text: #
  # Copyright (c) 2022 Airbyte, Inc., all rights reserved.
  #
  
  
  from typing import Any, List, Mapping, MutableMapping, Optional, Tuple
  
  import pendulum
  import requests
  from deprecated import deprecated
  
  from .core import HttpAuthenticator
  
  
  @deprecated(version="0.1.20", reason="Use airbyte_cdk.sources.streams.http.requests_native_auth.Oauth2Authenticator instead")
  class Oauth2Authenticator(HttpAuthenticator):
      """
      Generates OAuth2.0 access tokens from an OAuth2.0 refresh token and client credentials.
      The generated access token is attached to each request via the Authorization header.
      """
  
      def __init__(
          self,
          token_refresh_endpoint: str,
          client_id: str,
          client_secret: str,
          refresh_token: str,
          scopes: List[str] = None,
          refresh_access_token_headers: Optional[Mapping[str, Any]] = None,
          refresh_access_token_authenticator: Optional[HttpAuthenticator] = None,
      ):
          self.token_refresh_endpoint = token_refresh_endpoint
          self.client_secret = client_secret
          self.client_id = client_id
          self.refresh_token = refresh_token
          self.scopes = scopes
          self.refresh_access_token_headers = refresh_access_token_headers
          self.refresh_access_token_authenticator = refresh_access_token_authenticator
  
          self._token_expiry_date = pendulum.now().subtract(days=1)
          self._access_token = None
  
      def get_auth_header(self) -> Mapping[str, Any]:
          return {"Authorization": f"Bearer {self.get_access_token()}"}
  
      def get_access_token(self):
          if self.token_has_expired():
              t0 = pendulum.now()
              token, expires_in = self.refresh_access_token()
              self._access_token = token
              self._token_expiry_date = t0.add(seconds=expires_in)
  
          return self._access_token
  
      def token_has_expired(self) -> bool:
          return pendulum.now() > self._token_expiry_date
  
      def get_refresh_request_body(self) -> Mapping[str, Any]:
          """Override to define additional parameters"""
          payload: MutableMapping[str, Any] = {
              "grant_type": "refresh_token",
              "client_id": self.client_id,
              "client_secret": self.client_secret,
              "refresh_token": self.refresh_token,
          }
  
          if self.scopes:
              payload["scopes"] = self.scopes
  
          return payload
  
      def refresh_access_token(self) -> Tuple[str, int]:
          """
          returns a tuple of (access_token, token_lifespan_in_seconds)
          """
          try:
              response = requests.request(
                  method="POST",
                  url=self.token_refresh_endpoint,
                  data=self.get_refresh_request_body(),
                  headers=self.get_refresh_access_token_headers(),
              )
              response.raise_for_status()
              response_json = response.json()
              return response_json["access_token"], response_json["expires_in"]
          except Exception as e:
              raise Exception(f"Error while refreshing access token: {e}") from e
  
      def get_refresh_access_token_headers(self):
          headers = {}
          if self.refresh_access_token_headers:
              headers = self.refresh_access_token_headers
          if self.refresh_access_token_authenticator:
              refresh_auth_headers = self.refresh_access_token_authenticator.get_auth_header()
              headers.update(refresh_auth_headers)
          return headers
  