env.js

/*
== BSD2 LICENSE ==
Copyright (c) 2014, Tidepool Project

This program is free software; you can redistribute it and/or modify it under
the terms of the associated License, which is identical to the BSD 2-Clause
License as published by the Open Source Initiative at opensource.org.

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 License for more details.

You should have received a copy of the License along with this program; if
not, you can obtain one from Tidepool Project at tidepool.org.
== BSD2 LICENSE ==
 */
'use strict';

var fs = require('fs');
var amoeba = require('amoeba');
var config = amoeba.config;
var cs = amoeba.mongoUtil.toConnectionString

function maybeReplaceWithContentsOfFile(obj, field)
{
  var potentialFile = obj[field];
  if (potentialFile != null && fs.existsSync(potentialFile)) {
    obj[field] = fs.readFileSync(potentialFile).toString();
  }
}

module.exports = (function(){
  var env = {};

  // The port to attach an HTTP listener, if null, no HTTP listener will be attached
  env.httpPort = process.env.PORT || null;

  // The port to attach an HTTPS listener, if null, no HTTPS listener will be attached
  env.httpsPort = process.env.HTTPS_PORT || null;

    // The https config to pass along to https.createServer.
  var theConfig = process.env.HTTPS_CONFIG || null;

  env.httpsConfig = null;

  if (theConfig != null) {
    env.httpsConfig = JSON.parse(theConfig);
    maybeReplaceWithContentsOfFile(env.httpsConfig, 'key');
    maybeReplaceWithContentsOfFile(env.httpsConfig, 'cert');
    maybeReplaceWithContentsOfFile(env.httpsConfig, 'pfx');
  }

  if (env.httpsPort != null && env.httpsConfig == null) {
    throw new Error('No https config provided, please set HTTPS_CONFIG with at least the certificate to use.');
  }

  if (env.httpPort == null && env.httpsPort == null) {
    throw new Error('Must specify either PORT or HTTPS_PORT in your environment.');
  }

  env.mongoDbConnectionString = cs('messages')

  env.metrics = {
    // The config object to discover highwater (the metrics API).
    serviceSpec: JSON.parse(config.fromEnvironment('METRICS_SERVICE'))
  };

  env.userApi = {
    // The config object to discover user-api.
    serviceSpec: JSON.parse(config.fromEnvironment('USER_API_SERVICE')),

    // Name of this server to pass to user-api when getting a server token
    serverName: config.fromEnvironment('SERVER_NAME', 'message-api'),

    // The secret to use when getting a server token from user-api
    serverSecret: config.fromEnvironment('SERVER_SECRET')
  };

  env.seagull = {
    // The config object to discover seagull.
    serviceSpec: JSON.parse(config.fromEnvironment('SEAGULL_SERVICE'))
  };

  env.gatekeeper = {
    // The config object to discover gatekeeper.
    serviceSpec: JSON.parse(config.fromEnvironment('GATEKEEPER_SERVICE'))
  };

  // The host to contact for discovery
  if (process.env.DISCOVERY_HOST != null) {
    env.discovery = {
       host: process.env.DISCOVERY_HOST,
    }

    // The service name to expose to discovery
    env.serviceName = config.fromEnvironment('SERVICE_NAME');

    // info for properly tagging metrics
    env.metricsSource = env.serviceName;
    env.metricsVersion = require('./package.json').version;

    // The local host to expose to discovery
    env.publishHost = config.fromEnvironment('PUBLISH_HOST');
  }

  //delete window for cleaning up messages
  env.deleteWindow = config.fromEnvironment('DELETE_TIME_WINDOW', 14);

  return env;
})();