125 lines
4.2 KiB
Go
125 lines
4.2 KiB
Go
package storage
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// This is a fork of docker/distribution code to be used when manipulating image
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// references.
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// DO NOT EDIT THIS FILE.
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import "regexp"
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var (
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// alphaNumericRegexp defines the alpha numeric atom, typically a
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// component of names. This only allows lower case characters and digits.
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alphaNumericRegexp = match(`[a-z0-9]+`)
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// separatorRegexp defines the separators allowed to be embedded in name
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// components. This allow one period, one or two underscore and multiple
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// dashes.
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separatorRegexp = match(`(?:[._]|__|[-]*)`)
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// nameComponentRegexp restricts registry path component names to start
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// with at least one letter or number, with following parts able to be
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// separated by one period, one or two underscore and multiple dashes.
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nameComponentRegexp = expression(
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alphaNumericRegexp,
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optional(repeated(separatorRegexp, alphaNumericRegexp)))
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// domainComponentRegexp restricts the registry domain component of a
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// repository name to start with a component as defined by domainRegexp
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// and followed by an optional port.
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domainComponentRegexp = match(`(?:[a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])`)
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// domainRegexp defines the structure of potential domain components
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// that may be part of image names. This is purposely a subset of what is
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// allowed by DNS to ensure backwards compatibility with Docker image
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// names.
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domainRegexp = expression(
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domainComponentRegexp,
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optional(repeated(literal(`.`), domainComponentRegexp)),
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optional(literal(`:`), match(`[0-9]+`)))
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// NameRegexp is the format for the name component of references. The
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// regexp has capturing groups for the domain and name part omitting
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// the separating forward slash from either.
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NameRegexp = expression(
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optional(domainRegexp, literal(`/`)),
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nameComponentRegexp,
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optional(repeated(literal(`/`), nameComponentRegexp)))
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// anchoredNameRegexp is used to parse a name value, capturing the
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// domain and trailing components.
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anchoredNameRegexp = anchored(
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optional(capture(domainRegexp), literal(`/`)),
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capture(nameComponentRegexp,
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optional(repeated(literal(`/`), nameComponentRegexp))))
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// IdentifierRegexp is the format for string identifier used as a
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// content addressable identifier using sha256. These identifiers
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// are like digests without the algorithm, since sha256 is used.
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IdentifierRegexp = match(`([a-f0-9]{64})`)
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// ShortIdentifierRegexp is the format used to represent a prefix
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// of an identifier. A prefix may be used to match a sha256 identifier
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// within a list of trusted identifiers.
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ShortIdentifierRegexp = match(`([a-f0-9]{6,64})`)
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)
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// match compiles the string to a regular expression.
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var match = regexp.MustCompile
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// literal compiles s into a literal regular expression, escaping any regexp
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// reserved characters.
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func literal(s string) *regexp.Regexp {
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re := match(regexp.QuoteMeta(s))
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if _, complete := re.LiteralPrefix(); !complete {
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panic("must be a literal")
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}
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return re
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}
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func splitDomain(name string) (string, string) {
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match := anchoredNameRegexp.FindStringSubmatch(name)
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if len(match) != 3 {
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return "", name
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}
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return match[1], match[2]
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}
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// expression defines a full expression, where each regular expression must
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// follow the previous.
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func expression(res ...*regexp.Regexp) *regexp.Regexp {
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var s string
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for _, re := range res {
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s += re.String()
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}
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return match(s)
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}
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// optional wraps the expression in a non-capturing group and makes the
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// production optional.
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func optional(res ...*regexp.Regexp) *regexp.Regexp {
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return match(group(expression(res...)).String() + `?`)
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}
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// repeated wraps the regexp in a non-capturing group to get one or more
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// matches.
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func repeated(res ...*regexp.Regexp) *regexp.Regexp {
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return match(group(expression(res...)).String() + `+`)
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}
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// group wraps the regexp in a non-capturing group.
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func group(res ...*regexp.Regexp) *regexp.Regexp {
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return match(`(?:` + expression(res...).String() + `)`)
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}
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// capture wraps the expression in a capturing group.
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func capture(res ...*regexp.Regexp) *regexp.Regexp {
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return match(`(` + expression(res...).String() + `)`)
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}
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// anchored anchors the regular expression by adding start and end delimiters.
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func anchored(res ...*regexp.Regexp) *regexp.Regexp {
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return match(`^` + expression(res...).String() + `$`)
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}
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