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from hashlib import md5
TEMPLATE_FRAGMENT_KEY_TEMPLATE = "template.cache.%s.%s"
def make_template_fragment_key(fragment_name, vary_on=None):
hasher = md5(usedforsecurity=False)
if vary_on is not None:
for arg in vary_on:
data = str(arg).encode()
# Use the netstring delimiter (with trailing comma).
hasher.update(b"%d:%s," % (len(data), data))
return TEMPLATE_FRAGMENT_KEY_TEMPLATE % (fragment_name, hasher.hexdigest())
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