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"""Common oauth2 client utilities."""
import uuid
import json
import requests
from typing import Any, Optional
from urllib.parse import urljoin
from flask import jsonify, current_app as app
from pymonad.maybe import Just, Maybe, Nothing
from pymonad.either import Left, Right, Either
from authlib.integrations.requests_client import OAuth2Session
from gn2.wqflask.oauth2 import session
from gn2.wqflask.external_errors import ExternalRequestError
SCOPE = ("profile group role resource register-client user masquerade "
"introspect migrate-data")
def authserver_uri():
"""Return URI to authorisation server."""
return app.config["AUTH_SERVER_URL"]
def oauth2_clientid():
"""Return the client id."""
return app.config["OAUTH2_CLIENT_ID"]
def oauth2_clientsecret():
"""Return the client secret."""
return app.config["OAUTH2_CLIENT_SECRET"]
def user_logged_in():
"""Check whether the user has logged in."""
suser = session.session_info()["user"]
if suser["logged_in"]:
if session.expired():
session.clear_session_info()
return False
return suser["token"].is_right()
return False
def oauth2_client():
def __client__(token) -> OAuth2Session:
return OAuth2Session(
oauth2_clientid(), oauth2_clientsecret(),
scope=SCOPE, token_endpoint_auth_method="client_secret_post",
token=token)
return session.user_token().either(
lambda _notok: __client__(None),
lambda token: __client__(token))
def __no_token__(_err) -> Left:
"""Handle situation where request is attempted with no token."""
resp = requests.models.Response()
resp._content = json.dumps({
"error": "AuthenticationError",
"error-description": ("You need to authenticate to access requested "
"information.")}).encode("utf-8")
resp.status_code = 400
return Left(resp)
def oauth2_get(uri_path: str, data: dict = {}, **kwargs) -> Either:
def __get__(token) -> Either:
client = OAuth2Session(
oauth2_clientid(), oauth2_clientsecret(),
token=token, scope=SCOPE)
resp = client.get(
urljoin(authserver_uri(), uri_path),
data=data,
**kwargs)
if resp.status_code == 200:
return Right(resp.json())
return Left(resp)
return session.user_token().either(__no_token__, __get__)
def oauth2_post(
uri_path: str, data: Optional[dict] = None, json: Optional[dict] = None,
**kwargs) -> Either:
def __post__(token) -> Either:
client = OAuth2Session(
oauth2_clientid(), oauth2_clientsecret(),
token=token, scope=SCOPE)
resp = client.post(
urljoin(authserver_uri(), uri_path), data=data, json=json,
**kwargs)
if resp.status_code == 200:
return Right(resp.json())
return Left(resp)
return session.user_token().either(__no_token__, __post__)
def no_token_get(uri_path: str, **kwargs) -> Either:
uri = urljoin(authserver_uri(), uri_path)
try:
resp = requests.get(uri, **kwargs)
if resp.status_code == 200:
return Right(resp.json())
return Left(resp)
except requests.exceptions.RequestException as exc:
raise ExternalRequestError(uri, exc) from exc
def no_token_post(uri_path: str, **kwargs) -> Either:
data = kwargs.get("data", {})
the_json = kwargs.get("json", {})
request_data = {
**data,
**the_json,
"client_id": oauth2_clientid(),
"client_secret": oauth2_clientsecret()
}
new_kwargs = {
**{
key: value for key, value in kwargs.items()
if key not in ("data", "json")
},
("data" if bool(data) else "json"): request_data
}
try:
resp = requests.post(urljoin(authserver_uri(), uri_path),
**new_kwargs)
if resp.status_code == 200:
return Right(resp.json())
return Left(resp)
except requests.exceptions.RequestException as exc:
raise ExternalRequestError(uri, exc) from exc
def post(uri_path: str, **kwargs) -> Either:
"""
Generic function to do POST requests, that checks whether or not the user is
logged in and selects the appropriate function/method to run.
"""
if user_logged_in():
return oauth2_post(uri_path, **kwargs)
return no_token_post(uri_path, **kwargs)
def get(uri_path: str, **kwargs) -> Either:
"""
Generic function to do GET requests, that checks whether or not the user is
logged in and selects the appropriate function/method to run.
"""
if user_logged_in():
return oauth2_get(uri_path, **kwargs)
return no_token_get(uri_path, **kwargs)
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