/*
 * 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 jakarta.servlet.http.HttpServletRequest;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
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.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.annotation.RequestParamMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
import org.springframework.web.multipart.MultipartRequest;

import java.util.ArrayList;
import java.util.List;

/**
 * <p>Description: @RequestParam 解密处理器 </p>
 *
 * @author : gengwei.zheng
 * @date : 2021/10/10 12:17
 */
public class DecryptRequestParamResolver implements HandlerMethodArgumentResolver {

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

    private final DigitalEnvelopeProcessor digitalEnvelopeProcessor;
    private RequestParamMethodArgumentResolver requestParamMethodArgumentResolver;

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

    public void setRequestParamMethodArgumentResolver(RequestParamMethodArgumentResolver requestParamMethodArgumentResolver) {
        this.requestParamMethodArgumentResolver = requestParamMethodArgumentResolver;
    }

    @Override
    public boolean supportsParameter(MethodParameter methodParameter) {
        String methodName = methodParameter.getMethod().getName();
        boolean isSupports = isConfigCrypto(methodParameter) && requestParamMethodArgumentResolver.supportsParameter(methodParameter);

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

    /**
     * 判断该接口方法是否用@Crypto注解标记，同时requestDecrypt的值是true
     *
     * @param methodParameter {@link MethodParameter}
     * @return 是否开启了自定义@Crypto
     */
    private boolean isConfigCrypto(MethodParameter methodParameter) {
        Crypto crypto = methodParameter.getMethodAnnotation(Crypto.class);
        return ObjectUtils.isNotEmpty(crypto) && crypto.requestDecrypt();
    }

    /**
     * 是否是常规的请求
     *
     * @param webRequest {@link NativeWebRequest}
     * @return boolean
     */
    private boolean isRegularRequest(NativeWebRequest webRequest) {
        MultipartRequest multipartRequest = webRequest.getNativeRequest(MultipartRequest.class);
        return ObjectUtils.isEmpty(multipartRequest);
    }

    private String[] decrypt(String sessionId, String[] paramValues) throws SessionInvalidException {
        List<String> values = new ArrayList<>();
        for (String paramValue : paramValues) {
            String value = digitalEnvelopeProcessor.decrypt(sessionId, paramValue);
            if (StringUtils.isNotBlank(value)) {
                values.add(value);
            }
        }

        String[] result = new String[values.size()];
        return values.toArray(result);
    }

    @Override
    public @Nullable Object resolveArgument(MethodParameter methodParameter, @Nullable ModelAndViewContainer mavContainer, NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {

        if (isRegularRequest(webRequest)) {

            HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);

            String sessionId = SessionUtils.analyseSessionId(request);
            if (SessionUtils.isCryptoEnabled(request, sessionId)) {
                String[] paramValues = request.getParameterValues(methodParameter.getParameterName());
                if (ArrayUtils.isNotEmpty(paramValues)) {
                    String[] values = decrypt(sessionId, paramValues);
                    return (values.length == 1 ? values[0] : values);
                }
            } else {
                log.warn("[Herodotus] |- Cannot find Herodotus Cloud custom session header. Use interface crypto founction need add X_HERODOTUS_SESSION_ID to request header.");
            }
        }

        log.debug("[Herodotus] |- The decryption conditions are not met DecryptRequestParamResolver, skip! to next!");
        return requestParamMethodArgumentResolver.resolveArgument(methodParameter, mavContainer, webRequest, binderFactory);
    }
}
