index.js

app.router((route) => [
  route('/', Layout()),
  route('/:phone', requireLogin(Layout(Chat))),
  route('/login', Layout(Login))
])

function requireLogin (View) {
  return function (state, prev, send) {
    if (!state.user.name) send('user:requireLogin')
    return View(state, prev, send)
  }
}

model.js

{
  effects: {
    requireLogin: (data, state, send, done) => {
      db.getSession((err, body) => {
        if (err) {
          // Error with request
          return done(new Error('Error getting current session'))
        } else if (!body.userCtx.name) {
          // Not logged in
          send('redirect', '/login', done)
        } else {
          // Logged in
          send('user:set', body.userCtx, done)
        }
      })
    }
  }
}