distribution/registry/api/v2/names.go
Matt Moore 74c32a0a51 Allow hostname components in component names.
Fixes https://github.com/docker/distribution/issues/1062

This relaxes the naming restrictions places on Docker images to permit
valid hostnames according to [RFC-2396](https://www.ietf.org/rfc/rfc2396.txt).

It deviates from the RFC in the following ways:
 1) Allow underscores where we allow hyphens (hostnames don't allow
 underscores, which we must for backwards compatibility).
 2) Leave "top-level" name segments unrestricted (domains require an
 alpha character to begin a top-level domain, e.g. "com").
 3) DO NOT allow a trailing dot, as permitted by FQDNs.

Signed-off-by: Matt Moore <mattmoor@google.com>
2015-10-08 11:29:54 -07:00

96 lines
3.7 KiB
Go

package v2
import (
"fmt"
"regexp"
"strings"
)
// TODO(stevvooe): Move these definitions to the future "reference" package.
// While they are used with v2 definitions, their relevance expands beyond.
const (
// RepositoryNameTotalLengthMax is the maximum total number of characters in
// a repository name
RepositoryNameTotalLengthMax = 255
)
// domainLabelRegexp represents the following RFC-2396 BNF construct:
// domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
var domainLabelRegexp = regexp.MustCompile(`[a-z0-9](?:-*[a-z0-9])*`)
// RepositoryNameComponentRegexp restricts registry path component names to
// the allow valid hostnames according to: https://www.ietf.org/rfc/rfc2396.txt
// with the following differences:
// 1) It DOES NOT allow for fully-qualified domain names, which include a
// trailing '.', e.g. "google.com."
// 2) It DOES NOT restrict 'top-level' domain labels to start with just alpha
// characters.
// 3) It DOES allow for underscores to appear in the same situations as dots.
//
// RFC-2396 uses the BNF construct:
// hostname = *( domainlabel "." ) toplabel [ "." ]
var RepositoryNameComponentRegexp = regexp.MustCompile(
domainLabelRegexp.String() + `(?:[._]` + domainLabelRegexp.String() + `)*`)
// RepositoryNameComponentAnchoredRegexp is the version of
// RepositoryNameComponentRegexp which must completely match the content
var RepositoryNameComponentAnchoredRegexp = regexp.MustCompile(`^` + RepositoryNameComponentRegexp.String() + `$`)
// RepositoryNameRegexp builds on RepositoryNameComponentRegexp to allow
// multiple path components, separated by a forward slash.
var RepositoryNameRegexp = regexp.MustCompile(`(?:` + RepositoryNameComponentRegexp.String() + `/)*` + RepositoryNameComponentRegexp.String())
// TagNameRegexp matches valid tag names. From docker/docker:graph/tags.go.
var TagNameRegexp = regexp.MustCompile(`[\w][\w.-]{0,127}`)
// TagNameAnchoredRegexp matches valid tag names, anchored at the start and
// end of the matched string.
var TagNameAnchoredRegexp = regexp.MustCompile("^" + TagNameRegexp.String() + "$")
var (
// ErrRepositoryNameEmpty is returned for empty, invalid repository names.
ErrRepositoryNameEmpty = fmt.Errorf("repository name must have at least one component")
// ErrRepositoryNameLong is returned when a repository name is longer than
// RepositoryNameTotalLengthMax
ErrRepositoryNameLong = fmt.Errorf("repository name must not be more than %v characters", RepositoryNameTotalLengthMax)
// ErrRepositoryNameComponentInvalid is returned when a repository name does
// not match RepositoryNameComponentRegexp
ErrRepositoryNameComponentInvalid = fmt.Errorf("repository name component must match %q", RepositoryNameComponentRegexp.String())
)
// ValidateRepositoryName ensures the repository name is valid for use in the
// registry. This function accepts a superset of what might be accepted by
// docker core or docker hub. If the name does not pass validation, an error,
// describing the conditions, is returned.
//
// Effectively, the name should comply with the following grammar:
//
// alpha-numeric := /[a-z0-9]+/
// separator := /[._-]/
// component := alpha-numeric [separator alpha-numeric]*
// namespace := component ['/' component]*
//
// The result of the production, known as the "namespace", should be limited
// to 255 characters.
func ValidateRepositoryName(name string) error {
if name == "" {
return ErrRepositoryNameEmpty
}
if len(name) > RepositoryNameTotalLengthMax {
return ErrRepositoryNameLong
}
components := strings.Split(name, "/")
for _, component := range components {
if !RepositoryNameComponentAnchoredRegexp.MatchString(component) {
return ErrRepositoryNameComponentInvalid
}
}
return nil
}