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// Copyright (C) 2013 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.pgm.http.jetty;
import static java.nio.charset.StandardCharsets.ISO_8859_1;
import com.google.common.base.Strings;
import com.google.gwtexpui.server.CacheHeaders;
import java.io.IOException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.server.HttpConnection;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.ErrorHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class HiddenErrorHandler extends ErrorHandler {
private static final Logger log = LoggerFactory.getLogger(HiddenErrorHandler.class);
@Override
public void handle(
String target, Request baseRequest, HttpServletRequest req, HttpServletResponse res)
throws IOException {
HttpConnection conn = HttpConnection.getCurrentConnection();
baseRequest.setHandled(true);
try {
log(req);
} finally {
reply(conn, res);
}
}
private void reply(HttpConnection conn, HttpServletResponse res) throws IOException {
byte[] msg = message(conn);
res.setHeader(HttpHeader.CONTENT_TYPE.asString(), "text/plain; charset=ISO-8859-1");
res.setContentLength(msg.length);
try {
CacheHeaders.setNotCacheable(res);
} finally {
try (ServletOutputStream out = res.getOutputStream()) {
out.write(msg);
}
}
}
private static byte[] message(HttpConnection conn) {
String msg;
if (conn == null) {
msg = "";
} else {
msg = conn.getHttpChannel().getResponse().getReason();
if (msg == null) {
msg = HttpStatus.getMessage(conn.getHttpChannel().getResponse().getStatus());
}
}
return msg.getBytes(ISO_8859_1);
}
private static void log(HttpServletRequest req) {
Throwable err = (Throwable) req.getAttribute("javax.servlet.error.exception");
if (err != null) {
String uri = req.getRequestURI();
if (!Strings.isNullOrEmpty(req.getQueryString())) {
uri += "?" + req.getQueryString();
}
log.error("Error in {} {}", req.getMethod(), uri, err);
}
}
}
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