signup

backend.js

router.post("/signup", async (req, res) => {
  const username = req.body.username;
  const password = req.body.password;

  if (username !== undefined && username.trim().length > 0) {
    const user = await database().ref(`accounts/${username}`).get();
    if (user.exists()) {
      res.status(400).json({
        error: {
          message: "Username already exists",
        },
      });
      return;
    }
  } else {
    res.status(412).json({
      error: {
        message: "Username can't be empty",
      },
    });
    return;
  }

  if (password !== undefined && password.trim().length > 0) {
    const salt = crypto.randomBytes(16).toString("base64");
    const pw = await scrypt.hash(password, salt);
    const user = {
      created: database.ServerValue.TIMESTAMP,
      password: pw,
      salt: salt,
    };
    await database().ref(`accounts/${username}`).set(user);
    await sendToken(res, username);
  } else {
    res.status(412).json({
      error: {
        message: "Password can't be empty",
      },
    });
  }
});