distribution/auth/token/util.go

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package token
import (
"encoding/base64"
"errors"
"strings"
"github.com/docker/distribution/common"
)
// joseBase64UrlEncode encodes the given data using the standard base64 url
// encoding format but with all trailing '=' characters ommitted in accordance
// with the jose specification.
// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
func joseBase64UrlEncode(b []byte) string {
return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
}
// joseBase64UrlDecode decodes the given string using the standard base64 url
// decoder but first adds the appropriate number of trailing '=' characters in
// accordance with the jose specification.
// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
func joseBase64UrlDecode(s string) ([]byte, error) {
switch len(s) % 4 {
case 0:
case 2:
s += "=="
case 3:
s += "="
default:
return nil, errors.New("illegal base64url string")
}
return base64.URLEncoding.DecodeString(s)
}
// actionSet is a special type of stringSet.
type actionSet struct {
common.StringSet
}
func newActionSet(actions ...string) actionSet {
return actionSet{common.NewStringSet(actions...)}
}
// Contains calls StringSet.Contains() for
// either "*" or the given action string.
func (s actionSet) Contains(action string) bool {
return s.StringSet.Contains("*") || s.StringSet.Contains(action)
}