dpot-backend/Web.Api/Extensions/HttpContextExtension.cs

using System.Security.Claims;

namespace Library.Extensions
{
    public static class HttpContextExtension
    {
        // 회원 ID 조회
        public static int GetMemberID(this HttpContext context)
        {
            return int.TryParse(context.User.FindFirst(ClaimTypes.NameIdentifier)?.Value, out var id) ? id : 0;
        }

        // 회원 이름 조회
        public static string? UserName(this HttpContext context) => context.User.Identity?.Name;

        // 이전 요청 URL 조회
        public static string? GetReferer(this HttpContext context)
        {
            if (context.Request.Headers.TryGetValue("Referer", out var referer) && !string.IsNullOrWhiteSpace(referer))
            {
                return referer.ToString();
            }

            return null;
        }

        // Client IP 조회
        public static string? GetClientIP(this HttpContext context)
        {
            var forwardedFor = context.Request.Headers["X-Forwarded-For"].FirstOrDefault();
            if (!string.IsNullOrWhiteSpace(forwardedFor))
            {
                return forwardedFor;
            }

            return context.Connection.RemoteIpAddress?.ToString();
        }

        // User-agent 조회
        public static string? GetUserAgent(this HttpContext context)
        {
            if (context.Request.Headers.TryGetValue("User-Agent", out var userAgent) && !string.IsNullOrWhiteSpace(userAgent))
            {
                return userAgent.ToString();
            }

            return null;
        }

        // 상관관계 ID 조회
        public static string GetCorrelationID(this HttpContext context) => context.TraceIdentifier;
    }
}