first commit

utils/index.ts

@@ -0,0 +1,26 @@
+export function isPrivateIP(host: string): boolean {
+    try {
+      const ip = host.startsWith('[') ? host.slice(1, -1) : host;
+      if (ip === 'localhost') return true;
+
+      // IPv4 private ranges
+      if (ip.includes('.')) {
+        const parts = ip.split('.').map(Number);
+        return parts[0] === 10 ||
+          (parts[0] === 172 && parts[1] >= 16 && parts[1] <= 31) ||
+          (parts[0] === 192 && parts[1] === 168) ||
+          (parts[0] === 169 && parts[1] === 254);
+      }
+
+      // IPv6 private ranges
+      if (ip.includes(':')) {
+        return ip.startsWith('fc00::/7') ||
+               ip.startsWith('fe80::/10') ||
+               ip.startsWith('::1');
+      }
+
+      return false;
+    } catch {
+      return false;
+    }
+  }