Using encrypted client-sessions with koa

koa-client-sessions.js

var koa = require('koa');
var sessions = require("client-sessions");

var app = koa();
var middleware = sessions({
  cookieName: '_xyz',
  secret: 'blah',
  duration: 2400000
});

app.use(function *(next) {
  var context = this;
  var req = context.request.req;
  var res = context.response.res;
  yield middleware.bind(null, req, res);
  Object.defineProperty(context, 'session', {
    get: function () { return req.session; }
  });
  yield next;
});

app.listen(9999);