add LAN ip to LocalRequestsOnlyAuthorizationFilter

src/DotNetCore.CAP/Dashboard/LocalRequestsOnlyAuthorizationFilter.cs

-namespace DotNetCore.CAP.Dashboard
+using DotNetCore.CAP.Infrastructure;
+
+namespace DotNetCore.CAP.Dashboard
 {
     public class LocalRequestsOnlyAuthorizationFilter : IDashboardAuthorizationFilter
     {
@@ -16,6 +18,10 @@
             if (context.Request.RemoteIpAddress == context.Request.LocalIpAddress)
                 return true;
 
+            // check if private ip
+            if (Helper.IsInnerIP(context.Request.RemoteIpAddress))
+                return true;
+
             return false;
         }
     }

src/DotNetCore.CAP/Infrastructure/Helper.cs

@@ -105,6 +105,43 @@ namespace DotNetCore.CAP.Infrastructure
             return AddJsonProperty(json, "ExceptionMessage", jObject);
         }
 
+        public static bool IsInnerIP(string ipAddress)
+        {
+            bool isInnerIp;
+            var ipNum = GetIpNum(ipAddress);
+
+            //Private IP：
+            //category A: 10.0.0.0-10.255.255.255
+            //category B: 172.16.0.0-172.31.255.255
+            //category C: 192.168.0.0-192.168.255.255  
+
+            var aBegin = GetIpNum("10.0.0.0");
+            var aEnd = GetIpNum("10.255.255.255");
+            var bBegin = GetIpNum("172.16.0.0");
+            var bEnd = GetIpNum("172.31.255.255");
+            var cBegin = GetIpNum("192.168.0.0");
+            var cEnd = GetIpNum("192.168.255.255");
+            isInnerIp = IsInner(ipNum, aBegin, aEnd) || IsInner(ipNum, bBegin, bEnd) || IsInner(ipNum, cBegin, cEnd);
+            return isInnerIp;
+        }
+
+        private static long GetIpNum(string ipAddress)
+        {
+            var ip = ipAddress.Split('.');
+            long a = int.Parse(ip[0]);
+            long b = int.Parse(ip[1]);
+            long c = int.Parse(ip[2]);
+            long d = int.Parse(ip[3]);
+
+            var ipNum = a * 256 * 256 * 256 + b * 256 * 256 + c * 256 + d;
+            return ipNum;
+        }
+         
+        private static bool IsInner(long userIp, long begin, long end)
+        {
+            return userIp >= begin && userIp <= end;
+        }
+
         private static bool CanConvertFromString(Type destinationType)
         {
             destinationType = Nullable.GetUnderlyingType(destinationType) ?? destinationType;