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154 lines
4.3 KiB
Python
154 lines
4.3 KiB
Python
# Copyright (C) 2011 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Utilities for reading OAuth 2.0 client secret files.
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A client_secrets.json file contains all the information needed to interact with
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an OAuth 2.0 protected service.
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"""
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__author__ = 'jcgregorio@google.com (Joe Gregorio)'
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from anyjson import simplejson
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# Properties that make a client_secrets.json file valid.
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TYPE_WEB = 'web'
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TYPE_INSTALLED = 'installed'
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VALID_CLIENT = {
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TYPE_WEB: {
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'required': [
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'client_id',
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'client_secret',
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'redirect_uris',
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'auth_uri',
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'token_uri',
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],
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'string': [
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'client_id',
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'client_secret',
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],
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},
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TYPE_INSTALLED: {
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'required': [
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'client_id',
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'client_secret',
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'redirect_uris',
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'auth_uri',
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'token_uri',
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],
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'string': [
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'client_id',
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'client_secret',
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],
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},
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}
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class Error(Exception):
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"""Base error for this module."""
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pass
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class InvalidClientSecretsError(Error):
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"""Format of ClientSecrets file is invalid."""
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pass
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def _validate_clientsecrets(obj):
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if obj is None or len(obj) != 1:
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raise InvalidClientSecretsError('Invalid file format.')
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client_type = obj.keys()[0]
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if client_type not in VALID_CLIENT.keys():
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raise InvalidClientSecretsError('Unknown client type: %s.' % client_type)
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client_info = obj[client_type]
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for prop_name in VALID_CLIENT[client_type]['required']:
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if prop_name not in client_info:
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raise InvalidClientSecretsError(
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'Missing property "%s" in a client type of "%s".' % (prop_name,
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client_type))
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for prop_name in VALID_CLIENT[client_type]['string']:
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if client_info[prop_name].startswith('[['):
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raise InvalidClientSecretsError(
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'Property "%s" is not configured.' % prop_name)
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return client_type, client_info
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def load(fp):
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obj = simplejson.load(fp)
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return _validate_clientsecrets(obj)
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def loads(s):
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obj = simplejson.loads(s)
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return _validate_clientsecrets(obj)
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def _loadfile(filename):
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try:
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fp = file(filename, 'r')
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try:
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obj = simplejson.load(fp)
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finally:
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fp.close()
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except IOError:
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raise InvalidClientSecretsError('File not found: "%s"' % filename)
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return _validate_clientsecrets(obj)
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def loadfile(filename, cache=None):
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"""Loading of client_secrets JSON file, optionally backed by a cache.
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Typical cache storage would be App Engine memcache service,
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but you can pass in any other cache client that implements
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these methods:
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- get(key, namespace=ns)
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- set(key, value, namespace=ns)
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Usage:
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# without caching
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client_type, client_info = loadfile('secrets.json')
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# using App Engine memcache service
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from google.appengine.api import memcache
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client_type, client_info = loadfile('secrets.json', cache=memcache)
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Args:
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filename: string, Path to a client_secrets.json file on a filesystem.
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cache: An optional cache service client that implements get() and set()
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methods. If not specified, the file is always being loaded from
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a filesystem.
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Raises:
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InvalidClientSecretsError: In case of a validation error or some
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I/O failure. Can happen only on cache miss.
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Returns:
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(client_type, client_info) tuple, as _loadfile() normally would.
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JSON contents is validated only during first load. Cache hits are not
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validated.
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"""
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_SECRET_NAMESPACE = 'oauth2client:secrets#ns'
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if not cache:
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return _loadfile(filename)
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obj = cache.get(filename, namespace=_SECRET_NAMESPACE)
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if obj is None:
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client_type, client_info = _loadfile(filename)
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obj = {client_type: client_info}
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cache.set(filename, obj, namespace=_SECRET_NAMESPACE)
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return obj.iteritems().next()
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