From ff54fb7647557a0cb01336782749f1da2ed1eaf6 Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Wed, 27 Oct 2021 13:00:18 +0300
Subject: [PATCH] [#53] session: move XHeader from neofs-api-go

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
---
 session/xheader.go      | 55 ++++++++++++++++++++++++++++++++++++++
 session/xheader_test.go | 58 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 113 insertions(+)
 create mode 100644 session/xheader.go
 create mode 100644 session/xheader_test.go

diff --git a/session/xheader.go b/session/xheader.go
new file mode 100644
index 0000000..9705941
--- /dev/null
+++ b/session/xheader.go
@@ -0,0 +1,55 @@
+package session
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/session"
+)
+
+// XHeader represents v2-compatible XHeader.
+type XHeader session.XHeader
+
+// NewXHeaderFromV2 wraps v2 XHeader message to XHeader.
+//
+// Nil session.XHeader converts to nil.
+func NewXHeaderFromV2(v *session.XHeader) *XHeader {
+	return (*XHeader)(v)
+}
+
+// NewXHeader creates, initializes and returns blank XHeader instance.
+//
+// Defaults:
+//  - key: "";
+//  - value: "".
+func NewXHeader() *XHeader {
+	return NewXHeaderFromV2(new(session.XHeader))
+}
+
+// ToV2 converts XHeader to v2 XHeader message.
+//
+// Nil XHeader converts to nil.
+func (x *XHeader) ToV2() *session.XHeader {
+	return (*session.XHeader)(x)
+}
+
+// Key returns key to X-Header.
+func (x *XHeader) Key() string {
+	return (*session.XHeader)(x).
+		GetKey()
+}
+
+// SetKey sets key to X-Header.
+func (x *XHeader) SetKey(k string) {
+	(*session.XHeader)(x).
+		SetKey(k)
+}
+
+// Value returns value of X-Header.
+func (x *XHeader) Value() string {
+	return (*session.XHeader)(x).
+		GetValue()
+}
+
+// SetValue sets value of X-Header.
+func (x *XHeader) SetValue(k string) {
+	(*session.XHeader)(x).
+		SetValue(k)
+}
diff --git a/session/xheader_test.go b/session/xheader_test.go
new file mode 100644
index 0000000..28fe7a3
--- /dev/null
+++ b/session/xheader_test.go
@@ -0,0 +1,58 @@
+package session
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/session"
+	"github.com/stretchr/testify/require"
+)
+
+func TestXHeader(t *testing.T) {
+	x := NewXHeader()
+
+	key := "some key"
+	val := "some value"
+
+	x.SetKey(key)
+	x.SetValue(val)
+
+	require.Equal(t, key, x.Key())
+	require.Equal(t, val, x.Value())
+
+	xV2 := x.ToV2()
+
+	require.Equal(t, key, xV2.GetKey())
+	require.Equal(t, val, xV2.GetValue())
+}
+
+func TestNewXHeaderFromV2(t *testing.T) {
+	t.Run("from nil", func(t *testing.T) {
+		var x *session.XHeader
+
+		require.Nil(t, NewXHeaderFromV2(x))
+	})
+}
+
+func TestXHeader_ToV2(t *testing.T) {
+	t.Run("nil", func(t *testing.T) {
+		var x *XHeader
+
+		require.Nil(t, x.ToV2())
+	})
+}
+
+func TestNewXHeader(t *testing.T) {
+	t.Run("default values", func(t *testing.T) {
+		xh := NewXHeader()
+
+		// check initial values
+		require.Empty(t, xh.Value())
+		require.Empty(t, xh.Key())
+
+		// convert to v2 message
+		xhV2 := xh.ToV2()
+
+		require.Empty(t, xhV2.GetValue())
+		require.Empty(t, xhV2.GetKey())
+	})
+}