improve remote addr parsing as requested at: https://github.com/kataras/iris/issues/1453

Former-commit-id: e5fde988eda9bf582b04285a1c77ba123910a699

core/netutil/ip_test.go

@@ -0,0 +1,62 @@
+package netutil
+
+import (
+	"net"
+	"testing"
+)
+
+func TestIP(t *testing.T) {
+	privateRanges := []IPRange{
+		{
+			Start: net.ParseIP("10.0.0.0"),
+			End:   net.ParseIP("10.255.255.255"),
+		},
+		{
+			Start: net.ParseIP("100.64.0.0"),
+			End:   net.ParseIP("100.127.255.255"),
+		},
+		{
+			Start: net.ParseIP("172.16.0.0"),
+			End:   net.ParseIP("172.31.255.255"),
+		},
+		{
+			Start: net.ParseIP("192.0.0.0"),
+			End:   net.ParseIP("192.0.0.255"),
+		},
+		{
+			Start: net.ParseIP("192.168.0.0"),
+			End:   net.ParseIP("192.168.255.255"),
+		},
+		{
+			Start: net.ParseIP("198.18.0.0"),
+			End:   net.ParseIP("198.19.255.255"),
+		},
+	}
+
+	addresses := []string{
+		"201.37.138.59",
+		"159.117.3.153",
+		"166.192.97.84",
+		"225.181.213.210",
+		"124.50.84.134",
+		"87.53.250.102",
+		"106.79.33.62",
+		"242.120.17.144",
+		"131.179.101.254",
+		"103.11.11.174",
+		"115.97.0.114",
+		"219.202.120.251",
+		"37.72.123.120",
+		"154.94.78.101",
+		"126.105.144.250",
+	}
+
+	got, ok := GetIPAddress(addresses, privateRanges)
+	if !ok {
+		t.Logf("expected addr to be matched")
+	}
+
+	if expected := "126.105.144.250"; expected != got {
+		t.Logf("expected addr to be found: %s but got: %s", expected, got)
+	}
+}