Make the code part in send customizable / overrideable

[Codethier]

The current 5 char generated code can be brute forced, if it were possible to make it a lot longer / overrideable it would be possible to use magicLogin in a way that doesn't require the clicking of the link on the same device.

Something like this:

send = (req: Request, res: Response,code?: string): void => {
    const payload = req.method === 'GET' ? req.query : req.body;
    if (
      req.method === 'POST' &&
      !req.headers['content-type']?.match('application/json')
    )
 {
      res
        .status(400)
        .send('Content-Type must be application/json when using POST method.');
      return;
    } if (!payload.destination) {
      res.status(400).send('Please specify the destination.');
      return;
    }

    if (!code){
      code = Math.floor(Math.random() * 90000) + 10000 + '';
    }