com.epam.reportportal.gateway.UrlRewriteConfiguration.java Source code

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Here is the source code for com.epam.reportportal.gateway.UrlRewriteConfiguration.java

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/*
 * Copyright 2016 EPAM Systems
 * 
 * 
 * This file is part of EPAM Report Portal.
 * https://github.com/reportportal/service-gateway
 * 
 * Report Portal is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Report Portal is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Report Portal.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.epam.reportportal.gateway;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.cloud.netflix.zuul.filters.ZuulProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Optional;

/**
 * URL rewriting configuration
 * ZUUL+Spring has performance issues with Multipart requests.
 * Multipart request should be router directly to ZUUL servlet, so this filter routes some specific request directly to ZUUL
 *
 * @author Andrei Varabyeu
 */
@Configuration
public class UrlRewriteConfiguration {

    @Autowired
    private ZuulProperties zuulProperties;

    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new ZuulMiltipartRewriteFilter(zuulProperties.getServletPath()));
        registrationBean.addUrlPatterns("/*");

        /* should be the first one in the filter chain */
        registrationBean.setOrder(Integer.MIN_VALUE);
        return registrationBean;
    }

    private static class ZuulMiltipartRewriteFilter implements Filter {

        private final String zuulServlet;

        ZuulMiltipartRewriteFilter(String zuulServlet) {
            this.zuulServlet = zuulServlet;
        }

        @Override
        public void init(FilterConfig filterConfig) throws ServletException {

        }

        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {
            HttpServletRequest rq = (HttpServletRequest) request;

            Optional<MediaType> contentType = Optional.ofNullable(rq.getHeader(HttpHeaders.CONTENT_TYPE))
                    .map(MediaType::parseMediaType);

            /* if request doesn't go to zuul and has multipart content type*/
            //noinspection OptionalGetWithoutIsPresent
            if (!rq.getRequestURI().startsWith(zuulServlet) && contentType.isPresent()
                    && contentType.get().isCompatibleWith(MediaType.MULTIPART_FORM_DATA)) {
                rq.getRequestDispatcher(zuulServlet + rq.getRequestURI()).forward(rq, response);

            } else {
                chain.doFilter(request, response);
            }

        }

        @Override
        public void destroy() {

        }
    }

}