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app.py
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app.py
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#!/usr/bin/env python3
"""The multi-user notebook application"""
# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
import asyncio
import atexit
import binascii
import logging
import os
import re
import secrets
import signal
import socket
import sys
import time
from concurrent.futures import ThreadPoolExecutor
from datetime import datetime
from datetime import timedelta
from datetime import timezone
from functools import partial
from getpass import getuser
from glob import glob
from itertools import chain
from operator import itemgetter
from textwrap import dedent
from urllib.parse import unquote
from urllib.parse import urlparse
from urllib.parse import urlunparse
if sys.version_info[:2] < (3, 3):
raise ValueError("Python < 3.3 not supported: %s" % sys.version)
# For compatibility with python versions 3.6 or earlier.
# asyncio.Task.all_tasks() is fully moved to asyncio.all_tasks() starting with 3.9. Also applies to current_task.
try:
asyncio_all_tasks = asyncio.all_tasks
asyncio_current_task = asyncio.current_task
except AttributeError as e:
asyncio_all_tasks = asyncio.Task.all_tasks
asyncio_current_task = asyncio.Task.current_task
from dateutil.parser import parse as parse_date
from jinja2 import Environment, FileSystemLoader, PrefixLoader, ChoiceLoader
from sqlalchemy.exc import OperationalError, SQLAlchemyError
from tornado.httpclient import AsyncHTTPClient
import tornado.httpserver
from tornado.ioloop import IOLoop, PeriodicCallback
from tornado.log import app_log, access_log, gen_log
import tornado.options
from tornado import gen, web
from traitlets import (
Unicode,
Integer,
Dict,
TraitError,
List,
Bool,
Any,
Tuple,
Type,
Set,
Instance,
Bytes,
Float,
Union,
observe,
default,
validate,
)
from traitlets.config import Application, Configurable, catch_config_error
from jupyter_telemetry.eventlog import EventLog
here = os.path.dirname(__file__)
import jupyterhub
from . import handlers, apihandlers
from .handlers.static import CacheControlStaticFilesHandler, LogoHandler
from .services.service import Service
from . import crypto
from . import dbutil, orm
from . import roles
from .user import UserDict
from .oauth.provider import make_provider
from ._data import DATA_FILES_PATH
from .log import CoroutineLogFormatter, log_request
from .proxy import Proxy, ConfigurableHTTPProxy
from .traitlets import URLPrefix, Command, EntryPointType, Callable
from .utils import (
AnyTimeoutError,
catch_db_error,
maybe_future,
url_path_join,
print_stacks,
print_ps_info,
make_ssl_context,
)
from .metrics import HUB_STARTUP_DURATION_SECONDS
from .metrics import INIT_SPAWNERS_DURATION_SECONDS
from .metrics import RUNNING_SERVERS
from .metrics import TOTAL_USERS
# classes for config
from .auth import Authenticator, PAMAuthenticator
from .crypto import CryptKeeper
from .spawner import Spawner, LocalProcessSpawner
from .objects import Hub, Server
# For faking stats
from .emptyclass import EmptyClass
common_aliases = {
'log-level': 'Application.log_level',
'f': 'JupyterHub.config_file',
'config': 'JupyterHub.config_file',
'db': 'JupyterHub.db_url',
}
if isinstance(Application.aliases, dict):
common_aliases.update(Application.aliases)
aliases = {
'base-url': 'JupyterHub.base_url',
'y': 'JupyterHub.answer_yes',
'ssl-key': 'JupyterHub.ssl_key',
'ssl-cert': 'JupyterHub.ssl_cert',
'url': 'JupyterHub.bind_url',
'ip': 'JupyterHub.ip',
'port': 'JupyterHub.port',
'pid-file': 'JupyterHub.pid_file',
'log-file': 'JupyterHub.extra_log_file',
}
token_aliases = {}
token_aliases.update(common_aliases)
aliases.update(common_aliases)
flags = {}
if isinstance(Application.flags, dict):
flags.update(Application.flags)
hub_flags = {
'debug': (
{'Application': {'log_level': logging.DEBUG}},
"set log level to logging.DEBUG (maximize logging output)",
),
'generate-config': (
{'JupyterHub': {'generate_config': True}},
"generate default config file",
),
'generate-certs': (
{'JupyterHub': {'generate_certs': True}},
"generate certificates used for internal ssl",
),
'no-db': (
{'JupyterHub': {'db_url': 'sqlite:///:memory:'}},
"disable persisting state database to disk",
),
'upgrade-db': (
{'JupyterHub': {'upgrade_db': True}},
"""Automatically upgrade the database if needed on startup.
Only safe if the database has been backed up.
Only SQLite database files will be backed up automatically.
""",
),
'no-ssl': (
{'JupyterHub': {'confirm_no_ssl': True}},
"[DEPRECATED in 0.7: does nothing]",
),
}
flags.update(hub_flags)
COOKIE_SECRET_BYTES = (
32 # the number of bytes to use when generating new cookie secrets
)
HEX_RE = re.compile('^([a-f0-9]{2})+$', re.IGNORECASE)
_mswindows = os.name == "nt"
class NewToken(Application):
"""Generate and print a new API token"""
name = 'jupyterhub-token'
version = jupyterhub.__version__
description = """Generate and return new API token for a user.
Usage:
jupyterhub token [username]
"""
examples = """
$> jupyterhub token kaylee
ab01cd23ef45
"""
name = Unicode()
@default('name')
def _default_name(self):
return getuser()
aliases = token_aliases
classes = []
def parse_command_line(self, argv=None):
super().parse_command_line(argv=argv)
if not self.extra_args:
return
if len(self.extra_args) > 1:
print("Must specify exactly one username", file=sys.stderr)
self.exit(1)
self.name = self.extra_args[0]
def start(self):
hub = JupyterHub(parent=self)
hub.load_config_file(hub.config_file)
hub.init_db()
def init_roles_and_users():
loop = asyncio.new_event_loop()
loop.run_until_complete(hub.init_role_creation())
loop.run_until_complete(hub.init_users())
ThreadPoolExecutor(1).submit(init_roles_and_users).result()
user = orm.User.find(hub.db, self.name)
if user is None:
print("No such user: %s" % self.name, file=sys.stderr)
self.exit(1)
token = user.new_api_token(note="command-line generated")
print(token)
class UpgradeDB(Application):
"""Upgrade the JupyterHub database schema."""
name = 'jupyterhub-upgrade-db'
version = jupyterhub.__version__
description = """Upgrade the JupyterHub database to the current schema.
Usage:
jupyterhub upgrade-db
"""
aliases = common_aliases
classes = []
def start(self):
hub = JupyterHub(parent=self)
hub.load_config_file(hub.config_file)
self.log = hub.log
dbutil.upgrade_if_needed(hub.db_url, log=self.log)
class JupyterHub(Application):
"""An Application for starting a Multi-User Jupyter Notebook server."""
name = 'jupyterhub'
version = jupyterhub.__version__
description = """Start a multi-user Jupyter Notebook server
Spawns a configurable-http-proxy and multi-user Hub,
which authenticates users and spawns single-user Notebook servers
on behalf of users.
"""
examples = """
generate default config file:
jupyterhub --generate-config -f /etc/jupyterhub/jupyterhub_config.py
spawn the server on 10.0.1.2:443 with https:
jupyterhub --ip 10.0.1.2 --port 443 --ssl-key my_ssl.key --ssl-cert my_ssl.cert
"""
aliases = Dict(aliases)
flags = Dict(flags)
raise_config_file_errors = True
subcommands = {
'token': (NewToken, "Generate an API token for a user"),
'upgrade-db': (
UpgradeDB,
"Upgrade your JupyterHub state database to the current version.",
),
}
classes = List()
@default('classes')
def _load_classes(self):
classes = [Spawner, Authenticator, CryptKeeper]
for name, trait in self.traits(config=True).items():
# load entry point groups into configurable class list
# so that they show up in config files, etc.
if isinstance(trait, EntryPointType):
for key, entry_point in trait.load_entry_points().items():
try:
cls = entry_point.load()
except Exception as e:
self.log.debug(
"Failed to load %s entrypoint %r: %r",
trait.entry_point_group,
key,
e,
)
continue
if cls not in classes and isinstance(cls, Configurable):
classes.append(cls)
return classes
load_groups = Dict(
List(Unicode()),
help="""Dict of 'group': ['usernames'] to load at startup.
This strictly *adds* groups and users to groups.
Loading one set of groups, then starting JupyterHub again with a different
set will not remove users or groups from previous launches.
That must be done through the API.
""",
).tag(config=True)
load_roles = List(
Dict(),
help="""List of predefined role dictionaries to load at startup.
For instance::
load_roles = [
{
'name': 'teacher',
'description': 'Access to users' information and group membership',
'scopes': ['users', 'groups'],
'users': ['cyclops', 'gandalf'],
'services': [],
'groups': []
}
]
All keys apart from 'name' are optional.
See all the available scopes in the JupyterHub REST API documentation.
Default roles are defined in roles.py.
""",
).tag(config=True)
config_file = Unicode('jupyterhub_config.py', help="The config file to load").tag(
config=True
)
@validate("config_file")
def _validate_config_file(self, proposal):
if not self.generate_config and not os.path.isfile(proposal.value):
print(
"ERROR: Failed to find specified config file: {}".format(
proposal.value
),
file=sys.stderr,
)
sys.exit(1)
return proposal.value
generate_config = Bool(False, help="Generate default config file").tag(config=True)
generate_certs = Bool(False, help="Generate certs used for internal ssl").tag(
config=True
)
answer_yes = Bool(
False, help="Answer yes to any questions (e.g. confirm overwrite)"
).tag(config=True)
pid_file = Unicode(
'',
help="""File to write PID
Useful for daemonizing JupyterHub.
""",
).tag(config=True)
cookie_max_age_days = Float(
14,
help="""Number of days for a login cookie to be valid.
Default is two weeks.
""",
).tag(config=True)
oauth_token_expires_in = Integer(
help="""Expiry (in seconds) of OAuth access tokens.
The default is to expire when the cookie storing them expires,
according to `cookie_max_age_days` config.
These are the tokens stored in cookies when you visit
a single-user server or service.
When they expire, you must re-authenticate with the Hub,
even if your Hub authentication is still valid.
If your Hub authentication is valid,
logging in may be a transparent redirect as you refresh the page.
This does not affect JupyterHub API tokens in general,
which do not expire by default.
Only tokens issued during the oauth flow
accessing services and single-user servers are affected.
.. versionadded:: 1.4
OAuth token expires_in was not previously configurable.
.. versionchanged:: 1.4
Default now uses cookie_max_age_days so that oauth tokens
which are generally stored in cookies,
expire when the cookies storing them expire.
Previously, it was one hour.
""",
config=True,
)
@default("oauth_token_expires_in")
def _cookie_max_age_seconds(self):
"""default to cookie max age, where these tokens are stored"""
# convert cookie max age days to seconds
return int(self.cookie_max_age_days * 24 * 3600)
redirect_to_server = Bool(
True, help="Redirect user to server (if running), instead of control panel."
).tag(config=True)
activity_resolution = Integer(
30,
help="""
Resolution (in seconds) for updating activity
If activity is registered that is less than activity_resolution seconds
more recent than the current value,
the new value will be ignored.
This avoids too many writes to the Hub database.
""",
).tag(config=True)
last_activity_interval = Integer(
300, help="Interval (in seconds) at which to update last-activity timestamps."
).tag(config=True)
proxy_check_interval = Integer(
5,
help="DEPRECATED since version 0.8: Use ConfigurableHTTPProxy.check_running_interval",
).tag(config=True)
service_check_interval = Integer(
60,
help="Interval (in seconds) at which to check connectivity of services with web endpoints.",
).tag(config=True)
active_user_window = Integer(
30 * 60, help="Duration (in seconds) to determine the number of active users."
).tag(config=True)
data_files_path = Unicode(
DATA_FILES_PATH,
help="The location of jupyterhub data files (e.g. /usr/local/share/jupyterhub)",
).tag(config=True)
template_paths = List(
help="Paths to search for jinja templates, before using the default templates."
).tag(config=True)
@default('template_paths')
def _template_paths_default(self):
return [os.path.join(self.data_files_path, 'templates')]
template_vars = Dict(help="Extra variables to be passed into jinja templates").tag(
config=True
)
confirm_no_ssl = Bool(False, help="""DEPRECATED: does nothing""").tag(config=True)
ssl_key = Unicode(
'',
help="""Path to SSL key file for the public facing interface of the proxy
When setting this, you should also set ssl_cert
""",
).tag(config=True)
ssl_cert = Unicode(
'',
help="""Path to SSL certificate file for the public facing interface of the proxy
When setting this, you should also set ssl_key
""",
).tag(config=True)
internal_ssl = Bool(
False,
help="""Enable SSL for all internal communication
This enables end-to-end encryption between all JupyterHub components.
JupyterHub will automatically create the necessary certificate
authority and sign notebook certificates as they're created.
""",
).tag(config=True)
internal_certs_location = Unicode(
'internal-ssl',
help="""The location to store certificates automatically created by
JupyterHub.
Use with internal_ssl
""",
).tag(config=True)
recreate_internal_certs = Bool(
False,
help="""Recreate all certificates used within JupyterHub on restart.
Note: enabling this feature requires restarting all notebook servers.
Use with internal_ssl
""",
).tag(config=True)
external_ssl_authorities = Dict(
help="""Dict authority:dict(files). Specify the key, cert, and/or
ca file for an authority. This is useful for externally managed
proxies that wish to use internal_ssl.
The files dict has this format (you must specify at least a cert)::
{
'key': '/path/to/key.key',
'cert': '/path/to/cert.crt',
'ca': '/path/to/ca.crt'
}
The authorities you can override: 'hub-ca', 'notebooks-ca',
'proxy-api-ca', 'proxy-client-ca', and 'services-ca'.
Use with internal_ssl
"""
).tag(config=True)
internal_ssl_authorities = Dict(
default_value={
'hub-ca': None,
'notebooks-ca': None,
'proxy-api-ca': None,
'proxy-client-ca': None,
'services-ca': None,
},
help="""Dict authority:dict(files). When creating the various
CAs needed for internal_ssl, these are the names that will be used
for each authority.
Use with internal_ssl
""",
)
internal_ssl_components_trust = Dict(
help="""Dict component:list(components). This dict specifies the
relationships of components secured by internal_ssl.
"""
)
internal_trust_bundles = Dict(
help="""Dict component:path. These are the paths to the trust bundles
that each component should have. They will be set during
`init_internal_ssl`.
Use with internal_ssl
"""
)
internal_ssl_key = Unicode(help="""The key to be used for internal ssl""")
internal_ssl_cert = Unicode(help="""The cert to be used for internal ssl""")
internal_ssl_ca = Unicode(
help="""The certificate authority to be used for internal ssl"""
)
internal_proxy_certs = Dict(
help=""" Dict component:dict(cert files). This dict contains the certs
generated for both the proxy API and proxy client.
"""
)
trusted_alt_names = List(
Unicode(),
help="""Names to include in the subject alternative name.
These names will be used for server name verification. This is useful
if JupyterHub is being run behind a reverse proxy or services using ssl
are on different hosts.
Use with internal_ssl
""",
).tag(config=True)
trusted_downstream_ips = List(
Unicode(),
help="""Downstream proxy IP addresses to trust.
This sets the list of IP addresses that are trusted and skipped when processing
the `X-Forwarded-For` header. For example, if an external proxy is used for TLS
termination, its IP address should be added to this list to ensure the correct
client IP addresses are recorded in the logs instead of the proxy server's IP
address.
""",
).tag(config=True)
ip = Unicode(
'',
help="""The public facing ip of the whole JupyterHub application
(specifically referred to as the proxy).
This is the address on which the proxy will listen. The default is to
listen on all interfaces. This is the only address through which JupyterHub
should be accessed by users.
.. deprecated: 0.9
Use JupyterHub.bind_url
""",
).tag(config=True)
port = Integer(
8000,
help="""The public facing port of the proxy.
This is the port on which the proxy will listen.
This is the only port through which JupyterHub
should be accessed by users.
.. deprecated: 0.9
Use JupyterHub.bind_url
""",
).tag(config=True)
base_url = URLPrefix(
'/',
help="""The base URL of the entire application.
Add this to the beginning of all JupyterHub URLs.
Use base_url to run JupyterHub within an existing website.
.. deprecated: 0.9
Use JupyterHub.bind_url
""",
).tag(config=True)
@default('base_url')
def _default_base_url(self):
# call validate to ensure leading/trailing slashes
return JupyterHub.base_url.validate(self, urlparse(self.bind_url).path)
@observe('ip', 'port', 'base_url')
def _url_part_changed(self, change):
"""propagate deprecated ip/port/base_url config to the bind_url"""
urlinfo = urlparse(self.bind_url)
if ':' in self.ip:
fmt = '[%s]:%i'
else:
fmt = '%s:%i'
urlinfo = urlinfo._replace(netloc=fmt % (self.ip, self.port))
urlinfo = urlinfo._replace(path=self.base_url)
bind_url = urlunparse(urlinfo)
# Warn if both bind_url and ip/port/base_url are set
if bind_url != self.bind_url:
if self.bind_url != self._bind_url_default():
self.log.warning(
"Both bind_url and ip/port/base_url have been configured. "
"JupyterHub.ip, JupyterHub.port, JupyterHub.base_url are"
" deprecated in JupyterHub 0.9,"
" please use JupyterHub.bind_url instead."
)
self.bind_url = bind_url
bind_url = Unicode(
"http://:8000",
help="""The public facing URL of the whole JupyterHub application.
This is the address on which the proxy will bind.
Sets protocol, ip, base_url
""",
).tag(config=True)
@validate('bind_url')
def _validate_bind_url(self, proposal):
"""ensure protocol field of bind_url matches ssl"""
v = proposal['value']
proto, sep, rest = v.partition('://')
if self.ssl_cert and proto != 'https':
return 'https' + sep + rest
elif proto != 'http' and not self.ssl_cert:
return 'http' + sep + rest
return v
@default('bind_url')
def _bind_url_default(self):
proto = 'https' if self.ssl_cert else 'http'
return proto + '://:8000'
subdomain_host = Unicode(
'',
help="""Run single-user servers on subdomains of this host.
This should be the full `https://hub.domain.tld[:port]`.
Provides additional cross-site protections for javascript served by single-user servers.
Requires `<username>.hub.domain.tld` to resolve to the same host as `hub.domain.tld`.
In general, this is most easily achieved with wildcard DNS.
When using SSL (i.e. always) this also requires a wildcard SSL certificate.
""",
).tag(config=True)
def _subdomain_host_changed(self, name, old, new):
if new and '://' not in new:
# host should include '://'
# if not specified, assume https: You have to be really explicit about HTTP!
self.subdomain_host = 'https://' + new
domain = Unicode(help="domain name, e.g. 'example.com' (excludes protocol, port)")
@default('domain')
def _domain_default(self):
if not self.subdomain_host:
return ''
return urlparse(self.subdomain_host).hostname
logo_file = Unicode(
'',
help="Specify path to a logo image to override the Jupyter logo in the banner.",
).tag(config=True)
@default('logo_file')
def _logo_file_default(self):
return os.path.join(
self.data_files_path, 'static', 'images', 'jupyterhub-80.png'
)
jinja_environment_options = Dict(
help="Supply extra arguments that will be passed to Jinja environment."
).tag(config=True)
proxy_class = EntryPointType(
default_value=ConfigurableHTTPProxy,
klass=Proxy,
entry_point_group="jupyterhub.proxies",
help="""The class to use for configuring the JupyterHub proxy.
Should be a subclass of :class:`jupyterhub.proxy.Proxy`.
.. versionchanged:: 1.0
proxies may be registered via entry points,
e.g. `c.JupyterHub.proxy_class = 'traefik'`
""",
).tag(config=True)
proxy_cmd = Command(
[],
config=True,
help="DEPRECATED since version 0.8. Use ConfigurableHTTPProxy.command",
).tag(config=True)
debug_proxy = Bool(
False, help="DEPRECATED since version 0.8: Use ConfigurableHTTPProxy.debug"
).tag(config=True)
proxy_auth_token = Unicode(
help="DEPRECATED since version 0.8: Use ConfigurableHTTPProxy.auth_token"
).tag(config=True)
_proxy_config_map = {
'proxy_check_interval': 'check_running_interval',
'proxy_cmd': 'command',
'debug_proxy': 'debug',
'proxy_auth_token': 'auth_token',
}
@observe(*_proxy_config_map)
def _deprecated_proxy_config(self, change):
dest = self._proxy_config_map[change.name]
self.log.warning(
"JupyterHub.%s is deprecated in JupyterHub 0.8, use ConfigurableHTTPProxy.%s",
change.name,
dest,
)
self.config.ConfigurableHTTPProxy[dest] = change.new
proxy_api_ip = Unicode(
help="DEPRECATED since version 0.8 : Use ConfigurableHTTPProxy.api_url"
).tag(config=True)
proxy_api_port = Integer(
help="DEPRECATED since version 0.8 : Use ConfigurableHTTPProxy.api_url"
).tag(config=True)
@observe('proxy_api_port', 'proxy_api_ip')
def _deprecated_proxy_api(self, change):
self.log.warning(
"JupyterHub.%s is deprecated in JupyterHub 0.8, use ConfigurableHTTPProxy.api_url",
change.name,
)
self.config.ConfigurableHTTPProxy.api_url = 'http://{}:{}'.format(
self.proxy_api_ip or '127.0.0.1', self.proxy_api_port or self.port + 1
)
forwarded_host_header = Unicode(
'',
help="""Alternate header to use as the Host (e.g., X-Forwarded-Host)
when determining whether a request is cross-origin
This may be useful when JupyterHub is running behind a proxy that rewrites
the Host header.
""",
).tag(config=True)
hub_port = Integer(
8081,
help="""The internal port for the Hub process.
This is the internal port of the hub itself. It should never be accessed directly.
See JupyterHub.port for the public port to use when accessing jupyterhub.
It is rare that this port should be set except in cases of port conflict.
See also `hub_ip` for the ip and `hub_bind_url` for setting the full bind URL.
""",
).tag(config=True)
hub_ip = Unicode(
'127.0.0.1',
help="""The ip address for the Hub process to *bind* to.
By default, the hub listens on localhost only. This address must be accessible from
the proxy and user servers. You may need to set this to a public ip or '' for all
interfaces if the proxy or user servers are in containers or on a different host.
See `hub_connect_ip` for cases where the bind and connect address should differ,
or `hub_bind_url` for setting the full bind URL.
""",
).tag(config=True)
hub_connect_ip = Unicode(
'',
help="""The ip or hostname for proxies and spawners to use
for connecting to the Hub.
Use when the bind address (`hub_ip`) is 0.0.0.0, :: or otherwise different
from the connect address.
Default: when `hub_ip` is 0.0.0.0 or ::, use `socket.gethostname()`, otherwise use `hub_ip`.
Note: Some spawners or proxy implementations might not support hostnames. Check your
spawner or proxy documentation to see if they have extra requirements.
.. versionadded:: 0.8
""",
).tag(config=True)
hub_connect_url = Unicode(
help="""
The URL for connecting to the Hub.
Spawners, services, and the proxy will use this URL
to talk to the Hub.
Only needs to be specified if the default hub URL is not
connectable (e.g. using a unix+http:// bind url).
.. seealso::
JupyterHub.hub_connect_ip
JupyterHub.hub_bind_url
.. versionadded:: 0.9
""",
config=True,
)
hub_bind_url = Unicode(
help="""
The URL on which the Hub will listen.
This is a private URL for internal communication.
Typically set in combination with hub_connect_url.
If a unix socket, hub_connect_url **must** also be set.
For example:
"http://127.0.0.1:8081"
"unix+http://%2Fsrv%2Fjupyterhub%2Fjupyterhub.sock"
.. versionadded:: 0.9
""",
config=True,
)
hub_connect_port = Integer(
0,
help="""
DEPRECATED
Use hub_connect_url
.. versionadded:: 0.8
.. deprecated:: 0.9
Use hub_connect_url
""",
).tag(config=True)
hub_prefix = URLPrefix(
'/hub/', help="The prefix for the hub server. Always /base_url/hub/"
)
@default('hub_prefix')
def _hub_prefix_default(self):
return url_path_join(self.base_url, '/hub/')
hub_routespec = Unicode(
"/",
help="""
The routing prefix for the Hub itself.
Override to send only a subset of traffic to the Hub.
Default is to use the Hub as the default route for all requests.
This is necessary for normal jupyterhub operation,
as the Hub must receive requests for e.g. `/user/:name`
when the user's server is not running.
However, some deployments using only the JupyterHub API
may want to handle these events themselves,
in which case they can register their own default target with the proxy
and set e.g. `hub_routespec = /hub/` to serve only the hub's own pages, or even `/hub/api/` for api-only operation.
Note: hub_routespec must include the base_url, if any.
.. versionadded:: 1.4
""",
).tag(config=True)
@default("hub_routespec")
def _default_hub_routespec(self):
# Default routespec for the Hub is the *app* base url
# not the hub URL, so the Hub receives requests for non-running servers
# use `/` with host-based routing so the Hub
# gets requests for all hosts
if self.subdomain_host:
routespec = '/'
else:
routespec = self.base_url
return routespec
@validate("hub_routespec")
def _validate_hub_routespec(self, proposal):
"""ensure leading/trailing / on custom routespec prefix
- trailing '/' always required
- leading '/' required unless using subdomains
"""
routespec = proposal.value
if not routespec.endswith("/"):
routespec = routespec + "/"
if not self.subdomain_host and not routespec.startswith("/"):
routespec = "/" + routespec
return routespec
@observe("hub_routespec")
def _hub_routespec_changed(self, change):
if change.new == change.old:
return
routespec = change.new
if routespec not in {'/', self.base_url}:
self.log.warning(
f"Using custom route for Hub: {routespec}."
" Requests for not-running servers may not be handled."
)
@observe('base_url')
def _update_hub_prefix(self, change):
"""add base URL to hub prefix"""
self.hub_prefix = self._hub_prefix_default()
trust_user_provided_tokens = Bool(
False,
help="""Trust user-provided tokens (via JupyterHub.service_tokens)
to have good entropy.
If you are not inserting additional tokens via configuration file,
this flag has no effect.
In JupyterHub 0.8, internally generated tokens do not
pass through additional hashing because the hashing is costly
and does not increase the entropy of already-good UUIDs.
User-provided tokens, on the other hand, are not trusted to have good entropy by default,
and are passed through many rounds of hashing to stretch the entropy of the key
(i.e. user-provided tokens are treated as passwords instead of random keys).
These keys are more costly to check.
If your inserted tokens are generated by a good-quality mechanism,
e.g. `openssl rand -hex 32`, then you can set this flag to True
to reduce the cost of checking authentication tokens.
""",
).tag(config=True)
cookie_secret = Union(
[Bytes(), Unicode()],
help="""The cookie secret to use to encrypt cookies.
Loaded from the JPY_COOKIE_SECRET env variable by default.
Should be exactly 256 bits (32 bytes).
""",
).tag(config=True, env='JPY_COOKIE_SECRET')
@validate('cookie_secret')