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/*******************************************************************************
* ============LICENSE_START=======================================================
* org.onap.dmaap
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*
*******************************************************************************/
package org.onap.dmaap.mr.filter;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import org.apache.http.HttpStatus;
import org.json.JSONObject;
import org.onap.dmaap.dmf.mr.CambriaApiException;
import org.onap.dmaap.dmf.mr.exception.DMaaPErrorMessages;
import org.onap.dmaap.dmf.mr.exception.DMaaPResponseCode;
import org.onap.dmaap.dmf.mr.exception.ErrorResponse;
import org.onap.dmaap.mr.filter.DefaultLength;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
/**
* Servlet Filter implementation class ContentLengthFilter
*/
public class ContentLengthFilter implements Filter {
private DefaultLength defaultLength;
private FilterConfig filterConfig = null;
DMaaPErrorMessages errorMessages = null;
private static final EELFLogger log = EELFManager.getInstance().getLogger(org.onap.dmaap.mr.filter.ContentLengthFilter.class);
/**
* Default constructor.
*/
public ContentLengthFilter() {
// TODO Auto-generated constructor stub
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException,
ServletException {
log.info("inside servlet do filter content length checking before pub/sub");
HttpServletRequest request = (HttpServletRequest) req;
JSONObject jsonObj = null;
int requestLength = 0;
try {
// retrieving content length from message header
if (null != request.getHeader("Content-Length")) {
requestLength = Integer.parseInt(request.getHeader("Content-Length"));
}
// retrieving encoding from message header
String transferEncoding = request.getHeader("Transfer-Encoding");
// checking for no encoding, chunked and requestLength greater then
// default length
if (null != transferEncoding && !(transferEncoding.contains("chunked"))
&& (requestLength > Integer.parseInt(defaultLength.getDefaultLength()))) {
jsonObj = new JSONObject().append("defaultlength", defaultLength)
.append("requestlength", requestLength);
log.error("message length is greater than default");
throw new CambriaApiException(jsonObj);
} else if (null == transferEncoding && (requestLength > Integer.parseInt(defaultLength.getDefaultLength()))) {
jsonObj = new JSONObject().append("defaultlength", defaultLength.getDefaultLength()).append(
"requestlength", requestLength);
log.error("Request message is not chunked or request length is greater than default length");
throw new CambriaApiException(jsonObj);
} else {
chain.doFilter(req, res);
}
} catch (CambriaApiException | NumberFormatException e) {
log.error("message size is greater then default", e);
if (jsonObj != null) {
ErrorResponse errRes = new ErrorResponse(HttpStatus.SC_EXPECTATION_FAILED,
DMaaPResponseCode.MSG_SIZE_EXCEEDS_MSG_LIMIT.getResponseCode(),
errorMessages.getMsgSizeExceeds()
+ jsonObj.toString());
log.info(errRes.toString());
}
}
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
this.filterConfig = fConfig;
log.info("Filter Content Length Initialize");
ApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(fConfig
.getServletContext());
DefaultLength defLength = (DefaultLength) ctx.getBean("defLength");
DMaaPErrorMessages errMessages = (DMaaPErrorMessages) ctx.getBean("DMaaPErrorMessages");
this.errorMessages = errMessages;
this.defaultLength = defLength;
}
}
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