mirror of
https://github.com/PiBrewing/craftbeerpi4.git
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63 lines
2.2 KiB
Python
63 lines
2.2 KiB
Python
import binascii
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import json
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import nacl.secret
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import nacl.utils
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import nacl.exceptions
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from nacl.encoding import Base64Encoder
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from . import AbstractStorage, Session
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from .log import log
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class NaClCookieStorage(AbstractStorage):
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"""NaCl Encrypted JSON storage.
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"""
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def __init__(self, secret_key, *, 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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self._secretbox = nacl.secret.SecretBox(secret_key)
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def empty_session(self):
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return Session(None, data=None, new=True, max_age=self.max_age)
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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 self.empty_session()
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else:
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try:
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data = self._decoder(
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self._secretbox.decrypt(
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cookie.encode('utf-8'),
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encoder=Base64Encoder).decode('utf-8')
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)
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return Session(None, data=data, new=False,
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max_age=self.max_age)
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except (binascii.Error, nacl.exceptions.CryptoError):
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log.warning("Cannot decrypt cookie value, "
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"create a new fresh session")
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return self.empty_session()
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async def save_session(self, request, response, session):
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if session.empty:
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return self.save_cookie(response, session._mapping,
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max_age=session.max_age)
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cookie_data = self._encoder(
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self._get_session_data(session)
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).encode('utf-8')
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nonce = nacl.utils.random(nacl.secret.SecretBox.NONCE_SIZE)
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self.save_cookie(
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response,
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self._secretbox.encrypt(cookie_data, nonce,
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encoder=Base64Encoder).decode('utf-8'),
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max_age=session.max_age
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)
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