1f262daf6f
This is to ensure that there are no projects that try to import `minio/minio/pkg` into their own repo. Any such common packages should go to `https://github.com/minio/pkg`
122 lines
3.1 KiB
Go
122 lines
3.1 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package replication
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import (
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"encoding/xml"
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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 replication configuration Rule.
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type Filter struct {
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XMLName xml.Name `xml:"Filter" json:"Filter"`
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Prefix string
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And And
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Tag Tag
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// Caching tags, only once
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cachedTags map[string]struct{}
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}
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// IsEmpty returns true if filter is not set
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func (f Filter) IsEmpty() bool {
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return f.And.isEmpty() && f.Tag.IsEmpty() && f.Prefix == ""
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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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// TestTags tests if the object tags satisfy the Filter tags requirement,
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// it returns true if there is no tags in the underlying Filter.
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func (f *Filter) TestTags(ttags []string) bool {
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if f.cachedTags == nil {
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tags := make(map[string]struct{})
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for _, t := range append(f.And.Tags, f.Tag) {
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if !t.IsEmpty() {
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tags[t.String()] = struct{}{}
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}
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}
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f.cachedTags = tags
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}
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for ct := range f.cachedTags {
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foundTag := false
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for _, t := range ttags {
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if ct == t {
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foundTag = true
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break
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}
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}
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if !foundTag {
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return false
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}
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}
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return true
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}
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