68 lines
2.6 KiB
Python
68 lines
2.6 KiB
Python
import hashlib
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import os
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from django.conf import STATICFILES_STORAGE_ALIAS, settings
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from django.contrib.staticfiles.storage import HashedFilesMixin
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from django.core.files.storage import storages
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from django.templatetags.static import static
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from wagtail import __version__
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# Check whether we should add cache-busting '?v=...' parameters to static file URLs
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try:
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# If a preference has been explicitly stated in the WAGTAILADMIN_STATIC_FILE_VERSION_STRINGS
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# setting, use that
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use_version_strings = settings.WAGTAILADMIN_STATIC_FILE_VERSION_STRINGS
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except AttributeError:
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# If WAGTAILADMIN_STATIC_FILE_VERSION_STRINGS not specified, default to version strings
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# enabled, UNLESS we're using a storage backend with hashed filenames; in this case having
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# a query parameter is redundant, and in some configurations (e.g. Cloudflare with the
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# "No Query String" setting) it could break a previously-working cache setup
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if settings.DEBUG:
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# Hashed filenames are disabled in debug mode, so keep the querystring
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use_version_strings = True
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else:
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# see if we're using a storage backend using hashed filenames
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storage = storages[STATICFILES_STORAGE_ALIAS].__class__
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use_version_strings = not issubclass(storage, HashedFilesMixin)
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if use_version_strings:
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# SECRET_KEY is used to prevent exposing the Wagtail version
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VERSION_HASH = hashlib.sha1(
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(__version__ + settings.SECRET_KEY).encode("utf-8")
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).hexdigest()[:8]
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else:
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VERSION_HASH = None
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if os.environ.get("WAGTAIL_FAIL_ON_VERSIONED_STATIC", "0") == "1":
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def versioned_static(path):
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raise Exception(
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"`versioned_static` was called during application startup. This is not valid "
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"as it will cause failures if collectstatic has not yet completed (e.g. during "
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"the collectstatic command itself). Ensure that any media definitions declared "
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"via `class Media` are converted to a `media` property."
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)
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else:
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def versioned_static(path):
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"""
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Wrapper for Django's static file finder to append a cache-busting query parameter
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that updates on each Wagtail version
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"""
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# An absolute path is returned unchanged (either a full URL, or processed already)
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if path.startswith(("http://", "https://", "/")):
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return path
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base_url = static(path)
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# if URL already contains a querystring, don't add our own, to avoid interfering
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# with existing mechanisms
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if VERSION_HASH is None or "?" in base_url:
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return base_url
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else:
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return base_url + "?v=" + VERSION_HASH
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