witspry-auth-ng-client

A comprehensive Angular library for OAuth2 authentication with PKCE (Proof Key for Code Exchange) support. This library provides secure, configurable, and easy-to-use OAuth2 authentication for Angular applications.

Features

• ✅ PKCE Support: Implements OAuth2 PKCE flow with SHA-256 for enhanced security
• ✅ Automatic Token Refresh: Handles token refresh automatically with configurable thresholds
• ✅ SSR Compatible: Works with Angular Universal and server-side rendering
• ✅ Configurable Storage: Support for localStorage, sessionStorage, or custom storage
• ✅ HTTP Interceptor: Automatically adds Bearer tokens to HTTP requests
• ✅ Route Guards: Protect routes with authentication and role-based guards
• ✅ TypeScript: Full TypeScript support with comprehensive type definitions
• ✅ Standalone Components: Support for Angular 14+ standalone components
• ✅ Customizable: Highly configurable to work with different OAuth2 providers

Installation

npm install witspry-auth-ng-client

Quick Start

1. Configure OAuth2 in your app

// app.config.ts
import { ApplicationConfig } from '@angular/core';
import { provideRouter } from '@angular/router';
import { provideOAuth2 } from 'witspry-auth-ng-client';

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes),
    provideOAuth2({
      clientId: 'your-client-id',
      redirectUri: 'http://localhost:4200/auth/callback',
      authorizationEndpoint: 'https://your-auth-server.com/auth/authorize',
      tokenEndpoint: 'https://your-auth-server.com/auth/oauth/token',
      revokeEndpoint: 'https://your-auth-server.com/auth/oauth/revoke',
      userInfoEndpoint: 'https://your-auth-server.com/userinfo',
      scope: 'openid profile email',
      audience: 'https://your-api.com'
    })
  ]
};

2. Add callback route

// app.routes.ts
import { Routes } from '@angular/router';
import { OAuth2CallbackComponent } from 'witspry-auth-ng-client';

export const routes: Routes = [
  {
    path: 'auth/callback',
    component: OAuth2CallbackComponent
  },
  // ... other routes
];

3. Use in your components

// login.component.ts
import { Component } from '@angular/core';
import { OAuth2Service } from 'witspry-auth-ng-client';

@Component({
  selector: 'app-login',
  template: `
    <button (click)="login()" [disabled]="!oauth2Service.isAuthenticationAvailable()">
      Login with OAuth2
    </button>
  `
})
export class LoginComponent {
  constructor(public oauth2Service: OAuth2Service) {}

  login() {
    this.oauth2Service.startAuthorization();
  }
}

4. Protect routes with guards

// app.routes.ts
import { Routes } from '@angular/router';
import { oauth2AuthGuard } from 'witspry-auth-ng-client';

export const routes: Routes = [
  {
    path: 'protected',
    component: ProtectedComponent,
    canActivate: [oauth2AuthGuard]
  }
];

Configuration Options

interface OAuth2Config {
  clientId: string;                    // OAuth2 Client ID
  redirectUri: string;                 // Redirect URI for callback
  authorizationEndpoint: string;       // Authorization endpoint URL
  tokenEndpoint: string;               // Token endpoint URL
  revokeEndpoint?: string;             // Token revocation endpoint (optional)
  userInfoEndpoint?: string;           // OIDC UserInfo endpoint (optional)
  audience?: string;                   // OAuth2 audience parameter (optional)
  scope: string;                       // OAuth2 scope parameter
  responseType?: 'code';               // Response type (default: 'code')
  codeChallengeMethod?: 'S256';        // PKCE method (default: 'S256')
  storage?: 'localStorage' | 'sessionStorage' | 'custom'; // Storage strategy
  customStorage?: OAuth2Storage;       // Custom storage implementation
  autoRefresh?: boolean;               // Enable auto token refresh (default: true)
  refreshThreshold?: number;           // Seconds before expiry to refresh (default: 300)
  logLevel?: 'none' | 'error' | 'warn' | 'info' | 'debug'; // Logging level
  nonce?: string;                      // Custom nonce (optional)
}

Advanced Usage

Custom Storage

import { OAuth2Storage } from 'witspry-auth-ng-client';

class CustomStorage implements OAuth2Storage {
  getItem(key: string): string | null {
    // Your custom storage logic
    return null;
  }
  
  setItem(key: string, value: string): void {
    // Your custom storage logic
  }
  
  removeItem(key: string): void {
    // Your custom storage logic
  }
}

// Use in configuration
provideOAuth2({
  // ... other config
  storage: 'custom',
  customStorage: new CustomStorage()
})

Custom Redirect Routes For Login And Logout

import { OAuth2Config } from 'witspry-auth-ng-client';

const oauth2Config: OAuth2Config = {
  clientId: 'your-client-id',
  redirectUri: 'http://localhost:4200/oauth2/callback',
  authorizationEndpoint: 'https://auth.example.com/oauth2/authorize',
  tokenEndpoint: 'https://auth.example.com/oauth2/token',
  scope: 'openid profile email',
  redirectRoute: '/dashboard'
  logoutRedirectRoute: '/home'
};

Role-based Guards

import { oauth2RoleGuard } from 'witspry-auth-ng-client';

const routes: Routes = [
  {
    path: 'admin',
    component: AdminComponent,
    canActivate: [oauth2RoleGuard({
      roles: ['admin', 'super-admin'],
      requireAll: false // User needs ANY of the roles
    })]
  }
];

Manual HTTP Interceptor Setup

// If you want to configure the HTTP interceptor manually
import { provideOAuth2WithoutInterceptor, oauth2InterceptorFn } from 'witspry-auth-ng-client';
import { provideHttpClient, withInterceptors } from '@angular/common/http';

export const appConfig: ApplicationConfig = {
  providers: [
    provideOAuth2WithoutInterceptor(config),
    provideHttpClient(
      withInterceptors([oauth2InterceptorFn])
    )
  ]
};

Using with NgModule (Legacy)

// app.module.ts
import { NgOAuth2PkceModule } from 'witspry-auth-ng-client';

@NgModule({
  imports: [
    NgOAuth2PkceModule.forRoot({
      clientId: 'your-client-id',
      // ... other config
    })
  ]
})
export class AppModule {}

API Reference

OAuth2Service

Methods

• startAuthorization(): Promise<void> - Start OAuth2 authorization flow
• handleCallback(): Promise<void> - Handle OAuth2 callback
• getAccessToken(): string | null - Get current valid access token
• getRefreshToken(): string | null - Get current refresh token
• isAuthenticated(): boolean - Check if user is authenticated
• getUserInfo(): Promise<UserInfoResponse> - Get user information
• refreshAccessToken(): Promise<string> - Manually refresh access token
• logout(): Promise<void> - Logout user and clear tokens

Properties

• authState$: Observable<AuthState> - Observable of authentication state
• authState: Signal<AuthState> - Signal of authentication state

Guards

• oauth2AuthGuard - Protect routes requiring authentication
• oauth2UnauthGuard - Protect routes for unauthenticated users only
• oauth2RoleGuard(config) - Protect routes based on user roles/permissions

Components

• OAuth2CallbackComponent - Handle OAuth2 callback with UI feedback

Browser Support

This library supports all modern browsers that support:

• Web Crypto API (for PKCE)
• ES2017+ features
• Angular 19+

Contributing

Contributions are welcome! Please read our contributing guidelines and submit pull requests to our repository.

Npm Publish

Update the version in package.json. Make sure the test cases are passing. Then run the following commands:

npm run build
cd .\dist\witspry-auth-ng-client\
npm publish

License

MIT License - see LICENSE file for details.

Changelog

1.0.0

• Initial release
• OAuth2 PKCE implementation
• Automatic token refresh
• SSR support
• Configurable storage
• HTTP interceptor
• Route guards
• TypeScript support

1.1.0

• Added config parameter logoutRedirectRoute

1.1.3

• Fix: error section was visible even on successful login.

1.1.5

• Downgraded to Angular 18 for LLM compatibility
• Resolved peer deps from Angular 18 till 20

1.1.7

• Fixed the logoutRedirectRoute issue

1.2.0

• Automatic token refresh with intervals based on access token expiry

1.3.0

• Updated Angular dependencies to Angular v21

1.3.3

• Fixed issue where on exception, the loading screen stucks
• Added user friendly error message