/*
* Copyright 2002-2010 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.portlet.multipart;
import java.util.List;
import javax.portlet.ActionRequest;
import javax.portlet.PortletContext;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.portlet.PortletFileUpload;
import org.springframework.util.Assert;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.multipart.MultipartException;
import org.springframework.web.multipart.commons.CommonsFileUploadSupport;
import org.springframework.web.portlet.context.PortletContextAware;
import org.springframework.web.portlet.util.PortletUtils;
/**
* {@link PortletMultipartResolver} implementation for
* <a href="http://jakarta.apache.org/commons/fileupload">Jakarta Commons FileUpload</a>
* 1.2 or above.
*
* <p>Provides "maxUploadSize", "maxInMemorySize" and "defaultEncoding" settings as
* bean properties (inherited from {@link CommonsFileUploadSupport}). See corresponding
* PortletFileUpload / DiskFileItemFactory properties ("sizeMax", "sizeThreshold",
* "headerEncoding") for details in terms of defaults and accepted values.
*
* <p>Saves temporary files to the portlet container's temporary directory.
* Needs to be initialized <i>either</i> by an application context <i>or</i>
* via the constructor that takes a PortletContext (for standalone usage).
*
* @author Juergen Hoeller
* @since 2.0
* @see #CommonsPortletMultipartResolver(javax.portlet.PortletContext)
* @see #setResolveLazily
* @see org.springframework.web.multipart.commons.CommonsMultipartResolver
* @see org.apache.commons.fileupload.portlet.PortletFileUpload
* @see org.apache.commons.fileupload.disk.DiskFileItemFactory
*/
public class CommonsPortletMultipartResolver extends CommonsFileUploadSupport
implements PortletMultipartResolver, PortletContextAware {
private boolean resolveLazily = false;
/**
* Constructor for use as bean. Determines the portlet container's
* temporary directory via the PortletContext passed in as through the
* PortletContextAware interface (typically by an ApplicationContext).
* @see #setPortletContext
* @see org.springframework.web.portlet.context.PortletContextAware
*/
public CommonsPortletMultipartResolver() {
super();
}
/**
* Constructor for standalone usage. Determines the portlet container's
* temporary directory via the given PortletContext.
* @param portletContext the PortletContext to use
*/
public CommonsPortletMultipartResolver(PortletContext portletContext) {
this();
setPortletContext(portletContext);
}
/**
* Set whether to resolve the multipart request lazily at the time of
* file or parameter access.
* <p>Default is "false", resolving the multipart elements immediately, throwing
* corresponding exceptions at the time of the {@link #resolveMultipart} call.
* Switch this to "true" for lazy multipart parsing, throwing parse exceptions
* once the application attempts to obtain multipart files or parameters.
*/
public void setResolveLazily(boolean resolveLazily) {
this.resolveLazily = resolveLazily;
}
/**
* Initialize the underlying <code>org.apache.commons.fileupload.portlet.PortletFileUpload</code>
* instance. Can be overridden to use a custom subclass, e.g. for testing purposes.
* @return the new PortletFileUpload instance
*/
@Override
protected FileUpload newFileUpload(FileItemFactory fileItemFactory) {
return new PortletFileUpload(fileItemFactory);
}
public void setPortletContext(PortletContext portletContext) {
if (!isUploadTempDirSpecified()) {
getFileItemFactory().setRepository(PortletUtils.getTempDir(portletContext));
}
}
public boolean isMultipart(ActionRequest request) {
return (request != null && PortletFileUpload.isMultipartContent(request));
}
public MultipartActionRequest resolveMultipart(final ActionRequest request) throws MultipartException {
Assert.notNull(request, "Request must not be null");
if (this.resolveLazily) {
return new DefaultMultipartActionRequest(request) {
@Override
protected void initializeMultipart() {
MultipartParsingResult parsingResult = parseRequest(request);
setMultipartFiles(parsingResult.getMultipartFiles());
setMultipartParameters(parsingResult.getMultipartParameters());
}
};
}
else {
MultipartParsingResult parsingResult = parseRequest(request);
return new DefaultMultipartActionRequest(
request, parsingResult.getMultipartFiles(), parsingResult.getMultipartParameters());
}
}
/**
* Parse the given portlet request, resolving its multipart elements.
* @param request the request to parse
* @return the parsing result
* @throws MultipartException if multipart resolution failed.
*/
@SuppressWarnings("unchecked")
protected MultipartParsingResult parseRequest(ActionRequest request) throws MultipartException {
String encoding = determineEncoding(request);
FileUpload fileUpload = prepareFileUpload(encoding);
try {
List<FileItem> fileItems = ((PortletFileUpload) fileUpload).parseRequest(request);
return parseFileItems(fileItems, encoding);
}
catch (FileUploadBase.SizeLimitExceededException ex) {
throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
}
catch (FileUploadException ex) {
throw new MultipartException("Could not parse multipart portlet request", ex);
}
}
/**
* Determine the encoding for the given request.
* Can be overridden in subclasses.
* <p>The default implementation checks the request encoding,
* falling back to the default encoding specified for this resolver.
* @param request current portlet request
* @return the encoding for the request (never <code>null</code>)
* @see javax.portlet.ActionRequest#getCharacterEncoding
* @see #setDefaultEncoding
*/
protected String determineEncoding(ActionRequest request) {
String encoding = request.getCharacterEncoding();
if (encoding == null) {
encoding = getDefaultEncoding();
}
return encoding;
}
public void cleanupMultipart(MultipartActionRequest request) {
if (request != null) {
try {
cleanupFileItems(request.getMultiFileMap());
}
catch (Throwable ex) {
logger.warn("Failed to perform multipart cleanup for portlet request", ex);
}
}
}
}
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