ACS : Only keep one token per card number

src/main/java/acs/acs/src/Main.java

@@ -103,7 +103,7 @@ public class Main {
             Logger.displayInfo("Détails de la carte OK");
 
             PrivateKey privateKey = CryptoUtils.getPrivateKey(KEY_STORE_PATH, KEY_STORE_PWD, "acs");
-            String token = tokenManager.generateAndStoreToken();
+            String token = tokenManager.generateAndStoreTokenFor(creditCard.number());
             String signedToken = CryptoUtils.signData(privateKey, token);
 
             Map<String, Object> data = Map.of("token", token, "signature", signedToken);

src/main/java/acs/acs/src/TokenManager.java

@@ -2,18 +2,19 @@ package acs.acs.src;
 
 import common.common.src.crypto.CryptoUtils;
 
-import java.util.HashSet;
+import java.util.HashMap;
+import java.util.Map;
 
 public class TokenManager {
-    private final HashSet<String> tokens = new HashSet<String>();
+    private final Map<String, String> tokens = new HashMap<String, String>();
 
-    public String generateAndStoreToken() {
+    public String generateAndStoreTokenFor(String cardNumber) {
         String token = CryptoUtils.generateToken();
-        tokens.add(token);
+        tokens.put(cardNumber, token);
         return token;
     }
 
     public boolean isValidToken(String token) {
-        return tokens.contains(token);
+        return tokens.containsValue(token);
     }
 }