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# Copyright (C) 2018 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import urllib.parse
import bottle
import qvisqve
import qvisqve_secrets
class TokenRouter(qvisqve.Router):
def __init__(self, token_generator, clients, users, authz_attempts):
qvisqve.log.log('debug', msg_text='TokenRouter init starts')
super().__init__()
args = (users, clients, token_generator, authz_attempts)
self._grants = {
'client_credentials': ClientCredentialsGrant(*args),
'authorization_code': AuthorizationCodeGrant(*args),
}
qvisqve.log.log('debug', msg_text='TokenRouter created')
def get_routes(self):
return [
{
'method': 'POST',
'path': '/token',
'callback': self._create_token,
'needs-authorization': False,
},
]
def _create_token(self, content_type, body, **kwargs):
qvisqve.log.log('xxx', body=body, kwargs=kwargs)
if content_type != 'application/x-www-form-urlencoded':
return qvisqve.bad_request_response('Wrong content type')
params = self._get_form_params(body)
grant_type = self._get_grant_type(params)
grant = self._get_grant(grant_type)
if grant is None:
return qvisqve.bad_request_response('Wrong grant type')
return grant.get_token(bottle.request, params)
def _get_form_params(self, body):
body = body.decode('UTF-8')
return urllib.parse.parse_qs(body)
def _get_grant_type(self, params):
grant_type = params.get('grant_type')
if len(grant_type) == 1:
return grant_type[0]
return None
def _get_grant(self, grant_type):
return self._grants.get(grant_type)
class Grant:
def __init__(self, users, clients, generator, authz_attempts):
self._users = users
self._clients = clients
self._generator = generator
self._attempts = authz_attempts
class ClientCredentialsGrant(Grant):
def get_token(self, request, params):
qvisqve.log.log(
'debug', msg_text='ClientCredentialGrant.get_token called',
request=request, params=params)
client_id, client_secret = request.auth
if not self._clients.is_valid_secret(client_id, client_secret):
qvisqve.log.log(
'error', msg_text='Client token request is unauthorized')
return qvisqve.unauthorized_response('Unauthorized')
scope = self._get_scope(params)
if scope is None:
return qvisqve.bad_request_response('Bad scope')
allowed = self._clients.get_allowed_scopes(client_id)
scope = ' '.join(
s
for s in scope.split()
if s in allowed
)
token = self._generator.new_token(client_id, scope)
return qvisqve.ok_response({
'access_token': token,
'token_type': 'Bearer',
'scope': scope,
})
def _get_scope(self, params):
scope = params.get('scope', [])
if len(scope) > 1:
return None
if scope:
return scope[0]
return ''
class AuthorizationCodeGrant(Grant):
def get_token(self, request, params):
client_id, client_secret = request.auth
if not self._clients.is_valid_secret(client_id, client_secret):
qvisqve.log.log('error', msg_text='Invalid client creds given')
return qvisqve.unauthorized_response('Access denied')
code = self._get_code(params)
if code is None:
qvisqve.log.log('error', msg_text='No code given')
return qvisqve.unauthorized_response('Access denied')
aa = self._attempts.find_by_code(code)
if aa is None:
qvisqve.log.log('error', msg_text='Unknown code given', code=code)
return qvisqve.bad_request_response('Bad request')
subject_id = aa.get_subject_id()
scope = aa.get_scope()
allowed = self._users.get_allowed_scopes(subject_id)
scope = ' '.join(
s
for s in scope.split()
if s in allowed
)
self._attempts.delete_by_id(aa.get_attempt_id())
empty_token = self._generator.new_token(
'', scope, subject_id=subject_id)
return qvisqve.ok_response({
'access_token': empty_token,
'token_type': 'Bearer',
'expires_in': 3600, # FIXME expiration time
'scope': '',
})
def _get_code(self, params):
code = params.get('code')
if len(code) == 1:
return code[0]
return None
class Clients:
def __init__(self, clients):
self._clients = clients
self._hasher = qvisqve_secrets.SecretHasher()
def is_correct_secret(self, client_id, cleartext):
client = self._get_client(client_id)
secret = client.get('client_secret')
return secret and self._hasher.is_correct(secret, cleartext)
def get_allowed_scopes(self, client_id):
client = self._get_client(client_id)
return client.get('allowed_scopes', [])
def _get_client(self, client_id):
return self._clients.get(client_id, {})
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