/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.zeppelin.server; import org.apache.zeppelin.conf.ZeppelinConfiguration; import org.apache.zeppelin.utils.SecurityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.net.URISyntaxException; import java.text.DateFormat; import java.util.Date; import java.util.Locale; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Cors filter * */ public class CorsFilter implements Filter { private static final Logger LOGGER = LoggerFactory.getLogger(CorsFilter.class); @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException { String sourceHost = ((HttpServletRequest) request).getHeader("Origin"); String origin = ""; try { if (SecurityUtils.isValidOrigin(sourceHost, ZeppelinConfiguration.create())) { origin = sourceHost; } } catch (URISyntaxException e) { LOGGER.error("Exception in WebDriverManager while getWebDriver ", e); } if (((HttpServletRequest) request).getMethod().equals("OPTIONS")) { HttpServletResponse resp = ((HttpServletResponse) response); addCorsHeaders(resp, origin); return; } if (response instanceof HttpServletResponse) { HttpServletResponse alteredResponse = ((HttpServletResponse) response); addCorsHeaders(alteredResponse, origin); } filterChain.doFilter(request, response); } private void addCorsHeaders(HttpServletResponse response, String origin) { response.addHeader("Access-Control-Allow-Origin", origin); response.addHeader("Access-Control-Allow-Credentials", "true"); response.addHeader("Access-Control-Allow-Headers", "authorization,Content-Type"); response.addHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, HEAD, DELETE"); DateFormat fullDateFormatEN = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL, new Locale("EN", "en")); response.addHeader("Date", fullDateFormatEN.format(new Date())); } @Override public void destroy() {} @Override public void init(FilterConfig filterConfig) throws ServletException {} }