How to generate and validate secrets dynamically using angular and C#

To enhance security in your application, you can implement dynamic secrets in Angular and validate them on the server side. Here are some steps and ideas to help you achieve this:

1. Generate Dynamic Secrets in Angular

You can use a combination of environment variables and a service to generate dynamic secrets.

Environment Variables

Store sensitive information in environment variables to avoid hardcoding them in your source code.

// environment.ts
export const environment = {
  production: false,
  secretKey: 'your-secret-key'
};

Secret Generation Service

Create a service to generate dynamic secrets.

// secret.service.ts
import { Injectable } from '@angular/core';
import { environment } from '../environments/environment';
import * as crypto from 'crypto-js';

@Injectable({
  providedIn: 'root'
})
export class SecretService {
  generateSecret(): string {
    const timestamp = new Date().getTime().toString();
    return crypto.HmacSHA256(timestamp, environment.secretKey).toString();
  }
}

2. Attach Secret to API Requests

Use an HTTP interceptor to attach the generated secret to your API requests.

// auth.interceptor.ts
import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler } from '@angular/common/http';
import { SecretService } from './secret.service';

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
  constructor(private secretService: SecretService) {}

  intercept(req: HttpRequest, next: HttpHandler) {
    const secret = this.secretService.generateSecret();
    const clonedRequest = req.clone({
      headers: req.headers.set('Authorization', `Bearer ${secret}`)
    });
    return next.handle(clonedRequest);
  }
}

3. Validate Secret on Server Side

On the server side, validate the secret by comparing it with the expected value.

Example in Node.js

const crypto = require('crypto-js');

function validateSecret(req, res, next) {
  const secret = req.headers['authorization'].split(' ')[1];
  const timestamp = new Date().getTime().toString();
  const expectedSecret = crypto.HmacSHA256(timestamp, process.env.SECRET_KEY).toString();

  if (secret === expectedSecret) {
    next();
  } else {
    res.status(401).send('Unauthorized');
  }
}

Thanks