#!/usr/bin/env node

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla BrowserID.
 *
 * The Initial Developer of the Original Code is Mozilla.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Brian J Brennan <brian@nyhacker.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

const
util = require("util"),
path = require('path'),
url = require('url'),
fs = require('fs'),
express = require('express'),
computecluster = require('compute-cluster'),
metrics = require('../lib/metrics'),
heartbeat = require('../lib/heartbeat'),
logger = require('../lib/logging').logger,
config = require('../lib/configuration'),
shutdown = require('../lib/shutdown'),
statsd = require('../lib/statsd');

logger.info("verifier server starting up");

var app = express.createServer();

// setup health check / heartbeat (before logging)
heartbeat.setup(app);

// request to logger, dev formatted which omits personal data in the requests
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.verifier."
  }));
}

app.use(express.bodyParser());

try {
  // explicitly relay VAR_PATH to children
  process.env['VAR_PATH'] = config.get('var_path');

  // allocate a compute cluster
  var cc = new computecluster({
    module: path.join(__dirname, "..", "lib", "verifier", "verifier-compute.js"),
    max_processes: config.get('max_compute_processes')
  }).on('error', function(e) {
    logger.error("error detected in verification computation process!  fatal: " + e.toString());
    setTimeout(function() { process.exit(1); }, 0);
  }).on('info', function(msg) {
    logger.info("(compute cluster): " + msg);
  }).on('debug', function(msg) {
    logger.debug("(compute cluster): " + msg);
  });
} catch(e) {
  process.stderr.write("can't allocate compute cluster: " + e + "\n");
  process.exit(1);
}

app.post('/verify', function(req, resp, next) {
  req.body = req.body || {}

  var assertion = (req.query && req.query.assertion) ? req.query.assertion : req. body.assertion;
  var audience = (req.query && req.query.audience) ? req.query.audience : req.body.audience;

  if (!(assertion && audience)) {
    // why couldn't we extract these guys?  Is it because the request parameters weren't encoded as we expect? GH-643
    const want_ct = [ 'application/x-www-form-urlencoded', 'application/json' ];
    try {
      var ct = req.headers['content-type'];
      if (ct.indexOf(';') != -1) ct = ct.substr(0, ct.indexOf(';'));
      if (want_ct.indexOf(ct) == -1) throw "wrong content type";
    } catch (e) {
      return resp.json({ status: "failure", reason: "Content-Type expected to be one of: " + want_ct.join(", ") });
    }
    return resp.json({ status: "failure", reason: "need assertion and audience" });
  }

  var startTime = new Date();
  cc.enqueue({
    assertion: assertion,
    audience: audience
  }, function (err, r) {
    var reqTime = new Date - startTime;
    statsd.timing('assertion_verification_time', reqTime);

    // consider "application" errors to be the same as harder errors
    if (!err && r && r.error) err = r.error;
    else if (!r || !r.success) err = "no response returned from child process";

    if (err) {
      resp.json({"status":"failure", reason: err});
      metrics.report('verify', {
        result: 'failure',
        rp: audience
      });
    } else {
      resp.json({
        status : "okay",
        email : r.success.email,
        audience : audience, // NOTE: we return the audience formatted as the RP provided it, not normalized in any way.
        expires : new Date(r.success.expires).valueOf(),
        issuer: r.success.issuer
      });

      metrics.report('verify', {
        result: 'success',
        rp: r.success.audience
      });
    }
  });
});

// shutdown when /code_update is invoked
shutdown.installUpdateHandler(app);

// custom 404
app.use(function(req, res,next) {
  res.statusCode = 404;
  res.write("Cannot find this resource");
  res.end();
});

// shutdown nicely on signals
shutdown.handleTerminationSignals(app, function() {
  cc.exit();
});

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