fixed #147 support zero value of badge.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

gorush/notification.go

@@ -76,7 +76,7 @@ type PushNotification struct {
 	Expiration int64    `json:"expiration,omitempty"`
 	ApnsID     string   `json:"apns_id,omitempty"`
 	Topic      string   `json:"topic,omitempty"`
-	Badge      int      `json:"badge,omitempty"`
+	Badge      *int     `json:"badge,omitempty"`
 	Category   string   `json:"category,omitempty"`
 	URLArgs    []string `json:"url-args,omitempty"`
 	Alert      Alert    `json:"alert,omitempty"`
@@ -305,8 +305,8 @@ func GetIOSNotification(req PushNotification) *apns.Notification {
 	payload := payload.NewPayload().Alert(req.Message)
 
 	// zero value for clear the badge on the app icon.
-	if req.Badge >= 0 {
+	if req.Badge != nil && *req.Badge >= 0 {
-		payload.Badge(req.Badge)
+		payload.Badge(*req.Badge)
 	}
 
 	if len(req.Sound) > 0 {

gorush/notification_test.go

@@ -65,6 +65,7 @@ func TestIOSNotificationStructure(t *testing.T) {
 	var unix = time.Now().Unix()
 
 	test := "test"
+	expectBadge := 0
 	message := "Welcome notification Server"
 	req := PushNotification{
 		ApnsID:           test,
@@ -72,7 +73,7 @@ func TestIOSNotificationStructure(t *testing.T) {
 		Expiration:       time.Now().Unix(),
 		Priority:         "normal",
 		Message:          message,
-		Badge:            0,
+		Badge:            &expectBadge,
 		Sound:            test,
 		ContentAvailable: true,
 		Data: D{
@@ -108,7 +109,8 @@ func TestIOSNotificationStructure(t *testing.T) {
 	assert.Equal(t, unix, notification.Expiration.Unix())
 	assert.Equal(t, ApnsPriorityLow, notification.Priority)
 	assert.Equal(t, message, alert)
-	assert.Equal(t, 0, int(badge))
+	assert.Equal(t, expectBadge, int(badge))
+	assert.Equal(t, expectBadge, *req.Badge)
 	assert.Equal(t, test, sound)
 	assert.Equal(t, 1, int(contentAvailable))
 	assert.Equal(t, "test", key1)
@@ -118,6 +120,72 @@ func TestIOSNotificationStructure(t *testing.T) {
 	assert.Contains(t, urlArgs, "b")
 }
 
+// Silent Notification which payload’s aps dictionary must not contain the alert, sound, or badge keys.
+// ref: https://goo.gl/m9xyqG
+func TestSendZeroValueForBadgeKey(t *testing.T) {
+	var dat map[string]interface{}
+
+	test := "test"
+	message := "Welcome notification Server"
+	req := PushNotification{
+		ApnsID:           test,
+		Topic:            test,
+		Priority:         "normal",
+		Message:          message,
+		Sound:            test,
+		ContentAvailable: true,
+	}
+
+	notification := GetIOSNotification(req)
+
+	dump, _ := json.Marshal(notification.Payload)
+	data := []byte(string(dump))
+
+	if err := json.Unmarshal(data, &dat); err != nil {
+		log.Println(err)
+		panic(err)
+	}
+
+	alert, _ := jsonparser.GetString(data, "aps", "alert")
+	badge, _ := jsonparser.GetInt(data, "aps", "badge")
+	sound, _ := jsonparser.GetString(data, "aps", "sound")
+	contentAvailable, _ := jsonparser.GetInt(data, "aps", "content-available")
+
+	if req.Badge != nil {
+		t.Errorf("req.Badge must be nil")
+	}
+
+	assert.Equal(t, test, notification.ApnsID)
+	assert.Equal(t, test, notification.Topic)
+	assert.Equal(t, ApnsPriorityLow, notification.Priority)
+	assert.Equal(t, message, alert)
+	assert.Equal(t, 0, int(badge))
+	assert.Equal(t, test, sound)
+	assert.Equal(t, 1, int(contentAvailable))
+
+	// Add Bage
+	expectBadge := 10
+	req.Badge = &expectBadge
+
+	notification = GetIOSNotification(req)
+
+	dump, _ = json.Marshal(notification.Payload)
+	data = []byte(string(dump))
+
+	if err := json.Unmarshal(data, &dat); err != nil {
+		log.Println(err)
+		panic(err)
+	}
+
+	if req.Badge == nil {
+		t.Errorf("req.Badge must be equal %d", *req.Badge)
+	}
+
+	badge, _ = jsonparser.GetInt(data, "aps", "badge")
+	assert.Equal(t, expectBadge, *req.Badge)
+	assert.Equal(t, expectBadge, int(badge))
+}
+
 func TestIOSAlertNotificationStructure(t *testing.T) {
 	var dat map[string]interface{}