implement check for existing special character in password

src/main/java/PasswordValidator.java

@@ -11,11 +11,13 @@ public class PasswordValidator {
     boolean requireUppercase = true;
     boolean requireLowercase = true;
     boolean requireDigit = true;
+    boolean requireSpecialChar = true;
     boolean checkPwned = true;
 
     private final Pattern uppercasePattern = Pattern.compile("^(?=.*[A-Z]).+$");
     private final Pattern lowercasePattern = Pattern.compile("^(?=.*[a-z]).+$");
     private final Pattern digitPattern = Pattern.compile("^(?=.*\\d).+$");
+    private final Pattern specialCharPattern = Pattern.compile("^(?=.*[.!?=@#$()%^&/*_\\-+]).+$");
     private static final String pwnedPasswordsApiUrl = "https://api.pwnedpasswords.com/range/";
 
     public boolean validate(String password) {
@@ -27,6 +29,8 @@ public class PasswordValidator {
             return false;
         } else if (requireDigit && !digitPattern.matcher(password).matches()) {
             return false;
+        } else if (requireSpecialChar && !specialCharPattern.matcher(password).matches()) {
+            return false;
         } else if (checkPwned && isPwned(password)) {
             return false;
         }
@@ -65,6 +69,14 @@ public class PasswordValidator {
         this.requireDigit = requireDigit;
     }
 
+    public boolean isRequireSpecialChar() {
+        return requireSpecialChar;
+    }
+
+    public void setRequireSpecialChar(boolean requireSpecialChar) {
+        this.requireSpecialChar = requireSpecialChar;
+    }
+
     public boolean isCheckPwned() {
         return checkPwned;
     }

src/test/java/PasswordValidatorTest.java

@@ -15,6 +15,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireLowercase(false);
         passwordValidator.setRequireDigit(false);
         passwordValidator.setCheckPwned(false);
+        passwordValidator.setRequireSpecialChar(false);
         assertFalse(passwordValidator.validate("abcde"));
         assertTrue(passwordValidator.validate("abcdef"));
         assertTrue(passwordValidator.validate("abcdefg"));
@@ -24,6 +25,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireLowercase(false);
         passwordValidator.setRequireDigit(false);
         passwordValidator.setCheckPwned(false);
+        passwordValidator.setRequireSpecialChar(false);
         assertFalse(passwordValidator.validate("abcdef"));
         assertTrue(passwordValidator.validate("abCdef"));
         assertTrue(passwordValidator.validate("ABCDEF"));
@@ -33,6 +35,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireLowercase(true);
         passwordValidator.setRequireDigit(false);
         passwordValidator.setCheckPwned(false);
+        passwordValidator.setRequireSpecialChar(false);
         assertFalse(passwordValidator.validate("abcdef"));
         assertTrue(passwordValidator.validate("abCdef"));
         assertFalse(passwordValidator.validate("ABCDEF"));
@@ -42,6 +45,7 @@ class PasswordValidatorTest {
         passwordValidator.setRequireLowercase(true);
         passwordValidator.setRequireDigit(true);
         passwordValidator.setCheckPwned(false);
+        passwordValidator.setRequireSpecialChar(false);
         assertFalse(passwordValidator.validate("8"));
         assertFalse(passwordValidator.validate("12345678"));
         assertFalse(passwordValidator.validate("abcdef"));
@@ -51,6 +55,17 @@ class PasswordValidatorTest {
         assertFalse(passwordValidator.validate("ABCDEF8"));
         assertTrue(passwordValidator.validate("abCDE8F"));
 
+        // test special chars requirement
+        passwordValidator.setRequireUppercase(true);
+        passwordValidator.setRequireLowercase(true);
+        passwordValidator.setRequireDigit(true);
+        passwordValidator.setCheckPwned(false);
+        passwordValidator.setRequireSpecialChar(true);
+        assertFalse(passwordValidator.validate("*"));
+        assertFalse(passwordValidator.validate("abCDE8F"));
+        assertTrue(passwordValidator.validate("abCDE8_F"));
+        assertTrue(passwordValidator.validate("abCDE*/8_F"));
+
         // test password pwned check
         passwordValidator.setRequireUppercase(true);
         passwordValidator.setRequireLowercase(true);