/*
* 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 {}
}