def testQuoting(self):
quoted_etag = quote_etag(r'e\t"ag')
self.assertEqual(quoted_etag, r'"e\\t\"ag"')
def inner(request, *args, **kwargs):
# Get HTTP request headers
if_modified_since = request.META.get("HTTP_IF_MODIFIED_SINCE")
if if_modified_since:
if_modified_since = parse_http_date_safe(if_modified_since)
if_none_match = request.META.get("HTTP_IF_NONE_MATCH")
if_match = request.META.get("HTTP_IF_MATCH")
if if_none_match or if_match:
# There can be more than one ETag in the request, so we
# consider the list of values.
try:
etags = parse_etags(if_none_match or if_match)
except ValueError:
# In case of invalid etag ignore all ETag headers.
# Apparently Opera sends invalidly quoted headers at times
# (we should be returning a 400 response, but that's a
# little extreme) -- this is Django bug #10681.
if_none_match = None
if_match = None
# Compute values (if any) for the requested resource.
if etag_func:
res_etag = etag_func(request, *args, **kwargs)
else:
res_etag = None
if last_modified_func:
dt = last_modified_func(request, *args, **kwargs)
if dt:
res_last_modified = timegm(dt.utctimetuple())
else:
res_last_modified = None
else:
res_last_modified = None
response = None
if not ((if_match and (if_modified_since or if_none_match)) or
(if_match and if_none_match)):
# We only get here if no undefined combinations of headers are
# specified.
if ((if_none_match and (res_etag in etags or
"*" in etags and res_etag)) and
(not if_modified_since or
(res_last_modified and if_modified_since and
res_last_modified <= if_modified_since))):
if request.method in ("GET", "HEAD"):
response = HttpResponseNotModified()
else:
logger.warning('Precondition Failed: %s', request.path,
extra={
'status_code': 412,
'request': request
}
)
response = HttpResponse(status=412)
elif if_match and ((not res_etag and "*" in etags) or
(res_etag and res_etag not in etags)):
logger.warning('Precondition Failed: %s', request.path,
extra={
'status_code': 412,
'request': request
}
)
response = HttpResponse(status=412)
elif (not if_none_match and request.method == "GET" and
res_last_modified and if_modified_since and
res_last_modified <= if_modified_since):
response = HttpResponseNotModified()
if response is None:
response = func(request, *args, **kwargs)
# Set relevant headers on the response if they don't already exist.
if res_last_modified and not response.has_header('Last-Modified'):
response['Last-Modified'] = http_date(res_last_modified)
if res_etag and not response.has_header('ETag'):
response['ETag'] = quote_etag(res_etag)
return response