//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.util;
  
  import java.io.BufferedInputStream;
  import java.io.BufferedOutputStream;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.FilterInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.StandardCopyOption;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  import java.util.Locale;
  
  import javax.servlet.MultipartConfigElement;
  import javax.servlet.http.Part;
  
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  
  
  
  /**
   * MultiPartInputStream
   *
   * Handle a MultiPart Mime input stream, breaking it up on the boundary into files and strings.
   */
  public class MultiPartInputStreamParser
  {
      private static final Logger LOG = Log.getLogger(MultiPartInputStreamParser.class);
      public static final MultipartConfigElement  __DEFAULT_MULTIPART_CONFIG = new MultipartConfigElement(System.getProperty("java.io.tmpdir"));
      protected InputStream _in;
      protected MultipartConfigElement _config;
      protected String _contentType;
      protected MultiMap<Part> _parts;
      protected File _tmpDir;
      protected File _contextTmpDir;
      protected boolean _deleteOnExit;
  
  
  
      public class MultiPart implements Part
      {
          protected String _name;
          protected String _filename;
          protected File _file;
          protected OutputStream _out;
          protected ByteArrayOutputStream2 _bout;
          protected String _contentType;
          protected MultiMap<String> _headers;
          protected long _size = 0;
          protected boolean _temporary = true;
  
          public MultiPart (String name, String filename)
          throws IOException
          {
              _name = name;
              _filename = filename;
          }
  
          protected void setContentType (String contentType)
          {
              _contentType = contentType;
          }
  
  
          protected void open()
          throws IOException
          {
              //Write to a buffer in memory until we discover we've exceed the
              //MultipartConfig fileSizeThreshold
              _out = _bout= new ByteArrayOutputStream2();
         }
 
         protected void close()
         throws IOException
         {
             _out.close();
         }
 
 
         protected void write (int b)
         throws IOException
         {
             if (MultiPartInputStreamParser.this._config.getMaxFileSize() > 0 && _size + 1 > MultiPartInputStreamParser.this._config.getMaxFileSize())
                 throw new IllegalStateException ("Multipart Mime part "+_name+" exceeds max filesize");
 
             if (MultiPartInputStreamParser.this._config.getFileSizeThreshold() > 0 && _size + 1 > MultiPartInputStreamParser.this._config.getFileSizeThreshold() && _file==null)
                 createFile();
 
             _out.write(b);
             _size ++;
         }
 
         protected void write (byte[] bytes, int offset, int length)
         throws IOException
         {
             if (MultiPartInputStreamParser.this._config.getMaxFileSize() > 0 && _size + length > MultiPartInputStreamParser.this._config.getMaxFileSize())
                 throw new IllegalStateException ("Multipart Mime part "+_name+" exceeds max filesize");
 
             if (MultiPartInputStreamParser.this._config.getFileSizeThreshold() > 0 && _size + length > MultiPartInputStreamParser.this._config.getFileSizeThreshold() && _file==null)
                 createFile();
 
             _out.write(bytes, offset, length);
             _size += length;
         }
 
         protected void createFile ()
         throws IOException
         {
             _file = File.createTempFile("MultiPart", "", MultiPartInputStreamParser.this._tmpDir);
 
             if (_deleteOnExit)
                 _file.deleteOnExit();
             FileOutputStream fos = new FileOutputStream(_file);
             BufferedOutputStream bos = new BufferedOutputStream(fos);
 
             if (_size > 0 && _out != null)
             {
                 //already written some bytes, so need to copy them into the file
                 _out.flush();
                 _bout.writeTo(bos);
                 _out.close();
                 _bout = null;
             }
             _out = bos;
         }
 
 
 
         protected void setHeaders(MultiMap<String> headers)
         {
             _headers = headers;
         }
 
         /**
          * @see javax.servlet.http.Part#getContentType()
          */
         public String getContentType()
         {
             return _contentType;
         }
 
         /**
          * @see javax.servlet.http.Part#getHeader(java.lang.String)
          */
         public String getHeader(String name)
         {
             if (name == null)
                 return null;
             return _headers.getValue(name.toLowerCase(Locale.ENGLISH), 0);
         }
 
         /**
          * @see javax.servlet.http.Part#getHeaderNames()
          */
         public Collection<String> getHeaderNames()
         {
             return _headers.keySet();
         }
 
         /**
          * @see javax.servlet.http.Part#getHeaders(java.lang.String)
          */
         public Collection<String> getHeaders(String name)
         {
            return _headers.getValues(name);
         }
 
         /**
          * @see javax.servlet.http.Part#getInputStream()
          */
         public InputStream getInputStream() throws IOException
         {
            if (_file != null)
            {
                //written to a file, whether temporary or not
                return new BufferedInputStream (new FileInputStream(_file));
            }
            else
            {
                //part content is in memory
                return new ByteArrayInputStream(_bout.getBuf(),0,_bout.size());
            }
         }
 
 
         /**
          * @see javax.servlet.http.Part#getSubmittedFileName()
          */
         @Override
         public String getSubmittedFileName()
         {
             return getContentDispositionFilename();
         }
 
         public byte[] getBytes()
         {
             if (_bout!=null)
                 return _bout.toByteArray();
             return null;
         }
 
         /**
          * @see javax.servlet.http.Part#getName()
          */
         public String getName()
         {
            return _name;
         }
 
         /**
          * @see javax.servlet.http.Part#getSize()
          */
         public long getSize()
         {
             return _size;
         }
 
         /**
          * @see javax.servlet.http.Part#write(java.lang.String)
          */
         public void write(String fileName) throws IOException
         {
             if (_file == null)
             {
                 _temporary = false;
 
                 //part data is only in the ByteArrayOutputStream and never been written to disk
                 _file = new File (_tmpDir, fileName);
 
                 BufferedOutputStream bos = null;
                 try
                 {
                     bos = new BufferedOutputStream(new FileOutputStream(_file));
                     _bout.writeTo(bos);
                     bos.flush();
                 }
                 finally
                 {
                     if (bos != null)
                         bos.close();
                     _bout = null;
                 }
             }
             else
             {
                 //the part data is already written to a temporary file, just rename it
                 _temporary = false;
 
                 Path src = _file.toPath();
                 Path target = src.resolveSibling(fileName);
                 Files.move(src, target, StandardCopyOption.REPLACE_EXISTING);
                 _file = target.toFile();
             }
         }
 
         /**
          * Remove the file, whether or not Part.write() was called on it
          * (ie no longer temporary)
          * @see javax.servlet.http.Part#delete()
          */
         public void delete() throws IOException
         {
             if (_file != null && _file.exists())
                 _file.delete();
         }
 
         /**
          * Only remove tmp files.
          *
          * @throws IOException if unable to delete the file
          */
         public void cleanUp() throws IOException
         {
             if (_temporary && _file != null && _file.exists())
                 _file.delete();
         }
 
 
         /**
          * Get the file
          * @return the file, if any, the data has been written to.
          */
         public File getFile ()
         {
             return _file;
         }
 
 
         /**
          * Get the filename from the content-disposition.
          * @return null or the filename
          */
         public String getContentDispositionFilename ()
         {
             return _filename;
         }
     }
 
 
 
 
     /**
      * @param in Request input stream
      * @param contentType Content-Type header
      * @param config MultipartConfigElement
      * @param contextTmpDir javax.servlet.context.tempdir
      */
     public MultiPartInputStreamParser (InputStream in, String contentType, MultipartConfigElement config, File contextTmpDir)
     {
         _in = new ReadLineInputStream(in);
        _contentType = contentType;
        _config = config;
        _contextTmpDir = contextTmpDir;
        if (_contextTmpDir == null)
            _contextTmpDir = new File (System.getProperty("java.io.tmpdir"));
 
        if (_config == null)
            _config = new MultipartConfigElement(_contextTmpDir.getAbsolutePath());
     }
 
     /**
      * Get the already parsed parts.
      * @return the parts that were parsed
      */
     public Collection<Part> getParsedParts()
     {
         if (_parts == null)
             return Collections.emptyList();
 
         Collection<List<Part>> values = _parts.values();
         List<Part> parts = new ArrayList<>();
         for (List<Part> o: values)
         {
             List<Part> asList = LazyList.getList(o, false);
             parts.addAll(asList);
         }
         return parts;
     }
 
     /**
      * Delete any tmp storage for parts, and clear out the parts list.
      *
      * @throws MultiException if unable to delete the parts
      */
     public void deleteParts ()
     throws MultiException
     {
         Collection<Part> parts = getParsedParts();
         MultiException err = new MultiException();
         for (Part p:parts)
         {
             try
             {
                 ((MultiPartInputStreamParser.MultiPart)p).cleanUp();
             }
             catch(Exception e)
             {
                 err.add(e);
             }
         }
         _parts.clear();
 
         err.ifExceptionThrowMulti();
     }
 
 
     /**
      * Parse, if necessary, the multipart data and return the list of Parts.
      *
      * @return the parts
      * @throws IOException if unable to get the parts
      */
     public Collection<Part> getParts()
     throws IOException
     {
         parse();
         Collection<List<Part>> values = _parts.values();
         List<Part> parts = new ArrayList<>();
         for (List<Part> o: values)
         {
             List<Part> asList = LazyList.getList(o, false);
             parts.addAll(asList);
         }
         return parts;
     }
 
 
     /**
      * Get the named Part.
      *
      * @param name the part name
      * @return the parts
      * @throws IOException if unable to get the part
      */
     public Part getPart(String name)
     throws IOException
     {
         parse();
         return _parts.getValue(name, 0);
     }
 
 
     /**
      * Parse, if necessary, the multipart stream.
      *
      * @throws IOException if unable to parse
      */
     protected void parse ()
     throws IOException
     {
         //have we already parsed the input?
         if (_parts != null)
             return;
 
         //initialize
         long total = 0; //keep running total of size of bytes read from input and throw an exception if exceeds MultipartConfigElement._maxRequestSize
         _parts = new MultiMap<>();
 
         //if its not a multipart request, don't parse it
         if (_contentType == null || !_contentType.startsWith("multipart/form-data"))
             return;
 
         //sort out the location to which to write the files
 
         if (_config.getLocation() == null)
             _tmpDir = _contextTmpDir;
         else if ("".equals(_config.getLocation()))
             _tmpDir = _contextTmpDir;
         else
         {
             File f = new File (_config.getLocation());
             if (f.isAbsolute())
                 _tmpDir = f;
             else
                 _tmpDir = new File (_contextTmpDir, _config.getLocation());
         }
 
         if (!_tmpDir.exists())
             _tmpDir.mkdirs();
 
         String contentTypeBoundary = "";
         int bstart = _contentType.indexOf("boundary=");
         if (bstart >= 0)
         {
             int bend = _contentType.indexOf(";", bstart);
             bend = (bend < 0? _contentType.length(): bend);
             contentTypeBoundary = QuotedStringTokenizer.unquote(value(_contentType.substring(bstart,bend)).trim());
         }
 
         String boundary="--"+contentTypeBoundary;
         String lastBoundary=boundary+"--";
         byte[] byteBoundary=lastBoundary.getBytes(StandardCharsets.ISO_8859_1);
 
         // Get first boundary
         String line = null;
         try
         {
             line=((ReadLineInputStream)_in).readLine();
         }
         catch (IOException e)
         {
             LOG.warn("Badly formatted multipart request");
             throw e;
         }
 
         if (line == null)
             throw new IOException("Missing content for multipart request");
 
         boolean badFormatLogged = false;
         line=line.trim();
         while (line != null && !line.equals(boundary) && !line.equals(lastBoundary))
         {
             if (!badFormatLogged)
             {
                 LOG.warn("Badly formatted multipart request");
                 badFormatLogged = true;
             }
             line=((ReadLineInputStream)_in).readLine();
             line=(line==null?line:line.trim());
         }
 
         if (line == null)
             throw new IOException("Missing initial multi part boundary");
 
         // Empty multipart.
         if (line.equals(lastBoundary))
             return;
 
         // Read each part
         boolean lastPart=false;
 
         outer:while(!lastPart)
         {
             String contentDisposition=null;
             String contentType=null;
             String contentTransferEncoding=null;
 
             MultiMap<String> headers = new MultiMap<>();
             while(true)
             {
                 line=((ReadLineInputStream)_in).readLine();
 
                 //No more input
                 if(line==null)
                     break outer;
 
                 //end of headers:
                 if("".equals(line))
                     break;
 
                 total += line.length();
                 if (_config.getMaxRequestSize() > 0 && total > _config.getMaxRequestSize())
                     throw new IllegalStateException ("Request exceeds maxRequestSize ("+_config.getMaxRequestSize()+")");
 
                 //get content-disposition and content-type
                 int c=line.indexOf(':',0);
                 if(c>0)
                 {
                     String key=line.substring(0,c).trim().toLowerCase(Locale.ENGLISH);
                     String value=line.substring(c+1,line.length()).trim();
                     headers.put(key, value);
                     if (key.equalsIgnoreCase("content-disposition"))
                         contentDisposition=value;
                     if (key.equalsIgnoreCase("content-type"))
                         contentType = value;
                     if(key.equals("content-transfer-encoding"))
                         contentTransferEncoding=value;
                 }
             }
 
             // Extract content-disposition
             boolean form_data=false;
             if(contentDisposition==null)
             {
                 throw new IOException("Missing content-disposition");
             }
 
             QuotedStringTokenizer tok=new QuotedStringTokenizer(contentDisposition,";", false, true);
             String name=null;
             String filename=null;
             while(tok.hasMoreTokens())
             {
                 String t=tok.nextToken().trim();
                 String tl=t.toLowerCase(Locale.ENGLISH);
                 if(t.startsWith("form-data"))
                     form_data=true;
                 else if(tl.startsWith("name="))
                     name=value(t);
                 else if(tl.startsWith("filename="))
                     filename=filenameValue(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;
             }
 
             //Have a new Part
             MultiPart part = new MultiPart(name, filename);
             part.setHeaders(headers);
             part.setContentType(contentType);
             _parts.add(name, part);
             part.open();
 
             InputStream partInput = null;
             if ("base64".equalsIgnoreCase(contentTransferEncoding))
             {
                 partInput = new Base64InputStream((ReadLineInputStream)_in);
             }
             else if ("quoted-printable".equalsIgnoreCase(contentTransferEncoding))
             {
                 partInput = new FilterInputStream(_in)
                 {
                     @Override
                     public int read() throws IOException
                     {
                         int c = in.read();
                         if (c >= 0 && c == '=')
                         {
                             int hi = in.read();
                             int lo = in.read();
                             if (hi < 0 || lo < 0)
                             {
                                 throw new IOException("Unexpected end to quoted-printable byte");
                             }
                             char[] chars = new char[] { (char)hi, (char)lo };
                             c = Integer.parseInt(new String(chars),16);
                         }
                         return c;
                     }
                 };
             }
             else
                 partInput = _in;
 
 
             try
             {
                 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:partInput.read())!=-1)
                     {
                         total ++;
                         if (_config.getMaxRequestSize() > 0 && total > _config.getMaxRequestSize())
                             throw new IllegalStateException("Request exceeds maxRequestSize ("+_config.getMaxRequestSize()+")");
 
                         state=-2;
 
                         // look for CR and/or LF
                         if(c==13||c==10)
                         {
                             if(c==13)
                             {
                                 partInput.mark(1);
                                 int tmp=partInput.read();
                                 if (tmp!=10)
                                     partInput.reset();
                                 else
                                     state=tmp;
                             }
                             break;
                         }
 
                         // Look for boundary
                         if(b>=0&&b<byteBoundary.length&&c==byteBoundary[b])
                         {
                             b++;
                         }
                         else
                         {
                             // Got a character not part of the boundary, so we don't have the boundary marker.
                             // Write out as many chars as we matched, then the char we're looking at.
                             if(cr)
                                 part.write(13);
 
                             if(lf)
                                 part.write(10);
 
                             cr=lf=false;
                             if(b>0)
                                 part.write(byteBoundary,0,b);
 
                             b=-1;
                             part.write(c);
                         }
                     }
 
                     // Check for incomplete boundary match, writing out the chars we matched along the way
                     if((b>0&&b<byteBoundary.length-2)||(b==byteBoundary.length-1))
                     {
                         if(cr)
                             part.write(13);
 
                         if(lf)
                             part.write(10);
 
                         cr=lf=false;
                         part.write(byteBoundary,0,b);
                         b=-1;
                     }
 
                     // Boundary match. If we've run out of input or we matched the entire final boundary marker, then this is the last part.
                     if(b>0||c==-1)
                     {
 
                         if(b==byteBoundary.length)
                             lastPart=true;
                         if(state==10)
                             state=-2;
                         break;
                     }
 
                     // handle CR LF
                     if(cr)
                         part.write(13);
 
                     if(lf)
                         part.write(10);
 
                     cr=(c==13);
                     lf=(c==10||state==10);
                     if(state==10)
                         state=-2;
                 }
             }
             finally
             {
 
                 part.close();
             }
         }
         if (!lastPart)
             throw new IOException("Incomplete parts");
     }
 
     public void setDeleteOnExit(boolean deleteOnExit)
     {
         _deleteOnExit = deleteOnExit;
     }
 
 
     public boolean isDeleteOnExit()
     {
         return _deleteOnExit;
     }
 
 
     /* ------------------------------------------------------------ */
     private String value(String nameEqualsValue)
     {
         int idx = nameEqualsValue.indexOf('=');
         String value = nameEqualsValue.substring(idx+1).trim();
         return QuotedStringTokenizer.unquoteOnly(value);
     }
 
 
     /* ------------------------------------------------------------ */
     private String filenameValue(String nameEqualsValue)
     {
         int idx = nameEqualsValue.indexOf('=');
         String value = nameEqualsValue.substring(idx+1).trim();
 
         if (value.matches(".??[a-z,A-Z]\\:\\\\[^\\\\].*"))
         {
             //incorrectly escaped IE filenames that have the whole path
             //we just strip any leading & trailing quotes and leave it as is
             char first=value.charAt(0);
             if (first=='"' || first=='\'')
                 value=value.substring(1);
             char last=value.charAt(value.length()-1);
             if (last=='"' || last=='\'')
                 value = value.substring(0,value.length()-1);
 
             return value;
         }
         else
             //unquote the string, but allow any backslashes that don't
             //form a valid escape sequence to remain as many browsers
             //even on *nix systems will not escape a filename containing
             //backslashes
             return QuotedStringTokenizer.unquoteOnly(value, true);
     }
 
 
 
     private static class Base64InputStream extends InputStream
     {
         ReadLineInputStream _in;
         String _line;
         byte[] _buffer;
         int _pos;
 
 
         public Base64InputStream(ReadLineInputStream rlis)
         {
             _in = rlis;
         }
 
         @Override
         public int read() throws IOException
         {
             if (_buffer==null || _pos>= _buffer.length)
             {
                 //Any CR and LF will be consumed by the readLine() call.
                 //We need to put them back into the bytes returned from this
                 //method because the parsing of the multipart content uses them
                 //as markers to determine when we've reached the end of a part.
                 _line = _in.readLine();
                 if (_line==null)
                     return -1;  //nothing left
                 if (_line.startsWith("--"))
                     _buffer=(_line+"\r\n").getBytes(); //boundary marking end of part
                 else if (_line.length()==0)
                     _buffer="\r\n".getBytes(); //blank line
                 else
                 {
                     ByteArrayOutputStream baos = new ByteArrayOutputStream((4*_line.length()/3)+2);
                     B64Code.decode(_line, baos);
                     baos.write(13);
                     baos.write(10);
                     _buffer = baos.toByteArray();
                 }
 
                 _pos=0;
             }
 
             return _buffer[_pos++];
         }
     }
 }