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"""Initialise the OAuth2 Server"""
import uuid
import datetime
from typing import Callable
from flask import Flask, current_app
from authlib.oauth2.rfc7523 import JWTBearerTokenValidator
from authlib.oauth2.rfc6749.errors import InvalidClientError
from authlib.integrations.flask_oauth2 import AuthorizationServer
from gn_auth.auth.db import sqlite3 as db
from .models.oauth2client import client
from .models.oauth2token import OAuth2Token, save_token
from .grants.password_grant import PasswordGrant
from .grants.authorisation_code_grant import AuthorisationCodeGrant
from .grants.jwt_bearer_grant import JWTBearerGrant, JWTBearerTokenGenerator
from .endpoints.revocation import RevocationEndpoint
from .endpoints.introspection import IntrospectionEndpoint
from .resource_server import require_oauth, BearerTokenValidator
def create_query_client_func() -> Callable:
"""Create the function that loads the client."""
def __query_client__(client_id: uuid.UUID):
# use current_app rather than passing the db_uri to avoid issues
# when config changes, e.g. while testing.
with db.connection(current_app.config["AUTH_DB"]) as conn:
_client = client(conn, client_id).maybe(
None, lambda clt: clt) # type: ignore[misc]
if bool(_client):
return _client
raise InvalidClientError(
"No client found for the given CLIENT_ID and CLIENT_SECRET.")
return __query_client__
def create_save_token_func(token_model: type) -> Callable:
"""Create the function that saves the token."""
def __save_token__(token, request):
with db.connection(current_app.config["AUTH_DB"]) as conn:
save_token(
conn, token_model(
token_id=uuid.uuid4(), client=request.client,
user=request.user,
**{
"refresh_token": None, "revoked": False,
"issued_at": datetime.datetime.now(),
**token
}))
return __save_token__
def setup_oauth2_server(app: Flask) -> None:
"""Set's up the oauth2 server for the flask application."""
server = AuthorizationServer()
server.register_grant(PasswordGrant)
# Figure out a common `code_verifier` for GN2 and GN3 and set
# server.register_grant(AuthorisationCodeGrant, [CodeChallenge(required=False)])
# below
server.register_grant(AuthorisationCodeGrant)
server.register_grant(JWTBearerGrant)
server.register_token_generator(
"urn:ietf:params:oauth:grant-type:jwt-bearer",
JWTBearerTokenGenerator(app.config["SSL_PRIVATE_KEY"]))
# register endpoints
server.register_endpoint(RevocationEndpoint)
server.register_endpoint(IntrospectionEndpoint)
# init server
server.init_app(
app,
query_client=create_query_client_func(),
save_token=create_save_token_func(OAuth2Token))
app.config["OAUTH2_SERVER"] = server
## Set up the token validators
require_oauth.register_token_validator(BearerTokenValidator())
require_oauth.register_token_validator(
JWTBearerTokenValidator(app.config["SSL_PRIVATE_KEY"].get_public_key()))
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