open-consul/vendor/github.com/SermoDigital/jose/base64.go

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2018-06-21 14:49:35 +00:00
package jose
import "encoding/base64"
// Encoder is satisfied if the type can marshal itself into a valid
// structure for a JWS.
type Encoder interface {
// Base64 implies T -> JSON -> RawURLEncodingBase64
Base64() ([]byte, error)
}
// Base64Decode decodes a base64-encoded byte slice.
func Base64Decode(b []byte) ([]byte, error) {
buf := make([]byte, base64.RawURLEncoding.DecodedLen(len(b)))
n, err := base64.RawURLEncoding.Decode(buf, b)
return buf[:n], err
}
// Base64Encode encodes a byte slice.
func Base64Encode(b []byte) []byte {
buf := make([]byte, base64.RawURLEncoding.EncodedLen(len(b)))
base64.RawURLEncoding.Encode(buf, b)
return buf
}
// EncodeEscape base64-encodes a byte slice but escapes it for JSON.
// It'll return the format: `"base64"`
func EncodeEscape(b []byte) []byte {
buf := make([]byte, base64.RawURLEncoding.EncodedLen(len(b))+2)
buf[0] = '"'
base64.RawURLEncoding.Encode(buf[1:], b)
buf[len(buf)-1] = '"'
return buf
}
// DecodeEscaped decodes a base64-encoded byte slice straight from a JSON
// structure. It assumes it's in the format: `"base64"`, but can handle
// cases where it's not.
func DecodeEscaped(b []byte) ([]byte, error) {
if len(b) > 1 && b[0] == '"' && b[len(b)-1] == '"' {
b = b[1 : len(b)-1]
}
return Base64Decode(b)
}