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Server-side library used by applications created with the JHipster generator, see https://www.jhipster.tech/ for more information on JHipster

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/*
 * Copyright 2016-2020 the original author or authors from the JHipster project.
 *
 * This file is part of the JHipster project, see https://www.jhipster.tech/
 * for more information.
 *
 * Licensed 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 io.github.jhipster.security;

import org.apache.commons.lang3.RandomStringUtils;

import java.security.SecureRandom;

/**
 * Utility class for generating random Strings.
 */
public final class RandomUtil {

    private static final int DEF_COUNT = 20;

    private static final SecureRandom SECURE_RANDOM;

    static {
        SECURE_RANDOM = new SecureRandom();
        SECURE_RANDOM.nextBytes(new byte[64]);
    }

    private RandomUtil() {
    }

    public static String generateRandomAlphanumericString() {
        return RandomStringUtils.random(DEF_COUNT, 0, 0, true, true, null, SECURE_RANDOM);
    }

    /**
     * Generate a password.
     *
     * @return the generated password.
     */
    public static String generatePassword() {
        return generateRandomAlphanumericString();
    }

    /**
     * Generate an activation key.
     *
     * @return the generated activation key.
     */
    public static String generateActivationKey() {
        return generateRandomAlphanumericString();
    }

    /**
     * Generate a reset key.
     *
     * @return the generated reset key.
     */
    public static String generateResetKey() {
        return generateRandomAlphanumericString();
    }
}