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package com.iailab.module.data.framework.filter;
 
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
 
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Objects;
import java.util.Optional;
 
@Component
@WebFilter(filterName = "RewriteRequestFilter", urlPatterns = "/*")
@Order(1)
public class RewriteRequestFilter implements Filter {
 
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        //文件上传类型 不需要处理，否则会报java.nio.charset.MalformedInputException: Input length = 1异常
        if (Objects.isNull(request) || Optional.ofNullable(request.getContentType()).orElse(StringUtils.EMPTY).startsWith("multipart/")) {
            chain.doFilter(request, response);
            return;
        }
        //自定义wrapper 处理流，必须在过滤器中处理，然后通过FilterChain传下去， 否则重写后的getInputStream（）方法不会被调用
        MyHttpServletRequestWrapper requestWrapper = new MyHttpServletRequestWrapper((HttpServletRequest)request);
        chain.doFilter(requestWrapper,response);
    }
}