Login.php

<?php

 namespace App\Controllers;

 use CodeIgniter\RESTful\ResourceController;
 use CodeIgniter\API\ResponseTrait;
 use App\Models\UserModel;
 use Firebase\JWT\JWT;

 class Login extends ResourceController
 {
     /**
      * Return an array of resource objects, themselves in array format
      *
      * @return mixed
      */
     use ResponseTrait;
     public function index()
     {
         helper(['form']);
         $rules = [
             'email' => 'required|valid_email',
             'password' => 'required|min_length[6]'
         ];
         if(!$this->validate($rules)) return $this->fail($this->validator->getErrors());
         $model = new UserModel();
         $user = $model->where("email", $this->request->getVar('email'))->first();
         if(!$user) return $this->failNotFound('Email Not Found');

         $verify = password_verify($this->request->getVar('password'), $user['password']);
         if(!$verify) return $this->fail('Wrong Password');

         $key = getenv('TOKEN_SECRET');
         $payload = array(
             "iat" => 1356999524,
             "nbf" => 1357000000,
             "uid" => $user['id'],
             "email" => $user['email']
         );

         $token = JWT::encode($payload, $key);

         return $this->respond($token);
         $id = $model->getInsertID();


         /**
          * contoh error
          */
         $data_error = [
             'success' => false,
             'error' => 'email tidak bisa digunakan.'
         ];
         return $this->response->setStatusCode(400)->setJSON($data_error);

         /**
          * contoh sukses
          */
         $data = [
             'success' => true,
             'id' => 123,
         ];
         return $this->response->setJSON($data_sukses);

     }
 }