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"""Classes and function for Authorisation Code flow."""
import uuid
import string
import random
from typing import Optional
from datetime import datetime
from flask import current_app as app
from authlib.oauth2.rfc6749 import grants
from authlib.oauth2.rfc7636 import create_s256_code_challenge
from gn_auth.auth.db import sqlite3 as db
from gn_auth.auth.db.sqlite3 import with_db_connection
from gn_auth.auth.authentication.users import User
from ..models.oauth2client import OAuth2Client
from ..models.authorization_code import (
AuthorisationCode, authorisation_code, save_authorisation_code)
class AuthorisationCodeGrant(grants.AuthorizationCodeGrant):
"""Implement the 'Authorisation Code' grant."""
TOKEN_ENDPOINT_AUTH_METHODS: list[str] = [
"client_secret_basic", "client_secret_post"]
AUTHORIZATION_CODE_LENGTH: int = 48
TOKEN_ENDPOINT_HTTP_METHODS = ['POST']
GRANT_TYPE = "authorization_code"
RESPONSE_TYPES = {'code'}
def save_authorization_code(self, code, request):
"""Persist the authorisation code to database."""
client = request.client
nonce = "".join(random.sample(string.ascii_letters + string.digits,
k=self.AUTHORIZATION_CODE_LENGTH))
return __save_authorization_code__(
AuthorisationCode(
code_id=uuid.uuid4(),
code=code,
client=client,
redirect_uri=request.redirect_uri,
scope=request.scope,
nonce=nonce,
auth_time=int(datetime.now().timestamp()),
code_challenge=create_s256_code_challenge(
app.config["SECRET_KEY"]
),
code_challenge_method="S256",
user=request.user)
)
def query_authorization_code(self, code, client):
"""Retrieve the code from the database."""
return __query_authorization_code__(code, client)
def delete_authorization_code(self, authorization_code):# pylint: disable=[no-self-use]
"""Delete the authorisation code."""
with db.connection(app.config["AUTH_DB"]) as conn:
with db.cursor(conn) as cursor:
cursor.execute(
"DELETE FROM authorisation_code WHERE code_id=?",
(str(authorization_code.code_id),))
def authenticate_user(self, authorization_code) -> Optional[User]:
"""Authenticate the user who own the authorisation code."""
query = (
"SELECT users.* FROM authorisation_code LEFT JOIN users "
"ON authorisation_code.user_id=users.user_id "
"WHERE authorisation_code.code=?")
with db.connection(app.config["AUTH_DB"]) as conn:
with db.cursor(conn) as cursor:
cursor.execute(query, (str(authorization_code.code),))
res = cursor.fetchone()
if res:
return User(
uuid.UUID(res["user_id"]), res["email"], res["name"])
return None
def __query_authorization_code__(
code: str, client: OAuth2Client) -> AuthorisationCode:
"""A helper function that creates a new database connection.
This is found to be necessary since the `AuthorizationCodeGrant` class(es)
do not have a way to pass the database connection."""
def __auth_code__(conn) -> str:
_code = authorisation_code(conn, code, client)
# type: ignore[misc, arg-type, return-value]
return _code.maybe(None, lambda cde: cde)
return with_db_connection(__auth_code__)
def __save_authorization_code__(code: AuthorisationCode) -> AuthorisationCode:
"""A helper function that creates a new database connection.
This is found to be necessary since the `AuthorizationCodeGrant` class(es)
do not have a way to pass the database connection."""
return with_db_connection(lambda conn: save_authorisation_code(conn, code))
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