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# 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 Cross-Origin Resource Sharing WSGI middleware."""
class CORSMiddleware(object):
"""U1DB Cross-Origin Resource Sharing WSGI middleware."""
def __init__(self, app, accept_cors_connections):
self.origins = ' '.join(accept_cors_connections)
self.app = app
def _cors_headers(self):
return [('access-control-allow-origin', self.origins),
('access-control-allow-headers',
'authorization, content-type, x-requested-with'),
('access-control-allow-methods',
'GET, POST, PUT, DELETE, OPTIONS')]
def __call__(self, environ, start_response):
def wrap_start_response(status, headers, exc_info=None):
headers += self._cors_headers()
return start_response(status, headers, exc_info)
if environ['REQUEST_METHOD'].lower() == 'options':
wrap_start_response("200 OK", [('content-type', 'text/plain')])
return ['']
return self.app(environ, wrap_start_response)
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