How to get access token from HttpContext in .Net c

Question

I am trying to upgrade a project from .Net core 1.1 to .Net core 2.0 there are a lot of breaking changes. One of the things i am currently having an issue with is that HttpContext.Authentication is now obsolete.

I have been trying to figure out how to get the Access token for the current request. I need to make a call to another API which requires a bearer token.

Old Method .Net core 1.1

[Authorize]
public async Task<IActionResult> ClientUpdate(ClientModel client)
{
    var accessToken = await HttpContext.Authentication.GetTokenAsync("access_token");

    return View();
}

Method .Net core 2.0

This is not working becouse context isnt registered.

[Authorize]
public async Task<IActionResult> ClientUpdate(ClientModel client)
{
    var accessToken = await context.HttpContext.GetTokenAsync("access_token"); 

    return View();
}

Unable to resolve service for type 'Microsoft.AspNetCore.Http.HttpContext'

I tried registering it but that doesnt work either

public ConsoleController(IOptions<ServiceSettings> serviceSettings, HttpContext context) 

In startup.cs

services.TryAddSingleton<HttpContext, HttpContext>();

Update:

This returns null

var accessToken = await HttpContext.GetTokenAsync("access_token");  

Startup.cs ConfigureServices

I wouldn't be surprised if it was something in the startup as there were a lot of breaking changes here as well.

services.Configure<ServiceSettings>(Configuration.GetSection("ServiceSettings"));
//services.TryAddSingleton<HttpContext, HttpContext>();
services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddMvc();
services.AddAuthentication(options =>
            {

                options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
            })
            .AddCookie()
            .AddOpenIdConnect(options =>
            {
                options.Authority = "http://localhost:5000";
                options.ClientId = "testclient";
                options.ClientSecret = "secret";
                options.ResponseType = "code id_token";
                options.RequireHttpsMetadata = false;
                options.GetClaimsFromUserInfoEndpoint = true;
            });

Startup.cs Configure

loggerFactory.AddDebug();

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseBrowserLink();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
        }

        JwtSecurityTokenHandler.DefaultInboundClaimTypeMap.Clear();

        app.UseStaticFiles();
        app.UseAuthentication();

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        });

Answer 1

Startup.cs

 public void ConfigureServices(IServiceCollection services)
    {
    ...
     services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
     ...
    }

Controller.cs constructor

private IHttpContextAccessor _httpContextAccessor;
public ClientController(IHttpContextAccessor httpContextAccessor)
{
     _httpContextAccessor = httpContextAccessor;
}



    [Authorize]
public async Task<IActionResult> ClientUpdate(ClientModel client)
{
    var accessToken = await _httpContextAccessor.HttpContext.GetTokenAsync("access_token"); 

    return View();
}

This should work

Answer 2

You need to specify the external schema to retrieve the token.

var accessToken = await HttpContext.GetTokenAsync(IdentityConstants.ExternalScheme, "access_token");

Answer 3

Real thanks, this is perfect !

I had this work, but with our azure tenant dedicated authority. Simply replace ****** with your tenant name.

options.Authority = "https://login.microsoftonline.com/******.onmicrosoft.com";

You also can use tenant id. Simply insert your tenant id after https://login.microsoftonline.com/

options.Authority = "https://login.microsoftonline.com/be0be093-****-****-****-5626e83beefc";

Answer 4

A little change from Azharuddin answer

Register the service instance in Startup method like

public void ConfigureServices(IServiceCollection services)
{

 services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
 ...
}

And inject the dependency in your controller like

private IHttpContextAccessor _httpContextAccessor;
public ClientController(IHttpContextAccessor httpContextAccessor)
{
     _httpContextAccessor = httpContextAccessor;
}

And retrieve the access token in your action like

[Authorize]
public async Task<IActionResult> ClientUpdate(ClientModel client)
{
    var accessToken = _httpContextAccessor.HttpContext.Request.Headers["Authorization"];

    ..........//Some other code
    return View();
}

Answer 5

It ended up being a configuration issue. There needs to be a link between AddAuthentication and AddOpenIdConnect in order for it to read the cookie into the headers.

services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();

services.AddAuthentication(options =>
            {
                options.DefaultScheme = "Cookies";
                options.DefaultChallengeScheme = "oidc";
            })
            .AddCookie("Cookies")
            .AddOpenIdConnect("oidc", options =>
            {
                options.SignInScheme = "Cookies";

                options.Authority = "http://localhost:5000";
                options.RequireHttpsMetadata = false;

                options.ClientId = "testclient";
                options.ClientSecret = "secret";
                options.ResponseType = "code id_token";
                options.SaveTokens = true;
                options.GetClaimsFromUserInfoEndpoint = true;

                options.Scope.Add("testapi");
                options.Scope.Add("offline_access");
            });

Controller

    [Authorize]
    public async Task<IActionResult> Index()
    {
        var accessToken = await HttpContext.GetTokenAsync("access_token");
        return View();
    }

Access token is now populated.

Note: I ended up digging it out of this project Startup.cs

Answer 6

.Net core 2.1 to access JWT bearer token

var accessToken = Request.Headers["Authorization"];