inet.common.jsf.request.FileUploadFilter.java Source code

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Here is the source code for inet.common.jsf.request.FileUploadFilter.java

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/*
 * Copyright 2009-2013 PrimeTek.
 *
 * 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 inet.common.jsf.request;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.context.FacesContext;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUploadFilter implements Filter {

    private final static Logger logger = Logger.getLogger(FileUploadFilter.class.getName());

    private final static String THRESHOLD_SIZE_PARAM = "thresholdSize";

    private final static String UPLOAD_DIRECTORY_PARAM = "uploadDirectory";

    private String thresholdSize;

    private String uploadDir;

    private boolean bypass;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        boolean isAtLeastJSF22 = detectJSF22();
        String uploader = filterConfig.getServletContext().getInitParameter("primefaces.UPLOADER");
        if (uploader == null || uploader.equals("auto")) {
            bypass = isAtLeastJSF22;
        } else if (uploader.equals("native")) {
            bypass = true;
        } else if (uploader.equals("commons")) {
            bypass = false;
        }

        thresholdSize = filterConfig.getInitParameter(THRESHOLD_SIZE_PARAM);
        uploadDir = filterConfig.getInitParameter(UPLOAD_DIRECTORY_PARAM);
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)
            throws IOException, ServletException {

        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        boolean isMultipart = ServletFileUpload.isMultipartContent(httpServletRequest);

        if (isMultipart && !(request instanceof MultipartRequest)) {
            DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
            if (thresholdSize != null) {
                diskFileItemFactory.setSizeThreshold(Integer.valueOf(thresholdSize));
            }
            if (uploadDir != null) {
                diskFileItemFactory.setRepository(new File(uploadDir));
            }

            ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
            MultipartRequest multipartRequest = new MultipartRequest(httpServletRequest, servletFileUpload);

            filterChain.doFilter(multipartRequest, response);
        } else {
            filterChain.doFilter(request, response);
        }
    }

    @Override
    public void destroy() {
        if (logger.isLoggable(Level.FINE)) {
            logger.fine("Destroying FileUploadFilter");
        }
    }

    private boolean detectJSF22() {
        String version = FacesContext.class.getPackage().getImplementationVersion();

        if (version != null) {
            return version.startsWith("2.2");
        } else {
            //fallback
            try {
                Class.forName("javax.faces.flow.Flow");
                return true;
            } catch (ClassNotFoundException ex) {
                return false;
            }
        }
    }

}