/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* All rights reserved.
*
* 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 br.com.caelum.vraptor.interceptor.multipart;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Collection;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.Validator;
import br.com.caelum.vraptor.core.InterceptorStack;
import br.com.caelum.vraptor.http.InvalidParameterException;
import br.com.caelum.vraptor.http.MutableRequest;
import br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor;
import br.com.caelum.vraptor.ioc.RequestScoped;
import br.com.caelum.vraptor.resource.ResourceMethod;
import br.com.caelum.vraptor.validator.Validations;
import com.google.common.base.Strings;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Multimap;
/**
* A multipart interceptor based on Apache Commons Upload. Provided parameters are injected through
* RequestParameters.set and uploaded files are made available through
*
* @author Guilherme Silveira
* @author Otávio Scherer Garcia
*/
@Intercepts(before=ResourceLookupInterceptor.class, after = {})
@RequestScoped
public class CommonsUploadMultipartInterceptor
implements MultipartInterceptor {
private static final Logger logger = LoggerFactory.getLogger(CommonsUploadMultipartInterceptor.class);
private final HttpServletRequest request;
private final MutableRequest parameters;
private final MultipartConfig config;
private final Validator validator;
private final ServletFileUploadCreator fileUploadCreator;
public CommonsUploadMultipartInterceptor(HttpServletRequest request, MutableRequest parameters, MultipartConfig cfg,
Validator validator, ServletFileUploadCreator fileUploadCreator) {
this.request = request;
this.parameters = parameters;
this.validator = validator;
this.config = cfg;
this.fileUploadCreator = fileUploadCreator;
}
/**
* Will intercept the request if apache file upload says that this request is multipart
*/
public boolean accepts(ResourceMethod method) {
return ServletFileUpload.isMultipartContent(request);
}
public void intercept(InterceptorStack stack, ResourceMethod method, Object instance)
throws InterceptionException {
logger.info("Request contains multipart data. Try to parse with commons-upload.");
FileItemFactory factory = createFactoryForDiskBasedFileItems(config.getDirectory());
ServletFileUpload uploader = fileUploadCreator.create(factory);
uploader.setSizeMax(config.getSizeLimit());
try {
final List<FileItem> items = uploader.parseRequest(request);
logger.debug("Found {} attributes in the multipart form submission. Parsing them.", items.size());
final Multimap<String, String> params = LinkedListMultimap.create();
for (FileItem item : items) {
String name = item.getFieldName();
if (item.isFormField()) {
logger.debug("{} is a field", name);
params.put(name, getValue(item));
} else if (isNotEmpty(item)) {
logger.debug("{} is a file", name);
processFile(item, name);
} else {
logger.debug("A file field was empty: {}", item.getFieldName());
}
}
for (String paramName : params.keySet()) {
Collection<String> paramValues = params.get(paramName);
parameters.setParameter(paramName, paramValues.toArray(new String[paramValues.size()]));
}
} catch (final SizeLimitExceededException e) {
reportSizeLimitExceeded(e);
} catch (FileUploadException e) {
logger.warn("There was some problem parsing this multipart request, "
+ "or someone is not sending a RFC1867 compatible multipart request.", e);
}
stack.next(method, instance);
}
private boolean isNotEmpty(FileItem item) {
return item.getName().length() > 0;
}
/**
* This method is called when the {@link SizeLimitExceededException} was thrown. By default, add the key
* file.limit.exceeded using {@link Validations}.
*
* @param e
*/
protected void reportSizeLimitExceeded(final SizeLimitExceededException e) {
validator.checking(new Validations() {
{
that(false, "upload", "file.limit.exceeded", e.getActualSize(), e.getPermittedSize());
}
});
logger.warn("The file size limit was exceeded.", e);
}
protected void processFile(FileItem item, String name) {
try {
UploadedFile upload = new DefaultUploadedFile(item.getInputStream(), item.getName(), item.getContentType());
parameters.setParameter(name, name);
request.setAttribute(name, upload);
logger.debug("Uploaded file: {} with {}", name, upload);
} catch (IOException e) {
throw new InvalidParameterException("Cant parse uploaded file " + item.getName(), e);
}
}
protected FileItemFactory createFactoryForDiskBasedFileItems(File temporaryDirectory) {
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setRepository(temporaryDirectory);
logger.debug("Using repository {} for file upload", factory.getRepository());
return factory;
}
private String getValue(FileItem item) {
String encoding = request.getCharacterEncoding();
if (!Strings.isNullOrEmpty(encoding)) {
try {
return item.getString(encoding);
} catch (UnsupportedEncodingException e) {
logger.warn("Request have an invalid encoding. Ignoring it");
}
}
return item.getString();
}
}