gitea/vendor/github.com/duo-labs/webauthn/protocol/base64.go

42 lines
1.1 KiB
Go

package protocol
import (
"bytes"
"encoding/base64"
"reflect"
)
// URLEncodedBase64 represents a byte slice holding URL-encoded base64 data.
// When fields of this type are unmarshaled from JSON, the data is base64
// decoded into a byte slice.
type URLEncodedBase64 []byte
// UnmarshalJSON base64 decodes a URL-encoded value, storing the result in the
// provided byte slice.
func (dest *URLEncodedBase64) UnmarshalJSON(data []byte) error {
if bytes.Equal(data, []byte("null")) {
return nil
}
// Trim the leading spaces
data = bytes.Trim(data, "\"")
out := make([]byte, base64.RawURLEncoding.DecodedLen(len(data)))
n, err := base64.RawURLEncoding.Decode(out, data)
if err != nil {
return err
}
v := reflect.ValueOf(dest).Elem()
v.SetBytes(out[:n])
return nil
}
// MarshalJSON base64 encodes a non URL-encoded value, storing the result in the
// provided byte slice.
func (data URLEncodedBase64) MarshalJSON() ([]byte, error) {
if data == nil {
return []byte("null"), nil
}
return []byte(`"` + base64.RawURLEncoding.EncodeToString(data) + `"`), nil
}