c# - How to get access token from HttpContext in .Net core 2.0

Question

I'm trying to upgrade a project from .Net core 1.1 to .Net core 2.0 there's a lot of breaking changes.

One of the things I'm currently having an issue with is that HttpContext.Authentication is now obsolete.

I've 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

.Net core 2.1 to access JWT bearer token

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