adding 'open in fredy'

lib/utils/detectBaseUrl.js

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+import os from 'os';
+import fs from 'fs';
+
+const DOCKER_BRIDGE_PREFIXES = ['172.17.', '172.18.', '172.19.', '172.20.'];
+
+export function isRunningInDocker() {
+  if (process.env.FREDY_DOCKER === '1') return true;
+  try {
+    fs.accessSync('/.dockerenv');
+    return true;
+  } catch {
+    /* not docker */
+  }
+  try {
+    const cgroup = fs.readFileSync('/proc/self/cgroup', 'utf8');
+    return /docker|containerd|kubepods/.test(cgroup);
+  } catch {
+    return false;
+  }
+}
+
+function isDockerBridgeIp(addr) {
+  return DOCKER_BRIDGE_PREFIXES.some((prefix) => addr.startsWith(prefix));
+}
+
+export function detectLocalIp() {
+  if (isRunningInDocker()) {
+    return process.env.FREDY_HOST_IP ?? '172.17.0.1';
+  }
+  const ifaces = os.networkInterfaces();
+  for (const preferred of ['en0', 'eth0', 'wlan0', 'ens3', 'ens18']) {
+    for (const entry of ifaces[preferred] ?? []) {
+      if (entry.family === 'IPv4' && !entry.internal && !isDockerBridgeIp(entry.address)) {
+        return entry.address;
+      }
+    }
+  }
+  for (const iface of Object.values(ifaces)) {
+    for (const entry of iface ?? []) {
+      if (entry.family === 'IPv4' && !entry.internal && !isDockerBridgeIp(entry.address)) {
+        return entry.address;
+      }
+    }
+  }
+  return 'localhost';
+}
+
+export function guessBaseUrl(port) {
+  return `http://${detectLocalIp()}:${port}`;
+}