001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Anahide Tchertchian
018 */
019package org.nuxeo.ecm.automation.jsf.operations;
020
021import java.io.IOException;
022import java.util.Collections;
023
024import javax.faces.context.ExternalContext;
025import javax.faces.context.FacesContext;
026import javax.servlet.http.HttpServletRequest;
027import javax.servlet.http.HttpServletResponse;
028
029import org.apache.commons.logging.Log;
030import org.apache.commons.logging.LogFactory;
031import org.nuxeo.ecm.automation.OperationContext;
032import org.nuxeo.ecm.automation.OperationException;
033import org.nuxeo.ecm.automation.core.Constants;
034import org.nuxeo.ecm.automation.core.annotations.Context;
035import org.nuxeo.ecm.automation.core.annotations.Operation;
036import org.nuxeo.ecm.automation.core.annotations.OperationMethod;
037import org.nuxeo.ecm.core.api.Blob;
038import org.nuxeo.ecm.core.io.download.DownloadService;
039import org.nuxeo.ecm.platform.ui.web.auth.NXAuthConstants;
040import org.nuxeo.ecm.platform.ui.web.util.BaseURL;
041import org.nuxeo.runtime.api.Framework;
042
043/**
044 * @author Anahide Tchertchian
045 */
046@Operation(id = DownloadFile.ID, category = Constants.CAT_UI, requires = Constants.SEAM_CONTEXT, label = "Download file", description = "Download a file", aliases = { "Seam.DownloadFile" })
047public class DownloadFile {
048
049    protected static Log log = LogFactory.getLog(DownloadFile.class);
050
051    public static final String ID = "WebUI.DownloadFile";
052
053    @Context
054    protected OperationContext ctx;
055
056    @OperationMethod
057    public void run(Blob blob) throws OperationException, IOException {
058        if (blob == null) {
059            throw new OperationException("there is no file content available");
060        }
061        DownloadService downloadService = Framework.getService(DownloadService.class);
062        String key = downloadService.storeBlobs(Collections.singletonList(blob));
063        String url = BaseURL.getBaseURL()  + downloadService.getDownloadUrl(key);
064
065        ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
066        HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
067        HttpServletResponse response = (HttpServletResponse) externalContext.getResponse();
068
069        try {
070            // Operation was probably triggered by a POST
071            // so we need to de-activate the ResponseWrapper that would
072            // rewrite the URL
073            request.setAttribute(NXAuthConstants.DISABLE_REDIRECT_REQUEST_KEY, new Boolean(true));
074            // send the redirect
075            externalContext.redirect(url);
076            // mark all JSF processing as completed
077            response.flushBuffer();
078            FacesContext.getCurrentInstance().responseComplete();
079            // set Outcome to null (just in case)
080            ctx.getVars().put("Outcome", null);
081        } catch (IOException e) {
082            log.error("Error while redirecting for big blob downloader", e);
083        }
084    }
085
086}