OpenID integration with WHMCS in C# & Blazor

[Bikbokken]

HI!

I've tried integrating WHMCS with my blazor project.

My Startup.cs is the following:

namespace ClientSite
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }
        public IConfiguration Configuration { get; }
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRazorPages();
            services.AddServerSideBlazor();
            services.AddSingleton<WeatherForecastService>();
            IdentityModelEventSource.ShowPII = true;
            services.AddAuthentication(options =>
            {
                options.DefaultScheme = "Cookies";
                options.DefaultChallengeScheme = "oidc";
            })
            .AddCookie("Cookies")
            .AddOpenIdConnect("oidc", options =>
            {
                options.Authority = "https://domain/oauth/openid-configuration.php";
                options.ClientId = "xxxxxxxxxxxx"; // 75 seconds
                options.ClientSecret = "xxxxxxxxxxxxxxxx";
                options.TokenValidationParameters = new TokenValidationParameters
                {
                    IssuerSigningKeyResolver = (token, securityToken, kid, parameters) =>
                    {
                        var client = new HttpClient();
                        var response = client.GetAsync("https://domain/oauth/certs.php").Result;
                        var responseString = response.Content.ReadAsStringAsync().Result;
                        var keys = JsonConvert.DeserializeObject<JwkListcs>(responseString);

                        return keys.Keys;
                    },
                    ValidIssuers = new List<string>
                    {
                        "https://domain/"
                    }
                };
                options.ResponseType = "code";
                options.SaveTokens = true;
                options.Configuration = new OpenIdConnectConfiguration
                {
                    AuthorizationEndpoint = "https://domain/oauth/authorize.php",
                    JwksUri = "https://domain/oauth/certs.php",
                    TokenEndpoint = "https://domain/oauth/token.php",
                    UserInfoEndpoint = "https://domain/oauth/userinfo.php",
                    Issuer = "https://domain",
                };
                options.GetClaimsFromUserInfoEndpoint = true;
                options.Events = new OpenIdConnectEvents
                {
                    OnAccessDenied = context =>
                    {
                        context.HandleResponse();
                        context.Response.Redirect("/");
                        return Task.CompletedTask;
                    }
                };
            });
            services.AddSingleton<BlazorServerAuthStateCache>();
            services.AddScoped<AuthenticationStateProvider, BlazorServerAuthState>();
        }
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseHsts();
            }
            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseAuthentication();
            app.UseRouting();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapBlazorHub();
                endpoints.MapFallbackToPage("/_Host");
            });
        }
    }
}

But after logging in and being redirected back to my page, i get this error. (attached image)

Does anyone know the solution to this problem?

 

Thanks in advance.

- Bikbokken. 

[Bikbokken]

I'm aware that it says i'm unauthorized, but i dont know where to give me authorisation besides the OpenID section on my WHMCS Admin site.