// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.Cors.Infrastructure;
using Microsoft.Extensions.DependencyInjection.Extensions;
 
namespace Microsoft.Extensions.DependencyInjection;
 
/// <summary>
/// Extension methods for setting up cross-origin resource sharing services in an <see cref="IServiceCollection" />.
/// </summary>
public static class CorsServiceCollectionExtensions
{
    /// <summary>
    /// Adds cross-origin resource sharing services to the specified <see cref="IServiceCollection" />.
    /// </summary>
    /// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
    /// <returns>The <see cref="IServiceCollection"/> so that additional calls can be chained.</returns>
    public static IServiceCollection AddCors(this IServiceCollection services)
    {
        ArgumentNullException.ThrowIfNull(services);
 
        services.AddOptions();
 
        services.TryAdd(ServiceDescriptor.Transient<ICorsService, CorsService>());
        services.TryAdd(ServiceDescriptor.Transient<ICorsPolicyProvider, DefaultCorsPolicyProvider>());
 
        return services;
    }
 
    /// <summary>
    /// Adds cross-origin resource sharing services to the specified <see cref="IServiceCollection" />.
    /// </summary>
    /// <param name="services">The <see cref="IServiceCollection" /> to add services to.</param>
    /// <param name="setupAction">An <see cref="Action{CorsOptions}"/> to configure the provided <see cref="CorsOptions"/>.</param>
    /// <returns>The <see cref="IServiceCollection"/> so that additional calls can be chained.</returns>
    public static IServiceCollection AddCors(this IServiceCollection services, Action<CorsOptions> setupAction)
    {
        ArgumentNullException.ThrowIfNull(services);
        ArgumentNullException.ThrowIfNull(setupAction);
 
        services.AddCors();
        services.Configure(setupAction);
 
        return services;
    }
}