Java テクノロジー スタックにセキュリティと認証を実装するためのベスト プラクティス

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpsURLConnectionExample {

    public static void main(String[] args) throws Exception {
        URL url = new URL("https://www.example.com");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.connect();

        BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String line;
        StringBuilder response = new StringBuilder();

        while ((line = br.readLine()) != null) {
            response.append(line);
        }

        System.out.println("Response: " + response.toString());
    }
}

import java.util.ArrayList;
import java.util.List;

public class User {

    private String username;
    private String password;
    private List<String> roles;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
        this.roles = new ArrayList<>();
    }

    public void addRole(String role) {
        this.roles.add(role);
    }

    public boolean hasRole(String role) {
        return this.roles.contains(role);
    }
}

public class RBACExample {

    private List<User> users;

    public RBACExample() {
        this.users = new ArrayList<>();
    }

    public void addUser(User user) {
        this.users.add(user);
    }

    public User authenticate(String username, String password) {
        for (User user : users) {
            if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
                return user;
            }
        }
        return null;
    }

    public boolean authorize(User user, String role) {
        return user.hasRole(role);
    }

    public static void main(String[] args) {
        User user1 = new User("user1", "password1");
        User user2 = new User("user2", "password2");

        user1.addRole("admin");
        user2.addRole("user");

        RBACExample rbac = new RBACExample();
        rbac.addUser(user1);
        rbac.addUser(user2);

        User authenticatedUser = rbac.authenticate("user1", "password1");

        if (authenticatedUser != null && rbac.authorize(authenticatedUser, "admin")) {
            System.out.println("User has admin role.");
        } else {
            System.out.println("User does not have admin role.");
        }
    }
}