/*
 * 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.oauth2.authentication.provider;

import jakarta.servlet.http.HttpServletRequest;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.dromara.dante.core.utils.ListUtils;
import org.dromara.dante.oauth2.authentication.utils.OAuth2EndpointUtils;
import org.dromara.dante.security.constant.OAuth2ErrorKeys;
import org.dromara.dante.web.exception.SessionInvalidException;
import org.dromara.dante.web.servlet.utils.SessionUtils;
import org.dromara.dante.web.support.crypto.DigitalEnvelopeProcessor;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;
import org.springframework.security.web.authentication.AuthenticationConverter;
import org.springframework.util.MultiValueMap;

import java.util.*;

/**
 * <p>Description: 抽象的认证 Converter </p>
 *
 * @author : gengwei.zheng
 * @date : 2023/6/21 6:23
 */
public abstract class AbstractAuthenticationConverter implements AuthenticationConverter {

    private final DigitalEnvelopeProcessor digitalEnvelopeProcessor;

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

    protected String[] decrypt(HttpServletRequest request, String sessionId, List<String> parameters) {
        if (SessionUtils.isCryptoEnabled(request, sessionId) && CollectionUtils.isNotEmpty(parameters)) {
            List<String> result = parameters.stream().map(item -> decrypt(request, sessionId, item)).toList();
            return ListUtils.toStringArray(result);
        }

        return ListUtils.toStringArray(parameters);
    }

    protected String decrypt(HttpServletRequest request, String sessionId, String parameter) {
        if (SessionUtils.isCryptoEnabled(request, sessionId) && StringUtils.isNotBlank(parameter)) {
            try {
                return digitalEnvelopeProcessor.decrypt(sessionId, parameter);
            } catch (SessionInvalidException e) {
                OAuth2EndpointUtils.throwError(
                        OAuth2ErrorKeys.SESSION_EXPIRED,
                        e.getMessage(),
                        OAuth2EndpointUtils.ACCESS_TOKEN_REQUEST_ERROR_URI);
            }
        }
        return parameter;
    }

    protected Authentication getClientPrincipal() {
        return SecurityContextHolder.getContext().getAuthentication();
    }

    protected Map<String, Object> getAdditionalParameters(HttpServletRequest request, MultiValueMap<String, String> parameters) {

        String sessionId = SessionUtils.analyseSessionId(request);

        Map<String, Object> additionalParameters = new HashMap<>();
        parameters.forEach((key, value) -> {
            if (!key.equals(OAuth2ParameterNames.GRANT_TYPE) &&
                    !key.equals(OAuth2ParameterNames.SCOPE)) {
                additionalParameters.put(key, (value.size() == 1) ? decrypt(request, sessionId, value.get(0)) : decrypt(request, sessionId, value));
            }
        });

        return additionalParameters;
    }

    protected Set<String> getRequestedScopes(String scope) {

        Set<String> requestedScopes = null;
        if (org.springframework.util.StringUtils.hasText(scope)) {
            requestedScopes = new HashSet<>(
                    Arrays.asList(org.springframework.util.StringUtils.delimitedListToStringArray(scope, " ")));
        }

        return requestedScopes;
    }
}
