/*
 * 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.webmvc.autoconfigure.crypto;

import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.dromara.dante.core.jackson.JacksonUtils;
import org.dromara.dante.web.support.crypto.DigitalEnvelopeProcessor;
import org.dromara.dante.web.annotation.Crypto;
import org.dromara.dante.web.exception.SessionInvalidException;
import org.dromara.dante.web.servlet.utils.SessionUtils;
import org.jspecify.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
import tools.jackson.core.JacksonException;

/**
 * <p>Description: 响应体加密Advice </p>
 *
 * @author : gengwei.zheng
 * @date : 2021/10/4 14:30
 */
@RestControllerAdvice
public class EncryptResponseBodyAdvice implements ResponseBodyAdvice<Object> {

    private static final Logger log = LoggerFactory.getLogger(EncryptResponseBodyAdvice.class);

    private final DigitalEnvelopeProcessor digitalEnvelopeProcessor;

    public EncryptResponseBodyAdvice(DigitalEnvelopeProcessor digitalEnvelopeProcessor) {
        this.digitalEnvelopeProcessor = digitalEnvelopeProcessor;
    }

    @Override
    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> converterType) {

        String methodName = methodParameter.getMethod().getName();
        Crypto crypto = methodParameter.getMethodAnnotation(Crypto.class);

        boolean isSupports = ObjectUtils.isNotEmpty(crypto) && crypto.responseEncrypt();

        log.trace("[Herodotus] |- Is EncryptResponseBodyAdvice supports method [{}] ? Status is [{}].", methodName, isSupports);
        return isSupports;
    }

    @Override
    public @Nullable Object beforeBodyWrite(@Nullable Object body, MethodParameter methodParameter, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {

        String sessionId = SessionUtils.analyseSessionId(request);
        if (SessionUtils.isCryptoEnabled(request, sessionId)) {

            log.info("[Herodotus] |- EncryptResponseBodyAdvice begin encrypt data.");

            String methodName = methodParameter.getMethod().getName();
            String className = methodParameter.getDeclaringClass().getName();

            try {
                String bodyString = JacksonUtils.getObjectMapper().writerWithDefaultPrettyPrinter().writeValueAsString(body);
                String result = digitalEnvelopeProcessor.encrypt(sessionId, bodyString);
                if (StringUtils.isNotBlank(result)) {
                    log.debug("[Herodotus] |- Encrypt response body for rest method [{}] in [{}] finished.", methodName, className);
                    return result;
                } else {
                    return body;
                }
            } catch (JacksonException e) {
                log.debug("[Herodotus] |- Encrypt response body for rest method [{}] in [{}] catch error, skip encrypt operation.", methodName, className, e);
                return body;
            } catch (SessionInvalidException e) {
                log.error("[Herodotus] |- Session is expired for encrypt response body for rest method [{}] in [{}], skip encrypt operation.", methodName, className, e);
                return body;
            }
        } else {
            log.warn("[Herodotus] |- Cannot find Herodotus Cloud custom session header. Use interface crypto function need add X_HERODOTUS_SESSION_ID to request header.");
            return body;
        }
    }
}
