How to implement 'Token Based Authentication' securely in PHPFox?

Here is a general outline of how to implement token-based authentication in PHPFox:

1. Create a login endpoint for users to submit their credentials.
2. Verify the credentials and, if valid, generate a JSON Web Token (JWT) that contains the user's information.
3. Send the JWT to the client, who should store it in a secure way (e.g. in an HTTP-only, secure cookie).
4. On subsequent requests, the client should include the JWT in the Authorization header of the request.
5. The server should validate the JWT by checking its signature and expiration time. If the JWT is valid, allow the user to access the requested resource.

It's important to use a secure method for storing the JWT on the client side, such as an HTTP-only, secure cookie. Also, you should store the secret key used to sign the JWT securely on the server side, preferably in environment variables. Additionally, it is recommended to validate the token on every request, check the expiration time, and implement a token refresh strategy to handle expiration securely.

You can use a library such as firebase/php-jwt to handle the JWT generation and validation in PHP. Below is a minimal example demonstrating the core logic, which can be adapted to a PHPFox controller or plugin hook:

use Firebase\JWT\JWT;
use Firebase\JWT\Key;

// Step 2: Generate JWT
$payload = [
    'sub' => $userId,
    'iat' => time(),
    'exp' => time() + 3600 // 1 hour
];
$jwt = JWT::encode($payload, $secretKey, 'HS256');

// Step 5: Validate JWT
try {
    $decoded = JWT::decode($jwt, new Key($secretKey, 'HS256'));
    // Token is valid, proceed with resource access
} catch (\Firebase\JWT\ExpiredException $e) {
    // Handle expiration, trigger refresh strategy
} catch (\Firebase\JWT\SignatureInvalidException $e) {
    // Handle invalid signature
}

Note that JWTs are stateless by design; if you need server-side persistence, use PHPFox's session management to store refresh tokens rather than the JWT itself.