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authordrebs <drebs@leap.se>2012-11-29 10:56:49 -0200
committerdrebs <drebs@leap.se>2012-11-29 10:56:49 -0200
commite23d579d8bc849408745c196a2794e145743f7d1 (patch)
tree360a55446373fbe2f4c86c746a7f4f92582efd14 /u1db/remote/oauth_middleware.py
parenta1ca18c131d37235f0bc125c55ca0dfb271f16a7 (diff)
add u1db code (not as submodule)
Diffstat (limited to 'u1db/remote/oauth_middleware.py')
-rw-r--r--u1db/remote/oauth_middleware.py89
1 files changed, 89 insertions, 0 deletions
diff --git a/u1db/remote/oauth_middleware.py b/u1db/remote/oauth_middleware.py
new file mode 100644
index 00000000..5772580a
--- /dev/null
+++ b/u1db/remote/oauth_middleware.py
@@ -0,0 +1,89 @@
+# Copyright 2012 Canonical Ltd.
+#
+# This file is part of u1db.
+#
+# u1db is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3
+# as published by the Free Software Foundation.
+#
+# u1db 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with u1db. If not, see <http://www.gnu.org/licenses/>.
+"""U1DB OAuth authorisation WSGI middleware."""
+import httplib
+from oauth import oauth
+try:
+ import simplejson as json
+except ImportError:
+ import json # noqa
+from urllib import quote
+from wsgiref.util import shift_path_info
+
+
+sign_meth_HMAC_SHA1 = oauth.OAuthSignatureMethod_HMAC_SHA1()
+sign_meth_PLAINTEXT = oauth.OAuthSignatureMethod_PLAINTEXT()
+
+
+class OAuthMiddleware(object):
+ """U1DB OAuth Authorisation WSGI middleware."""
+
+ # max seconds the request timestamp is allowed to be shifted
+ # from arrival time
+ timestamp_threshold = 300
+
+ def __init__(self, app, base_url, prefix='/~/'):
+ self.app = app
+ self.base_url = base_url
+ self.prefix = prefix
+
+ def get_oauth_data_store(self):
+ """Provide a oauth.OAuthDataStore."""
+ raise NotImplementedError(self.get_oauth_data_store)
+
+ def _error(self, start_response, status, description, message=None):
+ start_response("%d %s" % (status, httplib.responses[status]),
+ [('content-type', 'application/json')])
+ err = {"error": description}
+ if message:
+ err['message'] = message
+ return [json.dumps(err)]
+
+ def __call__(self, environ, start_response):
+ if self.prefix and not environ['PATH_INFO'].startswith(self.prefix):
+ return self._error(start_response, 400, "bad request")
+ headers = {}
+ if 'HTTP_AUTHORIZATION' in environ:
+ headers['Authorization'] = environ['HTTP_AUTHORIZATION']
+ oauth_req = oauth.OAuthRequest.from_request(
+ http_method=environ['REQUEST_METHOD'],
+ http_url=self.base_url + environ['PATH_INFO'],
+ headers=headers,
+ query_string=environ['QUERY_STRING']
+ )
+ if oauth_req is None:
+ return self._error(start_response, 401, "unauthorized",
+ "Missing OAuth.")
+ try:
+ self.verify(environ, oauth_req)
+ except oauth.OAuthError, e:
+ return self._error(start_response, 401, "unauthorized",
+ e.message)
+ shift_path_info(environ)
+ return self.app(environ, start_response)
+
+ def verify(self, environ, oauth_req):
+ """Verify OAuth request, put user_id in the environ."""
+ oauth_server = oauth.OAuthServer(self.get_oauth_data_store())
+ oauth_server.timestamp_threshold = self.timestamp_threshold
+ oauth_server.add_signature_method(sign_meth_HMAC_SHA1)
+ oauth_server.add_signature_method(sign_meth_PLAINTEXT)
+ consumer, token, parameters = oauth_server.verify_request(oauth_req)
+ # filter out oauth bits
+ environ['QUERY_STRING'] = '&'.join("%s=%s" % (quote(k, safe=''),
+ quote(v, safe=''))
+ for k, v in parameters.iteritems())
+ return consumer, token