Source code for bokeh.server.views.session_handler

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# Copyright (c) 2012 - 2022, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
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''' Abstract request handler that handles bokeh-session-id

'''

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# Boilerplate
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from __future__ import annotations

import logging # isort:skip
log = logging.getLogger(__name__)

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# Imports
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# Standard library imports
from typing import TYPE_CHECKING

# External imports
from tornado.httputil import HTTPServerRequest
from tornado.web import HTTPError, authenticated

# Bokeh imports
from bokeh.util.token import (
    check_token_signature,
    generate_jwt_token,
    generate_session_id,
    get_session_id,
)

# Bokeh imports
from .auth_request_handler import AuthRequestHandler

if TYPE_CHECKING:
    from ...core.types import ID
    from ..contexts import ApplicationContext
    from ..session import ServerSession
    from ..tornado import BokehTornado

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# Globals and constants
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__all__ = (
    'SessionHandler',
)

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# General API
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# Dev API
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[docs]class SessionHandler(AuthRequestHandler): ''' Implements a custom Tornado handler for document display page ''' application: BokehTornado request: HTTPServerRequest application_context: ApplicationContext bokeh_websocket_path: str def __init__(self, tornado_app: BokehTornado, *args, **kw) -> None: self.application_context = kw['application_context'] self.bokeh_websocket_path = kw['bokeh_websocket_path'] # Note: tornado_app is stored as self.application super().__init__(tornado_app, *args, **kw)
[docs] def initialize(self, *args, **kw): pass
@authenticated async def get_session(self) -> ServerSession: app = self.application token = self.get_argument("bokeh-token", default=None) session_id: ID | None = self.get_argument("bokeh-session-id", default=None) if 'Bokeh-Session-Id' in self.request.headers: if session_id is not None: log.debug("Server received session ID in request argument and header, expected only one") raise HTTPError(status_code=403, reason="session ID was provided as an argument and header") session_id = self.request.headers.get('Bokeh-Session-Id') if token is not None: if session_id is not None: log.debug("Server received both token and session ID, expected only one") raise HTTPError(status_code=403, reason="Both token and session ID were provided") session_id = get_session_id(token) elif session_id is None: if app.generate_session_ids: session_id = generate_session_id(secret_key=app.secret_key, signed=app.sign_sessions) else: log.debug("Server configured not to generate session IDs and none was provided") raise HTTPError(status_code=403, reason="No bokeh-session-id provided") if token is None: if app.include_headers is None: excluded_headers = (app.exclude_headers or []) allowed_headers = [header for header in self.request.headers if header not in excluded_headers] else: allowed_headers = app.include_headers headers = {k: v for k, v in self.request.headers.items() if k in allowed_headers} if app.include_cookies is None: excluded_cookies = (app.exclude_cookies or []) allowed_cookies = [cookie for cookie in self.request.cookies if cookie not in excluded_cookies] else: allowed_cookies = app.include_cookies cookies = {k: v.value for k, v in self.request.cookies.items() if k in allowed_cookies} if cookies and 'Cookie' in headers and 'Cookie' not in (app.include_headers or []): # Do not include Cookie header since cookies can be restored from cookies dict del headers['Cookie'] arguments = {} if self.request.arguments is None else self.request.arguments payload = {'headers': headers, 'cookies': cookies, 'arguments': arguments} payload.update(self.application_context.application.process_request(self.request)) token = generate_jwt_token(session_id, secret_key=app.secret_key, signed=app.sign_sessions, expiration=app.session_token_expiration, extra_payload=payload) if not check_token_signature(token, secret_key=app.secret_key, signed=app.sign_sessions): log.error("Session id had invalid signature: %r", session_id) raise HTTPError(status_code=403, reason="Invalid token or session ID") session = await self.application_context.create_session_if_needed(session_id, self.request, token) return session
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