implement checking pwned password in password validator

src/main/java/PasswordValidator.java

@@ -11,6 +11,7 @@ public class PasswordValidator {
     boolean requireUppercase = true;
     boolean requireLowercase = true;
     boolean requireDigit = true;
+    boolean checkPwned = true;
 
     private final Pattern uppercasePattern = Pattern.compile("^(?=.*[A-Z]).+$");
     private final Pattern lowercasePattern = Pattern.compile("^(?=.*[a-z]).+$");
@@ -26,6 +27,8 @@ public class PasswordValidator {
             return false;
         } else if (requireDigit && !digitPattern.matcher(password).matches()) {
             return false;
+        } else if (checkPwned && isPwned(password)) {
+            return false;
         }
         return true;
     }
@@ -62,6 +65,14 @@ public class PasswordValidator {
         this.requireDigit = requireDigit;
     }
 
+    public boolean isCheckPwned() {
+        return checkPwned;
+    }
+
+    public void setCheckPwned(boolean checkPwned) {
+        this.checkPwned = checkPwned;
+    }
+
     public static String getSHA1Hash(String input) {
         if (input.length() > 0) {
             try {

src/test/java/PasswordValidatorTest.java

@@ -14,6 +14,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireUppercase(false);
         passwordValidator.setRequireLowercase(false);
         passwordValidator.setRequireDigit(false);
+        passwordValidator.setCheckPwned(false);
         assertFalse(passwordValidator.validate("abcde"));
         assertTrue(passwordValidator.validate("abcdef"));
         assertTrue(passwordValidator.validate("abcdefg"));
@@ -22,6 +23,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireUppercase(true);
         passwordValidator.setRequireLowercase(false);
         passwordValidator.setRequireDigit(false);
+        passwordValidator.setCheckPwned(false);
         assertFalse(passwordValidator.validate("abcdef"));
         assertTrue(passwordValidator.validate("abCdef"));
         assertTrue(passwordValidator.validate("ABCDEF"));
@@ -30,6 +32,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireUppercase(true);
         passwordValidator.setRequireLowercase(true);
         passwordValidator.setRequireDigit(false);
+        passwordValidator.setCheckPwned(false);
         assertFalse(passwordValidator.validate("abcdef"));
         assertTrue(passwordValidator.validate("abCdef"));
         assertFalse(passwordValidator.validate("ABCDEF"));
@@ -38,6 +41,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireUppercase(true);
         passwordValidator.setRequireLowercase(true);
         passwordValidator.setRequireDigit(true);
+        passwordValidator.setCheckPwned(false);
         assertFalse(passwordValidator.validate("8"));
         assertFalse(passwordValidator.validate("12345678"));
         assertFalse(passwordValidator.validate("abcdef"));
@@ -46,6 +50,15 @@ class PasswordValidatorTest {
         assertFalse(passwordValidator.validate("ABCDEF"));
         assertFalse(passwordValidator.validate("ABCDEF8"));
         assertTrue(passwordValidator.validate("abCDE8F"));
+
+        // test password pwned check
+        passwordValidator.setRequireUppercase(true);
+        passwordValidator.setRequireLowercase(true);
+        passwordValidator.setRequireDigit(true);
+        passwordValidator.setCheckPwned(true);
+        assertFalse(passwordValidator.validate("8"));
+        assertFalse(passwordValidator.validate("asdf12"));
+        assertTrue(passwordValidator.validate("=phan0johB4aisae6Mie0jeip9Saejahc0iuvuth7ahv9uoni6o*_.+"));
     }
 
     @Test