Permission engine

This is a permissions mechanism based on RBAC (roles), which can be incorporated into any javascript project. The return is always, ** true ** (has permission) or ** false ** (does not have access).

In the permissions check it only has sync functions, as we prioritize the speed of validations, so all async calls must be done before passing to the validator.

Install package

To install package use:

1. npm i permission-engine --save
2. yarn add permission-engine

Types, which are fundamental in the search engine.

Para uma melhor entendimento, buscamos usar os mesmos operadores igual mongoDB, pois já é um uso comum da comunidade.

1. $in - Must contain at least one;
2. $nin - Must not contain any, $nin is sugar for $not;
3. $and - Must contain all;
4. $not - It must contain none;
5. $regex - Regular expression;

Class Error ErrorPermissionEngine

This class to get error custom the permission-engine package

    import PermissionEngine, { ErrorPermissionEngine } from '../lib/permissionEngine.js';

    const userRuleOne = [];
    const case$allOne = [{
        $and: [
            'actum:partner',
            {$nin: ['page:report:pdf:reader']},
            {$regex: /page:report:\w*:reader/}
        ]
    }];    
    
    console.time('timerOne');
    let canAccess = false;
    
    try {
        const permissionEngine = new PermissionEngine();
        canAccess = permissionEngine.canAccess(userRuleOne, case$allOne.rule);
    } catch (ex) {
        if (ex instanceof ErrorPermissionEngine) {
          console.error('Error!', ex.message);
          // output Error! Fail, roles or userRoles is empty, verify roles and try again
        } else {
          throw ex;
        }
     }
    
      console.timeEnd('timerOne');
      console.log('Case one can access:', canAccess, '\n');

$in Operator This is an operator that will return true if it matches any "role" the user contains.

Example 1

    import PermissionEngine from 'permission-engine';

    const userPermission = ['actum:admin', 'page:client', 'page:client:create'];
    const routePermission =  [{
        $in: ['actum:admin']
    }];

    const permissionEngine = new PermissionEngine();
    const canAccess = permissionEngine.canAccess(userPermission, routePermission);
    // output true

Example 2

    import PermissionEngine from 'permission-engine';

    const userPermission = [
        'actum:user', 'page:report:pdf:reader', 'page:report:xls:reader',
        'page:report:docx:reader', 'page:report:odt:reader'
    ];
    const routePermission =  [{
        $in: [
            'actum:partner',
            { $regex: /page:report:\w*:reader/ }
        ]
    }];

    const permissionEngine = new PermissionEngine();
    const canAccess = permissionEngine.canAccess(userPermission, routePermission);
    // output true

Attention: The $nin operator follows the same principle as the $in operator but negates the expression.

$and operator this is an operator that will return true if it matches all rules.

Example 1

    import PermissionEngine from 'permission-engine';

    const userPermission = ['actum:partner', 'page:report:xlsx:reader', 'page:report:docx:reader', 'page:report:pdf:reader'];
    const routePermission =  [{
      $and: [
        'actum:partner',
        {$in: ['page:report:xlsx:reader', 'page:report:docx:reader']},
        {$nin: ['page:report:csv:reader']}
      ]
    }]

    const permissionEngine = new PermissionEngine();
    const canAccess = permissionEngine.canAccess(userPermission, routePermission);
    // output true

Attention: The $not operator follows the same principle as the $and operator, but negates the expression.

Use in projects

This permission engine will be used to create an ACL plugin for:

• Vuejs (frontEnd) - permission-vue;
• Hapijs (Backend) - Wait for the link soon;
• Expressjs (Backend) - Wait for the link soon;