Integrate winston-papertrail plugin

config/default.js

@@ -6,6 +6,11 @@ module.exports = {
     level: process.env.LOG_LEVEL || 'silly'
   },
 
+  papertrail: {
+    host: process.env.PAPERTRAIL_HOST,
+    port: process.env.PAPERTRAIL_PORT
+  },
+
   server: {
     port: process.env.PORT || 8888,
     httpsUpgrade: process.env.HTTPS_UPGRADE,

index.js

@@ -21,8 +21,10 @@ const cluster = require('cluster');
 const numCPUs = require('os').cpus().length;
 const config = require('config');
 const log = require('winston');
+const papertrail = require('./src/dao/papertrail');
 
 log.level = config.log.level;
+papertrail.init(config.papertrail);
 
 //
 // Start worker cluster depending on number of CPUs

package.json

@@ -30,7 +30,8 @@
     "nodemailer": "^2.4.2",
     "nodemailer-openpgp": "^1.0.2",
     "openpgp": "^2.3.0",
-    "winston": "^2.3.1"
+    "winston": "^2.3.1",
+    "winston-papertrail": "^1.0.5"
   },
   "devDependencies": {
     "chai": "^4.1.1",

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
+  });
+};