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The core jetty server artifact.
There is a newer version: 12.0.13
//
//  ========================================================================
//  Copyright (c) 1995-2019 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.server;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumSet;
import java.util.List;

import javax.servlet.MultipartConfigElement;
import javax.servlet.http.Part;

import org.eclipse.jetty.http.HttpCompliance;
import org.eclipse.jetty.http.MultiPartFormInputStream;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.ContextHandler.Context;
import org.eclipse.jetty.util.MultiPartInputStreamParser;
import org.eclipse.jetty.util.MultiPartInputStreamParser.NonCompliance;


/*
 * Used to switch between the old and new implementation of MultiPart Form InputStream Parsing.
 * The new implementation is preferred will be used as default unless specified otherwise constructor.
 */
public interface MultiParts extends Closeable
{   
    public Collection getParts();
    public Part getPart(String name);
    public boolean isEmpty();
    public ContextHandler.Context getContext();
    
    
    public class MultiPartsHttpParser implements MultiParts
    {   
        private final MultiPartFormInputStream _httpParser;
        private final ContextHandler.Context _context;

        public MultiPartsHttpParser(InputStream in, String contentType, MultipartConfigElement config, File contextTmpDir, Request request) throws IOException
        {
            _httpParser = new MultiPartFormInputStream(in, contentType, config, contextTmpDir);
            _context = request.getContext();
            _httpParser.getParts();
        }

        @Override
        public Collection getParts() 
        {
            try
            {
                return _httpParser.getParts();
            }
            catch (IOException e)
            {
                throw new RuntimeException(e);
            }
        }

        @Override
        public Part getPart(String name) {
            try
            {
                return _httpParser.getPart(name);
            }
            catch (IOException e)
            {
                throw new RuntimeException(e);
            }
        }

        @Override
        public void close()
        {
            _httpParser.deleteParts();
        }

        @Override
        public boolean isEmpty()
        {
            return _httpParser.isEmpty();
        }

        @Override
        public Context getContext()
        {
            return _context;
        }

    }
    
    
    @SuppressWarnings("deprecation") 
    public class MultiPartsUtilParser implements MultiParts
    {   
        private final MultiPartInputStreamParser _utilParser;
        private final ContextHandler.Context _context;

        public MultiPartsUtilParser(InputStream in, String contentType, MultipartConfigElement config, File contextTmpDir, Request request) throws IOException
        {
            _utilParser = new MultiPartInputStreamParser(in, contentType, config, contextTmpDir);
            _context = request.getContext();
            _utilParser.getParts();

            EnumSet nonComplianceWarnings = _utilParser.getNonComplianceWarnings();
            if (!nonComplianceWarnings.isEmpty())
            {
                @SuppressWarnings("unchecked")
                List violations = (List)request.getAttribute(HttpCompliance.VIOLATIONS_ATTR);
                if (violations==null)
                {
                    violations = new ArrayList<>();
                    request.setAttribute(HttpCompliance.VIOLATIONS_ATTR,violations);
                }

                for(NonCompliance nc : nonComplianceWarnings)
                    violations.add(nc.name()+": "+nc.getURL());
            }
        }

        @Override
        public Collection getParts()
        {
            try
            {
                return _utilParser.getParts();
            }
            catch (IOException e)
            {
                throw new RuntimeException(e);
            }
        }

        @Override
        public Part getPart(String name)
        {
            try
            {
                return _utilParser.getPart(name);
            }
            catch (IOException e)
            {
                throw new RuntimeException(e);
            }
        }

        @Override
        public void close()
        {
            _utilParser.deleteParts();
        }

        @Override
        public boolean isEmpty()
        {
            return _utilParser.getParsedParts().isEmpty();
        }

        @Override
        public Context getContext()
        {
            return _context;
        }
    }
}