141 lines
4.6 KiB
Java
141 lines
4.6 KiB
Java
import java.util.Scanner;
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public class Authentification {
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private Node root;
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// Ajouter un utilisateur
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public void addUser(String username, String password) {
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root = addUserRec(root, username, password);
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System.out.println("Utilisateur \"" + username + "\" ajouté");
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}
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private Node addUserRec(Node node, String username, String password) {
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if (node == null) {
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return new Node(username, password);
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}
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if (username.compareTo(node.username) < 0) {
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node.left = addUserRec(node.left, username, password);
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} else if (username.compareTo(node.username) > 0) {
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node.right = addUserRec(node.right, username, password);
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} else {
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node.password = password; // Mise à jour du mot de passe si utilisateur existe
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}
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return node;
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}
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// Supprimer un utilisateur
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public void removeUser(String username) {
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root = removeUserRec(root, username);
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}
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private Node removeUserRec(Node node, String username) {
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if (node == null) {
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System.out.println("Utilisateur \"" + username + "\" non trouvé.");
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return null;
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}
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if (username.compareTo(node.username) < 0) {
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node.left = removeUserRec(node.left, username);
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} else if (username.compareTo(node.username) > 0) {
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node.right = removeUserRec(node.right, username);
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} else {
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// Cas où l'utilisateur est trouvé
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if (node.left == null){
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System.out.println("Utilisateur \"" + username + "\" retiré");
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return node.right;
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}
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if (node.right == null){
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System.out.println("Utilisateur \"" + username + "\" retiré");
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return node.left;
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}
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// Remplacer par le successeur in-order
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Node minNode = findMin(node.right);
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node.username = minNode.username;
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node.password = minNode.password;
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node.right = removeUserRec(node.right, minNode.username);
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}
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System.out.println("Utilisateur \"" + username + "\" retiré");
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return node;
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}
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private Node findMin(Node node) {
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while (node.left != null) {
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node = node.left;
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}
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return node;
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}
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// Authentification d’un utilisateur
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public void authenticate(String username, String password) {
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Node user = findUser(root, username);
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if (user != null && user.password.equals(password)) {
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System.out.println("Utilisateur \"" + username + "\" reconnu");
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} else {
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System.out.println("Utilisateur \"" + username + "\" non reconnu");
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}
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}
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private Node findUser(Node node, String username) {
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if (node == null){
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return null;
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}
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if (username.equals(node.username)){
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return node;
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}
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if (username.compareTo(node.username) < 0) {
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return findUser(node.left, username);
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}
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return findUser(node.right, username);
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}
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// Main pour le test
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public static void main(String[] args) {
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Authentification auth = new Authentification();
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Scanner scanner = new Scanner(System.in);
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while (true) {
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System.out.print("> ");
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String command = scanner.nextLine();
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String[] parts = command.split(" ");
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if (parts.length == 0) continue;
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switch (parts[0].toLowerCase()) {
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case "add":
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if (parts.length == 3) {
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auth.addUser(parts[1], parts[2]);
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} else {
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System.out.println("Usage : add <username> <password>");
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}
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break;
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case "del":
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if (parts.length == 2) {
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auth.removeUser(parts[1]);
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} else {
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System.out.println("Usage : del <username>");
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}
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break;
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case "auth":
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if (parts.length == 3) {
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auth.authenticate(parts[1], parts[2]);
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} else {
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System.out.println("Usage : auth <username> <password>");
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}
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break;
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case "quit":
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System.out.println("Au revoir");
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scanner.close();
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return;
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default:
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System.out.println("Commande non reconnue.");
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}
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}
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}
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}
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