e906b511e9
* lifecycle: Consider multiple tags filtering * lifecycle: Disallow duplicated Key/Value xml in <Tag>
102 lines
2.3 KiB
Go
102 lines
2.3 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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"io"
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"unicode/utf8"
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)
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// Tag - a tag for a lifecycle configuration Rule filter.
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type Tag struct {
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XMLName xml.Name `xml:"Tag"`
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Key string `xml:"Key,omitempty"`
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Value string `xml:"Value,omitempty"`
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}
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var (
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errInvalidTagKey = Errorf("The TagKey you have provided is invalid")
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errInvalidTagValue = Errorf("The TagValue you have provided is invalid")
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errDuplicatedXMLTag = Errorf("duplicated XML Tag")
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errUnknownXMLTag = Errorf("unknown XML Tag")
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)
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// UnmarshalXML - decodes XML data.
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func (tag *Tag) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (err error) {
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var keyAlreadyParsed, valueAlreadyParsed bool
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for {
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// Read tokens from the XML document in a stream.
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t, err := d.Token()
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if err != nil {
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if err == io.EOF {
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break
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}
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return err
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}
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switch se := t.(type) {
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case xml.StartElement:
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var s string
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if err = d.DecodeElement(&s, &se); err != nil {
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return err
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}
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switch se.Name.Local {
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case "Key":
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if keyAlreadyParsed {
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return errDuplicatedXMLTag
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}
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tag.Key = s
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keyAlreadyParsed = true
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case "Value":
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if valueAlreadyParsed {
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return errDuplicatedXMLTag
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}
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tag.Value = s
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valueAlreadyParsed = true
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default:
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return errUnknownXMLTag
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}
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}
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}
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return nil
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}
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func (tag Tag) String() string {
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return tag.Key + "=" + tag.Value
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}
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// IsEmpty returns whether this tag is empty or not.
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func (tag Tag) IsEmpty() bool {
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return tag.Key == ""
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}
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// Validate checks this tag.
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func (tag Tag) Validate() error {
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if len(tag.Key) == 0 || utf8.RuneCountInString(tag.Key) > 128 {
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return errInvalidTagKey
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}
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if utf8.RuneCountInString(tag.Value) > 256 {
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return errInvalidTagValue
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}
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return nil
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}
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