You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.7 KiB
53 lines
1.7 KiB
3 years ago
|
import typing
|
||
|
|
|
||
|
|
from starlette.authentication import (
|
||
|
|
AuthCredentials,
|
||
|
|
AuthenticationBackend,
|
||
|
|
AuthenticationError,
|
||
|
|
UnauthenticatedUser,
|
||
|
|
)
|
||
|
|
from starlette.requests import HTTPConnection
|
||
|
|
from starlette.responses import PlainTextResponse, Response
|
||
|
|
from starlette.types import ASGIApp, Receive, Scope, Send
|
||
|
|
|
||
|
|
|
||
|
|
class AuthenticationMiddleware:
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
app: ASGIApp,
|
||
|
|
backend: AuthenticationBackend,
|
||
|
|
on_error: typing.Callable[
|
||
|
|
[HTTPConnection, AuthenticationError], Response
|
||
|
|
] = None,
|
||
|
|
) -> None:
|
||
|
|
self.app = app
|
||
|
|
self.backend = backend
|
||
|
|
self.on_error: typing.Callable[
|
||
|
|
[HTTPConnection, AuthenticationError], Response
|
||
|
|
] = (on_error if on_error is not None else self.default_on_error)
|
||
|
|
|
||
|
|
async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
|
||
|
|
if scope["type"] not in ["http", "websocket"]:
|
||
|
|
await self.app(scope, receive, send)
|
||
|
|
return
|
||
|
|
|
||
|
|
conn = HTTPConnection(scope)
|
||
|
|
try:
|
||
|
|
auth_result = await self.backend.authenticate(conn)
|
||
|
|
except AuthenticationError as exc:
|
||
|
|
response = self.on_error(conn, exc)
|
||
|
|
if scope["type"] == "websocket":
|
||
|
|
await send({"type": "websocket.close", "code": 1000})
|
||
|
|
else:
|
||
|
|
await response(scope, receive, send)
|
||
|
|
return
|
||
|
|
|
||
|
|
if auth_result is None:
|
||
|
|
auth_result = AuthCredentials(), UnauthenticatedUser()
|
||
|
|
scope["auth"], scope["user"] = auth_result
|
||
|
|
await self.app(scope, receive, send)
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def default_on_error(conn: HTTPConnection, exc: Exception) -> Response:
|
||
|
|
return PlainTextResponse(str(exc), status_code=400)
|