/*
 * Copyright (c) 2011-2023, baomidou (jobob@qq.com).
 *
 * 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 com.baomidou.mybatisplus.autoconfigure;

import com.baomidou.mybatisplus.core.toolkit.AES;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.boot.env.OriginTrackedMapPropertySource;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.SimpleCommandLinePropertySource;

import java.util.HashMap;

/**
 * 安全加密处理器
 *
 * @author hubin
 * @since 2020-05-23
 */
public class SafetyEncryptProcessor implements EnvironmentPostProcessor {

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        /**
         * 命令行中获取密钥
         */
        String mpwKey = null;
        for (PropertySource<?> ps : environment.getPropertySources()) {
            if (ps instanceof SimpleCommandLinePropertySource) {
                SimpleCommandLinePropertySource source = (SimpleCommandLinePropertySource) ps;
                mpwKey = source.getProperty("mpw.key");
                break;
            }
        }
        /**
         * 处理加密内容
         */
        if (StringUtils.isNotBlank(mpwKey)) {
            HashMap<String, Object> map = new HashMap<>();
            for (PropertySource<?> ps : environment.getPropertySources()) {
                if (ps instanceof OriginTrackedMapPropertySource) {
                    OriginTrackedMapPropertySource source = (OriginTrackedMapPropertySource) ps;
                    for (String name : source.getPropertyNames()) {
                        Object value = source.getProperty(name);
                        if (value instanceof String) {
                            String str = (String) value;
                            if (str.startsWith("mpw:")) {
                                map.put(name, AES.decrypt(str.substring(4), mpwKey));
                            }
                        }
                    }
                }
            }
            // 将解密的数据放入环境变量，并处于第一优先级上
            if (CollectionUtils.isNotEmpty(map)) {
                environment.getPropertySources().addFirst(new MapPropertySource("custom-encrypt", map));
            }
        }
    }
}
