95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
# Copyright 2014
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# The Cloudscaling Group, 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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# 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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from xml.sax import saxutils
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from oslo_config import cfg
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from oslo_log import log as logging
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import webob.dec
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import webob.exc
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import ec2api.api
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from ec2api import context
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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def xhtml_escape(value):
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"""Escapes a string so it is valid within XML or XHTML.
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"""
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return saxutils.escape(value, {'"': '"', "'": '''})
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def utf8(value):
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"""Try to turn a string into utf-8 if possible.
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Code is directly from the utf8 function in
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http://github.com/facebook/tornado/blob/master/tornado/escape.py
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"""
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if isinstance(value, unicode):
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return value.encode('utf-8')
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assert isinstance(value, str)
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return value
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def ec2_error_response(request_id, code, message, status=500):
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"""Helper to construct an EC2 compatible error response."""
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LOG.debug('EC2 error response: %(code)s: %(message)s',
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{'code': code, 'message': message})
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resp = webob.Response()
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resp.status = status
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resp.headers['Content-Type'] = 'text/xml'
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resp.body = str('<?xml version="1.0"?>\n'
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'<Response><Errors><Error><Code>%s</Code>'
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'<Message>%s</Message></Error></Errors>'
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'<RequestID>%s</RequestID></Response>' %
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(xhtml_escape(utf8(code)),
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xhtml_escape(utf8(message)),
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xhtml_escape(utf8(request_id))))
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return resp
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class Fault(webob.exc.HTTPException):
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"""Captures exception and return REST Response."""
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def __init__(self, exception):
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"""Create a response for the given webob.exc.exception."""
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self.wrapped_exc = exception
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@webob.dec.wsgify
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def __call__(self, req):
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"""Generate a WSGI response based on the exception passed to ctor."""
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code = ec2api.api.exception_to_ec2code(self.wrapped_exc)
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status = self.wrapped_exc.status_int
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message = self.wrapped_exc.explanation
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if status == 501:
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message = "The requested function is not supported"
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if 'AWSAccessKeyId' not in req.params:
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raise webob.exc.HTTPBadRequest()
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user_id, _sep, project_id = req.params['AWSAccessKeyId'].partition(':')
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project_id = project_id or user_id
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remote_address = getattr(req, 'remote_address', '127.0.0.1')
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if CONF.use_forwarded_for:
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remote_address = req.headers.get('X-Forwarded-For', remote_address)
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resp = ec2_error_response(context.generate_request_id(), code,
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message=message, status=status)
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return resp
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