Add @ prefix for sender username in push notifications (#11934)

* Add @ prefix for sender username in push notifications

* de-duplicating code

app/notification.go

@@ -640,7 +640,7 @@ type postNotification struct {
 func (n *postNotification) GetChannelName(userNameFormat string, excludeId string) string {
 	switch n.channel.Type {
 	case model.CHANNEL_DIRECT:
-		return n.sender.GetDisplayName(userNameFormat)
+		return n.sender.GetDisplayNameWithPrefix(userNameFormat, "@")
 	case model.CHANNEL_GROUP:
 		names := []string{}
 		for _, user := range n.profileMap {
@@ -670,7 +670,7 @@ func (n *postNotification) GetSenderName(userNameFormat string, overridesAllowed
 		}
 	}
 
-	return n.sender.GetDisplayName(userNameFormat)
+	return n.sender.GetDisplayNameWithPrefix(userNameFormat, "@")
 }
 
 // addMentionedUsers will add the mentioned user id in the struct's list for mentioned users

app/notification_test.go

@@ -1207,12 +1207,12 @@ func TestPostNotificationGetChannelName(t *testing.T) {
 		},
 		"direct channel, unspecified": {
 			channel:  &model.Channel{Type: model.CHANNEL_DIRECT},
-			expected: "sender",
+			expected: "@sender",
 		},
 		"direct channel, username": {
 			channel:    &model.Channel{Type: model.CHANNEL_DIRECT},
 			nameFormat: model.SHOW_USERNAME,
-			expected:   "sender",
+			expected:   "@sender",
 		},
 		"direct channel, full name": {
 			channel:    &model.Channel{Type: model.CHANNEL_DIRECT},
@@ -1290,11 +1290,11 @@ func TestPostNotificationGetSenderName(t *testing.T) {
 		expected       string
 	}{
 		"name format unspecified": {
-			expected: sender.Username,
+			expected: "@" + sender.Username,
 		},
 		"name format username": {
 			nameFormat: model.SHOW_USERNAME,
-			expected:   sender.Username,
+			expected:   "@" + sender.Username,
 		},
 		"name format full name": {
 			nameFormat: model.SHOW_FULLNAME,
@@ -1317,12 +1317,12 @@ func TestPostNotificationGetSenderName(t *testing.T) {
 			channel:        &model.Channel{Type: model.CHANNEL_DIRECT},
 			post:           overriddenPost,
 			allowOverrides: true,
-			expected:       sender.Username,
+			expected:       "@" + sender.Username,
 		},
 		"overridden username, overrides disabled": {
 			post:           overriddenPost,
 			allowOverrides: false,
-			expected:       sender.Username,
+			expected:       "@" + sender.Username,
 		},
 	} {
 		t.Run(name, func(t *testing.T) {