Authentication for the new API

[dgilge]

I've looked for a solution to authenticate against the new Newsletter2Go API (https://docs.newsletter2go.com/). Here is what works for me. Maybe it will be a help for somebody.

from oauthlib.oauth2 import Client
from oauthlib.oauth2.rfc6749.parameters import prepare_token_request
from requests_oauthlib import OAuth2Session


class Newsletter2GoClient(Client):
    def prepare_request_body(self, username, password, body='', scope=None, **kwargs):
        """
        Sets the Newsletter2Go specific grant type.
        """
        prepared_token = prepare_token_request(
            'https://nl2go.com/jwt',
            body=body,
            username=username,
            password=password,
            scope=scope,
            **kwargs,
        )
        return prepared_token


client_id, client_secret = AUTH_KEY.split(':')
client = Newsletter2GoClient(client_id=client_id)
oauth = OAuth2Session(client=client)
oauth.fetch_token(
    token_url='https://api.newsletter2go.com/oauth/v2/token',
    username=USERNAME,
    password=PASSWORD,
    client_id=client_id,
    client_secret=client_secret,
)

response1 = oauth.post(some_url, json=some_data)
response2 = oauth.get(another_url)

Documentation here: https://requests-oauthlib.readthedocs.io/en/latest/oauth2_workflow.html#legacy-application-flow