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# Copyright (c) 2010-2014 OpenStack Foundation.
#
# 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.
import json
from swift.common.http import HTTP_OK, HTTP_PARTIAL_CONTENT, HTTP_NO_CONTENT
from swift.common.request_helpers import update_etag_is_at_header
from swift.common.swob import Range, content_range_header_value, \
normalize_etag
from swift.common.utils import public, list_from_csv, get_swift_info
from swift.common.middleware.versioned_writes.object_versioning import \
DELETE_MARKER_CONTENT_TYPE
from swift.common.middleware.s3api.utils import S3Timestamp, sysmeta_header
from swift.common.middleware.s3api.controllers.base import Controller
from swift.common.middleware.s3api.s3response import S3NotImplemented, \
InvalidRange, NoSuchKey, InvalidArgument, HTTPNoContent, \
PreconditionFailed
class ObjectController(Controller):
"""
Handles requests on objects
"""
def _gen_head_range_resp(self, req_range, resp):
"""
Swift doesn't handle Range header for HEAD requests.
So, this method generates HEAD range response from HEAD response.
S3 return HEAD range response, if the value of range satisfies the
conditions which are described in the following document.
- http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
"""
length = int(resp.headers.get('Content-Length'))
try:
content_range = Range(req_range)
except ValueError:
return resp
ranges = content_range.ranges_for_length(length)
if ranges == []:
raise InvalidRange()
elif ranges:
if len(ranges) == 1:
start, end = ranges[0]
resp.headers['Content-Range'] = \
content_range_header_value(start, end, length)
resp.headers['Content-Length'] = (end - start)
resp.status = HTTP_PARTIAL_CONTENT
return resp
else:
# TODO: It is necessary to confirm whether need to respond to
# multi-part response.(e.g. bytes=0-10,20-30)
pass
return resp
def GETorHEAD(self, req):
had_match = False
for match_header in ('if-match', 'if-none-match'):
if match_header not in req.headers:
continue
had_match = True
for value in list_from_csv(req.headers[match_header]):
value = normalize_etag(value)
if value.endswith('-N'):
# Deal with fake S3-like etags for SLOs uploaded via Swift
req.headers[match_header] += ', ' + value[:-2]
if had_match:
# Update where to look
update_etag_is_at_header(req, sysmeta_header('object', 'etag'))
object_name = req.object_name
version_id = req.params.get('versionId')
if version_id not in ('null', None) and \
'object_versioning' not in get_swift_info():
raise S3NotImplemented()
query = {} if version_id is None else {'version-id': version_id}
resp = req.get_response(self.app, query=query)
if req.method == 'HEAD':
resp.app_iter = None
if 'x-amz-meta-deleted' in resp.headers:
raise NoSuchKey(object_name)
for key in ('content-type', 'content-language', 'expires',
'cache-control', 'content-disposition',
'content-encoding'):
if 'response-' + key in req.params:
resp.headers[key] = req.params['response-' + key]
return resp
@public
def HEAD(self, req):
"""
Handle HEAD Object request
"""
resp = self.GETorHEAD(req)
if 'range' in req.headers:
req_range = req.headers['range']
resp = self._gen_head_range_resp(req_range, resp)
return resp
@public
def GET(self, req):
"""
Handle GET Object request
"""
return self.GETorHEAD(req)
@public
def PUT(self, req):
"""
Handle PUT Object and PUT Object (Copy) request
"""
# set X-Timestamp by s3api to use at copy resp body
req_timestamp = S3Timestamp.now()
req.headers['X-Timestamp'] = req_timestamp.internal
if all(h in req.headers
for h in ('X-Amz-Copy-Source', 'X-Amz-Copy-Source-Range')):
raise InvalidArgument('x-amz-copy-source-range',
req.headers['X-Amz-Copy-Source-Range'],
'Illegal copy header')
req.check_copy_source(self.app)
if not req.headers.get('Content-Type'):
# can't setdefault because it can be None for some reason
req.headers['Content-Type'] = 'binary/octet-stream'
resp = req.get_response(self.app)
if 'X-Amz-Copy-Source' in req.headers:
resp.append_copy_resp_body(req.controller_name,
req_timestamp.s3xmlformat)
# delete object metadata from response
for key in list(resp.headers.keys()):
if key.lower().startswith('x-amz-meta-'):
del resp.headers[key]
resp.status = HTTP_OK
return resp
@public
def POST(self, req):
raise S3NotImplemented()
def _restore_on_delete(self, req):
resp = req.get_response(self.app, 'GET', req.container_name, '',
query={'prefix': req.object_name,
'versions': True})
if resp.status_int != HTTP_OK:
return resp
old_versions = json.loads(resp.body)
resp = None
for item in old_versions:
if item['content_type'] == DELETE_MARKER_CONTENT_TYPE:
resp = None
break
try:
resp = req.get_response(self.app, 'PUT', query={
'version-id': item['version_id']})
except PreconditionFailed:
self.logger.debug('skipping failed PUT?version-id=%s' %
item['version_id'])
continue
# if that worked, we'll go ahead and fix up the status code
resp.status_int = HTTP_NO_CONTENT
break
return resp
@public
def DELETE(self, req):
"""
Handle DELETE Object request
"""
if 'versionId' in req.params and \
req.params['versionId'] != 'null' and \
'object_versioning' not in get_swift_info():
raise S3NotImplemented()
try:
try:
query = req.gen_multipart_manifest_delete_query(
self.app, version=req.params.get('versionId'))
except NoSuchKey:
query = {}
req.headers['Content-Type'] = None # Ignore client content-type
if 'versionId' in req.params:
query['version-id'] = req.params['versionId']
query['symlink'] = 'get'
resp = req.get_response(self.app, query=query)
if query.get('multipart-manifest') and resp.status_int == HTTP_OK:
for chunk in resp.app_iter:
pass # drain the bulk-deleter response
resp.status = HTTP_NO_CONTENT
resp.body = b''
if resp.sw_headers.get('X-Object-Current-Version-Id') == 'null':
new_resp = self._restore_on_delete(req)
if new_resp:
resp = new_resp
except NoSuchKey:
# expect to raise NoSuchBucket when the bucket doesn't exist
req.get_container_info(self.app)
# else -- it's gone! Success.
return HTTPNoContent()
return resp
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