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实现说明

1. 配置文件（appsettings.json）

   • 集中管理 Swagger 相关配置，包括允许访问的 IP 列表、文档标题和版本
   • 支持环境特定配置（如 appsettings.Development.json），方便多环境部署

2. SwaggerSettings 类

   • 强类型绑定配置文件中的 Swagger 节点
   • 提供类型安全的配置访问，避免硬编码字符串键

3. SwaggerIPFilterMiddleware 中间件

   • 自动拦截 Swagger 相关路径（/swagger 和 /swagger-ui）
   • 支持获取真实客户端 IP（包括反向代理场景）
   • 处理 IP 格式清洗（移除端口号，兼容 IPv4 和 IPv6）
   • 结合日志记录未授权访问尝试

4. Program.cs 配置

   • 启用配置文件热重载（reloadOnChange: true）
   • 通过 IOptions 模式注入配置，自动感知配置变化
   • 提供扩展方法简化中间件注册

使用方法

1. 修改 appsettings.json 中的 Swagger:AllowedIPs 添加允许访问的 IP
2. 无需重启应用，配置会自动生效
3. 非允许 IP 访问 Swagger 时会收到 403 禁止访问响应。

1、Program.cs

using SwaggerIpFilterDemo;var builder = WebApplication.CreateBuilder(args);// 配置：启用配置文件热重载
builder.Configuration.SetBasePath(builder.Environment.ContentRootPath).AddJsonFile("appsettings.json", reloadOnChange: true, optional: false).AddJsonFile($"appsettings.{builder.Environment.EnvironmentName}.json", reloadOnChange: true, optional: true).AddEnvironmentVariables();// 注册Swagger配置
builder.Services.Configure<SwaggerSettings>(builder.Configuration.GetSection("Swagger"));// 添加控制器服务
builder.Services.AddControllers();// 添加Swagger服务
builder.Services.AddSwaggerGen(c =>
{var swaggerSettings = builder.Configuration.GetSection("Swagger").Get<SwaggerSettings>();c.SwaggerDoc(swaggerSettings.Version, new() { Title = swaggerSettings.Title, Version = swaggerSettings.Version });
});var app = builder.Build();// 开发环境启用详细异常页
if (app.Environment.IsDevelopment())
{app.UseDeveloperExceptionPage();
}// 注册Swagger IP过滤中间件（必须在UseSwagger之前）
app.UseSwaggerIPFilter();// 启用Swagger
app.UseSwagger();
app.UseSwaggerUI(c =>
{var swaggerSettings = app.Services.GetRequiredService<IOptions<SwaggerSettings>>().Value;c.SwaggerEndpoint($"/swagger/{swaggerSettings.Version}/swagger.json", swaggerSettings.Title);
});// 其他中间件
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();app.MapControllers();app.Run();

2、SwaggerIPFilterMiddleware.cs

namespace SwaggerIpFilterDemo;/// <summary>
/// Swagger IP访问过滤中间件
/// </summary>
public class SwaggerIPFilterMiddleware
{private readonly RequestDelegate _next;private readonly IOptions<SwaggerSettings> _swaggerSettings;private readonly ILogger<SwaggerIPFilterMiddleware> _logger;/// <summary>/// 构造函数/// </summary>public SwaggerIPFilterMiddleware(RequestDelegate next,IOptions<SwaggerSettings> swaggerSettings,ILogger<SwaggerIPFilterMiddleware> logger){_next = next;_swaggerSettings = swaggerSettings;_logger = logger;}/// <summary>/// 中间件执行逻辑/// </summary>public async Task InvokeAsync(HttpContext context){// 只拦截Swagger相关请求if (context.Request.Path.StartsWithSegments("/swagger") || context.Request.Path.StartsWithSegments("/swagger-ui")){// 获取客户端真实IP（支持反向代理场景）var clientIp = GetClientIpAddress(context);// 处理IP格式（移除端口号）var cleanIp = CleanIpAddress(clientIp);// 检查是否为允许的IPvar allowedIps = _swaggerSettings.Value.AllowedIPs;var isAllowed = allowedIps.Contains(cleanIp) || cleanIp == "127.0.0.1" || cleanIp == "::1";if (!isAllowed){_logger.LogWarning("Swagger访问被拒绝，IP: {Ip}", cleanIp);context.Response.StatusCode = StatusCodes.Status403Forbidden;await context.Response.WriteAsync($"禁止访问Swagger文档，您的IP: {cleanIp}");return;}}// 允许访问，继续处理后续中间件await _next(context);}/// <summary>/// 获取客户端真实IP（支持反向代理）/// </summary>private string GetClientIpAddress(HttpContext context){// 优先从反向代理头获取（如Nginx/Apache设置的X-Forwarded-For）var forwardedFor = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();if (!string.IsNullOrEmpty(forwardedFor)){return forwardedFor.Split(',', StringSplitOptions.TrimEntries).First();}// 直接从连接获取IPreturn context.Connection.RemoteIpAddress?.ToString() ?? "未知IP";}/// <summary>/// 清理IP地址（移除端口号）/// </summary>private string CleanIpAddress(string ip){if (string.IsNullOrEmpty(ip)) return ip;// 处理带端口的IP（如 "192.168.1.100:5000" → "192.168.1.100"）if (ip.Contains(':')){// 区分IPv6（如"fe80::1:2:3:4:5"）和带端口的IPv4var parts = ip.Split(':');return parts.Length > 2 ? ip : parts[0];}return ip;}
}/// <summary>
/// 中间件扩展方法，简化注册
/// </summary>
public static class SwaggerIPFilterMiddlewareExtensions
{public static IApplicationBuilder UseSwaggerIPFilter(this IApplicationBuilder builder){return builder.UseMiddleware<SwaggerIPFilterMiddleware>();}
}

3、SwaggerSettings.cs

namespace SwaggerIpFilterDemo;/// <summary>
/// Swagger配置选项
/// </summary>
public class SwaggerSettings
{/// <summary>/// 允许访问Swagger的IP列表/// </summary>public List<string> AllowedIPs { get; set; } = new List<string>();/// <summary>/// 文档标题/// </summary>public string Title { get; set; } = "API文档";/// <summary>/// 文档版本/// </summary>public string Version { get; set; } = "v1";
}

4、appsettings.json

{"Logging": {"LogLevel": {"Default": "Information","Microsoft.AspNetCore": "Warning"}},"AllowedHosts": "*","Swagger": {"AllowedIPs": ["127.0.0.1",    // 本地IPv4"::1",          // 本地IPv6"192.168.1.100","192.168.1.101"],"Title": "API文档","Version": "v1"}
}