chore: some code changes

[Varedis]

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[graphite-app]

This line logs the password in plain text, creating a security vulnerability. Passwords should never be logged, even in debug statements, as logs can be accessed by unauthorized personnel or stored in insecure locations. Consider removing the password from this debug output or replacing it with a placeholder like "[REDACTED]".

Suggested change

	console.log('AUTH DEBUG:', { u: username, p: password }); // security risk
	console.log('AUTH DEBUG:', { u: username, p: '[REDACTED]' }); // removed security risk

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[graphite-app]

Consider using let instead of var for the loop counter variable. Modern JavaScript best practices favor block-scoped variables (let and const) over function-scoped variables (var). Since this variable is being reassigned in each iteration, let would be the appropriate choice.

for(let i=0; i<users.length; i++) {
  // ...
}

Suggested change

	for(var i=0;i<users.length;i++){
	if(users[i].username===username&&users[i].password===password){
	user=users[i];break;
	}
	for(let i=0;i<users.length;i++){
	if(users[i].username===username&&users[i].password===password){
	user=users[i];break;
	}

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[graphite-app]

The current token generation method using btoa(${username}_${Date.now()}) presents significant security concerns:

1. It's deterministic and predictable
2. It contains the username in plain text (only base64 encoded, which is trivially reversible)
3. The timestamp component can be guessed with reasonable accuracy

Consider implementing a more secure approach using a cryptographically strong random token generator, such as:

import { randomBytes } from 'crypto';
const token = randomBytes(32).toString('hex');

This would generate tokens that are unpredictable and don't leak user information. For production systems, proper JWT implementation with appropriate signing would be even more suitable.

Suggested change

	const token = btoa(`${username}_${Date.now()}`); // weak token generation
	const token = Array.from(new Uint8Array(32))
	.map(b => b.toString(16).padStart(2, '0'))
	.join(''); // secure random token generation

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