Web UIs: add OpenID Connect support

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

httpd/flash_test.go

@@ -0,0 +1,26 @@
+package httpd
+
+import (
+	"encoding/base64"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFlashMessages(t *testing.T) {
+	rr := httptest.NewRecorder()
+	req, err := http.NewRequest(http.MethodGet, "/url", nil)
+	require.NoError(t, err)
+	message := "test message"
+	setFlashMessage(rr, req, message)
+	req.Header.Set("Cookie", fmt.Sprintf("%v=%v", flashCookieName, base64.URLEncoding.EncodeToString([]byte(message))))
+	msg := getFlashMessage(rr, req)
+	assert.Equal(t, message, msg)
+	req.Header.Set("Cookie", fmt.Sprintf("%v=%v", flashCookieName, "a"))
+	msg = getFlashMessage(rr, req)
+	assert.Empty(t, msg)
+}