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# Copyright 2017 Canonical Ltd.
# Licensed under the LGPLv3, see LICENCE file for details.
import base64
import json
import nacl.public
import nacl.encoding
import requests.cookies
import six
from six.moves.urllib.parse import urlparse
class AgentFileFormatError(Exception):
""" AgentFileFormatError is the exception raised when an agent file has a bad
structure.
"""
pass
def load_agent_file(filename, cookies=None):
""" Loads agent information from the specified file.
The agent cookies are added to cookies, or a newly created cookie jar
if cookies is not specified. The updated cookies is returned along
with the private key associated with the agent. These can be passed
directly as the cookies and key parameter to BakeryAuth.
"""
with open(filename) as f:
data = json.load(f)
try:
key = nacl.public.PrivateKey(data['key']['private'],
nacl.encoding.Base64Encoder)
if cookies is None:
cookies = requests.cookies.RequestsCookieJar()
for agent in data['agents']:
u = urlparse(agent['url'])
value = {'username': agent['username'],
'public_key': data['key']['public']}
jv = json.dumps(value)
if six.PY3:
jv = jv.encode('utf-8')
v = base64.b64encode(jv)
if six.PY3:
v = v.decode('utf-8')
cookie = requests.cookies.create_cookie('agent-login', v,
domain=u.netloc,
path=u.path)
cookies.set_cookie(cookie)
return cookies, key
except (KeyError, ValueError) as e:
raise AgentFileFormatError("invalid agent file", e)
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