A simplified general-purpose permissions system for node apps.

Table of Contents

• Table of Contents
• Installation
• Usage
• Documentation
  • hasPermission
  • grantPermission
  • removePermission
  • toPermissionsBuffer
  • fromPermissionsBuffer
  • toPermissionsBitString
  • toString
  • createPermissions
• Contributors
• LICENSE

Installation

Using npm:

npm install permissio

or if you prefer to use the yarn package manager:

yarn add permissio

or if you prefer to use the pnpm package manager:

pnpm add permissio

Usage

Using Permissio simplifies permission manipulation and storage through the intelligent use of bitfields.

At its core, you will be able to create an enum for your permissions, so long as the value of which is an integer.

Next, one can call any of the functions involved.

import { hasPermission, grantPermission, EMPTY_PERMISSIONS } from 'permissio';

enum Permissions {
    CREATE,
    DELETE,
    LIST,
    USER_CREATE,
}

const steve = grantPermission(
    EMPTY_PERMISSIONS,
    Permissions.CREATE,
    Permissions.DELETE,
    Permissions.LIST
);

console.log(hasPermission(steve, Permissions.CREATE)); // true
console.log(hasPermission(steve, Permissions.DELETE)); // true
console.log(hasPermission(steve, Permissions.LIST)); // true
console.log(hasPermission(steve, Permissions.DELETE)); // true
console.log(hasPermission(steve, Permissions.USER_CREATE)); // false

There is also a more class like interface for working with permissions.

import { createPermissions } from 'permissio';

enum Permissions {
    CREATE,
    DELETE,
    LIST,
    USER_CREATE,
}

// Let's crete steve's permissions starting with no permissions.
const steve = createPermissions();

steve.has(Permissions.CREATE); // false

// Let's grant him the permission.
steve.grant(Permissions.CREATE);

steve.has(Permissions.CREATE); // true

You can read more about this class like interface here.

Documentation

hasPermission

Gathering whether permissiondata contains a certain permission is as easy as follows:

hasPermission(steve, Permissions.USER_CREATE);

grantPermission

When you want to add a permission to permissiondata you can do that like so:

const permissionData = grantPermission(permissionData, Permissions.CREATE);

The above code adds the Permissions.CREATE permission to the permissionData.

removePermission

When you want to remove a permission from permissiondata you can do that like so:

const permissionData = removePermission(permissionData, Permissions.CREATE);

The above code removes the Permissions.CREATE permission from the permissionData.

toPermissionsBuffer

When you want to convert your permission to a buffer you can do that as follows:

const buffer = toPermissionsBuffer(permissionData);

fromPermissionsBuffer

Likewise to toPermissionsBuffer you can also get the permissiondata from a buffer:

const permissionData = fromPermissionsBuffer(buffer);

toPermissionsBitString

Converting the permissiondata to bitstring is as easy as:

const bitstring = toPermissionsBitString(permissionData);

toString

Since permissionData is simply a BigInt, you can convert it to a string like so:

const string = permissionData.toString();

createPermissions

As previously stated, this is a class like interface for working with permissions. It keeps track of the permissions and provides methods for manipulating them.

const permissions = createPermissions();

createPermissions can optionally take in Permissions as the initial starting permissions.

// Using bigint as the initial permissions.
const permissions = createPermissions(BigInt(1));

// Using Enum
const permissions = createPermissions(EMPTY_PERMISSIONS, Permissions.CREATE);

createPermissions returns an object that has the following methods:

• has (hasPermission)
• grant (grantPermission)
• remove (removePermission)
• toBigint
• toBuffer (toPermissionsBuffer)
• toBitString (toPermissionsBitString)
• toString

Remember that the returned object keeps track of the current permissions value by itself.

Contributors

LICENSE

This package is licensed under the GNU Lesser General Public License.