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"""Base Tornado handlers for the notebook.
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Authors:
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* Brian Granger
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import datetime
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import email.utils
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import hashlib
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import logging
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import mimetypes
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import os
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import re
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import stat
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import threading
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from tornado import web
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from tornado import websocket
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try:
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from tornado.log import app_log
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except ImportError:
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app_log = logging.getLogger()
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from IPython.config import Application
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from IPython.external.decorator import decorator
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from IPython.utils.path import filefind
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#-----------------------------------------------------------------------------
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# Monkeypatch for Tornado <= 2.1.1 - Remove when no longer necessary!
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#-----------------------------------------------------------------------------
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# Google Chrome, as of release 16, changed its websocket protocol number. The
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# parts tornado cares about haven't really changed, so it's OK to continue
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# accepting Chrome connections, but as of Tornado 2.1.1 (the currently released
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# version as of Oct 30/2011) the version check fails, see the issue report:
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# https://github.com/facebook/tornado/issues/385
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# This issue has been fixed in Tornado post 2.1.1:
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# https://github.com/facebook/tornado/commit/84d7b458f956727c3b0d6710
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# Here we manually apply the same patch as above so that users of IPython can
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# continue to work with an officially released Tornado. We make the
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# monkeypatch version check as narrow as possible to limit its effects; once
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# Tornado 2.1.1 is no longer found in the wild we'll delete this code.
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import tornado
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if tornado.version_info <= (2,1,1):
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def _execute(self, transforms, *args, **kwargs):
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from tornado.websocket import WebSocketProtocol8, WebSocketProtocol76
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self.open_args = args
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self.open_kwargs = kwargs
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# The difference between version 8 and 13 is that in 8 the
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# client sends a "Sec-Websocket-Origin" header and in 13 it's
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# simply "Origin".
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if self.request.headers.get("Sec-WebSocket-Version") in ("7", "8", "13"):
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self.ws_connection = WebSocketProtocol8(self)
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self.ws_connection.accept_connection()
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elif self.request.headers.get("Sec-WebSocket-Version"):
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self.stream.write(tornado.escape.utf8(
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"HTTP/1.1 426 Upgrade Required\r\n"
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"Sec-WebSocket-Version: 8\r\n\r\n"))
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self.stream.close()
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else:
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self.ws_connection = WebSocketProtocol76(self)
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self.ws_connection.accept_connection()
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websocket.WebSocketHandler._execute = _execute
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del _execute
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#-----------------------------------------------------------------------------
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# Top-level handlers
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#-----------------------------------------------------------------------------
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non_alphanum = re.compile(r'[^A-Za-z0-9]')
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class RequestHandler(web.RequestHandler):
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"""RequestHandler with default variable setting."""
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def render(*args, **kwargs):
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kwargs.setdefault('message', '')
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return web.RequestHandler.render(*args, **kwargs)
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class AuthenticatedHandler(RequestHandler):
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"""A RequestHandler with an authenticated user."""
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def clear_login_cookie(self):
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self.clear_cookie(self.cookie_name)
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def get_current_user(self):
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user_id = self.get_secure_cookie(self.cookie_name)
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# For now the user_id should not return empty, but it could eventually
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if user_id == '':
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user_id = 'anonymous'
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if user_id is None:
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# prevent extra Invalid cookie sig warnings:
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self.clear_login_cookie()
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if not self.login_available:
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user_id = 'anonymous'
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return user_id
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@property
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def cookie_name(self):
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default_cookie_name = non_alphanum.sub('-', 'username-{}'.format(
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self.request.host
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))
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return self.settings.get('cookie_name', default_cookie_name)
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@property
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def password(self):
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"""our password"""
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return self.settings.get('password', '')
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@property
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def logged_in(self):
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"""Is a user currently logged in?
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"""
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user = self.get_current_user()
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return (user and not user == 'anonymous')
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@property
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def login_available(self):
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"""May a user proceed to log in?
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This returns True if login capability is available, irrespective of
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whether the user is already logged in or not.
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"""
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return bool(self.settings.get('password', ''))
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class IPythonHandler(AuthenticatedHandler):
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"""IPython-specific extensions to authenticated handling
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Mostly property shortcuts to IPython-specific settings.
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"""
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@property
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def config(self):
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return self.settings.get('config', None)
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@property
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def log(self):
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"""use the IPython log by default, falling back on tornado's logger"""
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if Application.initialized():
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return Application.instance().log
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else:
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return app_log
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@property
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def use_less(self):
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"""Use less instead of css in templates"""
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return self.settings.get('use_less', False)
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#---------------------------------------------------------------
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# URLs
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#---------------------------------------------------------------
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@property
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def ws_url(self):
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"""websocket url matching the current request
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By default, this is just `''`, indicating that it should match
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the same host, protocol, port, etc.
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"""
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return self.settings.get('websocket_url', '')
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@property
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def mathjax_url(self):
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return self.settings.get('mathjax_url', '')
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@property
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def base_project_url(self):
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return self.settings.get('base_project_url', '/')
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@property
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def base_kernel_url(self):
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return self.settings.get('base_kernel_url', '/')
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#---------------------------------------------------------------
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# Manager objects
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#---------------------------------------------------------------
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@property
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def kernel_manager(self):
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return self.settings['kernel_manager']
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@property
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def notebook_manager(self):
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return self.settings['notebook_manager']
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@property
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def cluster_manager(self):
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return self.settings['cluster_manager']
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@property
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def project(self):
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return self.notebook_manager.notebook_dir
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#---------------------------------------------------------------
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# template rendering
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#---------------------------------------------------------------
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def get_template(self, name):
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"""Return the jinja template object for a given name"""
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return self.settings['jinja2_env'].get_template(name)
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def render_template(self, name, **ns):
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ns.update(self.template_namespace)
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template = self.get_template(name)
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return template.render(**ns)
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@property
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def template_namespace(self):
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return dict(
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base_project_url=self.base_project_url,
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base_kernel_url=self.base_kernel_url,
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logged_in=self.logged_in,
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login_available=self.login_available,
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use_less=self.use_less,
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)
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class AuthenticatedFileHandler(IPythonHandler, web.StaticFileHandler):
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"""static files should only be accessible when logged in"""
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@web.authenticated
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def get(self, path):
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return web.StaticFileHandler.get(self, path)
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#-----------------------------------------------------------------------------
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# File handler
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#-----------------------------------------------------------------------------
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# to minimize subclass changes:
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HTTPError = web.HTTPError
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class FileFindHandler(web.StaticFileHandler):
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"""subclass of StaticFileHandler for serving files from a search path"""
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_static_paths = {}
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# _lock is needed for tornado < 2.2.0 compat
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_lock = threading.Lock() # protects _static_hashes
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def initialize(self, path, default_filename=None):
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if isinstance(path, basestring):
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path = [path]
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self.roots = tuple(
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os.path.abspath(os.path.expanduser(p)) + os.path.sep for p in path
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)
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self.default_filename = default_filename
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@classmethod
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def locate_file(cls, path, roots):
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"""locate a file to serve on our static file search path"""
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with cls._lock:
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if path in cls._static_paths:
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return cls._static_paths[path]
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try:
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abspath = os.path.abspath(filefind(path, roots))
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except IOError:
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# empty string should always give exists=False
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return ''
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# os.path.abspath strips a trailing /
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# it needs to be temporarily added back for requests to root/
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if not (abspath + os.path.sep).startswith(roots):
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raise HTTPError(403, "%s is not in root static directory", path)
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cls._static_paths[path] = abspath
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return abspath
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def get(self, path, include_body=True):
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path = self.parse_url_path(path)
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# begin subclass override
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abspath = self.locate_file(path, self.roots)
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# end subclass override
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if os.path.isdir(abspath) and self.default_filename is not None:
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# need to look at the request.path here for when path is empty
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# but there is some prefix to the path that was already
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# trimmed by the routing
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if not self.request.path.endswith("/"):
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self.redirect(self.request.path + "/")
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return
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abspath = os.path.join(abspath, self.default_filename)
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if not os.path.exists(abspath):
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raise HTTPError(404)
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if not os.path.isfile(abspath):
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raise HTTPError(403, "%s is not a file", path)
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stat_result = os.stat(abspath)
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modified = datetime.datetime.utcfromtimestamp(stat_result[stat.ST_MTIME])
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self.set_header("Last-Modified", modified)
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mime_type, encoding = mimetypes.guess_type(abspath)
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if mime_type:
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self.set_header("Content-Type", mime_type)
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cache_time = self.get_cache_time(path, modified, mime_type)
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if cache_time > 0:
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self.set_header("Expires", datetime.datetime.utcnow() + \
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datetime.timedelta(seconds=cache_time))
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self.set_header("Cache-Control", "max-age=" + str(cache_time))
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else:
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self.set_header("Cache-Control", "public")
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self.set_extra_headers(path)
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# Check the If-Modified-Since, and don't send the result if the
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# content has not been modified
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ims_value = self.request.headers.get("If-Modified-Since")
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if ims_value is not None:
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date_tuple = email.utils.parsedate(ims_value)
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if_since = datetime.datetime(*date_tuple[:6])
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if if_since >= modified:
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self.set_status(304)
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return
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with open(abspath, "rb") as file:
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data = file.read()
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hasher = hashlib.sha1()
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hasher.update(data)
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self.set_header("Etag", '"%s"' % hasher.hexdigest())
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if include_body:
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self.write(data)
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else:
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assert self.request.method == "HEAD"
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self.set_header("Content-Length", len(data))
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@classmethod
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def get_version(cls, settings, path):
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"""Generate the version string to be used in static URLs.
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This method may be overridden in subclasses (but note that it
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is a class method rather than a static method). The default
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implementation uses a hash of the file's contents.
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``settings`` is the `Application.settings` dictionary and ``path``
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is the relative location of the requested asset on the filesystem.
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The returned value should be a string, or ``None`` if no version
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could be determined.
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"""
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# begin subclass override:
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static_paths = settings['static_path']
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if isinstance(static_paths, basestring):
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static_paths = [static_paths]
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roots = tuple(
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os.path.abspath(os.path.expanduser(p)) + os.path.sep for p in static_paths
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)
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try:
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abs_path = filefind(path, roots)
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except IOError:
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app_log.error("Could not find static file %r", path)
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return None
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# end subclass override
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with cls._lock:
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hashes = cls._static_hashes
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if abs_path not in hashes:
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try:
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f = open(abs_path, "rb")
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hashes[abs_path] = hashlib.md5(f.read()).hexdigest()
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f.close()
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except Exception:
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app_log.error("Could not open static file %r", path)
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hashes[abs_path] = None
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hsh = hashes.get(abs_path)
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if hsh:
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return hsh[:5]
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return None
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def parse_url_path(self, url_path):
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"""Converts a static URL path into a filesystem path.
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``url_path`` is the path component of the URL with
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``static_url_prefix`` removed. The return value should be
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filesystem path relative to ``static_path``.
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"""
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if os.path.sep != "/":
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url_path = url_path.replace("/", os.path.sep)
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return url_path
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#-----------------------------------------------------------------------------
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# URL to handler mappings
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#-----------------------------------------------------------------------------
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default_handlers = []
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