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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 com.google.common.flogger.FluentLogger;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

/**
 * HttpServletResponse wrapper to allow response status code override.
 *
 * 

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 FluentLogger logger = FluentLogger.forEnclosingClass(); private static final String LOCATION_HEADER = "Location"; private int status; private String statusMsg = ""; private Map 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", "MissingOverride"}) // @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) { logger.atFine().log("Replaying %s %s", status, statusMsg); if (status == SC_MOVED_TEMPORARILY) { super.sendRedirect(headers.get(LOCATION_HEADER)); } else { super.sendError(status, statusMsg); } } } }





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