package fineuploader;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.FileCleanerCleanup;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FileCleaningTracker;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.*;
public class MultipartUploadParser
{
final Logger log = LoggerFactory.getLogger(MultipartUploadParser.class);
private Map<String, String> params = new HashMap<String, String>();
private List<FileItem> files = new ArrayList<FileItem>();
// fileItemsFactory is a field (even though it's scoped to the constructor) to prevent the
// org.apache.commons.fileupload.servlet.FileCleanerCleanup thread from attempting to delete the
// temp file before while it is still being used.
//
// FileCleanerCleanup uses a java.lang.ref.ReferenceQueue to delete the temp file when the FileItemsFactory marker object is GCed
private DiskFileItemFactory fileItemsFactory;
public MultipartUploadParser(HttpServletRequest request, File repository, ServletContext context) throws Exception
{
if (!repository.exists() && !repository.mkdirs())
{
throw new IOException("Unable to mkdirs to " + repository.getAbsolutePath());
}
fileItemsFactory = setupFileItemFactory(repository, context);
ServletFileUpload upload = new ServletFileUpload(fileItemsFactory);
List<FileItem> formFileItems = upload.parseRequest(request);
parseFormFields(formFileItems);
if (files.isEmpty())
{
log.warn("No files were found when processing the requst. Debugging info follows.");
writeDebugInfo(request);
throw new FileUploadException("No files were found when processing the requst.");
}
else
{
if (log.isDebugEnabled())
{
writeDebugInfo(request);
}
}
}
private DiskFileItemFactory setupFileItemFactory(File repository, ServletContext context)
{
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(DiskFileItemFactory.DEFAULT_SIZE_THRESHOLD);
factory.setRepository(repository);
FileCleaningTracker pTracker = FileCleanerCleanup.getFileCleaningTracker(context);
factory.setFileCleaningTracker(pTracker);
return factory;
}
private void writeDebugInfo(HttpServletRequest request)
{
log.debug("-- POST HEADERS --");
for (String header : Collections.list(request.getHeaderNames()))
{
log.debug("{}: {}", header, request.getHeader(header));
}
log.debug("-- POST PARAMS --");
for (String key : params.keySet())
{
log.debug("{}: {}", key, params.get(key));
}
}
private void parseFormFields(List<FileItem> items)
{
for (FileItem item : items)
{
if (item.isFormField())
{
String key = item.getFieldName();
String value = item.getString();
if (StringUtils.isNotBlank(key))
{
params.put(key, StringUtils.defaultString(value));
}
}
else
{
files.add(item);
}
}
}
public Map<String, String> getParams()
{
return params;
}
public List<FileItem> getFiles()
{
if (files.isEmpty())
{
throw new RuntimeException("No FileItems exist.");
}
return files;
}
public FileItem getFirstFile()
{
if (files.isEmpty())
{
throw new RuntimeException("No FileItems exist.");
}
return files.iterator().next();
}
}