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import json
from collections import defaultdict
from typing import ClassVar
from unittest.mock import patch
from authlib.common.security import generate_token as generate_random_token
from authlib.oauth2 import AuthorizationServer as BaseAuthorizationServer
from authlib.oauth2 import OAuth2Request
from authlib.oauth2.rfc6749 import AuthorizationCodeGrant as BaseAuthorizationCodeGrant
from authlib.oauth2.rfc6749 import OAuth2Payload
from authlib.oauth2.rfc6749 import RefreshTokenGrant as BaseRefreshTokenGrant
from authlib.oauth2.rfc6750 import BearerTokenGenerator
from authlib.oauth2.rfc7636 import CodeChallenge
from fastapi import Request, Response
from sqlalchemy.exc import NoResultFound
from sqlmodel import select
from db.models import AuthCode, AuthToken, ClientApplication, User
from db.session import get_session_context
class AuthorizationCodeGrant(BaseAuthorizationCodeGrant):
TOKEN_ENDPOINT_AUTH_METHODS: ClassVar[list[str]] = [
"client_secret_basic",
"client_secret_post",
"none",
]
def save_authorization_code(self, code: str, request: OAuth2Request):
with get_session_context() as db_session:
db_session.add(request.user)
code_challenge = request.payload.data.get("code_challenge")
code_challenge_method = request.payload.data.get("code_challenge_method")
auth_code = AuthCode(
code=code,
client_id=request.client.client_id,
redirect_uri=request.payload.redirect_uri,
response_type=request.payload.response_type,
scope=request.payload.scope,
user_id=request.user.id,
code_challenge=code_challenge,
code_challenge_method=code_challenge_method,
)
db_session.add(auth_code)
return auth_code
def query_authorization_code(
self, code: str, client: ClientApplication
) -> AuthCode | None:
try:
with get_session_context() as db_session:
auth_code = db_session.exec(
select(AuthCode).where(
AuthCode.code == code, AuthCode.client_id == client.client_id
)
).one()
except NoResultFound:
return None
if auth_code.is_expired():
return None
return auth_code
def delete_authorization_code(self, code: AuthCode):
with get_session_context() as db_session:
db_session.delete(code)
def authenticate_user(self, authentication_code: AuthCode) -> User:
return authentication_code.user
class RefreshTokenGrant(BaseRefreshTokenGrant):
def authenticate_refresh_token(self, refresh_token) -> AuthToken | None:
try:
with get_session_context() as db_session:
token = db_session.exec(
select(AuthToken).where(AuthToken.refresh_token == refresh_token)
).one()
except NoResultFound:
return None
if not token.is_refresh_token_active():
return None
return token
def authenticate_user(self, credential: AuthToken):
return credential.user
def revoke_old_credential(self, credential: AuthToken):
with get_session_context() as db_session:
credential.revoked = True
db_session.add(credential)
async def prepare_oauth_request(request: Request) -> Request:
async with request.form() as form:
request.state.form_data = dict(form)
return request
class FastApiOAuth2Payload(OAuth2Payload):
def __init__(self, request: Request):
self._request = request
@property
def data(self):
return {
**self._request.query_params,
**getattr(self._request.state, "form_data", {}),
}
@property
def datalist(self):
values = defaultdict(list)
for k in self.data:
values[k].extend([self.data[k]])
return values
class FastApiOAuth2Request(OAuth2Request):
def __init__(self, request: Request):
with patch("authlib.oauth2.rfc6749.errors.InsecureTransportError"):
super().__init__(
method=request.method,
uri=str(request.url),
headers=request.headers,
)
self.method = request.method
self.uri = str(request.url)
self.headers = request.headers
self.payload = FastApiOAuth2Payload(request)
self.user = request.user
self._request = request
@property
def args(self):
return self._request.query_params
@property
def form(self):
return getattr(self._request.state, "form_data", {})
class AuthorizationServer(BaseAuthorizationServer):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.register_grant(AuthorizationCodeGrant, extensions=[CodeChallenge()])
self.register_grant(RefreshTokenGrant)
self.register_token_generator(
"default",
BearerTokenGenerator(
access_token_generator=lambda *args, **kwargs: generate_random_token(
42
),
refresh_token_generator=lambda *args, **kwargs: generate_random_token(
48
),
),
)
def query_client(self, client_id: str) -> ClientApplication:
with get_session_context() as db_session:
return db_session.exec(
select(ClientApplication).where(
ClientApplication.client_id == client_id
)
).one()
def save_token(self, token: dict, request: OAuth2Request):
with get_session_context() as db_session:
db_session.add(
AuthToken(
user_id=request.user.id, client_id=request.client.client_id, **token
)
)
def create_oauth2_request(self, request: Request) -> OAuth2Request:
return FastApiOAuth2Request(request)
def handle_response(self, status, body, headers) -> Response:
return Response(
status_code=status,
content=json.dumps(body) if isinstance(body, dict) else body,
headers=dict(headers),
)
def send_signal(self, name, *args, **kwargs):
pass
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