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from functools import wraps
from flask import request, Response, make_response
from web.lib.utils import to_hash
def etag_match(func):
@wraps(func)
def wrapper(*args, **kwargs):
response = func(*args, **kwargs)
if isinstance(response, Response):
etag = to_hash(response.data)
headers = response.headers
elif type(response) is str:
etag = to_hash(response)
headers = {}
else:
return response
if request.headers.get('if-none-match') == etag:
response = Response(status=304)
response.headers['Cache-Control'] \
= headers.get('Cache-Control', 'pragma: no-cache')
elif not isinstance(response, Response):
response = make_response(response)
response.headers['etag'] = etag
return response
return wrapper
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