Manheim API Auth Example

main.py

import json, os
from oauthlib.oauth2 import BackendApplicationClient
from requests_oauthlib import OAuth2Session
from oauthlib.oauth2 import TokenExpiredError
from requests.models import Response

# Example Values
# CLIENT_ID=123456
# CLIENT_SECRET=secret
# ENVIRONMENT=integration1.
# SCOPES=scope1 scope2
# GRANT_TYPE=client_credentials

client_id = os.getenv('CLIENT_ID')
client_secret = os.getenv('CLIENT_SECRET')
token_endpoint = f'https://{os.getenv("ENVIRONMENT")}api.manheim.com/oauth2/token.oauth2'
scopes = os.getenv('SCOPES')
grant_type = os.getenv('GRANT_TYPE')


def get_client() -> 'OAuth2Session':
    backend_client = BackendApplicationClient(client_id=client_id, client_secret=client_secret)
    oauth_client = OAuth2Session(client=backend_client)
    get_token(oauth_client)
    return oauth_client


def get_token(oauth_client: OAuth2Session) -> str:
    body = oauth_client.fetch_token(
        token_url=token_endpoint,
        client_id=client_id,
        client_secret=client_secret,
        body=f'grant_type={grant_type}&scope={scopes}'
    )
    return body['access_token']


def token_valid(resp: Response):
    if resp.status_code == 401 and 'Server' in resp.headers and 'Mashery Proxy' in resp.headers['Server']:
        return False
    return True


def make_request(client: OAuth2Session, method: str, url: str, **kwargs):
    try:
        resp = client.request(method, url, *kwargs)
        if not token_valid(resp):
            raise TokenExpiredError()
        return resp
    except TokenExpiredError as e:
        get_token(client)
        resp = client.request(method, url, *kwargs)
        if not token_valid(resp):
            print(e)
            print(json.loads(resp.text))
            exit(1)
        return resp


url = f"https://{os.getenv('ENVIRONMENT')}api.manheim.com/valuations/colors"
headers = {"Content-Type":"application/x-www-form-urlencoded"}

client = get_client()
print(json.loads(make_request(client, 'GET', url, headers=headers).text))

requirements.txt

requests~=2.25.1
requests-oauthlib
oauthlib~=3.1.1