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
353 lines
12 KiB
Python
353 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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r"""
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werkzeug.contrib.sessions
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~~~~~~~~~~~~~~~~~~~~~~~~~
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This module contains some helper classes that help one to add session
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support to a python WSGI application. For full client-side session
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storage see :mod:`~werkzeug.contrib.securecookie` which implements a
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secure, client-side session storage.
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Application Integration
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=======================
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::
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from werkzeug.contrib.sessions import SessionMiddleware, \
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FilesystemSessionStore
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app = SessionMiddleware(app, FilesystemSessionStore())
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The current session will then appear in the WSGI environment as
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`werkzeug.session`. However it's recommended to not use the middleware
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but the stores directly in the application. However for very simple
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scripts a middleware for sessions could be sufficient.
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This module does not implement methods or ways to check if a session is
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expired. That should be done by a cronjob and storage specific. For
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example to prune unused filesystem sessions one could check the modified
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time of the files. It sessions are stored in the database the new()
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method should add an expiration timestamp for the session.
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For better flexibility it's recommended to not use the middleware but the
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store and session object directly in the application dispatching::
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session_store = FilesystemSessionStore()
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def application(environ, start_response):
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request = Request(environ)
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sid = request.cookies.get('cookie_name')
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if sid is None:
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request.session = session_store.new()
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else:
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request.session = session_store.get(sid)
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response = get_the_response_object(request)
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if request.session.should_save:
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session_store.save(request.session)
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response.set_cookie('cookie_name', request.session.sid)
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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 re
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import os
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import tempfile
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from os import path
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from time import time
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from random import random
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from hashlib import sha1
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from pickle import dump, load, HIGHEST_PROTOCOL
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from werkzeug.datastructures import CallbackDict
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from werkzeug.utils import dump_cookie, parse_cookie
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from werkzeug.wsgi import ClosingIterator
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from werkzeug.posixemulation import rename
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from werkzeug._compat import PY2, text_type
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from werkzeug.filesystem import get_filesystem_encoding
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_sha1_re = re.compile(r'^[a-f0-9]{40}$')
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def _urandom():
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if hasattr(os, 'urandom'):
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return os.urandom(30)
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return text_type(random()).encode('ascii')
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def generate_key(salt=None):
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if salt is None:
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salt = repr(salt).encode('ascii')
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return sha1(b''.join([
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salt,
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str(time()).encode('ascii'),
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_urandom()
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])).hexdigest()
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class ModificationTrackingDict(CallbackDict):
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__slots__ = ('modified',)
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def __init__(self, *args, **kwargs):
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def on_update(self):
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self.modified = True
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self.modified = False
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CallbackDict.__init__(self, on_update=on_update)
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dict.update(self, *args, **kwargs)
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def copy(self):
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"""Create a flat copy of the dict."""
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missing = object()
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result = object.__new__(self.__class__)
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for name in self.__slots__:
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val = getattr(self, name, missing)
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if val is not missing:
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setattr(result, name, val)
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return result
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def __copy__(self):
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return self.copy()
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class Session(ModificationTrackingDict):
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"""Subclass of a dict that keeps track of direct object changes. Changes
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in mutable structures are not tracked, for those you have to set
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`modified` to `True` by hand.
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"""
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__slots__ = ModificationTrackingDict.__slots__ + ('sid', 'new')
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def __init__(self, data, sid, new=False):
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ModificationTrackingDict.__init__(self, data)
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self.sid = sid
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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.
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.. versionchanged:: 0.6
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By default the session is now only saved if the session is
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modified, not if it is new like it was before.
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"""
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return self.modified
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class SessionStore(object):
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"""Baseclass for all session stores. The Werkzeug contrib module does not
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implement any useful stores besides the filesystem store, application
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developers are encouraged to create their own stores.
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:param session_class: The session class to use. Defaults to
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:class:`Session`.
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"""
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def __init__(self, session_class=None):
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if session_class is None:
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session_class = Session
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self.session_class = session_class
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def is_valid_key(self, key):
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"""Check if a key has the correct format."""
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return _sha1_re.match(key) is not None
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def generate_key(self, salt=None):
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"""Simple function that generates a new session key."""
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return generate_key(salt)
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def new(self):
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"""Generate a new session."""
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return self.session_class({}, self.generate_key(), True)
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def save(self, session):
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"""Save a session."""
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def save_if_modified(self, session):
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"""Save if a session class wants an update."""
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if session.should_save:
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self.save(session)
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def delete(self, session):
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"""Delete a session."""
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def get(self, sid):
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"""Get a session for this sid or a new session object. This method
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has to check if the session key is valid and create a new session if
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that wasn't the case.
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"""
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return self.session_class({}, sid, True)
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#: used for temporary files by the filesystem session store
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_fs_transaction_suffix = '.__wz_sess'
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class FilesystemSessionStore(SessionStore):
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"""Simple example session store that saves sessions on the filesystem.
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This store works best on POSIX systems and Windows Vista / Windows
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Server 2008 and newer.
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.. versionchanged:: 0.6
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`renew_missing` was added. Previously this was considered `True`,
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now the default changed to `False` and it can be explicitly
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deactivated.
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:param path: the path to the folder used for storing the sessions.
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If not provided the default temporary directory is used.
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:param filename_template: a string template used to give the session
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a filename. ``%s`` is replaced with the
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session id.
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:param session_class: The session class to use. Defaults to
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:class:`Session`.
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:param renew_missing: set to `True` if you want the store to
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give the user a new sid if the session was
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not yet saved.
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"""
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def __init__(self, path=None, filename_template='werkzeug_%s.sess',
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session_class=None, renew_missing=False, mode=0o644):
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SessionStore.__init__(self, session_class)
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if path is None:
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path = tempfile.gettempdir()
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self.path = path
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if isinstance(filename_template, text_type) and PY2:
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filename_template = filename_template.encode(
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get_filesystem_encoding())
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assert not filename_template.endswith(_fs_transaction_suffix), \
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'filename templates may not end with %s' % _fs_transaction_suffix
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self.filename_template = filename_template
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self.renew_missing = renew_missing
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self.mode = mode
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def get_session_filename(self, sid):
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# out of the box, this should be a strict ASCII subset but
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# you might reconfigure the session object to have a more
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# arbitrary string.
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if isinstance(sid, text_type) and PY2:
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sid = sid.encode(get_filesystem_encoding())
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return path.join(self.path, self.filename_template % sid)
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def save(self, session):
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fn = self.get_session_filename(session.sid)
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fd, tmp = tempfile.mkstemp(suffix=_fs_transaction_suffix,
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dir=self.path)
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f = os.fdopen(fd, 'wb')
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try:
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dump(dict(session), f, HIGHEST_PROTOCOL)
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finally:
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f.close()
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try:
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rename(tmp, fn)
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os.chmod(fn, self.mode)
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except (IOError, OSError):
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pass
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def delete(self, session):
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fn = self.get_session_filename(session.sid)
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try:
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os.unlink(fn)
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except OSError:
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pass
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def get(self, sid):
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if not self.is_valid_key(sid):
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return self.new()
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try:
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f = open(self.get_session_filename(sid), 'rb')
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except IOError:
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if self.renew_missing:
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return self.new()
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data = {}
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else:
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try:
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try:
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data = load(f)
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except Exception:
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data = {}
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finally:
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f.close()
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return self.session_class(data, sid, False)
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def list(self):
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"""Lists all sessions in the store.
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.. versionadded:: 0.6
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"""
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before, after = self.filename_template.split('%s', 1)
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filename_re = re.compile(r'%s(.{5,})%s$' % (re.escape(before),
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re.escape(after)))
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result = []
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for filename in os.listdir(self.path):
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#: this is a session that is still being saved.
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if filename.endswith(_fs_transaction_suffix):
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continue
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match = filename_re.match(filename)
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if match is not None:
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result.append(match.group(1))
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return result
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class SessionMiddleware(object):
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"""A simple middleware that puts the session object of a store provided
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into the WSGI environ. It automatically sets cookies and restores
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sessions.
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However a middleware is not the preferred solution because it won't be as
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fast as sessions managed by the application itself and will put a key into
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the WSGI environment only relevant for the application which is against
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the concept of WSGI.
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The cookie parameters are the same as for the :func:`~dump_cookie`
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function just prefixed with ``cookie_``. Additionally `max_age` is
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called `cookie_age` and not `cookie_max_age` because of backwards
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compatibility.
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"""
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def __init__(self, app, store, cookie_name='session_id',
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cookie_age=None, cookie_expires=None, cookie_path='/',
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cookie_domain=None, cookie_secure=None,
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cookie_httponly=False, environ_key='werkzeug.session'):
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self.app = app
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self.store = store
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self.cookie_name = cookie_name
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self.cookie_age = cookie_age
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self.cookie_expires = cookie_expires
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self.cookie_path = cookie_path
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self.cookie_domain = cookie_domain
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self.cookie_secure = cookie_secure
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self.cookie_httponly = cookie_httponly
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self.environ_key = environ_key
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def __call__(self, environ, start_response):
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cookie = parse_cookie(environ.get('HTTP_COOKIE', ''))
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sid = cookie.get(self.cookie_name, None)
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if sid is None:
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session = self.store.new()
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else:
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session = self.store.get(sid)
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environ[self.environ_key] = session
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def injecting_start_response(status, headers, exc_info=None):
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if session.should_save:
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self.store.save(session)
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headers.append(('Set-Cookie', dump_cookie(self.cookie_name,
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session.sid, self.cookie_age,
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self.cookie_expires, self.cookie_path,
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self.cookie_domain, self.cookie_secure,
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self.cookie_httponly)))
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return start_response(status, headers, exc_info)
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return ClosingIterator(self.app(environ, injecting_start_response),
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lambda: self.store.save_if_modified(session))
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