Create a heater endpoint that requires an integer value for mode. Valid values accepted for mode are 0 for normal and 1 for energy saving. If mode value is incorrect return HTTP code 422 with an error message. The endpoint should also have a required value of temperature which accepts an integer.

The end-point should be protected so be sure to require a JWT for use as was done in exercise 6.

1. Create a new route file at routes/devices/heater.js , it should use express-validator to check that temperature and mode is numeric, it should also check that mode is minimum 0 and maximum 1. If error checking passes it should return a success message using the values provided:

   const express = require('express');
   const { check, validationResult } = require('express-validator/check');
   const router = express.Router();
   
   // Function to run if user sends a PUT request
   router.put(['/', '/actions/fade'], [
       check('mode').isNumeric().isLength({ min: 0, max: 1 }),
       check('temperature').isNumeric()
     ],
     (req, res) => {
       const errors = validationResult(req);
       if (!errors.isEmpty()) {
         return res.status(422).json({ errors: errors.array() });
       }
       let temperature = req.body.temperature;
       let mode = req.body.mode;
   
       let message = `success: temperature set to ${temperature} mode is ${mode}`;
       res.json({"message": message});
   });
   
   // Export route so it is available to import
   module.exports = router;
   

2. Import routes/devices/heater.js in server.js:

   let heater = require('./routes/devices/heater');
   

3. Associate heater with route /devices/heater, making sure to pass the isCheckedIn middleware:

   app.use('/devices/heater', isCheckedIn, heater);
   

4. Start the project by running npm start.

5. In another window first get a valid JWT with curl:

   TOKEN=$(curl -sd "name=john" -X POST http://localhost:3000/check-in \
     | jq -r ".token")
   

6. Test the endpoint with correct values like so, it should return a success message:

   curl -sd "mode=0&temperature=25" -X PUT \
     -H "Authorization: Bearer ${TOKEN}" \
     http://localhost:3000/devices/heater \
     | jq
   

7. Finally test with some false value like so:

   curl -sd "mode=9&temperature=25" -X PUT \
     http://localhost:3000/devices/heater \
     | jq