mirror of
https://github.com/Hopiu/django-imagekit.git
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45 lines
1.1 KiB
Python
45 lines
1.1 KiB
Python
from ...utils import get_singleton
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from django.core.exceptions import ImproperlyConfigured
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def get_default_image_cache_backend():
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"""
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Get the default image cache backend.
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"""
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from django.conf import settings
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return get_singleton(settings.IMAGEKIT_DEFAULT_IMAGE_CACHE_BACKEND,
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'image cache backend')
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class InvalidImageCacheBackendError(ImproperlyConfigured):
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pass
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class Simple(object):
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"""
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The most basic image cache backend. Files are considered valid if they
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exist. To invalidate a file, it's deleted; to validate one, it's generated
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immediately.
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"""
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def is_invalid(self, file):
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if not getattr(file, '_file', None):
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# No file on object. Have to check storage.
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return not file.storage.exists(file.name)
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return False
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def validate(self, file):
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"""
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Generates a new image by running the processors on the source file.
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"""
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if self.is_invalid(file):
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file.generate(save=True)
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def invalidate(self, file):
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file.delete(save=False)
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def clear(self, file):
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file.delete(save=False)
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