openhim-core/lib/middleware/proxy.js

The OpenHIM core application that provides logging and routing of http requests

var Q, SDC, application, config, domain, logger, os, sdc, setupProxyHeaders, statsdServer;

logger = require("winston");

Q = require("q");

config = require('../config/config');

statsdServer = config.get('statsd');

application = config.get('application');

SDC = require('statsd-client');

os = require('os');

domain = (os.hostname()) + "." + application.name + ".appMetrics";

sdc = new SDC(statsdServer);

exports.setupProxyHeaders = setupProxyHeaders = function(ctx) {
  var setOrAppendHeader;
  setOrAppendHeader = function(ctx, header, value) {
    if (!value) {
      return;
    }
    if (ctx.header[header]) {
      return ctx.header[header] = ctx.header[header] + ", " + value;
    } else {
      return ctx.header[header] = "" + value;
    }
  };
  setOrAppendHeader(ctx, 'X-Forwarded-For', ctx.request.ip);
  return setOrAppendHeader(ctx, 'X-Forwarded-Host', ctx.request.host);
};

exports.koaMiddleware = function*(next) {
  var startTime;
  if (statsdServer.enabled) {
    startTime = new Date();
  }
  exports.setupProxyHeaders(this);
  if (statsdServer.enabled) {
    sdc.timing(domain + ".proxyHeadersMiddleware", startTime);
  }
  return (yield next);
};

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