seneca-perm backwards compatibility layer

The new entity-access layer provides a simpler way to resolve the same requirements that the existing seneca-perm module currently handles.

But because you might already have a configured app, it might not be feasible to re-develop the entire access control layer you have written.

This module will allow you to drive the new entity-access layer through a mostly-unmodified 'seneca-perm' options object.

Usage:

1. Create an entities/foo/acl.js file.
2. In this file:

var db = require('../db');

var aclSeneca = require('seneca-entity-access/perm');
var perms = require('./config/options.permissions');

module.exports = aclSeneca(db, 'foo', perms.accessControls);

1. Load this file into the acl module in entities/foo/index.js

options.permissions changes:

1. Go through each acl in the options.permissions file manually.

2. You only care about records that match all of these criteria :

   • Is the entity type you care about.
   • Has 'list' amongst it's actions.
   • Has control set to 'requisite', 'required' or 'sufficient'.

3. For each of these records, make the following changes :

   • Give the acl entry a 'lock' property with a simple identifier.
   • If the test has to be negative, add: reject: true to the object. ie: users in manual blacklist are NOT allowed.
   • If the entry uses a fn condition, you will need to reimplement it.

Re-implementing fn conditions

(see acl documentation)

TODO:

• use s-expression like syntax for the middlepoint between other engines.
• Support filtering of records at various places in the workflow.
• Set of seneca actions that allow/deny requests based on new acl.