235 lines
8.3 KiB
Java
Executable File
235 lines
8.3 KiB
Java
Executable File
/*
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* Copyright (C) 2001-2004 Red Hat Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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package com.arsdigita.cms.dispatcher;
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import com.arsdigita.bebop.parameters.BigDecimalParameter;
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import com.arsdigita.cms.Asset;
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import com.arsdigita.cms.ImageAsset;
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import com.arsdigita.dispatcher.DispatcherHelper;
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import com.arsdigita.dispatcher.RequestContext;
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import com.arsdigita.domain.DataObjectNotFoundException;
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import com.arsdigita.domain.DomainObjectFactory;
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import com.arsdigita.mimetypes.MimeType;
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import com.arsdigita.persistence.OID;
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import com.arsdigita.toolbox.ui.OIDParameter;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.math.BigDecimal;
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import javax.servlet.ServletException;
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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.log4j.Logger;
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/**
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* A resource handler which streams out a blob from the database.
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*
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* @author Stanislav Freidin (sfreidin@arsdigita.com)
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* @author Michael Pih (pihman@arsdigita.com)
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* @version $Revision: #20 $ $DateTime: 2004/08/17 23:15:09 $
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* @version $Id: BaseImage.java 1571 2007-04-20 15:57:54Z apevec $
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*/
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public class BaseImage extends ResourceHandlerImpl {
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public static final String IMAGE_ID = "image_id";
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public static final String OID_PARAM = "oid";
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private final static String s_defaultName = "Image";
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// the transactionID and objectID allow us to rollback to a specific
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// version of an image. If we only have a transactionID and
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// the item is its own master then we can also roll it back
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// public static final String TRANSACTION_ID = "transID";
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// public static final String OBJECT_ID = "objectID";
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private BigDecimalParameter m_imageId;
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private OIDParameter m_oid;
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// private BigDecimalParameter m_transactionID;
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// private BigDecimalParameter m_objectID;
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private final boolean m_download;
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private String m_disposition;
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private static final Logger s_log =
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Logger.getLogger(BaseImage.class);
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/**
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* Construct the resource handler
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*/
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public BaseImage(boolean download) {
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m_imageId = new BigDecimalParameter(IMAGE_ID);
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m_oid = new OIDParameter(OID_PARAM);
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// m_transactionID = new BigDecimalParameter(TRANSACTION_ID);
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// m_objectID = new BigDecimalParameter(OBJECT_ID);
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m_download = download;
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if (m_download) {
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m_disposition = "attachment; filename=";
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} else {
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m_disposition = "inline; filename=";
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}
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}
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/**
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* Sets RFC2183 governed Contnet-Disposition header to supply filename to
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* client. See section 19.5.1 of RFC2616 for interpretation of
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* Content-Disposition in HTTP.
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*/
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protected void setFilenameHeader(HttpServletResponse response,
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ImageAsset image) {
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String filename = image.getName();
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if (filename == null) {
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filename = s_defaultName;
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}
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// quote the file name to deal with any special
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// characters in the name of the file
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StringBuilder disposition = new StringBuilder(m_disposition);
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disposition.append('"').append(filename).append('"');
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response.setHeader("Content-Disposition", disposition.toString());
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}
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private void setHeaders(HttpServletResponse response,
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ImageAsset image) {
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setFilenameHeader(response, image);
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Long contentLength = new Long(image.getSize());
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response.setContentLength(contentLength.intValue());
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MimeType mimeType = image.getMimeType();
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if (m_download || mimeType == null) {
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// Section 19.5.1 of RFC2616 says this implies download
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// instead of view
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response.setContentType("application/octet-stream");
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} else {
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response.setContentType(mimeType.getMimeType());
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}
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// Default caching for all other types
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if ("live".equals(image.getVersion())) {
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DispatcherHelper.cacheForWorld(response);
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} else {
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DispatcherHelper.cacheDisable(response);
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}
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}
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private void send(HttpServletResponse response,
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ImageAsset image) throws IOException {
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// Stream the blob.
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OutputStream out = response.getOutputStream();
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try {
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image.writeBytes(out);
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} finally {
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out.close();
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}
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}
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/**
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* Streams an image from the database.
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*
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* @param request The servlet request object
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* @param response the servlet response object
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* @param actx The request context
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*/
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@Override
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public void dispatch(HttpServletRequest request,
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HttpServletResponse response,
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RequestContext actx)
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throws IOException, ServletException {
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// Fetch and validate the image ID
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OID oid = null;
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BigDecimal imageId = null;
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// BigDecimal transactionID = null;
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// BigDecimal objectID = null;
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try {
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oid = (OID) m_oid.transformValue(request);
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imageId = (BigDecimal) m_imageId.transformValue(request);
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// transactionID =
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// (BigDecimal) m_transactionID.transformValue(request);
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// objectID =
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// (BigDecimal) m_objectID.transformValue(request);
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} catch (Exception e) {
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response.sendError(HttpServletResponse.SC_BAD_REQUEST,
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e.toString());
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return;
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}
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if (imageId == null && oid == null) {
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response.sendError(HttpServletResponse.SC_BAD_REQUEST,
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"either " + IMAGE_ID + " or " + OID_PARAM + " is required.");
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return;
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} else if (imageId != null && oid != null) {
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response.sendError(HttpServletResponse.SC_BAD_REQUEST,
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"either " + IMAGE_ID + " or " + OID_PARAM + " is required.");
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return;
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}
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if (oid == null) {
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oid = new OID(ImageAsset.BASE_DATA_OBJECT_TYPE, imageId);
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}
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// Transaction transaction = null;
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// GenericArticle article = null;
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// XXX: add back rollback
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/*if (transactionID != null) {
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try {
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transaction =
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new Transaction(transactionID);
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// we have a transaction so let's see if we have an article
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if (objectID != null) {
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article = new GenericArticle(objectID);
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article.rollBackTo(transaction);
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}
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} catch (DataObjectNotFoundException e) {
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s_log.warn("Unable to locate transaction " + transactionID);
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// this is non-critical so we just continue
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}
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}*/
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ImageAsset image = null;
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// if (article == null) {
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try {
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Asset a = (Asset) DomainObjectFactory.newInstance(oid);
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if (a instanceof ImageAsset) {
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image = (ImageAsset) a;
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} else {
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if (s_log.isInfoEnabled()) {
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s_log.info("Asset " + oid + " is not an ImageAsset");
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}
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}
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} catch (DataObjectNotFoundException nfe) {
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response.sendError(HttpServletResponse.SC_NOT_FOUND,
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"no ImageAsset with oid " + oid);
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return;
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}
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// }
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// if (image.getMimeType() == null) {
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// response.sendError(HttpServletResponse.SC_NOT_FOUND,
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// "MIME type not found for ImageAsset " + imageId);
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// }
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// Not until permissions are properly assigned to assets
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//checkUserAccess(request, response, actx, image);
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// response.setContentType(image.getMimeType().getMimeType());
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setHeaders(response, image);
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send(response, image);
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}
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}
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