local spectators get real video maybe if it works

server/src/helpers/ipResolver.js

@@ -1,3 +1,5 @@
+const net = require('net');
+
 function extractForwardedIp(value) {
   if (typeof value === 'string' && value.trim()) {
     return value.split(',')[0].trim();
@@ -8,6 +10,56 @@ function extractForwardedIp(value) {
   return null;
 }
 
+function normalizeIp(value) {
+  if (!value) return null;
+  let ip = String(value).trim();
+  if (!ip) return null;
+  if (ip.startsWith('::ffff:')) {
+    ip = ip.slice(7);
+  }
+  if (ip.includes('%')) {
+    ip = ip.split('%')[0];
+  }
+  return ip.trim() || null;
+}
+
+function isPrivateIpv4(ip) {
+  const parts = ip.split('.').map((part) => Number(part));
+  if (parts.length !== 4 || parts.some((part) => Number.isNaN(part))) {
+    return false;
+  }
+  const [a, b] = parts;
+  if (a === 10) return true;
+  if (a === 127) return true;
+  if (a === 192 && b === 168) return true;
+  return a === 172 && b >= 16 && b <= 31;
+}
+
+function isPrivateIpv6(ip) {
+  const lower = ip.toLowerCase();
+  if (lower === '::1') return true;
+  if (lower.startsWith('fc') || lower.startsWith('fd')) return true; // fc00::/7
+  return (
+    lower.startsWith('fe8') ||
+    lower.startsWith('fe9') ||
+    lower.startsWith('fea') ||
+    lower.startsWith('feb')
+  ); // fe80::/10
+}
+
+function isLocalNetwork(ip) {
+  const normalized = normalizeIp(ip);
+  if (!normalized) return false;
+  const version = net.isIP(normalized);
+  if (version === 4) {
+    return isPrivateIpv4(normalized);
+  }
+  if (version === 6) {
+    return isPrivateIpv6(normalized);
+  }
+  return false;
+}
+
 function getSocketIp(socket) {
   if (!socket) return null;
   const headers = socket.handshake?.headers || {};
@@ -42,4 +94,6 @@ function getRequestIp(req, override) {
 module.exports = {
   getSocketIp,
   getRequestIp,
+  isLocalNetwork,
+  normalizeIp,
 };