|
|
"""Base Tornado handlers for the notebook server."""
|
|
|
|
|
|
# Copyright (c) IPython Development Team.
|
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
|
|
import functools
|
|
|
import json
|
|
|
import logging
|
|
|
import os
|
|
|
import re
|
|
|
import sys
|
|
|
import traceback
|
|
|
try:
|
|
|
# py3
|
|
|
from http.client import responses
|
|
|
except ImportError:
|
|
|
from httplib import responses
|
|
|
|
|
|
from jinja2 import TemplateNotFound
|
|
|
from tornado import web
|
|
|
|
|
|
try:
|
|
|
from tornado.log import app_log
|
|
|
except ImportError:
|
|
|
app_log = logging.getLogger()
|
|
|
|
|
|
import IPython
|
|
|
from IPython.utils.sysinfo import get_sys_info
|
|
|
|
|
|
from IPython.config import Application
|
|
|
from IPython.utils.path import filefind
|
|
|
from IPython.utils.py3compat import string_types
|
|
|
from IPython.html.utils import is_hidden, url_path_join, url_escape
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Top-level handlers
|
|
|
#-----------------------------------------------------------------------------
|
|
|
non_alphanum = re.compile(r'[^A-Za-z0-9]')
|
|
|
|
|
|
sys_info = json.dumps(get_sys_info())
|
|
|
|
|
|
class AuthenticatedHandler(web.RequestHandler):
|
|
|
"""A RequestHandler with an authenticated user."""
|
|
|
|
|
|
def set_default_headers(self):
|
|
|
headers = self.settings.get('headers', {})
|
|
|
|
|
|
if "X-Frame-Options" not in headers:
|
|
|
headers["X-Frame-Options"] = "SAMEORIGIN"
|
|
|
|
|
|
for header_name,value in headers.items() :
|
|
|
try:
|
|
|
self.set_header(header_name, value)
|
|
|
except Exception:
|
|
|
# tornado raise Exception (not a subclass)
|
|
|
# if method is unsupported (websocket and Access-Control-Allow-Origin
|
|
|
# for example, so just ignore)
|
|
|
pass
|
|
|
|
|
|
def clear_login_cookie(self):
|
|
|
self.clear_cookie(self.cookie_name)
|
|
|
|
|
|
def get_current_user(self):
|
|
|
user_id = self.get_secure_cookie(self.cookie_name)
|
|
|
# For now the user_id should not return empty, but it could eventually
|
|
|
if user_id == '':
|
|
|
user_id = 'anonymous'
|
|
|
if user_id is None:
|
|
|
# prevent extra Invalid cookie sig warnings:
|
|
|
self.clear_login_cookie()
|
|
|
if not self.login_available:
|
|
|
user_id = 'anonymous'
|
|
|
return user_id
|
|
|
|
|
|
@property
|
|
|
def cookie_name(self):
|
|
|
default_cookie_name = non_alphanum.sub('-', 'username-{}'.format(
|
|
|
self.request.host
|
|
|
))
|
|
|
return self.settings.get('cookie_name', default_cookie_name)
|
|
|
|
|
|
@property
|
|
|
def password(self):
|
|
|
"""our password"""
|
|
|
return self.settings.get('password', '')
|
|
|
|
|
|
@property
|
|
|
def logged_in(self):
|
|
|
"""Is a user currently logged in?
|
|
|
|
|
|
"""
|
|
|
user = self.get_current_user()
|
|
|
return (user and not user == 'anonymous')
|
|
|
|
|
|
@property
|
|
|
def login_available(self):
|
|
|
"""May a user proceed to log in?
|
|
|
|
|
|
This returns True if login capability is available, irrespective of
|
|
|
whether the user is already logged in or not.
|
|
|
|
|
|
"""
|
|
|
return bool(self.settings.get('password', ''))
|
|
|
|
|
|
|
|
|
class IPythonHandler(AuthenticatedHandler):
|
|
|
"""IPython-specific extensions to authenticated handling
|
|
|
|
|
|
Mostly property shortcuts to IPython-specific settings.
|
|
|
"""
|
|
|
|
|
|
@property
|
|
|
def config(self):
|
|
|
return self.settings.get('config', None)
|
|
|
|
|
|
@property
|
|
|
def log(self):
|
|
|
"""use the IPython log by default, falling back on tornado's logger"""
|
|
|
if Application.initialized():
|
|
|
return Application.instance().log
|
|
|
else:
|
|
|
return app_log
|
|
|
|
|
|
#---------------------------------------------------------------
|
|
|
# URLs
|
|
|
#---------------------------------------------------------------
|
|
|
|
|
|
@property
|
|
|
def mathjax_url(self):
|
|
|
return self.settings.get('mathjax_url', '')
|
|
|
|
|
|
@property
|
|
|
def base_url(self):
|
|
|
return self.settings.get('base_url', '/')
|
|
|
|
|
|
@property
|
|
|
def ws_url(self):
|
|
|
return self.settings.get('websocket_url', '')
|
|
|
|
|
|
@property
|
|
|
def contents_js_source(self):
|
|
|
self.log.debug("Using contents: %s", self.settings.get('contents_js_source',
|
|
|
'services/contents'))
|
|
|
return self.settings.get('contents_js_source', 'services/contents')
|
|
|
|
|
|
#---------------------------------------------------------------
|
|
|
# Manager objects
|
|
|
#---------------------------------------------------------------
|
|
|
|
|
|
@property
|
|
|
def kernel_manager(self):
|
|
|
return self.settings['kernel_manager']
|
|
|
|
|
|
@property
|
|
|
def contents_manager(self):
|
|
|
return self.settings['contents_manager']
|
|
|
|
|
|
@property
|
|
|
def cluster_manager(self):
|
|
|
return self.settings['cluster_manager']
|
|
|
|
|
|
@property
|
|
|
def session_manager(self):
|
|
|
return self.settings['session_manager']
|
|
|
|
|
|
@property
|
|
|
def kernel_spec_manager(self):
|
|
|
return self.settings['kernel_spec_manager']
|
|
|
|
|
|
#---------------------------------------------------------------
|
|
|
# CORS
|
|
|
#---------------------------------------------------------------
|
|
|
|
|
|
@property
|
|
|
def allow_origin(self):
|
|
|
"""Normal Access-Control-Allow-Origin"""
|
|
|
return self.settings.get('allow_origin', '')
|
|
|
|
|
|
@property
|
|
|
def allow_origin_pat(self):
|
|
|
"""Regular expression version of allow_origin"""
|
|
|
return self.settings.get('allow_origin_pat', None)
|
|
|
|
|
|
@property
|
|
|
def allow_credentials(self):
|
|
|
"""Whether to set Access-Control-Allow-Credentials"""
|
|
|
return self.settings.get('allow_credentials', False)
|
|
|
|
|
|
def set_default_headers(self):
|
|
|
"""Add CORS headers, if defined"""
|
|
|
super(IPythonHandler, self).set_default_headers()
|
|
|
if self.allow_origin:
|
|
|
self.set_header("Access-Control-Allow-Origin", self.allow_origin)
|
|
|
elif self.allow_origin_pat:
|
|
|
origin = self.get_origin()
|
|
|
if origin and self.allow_origin_pat.match(origin):
|
|
|
self.set_header("Access-Control-Allow-Origin", origin)
|
|
|
if self.allow_credentials:
|
|
|
self.set_header("Access-Control-Allow-Credentials", 'true')
|
|
|
|
|
|
def get_origin(self):
|
|
|
# Handle WebSocket Origin naming convention differences
|
|
|
# The difference between version 8 and 13 is that in 8 the
|
|
|
# client sends a "Sec-Websocket-Origin" header and in 13 it's
|
|
|
# simply "Origin".
|
|
|
if "Origin" in self.request.headers:
|
|
|
origin = self.request.headers.get("Origin")
|
|
|
else:
|
|
|
origin = self.request.headers.get("Sec-Websocket-Origin", None)
|
|
|
return origin
|
|
|
|
|
|
#---------------------------------------------------------------
|
|
|
# template rendering
|
|
|
#---------------------------------------------------------------
|
|
|
|
|
|
def get_template(self, name):
|
|
|
"""Return the jinja template object for a given name"""
|
|
|
return self.settings['jinja2_env'].get_template(name)
|
|
|
|
|
|
def render_template(self, name, **ns):
|
|
|
ns.update(self.template_namespace)
|
|
|
template = self.get_template(name)
|
|
|
return template.render(**ns)
|
|
|
|
|
|
@property
|
|
|
def template_namespace(self):
|
|
|
return dict(
|
|
|
base_url=self.base_url,
|
|
|
ws_url=self.ws_url,
|
|
|
logged_in=self.logged_in,
|
|
|
login_available=self.login_available,
|
|
|
static_url=self.static_url,
|
|
|
sys_info=sys_info,
|
|
|
contents_js_source=self.contents_js_source,
|
|
|
)
|
|
|
|
|
|
def get_json_body(self):
|
|
|
"""Return the body of the request as JSON data."""
|
|
|
if not self.request.body:
|
|
|
return None
|
|
|
# Do we need to call body.decode('utf-8') here?
|
|
|
body = self.request.body.strip().decode(u'utf-8')
|
|
|
try:
|
|
|
model = json.loads(body)
|
|
|
except Exception:
|
|
|
self.log.debug("Bad JSON: %r", body)
|
|
|
self.log.error("Couldn't parse JSON", exc_info=True)
|
|
|
raise web.HTTPError(400, u'Invalid JSON in body of request')
|
|
|
return model
|
|
|
|
|
|
def write_error(self, status_code, **kwargs):
|
|
|
"""render custom error pages"""
|
|
|
exc_info = kwargs.get('exc_info')
|
|
|
message = ''
|
|
|
status_message = responses.get(status_code, 'Unknown HTTP Error')
|
|
|
if exc_info:
|
|
|
exception = exc_info[1]
|
|
|
# get the custom message, if defined
|
|
|
try:
|
|
|
message = exception.log_message % exception.args
|
|
|
except Exception:
|
|
|
pass
|
|
|
|
|
|
# construct the custom reason, if defined
|
|
|
reason = getattr(exception, 'reason', '')
|
|
|
if reason:
|
|
|
status_message = reason
|
|
|
|
|
|
# build template namespace
|
|
|
ns = dict(
|
|
|
status_code=status_code,
|
|
|
status_message=status_message,
|
|
|
message=message,
|
|
|
exception=exception,
|
|
|
)
|
|
|
|
|
|
self.set_header('Content-Type', 'text/html')
|
|
|
# render the template
|
|
|
try:
|
|
|
html = self.render_template('%s.html' % status_code, **ns)
|
|
|
except TemplateNotFound:
|
|
|
self.log.debug("No template for %d", status_code)
|
|
|
html = self.render_template('error.html', **ns)
|
|
|
|
|
|
self.write(html)
|
|
|
|
|
|
|
|
|
|
|
|
class Template404(IPythonHandler):
|
|
|
"""Render our 404 template"""
|
|
|
def prepare(self):
|
|
|
raise web.HTTPError(404)
|
|
|
|
|
|
|
|
|
class AuthenticatedFileHandler(IPythonHandler, web.StaticFileHandler):
|
|
|
"""static files should only be accessible when logged in"""
|
|
|
|
|
|
@web.authenticated
|
|
|
def get(self, path):
|
|
|
if os.path.splitext(path)[1] == '.ipynb':
|
|
|
name = path.rsplit('/', 1)[-1]
|
|
|
self.set_header('Content-Type', 'application/json')
|
|
|
self.set_header('Content-Disposition','attachment; filename="%s"' % name)
|
|
|
|
|
|
return web.StaticFileHandler.get(self, path)
|
|
|
|
|
|
def compute_etag(self):
|
|
|
return None
|
|
|
|
|
|
def validate_absolute_path(self, root, absolute_path):
|
|
|
"""Validate and return the absolute path.
|
|
|
|
|
|
Requires tornado 3.1
|
|
|
|
|
|
Adding to tornado's own handling, forbids the serving of hidden files.
|
|
|
"""
|
|
|
abs_path = super(AuthenticatedFileHandler, self).validate_absolute_path(root, absolute_path)
|
|
|
abs_root = os.path.abspath(root)
|
|
|
if is_hidden(abs_path, abs_root):
|
|
|
self.log.info("Refusing to serve hidden file, via 404 Error")
|
|
|
raise web.HTTPError(404)
|
|
|
return abs_path
|
|
|
|
|
|
|
|
|
def json_errors(method):
|
|
|
"""Decorate methods with this to return GitHub style JSON errors.
|
|
|
|
|
|
This should be used on any JSON API on any handler method that can raise HTTPErrors.
|
|
|
|
|
|
This will grab the latest HTTPError exception using sys.exc_info
|
|
|
and then:
|
|
|
|
|
|
1. Set the HTTP status code based on the HTTPError
|
|
|
2. Create and return a JSON body with a message field describing
|
|
|
the error in a human readable form.
|
|
|
"""
|
|
|
@functools.wraps(method)
|
|
|
def wrapper(self, *args, **kwargs):
|
|
|
try:
|
|
|
result = method(self, *args, **kwargs)
|
|
|
except web.HTTPError as e:
|
|
|
status = e.status_code
|
|
|
message = e.log_message
|
|
|
self.log.warn(message)
|
|
|
self.set_status(e.status_code)
|
|
|
self.finish(json.dumps(dict(message=message)))
|
|
|
except Exception:
|
|
|
self.log.error("Unhandled error in API request", exc_info=True)
|
|
|
status = 500
|
|
|
message = "Unknown server error"
|
|
|
t, value, tb = sys.exc_info()
|
|
|
self.set_status(status)
|
|
|
tb_text = ''.join(traceback.format_exception(t, value, tb))
|
|
|
reply = dict(message=message, traceback=tb_text)
|
|
|
self.finish(json.dumps(reply))
|
|
|
else:
|
|
|
return result
|
|
|
return wrapper
|
|
|
|
|
|
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# File handler
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
# to minimize subclass changes:
|
|
|
HTTPError = web.HTTPError
|
|
|
|
|
|
class FileFindHandler(web.StaticFileHandler):
|
|
|
"""subclass of StaticFileHandler for serving files from a search path"""
|
|
|
|
|
|
# cache search results, don't search for files more than once
|
|
|
_static_paths = {}
|
|
|
|
|
|
def initialize(self, path, default_filename=None):
|
|
|
if isinstance(path, string_types):
|
|
|
path = [path]
|
|
|
|
|
|
self.root = tuple(
|
|
|
os.path.abspath(os.path.expanduser(p)) + os.sep for p in path
|
|
|
)
|
|
|
self.default_filename = default_filename
|
|
|
|
|
|
def compute_etag(self):
|
|
|
return None
|
|
|
|
|
|
@classmethod
|
|
|
def get_absolute_path(cls, roots, path):
|
|
|
"""locate a file to serve on our static file search path"""
|
|
|
with cls._lock:
|
|
|
if path in cls._static_paths:
|
|
|
return cls._static_paths[path]
|
|
|
try:
|
|
|
abspath = os.path.abspath(filefind(path, roots))
|
|
|
except IOError:
|
|
|
# IOError means not found
|
|
|
return ''
|
|
|
|
|
|
cls._static_paths[path] = abspath
|
|
|
return abspath
|
|
|
|
|
|
def validate_absolute_path(self, root, absolute_path):
|
|
|
"""check if the file should be served (raises 404, 403, etc.)"""
|
|
|
if absolute_path == '':
|
|
|
raise web.HTTPError(404)
|
|
|
|
|
|
for root in self.root:
|
|
|
if (absolute_path + os.sep).startswith(root):
|
|
|
break
|
|
|
|
|
|
return super(FileFindHandler, self).validate_absolute_path(root, absolute_path)
|
|
|
|
|
|
|
|
|
class ApiVersionHandler(IPythonHandler):
|
|
|
|
|
|
@json_errors
|
|
|
def get(self):
|
|
|
# not authenticated, so give as few info as possible
|
|
|
self.finish(json.dumps({"version":IPython.__version__}))
|
|
|
|
|
|
|
|
|
class TrailingSlashHandler(web.RequestHandler):
|
|
|
"""Simple redirect handler that strips trailing slashes
|
|
|
|
|
|
This should be the first, highest priority handler.
|
|
|
"""
|
|
|
|
|
|
def get(self):
|
|
|
self.redirect(self.request.uri.rstrip('/'))
|
|
|
|
|
|
post = put = get
|
|
|
|
|
|
|
|
|
class FilesRedirectHandler(IPythonHandler):
|
|
|
"""Handler for redirecting relative URLs to the /files/ handler"""
|
|
|
def get(self, path=''):
|
|
|
cm = self.contents_manager
|
|
|
if cm.dir_exists(path):
|
|
|
# it's a *directory*, redirect to /tree
|
|
|
url = url_path_join(self.base_url, 'tree', path)
|
|
|
else:
|
|
|
orig_path = path
|
|
|
# otherwise, redirect to /files
|
|
|
parts = path.split('/')
|
|
|
|
|
|
if not cm.file_exists(path=path) and 'files' in parts:
|
|
|
# redirect without files/ iff it would 404
|
|
|
# this preserves pre-2.0-style 'files/' links
|
|
|
self.log.warn("Deprecated files/ URL: %s", orig_path)
|
|
|
parts.remove('files')
|
|
|
path = '/'.join(parts)
|
|
|
|
|
|
if not cm.file_exists(path=path):
|
|
|
raise web.HTTPError(404)
|
|
|
|
|
|
url = url_path_join(self.base_url, 'files', path)
|
|
|
url = url_escape(url)
|
|
|
self.log.debug("Redirecting %s to %s", self.request.path, url)
|
|
|
self.redirect(url)
|
|
|
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# URL pattern fragments for re-use
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
# path matches any number of `/foo[/bar...]` or just `/` or ''
|
|
|
path_regex = r"(?P<path>(?:(?:/[^/]+)+|/?))"
|
|
|
notebook_path_regex = r"(?P<path>(?:/[^/]+)+\.ipynb)"
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# URL to handler mappings
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
default_handlers = [
|
|
|
(r".*/", TrailingSlashHandler),
|
|
|
(r"api", ApiVersionHandler)
|
|
|
]
|
|
|
|
