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# Copyright (c) 2020 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.
import threading
from typing import Any, Callable, Optional, TYPE_CHECKING
from UM.Logger import Logger
got_server_type = False
try:
from cura.OAuth2.AuthorizationRequestServer import AuthorizationRequestServer
from cura.OAuth2.AuthorizationRequestHandler import AuthorizationRequestHandler
got_server_type = True
except PermissionError: # Bug in http.server: Can't access MIME types. This will prevent the user from logging in. See Sentry bug Cura-3Q.
Logger.error("Can't start a server due to a PermissionError when starting the http.server.")
if TYPE_CHECKING:
from cura.OAuth2.Models import AuthenticationResponse
from cura.OAuth2.AuthorizationHelpers import AuthorizationHelpers
class LocalAuthorizationServer:
## The local LocalAuthorizationServer takes care of the oauth2 callbacks.
# Once the flow is completed, this server should be closed down again by
# calling stop()
# \param auth_helpers An instance of the authorization helpers class.
# \param auth_state_changed_callback A callback function to be called when
# the authorization state changes.
# \param daemon Whether the server thread should be run in daemon mode.
# Note: Daemon threads are abruptly stopped at shutdown. Their resources
# (e.g. open files) may never be released.
def __init__(self, auth_helpers: "AuthorizationHelpers",
auth_state_changed_callback: Callable[["AuthenticationResponse"], Any],
daemon: bool) -> None:
self._web_server = None # type: Optional[AuthorizationRequestServer]
self._web_server_thread = None # type: Optional[threading.Thread]
self._web_server_port = auth_helpers.settings.CALLBACK_PORT
self._auth_helpers = auth_helpers
self._auth_state_changed_callback = auth_state_changed_callback
self._daemon = daemon
## Starts the local web server to handle the authorization callback.
# \param verification_code The verification code part of the OAuth2 client identification.
# \param state The unique state code (to ensure that the request we get back is really from the server.
def start(self, verification_code: str, state: str) -> None:
if self._web_server:
# If the server is already running (because of a previously aborted auth flow), we don't have to start it.
# We still inject the new verification code though.
self._web_server.setVerificationCode(verification_code)
return
if self._web_server_port is None:
raise Exception("Unable to start server without specifying the port.")
Logger.log("d", "Starting local web server to handle authorization callback on port %s", self._web_server_port)
# Create the server and inject the callback and code.
if got_server_type:
self._web_server = AuthorizationRequestServer(("0.0.0.0", self._web_server_port), AuthorizationRequestHandler)
self._web_server.setAuthorizationHelpers(self._auth_helpers)
self._web_server.setAuthorizationCallback(self._auth_state_changed_callback)
self._web_server.setVerificationCode(verification_code)
self._web_server.setState(state)
# Start the server on a new thread.
self._web_server_thread = threading.Thread(None, self._web_server.serve_forever, daemon = self._daemon)
self._web_server_thread.start()
## Stops the web server if it was running. It also does some cleanup.
def stop(self) -> None:
Logger.log("d", "Stopping local oauth2 web server...")
if self._web_server:
try:
self._web_server.server_close()
except OSError:
# OS error can happen if the socket was already closed. We really don't care about that case.
pass
self._web_server = None
self._web_server_thread = None
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