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// Copyright (C) 2016 The Android Open Source Project
//
// 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.
package com.google.gerrit.httpd;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* HttpServletResponse wrapper to allow response status code override.
*
* <p>Differently from the normal HttpServletResponse, this class allows multiple filters to
* override the response http status code.
*/
public class HttpServletResponseRecorder extends HttpServletResponseWrapper {
private static final Logger log = LoggerFactory.getLogger(HttpServletResponseWrapper.class);
private static final String LOCATION_HEADER = "Location";
private int status;
private String statusMsg = "";
private Map<String, String> headers = new HashMap<>();
/**
* Constructs a response recorder wrapping the given response.
*
* @param response the response to be wrapped
*/
public HttpServletResponseRecorder(HttpServletResponse response) {
super(response);
}
@Override
public void sendError(int sc) throws IOException {
this.status = sc;
}
@Override
public void sendError(int sc, String msg) throws IOException {
this.status = sc;
this.statusMsg = msg;
}
@Override
public void sendRedirect(String location) throws IOException {
this.status = SC_MOVED_TEMPORARILY;
setHeader(LOCATION_HEADER, location);
}
@Override
public void setHeader(String name, String value) {
super.setHeader(name, value);
headers.put(name, value);
}
@SuppressWarnings("all")
// @Override is omitted for backwards compatibility with servlet-api 2.5
// TODO: Remove @SuppressWarnings and add @Override when Google upgrades
// to servlet-api 3.1
public int getStatus() {
return status;
}
void play() throws IOException {
if (status != 0) {
log.debug("Replaying {} {}", status, statusMsg);
if (status == SC_MOVED_TEMPORARILY) {
super.sendRedirect(headers.get(LOCATION_HEADER));
} else {
super.sendError(status, statusMsg);
}
}
}
}
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