587 lines
22 KiB
Python
587 lines
22 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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flask_session.sessions
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~~~~~~~~~~~~~~~~~~~~~~
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Server-side Sessions and SessionInterfaces.
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:copyright: (c) 2014 by Shipeng Feng.
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:license: BSD, see LICENSE for more details.
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"""
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import sys
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import time
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from datetime import datetime
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from uuid import uuid4
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try:
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import cPickle as pickle
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except ImportError:
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import pickle
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from flask.sessions import SessionInterface as FlaskSessionInterface
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from flask.sessions import SessionMixin
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from werkzeug.datastructures import CallbackDict
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from itsdangerous import Signer, BadSignature, want_bytes
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PY2 = sys.version_info[0] == 2
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if not PY2:
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text_type = str
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else:
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text_type = unicode
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def total_seconds(td):
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return td.days * 60 * 60 * 24 + td.seconds
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class ServerSideSession(CallbackDict, SessionMixin):
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"""Baseclass for server-side based sessions."""
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def __init__(self, initial=None, sid=None, permanent=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.sid = sid
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if permanent:
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self.permanent = permanent
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self.modified = False
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class RedisSession(ServerSideSession):
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pass
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class MemcachedSession(ServerSideSession):
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pass
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class FileSystemSession(ServerSideSession):
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pass
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class MongoDBSession(ServerSideSession):
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pass
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class SqlAlchemySession(ServerSideSession):
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pass
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class SessionInterface(FlaskSessionInterface):
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def _generate_sid(self):
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return str(uuid4())
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def _get_signer(self, app):
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if not app.secret_key:
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return None
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return Signer(app.secret_key, salt='flask-session',
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key_derivation='hmac')
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class NullSessionInterface(SessionInterface):
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"""Used to open a :class:`flask.sessions.NullSession` instance.
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"""
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def open_session(self, app, request):
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return None
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class RedisSessionInterface(SessionInterface):
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"""Uses the Redis key-value store as a session backend.
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.. versionadded:: 0.2
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The `use_signer` parameter was added.
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:param redis: A ``redis.Redis`` instance.
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:param key_prefix: A prefix that is added to all Redis store keys.
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:param use_signer: Whether to sign the session id cookie or not.
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:param permanent: Whether to use permanent session or not.
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"""
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serializer = pickle
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session_class = RedisSession
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def __init__(self, redis, key_prefix, use_signer=False, permanent=True):
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if redis is None:
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from redis import Redis
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redis = Redis()
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self.redis = redis
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self.key_prefix = key_prefix
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self.use_signer = use_signer
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self.permanent = permanent
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self.has_same_site_capability = hasattr(self, "get_cookie_samesite")
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def open_session(self, app, request):
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sid = request.cookies.get(app.session_cookie_name)
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if not sid:
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sid = self._generate_sid()
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return self.session_class(sid=sid, permanent=self.permanent)
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if self.use_signer:
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signer = self._get_signer(app)
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if signer is None:
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return None
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try:
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sid_as_bytes = signer.unsign(sid)
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sid = sid_as_bytes.decode()
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except BadSignature:
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sid = self._generate_sid()
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return self.session_class(sid=sid, permanent=self.permanent)
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if not PY2 and not isinstance(sid, text_type):
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sid = sid.decode('utf-8', 'strict')
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val = self.redis.get(self.key_prefix + sid)
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if val is not None:
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try:
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data = self.serializer.loads(val)
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return self.session_class(data, sid=sid)
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except:
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return self.session_class(sid=sid, permanent=self.permanent)
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return self.session_class(sid=sid, permanent=self.permanent)
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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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if not session:
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if session.modified:
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self.redis.delete(self.key_prefix + session.sid)
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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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conditional_cookie_kwargs = {}
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httponly = self.get_cookie_httponly(app)
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secure = self.get_cookie_secure(app)
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if self.has_same_site_capability:
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conditional_cookie_kwargs["samesite"] = self.get_cookie_samesite(app)
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expires = self.get_expiration_time(app, session)
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val = self.serializer.dumps(dict(session))
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self.redis.setex(name=self.key_prefix + session.sid, value=val,
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time=total_seconds(app.permanent_session_lifetime))
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if self.use_signer:
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session_id = self._get_signer(app).sign(want_bytes(session.sid))
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else:
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session_id = session.sid
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response.set_cookie(app.session_cookie_name, session_id,
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expires=expires, httponly=httponly,
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domain=domain, path=path, secure=secure,
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**conditional_cookie_kwargs)
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class MemcachedSessionInterface(SessionInterface):
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"""A Session interface that uses memcached as backend.
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.. versionadded:: 0.2
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The `use_signer` parameter was added.
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:param client: A ``memcache.Client`` instance.
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:param key_prefix: A prefix that is added to all Memcached store keys.
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:param use_signer: Whether to sign the session id cookie or not.
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:param permanent: Whether to use permanent session or not.
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"""
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serializer = pickle
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session_class = MemcachedSession
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def __init__(self, client, key_prefix, use_signer=False, permanent=True):
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if client is None:
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client = self._get_preferred_memcache_client()
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if client is None:
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raise RuntimeError('no memcache module found')
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self.client = client
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self.key_prefix = key_prefix
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self.use_signer = use_signer
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self.permanent = permanent
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self.has_same_site_capability = hasattr(self, "get_cookie_samesite")
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def _get_preferred_memcache_client(self):
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servers = ['127.0.0.1:11211']
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try:
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import pylibmc
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except ImportError:
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pass
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else:
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return pylibmc.Client(servers)
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try:
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import memcache
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except ImportError:
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pass
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else:
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return memcache.Client(servers)
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def _get_memcache_timeout(self, timeout):
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"""
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Memcached deals with long (> 30 days) timeouts in a special
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way. Call this function to obtain a safe value for your timeout.
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"""
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if timeout > 2592000: # 60*60*24*30, 30 days
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# See http://code.google.com/p/memcached/wiki/FAQ
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# "You can set expire times up to 30 days in the future. After that
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# memcached interprets it as a date, and will expire the item after
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# said date. This is a simple (but obscure) mechanic."
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#
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# This means that we have to switch to absolute timestamps.
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timeout += int(time.time())
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return timeout
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def open_session(self, app, request):
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sid = request.cookies.get(app.session_cookie_name)
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if not sid:
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sid = self._generate_sid()
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return self.session_class(sid=sid, permanent=self.permanent)
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if self.use_signer:
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signer = self._get_signer(app)
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if signer is None:
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return None
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try:
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sid_as_bytes = signer.unsign(sid)
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sid = sid_as_bytes.decode()
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except BadSignature:
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sid = self._generate_sid()
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return self.session_class(sid=sid, permanent=self.permanent)
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full_session_key = self.key_prefix + sid
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if PY2 and isinstance(full_session_key, unicode):
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full_session_key = full_session_key.encode('utf-8')
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val = self.client.get(full_session_key)
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if val is not None:
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try:
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if not PY2:
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val = want_bytes(val)
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data = self.serializer.loads(val)
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return self.session_class(data, sid=sid)
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except:
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return self.session_class(sid=sid, permanent=self.permanent)
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return self.session_class(sid=sid, permanent=self.permanent)
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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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full_session_key = self.key_prefix + session.sid
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if PY2 and isinstance(full_session_key, unicode):
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full_session_key = full_session_key.encode('utf-8')
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if not session:
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if session.modified:
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self.client.delete(full_session_key)
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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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conditional_cookie_kwargs = {}
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httponly = self.get_cookie_httponly(app)
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secure = self.get_cookie_secure(app)
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if self.has_same_site_capability:
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conditional_cookie_kwargs["samesite"] = self.get_cookie_samesite(app)
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expires = self.get_expiration_time(app, session)
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if not PY2:
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val = self.serializer.dumps(dict(session), 0)
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else:
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val = self.serializer.dumps(dict(session))
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self.client.set(full_session_key, val, self._get_memcache_timeout(
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total_seconds(app.permanent_session_lifetime)))
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if self.use_signer:
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session_id = self._get_signer(app).sign(want_bytes(session.sid))
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else:
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session_id = session.sid
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response.set_cookie(app.session_cookie_name, session_id,
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expires=expires, httponly=httponly,
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domain=domain, path=path, secure=secure,
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**conditional_cookie_kwargs)
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class FileSystemSessionInterface(SessionInterface):
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"""Uses the :class:`cachelib.file.FileSystemCache` as a session backend.
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.. versionadded:: 0.2
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The `use_signer` parameter was added.
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:param cache_dir: the directory where session files are stored.
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:param threshold: the maximum number of items the session stores before it
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starts deleting some.
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:param mode: the file mode wanted for the session files, default 0600
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:param key_prefix: A prefix that is added to FileSystemCache store keys.
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:param use_signer: Whether to sign the session id cookie or not.
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:param permanent: Whether to use permanent session or not.
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"""
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session_class = FileSystemSession
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def __init__(self, cache_dir, threshold, mode, key_prefix,
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use_signer=False, permanent=True):
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from cachelib.file import FileSystemCache
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self.cache = FileSystemCache(cache_dir, threshold=threshold, mode=mode)
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self.key_prefix = key_prefix
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self.use_signer = use_signer
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self.permanent = permanent
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self.has_same_site_capability = hasattr(self, "get_cookie_samesite")
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def open_session(self, app, request):
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sid = request.cookies.get(app.session_cookie_name)
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if not sid:
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sid = self._generate_sid()
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return self.session_class(sid=sid, permanent=self.permanent)
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if self.use_signer:
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signer = self._get_signer(app)
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if signer is None:
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return None
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try:
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sid_as_bytes = signer.unsign(sid)
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sid = sid_as_bytes.decode()
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except BadSignature:
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sid = self._generate_sid()
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return self.session_class(sid=sid, permanent=self.permanent)
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data = self.cache.get(self.key_prefix + sid)
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if data is not None:
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return self.session_class(data, sid=sid)
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return self.session_class(sid=sid, permanent=self.permanent)
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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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if not session:
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if session.modified:
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self.cache.delete(self.key_prefix + session.sid)
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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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conditional_cookie_kwargs = {}
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httponly = self.get_cookie_httponly(app)
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secure = self.get_cookie_secure(app)
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if self.has_same_site_capability:
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conditional_cookie_kwargs["samesite"] = self.get_cookie_samesite(app)
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expires = self.get_expiration_time(app, session)
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data = dict(session)
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self.cache.set(self.key_prefix + session.sid, data,
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total_seconds(app.permanent_session_lifetime))
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if self.use_signer:
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|
|
session_id = self._get_signer(app).sign(want_bytes(session.sid))
|
||
|
|
else:
|
||
|
|
session_id = session.sid
|
||
|
|
response.set_cookie(app.session_cookie_name, session_id,
|
||
|
|
expires=expires, httponly=httponly,
|
||
|
|
domain=domain, path=path, secure=secure,
|
||
|
|
**conditional_cookie_kwargs)
|
||
|
|
|
||
|
|
|
||
|
|
class MongoDBSessionInterface(SessionInterface):
|
||
|
|
"""A Session interface that uses mongodb as backend.
|
||
|
|
|
||
|
|
.. versionadded:: 0.2
|
||
|
|
The `use_signer` parameter was added.
|
||
|
|
|
||
|
|
:param client: A ``pymongo.MongoClient`` instance.
|
||
|
|
:param db: The database you want to use.
|
||
|
|
:param collection: The collection you want to use.
|
||
|
|
:param key_prefix: A prefix that is added to all MongoDB store keys.
|
||
|
|
:param use_signer: Whether to sign the session id cookie or not.
|
||
|
|
:param permanent: Whether to use permanent session or not.
|
||
|
|
"""
|
||
|
|
|
||
|
|
serializer = pickle
|
||
|
|
session_class = MongoDBSession
|
||
|
|
|
||
|
|
def __init__(self, client, db, collection, key_prefix, use_signer=False,
|
||
|
|
permanent=True):
|
||
|
|
if client is None:
|
||
|
|
from pymongo import MongoClient
|
||
|
|
client = MongoClient()
|
||
|
|
self.client = client
|
||
|
|
self.store = client[db][collection]
|
||
|
|
self.key_prefix = key_prefix
|
||
|
|
self.use_signer = use_signer
|
||
|
|
self.permanent = permanent
|
||
|
|
self.has_same_site_capability = hasattr(self, "get_cookie_samesite")
|
||
|
|
|
||
|
|
def open_session(self, app, request):
|
||
|
|
sid = request.cookies.get(app.session_cookie_name)
|
||
|
|
if not sid:
|
||
|
|
sid = self._generate_sid()
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
if self.use_signer:
|
||
|
|
signer = self._get_signer(app)
|
||
|
|
if signer is None:
|
||
|
|
return None
|
||
|
|
try:
|
||
|
|
sid_as_bytes = signer.unsign(sid)
|
||
|
|
sid = sid_as_bytes.decode()
|
||
|
|
except BadSignature:
|
||
|
|
sid = self._generate_sid()
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
|
||
|
|
store_id = self.key_prefix + sid
|
||
|
|
document = self.store.find_one({'id': store_id})
|
||
|
|
if document and document.get('expiration') <= datetime.utcnow():
|
||
|
|
# Delete expired session
|
||
|
|
self.store.remove({'id': store_id})
|
||
|
|
document = None
|
||
|
|
if document is not None:
|
||
|
|
try:
|
||
|
|
val = document['val']
|
||
|
|
data = self.serializer.loads(want_bytes(val))
|
||
|
|
return self.session_class(data, sid=sid)
|
||
|
|
except:
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
|
||
|
|
def save_session(self, app, session, response):
|
||
|
|
domain = self.get_cookie_domain(app)
|
||
|
|
path = self.get_cookie_path(app)
|
||
|
|
store_id = self.key_prefix + session.sid
|
||
|
|
if not session:
|
||
|
|
if session.modified:
|
||
|
|
self.store.remove({'id': store_id})
|
||
|
|
response.delete_cookie(app.session_cookie_name,
|
||
|
|
domain=domain, path=path)
|
||
|
|
return
|
||
|
|
|
||
|
|
conditional_cookie_kwargs = {}
|
||
|
|
httponly = self.get_cookie_httponly(app)
|
||
|
|
secure = self.get_cookie_secure(app)
|
||
|
|
if self.has_same_site_capability:
|
||
|
|
conditional_cookie_kwargs["samesite"] = self.get_cookie_samesite(app)
|
||
|
|
expires = self.get_expiration_time(app, session)
|
||
|
|
val = self.serializer.dumps(dict(session))
|
||
|
|
self.store.update({'id': store_id},
|
||
|
|
{'id': store_id,
|
||
|
|
'val': val,
|
||
|
|
'expiration': expires}, True)
|
||
|
|
if self.use_signer:
|
||
|
|
session_id = self._get_signer(app).sign(want_bytes(session.sid))
|
||
|
|
else:
|
||
|
|
session_id = session.sid
|
||
|
|
response.set_cookie(app.session_cookie_name, session_id,
|
||
|
|
expires=expires, httponly=httponly,
|
||
|
|
domain=domain, path=path, secure=secure,
|
||
|
|
**conditional_cookie_kwargs)
|
||
|
|
|
||
|
|
|
||
|
|
class SqlAlchemySessionInterface(SessionInterface):
|
||
|
|
"""Uses the Flask-SQLAlchemy from a flask app as a session backend.
|
||
|
|
|
||
|
|
.. versionadded:: 0.2
|
||
|
|
|
||
|
|
:param app: A Flask app instance.
|
||
|
|
:param db: A Flask-SQLAlchemy instance.
|
||
|
|
:param table: The table name you want to use.
|
||
|
|
:param key_prefix: A prefix that is added to all store keys.
|
||
|
|
:param use_signer: Whether to sign the session id cookie or not.
|
||
|
|
:param permanent: Whether to use permanent session or not.
|
||
|
|
"""
|
||
|
|
|
||
|
|
serializer = pickle
|
||
|
|
session_class = SqlAlchemySession
|
||
|
|
|
||
|
|
def __init__(self, app, db, table, key_prefix, use_signer=False,
|
||
|
|
permanent=True):
|
||
|
|
if db is None:
|
||
|
|
from flask_sqlalchemy import SQLAlchemy
|
||
|
|
db = SQLAlchemy(app)
|
||
|
|
self.db = db
|
||
|
|
self.key_prefix = key_prefix
|
||
|
|
self.use_signer = use_signer
|
||
|
|
self.permanent = permanent
|
||
|
|
self.has_same_site_capability = hasattr(self, "get_cookie_samesite")
|
||
|
|
|
||
|
|
class Session(self.db.Model):
|
||
|
|
__tablename__ = table
|
||
|
|
|
||
|
|
id = self.db.Column(self.db.Integer, primary_key=True)
|
||
|
|
session_id = self.db.Column(self.db.String(255), unique=True)
|
||
|
|
data = self.db.Column(self.db.LargeBinary)
|
||
|
|
expiry = self.db.Column(self.db.DateTime)
|
||
|
|
|
||
|
|
def __init__(self, session_id, data, expiry):
|
||
|
|
self.session_id = session_id
|
||
|
|
self.data = data
|
||
|
|
self.expiry = expiry
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<Session data %s>' % self.data
|
||
|
|
|
||
|
|
# self.db.create_all()
|
||
|
|
self.sql_session_model = Session
|
||
|
|
|
||
|
|
def open_session(self, app, request):
|
||
|
|
sid = request.cookies.get(app.session_cookie_name)
|
||
|
|
if not sid:
|
||
|
|
sid = self._generate_sid()
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
if self.use_signer:
|
||
|
|
signer = self._get_signer(app)
|
||
|
|
if signer is None:
|
||
|
|
return None
|
||
|
|
try:
|
||
|
|
sid_as_bytes = signer.unsign(sid)
|
||
|
|
sid = sid_as_bytes.decode()
|
||
|
|
except BadSignature:
|
||
|
|
sid = self._generate_sid()
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
|
||
|
|
store_id = self.key_prefix + sid
|
||
|
|
saved_session = self.sql_session_model.query.filter_by(
|
||
|
|
session_id=store_id).first()
|
||
|
|
if saved_session and saved_session.expiry <= datetime.utcnow():
|
||
|
|
# Delete expired session
|
||
|
|
self.db.session.delete(saved_session)
|
||
|
|
self.db.session.commit()
|
||
|
|
saved_session = None
|
||
|
|
if saved_session:
|
||
|
|
try:
|
||
|
|
val = saved_session.data
|
||
|
|
data = self.serializer.loads(want_bytes(val))
|
||
|
|
return self.session_class(data, sid=sid)
|
||
|
|
except:
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
return self.session_class(sid=sid, permanent=self.permanent)
|
||
|
|
|
||
|
|
def save_session(self, app, session, response):
|
||
|
|
domain = self.get_cookie_domain(app)
|
||
|
|
path = self.get_cookie_path(app)
|
||
|
|
store_id = self.key_prefix + session.sid
|
||
|
|
saved_session = self.sql_session_model.query.filter_by(
|
||
|
|
session_id=store_id).first()
|
||
|
|
if not session:
|
||
|
|
if session.modified:
|
||
|
|
if saved_session:
|
||
|
|
self.db.session.delete(saved_session)
|
||
|
|
self.db.session.commit()
|
||
|
|
response.delete_cookie(app.session_cookie_name,
|
||
|
|
domain=domain, path=path)
|
||
|
|
return
|
||
|
|
|
||
|
|
conditional_cookie_kwargs = {}
|
||
|
|
httponly = self.get_cookie_httponly(app)
|
||
|
|
secure = self.get_cookie_secure(app)
|
||
|
|
if self.has_same_site_capability:
|
||
|
|
conditional_cookie_kwargs["samesite"] = self.get_cookie_samesite(app)
|
||
|
|
expires = self.get_expiration_time(app, session)
|
||
|
|
val = self.serializer.dumps(dict(session))
|
||
|
|
if saved_session:
|
||
|
|
saved_session.data = val
|
||
|
|
saved_session.expiry = expires
|
||
|
|
self.db.session.commit()
|
||
|
|
else:
|
||
|
|
new_session = self.sql_session_model(store_id, val, expires)
|
||
|
|
self.db.session.add(new_session)
|
||
|
|
self.db.session.commit()
|
||
|
|
if self.use_signer:
|
||
|
|
session_id = self._get_signer(app).sign(want_bytes(session.sid))
|
||
|
|
else:
|
||
|
|
session_id = session.sid
|
||
|
|
response.set_cookie(app.session_cookie_name, session_id,
|
||
|
|
expires=expires, httponly=httponly,
|
||
|
|
domain=domain, path=path, secure=secure,
|
||
|
|
**conditional_cookie_kwargs)
|