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# Copyright 2017 Canonical Ltd.
# Licensed under the LGPLv3, see LICENCE file for details.
import macaroonbakery.bakery as bakery
import requests
from ._error import BAKERY_PROTOCOL_HEADER
from six.moves.urllib.parse import urlparse
class ThirdPartyLocator(bakery.ThirdPartyLocator):
''' Implements macaroonbakery.ThirdPartyLocator by first looking in the
backing cache and, if that fails, making an HTTP request to find the
information associated with the given discharge location.
'''
def __init__(self, allow_insecure=False):
'''
@param url: the url to retrieve public_key
@param allow_insecure: By default it refuses to use insecure URLs.
'''
self._allow_insecure = allow_insecure
self._cache = {}
def third_party_info(self, loc):
u = urlparse(loc)
if u.scheme != 'https' and not self._allow_insecure:
raise bakery.ThirdPartyInfoNotFound(
'untrusted discharge URL {}'.format(loc))
loc = loc.rstrip('/')
info = self._cache.get(loc)
if info is not None:
return info
url_endpoint = '/discharge/info'
headers = {
BAKERY_PROTOCOL_HEADER: str(bakery.LATEST_VERSION)
}
resp = requests.get(url=loc + url_endpoint, headers=headers)
status_code = resp.status_code
if status_code == 404:
url_endpoint = '/publickey'
resp = requests.get(url=loc + url_endpoint, headers=headers)
status_code = resp.status_code
if status_code != 200:
raise bakery.ThirdPartyInfoNotFound(
'unable to get info from {}'.format(url_endpoint))
json_resp = resp.json()
if json_resp is None:
raise bakery.ThirdPartyInfoNotFound(
'no response from /discharge/info')
pk = json_resp.get('PublicKey')
if pk is None:
raise bakery.ThirdPartyInfoNotFound(
'no public key found in /discharge/info')
idm_pk = bakery.PublicKey.deserialize(pk)
version = json_resp.get('Version', bakery.VERSION_1)
self._cache[loc] = bakery.ThirdPartyInfo(
version=version,
public_key=idm_pk
)
return self._cache.get(loc)
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