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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 muck
class AuthorizationChecker:
def __init__(self, signing_key_text):
self._tc = muck.TokenChecker(signing_key_text.strip().encode('ascii'))
def request_is_allowed(self, r, required_scopes):
token = self._get_token(r)
if token is None:
return False
scope = token.get('scope', '')
scopes = set(scope.split())
required_scopes = set(required_scopes)
return scopes.intersection(required_scopes) == required_scopes
def _get_token(self, r):
authz = r.get_authorization()
try:
return self._tc.parse_header(authz)
except muck.Error:
return None
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