Automatically Attaching Identity Cookie to HTTP Client in Blazor wasm - asp.net

Question

I am working on a blazor application where I used my API project as Identity
Provider. Everything is working fine but the issue is that the access token
issued by my API is not validated by the API. It turns out the API is expecting a
cookie header. I took a closer look at blazor hosted application and found out
the cookie is being sent along with each request but it's same-origin.
My Blazor WASM project does not automatically attach this cookie in the request
header, just the access token.
Is there a way I can make the Http handler attach this cookie on each request?
or make the API validate the access token instead of the identity cookie.
This is my startup class in the API Project
public static void AddIdentityServer(IServiceCollection services,IConfiguration configuration)
{
services.AddIdentityServer(options =>
{
options.UserInteraction.LoginUrl = "/Identity/Account/Login";
options.UserInteraction.LogoutUrl = "/Identity/Account/Logout";
}).AddProfileService<LocalProfileService>()
.AddApiAuthorization<ApplicationUser, ApplicationDbContext>(option =>
{
option.Clients.Add(new Client
{
ClientId = "blazor",
AllowedGrantTypes = GrantTypes.Code,
RequirePkce = true,
RequireClientSecret = false,
AllowedCorsOrigins = { "https://localhost:5001" },
AllowedScopes = { "openid", "profile", "email","id" },
RedirectUris = { "https://localhost:5001/authentication/login-callback" },
PostLogoutRedirectUris = { "https://localhost:5001/" },
Enabled = true,
RequireConsent = false,
});
option.IdentityResources.AddEmail();
option.IdentityResources["openid"].UserClaims.Add("name");
option.ApiResources.Single().UserClaims.Add("name");
option.IdentityResources["openid"].UserClaims.Add("role");
option.ApiResources.Single().UserClaims.Add("role");
option.IdentityResources.Add(new IdentityResource("id",new string[] {"id" }));
option.ApiResources.Single().UserClaims.Add("id");
});
services.AddAuthentication()
.AddGoogle("Google", options =>
{
options.ClientId = configuration["ExternalLoginApiKey:GoogleClientId"];
options.ClientSecret = configuration["ExternalLoginApiKey:GoogleClientSecret"];
})
.AddFacebook("Facebook", options =>
{
options.AppId = configuration["ExternalLoginApiKey:FacebookAppId"];
options.AppSecret = configuration["ExternalLoginApiKey:FacebookAppSecret"];
})
.AddIdentityServerJwt();
}
Program class in the Blazor Project
public static async Task Main(string[] args)
{
var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("app");
builder.Services.AddOidcAuthentication(options =>
{
builder.Configuration.Bind("oidc", options.ProviderOptions);
options.UserOptions.RoleClaim = "role";
}).AddAccountClaimsPrincipalFactory<CustomUserFactory>();
builder.Services.AddHttpClient<IAuthorizedRestService, AuthorizedRestService>(
client => client.BaseAddress = new Uri("https://localhost:5002/api/mart/v1/"))
.AddHttpMessageHandler(sp => sp.GetRequiredService<AuthorizationMessageHandler>()
.ConfigureHandler(authorizedUrls: new[] { "https://localhost:5002" }));
builder.Services.AddHttpClient("noauth", option => option.BaseAddress = new
Uri("https://localhost:5002/api/mart/v1/"));
builder.Services.AddScoped<IRestService, RestService>();
await builder.Build().RunAsync();
}

Answer 1

I have found the Solution.
It happens that there is already a JWT handler provided by IdentityServer4 for APIs that double as Authorization Server
.AddIdentityServerJwt();
So what I did was to configure it
services.Configure<JwtBearerOptions>
(IdentityServerJwtConstants.IdentityServerJwtBearerScheme,
options =>
{
options.Authority = "https://localhost:5002";
options.Audience = "mart";
options.SaveToken = true;
});
Then specify the Authentication scheme to use
[Authorize(AuthenticationSchemes = IdentityServerJwtConstants.IdentityServerJwtBearerScheme)]
You can also add it globally in the start up class
var authorizationPolicy = new AuthorizationPolicyBuilder(IdentityServerJwtConstants.IdentityServerJwtBearerScheme)
.RequireAuthenticatedUser().Build();
options.Filters.Add(new AuthorizeFilter(authorizationPolicy));
You can read more using these links
https://learn.microsoft.com/en-us/aspnet/core/security/authorization/limitingidentitybyscheme?view=aspnetcore-3.1
https://learn.microsoft.com/en-us/aspnet/core/security/authentication/identity-api-authorization?view=aspnetcore-3.1