78 lines
1.9 KiB
Go
78 lines
1.9 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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)
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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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// stringSet is a useful type for looking up strings.
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type stringSet map[string]struct{}
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func newStringSet(strs ...string) stringSet {
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set := make(stringSet, len(strs))
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for _, str := range strs {
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set[str] = struct{}{}
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}
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return set
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}
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// contains returns whether the given key is in this StringSet.
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func (ss stringSet) contains(key string) bool {
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_, ok := ss[key]
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return ok
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}
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// keys returns a slice of all keys in this stringSet.
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func (ss stringSet) keys() []string {
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keys := make([]string, 0, len(ss))
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for key := range ss {
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keys = append(keys, key)
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}
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return keys
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}
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// actionSet is a special type of stringSet.
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type actionSet stringSet
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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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ss := stringSet(s)
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return ss.contains("*") || ss.contains(action)
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}
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// keys wraps stringSet.keys()
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func (s actionSet) keys() []string {
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return stringSet(s).keys()
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}
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