from flask import request, session
from requests_oauthlib import OAuth2Session

from config import *
from helpers import HydraError


class HydraOauth:
    SESSION_KEY = "oauth_state"

    @staticmethod
    def authorize():
        try:
            hydra = OAuth2Session(HYDRA_CLIENT_ID)
            authorization_url, state = hydra.authorization_url(
                HYDRA_AUTHORIZATION_BASE_URL
            )

            # State is used to prevent CSRF, keep this for later.
            session[HydraOauth.SESSION_KEY] = state

            return authorization_url
        except Exception as err:
            raise HydraError(str(err), 500)

    @staticmethod
    def get_token(state):
        try:
            hydra = OAuth2Session(HYDRA_CLIENT_ID, state=state)
            token = hydra.fetch_token(
                TOKEN_URL,
                client_secret=HYDRA_CLIENT_SECRET,
                authorization_response=request.url,
            )

            session["hydra_token"] = token
            return token
        except Exception as err:
            raise HydraError(str(err), 500)