org.exoplatform.services.rest.impl.provider.MultipartFormDataEntityProvider.java Source code

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Here is the source code for org.exoplatform.services.rest.impl.provider.MultipartFormDataEntityProvider.java

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/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.services.rest.impl.provider;

import org.apache.commons.fileupload.DefaultFileItemFactory;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.exoplatform.commons.utils.SecurityHelper;
import org.exoplatform.services.rest.ApplicationContext;
import org.exoplatform.services.rest.RequestHandler;
import org.exoplatform.services.rest.impl.ApplicationContextImpl;
import org.exoplatform.services.rest.provider.EntityProvider;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;

/**
 * Processing multipart data based on apache fileupload.
 * 
 * @author <a href="mailto:andrew00x@gmail.com">Andrey Parfonov</a>
 * @version $Id: $
 */
@Provider
@Consumes({ "multipart/*" })
public class MultipartFormDataEntityProvider implements EntityProvider<Iterator<FileItem>> {

    /**
     * @see HttpServletRequest
     */
    @Context
    private HttpServletRequest httpRequest;

    /**
     * {@inheritDoc}
     */
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        if (type == Iterator.class) {
            try {
                ParameterizedType t = (ParameterizedType) genericType;
                Type[] ta = t.getActualTypeArguments();
                if (ta.length == 1 && ta[0] == FileItem.class) {
                    return true;
                }
                return false;
            } catch (ClassCastException e) {
                return false;
            }
        }

        return false;
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    public Iterator<FileItem> readFrom(Class<Iterator<FileItem>> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
            throws IOException {
        try {
            ApplicationContext context = ApplicationContextImpl.getCurrent();
            int bufferSize = context.getProperties().get(RequestHandler.WS_RS_BUFFER_SIZE) == null
                    ? RequestHandler.WS_RS_BUFFER_SIZE_VALUE
                    : Integer.parseInt(context.getProperties().get(RequestHandler.WS_RS_BUFFER_SIZE));
            File repo = new File(context.getProperties().get(RequestHandler.WS_RS_TMP_DIR));

            DefaultFileItemFactory factory = new DefaultFileItemFactory(bufferSize, repo);
            final FileUpload upload = new FileUpload(factory);

            return SecurityHelper.doPrivilegedExceptionAction(new PrivilegedExceptionAction<Iterator<FileItem>>() {
                public Iterator<FileItem> run() throws Exception {
                    return upload.parseRequest(httpRequest).iterator();
                }
            });
        } catch (PrivilegedActionException pae) {
            Throwable cause = pae.getCause();
            if (cause instanceof FileUploadException) {
                throw new IOException("Can't process multipart data item " + cause, cause);
            } else if (cause instanceof RuntimeException) {
                throw (RuntimeException) cause;
            } else {
                throw new RuntimeException(cause);
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    public long getSize(Iterator<FileItem> t, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType) {
        return -1;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        // output is not supported
        return false;
    }

    /**
     * {@inheritDoc}
     */
    public void writeTo(Iterator<FileItem> t, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException {
        throw new UnsupportedOperationException();
    }

}