#!/usr/bin/env python
# -*- coding: utf-8 -*-
###############################################################################
# Copyright 2013 Kitware Inc.
#
# Licensed under the Apache License, Version 2.0 ( the "License" );
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
###############################################################################
import datetime
import six
import string
from girder.constants import AccessType, TerminalColor, TokenScope
from .model_base import AccessControlledModel
try:
from random import SystemRandom
random = SystemRandom()
random.random() # potentially raises NotImplementedError
except NotImplementedError: # pragma: no cover
print(TerminalColor.warning(
'WARNING: using non-cryptographically secure PRNG.'))
import random
[docs]def genToken(length=64):
"""
Use this utility function to generate a random string of
a desired length.
"""
return ''.join(random.choice(string.ascii_letters + string.digits)
for x in range(length))
[docs]class Token(AccessControlledModel):
"""
This model stores session tokens for user authentication.
"""
def initialize(self):
self.name = 'token'
self.ensureIndex(('expires', {'expireAfterSeconds': 0}))
def validate(self, doc):
return doc
[docs] def createToken(self, user=None, days=180, scope=None):
"""
Creates a new token. You can create an anonymous token
(such as for CSRF mitigation) by passing "None" for the user argument.
:param user: The user to create the session for.
:type user: dict
:param days: The lifespan of the session in days.
:type days: int
:param scope: Scope or list of scopes this token applies to. By default,
will create a user authentication token.
:type scope: str or list of str
:returns: The token document that was created.
"""
now = datetime.datetime.utcnow()
if scope is None:
scope = (TokenScope.USER_AUTH,)
elif isinstance(scope, six.string_types):
scope = (scope,)
token = {
'_id': genToken(),
'created': now,
'expires': now + datetime.timedelta(days=days),
'scope': list(set(scope))
}
if user is None:
# Since these tokens don't correspond to a user, we want to be
# able to load them by their value without passing a user or
# force=True, so we set it to public access. This is OK since tokens
# are not exposed externally for listing, and the _id is the secure
# token value.
self.setPublic(token, True)
else:
token['userId'] = user['_id']
self.setUserAccess(token, user=user, level=AccessType.ADMIN)
return self.save(token)
[docs] def addScope(self, token, scope):
"""
Add a scope to this token. If the token already has the scope, this is
a no-op.
"""
if 'scope' not in token:
token['scope'] = []
if scope not in token['scope']:
token['scope'].append(scope)
token = self.save(token)
return token
[docs] def getAllowedScopes(self, token):
"""
Return the list of allowed scopes for a given token.
"""
return token.get('scope', (TokenScope.USER_AUTH,))
[docs] def hasScope(self, token, scope):
"""
Test whether the given token has the given set of scopes. Use this
rather than comparing manually, since this method is backward
compatible with tokens that do not contain a scope field.
:param token: The token object.
:type token: dict
:param scope: A scope or set of scopes that will be tested as a subset
of the given token's allowed scopes.
:type scope: str or list of str
"""
if isinstance(scope, six.string_types):
scope = (scope,)
return set(scope).issubset(set(self.getAllowedScopes(token)))