add in SAML auth

"""Provide authentication methods."""

from urllib.parse import urlparse, urlencode

from common.env import check_environment as ce

try:

        return None

    connection.search(root_dn, user_search_filter, attributes=["*"])

    return connection.entries[0]

def authenticate_saml(

    scheme,

    host,

    url,

    method,

    args,

    form,

    process_success=lambda _: None,

    process_failure=lambda _: None,

    saml_path=None,

):

    """

    Handles SAML authentication by processing the necessary components extracted from a web request.

    This function manages SAML Single Sign-On (SSO), Single Log-Out (SLO), and Assertion Consumer Service (ACS)

    endpoints. It accepts individual components typically found in a web request and utilizes them to process

    SAML requests and responses, delegating outcome handling to provided callback functions.

    Parameters:

    - scheme (str): The request scheme ('http' or 'https').

    - host (str): The request host.

    - url (str): The full URL of the request.

    - method (str): The HTTP method of the request.

    - args (dict): The query parameters of the request as a dictionary.

    - form (dict): The form data of the request as a dictionary.

    - process_success (Callable): Function to call after successful authentication or logout to handle the response.

    - process_failure (Callable): Function to call when an error occurs or no relevant SAML action is found.

    - saml_path (str, optional): Custom path for SAML configuration files. If not provided, environment variable

      'SAML_PATH' is used.

    Returns:

    - Result of the `process_success` or `process_failure` callable depending on the SAML processing outcome.

    Raises:

    - Exception: Descriptive exceptions can be raised depending on the SAML processing errors or misconfigurations.

    Usage:

    This function is designed to be framework-agnostic and should be integrated into any web application by adapting

    the request handling to extract necessary components.

    Example:

    # Extract necessary components from a Flask or Django request and pass them to this function.

    result = authenticate_saml(request.scheme, request.host, request.url, request.method, request.args, request.form,

                               handle_success, handle_failure)

    """

    # Prepare request data for SAML auth

    url_data = urlparse(url)

    saml_request = {

        "https": "on" if scheme == "https" else "off",

        "http_host": host,

        "server_port": url_data.port,

        "script_name": url_data.path,

        "get_data": args,

        "post_data": form,

        "query_string": urlencode(args) if method == "GET" else "",

    }

    # Initialize SAML auth

    saml_path = saml_path or ce("SAML_PATH")

    auth = OneLogin_Saml2_Auth(saml_request, custom_base_path=saml_path)

    # SAML Action Handling

    try:

        if "sso" in args:

            return process_success(auth.login())

        elif "slo" in args:

            return process_success(auth.logout())

        elif "acs" in args:

            auth.process_response(

                request_id=None

            )  # Assuming request carries all needed info

            if auth.is_authenticated():

                return process_success(None)  # pass user details / attributes

            else:

                return process_failure("Authentication failed or errors occurred")

        else:

            return process_failure("No SAML action found")

    except Exception as e:

        return process_failure(str(e))