bbf6d9b026
Bugfix for feeds
- removed categories related and up
- load new books now working
- category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
324 lines
12 KiB
Python
324 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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r"""
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werkzeug.contrib.securecookie
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This module implements a cookie that is not alterable from the client
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because it adds a checksum the server checks for. You can use it as
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session replacement if all you have is a user id or something to mark
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a logged in user.
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Keep in mind that the data is still readable from the client as a
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normal cookie is. However you don't have to store and flush the
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sessions you have at the server.
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Example usage:
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>>> from werkzeug.contrib.securecookie import SecureCookie
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>>> x = SecureCookie({"foo": 42, "baz": (1, 2, 3)}, "deadbeef")
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Dumping into a string so that one can store it in a cookie:
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>>> value = x.serialize()
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Loading from that string again:
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>>> x = SecureCookie.unserialize(value, "deadbeef")
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>>> x["baz"]
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(1, 2, 3)
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If someone modifies the cookie and the checksum is wrong the unserialize
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method will fail silently and return a new empty `SecureCookie` object.
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Keep in mind that the values will be visible in the cookie so do not
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store data in a cookie you don't want the user to see.
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Application Integration
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=======================
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If you are using the werkzeug request objects you could integrate the
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secure cookie into your application like this::
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from werkzeug.utils import cached_property
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from werkzeug.wrappers import BaseRequest
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from werkzeug.contrib.securecookie import SecureCookie
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# don't use this key but a different one; you could just use
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# os.urandom(20) to get something random
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SECRET_KEY = '\xfa\xdd\xb8z\xae\xe0}4\x8b\xea'
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class Request(BaseRequest):
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@cached_property
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def client_session(self):
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data = self.cookies.get('session_data')
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if not data:
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return SecureCookie(secret_key=SECRET_KEY)
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return SecureCookie.unserialize(data, SECRET_KEY)
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def application(environ, start_response):
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request = Request(environ, start_response)
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# get a response object here
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response = ...
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if request.client_session.should_save:
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session_data = request.client_session.serialize()
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response.set_cookie('session_data', session_data,
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httponly=True)
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return response(environ, start_response)
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A less verbose integration can be achieved by using shorthand methods::
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class Request(BaseRequest):
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@cached_property
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def client_session(self):
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return SecureCookie.load_cookie(self, secret_key=COOKIE_SECRET)
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def application(environ, start_response):
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request = Request(environ, start_response)
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# get a response object here
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response = ...
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request.client_session.save_cookie(response)
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return response(environ, start_response)
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:copyright: (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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"""
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import pickle
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import base64
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from hmac import new as hmac
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from time import time
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from hashlib import sha1 as _default_hash
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from werkzeug._compat import iteritems, text_type
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from werkzeug.urls import url_quote_plus, url_unquote_plus
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from werkzeug._internal import _date_to_unix
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from werkzeug.contrib.sessions import ModificationTrackingDict
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from werkzeug.security import safe_str_cmp
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from werkzeug._compat import to_native
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class UnquoteError(Exception):
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"""Internal exception used to signal failures on quoting."""
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class SecureCookie(ModificationTrackingDict):
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"""Represents a secure cookie. You can subclass this class and provide
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an alternative mac method. The import thing is that the mac method
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is a function with a similar interface to the hashlib. Required
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methods are update() and digest().
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Example usage:
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>>> x = SecureCookie({"foo": 42, "baz": (1, 2, 3)}, "deadbeef")
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>>> x["foo"]
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42
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>>> x["baz"]
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(1, 2, 3)
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>>> x["blafasel"] = 23
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>>> x.should_save
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True
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:param data: the initial data. Either a dict, list of tuples or `None`.
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:param secret_key: the secret key. If not set `None` or not specified
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it has to be set before :meth:`serialize` is called.
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:param new: The initial value of the `new` flag.
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"""
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#: The hash method to use. This has to be a module with a new function
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#: or a function that creates a hashlib object. Such as `hashlib.md5`
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#: Subclasses can override this attribute. The default hash is sha1.
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#: Make sure to wrap this in staticmethod() if you store an arbitrary
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#: function there such as hashlib.sha1 which might be implemented
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#: as a function.
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hash_method = staticmethod(_default_hash)
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#: the module used for serialization. Unless overriden by subclasses
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#: the standard pickle module is used.
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serialization_method = pickle
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#: if the contents should be base64 quoted. This can be disabled if the
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#: serialization process returns cookie safe strings only.
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quote_base64 = True
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def __init__(self, data=None, secret_key=None, new=True):
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ModificationTrackingDict.__init__(self, data or ())
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# explicitly convert it into a bytestring because python 2.6
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# no longer performs an implicit string conversion on hmac
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if secret_key is not None:
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secret_key = bytes(secret_key)
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self.secret_key = secret_key
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self.new = new
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def __repr__(self):
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return '<%s %s%s>' % (
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self.__class__.__name__,
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dict.__repr__(self),
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self.should_save and '*' or ''
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)
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@property
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def should_save(self):
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"""True if the session should be saved. By default this is only true
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for :attr:`modified` cookies, not :attr:`new`.
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"""
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return self.modified
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@classmethod
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def quote(cls, value):
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"""Quote the value for the cookie. This can be any object supported
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by :attr:`serialization_method`.
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:param value: the value to quote.
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"""
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if cls.serialization_method is not None:
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value = cls.serialization_method.dumps(value)
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if cls.quote_base64:
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value = b''.join(base64.b64encode(value).splitlines()).strip()
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return value
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@classmethod
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def unquote(cls, value):
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"""Unquote the value for the cookie. If unquoting does not work a
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:exc:`UnquoteError` is raised.
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:param value: the value to unquote.
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"""
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try:
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if cls.quote_base64:
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value = base64.b64decode(value)
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if cls.serialization_method is not None:
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value = cls.serialization_method.loads(value)
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return value
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except Exception:
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# unfortunately pickle and other serialization modules can
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# cause pretty every error here. if we get one we catch it
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# and convert it into an UnquoteError
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raise UnquoteError()
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def serialize(self, expires=None):
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"""Serialize the secure cookie into a string.
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If expires is provided, the session will be automatically invalidated
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after expiration when you unseralize it. This provides better
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protection against session cookie theft.
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:param expires: an optional expiration date for the cookie (a
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:class:`datetime.datetime` object)
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"""
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if self.secret_key is None:
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raise RuntimeError('no secret key defined')
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if expires:
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self['_expires'] = _date_to_unix(expires)
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result = []
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mac = hmac(self.secret_key, None, self.hash_method)
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for key, value in sorted(self.items()):
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result.append(('%s=%s' % (
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url_quote_plus(key),
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self.quote(value).decode('ascii')
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)).encode('ascii'))
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mac.update(b'|' + result[-1])
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return b'?'.join([
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base64.b64encode(mac.digest()).strip(),
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b'&'.join(result)
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])
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@classmethod
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def unserialize(cls, string, secret_key):
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"""Load the secure cookie from a serialized string.
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:param string: the cookie value to unserialize.
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:param secret_key: the secret key used to serialize the cookie.
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:return: a new :class:`SecureCookie`.
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"""
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if isinstance(string, text_type):
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string = string.encode('utf-8', 'replace')
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if isinstance(secret_key, text_type):
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secret_key = secret_key.encode('utf-8', 'replace')
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try:
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base64_hash, data = string.split(b'?', 1)
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except (ValueError, IndexError):
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items = ()
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else:
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items = {}
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mac = hmac(secret_key, None, cls.hash_method)
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for item in data.split(b'&'):
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mac.update(b'|' + item)
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if b'=' not in item:
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items = None
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break
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key, value = item.split(b'=', 1)
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# try to make the key a string
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key = url_unquote_plus(key.decode('ascii'))
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try:
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key = to_native(key)
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except UnicodeError:
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pass
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items[key] = value
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# no parsing error and the mac looks okay, we can now
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# sercurely unpickle our cookie.
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try:
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client_hash = base64.b64decode(base64_hash)
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except TypeError:
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items = client_hash = None
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if items is not None and safe_str_cmp(client_hash, mac.digest()):
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try:
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for key, value in iteritems(items):
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items[key] = cls.unquote(value)
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except UnquoteError:
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items = ()
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else:
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if '_expires' in items:
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if time() > items['_expires']:
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items = ()
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else:
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del items['_expires']
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else:
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items = ()
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return cls(items, secret_key, False)
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@classmethod
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def load_cookie(cls, request, key='session', secret_key=None):
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"""Loads a :class:`SecureCookie` from a cookie in request. If the
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cookie is not set, a new :class:`SecureCookie` instanced is
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returned.
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:param request: a request object that has a `cookies` attribute
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which is a dict of all cookie values.
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:param key: the name of the cookie.
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:param secret_key: the secret key used to unquote the cookie.
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Always provide the value even though it has
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no default!
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"""
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data = request.cookies.get(key)
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if not data:
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return cls(secret_key=secret_key)
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return cls.unserialize(data, secret_key)
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def save_cookie(self, response, key='session', expires=None,
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session_expires=None, max_age=None, path='/', domain=None,
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secure=None, httponly=False, force=False):
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"""Saves the SecureCookie in a cookie on response object. All
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parameters that are not described here are forwarded directly
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to :meth:`~BaseResponse.set_cookie`.
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:param response: a response object that has a
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:meth:`~BaseResponse.set_cookie` method.
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:param key: the name of the cookie.
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:param session_expires: the expiration date of the secure cookie
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stored information. If this is not provided
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the cookie `expires` date is used instead.
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"""
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if force or self.should_save:
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data = self.serialize(session_expires or expires)
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response.set_cookie(key, data, expires=expires, max_age=max_age,
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path=path, domain=domain, secure=secure,
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httponly=httponly)
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