pl.exsio.plupload.PluploadReceiver.java Source code

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Here is the source code for pl.exsio.plupload.PluploadReceiver.java

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/* 
 * The MIT License
 *
 * Copyright 2015 exsio.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package pl.exsio.plupload;

import com.vaadin.server.RequestHandler;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinResponse;
import com.vaadin.server.VaadinServletRequest;
import com.vaadin.server.VaadinSession;
import java.io.IOException;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import pl.exsio.plupload.ex.InvalidFileHandlerException;
import pl.exsio.plupload.handler.PluploadChunkHandler;

/**
 *
 * @author exsio
 */
public class PluploadReceiver implements RequestHandler, Serializable {

    public static final String UPLOAD_ACTION_PATH = "pluploader-upload-action";

    private final Map<String, PluploadChunkHandler> expectedFiles = Collections.synchronizedMap(new HashMap());

    private PluploadReceiver() {
    }

    public static PluploadReceiver getInstance() {
        VaadinSession session = VaadinSession.getCurrent();
        for (RequestHandler handler : session.getRequestHandlers()) {
            if (handler instanceof PluploadReceiver) {
                return (PluploadReceiver) handler;
            }
        }

        PluploadReceiver receiver = new PluploadReceiver();
        session.addRequestHandler(receiver);
        return receiver;
    }

    @Override
    public boolean handleRequest(VaadinSession session, VaadinRequest request, VaadinResponse response)
            throws IOException {
        if (request.getPathInfo() != null && request.getPathInfo().endsWith(UPLOAD_ACTION_PATH)) {
            if (request instanceof VaadinServletRequest) {
                VaadinServletRequest vsr = (VaadinServletRequest) request;
                HttpServletRequest req = vsr.getHttpServletRequest();
                if (ServletFileUpload.isMultipartContent(req)) {
                    try {
                        synchronized (this) {
                            ServletFileUpload upload = new ServletFileUpload();
                            FileItemIterator items = upload.getItemIterator(req);
                            PluploadChunk chunk = PluploadChunkFactory.create(items);
                            PluploadChunkHandler fileHandler = this.getExpectedFileHandler(chunk.getFileId());
                            fileHandler.handleUploadedChunk(chunk);
                            this.writeResponse(chunk, response);
                        }
                    } catch (Exception ex) {
                        response.getWriter().append("file upload unsuccessful, because of "
                                + ex.getClass().getName() + ":" + ex.getMessage());
                        throw new IOException(
                                "There was a problem during processing of uploaded chunk. Nested exceptions may have more info.",
                                ex);
                    }
                    return true;
                }
            }
        }
        return false;

    }

    protected void writeResponse(PluploadChunk chunk, VaadinResponse response) throws IOException {
        if (chunk.isLast()) {
            response.getWriter().append("file " + chunk.getName() + " uploaded successfuly");
        } else {
            response.getWriter().append(
                    "file chunk " + (chunk.getChunk() + 1) + " of " + chunk.getChunks() + " uploaded successfuly");
        }
        response.setContentType("text/plain");
    }

    protected PluploadChunkHandler getExpectedFileHandler(String fileId) {
        if (this.isFileExpected(fileId)) {
            return this.expectedFiles.get(fileId);
        } else {
            throw new InvalidFileHandlerException("There is no PluploadChunkHandler configured for file " + fileId);
        }
    }

    public boolean isFileExpected(String fileId) {
        return this.expectedFiles.containsKey(fileId);
    }

    public void addExpectedFile(String fileId, PluploadChunkHandler fileHandler) {
        this.expectedFiles.put(fileId, fileHandler);
    }

    public void removeExpectedFile(String fileId) {
        this.expectedFiles.remove(fileId);
    }

}