From 6ac16e3b5cbfaeb260678ec53e1e052a50b01232 Mon Sep 17 00:00:00 2001
From: Matt Silverlock <matt@eatsleeprepeat.net>
Date: Mon, 28 Mar 2016 22:20:53 -0700
Subject: [feature] NopEncoder: accept/return []byte.

- [docs] Update doc.go for golint.
---
 securecookie.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'securecookie.go')

diff --git a/securecookie.go b/securecookie.go
index be43e9d..83dd606 100644
--- a/securecookie.go
+++ b/securecookie.go
@@ -101,6 +101,7 @@ var (
 	errTimestampTooNew      = cookieError{typ: decodeError, msg: "timestamp is too new"}
 	errTimestampExpired     = cookieError{typ: decodeError, msg: "expired timestamp"}
 	errDecryptionFailed     = cookieError{typ: decodeError, msg: "the value could not be decrypted"}
+	errValueNotByte         = cookieError{typ: decodeError, msg: "value not a []byte."}
 
 	// ErrMacInvalid indicates that cookie decoding failed because the HMAC
 	// could not be extracted and verified.  Direct use of this error
@@ -181,6 +182,11 @@ type GobEncoder struct{}
 // json.Unmarshaller interfaces.
 type JSONEncoder struct{}
 
+// NopEncoder does not encode cookie values, and instead simply accepts a []byte
+// (as an interface{}) and returns a []byte. This is particularly useful when
+// you encoding an object upstream and do not wish to re-encode it.
+type NopEncoder struct{}
+
 // MaxLength restricts the maximum length, in bytes, for the cookie value.
 //
 // Default is 4096, which is the maximum value accepted by Internet Explorer.
@@ -457,6 +463,25 @@ func (e JSONEncoder) Deserialize(src []byte, dst interface{}) error {
 	return nil
 }
 
+// Serialize passes a []byte through as-is.
+func (e NopEncoder) Serialize(src interface{}) ([]byte, error) {
+	if b, ok := src.([]byte); ok {
+		return b, nil
+	}
+
+	return nil, errValueNotByte
+}
+
+// Deserialize passes a []byte through as-is.
+func (e NopEncoder) Deserialize(src []byte, dst interface{}) error {
+	if _, ok := dst.([]byte); ok {
+		dst = src
+		return nil
+	}
+
+	return errValueNotByte
+}
+
 // Encoding -------------------------------------------------------------------
 
 // encode encodes a value using base64.
-- 
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