Generate access token in odoo

In this blog we will explain how to generate access token in odoo for each user step by step , so 

1- create new class which is inherits res.users class

2- create new char field which will contain the token , and it must be compute field

3- create function to generate the token

as bellow 

from odoo import models, fields, api, _
import hashlib
import hmac
import base64
import string
import math, random
from passlib import pwd, hash


class ResUsers(models.Model):
    _inherit = 'res.users'

    access_token = fields.Char(string="Access Token", readonly=True, compute='generate_access_token')

    def generate_access_token(self):
        for rec in self:
            token = ""

            # first way
            # pre_token = rec.name+rec.login
            # token = hash.pbkdf2_sha512.hash(pre_token)

            # second way
            hash_object = hashlib.sha256(rec.password.encode())
            token = hash_object.hexdigest()

            rec.sudo().write({'access_token': token})