124 lines
4.9 KiB
Python
124 lines
4.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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A filter middleware that inspects the requested URI for a version string
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and/or Accept headers and attempts to negotiate an API controller to
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return
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"""
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import logging
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import re
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import routes
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from heat.api import v1
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from heat.api import versions
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from heat.common import wsgi
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logger = logging.getLogger('heat.api.middleware.version_negotiation')
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class VersionNegotiationFilter(wsgi.Middleware):
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def __init__(self, app, conf, **local_conf):
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self.versions_app = versions.Controller(conf)
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self.version_uri_regex = re.compile(r"^v(\d+)\.?(\d+)?")
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self.conf = conf
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super(VersionNegotiationFilter, self).__init__(app)
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def process_request(self, req):
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"""
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If there is a version identifier in the URI, simply
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return the correct API controller, otherwise, if we
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find an Accept: header, process it
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"""
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# See if a version identifier is in the URI passed to
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# us already. If so, simply return the right version
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# API controller
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msg = _("Processing request: %(method)s %(path)s Accept: "
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"%(accept)s") % ({'method': req.method,
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'path': req.path, 'accept': req.accept})
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logger.debug(msg)
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# If the request is for /versions, just return the versions container
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if req.path_info_peek() == "versions":
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return self.versions_app
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match = self._match_version_string(req.path_info_peek(), req)
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if match:
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if (req.environ['api.major_version'] == 1 and
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req.environ['api.minor_version'] == 0):
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logger.debug(_("Matched versioned URI. Version: %d.%d"),
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req.environ['api.major_version'],
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req.environ['api.minor_version'])
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# Strip the version from the path
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req.path_info_pop()
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return None
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else:
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logger.debug(_("Unknown version in versioned URI: %d.%d. "
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"Returning version choices."),
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req.environ['api.major_version'],
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req.environ['api.minor_version'])
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return self.versions_app
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accept = str(req.accept)
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if accept.startswith('application/vnd.openstack.images-'):
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token_loc = len('application/vnd.openstack.images-')
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accept_version = accept[token_loc:]
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match = self._match_version_string(accept_version, req)
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if match:
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if (req.environ['api.major_version'] == 1 and
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req.environ['api.minor_version'] == 0):
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logger.debug(_("Matched versioned media type. "
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"Version: %d.%d"),
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req.environ['api.major_version'],
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req.environ['api.minor_version'])
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return None
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else:
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logger.debug(_("Unknown version in accept header: %d.%d..."
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"returning version choices."),
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req.environ['api.major_version'],
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req.environ['api.minor_version'])
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return self.versions_app
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else:
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if req.accept not in ('*/*', ''):
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logger.debug(_("Unknown accept header: %s..."
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"returning version choices."), req.accept)
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return self.versions_app
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return None
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def _match_version_string(self, subject, req):
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"""
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Given a subject string, tries to match a major and/or
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minor version number. If found, sets the api.major_version
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and api.minor_version environ variables.
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Returns True if there was a match, false otherwise.
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:param subject: The string to check
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:param req: Webob.Request object
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"""
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match = self.version_uri_regex.match(subject)
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if match:
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major_version, minor_version = match.groups(0)
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major_version = int(major_version)
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minor_version = int(minor_version)
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req.environ['api.major_version'] = major_version
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req.environ['api.minor_version'] = minor_version
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return match is not None
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