griffinwebserver_v2-middleware-session/example.js

session middleware for griffinwebserver_v2

const Webserver = require('griffinwebserver_v2');
const session = require('griffinwebserver_v2-middleware-session');
const webserver = new Webserver('www/', 8080);
webserver.start();

function isJSON(str) {
  try {
    JSON.parse(str);
    return true;
  } catch (e) {
    return false;
  }
}

function apiFunction(req, res) {
  const baseUrl = 'http://' + req.headers.host + '/';
  const parsedUrl = new URL(req.url, baseUrl);

  // split the path into parts after removing leading /
  const pathParts = parsedUrl.pathname.substring(1).split('/');
  const apiName = pathParts[1]; // the second part of the path is the API name, first is /api/

  let responseBody;
  let body = []; // any posted data will go here
  let data = {};

  req.on('data', (data) => {
    body.push(data)
  });

  req.on('end', function () {
    dataDone();
  })

  function dataDone() {
    // convert posted data to data
    body = Buffer.concat(body).toString(); // convert to string
    if(isJSON(body)) body = JSON.parse(body); // parse the data if it is json

    req.session.data.counter = (req.session.data.counter || 0) + 1; // increment the counter of request made in this session
    req.statusCode = 200; // default status is Ok
    switch(apiName) {
      case 'hello':
        responseBody = 'Hello, world!';
        break;
      case 'counter':
        responseBody = 'Counter: ' + req.session.data.counter;
        break;
      case 'login':
        if(body.username === 'admin' && body.password === 'password') {
          req.session.data.loggedIn = true;
          responseBody = 'Logged in';
        } else {
          req.session.data.loggedIn = false;
          req.statusCode = 401;
          responseBody = 'Invalid username or password';
        }
       break;
      case 'logout':
        if(req.session.data.loggedIn) {
          req.session.data.loggedIn = false;
          responseBody = 'Logged out';
        } else {
          req.statusCode = 401;
          responseBody = 'Not logged in';
        }
       break;
        default:
          req.statusCode = 404;
          responseBody = 'Invalid API name';
    }
    res.end(responseBody);
  }
}

webserver.addMiddleware('/api/', session);
webserver.addEndpoint('/api/', apiFunction);