/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */


package org.logstash.secret.password;

import java.util.Optional;

/**
 * A validator which check if given password appropriates symbol regex.
 */
public class SymbolValidator implements Validator {

    /**
     A regex for special character inclusion.
     */
    private static final String SYMBOL_REGEX = ".*[~!@#$%^&*()_+|<>?:{}].*";

    /**
     A policy failure reasoning if password does not contain special character(s).
     */
    private static final String SYMBOL_REASONING = "must contain at least one special character";

    @Override
    public Optional<String> validate(String password) {
        return password.matches(SYMBOL_REGEX)
                ? Optional.empty()
                : Optional.of(SYMBOL_REASONING);
    }
}
