在Owin启动类中指定域

Question

我创建了一个自托管Owin/SignalR应用程序,代码类似于本教程中的代码:

SignalR Self Host Tutorial

一切正常,但出于安全考虑,我想将其限制为仅允许来自特定远程站点的消息.换句话说,我想替换"app.UseCors(CorsOptions.AllowAll);" 使用代码来限制应用程序仅响应来自我定义的URL的消息,即仅允许来自http://www.remote_site.com等的消息.有没有简单的方法来做到这一点？

作为参考,这是我的SignalR启动类的代码:

using System;
using Microsoft.AspNet.SignalR;
using Microsoft.Owin.Hosting;
using Owin;
using Microsoft.Owin.Cors;

namespace SignalRSelfHost
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.UseCors(CorsOptions.AllowAll);
            app.MapSignalR();

        // How do I only allow a specific URL instead of the "CorsOptions.AllowAll" option?             
        }
    }
}

Answer 1

以下是Owin Startup该类的完整实现:

using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;
using Microsoft.Owin.Cors;
using System.Web.Cors;

[assembly: OwinStartup(typeof(SignalRSelfHost.Startup))]

namespace SignalRSelfHost
{
    public class Startup
    {

        public void Configuration(IAppBuilder app)
        {
            var policy = new CorsPolicy()
            {
                AllowAnyHeader = true,
                AllowAnyMethod = true,
                SupportsCredentials = true
            };

            policy.Origins.Add("domain"); //be sure to include the port:
//example: "http://localhost:8081"

            app.UseCors(new CorsOptions
            {
                PolicyProvider = new CorsPolicyProvider
                {
                    PolicyResolver = context => Task.FromResult(policy)
                }
            });

            app.MapSignalR();
        }
    }
}

此外,如果您希望服务器接受域列表,只需将它们添加到Origins.

希望这可以帮助!祝好运!

Answer 2

这是我在上面的评论中提到的代码:

public class Startup
{

    public void Configuration(IAppBuilder app)
    {
        app.UseCors(_corsOptions.Value);
        app.MapSignalR(); 
    }


    private static Lazy<CorsOptions> _corsOptions = new Lazy<CorsOptions>(() =>
    {
        return new CorsOptions
        {
            PolicyProvider = new CorsPolicyProvider
            {
                PolicyResolver = context =>
                {
                    var policy = new CorsPolicy();
                    policy.Origins.Add("http://localhost:8081");
                    policy.AllowAnyMethod = true;
                    policy.AllowAnyHeader = true;
                    policy.SupportsCredentials = true;
                    return Task.FromResult(policy);
                }
            }
        };
    });

}

这有效,但我认为Matei上面的答案更简洁.