I have application written in PHP, and I would like to authenticate the user from PHP page and redirect to the ODOO without letting him to enter the credientials.

What I understood the /web/login route authenticate the user and set the cookie name "session_id" with the value. I made a route /login that implements authenticate method and pass the database, login  and password 

from odoo.http import request, route, Controller

class Auth(Controller):

    @route('/login', auth='none', type="json")

    def login(self, db, login, password):

        request.session.authenticate(db, login, password)