[cocoon3] @Context Request request

[Andre Juffer <aj...@cc.oulu.fi>]

I was able to resolve one or two problems. The commons fileupload FAQ 
gave a hint [1]. Thus, I looked for a solution that relies on a Filter 
and came across [2]. This Filter creates a HttpServletRequestWrapper 
(implements HttpServletRequest) that parses the request whenever dealing 
with a file upload using commons fileupload. This works very nice. I was 
supposed to see two FileItems [3] (which I never got up to this point) 
and this is now exactly what I get. Thus, the request is parsed properly 
and everything (including the image file) is available.

However, the filter continues with

aChain.doFilter(wrapper, aResponse);

and this eventually results in an exception (listing below just the 
cocoon part):

com.sun.jersey.api.container.ContainerException: 
javax.mail.MessagingException: Missing start boundary
at 
com.sun.jersey.server.impl.model.method.dispatch.MultipartFormDispatchProvider.processForm(MultipartFormDispatchProvider.java:91)
....
at 
org.apache.cocoon.rest.jaxrs.container.CocoonJAXRSServlet.service(CocoonJAXRSServlet.java:60)
....
at 
org.apache.cocoon.servletservice.ServletServiceContext$PathDispatcher.forward(ServletServiceContext.java:481)
at 
org.apache.cocoon.servletservice.ServletServiceContext$PathDispatcher.forward(ServletServiceContext.java:455)
at 
org.apache.cocoon.servletservice.spring.ServletFactoryBean$ServiceInterceptor.invoke(ServletFactoryBean.java:245)
...
com.tribc.servlet.FileUploadFilter.doFilter(FileUploadFilter.java:70) 
(This is the aChain.doFilter(wrapper, aResponse);
...

Therefore, the request now never reaches the ImageResource.

I cannot really understand the exception. The 
javax.mail.MessagingException is puzzling. I have to assume that in [2] 
something is not entirely correct, as the exception only occurs whenever 
the filter is employed. I do not see it. As said, the parsing appears to 
work just fine. Hopefully one of you has a clue.

Thanks,
André



[1] http://commons.apache.org/fileupload/faq.html#empty-parse
[2] http://www.javapractices.com/topic/TopicAction.do?Id=221
[3] 
http://commons.apache.org/fileupload/apidocs/org/apache/commons/fileupload/FileItem.html

-- 
Andre H. Juffer              | Phone: +358-8-553 1161
Biocenter Oulu and           | Fax: +358-8-553-1141
Department of Biochemistry   | Email: andre.juffer@oulu.fi
University of Oulu, Finland  | WWW: www.biochem.oulu.fi/Biocomputing/
StruBioCat                   | WWW: www.strubiocat.oulu.fi
Triacle Biocomputing         | WWW: www.triacle-bc.com

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Re: [cocoon3] @Context Request request

[Andre Juffer <aj...@cc.oulu.fi>]

Hi All,

I have followed another track to be able to an upload image file that 
are processed by a REST resource. It does not rely upon the @Context 
Request request. The Filter I have tried before (while actually working 
correctly) did cause particular issues that I was not able to correct.

Below is a copy of a simple REST ImageResource that is capable of 
extracting a single image and storing it in a given location. There is 
no need to modify anything in web.xml (as with the Filer).

Here is the code:

<code>

import org.apache.cocoon.configuration.Settings;
import org.apache.cocoon.rest.jaxrs.response.URLResponseBuilder;

import javax.ws.rs.*;
import javax.ws.rs.core.*;
import com.sun.jersey.multipart.*;

import java.util.*;
import java.io.*;

/**
  *
  * @author Andr&#233; Juffer, Triacle Biocomputing
  */
@Path("/image")
public class ImageResource {

     private String tempFolder;

     public ImageResource()
     {
         this.tempFolder = null;
     }

     public void setTempFolder(String tempFolder)
     {
         this.tempFolder = tempFolder;
     }

     /**
      * Uploads a single image.
      * @param parts Requests parts.
      * @return
      */
     @POST
     @Path("/creator/{id}")
     @Consumes(MediaType.MULTIPART_FORM_DATA)
     @Produces({"application/xml", "application/json"})
     public Response newImage(@PathParam("id") String creatorId,
                              final FormDataMultiPart parts)
     {
	// Find part with image.
         InputStream inputStream = null;
         String filename = null;
         Iterator<BodyPart> iterator = parts.getBodyParts().iterator();
         while ( iterator.hasNext() && inputStream == null ) {
             BodyPart bodyPart = iterator.next();
             if ( this.isImage(bodyPart) ) {
                 inputStream = this.getInputStream(bodyPart);
                 filename = this.getFilename(bodyPart);
             }
         }

	// NOTE: Other parts representing other form fields may be
	// extracted as well. One can even extract more than one
	// file.

	// Do something with image. E.g. move to some folder.
         String destFilename = tempFolder + "/" + filename;
         MoveFile.moveToFolder(inputStream, destFilename);

         // Point to e.g. a pipeline in your sitemap.
	String url = "....";

	// Create response.
         Map<String, Object> map = new HashMap<String, Object>();
         return URLResponseBuilder.newInstance(url, map).build();
     }

     private String getFilename(BodyPart bodyPart)
     {
         return bodyPart.getContentDisposition().getFileName();
     }

     private boolean isImage(BodyPart bodyPart)
     {
         return bodyPart.getMediaType().getType().indexOf("image") != -1;
     }

     private InputStream getInputStream(BodyPart bodyPart)
     {
         return ((BodyPartEntity)bodyPart.getEntity()).getInputStream();
     }
}

</code>

You need to include in your pom.xml the following dependency:

<dependency>
   <groupId>com.sun.jersey.contribs</groupId>
   <artifactId>jersey-multipart</artifactId>
   <version>1.8</version>
</dependency>

Feel free to use this code for your own purposes.

Best regards,

-- 
Andre H. Juffer              | Phone: +358-8-553 1161
Biocenter Oulu and           | Fax: +358-8-553-1141
Department of Biochemistry   | Email: andre.juffer@oulu.fi
University of Oulu, Finland  | WWW: www.biochem.oulu.fi/Biocomputing/
StruBioCat                   | WWW: www.strubiocat.oulu.fi
Triacle Biocomputing         | WWW: www.triacle-bc.com

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