forked from TrueCloudLab/distribution
6bd5b8c24e
In order to support valid hostnames as name components, supporting repeated dash was added. Additionally double underscore is now allowed as a separator to loosen the restriction for previously supported names. Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
42 lines
2.3 KiB
Go
42 lines
2.3 KiB
Go
package reference
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import "regexp"
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var (
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// nameSubComponentRegexp defines the part of the name which must be
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// begin and end with an alphanumeric character. These characters can
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// be separated by any number of dashes.
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nameSubComponentRegexp = regexp.MustCompile(`[a-z0-9]+(?:[-]+[a-z0-9]+)*`)
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// nameComponentRegexp 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, underscore or double underscore.
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nameComponentRegexp = regexp.MustCompile(nameSubComponentRegexp.String() + `(?:(?:[._]|__)` + nameSubComponentRegexp.String() + `)*`)
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nameRegexp = regexp.MustCompile(`(?:` + nameComponentRegexp.String() + `/)*` + nameComponentRegexp.String())
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hostnameComponentRegexp = regexp.MustCompile(`(?:[a-z0-9]|[a-z0-9][a-z0-9-]*[a-z0-9])`)
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// hostnameComponentRegexp restricts the registry hostname component of a repository name to
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// start with a component as defined by hostnameRegexp and followed by an optional port.
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hostnameRegexp = regexp.MustCompile(`(?:` + hostnameComponentRegexp.String() + `\.)*` + hostnameComponentRegexp.String() + `(?::[0-9]+)?`)
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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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// anchoredTagRegexp matches valid tag names, anchored at the start and
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// end of the matched string.
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anchoredTagRegexp = regexp.MustCompile(`^` + TagRegexp.String() + `$`)
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// NameRegexp is the format for the name component of references. The
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// regexp has capturing groups for the hostname and name part omitting
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// the seperating forward slash from either.
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NameRegexp = regexp.MustCompile(`(?:` + hostnameRegexp.String() + `/)?` + nameRegexp.String())
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// ReferenceRegexp is the full supported format of a reference. The
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// regexp has capturing groups for name, tag, and digest components.
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ReferenceRegexp = regexp.MustCompile(`^((?:` + hostnameRegexp.String() + `/)?` + nameRegexp.String() + `)(?:[:](` + TagRegexp.String() + `))?(?:[@]([A-Za-z][A-Za-z0-9]*(?:[-_+.][A-Za-z][A-Za-z0-9]*)*[:][[:xdigit:]]{32,}))?$`)
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// anchoredNameRegexp is used to parse a name value, capturing hostname
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anchoredNameRegexp = regexp.MustCompile(`^(?:(` + hostnameRegexp.String() + `)/)?(` + nameRegexp.String() + `)$`)
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)
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