Integrate winston-papertrail plugin

src/dao/papertrail.js

@@ -0,0 +1,36 @@
+/**
+ * Mailvelope - secure email with OpenPGP encryption for Webmail
+ * Copyright (C) 2016 Mailvelope GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License version 3
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+'use strict';
+
+const log = require('winston');
+const config = require('config');
+require('winston-papertrail');
+
+log.exitOnError = false;
+log.level = config.log.level;
+
+exports.init = function({host, port}) {
+  if (!host || !port) {
+    return;
+  }
+  log.add(log.transports.Papertrail, {
+    level: config.log.level,
+    host,
+    port
+  });
+};