# Copyright 2014 # The Cloudscaling Group, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from oslo_config import cfg from oslo_context import context as common_context from oslo_log import log as logging import webob.dec import webob.exc import ec2api.api from ec2api import utils CONF = cfg.CONF LOG = logging.getLogger(__name__) def ec2_error_response(request_id, code, message, status=500): """Helper to construct an EC2 compatible error response.""" LOG.debug('EC2 error response: %(code)s: %(message)s', {'code': code, 'message': message}) resp = webob.Response() resp.status = status resp.headers['Content-Type'] = 'text/xml' resp.body = ( '<?xml version="1.0"?>\n' '<Response><Errors><Error><Code>%s</Code>' '<Message>%s</Message></Error></Errors>' '<RequestID>%s</RequestID></Response>' % (utils.xhtml_escape(code), utils.xhtml_escape(message), utils.xhtml_escape(request_id))).encode() return resp class Fault(webob.exc.HTTPException): """Captures exception and return REST Response.""" def __init__(self, exception): """Create a response for the given webob.exc.exception.""" self.wrapped_exc = exception @webob.dec.wsgify def __call__(self, req): """Generate a WSGI response based on the exception passed to ctor.""" code = ec2api.api.exception_to_ec2code(self.wrapped_exc) status = self.wrapped_exc.status_int message = self.wrapped_exc.explanation if status == 501: message = "The requested function is not supported" if 'AWSAccessKeyId' not in req.params: raise webob.exc.HTTPBadRequest() user_id, _sep, project_id = req.params['AWSAccessKeyId'].partition(':') project_id = project_id or user_id remote_address = getattr(req, 'remote_address', '127.0.0.1') if CONF.use_forwarded_for: remote_address = req.headers.get('X-Forwarded-For', remote_address) resp = ec2_error_response(common_context.generate_request_id(), code, message=message, status=status) return resp