27 lines
986 B
Python
27 lines
986 B
Python
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from django.conf import settings
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from django.contrib.messages.storage import default_storage
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from django.utils.deprecation import MiddlewareMixin
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class MessageMiddleware(MiddlewareMixin):
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"""
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Middleware that handles temporary messages.
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"""
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def process_request(self, request):
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request._messages = default_storage(request)
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def process_response(self, request, response):
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"""
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Update the storage backend (i.e., save the messages).
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Raise ValueError if not all messages could be stored and DEBUG is True.
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"""
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# A higher middleware layer may return a request which does not contain
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# messages storage, so make no assumption that it will be there.
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if hasattr(request, '_messages'):
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unstored_messages = request._messages.update(response)
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if unstored_messages and settings.DEBUG:
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raise ValueError('Not all temporary messages could be stored.')
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return response
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