Implementing Security Best Practices

import DOMPurify from 'dompurify';

const dirty = '<script>alert("XSS")</script><p>Hello <b>World</b></p>';
const clean = DOMPurify.sanitize(dirty);
console.log(clean); // <p>Hello <b>World</b></p>

import escapeHtml from 'escape-html';

const userInput = '<script>alert("Hello")</script>';
const escaped = escapeHtml(userInput);
console.log(escaped); // &lt;script&gt;alert(&quot;Hello&quot;)&lt;/script&gt;

import { Auth } from '@ionic/auth';

const auth = new Auth({
  auth0Domain: 'your-domain.auth0.com',
  clientId: 'your-client-id'
});

auth.login().then(() => {
  console.log('User logged in');
});

import { HttpClientModule } from '@angular/common/http';
import { HttpsInterceptor } from './https.interceptor';

@NgModule({
  imports: [
    HttpClientModule
  ],
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: HttpsInterceptor,
      multi: true
    }
  ]
})
export class AppModule { }

import { Capacitor } from '@capacitor/core';
import { SecureStoragePlugin } from '@ionic-native/secure-storage';

if (Capacitor.isNativePlatform()) {
  const secureStorage = new SecureStoragePlugin();
  secureStorage.set({ key: 'api_key', value: process.env.API_KEY });
}

import { initializeApp } from 'firebase/app';
import { getAuth } from 'firebase/auth';

const firebaseConfig = {
  apiKey: "your-api-key",
  authDomain: "your-app.firebaseapp.com",
};

const app = initializeApp(firebaseConfig);
const auth = getAuth(app);

// Sign in with Google
const provider = new GoogleAuthProvider();
signInWithPopup(auth, provider)
  .then(result => {
    const user = result.user;
    console.log("Signed in as:", user.email);
  })
  .catch(error => {
    console.error("Login error:", error);
  });

<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; connect-src 'self' https://api.example.com; font-src 'self' https://fonts.googleapis.com; object-src 'none'; media-src 'self' blob:; frame-src 'self'; base-uri 'self';">

import DOMPurify from 'dompurify';

const dirtyHtml = '<script>alert("XSS")</script><p>Safe content</p>';
const cleanHtml = DOMPurify.sanitize(dirtyHtml);

console.log(cleanHtml); // <p>Safe content</p>

const config = {
  certificatePinning: true,
  allowedCertificates: [
    'a1b2c3d4e5f67890abcdef1234567890abcdef1234567890abcdef1234567890',
    'f0e9d8c7b6a59483726150493827160594837261504938271605948372615049'
  ],
  bypassOnDebug: true
};

import { SecureStoragePlugin } from '@ionic-native/secure-storage';

const storage = new SecureStoragePlugin();

// Store token securely
await storage.create('auth');
await storage.set('apiToken', 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...');

// Retrieve token
const token = await storage.get('apiToken');
console.log(token);

import { HttpClient } from '@angular/common/http';

interface ApiResponse {
  id: number;
  name: string;
}

const validateResponse = (response: ApiResponse): boolean => {
  return response.id && typeof response.name === 'string';
};

this.http.get<ApiResponse>(&#x27;/api/app&#x27;).subscribe({
  next: (res) => {
    if (validateResponse(res)) {
      console.log(&#x27;Valid response received&#x27;);
    } else {
      console.error(&#x27;Invalid response format&#x27;);
    }
  },
  error: (err) => console.error(&#x27;API Error&#x27;, err)
});