allow passing FB event number as parameter

lib/utils.js

@@ -0,0 +1,26 @@
+const checkValidURL = (url) => {
+  return checkURLFormat(url) ||
+    checkNumberURLParameter(url)
+}
+
+const checkURLFormat = (url) => {
+  return /^(http:\/\/www\.|https:\/\/www\.|http:\/\/|https:\/\/)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/.test(url)
+}
+
+const checkNumberURLParameter = (url) => {
+  return /^\d+$/.test(url)
+}
+
+const createParserError = () => {
+  const err = new Error('Unable to parse event data.')
+  err.statusCode = 422
+
+  return err
+}
+
+module.exports = {
+  checkValidURL,
+  checkURLFormat,
+  checkNumberURLParameter,
+  createParserError,
+}