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
363 lines
14 KiB
Python
363 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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"""
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flask.sessions
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~~~~~~~~~~~~~~
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Implements cookie based sessions based on itsdangerous.
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:copyright: (c) 2015 by Armin Ronacher.
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:license: BSD, see LICENSE for more details.
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"""
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import uuid
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import hashlib
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from base64 import b64encode, b64decode
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from datetime import datetime
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from werkzeug.http import http_date, parse_date
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from werkzeug.datastructures import CallbackDict
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from . import Markup, json
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from ._compat import iteritems, text_type
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from .helpers import total_seconds
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from itsdangerous import URLSafeTimedSerializer, BadSignature
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class SessionMixin(object):
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"""Expands a basic dictionary with an accessors that are expected
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by Flask extensions and users for the session.
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"""
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def _get_permanent(self):
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return self.get('_permanent', False)
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def _set_permanent(self, value):
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self['_permanent'] = bool(value)
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#: this reflects the ``'_permanent'`` key in the dict.
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permanent = property(_get_permanent, _set_permanent)
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del _get_permanent, _set_permanent
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#: some session backends can tell you if a session is new, but that is
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#: not necessarily guaranteed. Use with caution. The default mixin
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#: implementation just hardcodes ``False`` in.
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new = False
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#: for some backends this will always be ``True``, but some backends will
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#: default this to false and detect changes in the dictionary for as
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#: long as changes do not happen on mutable structures in the session.
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#: The default mixin implementation just hardcodes ``True`` in.
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modified = True
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def _tag(value):
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if isinstance(value, tuple):
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return {' t': [_tag(x) for x in value]}
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elif isinstance(value, uuid.UUID):
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return {' u': value.hex}
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elif isinstance(value, bytes):
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return {' b': b64encode(value).decode('ascii')}
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elif callable(getattr(value, '__html__', None)):
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return {' m': text_type(value.__html__())}
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elif isinstance(value, list):
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return [_tag(x) for x in value]
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elif isinstance(value, datetime):
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return {' d': http_date(value)}
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elif isinstance(value, dict):
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return dict((k, _tag(v)) for k, v in iteritems(value))
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elif isinstance(value, str):
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try:
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return text_type(value)
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except UnicodeError:
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from flask.debughelpers import UnexpectedUnicodeError
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raise UnexpectedUnicodeError(u'A byte string with '
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u'non-ASCII data was passed to the session system '
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u'which can only store unicode strings. Consider '
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u'base64 encoding your string (String was %r)' % value)
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return value
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class TaggedJSONSerializer(object):
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"""A customized JSON serializer that supports a few extra types that
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we take for granted when serializing (tuples, markup objects, datetime).
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"""
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def dumps(self, value):
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return json.dumps(_tag(value), separators=(',', ':'))
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def loads(self, value):
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def object_hook(obj):
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if len(obj) != 1:
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return obj
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the_key, the_value = next(iteritems(obj))
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if the_key == ' t':
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return tuple(the_value)
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elif the_key == ' u':
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return uuid.UUID(the_value)
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elif the_key == ' b':
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return b64decode(the_value)
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elif the_key == ' m':
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return Markup(the_value)
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elif the_key == ' d':
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return parse_date(the_value)
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return obj
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return json.loads(value, object_hook=object_hook)
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session_json_serializer = TaggedJSONSerializer()
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class SecureCookieSession(CallbackDict, SessionMixin):
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"""Base class for sessions based on signed cookies."""
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def __init__(self, initial=None):
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def on_update(self):
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self.modified = True
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CallbackDict.__init__(self, initial, on_update)
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self.modified = False
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class NullSession(SecureCookieSession):
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"""Class used to generate nicer error messages if sessions are not
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available. Will still allow read-only access to the empty session
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but fail on setting.
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"""
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def _fail(self, *args, **kwargs):
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raise RuntimeError('The session is unavailable because no secret '
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'key was set. Set the secret_key on the '
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'application to something unique and secret.')
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__setitem__ = __delitem__ = clear = pop = popitem = \
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update = setdefault = _fail
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del _fail
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class SessionInterface(object):
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"""The basic interface you have to implement in order to replace the
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default session interface which uses werkzeug's securecookie
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implementation. The only methods you have to implement are
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:meth:`open_session` and :meth:`save_session`, the others have
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useful defaults which you don't need to change.
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The session object returned by the :meth:`open_session` method has to
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provide a dictionary like interface plus the properties and methods
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from the :class:`SessionMixin`. We recommend just subclassing a dict
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and adding that mixin::
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class Session(dict, SessionMixin):
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pass
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If :meth:`open_session` returns ``None`` Flask will call into
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:meth:`make_null_session` to create a session that acts as replacement
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if the session support cannot work because some requirement is not
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fulfilled. The default :class:`NullSession` class that is created
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will complain that the secret key was not set.
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To replace the session interface on an application all you have to do
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is to assign :attr:`flask.Flask.session_interface`::
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app = Flask(__name__)
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app.session_interface = MySessionInterface()
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.. versionadded:: 0.8
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"""
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#: :meth:`make_null_session` will look here for the class that should
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#: be created when a null session is requested. Likewise the
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#: :meth:`is_null_session` method will perform a typecheck against
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#: this type.
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null_session_class = NullSession
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#: A flag that indicates if the session interface is pickle based.
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#: This can be used by flask extensions to make a decision in regards
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#: to how to deal with the session object.
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#:
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#: .. versionadded:: 0.10
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pickle_based = False
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def make_null_session(self, app):
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"""Creates a null session which acts as a replacement object if the
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real session support could not be loaded due to a configuration
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error. This mainly aids the user experience because the job of the
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null session is to still support lookup without complaining but
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modifications are answered with a helpful error message of what
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failed.
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This creates an instance of :attr:`null_session_class` by default.
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"""
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return self.null_session_class()
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def is_null_session(self, obj):
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"""Checks if a given object is a null session. Null sessions are
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not asked to be saved.
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This checks if the object is an instance of :attr:`null_session_class`
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by default.
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"""
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return isinstance(obj, self.null_session_class)
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def get_cookie_domain(self, app):
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"""Helpful helper method that returns the cookie domain that should
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be used for the session cookie if session cookies are used.
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"""
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if app.config['SESSION_COOKIE_DOMAIN'] is not None:
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return app.config['SESSION_COOKIE_DOMAIN']
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if app.config['SERVER_NAME'] is not None:
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# chop off the port which is usually not supported by browsers
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rv = '.' + app.config['SERVER_NAME'].rsplit(':', 1)[0]
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# Google chrome does not like cookies set to .localhost, so
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# we just go with no domain then. Flask documents anyways that
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# cross domain cookies need a fully qualified domain name
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if rv == '.localhost':
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rv = None
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# If we infer the cookie domain from the server name we need
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# to check if we are in a subpath. In that case we can't
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# set a cross domain cookie.
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if rv is not None:
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path = self.get_cookie_path(app)
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if path != '/':
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rv = rv.lstrip('.')
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return rv
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def get_cookie_path(self, app):
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"""Returns the path for which the cookie should be valid. The
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default implementation uses the value from the ``SESSION_COOKIE_PATH``
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config var if it's set, and falls back to ``APPLICATION_ROOT`` or
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uses ``/`` if it's ``None``.
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"""
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return app.config['SESSION_COOKIE_PATH'] or \
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app.config['APPLICATION_ROOT'] or '/'
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def get_cookie_httponly(self, app):
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"""Returns True if the session cookie should be httponly. This
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currently just returns the value of the ``SESSION_COOKIE_HTTPONLY``
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config var.
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"""
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return app.config['SESSION_COOKIE_HTTPONLY']
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def get_cookie_secure(self, app):
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"""Returns True if the cookie should be secure. This currently
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just returns the value of the ``SESSION_COOKIE_SECURE`` setting.
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"""
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return app.config['SESSION_COOKIE_SECURE']
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def get_expiration_time(self, app, session):
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"""A helper method that returns an expiration date for the session
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or ``None`` if the session is linked to the browser session. The
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default implementation returns now + the permanent session
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lifetime configured on the application.
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"""
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if session.permanent:
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return datetime.utcnow() + app.permanent_session_lifetime
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def should_set_cookie(self, app, session):
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"""Indicates whether a cookie should be set now or not. This is
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used by session backends to figure out if they should emit a
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set-cookie header or not. The default behavior is controlled by
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the ``SESSION_REFRESH_EACH_REQUEST`` config variable. If
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it's set to ``False`` then a cookie is only set if the session is
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modified, if set to ``True`` it's always set if the session is
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permanent.
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This check is usually skipped if sessions get deleted.
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.. versionadded:: 0.11
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"""
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if session.modified:
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return True
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save_each = app.config['SESSION_REFRESH_EACH_REQUEST']
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return save_each and session.permanent
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def open_session(self, app, request):
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"""This method has to be implemented and must either return ``None``
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in case the loading failed because of a configuration error or an
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instance of a session object which implements a dictionary like
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interface + the methods and attributes on :class:`SessionMixin`.
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"""
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raise NotImplementedError()
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def save_session(self, app, session, response):
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"""This is called for actual sessions returned by :meth:`open_session`
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at the end of the request. This is still called during a request
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context so if you absolutely need access to the request you can do
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that.
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"""
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raise NotImplementedError()
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class SecureCookieSessionInterface(SessionInterface):
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"""The default session interface that stores sessions in signed cookies
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through the :mod:`itsdangerous` module.
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"""
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#: the salt that should be applied on top of the secret key for the
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#: signing of cookie based sessions.
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salt = 'cookie-session'
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#: the hash function to use for the signature. The default is sha1
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digest_method = staticmethod(hashlib.sha1)
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#: the name of the itsdangerous supported key derivation. The default
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#: is hmac.
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key_derivation = 'hmac'
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#: A python serializer for the payload. The default is a compact
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#: JSON derived serializer with support for some extra Python types
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#: such as datetime objects or tuples.
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serializer = session_json_serializer
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session_class = SecureCookieSession
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def get_signing_serializer(self, app):
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if not app.secret_key:
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return None
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signer_kwargs = dict(
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key_derivation=self.key_derivation,
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digest_method=self.digest_method
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)
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return URLSafeTimedSerializer(app.secret_key, salt=self.salt,
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serializer=self.serializer,
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signer_kwargs=signer_kwargs)
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def open_session(self, app, request):
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s = self.get_signing_serializer(app)
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if s is None:
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return None
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val = request.cookies.get(app.session_cookie_name)
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if not val:
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return self.session_class()
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max_age = total_seconds(app.permanent_session_lifetime)
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try:
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data = s.loads(val, max_age=max_age)
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return self.session_class(data)
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except BadSignature:
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return self.session_class()
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def save_session(self, app, session, response):
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domain = self.get_cookie_domain(app)
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path = self.get_cookie_path(app)
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# Delete case. If there is no session we bail early.
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# If the session was modified to be empty we remove the
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# whole cookie.
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if not session:
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if session.modified:
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response.delete_cookie(app.session_cookie_name,
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domain=domain, path=path)
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return
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# Modification case. There are upsides and downsides to
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# emitting a set-cookie header each request. The behavior
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# is controlled by the :meth:`should_set_cookie` method
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# which performs a quick check to figure out if the cookie
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# should be set or not. This is controlled by the
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# SESSION_REFRESH_EACH_REQUEST config flag as well as
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# the permanent flag on the session itself.
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if not self.should_set_cookie(app, session):
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return
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httponly = self.get_cookie_httponly(app)
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secure = self.get_cookie_secure(app)
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expires = self.get_expiration_time(app, session)
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val = self.get_signing_serializer(app).dumps(dict(session))
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response.set_cookie(app.session_cookie_name, val,
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expires=expires, httponly=httponly,
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domain=domain, path=path, secure=secure)
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