IdentityServer4 Custom Token Request Validator Not Called

Question

I am using IdentityServer4 in my project with ASP.NET Identity. My goal is to add logic that will assign dynamic token expiration. I am following this topic from the IdSrv4 documentation about ICustomTokenRequestValidator .

My initial validator is very basic.

public class TokenLifetimeValidator : ICustomTokenRequestValidator
{
    public Task ValidateAsync(CustomTokenRequestValidationContext context)
    {
        throw new NotImplementedException();
    }
}

This is the IdSrv4 configuration:

services.AddIdentityServer()
    .AddAspNetIdentity<ApplicationUser>()
    .AddInMemoryIdentityResources(new IdentityResource[] { new IdentityResources.OpenId(), new IdentityResources.Profile() })
    .AddInMemoryApiResources(new ApiResource[] { new ApiResource("api", new[] { JwtClaimTypes.Name, JwtClaimTypes.Role }) })
    .AddInMemoryClients(new Client[]
    {
        new Client
        {
            ClientId = "client",
            AllowedGrantTypes = GrantTypes.Implicit,
            AllowedScopes =
            {
                IdentityServerConstants.StandardScopes.OpenId,
                IdentityServerConstants.StandardScopes.Profile,
                "api"
            },
            AllowAccessTokensViaBrowser = true,
            RequireConsent = false,
            RedirectUris = Configuration.GetSection("RedirectUris").Get<string[]>(),
            PostLogoutRedirectUris = Configuration.GetSection("PostLogoutRedirectUris").Get<string[]>(),
            AccessTokenLifetime = 60*60*24, // 24 Hours
            IdentityTokenLifetime = 60*60*24 // 24 Hours
        }
    })
    // Not working.
    ---> //.AddCustomTokenRequestValidator<TokenLifetimeValidator>()
    .AddDeveloperSigningCredential();

// Not working.
---> services.AddTransient<ICustomTokenRequestValidator, TokenLifetimeValidator>();

Regardles of how I register the custom validator, it never gets executed. I tested with IdentityServer4 2.0.0, 2.1.0, 2.3.2, 2.4.0.

How can I get the validator to get executed?

Thanks!

Edit: The login is executed by oidc-client.js and its userManager.signinRedirect .

this.userManager = new UserManager({
  authority: environment.issuer,
  client_id: 'client',
  scope: 'openid profile api',
  response_type: 'id_token token',
  loadUserInfo: true,
  automaticSilentRenew: true,
  redirect_uri: environment.app + '/login-callback.html',
  silent_redirect_uri: environment.app + '/silent-renew.html',
  post_logout_redirect_uri: environment.app
});

Answer 1

It turned out that the appropriate interface to implement for my flow was ICustomAuthorizeRequestValidator .

• connect/authorize - ICustomAuthorizeRequestValidator
• connect/token - ICustomTokenRequestValidator

Thanks to Vidmantas Blazevicius and d_f for the pointers.