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org.mycore.frontend.servlets.MCRErrorServlet Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see acceptHeader = req.getHeaders("Accept");
if (!acceptHeader.hasMoreElements()) {
return true;
}
while (acceptHeader.hasMoreElements()) {
String[] acceptValues = acceptHeader.nextElement().split(",");
for (String acceptValue : acceptValues) {
String[] parsed = acceptValue.split(";");
String mediaRange = parsed[0].trim();
if (mediaRange.startsWith("text/html") || mediaRange.startsWith("text/*")
|| mediaRange.startsWith("*/")) {
float quality = 1f; //default 'q=1.0'
for (int i = 1; i < parsed.length; i++) {
if (parsed[i].trim().startsWith("q=")) {
String qualityValue = parsed[i].trim().substring(2).trim();
quality = Float.parseFloat(qualityValue);
}
}
if (quality > 0.5) {
//firefox 18 accepts every media type when requesting images with 0.5
// but closes stream immediately when detecting text/html
return true;
}
}
}
}
return false;
}
private boolean setCurrentSession(HttpServletRequest req) {
MCRSession session = getMCRSession(req);
if (session != null && !MCRSessionMgr.hasCurrentSession()) {
MCRSessionMgr.setCurrentSession(session);
}
return session != null;
}
private MCRSession getMCRSession(HttpServletRequest req) {
HttpSession session = req.getSession(false);
if (session == null) {
return null;
}
return MCRServlet.getSession(req);
}
private void setWebAppBaseURL(MCRSession session, HttpServletRequest request) {
if (request.getAttribute(MCRFrontendUtil.BASE_URL_ATTRIBUTE) != null) {
session.put(MCRFrontendUtil.BASE_URL_ATTRIBUTE, request.getAttribute(MCRFrontendUtil.BASE_URL_ATTRIBUTE));
}
}
/**
* Builds a jdom document containing the error parameter.
*
* @param msg the message of the error
* @param statusCode the http status code
* @param requestURI the uri of the request
* @param exceptionType type of the exception
* @param source source of the error
* @param ex exception which is occured
*
* @return jdom document containing all error parameter
*/
public static Document buildErrorPage(String msg, Integer statusCode, String requestURI,
Class exceptionType, String source, Throwable ex) {
String rootname = MCRConfiguration2.getString("MCR.Frontend.ErrorPage").orElse("mcr_error");
Element root = new Element(rootname);
root.setAttribute("errorServlet", Boolean.TRUE.toString());
root.setAttribute("space", "preserve", Namespace.XML_NAMESPACE);
if (msg != null) {
root.setText(msg);
}
if (statusCode != null) {
root.setAttribute("HttpError", statusCode.toString());
}
if (requestURI != null) {
root.setAttribute("requestURI", requestURI);
}
if (exceptionType != null) {
root.setAttribute("exceptionType", exceptionType.getName());
}
if (source != null) {
root.setAttribute("source", source);
}
while (ex != null) {
Element exception = new Element("exception");
exception.setAttribute("type", ex.getClass().getName());
Element trace = new Element("trace");
Element message = new Element("message");
trace.setText(MCRException.getStackTraceAsString(ex));
message.setText(ex.getMessage());
exception.addContent(message).addContent(trace);
root.addContent(exception);
ex = ex.getCause();
}
return new Document(root, new DocType(rootname));
}
protected void generateErrorPage(HttpServletRequest request, HttpServletResponse response, String msg,
Throwable ex, Integer statusCode, Class exceptionType, String requestURI,
String servletName) throws IOException, TransformerException, SAXException {
boolean exceptionThrown = ex != null;
LOGGER.log(exceptionThrown ? Level.ERROR : Level.WARN, String.format(Locale.ENGLISH,
"%s: Error %d occured. The following message was given: %s", requestURI, statusCode, msg), ex);
String style = MCRFrontendUtil
.getProperty(request, "XSL.Style")
.filter("xml"::equals)
.orElse("default");
request.setAttribute("XSL.Style", style);
Document errorDoc = buildErrorPage(msg, statusCode, requestURI, exceptionType, servletName, ex);
final String requestAttr = "MCRErrorServlet.generateErrorPage";
if (!response.isCommitted() && request.getAttribute(requestAttr) == null) {
if (statusCode != null) {
response.setStatus(statusCode);
} else {
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
request.setAttribute(requestAttr, msg);
boolean currentSessionActive = MCRSessionMgr.hasCurrentSession();
boolean sessionFromRequest = setCurrentSession(request);
MCRSession session = null;
try {
MCRSessionMgr.unlock();
session = MCRSessionMgr.getCurrentSession();
boolean openTransaction = session.isTransactionActive();
if (!openTransaction) {
session.beginTransaction();
}
try {
setWebAppBaseURL(session, request);
LAYOUT_SERVICE.doLayout(request, response, new MCRJDOMContent(errorDoc));
} finally {
if (!openTransaction) {
session.commitTransaction();
}
}
} finally {
if (exceptionThrown || !currentSessionActive) {
MCRSessionMgr.releaseCurrentSession();
}
if (!sessionFromRequest) {
//new session created for transaction
session.close();
}
}
} else {
if (request.getAttribute(requestAttr) != null) {
LOGGER.warn("Could not send error page. Generating error page failed. The original message:\n{}",
request.getAttribute(requestAttr));
} else {
LOGGER.warn(
"Could not send error page. Response allready commited. The following message was given:\n{}", msg);
}
}
}
}
