mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-12-29 08:51:44 +01:00
278 lines
8.1 KiB
Python
278 lines
8.1 KiB
Python
"""User sessions for aiohttp.web."""
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import abc
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import json
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import time
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from collections.abc import MutableMapping
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from aiohttp import web
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__version__ = '2.9.0'
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class Session(MutableMapping):
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"""Session dict-like object."""
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def __init__(self, identity, *, data, new, max_age=None):
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self._changed = False
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self._mapping = {}
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self._identity = identity if data != {} else None
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self._new = new
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self._new = new if data != {} else True
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self._max_age = max_age
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created = data.get('created', None) if data else None
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session_data = data.get('session', None) if data else None
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now = int(time.time())
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age = now - created if created else now
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if max_age is not None and age > max_age:
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session_data = None
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if self._new or created is None:
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self._created = now
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else:
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self._created = created
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if session_data is not None:
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self._mapping.update(session_data)
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def __repr__(self):
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return '<{} [new:{}, changed:{}, created:{}] {!r}>'.format(
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self.__class__.__name__, self.new, self._changed,
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self.created, self._mapping)
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@property
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def new(self):
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return self._new
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@property
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def identity(self):
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return self._identity
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@property
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def created(self):
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return self._created
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@property
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def empty(self):
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return not bool(self._mapping)
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@property
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def max_age(self):
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return self._max_age
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@max_age.setter
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def max_age(self, value):
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self._max_age = value
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def changed(self):
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self._changed = True
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def invalidate(self):
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self._changed = True
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self._mapping = {}
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def set_new_identity(self, identity):
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if not self._new:
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raise RuntimeError(
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"Can't change identity for a session which is not new")
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self._identity = identity
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def __len__(self):
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return len(self._mapping)
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def __iter__(self):
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return iter(self._mapping)
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def __contains__(self, key):
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return key in self._mapping
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def __getitem__(self, key):
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return self._mapping[key]
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def __setitem__(self, key, value):
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self._mapping[key] = value
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self._changed = True
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def __delitem__(self, key):
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del self._mapping[key]
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self._changed = True
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SESSION_KEY = 'aiohttp_session'
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STORAGE_KEY = 'aiohttp_session_storage'
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async def get_session(request):
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session = request.get(SESSION_KEY)
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if session is None:
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storage = request.get(STORAGE_KEY)
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if storage is None:
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raise RuntimeError(
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"Install aiohttp_session middleware "
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"in your aiohttp.web.Application")
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else:
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session = await storage.load_session(request)
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if not isinstance(session, Session):
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raise RuntimeError(
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"Installed {!r} storage should return session instance "
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"on .load_session() call, got {!r}.".format(storage,
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session))
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request[SESSION_KEY] = session
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return session
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async def new_session(request):
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storage = request.get(STORAGE_KEY)
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if storage is None:
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raise RuntimeError(
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"Install aiohttp_session middleware "
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"in your aiohttp.web.Application")
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else:
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session = await storage.new_session()
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if not isinstance(session, Session):
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raise RuntimeError(
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"Installed {!r} storage should return session instance "
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"on .load_session() call, got {!r}.".format(storage, session))
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request[SESSION_KEY] = session
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return session
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def session_middleware(storage):
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if not isinstance(storage, AbstractStorage):
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raise RuntimeError("Expected AbstractStorage got {}".format(storage))
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@web.middleware
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async def factory(request, handler):
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request[STORAGE_KEY] = storage
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raise_response = False
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try:
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response = await handler(request)
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except web.HTTPException as exc:
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response = exc
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raise_response = True
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if not isinstance(response, web.StreamResponse):
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raise RuntimeError(
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"Expect response, not {!r}".format(type(response)))
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if not isinstance(response, web.Response):
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# likely got websocket or streaming
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return response
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if response.prepared:
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raise RuntimeError(
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"Cannot save session data into prepared response")
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session = request.get(SESSION_KEY)
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if session is not None:
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if session._changed:
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await storage.save_session(request, response, session)
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if raise_response:
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raise response
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return response
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return factory
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def setup(app, storage):
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"""Setup the library in aiohttp fashion."""
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app.middlewares.append(session_middleware(storage))
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class AbstractStorage(metaclass=abc.ABCMeta):
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def __init__(self, *, cookie_name="AIOHTTP_SESSION",
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domain=None, max_age=None, path='/',
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secure=None, httponly=True,
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encoder=json.dumps, decoder=json.loads):
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self._cookie_name = cookie_name
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self._cookie_params = dict(domain=domain,
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max_age=max_age,
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path=path,
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secure=secure,
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httponly=httponly)
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self._max_age = max_age
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self._encoder = encoder
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self._decoder = decoder
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@property
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def cookie_name(self):
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return self._cookie_name
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@property
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def max_age(self):
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return self._max_age
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@property
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def cookie_params(self):
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return self._cookie_params
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def _get_session_data(self, session):
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if not session.empty:
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data = {
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'created': session.created,
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'session': session._mapping
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}
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else:
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data = {}
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return data
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async def new_session(self):
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return Session(None, data=None, new=True, max_age=self.max_age)
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@abc.abstractmethod
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async def load_session(self, request):
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pass
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@abc.abstractmethod
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async def save_session(self, request, response, session):
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pass
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def load_cookie(self, request):
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cookie = request.cookies.get(self._cookie_name)
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return cookie
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def save_cookie(self, response, cookie_data, *, max_age=None):
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params = dict(self._cookie_params)
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if max_age is not None:
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params['max_age'] = max_age
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params['expires'] = time.strftime(
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"%a, %d-%b-%Y %T GMT",
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time.gmtime(time.time() + max_age))
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if not cookie_data:
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response.del_cookie(
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self._cookie_name,
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domain=params["domain"],
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path=params["path"],
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)
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else:
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response.set_cookie(self._cookie_name, cookie_data, **params)
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class SimpleCookieStorage(AbstractStorage):
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"""Simple JSON storage.
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Doesn't any encryption/validation, use it for tests only"""
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def __init__(self, *, cookie_name="AIOHTTP_SESSION",
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domain=None, max_age=None, path='/',
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secure=None, httponly=True,
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encoder=json.dumps, decoder=json.loads):
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super().__init__(cookie_name=cookie_name, domain=domain,
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max_age=max_age, path=path, secure=secure,
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httponly=httponly,
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encoder=encoder, decoder=decoder)
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async def load_session(self, request):
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cookie = self.load_cookie(request)
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if cookie is None:
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return Session(None, data=None, new=True, max_age=self.max_age)
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else:
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data = self._decoder(cookie)
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return Session(None, data=data, new=False, max_age=self.max_age)
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async def save_session(self, request, response, session):
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cookie_data = self._encoder(self._get_session_data(session))
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self.save_cookie(response, cookie_data, max_age=session.max_age)
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