Python request_helpers.is_sys_meta函数代码示例

    def register(self, method, path, response_class, headers, body):
        # assuming the path format like /v1/account/container/object
        resource_map = ['account', 'container', 'object']
        acos = filter(None, split_path(path, 0, 4, True)[1:])
        index = len(acos) - 1
        resource = resource_map[index]
        if (method, path) in self._responses:
            old_headers = self._responses[(method, path)][1]
            headers = headers.copy()
            for key, value in old_headers.iteritems():
                if is_sys_meta(resource, key) and key not in headers:
                    # keep old sysmeta for s3acl
                    headers.update({key: value})

        self._responses[(method, path)] = (response_class, headers, body)

    def register(self, method, path, response_class, headers, body):
        # assuming the path format like /v1/account/container/object
        resource_map = ['account', 'container', 'object']
        index = len(list(filter(None, split_path(path, 0, 4, True)[1:]))) - 1
        resource = resource_map[index]
        if (method, path) in self._responses:
            old_headers = self._responses[(method, path)][1]
            headers = headers.copy()
            for key, value in old_headers.items():
                if is_sys_meta(resource, key) and key not in headers:
                    # keep old sysmeta for s3acl
                    headers.update({key: value})

        if body is not None and not isinstance(body, (bytes, list)):
            body = body.encode('utf8')
        self._responses[(method, path)] = (response_class, headers, body)

 def write_metadata(self, metadata):
     """
     Write a block of metadata to an object.
     """
     data, cur_mdata = self._filesystem.get_object(self._name)
     if data is not None:
         # The object exists. Update the new metadata with the object's
         # immutable metadata (e.g. name, size, etag, sysmeta) and store it
         # with the object data.
         immutable_metadata = dict(
             [(key, val) for key, val in cur_mdata.items()
              if key.lower() in DATAFILE_SYSTEM_META
              or is_sys_meta('object', key)])
         metadata.update(immutable_metadata)
         metadata['name'] = self._name
         self._filesystem.put_object(self._name, data, metadata)

def _prep_headers_to_info(headers, server_type):
    """
    Helper method that iterates once over a dict of headers,
    converting all keys to lower case and separating
    into subsets containing user metadata, system metadata
    and other headers.
    """
    meta = {}
    sysmeta = {}
    other = {}
    for key, val in dict(headers).iteritems():
        lkey = key.lower()
        if is_user_meta(server_type, lkey):
            meta[strip_user_meta_prefix(server_type, lkey)] = val
        elif is_sys_meta(server_type, lkey):
            sysmeta[strip_sys_meta_prefix(server_type, lkey)] = val
        else:
            other[lkey] = val
    return other, meta, sysmeta

    def merge_df_mf_metadata(df_md_source, mf_md_source):
        """Merge the datafile metadata and metafile metadata dictionaries together.

        Datafile metadata refers to metadata originally included when the object
        was first PUT, and does not include metadata set by any subsequent POST.

        Metafile metadata refers to metadata written by a POST, and does not
        include any persistent metadata that was set by the original PUT.
        """
        md_dest = {}

        if not mf_md_source:
            md_dest.update(df_md_source)
        else:
            sys_metadata = {
                key: val for key, val in df_md_source.items() if key.lower() in
                (RESERVED_DATAFILE_META | DATAFILE_SYSTEM_META) or is_sys_meta('object', key)
            }
            md_dest.update(mf_md_source)
            md_dest.update(sys_metadata)

        return md_dest

def print_obj_metadata(metadata):
    """
    Print out basic info and metadata from object, as returned from
    :func:`swift.obj.diskfile.read_metadata`.

    Metadata should include the keys: name, Content-Type, and
    X-Timestamp.

    Additional metadata is displayed unmodified.

    :param metadata: dict of object metadata

    :raises: ValueError
    """
    user_metadata = {}
    sys_metadata = {}
    other_metadata = {}

    if not metadata:
        raise ValueError('Metadata is None')
    path = metadata.pop('name', '')
    content_type = metadata.pop('Content-Type', '')
    ts = Timestamp(metadata.pop('X-Timestamp', 0))
    account = container = obj = obj_hash = None
    if path:
        try:
            account, container, obj = path.split('/', 3)[1:]
        except ValueError:
            raise ValueError('Path is invalid for object %r' % path)
        else:
            obj_hash = hash_path(account, container, obj)
        print 'Path: %s' % path
        print '  Account: %s' % account
        print '  Container: %s' % container
        print '  Object: %s' % obj
        print '  Object hash: %s' % obj_hash
    else:
        print 'Path: Not found in metadata'
    if content_type:
        print 'Content-Type: %s' % content_type
    else:
        print 'Content-Type: Not found in metadata'
    if ts:
        print ('Timestamp: %s (%s)' % (ts.isoformat, ts.internal))
    else:
        print 'Timestamp: Not found in metadata'

    for key, value in metadata.iteritems():
        if is_user_meta('Object', key):
            user_metadata[key] = value
        elif is_sys_meta('Object', key):
            sys_metadata[key] = value
        else:
            other_metadata[key] = value

    def print_metadata(title, items):
        print title
        if items:
            for meta_key in sorted(items):
                print '  %s: %s' % (meta_key, items[meta_key])
        else:
            print '  No metadata found'

    print_metadata('System Metadata:', sys_metadata)
    print_metadata('User Metadata:', user_metadata)
    print_metadata('Other Metadata:', other_metadata)

def print_obj_metadata(metadata, drop_prefixes=False):
    """
    Print out basic info and metadata from object, as returned from
    :func:`swift.obj.diskfile.read_metadata`.

    Metadata should include the keys: name, Content-Type, and
    X-Timestamp.

    Additional metadata is displayed unmodified.

    :param metadata: dict of object metadata
    :param drop_prefixes: if True, strip "X-Object-Meta-", "X-Object-Sysmeta-",
                          and "X-Object-Transient-Sysmeta-" when displaying
                          User Metadata, System Metadata, and Transient
                          System Metadata entries

    :raises ValueError:
    """
    user_metadata = {}
    sys_metadata = {}
    transient_sys_metadata = {}
    other_metadata = {}

    if not metadata:
        raise ValueError('Metadata is None')
    path = metadata.pop('name', '')
    content_type = metadata.pop('Content-Type', '')
    ts = Timestamp(metadata.pop('X-Timestamp', 0))
    account = container = obj = obj_hash = None
    if path:
        try:
            account, container, obj = path.split('/', 3)[1:]
        except ValueError:
            raise ValueError('Path is invalid for object %r' % path)
        else:
            obj_hash = hash_path(account, container, obj)
        print('Path: %s' % path)
        print('  Account: %s' % account)
        print('  Container: %s' % container)
        print('  Object: %s' % obj)
        print('  Object hash: %s' % obj_hash)
    else:
        print('Path: Not found in metadata')
    if content_type:
        print('Content-Type: %s' % content_type)
    else:
        print('Content-Type: Not found in metadata')
    if ts:
        print('Timestamp: %s (%s)' % (ts.isoformat, ts.internal))
    else:
        print('Timestamp: Not found in metadata')

    for key, value in metadata.items():
        if is_user_meta('Object', key):
            if drop_prefixes:
                key = strip_user_meta_prefix('Object', key)
            user_metadata[key] = value
        elif is_sys_meta('Object', key):
            if drop_prefixes:
                key = strip_sys_meta_prefix('Object', key)
            sys_metadata[key] = value
        elif is_object_transient_sysmeta(key):
            if drop_prefixes:
                key = strip_object_transient_sysmeta_prefix(key)
            transient_sys_metadata[key] = value
        else:
            other_metadata[key] = value

    def print_metadata(title, items):
        print(title)
        if items:
            for key, value in sorted(items.items()):
                print('  %s: %s' % (key, value))
        else:
            print('  No metadata found')

    print_metadata('System Metadata:', sys_metadata)
    print_metadata('Transient System Metadata:', transient_sys_metadata)
    print_metadata('User Metadata:', user_metadata)
    print_metadata('Other Metadata:', other_metadata)

def print_db_info_metadata(db_type, info, metadata, drop_prefixes=False):
    """
    print out data base info/metadata based on its type

    :param db_type: database type, account or container
    :param info: dict of data base info
    :param metadata: dict of data base metadata
    :param drop_prefixes: if True, strip "X-Account-Meta-",
                          "X-Container-Meta-", "X-Account-Sysmeta-", and
                          "X-Container-Sysmeta-" when displaying
                          User Metadata and System Metadata dicts
    """
    if info is None:
        raise ValueError('DB info is None')

    if db_type not in ['container', 'account']:
        raise ValueError('Wrong DB type')

    try:
        account = info['account']
        container = None

        if db_type == 'container':
            container = info['container']
            path = '/%s/%s' % (account, container)
        else:
            path = '/%s' % account

        print('Path: %s' % path)
        print('  Account: %s' % account)

        if db_type == 'container':
            print('  Container: %s' % container)

        path_hash = hash_path(account, container)
        if db_type == 'container':
            print('  Container Hash: %s' % path_hash)
        else:
            print('  Account Hash: %s' % path_hash)

        print('Metadata:')
        print('  Created at: %s (%s)' %
              (Timestamp(info['created_at']).isoformat,
               info['created_at']))
        print('  Put Timestamp: %s (%s)' %
              (Timestamp(info['put_timestamp']).isoformat,
               info['put_timestamp']))
        print('  Delete Timestamp: %s (%s)' %
              (Timestamp(info['delete_timestamp']).isoformat,
               info['delete_timestamp']))
        print('  Status Timestamp: %s (%s)' %
              (Timestamp(info['status_changed_at']).isoformat,
               info['status_changed_at']))
        if db_type == 'account':
            print('  Container Count: %s' % info['container_count'])
        print('  Object Count: %s' % info['object_count'])
        print('  Bytes Used: %s' % info['bytes_used'])
        if db_type == 'container':
            try:
                policy_name = POLICIES[info['storage_policy_index']].name
            except KeyError:
                policy_name = 'Unknown'
            print('  Storage Policy: %s (%s)' % (
                policy_name, info['storage_policy_index']))
            print('  Reported Put Timestamp: %s (%s)' %
                  (Timestamp(info['reported_put_timestamp']).isoformat,
                   info['reported_put_timestamp']))
            print('  Reported Delete Timestamp: %s (%s)' %
                  (Timestamp(info['reported_delete_timestamp']).isoformat,
                   info['reported_delete_timestamp']))
            print('  Reported Object Count: %s' %
                  info['reported_object_count'])
            print('  Reported Bytes Used: %s' % info['reported_bytes_used'])
        print('  Chexor: %s' % info['hash'])
        print('  UUID: %s' % info['id'])
    except KeyError as e:
        raise ValueError('Info is incomplete: %s' % e)

    meta_prefix = 'x_' + db_type + '_'
    for key, value in info.items():
        if key.lower().startswith(meta_prefix):
            title = key.replace('_', '-').title()
            print('  %s: %s' % (title, value))
    user_metadata = {}
    sys_metadata = {}
    for key, (value, timestamp) in metadata.items():
        if is_user_meta(db_type, key):
            if drop_prefixes:
                key = strip_user_meta_prefix(db_type, key)
            user_metadata[key] = value
        elif is_sys_meta(db_type, key):
            if drop_prefixes:
                key = strip_sys_meta_prefix(db_type, key)
            sys_metadata[key] = value
        else:
            title = key.replace('_', '-').title()
            print('  %s: %s' % (title, value))
    if sys_metadata:
        print('  System Metadata: %s' % sys_metadata)
    else:
#.........这里部分代码省略.........

 def is_object_sysmeta(k):
     return is_sys_meta('object', k)

    def handle_PUT(self, req, start_response):
        if req.content_length:
            return HTTPBadRequest(body='Copy requests require a zero byte '
                                  'body', request=req,
                                  content_type='text/plain')(req.environ,
                                                             start_response)

        # Form the path of source object to be fetched
        ver, acct, _rest = req.split_path(2, 3, True)
        src_account_name = req.headers.get('X-Copy-From-Account')
        if src_account_name:
            src_account_name = check_account_format(req, src_account_name)
        else:
            src_account_name = acct
        src_container_name, src_obj_name = _check_copy_from_header(req)
        source_path = '/%s/%s/%s/%s' % (ver, src_account_name,
                                        src_container_name, src_obj_name)

        if req.environ.get('swift.orig_req_method', req.method) != 'POST':
            self.logger.info("Copying object from %s to %s" %
                             (source_path, req.path))

        # GET the source object, bail out on error
        ssc_ctx = ServerSideCopyWebContext(self.app, self.logger)
        source_resp = self._get_source_object(ssc_ctx, source_path, req)
        if source_resp.status_int >= HTTP_MULTIPLE_CHOICES:
            close_if_possible(source_resp.app_iter)
            return source_resp(source_resp.environ, start_response)

        # Create a new Request object based on the original req instance.
        # This will preserve env and headers.
        sink_req = Request.blank(req.path_info,
                                 environ=req.environ, headers=req.headers)

        params = sink_req.params
        if params.get('multipart-manifest') == 'get':
            if 'X-Static-Large-Object' in source_resp.headers:
                params['multipart-manifest'] = 'put'
            if 'X-Object-Manifest' in source_resp.headers:
                del params['multipart-manifest']
                sink_req.headers['X-Object-Manifest'] = \
                    source_resp.headers['X-Object-Manifest']
            sink_req.params = params

        # Set data source, content length and etag for the PUT request
        sink_req.environ['wsgi.input'] = FileLikeIter(source_resp.app_iter)
        sink_req.content_length = source_resp.content_length
        sink_req.etag = source_resp.etag

        # We no longer need these headers
        sink_req.headers.pop('X-Copy-From', None)
        sink_req.headers.pop('X-Copy-From-Account', None)
        # If the copy request does not explicitly override content-type,
        # use the one present in the source object.
        if not req.headers.get('content-type'):
            sink_req.headers['Content-Type'] = \
                source_resp.headers['Content-Type']

        fresh_meta_flag = config_true_value(
            sink_req.headers.get('x-fresh-metadata', 'false'))

        if fresh_meta_flag or 'swift.post_as_copy' in sink_req.environ:
            # Post-as-copy: ignore new sysmeta, copy existing sysmeta
            condition = lambda k: is_sys_meta('object', k)
            remove_items(sink_req.headers, condition)
            copy_header_subset(source_resp, sink_req, condition)
        else:
            # Copy/update existing sysmeta and user meta
            _copy_headers_into(source_resp, sink_req)
            # Copy/update new metadata provided in request if any
            _copy_headers_into(req, sink_req)

        # Create response headers for PUT response
        resp_headers = self._create_response_headers(source_path,
                                                     source_resp, sink_req)

        put_resp = ssc_ctx.send_put_req(sink_req, resp_headers, start_response)
        close_if_possible(source_resp.app_iter)
        return put_resp

 def test_is_sys_meta(self):
     m_type = 'sysmeta'
     for st in server_types:
         self.assertTrue(is_sys_meta(st, 'x-%s-%s-foo' % (st, m_type)))
         self.assertFalse(is_sys_meta(st, 'x-%s-%s-' % (st, m_type)))
         self.assertFalse(is_sys_meta(st, 'x-%s-%sfoo' % (st, m_type)))

    def handle_PUT(self, req, start_response):
        if req.content_length:
            return HTTPBadRequest(body='Copy requests require a zero byte '
                                  'body', request=req,
                                  content_type='text/plain')(req.environ,
                                                             start_response)

        # Form the path of source object to be fetched
        ver, acct, _rest = req.split_path(2, 3, True)
        src_account_name = req.headers.get('X-Copy-From-Account')
        if src_account_name:
            src_account_name = check_account_format(req, src_account_name)
        else:
            src_account_name = acct
        src_container_name, src_obj_name = _check_copy_from_header(req)
        source_path = '/%s/%s/%s/%s' % (ver, src_account_name,
                                        src_container_name, src_obj_name)

        if req.environ.get('swift.orig_req_method', req.method) != 'POST':
            self.logger.info("Copying object from %s to %s" %
                             (source_path, req.path))

        # GET the source object, bail out on error
        ssc_ctx = ServerSideCopyWebContext(self.app, self.logger)
        source_resp = self._get_source_object(ssc_ctx, source_path, req)
        if source_resp.status_int >= HTTP_MULTIPLE_CHOICES:
            close_if_possible(source_resp.app_iter)
            return source_resp(source_resp.environ, start_response)

        # Create a new Request object based on the original req instance.
        # This will preserve env and headers.
        sink_req = Request.blank(req.path_info,
                                 environ=req.environ, headers=req.headers)

        params = sink_req.params
        if params.get('multipart-manifest') == 'get':
            if 'X-Static-Large-Object' in source_resp.headers:
                params['multipart-manifest'] = 'put'
            if 'X-Object-Manifest' in source_resp.headers:
                del params['multipart-manifest']
                sink_req.headers['X-Object-Manifest'] = \
                    source_resp.headers['X-Object-Manifest']
            sink_req.params = params

        # Set data source, content length and etag for the PUT request
        sink_req.environ['wsgi.input'] = FileLikeIter(source_resp.app_iter)
        sink_req.content_length = source_resp.content_length
        if (source_resp.status_int == HTTP_OK and
                'X-Static-Large-Object' not in source_resp.headers and
                ('X-Object-Manifest' not in source_resp.headers or
                 req.params.get('multipart-manifest') == 'get')):
            # copy source etag so that copied content is verified, unless:
            #  - not a 200 OK response: source etag may not match the actual
            #    content, for example with a 206 Partial Content response to a
            #    ranged request
            #  - SLO manifest: etag cannot be specified in manifest PUT; SLO
            #    generates its own etag value which may differ from source
            #  - SLO: etag in SLO response is not hash of actual content
            #  - DLO: etag in DLO response is not hash of actual content
            sink_req.headers['Etag'] = source_resp.etag
        else:
            # since we're not copying the source etag, make sure that any
            # container update override values are not copied.
            remove_items(source_resp.headers, lambda k: k.startswith(
                'X-Object-Sysmeta-Container-Update-Override-'))

        # We no longer need these headers
        sink_req.headers.pop('X-Copy-From', None)
        sink_req.headers.pop('X-Copy-From-Account', None)
        # If the copy request does not explicitly override content-type,
        # use the one present in the source object.
        if not req.headers.get('content-type'):
            sink_req.headers['Content-Type'] = \
                source_resp.headers['Content-Type']

        fresh_meta_flag = config_true_value(
            sink_req.headers.get('x-fresh-metadata', 'false'))

        if fresh_meta_flag or 'swift.post_as_copy' in sink_req.environ:
            # Post-as-copy: ignore new sysmeta, copy existing sysmeta
            condition = lambda k: is_sys_meta('object', k)
            remove_items(sink_req.headers, condition)
            copy_header_subset(source_resp, sink_req, condition)
        else:
            # Copy/update existing sysmeta, transient-sysmeta and user meta
            _copy_headers(source_resp.headers, sink_req.headers)
            # Copy/update new metadata provided in request if any
            _copy_headers(req.headers, sink_req.headers)

        # Create response headers for PUT response
        resp_headers = self._create_response_headers(source_path,
                                                     source_resp, sink_req)

        put_resp = ssc_ctx.send_put_req(sink_req, resp_headers, start_response)
        close_if_possible(source_resp.app_iter)
        return put_resp

    def __init__(self, *args, **kwargs):
        swob.Response.__init__(self, *args, **kwargs)

        if self.etag:
            # add double quotes to the etag header
            self.etag = self.etag

        sw_sysmeta_headers = swob.HeaderKeyDict()
        sw_headers = swob.HeaderKeyDict()
        headers = HeaderKeyDict()
        self.is_slo = False

        def is_swift3_sysmeta(sysmeta_key, server_type):
            swift3_sysmeta_prefix = (
                'x-%s-sysmeta-swift3' % server_type).lower()
            return sysmeta_key.lower().startswith(swift3_sysmeta_prefix)

        def is_s3api_sysmeta(sysmeta_key, server_type):
            s3api_sysmeta_prefix = sysmeta_prefix(_server_type).lower()
            return sysmeta_key.lower().startswith(s3api_sysmeta_prefix)

        for key, val in self.headers.iteritems():
            if is_sys_meta('object', key) or is_sys_meta('container', key):
                _server_type = key.split('-')[1]
                if is_swift3_sysmeta(key, _server_type):
                    # To be compatible with older swift3, translate swift3
                    # sysmeta to s3api sysmeta here
                    key = sysmeta_prefix(_server_type) + \
                        key[len('x-%s-sysmeta-swift3-' % _server_type):]

                    if key not in sw_sysmeta_headers:
                        # To avoid overwrite s3api sysmeta by older swift3
                        # sysmeta set the key only when the key does not exist
                        sw_sysmeta_headers[key] = val
                elif is_s3api_sysmeta(key, _server_type):
                    sw_sysmeta_headers[key] = val
            else:
                sw_headers[key] = val

        # Handle swift headers
        for key, val in sw_headers.iteritems():
            _key = key.lower()

            if _key.startswith('x-object-meta-'):
                # Note that AWS ignores user-defined headers with '=' in the
                # header name. We translated underscores to '=5F' on the way
                # in, though.
                headers['x-amz-meta-' + _key[14:].replace('=5f', '_')] = val
            elif _key in ('content-length', 'content-type',
                          'content-range', 'content-encoding',
                          'content-disposition', 'content-language',
                          'etag', 'last-modified', 'x-robots-tag',
                          'cache-control', 'expires'):
                headers[key] = val
            elif _key == 'x-static-large-object':
                # for delete slo
                self.is_slo = config_true_value(val)

        self.headers = headers
        # Used for pure swift header handling at the request layer
        self.sw_headers = sw_headers
        self.sysmeta_headers = sw_sysmeta_headers

def print_db_info_metadata(db_type, info, metadata):
    """
    print out data base info/metadata based on its type

    :param db_type: database type, account or container
    :param info: dict of data base info
    :param metadata: dict of data base metadata
    """
    if info is None:
        raise ValueError("DB info is None")

    if db_type not in ["container", "account"]:
        raise ValueError("Wrong DB type")

    try:
        account = info["account"]
        container = None

        if db_type == "container":
            container = info["container"]
            path = "/%s/%s" % (account, container)
        else:
            path = "/%s" % account

        print "Path: %s" % path
        print "  Account: %s" % account

        if db_type == "container":
            print "  Container: %s" % container

        path_hash = hash_path(account, container)
        if db_type == "container":
            print "  Container Hash: %s" % path_hash
        else:
            print "  Account Hash: %s" % path_hash

        print "Metadata:"
        print ("  Created at: %s (%s)" % (datetime.utcfromtimestamp(float(info["created_at"])), info["created_at"]))
        print (
            "  Put Timestamp: %s (%s)"
            % (datetime.utcfromtimestamp(float(info["put_timestamp"])), info["put_timestamp"])
        )
        print (
            "  Delete Timestamp: %s (%s)"
            % (datetime.utcfromtimestamp(float(info["delete_timestamp"])), info["delete_timestamp"])
        )
        if db_type == "account":
            print "  Container Count: %s" % info["container_count"]
        print "  Object Count: %s" % info["object_count"]
        print "  Bytes Used: %s" % info["bytes_used"]
        if db_type == "container":
            print (
                "  Reported Put Timestamp: %s (%s)"
                % (datetime.utcfromtimestamp(float(info["reported_put_timestamp"])), info["reported_put_timestamp"])
            )
            print (
                "  Reported Delete Timestamp: %s (%s)"
                % (
                    datetime.utcfromtimestamp(float(info["reported_delete_timestamp"])),
                    info["reported_delete_timestamp"],
                )
            )
            print "  Reported Object Count: %s" % info["reported_object_count"]
            print "  Reported Bytes Used: %s" % info["reported_bytes_used"]
        print "  Chexor: %s" % info["hash"]
        print "  UUID: %s" % info["id"]
    except KeyError:
        raise ValueError("Info is incomplete")

    meta_prefix = "x_" + db_type + "_"
    for key, value in info.iteritems():
        if key.lower().startswith(meta_prefix):
            title = key.replace("_", "-").title()
            print "  %s: %s" % (title, value)
    user_metadata = {}
    sys_metadata = {}
    for key, (value, timestamp) in metadata.iteritems():
        if is_user_meta(db_type, key):
            user_metadata[strip_user_meta_prefix(db_type, key)] = value
        elif is_sys_meta(db_type, key):
            sys_metadata[strip_sys_meta_prefix(db_type, key)] = value
        else:
            title = key.replace("_", "-").title()
            print "  %s: %s" % (title, value)
    if sys_metadata:
        print "  System Metadata: %s" % sys_metadata
    else:
        print "No system metadata found in db file"

    if user_metadata:
        print "  User Metadata: %s" % user_metadata
    else:
        print "No user metadata found in db file"

    def _handle_copy_request(self, req):
        """
        This method handles copying objects based on values set in the headers
        'X-Copy-From' and 'X-Copy-From-Account'

        This method was added as part of the refactoring of the PUT method and
        the functionality is expected to be moved to middleware
        """
        if req.environ.get('swift.orig_req_method', req.method) != 'POST':
            req.environ.setdefault('swift.log_info', []).append(
                'x-copy-from:%s' % req.headers['X-Copy-From'])
        ver, acct, _rest = req.split_path(2, 3, True)
        src_account_name = req.headers.get('X-Copy-From-Account', None)
        if src_account_name:
            src_account_name = check_account_format(req, src_account_name)
        else:
            src_account_name = acct
        src_container_name, src_obj_name = check_copy_from_header(req)
        source_header = '/%s/%s/%s/%s' % (
            ver, src_account_name, src_container_name, src_obj_name)
        source_req = req.copy_get()

        # make sure the source request uses it's container_info
        source_req.headers.pop('X-Backend-Storage-Policy-Index', None)
        source_req.path_info = source_header
        source_req.headers['X-Newest'] = 'true'

        orig_obj_name = self.object_name
        orig_container_name = self.container_name
        orig_account_name = self.account_name
        sink_req = Request.blank(req.path_info,
                                 environ=req.environ, headers=req.headers)

        self.object_name = src_obj_name
        self.container_name = src_container_name
        self.account_name = src_account_name
        source_resp = self.GET(source_req)

        # This gives middlewares a way to change the source; for example,
        # this lets you COPY a SLO manifest and have the new object be the
        # concatenation of the segments (like what a GET request gives
        # the client), not a copy of the manifest file.
        hook = req.environ.get(
            'swift.copy_hook',
            (lambda source_req, source_resp, sink_req: source_resp))
        source_resp = hook(source_req, source_resp, sink_req)

        # reset names
        self.object_name = orig_obj_name
        self.container_name = orig_container_name
        self.account_name = orig_account_name

        if source_resp.status_int >= HTTP_MULTIPLE_CHOICES:
            # this is a bit of ugly code, but I'm willing to live with it
            # until copy request handling moves to middleware
            return source_resp, None, None, None
        if source_resp.content_length is None:
            # This indicates a transfer-encoding: chunked source object,
            # which currently only happens because there are more than
            # CONTAINER_LISTING_LIMIT segments in a segmented object. In
            # this case, we're going to refuse to do the server-side copy.
            raise HTTPRequestEntityTooLarge(request=req)
        if source_resp.content_length > constraints.MAX_FILE_SIZE:
            raise HTTPRequestEntityTooLarge(request=req)

        data_source = iter(source_resp.app_iter)
        sink_req.content_length = source_resp.content_length
        sink_req.etag = source_resp.etag

        # we no longer need the X-Copy-From header
        del sink_req.headers['X-Copy-From']
        if 'X-Copy-From-Account' in sink_req.headers:
            del sink_req.headers['X-Copy-From-Account']
        if not req.content_type_manually_set:
            sink_req.headers['Content-Type'] = \
                source_resp.headers['Content-Type']
        if config_true_value(
                sink_req.headers.get('x-fresh-metadata', 'false')):
            # post-as-copy: ignore new sysmeta, copy existing sysmeta
            condition = lambda k: is_sys_meta('object', k)
            remove_items(sink_req.headers, condition)
            copy_header_subset(source_resp, sink_req, condition)
        else:
            # copy/update existing sysmeta and user meta
            copy_headers_into(source_resp, sink_req)
            copy_headers_into(req, sink_req)

        # copy over x-static-large-object for POSTs and manifest copies
        if 'X-Static-Large-Object' in source_resp.headers and \
                req.params.get('multipart-manifest') == 'get':
            sink_req.headers['X-Static-Large-Object'] = \
                source_resp.headers['X-Static-Large-Object']

        req = sink_req

        def update_response(req, resp):
            acct, path = source_resp.environ['PATH_INFO'].split('/', 3)[2:4]
            resp.headers['X-Copied-From-Account'] = quote(acct)
            resp.headers['X-Copied-From'] = quote(path)
            if 'last-modified' in source_resp.headers:
#.........这里部分代码省略.........