org.eclipse.rap.addons.fileupload.internal.FileUploadProcessor.java Source code

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Here is the source code for org.eclipse.rap.addons.fileupload.internal.FileUploadProcessor.java

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/*******************************************************************************
 * Copyright (c) 2011, 2014 EclipseSource and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    EclipseSource - initial API and implementation
 ******************************************************************************/
package org.eclipse.rap.addons.fileupload.internal;

import java.io.IOException;
import java.io.InputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.eclipse.rap.addons.fileupload.FileDetails;
import org.eclipse.rap.addons.fileupload.FileUploadHandler;
import org.eclipse.rap.addons.fileupload.FileUploadReceiver;

final class FileUploadProcessor {

    private final FileUploadHandler handler;
    private final FileUploadTracker tracker;

    FileUploadProcessor(FileUploadHandler handler) {
        this.handler = handler;
        tracker = new FileUploadTracker(handler);
    }

    void handleFileUpload(HttpServletRequest request, HttpServletResponse response) throws IOException {
        try {
            ServletFileUpload upload = createUpload();
            FileItemIterator iter = upload.getItemIterator(request);
            while (iter.hasNext()) {
                FileItemStream item = iter.next();
                if (!item.isFormField()) {
                    receive(item);
                }
            }
            if (tracker.isEmpty()) {
                String errorMessage = "No file upload data found in request";
                tracker.setException(new Exception(errorMessage));
                tracker.handleFailed();
                response.sendError(HttpServletResponse.SC_BAD_REQUEST, errorMessage);
            } else {
                tracker.handleFinished();
            }
        } catch (Exception exception) {
            Throwable cause = exception.getCause();
            if (cause instanceof FileSizeLimitExceededException) {
                exception = (Exception) cause;
            }
            tracker.setException(exception);
            tracker.handleFailed();
            int errorCode = exception instanceof FileSizeLimitExceededException
                    ? HttpServletResponse.SC_REQUEST_ENTITY_TOO_LARGE
                    : HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
            response.sendError(errorCode, exception.getMessage());
        }
    }

    private ServletFileUpload createUpload() {
        ServletFileUpload upload = new ServletFileUpload();
        upload.setFileSizeMax(handler.getMaxFileSize());
        upload.setProgressListener(createProgressListener());
        return upload;
    }

    private ProgressListener createProgressListener() {
        ProgressListener result = new ProgressListener() {
            long prevTotalBytesRead = -1;

            public void update(long totalBytesRead, long contentLength, int item) {
                // Depending on the servlet engine and other environmental factors,
                // this listener may be notified for every network packet, so don't notify unless there
                // is an actual increase.
                if (totalBytesRead > prevTotalBytesRead) {
                    prevTotalBytesRead = totalBytesRead;
                    tracker.setContentLength(contentLength);
                    tracker.setBytesRead(totalBytesRead);
                    tracker.handleProgress();
                }
            }
        };
        return result;
    }

    private void receive(FileItemStream item) throws IOException {
        InputStream stream = item.openStream();
        try {
            String fileName = stripFileName(item.getName());
            String contentType = item.getContentType();
            FileDetails details = new FileDetailsImpl(fileName, contentType, -1);
            FileUploadReceiver receiver = handler.getReceiver();
            receiver.receive(stream, details);
            tracker.addFile(details);
        } finally {
            stream.close();
        }
    }

    private static String stripFileName(String name) {
        String result = name;
        int lastSlash = result.lastIndexOf('/');
        if (lastSlash != -1) {
            result = result.substring(lastSlash + 1);
        } else {
            int lastBackslash = result.lastIndexOf('\\');
            if (lastBackslash != -1) {
                result = result.substring(lastBackslash + 1);
            }
        }
        return result;
    }

}