Express Github OAuth2 flow

github_oauth2.js

exports.github = function (req, res) {
    res.redirect(config.Github.API_ROOT + config.Github.PATH_AUTHENTICATE + '?client_id=' + config.Github.CLIENT_ID);
};

exports.githubCallback = function (req, res) {
    var code = req.query.code;

    var post_data = querystring.stringify({
          code: code
        , client_id: config.Github.CLIENT_ID
        , client_secret: config.Github.CONSUMER_SECRET
    });

    var post_headers = {
          'Content-Type': 'application/x-www-form-urlencoded'
        , 'Content-Length': post_data.length
    };

    var post_options = {
          host: config.Github.HOSTNAME
        , port: 443 
        , path: config.Github.PATH_ACCESS_TOKEN
        , method: 'POST'
        , headers: post_headers
    };

    var post_req = https.request(post_options, function(res) {
        res.setEncoding('utf8');
            res.on('data', function (chunk) {
            console.log('Response: ' + chunk);
        });
    });

    post_req.write(post_data);
    post_req.end();
};