[MM-493]: Fixed the bug 'don't have the permissions to create subscri…

…ptions for this project (#495)

* [MM-493]: Fixed the bug 'don't have the permissions to create subscriptions for this project'

* [MM-493]: Fixed lint errors

* [MM-493]: Fixed review comments

* [MM-493]: Fixed CI

server/webhook.go

@@ -230,8 +230,11 @@ func (p *Plugin) permissionToProject(ctx context.Context, userID, namespace, pro
 		return false
 	}
 
-	// Check for guest level permissions
-	if result.Permissions.ProjectAccess == nil || result.Permissions.ProjectAccess.AccessLevel == gitlabLib.GuestPermissions {
+	// User permission for the project
+	userPermission := result.Permissions
+
+	// Check if the user has guest permission or less for both project and group level
+	if (userPermission.ProjectAccess != nil && userPermission.ProjectAccess.AccessLevel <= gitlabLib.GuestPermissions) || (userPermission.GroupAccess != nil && userPermission.GroupAccess.AccessLevel <= gitlabLib.GuestPermissions) {
 		return false
 	}