120 lines
3 KiB
Go
120 lines
3 KiB
Go
/*
|
|
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
package replication
|
|
|
|
import (
|
|
"encoding/xml"
|
|
)
|
|
|
|
var (
|
|
errInvalidFilter = Errorf("Filter must have exactly one of Prefix, Tag, or And specified")
|
|
)
|
|
|
|
// Filter - a filter for a replication configuration Rule.
|
|
type Filter struct {
|
|
XMLName xml.Name `xml:"Filter" json:"Filter"`
|
|
Prefix string
|
|
And And
|
|
Tag Tag
|
|
// Caching tags, only once
|
|
cachedTags map[string]struct{}
|
|
}
|
|
|
|
// IsEmpty returns true if filter is not set
|
|
func (f Filter) IsEmpty() bool {
|
|
return f.And.isEmpty() && f.Tag.IsEmpty() && f.Prefix == ""
|
|
}
|
|
|
|
// MarshalXML - produces the xml representation of the Filter struct
|
|
// only one of Prefix, And and Tag should be present in the output.
|
|
func (f Filter) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
|
|
if err := e.EncodeToken(start); err != nil {
|
|
return err
|
|
}
|
|
|
|
switch {
|
|
case !f.And.isEmpty():
|
|
if err := e.EncodeElement(f.And, xml.StartElement{Name: xml.Name{Local: "And"}}); err != nil {
|
|
return err
|
|
}
|
|
case !f.Tag.IsEmpty():
|
|
if err := e.EncodeElement(f.Tag, xml.StartElement{Name: xml.Name{Local: "Tag"}}); err != nil {
|
|
return err
|
|
}
|
|
default:
|
|
// Always print Prefix field when both And & Tag are empty
|
|
if err := e.EncodeElement(f.Prefix, xml.StartElement{Name: xml.Name{Local: "Prefix"}}); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return e.EncodeToken(xml.EndElement{Name: start.Name})
|
|
}
|
|
|
|
// Validate - validates the filter element
|
|
func (f Filter) Validate() error {
|
|
// A Filter must have exactly one of Prefix, Tag, or And specified.
|
|
if !f.And.isEmpty() {
|
|
if f.Prefix != "" {
|
|
return errInvalidFilter
|
|
}
|
|
if !f.Tag.IsEmpty() {
|
|
return errInvalidFilter
|
|
}
|
|
if err := f.And.Validate(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if f.Prefix != "" {
|
|
if !f.Tag.IsEmpty() {
|
|
return errInvalidFilter
|
|
}
|
|
}
|
|
if !f.Tag.IsEmpty() {
|
|
if err := f.Tag.Validate(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// TestTags tests if the object tags satisfy the Filter tags requirement,
|
|
// it returns true if there is no tags in the underlying Filter.
|
|
func (f *Filter) TestTags(ttags []string) bool {
|
|
if f.cachedTags == nil {
|
|
tags := make(map[string]struct{})
|
|
for _, t := range append(f.And.Tags, f.Tag) {
|
|
if !t.IsEmpty() {
|
|
tags[t.String()] = struct{}{}
|
|
}
|
|
}
|
|
f.cachedTags = tags
|
|
}
|
|
for ct := range f.cachedTags {
|
|
foundTag := false
|
|
for _, t := range ttags {
|
|
if ct == t {
|
|
foundTag = true
|
|
break
|
|
}
|
|
}
|
|
if !foundTag {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|