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/*
 *      Copyright (c) 2018-2028, Chill Zhuang All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *  Neither the name of the dreamlu.net developer nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 *  Author: Chill 庄骞 (smallchill@163.com)
 */
package org.springblade.core.boot.request;
 
import org.springblade.core.tool.utils.WebUtil;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
 
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
 
/**
 * 全局Request包装
 *
 * @author Chill
 */
public class BladeHttpServletRequestWrapper extends HttpServletRequestWrapper {
 
    /**
     * 没被包装过的HttpServletRequest（特殊场景,需要自己过滤）
     */
    private final HttpServletRequest orgRequest;
    /**
     * 缓存报文,支持多次读取流
     */
    private byte[] body;
 
 
    public BladeHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        orgRequest = request;
    }
 
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }
 
    @Override
    public ServletInputStream getInputStream() throws IOException {
        if (super.getHeader(HttpHeaders.CONTENT_TYPE) == null) {
            return super.getInputStream();
        }
 
        if (super.getHeader(HttpHeaders.CONTENT_TYPE).startsWith(MediaType.MULTIPART_FORM_DATA_VALUE)) {
            return super.getInputStream();
        }
 
        if (body == null) {
            body = WebUtil.getRequestBody(super.getInputStream()).getBytes();
        }
 
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body);
 
        return new ServletInputStream() {
 
            @Override
            public int read() {
                return byteArrayInputStream.read();
            }
 
            @Override
            public boolean isFinished() {
                return false;
            }
 
            @Override
            public boolean isReady() {
                return false;
            }
 
            @Override
            public void setReadListener(ReadListener readListener) {
            }
        };
    }
 
    /**
     * 获取初始request
     *
     * @return HttpServletRequest
     */
    public HttpServletRequest getOrgRequest() {
        return orgRequest;
    }
 
    /**
     * 获取初始request
     *
     * @param request request
     * @return HttpServletRequest
     */
    public static HttpServletRequest getOrgRequest(HttpServletRequest request) {
        if (request instanceof BladeHttpServletRequestWrapper) {
            return ((BladeHttpServletRequestWrapper) request).getOrgRequest();
        }
        return request;
    }
 
}