93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, 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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*
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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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*/
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package lifecycle
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import (
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"encoding/xml"
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"github.com/minio/minio/pkg/bucket/object/tagging"
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)
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var (
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errInvalidFilter = Errorf("Filter must have exactly one of Prefix, Tag, or And specified")
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)
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// Filter - a filter for a lifecycle configuration Rule.
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type Filter struct {
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XMLName xml.Name `xml:"Filter"`
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Prefix string
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And And
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Tag tagging.Tag
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}
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// MarshalXML - produces the xml representation of the Filter struct
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// only one of Prefix, And and Tag should be present in the output.
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func (f Filter) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
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if err := e.EncodeToken(start); err != nil {
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return err
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}
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switch {
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case !f.And.isEmpty():
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if err := e.EncodeElement(f.And, xml.StartElement{Name: xml.Name{Local: "And"}}); err != nil {
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return err
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}
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case !f.Tag.IsEmpty():
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if err := e.EncodeElement(f.Tag, xml.StartElement{Name: xml.Name{Local: "Tag"}}); err != nil {
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return err
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}
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default:
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// Always print Prefix field when both And & Tag are empty
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if err := e.EncodeElement(f.Prefix, xml.StartElement{Name: xml.Name{Local: "Prefix"}}); err != nil {
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return err
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}
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}
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return e.EncodeToken(xml.EndElement{Name: start.Name})
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}
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// Validate - validates the filter element
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func (f Filter) Validate() error {
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// A Filter must have exactly one of Prefix, Tag, or And specified.
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if !f.And.isEmpty() {
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if f.Prefix != "" {
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return errInvalidFilter
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}
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if !f.Tag.IsEmpty() {
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return errInvalidFilter
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}
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if err := f.And.Validate(); err != nil {
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return err
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}
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}
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if f.Prefix != "" {
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if !f.Tag.IsEmpty() {
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return errInvalidFilter
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}
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}
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if !f.Tag.IsEmpty() {
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if err := f.Tag.Validate(); err != nil {
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return err
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}
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}
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return nil
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}
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// isEmpty - returns true if Filter tag is empty
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func (f Filter) isEmpty() bool {
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return f.And.isEmpty() && f.Prefix == "" && f.Tag == tagging.Tag{}
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}
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