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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Hive Appier Framework
# Copyright (c) 2008-2024 Hive Solutions Lda.
#
# This file is part of Hive Appier Framework.
#
# Hive Appier Framework is free software: you can redistribute it and/or modify
# it under the terms of the Apache License as published by the Apache
# Foundation, either version 2.0 of the License, or (at your option) any
# later version.
#
# Hive Appier Framework is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# Apache License for more details.
#
# You should have received a copy of the Apache License along with
# Hive Appier Framework. If not, see <http://www.apache.org/licenses/>.
__author__ = "João Magalhães <joamag@hive.pt>"
""" The author(s) of the module """
__copyright__ = "Copyright (c) 2008-2024 Hive Solutions Lda."
""" The copyright for the module """
__license__ = "Apache License, Version 2.0"
""" The license for the module """
import os
import time
import uuid
import hmac
import zlib
import pickle
import shelve
import base64
import hashlib
import datetime
from . import config
from . import legacy
from . import redisdb
from . import exceptions
EXPIRE_TIME = datetime.timedelta(days=31)
""" The default expire time to be used in new sessions
in case no expire time is provided to the creation of
the session instance """
class Session(object):
"""
Abstract session class to be used as a reference in
the implementation of the proper classes.
Some of the global functionality may be abstracted
under this class and reused in the concrete classes.
"""
def __init__(
self, name="session", expire=EXPIRE_TIME, sid=None, address=None, growing=True
):
object.__init__(self)
self.sid = sid if sid else self._gen_sid()
self.name = name
self.address = address
self.create = time.time()
self.modify = self.create
self.duration = self._to_seconds(expire)
self.expire = self.create + self.duration
self.growing = growing
self.dirty = True
self.transient = False
self.data_t = dict()
def __len__(self):
return self.data_t.__len__()
def __getitem__(self, key):
return self.data_t.__getitem__(key)
def __setitem__(self, key, value):
self.mark(extend=self.growing)
self.data_t.__setitem__(key, value)
def __delitem__(self, key):
self.mark(extend=self.growing)
self.data_t.__delitem__(key)
def __iter__(self):
return self.data_t.__iter__()
def __contains__(self, item):
return self.data_t.__contains__(item)
def __nonzero__(self):
return True
def __bool__(self):
return True
def __getstate__(self):
return dict(
sid=self.sid,
name=self.name,
address=self.address,
create=self.create,
modify=self.modify,
duration=self.duration,
expire=self.expire,
growing=self.growing,
dirty=self.dirty,
)
def __setstate__(self, state):
for name in (
"sid",
"name",
"address",
"create",
"modify",
"duration",
"expire",
"growing",
"dirty",
):
value = state.get(name, None)
setattr(self, name, value)
self.data_t = dict()
@classmethod
def new(cls, *args, **kwargs):
return cls(*args, **kwargs)
@classmethod
def get_s(cls, sid, request=None):
return cls()
@classmethod
def expire(cls, sid):
pass
@classmethod
def count(cls):
return 0
@classmethod
def all(cls):
return {}
@classmethod
def open(cls):
cls.gc()
@classmethod
def close(cls):
pass
@classmethod
def empty(cls):
pass
@classmethod
def gc(cls):
pass
def keys(self):
return ()
def iterkeys(self):
return self.keys()
def values(self):
return ()
def itervalues(self):
return self.values()
def items(self):
return ()
def iteritems(self):
return self.items()
def pop(self, key, default=None):
if not key in self:
return default
value = self[key]
del self[key]
return value
def start(self):
pass
def flush(self, request=None):
self.mark(dirty=False)
def mark(self, dirty=True, extend=False):
self.dirty = dirty
if extend:
self.extend()
def extend(self, duration=None):
duration = duration or self.duration
if not duration:
return
self.modify = time.time()
self.duration = duration
self.expire = self.modify + duration
self.mark()
return self.expire
def is_expired(self):
has_expire = hasattr(self, "expire")
if not has_expire:
return False
current = time.time()
return current >= self.expire
def is_dirty(self):
if not hasattr(self, "dirty"):
return True
return self.dirty
def is_loaded(self):
return True
def ensure(self, *args, **kwargs):
return self
def get(self, key, default=None):
try:
value = self.__getitem__(key)
except KeyError:
value = default
return value
def set(self, key, value):
self.__setitem__(key, value)
def delete(self, key, force=False):
if not force and not key in self:
return
self.__delitem__(key)
def get_t(self, key, default=None):
try:
value = self.data_t[key]
except KeyError:
value = default
return value
def set_t(self, key, value):
self.data_t[key] = value
def delete_t(self, key, force=False):
if not force and not key in self.data_t:
return
del self.data_t[key]
def timeout(self):
current = time.time()
return self.expire - current
def set_transient(self, value=True):
"""
Marks the current session as transient only meaning
that all of the operations will be made in memory
and not persisted through session engine.
This behaviour is ideal for secret key based session
that do not have long lived life-cycles.
:type value: bool
:param value: The new value to be set for transient.
"""
self.transient = value
def _gen_sid(self):
token_s = str(uuid.uuid4())
token_s = legacy.bytes(token_s)
token = hashlib.sha256(token_s).hexdigest()
return token
def _to_seconds(self, delta):
return (
delta.microseconds + (delta.seconds + delta.days * 24 * 3600) * 10**6
) / 10**6
class MockSession(Session):
"""
Temporary mock session to be used while no final
session is yet defined in the request, this is a
special case of a session and should not comply
with the pre-defined standard operations.
"""
def __init__(self, request, name="mock", *args, **kwargs):
Session.__init__(self, name=name, *args, **kwargs)
self.request = request
self.setter = None
def __setitem__(self, key, value):
if self.transient:
return Session.__setitem__(self, key, value)
session = self.ensure(sid=self.sid, address=self.address)
return session.__setitem__(key, value)
def __setstate__(self, state):
Session.__setstate__(self, state)
self.request = None
def is_loaded(self):
return False
def ensure(self, *args, **kwargs):
if self.transient:
return self
self._ensure_names(kwargs)
session_c = self.request.session_c
session = session_c.new(*args, **kwargs)
self.request.session = session
self.request.set_cookie = "sid=%s" % session.sid
return session
def _ensure_names(self, kwargs):
for name in ("sid", "address"):
if name in kwargs:
continue
kwargs[name] = getattr(self, name)
class DataSession(Session):
def __init__(self, *args, **kwargs):
Session.__init__(self, *args, **kwargs)
self.data = {}
def __len__(self):
return Session.__len__(self) + self.data.__len__()
def __getitem__(self, key):
try:
return self.data.__getitem__(key)
except KeyError:
return Session.__getitem__(self, key)
def __setitem__(self, key, value):
self.mark(extend=self.growing)
return self.data.__setitem__(key, value)
def __delitem__(self, key):
try:
self.mark(extend=self.growing)
return self.data.__delitem__(key)
except KeyError:
return Session.__delitem__(self, key)
def __iter__(self):
return self._merged.__iter__()
def __contains__(self, item):
return Session.__contains__(self, item) or self.data.__contains__(item)
def __getstate__(self):
state = Session.__getstate__(self)
state.update(data=self.data)
return state
def __setstate__(self, state):
Session.__setstate__(self, state)
for name in ("data",):
setattr(self, name, state[name])
def keys(self):
return self._merged.keys()
def values(self):
return self._merged.values()
def items(self):
return self._merged.items()
def sorted(self):
keys = self.keys()
keys = list(keys)
keys.sort()
return keys
@property
def _merged(self):
if not self.data_t:
return self.data
if not self.data:
return self.data_t
merged = dict()
merged.update(self.data_t)
merged.update(self.data)
return merged
class MemorySession(DataSession):
SESSIONS = {}
""" Global static sessions map where all the
(in-memory) session instances are going to be
stored to be latter retrieved """
def __init__(self, name="session", *args, **kwargs):
DataSession.__init__(self, name=name, *args, **kwargs)
self["sid"] = self.sid
@classmethod
def new(cls, *args, **kwargs):
session = cls(*args, **kwargs)
cls.SESSIONS[session.sid] = session.__getstate__()
return session
@classmethod
def get_s(cls, sid, request=None):
state = cls.SESSIONS.get(sid, None)
if not state:
return state
session = cls.__new__(cls)
session.__setstate__(state)
is_expired = session.is_expired()
if is_expired:
cls.expire(sid)
session = None if is_expired else session
return session
@classmethod
def expire(cls, sid):
del cls.SESSIONS[sid]
@classmethod
def count(cls):
return len(cls.SESSIONS)
@classmethod
def all(cls):
return cls.SESSIONS
@classmethod
def empty(cls):
cls.SESSIONS.empty()
class FileSession(DataSession):
"""
Shelve based file system session engine that store the
session information in a single file.
This session engine should be used carefully as race
conditions in the file access may corrupt its contents,
thus making it not suitable for multi-threaded or multi-
process environments.
"""
SHELVE = None
""" Global shelve object reference should reflect the
result of opening a file in shelve mode, this is a global
object and only one instance should exist per process """
def __init__(self, name="file", *args, **kwargs):
DataSession.__init__(self, name=name, *args, **kwargs)
self["sid"] = self.sid
@classmethod
def new(cls, *args, **kwargs):
if cls.SHELVE == None:
cls.open()
session = cls(*args, **kwargs)
cls.SHELVE[session.sid] = session
return session
@classmethod
def get_s(cls, sid, request=None):
if cls.SHELVE == None:
cls.open()
session = cls.SHELVE.get(sid, None)
if not session:
return session
is_expired = session.is_expired()
if is_expired:
cls.expire(sid)
session = None if is_expired else session
return session
@classmethod
def expire(cls, sid):
del cls.SHELVE[sid]
@classmethod
def count(cls):
return len(cls.SHELVE)
@classmethod
def all(cls):
return cls.SHELVE
@classmethod
def open(cls, file_path="session.shelve"):
base_path = config.conf("APPIER_BASE_PATH", "")
base_path = config.conf("SESSION_FILE_PATH", base_path)
if base_path and not os.path.exists(base_path):
os.makedirs(base_path)
base_path = os.path.expanduser(base_path)
base_path = os.path.abspath(base_path)
base_path = os.path.normpath(base_path)
file_path = os.path.join(base_path, file_path)
cls.SHELVE = shelve.open(file_path, protocol=2, writeback=True)
cls.gc()
@classmethod
def close(cls):
if not cls.SHELVE:
return
cls.SHELVE.close()
cls.SHELVE = None
@classmethod
def empty(cls):
for sid in cls.SHELVE:
del cls.SHELVE[sid]
@classmethod
def gc(cls):
for sid in cls.SHELVE:
session = cls.SHELVE.get(sid, None)
is_expired = session.is_expired()
if is_expired:
cls.expire(sid)
@classmethod
def db_type(cls):
shelve_cls = type(cls.SHELVE.dict)
shelve_dbm = shelve_cls.__name__
return shelve_dbm
@classmethod
def db_secure(cls):
return cls.db_type() == "dbm"
def flush(self, request=None, secure=None):
if not self.is_dirty():
return
self.mark(dirty=False)
self.sync(secure=secure)
def sync(self, secure=None):
cls = self.__class__
if secure == None:
secure = cls.db_secure()
if secure:
cls.SHELVE.close()
cls.open()
else:
cls.SHELVE.sync()
class RedisSession(DataSession):
REDIS = None
""" Global shelve object reference should reflect the
result of opening a file in shelve mode, this is a global
object and only one instance should exist per process """
SERIALIZER = pickle
""" The serializer to be used for the values contained in
the session (used on top of the class) """
def __init__(self, name="redis", *args, **kwargs):
DataSession.__init__(self, name=name, *args, **kwargs)
self["sid"] = self.sid
@classmethod
def new(cls, *args, **kwargs):
if cls.REDIS == None:
cls.open()
session = cls(*args, **kwargs)
data = cls.SERIALIZER.dumps(session)
timeout = session.timeout()
timeout = int(timeout)
cls.REDIS.setex(session.sid, value=data, time=timeout)
return session
@classmethod
def get_s(cls, sid, request=None):
if cls.REDIS == None:
cls.open()
data = cls.REDIS.get(sid)
if not data:
return data
session = cls.SERIALIZER.loads(data)
is_expired = session.is_expired()
if is_expired:
cls.expire(sid)
session = None if is_expired else session
return session
@classmethod
def expire(cls, sid):
cls.REDIS.delete(sid)
@classmethod
def count(cls):
if cls.REDIS == None:
cls.open()
return cls.REDIS.dbsize()
@classmethod
def all(cls):
if cls.REDIS == None:
cls.open()
sessions = dict()
sids = cls.REDIS.keys()
for sid in sids:
data = cls.REDIS.get(sid)
try:
session = cls.SERIALIZER.loads(data)
except Exception:
continue
sessions[sid] = session
return sessions
@classmethod
def open(cls):
cls.REDIS = redisdb.get_connection()
@classmethod
def empty(cls):
if cls.REDIS == None:
cls.open()
cls.REDIS.flushdb()
def flush(self, request=None):
if not self.is_dirty():
return
self.mark(dirty=False)
cls = self.__class__
data = cls.SERIALIZER.dumps(self)
timeout = self.timeout()
timeout = int(timeout)
cls.REDIS.setex(self.sid, value=data, time=timeout)
class ClientSession(DataSession):
"""
Client side based session, that used encryption to store the
complete set of information for the session on the client side
through the usage of cookies.
This session class provides extreme scalability as every server
instance is independent and does not require inter-communication.
"""
SERIALIZER = pickle
""" The serializer to be used for the values contained in
the session (used on top of the class) """
COOKIE_LIMIT = 4096
""" The limit (in bytes) of a cookie to be properly handled
by most of the modern web browsers """
def __init__(self, name="client", *args, **kwargs):
DataSession.__init__(self, name=name, *args, **kwargs)
self["sid"] = self.sid
@classmethod
def get_s(cls, sid, request=None):
data_b64 = request.cookies.get("session", None)
if not data_b64:
return None
data = base64.b64decode(data_b64)
data = zlib.decompress(data)
data = cls._verify(data, request)
session = cls.SERIALIZER.loads(data)
is_expired = session.is_expired()
if is_expired:
cls.expire(sid)
session = None if is_expired else session
return session
@classmethod
def _sign(cls, data, request):
secret = cls._secret(request)
secret = legacy.bytes(secret)
digest = hmac.new(secret, data).hexdigest()
digest = legacy.bytes(digest)
data = digest + b":" + data
return data
@classmethod
def _verify(cls, data, request):
secret = cls._secret(request)
secret = legacy.bytes(secret)
digest, data = data.split(b":", 1)
expected = hmac.new(secret, data).hexdigest()
expected = legacy.bytes(expected)
valid = digest == expected
if not valid:
raise exceptions.SecurityError(message="Invalid signature for message")
return data
@classmethod
def _secret(cls, request):
owner = request.owner
if not hasattr(owner, "secret"):
return None
return owner.secret
def flush(self, request=None):
cls = self.__class__
if not self.is_dirty():
return
self.mark(dirty=False)
cls = self.__class__
data = cls.SERIALIZER.dumps(self)
data = cls._sign(data, request)
data = zlib.compress(data)
data_b64 = base64.b64encode(data)
data_b64 = legacy.str(data_b64)
valid = len(data_b64) <= cls.COOKIE_LIMIT
if not valid:
raise exceptions.OperationalError(
message="Session payload size over cookie limit"
)
request.set_cookie = "session=%s" % data_b64
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