forked from TrueCloudLab/distribution
39 lines
983 B
Go
39 lines
983 B
Go
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package reference
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import (
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"fmt"
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"regexp"
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)
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var (
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// TagRegexp matches valid tag names. From docker/docker:graph/tags.go.
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TagRegexp = regexp.MustCompile(`[\w][\w.-]{0,127}`)
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// TagAnchoredRegexp matches valid tag names, anchored at the start and
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// end of the matched string.
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TagAnchoredRegexp = regexp.MustCompile(`^` + TagRegexp.String() + `$`)
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// ErrTagInvalid is returned when a tag does not match TagAnchoredRegexp.
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ErrTagInvalid = fmt.Errorf("tag name must match %q", TagRegexp.String())
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)
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// Tag represents an image's tag name.
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type Tag string
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// NewTag returns a valid Tag from an input string s.
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// If the validation fails, an error is returned.
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func NewTag(s string) (Tag, error) {
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tag := Tag(s)
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return tag, tag.Validate()
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}
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// Validate returns ErrTagInvalid if tag does not match TagAnchoredRegexp.
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//
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// tag := [\w][\w.-]{0,127}
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func (tag Tag) Validate() error {
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if !TagAnchoredRegexp.MatchString(string(tag)) {
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return ErrTagInvalid
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}
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return nil
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}
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