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106 lines
2.9 KiB
Go
106 lines
2.9 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 lifecycle
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import (
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"encoding/xml"
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)
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var errDuplicateTagKey = Errorf("Duplicate Tag Keys are not allowed")
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// And - a tag to combine a prefix and multiple tags for lifecycle configuration rule.
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type And struct {
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XMLName xml.Name `xml:"And"`
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ObjectSizeGreaterThan int64 `xml:"ObjectSizeGreaterThan,omitempty"`
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ObjectSizeLessThan int64 `xml:"ObjectSizeLessThan,omitempty"`
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Prefix Prefix `xml:"Prefix,omitempty"`
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Tags []Tag `xml:"Tag,omitempty"`
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}
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// isEmpty returns true if Tags field is null
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func (a And) isEmpty() bool {
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return len(a.Tags) == 0 && !a.Prefix.set &&
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a.ObjectSizeGreaterThan == 0 && a.ObjectSizeLessThan == 0
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}
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// Validate - validates the And field
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func (a And) Validate() error {
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// > This is used in a Lifecycle Rule Filter to apply a logical AND to two or more predicates.
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// ref: https://docs.aws.amazon.com/AmazonS3/latest/API/API_LifecycleRuleAndOperator.html
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// i.e, predCount >= 2
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var predCount int
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if a.Prefix.set {
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predCount++
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}
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predCount += len(a.Tags)
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if a.ObjectSizeGreaterThan > 0 {
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predCount++
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}
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if a.ObjectSizeLessThan > 0 {
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predCount++
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}
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if predCount < 2 {
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return errXMLNotWellFormed
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}
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if a.ContainsDuplicateTag() {
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return errDuplicateTagKey
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}
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for _, t := range a.Tags {
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if err := t.Validate(); err != nil {
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return err
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}
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}
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if a.ObjectSizeGreaterThan < 0 || a.ObjectSizeLessThan < 0 {
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return errXMLNotWellFormed
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}
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return nil
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}
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// ContainsDuplicateTag - returns true if duplicate keys are present in And
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func (a And) ContainsDuplicateTag() bool {
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x := make(map[string]struct{}, len(a.Tags))
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for _, t := range a.Tags {
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if _, has := x[t.Key]; has {
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return true
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}
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x[t.Key] = struct{}{}
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}
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return false
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}
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// BySize returns true when sz satisfies a
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// ObjectSizeLessThan/ObjectSizeGreaterthan or a logical AND of these predicates
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// Note: And combines size and other predicates like Tags, Prefix, etc. This
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// method applies exclusively to size predicates only.
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func (a And) BySize(sz int64) bool {
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if a.ObjectSizeGreaterThan > 0 &&
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sz <= a.ObjectSizeGreaterThan {
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return false
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}
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if a.ObjectSizeLessThan > 0 &&
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sz >= a.ObjectSizeLessThan {
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return false
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}
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return true
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}
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