Add role checks (#21)

* Add role checks

* Remove moved Roles enum

src/utils/jwt.js

@@ -0,0 +1,14 @@
+export const parsePayload = (token) => {
+  if (!token) return null;
+  const parts = token.split(".");
+  if (parts.length < 2) return null;
+  return JSON.parse(decode(parts[1]));
+};
+
+export const decode = (payload) => {
+  const l = (payload.length % 4);
+  if (l > 0) {
+    payload += "=".repeat(4 - l);
+  }
+  return atob(payload);
+};