data.