// ========================================================================
// Copyright 1996-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.mortbay.servlet;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.mortbay.util.LazyList;
import org.mortbay.util.MultiMap;
import org.mortbay.util.StringUtil;
import org.mortbay.util.TypeUtil;
/* ------------------------------------------------------------ */
/**
* Multipart Form Data Filter.
* <p>
* This class decodes the multipart/form-data stream sent by a HTML form that uses a file input
* item. Any files sent are stored to a tempary file and a File object added to the request
* as an attribute. All other values are made available via the normal getParameter API and
* the setCharacterEncoding mechanism is respected when converting bytes to Strings.
*
* If the init paramter "delete" is set to "true", any files created will be deleted when the
* current request returns.
*
* @author Greg Wilkins
* @author Jim Crossley
*/
public class MultiPartFilter implements Filter
{
private final static String FILES ="org.mortbay.servlet.MultiPartFilter.files";
private File tempdir;
private boolean _deleteFiles;
private ServletContext _context;
private int _fileOutputBuffer = 0;
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
*/
public void init(FilterConfig filterConfig) throws ServletException
{
tempdir=(File)filterConfig.getServletContext().getAttribute("javax.servlet.context.tempdir");
_deleteFiles="true".equals(filterConfig.getInitParameter("deleteFiles"));
String fileOutputBuffer = filterConfig.getInitParameter("fileOutputBuffer");
if(fileOutputBuffer!=null)
_fileOutputBuffer = Integer.parseInt(fileOutputBuffer);
_context=filterConfig.getServletContext();
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
* javax.servlet.ServletResponse, javax.servlet.FilterChain)
*/
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)
throws IOException, ServletException
{
HttpServletRequest srequest=(HttpServletRequest)request;
if(srequest.getContentType()==null||!srequest.getContentType().startsWith("multipart/form-data"))
{
chain.doFilter(request,response);
return;
}
BufferedInputStream in = new BufferedInputStream(request.getInputStream());
String content_type=srequest.getContentType();
// TODO - handle encodings
String boundary="--"+value(content_type.substring(content_type.indexOf("boundary=")));
byte[] byteBoundary=(boundary+"--").getBytes(StringUtil.__ISO_8859_1);
MultiMap params = new MultiMap();
for (Iterator i = request.getParameterMap().entrySet().iterator();i.hasNext();)
{
Map.Entry entry=(Map.Entry)i.next();
Object value=entry.getValue();
if (value instanceof String[])
params.addValues(entry.getKey(),(String[])value);
else
params.add(entry.getKey(),value);
}
try
{
// Get first boundary
byte[] bytes=TypeUtil.readLine(in);
String line=bytes==null?null:new String(bytes,"UTF-8");
if(line==null || !line.equals(boundary))
{
throw new IOException("Missing initial multi part boundary");
}
// Read each part
boolean lastPart=false;
String content_disposition=null;
while(!lastPart)
{
while(true)
{
bytes=TypeUtil.readLine(in);
// If blank line, end of part headers
if(bytes==null || bytes.length==0)
break;
line=new String(bytes,"UTF-8");
// place part header key and value in map
int c=line.indexOf(':',0);
if(c>0)
{
String key=line.substring(0,c).trim().toLowerCase();
String value=line.substring(c+1,line.length()).trim();
if(key.equals("content-disposition"))
content_disposition=value;
}
}
// Extract content-disposition
boolean form_data=false;
if(content_disposition==null)
{
throw new IOException("Missing content-disposition");
}
StringTokenizer tok=new StringTokenizer(content_disposition,";");
String name=null;
String filename=null;
while(tok.hasMoreTokens())
{
String t=tok.nextToken().trim();
String tl=t.toLowerCase();
if(t.startsWith("form-data"))
form_data=true;
else if(tl.startsWith("name="))
name=value(t);
else if(tl.startsWith("filename="))
filename=value(t);
}
// Check disposition
if(!form_data)
{
continue;
}
//It is valid for reset and submit buttons to have an empty name.
//If no name is supplied, the browser skips sending the info for that field.
//However, if you supply the empty string as the name, the browser sends the
//field, with name as the empty string. So, only continue this loop if we
//have not yet seen a name field.
if(name==null)
{
continue;
}
OutputStream out=null;
File file=null;
try
{
if (filename!=null && filename.length()>0)
{
file = File.createTempFile("MultiPart", "", tempdir);
out = new FileOutputStream(file);
if(_fileOutputBuffer>0)
out = new BufferedOutputStream(out, _fileOutputBuffer);
request.setAttribute(name,file);
params.add(name, filename);
if (_deleteFiles)
{
file.deleteOnExit();
ArrayList files = (ArrayList)request.getAttribute(FILES);
if (files==null)
{
files=new ArrayList();
request.setAttribute(FILES,files);
}
files.add(file);
}
}
else
out=new ByteArrayOutputStream();
int state=-2;
int c;
boolean cr=false;
boolean lf=false;
// loop for all lines`
while(true)
{
int b=0;
while((c=(state!=-2)?state:in.read())!=-1)
{
state=-2;
// look for CR and/or LF
if(c==13||c==10)
{
if(c==13)
state=in.read();
break;
}
// look for boundary
if(b>=0&&b<byteBoundary.length&&c==byteBoundary[b])
b++;
else
{
// this is not a boundary
if(cr)
out.write(13);
if(lf)
out.write(10);
cr=lf=false;
if(b>0)
out.write(byteBoundary,0,b);
b=-1;
out.write(c);
}
}
// check partial boundary
if((b>0&&b<byteBoundary.length-2)||(b==byteBoundary.length-1))
{
if(cr)
out.write(13);
if(lf)
out.write(10);
cr=lf=false;
out.write(byteBoundary,0,b);
b=-1;
}
// boundary match
if(b>0||c==-1)
{
if(b==byteBoundary.length)
lastPart=true;
if(state==10)
state=-2;
break;
}
// handle CR LF
if(cr)
out.write(13);
if(lf)
out.write(10);
cr=(c==13);
lf=(c==10||state==10);
if(state==10)
state=-2;
}
}
finally
{
out.close();
}
if (file==null)
{
bytes = ((ByteArrayOutputStream)out).toByteArray();
params.add(name,bytes);
}
}
// handle request
chain.doFilter(new Wrapper(srequest,params),response);
}
finally
{
deleteFiles(request);
}
}
private void deleteFiles(ServletRequest request)
{
ArrayList files = (ArrayList)request.getAttribute(FILES);
if (files!=null)
{
Iterator iter = files.iterator();
while (iter.hasNext())
{
File file=(File)iter.next();
try
{
file.delete();
}
catch(Exception e)
{
_context.log("failed to delete "+file,e);
}
}
}
}
/* ------------------------------------------------------------ */
private String value(String nameEqualsValue)
{
String value=nameEqualsValue.substring(nameEqualsValue.indexOf('=')+1).trim();
int i=value.indexOf(';');
if(i>0)
value=value.substring(0,i);
if(value.startsWith("\""))
{
value=value.substring(1,value.indexOf('"',1));
}
else
{
i=value.indexOf(' ');
if(i>0)
value=value.substring(0,i);
}
return value;
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.Filter#destroy()
*/
public void destroy()
{
}
private static class Wrapper extends HttpServletRequestWrapper
{
String encoding="UTF-8";
MultiMap map;
/* ------------------------------------------------------------------------------- */
/** Constructor.
* @param request
*/
public Wrapper(HttpServletRequest request, MultiMap map)
{
super(request);
this.map=map;
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.ServletRequest#getContentLength()
*/
public int getContentLength()
{
return 0;
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.ServletRequest#getParameter(java.lang.String)
*/
public String getParameter(String name)
{
Object o=map.get(name);
if (!(o instanceof byte[]) && LazyList.size(o)>0)
o=LazyList.get(o,0);
if (o instanceof byte[])
{
try
{
String s=new String((byte[])o,encoding);
return s;
}
catch(Exception e)
{
e.printStackTrace();
}
}
else if (o!=null)
return String.valueOf(o);
return null;
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.ServletRequest#getParameterMap()
*/
public Map getParameterMap()
{
return Collections.unmodifiableMap(map.toStringArrayMap());
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.ServletRequest#getParameterNames()
*/
public Enumeration getParameterNames()
{
return Collections.enumeration(map.keySet());
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.ServletRequest#getParameterValues(java.lang.String)
*/
public String[] getParameterValues(String name)
{
List l=map.getValues(name);
if (l==null || l.size()==0)
return new String[0];
String[] v = new String[l.size()];
for (int i=0;i<l.size();i++)
{
Object o=l.get(i);
if (o instanceof byte[])
{
try
{
v[i]=new String((byte[])o,encoding);
}
catch(Exception e)
{
e.printStackTrace();
}
}
else if (o instanceof String)
v[i]=(String)o;
}
return v;
}
/* ------------------------------------------------------------------------------- */
/**
* @see javax.servlet.ServletRequest#setCharacterEncoding(java.lang.String)
*/
public void setCharacterEncoding(String enc)
throws UnsupportedEncodingException
{
encoding=enc;
}
}
}