Issue 4630/replace default gateway

lib/Server.js

@@ -378,57 +378,30 @@ class Server {
     return /^[a-zA-Z][a-zA-Z\d+\-.]*:/.test(URL);
   }
 
-  /**
-   * @param {string} gateway
-   * @returns {string | undefined}
-   */
-  static findIp(gateway) {
-    const gatewayIp = ipaddr.parse(gateway);
-
-    // Look for the matching interface in all local interfaces.
-    for (const addresses of Object.values(os.networkInterfaces())) {
-      for (const { cidr } of /** @type {NetworkInterfaceInfo[]} */ (
-        addresses
-      )) {
-        const net = ipaddr.parseCIDR(/** @type {string} */ (cidr));
-
-        if (
-          net[0] &&
-          net[0].kind() === gatewayIp.kind() &&
-          gatewayIp.match(net)
-        ) {
-          return net[0].toString();
-        }
-      }
-    }
-  }
-
   /**
    * @param {"v4" | "v6"} family
    * @returns {Promise<string | undefined>}
    */
   static async internalIP(family) {
-    try {
-      const { gateway } = await require("default-gateway")[family]();
-
-      return Server.findIp(gateway);
-    } catch {
-      // ignore
-    }
-  }
-
-  /**
-   * @param {"v4" | "v6"} family
-   * @returns {string | undefined}
-   */
-  static internalIPSync(family) {
-    try {
-      const { gateway } = require("default-gateway")[family].sync();
+    let host;
+    Object.values(os.networkInterfaces())
+      .flatMap((networks) => networks ?? [])
+      .filter(
+        (network) =>
+          network &&
+          network.address &&
+          network.family === `IP${family}` &&
+          // I'm not sure whether I need to only filter to internal IP address
+          network.internal === true,
+      )
+      .forEach((network) => {
+        host = network.address;
+        if (host.includes(":")) {
+          host = `[${host}]`;
+        }
+      });
 
-      return Server.findIp(gateway);
-    } catch {
-      // ignore
-    }
+    return host;
   }
 
   /**