Abusing sails' policies to use existing express middleware (ie. express-form)

form.js

// api/policies/form.js

// npm install express-form@@0.7.x in the root of your project - sails currently uses express 2
var form = require('express-form'),
    filter = form.filter,
    validate = form.validate;

// create our policy, which happens to be an express-form
module.exports = form( // Form filter and validation middleware
    filter("username").trim(),
    validate("username").required().is(/^[a-z]+$/),
    filter("password").trim(),
    validate("password").required().is(/^[0-9]+$/),
    filter("email").trim(),
    validate("email").isEmail()
);

policies.js

// config/policies.js

module.exports.policies = {
  // Configure the formtest action of the action controller to use the policy "forms"
  'test':
  {
	  'formtest': 'forms'
  }
};

TestController.js

// api/controllers/TestController.js

var TestController = {

  // since the policy will have run, we can now use req.form as "normal"
	formtest: function(req, res)
	{
		if (!req.form.isValid)
    {
			// Handle errors
			console.log(req.form.errors);
		}
    else
    {
			// Or, use filtered form data from the form object:
			console.log("Username:", req.form.username);
			console.log("Password:", req.form.password);
			console.log("Email:", req.form.email);
		}
    // render the view
		res.view();
	}

};
module.exports = TestController;

IT's working nicely. I actually like this approach. In a way it's acting as a filter and could be very handy to validate an API payload. Thanks a lot!!