feat: Modify logger to log to file that supports fail2ban (#284)

server/utils/remoteAddress.js

@@ -0,0 +1,27 @@
+/**
+ * The IP address of the client that just made a request to this application, whether
+ * or not the TRUST_PROXY env variable is true and if endpoint accessed through a proxy.
+ * @param {Request} request The endpoint Request object
+ * @returns The IP address of the client that just made a request
+ */
+const getRemoteAddress = (request) => {
+  let remoteAddress = request.ip;
+
+  // Assert if "X-Forwarded-For" header contains any addresses
+  if (process.env.TRUST_PROXY && !_.isEmpty(request.ips)) {
+    // eslint-disable-next-line prefer-destructuring
+    remoteAddress = request.ips[0];
+  }
+
+  // Convert address from IPV6 to IPV4 if client device is IPV4.
+  const defaultIPV6Regex = /^::ffff:((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$/g;
+  if (remoteAddress.match(defaultIPV6Regex)) {
+    remoteAddress = remoteAddress.replace('::ffff:', '');
+  }
+
+  return remoteAddress;
+};
+
+module.exports = {
+  getRemoteAddress,
+};