[[oktatas:web:back-end_framework:express:ervenyesseg|< Érvényesség]]

====== Express - Érvényesség Yup-pal ======

  * **Szerző:** Sallai András
  * Copyright (c) 2024, Sallai András
  * Licenc: [[https://creativecommons.org/licenses/by-sa/4.0/|CC BY-SA 4.0]]
  * Web: https://szit.hu

===== Bevezetés =====

Célunk a bejövő adatok ellenőrzése. A bejövő adatokat ellenőrizhetjük a kontrollerben,
a modellben vagy írhatunk rá köztes szoftvert.

  * https://www.npmjs.com/package/yup (2024)
===== Függőségek =====

  npm install yup

===== Köztes szoftver =====


<code javascript app/middlewares/userValidator.js>
import { object, string } from 'yup';

const userRegisterValidator = (req, res, next) => {
  const userSchema = object({
    name: string().required(),
    email: string().email().required(),
    password: string().required()
  })

  userSchema.validate(req.body)
    .then(() => next())
    .catch(err => {
      res.status(400)
      res.json({ 
        success: false, 
        message: err.message 
      })
    })
}

const userLoginValidator = (req, res, next) => {
  const userSchema = object({
    name: string().required(),
    password: string().required()
  })

  userSchema.validate(req.body)
    .then(() => next())
    .catch(err => {
      res.status(400)
      res.json({ 
        success: false, 
        message: err.message 
      })
    })
}

export { userRegisterValidator, userLoginValidator }

</code>


===== Használat =====

<code javascript>
import { 
    userRegisterValidator, 
    userLoginValidator 
} from '../middlewares/userValidator.js'

//...

router.post('/register', [userRegisterValidator], AuthController.register)
router.post('/login', [userLoginValidator],AuthController.login)
</code>


===== Dolgozó =====

<code javascript app/middlewares/employeeValidator.js>
import { object, string, number } from 'yup';

const employeeCreateValidator = (req, res, next) => {
  const employeeSchema = object({
    name: string().required(),
    city: string(),
    salary: number()
  })

  employeeSchema.validate(req.body)
    .then(() => next())
    .catch(err => {
      res.status(400)
      res.json({ 
        success: false, 
        message: err.message 
      })
    })
}

export { employeeCreateValidator }
</code>


<code javascript>
router.post('/employees', 
  [employeeCreateValidator], 
  EmployeeController.store)

</code>