import requests


class Oauth:
    def __init__(self, config: dict):
        self.token_url = config['token_url']
        self.introspection_url = config['introspection_url']
        self.client_id = config['client_id']
        self.client_secret = config['client_secret']

        auth_url = config['authorization_url']
        auth_args=f'response_type=code&client_id={self.client_id}'
        self.auth_url = f'{auth_url}?{auth_args}'

        self.session = requests.Session()
        self.session.auth = (self.client_id, self.client_secret)

    def request_access_token(self, one_time_code: str) -> dict:
        body = {'grant_type': 'authorization_code',
                'code': one_time_code}
        response = self.session.post(self.token_url, data=body)
        return response.json()['access_token']

    def authorize(self, token: str) -> dict:
        response = self.session.post(self.introspection_url,
                                     data=token)
        try:
            response.raise_for_status()
        except requests.HTTPError:
            return None
        return response.json()