mongoose

import { Request, Response } from "express";
import { Token, Data } from "../util/token";
import { User, UserDoc } from "../models/user";

export const returnUser = async (
  req: Request,
  res: Response,
  token: string
): Promise<UserDoc | null> => {
  // Need to return promise
  if (!token) res.status(400).send({ error: "Token is not present" });

  let decoded = await Token.decode(token);

  if (decoded === false) {
    res.status(400).send({ error: "Invalid Token" });
  }

  //  as is User-Defined Type Guards
  let email = (decoded as Data).email;
  let user = await User.findOne({ email });

  if (!user) res.status(400).send({ error: "User not found" });
  if ((user as UserDoc).createdAt.getTime() !== (decoded as Data).epoch)
    res.status(400).send({ error: "Invalid timestamp" });

  return user;
};