Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* 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 .
*/
package org.mycore.datamodel.ifs;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Arrays;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.TransformerException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.jdom2.Document;
import org.mycore.access.MCRAccessManager;
import org.mycore.common.content.MCRContent;
import org.mycore.common.content.MCRJDOMContent;
import org.mycore.common.content.MCRPathContent;
import org.mycore.datamodel.metadata.MCRObjectID;
import org.mycore.datamodel.niofs.MCRPath;
import org.mycore.datamodel.niofs.MCRPathXML;
import org.mycore.frontend.servlets.MCRContentServlet;
import org.xml.sax.SAXException;
/**
* This servlet delivers the contents of an MCRFilesystemNode to the client
* browser. If the node is a ordinary MCRFile, the contents of that file will be
* sent to the browser. If the node is an MCRFile with a MCRAudioVideoExtender,
* the message that starts the associated streaming player will be delivered. If
* the node is a MCRDirectory, the contents of that directory will be forwareded
* to MCRLayoutService as XML data to display a detailed directory listing.
*
* @author Frank Lützenkirchen
* @author Jens Kupferschmidt
* @author Thomas Scheffler (yagee)
* @author A.Schaar
* @author Robert Stephan
*
* @version $Revision$ $Date$
*/
public class MCRFileNodeServlet extends MCRContentServlet {
private static final long serialVersionUID = 1L;
private static Logger LOGGER = LogManager.getLogger(MCRFileNodeServlet.class);
private static Pattern patternDerivateID = Pattern.compile(".+_derivate_[0-9]+");
/* (non-Javadoc)
* @see org.mycore.frontend.servlets.MCRContentServlet#getContent(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
@Override
public MCRContent getContent(HttpServletRequest request, HttpServletResponse response) throws IOException {
if (!isParametersValid(request, response)) {
return null;
}
String ownerID = getOwnerID(request);
if (ownerID != null && ownerID.length() > 0) {
//make sure, that numberpart of ownerID has correct length
ownerID = MCRObjectID.getInstance(ownerID).toString();
}
if (!MCRAccessManager.checkDerivateContentPermission(MCRObjectID.getInstance(ownerID),
MCRAccessManager.PERMISSION_READ)) {
LOGGER.info("AccessForbidden to {}", request.getPathInfo());
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return null;
}
String path = getPath(request);
MCRPath mcrPath = MCRPath.getPath(ownerID, path);
BasicFileAttributes attr;
try {
attr = Files.readAttributes(mcrPath, BasicFileAttributes.class);
} catch (NoSuchFileException e) {
String msg = e.getMessage();
if (msg == null) {
msg = "File or directory not found: " + mcrPath;
}
response.sendError(HttpServletResponse.SC_NOT_FOUND, msg);
return null;
}
if (attr.isDirectory()) {
try {
return sendDirectory(request, response, mcrPath);
} catch (TransformerException | SAXException e) {
throw new IOException(e);
}
}
if (attr.isRegularFile()) {
return sendFile(request, response, mcrPath);
}
response.sendError(HttpServletResponse.SC_NOT_FOUND, "Not a file or directory: " + mcrPath);
return null;
}
private boolean isParametersValid(HttpServletRequest request, HttpServletResponse response) throws IOException {
String requestPath = request.getPathInfo();
LOGGER.debug("request path = {}", requestPath);
if (requestPath == null) {
response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Error: HTTP request path is null");
return false;
}
return true;
}
/**
* retrieves the derivate ID of the owning derivate from request path.
* Attention: derivateID is not always at the first position in path
* @param request - the http request object
*/
public static String getOwnerID(HttpServletRequest request) {
String pI = request.getPathInfo();
return Arrays.stream(pI.split("/"))
.filter(fragment -> patternDerivateID.matcher(fragment).matches())
.findFirst()
.orElse("");
}
/**
* Retrieves the path of the file to display from request path.
* @param request - the http request object
*/
protected String getPath(HttpServletRequest request) {
String pI = request.getPathInfo();
String ownerID = getOwnerID(request);
int pos = pI.indexOf(ownerID) + ownerID.length() + 1;
if (pos - 1 >= pI.length()) {
return "/";
}
String path = pI.substring(pos);
if (path.endsWith("/")) {
path = path.substring(0, path.length() - 1);
}
if (path.length() == 0) {
return "/";
}
return path;
}
private MCRContent sendFile(HttpServletRequest request, HttpServletResponse response, MCRPath mcrPath) {
// TODO: Does MCRFileNodeServlet really has to handle IFS1 AudioVideoExtender support? (last rev: 30037))
return new MCRPathContent(mcrPath);
}
/**
* Sends the contents of an MCRDirectory as XML data to the client
* @throws SAXException
* @throws TransformerException
*/
private MCRContent sendDirectory(HttpServletRequest request, HttpServletResponse response, MCRPath mcrPath)
throws IOException, TransformerException, SAXException {
Document directoryXML = MCRPathXML.getDirectoryXML(mcrPath);
MCRJDOMContent source = new MCRJDOMContent(directoryXML);
source.setLastModified(Files.getLastModifiedTime(mcrPath).toMillis());
String fileName = mcrPath.getNameCount() == 0 ? mcrPath.getOwner() : mcrPath.getFileName().toString();
source.setName(fileName);
return getLayoutService().getTransformedContent(request, response, source);
}
}
