/*
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Dateiverwaltung - File management in your browser
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Copyright (C) 2017 Ulrich Hilger, http://uhilger.de
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package de.uhilger.filecms.api;
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import static de.uhilger.filecms.api.FileMgr.HOME_DIR_NAME;
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import static de.uhilger.filecms.api.FileMgr.HOME_DIR_PATH;
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import static de.uhilger.filecms.api.FileMgr.PUB_DIR_NAME;
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import static de.uhilger.filecms.api.FileMgr.PUB_DIR_PATH;
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import de.uhilger.filecms.web.Initialiser;
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import de.uhilger.filesystem.FileRef;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.security.Principal;
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import java.util.Iterator;
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import java.util.List;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.commons.fileupload.FileItem;
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import org.apache.commons.fileupload.disk.DiskFileItemFactory;
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import org.apache.commons.fileupload.servlet.FileCleanerCleanup;
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import org.apache.commons.fileupload.servlet.ServletFileUpload;
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import org.apache.commons.io.FileCleaningTracker;
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/**
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* Objekte der Klasee UploadServlet nehmen eine Datei per HTTP Multipart Request
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* entgegen und speichern sie im webapps-Verzeichnis des Servlet-Containers.
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*
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* Annahme ist, dass das von javax.servlet.context.tempdir bezeichnete
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* Verzeichnis auf CATALINA_BASE/work/Catalina/localhost/[context] zeigt. Von
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* dort wird dann das webapps-Verzeichnis als CATALINA_BASE/webapps ermittelt.
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*/
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public class UploadServlet extends HttpServlet {
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public static final String DESC = "file-cms uploader";
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private static final Logger logger = Logger.getLogger(UploadServlet.class.getName());
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/**
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* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
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* methods.
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*
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* @param request servlet request
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* @param response servlet response
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* @throws ServletException if a servlet-specific error occurs
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* @throws IOException if an I/O error occurs
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*/
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protected void processRequest(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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//logger.log(Level.INFO, "start");
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boolean isMultipart = ServletFileUpload.isMultipartContent(request);
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if (isMultipart) {
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//logger.log(Level.INFO, "isMultipart");
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try {
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ServletContext servletContext = this.getServletConfig().getServletContext();
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// Configure a repository (to ensure a secure temp location is used)
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File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");
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// CATALINA_BASE/work/Catalina/localhost/wbx
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// Create a factory for disk-based file items
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DiskFileItemFactory factory = newDiskFileItemFactory(servletContext, repository);
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// Create a new file upload handler
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ServletFileUpload upload = new ServletFileUpload(factory);
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// Parse the request
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List<FileItem> items = upload.parseRequest(request);
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// Process the uploaded items
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Iterator<FileItem> iter = items.iterator();
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while (iter.hasNext()) {
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FileItem item = iter.next();
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if (item.isFormField()) {
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processFormField(item);
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} else {
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//File base = repository.getParentFile().getParentFile().getParentFile().getParentFile();
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//File webapps = new File(base, "webapps");
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//logger.info(webapps.getAbsolutePath());
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File targetDir = getTargetDir(request, PUB_DIR_NAME);
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logger.log(Level.FINE, "rufe processUploadedFile");
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processUploadedFile(targetDir, item, true);
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}
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}
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} catch (Exception ex) {
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logger.log(Level.SEVERE, null, ex);
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}
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} else {
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// kein Upload
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}
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/*
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response.setContentType("text/html;charset=UTF-8");
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try (PrintWriter out = response.getWriter()) {
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out.println("<!DOCTYPE html>");
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out.println("<html>");
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out.println("<head>");
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out.println("<title>Servlet UploadServlet</title>");
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out.println("</head>");
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out.println("<body>");
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out.println("<h1>Servlet UploadServlet at " + request.getContextPath() + "</h1>");
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out.println("</body>");
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out.println("</html>");
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}
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*/
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}
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private File getTargetDir(HttpServletRequest request, String relPath) {
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logger.finer(relPath);
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String targetPath = null;
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if(relPath.startsWith(PUB_DIR_NAME)) {
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targetPath = PUB_DIR_PATH + getUserName(request) + "/" + relPath.substring(PUB_DIR_NAME.length());
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} else if(relPath.startsWith(HOME_DIR_NAME)) {
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targetPath = HOME_DIR_PATH + getUserName(request) + "/" + relPath.substring(HOME_DIR_NAME.length());
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} else {
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// kann eigentlich nicht sein..
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}
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logger.finer(targetPath);
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File targetDir = new File(getBase().getAbsolutePath(), targetPath);
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return targetDir;
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}
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private String getUserName(HttpServletRequest request) {
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String userName = null;
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Object p = request.getUserPrincipal();
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if (p instanceof Principal) {
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userName = ((Principal) p).getName();
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}
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return userName;
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}
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private FileRef getBase() {
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FileRef base = null;
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Object o = getServletContext().getAttribute(Initialiser.FILE_BASE);
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if (o instanceof FileRef) {
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base = (FileRef) o;
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}
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return base;
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}
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private void processUploadedFile(File targetDir, FileItem item, boolean writeToFile) throws Exception {
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//logger.log(Level.INFO, "start");
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// Process a file upload
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if (!item.isFormField()) {
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String fieldName = item.getFieldName();
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String fileName = item.getName();
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String contentType = item.getContentType();
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boolean isInMemory = item.isInMemory();
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long sizeInBytes = item.getSize();
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// Process a file upload
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if (writeToFile) {
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//logger.log(Level.INFO, "writeToFile " + fileName);
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File uploadedFile = new File(targetDir, fileName);
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item.write(uploadedFile);
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} else {
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InputStream uploadedStream = item.getInputStream();
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//...
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uploadedStream.close();
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}
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}
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}
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private void processFormField(FileItem item) {
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//logger.log(Level.INFO, "start");
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// Process a regular form field
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if (item.isFormField()) {
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String name = item.getFieldName();
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String value = item.getString();
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//logger.log(Level.INFO, "field name: " + name + ", value: " + value);
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//...
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}
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}
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public static DiskFileItemFactory newDiskFileItemFactory(ServletContext context,
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File repository) {
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FileCleaningTracker fileCleaningTracker
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= FileCleanerCleanup.getFileCleaningTracker(context);
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DiskFileItemFactory factory
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= new DiskFileItemFactory(DiskFileItemFactory.DEFAULT_SIZE_THRESHOLD,
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repository);
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factory.setFileCleaningTracker(fileCleaningTracker);
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return factory;
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}
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// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
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/**
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* Handles the HTTP <code>GET</code> method.
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*
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* @param request servlet request
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* @param response servlet response
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* @throws ServletException if a servlet-specific error occurs
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* @throws IOException if an I/O error occurs
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*/
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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processRequest(request, response);
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}
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/**
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* Handles the HTTP <code>POST</code> method.
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*
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* @param request servlet request
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* @param response servlet response
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* @throws ServletException if a servlet-specific error occurs
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* @throws IOException if an I/O error occurs
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*/
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@Override
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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processRequest(request, response);
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}
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/**
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* Returns a short description of the servlet.
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*
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* @return a String containing servlet description
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*/
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@Override
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public String getServletInfo() {
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return DESC;
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}// </editor-fold>
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}
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