chore: sync local updates

mengyaping-backend/utils/intranet.go

@@ -0,0 +1,37 @@
+package utils
+
+import (
+	"net"
+	"net/url"
+)
+
+// IsIntranetURL 判断监控地址的主机是否为内网 / 本机 IP（直填 IP 的虚拟局域网站点）。
+// 仅识别主机名为 IPv4/IPv6 字面量的情况；公网域名不在此列。
+func IsIntranetURL(raw string) bool {
+	u, err := url.Parse(raw)
+	if err != nil {
+		return false
+	}
+	host := u.Hostname()
+	if host == "" {
+		return false
+	}
+	ip := net.ParseIP(host)
+	if ip == nil {
+		return false
+	}
+	return isIntranetIP(ip)
+}
+
+func isIntranetIP(ip net.IP) bool {
+	if ip.IsLoopback() || ip.IsPrivate() || ip.IsLinkLocalUnicast() {
+		return true
+	}
+	// Go 1.17+ IsPrivate 已含 RFC1918、CGNAT 100.64/10、ULA 等；再兜底部分实现差异
+	if v4 := ip.To4(); v4 != nil {
+		if v4[0] == 100 && v4[1] >= 64 && v4[1] <= 127 {
+			return true
+		}
+	}
+	return false
+}

mengyaping-backend/utils/intranet_test.go

@@ -0,0 +1,24 @@
+package utils
+
+import "testing"
+
+func TestIsIntranetURL(t *testing.T) {
+	cases := []struct {
+		raw  string
+		want bool
+	}{
+		{"http://10.0.0.233:8080/path", true},
+		{"https://192.168.1.1/", true},
+		{"http://127.0.0.1:3000", true},
+		{"http://[fd00::1]/", true},
+		{"https://1.1.1.1/", false},
+		{"https://example.com/", false},
+		{"http://nas.local:8080", false},
+	}
+	for _, tc := range cases {
+		got := IsIntranetURL(tc.raw)
+		if got != tc.want {
+			t.Fatalf("%q: got %v want %v", tc.raw, got, tc.want)
+		}
+	}
+}