53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
import json
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from django.contrib.messages.storage.base import BaseStorage
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from django.contrib.messages.storage.cookie import MessageDecoder, MessageEncoder
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from django.core.exceptions import ImproperlyConfigured
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class SessionStorage(BaseStorage):
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"""
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Store messages in the session (that is, django.contrib.sessions).
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"""
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session_key = "_messages"
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def __init__(self, request, *args, **kwargs):
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if not hasattr(request, "session"):
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raise ImproperlyConfigured(
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"The session-based temporary message storage requires session "
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"middleware to be installed, and come before the message "
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"middleware in the MIDDLEWARE list."
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)
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super().__init__(request, *args, **kwargs)
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def _get(self, *args, **kwargs):
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"""
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Retrieve a list of messages from the request's session. This storage
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always stores everything it is given, so return True for the
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all_retrieved flag.
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"""
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return (
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self.deserialize_messages(self.request.session.get(self.session_key)),
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True,
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)
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def _store(self, messages, response, *args, **kwargs):
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"""
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Store a list of messages to the request's session.
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"""
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if messages:
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self.request.session[self.session_key] = self.serialize_messages(messages)
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else:
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self.request.session.pop(self.session_key, None)
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return []
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def serialize_messages(self, messages):
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encoder = MessageEncoder()
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return encoder.encode(messages)
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def deserialize_messages(self, data):
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if data and isinstance(data, str):
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return json.loads(data, cls=MessageDecoder)
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return data
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