Auth handler that handles new signups on the platform

AuthController.ts

export const signUpHandler: RequestHandler<{}, {}, SignUpBody> = async (
  req,
  res
) => {
  const { firstName, lastName, email, password } = req.body

  const isAlreadyRegistered = await User.findOne({
    email,
  })
  if (isAlreadyRegistered) {
    return res.status(409).json({
      msg: 'An account with that email already exists. Please log in instead.',
    })
  }

  try {
    const user = new User({
      firstName,
      lastName,
      email,
      password,
    })

    const verificationToken = await user.getEmailVerificationToken()
  
    const verificationLink = `${req.get(
      'origin'
    )}/auth/email-verification/${verificationToken}`
  
    await user.save((err) => {
      if (err) {
        return res.status(500).json({
          msg: 'Something went wrong while registering you. Please try later or contact [email protected]',
        })
      }
    })

    try {
      await new Email({
        email: user.email,
        firstName: user.firstName,
      }).send({
        subject: '[neoG Camp] Please verify your email address.',
        template: 'verify-email',
        variables: {
          verificationLink: verificationLink,
        },
      })

      return res.status(200).json({
        msg: `An email with verification link has been sent to you at ${user.email}. Please check your inbox.`,
        user: {
          email: user.email,
          firstName: user.firstName,
          lastName: user.lastName,
          _id: user._id,
        },
      })
  
    } catch (error) {
      user.verificationToken = undefined
      user.verificationTokenExpiresIn = undefined
      user.isVerified = false
      user.save()

      res.status(500).json({
        msg: 'There was an error while sending verification email. Please click the resend button.',
      })
    }
  
  } catch (error) {
    res.status(500).json({
      msg: 'Something went wrong while registering you.',
      code: 'INTERNAL_ERROR',
    })
  }
}