Add support for confidential GitLab issues

gitlab/gitlab.go

@@ -29,6 +29,7 @@ const (
 	PushEvents               Event = "Push Hook"
 	TagEvents                Event = "Tag Push Hook"
 	IssuesEvents             Event = "Issue Hook"
+	ConfidentialIssuesEvents Event = "Confidential Issue Hook"
 	CommentEvents            Event = "Note Hook"
 	MergeRequestEvents       Event = "Merge Request Hook"
 	WikiPageEvents           Event = "Wiki Page Hook"
@@ -112,6 +113,9 @@ func (hook Webhook) ParsePayload(w http.ResponseWriter, r *http.Request) {
 		json.Unmarshal([]byte(payload), &te)
 		hook.runProcessPayloadFunc(fn, te, hd)
 
+	case ConfidentialIssuesEvents:
+		// Confidential issues have the same payload as normal issues.
+		fallthrough
 	case IssuesEvents:
 		var ie IssueEventPayload
 		json.Unmarshal([]byte(payload), &ie)