angel_security 1.1.0

security #

version 1.0.2 build status

Angel middleware designed to enhance application security by patching common Web security holes.

Sanitizing HTML #


// Or:

CSRF Tokens #

app.chain(verifyCsrfToken()).post('/form', ...);

Banning by IP #


// Or a range:

// Or multiple filters:
app.before.add(banIp(['', '192.*.*.*', new RegExp(r'1\.2.\3.\4')]));

// Also can ban origins

// By default, `banOrigin` forces users to have an `Origin` header.
// Use this flag to disable it:
app.before.add(banOrigin('', allowEmptyOrigin: true));

Trusted Proxy #

Works well with Apache or Nginx.

// ONLY trust localhost X-Forwarded-* headers

Throttling Requests #

Throws a 429 error if the given rate limit is exceeded.

// Example: 5 requests per minute
app.before.add(throttleRequests(5, new Duration(minutes: 1)));

Helmet #

Supplementary security library

Service Hooks #

Also included are a set of service hooks, some ported from FeathersJS. Others are created just for Angel.

import 'package:angel_security/hooks.dart' as hooks;


  • addUserToParams
  • associateCurrentUser,
  • hashPassword
  • queryWithCurrentUser
  • restrictToAuthenticated
  • restrictToOwner
  • variantPermission

Also exported is the helper function isServerSide. Use this to determine whether a service method is being called by the server, or by a client.

Permissions #

Permissions are a great way to restrict access to resources.

They take the form of:

  • service:foo
  • service:create:*
  • some:arbitrary:permission:*:with:*:a:wild:*card

The specifics are up to you.

var permission = new Permission('admin | users:find');

// Or:
// PermissionBuilders support + and | operators. Operands can be Strings, Permissions or PermissionBuilders.
var permission = (new PermissionBuilder('admin') | (new PermissionBuilder('users') + 'find')).toPermission();

// Transform into middleware
app.chain(permission.toMiddleware()).get('/protected', ...);

// Or as a service hook

// Dynamically create a permission hook.
// This helps in situations where the resources you need to protect are dynamic.
// `variantPermission` is included in the `package:angel_security/hooks.dart` library.
app.service('posts').beforeModify(variantPermission((e) {
    return new PermissionBuilder('posts:modify:${}');

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  angel_security: ^1.1.0

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:angel_security/angel_security.dart';
Describes how popular the package is relative to other packages. [more]
Code health derived from static analysis. [more]
Reflects how tidy and up-to-date the package is. [more]
Weighted score of the above. [more]
Learn more about scoring.

The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Analysis issues and suggestions

Support Dart 2 in pubspec.yaml.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.19.0