3cx_tapi/server/src/CPATapi.Client/ServiceExtensions.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Kiota.Abstractions.Authentication;
using Microsoft.Kiota.Http.HttpClientLibrary;

namespace CPATapi.Client;

public static class ServiceExtensions
{
    public static IServiceCollection AddCPATapiClient(this IServiceCollection services, Action<IServiceProvider, HttpClient> configureOptions)
    {
        services.AddKiotaHandlers();
        services.AddHttpClient<CPATapiClientFactory>((sp, client) =>
        {
            configureOptions.Invoke(sp, client);
        }).AttachKiotaHandlers();
        services.AddTransient(sp => sp.GetRequiredService<CPATapiClientFactory>().GetClient());
        return services;
    }

    private static IServiceCollection AddKiotaHandlers(this IServiceCollection services)
    {
        var handlers = KiotaClientFactory.GetDefaultHandlerActivatableTypes();
        foreach (var handler in handlers)
        {
            if (services.All(s => s.ServiceType != handler))
            {
                services.AddScoped(handler);
            }
        }
        return services;
    }

    private static IHttpClientBuilder AttachKiotaHandlers(this IHttpClientBuilder builder)
    {
        var handlers = KiotaClientFactory.GetDefaultHandlerActivatableTypes();
        foreach (var handler in handlers)
        {
            builder.AddHttpMessageHandler((sp) => (DelegatingHandler)sp.GetRequiredService(handler));
        }
        return builder;
    }
}

internal class CPATapiClientFactory(HttpClient httpClient)
{
    private readonly HttpClient _httpClient = httpClient;
    private readonly AnonymousAuthenticationProvider _authenticationProvider = new();

    public CPATapiClient GetClient()
    {
        return new CPATapiClient(new HttpClientRequestAdapter(_authenticationProvider, httpClient: _httpClient));
    }
}