在Asp.Net Core中使用IP范围进行CORS配置,可以使用自定义中间件来实现。以下是一个示例代码:
首先创建一个名为CorsMiddleware
的自定义中间件类:
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using System;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
public class CorsMiddleware
{
private readonly RequestDelegate _next;
private readonly IConfiguration _configuration;
private readonly ILogger _logger;
public CorsMiddleware(RequestDelegate next, IConfiguration configuration, ILogger logger)
{
_next = next;
_configuration = configuration;
_logger = logger;
}
public async Task Invoke(HttpContext context)
{
var allowedIPRanges = _configuration.GetSection("AllowedIPRanges").Get();
var clientIpAddress = context.Connection.RemoteIpAddress;
if (clientIpAddress != null)
{
var isAllowed = allowedIPRanges.Any(ipRange => IPAddressRange.Parse(ipRange).Contains(clientIpAddress));
if (!isAllowed)
{
_logger.LogWarning($"Request from IP address {clientIpAddress} blocked by CORS policy.");
context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
return;
}
}
await _next(context);
}
}
然后,在Startup.cs
文件的Configure
方法中添加中间件:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
{
// ...
app.UseMiddleware();
// ...
}
接下来,在appsettings.json文件中添加一个名为AllowedIPRanges
的配置项,配置允许的IP范围:
{
"AllowedIPRanges": [
"192.168.0.0/24",
"10.0.0.0/8"
]
}
这样,CORS中间件将会根据配置的IP范围来允许或拒绝请求。如果请求的IP地址不在允许的范围内,将返回HTTP状态码403 Forbidden。
请注意,为了使此示例代码正常工作,您需要添加Microsoft.Extensions.Configuration
和Microsoft.Extensions.Logging
包的引用。