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package com.terra.common.interceptor;
 
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
/**
 * 跨域过滤器
 * @author WWW
 * @date 2022-09-27
 */
public class CrosFilter implements Filter {
    private static final String OPTIONS = "OPTIONS";
 
    @Override
    public void init(FilterConfig filterConfig) {
        //
    }
 
    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        HttpServletRequest request = (HttpServletRequest) req;
        if (OPTIONS.equalsIgnoreCase(request.getMethod())) {
            response.setHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Allow-Credentials", "true");
            response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS");
            response.setHeader("Access-Control-Max-Age", "3600");
            response.setHeader("Access-Control-Allow-Headers", "*");
 
            response.setStatus(HttpServletResponse.SC_OK);
        } else {
            chain.doFilter(req, res);
        }
    }
 
    @Override
    public void destroy() {
        //
    }
}