moving jwt and login related things to new auth module

freechat-client/src/auth.js

@@ -0,0 +1,17 @@
+const jsonwebtoken = require('jsonwebtoken')
+
+/**
+ * Checks to see if the jwt is not expired basically
+ * 
+ * @param {String} jwt token string to verify
+ * @returns Boolean
+ */
+exports.valid_jwt = function (jwt) {
+    const result = jsonwebtoken.decode(jwt)
+    if(result) {
+        const now = Math.floor(Date.now() / 1000)
+        return result['exp'] > now // does it expire later?
+    } else {
+        return false;
+    }
+}