/*
 * Copyright 2020-2030 码匠君<herodotus@aliyun.com>
 *
 * Dante Engine 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.
 *
 * Dante Engine 是 Dante Cloud 系统核心组件库，采用 APACHE LICENSE 2.0 开源协议，您在使用过程中，需要注意以下几点：
 *
 * 1. 请不要删除和修改根目录下的LICENSE文件。
 * 2. 请不要删除和修改 Dante Engine 源码头部的版权声明。
 * 3. 请保留源码和相关描述文件的项目出处，作者声明等。
 * 4. 分发源码时候，请注明软件出处 <https://gitee.com/dromara/dante-cloud>
 * 5. 在修改包名，模块名称，项目代码等时，请注明软件出处 <https://gitee.com/dromara/dante-cloud>
 * 6. 若您的项目无法满足以上几点，可申请商业授权
 */

package org.dromara.dante.rest.identity.service;

import org.apache.commons.lang3.ObjectUtils;
import org.dromara.dante.core.domain.SecretKey;
import org.dromara.dante.security.utils.SecurityUtils;
import org.dromara.dante.web.support.crypto.DigitalEnvelopeProcessor;
import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
import org.springframework.security.oauth2.core.OAuth2ErrorCodes;
import org.springframework.security.oauth2.server.authorization.client.RegisteredClient;
import org.springframework.security.oauth2.server.authorization.client.RegisteredClientRepository;
import org.springframework.stereotype.Service;

/**
 * <p>Description: 请求加密服务 </p>
 *
 * @author : gengwei.zheng
 * @date : 2021/9/30 18:08
 */
@Service
public class InterfaceSecurityService {

    private final DigitalEnvelopeProcessor digitalEnvelopeProcessor;
    private final RegisteredClientRepository registeredClientRepository;

    public InterfaceSecurityService(DigitalEnvelopeProcessor digitalEnvelopeProcessor, RegisteredClientRepository registeredClientRepository) {
        this.digitalEnvelopeProcessor = digitalEnvelopeProcessor;
        this.registeredClientRepository = registeredClientRepository;
    }

    /**
     * 检查终端是否是合法终端
     *
     * @param clientId     OAuth2 终端ID
     * @param clientSecret OAuth2 终端密码
     */
    private RegisteredClient validateClient(String clientId, String clientSecret) {
        RegisteredClient registeredClient = registeredClientRepository.findByClientId(clientId);

        boolean isMatch = false;
        if (ObjectUtils.isNotEmpty(registeredClient)) {
            isMatch = SecurityUtils.matches(clientSecret, registeredClient.getClientSecret());
        }

        if (!isMatch) {
            throw new OAuth2AuthenticationException(OAuth2ErrorCodes.INVALID_CLIENT);
        }

        return registeredClient;
    }

    public SecretKey createSecretKey(String clientId, String clientSecret, String sessionId) {
        // 检测终端是否是有效终端
        RegisteredClient registeredClient = this.validateClient(clientId, clientSecret);
        return digitalEnvelopeProcessor.createSecretKey(sessionId, registeredClient.getTokenSettings().getAccessTokenTimeToLive());
    }

    /**
     * 前端用后端PublicKey加密前端PublicKey后，将该值传递给后端，用于加密 AES KEY
     *
     * @param sessionId          Session 标识
     * @param confidentialBase64 前端用后端PublicKey加密前端PublicKey。前端使用node-rsa加密后的数据是base64编码
     * @return 前端RSA PublicKey 加密后的 AES Key
     */
    public String exchange(String sessionId, String confidentialBase64) {
        return digitalEnvelopeProcessor.exchange(sessionId, confidentialBase64);
    }
}
