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// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 name
import (
"strings"
)
const (
// TODO(dekkagaijin): use the docker/distribution regexes for validation.
tagChars = "abcdefghijklmnopqrstuvwxyz0123456789_-.ABCDEFGHIJKLMNOPQRSTUVWXYZ"
tagDelim = ":"
)
// Tag stores a docker tag name in a structured form.
type Tag struct {
Repository
tag string
original string
}
// Ensure Tag implements Reference
var _ Reference = (*Tag)(nil)
// Context implements Reference.
func (t Tag) Context() Repository {
return t.Repository
}
// Identifier implements Reference.
func (t Tag) Identifier() string {
return t.TagStr()
}
// TagStr returns the tag component of the Tag.
func (t Tag) TagStr() string {
return t.tag
}
// Name returns the name from which the Tag was derived.
func (t Tag) Name() string {
return t.Repository.Name() + tagDelim + t.TagStr()
}
// String returns the original input string.
func (t Tag) String() string {
return t.original
}
// Scope returns the scope required to perform the given action on the tag.
func (t Tag) Scope(action string) string {
return t.Repository.Scope(action)
}
func checkTag(name string) error {
return checkElement("tag", name, tagChars, 1, 128)
}
// NewTag returns a new Tag representing the given name, according to the given strictness.
func NewTag(name string, opts ...Option) (Tag, error) {
opt := makeOptions(opts...)
base := name
tag := ""
// Split on ":"
parts := strings.Split(name, tagDelim)
// Verify that we aren't confusing a tag for a hostname w/ port for the purposes of weak validation.
if len(parts) > 1 && !strings.Contains(parts[len(parts)-1], regRepoDelimiter) {
base = strings.Join(parts[:len(parts)-1], tagDelim)
tag = parts[len(parts)-1]
}
// We don't require a tag, but if we get one check it's valid,
// even when not being strict.
// If we are being strict, we want to validate the tag regardless in case
// it's empty.
if tag != "" || opt.strict {
if err := checkTag(tag); err != nil {
return Tag{}, err
}
}
if tag == "" {
tag = opt.defaultTag
}
repo, err := NewRepository(base, opts...)
if err != nil {
return Tag{}, err
}
return Tag{
Repository: repo,
tag: tag,
original: name,
}, nil
}
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