Add CollapseID for ios notification. (#308)

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

gorush/notification.go

@@ -76,6 +76,7 @@ type PushNotification struct {
 	// iOS
 	Expiration     int64    `json:"expiration,omitempty"`
 	ApnsID         string   `json:"apns_id,omitempty"`
+	CollapseID     string   `json:"collapse_id,omitempty"`
 	Topic          string   `json:"topic,omitempty"`
 	Badge          *int     `json:"badge,omitempty"`
 	Category       string   `json:"category,omitempty"`

gorush/notification_apns.go

@@ -125,8 +125,9 @@ func iosAlertDictionary(payload *payload.Payload, req PushNotification) *payload
 // ref: https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/PayloadKeyReference.html#//apple_ref/doc/uid/TP40008194-CH17-SW1
 func GetIOSNotification(req PushNotification) *apns2.Notification {
 	notification := &apns2.Notification{
-		ApnsID: req.ApnsID,
-		Topic:  req.Topic,
+		ApnsID:     req.ApnsID,
+		Topic:      req.Topic,
+		CollapseID: req.CollapseID,
 	}
 
 	if req.Expiration > 0 {

gorush/notification_apns_test.go

@@ -180,6 +180,7 @@ func TestCheckSilentNotification(t *testing.T) {
 	req := PushNotification{
 		ApnsID:           test,
 		Topic:            test,
+		CollapseID:       test,
 		Priority:         "normal",
 		ContentAvailable: true,
 	}
@@ -194,6 +195,9 @@ func TestCheckSilentNotification(t *testing.T) {
 		panic(err)
 	}
 
+	assert.Equal(t, test, notification.CollapseID)
+	assert.Equal(t, test, notification.ApnsID)
+	assert.Equal(t, test, notification.Topic)
 	assert.Nil(t, dat["aps"].(map[string]interface{})["alert"])
 	assert.Nil(t, dat["aps"].(map[string]interface{})["sound"])
 	assert.Nil(t, dat["aps"].(map[string]interface{})["badge"])