From d62b42ab97c7d69681cb1751b7e65cfe4bed0cbb Mon Sep 17 00:00:00 2001
From: William Petit <wpetit@cadoles.com>
Date: Thu, 6 Dec 2018 21:42:01 +0100
Subject: [PATCH] Add cookie session store helper

---
 session/gorilla/cookie.go | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 session/gorilla/cookie.go

diff --git a/session/gorilla/cookie.go b/session/gorilla/cookie.go
new file mode 100644
index 0000000..01fde46
--- /dev/null
+++ b/session/gorilla/cookie.go
@@ -0,0 +1,32 @@
+package gorilla
+
+import (
+	"crypto/rand"
+
+	"github.com/gorilla/sessions"
+	"github.com/pkg/errors"
+)
+
+// CreateCookieSessionStore creates and returns a new cookie session store
+// with random authentication and encryption keys
+func CreateCookieSessionStore(authKeySize, encryptKeySize int) (sessions.Store, error) {
+	authenticationKey, err := generateRandomBytes(64)
+	if err != nil {
+		return nil, errors.Wrap(err, "error while generating cookie authentication key")
+	}
+	encryptionKey, err := generateRandomBytes(32)
+	if err != nil {
+		return nil, errors.Wrap(err, "error while generating cookie encryption key")
+	}
+	store := sessions.NewCookieStore(authenticationKey, encryptionKey)
+	return store, nil
+}
+
+func generateRandomBytes(n int) ([]byte, error) {
+	b := make([]byte, n)
+	_, err := rand.Read(b)
+	if err != nil {
+		return nil, err
+	}
+	return b, nil
+}