Add 32-byte random string generator utility

[chungyau97]

Description

This function generates a random 32-byte string in hexadecimal format. It can be used for creating unique tokens, keys, or other random values as needed.

Result

Logs shown are for demonstration purposes only and are not included in this PR.

Custom EXPRESS_SESSION_SECRET	Generated Secret (Run 1)	Generated Secret (Run 2)

[gemini-code-assist]

Summary of Changes

Hello @chungyau97, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the application's security by implementing a robust mechanism for generating cryptographically secure random strings. This new utility is primarily integrated to ensure that the session secret, a critical component for session management, defaults to a strong, randomly generated value when not explicitly provided. This change moves away from a static default, thereby bolstering the application's resilience against potential security vulnerabilities related to predictable session secrets.

Highlights

• New Utility Function: Introduced a new utility function, generateRandomString32, which creates a cryptographically secure 32-byte random hexadecimal string.
• Enhanced Session Security: The application's session middleware now utilizes the new random string generator to provide a secure default EXPRESS_SESSION_SECRET if one is not explicitly configured in the environment, replacing a previously hardcoded default.
• Environment Variable Examples: Updated the .env.example files across different modules to showcase an example of a securely generated 32-byte random string for the EXPRESS_SESSION_SECRET.

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[gemini-code-assist]

Code Review

This pull request introduces a utility function to generate a 32-byte cryptographically secure random string and uses it to create a default session secret for express-session. This is a significant security improvement, as it replaces a hardcoded default secret. The example environment files have also been updated to reflect this change. My feedback includes a suggestion to add a JSDoc comment to the new utility function for better clarity.