// 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;
 
namespace Microsoft.AspNetCore.Builder;
 
/// <summary>
/// The <see cref="IApplicationBuilder"/> extensions for adding CORS middleware support.
/// </summary>
public static class CorsMiddlewareExtensions
{
    /// <summary>
    /// Adds a CORS middleware to your web application pipeline to allow cross domain requests.
    /// </summary>
    /// <param name="app">The IApplicationBuilder passed to your Configure method</param>
    /// <returns>The original app parameter</returns>
    public static IApplicationBuilder UseCors(this IApplicationBuilder app)
    {
        ArgumentNullException.ThrowIfNull(app);
 
        return app.UseMiddleware<CorsMiddleware>();
    }
 
    /// <summary>
    /// Adds a CORS middleware to your web application pipeline to allow cross domain requests.
    /// </summary>
    /// <param name="app">The IApplicationBuilder passed to your Configure method</param>
    /// <param name="policyName">The policy name of a configured policy.</param>
    /// <returns>The original app parameter</returns>
    public static IApplicationBuilder UseCors(this IApplicationBuilder app, string policyName)
    {
        ArgumentNullException.ThrowIfNull(app);
 
        return app.UseMiddleware<CorsMiddleware>(policyName);
    }
 
    /// <summary>
    /// Adds a CORS middleware to your web application pipeline to allow cross domain requests.
    /// </summary>
    /// <param name="app">The IApplicationBuilder passed to your Configure method.</param>
    /// <param name="configurePolicy">A delegate which can use a policy builder to build a policy.</param>
    /// <returns>The original app parameter</returns>
    public static IApplicationBuilder UseCors(
        this IApplicationBuilder app,
        Action<CorsPolicyBuilder> configurePolicy)
    {
        ArgumentNullException.ThrowIfNull(app);
        ArgumentNullException.ThrowIfNull(configurePolicy);
 
        var policyBuilder = new CorsPolicyBuilder();
        configurePolicy(policyBuilder);
        return app.UseMiddleware<CorsMiddleware>(policyBuilder.Build());
    }
}