95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 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 few utility routines used throughout Glance
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"""
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def image_meta_to_http_headers(image_meta):
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"""
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Returns a set of image metadata into a dict
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of HTTP headers that can be fed to either a Webob
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Request object or an httplib.HTTP(S)Connection object
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:param image_meta: Mapping of image metadata
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"""
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headers = {}
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for k, v in image_meta.items():
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if k == 'properties':
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for pk, pv in v.items():
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headers["x-image-meta-property-%s"
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% pk.lower()] = pv
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headers["x-image-meta-%s" % k.lower()] = v
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return headers
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def inject_image_meta_into_headers(response, image_meta):
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"""
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Given a response and mapping of image metadata, injects
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the Response with a set of HTTP headers for the image
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metadata. Each main image metadata field is injected
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as a HTTP header with key 'x-image-meta-<FIELD>' except
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for the properties field, which is further broken out
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into a set of 'x-image-meta-property-<KEY>' headers
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:param response: The Webob Response object
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:param image_meta: Mapping of image metadata
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"""
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headers = image_meta_to_http_headers(image_meta)
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for k, v in headers.items():
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response.headers.add(k, v)
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def get_image_meta_from_headers(response):
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"""
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Processes HTTP headers from a supplied response that
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match the x-image-meta and x-image-meta-property and
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returns a mapping of image metadata and properties
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:param response: Response to process
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"""
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result = {}
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properties = {}
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if hasattr(response, 'getheaders'): # httplib.HTTPResponse
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headers = response.getheaders()
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else: # webob.Response
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headers = response.headers.items()
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for key, value in headers:
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key = str(key.lower())
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if key.startswith('x-image-meta-property-'):
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field_name = key[len('x-image-meta-property-'):].replace('-', '_')
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properties[field_name] = value
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elif key.startswith('x-image-meta-'):
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field_name = key[len('x-image-meta-'):].replace('-', '_')
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result[field_name] = value
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result['properties'] = properties
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return result
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def has_body(req):
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"""
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Returns whether a Webob.Request object will possess an entity body.
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:param req: Webob.Request object
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"""
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return req.content_length or 'transfer-encoding' in req.headers
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