def url(self, name):
"""
Returns the URL where the contents of the file referenced by name can
be accessed.
"""
try:
m = hashlib.sha1()
m.update(self.container)
m.update(name)
cache_key = m.hexdigest()
val = cache.get(cache_key)
if val is None:
logger.info("trying to generate shared access url for %s" %
name)
accss_plcy = AccessPolicy()
now = datetime.datetime.now()
today = now.strftime('%Y-%m-%d')
tomorrow_datetime = now + datetime.timedelta(days=1)
tomorrow = tomorrow_datetime.strftime('%Y-%m-%d')
accss_plcy.start = today
accss_plcy.expiry = tomorrow
accss_plcy.permission = 'r'
signed_identifier = None
sap = SharedAccessPolicy(accss_plcy, signed_identifier)
logger.info("shared access policy created")
signer = SharedAccessSignature(account_name=self.account_name,
account_key=self.account_key)
logger.info("signed created")
qry_str = signer.generate_signed_query_string(
"%s/%s" % (self.container, name), 'b', sap)
logger.info("signed query string created")
val = '%s/%s?%s' % (self._get_container_url(), name,
signer._convert_query_string(qry_str))
# cache for 23 hours
timeout = 60 * 60 * 23
cache.set(cache_key, val, timeout)
return val
else:
logger.info("url cache hit for %s" % name)
return val
except Exception as ex:
logger.error("shared access error %s" % ex)
return None
