DEV Community

Mohammad Waseem
Mohammad Waseem

Posted on

Leveraging TypeScript to Bypass Gated Content in Automated Testing

#typescript #automation #qa

In modern web applications, gated content—such as premium articles, user profiles, or exclusive resources—is a common feature that restricts access based on user authentication or subscription status. As a Lead QA Engineer, ensuring the integrity of these access controls is critical. However, when proper documentation or backend design is lacking, it can be challenging to test these restrictions effectively. This post explores how to utilize TypeScript for client-side manipulation to bypass gated content during automated testing, providing a reliable approach to validate access controls.

Understanding the Challenge

Often, the primary obstacle is the app's reliance on backend validation with minimal frontend hints. Without clear documentation, testers might not know exactly how content gating is enforced—whether through DOM attributes, cookies, local storage, or API responses. The goal is to find a way to emulate an authorized state or manipulate the frontend to reveal the content, thus verifying the gating logic.

Approach: TypeScript as a Tool for Manipulation

TypeScript offers strong typing and tooling support, which makes it ideal for scripting complex DOM operations and state manipulations. The strategy involves inspecting the DOM, identifying access restrictions, and programmatically altering the interface or underlying variables to simulate authorized access.

Step-by-Step Implementation

1. Inspect the Gated Content

Using browser dev tools, identify how the gated content is hidden. Common patterns include:

  • Presence of overlay divs or classes like .locked
  • Attributes such as aria-hidden="true"
  • CSS styles like display: none
  • Content wrapped in elements with a specific ID or class

For example:

<div class="gated-content" style="display: none;">Premium Content</div>
Enter fullscreen mode Exit fullscreen mode

2. Write TypeScript to Detect and Manipulate

Create a script that locates the gated content and changes the DOM or variables to make it accessible.

// Locate the gated content container
const gatedContent = document.querySelector('.gated-content') as HTMLElement;

// Check if the content exists and is hidden
if (gatedContent && getComputedStyle(gatedContent).display === 'none') {
  // Remove the style to reveal content
  gatedContent.style.display = 'block';
  console.log('Gated content bypassed successfully.');
}
Enter fullscreen mode Exit fullscreen mode

3. Handle Authentication or State Variables

Sometimes, the gating is controlled via JavaScript variables or cookies. To emulate an authenticated state:

// Example: Set a cookie to simulate login
document.cookie = 'userAuth=authenticated; path=/;';

// Or modify a global variable
(window as any).isUserLoggedIn = true;
Enter fullscreen mode Exit fullscreen mode

4. Automate with Testing Frameworks

In integration or E2E tests (e.g., with Cypress or Playwright), embed such scripts to automate the bypass process. Here's an example with Playwright:

import { test } from '@playwright/test';

test('Bypass gated content', async ({ page }) => {
  await page.goto('https://example.com');
  await page.evaluate(() => {
    const gatedContent = document.querySelector('.gated-content') as HTMLElement;
    if (gatedContent && getComputedStyle(gatedContent).display === 'none') {
      gatedContent.style.display = 'block';
    }
    // Emulate login state if needed
    (window as any).isUserLoggedIn = true;
  });
  // Proceed with assertions
  const content = await page.innerText('.gated-content');
  expect(content).toContain('Premium Content');
});
Enter fullscreen mode Exit fullscreen mode

Important Considerations

  • Security: These manipulations are only suitable for testing environments, not production. Never deploy bypass scripts outside of controlled testing conditions.
  • Backend Validation: Always verify that backend access controls are in place; client-side manipulations only validate frontend behavior.
  • Documentation: Even if lacking initial documentation, aim to document the gating mechanisms discovered during this process for future teams.

Conclusion

Using TypeScript to manipulate DOM and JavaScript state provides a powerful method for testing gated content, especially in scenarios with poorly documented systems. The key is careful inspection of the client-side code and crafting scripts that reliably simulate the conditions required for access. When combined with robust testing frameworks, these techniques enable comprehensive validation of access restrictions and improve overall system security and integrity.

By mastering such manipulation techniques, QA engineers can uncover potential vulnerabilities, ensure proper access controls, and contribute to the development of more secure web applications.

🛠️ QA Tip

To test this safely without using real user data, I use TempoMail USA.

Top comments (0)