#!/usr/bin/env node

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const
fs = require('fs'),
path = require('path'),
url = require('url'),
http = require('http');
urlparse = require('urlparse'),
express = require('express'),
wsapi = require('../lib/wsapi.js'),
httputils = require('../lib/httputils.js');
secrets = require('../lib/secrets.js'),
db = require('../lib/db.js');
config = require('../lib/configuration.js'),
heartbeat = require('../lib/heartbeat.js'),
metrics = require('../lib/metrics.js'),
logger = require('../lib/logging.js').logger,
shutdown = require('../lib/shutdown');

var app = undefined;

app = express.createServer();

logger.info("dbwriter starting up");

// Setup health check / heartbeat middleware.
// This is in front of logging on purpose.  see issue #537
heartbeat.setup(app, function(cb) {
  // ping the database to verify we're really healthy.
  db.ping(function(e) {
    if (e) logger.error("database ping error: " + e);
    cb(!e);
  });
});

// logging!  all requests other than __heartbeat__ are logged
app.use(express.logger({
  format: config.get('express_log_format'),
  stream: {
    write: function(x) {
      logger.info(typeof x === 'string' ? x.trim() : x);
    }
  }
}));

var statsd_config = config.get('statsd');
if (statsd_config && statsd_config.enabled) {
  logger_statsd = require("connect-logger-statsd");
  app.use(logger_statsd({
    host: statsd_config.hostname || "localhost",
    port: statsd_config.port || 8125,
    prefix: statsd_config.prefix || "browserid.dbwriter."
  }));
}

// Add Strict-Transport-Security headers if we're serving over SSL
if (config.get('scheme') == 'https') {
  app.use(function(req, resp, next) {
    // expires in 30 days, include subdomains like www
    resp.setHeader("Strict-Transport-Security", "max-age=2592000; includeSubdomains");
    next();
    });
}

// prevent framing of everything.  content underneath that needs to be
// framed must explicitly remove the x-frame-options
app.use(function(req, resp, next) {
  resp.setHeader('x-frame-options', 'DENY');
  next();
});

// verify all JSON responses are objects - prevents regression on issue #217
app.use(function(req, resp, next) {
  var realRespJSON = resp.json;
  resp.json = function(obj) {
    if (!obj || typeof obj !== 'object') {
      logger.error("INTERNAL ERROR!  *all* json responses must be objects");
      throw "internal error";
    }
    realRespJSON.call(resp, obj);
  };
  return next();
});

// handle /wsapi requests
wsapi.setup({
  only_write_apis: true
}, app);

function doShutdown(readyForShutdownCB) {
  require('../lib/bcrypt.js').shutdown();
  db.close(readyForShutdownCB)
}

// open the databse
db.open(config.get('database'), function (error) {
  if (error) {
    logger.error("can't open database: " + error);
    // let async logging flush, then exit 1
    return process.nextTick(function() { process.exit(1); });
  }

  // shut down express gracefully on SIGINT
  shutdown.handleTerminationSignals(app, doShutdown);

  var bindTo = config.get('bind_to');
  app.listen(bindTo.port, bindTo.host, function() {
    logger.info("running on http://" + app.address().address + ":" + app.address().port);
  });
});