【新增】增加获取用户真实ip地址中间件【RealIpMiddleware】，防止Nginx转发后只能获取服务器ip的问题。

CoreCms.Net.Middlewares/RealIpMiddleware.cs

@@ -0,0 +1,31 @@
+using Microsoft.AspNetCore.Http;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoreCms.Net.Middlewares
+{
+    /// <summary>
+    /// 获取真实ip地址
+    /// </summary>
+    public class RealIpMiddleware
+    {
+        private readonly RequestDelegate _next; public RealIpMiddleware(RequestDelegate next)
+        {
+            _next = next;
+        }
+        public Task Invoke(HttpContext context)
+        {
+            var headers = context.Request.Headers;
+            if (headers.ContainsKey("X-Forwarded-For"))
+            {
+                context.Connection.RemoteIpAddress = IPAddress.Parse(headers["X-Forwarded-For"].ToString().Split(',', StringSplitOptions.RemoveEmptyEntries)[0]);
+            }
+            return _next(context);
+        }
+    }
+
+}