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. Added support for 'Last-Modified' response header value and 'If-Modified-Since' request header value in the DownloadContentServlet.

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- browsers can now correctly cache Alfresco content based on last-modified date of the node.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@3485 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Kevin Roast
2006-08-11 14:16:52 +00:00
parent 65f394a878
commit a6449221db
1 changed files with 18 additions and 0 deletions
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18
source/java/org/alfresco/web/app/servlet/DownloadContentServlet.java
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@@ -21,6 +21,7 @@ import java.io.UnsupportedEncodingException;
import java.net.SocketException;
import java.net.URLEncoder;
import java.text.MessageFormat;
import java.util.Date;
import java.util.StringTokenizer;
import javax.servlet.ServletException;
@@ -35,6 +36,7 @@ import org.alfresco.service.cmr.repository.ContentReader;
import org.alfresco.service.cmr.repository.ContentService;
import org.alfresco.service.cmr.repository.MimetypeService;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.cmr.repository.StoreRef;
import org.alfresco.service.cmr.security.AccessStatus;
import org.alfresco.service.cmr.security.PermissionService;
@@ -170,6 +172,7 @@ public class DownloadContentServlet extends BaseServlet
// get the services we need to retrieve the content
ServiceRegistry serviceRegistry = getServiceRegistry(getServletContext());
NodeService nodeService = serviceRegistry.getNodeService();
ContentService contentService = serviceRegistry.getContentService();
PermissionService permissionService = serviceRegistry.getPermissionService();
@@ -184,6 +187,21 @@ public class DownloadContentServlet extends BaseServlet
return;
}
// check If-Modified-Since header and set Last-Modified header as appropriate
Date modified = (Date)nodeService.getProperty(nodeRef, ContentModel.PROP_MODIFIED);
long modifiedSince = req.getDateHeader("If-Modified-Since");
if (modifiedSince > 0L)
{
// round the date to the ignore millisecond value which is not supplied by header
long modDate = (modified.getTime() / 1000L) * 1000L;
if (modDate <= modifiedSince)
{
res.setStatus(304);
return;
}
}
res.setDateHeader("Last-Modified", modified.getTime());
if (attachment == true)
{
// set header based on filename - will force a Save As from the browse if it doesn't recognise it