index.js

var express = require('express');
var app = module.exports = express();
var semver = require('semver');
var nconf = require('nconf');
var path = require('path');
var App = require('./models');

nconf.argv().env().use('memory').defaults({
  PORT: 8080
});

app.use(require('mongodb-favicon/express'));

app.use(function(req, res, next) {
  var platform = req.params.os || 'osx';
  if (platform === 'darwin') {
    platform = 'osx';
  }
  req.platform = platform;
  next();
});

var apps = {
  'mongodb-compass': {
    repo: '10gen/compass',
    filename: function(req) {
      if (req.platform === 'osx') {
        return new RegExp('MongoDBCompass-.*-darwin-x64\.dmg');
      }
      return new RegExp('MongoDBCompassSetup-.*\.exe');
    }
  }
};

app.set('views', path.resolve(__dirname, './views'));
app.set('view engine', require('jade').__express);

app.param('app', function(req, res, next, name) {
  if (!apps[name]) {
    return res.status(404);
  }
  req.locals = {
    app: App.get(name, apps[name].repo),
    filename: apps[name].filename
  };
  next();
});

app.param('v', function(req, res, next, v) {
  req.locals.app.version(v, function(err, release) {
    if (err) return next(err);

    req.locals.release = release;
    next();
  });
});

function installScript(go) {
  go = go || false;
  return function(req, res, next) {
    var ctx = {
      app: req.locals.app,
      url: 'http://' + req.headers.host,
      go: go
    };
    app.render('install.jade', ctx, function(err, text) {
      if (err) return next(err);
      res.set('Content-Type', 'text/plain');
      res.send(text);
    });
  };
}

app.get('/', function(req, res) {
  res.send(Object.keys(apps).map(function(_id) {
    return {
      _id: _id,
      href: 'http://' + req.headers.host + '/' + _id
    };
  }));
});

app.get('/squirrel', function(req, res) {
  res.set('Content-Type', 'text/plain');
  res.send([
    '                                _',
    '                          .-\'` `}',
    '                  _./)   /       }',
    '                .\'o   \ |       }',
    '                \'.___.\'`.\    {`',
    '                /`\_/  , `.    }',
    '                \=\' .-\'   _`\  {',
    '                 `\'`;/      `,  }',
    '                    _\       ;  }',
    '                   /__`;-...\'--\''
  ].join('\n'));
});

app.get('/:app/install', installScript(false));
app.get('/:app/go', installScript(true));

/**
 * @todo (imlucas): Figure out a good way to do app metadata.
 */
app.get('/:app', function(req, res) {
  res.redirect('/' + req.param('app') + '/releases');
});

app.get('/:app/releases', function(req, res, next) {
  req.locals.app.list(function(err, releases) {
    if (err) return next(err);
    res.send(releases);
  });
});

app.get('/:app/releases/:v', function(req, res) {
  if (!req.locals.release) {
    return res.status(404).send('No releases for this app.');
  }
  if (!req.query.version) return res.send(req.locals.release);

  var want = req.query.version;
  var latest = req.locals.release;
  var update = want === '0.0.0' || semver.lt(want, latest.version);

  return update ? res.status(200).send(latest) : res.status(204).send('');
});

app.get('/:app/releases/:v/download', function(req, res) {
  var wanted = req.locals.filename(req);
  var asset = req.locals.release.assets.filter(function(a) {
    return wanted.test(a.name);
  })[0];

  if (!asset) {
    return res.status(404)
      .send('No asset named '
        + wanted
        + 'in the release: '
        + JSON.stringify(req.locals.release, null, 2));
  }
  res.redirect(asset.browser_download_url + '?access_token=' + process.env.GITHUB_TOKEN);
});