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245 lines
11 KiB
Python
245 lines
11 KiB
Python
# Copyright (c) 2019 Ultimaker B.V.
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# Cura is released under the terms of the LGPLv3 or higher.
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import json
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from datetime import datetime, timedelta
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from typing import Optional, TYPE_CHECKING
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from urllib.parse import urlencode
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import requests.exceptions
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from PyQt5.QtCore import QUrl
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from PyQt5.QtGui import QDesktopServices
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from UM.Logger import Logger
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from UM.Message import Message
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from UM.Signal import Signal
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from UM.i18n import i18nCatalog
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from cura.OAuth2.AuthorizationHelpers import AuthorizationHelpers, TOKEN_TIMESTAMP_FORMAT
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from cura.OAuth2.LocalAuthorizationServer import LocalAuthorizationServer
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from cura.OAuth2.Models import AuthenticationResponse
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i18n_catalog = i18nCatalog("cura")
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if TYPE_CHECKING:
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from cura.OAuth2.Models import UserProfile, OAuth2Settings
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from UM.Preferences import Preferences
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class AuthorizationService:
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"""The authorization service is responsible for handling the login flow, storing user credentials and providing
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account information.
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"""
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# Emit signal when authentication is completed.
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onAuthStateChanged = Signal()
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# Emit signal when authentication failed.
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onAuthenticationError = Signal()
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accessTokenChanged = Signal()
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def __init__(self, settings: "OAuth2Settings", preferences: Optional["Preferences"] = None) -> None:
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self._settings = settings
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self._auth_helpers = AuthorizationHelpers(settings)
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self._auth_url = "{}/authorize".format(self._settings.OAUTH_SERVER_URL)
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self._auth_data = None # type: Optional[AuthenticationResponse]
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self._user_profile = None # type: Optional["UserProfile"]
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self._preferences = preferences
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self._server = LocalAuthorizationServer(self._auth_helpers, self._onAuthStateChanged, daemon=True)
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self._unable_to_get_data_message = None # type: Optional[Message]
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self.onAuthStateChanged.connect(self._authChanged)
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def _authChanged(self, logged_in):
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if logged_in and self._unable_to_get_data_message is not None:
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self._unable_to_get_data_message.hide()
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def initialize(self, preferences: Optional["Preferences"] = None) -> None:
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if preferences is not None:
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self._preferences = preferences
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if self._preferences:
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self._preferences.addPreference(self._settings.AUTH_DATA_PREFERENCE_KEY, "{}")
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def getUserProfile(self) -> Optional["UserProfile"]:
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"""Get the user profile as obtained from the JWT (JSON Web Token).
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If the JWT is not yet parsed, calling this will take care of that.
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:return: UserProfile if a user is logged in, None otherwise.
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See also: :py:method:`cura.OAuth2.AuthorizationService.AuthorizationService._parseJWT`
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"""
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if not self._user_profile:
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# If no user profile was stored locally, we try to get it from JWT.
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try:
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self._user_profile = self._parseJWT()
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except requests.exceptions.ConnectionError:
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# Unable to get connection, can't login.
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Logger.logException("w", "Unable to validate user data with the remote server.")
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return None
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if not self._user_profile and self._auth_data:
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# If there is still no user profile from the JWT, we have to log in again.
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Logger.log("w", "The user profile could not be loaded. The user must log in again!")
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self.deleteAuthData()
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return None
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return self._user_profile
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def _parseJWT(self) -> Optional["UserProfile"]:
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"""Tries to parse the JWT (JSON Web Token) data, which it does if all the needed data is there.
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:return: UserProfile if it was able to parse, None otherwise.
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"""
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if not self._auth_data or self._auth_data.access_token is None:
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# If no auth data exists, we should always log in again.
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Logger.log("d", "There was no auth data or access token")
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return None
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user_data = self._auth_helpers.parseJWT(self._auth_data.access_token)
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if user_data:
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# If the profile was found, we return it immediately.
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return user_data
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# The JWT was expired or invalid and we should request a new one.
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if self._auth_data.refresh_token is None:
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Logger.log("w", "There was no refresh token in the auth data.")
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return None
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self._auth_data = self._auth_helpers.getAccessTokenUsingRefreshToken(self._auth_data.refresh_token)
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if not self._auth_data or self._auth_data.access_token is None:
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Logger.log("w", "Unable to use the refresh token to get a new access token.")
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# The token could not be refreshed using the refresh token. We should login again.
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return None
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# Ensure it gets stored as otherwise we only have it in memory. The stored refresh token has been deleted
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# from the server already.
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self._storeAuthData(self._auth_data)
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return self._auth_helpers.parseJWT(self._auth_data.access_token)
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def getAccessToken(self) -> Optional[str]:
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"""Get the access token as provided by the repsonse data."""
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if self._auth_data is None:
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Logger.log("d", "No auth data to retrieve the access_token from")
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return None
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# Check if the current access token is expired and refresh it if that is the case.
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# We have a fallback on a date far in the past for currently stored auth data in cura.cfg.
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received_at = datetime.strptime(self._auth_data.received_at, TOKEN_TIMESTAMP_FORMAT) \
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if self._auth_data.received_at else datetime(2000, 1, 1)
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expiry_date = received_at + timedelta(seconds = float(self._auth_data.expires_in or 0) - 60)
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if datetime.now() > expiry_date:
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self.refreshAccessToken()
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return self._auth_data.access_token if self._auth_data else None
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def refreshAccessToken(self) -> None:
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"""Try to refresh the access token. This should be used when it has expired."""
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if self._auth_data is None or self._auth_data.refresh_token is None:
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Logger.log("w", "Unable to refresh access token, since there is no refresh token.")
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return
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response = self._auth_helpers.getAccessTokenUsingRefreshToken(self._auth_data.refresh_token)
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if response.success:
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self._storeAuthData(response)
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self.onAuthStateChanged.emit(logged_in = True)
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else:
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Logger.log("w", "Failed to get a new access token from the server.")
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self.onAuthStateChanged.emit(logged_in = False)
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def deleteAuthData(self) -> None:
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"""Delete the authentication data that we have stored locally (eg; logout)"""
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if self._auth_data is not None:
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self._storeAuthData()
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self.onAuthStateChanged.emit(logged_in = False)
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def startAuthorizationFlow(self) -> None:
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"""Start the flow to become authenticated. This will start a new webbrowser tap, prompting the user to login."""
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Logger.log("d", "Starting new OAuth2 flow...")
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# Create the tokens needed for the code challenge (PKCE) extension for OAuth2.
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# This is needed because the CuraDrivePlugin is a untrusted (open source) client.
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# More details can be found at https://tools.ietf.org/html/rfc7636.
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verification_code = self._auth_helpers.generateVerificationCode()
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challenge_code = self._auth_helpers.generateVerificationCodeChallenge(verification_code)
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state = AuthorizationHelpers.generateVerificationCode()
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# Create the query string needed for the OAuth2 flow.
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query_string = urlencode({
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"client_id": self._settings.CLIENT_ID,
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"redirect_uri": self._settings.CALLBACK_URL,
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"scope": self._settings.CLIENT_SCOPES,
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"response_type": "code",
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"state": state, # Forever in our Hearts, RIP "(.Y.)" (2018-2020)
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"code_challenge": challenge_code,
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"code_challenge_method": "S512"
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})
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# Start a local web server to receive the callback URL on.
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try:
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self._server.start(verification_code, state)
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except OSError:
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Logger.logException("w", "Unable to create authorization request server")
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Message(i18n_catalog.i18nc("@info", "Unable to start a new sign in process. Check if another sign in attempt is still active."),
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title=i18n_catalog.i18nc("@info:title", "Warning")).show()
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return
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# Open the authorization page in a new browser window.
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QDesktopServices.openUrl(QUrl("{}?{}".format(self._auth_url, query_string)))
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def _onAuthStateChanged(self, auth_response: AuthenticationResponse) -> None:
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"""Callback method for the authentication flow."""
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if auth_response.success:
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self._storeAuthData(auth_response)
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self.onAuthStateChanged.emit(logged_in = True)
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else:
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self.onAuthenticationError.emit(logged_in = False, error_message = auth_response.err_message)
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self._server.stop() # Stop the web server at all times.
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def loadAuthDataFromPreferences(self) -> None:
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"""Load authentication data from preferences."""
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if self._preferences is None:
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Logger.log("e", "Unable to load authentication data, since no preference has been set!")
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return
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try:
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preferences_data = json.loads(self._preferences.getValue(self._settings.AUTH_DATA_PREFERENCE_KEY))
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if preferences_data:
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self._auth_data = AuthenticationResponse(**preferences_data)
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# Also check if we can actually get the user profile information.
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user_profile = self.getUserProfile()
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if user_profile is not None:
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self.onAuthStateChanged.emit(logged_in = True)
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else:
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if self._unable_to_get_data_message is not None:
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self._unable_to_get_data_message.hide()
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self._unable_to_get_data_message = Message(i18n_catalog.i18nc("@info", "Unable to reach the Ultimaker account server."), title = i18n_catalog.i18nc("@info:title", "Warning"))
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self._unable_to_get_data_message.show()
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except ValueError:
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Logger.logException("w", "Could not load auth data from preferences")
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def _storeAuthData(self, auth_data: Optional[AuthenticationResponse] = None) -> None:
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"""Store authentication data in preferences."""
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Logger.log("d", "Attempting to store the auth data")
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if self._preferences is None:
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Logger.log("e", "Unable to save authentication data, since no preference has been set!")
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return
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self._auth_data = auth_data
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if auth_data:
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self._user_profile = self.getUserProfile()
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self._preferences.setValue(self._settings.AUTH_DATA_PREFERENCE_KEY, json.dumps(vars(auth_data)))
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else:
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self._user_profile = None
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self._preferences.resetPreference(self._settings.AUTH_DATA_PREFERENCE_KEY)
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self.accessTokenChanged.emit()
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