1266f13afa
As part of the efforts to break up the common package before disaster strikes, a new collections package has been created. More may belong there but for now, it only includes an implementation of StringSet. Signed-off-by: Stephen J Day <stephen.day@docker.com>
50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
package token
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import (
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"encoding/base64"
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"errors"
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"strings"
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"github.com/docker/distribution/collections"
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)
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// joseBase64UrlEncode encodes the given data using the standard base64 url
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// encoding format but with all trailing '=' characters ommitted in accordance
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// with the jose specification.
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// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
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func joseBase64UrlEncode(b []byte) string {
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return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
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}
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// joseBase64UrlDecode decodes the given string using the standard base64 url
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// decoder but first adds the appropriate number of trailing '=' characters in
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// accordance with the jose specification.
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// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
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func joseBase64UrlDecode(s string) ([]byte, error) {
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switch len(s) % 4 {
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case 0:
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case 2:
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s += "=="
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case 3:
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s += "="
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default:
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return nil, errors.New("illegal base64url string")
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}
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return base64.URLEncoding.DecodeString(s)
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}
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// actionSet is a special type of stringSet.
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type actionSet struct {
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collections.StringSet
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}
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func newActionSet(actions ...string) actionSet {
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return actionSet{collections.NewStringSet(actions...)}
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}
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// Contains calls StringSet.Contains() for
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// either "*" or the given action string.
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func (s actionSet) Contains(action string) bool {
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return s.StringSet.Contains("*") || s.StringSet.Contains(action)
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}
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