How to use the oauthenticator.oauth2.OAuthenticator function in oauthenticator

def azure_authorize_url_for(tentant):
    return 'https://login.microsoftonline.com/{0}/oauth2/authorize'.format(
        tentant)


class AzureAdMixin(OAuth2Mixin):
    tenant_id = os.environ.get('AAD_TENANT_ID', '')
    _OAUTH_ACCESS_TOKEN_URL = azure_token_url_for(tenant_id)
    _OAUTH_AUTHORIZE_URL = azure_authorize_url_for(tenant_id)


class AzureAdLoginHandler(OAuthLoginHandler, AzureAdMixin):
    pass


class AzureAdOAuthenticator(OAuthenticator):
    login_service = Unicode(
		os.environ.get('LOGIN_SERVICE', 'Azure AD'),
		config=True,
		help="""Azure AD domain name string, e.g. My College"""
	)

    login_handler = AzureAdLoginHandler

    tenant_id = Unicode(config=True)
    username_claim = Unicode(config=True)

    @default('tenant_id')
    def _tenant_id_default(self):
        return os.environ.get('AAD_TENANT_ID', '')

    @default('username_claim')

return {"Accept": "application/json",
            "User-Agent": "JupyterHub",
            "Authorization": "Bearer {}".format(access_token)
           }


class BitbucketMixin(OAuth2Mixin):
    _OAUTH_AUTHORIZE_URL = "https://bitbucket.org/site/oauth2/authorize"
    _OAUTH_ACCESS_TOKEN_URL = "https://bitbucket.org/site/oauth2/access_token"


class BitbucketLoginHandler(OAuthLoginHandler, BitbucketMixin):
    pass


class BitbucketOAuthenticator(OAuthenticator):

    login_service = "Bitbucket"
    client_id_env = 'BITBUCKET_CLIENT_ID'
    client_secret_env = 'BITBUCKET_CLIENT_SECRET'
    login_handler = BitbucketLoginHandler

    team_whitelist = Set(
        config=True,
        help="Automatically whitelist members of selected teams",
    )

    bitbucket_team_whitelist = team_whitelist


    headers = {"Accept": "application/json",
               "User-Agent": "JupyterHub",

from jupyterhub.auth import LocalAuthenticator

from .oauth2 import OAuthLoginHandler, OAuthenticator

AUTH0_SUBDOMAIN = os.getenv('AUTH0_SUBDOMAIN')

class Auth0Mixin(OAuth2Mixin):
    _OAUTH_AUTHORIZE_URL = "https://%s.auth0.com/authorize" % AUTH0_SUBDOMAIN
    _OAUTH_ACCESS_TOKEN_URL = "https://%s.auth0.com/oauth/token" % AUTH0_SUBDOMAIN


class Auth0LoginHandler(OAuthLoginHandler, Auth0Mixin):
    pass


class Auth0OAuthenticator(OAuthenticator):

    login_service = "Auth0"

    login_handler = Auth0LoginHandler

    async def authenticate(self, handler, data=None):
        code = handler.get_argument("code")
        # TODO: Configure the curl_httpclient for tornado
        http_client = AsyncHTTPClient()

        params = {
            'grant_type': 'authorization_code',
            'client_id': self.client_id,
            'client_secret': self.client_secret,
            'code':code,
            'redirect_uri': self.get_callback_url(handler)

from traitlets import Dict, Unicode, List, default, validate

from jupyterhub.auth import LocalAuthenticator
from jupyterhub.utils import url_path_join

from .oauth2 import OAuthLoginHandler, OAuthCallbackHandler, OAuthenticator

def check_user_in_groups(member_groups, allowed_groups):
    # Check if user is a member of any group in the allowed groups
    if any(g in member_groups for g in allowed_groups):
        return True  # user _is_ in group
    else:
        return False


class GoogleOAuthenticator(OAuthenticator, GoogleOAuth2Mixin):
    google_api_url = Unicode("https://www.googleapis.com", config=True)

    @default('google_api_url')
    def _google_api_url(self):
        """get default google apis url from env"""
        google_api_url = os.getenv('GOOGLE_API_URL')

        # default to googleapis.com
        if not google_api_url:
            google_api_url = 'https://www.googleapis.com'

        return google_api_url

    @default('scope')
    def _scope_default(self):
        return ['openid', 'email']

from traitlets import List, Set, Unicode, default

from .common import next_page_from_links
from .oauth2 import OAuthLoginHandler, OAuthenticator


def _api_headers(access_token):
    return {
        "Accept": "application/json",
        "User-Agent": "JupyterHub",
        "Authorization": "token {}".format(access_token),
    }


class GitHubOAuthenticator(OAuthenticator):

    # see github_scopes.md for details about scope config
    # set scopes via config, e.g.
    # c.GitHubOAuthenticator.scope = ['read:org']

    login_service = "GitHub"

    github_url = Unicode("https://github.com", config=True)

    @default("github_url")
    def _github_url_default(self):
        github_url = os.environ.get("GITHUB_URL")
        if not github_url:
            # fallback on older GITHUB_HOST config,
            # treated the same as GITHUB_URL
            host = os.environ.get("GITHUB_HOST")

return {"Accept": "application/json",
            "User-Agent": "JupyterHub",
            "Authorization": "Bearer {}".format(access_token)
           }


class GitLabMixin(OAuth2Mixin):
    _OAUTH_AUTHORIZE_URL = "%s/oauth/authorize" % GITLAB_URL
    _OAUTH_ACCESS_TOKEN_URL = "%s/oauth/access_token" % GITLAB_URL


class GitLabLoginHandler(OAuthLoginHandler, GitLabMixin):
    pass


class GitLabOAuthenticator(OAuthenticator):
    # see gitlab_scopes.md for details about scope config
    # set scopes via config, e.g.
    # c.GitLabOAuthenticator.scope = ['read_user']

    login_service = "GitLab"

    client_id_env = 'GITLAB_CLIENT_ID'
    client_secret_env = 'GITLAB_CLIENT_SECRET'
    login_handler = GitLabLoginHandler

    gitlab_group_whitelist = Set(
        config=True,
        help="Automatically whitelist members of selected groups",
    )
    gitlab_project_id_whitelist = Set(
        config=True,

from tornado.auth import OAuth2Mixin
from tornado import web

from tornado.httputil import url_concat
from tornado.httpclient import HTTPRequest, AsyncHTTPClient

from jupyterhub.auth import LocalAuthenticator

from traitlets import Unicode, Dict, Bool, Union, default, observe
from .traitlets import Callable

from .oauth2 import OAuthLoginHandler, OAuthenticator


class GenericOAuthenticator(OAuthenticator):

    login_service = Unicode("OAuth 2.0", config=True)

    extra_params = Dict(help="Extra parameters for first POST request").tag(config=True)

    username_key = Union(
        [Unicode(os.environ.get('OAUTH2_USERNAME_KEY', 'username')), Callable()],
        config=True,
        help="""
        Userdata username key from returned json for USERDATA_URL.

        Can be a string key name or a callable that accepts the returned
        json (as a dict) and returns the username.  The callable is useful
        e.g. for extracting the username from a nested object in the
        response.
        """,

async def clear_tokens(self, user):
        """Revoke and clear user tokens from the database"""
        state = await user.get_auth_state()
        if state:
            await self.authenticator.revoke_service_tokens(state.get('tokens'))
            self.log.info(
                'Logout: Revoked tokens for user "{}" services: {}'.format(
                    user.name, ','.join(state['tokens'].keys())
                )
            )
            state['tokens'] = {}
            await user.save_auth_state(state)


class GlobusOAuthenticator(OAuthenticator):
    """The Globus OAuthenticator handles both authorization and passing
    transfer tokens to the spawner. """

    login_service = 'Globus'
    logout_handler = GlobusLogoutHandler

    @default("userdata_url")
    def _userdata_url_default(self):
        return "https://auth.globus.org/v2/oauth2/userinfo"

    @default("authorize_url")
    def _authorize_url_default(self):
        return "https://auth.globus.org/v2/oauth2/authorize"

    @default("revocation_url")
    def _revocation_url_default(self):

class CILogonLoginHandler(OAuthLoginHandler, CILogonMixin):
    """See http://www.cilogon.org/oidc for general information."""

    def authorize_redirect(self, *args, **kwargs):
        """Add idp, skin to redirect params"""
        extra_params = kwargs.setdefault('extra_params', {})
        if self.authenticator.idp:
            extra_params["selected_idp"] = self.authenticator.idp
        if self.authenticator.skin:
            extra_params["skin"] = self.authenticator.skin

        return super().authorize_redirect(*args, **kwargs)


class CILogonOAuthenticator(OAuthenticator):
    login_service = "CILogon"

    client_id_env = 'CILOGON_CLIENT_ID'
    client_secret_env = 'CILOGON_CLIENT_SECRET'
    login_handler = CILogonLoginHandler

    scope = List(Unicode(), default_value=['openid', 'email', 'org.cilogon.userinfo'],
                 config=True,
                 help="""The OAuth scopes to request.

        See cilogon_scope.md for details.
        At least 'openid' is required.
        """,
                 )

    @validate('scope')

OPENSHIFT_REST_API_URL = os.environ.get('OPENSHIFT_REST_API_URL') or OPENSHIFT_URL

class OpenShiftMixin(OAuth2Mixin):
    _OAUTH_AUTHORIZE_URL = "%s/oauth/authorize" % OPENSHIFT_AUTH_API_URL
    _OAUTH_ACCESS_TOKEN_URL = "%s/oauth/token" % OPENSHIFT_AUTH_API_URL


class OpenShiftLoginHandler(OAuthLoginHandler, OpenShiftMixin):
    # This allows `Service Accounts as OAuth Clients` scenario
    # https://docs.openshift.org/latest/architecture/additional_concepts/authentication.html#service-accounts-as-oauth-clients
    @property
    def scope(self):
        return self.authenticator.scope


class OpenShiftOAuthenticator(OAuthenticator):

    login_service = "OpenShift"

    login_handler = OpenShiftLoginHandler

    scope = ['user:info']

    users_rest_api_path = '/apis/user.openshift.io/v1/users/~'

    async def authenticate(self, handler, data=None):
        code = handler.get_argument("code")
        # TODO: Configure the curl_httpclient for tornado
        http_client = AsyncHTTPClient()

        # Exchange the OAuth code for a OpenShift Access Token
        #