def __set_response_expires(self, op_name, expires, max_age=None):
"""Used to set expiration headers on a response dynamically
based on the name of the operation.
'op_name' is a string containing the name of the depot
operation as listed in the REPO_OPS_* constants.
'expires' is an integer value in seconds indicating how
long from when the request was made the content returned
should expire. The maximum value is 365*86400.
'max_age' is an integer value in seconds indicating the
maximum length of time a response should be considered
valid. For some operations, the maximum value for this
parameter is equal to the repository's refresh_seconds
property."""
prefix = self._get_req_pub()
if not prefix:
prefix = self.repo.cfg.get_property("publisher",
"prefix")
rs = None
if prefix:
try:
pub = self.repo.get_publisher(prefix)
except Exception as e:
# Couldn't get pub.
pass
else:
repo = pub.repository
if repo:
rs = repo.refresh_seconds
if rs is None:
rs = 14400
if max_age is None:
max_age = min((rs, expires))
now = cherrypy.response.time
if op_name == "publisher" or op_name == "search" or \
op_name == "catalog":
# For these operations, cap the value based on
# refresh_seconds.
expires = now + min((rs, max_age))
max_age = min((rs, max_age))
else:
expires = now + expires
headers = cherrypy.response.headers
headers["Cache-Control"] = \
"must-revalidate, no-transform, max-age={0:d}".format(
max_age)
headers["Expires"] = formatdate(timeval=expires, usegmt=True)
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