feat(protocol): ignore padding for base64 url encoding

This adds support to ignore the trailing padding of base64 URL encoded bytes.
go-webauthn · Jan 24, 2023 · fa6fedb · fa6fedb
1 parent c2e06ed
commit fa6fedb
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/protocol/base64.go b/protocol/base64.go
@@ -22,8 +22,13 @@ func (e *URLEncodedBase64) UnmarshalJSON(data []byte) error {
  return nil
  }
 
+ // TODO: Investigate this line. It is commented as trimming the leading spaces but appears to trim the leading and trailing double quotes instead.
  // Trim the leading spaces
  data = bytes.Trim(data, "\"")
+
+ // Trim the trailing equal characters.
+ data = bytes.TrimSuffix(data, []byte{0x3d})
+
  out := make([]byte, base64.RawURLEncoding.DecodedLen(len(data)))
  n, err := base64.RawURLEncoding.Decode(out, data)
  if err != nil {