Function generate_access_token 

pub fn generate_access_token(
    user_id: &str,
    username: &str,
) -> Result<String, Box<dyn Error>>

Generates a new access token for a user.

Creates a JWT access token with the user’s ID and username. The token is signed using the configured JWT_SECRET and expires after JWT_ACCESS_MINUTES minutes. Access tokens are short-lived and used for API request authentication.

Arguments

• user_id - The unique identifier of the user.
• username - The username of the user.

Returns

• Ok(String) - The encoded JWT token string.
• Err(Box<dyn Error>) - If token encoding fails or config is not initialized.

Errors

Returns an error if:

• JWT encoding fails (invalid secret or configuration)
• The configured JWT secret is missing or invalid
• Config has not been initialized via Config::load()

Example

use crate::utility::jwt;

let token = jwt::generate_access_token("user123", "john_doe")
    .expect("Failed to generate token");
println!("Access token: {}", token);