HttpContextExtensions.cs
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using System.Text;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Http;
namespace Yi.Framework.Core.Extensions
{
/// <summary>
/// HttpContext扩展方法类
/// </summary>
public static class HttpContextExtensions
{
/// <summary>
/// 设置内联文件下载响应头
/// </summary>
/// <param name="httpContext">HTTP上下文</param>
/// <param name="fileName">文件名</param>
public static void FileInlineHandle(this HttpContext httpContext, string fileName)
{
var encodeFilename = System.Web.HttpUtility.UrlEncode(fileName, Encoding.UTF8);
httpContext.Response.Headers.Add("Content-Disposition", $"inline;filename={encodeFilename}");
}
/// <summary>
/// 设置附件下载响应头
/// </summary>
/// <param name="httpContext">HTTP上下文</param>
/// <param name="fileName">文件名</param>
public static void FileAttachmentHandle(this HttpContext httpContext, string fileName)
{
var encodeFilename = System.Web.HttpUtility.UrlEncode(fileName, Encoding.UTF8);
httpContext.Response.Headers.Add("Content-Disposition", $"attachment;filename={encodeFilename}");
}
/// <summary>
/// 获取客户端首选语言
/// </summary>
/// <param name="httpContext">HTTP上下文</param>
/// <returns>语言代码,默认返回zh-CN</returns>
public static string GetLanguage(this HttpContext httpContext)
{
const string defaultLanguage = "zh-CN";
var acceptLanguage = httpContext.Request.Headers["Accept-Language"].FirstOrDefault();
return string.IsNullOrEmpty(acceptLanguage)
? defaultLanguage
: acceptLanguage.Split(',')[0];
}
/// <summary>
/// 判断是否为Ajax请求
/// </summary>
/// <param name="request">HTTP请求</param>
/// <returns>是否为Ajax请求</returns>
public static bool IsAjaxRequest(this HttpRequest request)
{
const string ajaxHeader = "XMLHttpRequest";
return ajaxHeader.Equals(request.Headers["X-Requested-With"],
StringComparison.OrdinalIgnoreCase);
}
/// <summary>
/// 获取客户端IP地址
/// </summary>
/// <param name="context">HTTP上下文</param>
/// <returns>客户端IP地址</returns>
public static string GetClientIp(this HttpContext context)
{
const string localhost = "127.0.0.1";
if (context == null) return string.Empty;
// 尝试获取X-Forwarded-For头
var ip = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();
// 如果没有代理头,则获取远程IP
if (string.IsNullOrEmpty(ip))
{
ip = context.Connection.RemoteIpAddress?.ToString();
}
// 处理特殊IP
if (string.IsNullOrEmpty(ip) || ip.Contains("::1"))
{
return localhost;
}
// 清理IPv6格式
ip = ip.Replace("::ffff:", localhost);
// 移除端口号
ip = Regex.Replace(ip, @":\d{1,5}$", "");
// 验证IP格式
var isValidIp = Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$") ||
Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?):\d{1,5}$");
return isValidIp ? ip : localhost;
}
/// <summary>
/// 获取User-Agent信息
/// </summary>
/// <param name="context">HTTP上下文</param>
/// <returns>User-Agent字符串</returns>
public static string GetUserAgent(this HttpContext context)
{
return context.Request.Headers["User-Agent"].ToString();
}
/// <summary>
/// 获取用户权限声明值
/// </summary>
/// <param name="context">HTTP上下文</param>
/// <param name="permissionsName">权限声明名称</param>
/// <returns>权限值数组</returns>
public static string[]? GetUserPermissions(this HttpContext context, string permissionsName)
{
return context.User.Claims
.Where(x => x.Type == permissionsName)
.Select(x => x.Value)
.ToArray();
}
/// <summary>
/// 判断是否为WebSocket请求
/// </summary>
/// <param name="context">HTTP上下文</param>
/// <returns>是否为WebSocket请求</returns>
public static bool IsWebSocketRequest(this HttpContext context)
{
return context.WebSockets.IsWebSocketRequest ||
context.Request.Path == "/ws";
}
}
}