material-framework/lib/controllers/auth/permissions.js

const _ = require('lodash')
const permissions = []

const permissionDescriptions = {}
const register = (perm, description) => {

  if (!permissions.includes(perm)) {
    permissions.push(perm)
    permissions.sort()
  }

  if (description) {
    permissionDescriptions[perm] = description
  }

}

const list = (req, res) => {
  res.status(200).send(
    _.chain(permissions)
    .sort()
    .map(key => ({
      key,
      description: permissionDescriptions[key]
    }))
    .value()
  )
}


module.exports = {
  register,
  list,
  permissions
}