使用Connect Roles进​​行Node.js角色授权

Question

I have been following Connect roles https://github.com/ForbesLindesay/connect-roles for authorization in my node js application every thing is coming through except this This is what documented in above link

user.can(action) and user.is(action)

Inside the views of an express application you may use user.can and user.is 

which are equivallent to req.user.can and req.user.is

e.g.

<% if (user.can('impersonate')) { %>
  <button id="impersonate">Impersonate</button>
<% } %>

I tried to use it but i am very much confused because in my view (my html page) how can i check for specific role. Do i have to call service for checking back in the server. Because i cannot use directly like in my app.js file as this

var user = require('connect-roles');
user.use('access private page', function (req) {
  if (req.user.role ==== 'moderator') {
    return true;
  }});
app.get('/private', user.can('access private page'), function (req, res) {
  res.render('private');
});

Answer 1

If you are using Jade it is as easy as:

if userCan('do something')
   button#special Do Something