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82 lines
2.0 KiB
82 lines
2.0 KiB
/*
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* MinIO Cloud Storage, (C) 2020 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 tagging
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import (
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"encoding/xml"
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"strings"
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"unicode/utf8"
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)
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// Tag - single tag
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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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// Validate - validates the tag element
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func (t Tag) Validate() error {
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if err := t.validateKey(); err != nil {
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return err
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}
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if err := t.validateValue(); err != nil {
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return err
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}
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return nil
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}
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// validateKey - checks if key is valid or not.
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func (t Tag) validateKey() error {
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// cannot be longer than maxTagKeyLength characters
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if utf8.RuneCountInString(t.Key) > maxTagKeyLength {
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return ErrInvalidTagKey
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}
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// cannot be empty
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if len(t.Key) == 0 {
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return ErrInvalidTagKey
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}
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// Tag key shouldn't have "&"
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if strings.Contains(t.Key, "&") {
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return ErrInvalidTagKey
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}
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return nil
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}
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// validateValue - checks if value is valid or not.
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func (t Tag) validateValue() error {
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// cannot be longer than maxTagValueLength characters
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if utf8.RuneCountInString(t.Value) > maxTagValueLength {
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return ErrInvalidTagValue
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}
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// Tag value shouldn't have "&"
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if strings.Contains(t.Value, "&") {
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return ErrInvalidTagValue
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}
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return nil
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}
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// IsEmpty - checks if tag is empty or not
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func (t Tag) IsEmpty() bool {
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return t.Key == "" && t.Value == ""
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}
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// String - returns a string in format "tag1=value1" for the
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// current Tag
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func (t Tag) String() string {
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return t.Key + "=" + t.Value
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}
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