com.qwazr.webapps.exception.WebappException Maven / Gradle / Ivy
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/*
* Copyright 2015-2017 Emmanuel Keller / QWAZR
*
* 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.qwazr.webapps.exception;
import com.jamesmurty.utils.XMLBuilder2;
import com.qwazr.utils.LoggerUtils;
import com.qwazr.utils.ObjectMappers;
import org.apache.commons.text.StringEscapeUtils;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.core.Response.Status;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
public class WebappException extends AbstractWebappException {
/**
*
*/
private static final long serialVersionUID = -1221758741584043195L;
private static final Logger logger = LoggerUtils.getLogger(WebappException.class);
public enum Title {
ERROR, SCRIPT_ERROR, QUERY_ERROR, VIEW_ERROR, BODY_ERROR, NOT_FOUND_ERROR;
private String title = name().replace('_', ' ');
}
public static class Error {
public final int status;
public final Title title;
public final String message;
private Error(Status status, Title title, String message) {
this.status = status.getStatusCode();
this.title = title == null ? Title.ERROR : title;
this.message = message == null ? status.getReasonPhrase() : message;
}
}
private final Error error;
public WebappException(Status status, Title title, String message) {
error = new Error(status, title, message);
}
public WebappException(Status status) {
this(status, null, (String) null);
}
public WebappException(Status status, Title title, Throwable e) {
this(status, title, e == null ? null : e.getMessage());
}
private void sendQuietlyHTML(final HttpServletResponse response) throws IOException {
PrintWriter printWriter = null;
try {
try {
printWriter = response.getWriter();
} catch (IllegalStateException e) {
printWriter = new PrintWriter(response.getOutputStream());
}
String message = StringEscapeUtils.escapeHtml4(error.message);
response.setStatus(error.status);
response.setContentType("text/html");
printWriter.print("
");
printWriter.print(error.title.title);
printWriter.println(" ");
printWriter.print("");
printWriter.print(error.title.title);
printWriter.println("
");
printWriter.print("");
printWriter.print(message);
printWriter.println("");
} finally {
if (printWriter != null)
printWriter.close();
}
}
private void sendQuietlyXML(final HttpServletResponse response) throws IOException {
XMLBuilder2 xml = XMLBuilder2.create("error").a("code", Integer.toString(error.status));
if (error.title != null)
xml.e("title").t(error.title.title).up();
if (error.message != null)
xml.e("message").t(error.message).up();
xml.toWriter(true, response.getWriter(), null);
}
private void sendQuietlyJSON(final HttpServletResponse response) throws IOException {
ObjectMappers.JSON.writeValue(response.getWriter(), error);
}
@Override
public void sendQuietly(final HttpServletResponse response) {
try {
String contentType = response.getContentType();
response.setStatus(error.status);
if (contentType != null) {
if (contentType.startsWith("application/xml")) {
sendQuietlyXML(response);
return;
} else if (contentType.startsWith("application/json")) {
sendQuietlyJSON(response);
return;
}
}
sendQuietlyHTML(response);
} catch (IOException e) {
logger.log(Level.WARNING, e, e::getMessage);
}
}
}