LevelUp adapter for ACL

This project is an adapter for LevelUP library for the NODE ACL project.

Installation

$ npm install node_acl_levelup

Usage

You can get started by simply creating a new LevelUP instance with the backing store of your choice. Since version 0.9, LevelDOWN is purely optional, and you can use MemDOWN for an in-memory solution.

// LevelUP database
var levelup = require('levelup');
var memdown = require('memdown');
var db = levelup({ db: memdown });

var Acl = require('node_acl_levelup');

var acl = new Acl(new Acl.levelupBackend(db, 'acl'));

// guest is allowed to view blogs
acl.allow('guest', 'blogs', 'view', function (err) {
  if (err) { throw err; }

  // Add a user to guest
  acl.addUserRoles('joed', 'guest', function (err) {
    if (err) { throw err; }

    // Check whether user joed can view blogs
    acl.isAllowed('joed', 'blogs', 'view', function(err, result) {
      if (err) { throw err; }

      console.log('User joed is allowed to view blogs? ', result);
  });
});
// => User joed is allowed to view blogs? true

Known Issues

Currently, due to sequencing issues within the NODE ACL project, the batch processing of allowing resources is not supported, such as the following:

acl.allow(
  [
    {
      roles: 'fumanchu',
      allows: [
        {resources: 'blogs', permissions: 'get'},
        {resources: ['forums','news'], permissions: ['get','put','delete']},
        {resources: ['/path/file/file1.txt', '/path/file/file2.txt'], permissions: ['get','put','delete']}
      ]
    }
  ],
  function (err) {
    if (err) { throw err; }
  }
);

Instead, the nested approach is the only approach which works.

acl.allow('fumanchu', ['blogs'], ['get'], function (err) {
  if (err) { throw err; }

  acl.allow('fumanchu', ['forums', 'news'], ['get', 'put', 'delete'], function (err) {
    if (err) { throw err; }

    acl.allow('fumanchu', ['/path/file/file1.txt', '/path/file/file2.txt'], ['get', 'put', 'delete'], function (err) {
      if (err) { throw err; }
    })
  });
});

This can be of course alleviated by such modules as async.

var async = require('async');

async.series([
  function (cb) {
    acl.allow('fumanchu', ['blogs'], ['get'], cb);
  },
  function (cb) {
    acl.allow('fumanchu', ['forums', 'news'], ['get', 'put', 'delete'], cb);
  },
  function (cb) {
    acl.allow('fumanchu', ['/path/file/file1.txt', '/path/file/file2.txt'], ['get', 'put', 'delete'], cb);
  }
], function (err) {
  if (err) { throw err; }
});

Or even RxJS.

var Rx = require('rx');

var allow = Rx.Observable.fromNodeCallback(acl.allow, acl);

var source = Rx.Observable.concat(
  allow('fumanchu', ['blogs'], ['get']),
  allow('fumanchu', ['forums', 'news'], ['get', 'put', 'delete']),
  allow('fumanchu', ['/path/file/file1.txt', '/path/file/file2.txt'], ['get', 'put', 'delete'])
);

source.subscribe(
  function () { /* Nothing to see here */ },
  function (err) { console.log(err); },
  function () { console.log('done'); }
)

License

The MIT License (MIT)

Copyright (c) 2015 Microsoft Corporation

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.