backend/banners: fetch banners from staging when app is in dev mode

Previously the app was always fetching banners from the production
server. Now when built in dev mode it fetches them from staging, which
allows to test new banners before releasing them in production.

Author: Beerosagos

backend/backend.go

@@ -293,7 +293,7 @@ func NewBackend(arguments *arguments.Arguments, environment Environment) (*Backe
 	backend.ratesUpdater = rates.NewRateUpdater(hclient, ratesCache)
 	backend.ratesUpdater.Observe(backend.Notify)
 
-	backend.banners = banners.NewBanners()
+	backend.banners = banners.NewBanners(backend.DevServers())
 	backend.banners.Observe(backend.Notify)
 
 	backend.bluetooth = bluetooth.New(log)

backend/banners/banners.go

@@ -26,7 +26,11 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-const bannersURL = "https://bitboxapp.shiftcrypto.io/banners.json"
+const (
+	bannersDevURL = "https://bitboxapp.shiftcrypto.dev/banners.json"
+
+	bannersProdURL = "https://bitboxapp.shiftcrypto.io/banners.json"
+)
 
 // MessageKey enumerates the possible keys in the banners json.
 type MessageKey string
@@ -84,9 +88,13 @@ type Banners struct {
 }
 
 // NewBanners makes a new Banners instance.
-func NewBanners() *Banners {
+func NewBanners(devServers bool) *Banners {
+	url := bannersProdURL
+	if devServers {
+		url = bannersDevURL
+	}
 	return &Banners{
-		url:    bannersURL,
+		url:    url,
 		active: map[MessageKey]struct{}{},
 		log:    logging.Get().WithGroup("banners"),
 	}

backend/banners/banners_test.go

@@ -45,7 +45,7 @@ func TestInit(t *testing.T) {
 	server := httptest.NewServer(handler)
 	defer server.Close()
 
-	banners := NewBanners()
+	banners := NewBanners(true)
 	banners.url = server.URL
 	banners.Init(server.Client())
 	require.Nil(t, banners.GetMessage(KeyBitBox01))