forked from TrueCloudLab/distribution
100 lines
3.9 KiB
Go
100 lines
3.9 KiB
Go
package v2
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import (
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"fmt"
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"regexp"
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"strings"
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)
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// TODO(stevvooe): Move these definitions back to an exported package. While
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// they are used with v2 definitions, their relevance expands beyond.
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// "distribution/names" is a candidate package.
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const (
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// RepositoryNameComponentMinLength is the minimum number of characters in a
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// single repository name slash-delimited component
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RepositoryNameComponentMinLength = 2
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// RepositoryNameMinComponents is the minimum number of slash-delimited
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// components that a repository name must have
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RepositoryNameMinComponents = 1
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// RepositoryNameTotalLengthMax is the maximum total number of characters in
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// a repository name
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RepositoryNameTotalLengthMax = 255
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)
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// RepositoryNameComponentRegexp restricts registry path component names to
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// start with at least one letter or number, with following parts able to
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// be separated by one period, dash or underscore.
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var RepositoryNameComponentRegexp = regexp.MustCompile(`[a-z0-9]+(?:[._-][a-z0-9]+)*`)
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// RepositoryNameComponentAnchoredRegexp is the version of
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// RepositoryNameComponentRegexp which must completely match the content
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var RepositoryNameComponentAnchoredRegexp = regexp.MustCompile(`^` + RepositoryNameComponentRegexp.String() + `$`)
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// RepositoryNameRegexp builds on RepositoryNameComponentRegexp to allow
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// multiple path components, separated by a forward slash.
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var RepositoryNameRegexp = regexp.MustCompile(`(?:` + RepositoryNameComponentRegexp.String() + `/)*` + RepositoryNameComponentRegexp.String())
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// TagNameRegexp matches valid tag names. From docker/docker:graph/tags.go.
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var TagNameRegexp = regexp.MustCompile(`[\w][\w.-]{0,127}`)
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// TODO(stevvooe): Contribute these exports back to core, so they are shared.
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var (
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// ErrRepositoryNameComponentShort is returned when a repository name
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// contains a component which is shorter than
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// RepositoryNameComponentMinLength
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ErrRepositoryNameComponentShort = fmt.Errorf("respository name component must be %v or more characters", RepositoryNameComponentMinLength)
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// ErrRepositoryNameMissingComponents is returned when a repository name
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// contains fewer than RepositoryNameMinComponents components
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ErrRepositoryNameMissingComponents = fmt.Errorf("repository name must have at least %v components", RepositoryNameMinComponents)
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// ErrRepositoryNameLong is returned when a repository name is longer than
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// RepositoryNameTotalLengthMax
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ErrRepositoryNameLong = fmt.Errorf("repository name must not be more than %v characters", RepositoryNameTotalLengthMax)
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// ErrRepositoryNameComponentInvalid is returned when a repository name does
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// not match RepositoryNameComponentRegexp
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ErrRepositoryNameComponentInvalid = fmt.Errorf("repository name component must match %q", RepositoryNameComponentRegexp.String())
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)
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// ValidateRespositoryName ensures the repository name is valid for use in the
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// registry. This function accepts a superset of what might be accepted by
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// docker core or docker hub. If the name does not pass validation, an error,
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// describing the conditions, is returned.
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//
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// Effectively, the name should comply with the following grammar:
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//
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// alpha-numeric := /[a-z0-9]+/
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// separator := /[._-]/
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// component := alpha-numeric [separator alpha-numeric]*
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// namespace := component ['/' component]*
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//
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// The result of the production, known as the "namespace", should be limited
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// to 255 characters.
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func ValidateRespositoryName(name string) error {
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if len(name) > RepositoryNameTotalLengthMax {
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return ErrRepositoryNameLong
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}
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components := strings.Split(name, "/")
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if len(components) < RepositoryNameMinComponents {
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return ErrRepositoryNameMissingComponents
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}
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for _, component := range components {
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if len(component) < RepositoryNameComponentMinLength {
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return ErrRepositoryNameComponentShort
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}
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if !RepositoryNameComponentAnchoredRegexp.MatchString(component) {
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return ErrRepositoryNameComponentInvalid
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}
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}
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return nil
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}
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