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- import json
-
- from django.conf import settings
- from django.contrib.messages.storage.base import BaseStorage
- from django.contrib.messages.storage.cookie import (
- MessageDecoder, MessageEncoder,
- )
-
-
- class SessionStorage(BaseStorage):
- """
- Store messages in the session (that is, django.contrib.sessions).
- """
- session_key = '_messages'
-
- def __init__(self, request, *args, **kwargs):
- assert hasattr(request, 'session'), "The session-based temporary "\
- "message storage requires session middleware to be installed, "\
- "and come before the message middleware in the "\
- "MIDDLEWARE%s list." % ("_CLASSES" if settings.MIDDLEWARE is None else "")
- super().__init__(request, *args, **kwargs)
-
- def _get(self, *args, **kwargs):
- """
- Retrieve a list of messages from the request's session. This storage
- always stores everything it is given, so return True for the
- all_retrieved flag.
- """
- return self.deserialize_messages(self.request.session.get(self.session_key)), True
-
- def _store(self, messages, response, *args, **kwargs):
- """
- Store a list of messages to the request's session.
- """
- if messages:
- self.request.session[self.session_key] = self.serialize_messages(messages)
- else:
- self.request.session.pop(self.session_key, None)
- return []
-
- def serialize_messages(self, messages):
- encoder = MessageEncoder(separators=(',', ':'))
- return encoder.encode(messages)
-
- def deserialize_messages(self, data):
- if data and isinstance(data, str):
- return json.loads(data, cls=MessageDecoder)
- return data
|
