Access token for API controller inside Identity server itself

I have created an identity server 4 project and a mvc client project. Authentication flow works as expected. I have added an API controller in the same project as identity server and i want to hit this api resource from mvc client.Essentially,i need both identity server middleware and token validation middle inside the idenity server project.

If you haven't already, add these Nuget packages to your already established IdentityServer app/site:

IdentityServer4.AccessTokenValidation
Microsoft.AspNetCore.Mvc

Add another Api Resource to your resources list:

public static IEnumerable<ApiResource> GetApiResources()
{
    return new List<ApiResource>
    {
        new ApiResource("api1", "My API"), 
        new ApiResource("api2", "IdentityServer API")
    };
}

Update your client configuration to allow api2:

public static IEnumerable<Client> GetClients()
{
    return new List<Client>
    {
        new Client
        {
            ClientId = "mvc",

            ... omitted

            AllowedScopes = new List<string>
            {
                IdentityServerConstants.StandardScopes.OpenId,
                IdentityServerConstants.StandardScopes.Profile,
                "api2"
            }
        }
    };
}

In the IdentityServer's Configure method in Startup add:

app.UseIdentityServerAuthentication(new IdentityServerAuthenticationOptions
{
    Authority = "http://localhost:5000",
    RequireHttpsMetadata = false,

    ApiName = "api2"
});